High-power high-voltage direct current contactor

Abstract

The utility model discloses a high-power high-voltage direct-current contactor, which comprises a shell, a binding post is arranged at the top of the shell, the binding post is mounted on a ceramic arc extinguishing cover, two ends of the ceramic arc extinguishing cover are lapped on a magnetic conductive plate, the lower part of the magnetic conductive plate is lapped on a coil, and the coil is accommodated in a U-shaped magnet yoke; a contact support penetrates through the center of the magnetic conductive plate, a contact bridge is connected to the top of the contact support, a spring seat is arranged in the middle of the contact support, the contact bridge and the spring seat are connected through a contact spring, a push rod is inserted into the center of a base of the spring seat, the bottom of the push rod sequentially penetrates through static iron and an armature, and the static iron and the armature are sequentially sleeved with a sealing sleeve. The sealing sleeve is welded with the bottom of the concentrating flux plate; according to the utility model, through the design of the integrated contact support and the push rod limiting groove, the flatness, the compact degree and the action speed of the contact in the connection and disconnection process of the product are improved while the stroke parameters of the product are ensured, and meanwhile, the insulation gasket is additionally arranged, so that the product can be reliably connected and disconnected under the conditions of high voltage and large current.

Description

Technical Field

[0001] The utility model relates to the technical field of high-voltage electrical equipment, in particular to a high-power high-voltage direct current contactor. Background Art

[0002] With the rapid development of new energy vehicle technology, high-voltage DC contactors are being used more and more widely, mainly in new energy vehicles, DC charging piles and energy storage systems to control DC high-voltage circuits.

[0003] There are generally two forms of contact structures for commonly used high-voltage DC contactors. One is that the push rod directly passes through the center hole of the contact bridge, and then the contact bridge is fixed with a gasket and an open retaining ring. The other is to fix the contact bridge by riveting the U-shaped contact bracket and the spring seat. The first fixing method has a small fixing area, which is easy to cause uneven assembly of the contact bridge. At the same time, during the up and down movement of the action mechanism, the contact bridge and the ceramic arc extinguishing cover rub, which is easy to cause the contact bridge to deflect; the second fixing method is to fix the contact bracket and the spring seat by riveting, which has relatively high requirements for riveting. The quality of riveting directly determines the flatness of the contact bridge. Uneven assembly of the contact bridge and large friction between the contact bridge and the ceramic arc extinguishing cover will directly affect the breaking speed and arc extinguishing ability of the high-voltage DC contactor.

[0004] For existing high-power and high-voltage DC contactors, the control circuit is generally controlled by a coil in combination with a PWM module. The common assembly method is to injection-mold two sets of terminal blocks on the coil skeleton, which are respectively welded to the input and output ends of the PWM module to realize coil power supply. For products with different current specifications, different coils and PWM modules need to be designed due to different structures, and the parts are not very compatible.

[0005] The utility model creatively proposes a high-power high-voltage DC contactor to solve the defects of uneven contact bridge assembly in the existing contactor contact assembly, contact bridge deflection and large friction during mechanism operation, resulting in slow DC contactor breaking speed and limited arc extinguishing ability; at the same time, through the optimized design of the coil assembly method, the defect that different coils and PWM modules need to be designed due to different structures for different current specifications and the poor adaptability of parts is solved. Utility Model Content

[0006] The purpose of the utility model is to provide a high-power high-voltage DC contactor to solve the problems raised in the above background technology.

[0007] In order to solve the above technical problems, the utility model provides the following technical solutions:

