A molded case circuit breaker

Abstract

The utility model discloses a kind of molded case circuit breakers, including base and arc extinguishing assembly;The arc extinguishing assembly includes binding post, and binding post is equipped with arc extinguishing chamber, and arc extinguishing chamber is also equipped with gas production cover on it;Gas production cover includes the insertion part inserted into arc extinguishing chamber, and the side of insertion part away from arc extinguishing chamber is also equipped with first cover plate, and the upper end of first cover plate is also equipped with second cover plate;After being through slot first cover plate, second cover plate and insertion part, so that slot guide contact enters into arc extinguishing chamber;The first cover plate is fixed on the outside of louvre support, and the second cover plate is fixed on the inside of the louvre support.Gas production cover cooperates with the blocking portion of arc extinguishing louvre, can prevent sideboard from high temperature deformation and lead to recess shrinkage, ensure that arc extinguishing chamber internal space is constant, long-term maintain arc extinguishing efficiency‌.Especially, insertion part extends to arc extinguishing chamber interior again can lengthen arc and promote it be divided into multiple short arcs by arc extinguishing louvre, accelerate energy dissipation, significantly improve breaking performance.

Description

Technical Field

[0001] This utility model relates to the field of circuit breaker technology, specifically to a molded case circuit breaker. Background Technology

[0002] When the moving and stationary contacts of a molded case circuit breaker break, an electric arc is generated. In order to prevent the electric arc from damaging the internal structure of the molded case circuit breaker, an arc-extinguishing chamber is installed inside the molded case circuit breaker. An arc-extinguishing grid is installed inside the arc-extinguishing chamber. The arc-extinguishing grid divides the electric arc into many short arcs connected in series, thereby achieving the purpose of arc extinguishing.

[0003] Most molded case circuit breakers currently equipped with gas generating hoods in their arc-extinguishing chambers are prone to inward shrinkage, which can seriously affect the movement of the moving contacts. Utility Model Content

[0004] The purpose of this invention is to provide a molded case circuit breaker to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a molded case circuit breaker, comprising a base and an arc-extinguishing assembly installed within the base; the arc-extinguishing assembly includes a terminal block, an arc-extinguishing chamber on the terminal block, and a gas-generating hood on the arc-extinguishing chamber; the gas-generating hood includes a plug portion inserted into the arc-extinguishing chamber, a first cover plate on the side of the plug portion away from the arc-extinguishing chamber, and a second cover plate covering the upper end of the first cover plate; a slot passes through the first cover plate, the second cover plate, and the plug portion to guide a contact into the arc-extinguishing chamber; the first cover plate is fixed to the outside of the grid support, and the second cover plate is fixed to the inside of the grid support.

[0006] As a preferred technical solution of this utility model: the second cover plate is inclinedly disposed on the first cover plate, and the outer side of the second cover plate abuts against the inner wall surface of the grid plate support.

[0007] As a preferred technical solution of this utility model: a buckle plate is provided on the side of the first cover plate away from the second cover plate, and the buckle plate is fastened to the outer wall surface of the grid plate bracket.

[0008] As a preferred technical solution of this utility model, the outer wall surface of the insertion part is provided with reinforcing ribs.

[0009] As a preferred technical solution of this utility model: the terminal block is provided with a first connection hole on the side away from the gas generating hood, and the back of the base is provided with a reserved area, and the first fastener passes through the reserved area and is adapted to connect with the first connection hole.

[0010] As a preferred technical solution of this utility model: the terminal block is further provided with a second connection hole, and is connected to the second connection hole by a second fastener passing through the countersunk hole provided on the base.

[0011] As a preferred technical solution of this utility model, it also includes a back plate, which covers the back of the base to seal the back of the base.

