Fixed structure of static contact and electric connecting piece and direct current contactor with electric connecting piece

Abstract

The utility model discloses a fixed contact and electric connecting piece fixing structure and a DC contactor with an electric connecting piece, the fixed contact and electric connecting piece fixing structure comprises a fixed contact and an electric connecting piece used for connecting the fixed contact into an external load loop, and the top of the fixed contact is provided with an assembly boss vertically protruding upwards. The static contact is also provided with a step surface which is distributed around the assembling boss by a circle; the electric connecting piece is provided with an assembling hole penetrating through the top face and the bottom face of the electric connecting piece, an annular inner flange with the thickness smaller than the depth of the assembling hole is arranged in the assembling hole, the assembling boss is inserted into the assembling hole, the step face is made to be completely attached to the bottom face of the electric connecting piece, and the static contact and the electric connecting piece are welded and fixed at the position of the inner flange through the welding technology. According to the utility model, the structure of the static contact and the electric connecting piece is changed, and a welding process with a more reliable fixing mode is adopted, so that loosening can be prevented, the assembly reliability can be ensured, the contact area can be increased, the contact resistance can be reduced, and cost reduction and efficiency improvement can be realized.

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 an electrical connector and a DC contactor with an electrical connector. Background Art

[0002] In the design and application of DC contactors, the fixed structure of the static contact and the copper bar 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 copper bar of the DC contactor.

[0003] At present, in DC contactors, the most common locking method for the static contact and the copper bar is to use screws to fix with the threaded holes on the static contact. For example, a relay device and a vehicle disclosed in a Chinese utility model patent with the publication number CN212648144U and the publication date of March 2, 2021, refer to paragraphs

[0007] to

[0012] of its specification and its appendix Figure 1 , which records the following content: "The relay contact 2 is fixedly connected to the copper bar or the bus bar 6 through the fixing member 7. Specifically, the fixing member 7 is a bolt." There are at least the following defects in the existing fixing method: 1) During the operation of the vehicle, due to long-term vibration or temperature change, the screws are prone to loosen, resulting in unstable connection and even causing electrical accidents; 2) The installation process of the copper bar and the static contact is relatively cumbersome and the efficiency is low; 3) The contact surface between the copper bar and the static contact is relatively small, only the end surface is in contact. 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 an electrical connector and a DC contactor with an electrical connector to overcome the defects of easy loosening, low assembly efficiency and small contact area of the existing fixed structure of the static contact and the electrical connector.

[0005] The technical solution adopted by the utility model to solve its technical problems is: a fixed structure of a static contact and an electrical connector, including:

[0006] A static contact, the top of the static contact is provided with an assembly boss protruding vertically upward, and the static contact is also provided with a stepped surface distributed around the assembly boss for one week;

[0007] And an electrical connector for connecting the static contact to an external load circuit. The electrical connector is provided with an assembly hole penetrating through its top surface and bottom surface. An annular inner flange with a thickness less than its hole depth is arranged in the assembly hole. The assembly boss is inserted into the assembly hole, and the stepped surface is completely attached to the bottom surface of the electrical connector. And the static contact and the electrical connector are welded and fixed at the inner flange by a welding process.

[0008] As a further improvement of the present utility model, the inner flange is located in the lower half of the assembly hole, and the bottom surface of the inner flange is flush with the bottom surface of the electrical connector, so that the assembly hole is in the shape of a stepped hole with a larger diameter in the upper section and a smaller diameter in the lower section.

[0009] As a further improvement of the present utility model, the welding process is a laser / electron beam penetration welding process, and the inner flange is penetrated by laser / electron beam to be melted and locally fused with the corresponding part of the step surface;

[0010] Or the welding process is a laser / electron beam seam welding process, and the joint between the assembly boss and the inner flange is welded by laser / electron beam.

[0011] As a further improvement of the present utility model, the inner flange and the assembly boss are assembled in an interference fit or clearance fit manner.

[0012] As a further improvement of the present utility model, the thickness of the inner flange is 1 mm to 3 mm.

