A high voltage DC contactor with a metal cover

Abstract

The present invention discloses a high-voltage DC contactor with a metal cover, comprising a frame, an arc extinguishing system, a static contact and a moving contact arranged in the frame, the lead-out end of the static contact extending from a mounting hole opened at the upper end of the frame, the lower end of the static contact located between the arc extinguishing system, the moving contact located at the lower part of the static contact, the bottom of the frame welded to a yoke plate, the yoke plate also provided with a support plate, the bottom of the arc extinguishing system mounted on the support plate, the frame also comprising a metal cover, the metal cover covering the frame, the bottom of the metal cover welded to the yoke plate. Compared with the prior art, the metal cover has a simple processing technology, the metal cover and the yoke plate are laser welded, so that the metal cover and the sealing structure body can be tightly connected to each other, the sealing performance is improved, and the assembly is more efficient, safe and environmentally friendly. In addition, since it is made of metal material, the cost is saved.

Description

Technical Field

[0001] The invention relates to the technical field of high-voltage contactors, and in particular to a high-voltage direct current contactor with a metal cover. Background Art

[0002] The biggest difference between high-voltage DC contactors and ordinary contactors is that ultra-high voltage DC contactors use a unique sealing technology to seal the contact points of the high-voltage DC contactors in a cavity and isolate them from the outside air to obtain higher voltage resistance. Load switching is not used when switching contacts. It is mainly used for backup devices and mechanisms that require high-voltage channels.

[0003] The most critical part of the high-voltage DC contactor is the contact part that completes the high-voltage conversion. It is sealed in a high-voltage cavity. At the moment the contactor switches the load, an arc will be generated between the moving contact and the static contact. The size of the arc increases exponentially with the system voltage. The higher the voltage, the larger the arc. The arc is one of the main factors for contactor contact wear.

[0004] At present, most high-voltage DC contactors use copper-based contacts. Copper-based contacts are very easy to oxidize in the air, resulting in a decrease in product performance. A sealed cavity is required to prevent electric shock and oxidation. One way to solve the arc is to remove the air around the contactor contacts to keep the contacts in a stable switching environment, that is, the contactor contacts work in a vacuum insulation environment. At this time, even a small contact gap can maintain a high breakdown voltage. Experimental research has shown that in a vacuum environment, a 1mm contact gap can withstand a breakdown voltage of about 13,000V. High-voltage DC contactors use this principle to design the contact part of the contactor into a vacuum environment to ensure reliable switching of high-voltage and high-current loads.

[0005] Since vacuum devices have high requirements for insulating dielectric materials, ceramics are widely used in vacuum devices. However, the disadvantages of ceramic parts are also obvious: the molding of ceramic parts requires high-temperature sintering; the metal sealing process between ceramic parts and other metal parts such as static contacts and sealing rings is complicated, and the connection between metal parts requires relatively complex processes such as brazing or argon arc welding.

[0006] The manufacturing of ceramic parts and the assembly process between them and metal parts are complex and inefficient, making it difficult to adapt to the mass production requirements of this type of contactor.

[0007] Therefore, the present invention needs to provide a high-voltage DC contactor with a metal sealing structure to solve the problems of complex process, low efficiency, high cost, etc. caused by welding ceramics and metal parts in the prior art. Summary of the invention

[0008] The object of the present invention is to provide a high-voltage DC contactor with a metal sealing structure, so as to solve the above-mentioned problems existing in the prior art.

[0009] In order to achieve the above object, the technical solution adopted by the present invention is as follows: A high-voltage DC contactor with a metal cover comprises a frame, an arc extinguishing system, a static contact and a moving contact are arranged in the frame, the lead end of the static contact extends from a mounting hole provided at the upper end of the frame, the lower end of the static contact is located between the arc extinguishing system, the moving contact is located at the lower part of the static contact, the bottom of the frame is welded to a yoke plate, a support plate is further provided on the yoke plate, the bottom of the arc extinguishing system is mounted on the support plate, the frame further comprises a metal cover, the metal cover is covered on the frame, and the bottom of the metal cover is welded to the yoke plate; The arc extinguishing system comprises: the first arc extinguishing assembly, the second arc extinguishing assembly, the third arc extinguishing assembly and the fourth arc extinguishing assembly each comprise a mounting frame and a plurality of arc extinguishing grids, the arc extinguishing grids are mounted on the mounting frame, the first arc extinguishing assembly and the third arc extinguishing assembly are arranged on a frame on one side of the frame along the length direction, and the second arc extinguishing assembly and the fourth arc extinguishing assembly are arranged on a frame on the other side of the frame along the length direction; The upper end of the metal cover is also provided with an anti-overflow ring, the upper end of the anti-overflow ring is higher than the upper surface of the metal cover, the upper end of the metal cover is sealed by an epoxy resin adhesive layer, the upper surface of the epoxy resin adhesive layer is flush with the upper end of the anti-overflow ring or lower than the anti-overflow ring, and the anti-overflow ring is used to prevent the epoxy resin adhesive layer from overflowing; A sealing ring is also provided between the lead-out end and the mounting hole.

