CN221927879U

CN221927879U - Arc extinguishing device, switch unit and rotary isolating switch

Info

Publication number: CN221927879U
Application number: CN202323205594.3U
Authority: CN
Inventors: 宋琛; 敖登贵; 王虎
Original assignee: Shanghai Chint Intelligent Technology Co Ltd
Current assignee: Shanghai Chint Intelligent Technology Co Ltd
Priority date: 2023-11-27
Filing date: 2023-11-27
Publication date: 2024-10-29
Anticipated expiration: 2033-11-27

Abstract

The utility model discloses an arc extinguishing device, a switch unit and a rotary isolating switch, comprising: a first housing and a permanent magnet disposed on the first housing; an arc-shaped groove for avoiding the motion track of the head contact end of the movable contact is formed in one side, facing the movable rotating shaft of the isolating switch, of the first shell; the permanent magnets comprise first permanent magnets and second permanent magnets, the first permanent magnets are arranged corresponding to the first side walls of the arc-shaped grooves, and the second permanent magnets are arranged corresponding to the second side walls of the arc-shaped grooves; the homopolar of the first permanent magnet and the homopolar of the second permanent magnet are oppositely arranged. The utility model can improve the arc extinguishing effect of the switch unit.

Description

Arc extinguishing device, switch unit and rotary isolating switch

Technical Field

The utility model relates to the field of piezoelectric devices, in particular to an arc extinguishing device, a switch unit and a rotary isolating switch.

Background

Rotary disconnectors are generally made up of an operating mechanism unit and several stacked switching units. The switch unit includes unit housings each having a pair of stationary contact assemblies and a rotatable movable contact module mounted therein. The movable contact module is fixed on the rotating shaft, and the operating mechanism unit can operate the rotating shaft to rotate, so that the movable contact and the fixed contact are closed or opened.

In the prior art, a metal arc-extinguishing grid plate component is usually additionally arranged in the switching device, or a form of a permanent magnet and the arc-extinguishing grid plate component is adopted, the arc-extinguishing purpose is achieved by guiding an arc to the arc-extinguishing grid plate, and the arc-extinguishing performance of the tail end of an arc path can be optimized by additionally arranging the permanent magnet. However, in the prior art, the structure mode has the problem of poor arc extinguishing effect on the low-current switching device.

Disclosure of utility model

The utility model aims to overcome the defects of the prior art and provides an arc extinguishing device, a switch unit and a rotary isolating switch, which are beneficial to improving the arc extinguishing effect of the rotary isolating switch with small current.

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

An arc extinguishing device, comprising: a first housing and a permanent magnet disposed on the first housing;

An arc-shaped groove for avoiding the motion track of the head contact end of the movable contact is formed in one side, facing the movable rotating shaft of the isolating switch, of the first shell;

The permanent magnets comprise first permanent magnets and second permanent magnets, the first permanent magnets are arranged corresponding to the first side walls of the arc-shaped grooves, and the second permanent magnets are arranged corresponding to the second side walls of the arc-shaped grooves;

The homopolar of the first permanent magnet and the homopolar of the second permanent magnet are oppositely arranged.

Preferably, the first permanent magnet is of a plate-shaped structure corresponding to the shape of the arc-shaped groove, the first side wall is provided with a first limit groove, and the first permanent magnet is embedded in the first limit groove.

Preferably, the second permanent magnet has a plate-like structure corresponding to the shape of the arc-shaped groove; the second side wall is provided with a second limiting groove, and the second permanent magnet is embedded in the second limiting groove.

Preferably, the notch of the first limit groove and the notch of the second limit groove are opposite to the notch of the arc-shaped groove.

Preferably, the notch of the first limiting groove and the notch of the second limiting groove are provided with first ribs extending outwards.

Preferably, the first protruding rib comprises an arc rib which is adaptive to the long directions of the notch of the first limit groove and the notch of the second limit groove.

