Arc striking plate installation limiting structure of circuit breaker

Abstract

A run-on plate mounting and limiting structure of a circuit breaker belongs to the technical field of low-voltage electric appliances. Comprising a shell, and a moving contact system, a middle housing, a static contact, a run-on plate and an arc extinguishing system which are arranged in the shell, the shell comprises an upper base and a pedestal, the moving contact system comprises a moving contact and a rotating shaft, the upper end of the moving contact is pivoted on the rotating shaft, the rotating shaft is connected with an operating mechanism, the middle housing is arranged between the moving contact system and the arc extinguishing system, and the static contact is arranged in the middle housing. The moving contact system is arranged on the middle cover shell, the lower end of the moving contact penetrates through the middle cover shell to be in contact with or separated from the static contact, and the run-on plate is arranged on one side of the moving contact. The end tab installation limiting structure of the circuit breaker is characterized in that the end tab installation limiting structure of the circuit breaker comprises a guide part arranged on the end tab and a limiting part which is arranged on the middle housing, corresponds to the guide part in position and is used for enabling the end tab to be at a preset position after the end tab is installed. The device has the advantages that the relatively long run-on plate can be better controlled not to deflect after being assembled, the assembling reliability of the circuit breaker is ensured, and the assembling efficiency is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of low-voltage electrical appliances, and in particular relates to an arc-starting plate installation limiting structure of a circuit breaker. Background Art

[0002] In high-voltage and high-current disconnection, the arc seriously burns the end of the moving guide rod, causing the distance between the end of the moving guide rod and the grid group to become farther, which makes it more difficult for the arc to enter the grid when disconnecting again, and the arc extinguishing time is therefore prolonged, thereby further aggravating the burning of the moving guide rod. This vicious cycle brings the risk of arc extinguishing failure during multiple disconnections. In order to improve this problem, an arc-starting plate with the same potential as the moving guide rod is added in the prior art. When the arc is generated and quickly transferred from the moving guide rod to the arc-starting plate, the arc will no longer burn the moving guide rod. However, at the same time, the disadvantage is that the arc-starting plate is often long, which causes the arc-starting angle position on the arc-starting plate to shift after assembly, making the arc extinguishing system difficult to assemble.

[0003] In view of the above-mentioned prior art, it is necessary to reasonably improve the arc-starting plate structure and its fixing structure of the existing circuit breaker. To this end, the applicant has made a useful design, and the technical solution to be introduced below is produced under this background. Utility Model Content

[0004] The task of the utility model is to provide an arc-striking plate installation limiting structure for a circuit breaker, which can better control a relatively long arc-striking plate from deflecting after being assembled.

[0005] The task of the utility model is accomplished in this way. The circuit breaker includes a shell and a moving contact system, an intermediate cover shell, a static contact, an arc-striking plate and an arc-extinguishing system arranged inside the shell. The shell includes an upper base and a base connected to the upper and lower parts thereof. The moving contact system includes a moving contact and a rotating shaft. The upper end of the moving contact is pivoted on the rotating shaft, and the rotating shaft is connected to an operating mechanism arranged outside the upper base. The intermediate cover shell is arranged between the moving contact system and the arc-extinguishing system to separate the rotating shaft from the arc-extinguishing system. The moving contact system is rotatably arranged on the intermediate cover shell and rotates with the operating mechanism. The lower end of the moving contact passes through the intermediate cover shell to contact or separate from the static contact. The arc-striking plate is arranged on one side of the moving contact and is used to connect the arc generated when the moving contact is disconnected. The characteristic is that the arc-striking plate installation limit structure of the circuit breaker includes a guide portion arranged on the arc-striking plate and a limit portion arranged on the intermediate cover shell and corresponding to the guide portion, which is used to make the arc-striking plate be in a predetermined position after installation.

[0006] In a specific embodiment of the utility model, a flat-plate-shaped isolating portion for isolating the rotating shaft from the arc extinguishing system of the circuit breaker is provided on the intermediate cover, and a cavity for the moving contact to pass through is opened on the isolating portion. After passing through the cavity, the moving contact contacts and separates with the static contact through rotation.

[0007] In another specific embodiment of the utility model, a boss extending toward the arc extinguishing system is provided on one side of the cavity close to the arc striking plate, and a pair of spaced protrusions are extended from the side of the boss toward the arc striking plate, and the space between the pair of protrusions and the boss constitutes a limiting portion.

[0008] In another specific embodiment of the present invention, the guide portion is embedded in the limiting portion.

[0009] In another specific embodiment of the utility model, a connecting portion and an arc striking angle are further provided on the arc striking plate, the connecting portion and the arc striking angle are connected by a plurality of bending sections, and the guide portion is provided on the bending section of the connecting portion close to the limiting portion.

[0010] In another specific embodiment of the utility model, a positioning surface corresponding to the connecting portion on the arc-striking plate is provided on the shell, and when the arc-striking plate is installed, one side surface of the connecting portion fits with the positioning surface to achieve the positioning of the arc-striking plate.

