Ceramic high-voltage direct-current contactor with air supply function
By setting up metal tubes and gas replenishment structures in ceramic high-pressure DC contactors, the problem of reducing arc extinguishing capacity after protection gas leakage is solved, and repeated gas replenishment and extended contactor life are achieved.
Patent Information
- Application Number
- CN202510153605.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-12
- Publication Date
- 2025-04-29
AI Technical Summary
After the protection gas leaks, existing ceramic high-pressure DC contactors lead to a reduction in arc extinguishing capacity, affecting performance and life. After determining that the air leakage, they can only replace the new contactor, causing cost loss.
A ceramic high-pressure DC contactor with gas replenishment function was designed. By setting up a metal tube to observe the air pressure in the sealing cavity, and adopt a gas replenishment structure, including the cooperation of the sealing sleeve and push rod and spring, to achieve repeated replenishment of the protective gas.
Gas leakage can be judged without disassembling the contactor and improved working efficiency; repeated gas replenishment will extend the service life of the contactor and reduce the cumbersome process of replacing the contactor.
Smart Images
Figure CN119905370A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of direct current contactors, in particular to a ceramic high-voltage direct current contactor with an air replenishing function. Background Art
[0002] DC contactor is an electrical component used to control the switch of DC circuit, which is widely used in new energy vehicles, charging piles, power systems, industrial automation and other fields. Ceramic high-voltage DC contactor is a kind of DC contactor. Compared with general DC contactors, it has the advantages of high performance and high reliability, and is suitable for a variety of high-voltage DC systems.
[0003] When the protective gas in the sealed cavity of the existing ceramic high-voltage DC contactor leaks, the arc extinguishing ability of the contactor is reduced, which ultimately affects the performance and life of the contactor. At the same time, the existing structure uses copper tubes to be inflated and then squeezed and sheared to make the arc extinguishing chamber a sealed environment, but most of the methods to determine whether the protective gas leaks after the contactor is used will destroy the copper tube structure, and the only solution after determining the leakage is to replace a new contactor, resulting in cost losses. Summary of the invention
[0004] The object of the present invention is to provide a ceramic high-voltage DC contactor with an air supply function to solve the problems raised in the above background technology.
[0005] In order to solve the above technical problems, the present invention provides the following technical solutions: a ceramic high-voltage DC contactor with an air replenishing function, comprising a ceramic cover, the ceramic cover is a hollow structure and is open on the lower side, a connecting frame is fixed to the lower side of the ceramic cover, the connecting frame is fixedly connected to a yoke iron plate, a relatively closed sealed cavity is formed between the ceramic cover, the connecting frame and the yoke iron plate, a through hole is opened on the yoke iron plate, the through hole is connected to a metal pipe for observing the air pressure in the sealed cavity.
[0006] According to the above technical solution, the metal tube is mainly composed of two parts: a tube body and a cap. The tube body is made of elastic metal material and is arranged as a hollow telescopic structure, one end of which is connected to the through hole opened on the yoke iron plate, and the other end is connected to the cap.
[0007] According to the above technical scheme, a mounting hole is opened on the ceramic cover, and an air supply structure is arranged in conjunction with the mounting hole. The air supply structure includes a base, which is penetrated from top to bottom and a sealing sleeve is arranged inside. A limited area 1, an active area and a limited area 2 are arranged inside the sealing sleeve in sequence. The diameter width of the limited area 1 is consistent with that of the limited area 2, and the diameter width of the active area is larger than that of the limited area 1 and the limited area 2. A push rod 1 is arranged in the sealing sleeve, and a spring 1 is arranged on the outer side of the push rod 1.
[0008] According to the above technical solution, push rod 1 includes a rod body, a force-applying part is fixed at one end of the rod body facing outward, and limit block 1 and limit block 2 are arranged on the rod body, wherein limit block 1 is located in the active area, and limit block 2 is located at the lower side of limit area 2, one end of spring 1 is against limit block 1, and the other end of spring 1 is against the active area.
[0009] According to the above technical solution, a cover is threadedly connected to the outer side of the base to provide protection and further improve the sealing performance; the base is connected to the mounting hole by welding.
