Low-cost miniature circuit breaker

Abstract

The utility model relates to a low-cost miniature circuit breaker, which comprises a shell, an operating mechanism arranged in the shell, a moving contact in linkage fit with the operating mechanism, a static contact and an electromagnetic tripping mechanism, and a plurality of gas production raised lines distributed at intervals are arranged on one side, corresponding to the moving contact, in the shell. A pressure relief cavity is formed in the position, corresponding to one side of the multiple gas production protruding strips, in the shell, arc extinguishing grid pieces separated between the pressure relief cavity and the multiple gas production protruding strips are arranged in the shell, exhaust holes communicated with the pressure relief cavity are formed in the shell, and multiple pressure relief channels are formed among the multiple gas production protruding strips. The plurality of pressure relief channels are communicated between the moving contact and the arc extinguishing grid sheet, and the arc extinguishing grid sheet is provided with a plurality of arc extinguishing holes communicated between the pressure relief channels and the pressure relief cavity. The arc extinguishing device has the advantages of simple structure, stable and reliable performance, good arc extinguishing effect and low cost.

Description

Technical Field

[0001] The utility model relates to the technical field of circuit breakers, in particular to a low-cost miniature circuit breaker. Background Art

[0002] Miniature circuit breakers, also known as miniature circuit breakers, are suitable for overload and short-circuit protection of AC 50 / 60Hz rated voltage 230 / 400V and rated current not exceeding 125A lines. They can also be used for infrequent line operation conversion under normal circumstances. Miniature circuit breakers are mainly used in various places such as industry, commerce, high-rise buildings and residential buildings. Miniature circuit breakers include a housing, an operating mechanism, a moving contact, a static contact, and an arc extinguishing chamber. Existing miniature circuit breakers all use an arc extinguishing chamber structure to extinguish the arc. Although they can extinguish the arc, the production cost is high. In addition, the miniature circuit breaker has the defects of complex structure and unreliable performance. Summary of the invention

[0003] The utility model aims to overcome the defects of the prior art and provide a low-cost miniature circuit breaker with simple structure, stable and reliable performance and good arc extinguishing effect.

[0004] To achieve the above-mentioned purpose, the utility model adopts a low-cost small circuit breaker, including a shell, an operating mechanism arranged in the shell, a moving contact, a static contact and an electromagnetic tripping mechanism that cooperate with the operating mechanism, a plurality of gas-producing convex strips arranged and distributed at intervals on one side of the shell corresponding to the moving contact, a pressure relief chamber is arranged on one side of the shell corresponding to the plurality of gas-producing convex strips, an arc-extinguishing grid separated between the pressure relief chamber and the plurality of gas-producing convex strips is arranged in the shell, an exhaust hole connected to the pressure relief chamber is arranged in the shell, a plurality of pressure relief channels are formed between the plurality of gas-producing convex strips, the plurality of pressure relief channels are connected between the moving contact and the arc-extinguishing grid, and a plurality of arc-extinguishing holes connected between the pressure relief channel and the pressure relief chamber are arranged on the arc-extinguishing grid.

[0005] The beneficial effects of the above structure are: the shell adopts a narrow slit pressure relief structure design, and does not need to extinguish the arc through the arc extinguishing chamber, which has lower cost. When working, the arc enters the pressure relief channel, the gas-generating convex strips can lengthen and cool the arc, and the arc extinguishing grid can quickly extinguish the arc, and the arc extinguishing performance is better. Therefore, the small circuit breaker has the advantages of simple structure, stable and reliable performance, low cost, and good arc extinguishing performance.

[0006] In particular, the tail of the moving contact has an arc striking angle, and the tail of the arc striking angle is bent and extended toward the pressure relief channel. The arc striking angle can quickly introduce the arc at the moving contact into the pressure relief channel, which is conducive to the rapid extinguishing of the arc.

[0007] In particular, the static contact is provided with an arc-starting plate, one end of which extends below the plurality of gas-generating convex strips. The arc-starting plate can quickly introduce the arc at the static contact into the pressure relief channel, thereby facilitating the arc extinguishing effect of the miniature circuit breaker.

[0008] In particular, a group of arc-isolating plate assemblies are respectively arranged at both sides of the corresponding moving contact and the static contact in the housing, and the arc-isolating plate assemblies include arc-isolating plates arranged on the inner wall of the housing, and magnetic conductive sheets arranged between the arc-isolating plates and the housing. An arc-extinguishing channel is formed between the two groups of arc-isolating plate assemblies, and the arc-extinguishing channel is connected between the moving contact and the pressure relief channel. The magnetic conductive sheets can play a role of magnetic blowing, and the arc-extinguishing channel between the two groups of arc-isolating plate assemblies can quickly introduce the arc into the pressure relief channel, thereby facilitating the arc-extinguishing effect of the small circuit breaker.

[0009] In particular, a clamping sleeve matched with the arc isolation plate is provided in the shell, a clamping hole matched with the clamping sleeve is provided on the arc isolation plate, the clamping sleeve is inserted into the clamping hole, and constitutes a clamping fit between the arc isolation plate and the shell. The arc isolation plate and the shell are connected by a clamping fit, so that the assembly of the arc isolation plate and the shell is convenient and the assembly is more convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a three-dimensional diagram of the internal structure of an embodiment of the utility model.

[0011] Figure 2 It is the front view of the internal structure of the embodiment of the utility model.

