Moving contact assembly and circuit breaker

Abstract

The utility model belongs to the technical field of protection electric appliances, and discloses a moving contact assembly and a circuit breaker. The assembly comprises a moving contact, a support, a rotating shaft, a mounting shaft, a shaft sleeve and an elastic piece. Two opposite first mounting grooves and two opposite first sliding grooves are formed in the rotating shaft, and the first mounting grooves and the first sliding grooves located on the same side communicate with each other; one end of the mounting shaft sequentially penetrates through one end of the support, the moving contact and the other end of the support, two ends of the mounting shaft are respectively sleeved with a shaft sleeve, an elastic piece is arranged between each shaft sleeve and the outer side of the support, the mounting shaft is sleeved with the elastic pieces, and two ends of the mounting shaft are inserted into the corresponding first sliding grooves; the shaft sleeves are arranged in the corresponding first installation grooves through the elastic pieces, and the shaft sleeves and the bottom walls of the first sliding grooves are arranged at intervals. According to the utility model, the assembly efficiency can be improved, the assembly difficulty can be reduced, the repeated assembly and disassembly of components and products are facilitated, the repeated assembly and disassembly can be realized without loss of parts, and the cost waste is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of protective electrical appliances, in particular to a moving contact assembly and a circuit breaker. Background Art

[0002] The conductive system is the main structural component of the molded case circuit breaker, wherein the conductive system includes the moving contact assembly. During the assembly process of the moving contact assembly, the assembly stability between the moving contact and the rotating shaft is very important to the stability of the circuit breaker performance.

[0003] At present, the main assembly method of the moving contact and the rotating shaft is to form a rotating pair by passing the shaft through the moving contact, and the characteristics of the rotating shaft are used to limit the shaft axially, and then the characteristics of the sleeve and the rotating shaft are matched to limit the shaft relative to the rotating shaft to prevent the shaft from falling off the rotating shaft, and finally the sleeve is fixed with a retaining spring.

[0004] In the existing assembly process of the moving contact and the rotating shaft, a retaining spring is used for assembly, which has low assembly efficiency and great assembly difficulty, and is not conducive to repeated disassembly and assembly. In addition, when the retaining spring needs to be disassembled again after the initial assembly, the retaining spring is destructively removed and cannot be used again, which increases the cost. Utility Model Content

[0005] The purpose of the utility model is to provide a moving contact assembly and a circuit breaker, which improves assembly efficiency, reduces assembly difficulty, and facilitates repeated disassembly and assembly of components and products. At the same time, it can realize repeated assembly and disassembly without loss of parts and avoids cost waste.

[0006] To achieve this purpose, the utility model adopts the following technical solutions:

[0007] The moving contact assembly includes a moving contact and further includes:

[0008] Bracket;

[0009] A rotating shaft, wherein two opposite first mounting grooves and two opposite first sliding grooves are provided on the rotating shaft, and the first mounting grooves and the first sliding grooves located on the same side are connected;

[0010] An installation shaft, one end of which passes through one end of the bracket, the moving contact and the other end of the bracket in sequence, both ends of the installation shaft are respectively sleeved with shaft sleeves, an elastic member is provided between each shaft sleeve and the outer side of the bracket, the elastic member is sleeved on the installation shaft, both ends of the installation shaft are inserted into the corresponding first sliding groove, the elastic member places the shaft sleeve in the corresponding first installation groove, and the shaft sleeve is spaced apart from the bottom wall of the first sliding groove.

[0011] As an optional solution of the moving contact assembly, a mounting groove is provided on the rotating shaft, two opposite groove walls of the mounting groove are respectively provided with bosses, and each of the bosses is respectively provided with the first mounting groove and the first sliding groove.

[0012] As an optional solution for the moving contact assembly, the first sliding groove is a strip groove with a side wall penetrating through the surface of the boss.

