CN213184178U - Contact mechanism and switching device - Google Patents

Abstract

A contact mechanism and switching device, the contact mechanism includes a Y-shaped moving contact, and the static contact that the first static contact and second static contact make up; the moving contact comprises two moving contact arms and a moving contact connecting arm, the first fixed contact is a U-shaped structure capable of reversing current, and comprises a first static contact plate and a first static connecting plate, the first static contact plate is used for being matched with the moving contact, and the first static connecting plate is connected with the first static contact plate; two moving contact arms cooperate with the first static contact board and the second static contact of first static contact respectively, the current direction that flows through first static contact board when making the closure is opposite with the current direction who flows through one moving contact arm with first static contact board complex, the current direction that flows through the second static contact is opposite with the current direction who flows through another moving contact arm with second static contact complex, the double break point structure promotes disconnected section ability, and accelerates disconnected section speed with the help of the mutual repulsion between the sound contact, switching apparatus includes the utility model discloses a contact mechanism.

Description

Contact mechanism and switching device

Technical Field

The utility model relates to a low-voltage apparatus field relates to a switching apparatus.

Background

A dc circuit breaker is a switching device capable of carrying and breaking a current under a normal circuit condition and also capable of carrying and breaking a current under an abnormal circuit condition within a predetermined time. The breaker breaks overload or short-circuit current, and is realized in an arc extinguishing chamber of the breaker. When fault current occurs in the circuit and the current value exceeds the set protection range of the circuit breaker, the tripping mechanism acts to quickly disconnect the moving contact and the fixed contact of the circuit breaker. At this time, the voltage formed between the moving and stationary contacts discharges the air dielectric, thereby generating a high-temperature arc. During the burning of the arc, the temperature of the air in the arc extinguishing device rises sharply, thereby accelerating the ionization of the air. On the other hand, the electric arc is divided into a plurality of short arcs by a plurality of arc isolating grid pieces under the pushing of the magnetic field and the fluid effect in the arc extinguish chamber, and the deionization effect of the electric arc is enhanced by the metal arc isolating pieces, so that the electric arc is gradually reduced until the electric arc is extinguished.

However, these current arc extinguishing means can only solve the arc generated by low voltage, and the arc extinguishing capability of a single-pole single chamber is slightly insufficient for the arc generated by high voltage.

In addition, the traditional single-pole single-breakpoint contact mechanism can meet the breaking requirement only under a certain working voltage, and when the working voltage is very high, the traditional single-pole single-breakpoint contact mechanism cannot meet the breaking requirement.

Disclosure of Invention

An object of the utility model is to overcome prior art's defect, provide a contact mechanism of two breakpoints.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

a contact mechanism comprises a Y-shaped moving contact, a first static contact and a second static contact, wherein the static contact is composed of the first static contact and the second static contact; the first static contact is of a U-shaped structure capable of reversing current, and comprises a first static contact plate and a first static connection plate, wherein the first static contact plate is used for being matched with the moving contact, the first static connection plate is connected with the first static contact plate, one end, connected with the first static connection plate, of the first static contact plate is bent reversely, so that the end part of the other end of the first static contact plate is located on one side of the first static connection plate to form the U-shaped structure, and the direction of the current flowing through the first static connection plate is opposite to the direction of the current flowing through the first static contact; the two moving contact arms are respectively matched with a first static contact plate and a second static contact of the first static contact, so that the direction of current flowing through the first static contact plate is opposite to the direction of current flowing through one moving contact arm matched with the first static contact plate when the fixed contact is closed, and the direction of current flowing through the second static contact is opposite to the direction of current flowing through the other moving contact arm matched with the second static contact.

Preferably, the first fixed contact and the second fixed contact are arranged side by side at the ends matched with the moving contact, and are arranged corresponding to one ends of two moving contact arms of the moving contact; the other ends of the first static contact and the second static contact extend towards opposite directions respectively, and one end of the moving contact, which is provided with a moving contact connecting arm, extends towards the same direction as the second static contact.

Preferably, the first fixed contact, the second fixed contact and one end of the movable contact, which are matched with each other, are respectively provided with a fixed contact, the other ends of the first fixed contact and the second fixed contact extend in opposite directions and are respectively and electrically connected with the second wiring terminal and the first wiring terminal at two ends of the circuit breaker, one of the second wiring terminal and the first wiring terminal is a wire inlet terminal, and the other one of the second wiring terminal and the first wiring terminal is a wire outlet terminal.

Preferably, one end of each of the two moving contact arms of the moving contact, which is matched with the first fixed contact and the second fixed contact, is provided with a moving contact, a moving contact connecting arm of the moving contact is used for being connected with the operating mechanism, and one end of the moving contact connecting arm, which is used for being connected with the operating mechanism, is provided with a moving contact insulating sleeve.

Preferably, still include and be used for the static contact insulating boot with first static contact and the second static contact of the second of the family of a second is separated.

Preferably, the movable contact is composed of two Z-shaped movable contact pieces, each Z-shaped movable contact piece is composed of a first parallel section, a bending section and a second parallel section which are connected in sequence, the side faces of the first parallel sections of the two Z-shaped movable contact pieces are tightly attached to form a movable contact connecting arm, the bending sections of the two Z-shaped movable contact pieces bend and extend towards opposite directions to enable the second parallel sections of the two Z-shaped movable contact pieces to be arranged at intervals, the bending sections and the second parallel sections of the two Z-shaped movable contact pieces form two movable contact arms, one end of each second parallel section bends towards the side edge direction of one side, and the end part of each second parallel section is provided with a movable contact.

Preferably, a static contact is arranged at one end of the first static contact plate, and the first static contact plate is reversely bent beyond the excessive bending, so that the first static contact plate is inclined relative to the first static connection plate.

Preferably, the first fixed contact is integrally formed and formed by bending a sheet-shaped first contact plate, the front section of the first contact plate is reversely bent to form a first fixed contact plate, the middle section of the first contact plate forms a first fixed connecting plate, the tail section of the first contact plate forms a second wiring end for wiring, and the second wiring end and the first fixed connecting plate are bent to form a staggered step.