[0010] Furthermore, the metal cover includes a frame and a top plate, the four sides of the top plate are fixedly mounted on the upper end of the frame, and the upper end of the top plate is reserved with a through hole for mounting the lead-out terminal.

[0011] Furthermore, an outer edge is provided at the lower end of the metal cover, one end of the outer edge close to the metal cover is connected to the metal cover, and the other end of the outer edge extends to a side away from the metal cover.

[0012] Furthermore, the anti-overflow ring includes an upper part and a lower part, the lower end of the upper part is connected to the lower part through a connecting part, and the inner diameter of the upper part is greater than the inner diameter of the lower part.

[0013] Furthermore, the upper portion, the connecting portion and the lower portion are formed in one piece.

[0014] Furthermore, the metal cover and the yoke plate are welded by laser welding.

[0015] Furthermore, a first insulating plate is provided between the first arc extinguishing assembly and the second arc extinguishing assembly, a second insulating plate is provided between the third arc extinguishing assembly and the fourth arc extinguishing assembly, and magnetic steel plates are provided at the ends away from each other and the ends close to each other of the first insulating plate and the second insulating plate.

[0016] Furthermore, the anti-overflow ring is made of insulating material.

[0017] Furthermore, a mounting groove for mounting a sealing ring is provided in the mounting hole.

[0018] Furthermore, a plurality of anti-retraction mechanisms are provided in the mounting hole, and the anti-retraction mechanisms are used to prevent the lead-out end from retreating from the mounting hole.

[0019] The beneficial effects of the present invention are: Since the present invention sets a metal cover outside the sealing structure body, the processing technology of the metal cover is simple, and laser welding is adopted between the metal cover and the yoke plate, so that the metal cover and the sealing structure body can be tightly connected with each other, thereby improving the sealing performance and making the assembly more efficient, safe and environmentally friendly. In addition, since it is made of metal material, the cost is saved. In addition, it should be noted that by setting up an arc extinguishing system and arranging a magnetic steel on the arc extinguishing system, physical isolation can be effectively performed through the magnetic steel, thereby effectively preventing arc breakdown. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of a high-voltage DC contactor with a metal cover according to the present invention; Figure 2 It is an exploded view of the structural schematic diagram of a high-voltage DC contactor with a metal cover according to the present invention.

[0021] Reference numerals: Frame 1, lead end 2, mounting hole 3, yoke plate 4, support plate 5, metal cover 6, moving contact 7, first arc extinguishing assembly 8, second arc extinguishing assembly 9, third arc extinguishing assembly 10, fourth arc extinguishing assembly 11, anti-overflow ring 12, sealing ring 13, through hole 14, outer edge 15, first insulating plate 16, second insulating plate 17, magnetic steel plate 18, mounting groove 19, and outer shell 20. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation methods described herein are only used to explain the present invention and are not used to limit the present invention.

[0023] Among them, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention or simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0024] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0025] The word “exemplary” is used exclusively herein to mean “serving as an example, example, or illustration.” Any embodiment described herein as “exemplary” is not necessarily to be construed as preferred or advantageous over other embodiments.

[0026] In addition, in order to better illustrate the present application, numerous specific details are given in the following specific embodiments. It should be understood by those skilled in the art that the present application can also be implemented without certain specific details. In some examples, methods, means, components and circuits well known to those skilled in the art are not described in detail in order to highlight the subject matter of the present application.

