Miniaturized high-current-carrying high-voltage direct current contactor

Abstract

The utility model discloses a miniaturized high-current-carrying high-voltage direct current contactor, which comprises a shell, an arc extinguishing cavity and a contact structure, and is characterized in that the arc extinguishing cavity is fixedly arranged in the shell; the contact structure is provided with a movable contact piece which is movably arranged in the arc extinguishing cavity and a static contact which is fixedly arranged on the arc extinguishing cavity in the mode that one end of the static contact is inserted into the arc extinguishing cavity and the other end of the static contact extends out of the arc extinguishing cavity and the shell, and the static contact and the movable contact piece are oppositely arranged. The end, extending out of the shell, of the static contact is fixedly connected with a leading-out piece used for being connected into an external electrical loop. The moving contact piece, the static contact, the leading-out piece and the shell are respectively provided with a heat dissipation structure. The high-voltage direct-current contactor is novel, simple and reasonable in structure and excellent in heat dissipation performance, the working reliability and stability of the high-voltage direct-current contactor are greatly improved, and the service life of the high-voltage direct-current contactor is effectively prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of contactors, in particular to a miniaturized high-current-carrying and high-voltage DC contactor. Background Art

[0002] With the increasing popularity of new energy vehicles, interior space and weight restrictions are becoming increasingly stringent. To integrate more electrical components within this limited space, high-voltage DC contactors need to be miniaturized to improve vehicle energy efficiency and performance. However, as high-voltage DC contactors shrink in size, heat generated by the contactors becomes difficult to dissipate, resulting in increased temperature rise. In extreme cases, this can even cause plastic components within the contactors to melt, leading to product failure.

[0003] Therefore, how to effectively improve the heat dissipation performance of contactor products has become a technical problem that urgently needs to be solved in the current contactor technology field. In view of this, the present utility model is proposed. Summary of the Invention

[0004] In order to overcome the above-mentioned defects, the utility model provides a miniaturized high-current-carrying high-voltage DC contactor, which has a novel, simple and reasonable structure and excellent heat dissipation performance, greatly improves its working reliability and stability, and effectively prolongs its service life.

[0005] The technical solution adopted by the present invention to solve its technical problems is: a miniaturized high-current-carrying high-voltage DC contactor, comprising a housing, an arc extinguishing chamber, a contact structure and a driving device, wherein the arc extinguishing chamber is fixedly built into the housing, and the contact structure is provided with a movable contact piece movably built into the arc extinguishing chamber and a static contact fixedly arranged on the arc extinguishing chamber in a manner that one end is inserted into the arc extinguishing chamber and the other end extends out of the arc extinguishing chamber and the housing, the static contact and the movable contact are arranged opposite to each other, and a contact for accessing the static contact is fixedly connected to the end of the static contact extending out of the housing. The lead-out piece of the external electrical circuit, the driving device is built into the housing and can drive the moving contact piece to engage or disconnect with the static contact; a plurality of heat dissipation bumps are convexly provided on the back surface of the moving contact piece facing away from the static contact; the static contact is a cylindrical structure, and heat dissipation fins are radially extended outward on the outer surface of the end of the static contact extending outside the housing; a heat sink B is fixedly provided on the lead-out piece, and the heat sink B is close to the static contact; a cooling fan is provided on the housing, and the cooling fan is electrically connected to the coil winding in the driving device.

[0006] As a further improvement of the present invention, a heat sink A is fixedly provided on the back surface of the movable contact piece facing away from the static contact.

[0007] As a further improvement of the present invention, the heat dissipation fins are configured in plurality and are arranged at equal intervals along the central axis of the static contact.

[0008] As a further improvement of the present invention, a plurality of cooling fans are correspondingly provided on the housing and respectively surround the contact structure, the lead-out member and the driving device.

[0009] As a further improvement of the present invention, the driving device further comprises a moving iron core and a push rod, wherein the moving iron core is movably arranged in the space surrounded by the coil winding, one end of the push rod is fixedly inserted into the moving iron core, and the other end of the push rod is sealed and extends into the arc extinguishing cavity and is connected to the moving contact piece;

[0010] In addition, the plurality of heat dissipation fans are electrically connected to the coil windings respectively.

[0011] As a further improvement of the present invention, the arc extinguishing chamber is filled with nitrogen, hydrogen or a mixture of the two.