[0012] The beneficial effects of this utility model using the above technical solution are as follows: Since the first cover plate is fixed to the outside of the grid support, and the second cover plate is fixed to the inside of the grid support, i.e., the gas-generating hood cooperates with the blocking part of the arc-extinguishing grid, it can prevent the side plate from deforming due to high temperature, causing the slot to shrink inward, thus ensuring a constant internal space within the arc-extinguishing chamber and maintaining arc-extinguishing efficiency over a long period. In particular, the insertion part extends deep into the arc-extinguishing chamber, and the slot penetrates the insertion part, thereby increasing the gas-generating area and accelerating the speed at which the electric arc enters the arc-extinguishing chamber. The extension of the insertion part into the arc-extinguishing chamber also lengthens the electric arc and causes it to be divided into multiple short arcs by the arc-extinguishing grid, accelerating energy dissipation and significantly improving breaking performance. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the main structure of this utility model; Figure 2 This is an exploded view of the main structure of this utility model; Figure 3 This is an exploded structural diagram of the base of this utility model; Figure 4 for Figure 3 A magnified view of a portion of point A in the middle; Figure 5 This is a schematic diagram of one side of the arc-extinguishing component after disassembly. Figure 6 This is a schematic diagram of the other side of the arc-extinguishing component after disassembly. Figure 7 This is a schematic diagram of the main structure of the terminal block of this utility model.

[0014] In the diagram: 1. Base; 2. Reserved area; 3. Arc extinguishing assembly; 30. Terminal block; 31. Arc extinguishing chamber; 32. Grid plate bracket; 33. Gas generation hood; 34. Buckle plate; 35. Groove; 36. First cover plate; 37. Second cover plate; 38. Plug-in part; 39. Reinforcing rib; 310. First connecting hole; 311. Second connecting hole; 4. First fastener; 5. Second fastener; 6. Back plate; 7. Countersunk hole. Detailed Implementation

[0015] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model. In the description of this utility model, it should be understood that the terms "upper," "lower," "front," "upper surface," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting this utility model.

[0016] Please see Figure 1-7 This utility model provides an embodiment of a molded case circuit breaker, comprising a base 1 and an arc-extinguishing assembly 3 installed within the base 1; the arc-extinguishing assembly 3 includes a terminal block 30, an arc-extinguishing chamber 31 on the terminal block 30, and a gas-generating hood 33 on the arc-extinguishing chamber 31; the gas-generating hood 33 includes a plug portion 38 inserted into the arc-extinguishing chamber 31, and a first cover plate 36 on the side of the plug portion 38 away from the arc-extinguishing chamber 31, and a second cover plate 37 covering the upper end of the first cover plate 36; a slot 35 passes through the first cover plate 36, the second cover plate 37, and the plug portion 38 to guide the contacts into the arc-extinguishing chamber 31; the first cover plate 36 is fixed to the outside of the grid support 32, and the second cover plate 37 is fixed to the inside of the grid support 32.

[0017] In summary, since the first cover plate 36 is fixed to the outside of the grid support 32 and the second cover plate 37 is fixed to the inside of the grid support 32, that is, the gas generating hood 33 cooperates with the blocking part of the arc-extinguishing grid, it can prevent the side plate from shrinking due to high temperature deformation, ensuring that the internal space of the arc-extinguishing chamber 31 is constant and maintaining the arc-extinguishing efficiency in the long term. In particular, the insertion part 38 extends into the interior of the arc-extinguishing chamber 31, and the slot 35 penetrates through the insertion part 38, thus increasing the gas generating area and accelerating the speed at which the electric arc enters the arc-extinguishing chamber 31. The extension of the insertion part 38 into the interior of the arc-extinguishing chamber 31 can also lengthen the electric arc and cause it to be divided into multiple short arcs by the arc-extinguishing grid, accelerating energy dissipation and significantly improving the breaking performance.

[0018] Since the second cover plate 37 is inclinedly disposed on the first cover plate 36, and the outer side of the second cover plate 37 abuts against the inner wall of the grid support 32, the second cover plate 37 can cover the upper part of the arc-extinguishing chamber 31 as much as possible, restricting the upward flow of airflow, so as to avoid the phenomenon of arc reignition or contact erosion caused by disordered gas diffusion, thereby improving the stability of the breaking process.

