Sealing mechanism of automobile EV relay copper pipe

Abstract

The utility model discloses a sealing mechanism of an automobile EV relay copper pipe, which comprises a first pipe body, a first inner cavity is formed in the first pipe body, one end of the first pipe body is fixedly connected with a cover body, and a side wing at the other end of the first pipe body is connected with a pneumatic quick connector communicated with the first inner cavity. The cover body is provided with a copper pipe extending hole communicated with the first inner cavity. The first inner cavity is movably sleeved with the second pipe body, the second pipe body is provided with a second inner cavity, the end of the second pipe body is provided with a piston connected with the inner wall of the first inner cavity in a sealed mode, and the other end, away from the piston, of the second pipe body is provided with an extrusion part used for extruding the copper pipe; and the nitrogen charging pipe is connected to the second inner cavity in a sleeving manner. According to the utility model, the nitrogen charging operation of the relay can be realized while the copper pipe of the relay is sealed, the structure is simple, the installation is convenient, and the nitrogen charging device can be matched with different assembly line operations.

Description

Technical Field

[0001] The utility model relates to the technical field of automotive EV relays, and particularly relates to a sealing mechanism for a copper tube of an automotive EV relay. Background Art

[0002] An EV relay is a high-voltage DC relay, mainly used in the field of new energy vehicles, especially in electric vehicles (EVs) and charging facilities. It consists of multiple components, including a movable contact, a fixed contact, a container box, a main terminal, a sealed contact area, a mixed gas, a permanent magnet, and a body, etc.

[0003] During the production process of the relay, nitrogen filling usually occurs in the last stage of encapsulating the relay. That is, before the relay housing is closed, the copper tube is hermetically sealed, and then nitrogen filling operation is carried out to ensure an optimized internal environment. At present, the sealing and nitrogen filling need to be carried out separately, and the process is troublesome, resulting in too high equipment costs and unable to meet the production requirements of enterprises. Therefore, it is necessary to study a mechanism with a simple structure that can simultaneously meet the hermetic sealing of the copper tube and nitrogen filling to meet different requirements. Summary of the Utility Model

[0004] The purpose of the utility model is to overcome the above-mentioned defects in the prior art, and provide a sealing mechanism for a copper tube of an automotive EV relay, which can realize the hermetic sealing of the relay copper tube and the nitrogen filling operation of the relay at the same time, has a simple structure, is convenient to install, and can cooperate with different assembly lines.

[0005] To achieve the above purpose, the utility model provides a sealing mechanism for a copper tube of an automotive EV relay, including:

[0006] A first tube body, the first tube body is a hollow cylindrical structure, a first inner cavity is formed inside the first tube body, one end of the first tube body is fixedly connected with a cover body, the other end of the first tube body is flanked by a pneumatic quick connector communicated with the first inner cavity, and a copper tube insertion hole communicated with the first inner cavity is arranged on the cover body;

[0007] A second tube body movably sleeved in the first inner cavity, the second tube body is provided with a second inner cavity, a piston hermetically connected to the inner wall of the first inner cavity is arranged at the end of the second tube body, an extrusion part for extruding the copper tube is arranged at the other end of the second tube body far from the piston, and the extrusion part is arranged opposite to the copper tube insertion hole;

[0008] A nitrogen filling tube sleeved in the second inner cavity, one end of the nitrogen filling tube is communicated with the extrusion part, and the other end of the nitrogen filling tube is hermetically connected to the first tube body and the second tube body respectively.

[0009] Further, the extrusion part is a cavity formed by the inner concave of one end of the second pipe body adjacent to the cover body. The extrusion part and the inner wall of the first cavity form an extrusion step, and a sealing ring group for sealing the copper pipe is arranged on the extrusion step. By setting the extrusion step and cooperating with the sealing ring group, the inserted copper pipe can be extruded and deformed for sealing.

[0010] Further, the sealing ring group includes a first sealing ring, a gasket, and a second sealing ring stacked in sequence. In this way, the copper pipe can be sealed in cooperation with the second pipe body.

[0011] Further, the copper pipe insertion hole is provided with a guiding part and a flat part with a tapered cross-sectional structure. The inner diameter of the flat part is slightly larger than that of the copper pipe. The guiding part can facilitate the insertion of the copper pipe, and the size of the inner diameter can limit the position of the copper pipe, avoiding the occurrence of left-right shaking of the copper pipe during sealing.

