Static contact structure of direct current contactor

Abstract

The utility model discloses a static contact structure of a direct current contactor, which comprises a static contact body, one end of the static contact body is a contact end, the other end of the static contact body is a locking end, a contact accessory is fixed on the locking end of the static contact body, and the contact accessory is used for locking and fixing with an external electric connecting piece. Therefore, the static contact body can be fixedly connected to an external electric connecting piece through the contact accessory and is electrically conducted. The contact accessory is made of a conductive metal material whose yield strength is higher than that of the static contact body. According to the utility model, the contact accessory with higher yield strength is fixed on the static contact body, so that higher installation torsion can be borne, yield deformation is not easy to occur, the phenomena of back-twisting and screw loose can be effectively avoided, and the installation strength of the direct current contactor is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of contactors, and particularly relates to a static contact structure of a DC contactor. Background Art

[0002] With the rapid development of new energy electric vehicles, the market has an increasing demand for the rated voltage and current of high-voltage DC contactors. To ensure the reliability of the contactor attachment, the installation attachment torque is continuously increased, so certain requirements are put forward for the strength of the static contact thread structure.

[0003] In a high-voltage DC contactor, the static contact is usually directly connected, fixed, and sealed with a ceramic cover through a brazing process. Since the static contact usually uses oxygen-free copper, its material strength is relatively low, which will significantly limit the installation torque of the static contact; at the same time, the thread strength on the static contact is reduced, making it easier to cause torque loss and thread stripping problems. Therefore, it is necessary to improve the existing technology to overcome the defects in the existing technology. Summary of the Utility Model

[0004] The problem to be solved by the utility model is to provide a static contact structure of a DC contactor to overcome the defects of low installation torque, easy torque loss, and thread stripping of the static contact of the existing DC contactor.

[0005] The technical solution adopted by the utility model to solve its technical problems is: a static contact structure of a DC contactor, including: a static contact body, one end of the static contact body is set as a contact end, and the other end is set as an attachment end. A contact accessory is fixed on the attachment end of the static contact body. The contact accessory is used for attachment and fixation with an external electrical connector, so that the static contact body can be fixedly connected to the external electrical connector through the contact accessory and be electrically conducted; wherein, the contact accessory is made of a conductive metal material with a yield strength higher than that of the static contact body.

[0006] As a further improvement of the utility model, the contact accessory is provided with a threaded attachment structure, and the threaded attachment structure is used for fixedly connecting to an external electrical connector through a threaded fastener.

[0007] As a further improvement of the utility model, the threaded attachment structure is a first threaded hole.

[0008] As a further improvement of the utility model, the static contact body is provided with a second threaded hole on its attachment end, and the second threaded hole has the same size as the first threaded hole and is coaxially spliced to form a contact threaded hole.

[0009] As a further improvement of the present utility model, a first boss is formed by the bottom of the contact accessory extending downward around the peripheral area of the first threaded hole. The static contact body is provided with a first groove matching the first boss at its locking end, and a second threaded hole having the same size as the first threaded hole is provided at the bottom of the first groove. The first boss is fixedly inserted into the first groove, the first threaded hole penetrates downward through the first boss, and is coaxially spliced with the second threaded hole to form a contact threaded hole.

[0010] As a further improvement of the present utility model, the contact accessory is in a T shape, and a second boss is provided at its bottom. The first threaded hole extends downward into the second boss and does not penetrate the second boss; the static contact body is provided with a second groove matching the second boss at its locking end, and the second boss is fixedly inserted into the second groove.

[0011] As a further improvement of the present utility model, the threaded locking structure is a threaded post.

[0012] As a further improvement of the present utility model, the contact accessory and the static contact body are fixed by any one of brazing, resistance welding, friction welding, laser welding and threaded connection, or the contact accessory and the static contact body adopt an integral forming technology.

[0013] As a further improvement of the present utility model, the material of the static contact body is oxygen-free copper or copper alloy, and the material of the contact accessory is dispersion copper or zirconium copper.

[0014] As a further improvement of the present utility model, a ring boss is formed by the locking end of the static contact body extending radially. The bottom surface of the contact accessory is closely attached to the top surface of the ring boss, and a welding ring for welding and fixing with the cover of the DC contactor is provided at the outer edge of the bottom of the ring boss.

