CN210110658U

CN210110658U - Contactor arc extinguishing system

Info

Publication number: CN210110658U
Application number: CN201920968271.4U
Authority: CN
Inventors: 于贻鹏; 王龙江; 李冰
Original assignee: Shanghai Liangxin Electrical Co Ltd
Current assignee: Shanghai Liangxin Electrical Co Ltd
Priority date: 2019-06-25
Filing date: 2019-06-25
Publication date: 2020-02-21
Anticipated expiration: 2029-06-25

Abstract

A contactor arc extinguishing system comprising a set of bridge type main contact systems (a, a') connected in parallel, characterized in that: an arc contact system (B) is arranged between the parallel group of bridge type main contact systems (A, A'). The arc contact mode is adopted, the size of the end part of the arc contact is very small, the arc contact can move in a narrow cavity formed by the leg part and the belly part of the arc extinguishing grid piece, and meanwhile, the gas generating pieces are arranged on two sides inside the leg part of the arc extinguishing grid piece, so that the moving speed of an electric arc is accelerated. The arrangement direction of the grid pieces is consistent with the movement direction of the arc contact, so that more grid pieces can be arranged, and higher arc voltage can be obtained. Meanwhile, the static arc root directly enters the belly area of the arc extinguish chamber through the static contact plate, and the time of the arc entering the belly of the arc extinguish grid piece is shortened.

Description

Contactor arc extinguishing system

Technical Field

The utility model belongs to the technical field of the contactor, specifically say so and relate to a contactor arc extinguishing system of contactor.

Background

With the development of photovoltaic and energy storage systems, the voltage of a direct current system is higher and higher, which puts higher requirements on the capability of a direct current switching device matched with the photovoltaic and energy storage system to open and close a circuit. The key point of the successful circuit breaking of the direct current switch device is that the arc voltage is required to be high enough, the arc moving speed is high, and the arc voltage and the moving speed can not meet the requirements in the prior art.

Chinese publication No. CN208873 discloses a high-load ac contactor, which includes a base, an insulating base plate, a contact support, a static iron core and a moving iron core mounted on the base, a guide rod embedded in the contact support, a main static contact mounted on the insulating base plate, and a driving contact mounted on the guide rod, and is characterized in that a static arc contact is further mounted on the insulating base plate, a moving arc contact corresponding to the static arc contact is further mounted on the guide rod, the gap between the static arc contact and the moving arc contact is smaller than the gap between the main static arc contact and the moving arc contact, and an arc extinguishing resistor is further mounted on the insulating base plate, both ends of which are respectively connected with the main static contact and the static arc contact through soft coupling. By utilizing the characteristic that the arc contacts are closed first and then opened, a loop is connected into a large resistor in series to share a part of circuit voltage drop when the arc contacts are connected and opened, so that the voltage born between the contacts is greatly reduced, and the arc between the contacts is easier to extinguish. But the contact is too big among this patent technique, and the contact all moves at the explosion chamber outside, and quiet arc root motion route is for transferring to the striking plate from quiet touch panel, then gets into the chamber belly region that extinguishes, and the motion trail is long, is unfavorable for electric arc to extinguish fast.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a contactor arc extinguishing system, has faster electric arc velocity of motion and higher arc pressure to the technical defect that arc extinguishing system arc extinguishing speed is slow of above-mentioned current contactor. Meanwhile, the static arc root directly enters the belly area of the arc extinguish chamber through the static contact plate, so that the time of the arc entering the belly of the arc extinguish grid piece is shortened, and the arc extinguishing speed is accelerated.

Technical scheme

In order to realize the technical purpose, the utility model provides a pair of contactor arc extinguishing system, including parallelly connected a set of bridge type main contact system, its characterized in that: and an arc contact system is arranged between the parallel bridge type main contact systems.

Furthermore, the group of bridge-type main contact systems and the arc contact systems which are connected in parallel form a three-contact bridge six-breakpoint structure, and the opening distance of the arc contact system is smaller than that of the group of bridge-type main contact systems which are connected in parallel. By adopting the structure, the arc contact is closed and then separated compared with the main contact, the arc is started on the arc contact, and the arc is extinguished by utilizing the arc contact and the arc contact.

Furthermore, the moving track of the moving arc silver contact on the moving arc contact of the arc contact system is positioned in a concave cavity in an arc extinguishing chamber in the arc extinguishing system in the switching-on and switching-off process. By adopting the structure, higher arc voltage can be obtained, and the time of the arc entering the belly of the arc-extinguishing grid piece is shortened.