Preferably, the first protruding rib comprises vertical ribs corresponding to two ends of the notch of the first limiting groove and the second limiting groove.

Preferably, the outer surfaces of the first side wall and the second side wall are provided with positioning bosses, and one side of each positioning boss, which faces the moving contact, is provided with a second convex rib.

Preferably, the first housing is made of a gas generating material.

The utility model also provides a switching unit comprising: the device comprises a unit shell, at least one pair of fixed contacts arranged in the unit shell, a moving contact rotationally arranged in the unit shell and an arc extinguishing device arranged at the edge of a moving track of the moving contact and close to the fixed contacts, wherein the arc extinguishing device is any one of the arc extinguishing devices.

Preferably, the section of the unit shell is rectangular, the unit shell comprises a pair of first side walls which are oppositely arranged, a pair of second side walls which are oppositely arranged, the moving contact is arranged in the middle of the unit shell, a pair of fixed contacts are oppositely arranged in the middle of the pair of first side walls, when the moving contact is in a switching-off position, the contact ends at the two ends of the moving contact respectively correspond to the middle of the pair of second side walls, when the moving contact is in a switching-on position, the contact ends at the two ends of the moving contact respectively contact with the pair of fixed contacts, and two arc extinguishing devices are positioned at the corners of the rectangle and respectively correspond to the movement tracks of the contact ends at the two ends of the moving contact.

Preferably, the main body of the moving contact is closed by an arc isolation cover, only the contact ends at two ends are exposed, the arc isolation cover comprises an upper arc isolation cover and a lower arc isolation cover, the upper arc isolation cover and the lower arc isolation cover clamp the main body of the moving contact in the main body, and the contact ends of the moving contact extend out of the outer sides of the upper arc isolation cover and the lower arc isolation cover.

A rotary isolation switch, comprising: the rotary handle, the operating mechanism unit and one or more switch units which are stacked in sequence, wherein the switch units are the switch units.

According to the arc extinguishing device of the switch unit, the arc grooves are arranged to coincide with the movement tracks of the contact ends of the movable contacts, so that generated arcs are basically generated in the arc grooves, and the permanent magnets are respectively arranged on the two side walls of the arc grooves, so that the arcs can be stretched through magnetic fields, arc columns are lengthened, arc voltage is improved, the arcing time can be reduced, and rapid extinction of the arcs is realized.

Furthermore, the shell of the arc extinguishing device is made of gas generating materials, the high temperature generated by the electric arc can enable the shell to generate gas, and the arc-shaped groove can be used as an air flow channel, so that the air flow can flow through the air flow channel and accurately act on the electric arc to enable the electric arc to be extinguished rapidly.

Based on the above, the utility model can promote the arc extinguishing effect of the switch unit of the rotary isolating switch, especially, can effectively extinguish the arc of the rotary isolating switch aiming at small current, and ensures the reliability of the switch.

Drawings

FIG. 1 is a schematic diagram of a rotary isolation switch of the present utility model;

fig. 2 is an exploded view of the assembly of the switch unit of the present utility model;

FIG. 3 is an axial view of the switch unit of the present utility model;

FIG. 4 is a schematic diagram of the flow of gas when the switching unit of the present utility model breaks an arc;

fig. 5 is an assembled exploded view of the moving contact module of the present utility model;

Fig. 6 is an axial view of the moving contact module of the present utility model;

FIG. 7 is an inner view of the upper arc plate of the present utility model.

In the figure:

the switch unit 100, the fixed contact 1, the moving contact 2, the contact end 21, the arc extinguishing device 3, the unit housing 5, the upper housing 51, the lower housing 52, the arc-shielding cover 70, the upper arc-shielding cover 71, the rotating shaft connecting structure 73, the lower arc-shielding cover 72, the first housing 31, the arc-shaped groove 311, the first side wall 3111, the second side wall 3112, the bottom wall 3119, the permanent magnet 32, the first permanent magnet 321, the second permanent magnet 322, the first protruding rib 313, the arc-shaped rib 3131, the vertical rib 3132, the second protruding rib 314, the first limiting groove 3113, the second limiting groove 3114, and the positioning boss 3115.

