Contactor static contact and busbar fixing structure and contactor with busbar

Abstract

The utility model discloses a contactor static contact and busbar fixing structure and a contactor with a busbar, the contactor static contact and busbar fixing structure comprises a static contact and a busbar used for connecting the static contact into an external load loop, and the top of the static contact is provided with a first positioning feature. The bottom of the busbar is provided with a second positioning feature, one of the first positioning feature and the second positioning feature is of a boss structure, the other one is of a groove structure matched with the boss structure, the busbar is in lap joint with the top of the static contact, and the first positioning feature and the second positioning feature are matched in an inserted mode. And the parts directly facing the first positioning feature and the second positioning feature are fixed in a welding manner. According to the utility model, through changing the structures of the static contact and the busbar and adopting a welding process with a more reliable fixing mode, loosening can be prevented, the assembly reliability is ensured, the production efficiency is improved, the cost is reduced, the efficiency is improved, the contact area can be increased, and the contact resistance is reduced.

Description

Technical Field

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

[0002] In the design and application of contactors, the fixed structure of the static contact and the busbar is one of the key factors affecting its performance and reliability. With the rapid development of new energy electric vehicles, the market has higher and higher requirements for the connection reliability between the static contact and the busbar of the contactor.

[0003] Currently, in existing contactors, the static contact usually sets threaded holes or threaded posts to lock with the busbar. The most common locking method is to fix with screws and the threaded holes of the static contact or fix with nuts and the studs of the static contact. This fixing method has at least the following defects: 1. During the operation of the vehicle, due to long-term vibration or temperature changes, the screws are prone to loosen, resulting in unstable connection and even causing electrical accidents; 2. The assembly of the busbar and the static contact requires the use of fasteners, namely screws or nuts, and the installation process is more cumbersome, with low assembly efficiency; 3. The contact surface between the busbar and the static contact is relatively small, only in end-face contact, resulting in a large contact resistance and a high temperature generated when the current flows through. 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 fixed structure of a static contact and a busbar of a contactor and a contactor with a busbar to overcome the defects of unreliable fixed structure, low efficiency and small contact area of the static contact and the busbar of the existing contactor.

[0005] The technical solution adopted by the utility model to solve its technical problems is: a fixed structure of a static contact and a busbar of a contactor, including: a static contact and a busbar for connecting the static contact to an external load circuit. The top of the static contact is provided with a first positioning feature, and the bottom of the busbar is provided with a second positioning feature. One of the first positioning feature and the second positioning feature is a boss structure, and the other is a matching groove structure. The busbar overlaps on the top of the static contact, and the first positioning feature and the second positioning feature are inserted and matched with each other, and are fixed by welding at the position corresponding to the first positioning feature and the second positioning feature.

[0006] As a further improvement of the utility model, the thickness of the welding part on the busbar is less than the thickness of other parts.

[0007] As a further improvement of the utility model, the first positioning feature is a first boss, and the second positioning feature is a second groove. The second groove is arranged at the bottom of the busbar and does not penetrate the busbar upward, so that a welding part is formed at the top of the second groove.

[0008] As a further improvement of the present utility model, the first positioning feature is a first groove, the second positioning feature is a second boss, and a welding groove is provided at the position on the top of the busbar corresponding to the second boss. The bottom of the welding groove and the second boss together form a welding part.

[0009] As a further improvement of the present utility model, a high-energy beam welding process is used to fix between the static contact and the busbar. The high-energy beam penetrates through the welding part to melt it and fuse it with the corresponding part of the static contact.

[0010] As a further improvement of the present utility model, the number of the first positioning features provided on the top of the static contact is one or more, and the number of the second positioning features provided on the bottom of the busbar is the same as that of the first positioning features and corresponds to each other one by one.

[0011] As a further improvement of the present utility model, chamfers are provided along the edges at the upper end of the first positioning feature and / or the lower end of the second positioning feature.

[0012] As a further improvement of the present utility model, the static contact further is provided with a lapping bearing surface distributed around the first positioning feature, and the lapping bearing surface is completely attached to the bottom surface of the busbar.

[0013] As a further improvement of the present utility model, the first positioning feature and the second positioning feature are inserted in an interference fit or clearance fit manner.

[0014] The present utility model further provides a contactor with a busbar, including: at least a pair of static contacts as above and the same number of busbars as the static contacts, and the static contacts and the busbars are welded and fixed in one-to-one correspondence.