[0013] As an optional solution of the moving contact assembly, the first mounting groove is a cylindrical groove matching the shape of the shaft sleeve, and the first sliding groove extends into the first mounting groove.

[0014] As an optional solution of the moving contact assembly, an inner wall of one side of the first sliding groove located in the first installation groove is a limiting surface for limiting the installation shaft.

[0015] As an optional solution for a moving contact assembly, the limiting surface is an arc-shaped surface that can fit the outer wall of the mounting shaft.

[0016] As an optional solution for the moving contact assembly, the elastic member is a compression spring.

[0017] As an optional solution of the moving contact assembly, the thickness of the shaft sleeve is not greater than the depth of the first mounting groove.

[0018] As an optional solution of the moving contact assembly, the opening of the first mounting groove is provided with a rounded corner or a chamfered corner.

[0019] A circuit breaker comprises a housing and a moving contact assembly as described in any of the above schemes, wherein a plurality of the moving contact assemblies are arranged inside the housing, and a plurality of the rotating shafts are linked.

[0020] Beneficial effects:

[0021] On the one hand, the rotating shaft is connected to the actuating mechanism inside the circuit breaker to ensure that the rotating shaft rotates when the circuit breaker has an abnormal current, and further the rotating shaft drives the moving contact to open the circuit breaker, so as to realize the reliable disconnection of the circuit breaker; the bracket is used in this component to realize the abutment limit of the elastic member; the assembly stability between the moving contact and the rotating shaft is realized through the specific matching relationship between the rotating shaft, the mounting shaft, the sleeve and the elastic member. When the component is assembled, the mounting shaft is first passed through the bracket and the moving contact, and the moving contact, the bracket and the mounting shaft are assembled first; further, elastic members are respectively sleeved on both ends of the mounting shaft cantilevered outside the bracket, and one end of the elastic member is abutted against the outer wall of the bracket, and the sleeve is continued to be sleeved on the other side of the elastic member to complete the axial limit of the elastic member, and the sleeve is manually pressed away from the side of the elastic member to compress the elastic member, shorten the distance between the two sleeves on the mounting shaft, and make the two ends of the mounting shaft slide inward along the two opposite first slide grooves respectively until the sleeve is opposite to the first mounting groove. At this time, manually press and release, and under the elastic recovery of the elastic member, the sleeve is assembled in the first installation groove. The first installation groove is used to limit the sleeve to prevent the sleeve from falling out, and further limit the installation shaft reliably. When it is necessary to disassemble this component, you can first use a tool to enter the gap between the sleeve and the bottom wall of the first slide groove, and then press the two sleeves relatively. At this time, the elastic member is compressed, the two sleeves are relatively close, and the sleeve moves out of the first installation groove, further making the installation shaft slide in the opposite direction in the first slide groove, which can realize the separation of the moving contact and the rotating shaft. Finally, the installation shaft is pulled out from the bracket and the moving contact. By using the deformation of the elastic member, the assembly of the entire component is convenient, the assembly efficiency is improved, the assembly difficulty is reduced, and the disassembly of the component is also convenient. Especially under repeated disassembly conditions, compared with the destructive removal form of the existing retaining spring, the elastic member can also achieve non-destructive disassembly, and the parts contained in the component can be reused, avoiding cost waste.

[0022] Secondly, a circuit breaker equipped with the present assembly can improve assembly efficiency and reduce costs during the entire assembly process of the circuit breaker. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a top view of a plurality of moving contact assemblies provided by an embodiment of the utility model;

[0024] Figure 2 It is a top view of a plurality of moving contact assemblies with a hidden part structure provided by an embodiment of the utility model;

[0025] Figure 3 It is a partial cross-sectional view of a moving contact assembly provided by an embodiment of the utility model;

[0026] Figure 4 It is an axonometric view of the rotating shaft provided in the embodiment of the utility model.