Preferably, the second static contact comprises a second static contact plate used for being matched with the moving contact, and a second static connection plate connected with the second static contact plate, one end of the second static contact plate is connected with the second static connection plate, and the other end of the second static contact plate extends towards the direction far away from the second static connection plate, so that the current direction flowing through the second static connection plate is the same as the current direction flowing through the second static contact plate, the end, connected with the second static contact plate, of the second static connection plate is bent upwards to be connected with the second static contact plate, and the end, provided with the static contact, of the second static contact plate, is bent downwards to enable the static contact to be inclined.

Preferably, the bottom of the static contact insulating cover is open, an insulating partition is arranged in the static contact insulating cover to partition the static contact insulating cover into two cavities, the two cavities are respectively a first cavity matched with the second static contact and a second cavity matched with the first static contact, a first inlet for the second static contact to extend into is formed in the position, corresponding to the first cavity, of the side wall at one end of the static contact insulating cover, a second inlet for the first static contact to extend into is formed in the position, corresponding to the second cavity, of the side wall at the other end of the static contact insulating cover, and a first mounting hole and a second mounting hole for the static contact of the second static contact and the static contact of the first static contact to extend out are respectively formed in the top of the static contact insulating cover, corresponding to the first cavity and the second cavity.

Preferably, the static contact insulating cover further covers a first static connecting plate of the first static contact, the first static connecting plate is connected with the second wiring terminal, an insulating side wall for isolating the second wiring terminal extends upwards from one end of the static contact insulating cover provided with the second inlet, and a U-shaped groove for installing an arc extinguish chamber is formed in the static contact insulating cover.

The utility model also provides a switching device, including contact system and arc extinguishing system, the contact system includes an at least polar contact mechanism of above-mentioned scheme.

Preferably, the arc extinguishing system includes the explosion chamber that corresponds the setting with contact mechanism, the explosion chamber is equipped with two separated arc extinguishing chamber.

Preferably, a plurality of arc extinguishing bars arranged in a stacked mode at intervals are arranged in the arc extinguishing chamber, two arc extinguishing gaps arranged at intervals are formed in one end of each arc extinguishing bar to form a W-shaped gap, and two arc extinguishing gaps of the plurality of arc extinguishing bars arranged in a stacked mode at intervals form two arc extinguishing cavities which are used for being matched with two movable contacts of the Y-shaped movable contact respectively.

Preferably, the arc extinguishing chamber shell of the arc extinguishing chamber is divided into two cavities by a partition plate, and each cavity is internally provided with a plurality of arc extinguishing grid pieces which are arranged in a spaced and stacked mode to form two arc extinguishing chambers; at least one permanent magnet is arranged on the two sides of each arc extinguishing chamber, and/or a permanent magnet is arranged on the top of each arc extinguishing chamber.

The utility model discloses a contact mechanism adopts the double break point structure to promote high voltage breaking capacity, adopts the moving contact of Y type simultaneously, can make the reverse U type structure of electric current and the not reverse first static contact board of electric current, reaches the effect of moving, static contact repulsion each other, when the circuit breaker meets the fault current separating brake, can move when the circuit breaker divides the branch with the help of the circuit breaker, the separating speed of circuit breaker is accelerated to the mutual repulsion between the static contact, promotes the breaking capacity of circuit breaker.

In addition, the contact mechanism sets up the static contact insulating boot for separate first static contact and two second static contacts, improve the security.

The utility model discloses a switching apparatus, based on the utility model discloses an explosion chamber of contact mechanism and monopole two-chamber has promoted the disconnected ability of arc extinguishing of high voltage of circuit breaker greatly.

Drawings

Fig. 1 is a schematic structural diagram of an embodiment of the circuit breaker of the present invention;

figure 2 is a schematic structural view of an embodiment of the contact system of the present invention;

fig. 3 is a schematic diagram of the arc extinguish chamber and the moving contact according to the present invention;

fig. 4 is a schematic layout diagram of an embodiment of the first stationary contact and the second stationary contact of the present invention;

fig. 5 is a schematic structural view of the insulating cover of the static contact of the present invention;

fig. 6 is an assembly schematic view of the first fixed contact, the second fixed contact and the fixed contact insulating cover of the present invention;

fig. 7 is a schematic current flow diagram of the first fixed contact and the movable contact according to the present invention;

fig. 8 is a schematic current flow diagram of the second fixed contact and the movable contact according to the present invention;

fig. 9-10 are exploded views of the arc chute of the present invention;

fig. 11 is a schematic view of another angle of the arc chute housing of the present invention;

fig. 12 is a schematic view of another angle of the arc chute frame of the present invention.

Detailed Description

The following provides an example with reference to the accompanying drawings, further explaining a specific embodiment of the contact system and the arc extinguishing system of the present invention. The contact system and the arc extinguishing system of the present invention are not limited to the description of the following embodiments.

As shown in fig. 1-3, an embodiment of a circuit breaker includes a handle 11, an operating mechanism 12, a contact system, an arc extinguishing system, a trip system 15, a first terminal 16, and a second terminal 17. The contact system comprises at least one contact mechanism, each contact mechanism comprises a group of moving contacts 2 and static contacts which are matched with each other, a handle 11 is connected with an operating mechanism 12, the moving contacts 2 are connected with the operating mechanism 12 through contact supports 13, the moving contacts 2 and the static contacts are arranged oppositely, the handle 11 drives the moving contacts 2 to move to be in contact with and separated from the static contacts through the operating mechanism 12 to realize the switching-on and switching-off of the circuit breaker, an arc extinguishing system is arranged opposite to the moving contacts 2 and the static contacts and is used for extinguishing electric arcs when the moving contacts and the static contacts are separated, and a tripping system 15 acts to drive the operating mechanism 12 to trip when. The circuit breaker shown in the figures comprises a two-pole contact mechanism, although the circuit breaker may be provided with only a single-pole contact mechanism, or with three, four or more poles, as desired. The conventional trip system 15 is a thermal trip including a bimetallic strip for overload protection and an instantaneous trip including an electromagnetic mechanism for short-circuit protection, and the trip system 15 is a trip system 15 integrating the thermal trip and the instantaneous trip in the drawing, which is prior art in the field and will not be described in detail. The utility model discloses a switching apparatus uses the circuit breaker as the embodiment, of course the utility model discloses modified explosion chamber and contact mechanism also are applicable to other types of switching apparatus.

