A double contact mechanism and circuit breaker independent of each other

Abstract

The disclosure provides a double-contact mechanism and a circuit breaker independent of each other, by arranging two sets of contact assemblies independent of each other, each contact assembly comprising a contact and a contact torsion spring for providing torsion to the contact, so that the actions and pressures of the two contacts in the circuit opening and closing process are completely independent of each other, and even if the two contacts have inconsistent arc ablation degrees after experiencing electrical life tests, the contact torsion springs can independently adjust the working angles according to the actual ablation of the corresponding contact, and continuously provide sufficient contact pressure, thereby effectively avoiding the problems of insufficient terminal pressure, increased contact resistance and excessively high temperature rise caused by serious ablation of the common tension spring in the prior art, and significantly improving the reliability and safety of the circuit breaker. Meanwhile, through the cooperation of the reset torsion spring, the first limiting boss and the first limiting slot on the contact support, the contact support can be reliably reset.

Description

Technical Field

[0001] This disclosure relates to the field of circuit breaker technology, and more particularly to a dual-contact mechanism and circuit breaker that are independent of each other. Background Technology

[0002] Currently, double-break circuit breakers are widely used in the low-voltage electrical appliance field. They improve the breaking capacity and safety of the circuit breaker by setting two breaking points. In the traditional double-break circuit breaker structure, the two contacts usually share a single contact spring mechanism to achieve contact closure and opening.

[0003] While this design, which uses a single spring, is relatively simple in structure, it has significant drawbacks in actual operation. After the circuit breaker undergoes electrical life testing or long-term use, the two contacts often exhibit inconsistent degrees of arc erosion. Because they share a single tension spring, the pressure provided by the spring cannot be independently adjusted according to the actual erosion condition of each contact. This results in insufficient final pressure on the more severely eroded contact, increased contact resistance, and consequently, excessively high local temperatures. Under long-term operation, this not only affects the electrical performance of the circuit breaker but also poses a risk of overheating and burnout, reducing the reliability and safety of the product. Utility Model Content

[0004] In view of this, the purpose of this disclosure is to propose a dual-contact mechanism and circuit breaker that are independent of each other, so as to solve the technical problems in the prior art.

[0005] To achieve the above objectives, as a first aspect of this utility model, a dual-contact mechanism that is independent of each other is provided, applied to a circuit breaker, comprising:

[0006] The housing is provided with a first mounting boss and a first limiting boss;

[0007] The handle is hinged to the housing.

[0008] The contact support is rotatably mounted on the first mounting boss. One end is connected to the handle via a connector, and the other end is provided with two mutually symmetrical second mounting bosses. Two second limiting grooves are symmetrically provided on both sides. The second limiting grooves are adapted to the positions of the second mounting bosses. The side of the contact support is also provided with a first limiting groove adapted to the position of the first mounting boss.

[0009] Two sets of symmetrically arranged contact components, each set of contact components includes a contact that is rotatably sleeved on the second mounting boss and a contact torsion spring that is sleeved on the second mounting boss and whose two ends respectively abut against the second limiting groove and the contact.

[0010] A reset torsion spring is sleeved on the first mounting boss, with its two ends abutting against the first limiting boss and the first limiting groove, respectively.

[0011] As an optional implementation, the connector includes a handle push rod, a jump buckle, and a jump buckle fixing shaft. The contact support is provided with a mounting pin hole. The jump buckle fixing shaft is fixedly installed in the mounting pin hole. One end of the jump buckle is sleeved on the jump buckle fixing shaft, and the other end is hinged to one end of the handle push rod. The other end of the handle push rod is hinged to the handle.

[0012] As an optional implementation, it also includes a center pin. The center of the first mounting boss is provided with a first mounting hole, and the contact support is provided with a second mounting hole. One end of the center pin is fixedly installed in the first mounting hole, and the other end is rotatably installed in the second mounting hole.

[0013] As an optional implementation, the contact is elongated and has a third mounting hole at one end, through which the contact is rotatably fitted onto the second mounting boss.

