Contact spring protection device of air circuit breaker

Abstract

The utility model relates to the technical field of circuit breakers, in particular to a contact spring protection device of an air circuit breaker, which comprises a static contact and a contact support, a moving contact fixing plate is arranged between the static contact and the contact support, and when the circuit breaker is in a closed state, a surrounding plate is connected to the inner side of a groove in a sliding manner. The moving contact fixing plate, the surrounding plate and the contact support integrally surround the contact spring body, when the circuit breaker is in an opening state, the spring force of the contact spring body abuts against the moving contact body, the moving contact body pushes the moving contact fixing plate to integrally slide through the guide rod and finally make contact with the limiting piece, at the moment, the surrounding plate slides out of the interior of the groove by more than half, and the moving contact spring body is in a closed state. When the contact spring body is not separated from the groove, the moving contact fixing plate, the surrounding plate and the contact support surround the contact spring body to prevent the particles from contacting with the contact spring body, so that an all-around protection effect is achieved, and the problem that the contact spring body is not comprehensively protected by the existing device is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of circuit breakers, in particular to a contact spring protection device of an air circuit breaker. Background Art

[0002] An air circuit breaker is a switch used in low-voltage power distribution networks. It is mainly used to distribute electrical energy and protect lines and power equipment from overload, undervoltage, short circuit, single-phase grounding and other faults. It is also used for infrequent starting of motors and overload and short circuit protection, thereby ensuring the safety of the power grid and equipment.

[0003] When the circuit breaker is in a short-circuit fault or is undergoing a short-circuit test, an arc will be generated between the moving and static contacts during the circuit breaker opening process. Due to the extremely large short-circuit current, the energy of the arc generated is also very large. In addition, the high temperature characteristics of the arc will cause the arc to form particles after cooling. The particles will move into the contact spring under a certain force, thereby damaging the contact spring.

[0004] At present, there is an existing contact spring protection device for air circuit breakers (such as patent number: CN212322944U), which discloses a contact spring protection device for air circuit breakers, including a moving contact, a contact support, and a contact spring, characterized in that: a static contact is provided at the bottom of the moving contact, and the rear end of the top of the moving contact is connected to the rear end of the contact support, and a bracket and a contact spring are provided in sequence from front to back between the front end of the contact support and the moving contact, one end of the bracket is connected to the top of the moving contact, the other end of the bracket is connected to one end of the spring, the other end of the spring is connected to the contact support, one end of the contact spring is connected to the top of the moving contact, and the other end of the contact spring is connected to the contact support. Compared with the prior art, the structure is simple and easy to process. A spring and a bracket are added on the basis of the existing contact support, and the spring drives the bracket to prevent particles from entering the contact spring when closing and opening the switch, which effectively reduces the degree of damage to the contact spring and realizes the protection of the contact spring.

[0005] However, during the implementation of the above technical solution, it was found that there were at least the following technical problems:

[0006] 1. The existing device uses a bracket to block the particles, and a first groove is provided on the bracket, and a second groove is provided on the contact support. This method can indeed block particles and protect the contact spring. However, there is a problem that the cooperation between the bracket and the second groove can only block particles at the front end of the moving contact. There is no blocking device for particles on both sides of the moving contact. The particles can enter the contact spring through the gap between the moving contact and the two sides of the contact support, thereby damaging the contact spring. In other words, the existing device does not fully protect the contact spring.

[0007] 2. The existing device needs to open multiple first grooves and second grooves on the bracket and the contact support, and needs to set another spring on the basis of the contact spring that has been set. The existing device also needs to set multiple first protrusions and first protrusions. Therefore, the existing device has the problem of complex structure and difficult production. Utility Model Content

[0008] 1. Technical issues to be resolved

[0009] In view of the deficiencies of the prior art, the utility model provides a contact spring protection device for an air circuit breaker, which solves the technical problem that the prior device does not fully protect the contact spring.

[0010] (II) Technical solution

[0011] In order to achieve the above objectives, the present invention is implemented through the following technical solutions:

[0012] A contact spring protection device for an air circuit breaker comprises a stationary contact and a contact support, wherein a moving contact fixing plate is arranged between the stationary contact and the contact support.

[0013] Preferably: the contact support is provided with a groove and a spring groove, and the groove is in a square shape.

[0014] Preferably: the contact support is fixedly connected with a guide rod, the number of the guide rods is four, and one end of the four guide rods away from the contact support is fixedly connected with a limiting member.

[0015] Preferably, the moving contact fixing plate is provided with four limiting holes, the four limiting holes are respectively slidably sleeved with four guide rods, and the limiting members are all located on a side of the moving contact fixing plate away from the contact support.

[0016] Preferably, a moving contact body is fixedly arranged at the center of the moving contact fixing plate, and the moving contact body is parallel and perpendicular to the spring slot.