[0015] The beneficial effects of the present utility model are as follows: The present utility model provides a static contact structure of a DC contactor. By fixing a contact accessory on the locking end of the static contact body, and the contact accessory is made of a conductive metal material with a yield strength higher than that of the static contact body. In this way, the static contact body made of oxygen-free copper and its replaceable materials still extends into the cover body, ensuring that the sealed environment will not be affected. At the same time, the weldability of oxygen-free copper is relatively high, ensuring the reliability of welding and sealing with the cover body, reducing the risk of air leakage, and guaranteeing the service life of the DC contactor. The contact accessory is located outside the cover body. Due to its high yield strength, when it is locked and fixed with an external electrical connector, it can withstand higher installation torque and is not prone to yield deformation, effectively avoiding the phenomena of torque retreat and thread slipping, thereby improving the installation strength of the DC contactor. Description of the Drawings

[0016] Figure 1 It is a perspective view of the first embodiment of the static contact structure of the DC contactor of the present utility model;

[0017] Figure 2 It is an exploded view of the first embodiment of the static contact structure of the DC contactor of the present utility model;

[0018] Figure 3 It is a cross-sectional view of the first embodiment of the static contact structure of the DC contactor of the present utility model;

[0019] Figure 4 It is a perspective view of the assembly of the first embodiment of the static contact structure of the DC contactor of the present utility model and the cover body;

[0020] Figure 5 It is a cross-sectional view of the assembly of the first embodiment of the static contact structure of the DC contactor of the present utility model and the cover body;

[0021] Figure 6 It is a perspective view of the second embodiment of the static contact structure of the DC contactor of the present utility model;

[0022] Figure 7 It is an exploded view of the second embodiment of the static contact structure of the DC contactor of the present utility model;

[0023] Figure 8 It is a cross-sectional view of the second embodiment of the static contact structure of the DC contactor of the present utility model;

[0024] Figure 9 It is a perspective view of the contact accessory of the second embodiment of the static contact structure of the DC contactor of the present utility model;

[0025] Figure 10 It is a perspective view of the third embodiment of the static contact structure of the DC contactor of the present utility model;

[0026] Figure 11 It is an exploded view of the third embodiment of the static contact structure of the DC contactor of the present utility model;

[0027] Figure 12 It is a cross-sectional view of the third embodiment of the static contact structure of the DC contactor of the present utility model;

[0028] Figure 13 It is a perspective view of the contact accessory of the third embodiment of the static contact structure of the DC contactor of the present utility model;

[0029] Figure 14 It is the front view of the fourth embodiment of the static contact structure of the DC contactor of the present utility model.

[0030] The following description is made in conjunction with the accompanying drawings:

[0031] 1. Static contact body; 101. Contact end; 102. Locking end; 103. Second threaded hole; 104. First groove; 105. Second groove; 106. Annular boss; 107. Welding ring; 2. Contact accessory; 201. First threaded hole; 202. First boss; 203. Second boss; 204. Threaded post; 3. Cover body; 12. Contact threaded hole. Detailed implementation manners

[0032] The following will, with reference to the accompanying drawings, give a detailed description of the preferred embodiments of the present utility model.

[0033] Embodiment 1

[0034] Refer to Figures 1 to 5 , the present utility model provides a static contact structure of a DC contactor, including: a static contact body 1. The static contact body 1 can be but is not limited to a cylindrical shape. The lower end of the static contact body 1 is set as the contact end 101. The contact end 101 is usually located inside the cover body 3 of the DC contactor and is used for making or breaking contact with the moving contact piece of the DC contactor. The upper end of the static contact body 1 is set as the locking end 102. The locking end 102 is usually located outside the cover body 3 of the DC contactor and is used for locking and fixing with an external electrical connector such as a copper busbar.

[0035] As one of the important improvements of the present utility model, the static contact structure of the DC contactor further includes a contact accessory 2. The contact accessory 2 is fixed on the locking end 102 of the static contact body 1. The contact accessory 2 is used for locking and fixing with an external electrical connector, so that the static contact body 1 can be fixedly connected to the external electrical connector through the contact accessory 2 and be electrically conducted.