Detailed Description

The following describes further embodiments of the arc extinguishing device, the switching unit and the rotary isolating switch according to the utility model, in accordance with examples presented in connection with the accompanying drawings. The arc extinguishing device, the switching unit, and the rotary isolating switch of the present utility model are not limited to the description of the following embodiments.

The arc extinguishing device of this embodiment is applied to the switch unit, and the switch unit of this embodiment is applied to rotatory isolator, and specifically, a complete rotatory isolator includes twist grip, operating device unit and one or more switch units that pile up in proper order and set up, links concatenation (for example pivot) through the linkage piece between a plurality of switch units. The switch units can form a multi-pole combination of the rotary isolating switch, the stacked switch units can be configured into a single layer or multiple layers according to practical requirements, and the switch units realize the connection and disconnection of the internal circuits of the switch units through the switching-on and switching-off actions of the operating mechanism units.

As shown in fig. 1 to 3, there is shown a schematic structure of one layer of a switch unit 100, which includes a unit housing 5, at least one pair of fixed contacts 1 disposed in the unit housing 5, a moving contact 2 rotatably disposed in the unit housing 5, and an arc extinguishing device 3 disposed at an edge of a movement trace of the moving contact 2 and adjacent to the fixed contacts 1.

The unit housing 5 includes an upper housing 51 and a lower housing 52, the upper housing 51 and the lower housing 52 are respectively provided with a mounting structure for mounting the fixed contact 1, the moving contact 2, and the arc extinguishing device 3, and the upper housing 51 and the lower housing 52 are covered to fix the moving contact 2, the fixed contact 1, and the arc extinguishing device 3 therein.

Further, the main body of the moving contact 2 is closed by the arc-isolating cover 70, only the contact ends 21 at both ends are exposed, the arc-isolating cover 70 comprises an upper arc-isolating cover 71 and a lower arc-isolating cover 72, the upper arc-isolating cover 71 and the lower arc-isolating cover 72 clamp the main body of the moving contact 2 therein, the contact ends 21 of the moving contact 2 extend out of the outer sides of the upper arc-isolating cover 71 and the lower arc-isolating cover 72, and the movement track corresponds to the fixed contact 1 so as to be contacted with the fixed contact 1 through rotation. The upper arc-isolating cover 71 and the lower arc-isolating cover 72 are respectively provided with a rotating shaft connecting structure 73 for being in transmission connection with another switch unit through a rotating shaft or for being in transmission connection with an operating mechanism unit, and in this embodiment, the rotating shaft connecting structure 73 is a star-shaped key slot, and of course, a similar structure is also possible.

As shown in fig. 3-5, the moving contact 2 is arranged in the middle area of the unit housing 5 and is rotatably arranged, the rotating range of the moving contact 2 is determined by the contact end 21, and the moving contact 2 is a circular area, the fixed contact 1 is arranged at two opposite ends of the periphery of the circular area, and when the moving contact 2 rotates towards one side far away from the fixed contact 1 relative to the unit housing 5, the moving contact 2 can be matched with the fixed contact 1 to realize opening; when the movable contact 2 rotates towards one side close to the fixed contact 1 relative to the unit housing 5, the movable contact 2 can be matched with the fixed contact 1 to realize switching-on. The arc extinguishing device 3 is arranged in the region of the movement locus a, and the movement locus a of the contact end 21 of the moving contact 2 is positioned in the arc-shaped groove 311 of the arc extinguishing device 3. In this embodiment, the section of the unit housing 5 is rectangular, including a pair of first side walls that set up relatively, and a pair of second side walls that set up relatively, the moving contact 2 sets up in the middle part region of unit housing 5, a pair of stationary contact 1 set up in the middle part of a pair of first side walls relatively, when moving contact 2 is in the separating brake position, the contact end 21 at moving contact 2 both ends corresponds the middle part of a pair of second side walls respectively, when moving contact 2 is in the closing position, the contact end 21 at moving contact 2 both ends contacts with a pair of stationary contact 1 respectively, two arc extinguishing device (3) are located the terminal angle department of rectangle, correspond the motion trail of the contact end 21 at moving contact 2 both ends respectively.