[0014] As an optional implementation, the sidewall of the contact near the third mounting hole protrudes outward to form a first limiting part, and a second limiting part is formed at the corresponding position of the contact support. The rotation range of the contact is limited by the adaptation of the first limiting part and the second limiting part.

[0015] As an optional implementation, the sidewall of the contact end away from the third mounting hole protrudes outward to form a contact portion on the side facing the conductive copper sheet of the circuit breaker.

[0016] As an alternative implementation, a portion of the sidewall of the contact protrudes outward to form a welding boss, the surface of which has an uneven design.

[0017] As an optional implementation, the housing is further provided with a second limiting boss, the position of which is adapted to the position of the first limiting groove. The side wall of the first limiting groove is provided with a guide ramp adapted to the position of the second limiting boss, so that when the assembly contact is supported, the end of the reset torsion spring abutting against the second limiting boss transitions into the first limiting groove.

[0018] As a second aspect of this utility model, a circuit breaker is provided, including a double contact mechanism, the double contact mechanism being an independent double contact mechanism as described above.

[0019] As can be seen from the above, in this embodiment of the utility model, by setting two sets of independent contact components, each contact component includes a contact and a contact torsion spring that provides torque to the contact, the actions and pressures of the two contacts during the circuit opening and closing process are completely independent of each other. After undergoing electrical life testing, even if the two contacts are inconsistent in degree of arc erosion, each contact torsion spring can independently adjust its working angle according to the actual erosion condition of its corresponding contact, continuously providing sufficient contact pressure. This effectively avoids the problems of insufficient final pressure, increased contact resistance, and excessive temperature rise caused by the shared tension spring in the prior art, significantly improving the reliability and safety of the circuit breaker. At the same time, the cooperation between the reset torsion spring and the first limiting boss and the first limiting groove on the contact support ensures that the contact support can be reliably reset. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in this disclosure or related technologies, the accompanying drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, the accompanying drawings described below are only embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the independent dual-contact mechanisms (open state) according to an embodiment of this disclosure;

[0022] Figure 2 This is a schematic diagram of the independent dual-contact mechanisms (closed state) according to an embodiment of this disclosure;

[0023] Figure 3 This is a schematic diagram of the housing according to an embodiment of the present disclosure;

[0024] Figure 4 for Figure 3 Detailed drawing of Part A (excluding the return torsion spring);

[0025] Figure 5 for Figure 3 Detailed drawing of Part A (including the return torsion spring);

[0026] Figure 6 This is an assembly diagram showing the relationship between the contact support and the contact assembly according to an embodiment of this disclosure;

[0027] Figure 7 This is a three-dimensional structural diagram of the contact support in an embodiment of the present disclosure.

[0028] Figure 8 This is a three-dimensional structural diagram of the contact support in an embodiment of the present disclosure from another perspective.

[0029] Figure 9This is a three-dimensional structural diagram of the contact in an embodiment of the present disclosure.

[0030] In the figure, 10 is the housing; 11 is the first mounting boss; 12 is the first limiting boss; 13 is the second limiting boss; 14 is the first mounting hole; 20 is the handle; 30 is the connector; 31 is the handle push rod; 32 is the jump buckle; 33 is the jump buckle fixing shaft; 40 is the contact support; 41 is the second mounting boss; 42 is the second limiting groove; 43 is the first limiting groove; 44 is the guide ramp; 45 is the mounting pin hole; 46 is the second limiting part; 47 is the second mounting hole; 50 is the contact assembly; 51 is the contact; 511 is the third mounting hole; 512 is the first limiting part; 513 is the contact part; 514 is the welding boss; 52 is the contact torsion spring; 60 is the reset torsion spring; 70 is the center pin; and 80 is the conductive copper sheet. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of this disclosure clearer, the following detailed description is provided in conjunction with specific embodiments and the accompanying drawings.