[0017] Preferably: a surrounding plate is fixedly connected to one side of the moving contact fixing plate close to the contact support, and the surrounding plate is in a square shape.

[0018] Preferably, the surrounding plate is slidably connected to the groove, and the depth of the groove is greater than the height of the surrounding plate.

[0019] Preferably: one end of the moving contact body close to the contact support is fixedly connected to a contact spring body, the number of the contact spring bodies is two, the ends of the two contact spring bodies away from the moving contact body are both located on the inner side of the spring groove, and the ends of the two contact spring bodies away from the moving contact body are both fixedly connected to the contact support.

[0020] (III) Beneficial effects

[0021] 1. When the circuit breaker is in the closed state, the surrounding plate is slidably connected to the inner side of the groove, and the moving contact fixing plate, the surrounding plate and the contact support surround the contact spring body as a whole, thereby preventing particles from contacting the contact spring body and damaging the contact spring body in all directions, thereby playing a role in protecting the contact spring body in all directions. When the circuit breaker is in the open state, the spring force of the contact spring body supports the moving contact body, and the moving contact body pushes the moving contact fixing plate as a whole to slide through the guide rod, and finally contacts the limiter. At this time, the surrounding plate slides out of the groove for most of the time, but does not separate from the groove. At this time, the moving contact fixing plate, the surrounding plate and the contact support still surround the contact spring body, preventing particles from contacting the contact spring body, thereby playing a role in all directions of protection. The present application solves the problem of incomplete protection of the contact spring body by the existing device by setting the moving contact fixing plate, the surrounding plate and the contact support to form a structure with all-round protection function.

[0022] 2. The present application does not provide other springs on the basis of the contact spring body that has been provided. The spring force of the contact spring body holds the moving contact body, and the moving contact body pushes the moving contact fixing plate as a whole to slide through the guide rod and finally contacts the limiter. In addition to the groove and the spring groove, no other groove is provided, and the groove and the spring groove are not integrated and only one is provided, which solves the problem that the existing device needs to be provided with multiple grooves and protrusions, and the structure is complicated due to the need to provide additional springs. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The above description is only an overview of the technical solution of the utility model. In order to more clearly understand the technical means of the utility model and implement it according to the contents of the specification, the following is a detailed description of the preferred embodiments of the utility model in conjunction with the accompanying drawings.

[0024] Figure 1 It is a side structural diagram of the device of the utility model in the overall separated state;

[0025] Figure 2 It is a side structural diagram of the device of the utility model in the overall closed state;

[0026] Figure 3 It is a bottom view of the structure of the device of the utility model in the overall closed state;

[0027] Figure 4 This is an exploded side structural diagram of the moving contact assembly of the utility model;

[0028] Figure 5 This is an exploded bottom view of the structure of the moving contact assembly of the utility model.

[0029] Legend: 1. Stationary contact; 2. Contact support; 3. Moving contact fixing plate; 4. Guide rod; 5. Surrounding plate; 6. Contact spring body; 201. Groove; 202. Spring groove; 301. Moving contact body; 302. Limiting hole; 401. Limiting piece. DETAILED DESCRIPTION

[0030] The embodiment of the present application provides a contact spring protection device for an air circuit breaker, thereby effectively solving the problem that the existing device does not fully protect the contact spring.

[0031] like Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown, the technical solution in the embodiment of the present application effectively solves the technical problem that the existing device does not fully protect the contact spring. The overall idea is as follows:

[0032] In view of the problems existing in the prior art, the utility model provides a contact spring protection device for an air circuit breaker, comprising a stationary contact 1 and a contact support 2 , wherein a moving contact fixing plate 3 is arranged between the stationary contact 1 and the contact support 2 .

[0033] The contact support 2 is provided with a groove 201 and a spring groove 202 , and the groove 201 is in a square shape.

[0034] The contact support 2 is fixedly connected with a guide rod 4 . The number of the guide rods 4 is four. One end of the four guide rods 4 away from the contact support 2 is fixedly connected with a limiting member 401 .

[0035] The moving contact fixing plate 3 is provided with four limiting holes 302 , which are respectively slidably sleeved with four guide rods 4 , and the limiting members 401 are all located on the side of the moving contact fixing plate 3 away from the contact support 2 .

[0036] A moving contact body 301 is fixedly disposed at the center of the moving contact fixing plate 3 , and the moving contact body 301 is parallel to and perpendicular to the spring slot 202 .

[0037] A surrounding plate 5 is fixedly connected to one side of the moving contact fixing plate 3 close to the contact support 2, and the surrounding plate 5 is in a square shape.

[0038] The surrounding plate 5 is slidably connected to the groove 201 , and the opening depth of the groove 201 is greater than the height of the surrounding plate 5 .

