Fixing structure for static contact and electric connecting piece of contactor

Abstract

The utility model discloses a fixing structure for a static contact and an electric connecting piece of a contactor, which comprises the static contact and the electric connecting piece, a positioning boss is arranged at the top of the static contact, and the static contact extends outwards around the bottom of the positioning boss by a circle to form a bearing step. The electric connecting piece is arranged on the positioning boss in a sleeving manner and is supported on the bearing step, and the bottom surface of the electric connecting piece is attached to the top surface of the bearing step; wherein the static contact is fixedly connected with the electric connecting piece in a welding manner. According to the utility model, the positioning boss is arranged on the static contact, and the electric connecting piece is sleeved on the positioning boss and is fixed by adopting a more reliable welding process in a fixing mode, so that loosening can be prevented, the assembly is easy, the contact area is increased, the contact resistance is reduced, the contact reliability is ensured, and cost reduction and efficiency improvement are realized.

Description

Technical Field

[0001] The utility model relates to the technical field of contactors, in particular to a fixing structure of a static contact and an electric connector of a contactor. Background Art

[0002] With the rapid development of new energy electric vehicles, the market demand for the rated voltage and rated current of DC contactors is getting higher and higher, and at the same time, the requirement for the connection reliability between the static contacts of the contactors and the electrical connectors (such as copper busbars) is getting higher and higher.

[0003] At present, in the existing DC contactor, the static contact is usually provided with a threaded hole or a stud for locking with the electrical connector; at the same time, the most common locking method is to fix it with a screw and the threaded hole of the static contact or with a nut and the stud of the static contact. Since new energy electric vehicles are subject to long-term vibration and temperature changes during driving, the screws or nuts are prone to loosening, resulting in an unstable connection between the static contact and the electrical connector of the contactor, and even causing electrical accidents. In addition, with the existing locking method, the installation process of the electrical connector and the static contact is relatively cumbersome, the installation efficiency is low, and the electrical connector only contacts the end face of the static contact, the contact area between the two is relatively small, and the contact resistance is high. Therefore, it is necessary to improve the existing technology to overcome the defects in the existing technology. Utility Model Content

[0004] The problem to be solved by the utility model is to provide a fixing structure of a contactor static contact and an electrical connector, so as to overcome the defects of the existing contactor static contact and the electrical connector being easy to be loosened during installation, having a small contact area and having a low installation efficiency.

[0005] The utility model adopts a technical solution to solve its technical problems: a fixing structure of a contactor static contact and an electrical connector, comprising: a static contact and an electrical connector, wherein a positioning boss is provided on the top of the static contact, the static contact extends outward around the bottom of the positioning boss to form a bearing step, the electrical connector is sleeved on the positioning boss and supported on the bearing step, and the bottom surface of the electrical connector is fitted to the top surface of the bearing step; wherein the static contact and the electrical connector are fixedly connected by welding.

[0006] As a further improvement of the utility model, the electrical connector is provided with a through hole, the positioning boss is inserted into the through hole, and the welding position of the static contact and the electrical connector is between the inner peripheral wall of the through hole and the outer peripheral wall of the positioning boss.

[0007] As a further improvement of the present invention, the positioning boss is transitionally fitted into the through hole of the electrical connector.

[0008] As a further improvement of the utility model, the size of the through hole gradually increases from top to bottom, and the size of the upper end of the through hole is smaller than the size of the positioning boss to form an interference fit between the upper end of the through hole and the positioning boss, and the size of the lower end of the through hole is larger than the size of the positioning boss to form a gap between the lower end of the through hole and the positioning boss.

[0009] As a further improvement of the utility model, the static contact and the electrical connector are welded by electron beam welding, laser welding, or resistance welding.

[0010] As a further improvement of the utility model, the static contact is provided with a cylindrical main body, the positioning boss is formed by the main body extending upward along the middle part of its top, and the top of the main body except the part covered by the positioning boss is the bearing step.

[0011] As a further improvement of the utility model, the static contact is provided with a cylindrical main body, the bearing step is formed by a flange edge provided in the middle of the outer peripheral wall of the main body, and the portion of the main body higher than the bearing step is the positioning boss.

[0012] As a further improvement of the present invention, the upper edge of the positioning boss is provided with a chamfer.

[0013] As a further improvement of the present invention, the thickness of the positioning boss is not less than the thickness of the electrical connector.

[0014] As a further improvement of the present invention, the cross section of the positioning boss is circular, semicircular, elliptical, polygonal or irregularly shaped.