As shown in fig. 2-8, the utility model discloses an improvement point, every utmost point contact mechanism includes the moving contact 2 of a Y type to and a first static contact 4 and the static contact of two second static contacts 3 constitutions, the one end interval of the moving contact 2 of Y type sets up and is used for respectively cooperating with first static contact 4 and second static contact 3, constitutes a monopole double break point contact mechanism, can be applicable to the alternating current-direct current system.

The moving contact 2 comprises two moving contact arms 21 and a moving contact connecting arm 22, one end of each of the two moving contact arms 21 is connected with one end of the moving contact connecting arm 22, and the other ends of the two moving contact arms 21 are arranged at intervals to form a Y-shaped moving contact 2. The two moving contact arms 21 are respectively matched with the first fixed contact 4 and the second fixed contact 3, when one ends of the two moving contact arms 21 are respectively contacted with the first fixed contact 4 and the second fixed contact 3, the contact mechanism is closed to conduct a power supply, and when one ends of the two moving contact arms 21 are respectively separated from the first fixed contact 4 and the second fixed contact 3, the contact mechanism is disconnected to disconnect the power supply.

The first fixed contact 4 is a U-shaped structure capable of reversing current, and the second fixed contact 3 is a flat plate structure not reversing current. The first static contact 4 includes a first static contact plate 41 for cooperating with the moving contact 2, and a first static connection plate 42 connected to the first static contact plate 41, wherein one end of the first static contact plate 41 connected to the first static connection plate 42 is bent in a reverse direction so that an end of the other end of the first static contact plate 41 is located on one side of the first static connection plate 42 to form a U-shaped structure, so that a current flowing through the first static connection plate 42 is opposite to a current flowing through the first static contact plate 41.

The two movable contact arms 21 are respectively matched with the first fixed contact plate 41 and the second fixed contact 3 of the first fixed contact 4, so that the direction of current flowing through the first fixed contact plate 41 is opposite to the direction of current flowing through one movable contact arm 21 matched with the first fixed contact plate 41 when the movable contact is closed, and the direction of current flowing through the second fixed contact 3 is opposite to the direction of current flowing through the other movable contact arm 21 matched with the second fixed contact 3.

Double breakpoint contact mechanism, adopt double breakpoint structure to promote high voltage breaking capacity, adopt the moving contact of Y type simultaneously, can make the reverse U type structure of electric current and the not reverse first static contact board 41 of electric current, reach and move, the effect that the static contact repels each other, no matter main loop current is from first static contact 4 inflow, second static contact 3 flows out, still flow in from second static contact 3, first static contact 4 flows out, can both reach and move, the effect that the static contact repels each other, when the circuit breaker runs into the fault current separating brake, can move when breaking with the help of the circuit breaker, the separating speed of circuit breaker is accelerated to the repulsive force between the static contact, promote the breaking capacity of circuit breaker.

As shown in fig. 2-4, the first fixed contact 4 and the second fixed contact 3 are arranged side by side at one end of the movable contact 2, and are arranged corresponding to one end of two movable contact arms 21 of the movable contact 2; the other ends of the first fixed contact 4 and the second fixed contact 3 extend in opposite directions, and the end of the movable contact 2 provided with the movable contact connecting arm 22 extends in the same direction as the second fixed contact 3. Specifically, the first fixed contact 4, the second fixed contact 3 and the movable contact 2 are respectively provided with a fixed contact at one end, the other ends of the fixed contacts extend in opposite directions and are respectively electrically connected with the second terminal 17 and the first terminal 16 at two ends of the circuit breaker, one of the second terminal 17 and the first terminal 16 is an incoming line end, the other one is an outgoing line end, and the two terminals can be interchanged, wherein the incoming line end is connected with a power supply, and the outgoing line end is usually connected with a load. Two moving contact arms 21 of the moving contact 2 are respectively and correspondingly provided with a moving contact, a moving contact connecting arm 22 of the moving contact 2 is connected with an operating mechanism, and the two moving contacts of the moving contact 2 are respectively matched with two static contacts of the first static contact 4 and the second static contact 3 under the driving of the operating mechanism, so that the opening and closing of the circuit breaker are realized.

As shown in fig. 2-3, the Y-shaped movable contact 2 includes two movable contact arms 21 and a movable contact connecting arm 22, one end of each of the two movable contact arms 21 is connected to one end of the movable contact connecting arm 22, the other ends of the two movable contact arms 21 are spaced apart and provided with movable contacts for cooperating with stationary contacts of the first stationary contact 4 and the second stationary contact 3, and the two movable contact arms 21 form a V-shape, a U-shape, or the like. Preferably, one end of the movable contact arm 21, which is matched with the fixed contact, is bent and extended towards one side close to the fixed contact, and the end part is provided with a movable contact. The other end of the moving contact connecting arm 22 is used for connecting with the contact support 13, and the moving contact connecting arm 22 is in an I-shaped linear structure. It should be noted that the Y type structure of moving contact 2 refers to a similar shape structure, and mainly indicate that moving contact 2 forms two minutes breakpoints with static contact complex one end, be used for respectively with first static contact 4 with two for a second static contact 3 cooperation, two moving contact arms 21 can form V type or U type or similar structure, moving contact linking arm 22 becomes I type linear structure, also can have suitable buckling or protruding, all belongs to the utility model discloses a protection scope, two moving contact arms 21 are more close the U type in this embodiment. The Y-shaped moving contact 2 may be an integrated structure, or may be formed by riveting or welding two moving contact arms 21 and one moving contact connecting arm 22.

Preferably, one end of the movable contact connecting arm 22 for connecting with the operating mechanism is provided with a movable contact insulating sleeve 23.

Specifically, the moving contact 2 of this embodiment comprises two Z type moving contact pieces, every Z type moving contact piece is by the first parallel section that connects gradually, buckling section and second parallel section constitute, the side of the first parallel section of two Z type moving contact pieces is hugged closely and is formed moving contact linking arm 22, the buckling section of two Z type moving contact pieces is buckled to opposite direction and is extended the second parallel section interval that makes two Z type moving contact pieces and set up, the buckling section and the second parallel section of two Z type moving contact pieces form two moving contact arms 21, second parallel section one end is buckled to one side direction and the tip is equipped with the moving contact. One end of the contact connecting arm 22 connected with the contact support 13 is provided with a movable contact insulating sleeve 23, and the movable contact insulating sleeve 23 wraps one end of the contact connecting arm 22.