[0015] The beneficial effects of the present utility model are as follows:

[0016] 1. The present utility model provides a fixed structure between the static contact and the busbar of a contactor and a contactor with a busbar. By canceling the traditional threaded hole or threaded post structure on the static contact and designing it as a first positioning feature, and at the same time providing a second positioning feature on the busbar, and one of the first positioning feature and the second positioning feature is a boss structure and the other is a groove structure, the mutual insertion and cooperation of the first positioning feature and the second positioning feature are relied on to play a positioning role for assembly, which is convenient for assembly and can ensure the accuracy of the assembly of the busbar and the static contact. At the same time, a more reliable welding method is used for fixing at the position corresponding to the first positioning feature and the second positioning feature, so as to effectively avoid the problem of unreliable connection caused by loosening and reduce the risk of electrical accidents; in addition, since the threaded hole or threaded post structure on the static contact is canceled, the structure of the static contact is simplified, the forming process is simpler, and the assembly efficiency of the static contact and the busbar is higher, realizing cost reduction and efficiency increase;

[0017] 2. Since the fixed structure is adopted for the static contact and the busbar in the present utility model, the contact surface between the static contact and the busbar lies not only in the top surface of the static contact, but also in the contact part between the first positioning feature and the second positioning feature and the welded and fused part, thereby increasing more contact area between the static contact and the busbar, being able to reduce the contact resistance and the temperature generated when the current flows through;

[0018] 3. By reducing the thickness of the welded part in the present utility model, it is convenient to melt and penetrate the welded part to fuse it with the corresponding part of the static contact, shortening the welding time, enabling batch production, and further improving the production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a perspective view of the first embodiment of the fixed structure of the static contact and the busbar of the contactor of the present utility model;

[0020] Figure 2 It is a perspective view of the static contact of the first embodiment of the fixed structure of the static contact and the busbar of the contactor of the present utility model;

[0021] Figure 3 It is a perspective view of the busbar of the first embodiment of the fixed structure of the static contact and the busbar of the contactor of the present utility model;

[0022] Figure 4 It is a sectional view of the first embodiment of the fixed structure of the static contact and the busbar of the contactor of the present utility model;

[0023] Figure 5 It is a perspective view of the first embodiment of the contactor with a busbar of the present utility model;

[0024] Figure 6 It is a sectional view of the first embodiment of the contactor with a busbar of the present utility model;

[0025] Figure 7 It is a perspective view of the second embodiment of the fixed structure of the static contact and the busbar of the contactor of the present utility model;

[0026] Figure 8 It is a perspective view of the static contact of the second embodiment of the fixed structure of the static contact and the busbar of the contactor of the present utility model;

[0027] Figure 9 It is a half sectional view of the busbar of the second embodiment of the fixed structure of the static contact and the busbar of the contactor of the present utility model;

[0028] Figure 10 It is a sectional view of the second embodiment of the fixed structure of the static contact and the busbar of the contactor of the present utility model;

[0029] Figure 11This is a cross-sectional view of the second embodiment of the contactor with a busbar according to the present utility model.

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

[0031] 1. Stationary contact; 101. First boss; 102. First groove; 103. Chamfer;

[0032] 104. Lapping bearing surface; 2. Busbar; 201. Second groove; 202. Second boss; 203. Welding part; 204. Welding groove; 3. Ceramic cover; 4. Moving contact piece. Specific embodiments

[0033] The following describes in detail the preferred embodiments of the present utility model in conjunction with the accompanying drawings.

[0034] Embodiment 1

[0035] Refer to Figures 1 to 4 , this embodiment provides a fixed structure for the stationary contact and the busbar of a contactor, including: a stationary contact 1 and a busbar 2. The busbar 2 is used to connect the stationary contact 1 to an external load circuit, such as a charging and discharging circuit or a main control circuit of an electric vehicle.

[0036] The stationary contact 1 can be, but is not limited to, a cylindrical shape, and a first positioning feature is integrally formed on its top. A second positioning feature is provided at the bottom of one end of the busbar 2, and one of the first positioning feature and the second positioning feature is a boss structure, and the other is a groove structure matching the boss structure. The busbar 2 is lapped on the top of the stationary contact 1, and the first positioning feature and the second positioning feature are inserted and matched with each other, and are fixed by welding at the positions corresponding to the first positioning feature and the second positioning feature.

