Static contact structure and circuit breaker

Abstract

The static contact structure comprises a busbar, an arc contact seat, a static arc contact, a static main contact, a supporting plate, an insulating cover and an arc striking plate, the circuit breaker further comprises a bottom plate, the arc contact seat and the supporting plate are installed on the rear side of the busbar and fixed to the bottom plate, the busbar penetrates through the bottom plate, the insulating cover is fixed to the arc contact seat, and the arc striking plate is fixed to the insulating cover. The static main contact is fixed on the rear end face of the busbar, and the static arc contact is fixed on the upper side of the rear surface of the arc contact seat and on the lower side of the rear surface of the air switch, so that the problem that the static main contact of a static contact in the prior art is easy to ablate is solved, and the technical effects of improving the safety of the static contact and replacing the ablated part conveniently are achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of low-voltage electrical appliances, in particular to a frame-type circuit breaker static contact structure and a circuit breaker. Background Art

[0002] In low-voltage universal circuit breakers, the static contact is one of the main parts of the switch that carries and breaks the current, and its role is very important. After the circuit breaker is closed, the static main contact is a carrier that is powered for a long time. When the switch encounters a fault current and breaks, the arc will burn the static main contact. The burning of the static main contact will bring huge safety hazards to the switch. For example, the sharp increase in contact resistance after burning will bring about a sharp increase in the temperature rise of the switch, and even cause product burnout. Utility Model Content

[0003] In view of the deficiencies of the prior art, the utility model provides a static contact structure and a circuit breaker to solve the problem that the static main contact of the static contact in the prior art is easily ablated.

[0004] In order to achieve the above objectives, the present invention is implemented through the following technical solutions:

[0005] A static contact structure includes a busbar, and also includes an arc contact seat, a static arc contact, a static main contact, a support plate, an insulating cover and an arc-striking plate, wherein the support plate is L-shaped, and is installed below the rear of the busbar through a side wall, and the other side wall is perpendicular to the transverse direction of the busbar, the arc contact seat is installed on the rear of the busbar, and the cross-section of the arc contact seat is a "convex" shape, the static arc contact is fixed on the upper side of the rear surface of the arc contact seat and the lower side of the rear surface is open, the static main contact is fixed on the rear end surface of the busbar, the insulating cover is mounted on the arc contact seat from the rear side, and the insulating cover is an open structure with a shape corresponding to the surface shape of the arc contact seat, the arc-striking plate is a bent strip and uses a conductive substrate and includes an upper longitudinal mounting portion and a lower longitudinal mounting portion, and the arc-striking plate is mounted on the front side of the top of the arc contact seat through the lower longitudinal mounting portion.

[0006] Preferably, the static arc contact is fixed to the upper side of the rear surface of the arc contact holder by welding.

[0007] Preferably, the static main contact is fixed to the rear end surface of the busbar by welding.

[0008] Preferably, the insulating cover is made of BMC or a mixture of nylon and glass fiber.

[0009] Preferably, the arc contact seat is made of a copper substrate.

[0010] Preferably, the conductive substrate used for the arc starting plate includes but is not limited to iron or copper or copper tungsten.

[0011] Preferably, the static main contact and the static arc contact are made of copper tungsten.

[0012] Preferably, recessed platforms for mounting arc contact seats and support plates are provided on the upper and lower surfaces of the rear portion of the busbar.

[0013] Preferably, mounting screw holes are provided at the mounting positions of the rear portion of the busbar and the arc contact seat and the support plate, mounting screw holes are also provided at corresponding positions on the sides of the arc contact seat and the insulating cover, and mounting screw holes are also provided at corresponding positions on the front surface of the arc contact seat and the longitudinal mounting portion on the lower side of the arc striking plate.

