A contact structure of a parallel double-break molded case circuit breaker

Abstract

The utility model provides a kind of contact structure of parallel double-break point plastic shell circuit breaker, including pivot, the pivot is equipped with installation port, further include contact assembly, the contact assembly includes movable contact rod, pivot shaft and torsion spring, the pivot shaft is installed in installation port, the movable contact rod includes respectively located pivot both sides contact end and limit end, the contact end is used for installing contact, the torsion spring is sleeved on pivot shaft, and one end is abutted on limit end, the other end is abutted on the side of pivot towards contact end, the movable contact rod and torsion spring are both symmetrically provided with two groups, the contact end of two groups of movable contact rod forms double-break point, two groups the movable contact rod are linked in parallel and are all pivoted with pivot and pivot cooperation. The utility model can increase the contact area of contact, reduce loop resistance and can improve breaking capacity.

Description

Technical Field

[0001] This utility model relates to the field of molded case circuit breaker technology, specifically to a contact structure of a parallel double-break molded case circuit breaker. Background Technology

[0002] A molded case circuit breaker is a switching device that can connect, carry, and disconnect current under normal circuit conditions, and can also connect, carry, and disconnect current for a certain time under specified abnormal conditions (such as overload, short circuit, undervoltage, and single-phase ground fault).

[0003] Typically, molded case circuit breakers use a single-break contact system. This structure has the advantages of reliable contact, high electrical stability, and easy adjustment of contact parameters. However, when breaking short-circuit current, the burning and wear of the contacts are very severe, resulting in very limited short-circuit breaking capacity of the single-break contact system molded case circuit breaker. Utility Model Content

[0004] Based on the above problems, the purpose of this utility model is to provide a contact structure that can increase the contact area of ​​the contact points, reduce the circuit resistance, and improve the breaking capacity.

[0005] To address the above problems, the following technical solution is provided: A contact structure for a parallel double-break molded case circuit breaker, comprising a rotating shaft with an installation port, and a contact assembly, the contact assembly comprising a moving contact rod, a pivot shaft, and a torsion spring, the pivot shaft being installed within the installation port, the moving contact rod comprising a contact end and a limiting end located on both sides of the rotating shaft, the contact end being used to install a contact, the torsion spring being sleeved on the pivot shaft, one end abutting against the limiting end, and the other end abutting against the side of the rotating shaft facing the contact end, the moving contact rod and the torsion spring being symmetrically arranged in two sets, the contact ends of the two sets of moving contact rods forming a double break, the two sets of moving contact rods being connected in parallel and both being pivotally connected to the rotating shaft via the pivot shaft.

[0006] In the above structure, the operating mechanism controls the moving contact rod to swing relative to the pivot shaft, enabling the moving contact rod to open and close with the stationary contact system, thus realizing the closing and breaking functions of the circuit breaker. A torsion spring is used to limit the contact of the moving contact rod when it is closed. Two sets of moving contact rods are connected in parallel to form a double-break structure, allowing each moving contact rod to be controlled and operated independently. This circuit breaker structure combines the advantages of single-break circuit breakers (reliable contact, high electrical stability, and easy adjustment of contact parameters) with the advantages of double-break circuit breakers (good arc extinguishing effect). Furthermore, its simple and reasonable structure effectively improves the short-circuit breaking capacity of the molded case circuit breaker. The double-break structure also increases the contact area between the moving contact rod's contact end and the stationary contact, reducing circuit resistance, lowering temperature rise, and improving the safety of this invention. The skin effect of alternating current concentrates the current on the contact surface. Therefore, increasing the surface area of ​​the contacts effectively expands the current flow path, allowing more current to pass through. Simultaneously, a larger surface area improves heat dissipation, resulting in better heat dissipation and preventing excessive heat generation from excessive contact current. This enhances the stability and safety of this invention. The limiting end facilitates engagement with the torsion spring, further improving the stability of the moving contact rod.

[0007] The present invention is further configured such that the ends of the two sets of torsion springs that abut against the rotating shaft are connected together to form an abutment rod.

[0008] The above structure facilitates the production and installation of the torsion spring, and improves the stability of the torsion spring in cooperation with the moving contact rod and the rotating shaft, thereby improving the reliability of this utility model.

[0009] The present invention is further configured such that the mounting port is provided on the side facing the limiting end, and has an insertion port that slides and engages with the pivot shaft.

[0010] The above structure facilitates the assembly of the pivot shaft, thereby improving the ease of assembly of this utility model.

[0011] The present invention is further provided with opposing spacers at the positions where the two sets of moving contact rods are connected to the pivot shaft.