[0037] In the present utility model, the traditional threaded hole or threaded post structure on the stationary contact 1 is cancelled and designed as the first positioning feature. At the same time, a second positioning feature is provided on the busbar 2. The first positioning feature and the second positioning feature are inserted and matched with each other to play a positioning role for assembly, which is convenient for assembly and can ensure the accuracy of the assembly of the busbar 2 and the stationary contact 1. At the same time, welding, a more reliable fixing method, is used at the positions corresponding to the first positioning feature and the second positioning feature, so as to effectively avoid the problem of unreliable connection caused by loosening and reduce the risk of electrical accidents. In addition, since the threaded hole or threaded post structure on the stationary contact 1 is cancelled, the structure of the stationary contact 1 is simplified, the forming process is simpler, and the assembly efficiency of the stationary contact 1 and the busbar 2 is higher, realizing cost reduction and efficiency improvement.

[0038] It is worth mentioning that, due to the adoption of this fixing structure for the static contact 1 and the busbar 2 in the present utility model, the contact surface between the static contact 1 and the busbar 2 lies not only in the top surface of the static contact 1, but also in the parts where the first positioning feature contacts the second positioning feature and the parts where welding fusion occurs. Thus, more contact area is increased between the static contact 1 and the busbar 2, which can reduce the contact resistance and the temperature generated when current flows through.

[0039] In this embodiment, the first positioning feature is specifically the first boss 101, and the second positioning feature is specifically the second groove 201. The first boss 101 and the second groove 201 are inserted and matched with each other.

[0040] It should be noted that the present utility model does not limit the shapes of the first boss 101 and the second groove 201, which can be but are not limited to circular, semi-circular, polygonal, elliptical or irregularly shaped. The circular shape is preferably selected in this embodiment, which is easy to process and assemble.

[0041] As Figure 4 shown, the second groove 201 is provided at the bottom of the busbar 2 and does not penetrate upward through the busbar 2. Thus, a welding part 203 for welding is formed at the top of the second groove 201. Obviously, the thickness of the welding part 203 on the busbar 2 is smaller than that of other parts. By reducing the thickness of the welding part 203 in the present utility model, a welding device with normal power can be used to melt and penetrate the welding part 203 to fuse it with the corresponding part of the static contact 1, which is convenient for penetration welding, shortens the welding time, and can be mass-produced, further improving the production efficiency.

[0042] Specifically, the static contact 1 and the busbar 2 are fixed by using a high-energy beam welding process. The high-energy beam can be a laser beam or an electron beam, etc. The high-energy beam penetrates downward through the welding part 203 to melt it and fuse it with the first boss 101 of the static contact 1 to achieve welding and fixing. By adopting the above fixing structure and using the high-energy beam welding process for welding and fixing between the static contact 1 and the busbar 2 in the present utility model, a larger welding contact area is formed, which can reduce the contact resistance.

[0043] During the welding process, penetration welding can be directly carried out on the welding part 203 of the busbar 2 through the high-energy beam, or spot welding pre-fixing can be carried out on the welding part 203 of the busbar 2 first, and then penetration welding can be carried out.

[0044] Preferably, the welding part 203 is generally set to be 1 mm to 3 mm, which can ensure the welding strength while facilitating penetration welding.

[0045] In this embodiment, the number of the first positioning features provided at the top of the static contact 1 is one, and the number of the second positioning features provided at the bottom of the busbar 2 is also one. Of course, in other embodiments of the present utility model, the number of the first positioning features provided at the top of the static contact 1 can also be multiple. Correspondingly, the number of the second positioning features provided at the bottom of the busbar 2 is the same as and corresponds to that of the first positioning features one by one. By fitting and welding the multiple first positioning features and the multiple second positioning features one by one, the assembly reliability can be further improved.

[0046] In this embodiment, a chamfer 103 is provided along the edge at the upper end of the first boss 101, which is used to play a guiding role during the assembly of the static contact 1 and the busbar 2, facilitating the assembly. Of course, in other embodiments of the present utility model, a chamfer 103 can also be provided along the edge at the lower end of the second groove 201. Or, chamfers 103 are provided along the edges at the upper end of the first boss 101 and the lower end of the second groove 201 simultaneously, which can achieve the same effect.

[0047] In the present utility model, an interference fit or a clearance fit can be adopted between the first boss 101 and the second groove 201. Among them, when the interference fit is adopted, during the assembly, the busbar 2 can be pre-positioned, playing an axial limiting and fixing role, avoiding the offset of the busbar 2 during welding, and ensuring the accuracy of the assembly of the busbar 2 and the static contact 1. While when the clearance fit is adopted, it is convenient to insert the first boss 101 into the second groove 201, which is easy to operate.