[0039] One end of the moving contact body 301 close to the contact support 2 is fixedly connected to a contact spring body 6, and there are two contact spring bodies 6. One end of the two contact spring bodies 6 away from the moving contact body 301 is located on the inner side of the spring groove 202, and one end of the two contact spring bodies 6 away from the moving contact body 301 is fixedly connected to the contact support 2.

[0040] When the circuit breaker is in the closed state, the surrounding plate 5 is slidably connected to the inner side of the groove 201, and the moving contact fixing plate 3, the surrounding plate 5 and the contact support 2 surround the contact spring body 6 as a whole, thereby preventing particles from contacting the contact spring body 6 and damaging the contact spring body 6 in all directions, thereby playing a role in protecting the contact spring body 6 in all directions. When the circuit breaker is in the open state, the spring force of the contact spring body 6 supports the moving contact body 301, and the moving contact body 301 pushes the moving contact fixing plate 3 as a whole to slide through the guide rod 4, and finally contacts the limiter 401. At this time, the surrounding plate 5 slides out of the groove 201 for most of the time, but does not separate from the groove 201. At this time, the moving contact fixing plate 3, the surrounding plate 5 and the contact support 2 still surround the contact spring body 6, preventing particles from contacting the contact spring body 6, thereby playing a role in all directions. The present application solves the problem of incomplete protection of the contact spring body 6 by the existing device by setting the moving contact fixing plate 3, the surrounding plate 5 and the contact support 2.

[0041] Working principle:

[0042] In the first step, when the circuit breaker is in the closed state, the surrounding plate 5 is slidably connected to the inner side of the groove 201, and the moving contact fixing plate 3, the surrounding plate 5 and the contact support 2 surround the contact spring body 6 as a whole, thereby comprehensively preventing particles from contacting the contact spring body 6 and damaging the contact spring body 6, thereby playing a role in comprehensively protecting the contact spring body 6.

[0043] In the second step, when the circuit breaker is in the open state, the spring force of the contact spring body 6 holds the moving contact body 301, and the moving contact body 301 pushes the moving contact fixing plate 3 to slide as a whole through the guide rod 4, and finally contacts with the limiter 401. At this time, the surrounding plate 5 slides out of the groove 201 for most of the time, but does not separate from the groove 201. At this time, the moving contact fixing plate 3, the surrounding plate 5 and the contact support 2 still surround the contact spring body 6 to prevent particles from contacting the contact spring body 6, thereby playing an all-round protective role.

[0044] Finally, it should be noted that: Obviously, the above embodiments are only examples for clearly explaining the present invention, and are not intended to limit the implementation methods. For ordinary technicians in the relevant field, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived from this are still within the scope of protection of the present invention.

Claims

1. A contact spring protection device for an air circuit breaker, comprising a stationary contact (1) and a contact support (2), characterized in that: A moving contact fixing plate (3) is arranged between the stationary contact (1) and the contact support (2); the contact support (2) is provided with a groove (201) and a spring groove (202); the groove (201) is in the shape of a square; a surrounding plate (5) is fixedly connected to a side of the moving contact fixing plate (3) close to the contact support (2); and the surrounding plate (5) is in the shape of a square.

2. A contact spring protection device for an air circuit breaker according to claim 1, characterized in that: The contact support (2) is fixedly connected to a guide rod (4), the number of the guide rods (4) is four, and one end of the four guide rods (4) away from the contact support (2) is fixedly connected to a limiting member (401).

3. A contact spring protection device for an air circuit breaker according to claim 2, characterized in that: The movable contact fixing plate (3) is provided with a limiting hole (302), and four limiting holes (302) are provided. The four limiting holes (302) are respectively slidably sleeved with four guide rods (4), and the limiting members (401) are all located on a side of the movable contact fixing plate (3) away from the contact support (2).

4. A contact spring protection device for an air circuit breaker as claimed in claim 3, characterized in that: A moving contact body (301) is fixedly arranged at the center of the moving contact fixing plate (3), and the moving contact body (301) is parallel and perpendicular to the spring slot (202).

5. A contact spring protection device for an air circuit breaker as claimed in claim 4, characterized in that: The surrounding plate (5) is slidably connected to the groove (201), and the opening depth of the groove (201) is greater than the height of the surrounding plate (5).

6. A contact spring protection device for an air circuit breaker as claimed in claim 5, characterized in that: One end of the moving contact body (301) close to the contact support (2) is fixedly connected to a contact spring body (6), the number of the contact spring bodies (6) is two, the ends of the two contact spring bodies (6) away from the moving contact body (301) are both located on the inner side of the spring slot (202), and the ends of the two contact spring bodies (6) away from the moving contact body (301) are both fixedly connected to the contact support (2).

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