[0015] The beneficial effects of the utility model are as follows: the utility model provides a fixing structure of a contactor static contact and an electrical connector, by providing a positioning boss on the static contact, the electrical connector is mounted on the positioning boss and fixed by a more reliable welding process, abandoning the traditional installation method by screws or nuts, avoiding the problem of easy loosening during vehicle operation, reducing the risk of electrical accidents, and also reducing the complex parts molding process, optimizing the fixing and installation process of the electrical connector and the static contact, which can easily realize automated assembly and achieve cost reduction and efficiency improvement; in addition, the use of the fixing structure of the utility model can also make the contact surface between the electrical connector and the static contact not only on the top surface of the load-bearing step, but also on the contact part between the positioning boss and the electrical connector, thereby increasing more contact area, reducing contact resistance, ensuring contact reliability, and avoiding excessive temperature rise. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1It is a three-dimensional diagram of the first embodiment of the fixing structure of the static contact and the electrical connector of the contactor of the utility model;

[0017] Figure 2 It is a cross-sectional view of the first embodiment of the fixing structure of the static contact and the electrical connector of the contactor of the utility model;

[0018] Figure 3 The utility model is a fixing structure for the static contact of the contactor and the electrical connector Figure 2 A magnified view of middle;

[0019] Figure 4 A three-dimensional diagram of a stationary contact of a contactor according to a first embodiment of the fixing structure of the stationary contact and the electrical connector of the utility model;

[0020] Figure 5 It is a three-dimensional diagram of the second embodiment of the fixing structure of the static contact and the electrical connector of the contactor of the utility model;

[0021] Figure 6 It is a cross-sectional view of the second embodiment of the fixing structure of the static contact and the electrical connector of the contactor of the utility model;

[0022] Figure 7 It is a stereoscopic view of the static contact of the second embodiment of the fixing structure of the static contact and the electrical connector of the contactor of the utility model.

[0023] Combined with the attached drawings, the following description is given:

[0024] 1. static contact; 11. main body; 101. positioning boss; 102. bearing step; 1011. chamfer; 2. electrical connector; 201. through hole; 3. ceramic cover. DETAILED DESCRIPTION

[0025] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings.

[0026] Embodiment 1

[0027] See also Figures 1 to 4 The utility model provides a fixing structure of a static contact and an electrical connector of a contactor, comprising: a static contact 1 and an electrical connector 2, wherein the static contact 1 is fixed on a ceramic cover 3 of the contactor, and the lower end of the static contact 1 extends toward the inside of the ceramic cover 3, and is used to connect or disconnect with a moving contact piece of the contactor; the upper end of the static contact 1 extends upward outside the ceramic cover 3, and is used to be fixedly connected with the electrical connector 2 to be connected to a load circuit.

[0028] It should be noted that the number of static contacts 1 on the ceramic cover 3 may be two, four, etc. depending on the requirements of different types of DC contactor products, so the present application does not impose any restrictions on this. As shown in the drawings of the present application specification, this article takes two static contacts 1 as an example for explanation.

[0029] See also Figure 2 and Figure 3 A positioning boss 101 is provided on the top of the static contact 1, and the static contact 1 extends outward around the bottom of the positioning boss 101 to form a bearing step 102. The electrical connector 2 is mounted on the positioning boss 101 and supported on the bearing step 102, so that the bottom surface of the electrical connector 2 is in contact with the top surface of the bearing step 102.

[0030] The stationary contact 1 and the electrical connector 2 are fixedly connected by welding.

[0031] Consistent with the traditional static contact, the static contact 1 of this embodiment is provided with a cylindrical main body 11, and the upper and lower parts of the main body 11 have different diameters. Specifically, the diameter of the lower part of the main body 11 is smaller than the diameter of the upper part; the lower part of the main body 11 is inserted into the mounting hole of the ceramic cover 3, and the upper part of the main body 11 is at the top of the ceramic cover 3; and the upper part of the main body 11 is provided with an annular welding part vertically downward along the bottom edge, and the static contact 1 relies on the welding part to be brazed and fixed to the ceramic cover 3 to achieve sealing.

[0032] In this embodiment, the positioning boss 101 can be regarded as an integral extension upward from the middle portion of the top of the main body 11 , and the top portion of the main body 11 other than that covered by the positioning boss 101 can be regarded as a bearing step 102 .

