Circuit breaker with metal particle blocking structure

Abstract

The utility model discloses a circuit breaker with a metal particle blocking structure, which comprises a shell, the shell comprises an arc extinguish chamber and a transmission chamber connected with the arc extinguish chamber, a static contact is arranged in the arc extinguish chamber, a moving contact and a rotating shaft are arranged in the transmission chamber, one end of the moving contact is arranged in the arc extinguish chamber and is matched with the static contact in an on-off manner, and the other end of the moving contact is matched with the rotating shaft in an on-off manner. The other end of the moving contact is in transmission connection with the rotating shaft, a sliding baffle is arranged at the joint of the transmission chamber and the arc extinguish chamber in a sliding mode, the sliding baffle comprises a through hole connected with the moving contact in a penetrating mode, and the moving contact can drive the sliding baffle to slide when swinging. The circuit breaker with the metal particle blocking structure has a better blocking effect on metal particles generated during arc extinguishing.

Description

Technical Field

[0001] The utility model relates to a circuit breaker with a metal particle blocking structure. Background Art

[0002] The arc extinguishing system of the existing molded case circuit breaker mainly relies on the arc extinguishing chamber grid to extinguish the arc. In the process of the grid cutting and cooling the arc, it is inevitably burned by the high energy of the arc and some metal particles are generated. The size of these metal particles is irregular and the movement trajectory is also irregular. The generated metal particles will fly into other mechanisms of the circuit breaker, thereby causing a series of problems. For example, when flying into the operating mechanism, it will cause the operating mechanism to get stuck, and the product cannot be opened and closed normally, affecting the operating characteristics. When flying into the moving contact and the rotating shaft of the contact system, it will cause the moving contact to get stuck, resulting in the problem of product non-conduction after test.

[0003] In order to solve the above problem, the means currently used in the prior art is to set an arc isolation plate between the arc extinguishing chamber and the moving contact, and a through groove for the moving contact to move is provided on the arc isolation plate, and the arc isolation plate can block a part of the metal particles.

[0004] For example, a DC circuit breaker arc extinguishing system (CN110148546A) disclosed in a Chinese invention patent application includes an arc extinguishing hood, which includes an arc-isolating plate covering the static contact, two insulating plates symmetrically arranged on both sides of the arc-isolating plate, and multiple grids, which are arranged between the two insulating plates along the track of the moving contact performing the opening and closing action, and a partition is provided on one side of the arc-isolating plate, and a card slot (i.e., a through slot) is provided on the partition, and the moving contact of the moving contact passes through the card slot and extends inside the arc-isolating plate. An arc-extinguishing space is formed between the partition and the arc-isolating plate, which can prevent the residual arc from jumping out of the arc-isolating plate, which is conducive to enhancing the arc-extinguishing effect.

[0005] For another example, a Chinese utility model patent discloses an arc interrupting device (CN212322945U), which includes a second arc-isolating plate (i.e., a partition), and the structure of the second arc-isolating plate is a U-shaped structure, and an open groove (i.e., a through groove) is provided in the middle of the second arc-isolating plate, and the open groove is sleeved in the middle of the contact. When the switch is opened, the second arc-isolating plate and the arc-extinguishing chamber form a relatively closed cavity, and the breaking gas pressure generated by the closed cavity is used to accelerate the arc to enter the arc-extinguishing chamber cavity for arc extinguishing, thereby effectively improving the arc extinguishing ability of the circuit breaker, and preventing the high-pressure gas generated by the arc from spraying toward the outlet terminal.

[0006] In the above patent documents, the arc isolation plate has a certain blocking effect on the metal particles generated during arc extinguishing, but there is still a large gap between the arc isolation plate slot and the moving contact, and the metal particles will fly along the arc isolation plate slot into other mechanisms of the circuit breaker and affect them. Since the moving contact needs to have a certain left and right offset and swing amplitude, and the length and width of the partition slot need to match the movement amplitude of the moving contact, otherwise it will cause assembly problems such as the inability to open and close the contact, offset interference, etc. Due to this limitation, the length and width of the partition slot cannot be made very small, which has a certain blocking effect on metal particles with larger particle sizes, but cannot reliably protect metal particles with smaller particle sizes. Summary of the invention

[0007] The utility model provides a circuit breaker with a metal particle blocking structure, which has a better blocking effect on metal particles generated during arc extinguishing.