Furthermore, the moving arc contact of the arc contact system is linked with the moving main contacts of the group of bridge type main contact systems' which are connected in parallel by an arc contact linkage mechanism.

Furthermore, the movable main contacts of the group of bridge-type main contact systems connected in parallel are connected by a main contact linkage mechanism.

Furthermore, the arc striking surface of the movable arc contact of the arc contact system is an inclined surface, and an included angle formed by the arc striking surface of the movable arc contact and the static arc contact is an acute angle. By adopting the structure, the arc striking inclined plane is convenient for the electric arc to move quickly, the electric arc is elongated quickly, and the voltage rising speed of the electric arc is high.

Further, arc contact link gear is including moving arc contact, elastic component, locating part, guide part and gangbar, the gangbar passes the guide way on the arc contact moves, the guide part dress is in on the gangbar of guide way both sides, be equipped with the locating part on the gangbar in the two outsides of guide part and be used for limiting the guide part displacement, elastic component one end is placed on the locating piece of guide way bottom, the other end is hung on the protruding muscle that stretches out on the guide part. This arc contact link gear simple structure, occupation space is few, has reserved a large amount of spaces for arc extinguishing chamber of arc contact complex, and the moving arc contact can extend to the grid inside simultaneously, can obtain higher arc pressure and arc blowing power to promote the disconnected electric arc performance of product.

Furthermore, the convex rib extends into the guide groove to enable the elastic piece to be in a linear state.

Further, the movable arc contact comprises a connecting portion and a contact portion, the guide groove is formed in the connecting portion, and the contact portion is W-shaped.

Furthermore, the bottom of the guide piece is also provided with a limiting part, and the part of the limiting part extending into the guide groove B103 can be in contact with the inner wall of the guide groove to limit the swing of the moving arc contact.

Further, the explosion chamber includes a plurality of arc extinguishing bars and striking grids, a plurality of arc extinguishing bars include the grid body, a pair of grid shank is stretched out to the belly of grid body, the belly and a pair of grid shank of grid body enclose into the cavity. The concave cavity can strengthen the arc blowing magnetic field between the moving contact and the static contact, and is favorable for accelerating the movement of the electric arc.

Further, an insulating part is arranged on one side, located at the concave cavity, of the pair of grid plate leg parts.

Preferably, the insulating member is made of a gas generating material.

Preferably, the arc striking grid pieces are positioned at the top ends of the arc extinguishing grid pieces, the arc striking grid pieces are positioned at the concave cavity and extend out of the arc striking angle, the arc striking angle is a C-shaped bending part, and the C-shaped bending part corresponds to the sharp corner of the moving arc contact. The C-shaped bending part of the arc striking grid sheet is beneficial to forming a strong electric field at the sharp angle of the arc contact, and is beneficial to striking an arc.

Preferably, the arc chute pieces are arranged in a stepped manner.

Furthermore, the main contact linkage mechanism comprises a support, a main contact spring support is arranged in the inner cavity of the support, a support arm of the main contact spring support penetrates out of a slotted hole in the bottom of the inner cavity of the support and extends into the movable main contact, a spring is arranged in the mounting cavity of the main contact spring support, one end of the spring abuts against the bottom of the mounting cavity, the other end of the spring abuts against the bottom of the inner cavity of the support, the movable main contact is arranged on the upper end face of the support, the end of a linkage rod is arranged in a mounting hole in the support arm in the movable main contact, and a reed is arranged in the movable main contact and pressed by the linkage rod.

Preferably, the elastic member is a compression spring.

Preferably, the limiting member is a snap spring.

Further, the width of the movable arc silver contact on the movable arc contact is less than 40% of the width of the movable silver point on the movable main contact.

Advantageous effects

The utility model provides a pair of contactor arc extinguishing system adopts the arc contact mode, and arc contact tip size is very little, can move in the narrow cavity of arc extinguishing bars piece shank and belly formation, and the inside both sides installation of arc extinguishing bars piece shank produces the gas spare simultaneously for the electric arc moving speed. The arrangement direction of the grid pieces is consistent with the movement direction of the arc contact, so that more grid pieces can be arranged, and higher arc voltage can be obtained. Meanwhile, the static arc root directly enters the belly area of the arc extinguish chamber through the static contact plate, and the time of the arc entering the belly of the arc extinguish grid piece is shortened.