[0048] Furthermore, the first boss 101 is located at the middle position at the top of the static contact 1, and its diameter is smaller than the outer diameter of the static contact 1, so that a lapping bearing surface 104 surrounding the first boss 101 is formed at the top of the static contact 1. The busbar 2 can be a copper bar with a certain thickness, one end of which is in a plate shape, and the second groove 201 is located at the bottom of one end of the plate shape. The lapping bearing surface 104 can completely fit on the bottom surface of one end of the busbar 2 to ensure sufficient contact area and reduce the contact resistance.

[0049] Refer to Figures 1 to 6 , this embodiment also provides a contactor with a busbar, including: at least one pair of static contacts 1 as described above and busbars 2 with the same number as the static contacts 1, and the static contacts 1 and the busbars 2 are welded and fixed in a one-to-one correspondence by using the fixing structure described in the first embodiment.

[0050] In addition, the contactor with a busbar further includes a ceramic cover 3, a push rod assembly, a moving contact piece 4 and an electromagnetic mechanism, all of which are of the prior art. The present application does not limit the specific structures of the push rod assembly and the electromagnetic mechanism, and there are various implementation manners thereof.

[0051] Among them, the number of static contacts 1 can be two, four, etc. according to the requirements of different types of DC contactor products. This application does not limit this. As shown in the attached Figure 5 of the specification of this application, this text takes two static contacts 1 as an example for illustration.

[0052] As Figure 5 and Figure 6 shown, the two static contacts 1 are both fixed on the ceramic cover 3. Specifically, the diameter of the lower section of the main body part of the static contact 1 is smaller than that of its upper section. The lower section of the main body part passes through the mounting hole at the top of the ceramic cover 3 and extends into the interior of the ceramic cover 3. The upper section of the main body part is located at the top of the ceramic cover 3, and an annular welding ring is vertically arranged downward along the bottom edge of the upper section of the main body part. The static contact 1 relies on the welding ring to be brazed and fixed to the top surface of the ceramic cover 3 and achieve sealing.

[0053] Furthermore, the moving contact piece 4 is located inside the ceramic cover 3 and is installed on the push rod assembly. The two ends of the moving contact piece 4 are arranged opposite to the two static contacts 1. The push rod assembly is connected to the electromagnetic mechanism, and the electromagnetic mechanism is used to drive the moving contact piece 4 to move up and down through the push rod assembly to make contact with or disconnect from the two static contacts 1.

[0054] Embodiment 2

[0055] This embodiment provides a fixed structure for the static contact of a contactor and a bus bar. The difference from Embodiment 1 is that:

[0056] The first positioning feature provided at the top of the static contact 1 is the first groove 102, which is located at the middle position of the top of the static contact 1. The top of the static contact 1 is also provided with a lapping bearing surface 104 distributed around the first groove 102. The second positioning feature provided at the bottom of the bus bar 2 is the second boss 202. The bus bar 2 is lapped on the lapping bearing surface 104 of the static contact 1, and the second boss 202 and the first groove 102 are inserted and matched with each other, and are fixed by welding at the position where the second boss 202 and the first groove 102 are located.

[0057] Similarly, the present utility model does not limit the shapes of the first groove 102 and the second boss 202, and they can be, but are not limited to, circular, semi-circular, polygonal, elliptical or irregular special-shaped. This embodiment preferably uses a circular shape, which is easy to process and assemble.

[0058] In addition, at the position on the top of the busbar 2 in this embodiment that is directly opposite to the second boss 202, a welding groove 204 is provided. The bottom of the welding groove 204 and the second boss 202 together form a welding part 203, and the thickness of the welding part 203 is less than the thickness of other parts of the busbar 2. By setting the welding groove 204 to reduce the thickness of the welding part 203, the present utility model can facilitate the high-energy beam to penetrate the welding part 203 from top to bottom to melt it, and fuse it with the bottom of the first groove 102 of the static contact 1 to achieve welding fixation, shorten the welding time, enable batch production, and improve production efficiency.

[0059] Referring to Figures 7 to 11 , this embodiment also provides a contactor with a busbar, including: at least a pair of static contacts 1 as described in Embodiment 2 and the same number of busbars 2 as the static contacts 1. The static contacts 1 and the busbars 2 are welded and fixed in one-to-one correspondence using the fixing structure described in Embodiment 2.

[0060] In addition, the rest of the structure of the contactor with a busbar in this embodiment is the same as that of the contactor with a busbar described in Embodiment 1.