[0014] Based on the same inventive concept, the present application also discloses a circuit breaker, comprising a base plate, a moving contact structure, an arc extinguishing chamber, and the aforementioned static contact structure, wherein the static contact structure is fixedly mounted on the base plate through a support plate and an arc striking plate, and a busbar hole is opened on the base plate, and the busbar of the static contact structure passes through the busbar hole on the base plate, and the moving contact structure comprises a moving contact sheet, and a moving arc contact and a moving main contact are welded on the moving contact sheet at positions corresponding to the static arc contact and the static main contact facing the arc contact seat, and the moving contact structure rotates around a moving contact shaft mounted on the contact side plate, and the moving arc contact and the moving main contact respectively contact with the static arc contact and the moving arc contact during the rotation of the moving contact structure, and the arc extinguishing chamber is installed above the static arc contact and the moving arc contact.

[0015] The static contact structure and circuit breaker proposed in the present application are provided with a static main contact and a static arc contact, and there is insulation protection between the static arc contact and the static main contact. The static main contact has almost no risk of ablation caused by arcing during the use of the switch; the static arc contact is used as a carrier for the switch to break large currents, and the arc generated will ablate on the static arc contact until the arc is transferred, and the static arc contact is also very convenient to replace. This solution increases the safety of the static contact and the convenience of replacing the ablated part. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1a An exploded schematic diagram of an embodiment of a stationary contact structure from a first perspective;

[0017] Figure 1b It is an exploded schematic diagram of another perspective of an embodiment of a static contact structure;

[0018] Figure 2a It is a three-dimensional schematic diagram of a static contact structure embodiment after assembly from one viewing angle;

[0019] Figure 2b It is a three-dimensional schematic diagram of another perspective of the assembled embodiment of the static contact structure;

[0020] Figure 3a It is an exploded schematic diagram of a bottom plate assembly embodiment from a first perspective;

[0021] Figure 3b It is an exploded schematic diagram of another perspective of an embodiment of a base plate assembly;

[0022] Figure 4a A three-dimensional schematic diagram of a bottom plate assembly embodiment after assembly from one viewing angle;

[0023] Figure 4b It is a front view of the bottom plate assembly embodiment after assembly;

[0024] Figure 5 It is a cross-sectional view of an embodiment of a circuit breaker along the transverse direction of the busbar;

[0025] Among them, 1-static contact structure, 11-busbar, 12-arc contact seat, 13-static arc contact, 14-static main contact, 15-support plate, 16-insulating cover, 17-arc starting plate, 2-bottom plate, 31-first position screw, 32-second position screw, 33-third position screw, 34-fourth position screw, 35-fifth position screw, 36-sixth position screw, 4-moving contact structure, 41-moving contact piece, 42-moving arc contact, 43-moving main contact, 5-arc extinguishing chamber, 61-mechanism main shaft, 62-mechanism main shaft cantilever, 63-moving contact support, 64-moving contact center shaft, 7-arc. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0027] The present embodiment provides a technical solution: the static contact structure 1 of the utility model includes a busbar 11, an arc contact seat 12, a static arc contact 13, a static main contact 14, a support plate 15, an insulating cover 16 and an arc-starting plate 17, wherein the support plate 15 is L-shaped, and the support plate 15 is installed below the rear of the busbar 11 through a side wall, and the other side wall is perpendicular to the horizontal direction of the busbar 11, and the arc contact seat 12 is installed on the rear of the busbar 11. The rear of the busbar 11 and the mounting position of the arc contact seat 12 and the support plate 15 are provided with mounting screw holes, and the third position screw 33 passes through the support plate 15, the busbar 11, and the arc contact seat 12 to firmly fix the three.

[0028] The cross-section of the arc contact seat 12 is a "convex" shape, the static arc contact 13 is welded and fixed to the upper side of the rear surface of the arc contact seat 12 and the lower side of the rear surface is left open, the static main contact 14 is welded and fixed to the rear end surface of the busbar 11, and the insulating cover 16 is mounted on the arc contact seat 12 from the rear side. The insulating cover 16 is an open structure whose shape corresponds to the surface shape of the arc contact seat 12. Mounting screw holes are also opened at corresponding positions on the sides of the arc contact seat 12 and the insulating cover 16. The insulating cover 16 is fixed to the arc contact seat 12 by an unlimited number of first position screws 31.