[0036] It is worth mentioning that the contact accessory 2 in the present utility model is made of a conductive metal material with a yield strength higher than that of the static contact body 1.

[0037] Currently, in a DC contactor, in order to reduce the arc length and discharge energy, improve the electrical performance and service life of the contactor, and increase the reliability of the contactor, the moving contact piece and the static contact of the DC contactor are usually separated and combined in a sealed environment filled with a protective gas. The sealed environment is generally formed by enclosing components such as the cover body 3 and the magnetic pole piece. The protective gas filled can be nitrogen or hydrogen, etc. At the same time, in order not to affect the stability of the sealed environment, the static contact is generally made of oxygen-free copper or copper alloy, etc., which has a low oxygen content and will not cause the "hydrogen embrittlement" phenomenon. However, due to the low yield strength of oxygen-free copper, the installation torque of the static contact will be significantly limited.

[0038] In the present utility model, a contact accessory 2 is fixed on the locking end 102 of the static contact body 1, and the contact accessory 2 is made of a conductive metal material with a yield strength higher than that of the static contact body 1. In this way, the static contact body 1 made of oxygen-free copper and its replaceable materials still extends into the interior of the cover body 3, ensuring that the sealed environment will not be affected. At the same time, the solderability of oxygen-free copper is relatively high, guaranteeing the reliability of welding and sealing with the cover body 3, reducing the risk of air leakage, and ensuring the service life of the DC contactor. The contact accessory 2 is located outside the cover body 3. Due to its high yield strength, when it is locked and fixed with an external electrical connector, it can withstand higher installation torque, is not prone to yield deformation, and can effectively avoid the phenomena of torque relaxation and thread stripping, thereby improving the installation strength of the DC contactor.

[0039] Exemplarily, the material of the static contact body 1 of the present utility model can be oxygen-free copper, and of course, it can also be other copper alloy materials replaceable with oxygen-free copper; the material of the contact accessory 2 can be dispersion-strengthened copper (Cu-Al2O3) or zirconium copper, etc., and its yield strength can reach more than 300 MPa.

[0040] Furthermore, the contact accessory 2 is provided with a threaded locking structure, and the threaded locking structure is used to fixedly connect to an external electrical connector through a threaded fastener.

[0041] As Figures 1 to 3 shown, the threaded locking structure in this embodiment is a first threaded hole 201. Correspondingly, the threaded fastener is a screw.

[0042] In this embodiment, the contact accessory 2 is circular, its outer diameter is the same as the outer diameter of the locking end 102 of the static contact body 1, the first threaded hole 201 is located at the center position of the contact accessory 2, and the first threaded hole 201 penetrates through the upper and lower sides of the contact accessory 2.

[0043] Referring to Figure 2 and Figure 3 , the static contact body 1 is provided with a second threaded hole 103 on its locking end 102. The second threaded hole 103 is the same size as the first threaded hole 201 and is coaxially spliced to form a contact threaded hole 12.

[0044] During locking and installation, the static contact body 1 and the contact accessory 2 are fixedly connected to an external electrical connector by screwing a screw into the contact threaded hole 12. During the process of screwing the screw into the contact threaded hole 12, since the initial several turns of threads, that is, the threads in the first threaded hole 201, need to overcome the initial friction between the threads and bear the greatest force, the thickness of the contact accessory 2 needs to meet at least the thickness of 2 to 4 turns of threads. It is worth mentioning that due to the high yield strength of the contact accessory 2 and the fact that it covers the starting threads that receive the most force, the problems of torque relaxation and thread stripping can be further effectively reduced.

[0045] The contact accessory 2 and the static contact body 1 are fixed by any one of brazing, resistance welding, friction welding, laser welding and threaded connection, or the contact accessory 2 and the static contact body 1 are integrally formed by powder metallurgy. In this embodiment, brazing is preferred, and the contact accessory 2 and the static contact body 1 can be brazed and fixed while the static contact body 1 is brazed to the cover 3.

[0046] In order to ensure the consistency between the first threaded hole 201 and the second threaded hole 103 , tapping may be performed after welding.

[0047] See also Figure 3 The locking end 102 of the stationary contact body 1 extends radially to form an annular boss 106 to increase the contact area between the stationary contact body 1 and the contact accessory 2 . The bottom surface of the contact accessory 2 is tightly attached to the top surface of the annular boss 106 .