[0061] Thus, it can be seen that for a contactor static contact and busbar fixing structure and a contactor with a busbar of the present utility model, by canceling the traditional threaded hole or threaded post structure on the static contact 1 and instead designing it as a first positioning feature, and at the same time providing a second positioning feature on the busbar 2, and one of the first positioning feature and the second positioning feature is a boss structure and the other is a groove structure, the mutual insertion and cooperation of the first positioning feature and the second positioning feature are relied on to play a positioning role for assembly, facilitating assembly and ensuring the accuracy of the assembly of the busbar 2 and the static contact 1. At the same time, a more reliable welding method is used for fixing at the position directly opposite to the first positioning feature and the second positioning feature, thereby effectively avoiding the problem of unreliable connection caused by loosening and reducing the risk of electrical accidents. In addition, due to the cancellation of the threaded hole or threaded post structure on the static contact 1, the structure of the static contact 1 is simplified, the forming process is simpler, and the assembly efficiency of the static contact 1 and the busbar 2 is higher, achieving cost reduction and efficiency increase. Since the static contact 1 and the busbar 2 in the present utility model adopt this fixing structure, the contact surface between the static contact 1 and the busbar 2 is not only on the top surface of the static contact 1, but also at the part where the first positioning feature and the second positioning feature are in contact and the part where they are welded and fused, thereby increasing more contact areas between the static contact 1 and the busbar 2 and being able to reduce the contact resistance and the temperature generated when the current flows through. By reducing the thickness of the welding part 203, the present utility model facilitates melting and penetrating the welding part 203 to fuse it with the corresponding part of the static contact 1, shortens the welding time, enables batch production, and further improves production efficiency.

[0062] In the above description, many specific details are set forth in order to fully understand 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. All those that do not depart from the content of the technical solution of the present utility model, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present utility model still fall within the scope of protection of the technical solution of the present utility model.

Claims

1. A contactor fixed contact and busbar fixing structure, comprising a fixed contact (1) and a busbar (2) for connecting the fixed contact (1) to an external load circuit, characterized in that: A first positioning feature is provided at the top of the stationary contact (1), and a second positioning feature is provided at the bottom of the busbar (2); one of the first positioning feature and the second positioning feature is a boss structure, and the other is a matching groove structure; the busbar (2) is overlapped on the top of the stationary contact (1), and the first positioning feature and the second positioning feature are plugged into each other, and are fixed by welding at the first positioning feature and the second positioning feature.

2. The contactor fixed contact and busbar fixing structure according to claim 1, characterized in that: The thickness of the welding portion (203) on the busbar (2) is smaller than the thickness of other portions.

3. The contactor fixed contact and busbar fixing structure according to claim 2, characterized in that: The first positioning feature is a first boss (101), and the second positioning feature is a second groove (201). The second groove (201) is arranged at the bottom of the busbar (2) and does not penetrate the busbar (2) upwards, so that the welding part (203) is formed at the top of the second groove (201).

4. The contactor fixed contact and busbar fixing structure according to claim 2, characterized in that: The first positioning feature is a first groove (102), the second positioning feature is a second boss (202), a welding groove (204) is provided at a position on the top of the busbar (2) directly opposite to the second boss (202), and the bottom of the welding groove (204) and the second boss (202) together constitute the welding portion (203).

5. The contactor fixed contact and busbar fixing structure according to claim 2, characterized in that: The stationary contact (1) and the busbar (2) are fixed by a high-energy beam welding process, wherein the high-energy beam penetrates the welding portion (203) to melt it and fuse it with the corresponding portion of the stationary contact (1).

6. The contactor fixed contact and busbar fixing structure according to claim 1, characterized in that: The number of the first positioning features arranged at the top of the stationary contact (1) is one or more, and the number of the second positioning features arranged at the bottom of the busbar (2) is the same as that of the first positioning features and corresponds one to one.

7. The contactor fixed contact and busbar fixing structure according to claim 1, characterized in that: The upper end of the first positioning feature and / or the lower end of the second positioning feature are provided with chamfers (103) along the edges.

8. The contactor fixed contact and busbar fixing structure according to claim 1, characterized in that: The stationary contact (1) is further provided with an overlapping bearing surface (104) distributed around the first positioning feature, and the overlapping bearing surface (104) is completely fitted to the bottom surface of the busbar (2).

9. The contactor fixed contact and busbar fixing structure according to claim 1, characterized in that: The first positioning feature and the second positioning feature are plugged into each other in an interference fit or a clearance fit manner.

10. A contactor with a busbar, characterized in that: include: The contactor fixed contact and busbar fixing structure according to any one of claims 1 to 9, wherein the fixed contacts (1) are provided with at least one pair, and the busbars (2) are the same in number as the fixed contacts (1) and are fixed by welding in a one-to-one correspondence.

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