[0029] The arc-striking plate 17 is a bent strip and uses a conductive substrate and includes an upper longitudinal mounting portion and a lower longitudinal mounting portion. The arc-striking plate 17 is installed on the top front side of the arc contact seat 12 through the lower longitudinal mounting portion. Mounting screw holes are also provided at corresponding positions on the front surface of the arc contact seat 12 and the lower longitudinal mounting portion of the arc-striking plate 17. The arc-striking plate 17 is placed on the arc contact seat 12 and fixed to the arc contact seat 12 through the second position screw 32.

[0030] In this embodiment, the arc contact seat 12 is a copper substrate, the static main contact 14 and the static arc contact 13 are copper tungsten or other burn-resistant, conductive substrates, the insulating cover 16 is made of a flame-retardant substrate with good insulation performance, such as BMC, nylon + glass fiber, etc., and the arc starting plate 17 is not limited to conductive substrates such as iron, copper, copper tungsten, etc.

[0031] Based on the same inventive concept, the present application also provides a circuit breaker, which includes a base plate assembly, a moving contact structure 4, and an arc extinguishing chamber 5. The base plate assembly includes a base plate 2 and a static contact structure 1. The static contact structure 1 is fixedly mounted on the base plate 2 through a support plate 15 and an arc-striking plate 17. A busbar hole is opened on the base plate 2. The busbar 11 of the static contact structure 1 passes through the busbar hole on the base plate 2. In this embodiment, screw holes are opened at corresponding positions of the longitudinal side edge of the support plate 15 and the upper longitudinal mounting portion of the arc-striking plate 17 and the base plate 2. The fourth position screw 34 passes through the arc-striking plate 17 and is fixed to the base plate 2. The fifth position screw 35 passes through the support plate 15 and is fixed to the base plate 2. The arc contact seat Screw holes are also opened at corresponding positions of the front surface of 12 and the base plate 2, and the sixth position screw 36 on the reverse side passes through the base plate 2 and is fixed to the arc contact seat 12 on the static contact structure 1, the moving contact structure 4 includes a moving contact piece 41, the moving arc contact 42 and the moving main contact 43 are both welded on the moving contact piece 41 and are positioned facing the arc contact seat 12 and corresponding to the positions of the static arc contact 13 and the static main contact 14, the moving contact structure 4 rotates around the moving contact shaft installed on the contact side plate, the moving arc contact 42 and the moving main contact 43 are in contact with the static arc contact 13 and the moving arc contact 42 respectively during the rotation of the moving contact structure 4, and the arc extinguishing chamber 5 is installed above the static arc contact 13 and the moving arc contact 42.

[0032] When replacing the static arc contact 13, simply remove the base plate assembly from the front and then replace the arc contact holder 12. Since the arc contact holder 12 is assembled and disassembled by screws in the static contact structure 1, replacement is very convenient, thereby increasing the convenience of replacing the ablated part.

[0033] In the circuit breaker, the mechanism main shaft cantilever 62 rotates around the mechanism main shaft 61, the moving contact support 63 is connected to the distal end of the mechanism main shaft cantilever 62, the moving contact support 63 is connected to the moving contact structure 4, and the moving contact piece 41 rotates around the moving contact central shaft 64.

[0034] During the closing process, the static arc contact 13 and the moving arc contact 42 are in contact first; after the closing is in place, the static main contact 14 and the moving main contact 43 are in full contact. At this time, the static arc contact 13 and the moving arc contact 42 are separated and do not contact each other under the drive of the moving contact support 63 and the moving contact center shaft 64, with a certain gap. During the opening process, the static main contact 13 and the moving main contact 43 are separated first, and the static arc contact 13 and the moving arc contact 42 are separated later. At this time, the current is concentrated on the static arc contact 13 and the moving arc contact 42, so the arc 7 is also generated between the static arc contact 13 and the moving arc contact 42. After a period of time, the arc 7 is completely transferred to the arc extinguishing chamber 5.