[0008] The utility model discloses a circuit breaker with a metal particle blocking structure, comprising a shell, the shell comprising an arc extinguishing chamber, a transmission chamber connected with the arc extinguishing chamber, a static contact is arranged in the arc extinguishing chamber, a moving contact and a rotating shaft are arranged in the transmission chamber, one end of the moving contact is placed in the arc extinguishing chamber and cooperates with the static contact in the arc extinguishing chamber for on-off operation, the other end of the moving contact is connected to the rotating shaft for transmission, the moving contact is driven to swing by the rotating shaft, and then the on-off connection with the static contact is realized, a sliding baffle is slidably arranged at the connection between the transmission chamber and the arc extinguishing chamber, the sliding baffle comprises a through hole connected with the moving contact, the sliding baffle is sleeved on the outer side of the moving contact through the through hole, a small gap is provided between the sliding baffle and the moving contact, the moving contact can drive the sliding baffle to slide when swinging, and the setting of the sliding baffle can improve the blocking effect on metal particles.

[0009] Furthermore, the connection between the transmission chamber and the arc extinguishing chamber has two oppositely arranged side walls and a bottom wall, and the two sides of the sliding baffle are respectively slidably connected to the two side walls.

[0010] Furthermore, a baffle wall is arranged between the lower end of the sliding baffle and the bottom wall of the connection. When the sliding baffle swings with the moving contact, a gap will be generated between the lower end and the bottom wall of the connection. The setting of the baffle wall can block the gap and prevent metal particles generated in the arc extinguishing chamber from passing through the gap.

[0011] Furthermore, guide grooves are correspondingly arranged on the two side walls of the connection, and the two side edges of the sliding baffle are respectively slidably connected to the guide grooves on the two side walls, which has a simple structure, is easy to install, and facilitates the manufacture of the sliding baffle.

[0012] Furthermore, a baffle wall is arranged between the lower end of the sliding baffle and the bottom wall of the connection, and the baffle wall is connected to the two side walls and the bottom wall of the connection, so as to further improve the blocking effect on metal particles. Convex walls are correspondingly arranged on the two side walls of the connection, and the guide groove is formed by the convex wall and the baffle wall, so that the sliding baffle can also slide along the surface of the baffle wall, thereby improving the sliding effect of the sliding baffle and reducing the gap between the baffle wall and the sliding baffle, thereby improving the blocking effect on metal particles.

[0013] Furthermore, the upper portion of the baffle wall includes a long groove for the moving contact to move through. When the moving contact swings, it moves along the long groove without interfering with the baffle wall. This design can increase the height of the baffle wall and improve the blocking effect on metal particles.

[0014] Furthermore, the long slot is provided with an opening at the upper end of the retaining wall, so as to facilitate the installation between the moving contact and the long slot.

[0015] Furthermore, the sliding baffle includes a narrow slit, one end of which is connected to the through hole, and the other end of the narrow slit is provided with an opening at the edge of the sliding baffle, and the elasticity of the sliding baffle material is utilized to deform the narrow slit, and the narrow slit is expanded, so that the moving contact can be conveniently inserted into the through hole along the expanded narrow slit. Since the widths of the two ends of the moving contact are usually relatively large, such a design can further reduce the size of the through hole, reduce the gap between the sliding baffle and the moving contact, and improve the blocking effect on metal particles.

[0016] Furthermore, the sliding baffle is made of a gas-generating material, and the sliding baffle can be injection molded from nylon PA66 material. The material has a gas-generating effect and has a certain elasticity, which can effectively play an arc-blowing role of gas blowing, and can quickly blow the arc generated during breaking into the arc extinguishing chamber, which can effectively reduce the energy of the arc during breaking, and thus can greatly reduce the burning degree of the contacts, shorten the arc burning time, improve the arc extinguishing effect, and improve the breaking capacity index.

[0017] The beneficial effects of the utility model are as follows: the sliding baffle and the moving contact are connected through a through hole, have a small gap, and can slide along with the swing of the moving contact; the structure is simple, and the barrier effect on metal particles can be improved, thereby ensuring the reliable operation of other mechanisms of the circuit breaker and extending the service life of the circuit breaker. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 The structure of the local embodiment of the utility model is shown in FIG. Figure 1 ;

[0019] Figure 2 It is a partial cross-sectional view of an embodiment of the utility model;

[0020] Figure 3A cross-sectional view of the entire embodiment of the utility model;

[0021] Figure 4 for Figure 3 A magnified view of part A;

[0022] Figure 5 The structure of the local embodiment of the utility model is shown in FIG. Figure 2 ;

[0023] Figure 6 for Figure 5 A magnified view of part B;