[0010] According to the above technical solution, two fixed contacts are arranged on the upper side of the ceramic cover, and a moving contact piece structure is arranged on the yoke iron plate to match the fixed contacts. The moving contact piece structure includes an insulating seat, a limiting frame is arranged on the insulating seat, a second spring is connected to the upper side of the insulating seat, and the other end of the second spring is connected to a contact piece, and the contact piece is limited by the limiting frame.
[0011] According to the above technical solution, a push rod 2 is connected to the lower side of the insulating seat, a moving iron core is sleeved on the lower end of the push rod 2, a spring 3 is sleeved on the outer side of the push rod 2, one end of the spring 3 is against the yoke iron plate, and the other end of the spring 3 is against the moving iron core, a sleeve is provided on the outer side of the moving iron core, and a coil is sleeved on the outer side of the sleeve.
[0012] According to the above technical solution, a shell is sleeved on the outer side of the ceramic cover, and an end cover is fixed on the upper side of the shell.
[0013] Compared with the prior art, the beneficial effects achieved by the present invention are as follows: the present invention, by providing a metal tube, can determine whether the internal protective gas is leaking without disassembling the contactor from the whole machine, thereby improving work efficiency; by providing a gas replenishing structure, the protective gas can be repeatedly replenished, thereby extending the service life of the contactor and reducing the cumbersome process of replacing the contactor. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings: Figure 1 It is a schematic diagram of the overall structure of the contactor of the present invention; Figure 2 is a partial schematic diagram of the contactor of the present invention; Figure 3 is a cross-sectional view of a contactor of the present invention; Figure 4 The present invention Figure 3 A magnified schematic diagram of area A; Figure 5 The present invention Figure 4 A magnified schematic diagram of area B; Figure 6 It is a partial cross-sectional view of the movable contact piece structure of the present invention; In the figure: 1. ceramic cover; 11. fixed contact; 12. shell; 13. end cover; 2. connecting frame; 3. yoke iron plate; 4. metal tube; 41. tube body; 42. cap; 5. base; 51. cover; 6. sealing sleeve; 61. limit area one; 62. movable area; 63. limit area two; 7. push rod one; 71. rod body; 72. force-applying part; 73. limit block one; 74. limit block two; 8. spring one; 91. insulating seat; 92. limit frame; 93. spring two; 94. contact piece; 95. push rod two; 96. moving iron core; 97. spring three; 98. sleeve; 99. coil. DETAILED DESCRIPTION
[0015] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.
[0016] See also Figure 1-6 The present invention provides a technical solution: a ceramic high-voltage DC contactor with an air replenishing function, comprising a ceramic cover 1, the ceramic cover 1 is a hollow structure with an opening at the bottom, a connecting frame 2 is fixed to the bottom of the ceramic cover 1, a yoke iron plate 3 is fixedly connected to the connecting frame 2, a relatively closed sealed cavity is formed between the ceramic cover 1, the connecting frame 2 and the yoke iron plate 3, a through hole is opened on the yoke iron plate 3, a metal pipe 4 is connected to the through hole for observing the air pressure in the sealed cavity; Supplementary explanations based on the above structure are as follows: the metal tube 4 is mainly composed of a tube body 41 and a cap 42, wherein the tube body 41 is made of elastic metal material, and the tube body 41 is arranged as a hollow telescopic structure, one end of which is connected to the through hole opened on the yoke iron plate 3, and the other end is connected to the cap 42. Preferably, the tube body 41 and the cap 42 are detachably connected, using but not limited to a threaded connection. When the sealed cavity is in a normal air pressure state, the tube body 41 is in a stretched state; when the gas in the sealed cavity leaks, the internal air pressure is unbalanced, causing the tube body 41 to begin to shrink, and the shrinkage state of the tube body 41 changes synchronously according to the degree of gas leakage. The sealed cavity is an arc extinguishing cavity.
[0017] like Figures 4 and 5 As shown, a mounting hole is provided on the ceramic cover 1, and an air supply structure is provided in conjunction with the mounting hole. The air supply structure includes a base 5, which is penetrated from top to bottom and has a sealing sleeve 6 provided inside. A limited area 1 61, an active area 62 and a limited area 2 63 are provided inside the sealing sleeve 6 in sequence. The limited area 1 61 is consistent with the limited area 2 63 in diameter and width, and the active area 62 is wider than the limited area 1 61 and the limited area 2 63 in diameter. A push rod 1 7 is provided inside the sealing sleeve 6, and a spring 1 8 is provided on the outer side of the push rod 1 7.