[0035] In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0036] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A stationary contact structure, comprising a busbar (11), characterized in that: The utility model also comprises an arc contact seat (12), a static arc contact (13), a static main contact (14), a support plate (15), an insulating cover (16) and an arc starting plate (17); the support plate (15) is L-shaped, the support plate (15) is installed below the rear part of the busbar (11) through one side wall, and the other side wall is perpendicular to the transverse direction of the busbar (11); the arc contact seat (12) is installed above the rear part of the busbar (11); the cross section of the arc contact seat (12) is in the shape of a "convex" character; the static arc contact (13) is fixed on the arc contact seat (11); 2) the upper side of the rear surface and the lower side of the rear surface are open, the static main contact (14) is fixed on the rear end surface of the busbar (11), the insulating cover (16) is mounted on the arc contact seat (12) from the rear side, the insulating cover (16) is an open structure with a shape corresponding to the surface shape of the arc contact seat (12), the arc-starting plate (17) is a bent strip and uses a conductive substrate and includes an upper longitudinal mounting portion and a lower longitudinal mounting portion, and the arc-starting plate (17) is mounted on the top front side of the arc contact seat (12) through the lower longitudinal mounting portion.

2. The stationary contact structure according to claim 1, characterized in that: The static arc contact (13) is fixed on the upper side of the rear surface of the arc contact seat (12) by welding.

3. The stationary contact structure according to claim 1, characterized in that: The static main contact (14) is fixed on the rear end surface of the busbar (11) by welding.

4. The stationary contact structure according to claim 1, characterized in that: The insulating cover (16) is made of BMC or a mixture of nylon and glass fiber.

5. The stationary contact structure according to claim 1, characterized in that: The arc contact seat (12) is made of a copper base material.

6. The stationary contact structure according to claim 1, characterized in that: The conductive base material used for the arc-starting plate (17) includes but is not limited to iron, copper or copper-tungsten.

7. The stationary contact structure according to claim 1, characterized in that: The static main contact (14) and the static arc contact (13) are made of copper tungsten.

8. The stationary contact structure according to claim 1, characterized in that: The upper and lower surfaces of the rear part of the busbar (11) are provided with recessed platforms for mounting an arc contact seat (12) and a support plate (15).

9. The stationary contact structure according to claim 1, characterized in that: The rear of the busbar (11) and the mounting position of the arc contact seat (12) and the support plate (15) are provided with mounting screw holes, the arc contact seat (12) and the insulating cover (16) are provided with mounting screw holes at corresponding positions on the side, and the front surface of the arc contact seat (12) and the lower longitudinal mounting portion of the arc striking plate (17) are provided with mounting screw holes at corresponding positions.

10. A circuit breaker, comprising a base plate (2), a moving contact structure (4), and an arc extinguishing chamber (5), characterized in that: It also includes a stationary contact structure (1) as claimed in any one of claims 1 to 9, wherein the stationary contact structure (1) is fixedly mounted on a base plate (2) through a support plate (15) and an arc-starting plate (17), wherein a busbar hole is provided on the base plate (2), and a busbar (11) of the stationary contact structure (1) passes through the busbar hole on the base plate (2), and the moving contact structure (4) includes a moving contact sheet (41), wherein the moving contact sheet (41) has a static arc contact seat (12) corresponding to the static arc contact seat (12). A moving arc contact (42) and a moving main contact (43) are welded at the positions of the contact (13) and the static main contact (14); the moving contact structure (4) rotates around a moving contact shaft installed on a contact side plate; the moving arc contact (42) and the moving main contact (43) respectively contact the static arc contact (13) and the moving arc contact (42) during the rotation of the moving contact structure (4); and the arc extinguishing chamber (5) is installed above the static arc contact (13) and the moving arc contact (42).

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