[0024] Figure 7 This is a schematic diagram of the assembly of the moving contact and the sliding baffle of the embodiment of the utility model;

[0025] In the figure: 1. shell; 11. arc extinguishing chamber; 12. transmission chamber; 131. side wall; 132. bottom wall; 133. guide groove; 134. convex wall; 21. static contact; 22. moving contact; 23. rotating shaft; 3. operating mechanism; 4. sliding baffle; 41. through hole; 42. narrow slit; 5. baffle wall; 51. long groove. DETAILED DESCRIPTION

[0026] The utility model provides an embodiment of a circuit breaker with a metal particle blocking structure, such as Figure 1-7 As shown, the housing 1 includes an arc extinguishing chamber 11 and a transmission chamber 12 connected to the arc extinguishing chamber 11. The arc extinguishing chamber 11 is provided with a static contact 21, and the transmission chamber 12 is provided with a moving contact 22 and a rotating shaft 23. One end of the moving contact 22 is placed in the arc extinguishing chamber 11 and cooperates with the static contact 21 in the arc extinguishing chamber 11 for switching. The other end of the moving contact 22 is connected to the rotating shaft 23 for transmission. The rotating shaft 23 is connected to the operating mechanism 3 of the circuit breaker. The moving contact 22 is driven to swing through the rotating shaft 23. The moving contact 22 is movable, thereby realizing the on-off connection with the static contact 21. A sliding baffle 4 is slidably arranged at the connection between the transmission chamber 12 and the arc extinguishing chamber 11. The sliding baffle 4 includes a through hole 41 which is connected with the moving contact 22. The sliding baffle 4 is sleeved on the outside of the moving contact 22 through its through hole 41. There is a small gap between the sliding baffle 4 and the moving contact 22. The moving contact 22 can drive the sliding baffle 4 to slide when swinging. The setting of the sliding baffle 4 can improve the blocking effect on metal particles.

[0027] like Figures 1 to 3 As shown, the connection between the transmission chamber 12 and the arc extinguishing chamber 11 has two oppositely disposed side walls 131 and a bottom wall 132 , and the two sides of the sliding baffle 4 are respectively slidably connected to the two side walls 131 .

[0028] Furthermore, a baffle wall 5 is arranged between the lower end of the sliding baffle 4 and the bottom wall 132 of the connection, and the baffle wall 5 is connected to the two side walls 131 and the bottom wall 132 of the connection, so as to improve the blocking effect on metal particles. When the sliding baffle 4 swings and moves upward with the moving contact 22, a gap will be generated between its lower end and the bottom wall 132 of the connection. The setting of the baffle wall 5 can block the gap and prevent the metal particles generated in the arc extinguishing chamber 11 from entering the transmission chamber 12 along the gap.

[0029] The two side walls 131 of the connection are correspondingly provided with guide grooves 133, and the two side edges of the sliding baffle 4 are respectively slidably connected with the guide grooves 133 on the two side walls 131, which has a simple structure, is easy to install, and is convenient for manufacturing the sliding baffle 4. In other embodiments, the guide grooves 133 can also be provided on both sides of the baffle 4, and convex ribs can be provided on the two side walls 131 to realize the sliding connection of the sliding baffle 4.

[0030] In this embodiment, convex walls 134 are correspondingly arranged on the two side walls 131 of the connection, and the guide groove 133 is formed by the convex wall 134 and the baffle wall 5, so that the sliding baffle 4 can also slide along the surface of the baffle wall 5, thereby improving the sliding effect of the sliding baffle 4, and can also reduce the gap between the baffle wall 5 and the sliding baffle 4, thereby improving the blocking effect on metal particles.

[0031] It should be noted that, since the moving contact 22 needs to have a certain left-right offset, in actual application, the sliding baffle 4 can also move slightly left-right along the guide groove 133. Through the guiding effect of the guide groove 133, the sliding baffle 4 can be driven by the moving contact 22 to slide up and down in the vertical direction, but the moving contact 22 is in swinging motion. In order to avoid the sliding of the sliding baffle 4 and the swinging of the moving contact 22 from being blocked, the sliding baffle 4 is designed to be able to slide along the length direction of the moving contact 22.

[0032] The upper part of the baffle wall 5 includes a long slot 51 for the movable contact 22 to move through. When the movable contact 22 swings, it moves up and down along the long slot 51 without interfering with the baffle wall 5. This design can increase the height of the baffle wall 5 and improve the blocking effect on metal particles. Since the movable contact 22 needs to have a certain left and right deviation range, the width of the long slot 51 is greater than the width of the movable contact 22, so that the movable contact 22 can move in the width direction of the long slot 51.