[0011] In yet another specific embodiment of the present invention, the circuit breaker further comprises a connecting plate disposed in the housing and connected to the outside, and after the arc striking plate is installed in place, the connecting portion on the arc striking plate is electrically connected to the connecting plate.

[0012] The utility model adopts the above structure and has the beneficial effect: a limiting portion is provided on the intermediate cover shell inside the shell body for placing the arc-striking plate in a predetermined position after installation; when the arc-striking plate is installed, the limiting portion cooperates with a guide portion close to a connecting portion of the arc-striking plate to prevent the position of the arc-striking angle on the arc-striking plate from shifting, thereby facilitating the assembly of the arc extinguishing system and improving the assembly efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural schematic diagram of the circuit breaker of the utility model;

[0014] Figure 2 This is a schematic diagram of the back structure of the intermediate cover shell of the utility model;

[0015] Figure 3 This is a schematic diagram of the front structure of the arc-starting plate of the utility model;

[0016] Figure 4 It is a schematic diagram of the assembly of the arc-starting plate and the upper base of the utility model.

[0017] In the figure: 1. shell, 11. upper base, 111. positioning surface, 12. base; 2. contact system, 21. moving contact, 22. rotating shaft; 3. intermediate cover, 31. isolating part, 32. cavity, 33. boss, 34. protrusion, 35. limiting part; 4. static contact, 5. arc-striking plate, 51. guiding part, 52. connecting part, 521. front side, 522. upper surface, 53. arc-striking angle; 6. arc-extinguishing system; 7. connecting plate. DETAILED DESCRIPTION

[0018] The specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings, but the description of the embodiments is not a limitation of the technical solution. Any changes in form rather than substance based on the concept of the present invention should be regarded as the protection scope of the present invention.

[0019] In the following description, all concepts related to directionality or orientation such as up, down, left, right, front and back are based on the positions shown in the corresponding drawings being described, and therefore cannot be understood as a special limitation on the technical solution provided by the utility model.

[0020] See also Figures 1 to 3 The utility model relates to an arc-striking plate installation and limiting structure of a circuit breaker, wherein the circuit breaker comprises a housing 1 and a moving contact system 2, an intermediate cover shell 3, a static contact 4, an arc-striking plate 5 and an arc-extinguishing system 6 arranged inside the housing 1, wherein the housing 1 comprises an upper base 11 and a base 12 connected with the upper and lower parts thereof, wherein the moving contact system 2 comprises a moving contact 21 and a rotating shaft 22, wherein the upper end of the moving contact 21 is pivoted on the rotating shaft 22, and the rotating shaft 22 is connected to an operating mechanism (not shown in the figure) arranged outside the upper base 11, wherein the intermediate cover shell 3 is arranged between the moving contact system 2 and the arc-extinguishing system 6 to separate the rotating shaft 22 from the arc-extinguishing system 6, wherein the moving contact system 2 is rotatably arranged on the intermediate cover shell 3 and rotates with the driving of the operating mechanism, wherein the lower end of the moving contact 21 passes through the intermediate cover shell 3 to contact or separate from the static contact 4, and the arc-striking plate 5 is arranged on one side of the moving contact 21 and is used to receive an arc generated when the moving contact 21 is disconnected.

[0021] The arc-striking plate installation limiting structure of the circuit breaker includes a guide portion 51 provided on the arc-striking plate 5 and a limiting portion 35 provided on the intermediate housing 3 and corresponding to the guide portion 51 for making the arc-striking plate 5 be in a predetermined position after installation. When the arc-striking plate 5 is installed, the limiting portion 35 cooperates with the guide portion 51 to prevent the position of the arc-striking angle 53 of the arc-striking plate 5 from being offset, so that the arc-striking angle 53 is always in the middle position of the arc-extinguishing system 6, so that the arc-extinguishing system 6 is not blocked when being installed.

[0022] Furthermore, a flat plate-shaped isolating portion 31 is provided on the intermediate housing 3 for isolating the rotating shaft 22 from the arc extinguishing system 6. The isolating portion 31 can isolate the rotating shaft 22 from the arc extinguishing system 6 to prevent metal particles generated during disconnection from entering the space where the rotating shaft 22 is located, thereby hindering the movement of the rotating shaft 22. A cavity 32 is provided on the isolating portion 31 for the moving contact 21 to pass through. After the moving contact 21 passes through the cavity 32, it rotates to contact and separate with the static contact 4. The number of the cavities 32 is determined by the number of poles of the circuit breaker. The circuit breaker described in this embodiment is a three-pole circuit breaker, so the number of the cavities 32 is 3.

[0023] A boss 33 extending toward the arc extinguishing system 6 is provided on one side of the cavity 32 near the arc striking plate 5, and a pair of spaced protrusions 34 are extended from the side of the boss 33 toward the arc striking plate 5, and a space between the pair of protrusions 34 and the boss 33 constitutes a limiting portion 35. In this embodiment, the guide portion 51 is embedded in the limiting portion 35.