[0012] The beneficial effects of the present invention are as follows: Compared with the prior art, ① the present invention provides heat dissipation structures on the movable contact, the static contact, the lead-out member, and the housing, thereby effectively improving the heat dissipation performance of the high-voltage DC contactor while miniaturizing the product volume, thereby greatly improving the operating reliability and stability of the high-voltage DC contactor and effectively extending the service life of the high-voltage DC contactor. ② The high-voltage DC contactor of the present invention has a novel, simple, and reasonable structure, is easy to process and manufacture, and has a low manufacturing cost, which is conducive to production implementation. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic diagram of the three-dimensional structure of the miniaturized high-current-carrying high-voltage DC contactor of the utility model;

[0014] Figure 2 for Figure 1 Schematic diagram of the cross-sectional structure of the high-voltage DC contactor shown in;

[0015] Figure 3 for Figure 2 Schematic diagram of the structure of the contact with the heat sink A at a first viewing angle;

[0016] Figure 4 for Figure 2 Schematic diagram of the structure of the contact with the heat sink A at a second viewing angle;

[0017] Figure 5 for Figure 4 Schematic diagram of the bottom view of the moving contact piece shown in .

[0018] The following description is made with reference to the accompanying drawings:

[0019] 1. Housing; 2. Arc-extinguishing chamber; 20. Arc-extinguishing cover; 21. Pole plate; 3. Contact structure; 30. Moving contact piece; 300. Heat dissipation bump; 31. Static contact; 310. Heat dissipation fin; 4. Lead-out piece; 5. Heat sink A; 6. Heat sink B; 7. Cooling fan; 80. Coil winding; 81. Moving iron core; 82. Push rod; 83. Contact spring; 84. Return spring. DETAILED DESCRIPTION

[0020] The preferred embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0021] Example

[0022] Please see the attached Figure 1 To the attached Figure 5As shown, this embodiment provides a high-voltage DC contactor, including a shell 1, a magnetic pole plate 21, an arc extinguishing cover 20, a contact structure 3 and a drive device, wherein the magnetic pole plate 21 is positioned and built into the shell 1, and the inner cavity of the shell 1 is divided into an upper cavity and a lower cavity arranged up and down; the arc extinguishing cover 20 is built into the upper cavity, and is fixed and sealed on the upper surface of the magnetic pole plate 21 through a frame. At that time, the arc extinguishing cover 20 and the upper surface of the magnetic pole plate 21 are enclosed to form an arc extinguishing cavity 2. It can be understood that the arc extinguishing The cavity 2 is fixedly arranged in the upper cavity of the housing 1; the contact structure 3 includes a moving contact piece 30 and a pair of static contacts 31, the moving contact piece 30 is movably built into the arc extinguishing cavity 2, and the pair of static contacts 31 are respectively inserted into the arc extinguishing cavity 2 at one end and extended out of the arc extinguishing cavity 2 and the housing 1. They are arranged side by side and fixed on the arc extinguishing cover 20. At the same time, the pair of static contacts 31 are also respectively arranged relative to the moving contact piece 30 in an upper and lower direction. In addition, the pair of static contacts 31 extend out of the upper cavity outside the housing 1. The ends are also fixedly connected with lead-out pieces 4 for accessing external electrical circuits; the driving device includes a coil winding 80, a moving iron core 81 and a push rod 82, the coil winding 80 is fixedly arranged in the lower cavity, the moving iron core 81 is movably arranged in the space surrounded by the coil winding 80, the lower end of the push rod 82 is fixedly inserted into the moving iron core 81, the upper end of the push rod 82 is sealed and extends into the arc extinguishing cavity 2, and is connected to the moving contact piece 30 through a contact spring 83, and the lower part of the push rod 82 is also sleeved with a The push rod 82 provides a return spring 84 with elastic return force. When the coil winding 80 is connected to an external power source, the push rod 82 can drive the movable contact piece 30 to move closer to the pair of static contacts 31, so that the movable contact piece 30 and the pair of static contacts 31 are attracted and connected. When the coil winding 80 loses power, the push rod 82 elastically returns to its original position, driving the movable contact piece 30 to move away from the pair of static contacts 31, that is, disconnecting the movable contact piece 30 from the pair of static contacts 31. In particular, this embodiment further provides heat dissipation structures on the movable contact piece 30, the static contact 31, the lead-out member 4, and the housing 1, respectively, to effectively improve the heat dissipation performance of the high-voltage DC contactor while miniaturizing the high-voltage DC contactor product, thereby greatly improving the working reliability and stability of the high-voltage DC contactor and effectively extending the service life of the high-voltage DC contactor.

[0023] The specific structure of the heat dissipation structure provided on the high-voltage DC contactor according to this embodiment is described in detail below.

