Arc extinguishing system of circuit breaker

Abstract

The utility model discloses an arc extinguishing system of a circuit breaker, which comprises a static contact, an arc extinguishing chamber and a static cover, the static contact is placed in the arc extinguishing chamber, and the static cover is assembled on the static contact so as to isolate the static contact from a grid plate of the arc extinguishing chamber. According to the arc extinguishing system of the circuit breaker, the static contact can be effectively protected by installing the static cover on the static contact, and the consistency of breaking tests is well improved.

Description

Technical Field

[0001] The utility model relates to a circuit breaker, and more specifically to an arc extinguishing system of the circuit breaker. Background Art

[0002] With the continuous increase in market demand, many customers have put forward higher requirements for the first-time pass rate of the breaking test of molded case circuit breakers. We focus on improving the overall breaking level of molded case circuit breakers, improving the consistency level of breaking tests, and creating greater economic and social value for customers.

[0003] However, the existing molded case circuit breakers do not provide adequate protection for the contacts, and the consistency of the breaking test is very poor. If comprehensive arc extinguishing protection is provided for the contacts, the cost will be extremely high. Utility Model Content

[0004] In view of the deficiencies in the prior art, the purpose of the utility model is to provide an arc extinguishing system for a circuit breaker which can well protect static contacts and has low cost.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: an arc extinguishing system of a circuit breaker, comprising a static contact and an arc extinguishing chamber, wherein the static contact is placed in the arc extinguishing chamber, and further comprising a static cover, wherein the static cover is assembled on the static contact to isolate the static contact from the grid of the arc extinguishing chamber.

[0006] As a further improvement of the utility model, the static cover includes a bottom plate and a side plate, the bottom plate is provided with a static contact mounting groove, and the side plate is fixedly mounted on the bottom plate to isolate the mounting groove from the grid of the arc extinguishing chamber.

[0007] As a further improvement of the utility model, two side panels are provided, which are respectively fixedly mounted on the left and right sides of the bottom plate relative to the mounting groove to form an air gathering structure with the bottom plate.

[0008] As a further improvement of the present invention, a hook structure is provided on the static cover, and when the static cover is mounted on the static contact, the hook structure can hook the side of the static contact to fix the static cover on the static contact.

[0009] As a further improvement of the utility model, a fixed protective baffle is provided on the static cover near the hook structure, the protective baffle is located on the side of the hook structure facing away from the hook portion, and the protective baffle is spaced apart from the hook structure.

[0010] As a further improvement of the utility model, a groove for installing external magnetic blowing parts is opened at the bottom of the bottom plate, and an arc-shaped side plate is fixed on the side of the bottom plate away from the hook structure.

[0011] As a further improvement of the utility model, a detachable dust cover is provided on the top of the arc extinguishing chamber.

[0012] As a further improvement of the utility model, the dust cover includes an end baffle and a side baffle, one side of the end baffle is fixed to one side of the side baffle, so that when the dust cover is installed on the arc extinguishing chamber, the end baffle covers the end of the arc extinguishing chamber and the side baffle covers the side of the arc extinguishing chamber, wherein a long groove is opened on the side baffle for the movement of the external moving contact.

[0013] As a further improvement of the utility model, a plug-in plate extending along the length direction of the side baffle is fixed on the side surface of the side baffle, and the plug-in plate is inserted into the groove of the arc extinguishing chamber grid.

[0014] As a further improvement of the utility model, a clamping plate is fixed to one side of the end baffle plate facing away from the side baffle plate, and a clamping groove is provided on the side of the clamping plate so that when the dust cover is installed on the arc extinguishing chamber, the middle protrusion of the grid of the arc extinguishing chamber is embedded in the clamping groove, and a buckle is fixed to the outer side of the clamping plate, and a clamping hole is provided on the side wall of the arc extinguishing chamber, and the buckle is embedded in the clamping hole to connect the clamping plate with the arc extinguishing chamber.

[0015] The beneficial effect of the utility model is that by installing a static cover on the static contact, the static contact can be effectively protected from arc burns, and the problem of arc reignition in the breaking test can be effectively solved, the arc burning time can be shortened, and the consistency of the breaking test can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the arc extinguishing system of the circuit breaker of the utility model applied to the circuit breaker;

[0017] Figure 2 The overall structure diagram of the arc extinguishing system of the circuit breaker of the utility model;

[0018] Figure 3 for Figure 1 The overall structural diagram of the static cover;

[0019] Figure 4 for Figure 1 The overall structure diagram of the middle dust cover. DETAILED DESCRIPTION

[0020] The present invention will be further described below with reference to the embodiments shown in the accompanying drawings.

