A movable contact structure of a direct current contactor

Abstract

The utility model discloses a movable contact structure of direct current contactor, this movable contact structure of direct current contactor includes movable contact bridge, movable contact, the movable contact includes contact lever, contact head, the contact head is equipped with from below to above respectively pressure -bearing part, lifting part, and the contact of resistance, movable contact bridge is equipped with at least two through -hole for contact lever to pass, the contact lever is fixed through riveting technology in the back of movable contact bridge, and the contact lever is flush with the surface of movable contact bridge back after riveting. Through the contact head part stage design reduces the damage of electric arc to movable contact, prolongs its life, and the contact head increases the contact area with air, is helpful to improve the heat dissipation performance of movable contact, reduces local overheating, through the riveting technology and ensures that there is even pressure between movable contact and movable contact bridge, is helpful to keep low and stable contact resistance, reduces the generation of electric arc, makes product have prolongs the life, improves heat dissipation performance, improves arc extinguishing performance, and the advantages such as good anti -vibration performance.

Description

Technical Field

[0001] This utility model relates to the field of DC contactor technology, and in particular to a moving contact structure for a DC contactor. Background Technology

[0002] DC contactors play a number of important roles in electrical control systems, mainly including circuit switching, control and protection.

[0003] A DC contactor operates based on electromagnetic principles and consists of an electromagnet, contacts, and a spring. When the electromagnet is energized, it generates a magnetic field that attracts the contacts to close; when the electromagnet loses power, the spring separates the contacts, breaking the circuit.

[0004] Existing DC contactors typically employ an integrated moving contact structure. However, this design has the following drawbacks: the moving contact cannot generate stable contact pressure with the moving contact bridge, leading to increased contact resistance and an increased risk of arcing. Therefore, the applicant has developed a beneficial design and found a solution to the above problems. The technical solution described below was developed in this context. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the moving contact structure design of traditional DC contactors and to provide a product that has extended service life, improved heat dissipation performance, improved arc extinguishing performance, and good vibration resistance.

[0006] To solve the above problems, the present invention adopts the following technical solution.

[0007] A moving contact structure for a DC contactor includes a moving contact bridge and a moving contact. The moving contact includes a contact rod and a contact head. The contact head is provided with a pressure-bearing part, a lifting part, and a contacting part from bottom to top. The moving contact bridge is provided with at least two through holes for the contact rod to pass through. The contact rod is fixed to the back of the moving contact bridge by a riveting process. After riveting, the contact rod is flush with the surface of the back of the moving contact bridge.

[0008] Preferably, the moving contact bridge has a connecting hole and is disposed between two through holes.

[0009] Preferably, one end of the through hole is provided with a countersunk hole to accommodate the contact rod after riveting.

[0010] Preferably, the diameter of the contacting part is larger than the diameter of the raised part, and the diameter of the contacting part is smaller than the diameter of the pressure-bearing part.

[0011] Beneficial effects:

[0012] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0013] (1) This utility model, by designing the contact head in stages, allows the current to gradually increase during the closing process and gradually decrease during the opening process. This can effectively manage the electric arc and reduce the damage of the electric arc to the moving contact. Due to the reduction of the electric arc effect, the wear rate of the moving contact is slowed down, so the service life of the moving contact can be extended. Moreover, the staged design increases the contact area with air, which helps to improve the heat dissipation performance of the moving contact and reduce local overheating.