[0012] By adopting the above structure, the connection strength between the moving contact rod and the pivot shaft can be improved, the stability of the moving contact rod swing can be improved, and thus the reliability of this utility model can be improved.

[0013] The present invention is further configured such that the bottom of the limiting end has an abutment interface that abuts against the torsion spring.

[0014] In the above structure, the connection strength between the torsion spring and the moving contact rod can be improved by setting the abutment interface, thereby improving the stability of the moving contact rod and the reliability of this utility model.

[0015] The present invention is further configured such that the torsion spring has an anti-disengagement section located between the two sets of moving contact rods at one end of the abutment interface.

[0016] By adopting the above structure, the stability of the moving contact rod and the torsion spring can be further improved, preventing them from swaying left and right, thus improving the reliability of this utility model.

[0017] The present invention is further configured such that a welding port for welding the contact point is provided at the bottom of the contact end.

[0018] By adopting the above structure, the connection strength of the contacts can be improved, further enhancing the reliability of this utility model.

[0019] The present invention is further configured such that the limiting ends of both sets of moving contact rods extend outward toward the mounting opening to form a flared opening.

[0020] The above structure facilitates the cooperation between the torsion spring and the moving contact rod, and also facilitates the assembly of the moving contact rod, thereby improving the ease of assembly of this utility model. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of the present invention. Figure 1 .

[0022] Figure 2 This is a schematic diagram of the structure of the present invention. Figure 2 .

[0023] Figure 3 This is a schematic diagram of the disassembled structure of this utility model.

[0024] Figure 4 This is a cross-sectional structural diagram of the present invention.

[0025] Figure 5 This is a schematic diagram of the contact assembly in this utility model.

[0026] Figure 6 This is a schematic diagram of the structure of the rotating shaft in this utility model.

[0027] The labels in the diagram have the following meanings: 1-rotating shaft; 11-mounting port; 2-contact assembly; 21-moving contact rod; 22-pivot shaft; 23-torsion spring; 211-contact end; 212-limiting end; 231-abutting rod; 12-insertion port; 213-spacer; 214-abutting interface; 232-anti-disengagement section; 215-welding port; 3-flare. Detailed Implementation

[0028] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit its scope.

[0029] It should be noted that all directional indicators (such as up, down, left, right, front, back, back, etc.) in the embodiments of this utility model are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0030] like Figures 1 to 6 The contact structure of a parallel double-break molded case circuit breaker shown includes a rotating shaft 1 with an installation port 11, and a contact assembly 2. The contact assembly 2 includes a moving contact rod 21, a pivot shaft 22, and a torsion spring 23. The pivot shaft 22 is installed in the installation port 11. The moving contact rod 21 includes a contact end 211 and a limiting end 212 located on both sides of the rotating shaft 1. The contact end 211 is used to install contacts. The torsion spring 23 is sleeved on the pivot shaft 22, with one end abutting against the limiting end 212 and the other end abutting against the side of the rotating shaft 1 facing the contact end 211. Two sets of moving contact rods 21 and torsion springs 23 are symmetrically arranged. The contact ends 211 of the two sets of moving contact rods 21 form a double break. The two sets of moving contact rods 21 are connected in parallel and are both pivotally connected to the rotating shaft 1 through the pivot shaft 22.

[0031] In the above structure, the operating mechanism controls the moving contact rod 21 to swing relative to the pivot shaft 22, enabling the moving contact rod 21 to open and close with the stationary contact system, thus realizing the closing and breaking functions of the circuit breaker. The torsion spring 23 provides a stop limit for the moving contact rod 21 when it is closed. The two sets of moving contact rods 21 are connected in parallel to form a double-break structure, allowing each moving contact rod 21 to be controlled and operated independently. The circuit breaker with this structure has the advantages of reliable contact, high electric stability, and easy adjustment of contact parameters of a single-break circuit breaker, as well as the advantages of good arc extinguishing effect of a double-break circuit breaker. Moreover, its structure is simple and reasonable, which can effectively improve the short-circuit breaking capacity of the molded case circuit breaker. In addition, the double-break structure can increase the contact area between the contact end 211 of the moving contact rod 21 and the stationary contact, which can reduce the circuit resistance, reduce the temperature rise, and improve the safety of this utility model. The skin effect of alternating current concentrates the current on the contact surface. Therefore, increasing the surface area of ​​the contacts effectively expands the current flow path, allowing more current to pass through. Simultaneously, a larger surface area improves heat dissipation speed and effectiveness, preventing excessive heat generation from excessive contact current, thus enhancing the stability and safety of this invention. The limiting end 212 facilitates engagement with the torsion spring 23, further improving the stability of the moving contact rod 21.