[0008] A high-power high-voltage DC contactor comprises a shell, a terminal is provided through the top of the shell, the bottom of the terminal is installed on a ceramic arc-extinguishing cover, the two ends of the ceramic arc-extinguishing cover are placed on a magnetic conductive plate, an insulating pad is provided between the two ends of the magnetic conductive plate and the ceramic arc-extinguishing cover, the lower part of the magnetic conductive plate is placed on a coil, and the coil is accommodated in a U-shaped magnetic yoke; at the same time, a contact bracket is provided through the center of the magnetic conductive plate, a contact bridge is connected to the top of the contact bracket, a spring seat is provided in the middle, the contact bridge and the spring seat are connected through a contact spring, a push rod is inserted into the center of the base of the spring seat, the bottom of the push rod passes through a static iron and an armature in turn, a flat pad is provided between the bottom of the armature and the push rod, at the same time, the static iron and the armature are inserted into a sealing sleeve in turn, and the top flange of the sealing sleeve is welded to the bottom of the magnetic conductive plate; a magnetic conductive ring is provided between the bottom of the coil and the sealing sleeve; a reaction spring is provided on the outer side of one end of the push rod inserted into the armature, and the top of the reaction spring contacts the static iron; a PWM module arranged on the side of the ceramic arc-extinguishing cover is connected to the top of the coil.

[0009] Preferably, a magnetic blow assembly is provided between the ceramic arc extinguishing hood and the shell.

[0010] Preferably, a U-shaped bracket is provided on the top of the contact bracket, the U-shaped bracket is mounted on the spring seat, a push rod is provided through the center of the spring seat, and a groove is provided at the assembly position of the push rod and the armature.

[0011] Preferably, a square hole is provided on the U-shaped side panel of the U-shaped bracket, an L-shaped connecting plate is processed on the bottom of the U-shaped side panel, three groups of circular holes arranged in a triangle are provided in the center of the L-shaped connecting plate, V-shaped arm plates are extended outward on both sides of the top of the U-shaped side panel, an arc-shaped transition section is provided at the connection between the V-shaped arm plate and the two ends of the U-shaped side panel, and a circular convex bump is provided on the outside of the V-shaped arm plate.

[0012] Preferably, a rubber ring is provided between the shell and the ceramic arc-extinguishing cover.

[0013] Preferably, a bottom plate is connected to the bottom of the shell.

[0014] Preferably, L-shaped nylon pads are provided on both sides of the insulating pad, and grooves are provided at both ends of the bottom plate of the insulating pad, and square rubber pads are embedded in the grooves.

[0015] Preferably, a square groove is opened on the inner wall of one side along the length direction of the shell, a terminal block assembly is arranged in the square groove, a group of columns are arranged on the upper and lower sides of the connection between the terminal block assembly and the inner wall of the square groove, and a seven-crank column is clamped between one side column and the inner wall of the shell.

[0016] Preferably, the terminal block assembly comprises a square PCB board, on which two groups of round holes and two groups of square holes are respectively provided, the square holes are connected to terminal blocks, the terminal blocks are connected to external leads; the round holes are connected to the input end of the PWM module via soft leads.

[0017] The working process of the utility model is:

[0018] When the utility model supplies power to both ends of the wiring terminal, the PWM module is driven, the coil is energized, a magnetic field is generated around the coil, the static iron and the armature contained in the coil are magnetized, and an electromagnetic attraction is generated. The static iron attracts the armature to move in the direction of the static iron, and the armature moves to drive the push rod to move upward, so that the entire moving contact mechanism moves in the direction of the static contact until the moving and static contacts are reliably closed, and the main circuit is connected. When power is lost at both ends of the wiring terminal, the PWM module stops working, the coil loses power, the magnetic field around the coil disappears, the moving contact mechanism and the electromagnetic mechanism move downward under the joint action of the contact spring and the reaction spring, and the moving contact is disconnected from the static contact until the armature returns to the initial position, and the main circuit is disconnected.

[0019] During the closing and disconnecting process of the main contacts, the magnetic blowing assembly plays a role in magnetic arc extinguishing, which can accelerate the extinguishing of the arc.

[0020] The utility model adopts an integrated contact bracket, and the U-shaped bracket, spring seat and push rod are connected by injection molding. The U-shaped bracket is designed with a V-shaped arm plate and a circular convex bump, which guides the contact mechanism during the product's up and down movement of closing and disconnecting, and guides the contact mechanism with friction with the inner wall of the ceramic arc extinguishing cover; the structural design of the arc-shaped transition section on the U-shaped bracket limits the contact bridge in the horizontal direction, so that it does not swing during the up and down movement. At the same time, a groove is provided at the assembly position of the push rod and the armature. When the product is assembled, a flat pad is assembled at the groove position of the push rod, and then the armature is assembled, which can improve the verticality of the assembly of the push rod and the armature, ensure the product travel parameters, reduce the friction of the entire action mechanism, and improve the product's action speed and arc extinguishing ability.