[0013] As a further improvement of the present utility model, the number of the assembly bosses provided at the top of the static contact is one or more, and the number of the assembly holes opened in the electrical connector is the same as that of the assembly bosses and they correspond to each other one by one.

[0014] As a further improvement of the present utility model, the thickness of the assembly boss is not less than the thickness of the inner flange.

[0015] As a further improvement of the present utility model, the electrical connector is a copper bar or an aluminum bar, which is provided with a plate-shaped connection end, the assembly hole is arranged on the connection end, and the bottom surface of the connection end is used for fitting on the step surface.

[0016] As a further improvement of the present utility model, chamfers are provided along the edges at the top of the assembly boss and / or the bottom of the inner flange.

[0017] The present utility model also provides a DC contactor with an electrical connector, including: at least one pair of static contacts as described above and electrical connectors with the same number as the static contacts, and the static contacts and the electrical connectors are welded and fixed to each other one by one.

[0018] The beneficial effects of the present utility model are:

[0019] 1. The present utility model provides a fixed structure for a static contact and an electrical connector, and a DC contactor with an electrical connector. By eliminating the traditional threaded hole or threaded post structure on the static contact and instead designing it as an assembly boss, the assembly boss of the static contact is inserted into the assembly hole. The cooperation between the assembly boss and the assembly hole plays an assembly positioning role for installation. At the same time, a more reliable welding process is used for fixation, avoiding the problem that fasteners are prone to loosening during vehicle operation and reducing the risk of electrical accidents. In addition, since the threaded hole or threaded post structure on the static contact is eliminated, the structure of the static contact is simplified, the forming process is simpler, and the assembly efficiency of the static contact and the electrical connector is higher, achieving cost reduction and efficiency increase.

[0020] 2. The present utility model is provided with an inner flange in the assembly hole, and the thickness of the inner flange is less than the depth of the hole, and the welding position is on the inner flange. On the premise that the thickness of the electrical connector is certain, it can reduce the thickness of the welding part, so that a welding device with too high power is not required, and the welding time is short, enabling mass production and further improving production efficiency.

[0021] 3. With this fixed structure for the static contact and the electrical connector in the present utility model, the contact surface between the static contact and the electrical connector is not only the step surface of the static contact, but also the connection part between the inner flange and the assembly boss after welding fusion, thus increasing more contact area, reducing contact resistance, and avoiding excessive temperature rise. Description of the Drawings

[0022] Figure 1 is a three-dimensional view of the fixed structure of the static contact and the electrical connector of the present utility model;

[0023] Figure 2 is a cross-sectional view of the fixed structure of the static contact and the electrical connector of the present utility model;

[0024] Figure 3 is an exploded view of the fixed structure of the static contact and the electrical connector of the present utility model;

[0025] Figure 4 is a three-dimensional view of the DC contactor with an electrical connector of the present utility model after removing the electromagnetic mechanism;

[0026] Figure 5 is a cross-sectional view of the DC contactor with an electrical connector of the present utility model after removing the electromagnetic mechanism.

[0027] Combined with the drawings, the following description is made:

[0028] 1. Static contact; 101. Assembly boss; 102. Step surface; 103. Chamfer;

[0029] 2. Electrical connector; 201. Assembly hole; 202. Inner flange; 203. Connection end; 3. Ceramic cover; 4. Push rod assembly; 5. Moving contact piece. Detailed implementation manners

[0030] The following will, in conjunction with the accompanying drawings, give a detailed description of the preferred embodiments of the present utility model.

[0031] Refer to Figures 1 to 3 , the present utility model provides a fixed structure for a static contact and an electrical connector, including: a static contact 1 and an electrical connector 2 for connecting the static contact 1 to an external load circuit.

[0032] Among them, the top of the static contact 1 is provided with an assembly boss 101 protruding vertically upward, and the static contact 1 is further provided with a stepped surface 102 distributed around the assembly boss 101 for one week.

[0033] Specifically, the static contact 1 of this embodiment includes a cylindrical main body part. The assembly boss 101 is located at the middle position of the top of the main body part, and the size of the assembly boss 101 is smaller than that of the main body part. In other words, the assembly boss 101 can be regarded as integrally extending vertically upward from the middle part of the top of the main body part. The part of the top surface of the main body part except for being covered by the assembly boss 101 is the stepped surface 102.