[0027] In the figure:

[0028] 1. Moving contact; 2. Bracket; 3. Rotating shaft; 30. Boss; 31. First mounting groove; 32. First sliding groove; 321. Limiting surface; 4. Mounting shaft; 5. Bushing; 6. Elastic member. DETAILED DESCRIPTION

[0029] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only the parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0030] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0031] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0032] In the description of this embodiment, the terms "upper", "lower", "right", etc., are based on the directions or positions shown in the drawings, and are only for the convenience of description and simplified operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0033] Please see attached Figure 1 -Attached Figure 4The first aspect of the present embodiment relates to a moving contact assembly (hereinafter referred to as "assembly"), which includes a moving contact 1, a bracket 2, a rotating shaft 3, a mounting shaft 4, a sleeve 5 and an elastic member 6. The rotating shaft 3 is provided with two opposite first mounting grooves 31 and two opposite first slide grooves 32, and the first mounting groove 31 and the first slide groove 32 located on the same side are connected; one end of the mounting shaft 4 passes through one end of the bracket 2, the moving contact 1 and the other end of the bracket 2 in sequence, and sleeves 5 are respectively sleeved at both ends of the mounting shaft 4, and an elastic member 6 is provided between each sleeve 5 and the outer side of the bracket 2, and the elastic member 6 is sleeved on the mounting shaft 4, and the two ends of the mounting shaft 4 are inserted into the corresponding first slide grooves 32, and the elastic member 6 places the sleeve 5 in the corresponding first mounting groove 31, and the sleeve 5 is spaced from the bottom wall of the first slide groove 32.

[0034] In this embodiment, the rotating shaft 3 is drivingly connected to the actuating mechanism inside the circuit breaker. For example, the connecting rod in the actuating mechanism is hinged to the rotating shaft 3 to ensure that when an abnormal current occurs in the circuit breaker, the tripping movement of the actuating mechanism drives the connecting rod, thereby rotating the rotating shaft 3, and further completing the rotating shaft 3 driving the moving contact 1 to open the gate, thereby realizing reliable disconnection of the circuit breaker; the bracket 2 is used in this component to realize the abutment limit of the elastic member 6; this embodiment realizes the assembly stability between the moving contact 1 and the rotating shaft 3 through the specific matching relationship between the rotating shaft 3, the mounting shaft 4, the sleeve 5 and the elastic member 6.

[0035] Specifically, the bracket 2 is a U-shaped structure as a whole, and the moving contact 1 is clamped at the U-shaped opening of the bracket 2. When the components are assembled, the mounting shaft 4 is first passed through the corresponding mounting holes of the bracket 2 and the moving contact 1, and the moving contact 1, the bracket 2 and the mounting shaft 4 are assembled first; further, elastic parts 6 are respectively sleeved on both ends of the mounting shaft 4 cantilevered outside the bracket 2, and one end of the elastic part 6 is abutted against the outer wall of the bracket 2, and the shaft sleeve 5 is continued to be sleeved on the other side of the elastic part 6 to complete the axial limitation of the elastic part 6, and the shaft sleeve 5 is manually pressed away from the side of the elastic part 6 to compress the elastic part 6, shortening the distance between the two shaft sleeves 5 on the mounting shaft 4, so that the two ends of the mounting shaft 4 slide inward along the two opposite first slide grooves 32 respectively, until When the shaft sleeve 5 is opposite to the first mounting groove 31, it is manually pressed to release, and the shaft sleeve 5 is assembled in the first mounting groove 31 under the elastic recovery action of the elastic member 6. The first mounting groove 31 is used to limit the shaft sleeve 5 to prevent the shaft sleeve 5 from falling out, and further to limit the mounting shaft 4 reliably. When it is necessary to disassemble this component, you can first use a tool to enter the gap between the shaft sleeve 5 and the bottom wall of the first slide groove 32, and then press the two shaft sleeves 5 relatively. At this time, the elastic member 6 is pressurized, the two shaft sleeves 5 are relatively close, and the shaft sleeve 5 is moved out of the first mounting groove 31, further making the mounting shaft 4 slide in the first slide groove 32 in the opposite direction, thereby realizing the separation of the moving contact 1 and the rotating shaft 3. Finally, the mounting shaft 4 is pulled out from the corresponding mounting holes of the bracket 2 and the moving contact 1.