[0027] like Figure 1 and Figure 2 As shown, a high-voltage DC contactor with a metal cover comprises a frame 1, an arc extinguishing system, a static contact and a moving contact 7 are arranged in the frame 1, the lead-out terminal 2 of the static contact extends from a mounting hole 3 provided at the upper end of the frame 1, the lower end of the static contact is located between the arc extinguishing system, the moving contact 7 is located at the lower part of the static contact, the bottom of the frame 1 is welded to a yoke plate 4, a support plate 5 is further provided on the yoke plate 4, the bottom of the arc extinguishing system is mounted on the support plate 5, the frame 1 also comprises a metal cover 6, the metal cover 6 covers the frame 1, and the bottom of the metal cover 6 is welded to the yoke plate 4; The arc extinguishing system includes: the first arc extinguishing assembly 8, the second arc extinguishing assembly 9, the third arc extinguishing assembly 10 and the fourth arc extinguishing assembly 11 all include a mounting frame and a plurality of arc extinguishing grids, the arc extinguishing grids are mounted on the mounting frame, the first arc extinguishing assembly 8 and the third arc extinguishing assembly 10 are arranged on a frame on one side of the frame 1 along the length direction, and the second arc extinguishing assembly 9 and the fourth arc extinguishing assembly 11 are arranged on a frame on the other side of the frame 1 along the length direction; The upper end of the metal cover 6 is also provided with an anti-overflow ring 12, the upper end of the anti-overflow ring 12 is higher than the upper surface of the metal cover, the upper end of the metal cover 6 is sealed by an epoxy resin adhesive layer, the upper surface of the epoxy resin adhesive layer is flush with the upper end of the anti-overflow ring 12 or lower than the anti-overflow ring 12, and the anti-overflow ring 12 is used to prevent the epoxy resin adhesive layer from overflowing; It also includes a housing 20, wherein the housing 20 covers the metal cover and the anti-overflow ring; A sealing ring 13 is further provided between the lead-out end 2 and the mounting hole 3 .

[0028] Through the above method, it can be known that since the present invention sets a metal cover 6 on the outside of the sealing structure body, the processing technology of the metal cover 6 is simple, and laser welding is adopted between the metal cover 6 and the yoke plate 4, so that the metal cover 6 and the frame can be tightly connected to each other, thereby improving the sealing performance and making the assembly more efficient, safe and environmentally friendly. In addition, since it is made of metal material, the cost is saved; in addition, it should be noted that through the arc extinguishing system set up and the magnetic steel arranged on the arc extinguishing system, the magnetic steel can effectively perform physical isolation, effectively prevent arc breakdown, and effectively extend the service life of the product.

[0029] Specifically, the metal cover 6 includes a frame and a top plate. The four sides of the top plate are fixedly installed on the upper end of the frame. The upper end of the top plate is reserved with a through hole 14 for installing the lead-out terminal. In the present embodiment, the top plate and the frame are made in an integrally formed manner. The upper end of the top plate is reserved with a mounting hole for installing the lead-out terminal. During assembly, the metal cover 6 is covered on the frame. In addition, it should be noted that due to the laser welding used between the metal cover 6 and the yoke plate 4, a tight connection between them is ensured to avoid deformation of the metal cover between the metal cover and the yoke plate or falling off of the yoke plate when the air pressure in the frame increases and expands, thereby extending the service life of the high-voltage DC contactor.

[0030] In addition, in order to increase the welding area between the metal cover 6 and the yoke plate 4, an outer edge 15 is further provided at the lower end of the metal cover. The outer edge 15 and the metal cover 6 are made in an integrally formed manner, thereby ensuring that the metal cover 6 and the outer edge 15 can be tightly connected to each other. One end of the outer edge 15 close to the metal cover 6 is connected to the metal cover 6, and the other end of the outer edge 15 extends to a side away from the metal cover 6.

[0031] In addition, it should be noted that the anti-overflow ring 12 includes an upper part and a lower part, the lower end of the upper part is connected to the lower part through a connecting part, the inner diameter of the upper part is greater than the inner diameter of the lower part, and the upper part, the connecting part and the lower part are made by integral molding. During assembly, the anti-overflow ring is installed on the upper end of the metal cover, and an epoxy resin adhesive layer of a certain thickness is formed after the epoxy resin adhesive is cured, so that the lead-out end and the metal cover can be fastened and sealed. The inside of the frame 1 is vacuumed to form a vacuum chamber. In this embodiment, the anti-overflow ring 12 is made of insulating material; Handles are also provided on both sides of the upper part, and the anti-overflow ring 12 can be easily removed from or installed on the metal cover 6 through the provided handles, which is very convenient to use.

[0032] Furthermore, a first insulating plate 16 is provided between the first arc extinguishing assembly 8 and the second arc extinguishing assembly 9, a second insulating plate 17 is provided between the third arc extinguishing assembly 10 and the fourth arc extinguishing assembly 11, and magnetic steel plates 18 are provided at the ends of the first insulating plate and the second insulating plate far away from each other and at the ends close to each other. Physical isolation is adopted between the two groups of arc extinguishing assemblies on the same side to prevent breakdown; the magnetic steel plates 18 arranged on the first insulating plate 16 and the second insulating plate 17 can be in any direction, such as N / S relative, N / N relative, S / S relative, which has no effect on product performance. Therefore, the performance of the high-voltage DC contactor is improved while reducing the cost of error prevention and manufacturing cost during assembly.