[0012] Further, a first through hole is provided on the first pipe body. The pneumatic quick connector is communicated with the first inner cavity through the first through hole. The other end of the first pipe body away from the first through hole is provided with a second through hole communicated with the first inner cavity. The first through hole and the second through hole are respectively located on both sides of the piston.

[0013] Further, a first groove and a second groove are provided on the outer edge of the piston. A third sealing ring and a fourth sealing ring are provided on the first groove and the second groove. Both the third sealing ring and the fourth sealing ring are in close contact with the inner wall of the first inner cavity. In this way, the sealing performance between the piston and the first inner cavity can be increased, and the accuracy of its movement can be improved.

[0014] Further, a third groove is provided on the inner wall of the second inner cavity. A fifth sealing ring is provided on the third groove. The fifth sealing ring is in close contact with the outer wall of the nitrogen filling pipe. Thereby, the sealing performance between the second inner cavity and the nitrogen filling pipe is increased, and gas leakage can be avoided from affecting the normal nitrogen filling operation.

[0015] Further, a gas release groove is provided on the nitrogen filling pipe.

[0016] Further, the other end of the first pipe body relative to the cover body is provided with a first installation groove. The nitrogen filling pipe is provided with an installation part matching the first installation groove. The installation part is fixedly connected in the first installation groove. It is used for installing the nitrogen filling pipe, with a simple structure and convenient installation.

[0017] Further, a fourth groove is provided on the installation part. A sixth sealing ring is provided on the fourth groove. The airtightness of the nitrogen filling pipe is increased to ensure the quality of nitrogen filling.

[0018] Compared with the prior art, the utility model has the following advantages: The cooperation between the first tube body and the second tube body of the utility model enables the piston to drive the second tube body to perform up and down operations in the first inner cavity. The extrusion part arranged at the end of the second tube body can extrude and seal the inserted copper tube, ensuring complete sealing inside the copper tube, and no air or other impurities can enter. Subsequently, by filling nitrogen, an inert environment inside the relay is maintained, avoiding the influence of oxidation and moisture, thereby ensuring the electrical performance and long-term stability of the relay. In this way, the sealing of the copper tube and the nitrogen filling operation of the relay can be achieved simultaneously, effectively improving production efficiency and saving costs. The structure of the utility model is simple, the installation is quick, and the operation is convenient, and it can be adapted to various production equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0020] Figure 1 It is a schematic structural diagram of a sealing mechanism for a copper tube of an automotive EV relay of the present utility model;

[0021] Figure 2 is Figure 1 a sectional view taken along line A-A of

[0022] Figure 3 is Figure 1 an exploded structural diagram of

[0023] Figure 4 It is a schematic structural diagram of the second tube body of the present utility model;

[0024] In the figure, it includes:

[0025] 1. First tube body; 11. First inner cavity; 12. First through hole; 13. Second through hole; 14. First installation groove; 2. Second tube body; 21. Piston; 211. First groove; 212. Second groove; 213. Third sealing ring; 214. Fourth sealing ring; 22. Extrusion part; 221. Extrusion step; 23. Second inner cavity; 231. Third groove; 232. Fifth sealing ring; 3. Nitrogen filling tube; 31. Installation part; 311. Fourth groove; 312. Sixth sealing ring; 32. Air leakage groove; 33. Third inner cavity; 4. Cover body; 41. Fifth groove; 42. Seventh sealing ring; 43. Copper tube insertion hole; 431. Guide part; 432. Flattened part; 5. Pneumatic quick connector; 6. Sealing ring group; 61. First sealing ring; 62. Gasket; 63. Second sealing ring. Specific Embodiments

[0026] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are one embodiment of the present utility model, rather than all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present utility model.

[0027] It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present utility model are only used to explain the relative positional relationship and movement conditions between components in a specific posture (as described in the accompanying drawings). If the specific posture changes, the directional indications will also change accordingly.

[0028] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present utility model, such descriptions of "first", "second", etc. are only for descriptive purposes and should not be construed as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features.