[0036] In this embodiment, the deformation of the elastic member 6 can facilitate the assembly of the entire component, improve assembly efficiency, reduce assembly difficulty, and also facilitate disassembly of the component. Under repeated disassembly conditions, compared with the destructive disassembly of the existing retaining spring, the elastic member 6 can be disassembled without damage, and the parts contained in the component can be reused, avoiding cost waste.

[0037] Optionally, a mounting groove is provided on the rotating shaft 3 , and bosses 30 are respectively provided on two opposite groove walls of the mounting groove, and each boss 30 is respectively provided with a first mounting groove 31 and a first sliding groove 32 .

[0038] In this embodiment, two bosses 30 are integrally formed on two opposite inner side walls of the mounting groove of the rotating shaft 3 , and both the first sliding groove 32 and the first mounting groove 31 are located on the bosses 30 .

[0039] By setting the boss 30, it is possible to avoid the first slide groove 32 and the first mounting groove 31 being directly set on the rotating shaft 3, which would increase the overall wall thickness of the rotating shaft 3 and increase the weight of the parts and the entire product. In addition, the boss 30 can conveniently optimize the relevant dimensions of the first slide groove 32 and the first mounting groove 31.

[0040] Furthermore, the first slide groove 32 is a strip groove with a side wall penetrating through the surface of the boss 30 ; the first mounting groove 31 is a columnar groove matching the shape of the sleeve 5 , and the first slide groove 32 extends into the first mounting groove 31 .

[0041] In this embodiment, the mounting shaft 4 is a cylindrical structure. In order to adapt to the sliding of the two ends of the mounting shaft 4 along the assembly direction, the first slide groove 32 is a strip groove. At the same time, in order to ensure that after the mounting shaft 4 slides into place, the sleeve 5 is directly opposite to the first mounting groove 31, the first slide groove 32 is connected to the first mounting groove 31, and the first slide groove 32 directly extends into the first mounting groove 31; in order to adapt to the cylindrical outer wall of the sleeve 5, the first mounting groove 31 is a columnar groove.

[0042] Optionally, an inner wall of one side of the first sliding groove 32 located in the first installation groove 31 is a limiting surface 321 for limiting the installation shaft 4 .

[0043] In this embodiment, the limiting surface 321 is arranged so that when the installation shaft 4 slides into place, the outer wall of the installation shaft 4 just touches the limiting surface 321, preventing the installation shaft 4 from entering too much into the first sliding groove 32, making it difficult for the first installation groove 31 and the sleeve 5 to maintain a relative state.

[0044] Preferably, the limiting surface 321 is an arc-shaped surface that can fit the outer wall of the installation shaft 4.

[0045] In order to adapt to the shape of the outer wall of the installation shaft 4 , the limiting surface 321 is a partial cylindrical surface. When the installation shaft 4 is in place, the outer wall of one side of the installation shaft 4 fits with the limiting surface 321 .

[0046] Optionally, the elastic member 6 is a compression spring.

[0047] In this embodiment, the elastic member 6 adopts a compression spring, which is a standard part with low cost and is used to withstand the pressing force of the assembler during the assembly process. In this embodiment, by reasonably selecting the adaptation specifications of the compression spring, the manual pressing force of the assembler is reduced as much as possible while ensuring the stability of the assembly, thereby reducing the labor intensity of the assembler.

[0048] Optionally, the thickness of the sleeve 5 is not greater than the depth of the first mounting groove 31 .