The assembly method of the moving contact 2 of this embodiment is, be equipped with the moving contact installation cavity on the contact support 13, the moving contact installation cavity is inserted together to moving contact connecting arm 22 one end and moving contact insulating bush 23, and moving contact connecting arm 22 is fixed with contact support 13 through axis of rotation and spring, and the axis of rotation passes moving contact connecting arm 22 one end and moving contact insulating bush 23 and is connected with contact support 13, carries out elastic fixation in order to realize the overtravel to moving contact connecting arm 22 through the spring. The contact support 13 is a contact rotating shaft, a plurality of moving contact mounting cavities are radially arranged, a moving contact 2 of the multi-pole contact mechanism can be mounted, the moving contact 2 can rotate along with the contact support 13 to drive a moving contact at one end of the moving contact 2 to swing, and the moving contact 2 can also independently rotate around the rotating shaft to realize overtravel. As another embodiment, the movable contact 2 may also be mounted on a four/five-bar operating mechanism to rotate independently about a rotating shaft.

As shown in fig. 7, the first fixed contact 4 includes a first fixed contact plate 41 for cooperating with the movable contact 2, and a first fixed connection plate 42 connected to the first fixed contact plate 41, wherein one end of the first fixed contact plate 41 connected to the first fixed connection plate 42 is bent in a reverse direction, so that an end of the other end of the first fixed contact plate 41 is located on one side of the first fixed connection plate 42 to form a U-shaped structure, and a direction of a current flowing through the first fixed connection plate 42 is opposite to a direction of a current flowing through the first fixed contact plate 41. In the example of fig. 4 and 7, the first static contact plate 41 is folded back and then stacked at an interval above the first static connection plate 42, and the first static connection plate 42 is used for wiring electrical connection. In this embodiment, the first fixed contact 4 is integrally formed by bending a sheet-shaped first contact plate, a front section of the first contact plate is reversely bent to form a first fixed contact plate 41, a middle section of the first contact plate forms a first fixed connection plate 42, a tail section of the first contact plate forms a second terminal 17 for wiring, and a staggered step is formed by bending the second terminal 17 and the first fixed connection plate 42 so as to adapt to a wiring position. Of course, the first stationary connecting plate 42 may also be electrically connected to the second terminal 17 by a wire or other mechanism. Further, one end of the first static contact plate 41 is provided with a static contact, and the first static contact plate 41 is reversely bent by more than 180 degrees, so that the first static contact plate 41 is inclined relative to the first static connection plate 42, and the static contact is obliquely arranged to be matched with the moving contact on the moving contact 2.

As shown in fig. 8, the second fixed contact 3 includes a second fixed contact plate 31 for cooperating with the movable contact 2, and a second fixed connection plate 32 connected to the second fixed contact plate 31, one end of the second fixed contact plate 31 is connected to the second fixed connection plate 32, and the other end extends in a direction away from the second fixed connection plate 32, so that a current flowing through the second fixed connection plate 32 is in the same direction as a current flowing through the second fixed contact plate 31. In the example of fig. 3 and 8, the end of the second static connecting plate 32 connected to the second static contact plate 31 is bent upward to connect to the second static contact plate 31 to raise the second static contact plate 31, the end of the second static contact plate 31 provided with the static contact is bent downward so that the static contact is obliquely arranged to match with the moving contact on the moving contact 2, and the other end of the second static connecting plate 32 is used for connecting the wires and electrically connecting. In this embodiment, the other end of the second stationary connecting plate 32 is electrically connected to the trip system 15, and the trip system 15 is electrically connected to the first terminal 16. Of course, the second stationary connecting plate 32 may be directly connected to the trip system 15, or may be connected to the trip system 15 through a flexible conductor, and the other end of the second stationary connecting plate 32 may be electrically connected to the first terminal 16 directly or through another mechanism.

Novel contact system, no matter main loop current is from the second wiring end 17 inflow of circuit breaker, first wiring end 16 flows out, still flows in from the first wiring end 16 of circuit breaker, second wiring end 17 flows out, can both reach the effect of moving, static contact repulsion each other, when the circuit breaker meets the fault current separating brake, can move when breaking with the help of the circuit breaker, the separating speed of circuit breaker is accelerated to the mutual repulsion between the static contact, promotes the breaking capacity of circuit breaker.

As shown in fig. 7-8, when the second terminal 17 is used as a wire inlet end and the first terminal 16 is used as a wire outlet end, when the circuit breaker of the contact system of the present invention is switched on, moving contacts on two moving contact arms 21 of the moving contact 2 are simultaneously contacted with two stationary contacts of the first stationary contact 4 and the second stationary contact 3, respectively, a main circuit current flows into the circuit breaker through the wire inlet end, a main circuit current in the circuit breaker reversely flows through the first stationary contact 4, and then flows in forward direction through one moving contact arm 21 (the left moving contact arm 21 in fig. 2) of the Y-shaped moving contact 2, at this time, the first stationary contact 4 with reverse current and the moving contact arm 21 with forward current form an effect of mutual exclusion of the opposite current (fig. 7); then, the main circuit current flows in a reverse direction through the other movable contact arm 21 (the right movable contact arm 21 in fig. 2) of the Y-shaped movable contact 2 and then flows in a forward direction through the second fixed contact 3, the right movable contact arm 21 with the current in the reverse direction and the flat-type fixed contact plate 3 with the current in the forward direction form an effect of mutual exclusion of the anisotropic current (fig. 8), and then the main circuit current flows in the tripping system through the second fixed contact 3, flows in the outlet terminal through the tripping system, and finally flows out of the circuit breaker. When the first terminal 16 is used as a wire inlet end and the second terminal 17 is used as a wire outlet end, the current directions of the first static contact 4 and one movable contact arm 21 (left side in fig. 2) matched with the first static contact are always opposite, and the current directions of the second static contact 3 and one movable contact arm 21 (right side in fig. 2) matched with the second static contact are always opposite, so that the effect of mutual repulsion of the currents in different directions can be formed, the breaking speed of the circuit breaker can be accelerated by means of the mutual repulsion force between the static and dynamic contacts during breaking of the circuit breaker, and the breaking capacity of the circuit breaker can be improved.