[0019] To improve the stability of the gas generating hood 33 after installation, a fastening plate 34 is provided on the side of the first cover plate 36 away from the second cover plate 37, and the fastening plate 34 is fastened to the outer wall surface of the grid support 32. Therefore, when the second cover plate 37 abuts against the opposing surfaces of the two grid supports 32, the fastening plate 34 is fastened to the outside of the two grid supports 32, thus enabling the gas generating hood 33 to be stably and reliably located outside the arc extinguishing chamber 31. In addition, the outer wall surface of the insertion part 38 is provided with reinforcing ribs 39, which can be used to improve the structural strength of the insertion parts 38 on both sides of the slot 35, so as to reduce the problem of deformation of the insertion parts 38 on both sides of the slot 35 after heating.

[0020] Based on the above solution, since the terminal block 30 is provided with a first connection hole 310 on the side away from the gas generating hood 33, and the back of the base 1 is provided with a reserved area 2, and the first fastener 4 passes through the reserved area 2 and is adapted to connect with the first connection hole 310, the temperature control chip can be installed in the reserved area 2.

[0021] Furthermore, since the terminal block 30 is also provided with a second connecting hole 311, and a second fastener 5 passes through the countersunk hole 7 provided on the base 1 and connects to the second connecting hole 311, the second fastener 5 can be used to connect to the terminal block 30 so that the entire arc extinguishing assembly 3 can be stably located within the base 1. The first fastener 4 and the second fastener 5 are preferably bolts, and the first connecting hole 310 and the second connecting hole 311 are preferably internally threaded holes.

[0022] In addition, the back plate 6 covers the back of the base 1 to seal the back of the base 1. Therefore, the back plate 6 can be used to protect related equipment installed on the back of the base 1, such as temperature control plates.

[0023] The embodiments of this utility model have been described in detail above with reference to the accompanying drawings, but this utility model is not limited to the described embodiments. For those skilled in the art, various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of this utility model, and these variations still fall within the protection scope of this utility model.

Claims

1. A molded case circuit breaker, characterized in that: Includes a base (1) and an arc-extinguishing assembly (3) installed in the base (1); The arc extinguishing assembly (3) includes a terminal block (30), an arc extinguishing chamber (31) is provided on the terminal block (30), and a gas generating hood (33) is also provided on the arc extinguishing chamber (31). The gas generating hood (33) includes a plug (38) that is inserted into the arc-extinguishing chamber (31). The side of the plug (38) away from the arc-extinguishing chamber (31) is also provided with a first cover plate (36). The upper end of the first cover plate (36) is also provided with a second cover plate (37) covering the upper end of the plug (38). After passing through the first cover plate (36), the second cover plate (37) and the plug-in part (38) through the provided slot (35), the slot (35) guides the contact into the arc-extinguishing chamber (31); The first cover plate (36) is fixed on the outside of the grid support (32), and the second cover plate (37) is fixed on the inside of the grid support (32).

2. A molded case circuit breaker according to claim 1, characterized in that: The second cover plate (37) is inclinedly disposed on the first cover plate (36), and the outer side of the second cover plate (37) abuts against the inner wall surface of the grid support (32).

3. A molded case circuit breaker according to claim 2, characterized in that: The first cover plate (36) is provided with a buckle plate (34) on the side away from the second cover plate (37), and the buckle plate (34) is fastened to the outer wall surface of the grid support (32).

4. A molded case circuit breaker according to claim 3, characterized in that: The outer wall surface of the insertion part (38) is provided with reinforcing ribs (39).

5. A molded case circuit breaker according to any one of claims 1-4, characterized in that: The terminal block (30) is provided with a first connection hole (310) on the side away from the gas generating hood (33). The back of the base (1) is also provided with a reserved area (2), and the first fastener (4) passes through the reserved area (2) and is adapted to the connection hole (310).

6. A molded case circuit breaker according to claim 5, characterized in that: The terminal block (30) is also provided with a second connection hole (311), and is connected to the second connection hole (311) by passing through the countersunk hole (7) provided on the base (1) with a second fastener (5).

7. A molded case circuit breaker according to claim 6, characterized in that: It also includes a back plate (6), which covers the back of the base (1) to seal the back of the base (1).

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