[0033] In order to facilitate the installation of the sealing ring 13, an installation groove 19 for installing the sealing ring 13 is further provided in the installation hole. During assembly, the sealing ring is installed in the installation groove 19, and the side of the installation groove 19 close to the installation hole 3 is connected to the inner wall of the installation hole 3. In order to make the installation groove 19 firmly connected to the installation hole 3, the side of the installation groove 19 close to the installation hole 3 is connected to the inner wall of the installation hole 3 by an integral molding manner, thereby ensuring that the installation groove 19 and the installation hole 3 can be tightly connected and firmly fixed to each other.

[0034] Furthermore, it should be noted that a plurality of anti-retraction mechanisms are provided in the mounting hole 3, and the anti-retraction mechanisms are used to prevent the lead-out terminal from withdrawing from the mounting hole. The anti-retraction mechanisms can effectively prevent the lead-out terminal 3 from withdrawing from the mounting hole, and can ensure the compression amount of the sealing ring 13, thereby enhancing the air tightness of the product, and then sealing with epoxy resin glue. Even if the sealant ages and fails, there is still a sealing ring to seal, thereby reducing the risk of product leakage and extending or ensuring the life of the product.

[0035] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be considered as the scope of protection of the present invention.

Claims

1. A high-voltage DC contactor with a metal cover, comprising a frame, an arc extinguishing system, a static contact and a moving contact arranged in the frame, the lead end of the static contact extending from a mounting hole provided at the upper end of the frame, the lower end of the static contact being located between the arc extinguishing system, the moving contact being located at the lower part of the static contact, the bottom of the frame being welded to a yoke plate, the yoke plate being further provided with a support plate, the bottom of the arc extinguishing system being mounted on the support plate, characterized in that: The frame further comprises a metal cover, the metal cover is covered on the frame, and the bottom of the metal cover is welded to the yoke plate; The arc extinguishing system comprises: the first arc extinguishing assembly, the second arc extinguishing assembly, the third arc extinguishing assembly and the fourth arc extinguishing assembly each comprise a mounting frame and a plurality of arc extinguishing grids, the arc extinguishing grids are mounted on the mounting frame, the first arc extinguishing assembly and the third arc extinguishing assembly are arranged on a frame on one side of the frame along the length direction, and the second arc extinguishing assembly and the fourth arc extinguishing assembly are arranged on a frame on the other side of the frame along the length direction; The upper end of the metal cover is also provided with an anti-overflow ring, the upper end of the anti-overflow ring is higher than the upper surface of the metal cover, the upper end of the metal cover is sealed by an epoxy resin adhesive layer, the upper surface of the epoxy resin adhesive layer is flush with the upper end of the anti-overflow ring or lower than the anti-overflow ring, and the anti-overflow ring is used to prevent the epoxy resin adhesive layer from overflowing; A sealing ring is also provided between the lead-out end and the mounting hole.

2. The high voltage DC contactor with a metal cover according to claim 1, characterized in that: The metal cover comprises a frame and a top plate. The four sides of the top plate are fixedly mounted on the upper end of the frame. The upper end of the top plate is reserved with a through hole for mounting the lead-out terminal.

3. The high voltage DC contactor with a metal cover according to claim 2, characterized in that: An outer edge is also provided at the lower end of the metal cover, one end of the outer edge close to the metal cover is connected to the metal cover, and the other end of the outer edge extends to a side away from the metal cover.

4. The high voltage DC contactor with a metal cover according to claim 1, characterized in that: The anti-overflow ring includes an upper part and a lower part, the lower end of the upper part is connected to the lower part through a connecting part, and the inner diameter of the upper part is greater than the inner diameter of the lower part.

5. The high voltage DC contactor with a metal cover according to claim 4, characterized in that: The upper part, the connecting part and the lower part are made in an integrally formed manner.

6. The high voltage DC contactor with a metal cover according to claim 1, characterized in that: The metal cover and the yoke plate are welded by laser welding.

7. The high voltage DC contactor with a metal cover according to claim 1, characterized in that: A first insulating plate is provided between the first arc extinguishing assembly and the second arc extinguishing assembly, a second insulating plate is provided between the third arc extinguishing assembly and the fourth arc extinguishing assembly, and magnetic steel plates are provided at the ends away from each other and the ends close to each other of the first insulating plate and the second insulating plate.

8. The high voltage DC contactor with a metal cover according to claim 4, characterized in that: The anti-overflow ring is made of insulating material.

9. The high voltage DC contactor with a metal cover according to claim 1, characterized in that: An installation groove for installing a sealing ring is also provided in the installation hole.

10. The high voltage DC contactor with a metal cover according to claim 9, characterized in that: A plurality of anti-retraction mechanisms are also arranged in the mounting hole, and the anti-retraction mechanisms are used to prevent the lead-out end from retreating from the mounting hole.

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