Preferably, a part of the second stationary contact 3 connected to the tripping system 14 is provided with a stationary contact insulating sleeve.

As a further improvement point of the present invention, as shown in fig. 2, each pole contact mechanism further includes a static contact insulating cover 6 for separating the first static contact 4 from the second static contact 3.

As shown in fig. 5 to 6, in a preferred embodiment of the static contact insulating cover 6, the static contact insulating cover 6 is a cover shell structure with an opening at the bottom, and is used for separating the first static contact 4 and the second static contact 3 from one end of the movable contact 2, an insulating partition 61 is arranged in the static contact insulating cover 6 to separate the static contact insulating cover 6 into two cavities, the two cavities are respectively a first cavity matched with the second static contact 3 and a second cavity matched with the first static contact 4, a first inlet 62 for the second static contact 3 to extend into is arranged at a position of one end side wall of the static contact insulating cover 6 corresponding to the first cavity, a second inlet 63 for the first static contact 4 to extend into is arranged at a position of the other end side wall of the static contact insulating cover 6 corresponding to the second cavity, and a first mounting hole 64 and a second mounting hole for the static contact of the second static contact 3 and a static contact of the first static contact 4 to extend out are respectively arranged at the top of the static contact insulating cover 6 corresponding to the first cavity And a hole 65. The static contact insulating cover 6 separates the first static contact 4 and the second static contact 3 of the second family of power, makes compact structure and safe and reliable.

Preferably, as shown in fig. 2, 5 and 6, the stationary contact insulating cover 6 further covers the first stationary connecting plate 42 of the first stationary contact 4, and an end of the stationary contact insulating cover 6, which is provided with the second inlet 63, extends upward to form an insulating sidewall 66 for isolating the second terminal 17.

Preferably, as shown in fig. 1, the arc extinguishing chamber 5 of the arc extinguishing system is mounted on the stationary contact insulating cover 6. The arc extinguish chamber 5 is arranged on the static contact insulating cover 6 corresponding to the first static connecting plate 42 and covers the two static contacts on the first static contact 4 and the second static contact 3. The static contact insulating cover 6 is provided with a U-shaped groove for installing the arc extinguish chamber 5, the U-shaped groove for installing the arc extinguish chamber 5 is formed between the insulating side wall 66 and one end provided with the static contact, the arc extinguish chamber 5 is installed in the U-shaped groove and covers the two static contacts, and the inlet side of the arc extinguish chamber 5 faces the moving contact 2.

As a further improvement point of the present invention, as shown in fig. 1 and 3, the arc extinguishing system includes an arc extinguishing chamber 5, the arc extinguishing chamber 5 is provided with two separated arc extinguishing chambers for respectively cooperating with the moving contacts on two moving contact arms 21 of the moving contact 2 of the Y-type, and two moving contacts of the moving contact 2 of the Y-type respectively extend to swing in the two arc extinguishing chambers, and respectively cooperate with the stationary contacts of the first stationary contact 4 and the second stationary contact 3. When the breaker is opened, two moving contacts of the Y-shaped moving contact 2 are separated from the static contacts of the first static contact 4 and the second static contact 3, the effect of voltage-dividing arc-extinguishing at the same side of double breakpoints of a single-pole contact system is achieved, the arc-extinguishing chamber is suitable for arc-extinguishing of alternating-current and direct-current circuits, the bottom of the arc-extinguishing chamber 5 is opened, and the static contacts are assembled in a matched mode, so that two arc-extinguishing chambers of the arc-extinguishing chamber 5 are covered on the. When the circuit breaker breaks the loop current, the two breakpoints of the contact mechanism at the same side of the single pole are respectively disconnected in the two arc extinguishing chambers in the arc extinguishing chamber, and when the circuit breaker is connected with the loop current, the two breakpoints of the contact mechanism at the same side of the single pole are respectively closed in the two arc extinguishing chambers in the arc extinguishing chamber. When the circuit breaker loop has fault current, the voltage-dividing arc extinction can be completed in the single-pole double-cavity arc extinction chamber. The utility model discloses an explosion chamber 5 can not only with the utility model discloses a contact mechanism cooperation also can cooperate with other monopole double break point contact mechanism, promptly with the moving contact that is equipped with two movable contacts to and the static contact cooperation that is equipped with two stationary contacts, for example the first static contact of static contact can not make the electric current reverse, and first static contact and second static contact can set up side by side and constitute stationary contact etc.. The breaker has increased a breakpoint in homopolar, has realized the partial pressure, has just so realized breaking the purpose of higher voltage in the monopole, and the two-chamber explosion chamber also accords with the requirement that direct current undercurrent divides the disconnected narrow arc way that needs.

The utility model discloses an embodiment of explosion chamber 5, explosion chamber 5 in be equipped with the arc extinguishing bars piece of the range upon range of setting in a plurality of intervals, the arc extinguishing breach that is equipped with two intervals and sets up in arc extinguishing bars piece one end forms W type breach, two arc extinguishing breachs of the range upon range of setting in a plurality of intervals form two arc extinguishing chambers for respectively with two movable contact cooperations of the moving contact 2 of Y type, can be applicable to alternating current-direct current circuit.

As shown in fig. 9-10, the preferred embodiment of the arc extinguish chamber 5 of the present invention, the arc extinguish chamber housing of the arc extinguish chamber 5 is separated into two cavities by the partition plate 55, and the arc extinguishing grid pieces 53, which are disposed in each cavity and stacked at a plurality of intervals, form two arc extinguishing chambers, which can be applied to ac/dc circuits. Preferably, at least one permanent magnet 54 is disposed on both sides of each arc-extinguishing chamber, suitable for arc extinction by a direct current circuit, and one or two or more permanent magnets 54 may be disposed on each side of each arc-extinguishing chamber as needed. Further, the top of the arc extinguish chamber housing is provided with two permanent magnets 54 corresponding to the two arc extinguish chambers, and in this embodiment, the top of the arc extinguish chamber housing is provided with two permanent magnets 54, and each permanent magnet 54 corresponds to one arc extinguish chamber. The permanent magnets on the two sides are used for increasing a magnetic field when the direct current is cut off, the magnetic field is formed by the permanent magnets, and the current is blown into the arc extinguish chamber. The top permanent magnet is used for absorbing the electric arc into the top arc-extinguishing grid plate by magnetizing the arc-extinguishing grid plate through the permanent magnet under the condition that the space is not enough after the volume is reduced, and the top permanent magnet is arranged for large-current breaking.