[0024] Please continue to refer to the attached Figure 2 and attached Figure 5As shown, in this embodiment, a plurality of heat dissipation bumps 300 are integrally provided on the back surface (i.e., the lower surface) of the movable contact piece 30 facing away from the static contact 31. It is understood that by providing the heat dissipation bumps 300 on the back surface of the movable contact piece 30, the heat dissipation area of the movable contact piece 30 is effectively increased without affecting the contact connection with the static contact 31. This allows the heat generated by the movable contact piece 30 to be better dissipated to the surrounding area, effectively improving the stability and reliability of the high-voltage DC contactor during long-term high-load operation.

[0025] Furthermore, in this embodiment, the heat dissipation bumps 300 may be arranged regularly or irregularly according to design requirements. Of course, this application does not impose any restrictions on the specific shape, number, and arrangement of the heat dissipation bumps 300, as long as they meet electrical and heat dissipation requirements.

[0026] Furthermore, in this embodiment, a heat sink A5 is fixedly provided on the back surface (i.e., the lower surface) of the movable contact piece 30 facing away from the static contact 31. Figure 2 To the attached Figure 4 As shown. Furthermore, the heat sink A5 may be made of, but not limited to, copper, aluminum, graphite, or phase change material (PCM) materials. As will be appreciated, the provision of the heat sink A5 assists in dissipating heat from the movable contact piece 30, allowing heat to be more effectively transferred to the heat sink A5 and then dissipated to the surrounding area, further effectively improving the stability and reliability of the high-voltage DC contactor during prolonged, high-load operation.

[0027] Please continue to refer to the attached Figure 2 To the attached Figure 4 As shown, in this embodiment, a heat dissipation fin 310 is integrally provided on the upper end of each static contact 31 extending outside the housing 1. It is understood that the heat dissipation fin 310 can effectively increase the heat dissipation area of the static contact 31, thereby effectively improving the heat transfer efficiency of the static contact 31, thereby effectively improving the stability and reliability of the high-voltage DC contactor during long-term high-load operation.

[0028] For further information, please refer to the attached Figure 3 and attached Figure 4 As shown, based on the cylindrical structure of the static contact 31, the heat dissipation fins 310 are formed by radially extending outward from the outer surface of the upper end of the static contact 31, which extends outside the arc-extinguishing chamber 2 and the housing 1. In addition, according to product design requirements, the heat dissipation fins 310 on each static contact 31 are configured in multiples and are arranged at equal intervals along the central axis of the static contact 31.

[0029] For further information, please refer to the attached Figure 3 and attached Figure 4 As shown, the number of heat dissipation fins 310 on each of the static contacts 31 is configured as three, wherein the two upper heat dissipation fins 310 are circular ring-shaped structures extending radially outward from the outer surface of the upper end of the static contact 31, and the lowermost heat dissipation fin 310 is an annular groove structure extending radially outward and downward from the outer surface of the upper end of the static contact 31 (in addition to heat dissipation, the heat dissipation fins 310 also function as a snap-fit assembly with the arc extinguishing cover 20). Of course, the number and specific structure of the heat dissipation fins 310 are determined according to product design requirements and are not restricted in this application.

[0030] Please continue to refer to the attached Figure 1 and attached Figure 2 As shown, in this embodiment, the lead-out member 4 is a copper busbar, and a heat sink B6 is fixedly mounted on the lead-out member 4, and the heat sink B6 is also close to the static contact 31. Furthermore, the heat sink B6 may be made of, but not limited to, copper, aluminum, graphite, or phase change material (PCM) materials. It is understood that the provision of the heat sink B6 assists in dissipating heat from the lead-out member 4 and the static contact 31, further effectively improving the stability and reliability of the high-voltage DC contactor during prolonged, high-load operation.

[0031] Please continue to refer to the attached Figure 1 and attached Figure 2 As shown, in this embodiment, a cooling fan 7 is provided on the housing 1. Specifically, a plurality of cooling fans 7 are provided on the housing 1 at positions surrounding the contact structure 3, the lead-out member 4, and the outside of the drive device. It can be understood that by providing the cooling fans 7, the heat dissipation performance of the high-voltage DC contactor can be effectively improved.

[0032] Furthermore, the cooling fan 7 is arranged above the heat sink B6 to further improve the heat dissipation effect of the static contact 31 and the lead-out member 4.

[0033] Furthermore, according to product design requirements, the heat dissipation fan 7 may preferably be a DC axial flow fan, an AC axial flow fan, a centrifugal fan or a worm gear fan, etc., and this application does not impose any restriction requirements.

