Double-contact assembly of circuit breaker

Abstract

The utility model relates to a double-contact assembly of a circuit breaker, which comprises a contact frame and a plurality of moving contact groups respectively arranged on the contact frame. The moving contact group comprises two supporting seats arranged in the contact frame side by side, two moving contacts which are rotatably arranged on the two supporting seats respectively and are in linkage fit with the contact frame, knurling shafts arranged on the two moving contacts, and two spring groups symmetrically arranged between the knurling shafts and the contact frame; the spring group comprises a spring seat and a spring which are rotatably arranged on the knurling shaft, one end of the spring is sleeved on a supporting rod of the spring seat, the contact frame is provided with a positioning groove matched with the spring, a positioning boss is arranged in the positioning groove, and the other end of the spring is clamped on the positioning boss. The utility model has the advantages of simple structure, stable and reliable performance, convenient assembly and stable and reliable action.

Description

Technical Field

[0001] The utility model relates to the technical field of circuit breakers, in particular to a double-contact assembly of a circuit breaker. Background Art

[0002] Molded case circuit breakers (MCCBs) are commonly used protective devices that switch load current and protect against overload and short-circuit conditions. They are widely used in various power distribution systems and motors for overload and short-circuit protection. They consist of a base, a cover mounted on the base, an operating mechanism, a contact system, and an arc extinguishing system. Existing circuit breaker contact systems have a complex design for the moving contact assembly, resulting in low operational reliability. Furthermore, these moving contact assemblies are cumbersome to assemble and exhibit unreliable performance. Summary of the Invention

[0003] The purpose of the utility model is to overcome the defects of the prior art and provide a double contact assembly for a circuit breaker with a simple structure, stable and reliable performance, convenient assembly, and smooth and reliable operation.

[0004] To achieve the above-mentioned objectives, the present invention adopts a dual-contact assembly of a circuit breaker, comprising a contact frame, a plurality of movable contact groups respectively arranged on the contact frame, the movable contact group comprising two support seats arranged side by side in the contact frame, two movable contacts respectively rotatably arranged on the two support seats and cooperating with the contact frame, a knurled shaft arranged on the two movable contacts, and two spring groups symmetrically arranged between the knurled shaft and the contact frame, the spring group comprising a spring seat rotatably arranged on the knurled shaft and a spring, one end of the spring being sleeved on the support rod of the spring seat, the contact frame being provided with a positioning groove cooperating with the spring, a positioning boss being provided in the positioning groove, and the other end of the spring being engaged with the positioning boss.

[0005] The above structure has the following beneficial effects: the dual-moving contact design enhances the circuit breaker's breaking capacity and stability. Furthermore, the symmetrical distribution of two spring assemblies ensures smooth and reliable operation of the two moving contacts. The springs are positioned between the spring seat and the positioning boss of the contact frame, ensuring reliable operation of the moving contacts and facilitating assembly of the spring assembly, contact frame, and moving contacts, resulting in higher assembly efficiency. Consequently, the dual-contact assembly of this circuit breaker offers the advantages of a simple structure, stable and reliable performance, convenient assembly, and smooth and reliable operation.

[0006] In particular, two clamping arms are symmetrically provided on the two support bases, and the two clamping arms of the two support bases are respectively provided with positioning holes. One end of the two moving contacts has two connecting portions that are respectively inserted between the two clamping arms of the two support bases, and the two connecting portions are respectively provided with through holes. A rotating shaft is inserted into the positioning holes and the through holes. Two plum blossom retaining rings are provided at both ends of the rotating shaft. Two compression springs are respectively provided between the clamping arms of the two support bases and the two plum blossom retaining rings on the rotating shaft. The two moving contacts are connected to the clamping arms of the two support bases. The compression springs can increase the contact reliability between the clamping arms and the two moving contacts. The two support bases and the two moving contacts are connected by the rotating shaft, which makes assembly more convenient and operation more reliable.

[0007] In particular, a limiting groove is provided on the side of the plum blossom retaining ring facing the compression spring, one end of the compression spring abuts within the limiting groove, and the other end of the compression spring abuts against the clamping arm of the support seat. The compression spring engages within the limiting groove of the plum blossom retaining ring, thereby facilitating assembly of the compression spring and the plum blossom retaining ring and improving assembly efficiency.

[0008] In particular, the contact frame is provided with two shaft positioning slots corresponding to the ends of the shaft. The ends of the shaft are inserted into the two shaft positioning slots, forming a rotational connection between the contact frame and the shaft. The shaft is engaged in the shaft positioning slots of the contact frame, thereby facilitating the assembly of the shaft and the contact frame, making assembly more convenient.

[0009] In particular, the support base is provided with a fixing hole, in which a fastener connected to the base is provided. The support base is connected to the circuit breaker base via the fastener, thereby enabling modular assembly of the dual contact assembly and the base, making assembly more convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 This is a three-dimensional diagram of an embodiment of the present utility model.

[0011] Figure 2 This is an exploded view of an embodiment of the present utility model.

[0012] Figure 3 This is a three-dimensional diagram of the moving contact group of an embodiment of the present utility model.