Preferably, permanent magnets 54 are arranged on two sides of each arc extinguishing chamber, the permanent magnets on two sides of the two arc extinguishing chambers are divided into two groups, and the polarity directions of the permanent magnets in each group are respectively N, S arranged in opposite and same directions, that is, if the upper part of the permanent magnet on the left side in each group of permanent magnets is N, and the lower part is S, the upper part of the permanent magnet on the right side is N, and the lower part is S; vice versa, if the permanent magnet on the left side is S above, the permanent magnet on the right side is S above. The permanent magnet is provided with a magnetic pole direction according to the left-hand rule, the four-finger direction is the current direction, and the magnetic field penetrates through the palm center to ensure that the electromagnetic force direction is the direction pointing to the arc extinguishing grid piece in the corresponding arc extinguishing cavity. The magnetic pole directions of the two groups of permanent magnets can be the same or different.

Preferably, two permanent magnets 54 on the top of the arc extinguishing chamber housing correspond to the two arc extinguishing chambers, respectively, and the magnetic poles of the two permanent magnets 54 are arranged in opposite directions.

As shown in fig. 9, each arc extinguishing chamber is provided with an arc extinguishing grid group including a plurality of stacked arc extinguishing grid pieces 53, each arc extinguishing grid piece 53 is made of a non-magnetic material, and one end of each arc extinguishing grid piece 53 is provided with an arc extinguishing gap. Preferably, each group of arc chute plates includes a plurality of differently sized arc chute plates 53. As shown in fig. 10, each arc-extinguishing grid group includes first arc-extinguishing grid pieces 536, second arc-extinguishing grid pieces 535, third arc-extinguishing grid pieces 534 and fourth arc-extinguishing grid pieces 533 with different sizes, each arc-extinguishing grid group is formed by sequentially stacking at least one first arc-extinguishing grid piece 536, at least one third arc-extinguishing grid piece 534, at least one second arc-extinguishing grid piece 535, a plurality of third arc-extinguishing grid pieces 534, at least one second arc-extinguishing grid piece 535, at least one third arc-extinguishing grid piece 534 and at least one fourth arc-extinguishing grid piece 533 from top to bottom, the first arc-extinguishing grid piece 536 can block an arc, the rest arc-extinguishing grid pieces can be divided to extinguish the arc, and the thickness of the fourth arc-extinguishing grid piece 533 is greater than that of the other arc-extinguishing grid pieces, so that the arc is prevented from being melted and evaporated by the bottom of the arc-collecting chamber. Further, an arc striking lug bent downward is arranged in the arc extinguishing gap of the first arc extinguishing grid piece 536, and the length of the third arc extinguishing grid piece 534 and the depth of the arc extinguishing gap are greater than the length of the second arc extinguishing grid piece 535 and the depth of the arc extinguishing gap. As a deterioration, it is obvious that the structure of a plurality of arc chute pieces can be the same.

Preferably, the arc extinguishing gaps of the arc extinguishing grid pieces 53 are in a V shape or a U shape. In this embodiment, the arc-extinguishing gaps of the arc-extinguishing grid plates 53 are U-shaped, and the bottom of the U-shaped arc-extinguishing gaps of the second arc-extinguishing grid plate 535 and the third arc-extinguishing grid plate 534 are further provided with a communicating notch to form an arc-extinguishing gap similar to a Y-shape. The U-shaped arc-extinguishing gap of the first arc-extinguishing grid 536 is provided with an arc-striking lug therein.

Preferably, the arc extinguishing chamber housing and the partition plate 55 may be integrally formed to form two cavities, and a plurality of grid clamping grooves for mounting the arc extinguishing grid 53 and a magnet mounting groove for mounting the permanent magnet 54 are formed in the side walls of the two sides of the cavity. The arc extinguish chamber shell can also be formed by assembling.

As shown in fig. 9 to 10, the arc chute housing of the arc chute 5 comprises an arc chute cover 51 and an arc chute frame 52, and the arc chute cover 51 and the arc chute frame 52 are assembled to form the arc chute housing.

The arc extinguishing chamber frame 52 comprises a first outer side wall 521, a middle side wall 522 and a second outer side wall 523 which are vertically arranged in parallel at intervals in sequence, and further comprises a top wall 524 arranged on the tops of the first outer side wall 521, the middle side wall 522 and the second outer side wall 523; arc extinguishing chamber frame 52 one side opening is for facing the entrance side of moving contact 2, and the opposite side opening is for the assembly side with arc extinguishing chamber cover 51 assembly, arc extinguishing chamber cover 51 includes two cover lateral walls 511 that vertical interval set up, the cover backplate 513 of being connected with two cover lateral walls 511 one side, sets up the cover upper cover 512 at two cover lateral walls 511 and cover backplate 513 tops, arc extinguishing chamber frame 52's assembly side is connected with arc extinguishing chamber cover 51, makes two cover lateral walls 511 of arc extinguishing chamber cover 51 and arc extinguishing chamber frame 52's first lateral wall 521 and second lateral wall 523 butt joint, and arc extinguishing chamber cover 51 covers upper cover 512 and arc extinguishing chamber frame 52 roof 524 butt joint and forms the arc extinguishing chamber casing, and division board 55 separates into two cavitys with the arc extinguishing chamber casing.

On the inlet side of the arc extinguishing chamber frame 52, the first outer side wall 521, the middle side wall 522 and the second outer side wall 523 are provided with magnet installation grooves 525 for installing the permanent magnets 54, both side walls of the middle side wall 522 are provided with the magnet installation grooves 525, the permanent magnets 54 are installed in the magnet installation grooves 525, and the magnet installation grooves 525 are sealed by the baffle 540. The magnet mounting groove 525 is a square groove matched with the permanent magnet 54, and the plurality of baffle plates 540 are respectively clamped with the arc extinguishing chamber frame 52.

On the assembly side of the arc chute frame 52, the side wall between the first outer side wall 521 and the middle side wall 522, and the side wall between the middle side wall 522 and the second outer side wall 523 are provided with a plurality of grid front slots 526 for installing arc-extinguishing grids; the assembly side of the partition plate 55 and the middle side wall 522 is connected and protruded outside the arc extinguishing chamber frame 52; two magnet mounting grooves 525 for mounting the permanent magnets 54 are provided on the top wall 524, the permanent magnets 54 are mounted in the magnet mounting grooves 525, and the permanent magnets 54 on the top wall 524 are closed by the arc chute cover 51 at the cover upper cover 512.