[0034] Furthermore, the electrical connector 2 is provided with an assembly hole 201 penetrating through its top surface and bottom surface. The size of the assembly hole 201 is larger than that of the assembly boss 101. An annular inner flange 202 with a thickness less than its hole depth is provided in the assembly hole 201. The assembly boss 101 is inserted into the assembly hole 201, so that the stepped surface 102 is completely attached to the bottom surface of the electrical connector 2, and the static contact 1 and the electrical connector 2 are welded and fixed at the inner flange 202 by a welding process.

[0035] In this way, the present utility model cancels the traditional threaded hole or threaded post structure on the static contact 1 and designs it as an assembly boss 101. The assembly boss 101 of the static contact 1 is inserted into the assembly hole 201. The cooperation between the assembly boss 101 and the assembly hole 201 plays an assembly positioning role for installation. At the same time, a more reliable welding process is used for fixing, avoiding the problem that fasteners (screws or nuts) are prone to loosen during vehicle operation and reducing the risk of electrical accidents; in addition, since the threaded hole or threaded post structure on the static contact 1 is cancelled, 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 electrical connector 2 is higher, achieving cost reduction and efficiency increase.

[0036] It is worth mentioning that since the present utility model is provided with an inner flange 202 having a thickness less than its hole depth in the assembly hole 201, and the welding position is on the inner flange 202, on the premise that the thickness of the electrical connector 2 is constant, the thickness of the welding part can be reduced, so that a welding device with too high power is not required, and the welding time is short, enabling mass production and further improving production efficiency. In addition, with this fixed structure for the static contact 1 and the electrical connector 2, the contact surface between the static contact 1 and the electrical connector 2 is not only the step surface 102 of the static contact 1, but also the connection part between the inner flange 202 after welding fusion and the assembly boss 101, thereby increasing more contact area, reducing contact resistance, and avoiding excessive temperature rise.

[0037] In this embodiment, the welding process for the static contact 1 and the electrical connector 2 is a laser penetration welding process or an electron beam penetration welding process. The laser / electron beam penetrates the inner flange 202 from top to bottom to melt it and locally fuse it with the corresponding part of the step surface 102 to achieve welding fixation.

[0038] In other embodiments of the present utility model, the welding process for the static contact 1 and the electrical connector 2 can also adopt a laser seam welding process or an electron beam seam welding process, and the laser / electron beam is used to weld the joint between the assembly boss 101 and the inner flange 202.

[0039] Preferably, the thickness of the inner flange 202 is 1 mm to 3 mm, which can not only ensure penetration welding but also ensure welding strength.

[0040] Refer to Figure 2 , the inner flange 202 is located in the lower half of the assembly hole 201, and the bottom surface of the inner flange 202 is flush with the bottom surface of the electrical connector 2, so that the assembly hole 201 is in the shape of a stepped hole with a larger diameter in the upper section and a smaller diameter in the lower section. This configuration is more conducive to the accumulation of melted materials during welding and can be better fused together.

[0041] Among them, the cross-sectional shape of the assembly boss 101 is circular, semi-circular, polygonal, elliptical or irregularly shaped. In this embodiment, a circular shape is preferably selected, which is easy to process and assemble. Correspondingly, the shape of the assembly hole 201 matches the shape of the assembly boss 101, and a circular shape is also preferably selected.

[0042] In the present utility model, when the assembly boss 101 is inserted into the assembly hole 201, an interference fit or a clearance fit can be adopted between the inner flange 202 in the assembly hole 201 and the assembly boss 101. Among them, when the interference fit is adopted, during assembly, the electrical connector 2 can be pre-positioned, playing an axial limiting and fixing role, avoiding the deviation of the electrical connector 2 during welding, and ensuring the accuracy of the assembly of the electrical connector 2 and the static contact 1; while when the clearance fit is adopted, it is convenient to insert the assembly boss 101 into the assembly hole 201, which is easy to operate.