Drawings

FIG. 1 is a product diagram of an embodiment of the present invention;

fig. 2 is an exploded schematic view of an embodiment of the present invention;

figure 3 is a product drawing of a contact system in an embodiment of the invention;

figure 4 is an exploded view of a contact system in an embodiment of the invention;

figure 5 is a schematic view of an installation of an arcing contact system in an embodiment of the invention;

fig. 6 is a schematic structural view of an arcing contact linkage mechanism according to an embodiment of the present invention;

fig. 7 is an exploded view of an arcing contact linkage mechanism in an embodiment of the present invention;

FIG. 8 is a schematic view of a guide according to an embodiment of the present invention;

fig. 9 is a schematic structural view of a moving arc contact according to an embodiment of the present invention;

fig. 10 is a schematic structural view of a bracket according to an embodiment of the present invention;

fig. 11 is a schematic structural view of a main contact spring holder according to an embodiment of the present invention;

fig. 12 is a schematic diagram of the positions of the arc extinguishing chamber and the moving arc contact according to the embodiment of the present invention.

Fig. 13 is a schematic structural diagram of an arc striking grid in an embodiment of the present invention.

Detailed Description

The present invention will be further explained with reference to the drawings and examples.

Examples

As shown in fig. 1 and 2, the arc extinguishing system of the contactor comprises a group of bridge-type main contact systems a and a 'which are connected in parallel, and an arc contact system B is arranged between the group of bridge-type main contact systems a and a' which are connected in parallel. The main contact systems A and A ', the arc contact system B and the arc extinguish chamber C are all positioned in an arc extinguish chamber, a group of bridge type main contact systems A and A ' which are connected in parallel and the arc contact system B form a three-contact-bridge six-breakpoint structure, and the opening distance of the arc contact system B is smaller than that of the group of bridge type main contact systems A and A ' which are connected in parallel. And the moving track of the moving arc silver contact B101 at the two ends of the moving arc contact B1 of the arc contact system B in the opening and closing process is positioned in a concave cavity C1 in an arc extinguishing chamber C in the arc extinguishing system. In this embodiment, the width of the moving arc silver contact B101 on the moving arc contact B1 is less than 40% of the width of the moving arc silver contact A1, A1B, A1B 'on the moving arc contact A1, A1'. The arc striking surface B102 of the moving arc contact B1 of the arc contact system B is an inclined surface, and the included angle formed by the arc striking surface B102 of the moving arc contact B1 and the static arc contact B3 is an acute angle. In detail, the moving arc contact B1 includes a connecting portion B104 and a contact portion B105, and the contact portion B105 has a W shape. The arc striking surface B102 is a W-shaped outer side surface.

As shown in fig. 3, 4, 10 and 11, the movable main contacts a1, a1 'of the parallel group of bridge-type main contact systems a, a' are connected by a main contact linkage mechanism a 2. The main contact linkage mechanism A2 comprises a bracket A201, a main contact spring bracket A202 is arranged in the inner cavity of the bracket A201, a bracket arm A202a of the main contact spring bracket A202 penetrates out of a slotted hole A201a at the bottom of the inner cavity of the bracket A201 and extends into a movable main contact A1 and A1 ', a spring A203 is arranged in a mounting cavity A202B of the main contact spring bracket A202, one end of the spring is abutted against the bottom of a mounting cavity A202B, the other end of the spring is abutted against the bottom of the inner cavity of the bracket A201, the movable main contacts A1 and A1' are arranged on the upper end surface of the bracket A201, the end of a linkage rod B204 is arranged in a mounting hole A202a01 on the bracket arm A202a in the movable main contacts A1 and A1 ', and the reed A204 is arranged in the movable main contacts A1 and A1' and is pressed by the linkage rod B204.

As shown in fig. 5, the moving arcing contact B1 of the arcing contact system B is linked to the moving main contacts a1, a1 'of the set of bridge-type main contact systems a, a' connected in parallel by an arcing contact linkage B2. As shown in fig. 6 and 7, the arcing contact linkage mechanism B2 includes a moving arcing contact B1, an elastic member B201, a limiting member B202, a guide member B203, and a linkage rod B204, in this embodiment, the elastic member B201 is a compression spring, and the limiting member B202 is a snap spring. The linkage rod B204 penetrates through a guide groove B103 on the moving arcing contact B1, the guide piece B203 is arranged on the linkage rod B204 on two sides of the guide groove B103, limiting pieces B202 are arranged on the linkage rod B204 on two outer sides of the guide piece B203 and used for limiting the displacement of the guide piece B203, one end of the elastic piece B201 is placed on a positioning block B103a at the bottom of the guide groove B103, and the other end of the elastic piece B201 is hung on a convex rib B203a extending out of the guide piece B203. The rib B203a extends into the guide groove B103 to make the elastic member B201 in a linear state. In detail, as shown in fig. 9, the moving arc contact B1 includes a connecting portion B104 and a contact portion B105, and the guide groove B103 is provided on the connecting portion B104. As shown in fig. 8, the bottom of the guide B203 is further provided with a limiting portion B203B, and a portion of the limiting portion B203B extending into the guide groove B103 can contact with the inner wall of the guide groove B103 to limit the swing of the moving arc contact B1.