[0021] A rubber ring is provided between the housing and the ceramic arc extinguishing cover, and the rubber ring acts as a buffer connection. The bottom of the housing is connected to a base plate, so that the entire mechanism is wrapped by a nylon shell, making the product safer to use. The housing is provided with a wiring board assembly structure, and the coil terminal and the PWM module input terminal are welded on the PCB board, and then the PCB board and the housing are clamped. This assembly method improves the compatibility of the coil and the PWM module, and improves the safety and reliability of the product.

[0022] An insulating gasket is installed inside the ceramic arc extinguishing hood between the contact and the magnetic plate to effectively prevent the arc from spraying onto the magnetic plate during the high voltage and high current load switching process of the DC contactor and causing product short circuit problems. The design of the rubber pad at the bottom of the nylon gasket makes the insulating gasket and the contact system more compact.

[0023] The beneficial effects of the utility model are:

[0024] (1) The utility model improves the flatness, compactness and movement speed of the contacts during the connection and disconnection process while ensuring the product stroke parameters through the design of an integrated contact bracket and a push rod limit groove. At the same time, with the addition of an insulating gasket, the product can achieve reliable connection and disconnection under high voltage and high current conditions. The external lead terminal is connected to the PWM module through a PCB board and then clamped to the shell, which improves the compatibility of the coil and the PWM module, and improves the safety and reliability of the product.

[0025] (2) The contact bracket in the utility model is formed into an integrated contact bracket by injection molding of a U-shaped bracket, a spring seat, and a push rod, ensuring that the contact is flat and reliable during the connection and disconnection process. The U-shaped bracket extends two pairs of V-shaped arm plates along the length direction of the contact bridge. The two pairs of V-shaped arm plates are bent outward respectively, and a circular bulge is punched out near the center of the edge of the V-shaped arm plate. During the up and down movement of the actuating mechanism, the U-shaped bracket and the ceramic arc-extinguishing cover are guided by four small bulges, which changes the previous guiding method of the contact bridge and the ceramic arc-extinguishing cover to prevent the contact bridge from tilting. At the same time, the bending root position of the V-shaped arm plate is bent inward near the side of the contact bridge to form four columnar bulges, which limit the contact bridge in the horizontal direction to prevent it from swinging; a rectangular hole is opened on each of the two large sides of the U-shaped bracket to reduce the weight of the contact bracket; two platforms are formed at the bottom and the spring seat injection position, and three circular holes are opened at the three vertices in the middle position in a triangular style, which can prevent the U-shaped bracket from being pulled out of the nylon spring seat during the up and down opening and closing movement of the entire contact, thereby improving the product's action reliability and opening and closing speed.

[0026] (3) In the utility model, a limit groove is provided at the assembly position of the push rod and the armature, which can limit the assembly position of the armature, ensure the product stroke parameters, improve the verticality of the push rod and the armature assembly, reduce the friction of the entire action mechanism, and improve the product action speed and reliability.

[0027] (4) The utility model installs an insulating gasket inside the ceramic arc extinguishing cover, between the contact and the magnetic plate, to effectively prevent the arc from spraying onto the magnetic plate during the high voltage and high current load switching process of the DC contactor and causing product short circuit problems. The design of the rubber part at the bottom of the insulating gasket makes the matching of the insulating gasket and the contact system more compact.

[0028] (5) The utility model uses a method of assembling the external lead terminal and the PWM module by connecting them through a PCB board and then clamping them to the housing, which improves assembly reliability and the compatibility of the coil and the PWM module. That is, for high-power DC contactors of different specifications, the coil and PWM module can be universal, and only the connection circuit board and the clamping structure need to be adjusted and designed, thereby improving the adaptability of the parts. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the structure of the utility model;

[0030] Figure 2 It is a schematic diagram of the side section structure of the utility model;

[0031] Figure 3 This is a schematic diagram of the structure of the integrated contact bracket of the utility model;

[0032] Figure 4 This is a schematic diagram of the U-shaped bracket structure of the utility model;