[0018] Furthermore, the push rod 7 includes a rod body 71, a force-applying portion 72 is fixed to one end of the rod body 71 facing outward, a limit block 73 and a limit block 74 are provided on the rod body 71, wherein the limit block 73 is located in the active area 62, the limit block 74 is located at the lower side of the limit area 63, one end of the spring 8 is against the limit block 73, and the other end of the spring 8 is against the active area 62.
[0019] It should be supplemented that: under the action of spring 18, limit block 2 74 can block the lower opening of limit zone 2 63, so that the ceramic cover 1 is closed inside and outside. When the force application part 72 is pressed, limit block 1 73 compresses spring 18 downward, and limit block 2 74 moves downward to separate from the lower surface of limit zone 2 63, so that the ceramic cover 1 is connected inside and outside, which can be used to replenish air in the sealed cavity. When the internal air pressure is filled to the stretched state of metal tube 4, it can be done. After removing the external force, the internal air pressure of ceramic cover 1 is greater than the external air pressure, and spring 18 assists the internal air pressure to reset push rod 1 7, so that the sealed cavity is re-closed. Different from the existing sealing structure, a new contactor needs to be replaced after judging the leakage, the whole machine replacement process is cumbersome, and the cost of purchasing a new contactor is increased. In this design, the matching structure of push rod 1 7 and spring 1 8 allows the protective gas to be repeatedly replenished, prolongs the service life of the contactor, and reduces the cumbersome process of replacing the contactor.
[0020] In one embodiment, a cover 51 is threadedly connected to the outer side of the base 5 to provide protection and further improve the sealing performance; the base 5 is connected to the mounting hole by welding.
[0021] Two fixed contacts 11 are arranged opposite to each other on the upper side of the ceramic cover 1 , and a moving contact piece structure is arranged on the yoke iron plate 3 to match the fixed contacts 11 .
[0022] like Figure 6 As shown, the movable contact structure includes an insulating seat 91 , a limiting frame 92 is arranged on the insulating seat 91 , a second spring 93 is connected to the upper side of the insulating seat 91 , and a contact piece 94 is connected to the other end of the second spring 93 , and the contact piece 94 is limited by the limiting frame 92 .
[0023] A push rod 2 95 is connected to the lower side of the insulating seat 91, and a moving iron core 96 is sleeved on the lower end of the push rod 2 95. A spring 3 97 is sleeved on the outer side of the push rod 2 95. One end of the spring 3 97 abuts against the yoke iron plate 3, and the other end of the spring 3 97 abuts against the moving iron core 96. A sleeve 98 is provided on the outer side of the moving iron core 96, and a coil 99 is sleeved on the outer side of the sleeve 98.
[0024] In actual operation, by energizing the coil 99, a magnetic field is generated, the moving iron core 96 is magnetized, and the magnetic field acts on the yoke iron plate 3, generating an attractive force, so that the moving iron core 96 moves up and approaches the yoke iron plate 3, and the moving iron core 96 drives the push rod 2 95 to move up, so that the contact piece 94 contacts and closes with the two fixed contacts 11, thereby connecting the circuit. When the coil 99 is de-energized, the magnetic field disappears, the attractive force between the moving iron core 96 and the yoke iron plate 3 disappears, the spring 3 97 returns to the stretched state and drives the moving iron core 96 to reset, and the contact piece 94 separates from the two fixed contacts 11, thereby achieving a circuit break.
[0025] Optionally, a shell 12 is sleeved on the outer side of the ceramic cover 1 , and an end cover 13 is fixed on the upper side of the shell 12 .
[0026] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.
[0027] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. 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 ceramic high-voltage DC contactor with an air supply function, comprising a ceramic cover (1), characterized in that: The ceramic cover (1) is a hollow structure with an opening at the bottom, a connecting frame (2) is fixed at the bottom of the ceramic cover (1), the connecting frame (2) is fixedly connected to a yoke iron plate (3), and a relatively closed sealed cavity is formed between the ceramic cover (1), the connecting frame (2) and the yoke iron plate (3); The yoke iron plate (3) is provided with a through hole, and the through hole is connected to a metal tube (4) for observing the air pressure in the sealed cavity; The metal tube (4) mainly consists of two parts: a tube body (41) and a cap (42), wherein the tube body (41) is made of an elastic metal material, and the tube body (41) is configured as a hollow telescopic structure, one end of which is connected to a through hole provided on the yoke iron plate (3), and the other end of the tube body (41) is connected to the cap (42).