[0024] The arc-striking plate 5 is provided with a connecting portion 52 and an arc-striking angle 53 . The connecting portion 52 and the arc-striking angle 53 are connected via a plurality of bending sections. The guiding portion 51 is provided on the bending section of the connecting portion 52 close to the limiting portion 35 .

[0025] like Figure 4 As shown, the housing 1 is provided with a positioning surface 111 corresponding to the connecting portion 52 on the arc-striking plate 5 . When the arc-striking plate 5 is installed, the connecting portion 52 fits with the positioning surface 111 to achieve the positioning of the arc-striking plate 5 .

[0026] Furthermore, when the arc-striking plate 5 is installed, the guide portion 51 is guided and pushed along the limiting portion 35 until it contacts the connecting plate 7 and is electrically connected. When the arc-striking plate 5 is installed in place, the front side surface 521 of the connecting portion 52 on the arc-striking plate 5 is in contact with the positioning surface 111 of the upper base, limiting the reverse rotation of the arc-striking plate 5. At the same time, the upper surface 522 of the connecting portion 52 is in contact with the connecting plate 7 and is fixed by installing screws to achieve electrical connection with the connecting plate 7. The limiting portion 35 cooperates with the guide portion 51 to prevent the arc-striking plate 5 from deflecting.

Claims

1. An arc-striking plate installation and limiting structure for a circuit breaker, the circuit breaker comprising a housing (1) and a moving contact system (2), an intermediate cover (3), a stationary contact (4), an arc-striking plate (5) and an arc-extinguishing system (6) arranged inside the housing (1) The housing (1) comprises an upper base (11) and a base (12) connected to the upper and lower parts thereof; the moving contact system (2) comprises a moving contact (21) and a rotating shaft (22); the upper end of the moving contact (21) is pivoted on the rotating shaft (22), and the rotating shaft (22) is connected to an operating mechanism arranged outside the upper base (11); the intermediate cover (3) is arranged between the moving contact system (2) and the arc extinguishing system (6) to separate the rotating shaft (22) from the arc extinguishing system (6); the moving contact system (2) is rotatably arranged on the intermediate cover (3) and rotates with the operating mechanism; the lower end of the moving contact (21) passes through the intermediate cover (3) to contact or separate from the static contact (4); the arc striking plate (5) is arranged on one side of the moving contact (21) and is used to receive the arc generated when the moving contact (21) is disconnected; and the invention is characterized in that: The arc striking plate installation limiting structure of the circuit breaker comprises a guide portion (51) arranged on the arc striking plate (5) and a limiting portion (35) arranged on the intermediate cover (3) and corresponding to the guide portion (51) and used to place the arc striking plate (5) in a predetermined position after installation.

2. The arc-starting plate installation limiting structure of a circuit breaker according to claim 1, characterized in that: The intermediate cover (3) is provided with a flat plate-shaped isolating portion (31) for isolating the rotating shaft (22) from the circuit breaker arc extinguishing system (6), and a cavity (32) for the moving contact (21) to pass through is provided on the isolating portion (31). After passing through the cavity (32), the moving contact (21) is rotatably brought into contact with and separated from the stationary contact (4).

3. The arc-starting plate installation limiting structure of a circuit breaker according to claim 2, characterized in that: A boss (33) extending toward the arc extinguishing system (6) is provided on one side of the cavity (32) close to the arc striking plate (5), and a pair of spaced protrusions (34) are extended from the side of the boss (33) facing the arc striking plate (5), and the space between the pair of protrusions (34) and the boss (33) constitutes a limiting portion (35).

4. The arc-starting plate installation limiting structure of a circuit breaker according to claim 3, characterized in that: The guide portion (51) is embedded in the limiting portion (35).

5. The arc-starting plate installation limiting structure of a circuit breaker according to claim 1, characterized in that: The arc-starting plate (5) is also provided with a connecting portion (52) and an arc-starting angle (53); the connecting portion (52) and the arc-starting angle (53) are connected via a plurality of bending sections; and the guiding portion (51) is provided on the bending section of the connecting portion (52) on a side close to the limiting portion (35).

6. The arc-starting plate installation limiting structure of a circuit breaker according to claim 5, characterized in that: The shell (1) is provided with a positioning surface (111) corresponding to the connecting portion (52) on the arc striking plate (5); when the arc striking plate (5) is installed, a side surface of the connecting portion (52) fits with the positioning surface (111), thereby achieving the positioning of the arc striking plate (5).

7. The arc-starting plate installation limiting structure of a circuit breaker according to claim 6, characterized in that: The circuit breaker further comprises a connecting plate (7) arranged in the housing (1) and connected to the outside, and after the arc striking plate (5) is installed in place, the connecting portion (52) on the arc striking plate (5) is electrically connected to the connecting plate (7).

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