[0033] Figure 5 This is a cross-sectional view of the contact structure of the utility model;

[0034] Figure 6 This is a schematic diagram of the structure of the insulating pad of the utility model;

[0035] Figure 7 This is a schematic diagram of the structure of the housing assembly of the utility model;

[0036] Figure 8 This is a schematic diagram of the structure of the wiring board assembly of the utility model;

[0037] In the figure: 1. Terminal, 2. Ceramic arc extinguishing cover, 3. Contact bridge, 4. Contact support, 5. Contact spring, 6. Insulating gasket, 601. Nylon gasket, 602. Rubber pad, 7. Magnetic plate, 8. Static iron, 9. Push rod, 901. Groove, 10. Reaction spring, 11. Shell, 111. Square groove, 112. Pillar, 113. Seven-shaped crooked pillar, 12. Rubber ring, 13. Magnetic blowing assembly, 14. Coil, 15. Sealing sleeve, 16. Armature, 17. Magnetic ring, 18. Flat pad, 19. U-shaped yoke, 20. Bottom plate, 21. PWM module, 22. U-shaped bracket, 221. V-shaped arm plate, 222. Circular convex hull, 223. Arc-shaped transition section, 224. Square hole, 225. L-shaped connecting plate, 226. Round hole, 23. Spring seat, 24. Terminal block assembly, 241. Terminal block, 242. PCB board. DETAILED DESCRIPTION

[0038] The utility model is further described in detail below in conjunction with the accompanying drawings.

[0039] like Figure 1-8A high-power high-voltage DC contactor is shown, comprising a magnetic blow assembly 13, a terminal 1, a ceramic arc-extinguishing cover 2, and a contact bridge 3. The contact bridge 1 and the contact spring 5 are mounted on a contact bracket 4, and the convex bulge of the contact bridge 3 and the convex bulge of the spring seat 23 limit the contact spring 5. The insulating gasket 6 is mounted below the ceramic arc-extinguishing cover 2 and above the magnetic conductive plate 7. The contact bracket 4 is mounted at the center of the insulating gasket 6. The lower end of the push rod 9 passes through the inner hole of the static iron 8. The outer side of the push rod 9 is equipped with a reaction spring 10, a flat washer 18, an armature 16, and a sealing sleeve 15. The sealing sleeve 15 passes through the inner hole of the coil 14 and is assembled and riveted with a U-shaped magnetic yoke 19 and a magnetic conductive ring 17. The inlet and outlet positions of the coil 14 are welded to the output end of the PWM module 21. The input end of the PWM module 21 is connected to the external lead terminal 241 through a PCB board 242. The PCB board 242 and the entire contact system, the magnetic blow assembly 13, and the electromagnetic system are mounted inside the housing 11, and the bottom is fixed with a base plate 20.

[0040] The contact bracket 4 is formed into one piece by injection molding of a U-shaped bracket 22, a spring seat 23, and a push rod 9. The U-shaped bracket 22 fixes the contact bridge 3. The U-shaped bracket 22 extends two pairs of V-shaped arm plates 221 along the length direction of the contact bridge. The two pairs of V-shaped arm plates 221 are bent outward respectively. A circular convex bulge 222 is punched out of the V-shaped arm plates near the center of the edge. During the up and down movement of the action mechanism, the U-shaped bracket 22 and the ceramic arc-extinguishing cover 2 are guided by four small convex bulges 222; the V-shaped arm plates 221 are bent inward at the root position near the contact bridge 3 to form four arc-shaped transition sections 223 to limit the contact bridge 3 in the horizontal direction; a square hole 224 is opened on each of the two large sides of the U-shaped bracket 22, and two L-shaped connecting plates 225 are formed at the bottom and the injection molding position of the spring seat 23, and three circular holes 226 are opened at the three vertices in the middle position in a triangular style.

[0041] The push rod 9 is injection molded at the center position of the spring seat 23. A circle of groove 901 is opened in the radial direction of the push rod 9 at the assembly position of the push rod 9 and the armature 16. The lower end of the groove 901 is tapped with a thread. When assembling, a flat washer 18 is first installed in the groove position, and then the armature 16 is assembled to the push rod 9.