The middle of the cover back plate 513 is provided with a partition plate clamping groove 51 for fixing the partition plate 55, and the inner side walls of the two cover side walls 511 are provided with a plurality of grid sheet rear clamping grooves 516 for mounting arc extinguishing grid sheets 53.

Preferably, exhaust barrier net structure 518 is provided on the cage back 513. Preferably, exhaust barrier net structure 518 is disposed on an upper side of enclosure back 513 adjacent enclosure sidewall 511, and exhaust barrier net structure 518 includes a plurality of small exhaust holes arranged in an array. Of course, the cage back 513 may be provided with only a few large exhaust holes.

Preferably, the cover top 512 protrudes toward the arc chute frame 52 to form a pressing plate, and the pressing plate seals the permanent magnet 54 on the top wall 524 of the arc chute frame 52 after the arc chute cover 51 is assembled with the arc chute frame 52.

Arc extinguishing chamber cover 51 and arc extinguishing chamber frame 52 buckle installation are equipped with a plurality of first buckles 517 at arc extinguishing chamber cover 51, arc extinguishing chamber frame 52 is last to be equipped with a plurality of and first buckle 517 complex first buckle groove 52.

The assembly method of the arc-extinguishing chamber 5 is that the front ends of the first group of a plurality of arc-extinguishing grids 52 which are arranged at intervals and are provided with arc-extinguishing gaps are inserted into the grid front clamping grooves 526 between the first outer side wall 521 and the middle side wall 522 of the arc-extinguishing chamber frame 52 in parallel, and the front ends of the second group of a plurality of arc-extinguishing grids 52 which are arranged at intervals and are provided with arc-extinguishing gaps are inserted into the grid front clamping grooves 526 between the middle side wall 522 and the second outer side wall 523 in parallel; the two permanent magnets 54 are mounted on the magnet mounting grooves 525 of the first outer side wall 521 and the middle side wall 522, the two permanent magnets 54 are mounted on the magnet mounting grooves 525 of the middle side wall 522 and the second outer side wall 523, and the magnet mounting grooves 525 are sealed by the baffle 540; the two permanent magnets 54 are installed on the top of the arc extinguish chamber frame 52, the arc extinguish chamber cover 51 is clamped with the arc extinguish chamber frame 52 from the assembling side of the arc extinguish chamber frame 52, the first clamp 517 is clamped into the first clamp groove 52, the partition plate 55 is clamped into the partition plate clamp groove 51, the rear ends of the two groups of arc extinguish grid plates 52 are clamped into the grid plate rear clamp groove 516 of the arc extinguish chamber cover 51, two cover side walls 511 of the arc extinguish chamber cover 51 are butted with a first outer side wall 521 and a second outer side wall 523 of the arc extinguish chamber frame 52, the cover upper cover 512 of the arc extinguish chamber cover 51 is butted with the top wall 524 of the arc extinguish chamber frame 52 to form an arc extinguish, the magnet installation groove 52 at the top of the arc extinguish chamber frame 52 is sealed by the pressing plate protruding from the upper cover 512 of the cover, and an arc extinguish chamber is formed by a cavity surrounded by the first outer side wall 521, the corresponding cover side wall 511, the middle side wall 522 and the partition plate 55 and a plurality of arc extinguish grid plates 52 of the first group; the second outer side wall 523, the corresponding other cover side wall 511 and the middle side wall 522 form a cavity surrounded by the second group of arc extinguishing grid pieces 52 to form another arc extinguishing cavity; the arc extinguish chamber 5 of the embodiment is convenient to assemble and compact and reliable in structure.

When circuit breaker return circuit fault current appears, two breakpoints of the contact mechanism of monopole homonymy break off respectively in two arc extinguishing chambeies in the explosion chamber, can accomplish the partial pressure arc extinguishing in monopole double-chamber arc extinguishing chamber, and electric arc is separated into a plurality of short arcs by a plurality of arc extinguishing bars piece under the promotion of the magnetic field of arc in the explosion chamber and fluid effect, relies on the deionization effect of metal arc separation piece intensive electric arc, makes electric arc diminish gradually, until extinguishing. Therefore, the high-voltage arc extinguishing capability of the direct current circuit breaker is improved. The arc extinguishing chamber can be used for an alternating current circuit breaker after the permanent magnet is removed.

The foregoing is a more detailed description of the present invention, taken in conjunction with the specific preferred embodiments thereof, and it is not intended that the invention be limited to the specific embodiments shown and described. To the utility model belongs to the technical field of ordinary technical personnel, do not deviate from the utility model discloses under the prerequisite of design, can also make a plurality of simple deductions or replacement, all should regard as belonging to the utility model discloses a protection scope.

Claims (15)

1. A contact mechanism, characterized by: comprises a Y-shaped moving contact (2) and a static contact consisting of a first static contact (4) and a second static contact (3),

the moving contact (2) comprises two moving contact arms (21) and a moving contact connecting arm (22), one end of each of the two moving contact arms (21) is connected with one end of the moving contact connecting arm (22), and the other ends of the two moving contact arms (21) are arranged at intervals to form a Y-shaped moving contact (2);

the first static contact (4) is of a U-shaped structure capable of reversing current, and comprises a first static contact plate (41) matched with the moving contact (2) and a first static connection plate (42) connected with the first static contact plate (41), wherein one end, connected with the first static connection plate (42), of the first static contact plate (41) is reversely bent, so that the end part of the other end of the first static contact plate (41) is located on one side of the first static connection plate (42) to form the U-shaped structure, and the direction of the current flowing through the first static connection plate (42) is opposite to the direction of the current flowing through the first static contact plate (41);

the two movable contact arms (21) are respectively matched with a first static contact plate (41) and a second static contact (3) of the first static contact (4), so that the direction of current flowing through the first static contact plate (41) is opposite to the direction of current flowing through one movable contact arm (21) matched with the first static contact plate (41) when the movable contact is closed, and the direction of current flowing through the second static contact (3) is opposite to the direction of current flowing through the other movable contact arm (21) matched with the second static contact (3).