[0049] In this embodiment, by making the thickness of the sleeve 5 no greater than the depth of the first mounting groove 31, the elastic member 6 will partially penetrate into the first mounting groove 31, so that the first mounting groove 31 can be used to limit the elastic member 6 to a certain extent, thereby improving the stability of the elastic member 6 when the circuit breaker product is under vibration conditions.

[0050] Optionally, a rounded corner or a chamfer is provided at the opening of the first mounting groove 31 .

[0051] In this embodiment, the matching accuracy between the first mounting groove 31 and the shaft sleeve 5 can be maintained, so that the shaft sleeve 5 can accurately fall into the first mounting groove 31 during the deformation recovery process of the elastic member 6; by providing a rounded corner or a chamfer at the opening of the first mounting groove 31, it is possible to smoothly assemble the shaft sleeve 5 into the first mounting groove 31 even if the matching accuracy between the first mounting groove 31 and the shaft sleeve 5 is not high.

[0052] The second aspect of this embodiment also relates to a circuit breaker, which includes a housing and the above movable contact assembly, wherein a plurality of movable contact assemblies are arranged inside the housing, and a plurality of rotating shafts 3 are linked.

[0053] A circuit breaker equipped with the component can improve assembly efficiency and reduce costs in the entire assembly process of the circuit breaker.

[0054] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the scope of protection of the present invention. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the scope of protection of the claims of the present invention.

Claims

1. A moving contact assembly, comprising a moving contact (1), characterized in that: Also includes: Bracket (2); A rotating shaft (3), wherein the rotating shaft (3) is provided with two opposite first mounting grooves (31) and two opposite first sliding grooves (32), and the first mounting grooves (31) and the first sliding grooves (32) located on the same side are connected; A mounting shaft (4), one end of which passes through one end of the bracket (2), the moving contact (1) and the other end of the bracket (2) in sequence, and shaft sleeves (5) are respectively provided at both ends of the mounting shaft (4), and an elastic member (6) is provided between each shaft sleeve (5) and the outer side of the bracket (2), and the elastic member (6) is sleeved on the mounting shaft (4), and the two ends of the mounting shaft (4) are inserted into the corresponding first sliding groove (32), and the elastic member (6) enables the shaft sleeve (5) to be placed in the corresponding first mounting groove (31), and the shaft sleeve (5) is spaced from the bottom wall of the first sliding groove (32).

2. The moving contact assembly according to claim 1, characterized in that: The rotating shaft (3) is provided with a mounting groove, and two opposite groove walls of the mounting groove are respectively provided with bosses (30), and each boss (30) is respectively provided with the first mounting groove (31) and the first sliding groove (32).

3. The moving contact assembly according to claim 2, characterized in that: The first sliding groove (32) is a strip-shaped groove with a side wall penetrating through the surface of the boss (30).

4. The moving contact assembly according to claim 3, characterized in that: The first mounting groove (31) is a cylindrical groove matching the shape of the shaft sleeve (5), and the first sliding groove (32) extends into the first mounting groove (31).

5. The moving contact assembly according to claim 3, characterized in that: An inner wall of one side of the first sliding groove (32) located inside the first mounting groove (31) is a limiting surface (321) used for limiting the mounting shaft (4).

6. The moving contact assembly according to claim 5, characterized in that: The limiting surface (321) is an arc-shaped surface that can fit the outer wall of the installation shaft (4).

7. The moving contact assembly according to any one of claims 1 to 6, characterized in that: The elastic member (6) is a compression spring.

8. The moving contact assembly according to any one of claims 1 to 6, characterized in that: The thickness of the shaft sleeve (5) is no greater than the depth of the first mounting groove (31).

9. The moving contact assembly according to any one of claims 1 to 6, characterized in that: The opening of the first mounting groove (31) is provided with a rounded corner or a chamfered corner.

10. A circuit breaker, characterized in that It comprises a housing and a moving contact assembly as claimed in any one of claims 1 to 9, wherein a plurality of the moving contact assemblies are arranged inside the housing, and a plurality of the rotating shafts (3) are linked together.

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