[0033] In this way, the utility model eliminates the threaded hole or screw structure design of the traditional static contact, and instead designs a positioning boss 101 at the original threaded hole or screw position, sets the electrical connector 2 on the positioning boss 101 and fixes it with a more reliable welding process, abandoning the traditional installation method of screws or nuts, avoiding the problem of easy loosening during vehicle operation, reducing the risk of electrical accidents, and also reducing the complex parts molding process, optimizing the fixed installation process of the electrical connector 2 and the static contact 1, and achieving cost reduction and efficiency improvement. In addition, by adopting the fixed structure of the utility model, the contact surface between the electrical connector 2 and the static contact 1 is not only on the end face of the static contact 1 (i.e., the top surface of the bearing step 102), but also on the contact part between the positioning boss 101 and the electrical connector 2, thereby increasing more contact area, reducing contact resistance, ensuring contact reliability, and avoiding excessive temperature rise.

[0034] See also Figure 2 The electrical connector 2 is provided with a through hole 201 , the positioning boss 101 is inserted into the through hole 201 , and the welding position of the static contact 1 and the electrical connector 2 is between the inner peripheral wall of the through hole 201 and the outer peripheral wall of the positioning boss 101 .

[0035] The cross section of the positioning boss 101 can be circular, semicircular, elliptical, polygonal or irregular, and the present embodiment is preferably circular, which is easy to process and assemble. Accordingly, the shape of the through hole 201 matches the shape of the positioning boss 101, and is also preferably circular.

[0036] The positioning boss 101 is transitionally fitted in the through hole 201 of the electrical connector 2. Preferably, the positioning boss 101 is interference-fitted in the through hole 201 of the electrical connector 2. This interference-fitting method can play an axial limiting and fixing role on the electrical connector 2, avoid the electrical connector 2 from being offset during welding, and ensure the reliability of the assembly of the electrical connector 2 and the static contact 1.

[0037] As a preferred example, Figure 3 As shown, the diameter of the through hole 201 gradually increases from top to bottom, and the diameter of the upper end of the through hole 201 is smaller than the diameter of the positioning boss 101, so that an interference fit can be formed between the upper end of the through hole 201 and the positioning boss 101; the diameter of the lower end of the through hole 201 is larger than the diameter of the positioning boss 101, so that a small gap can be formed between the lower end of the through hole 201 and the positioning boss 101, which plays a guiding role when assembling the electrical connector 2 and the static contact 1 to avoid interference during assembly.

[0038] Optionally, the welding method between the static contact 1 and the electrical connector 2 is any one of electron beam welding, laser welding, and resistance welding. Laser welding is recommended. The welding point can directly reach the bottom of the connection between the electrical connector 2 and the static contact 1, so that the inner wall of the through hole 201 and the outer wall of the positioning boss 101 are completely welded together, making the fixation more reliable and ensuring the contact area.

[0039] Among them, the upper edge of the positioning boss 101 is provided with a chamfer 1011, which can be a right angle or a rounded angle. On the one hand, it can play a guiding role when assembling the electrical connector 2 and the static contact 1, and on the other hand, it can facilitate the melting, flow and accumulation of materials during welding, thereby improving the welding strength.

[0040] Preferably, the thickness of the positioning boss 101 is not less than the thickness of the electrical connector 2 to ensure that there is a sufficiently large contact area between the positioning boss 101 and the electrical connector 2 to reduce contact resistance.

[0041] In the present invention, the electrical connector 2 may be, but is not limited to, a copper bar or an aluminum bar with a certain thickness.

[0042] The assembly steps of the utility model are as follows:

[0043] First, the electrical connector 2 is mounted on the positioning boss 101 of the stationary contact 1 to be fixed by a slight interference fit between the two, and then the electrical connector 2 and the stationary contact 1 are welded and fixed at the connection by a laser welding process.

[0044] Embodiment 2

[0045] See also Figures 5 to 7 The difference between this embodiment and the first embodiment is that the structure of the stationary contact 1 is different.

[0046] Specifically, the stationary contact 1 is provided with a cylindrical main body 11, a circular flange is provided in the middle of the outer peripheral wall of the upper half of the main body 11, the bearing step 102 is formed by the flange provided in the middle of the outer peripheral wall of the main body 11, and the part of the main body 11 higher than the bearing step 102 can be regarded as the positioning boss 101. Accordingly, the through hole 201 of the electrical connector 2 needs to be enlarged to match the positioning boss 101.

[0047] Compared with the first embodiment, the diameter of the positioning boss 101 in this embodiment is larger, that is, the outer diameter of the welding part is larger, and the contact area can be further increased by increasing the thickness of the electrical connector 2 and the height of the static contact 1 to further reduce the contact resistance.