[0029] Please refer to Figures 1 to 4, an embodiment of the present utility model provides a sealing mechanism for an automotive EV relay copper tube, including: a first tube body 1, a second tube body 2, and a nitrogen filling tube 3. In this embodiment, the first tube body 1, the second tube body 2, and the nitrogen filling tube 3 are all hollow cylindrical structures. A first inner cavity 11 is formed inside the first tube body 1. One end of the first tube body 1 is fixedly connected with a cover body 4. The cover body 4 can be detachably connected to the first tube body 1 through screw threads or other means. Of course, in order to ensure its sealing degree, a fifth groove 41 is provided on the cover body 4, and a seventh sealing ring 42 is installed on the fifth groove 41. During assembly, the seventh sealing ring 42 can closely abut against the inner wall of the first tube body 1 to ensure the sealing performance of the connection between the cover body 4 and the first tube body 1; The other end flank of the first tube body 1 is connected with a pneumatic quick connector 5 communicated with the first inner cavity 11. Through this pneumatic quick connector 5, an external air source can be connected to provide a power source for the movement of the piston 21. A copper tube insertion hole 43 communicated with the first inner cavity 11 is provided on the cover body 4. The copper tube insertion hole 43 is provided with a guiding portion 431 with a tapered cross-section and a flat portion 432. The inner diameter of the flat portion 432 is slightly larger than that of the copper tube; The guiding portion 431 is provided to facilitate the insertion of the copper tube, and the flat portion 432 can limit the position of the copper tube, avoiding the occurrence of left and right shaking of the copper tube during sealing; In this embodiment, the second tube body 2 is movably sleeved in the first inner cavity 11. A piston 21 for sealing connection with the inner wall of the first inner cavity 11 is provided at the end of the second tube body 2. Specifically, a first groove 211 and a second groove 212 are provided on the outer edge of the piston 21. A third sealing ring 213 and a fourth sealing ring 214 are provided on the first groove 211 and the second groove 212. Both the third sealing ring 213 and the fourth sealing ring 214 are closely abutted against the inner wall of the first inner cavity 11. The other end of the second tube body 2 away from the piston 21 is provided with an extrusion portion 22 for extruding the copper tube. The extrusion portion (22) is arranged opposite to the copper tube insertion hole (43). The extrusion portion 22 is a cavity formed by the inner concave of the end of the second tube body 2 adjacent to the cover body 4. An extrusion step 221 is formed between the extrusion portion 22 and the inner wall of the first cavity. A sealing ring group 6 for sealing the copper tube is provided on the extrusion step 221. The sealing ring group 6 includes a first sealing ring 61, a gasket 62, and a second sealing ring 63 stacked in sequence. The second tube body 2 is provided with a second inner cavity 23;

[0030] To ensure that the piston 21 can drive the normal displacement of the second tube body 2, a first through hole 12 is provided on the first tube body 1. The pneumatic quick connector 5 is communicated with the first inner cavity 11 through the first through hole 12. The other end of the first tube body 1 away from the first through hole 12 is provided with a second through hole 13 communicated with the first inner cavity 11. The first through hole 12 and the second through hole 13 are respectively located on both sides of the piston 21. The second through hole 13 is used for the exhaust cooperation of the movement of the piston 21;

[0031] The nitrogen filling pipe 3 is sleeved in the second inner cavity 23. One end of the nitrogen filling pipe 3 is communicated with the extrusion part 22, and the other end of the nitrogen filling pipe 3 is hermetically connected to the first pipe body 1 and the second pipe body 2 respectively. Specifically, a first installation groove 14 is provided at the other end of the first pipe body 1 relative to the cover body 4. An installation part 31 matching the first installation groove 14 is provided on the nitrogen filling pipe 3. The installation part 31 is fixedly connected in the first installation groove 14. A fourth groove 311 is provided on the installation part 31, and a sixth sealing ring 312 is provided on the fourth groove 311. The sixth sealing ring 312 is in close contact with the inner wall of the above-mentioned first installation groove 14. A third groove 231 is provided on the inner wall of the second inner cavity 23, and a fifth sealing ring 232 is provided on the third groove 231. The fifth sealing ring 232 is in close contact with the outer wall of the nitrogen filling pipe 3, thereby increasing the sealing performance between the second inner cavity 23 and the nitrogen filling pipe 3 and avoiding gas leakage from affecting the normal nitrogen filling operation. A deflation groove 32 is provided on the nitrogen filling pipe 3 to cooperate with the deflation of the second cylinder through the deflation groove 32. To realize the filling of nitrogen, the nitrogen filling pipe 3 of this embodiment is provided with a third inner cavity 33 penetrating through the nitrogen filling pipe 3. One end of the third inner cavity 33 can be connected to an external nitrogen filling device, and the other end of the third inner cavity 33 is just placed on the extrusion part 22.