[0021] Reference Figures 1 to 4As shown in the figure, an arc extinguishing system of a circuit breaker according to this embodiment includes a static contact 1 and an arc extinguishing chamber 2. The static contact 1 is placed inside the arc extinguishing chamber 2. It is characterized in that: it further includes a static cover 3, and the static cover 3 is assembled on the static contact 1 to isolate the static contact 1 from the grid plates of the arc extinguishing chamber 2. Through the setting of the static cover 3, it can cover the static contact 1 and play a good role in protecting the static contact 1 during the arc extinguishing process, protecting the static contact from being burned by the arc. At the same time, it can effectively solve the problem of arc restriking in the breaking test, shorten the arcing time, improve the consistency of the breaking test, and the static contact 1 in this embodiment adopts a "day" character structure, effectively saving materials and being able to provide a certain repulsive force during breaking.

[0022] As a specific improvement embodiment, the static cover 3 includes a bottom plate 31 and side plates 32. An installation groove for the static contact 1 is opened on the bottom plate 31, and the side plates 32 are fixedly installed on the bottom plate 31 to isolate the installation groove from the grid plates of the arc extinguishing chamber 2. Through the setting of the bottom plate 31 and the side plates 32, a structure for protecting the static contact 1 can be effectively realized, and the overall structure is simple and easy to manufacture.

[0023] As a specific improvement embodiment, there are two side plates 32, which are respectively fixedly installed on the left and right sides of the bottom plate 31 relative to the installation groove to form a gas-gathering structure with the bottom plate 31. By setting the static cover 3 into a gas-gathering structure, the breaking capacity can be effectively improved.

[0024] As a specific improvement embodiment, a hook structure 33 is provided on the static cover 3. When the static cover is installed on the static contact 1, the hook structure 33 can hook the side of the static contact 1 to fix the static cover on the static contact 1. Through the setting of the hook structure 33, the assembly efficiency can be effectively improved and the installation of the static cover 3 is convenient.

[0025] As a specific improvement embodiment, a fixed protective baffle 34 is provided at a position of the static cover 3 close to the hook structure 33. The protective baffle 34 is on the side of the hook structure 33 facing away from the hook part, and the protective baffle 34 is spaced from the hook structure 33. Through the setting of the protective baffle 34, it can prevent the hook structure 33 from being overly bent and easily broken by the way of the protective baffle 34 abutting against the hook structure 33. By adopting the spaced setting method, a certain bending ability of the hook structure 33 can be ensured, and the assembly efficiency is guaranteed.

[0026] As a specific implementation of the improvement, a groove for installing external magnetic blowing parts is opened at the bottom of the base plate 31, and an arc-shaped side plate 35 is fixed on the side of the base plate 31 away from the hook structure 33. The setting of the groove can provide space for adding magnetic blowing parts in the later stage, and further improve the breaking capacity of the produced product. In addition, the setting of the arc-shaped side plate 35 can further protect the static contact and prevent the static contact from being burned by the arc during the breaking test.

[0027] As a specific implementation of the improvement, a removable dust cover 4 is provided on the top of the arc extinguishing chamber 2. The dust cover 4 can effectively prevent arc particles from entering the mechanism, and can prevent metal particles from entering the product operating mechanism during the breaking test, thereby ensuring that the operating performance of the product after the breaking test is reliable and avoiding problems such as jamming and failure to close the circuit breaker.

[0028] As an improved specific implementation method, the dust cover 4 includes an end baffle 41 and a side baffle 42, and one side of the end baffle 41 is fixed to one side of the side baffle 42, so that when the dust cover 4 is installed on the arc extinguishing chamber 2, the end baffle 41 covers the end of the arc extinguishing chamber 2, and the side baffle 42 covers the side of the arc extinguishing chamber 2, wherein a long groove is opened on the side baffle 42 for the movement of the external moving contact. Through the arrangement of the end baffle 41 and the side baffle 42, the end face and side face of the arc extinguishing chamber 2 can be effectively covered, which can better prevent metal particles from entering the product operating mechanism.

[0029] As a specific implementation of the improvement, a plug plate 43 extending along the length direction of the side baffle plate 42 is fixed on the side surface of the side baffle plate 42, and the plug plate 43 is inserted into the groove of the grid of the arc extinguishing chamber 2. Through the setting of the plug plate 43, the connection between the side baffle plate 42 and the arc extinguishing chamber can be effectively achieved by inserting the plug plate 43 into the groove of the grid of the arc extinguishing chamber 2, and at the same time, the dust prevention effect can be better achieved.