As shown in fig. 6 and 7, the arc extinguishing device 3 includes: a first housing 31 and a permanent magnet 32 provided on the first housing 31; an arc-shaped groove 311 for avoiding the movement track a of the contact end 21 of the moving contact 2 is arranged on one side of the first shell 31 facing the moving shaft of the isolating switch, namely the movement track a is in the arc-shaped groove 311, the contact end 21 passes through the arc-shaped groove 311 when moving, and the arc-shaped groove 311 also forms an air flow channel.

Specifically, in the present embodiment, the arc-shaped groove 311 is a concave groove surrounded by a first side wall 3111, a second side wall 3112 and a bottom wall 3119, the permanent magnet 32 includes a first permanent magnet 321 and a second permanent magnet 322, the first permanent magnet 321 is disposed corresponding to the first side wall 3111 of the arc-shaped groove 311, and the second permanent magnet 322 is disposed corresponding to the second side wall 3112 of the arc-shaped groove 311; the first permanent magnet 321 and the second permanent magnet 322 are disposed with the same poles opposite to each other, and in this embodiment, the first permanent magnet 321 and the second permanent magnet 322 are disposed with the N poles opposite to each other. Of course, the S poles may be arranged opposite to each other.

In this embodiment, the first permanent magnet 321 is a plate-shaped structure corresponding to the shape of the arc-shaped groove 311 (more specifically, corresponding to the shape of the first side wall 3111), the first side wall 3111 is provided with a first limit slot 3113, and the first permanent magnet 321 is embedded in the first limit slot 3113.

Similarly, the second permanent magnet 322 has a plate-like structure (more specifically, a shape corresponding to the first sidewall 3111) corresponding to the shape of the arc-shaped groove 311; the second side wall 3112 is provided with a second limiting groove 3114, and the second permanent magnet 322 is embedded in the second limiting groove 3114.

In this embodiment, the shape of the first permanent magnet 321 may be various structures, may be a combination of multiple pieces, may be a single piece, may be a strip, or may be a plate. Correspondingly, the shape of the second permanent magnet 322 may be the same as or different from the first permanent magnet 321.

In this embodiment, the first permanent magnet 321 and the second permanent magnet 322 are located on the moving track of the moving contact 2 that is on/off with the fixed contact 1, and the first permanent magnet 321 and the second permanent magnet 322 are placed as close to the fixed contact 1 as possible, and the position of the fixed contact 1 is also corresponding to the port of the arc-shaped groove 311 as far as possible. Meanwhile, the first permanent magnet 321 and the second permanent magnet 322 correspond to the arc-shaped grooves in shape, so that a magnetic field formed between the first permanent magnet 321 and the second permanent magnet 322 can cover the moving track of the switching-on and switching-off of the moving contact assembly 2 in a large area, and accordingly an arc is stretched through the magnetic field between the permanent magnets 32, an arc column is lengthened, arc voltage is increased, and arc is extinguished rapidly by reducing arcing time.

In this embodiment, the first permanent magnet 321 and the second permanent magnet 322 may be disposed on the outer sides of the first side wall 3111 and the second side wall 3112, but in this embodiment, the first limit groove 3113 and the second limit groove 3114 are disposed, so that high temperature damage of the permanent magnet caused by direct action of arc or high temperature gas on the permanent magnet can be avoided.