[0032] Brief description of the working principle of the present invention: Before working, an external air source is connected through the pneumatic quick connector 5, and the end of the nitrogen filling pipe 3 is externally connected to a nitrogen filling device. After completion, the operation can be carried out. First, insert the copper pipe of the relay into the copper pipe insertion hole 43. Then, the pneumatic air source causes the piston 21 to move upward under the action of air pressure, driving the second pipe body 2 upward. Under the cooperation of the cover body 4 and the extrusion part 22, the sealing ring group 6 installed on the extrusion part 22 will be extruded, and at the same time, the sealing ring group 6 will also act on the interface of the copper pipe with the same force to cause extrusion deformation and thus achieve sealing. After completion, the externally connected nitrogen filling device is actuated, and nitrogen enters the relay copper pipe from the nitrogen filling pipe 3, and then the pressure is relieved and reset.

[0033] The above is only the preferred embodiment of the present invention and is not used to limit the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A sealing mechanism for a copper tube of an automobile EV relay, characterized in that: include: A first tube body (1), the first tube body (1) is a hollow cylindrical structure, a first inner cavity (11) is formed inside the first tube body (1), one end of the first tube body (1) is fixedly connected to a cover body (4), the other end of the first tube body (1) is flanked by a pneumatic quick connector (5) connected to the first inner cavity (11), and the cover body (4) is provided with a copper tube insertion hole (43) connected to the first inner cavity (11); A second tube body (2) movably sleeved on the first inner cavity (11), the second tube body (2) being provided with a second inner cavity (23), the end of the second tube body (2) being provided with a piston (21) sealedly connected to the inner wall of the first inner cavity (11), the other end of the second tube body (2) away from the piston (21) being provided with an extrusion portion (22) for extruding the copper tube, the extrusion portion (22) being arranged facing the copper tube insertion hole (43); A nitrogen filling tube (3) is sleeved on the second inner cavity (23), one end of the nitrogen filling tube (3) is connected to the extrusion portion (22), and the other end of the nitrogen filling tube (3) is respectively sealed and connected to the first tube body (1) and the second tube body (2).

2. The sealing mechanism of the copper tube of the automobile EV relay according to claim 1, characterized in that: The extrusion portion (22) is a cavity formed by an inward concave portion at one end of the second tube body (2) adjacent to the cover body (4); the extrusion portion (22) and the inner wall of the first cavity form an extrusion step (221); and a sealing ring group (6) for sealing the copper tube is provided on the extrusion step (221).

3. The sealing mechanism of the copper tube of the automobile EV relay according to claim 2, characterized in that: The sealing ring set (6) comprises a first sealing ring (61), a gasket (62) and a second sealing ring (63) which are stacked in sequence.

4. The sealing mechanism of the copper tube of the automobile EV relay according to claim 1, characterized in that: The copper tube insertion hole (43) is provided with a guide portion (431) having a conical cross-section and a flattened portion (432), and the inner diameter of the flattened portion (432) is slightly larger than that of the copper tube.

5. The sealing mechanism of the copper tube of the automobile EV relay according to claim 1, characterized in that: The first tube body (1) is provided with a first through hole (12), the pneumatic quick connector (5) is connected to the first inner cavity (11) through the first through hole (12), the other end of the first tube body (1) away from the first through hole (12) is provided with a second through hole (13) connected to the first inner cavity (11), and the first through hole (12) and the second through hole (13) are respectively arranged on both sides of the piston (21).

6. The sealing mechanism of the copper tube of the automobile EV relay according to claim 1, characterized in that: The outer edge of the piston (21) is provided with a first groove (211) and a second groove (212); a third sealing ring (213) and a fourth sealing ring (214) are provided on the first groove (211) and the second groove (212); the third sealing ring (213) and the fourth sealing ring (214) are both in tight contact with the inner wall of the first inner cavity (11).

7. The sealing mechanism of the copper tube of the automobile EV relay according to claim 6, characterized in that: The inner wall of the second inner cavity (23) is provided with a third groove (231), and a fifth sealing ring (232) is provided on the third groove (231), and the fifth sealing ring (232) is in tight contact with the outer wall of the nitrogen filling tube (3).

8. The sealing mechanism of the copper tube of the automobile EV relay according to claim 1, characterized in that: The nitrogen filling pipe (3) is provided with a gas release groove (32).

9. The sealing mechanism of the copper tube of the automobile EV relay according to claim 1, characterized in that: The other end of the first tube body (1) relative to the cover body (4) is provided with a first mounting groove (14), and the nitrogen filling tube (3) is provided with a mounting portion (31) matching the first mounting groove (14), and the mounting portion (31) is fixedly connected in the first mounting groove (14).

10. The sealing mechanism of the copper tube of the automobile EV relay according to claim 9, characterized in that: The mounting portion (31) is provided with a fourth groove (311), and the fourth groove (311) is provided with a sixth sealing ring (312).

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