[0032] It should be noted that, unless otherwise defined, the technical or scientific terms used in the embodiments of this disclosure should have the ordinary meaning understood by one of ordinary skill in the art to which this disclosure pertains. The terms "first," "second," and similar terms used in the embodiments of this disclosure do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0033] As one embodiment of this utility model, a circuit breaker is provided, such as... Figure 1-9 As shown, it includes a dual-contact mechanism, which is an independent dual-contact mechanism, comprising:

[0034] The housing 10 is provided with a first mounting boss 11 and a first limiting boss 12;

[0035] The handle 20 is hinged to the housing 10;

[0036] The contact support 40 is rotatably mounted on the first mounting boss 11. One end is connected to the handle 20 through the connector 30, and the other end is provided with two mutually symmetrical second mounting bosses 41. Two second limiting grooves 42 are symmetrically provided on both sides. The second limiting grooves 42 are adapted to the positions of the second mounting bosses 41. The side of the contact support 40 is also provided with a first limiting groove 43 adapted to the position of the first mounting boss 11.

[0037] Two sets of symmetrically arranged contact components 50, each set of contact components 50 includes a contact 51 rotatably sleeved on the second mounting boss 41 and a contact torsion spring 52 sleeved on the second mounting boss 41, with its two ends respectively abutting against the second limiting groove 42 and the contact 51;

[0038] The reset torsion spring 60 is sleeved on the first mounting boss 11, with its two ends abutting against the first limiting boss 12 and the first limiting groove 43, respectively.

[0039] In the embodiments of this utility model, such as Figure 6 As shown, by setting two independent contact components 50, each contact component 50 includes a contact 51 and a contact torsion spring 52 that provides torque to the contact 51, the actions and pressures of the two contacts 51 during the circuit opening and closing process are completely independent of each other. After the electrical life test, even if the two contacts 51 are inconsistent due to the degree of arc erosion, each contact torsion spring 52 can independently adjust its working angle according to the actual erosion condition of its corresponding contact 51, and continuously provide sufficient contact pressure. This effectively avoids the problems of insufficient final pressure, increased contact resistance and excessive temperature rise caused by the shared tension spring in the prior art, which are caused by severe erosion. This significantly improves the reliability and safety of the circuit breaker. At the same time, the cooperation between the reset torsion spring 60 and the first limiting boss 12 and the first limiting groove 43 on the contact support 40 ensures that the contact support 40 can be reliably reset.

[0040] As an optional implementation method, such as Figure 2 As shown, the connector 30 includes a handle push rod 31, a jump buckle 32, and a jump buckle fixing shaft 33. The contact support 40 has a mounting pin hole 45. The jump buckle fixing shaft 33 is fixedly installed in the mounting pin hole 45. One end of the jump buckle 32 is sleeved on the jump buckle fixing shaft 33, and the other end is hinged to one end of the handle push rod 31. The other end of the handle push rod 31 is hinged to the handle 20. This structure provides a stable and reliable transmission chain, effectively transmitting the operating force of the handle 20 to the contact support 40, controlling its rotation, and thereby driving the two contacts 51 to synchronously open and close. This combination of hinge and sleeve structure ensures smooth power transmission and the accuracy of the mechanism's action, enhancing the mechanical stability and response consistency of the entire operating mechanism.

[0041] As an optional implementation method, such as Figure 4-5 As shown, it also includes a central pin 70. A first mounting hole 14 is provided at the center of the first mounting boss 11, and a second mounting hole 47 is provided on the contact support 40. One end of the central pin 70 is fixedly installed in the first mounting hole 14, and the other end is rotatably installed in the second mounting hole 47. Thus, the contact support 40 is rotatably mounted on the first mounting boss 11 of the housing 10 via the central pin 70. This rotatable connection method is simple and reliable, effectively limiting the radial movement of the contact support 40 during operation, ensuring the stability and consistency of its rotation trajectory, reducing unnecessary friction and wear, and helping to extend the service life of the mechanism.

[0042] As an optional implementation method, such as Figure 9 As shown, the contact 51 is elongated and has a third mounting hole 511 at one end. The contact 51 is rotatably fitted onto the second mounting boss 41 through the third mounting hole 511. In this way, the contact 51 has a simple structure, is easy to assemble, and ensures that each contact 51 can rotate flexibly and reliably around its respective rotation center.