2. The contact mechanism of claim 1, wherein: the first fixed contact (4) and the second fixed contact (3) are arranged side by side at one end matched with the moving contact (2) and are arranged corresponding to one ends of two moving contact arms (21) of the moving contact (2); the other ends of the first fixed contact (4) and the second fixed contact (3) extend in opposite directions, and one end of the movable contact (2) provided with a movable contact connecting arm (22) extends in the same direction as the second fixed contact (3).

3. The contact mechanism of claim 2, wherein: the first fixed contact (4), the second fixed contact (3) and the moving contact (2) are matched, one ends of the first fixed contact and the second fixed contact are respectively provided with a fixed contact, the other ends of the first fixed contact and the second fixed contact extend in opposite directions and are respectively electrically connected with a second wiring terminal (17) and a first wiring terminal (16) at two ends of the circuit breaker, one of the second wiring terminal (17) and the first wiring terminal (16) is an incoming line terminal, and the other one of the second wiring terminal and the first wiring terminal is an outgoing line.

4. A contact arrangement according to any of claims 1 to 3, wherein: one end of each of the two moving contact arms (21) of the moving contact (2) which is matched with the first fixed contact (4) and the second fixed contact (3) is provided with a moving contact, a moving contact connecting arm (22) of the moving contact (2) is used for being connected with an operating mechanism, and one end of each of the moving contact connecting arms (22) which is used for being connected with the operating mechanism is provided with a moving contact insulating sleeve (23).

5. The contact mechanism of claim 1, wherein: the static contact structure further comprises a static contact insulating cover (6) used for separating the first static contact (4) from the second static contact (3).

6. The contact mechanism of claim 1, wherein: the moving contact (2) comprises two Z type moving contact pieces, every Z type moving contact piece is by the first parallel section that connects gradually, buckling section and second parallel section constitute, the side of the first parallel section of two Z type moving contact pieces is hugged closely and is formed moving contact linking arm (22), the buckling section of two Z type moving contact pieces is buckled to opposite direction and is extended the second parallel section interval that makes two Z type moving contact pieces and set up, the buckling section and the second parallel section of two Z type moving contact pieces form two moving contact arms (21), second parallel section one end is buckled to one side direction and the tip is equipped with the moving contact.

7. The contact mechanism of claim 1, wherein: and one end of the first static contact plate (41) is provided with a static contact, and the first static contact plate (41) is reversely bent by more than 180 degrees, so that the first static contact plate (41) is inclined relative to the first static connection plate (42).

8. The contact mechanism of claim 1 or 7, wherein: the first static contact (4) is integrally formed and formed by bending a sheet-shaped first contact plate, the front section of the first contact plate is reversely bent to form a first static contact plate (41), the middle section of the first contact plate forms a first static connection plate (42), the tail section of the first contact plate forms a second wiring end (17) for wiring, and a staggered step is formed by bending the second wiring end (17) and the first static connection plate (42).

9. The contact mechanism of claim 1, wherein: the second static contact (3) comprises a second static contact plate (31) matched with the moving contact (2) and a second static connection plate (32) connected with the second static contact plate (31), one end of the second static contact plate (31) is connected with the second static connection plate (32), the other end of the second static contact plate extends in the direction far away from the second static connection plate (32), the direction of current flowing through the second static connection plate (32) is the same as the direction of current flowing through the second static contact plate (31), one end, connected with the second static contact plate (31), of the second static connection plate (32) is bent upwards to be connected with the second static contact plate (31), and one end, provided with a static contact, of the second static contact plate (31) is bent downwards to enable the static contact to be obliquely arranged.

10. The contact mechanism of claim 5, wherein: the bottom of the static contact insulating cover (6) is open, an insulating partition plate (61) is arranged in the static contact insulating cover (6) to divide the static contact insulating cover (6) into two cavities, the two cavities are respectively a first cavity matched with the second static contact (3) and a second cavity matched with the first static contact (4), a first inlet (62) for the second static contact (3) to extend into is arranged at the position, corresponding to the first cavity, of the side wall at one end of the static contact insulating cover (6), a second inlet (63) for the first static contact (4) to extend into is arranged at the position, corresponding to the second cavity, of the side wall at the other end of the static contact insulating cover (6), the top of the static contact insulating cover (6) is provided with a first mounting hole (64) and a second mounting hole (65) which are used for extending out of a static contact of the second static contact (3) and a static contact of the first static contact (4) corresponding to the first cavity and the second cavity respectively.

11. The contact mechanism of claim 10, wherein: the static contact insulation cover (6) is used for covering a first static connecting plate (42) of the first static contact (4), the first static connecting plate (42) is connected with the second wiring terminal (17), an insulation side wall (66) used for isolating the second wiring terminal (17) extends upwards from one end, provided with a second inlet (63), of the static contact insulation cover (6), and a U-shaped groove used for installing an arc extinguish chamber (5) is formed in the static contact insulation cover (6).

12. The utility model provides a switching apparatus, includes contact system and arc extinguishing system, its characterized in that: the contact system comprising at least one contact mechanism according to any of claims 1-11.

13. The switching device according to claim 12, characterized in that: arc extinguishing system includes explosion chamber (5) that corresponds the setting with contact mechanism, explosion chamber (5) are equipped with two separated arc extinguishing chamber.

14. The switching device according to claim 13, characterized in that: arc extinguishing chamber (5) in be equipped with the range upon range of arc extinguishing bars piece that sets up in a plurality of intervals, be equipped with the arc extinguishing breach that two intervals set up and form W type breach in arc extinguishing bars piece one end, two arc extinguishing breachs of the range upon range of arc extinguishing bars piece that sets up in a plurality of intervals form two arc extinguishing chambers for respectively with two movable contact cooperations of moving contact (2) of Y type.

15. The switching device according to claim 13, characterized in that: the arc extinguishing chamber shell of the arc extinguishing chamber (5) is divided into two cavities through a partition plate (55), and a plurality of arc extinguishing grid pieces (53) which are arranged at intervals in a stacked mode are arranged in each cavity to form two arc extinguishing cavities; at least one permanent magnet (54) is arranged on both sides of each arc extinguishing chamber, and/or a permanent magnet (54) is arranged on the top of each arc extinguishing chamber.

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