2. A ceramic high-voltage DC contactor with air supply function according to claim 1, characterized in that: When the sealed cavity is in a normal air pressure state, the tube body (41) is in a stretched state; When gas leaks from the sealed cavity, the internal gas pressure becomes unbalanced, causing the tube body (41) to begin to contract. Depending on the degree of gas leakage, the contraction state of the tube body (41) changes synchronously.
3. A ceramic high-voltage DC contactor with air supply function according to claim 1, characterized in that: The ceramic cover (1) is provided with a mounting hole, and the mounting hole is provided with an air supply structure, the air supply structure comprises a base (5), the base (5) is connected from top to bottom and a sealing sleeve (6) is provided inside, and the sealing sleeve (6) is provided inside with a limited area 1 (61), a movable area (62) and a limited area 2 (63) in sequence; The limiting area 1 (61) and the limiting area 2 (63) have the same diameter width, and the active area (62) has a diameter width greater than the diameter widths of the limiting area 1 (61) and the limiting area 2 (63); A push rod 1 (7) is arranged inside the sealing sleeve (6), and a spring 1 (8) is sleeved outside the push rod 1 (7).
4. A ceramic high-voltage DC contactor with air supply function according to claim 3, characterized in that: The push rod 1 (7) comprises a rod body (71), a force-applying portion (72) is fixed to an outward end of the rod body (71), and a limit block 1 (73) and a limit block 2 (74) are arranged on the rod body (71), wherein the limit block 1 (73) is located in the active area (62), and the limit block 2 (74) is located at the lower side of the limit block 2 (63), one end of the spring 1 (8) abuts against the limit block 1 (73), and the other end of the spring 1 (8) abuts against the active area (62).
5. A ceramic high-voltage DC contactor with air supply function according to claim 4, characterized in that: Under the action of spring one (8), limit block two (74) can cover the lower opening of limit zone two (63), so that the ceramic cover (1) is sealed inside and outside. When the force-applying portion (72) is pressed, limit block one (73) compresses spring one (8) downward, and limit block two (74) moves downward and separates from the lower surface of limit zone two (63), so that the inside and outside of the ceramic cover (1) are connected, and the sealed cavity can be used to replenish air. The internal air pressure is filled until the metal tube (4) is in a stretched state. After the external force is removed, the internal air pressure of the ceramic cover (1) is greater than the external air pressure. The spring one (8) assists the internal air pressure to reset the push rod one (7), so that the sealed cavity is re-sealed.
6. The ceramic high-voltage DC contactor with air supply function according to claim 4, characterized in that: The outer side of the base (5) is threadedly connected to a sealing cover (51) for providing protection and further improving sealing performance.
7. A ceramic high-voltage DC contactor with air supply function according to claim 6, characterized in that: Two fixed contacts (11) are arranged opposite to each other on the upper side of the ceramic cover (1), and a moving contact piece structure is arranged on the yoke iron plate (3) to cooperate with the fixed contacts (11).
8. The ceramic high-voltage DC contactor with air supply function according to claim 7, characterized in that: The movable contact piece structure comprises an insulating seat (91), a limiting frame (92) is arranged on the insulating seat (91), a second spring (93) is connected to the upper side of the insulating seat (91), the other end of the second spring (93) is connected to a contact piece (94), and the contact piece (94) is limited by the limiting frame (92).
9. The ceramic high-voltage DC contactor with air supply function according to claim 8, characterized in that: A push rod 2 (95) is connected to the lower side of the insulating seat (91), a movable iron core (96) is sleeved on the lower end of the push rod 2 (95), a spring 3 (97) is sleeved on the outer side of the push rod 2 (95), one end of the spring 3 (97) abuts against the yoke iron plate (3), and the other end of the spring 3 (97) abuts against the movable iron core (96), a sleeve (98) is arranged on the outer side of the movable iron core (96), and a coil (99) is sleeved on the outer side of the sleeve (98).
10. The ceramic high-voltage DC contactor with air supply function according to claim 9, characterized in that: An outer shell (12) is sleeved on the outside of the ceramic cover (1), and an end cover (13) is fixed on the upper side of the outer shell (12).