[0048] A welding ring 107 is provided at the outer edge of the bottom of the annular boss 106 , and the welding ring 107 is used to be welded and fixed to the cover body 3 of the DC contactor.

[0049] Embodiment 2

[0050] See also Figures 6 to 9 The difference between this embodiment and the first embodiment is that the structures of the stationary contact body 1 and the contact attachment 2 are different.

[0051] Specifically, the bottom of the contact accessory 2 extends downward around the peripheral area of ​​the first threaded hole 201 to form an annular first boss 202, so that the contact accessory 2 is T-shaped. More specifically, the main view of the contact accessory 2 is an inverted "convex" shape, and the first threaded hole 201 penetrates downward through the first boss 202.

[0052] The fixed contact body 1 is provided with a first groove 104 matching the first boss 202 on its locking end 102 , and a second threaded hole 103 having the same size as the first threaded hole 201 is provided at the bottom of the first groove 104 , and the inner diameter of the second threaded hole 103 is smaller than that of the first groove 104 .

[0053] Furthermore, the first boss 202 is fixedly inserted in the first groove 104 , and the first threaded hole 201 and the second threaded hole 103 are coaxially spliced ​​to form the contact threaded hole 12 .

[0054] The utility model provides the first boss 202 on the contact accessory 2, so that the length of the first threaded hole 201 is increased, that is, the effective thread in the contact accessory 2 is increased, thereby effectively ensuring the locking strength and being able to withstand a greater locking torque.

[0055] Embodiment 3

[0056] See also Figures 10 to 13, the difference between this embodiment and the first embodiment lies in that the structures of the static contact body 1 and the contact accessory 2 are different.

[0057] Specifically, a second boss 203 is provided at the bottom of the contact accessory 2, and the outer diameter of the second boss 203 is smaller than the outer diameter of the part of the contact accessory 2 other than the second boss 203, so that the contact accessory 2 is in a T shape. More precisely, the front view of the contact accessory 2 is an inverted "convex" shape, and the first threaded hole 201 extends downward into the second boss 203 and does not penetrate the second boss 203.

[0058] A second groove 105 matching the second boss 203 is provided on the locking end 102 of the static contact body 1, and the second boss 203 is fixedly inserted into the second groove 105.

[0059] During locking and installation, by using a screw to be threadedly connected to the first threaded hole 201, the static contact body 1 and the contact accessory 2 can be fixedly connected to an external electrical connector. During the process of screwing the screw into the first threaded hole 201, the thread teeth at the starting end and the ending end are subjected to greater forces, and the greater the locking pre-tightening force, the greater the force borne by the thread teeth at the ending end of the first threaded hole 201. Therefore, in this embodiment, by designing all the threaded holes on the contact accessory 2 with a higher yield strength, the problems of reverse torsion and slipping of the thread can be further effectively reduced.

[0060] Embodiment Four

[0061] Refer to Figure 14 , the difference between this embodiment and the first embodiment lies in that the threaded locking structure provided on the contact accessory 2 is different.

[0062] Specifically, the threaded locking structure in this embodiment is a threaded post 204; correspondingly, the threaded fastener is a nut.

[0063] At this time, there is no need to provide a second threaded hole 103 on the locking end 102 of the static contact body 1, and the end face of the locking end 102 and the bottom face of the contact accessory 2 can be directly welded to make them closely fit together.

[0064] Since the contact accessory 2 is made of a conductive metal material with a yield strength higher than that of the static contact body 1, that is, its top surface and its threaded post 204 have high strength, when it is locked and fixed to an external electrical connector through a nut, it can also withstand higher installation torque and is not prone to yield deformation, effectively avoiding the phenomena of reverse torsion and slipping of the thread.

[0065] It can be seen that in the static contact structure of the DC contactor of the present utility model, a contact accessory 2 is fixed on the locking end 102 of the static contact body 1, and the contact accessory 2 is made of a conductive metal material with a yield strength higher than that of the static contact body 1. In this way, the static contact body 1 made of oxygen-free copper and its alternative materials still extends into the interior of the cover body 3, ensuring that the sealed environment will not be affected. At the same time, the weldability of oxygen-free copper is relatively high, ensuring the reliability of welding and sealing with the cover body 3, reducing the risk of air leakage, and guaranteeing the service life of the DC contactor. The contact accessory 2 is located outside the cover body 3. Due to its high yield strength, when it is locked and fixed with an external electrical connector, it can withstand higher installation torque, is not prone to yield deformation, and can effectively avoid the phenomena of torque relaxation and thread stripping, thereby improving the installation strength of the DC contactor.