As shown in fig. 12 and 13, the arc extinguishing chamber C includes a plurality of arc extinguishing grids C2 and an arc striking grid C3, and the plurality of arc extinguishing grids C2 are arranged in a stepped manner. The arc extinguishing grid plates C2 comprise a grid plate body C201, a pair of grid plate legs C202 and C202 'extend out of the belly of the grid plate body C201, and a concave cavity C1 is surrounded by the belly of the grid plate body C201 and the pair of grid plate legs C202 and C202'. The pair of gate leg portions C202, C202' are provided with an insulating member C4 on a side of the cavity C1. In this embodiment, the insulating member C4 is made of a gas generating material, the arc striking grid piece C3 is located at the top end of the arc extinguishing grid pieces C2, the arc striking grid piece C3 is located at the concave cavity C1 and extends out of an arc striking angle C3a, the arc striking angle C3a is a C-shaped bending portion, and the C-shaped bending portion corresponds to a sharp corner of the moving arc contact B1.

When the magnetic system is electrified, the bracket A201 is firstly driven to move towards the static contact side of the arc extinguishing system, meanwhile, the bracket A201 drives the linkage rod B204 to move towards the static contact side through the spring A203 and the main contact spring bracket A202, and then the moving arc contact B1 moves towards the corresponding static arc contact B1'. The contact surfaces of the movable arc silver contact B101 of the movable main contacts A1 and A1 'and the movable arc contact B1 close to the fixed contact side are on the same plane, and the gap between the silver points of the movable main contacts A1 and A1' and the silver points of the fixed contact A1 'and A1' is larger than the gap between the silver points of the movable arc contact B1 and the silver points of the fixed arc contact B3. When the linkage rod B204 drives the movable main contact A1, the A1 'and the movable arc contact B1 move towards the side close to the static contact A1', and the A1 'moves, the movable arc contact B1 and the static arc contact B3 are earlier than the movable main contact A1, the A1' is contacted with the static contact A1 'and the A1', the linkage rod B204 drives the movable main contact A1, the A1 'and the movable arc contact B1 move towards the side far from the static contact A1', and the A1 ', the movable arc contact B1 and the static arc contact B3 are later than the movable main contact A1, and the A1' is separated from the static contact A1 'and the A1'.

The structure, proportion, size, quantity, etc. shown in the attached drawings of the embodiment of the present invention are only used for matching with the contents disclosed in the specification, so as to be known and read by people familiar with the art, not for limiting the limit conditions that the present invention can be implemented, so that the present invention has no technical essential meaning, and the modification of any structure, the change of proportion relation or the adjustment of size should still fall within the range that the technical contents can be covered without affecting the function that the present invention can produce and the purpose that can be achieved. Meanwhile, the terms such as "upper", "lower", "left", "right", "middle", "clockwise", "counterclockwise", etc. used in the present specification are for the sake of clarity only, and are not intended to limit the scope of the present invention, and changes or adjustments of the relative relationship thereof are considered to be the scope of the present invention without substantial changes in the technical content.

Claims

1. A contactor arc extinguishing system comprising a set of bridge type main contact systems (a, a') connected in parallel, characterized in that: an arc contact system (B) is arranged between the parallel group of bridge type main contact systems (A, A').

2. The contactor arc quenching system as claimed in claim 1, wherein: the parallel group of bridge type main contact systems (A, A ') and the arc contact system (B) form a three-contact bridge six-breakpoint structure, and the opening distance of the arc contact system (B) is smaller than that of the parallel group of bridge type main contact systems (A, A').

3. The contactor arc quenching system as claimed in claim 1, wherein: and the moving track of the moving arc silver contact (B101) on the moving arc contact (B1) of the arc contact system (B) is positioned in a cavity (C1) in an arc extinguishing chamber (C) in the arc extinguishing system in the opening and closing process.

4. The contactor arc quenching system as claimed in claim 1, wherein: the moving arcing contact (B1) of the arcing contact system (B) is linked with the moving main contacts (A1, A1 ') of the parallel group of bridge type main contact systems (A, A') by an arcing contact linkage mechanism (B2).

5. The contactor arc quenching system as claimed in claim 1, wherein: the movable main contacts (A1, A1 ') of the parallel group of bridge type main contact systems (A, A') are connected by a main contact linkage mechanism (A2).