[0048] In summary, the fixing structure of the static contact and the electrical connector of the contactor of the utility model is provided with a positioning boss 101 on the static contact 1, and the electrical connector 2 is mounted on the positioning boss 101 and fixed by a more reliable welding process, thereby abandoning the traditional installation method by screws or nuts, avoiding the problem of easy loosening during vehicle operation, reducing the risk of electrical accidents, and also reducing the complex parts molding process, optimizing the fixing and installation process of the electrical connector 2 and the static contact 1, and can easily realize automated assembly, thereby achieving cost reduction and efficiency improvement. In addition, the use of the fixed structure of the utility model can make the contact surface between the electrical connector 2 and the static contact 1 not only on the top surface of the bearing step 102, but also on the contact part between the positioning boss 101 and the electrical connector 2, thereby increasing more contact area, reducing contact resistance, ensuring contact reliability, and avoiding excessive temperature rise.

[0049] In the above description, many specific details are described to facilitate a full understanding of the present invention. However, the above description is only a preferred embodiment of the present invention. The present invention can be implemented in many other ways different from those described herein, so the present invention is not limited by the specific implementation disclosed above. At the same time, any person familiar with the technical field can make many possible changes and modifications to the technical solution of the present invention by using the methods and technical contents disclosed above without departing from the scope of the technical solution of the present invention, or modify it into an equivalent embodiment of equivalent changes. Any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the scope of protection of the technical solution of the present invention.

Claims

1. A fixing structure for a contactor static contact and an electrical connector, comprising a static contact (1) and an electrical connector (2), characterized in that: A positioning boss (101) is provided on the top of the stationary contact (1); the stationary contact (1) extends outward around the bottom of the positioning boss (101) to form a bearing step (102); the electrical connector (2) is sleeved on the positioning boss (101) and supported on the bearing step (102), and the bottom surface of the electrical connector (2) is in contact with the top surface of the bearing step (102); wherein the stationary contact (1) and the electrical connector (2) are fixedly connected by welding.

2. The fixing structure of the contactor static contact and the electrical connector according to claim 1, characterized in that: The electrical connector (2) is provided with a through hole (201), the positioning boss (101) is inserted into the through hole (201), and the welding position of the static contact (1) and the electrical connector (2) is between the inner peripheral wall of the through hole (201) and the outer peripheral wall of the positioning boss (101).

3. The fixing structure of the contactor static contact and the electrical connector according to claim 2, characterized in that: The positioning boss (101) is transitionally fitted into the through hole (201) of the electrical connector (2).

4. The fixing structure of the contactor static contact and the electrical connector according to claim 3, characterized in that: The size of the through hole (201) gradually increases from top to bottom, and the size of the upper end of the through hole (201) is smaller than the size of the positioning boss (101), so as to form an interference fit between the upper end of the through hole (201) and the positioning boss (101), and the size of the lower end of the through hole (201) is larger than the size of the positioning boss (101), so as to form a gap between the lower end of the through hole (201) and the positioning boss (101).

5. The fixing structure of the contactor static contact and the electrical connector according to claim 1, characterized in that: The welding method of the stationary contact (1) and the electrical connector (2) is any one of electron beam welding, laser welding and resistance welding.

6. The fixing structure of the contactor static contact and the electrical connector according to claim 1, characterized in that: The stationary contact (1) is provided with a columnar main body (11), the positioning boss (101) is formed by the main body (11) extending upwards in one piece along the middle part of the top thereof, and the top of the main body (11) except the part covered by the positioning boss (101) is the bearing step (102).

7. The fixing structure of the contactor static contact and the electrical connector according to claim 1, characterized in that: The stationary contact (1) is provided with a columnar main body (11), the bearing step (102) is formed by a flange edge provided in the middle of the outer peripheral wall of the main body (11), and the portion of the main body (11) that is higher than the bearing step (102) is the positioning boss (101).

8. The fixing structure of the contactor static contact and the electrical connector according to claim 1, characterized in that: The upper edge of the positioning boss (101) is provided with a chamfer (1011).

9. The fixing structure of the contactor static contact and the electrical connector according to claim 1, characterized in that: The thickness of the positioning boss (101) is not less than the thickness of the electrical connector (2).

10. The fixing structure of the contactor static contact and the electrical connector according to claim 1, characterized in that: The cross section of the positioning boss (101) is circular, semicircular, elliptical or polygonal.

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