[0032] In this embodiment, the two sets of torsion springs 23 are integrally connected at one end to the rotating shaft 1, forming an abutment rod 231.

[0033] The above structure facilitates the production and installation of the torsion spring 23, and improves the stability of the torsion spring 23 in cooperation with the moving contact rod 21 and with the rotating shaft 1, thereby improving the reliability of this utility model.

[0034] In this embodiment, the mounting port 11 has an insertion port 12 on the side facing the limiting end 212, which is slidably engaged with the pivot shaft 22.

[0035] The above structure facilitates the assembly of the pivot shaft 22, thereby improving the ease of assembly of this utility model.

[0036] In this embodiment, spacers 213 are provided at the positions where the two sets of moving contact rods 21 connect with the pivot shaft 22.

[0037] By adopting the above structure, the connection strength between the moving contact rod 21 and the pivot shaft 22 can be improved, the stability of the swing of the moving contact rod 21 can be improved, thereby improving the reliability of this utility model.

[0038] In this embodiment, the bottom of the limiting end 212 is provided with an abutment interface 214 that abuts against the torsion spring 23.

[0039] In the above structure, by setting the abutment interface 214, the connection strength between the torsion spring 23 and the moving contact rod 21 can be improved, thereby improving the stability of the moving contact rod 21 and improving the reliability of this utility model.

[0040] In this embodiment, the torsion spring 23 is provided with an anti-disengagement section 232 located between the two sets of moving contact rods 21 at one end of the abutment interface 214.

[0041] By adopting the above structure, the stability of the moving contact rod 21 and the torsion spring 23 can be further improved, preventing them from swaying left and right, and improving the reliability of this utility model.

[0042] In this embodiment, the bottom of the contact end 211 is provided with a welding port 215 for welding the contact point.

[0043] By adopting the above structure, the connection strength of the contacts can be improved, further enhancing the reliability of this utility model.

[0044] In this embodiment, the limiting ends 212 of both sets of moving contact rods 21 extend outward toward the mounting opening 11 to form an flared opening 3.

[0045] The above structure facilitates the cooperation between the torsion spring 23 and the moving contact rod 21, and also facilitates the assembly of the moving contact rod 21, thereby improving the ease of assembly of this utility model.

[0046] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model. These improvements and modifications assumed above should also be considered within the protection scope of the present utility model.

Claims

1. A contact structure for a parallel double-break molded case circuit breaker, comprising a rotating shaft having an mounting opening thereon, characterized in that: It also includes a contact assembly, which includes a movable contact rod, a pivot shaft, and a torsion spring. The pivot shaft is installed in the mounting port. The movable contact rod includes a contact end and a limiting end located on both sides of the rotating shaft. The contact end is used to install a contact. The torsion spring is sleeved on the pivot shaft, with one end abutting against the limiting end and the other end abutting against the side of the rotating shaft facing the contact end. Two sets of movable contact rods and torsion springs are symmetrically arranged. The contact ends of the two sets of movable contact rods form a double break. The two sets of movable contact rods are connected in parallel and are both pivotally connected to the rotating shaft through the pivot shaft.

2. The contact structure of a molded case circuit breaker with parallel double breaking points according to claim 1, characterized in that: The two sets of torsion springs are connected at one end to the rotating shaft and are integrally formed to form an abutment rod.

3. The contact structure of a molded case circuit breaker with parallel double breaking points according to claim 2, characterized in that: The mounting port has an insertion port that slides into the pivot shaft on the side facing the limiting end.

4. The contact structure of a molded case circuit breaker with parallel double breaking points according to claim 1, characterized in that: The two sets of moving contact rods are provided with opposing spacers at the positions where they connect with the pivot shaft.

5. The contact structure of a molded case circuit breaker with parallel double breaking points according to claim 2, characterized in that: The bottom of the limiting end is provided with an abutment interface that abuts against the torsion spring.

6. The contact structure of a molded case circuit breaker with parallel double breaking points according to claim 5, characterized in that: The torsion spring has an anti-disengagement section located between the two sets of moving contact rods at one end of the abutment interface.

7. The contact structure of a molded case circuit breaker with parallel double breaking points according to claim 1, characterized in that: The bottom of the contact point is provided with a welding port for welding the contact point.

8. The contact structure of a molded case circuit breaker with parallel double breaking points according to claim 2, characterized in that: The limiting ends of both sets of moving contact rods extend outward toward the mounting opening, forming a flared opening.

Images