[0043] As Figure 1 shown, in this embodiment, the number of assembly bosses 101 provided at the top of the static contact 1 is one, and correspondingly, the number of assembly holes 201 opened in the electrical connector 2 is also one.

[0044] Of course, in other embodiments of the present utility model, the number of assembly bosses 101 provided at the top of the static contact 1 can also be two, three or even more, and correspondingly, the number of assembly holes 201 opened in the electrical connector 2 is the same and in one-to-one correspondence. By providing a plurality of assembly bosses 101 to cooperate with a plurality of assembly holes 201, the reliability of the assembly can be further improved.

[0045] Referring to Figure 3 , a chamfer 103 is provided along the edge at the top of the assembly boss 101, which is used to play a guiding role during the assembly of the electrical connector 2 and the static contact 1, facilitating the assembly.

[0046] Of course, a chamfer 103 can also be provided along the edge at the bottom of the inner flange 202, or alternatively, chamfers 103 can be provided along the edges at the top of the assembly boss 101 and the bottom of the inner flange 202 simultaneously, which can achieve the same above-mentioned effect.

[0047] Furthermore, the thickness of the assembly boss 101 is not less than the thickness of the inner flange 202 to ensure the welding strength. In this embodiment, the thickness of the assembly boss 101 is the same as the thickness of the electrical connector 2.

[0048] Among them, the electrical connector 2 is a copper row or an aluminum row with a certain thickness, which is provided with a plate-shaped connection end 203. The assembly hole 201 is provided on the connection end 203, and the bottom surface of the connection end 203 is used to fit against the step surface 102 to ensure sufficient contact area.

[0049] Referring to Figure 4 and Figure 5 , the present utility model also provides a DC contactor with an electrical connector, including: at least one pair of static contacts 1 as described above and electrical connectors 2 having the same number as the static contacts 1. The static contacts 1 and the electrical connectors 2 are welded and fixed in one-to-one correspondence by the above-mentioned fixing structure.

[0050] In addition, the DC contactor with an electrical connection member further includes a ceramic cover 3, a push rod assembly 4, a moving contact piece 5, and an electromagnetic mechanism, all of which are of the prior art.

[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 4 of this application's specification, two static contacts 1 are taken as an example for illustration in this text.

[0052] As Figure 5 shown, the two static contacts 1 are both fixed on the ceramic cover 3. Specifically, the diameter of the lower half of the main body part of the static contact 1 is smaller than that of the upper half. The lower half 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 half of the main body part is located at the top of the ceramic cover 3, and an annular welding part is vertically provided downward along the bottom edge of the upper half of the main body part. The static contact 1 relies on the welding part to be fixed to the ceramic cover 3 by brazing and achieve sealing.

[0053] Furthermore, the moving contact piece 5 is located inside the ceramic cover 3 and is mounted on the push rod assembly 4. The two ends of the moving contact piece 5 are arranged opposite to the two static contacts 1. The push rod assembly 4 is connected to the electromagnetic mechanism, and the electromagnetic mechanism is used to drive the moving contact piece 5 to move up and down through the push rod assembly 4 to make or break contact with the two static contacts 1.

[0054] It should be noted that this application does not limit the specific structures of the push rod assembly 4 and the electromagnetic mechanism. There are various implementation manners, and the structures of the push rod assembly and the electromagnetic mechanism disclosed in the Chinese utility model patent relay with the publication number CN221262241U and the publication date July 2, 2024 can be adopted.