[0012] Figure 3 This is a cross-sectional view of an embodiment of the utility model. DETAILED DESCRIPTION

[0013] like Figures 1 to 3As shown, an embodiment of the utility model is a low-cost small circuit breaker, including a shell 10, an operating mechanism 11 arranged in the shell 10, a moving contact 12 linked with the operating mechanism 11, a static contact 13, and an electromagnetic tripping mechanism 14. The shell 10 has a plurality of gas-producing convex strips 101 arranged and distributed at intervals on one side corresponding to the moving contact 12, and a pressure relief chamber 102 is arranged on one side corresponding to the plurality of gas-producing convex strips 101 in the shell 10. The shell 10 is provided with an arc-extinguishing grid 15 separated between the pressure relief chamber 102 and the plurality of gas-producing convex strips 101. The shell 10 is provided with an exhaust hole 103 connected to the pressure relief chamber 102. A plurality of pressure relief channels 100 are formed between the plurality of gas-producing convex strips 101. The plurality of pressure relief channels 100 are connected between the moving contact 12 and the arc-extinguishing grid 15. The arc-extinguishing grid 15 is provided with a plurality of arc-extinguishing holes 151 connected between the pressure relief channel 100 and the pressure relief chamber 102. The tail of the moving contact 12 has an arc-striking angle 121, and the tail of the arc-striking angle 121 is bent and extended in the direction of the pressure relief channel 100. The arc-striking angle can quickly introduce the arc at the moving contact into the pressure relief channel, which is conducive to the rapid extinguishing of the arc. The static contact 13 is provided with an arc-striking plate 16, and one end of the arc-striking plate 16 extends below the multiple gas-generating convex strips 101. The arc-striking plate can quickly introduce the arc at the static contact into the pressure relief channel, which is conducive to improving the arc extinguishing effect of the small circuit breaker.

[0014] like Figure 1 and 2 As shown, a group of arc-isolating plate assemblies 20 are respectively arranged at both sides of the moving contact 12 and the static contact 13 in the housing 10. The arc-isolating plate assemblies 20 include arc-isolating plates 21 arranged on the inner wall of the housing 10, and magnetic conductive sheets 22 arranged between the arc-isolating plates 21 and the housing 10. An arc-extinguishing channel 200 is formed between the two groups of arc-isolating plate assemblies 20, and the arc-extinguishing channel 200 is connected between the moving contact 12 and the pressure relief channel 100. The magnetic conductive sheets can play a role of magnetic blowing, and the arc-extinguishing channel between the two groups of arc-isolating plate assemblies can quickly introduce the arc into the pressure relief channel, thereby facilitating the arc-extinguishing effect of the small circuit breaker. A clamping sleeve 104 matching with the arc-isolating plate 21 is arranged in the housing 10, and a clamping hole 211 matching with the clamping sleeve 104 is arranged on the arc-isolating plate 21. The clamping sleeve 104 is inserted into the clamping hole 211 and constitutes a clamping fit between the arc-isolating plate 21 and the housing 10. The arc isolation plate and the shell are connected by a snap-fitting manner, so that the arc isolation plate and the shell are easily assembled and the assembly is more convenient.

[0015] The shell adopts a narrow slit pressure relief structure design, which does not require arc extinguishing through the arc extinguishing chamber, and has lower cost. When working, the arc enters the pressure relief channel, the gas-generating convex strips can lengthen and cool the arc, and the arc extinguishing grid can quickly extinguish the arc, and the arc extinguishing performance is better. Therefore, the small circuit breaker has the advantages of simple structure, stable and reliable performance, low cost, and good arc extinguishing performance.

Claims

1. A low-cost miniature circuit breaker, comprising a housing, an operating mechanism arranged in the housing, a moving contact, a stationary contact and an electromagnetic tripping mechanism that cooperate with the operating mechanism, characterized in that: A plurality of gas-producing convex strips are arranged at intervals on one side of the shell corresponding to the moving contact, a pressure relief chamber is arranged on one side of the shell corresponding to the multiple gas-producing convex strips, an arc-extinguishing grid separating the pressure relief chamber and the multiple gas-producing convex strips is arranged in the shell, an exhaust hole connected to the pressure relief chamber is arranged in the shell, a plurality of pressure relief channels are formed between the multiple gas-producing convex strips, the multiple pressure relief channels are connected between the moving contact and the arc-extinguishing grid, and a plurality of arc-extinguishing holes connected between the pressure relief channel and the pressure relief chamber are arranged on the arc-extinguishing grid.

2. The low-cost miniature circuit breaker according to claim 1, characterized in that: The tail of the moving contact has an arc striking angle, and the tail of the arc striking angle is bent and extended toward the direction of the pressure relief channel.

3. The low-cost miniature circuit breaker according to claim 1 or 2, characterized in that: The static contact is provided with an arc-starting plate, one end of which extends below a plurality of gas-generating convex strips.

4. The low-cost miniature circuit breaker according to claim 1 or 2, characterized in that: A group of arc isolation plate assemblies are respectively arranged at both sides of the corresponding moving contact and the static contact in the shell. The arc isolation plate assembly includes an arc isolation plate arranged on the inner wall of the shell and a magnetic conductive sheet arranged between the arc isolation plate and the shell. An arc extinguishing channel is formed between the two groups of arc isolation plate assemblies, and the arc extinguishing channel is connected between the moving contact and the pressure relief channel.

5. The low-cost miniature circuit breaker according to claim 4, characterized in that: A clamping sleeve matched with the arc isolation plate is arranged in the shell, a clamping hole matched with the clamping sleeve is arranged on the arc isolation plate, the clamping sleeve is inserted in the clamping hole, and constitutes the clamping match between the arc isolation plate and the shell.

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