6. The contactor arc quenching system as claimed in claim 1, wherein: the arc striking surface (B102) of the movable arc contact (B1) of the arc contact system (B) is an inclined surface, and an included angle formed by the arc striking surface (B102) of the movable arc contact (B1) and the static arc contact (B3) is an acute angle.

7. The contactor arc quenching system as claimed in claim 4, wherein: the arc contact linkage mechanism (B2) comprises a moving arc contact (B1), an elastic piece (B201), a limiting piece (B202), a guide piece (B203) and a linkage rod (B204), wherein the linkage rod (B204) penetrates through a guide groove (B103) in the moving arc contact (B1), the guide piece (B203) is arranged on the linkage rods (B204) on two sides of the guide groove (B103), the limiting piece (B202) is arranged on the linkage rod (B204) on two outer sides of the guide piece (B203) and used for limiting the displacement of the guide piece (B203), one end of the elastic piece (B201) is placed on a positioning block (B103a) at the bottom of the guide groove (B103), and the other end of the elastic piece (B201) is hung on a convex rib (B203a) extending out of the guide piece (B203).

8. The contactor arc quenching system as claimed in claim 7, wherein: the convex rib (B203a) extends into the guide groove (B103) to enable the elastic piece (B201) to be in a linear state.

9. The contactor arc quenching system as claimed in claim 7, wherein: the moving arc contact (B1) comprises a connecting part (B104) and a contact part (B105), the guide groove (B103) is arranged on the connecting part (B104), and the contact part (B105) is W-shaped.

10. The contactor arc quenching system as claimed in claim 7, wherein: the bottom of the guide piece (B203) is also provided with a limiting part (B203B), and the part of the limiting part (B203B) extending into the guide groove (B103) can be in contact with the inner wall of the guide groove (B103) to limit the swing of the moving arc contact (B1).

11. The contactor arc quenching system as claimed in claim 3, wherein: arc extinguishing chamber (C) includes a plurality of arc extinguishing bars piece (C2) and striking grid piece (C3), a plurality of arc extinguishing bars piece (C2) are including grid piece body (C201), a pair of grid piece shank (C202, C202 ') are stretched out to the belly of grid piece body (C201), the belly and a pair of grid piece shank (C202, C202') of grid piece body (C201) enclose into cavity (C1).

12. The contactor arc quenching system as claimed in claim 11, wherein: the pair of gate leg portions (C202, C202') are provided with an insulating member (C4) at one side of the cavity (C1).

13. The contactor arc quenching system as claimed in claim 12, wherein: the insulating piece (C4) is made of gas generating material.

14. The contactor arc quenching system as claimed in claim 11, wherein: the arc striking grid piece (C3) is located the top of a plurality of arc extinguishing grid pieces (C2), arc striking grid piece (C3) is located cavity (C1) and stretches out arc striking angle (C3a), arc striking angle (C3a) is the C shape portion of bending, the C shape portion of bending is corresponding with the closed angle of moving arc contact (B1).

15. The contactor arc quenching system as claimed in claim 11, wherein: the arc extinguishing grid plates (C2) are arranged in a stepped mode.

16. The contactor arc quenching system as claimed in claim 5, wherein: the main contact linkage mechanism (A2) comprises a bracket (A201), a main contact spring bracket (A202) is arranged in the inner cavity of the bracket (A201), a bracket arm (A202a) of the main contact spring bracket (A202) penetrates out of a slotted hole (A201a) at the bottom of an inner cavity of the bracket (A201) and extends into a main contact (A1, A1'), a spring (A203) is arranged in a mounting cavity (A202b) of the main contact spring bracket (A202), one end of the spring (A203) is propped against the bottom of the mounting cavity (A202b), the other end of the spring (A203) is propped against the bottom of the inner cavity of the bracket (A201), the movable main contacts (A1, A1 ') are arranged on the upper end face of the bracket (A201), the end of the linkage rod (B204) is arranged in a mounting hole (A202a01) on a bracket arm (A202a) in the movable main contacts (A1, A1 '), and the reed (A204) is arranged in the movable main contacts (A1, A1 ') and pressed by the linkage rod (B204).

17. The contactor arc quenching system as claimed in claim 7, wherein: the elastic piece (B201) is a compression spring.

18. The contactor arc quenching system as claimed in claim 7, wherein: the limiting piece (B202) is a clamp spring.

19. A contactor arc quenching system as claimed in claim 3, 4 or 7, wherein: the width of the movable arc silver contact (B101) on the movable arc contact (B1) is less than 40% of the width of the movable arc silver contact (A1B, A1B ') on the movable main contact (A1, A1').