[0014] (2) This utility model ensures uniform pressure between the moving contact and the moving contact bridge through the riveting process, which helps to maintain low and stable contact resistance and reduce the generation of electric arc. In addition, the flush design between the tail of the contact rod and the back of the moving contact bridge increases mechanical stability and reduces vibration and displacement that may occur during operation or use. Attached Figure Description

[0015] Figure 1 This is a side cross-sectional view of the moving contact structure of a DC contactor according to the present invention;

[0016] The correspondence between the labels and component names in the attached figures is as follows:

[0017] Reference numerals: 1. Moving contact bridge; 2. Moving contact; 11. Through hole; 12. Connecting hole; 13. Countersunk hole; 21. Contact rod; 22. Contact head; 23. Pressure bearing part; 24. Raised part; 25. Abutting part. Detailed Implementation

[0018] The technical solution of this utility model will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0019] In the description of this utility model, it should be understood that the terms "upper", "lower", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0020] In this embodiment of the utility model, "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0021] Reference example Figure 1 A moving contact structure for a DC contactor includes a moving contact bridge 1 and a moving contact 2. The moving contact 2 includes a contact rod 21 and a contact head 22. The contact head 22 has a pressure-bearing part 23, a raised part 24, and a contacting part 25 from bottom to top. The moving contact bridge 1 has at least two through holes 11 for the contact rod 21 to pass through. The contact rod 21 is fixed to the back of the moving contact bridge 1 by a riveting process. After riveting, the contact rod 21 is flush with the surface of the back of the moving contact bridge 1. By designing the contact head 22 in stages, the current gradually increases during the closing process and gradually decreases during the opening process. This can effectively manage the electric arc and reduce the damage of the electric arc to the moving contact 2. Due to the reduction of the electric arc effect, the wear rate of the moving contact 2 is slowed down, so the service life of the moving contact 2 can be extended. Moreover, the staged design increases the contact area with air, which helps to improve the heat dissipation performance of the moving contact 2 and reduce local overheating.

[0022] It is worth mentioning that the moving contact bridge 1 is provided with a connection hole 12 and is located between two through holes 11. The connection hole 12 is used to connect to the push rod of the DC contactor.

[0023] It is worth mentioning that one end of the through hole 11 is provided with a countersunk hole 13 to accommodate the contact rod 21 after riveting;

[0024] It is worth mentioning that the diameter of the contact part 25 is larger than the diameter of the raised part 24, and the diameter of the contact part 25 is smaller than the diameter of the pressure-bearing part 23. The riveting process ensures that there is uniform pressure between the moving contact 2 and the moving contact bridge 1, which helps to maintain a low and stable contact resistance and reduce the generation of electric arc. In addition, the flush design between the tail of the contact rod 21 and the back of the moving contact bridge 1 increases mechanical stability and reduces vibration and displacement that may occur during operation or use.

[0025] The above design scheme can enable the product to achieve the advantages of extended service life, improved heat dissipation performance, improved arc extinguishing performance, and good vibration resistance.

[0026] The above description, in conjunction with specific embodiments, provides a further detailed explanation of the present utility model. It should not be construed that the specific implementation of the present utility model is limited to these descriptions. For those skilled in the art, several simple deductions or substitutions can be made without departing from the concept of the present utility model, and all such deductions or substitutions should be considered to fall within the scope of protection defined by the claims submitted by the present utility model.

Claims

1. A moving contact structure for a DC contactor, comprising a moving contact bridge (1) and a moving contact (2), characterized in that: The moving contact (2) includes a contact rod (21) and a contact head (22). The contact head (22) is provided with a pressure bearing part (23), a lifting part (24), and a contacting part (25) from bottom to top. The moving contact bridge (1) is provided with at least two through holes (11) for the contact rod (21) to pass through. The contact rod (21) is fixed to the back of the moving contact bridge (1) by a riveting process. After riveting, the contact rod (21) is flush with the surface of the back of the moving contact bridge (1).

2. The moving contact structure of the DC contactor according to claim 1, characterized in that: The moving contact bridge (1) is provided with a connecting hole (12) and is located between two through holes (11).

3. The moving contact structure of the DC contactor according to claim 1, characterized in that: One end of the through hole (11) is provided with a countersunk hole (13) to accommodate the contact rod (21) after riveting.

4. The moving contact structure of the DC contactor according to claim 1, characterized in that: The diameter of the contact part (25) is larger than the diameter of the raised part (24), and the diameter of the contact part (25) is smaller than the diameter of the pressure-bearing part (23).

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