[0030] As an improved specific implementation, a clamping plate 44 is fixed to one side of the end baffle 41 facing away from the side baffle 42, and a clamping groove is provided on the side of the clamping plate 44, so that when the dust cover 4 is installed on the arc extinguishing chamber 2, the middle protrusion of the grid sheet of the arc extinguishing chamber 2 is embedded in the clamping groove, and a buckle is fixed on the outer side of the clamping plate 44, and a clamping hole is provided on the side wall of the arc extinguishing chamber 2, and the buckle is embedded in the clamping hole to connect the clamping plate 44 with the arc extinguishing chamber 2. Through the setting of the clamping plate 44, the connection between the end baffle 41 and the arc extinguishing chamber 2 can be effectively achieved by using the middle protrusion of the grid sheet of the arc extinguishing chamber 2 to be embedded in the clamping groove, and at the same time, through the setting of the buckle on the outer side of the clamping plate 44, the grid sheet of the arc extinguishing chamber 2 of this embodiment is installed obliquely, so the end baffle 41 is arranged obliquely as a whole, and then the middle part is arched to form a space for the moving contact to move, further increasing the reliability of the cooperation between the end baffle 41 and the arc extinguishing chamber 2.

[0031] To sum up, the arc extinguishing system of the circuit breaker of this embodiment adopts the setting of the static cover 3, which can effectively realize the protection effect for the static contact 1, can effectively increase the current limiting capability, and reduce arc particles. In the unique design of the static cover, gas is gathered and pressure is reduced, which effectively improves the high breaking capacity.

[0032] The above is only a preferred embodiment of the present invention. The protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. An arc extinguishing system for a circuit breaker, comprising a stationary contact (1) and an arc extinguishing chamber (2), wherein the stationary contact (1) is placed in the arc extinguishing chamber (2), and characterized in that: It also comprises a static cover (3), wherein the static cover (3) is mounted on the static contact (1) to isolate the static contact (1) from the grid of the arc extinguishing chamber (2).

2. The arc extinguishing system of the circuit breaker according to claim 1, characterized in that: The static cover (3) comprises a bottom plate (31) and a side plate (32); a mounting groove for the static contact (1) is provided on the bottom plate (31); and the side plate (32) is fixedly mounted on the bottom plate (31) to isolate the mounting groove from the grid of the arc extinguishing chamber (2).

3. The arc extinguishing system of the circuit breaker according to claim 2, characterized in that: Two side plates (32) are provided, which are respectively fixedly mounted on the left and right sides of the bottom plate (31) relative to the mounting groove, so as to form a gas gathering structure with the bottom plate (31).

4. The arc extinguishing system of the circuit breaker according to claim 1, 2 or 3, characterized in that: The static cover (3) is provided with a hook structure (33), and when the static cover is mounted on the static contact (1), the hook structure (33) can hook the side of the static contact (1) to fix the static cover on the static contact (1).

5. The arc extinguishing system of the circuit breaker according to claim 4, characterized in that: A fixed protective baffle (34) is provided on the static cover (3) at a position close to the hook structure (33); the protective baffle (34) is located on a side of the hook structure (33) facing away from the hook portion, and the protective baffle (34) is spaced apart from the hook structure (33).

6. The arc extinguishing system of the circuit breaker according to claim 2 or 3, characterized in that: A groove for installing external magnetic blowing parts is provided at the bottom of the bottom plate (31), and an arc-shaped side plate (35) is fixed to a side of the bottom plate (31) away from the hook structure (33).

7. The arc extinguishing system of a circuit breaker according to claim 1, 2 or 3, characterized in that: A detachable dust cover (4) is provided on the top of the arc extinguishing chamber (2).

8. The arc extinguishing system of the circuit breaker according to claim 7, characterized in that: The dust cover (4) comprises an end baffle (41) and a side baffle (42), one side of the end baffle (41) being fixed to one side of the side baffle (42) so that when the dust cover (4) is mounted on the arc extinguishing chamber (2), the end baffle (41) covers the end of the arc extinguishing chamber (2) and the side baffle (42) covers the side of the arc extinguishing chamber (2), wherein a long groove for movement of an external moving contact is provided on the side baffle (42).

9. The arc extinguishing system of the circuit breaker according to claim 8, characterized in that: An insert plate (43) extending along the length direction of the side baffle plate (42) is fixed on the side surface of the side baffle plate (42), and the insert plate (43) is inserted into the groove of the grid plate of the arc extinguishing chamber (2).

10. The arc extinguishing system of the circuit breaker according to claim 9, characterized in that: A clamping plate (44) is fixed to one side of the end baffle (41) facing away from the side baffle (42); a clamping groove is provided on the side of the clamping plate (44), so that when the dust cover (4) is mounted on the arc extinguishing chamber (2), a central protrusion of the grid of the arc extinguishing chamber (2) is embedded in the clamping groove; a buckle is fixed to the outside of the clamping plate (44); a clamping hole is provided on the side wall of the arc extinguishing chamber (2), and the buckle is embedded in the clamping hole, so as to connect the clamping plate (44) to the arc extinguishing chamber (2).

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