[0034] Furthermore, the multiple cooling fans 7 in this embodiment are electrically connected to the coil winding 80 respectively, that is, the cooling fans 7 and the coil winding 80 share a low-voltage power supply. In this way, when the contact structure 3 is in the attracted and connected state, the cooling fans 7 are started and dissipate heat, which effectively ensures the stability, reliability and safety of the contactor during operation.

[0035] In addition, please refer to the attached Figure 2 As shown, based on the arc-extinguishing chamber 2 being a sealed chamber, this embodiment fills the arc-extinguishing chamber 2 with nitrogen, hydrogen, or a mixture of the two. It is understood that: ① Nitrogen is an inert gas that effectively isolates the air and prevents oxidation of the contacts in the contactor. The presence of nitrogen also helps extinguish the arc. Furthermore, nitrogen has excellent heat dissipation properties, which can help reduce the temperature within the arc-extinguishing chamber 2, thereby effectively improving the reliability and service life of the contactor. ② Hydrogen has excellent thermal conductivity (i.e., high thermal conductivity), which can quickly conduct heat generated by the arc, improving heat dissipation. Furthermore, hydrogen decomposes under the action of the arc, absorbing a large amount of heat, further reducing the arc temperature and facilitating arc extinguishing. In summary, this embodiment, by filling the arc-extinguishing chamber 2 with nitrogen, hydrogen, or a mixture of the two, effectively reduces the temperature within the arc-extinguishing chamber 2, improves heat dissipation, and also facilitates arc extinguishing.

[0036] In summary, the high-voltage DC contactor provided in this application has a novel, simple, and reasonable structure and excellent heat dissipation performance, which greatly improves its working reliability and stability and effectively extends its service life.

[0037] In the above description, many specific details are set forth in order to fully understand 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 skilled in the art can use the above-disclosed methods and technical contents to make many possible changes and modifications to the technical solution of the present invention 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 miniaturized high-current-carrying high-voltage DC contactor, comprising a housing (1), an arc extinguishing chamber (2), a contact structure (3) and a drive device, wherein the arc extinguishing chamber (2) is fixedly built into the housing (1), the contact structure (3) is provided with a movable contact piece (30) movably built into the arc extinguishing chamber (2) and a static contact (31) fixedly arranged on the arc extinguishing chamber (2) in a manner such that one end is inserted into the arc extinguishing chamber (2) and the other end extends outside the arc extinguishing chamber (2) and the housing (1), the static contact (31) and the movable contact piece (30) are arranged opposite to each other, and a lead (4) for connecting to an external electrical circuit is fixedly connected to the end of the static contact (31) extending outside the housing (1), the drive device is built into the housing (1) and can drive the movable contact piece (30) and the static contact (31) to be attracted, connected or disconnected; characterized in that: A plurality of heat dissipation protrusions (300) are provided on the back side of the movable contact piece (30) facing away from the static contact (31); the static contact (31) is a cylindrical structure, and a heat dissipation fin (310) is formed on the outer surface of one end of the static contact (31) extending outward from the housing (1) and extending radially outward; a heat dissipation fin B (6) is fixedly provided on the lead-out member (4), and the heat dissipation fin B (6) is close to the static contact (31); a heat dissipation fan (7) is provided on the housing (1), and the heat dissipation fan (7) is electrically connected to the coil winding (80) in the driving device.

2. The miniaturized high current carrying high voltage DC contactor according to claim 1, characterized in that: A heat sink A (5) is fixedly provided on the back surface of the moving contact piece (30) facing away from the static contact (31).

3. The miniaturized high current carrying high voltage DC contactor according to claim 1, characterized in that: The heat dissipation fins (310) are configured in plurality and are arranged at equal intervals along the central axis of the static contact (31).

4. The miniaturized high current carrying high voltage DC contactor according to claim 1, characterized in that: A plurality of cooling fans (7) are correspondingly provided on the housing (1) and respectively surround the contact structure (3), the lead-out member (4) and the outside of the drive device.

5. The miniaturized high current carrying high voltage DC contactor according to claim 4, characterized in that: The driving device further comprises a moving iron core (81) and a push rod (82), wherein the moving iron core (81) is movably arranged in a space surrounded by the coil winding (80), one end of the push rod (82) is fixedly inserted into the moving iron core (81), and the other end of the push rod (82) is sealed and extends into the arc extinguishing chamber (2) and is connected to the moving contact piece (30); In addition, the plurality of cooling fans (7) are electrically connected to the coil winding (80) respectively.

6. The miniaturized high current carrying high voltage DC contactor according to claim 1, characterized in that: The arc extinguishing chamber (2) is filled with nitrogen, hydrogen or a mixture of the two.

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