[0055] It can be seen that in the fixed structure of the static contact and the electrical connector of the present utility model and the DC contactor with an electrical connector, by canceling the traditional threaded hole or threaded post structure on the static contact 1 and designing it as an assembly boss 101, the assembly boss 101 of the static contact 1 is inserted into the assembly hole 201. The cooperation between the assembly boss 101 and the assembly hole 201 plays an assembly positioning role for installation. At the same time, a more reliable welding process is used for fixation, avoiding the problem that fasteners (screws or nuts) are prone to loosen during vehicle operation and reducing the risk of electrical accidents. In addition, since the threaded hole or threaded post structure on the static contact 1 is canceled, 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 electrical connector 2 is higher, achieving cost reduction and efficiency improvement. Since the present utility model is provided with an inner flange 202 with a thickness less than its hole depth in the assembly hole 201 and the welding position is on the inner flange 202, on the premise that the thickness of the electrical connector 2 is certain, the thickness of the welding part can be reduced, so that a welding device with too high power is not required, and the welding time is short, enabling mass production and further improving production efficiency. In addition, with this fixed structure of the static contact 1 and the electrical connector 2, the contact surface between the static contact 1 and the electrical connector 2 is not only the step surface 102 of the static contact 1, but also the connection part between the inner flange 202 and the assembly boss 101 after welding fusion, thus increasing more contact area, reducing contact resistance, and avoiding excessive temperature rise.

[0056] Many specific details have been set forth in the above description to facilitate a full 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 implementations 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 contents that do not depart from 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 fixed structure between a static contact and an electrical connection component, characterized in that Comprising: A stationary contact (1), a vertically upwardly protruding assembly boss (101) is provided at the top of the stationary contact (1), and the stationary contact (1) is further provided with a stepped surface (102) distributed around the assembly boss (101) in a circumferential manner; And an electrical connector (2) for connecting the stationary contact (1) to an external load circuit. The electrical connector (2) is provided with an assembly hole (201) penetrating through its top surface and bottom surface. An annular inner flange (202) with a thickness less than its hole depth is provided in the assembly hole (201). The assembly boss (101) is inserted into the assembly hole (201), such that the stepped surface (102) is completely fitted to the bottom surface of the electrical connector (2), and the stationary contact (1) and the electrical connector (2) are welded and fixed at the inner flange (202) by a welding process.

2. The fixed structure of the static contact and the electrical connector according to claim 1, characterized in that: The inner flange (202) is located in the lower half of the assembly hole (201), and the bottom surface of the inner flange (202) is flush with the bottom surface of the electrical connector (2), so that the assembly hole (201) is in the shape of a stepped hole with a larger diameter in the upper section and a smaller diameter in the lower section.

3. The fixed structure of the static contact and the electrical connector according to claim 1, characterized in that: The welding process is a laser / electron beam penetration welding process, and the inner flange (202) is penetrated by laser / electron beam to be melted and locally fused with the corresponding part of the stepped surface (102); Or the welding process is a laser / electron beam seam welding process, and the joint between the assembly boss (101) and the inner flange (202) is welded by laser / electron beam.

4. The fixed structure of the static contact and the electrical connector according to claim 1, characterized in that: The inner flange (202) and the assembly boss (101) are assembled in an interference fit or clearance fit manner.

5. The fixed structure of the static contact and the electrical connector according to claim 1, characterized in that: The thickness of the inner flange (202) is 1 mm to 3 mm.

6. The fixed structure of the static contact and the electrical connector according to claim 1, characterized in that: The number of the assembly bosses (101) provided at the top of the stationary contact (1) is one or more, and the number of the assembly holes (201) provided in the electrical connector (2) is the same as that of the assembly bosses (101) and they are in one-to-one correspondence.

7. The fixed structure of the static contact and the electrical connection member according to claim 1, wherein: The thickness of the assembly boss (101) is not less than the thickness of the inner flange (202).

8. The fixed structure of the static contact and the electrical connection component according to claim 1, wherein: The electrical connector (2) is a copper bar or an aluminum bar, and it is provided with a plate-shaped connection end (203). The assembly hole (201) is provided on the connection end (203), and the bottom surface of the connection end (203) is used for fitting to the stepped surface (102).

9. The fixed structure of the static contact and the electrical connector according to claim 1, characterized in that: A chamfer (103) is provided along the edge at the top of the assembly boss (101) and / or the bottom of the inner flange (202).

10. A DC contactor with an electrical connector, characterized in that, Comprising: The stationary contact and electrical connector fixing structure according to any one of claims 1 to 9, wherein at least one pair of stationary contacts (1) are provided, and the number of the electrical connectors (2) is the same as that of the stationary contacts (1) and they are welded and fixed in one-to-one correspondence.

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