[0043] As an optional implementation method, such as Figure 6-8 As shown, the contact 51 has a first limiting portion 512 protruding outward from one end of its sidewall near the third mounting hole 511. A second limiting portion 46 is formed at the corresponding position on the contact support 40. The adaptation of the first limiting portion 512 and the second limiting portion 46 limits the rotation range of the contact 51. Thus, the cooperation between the first limiting portion 512 on the contact 51 and the second limiting portion 46 on the contact support 40 provides a mechanical limit on the rotation range of the contact 51, preventing excessive rotation of the contact 51 under the action of the torsion spring, ensuring accurate working position, and also providing protection during installation and impact, preventing damage to internal components due to excessive displacement, thereby improving the stability and durability of the mechanism.

[0044] As an optional implementation method, such as Figure 6-8 As shown, the sidewall of the contact 51, away from the third mounting hole 511, protrudes outward to form a contact portion 513 on the side facing the conductive copper sheet 80 of the circuit breaker. Thus, by providing a specially protruding contact portion 513 at the end of the contact 51, the effective contact area with the conductive copper sheet 80 of the circuit breaker is increased, which can reduce contact resistance and reduce heat generation during energization. At the same time, the protruding structure also facilitates the burning and extinguishing of the electric arc in a specific area, protecting other parts of the contact 51 to a certain extent, reducing overall erosion, and improving electrical life performance.

[0045] As an optional implementation method, such as Figure 9As shown, a portion of the sidewall of the contact 51 protrudes outward to form a welding boss 514, the surface of which is designed with concave and convex surfaces. Thus, by providing the welding boss 514 with concave and convex surfaces on the contact 51 for welding to external conductive components during assembly, the concave and convex surface design significantly increases the surface area of ​​the welding point, effectively enhancing welding strength and reliability, preventing weld breakage during long-term use or under short-circuit electrodynamic forces, and improving the stability and mechanical robustness of the electrical connection.

[0046] As an optional implementation method, such as Figure 3-5 As shown, the housing 10 is further provided with a second limiting boss 13, the position of which is adapted to the position of the first limiting groove 43. A guide ramp 44 adapted to the position of the second limiting boss 13 is provided on the side wall of the first limiting groove 43, so that when assembling the contact support 40, the end of the return torsion spring 60 abutting against the second limiting boss 13 transitions into the first limiting groove 43. Thus, by providing a second limiting boss 13 on the housing 10 and a guide ramp 44 on the side wall of the first limiting groove 43 of the contact support 40, the assembly process of the return torsion spring 60 is greatly simplified. During assembly, the reset torsion spring 60 is first sleeved on the first mounting boss 11, and its two ends are fixed on the first limiting boss 12 and the second limiting boss 13 respectively. During the installation of the contact support 40, the guide ramp 44 will guide the end of the torsion spring to slide smoothly and automatically into and finally lock into the first limiting groove 43. This structure realizes the quick and accurate installation of the reset torsion spring 60, improves the production assembly efficiency, and reduces the difficulty and error rate of manual assembly.

[0047] As another embodiment of this utility model, such as Figure 1-9 As shown, a dual-contact mechanism that is independent of each other is provided, the dual-contact mechanism comprising:

[0048] The housing 10 is provided with a first mounting boss 11 and a first limiting boss 12;

[0049] The handle 20 is hinged to the housing 10;

[0050] The contact support 40 is rotatably mounted on the first mounting boss 11. One end is connected to the handle 20 through the connector 30, and the other end is provided with two mutually symmetrical second mounting bosses 41. Two second limiting grooves 42 are symmetrically provided on both sides. The second limiting grooves 42 are adapted to the positions of the second mounting bosses 41. The side of the contact support 40 is also provided with a first limiting groove 43 adapted to the position of the first mounting boss 11.

[0051] Two sets of symmetrically arranged contact components 50, each set of contact components 50 includes a contact 51 rotatably sleeved on the second mounting boss 41 and a contact torsion spring 52 sleeved on the second mounting boss 41, with its two ends respectively abutting against the second limiting groove 42 and the contact 51;

[0052] The reset torsion spring 60 is sleeved on the first mounting boss 11, with its two ends abutting against the first limiting boss 12 and the first limiting groove 43, respectively.