Further, the notches of the first limit groove 3113 and the second limit groove 3114 are opposite to the notch of the arc-shaped groove 311, so that arc or high temperature gas can be prevented from directly acting on the permanent magnet, and safety and reliability of the permanent magnet are protected.

Further, the notches of the first and second limiting grooves 3113 and 3114 are provided with first ribs 313 extending outwards, and the first ribs 313 extending outwards can further shield the permanent magnets in the first and second limiting grooves 3113 and 3114, so as to avoid electric arcs or high-temperature air entering.

Specifically, the first rib 313 includes an arc rib 3131 adapted to the slot lengths of the first and second limiting slots 3113 and 3114, and vertical ribs 3132 corresponding to two ends of the slots of the first and second limiting slots 3113 and 3114, so that the whole slot can be protected in all directions.

In this embodiment, the outer surfaces of the first side wall 3111 and the second side wall 3112 are provided with a positioning boss 3115, the positioning boss 3115 is used for matching with a mounting structure in the unit housing, so as to position and mount the arc extinguishing device 3, and the positioning boss 3115 faces one side of the moving contact and is provided with a second convex rib 314, so that electric arcs and high-temperature gas can be further prevented from being strung into the permanent magnet through an assembly gap, and the protection performance of the permanent magnet is improved.

In this embodiment, the first housing 31 is made of a gas generating material, such as PA66, and after the electric arc enters the arc-shaped groove 311, the first housing 31 can generate gas, and the arc-shaped groove 311 can form an air flow channel c (refer to fig. 6), and the electric arc generated in the process of opening the movable contact assembly 2 and the stationary contact 1 enters the air flow channel c, so that the air flow can accurately act on the electric arc to quickly extinguish the electric arc.

Based on the above, in this embodiment, the arc extinguishing device of the switch unit is overlapped with the motion track of the contact end of the moving contact through setting up the arc recess for the arc that produces is produced basically in the arc recess, through setting up the permanent magnet respectively at the both sides wall of arc recess, thereby can stretch the arc through the magnetic field, makes the arc post elongate, promotes the arc voltage, and then can reduce the arcing time, realizes extinguishing fast of electric arc.

The switch unit of this embodiment is applicable to the rotatory isolator of low-current, and the switch unit electric arc of the rotatory isolator of low-current is aimed at the production and the extinction of switch unit electric arc, and this embodiment can be in short time quick arc extinction, guarantees the reliability of rotatory isolator of low-current. Of course, the switch unit and the arc extinguishing device thereof of the embodiment are also applicable to rotary isolating switches with larger current.

Based on the above, the present embodiment may further provide a rotary isolating switch, including: the rotary handle, the operating mechanism unit and one or more switch units which are stacked in sequence are arranged, and the switch units are the switch units in the embodiment.

It should be noted that, in the description of the present utility model, the terms "upper", "lower", "left", "right", "inner", "outer", and the like indicate an orientation or a positional relationship based on that shown in the drawings or an orientation or a positional relationship conventionally put in use, and are merely for convenience of description, and do not indicate that the apparatus or element to be referred to must have a specific orientation, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," "third," and the like are used merely to distinguish between descriptions and should not be construed as indicating relative importance.

The foregoing is a further detailed description of the utility model in connection with the preferred embodiments, and it is not intended that the utility model be limited to the specific embodiments described. It will be apparent to those skilled in the art that several simple deductions or substitutions may be made without departing from the spirit of the utility model, and these should be considered to be within the scope of the utility model.

Claims

1. An arc extinguishing device, characterized by comprising: a first housing (31) and a permanent magnet (32) provided on the first housing (31);

An arc-shaped groove (311) for avoiding the movement track of the contact end (21) of the moving contact (2) is formed in one side, facing the moving rotating shaft of the isolating switch, of the first shell (31);

The permanent magnets (32) comprise first permanent magnets (321) and second permanent magnets (322), the first permanent magnets (321) are arranged corresponding to first side walls (3111) of the arc-shaped grooves (311), and the second permanent magnets (322) are arranged corresponding to second side walls (3112) of the arc-shaped grooves (311);

the homopolar of the first permanent magnet (321) and the homopolar of the second permanent magnet (322) are oppositely arranged.