[0033] The long slot 51 is provided with an opening at the upper end of the retaining wall 5 , and the moving contact 22 can be inserted into the long slot 51 along the opening, so that the moving contact 22 and the long slot 51 are conveniently installed.

[0034] The sliding baffle 4 includes a narrow slit 42, one end of which is connected to the lower end of the through hole 41, and the other end of the narrow slit 42 is provided with an opening at the lower edge of the sliding baffle 4. The narrow slit 42 is linear, and the elasticity of the sliding baffle 4 material is utilized to deform the narrow slit 42, and the narrow slit 42 is expanded, so that the moving contact 22 can be conveniently inserted and installed into the through hole 41 along the expanded narrow slit 42. Since the width of the moving contact 22 in this embodiment is smaller than its height, the narrow slit 42 with this shape and position distribution can reduce the elasticity requirements of the sliding baffle 4 material, and the moving contact 22 can be placed in the through hole 41 through slight deformation, which makes installation more convenient. Since the widths of the two ends of the moving contact 22 are usually relatively large (refer to Figure 7 ), such an assembly structure design can further reduce the size of the through hole 41, reduce the gap between the sliding baffle 4 and the moving contact 22, and improve the blocking effect on metal particles.

[0035] The sliding baffle 4 is made of a gas-generating material, for example, the sliding baffle 4 can be injection-molded from nylon PA66 material, which has a gas-generating effect and a certain elasticity, and can effectively play an arc-blowing role of air blowing, and can quickly blow the arc generated during breaking into the arc extinguishing chamber 11, which can effectively reduce the energy of the arc during breaking, and thus can greatly reduce the burning degree of the contacts, shorten the arc burning time, improve the arc extinguishing effect, and improve the breaking capacity index.

[0036] The above embodiment is only one of the preferred specific embodiments of the present invention. The common changes and substitutions made by those skilled in the art within the technical solution of the present invention are all included in the protection scope of the present invention.

Claims

1. A circuit breaker with a metal particle blocking structure, comprising a housing, the housing comprising an arc extinguishing chamber, a transmission chamber connected to the arc extinguishing chamber, a static contact arranged in the arc extinguishing chamber, a moving contact and a rotating shaft arranged in the transmission chamber, one end of the moving contact is placed in the arc extinguishing chamber and cooperates with the static contact for on-off operation, and the other end of the moving contact is transmission-connected to the rotating shaft, characterized in that: A sliding baffle is slidably arranged at the connection between the transmission chamber and the arc extinguishing chamber. The sliding baffle comprises a through hole connected with the moving contact. The moving contact can drive the sliding baffle to slide when swinging.

2. A circuit breaker with a metal particle barrier structure according to claim 1, characterized in that: The connection between the transmission chamber and the arc extinguishing chamber has two oppositely arranged side walls and a bottom wall, and the two sides of the sliding baffle are respectively slidably connected to the two side walls.

3. A circuit breaker with a metal particle barrier structure according to claim 2, characterized in that: A baffle wall is arranged between the lower end of the sliding baffle and the bottom wall of the connection.

4. A circuit breaker with a metal particle barrier structure according to claim 2, characterized in that: The two side walls of the connection are correspondingly provided with guide grooves, and the two side edges of the sliding baffle are respectively slidably connected with the guide grooves on the two side walls.

5. A circuit breaker with a metal particle barrier structure according to claim 4, characterized in that: A baffle wall is arranged between the lower end of the sliding baffle plate and the bottom wall of the connection, the baffle wall is connected to the two side walls and the bottom wall of the connection, the two side walls of the connection are correspondingly provided with convex walls, and the guide groove is formed by the convex wall and the baffle wall.

6. A circuit breaker with a metal particle barrier structure according to claim 3 or 5, characterized in that: The upper part of the retaining wall includes a long groove for the moving contact to movably pass through.

7. A circuit breaker with a metal particle barrier structure according to claim 6, characterized in that: The long groove is provided with an opening at the upper end of the retaining wall.

8. The circuit breaker with a metal particle barrier structure according to claim 1, characterized in that: The sliding baffle comprises a narrow slit, one end of the narrow slit is connected to the through hole, and the other end of the narrow slit is provided with an opening at the edge of the sliding baffle.

9. The circuit breaker with a metal particle barrier structure according to claim 1, characterized in that: The sliding baffle is made of a gas-generating material.

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