[0053] In this embodiment of the invention, by setting two sets of independent contact components 50, each contact component 50 includes a contact 51 and a contact torsion spring 52 that provides torque to the contact 51, the actions and pressures of the two contacts 51 during the circuit opening and closing process are completely independent of each other. After undergoing an electrical life test, even if the two contacts 51 show inconsistent degrees of arc erosion, each contact torsion spring 52 can independently adjust its working angle according to the actual erosion condition of its corresponding contact 51, continuously providing sufficient contact pressure. This effectively avoids the problems of insufficient final pressure, increased contact resistance, and excessive temperature rise caused by the shared tension spring in the prior art, significantly improving the reliability and safety of the circuit breaker. At the same time, the cooperation between the reset torsion spring 60 and the first limiting boss 12 and the first limiting groove 43 on the contact support 40 ensures that the contact support 40 can be reliably reset.

[0054] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of this disclosure (including the claims) is limited to these examples; within the framework of this disclosure, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of different aspects of the embodiments of this disclosure as described above, which are not provided in detail for the sake of brevity.

[0055] This disclosure is intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this disclosure should be included within the scope of protection of this disclosure.

Claims

1. A dual-contact mechanism that operates independently of each other, applied to a circuit breaker, characterized in that, include: The housing is provided with a first mounting boss and a first limiting boss; The handle is hinged to the housing. The contact support is rotatably mounted on the first mounting boss. One end is connected to the handle via a connector, and the other end is provided with two mutually symmetrical second mounting bosses. Two second limiting grooves are symmetrically provided on both sides. The second limiting grooves are adapted to the positions of the second mounting bosses. The side of the contact support is also provided with a first limiting groove adapted to the position of the first mounting boss. Two sets of symmetrically arranged contact components, each set of contact components includes a contact that is rotatably sleeved on the second mounting boss and a contact torsion spring that is sleeved on the second mounting boss and whose two ends respectively abut against the second limiting groove and the contact. A reset torsion spring is sleeved on the first mounting boss, with its two ends abutting against the first limiting boss and the first limiting groove, respectively.

2. The independent dual-contact mechanism according to claim 1, characterized in that, The connector includes a handle push rod, a jump buckle, and a jump buckle fixing shaft. The contact support is provided with a mounting pin hole. The jump buckle fixing shaft is fixedly installed in the mounting pin hole. One end of the jump buckle is sleeved on the jump buckle fixing shaft, and the other end is hinged to one end of the handle push rod. The other end of the handle push rod is hinged to the handle.

3. The independent dual-contact mechanism according to claim 1, characterized in that, It also includes a center pin, the center of the first mounting boss is provided with a first mounting hole, the contact support is provided with a second mounting hole, one end of the center pin is fixedly installed in the first mounting hole, and the other end is rotatably installed in the second mounting hole.

4. The independent dual-contact mechanism according to claim 1, characterized in that, The contact is elongated and has a third mounting hole at one end. The contact is rotatably fitted onto the second mounting boss through the third mounting hole.

5. The independent dual-contact mechanism according to claim 4, characterized in that, The contact protrudes outward from one end of its sidewall near the third mounting hole to form a first limiting part, and a second limiting part is formed at the corresponding position of the contact support. The rotation range of the contact is limited by the adaptation of the first limiting part and the second limiting part.

6. The independent dual-contact mechanism according to claim 4, characterized in that, The sidewall of the contact, which is away from the third mounting hole, protrudes outward toward the conductive copper sheet of the circuit breaker to form a contact portion.

7. The independent dual-contact mechanism according to claim 1, characterized in that, A portion of the sidewall of the contact protrudes outward to form a welding boss, and the surface of the welding boss has a concave-convex design.

8. The independent dual-contact mechanism according to claim 1, characterized in that, The housing is also provided with a second limiting boss, the position of which is adapted to the position of the first limiting groove. The side wall of the first limiting groove is provided with a guide ramp adapted to the position of the second limiting boss, so that when the assembly contact is supported, the end of the reset torsion spring abutting against the second limiting boss transitions into the first limiting groove.

9. A circuit breaker, characterized in that, It includes a dual-contact mechanism, which is an independent dual-contact mechanism as described in any one of claims 1-8.

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