[0066] Many specific details are set forth in the above description in order to provide a thorough understanding of the present utility model. However, the above description is only a preferred embodiment of the present utility model, and the present utility model can be implemented in many other ways different from those described herein. Therefore, the present utility model is not limited by the specific embodiments disclosed above. At the same time, any person skilled in the art can make many possible changes and modifications to the technical solution of the present utility model by using the methods and technical contents disclosed above without departing from the scope of the technical solution of the present utility model, or modify it into an equivalent embodiment with equivalent changes. Any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present utility model without departing from the content of the technical solution of the present utility model shall still fall within the scope of protection of the technical solution of the present utility model.

Claims

1. A static contact structure of a DC contactor, comprising a static contact body (1), one end of the static contact body (1) being set as a contact end (101), and the other end thereof being set as a locking end (102), characterized in that: The static contact body (1) is provided with a contact accessory (2) fixed on its locking end (102), and the contact accessory (2) is used to be locked and fixed with an external electrical connector, so that the static contact body (1) can be fixedly connected to the external electrical connector through the contact accessory (2) and electrically conductive; wherein the contact accessory (2) is made of a conductive metal material having a yield strength higher than that of the static contact body (1).

2. The static contact structure of the DC contactor according to claim 1, characterized in that: The contact accessory (2) is provided with a threaded locking structure, and the threaded locking structure is used for fixedly connecting to an external electrical connector via a threaded fastener.

3. The static contact structure of the DC contactor according to claim 2, characterized in that: The thread locking structure is a first threaded hole (201).

4. The static contact structure of the DC contactor according to claim 3, characterized in that: The stationary contact body (1) is provided with a second threaded hole (103) at its locking end (102); the second threaded hole (103) is the same size as the first threaded hole (201) and is coaxially spliced ​​to form a contact threaded hole (12).

5. The static contact structure of the DC contactor according to claim 3, characterized in that: The bottom of the contact accessory (2) extends downward around the peripheral area of ​​the first threaded hole (201) to form a first boss (202); the fixed contact body (1) is provided with a first groove (104) matching the first boss (202) at its locking end (102), and the bottom of the first groove (104) is provided with a second threaded hole (103) of the same size as the first threaded hole (201); the first boss (202) is fixedly inserted in the first groove (104); the first threaded hole (201) penetrates downward through the first boss (202) and is coaxially spliced ​​with the second threaded hole (103) to form a contact threaded hole (12).

6. The static contact structure of the DC contactor according to claim 3, characterized in that: The contact accessory (2) is T-shaped, and a second boss (203) is provided at its bottom, and the first threaded hole (201) extends downward into the second boss (203) and does not penetrate the second boss (203); the static contact body (1) is provided with a second groove (105) matching the second boss (203) at its locking end (102), and the second boss (203) is fixedly inserted in the second groove (105).

7. The static contact structure of the DC contactor according to claim 2, characterized in that: The thread locking structure is a threaded column (204).

8. The static contact structure of the DC contactor according to claim 1, characterized in that: The contact accessory (2) and the stationary contact body (1) are fixed by any one of brazing, resistance welding, friction welding, laser welding and threaded connection, or the contact accessory (2) and the stationary contact body (1) are formed in one piece.

9. The static contact structure of the DC contactor according to claim 1, characterized in that: The material used for the stationary contact body (1) is oxygen-free copper or copper alloy, and the material used for the contact accessory (2) is dispersed copper or zirconium copper.

10. The static contact structure of the DC contactor according to claim 1, characterized in that: The locking end (102) of the static contact body (1) extends radially to form an annular boss (106), the bottom surface of the contact attachment (2) is tightly attached to the top surface of the annular boss (106), and a welding ring (107) for welding and fixing to the cover body (3) of the DC contactor is provided at the bottom outer edge of the annular boss (106).

Images