2. The arc extinguishing device according to claim 1, characterized in that the first permanent magnet (321) is a plate-like structure corresponding to the shape of the arc-shaped groove (311), the first side wall (3111) is provided with a first limit groove (3113), and the first permanent magnet (321) is embedded in the first limit groove (3113).

3. The arc extinguishing device according to claim 2, characterized in that: the second permanent magnet (322) is of a plate-shaped structure corresponding to the shape of the arc-shaped groove (311); the second side wall (3112) is provided with a second limit groove (3114), and the second permanent magnet (322) is embedded in the second limit groove (3114).

4. The arc suppressing apparatus according to claim 3, wherein: the notch of the first limit groove (3113) and the notch of the second limit groove (3114) are opposite to the notch of the arc-shaped groove (311).

5. The arc suppressing apparatus according to claim 4, wherein: the notches of the first limiting groove (3113) and the second limiting groove (3114) are provided with first ribs (313) extending outwards.

6. The arc suppressing apparatus according to claim 5, wherein: the first protruding rib (313) comprises an arc rib (3131) which is matched with the notch long direction of the first limit groove (3113) and the second limit groove (3114).

7. The arc suppressing apparatus according to claim 5, wherein: the first protruding ribs (313) comprise vertical ribs (3132) corresponding to two ends of the notch of the first limiting groove (3113) and the second limiting groove (3114).

8. The arc suppressing apparatus according to claim 4, wherein: the outer surfaces of the first side wall (3111) and the second side wall (3112) are provided with positioning bosses (3115), and one side of the positioning bosses (3115) facing the moving contact is provided with a second convex rib (314).

9. The arc suppressing apparatus according to claim 4, wherein: the first shell (31) is made of gas generating materials.

10. A switching unit comprising: the device comprises a unit shell (5), at least one pair of fixed contacts (1) arranged in the unit shell (5), a moving contact (2) rotatably arranged in the unit shell (5) and an arc extinguishing device (3) arranged at the edge of a moving track of the moving contact (2) and close to the fixed contacts (1), and is characterized in that the arc extinguishing device (3) is the arc extinguishing device according to any one of claims 1-9.

11. The switching unit according to claim 10, wherein: the section of unit casing (5) becomes the rectangle, including a pair of first lateral wall that set up relatively, and a pair of second lateral wall that set up relatively, moving contact (2) set up in the middle part region of unit casing (5), a pair of stationary contact (1) set up in the middle part of a pair of first lateral wall relatively, moving contact (2) are in when separating brake position, contact end (21) at moving contact (2) both ends correspond the middle part of a pair of second lateral wall respectively, moving contact (2) are in when closing brake position, contact end (21) at moving contact (2) both ends contact with a pair of stationary contact (1) respectively, two arc extinguishing device (3) are located the tip angle department of rectangle, correspond the motion trail of contact end (21) at moving contact (2) both ends respectively.

12. The switching unit according to claim 11, wherein: the main body of the moving contact (2) is closed through an arc isolation cover (70), only contact ends (21) at two ends are exposed, the arc isolation cover (70) comprises an upper arc isolation cover (71) and a lower arc isolation cover (72), the upper arc isolation cover (71) and the lower arc isolation cover (72) clamp the main body of the moving contact (2) in the main body, and the contact ends (21) of the moving contact (2) extend out of the outer sides of the upper arc isolation cover (71) and the lower arc isolation cover (72).

13. A rotary isolation switch, comprising: a rotary handle, an operating mechanism unit and one or more switch units which are stacked in sequence, characterized in that the switch unit is a switch unit according to any one of claims 10-12.