[0013] Figure 4 This is an exploded view of the moving contact group of an embodiment of the present utility model. DETAILED DESCRIPTION

[0014] like Figures 1 to 4As shown, an embodiment of the present invention is a dual-contact assembly for a circuit breaker, comprising a contact frame 10, three groups of moving contact groups 20 respectively arranged on the contact frame 10, the moving contact group 20 comprising two support seats 21 arranged side by side in the contact frame 10, two moving contacts 22 rotatably arranged on the two support seats 21 and cooperating with the contact frame 10, a knurled shaft 23 provided on the two moving contacts 22, and two groups of spring groups 24 symmetrically arranged between the knurled shaft 23 and the contact frame 10, the spring group 24 comprising a spring seat 241 rotatably provided on the knurled shaft 23 and a spring 242, one end of the spring 242 being sleeved on a support rod 2411 of the spring seat 241, a positioning groove 101 cooperating with the spring 242 being provided on the contact frame 10, a positioning boss 102 being provided in the positioning groove 101, and the other end of the spring 242 being engaged with the positioning boss 102.

[0015] like Figure 3 and 4 As shown, the two support bases 21 are symmetrically provided with two clamping arms 211, each of which is provided with a positioning hole 212. The two movable contacts 22 have two connecting portions 221 at one end that are inserted between the two clamping arms 211 of the two support bases 21. The two connecting portions 221 are respectively provided with a through hole 222. A rotating shaft 25 is inserted into the positioning holes 212 and the through hole 222. Two plum blossom-shaped retaining rings 26 are provided at both ends of the rotating shaft 25. Two compression springs 27 are respectively provided on the rotating shaft 25 between the clamping arms 211 of the two support bases 21 and the two plum blossom-shaped retaining rings 26. The two movable contacts are connected to the clamping arms of the two support bases. The compression springs can increase the contact reliability between the clamping arms and the two movable contacts. The two support bases and the two movable contacts are connected by the rotating shaft, which makes assembly more convenient and operation more reliable. The plum blossom stop ring 26 is provided with a limiting groove 261 on the side facing the compression spring 27. One end of the compression spring 27 abuts in the limiting groove 261, and the other end of the compression spring 27 abuts on the clamping arm 211 of the support seat 21. The compression spring is engaged in the limiting groove of the plum blossom stop ring, thereby facilitating the assembly of the compression spring and the plum blossom stop ring and improving assembly efficiency.

[0016] like Figure 1 and 2As shown, two shaft positioning grooves 103 are provided on the contact frame 10 at the ends of the corresponding shaft 25. The ends of the shaft 25 are inserted into the two shaft positioning grooves 103, forming a rotational connection between the contact frame 10 and the shaft 25. The shaft is engaged with the shaft positioning groove of the contact frame, thereby facilitating the assembly of the shaft and the contact frame, making assembly more convenient. The support base 21 is provided with a fixing hole 213, and a fastener 28 connected to the base is provided in the fixing hole 213. The support base is connected to the circuit breaker base via fasteners, thereby realizing modular assembly of the dual contact assembly and the base, making assembly more convenient.

[0017] The dual-moving contact design enhances the circuit breaker's breaking capacity and stability. The symmetrically distributed two spring assemblies ensure smooth and reliable operation of the two moving contacts. The springs, positioned between the spring seat and the positioning boss on the contact frame, ensure reliable operation of the moving contacts and facilitate assembly of the spring assembly, contact frame, and moving contacts, resulting in higher assembly efficiency. This circuit breaker's dual-contact assembly offers the advantages of a simple structure, stable and reliable performance, easy assembly, and smooth and reliable operation.

Claims

1. A dual contact assembly for a circuit breaker, comprising a contact frame and a plurality of movable contact groups respectively arranged on the contact frame, characterized in that: The moving contact group includes two support seats arranged side by side in the contact frame, two moving contacts rotatably arranged on the two support seats and linked with the contact frame, a knurled shaft arranged on the two moving contacts, and two groups of spring groups symmetrically arranged between the knurled shaft and the contact frame. The spring group includes a spring seat rotatably arranged on the knurled shaft and a spring. One end of the spring is sleeved on the support rod of the spring seat. A positioning groove cooperating with the spring is provided on the contact frame, and a positioning boss is provided in the positioning groove. The other end of the spring is engaged with the positioning boss.

2. The double contact assembly of the circuit breaker according to claim 1, characterized in that: Two clamping arms are symmetrically provided on the two support seats, and positioning holes are respectively provided on the two clamping arms of the two support seats. One end of the two moving contacts has two connecting parts respectively inserted between the two clamping arms of the two support seats, and through holes are respectively provided on the two connecting parts. A rotating shaft is inserted in the positioning holes and the through holes, and two plum blossom stop rings are provided on both ends of the rotating shaft. Two compression springs are respectively provided between the clamping arms of the two support seats and the two plum blossom stop rings on the rotating shaft.

3. The double contact assembly of the circuit breaker according to claim 2, characterized in that: A limiting groove is provided on the side of the plum blossom stop ring facing the compression spring, one end of the compression spring abuts in the limiting groove, and the other end of the compression spring abuts on the clamping arm of the support seat.

4. The double contact assembly of the circuit breaker according to claim 2 or 3, characterized in that: Two rotating shaft positioning grooves are provided on the contact frame at the two ends of the rotating shaft, and the two ends of the rotating shaft are inserted into the two rotating shaft positioning grooves to form a rotating connection between the contact frame and the rotating shaft.

5. The double contact assembly of the circuit breaker according to claim 1 or 2, characterized in that: The support seat is provided with a fixing hole, and a fastener connected to the base is provided in the fixing hole.

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