[0042] On the inner side of the ceramic arc extinguishing cover 2, an insulating gasket 6 is installed between the contact and the magnetic conductive plate 7. The insulating gasket 6 consists of a nylon gasket 601 and a rubber part 602. Two square grooves are opened at the bottom of the nylon gasket 601, and two small round protrusions rise in the grooves. The rubber part 602 is square, and its shape matches the square groove of the nylon gasket 601. Two holes are opened at corresponding positions in the center. The thickness of the rubber part 602 is greater than the depth of the groove of the nylon gasket 601. The rubber part 602 and the nylon gasket 601 are interference fit in the vertical direction, so that the entire insulating gasket 6 is compactly assembled in the contact system and can play an arc-isolating role.

[0043] The input and output wires of the coil 14 are connected to the output end of the PWM module 21 through a soft wire, the input end of the PWM module 21 is welded to the two round holes of the PCB board 242 through a soft wire, the external lead terminal 241 is welded to the two square holes of the PCB board 242, and the welded terminal block assembly 24 is clamped into the square groove 111 of the shell 11. Four pillars 112 rise in the groove to limit the front and rear directions and the left and right directions of the PCB board 242. The front and rear direction spacing is equivalent to the thickness of the PCB board 242, forming an interference fit, and the left and right direction spacing is equivalent to the length of the PCB board 242, forming a clearance fit. At the same time, a seven-shaped pillar 113 rises in the square groove 111 of the shell to limit the terminal 241 in the front and rear directions and the left and right directions.

[0044] The working process of the utility model is as follows:

[0045] When the utility model supplies power to both ends of the connection terminal 241, the PWM module 21 is driven, the coil 14 is powered, a magnetic field is generated around the coil 14, the static iron 8 and the armature 16 contained in the coil 14 are magnetized, and an electromagnetic attraction is generated, the static iron 8 attracts the armature 16 to move in the direction of the static iron 8, and the armature 16 drives the push rod 9 to move upward when it moves, so that the entire moving contact mechanism moves in the direction of the static contact until the moving and static contacts are reliably closed, and the main circuit is connected. When the power is lost at both ends of the connection terminal 241, the PWM module 21 stops working, the coil 14 loses power, and the magnetic field around the coil 14 disappears. The moving contact mechanism and the electromagnetic mechanism move downward under the joint action of the contact spring 5 and the reaction spring 10, and the moving contact is disconnected from the static contact until the armature returns to the initial position, and the main circuit is disconnected.

[0046] The utility model improves the flatness, compactness and movement speed of the contacts during the connection and disconnection process while ensuring the product stroke parameters through the design of an integrated contact bracket and a push rod limit groove; an insulating pad is added to the contact system to effectively insulate and isolate the contacts from the magnetic conductive plate when the product is connected and disconnected under load under high voltage and high current conditions, thereby achieving reliable connection and disconnection; the coil terminal is connected to the PCB board and then clamped to the shell, which improves the compatibility of the coil with the PWM module and improves the product safety and reliability.

[0047] The above are only preferred examples of the present invention. It should be pointed out that for ordinary technicians in this field, under the technical inspiration provided by the present invention, as common knowledge in the electrical field, other equivalent variations and improvements can be made, which should also be regarded as the protection scope of the present invention.

Claims

1. A high-power high-voltage DC contactor, characterized in that: The invention comprises a housing (11), wherein a terminal (1) is provided through the top of the housing (11), the bottom of the terminal (1) is mounted on a ceramic arc extinguishing cover (2), the two ends of the ceramic arc extinguishing cover (2) are mounted on a magnetic conductive plate (7), an insulating pad (6) is provided between the two ends of the magnetic conductive plate (7) and the ceramic arc extinguishing cover (2), the bottom of the magnetic conductive plate (7) is mounted on a coil (14), and the coil (14) is accommodated in a U-shaped magnetic yoke (19); at the same time, a contact support (4) is provided through the center of the magnetic conductive plate (7), the top of the contact support (4) is connected to a contact bridge (3), a spring seat (23) is provided in the middle, the contact bridge (3) and the spring seat (23) are connected via a contact spring (5), and the bottom of the spring seat (23) is provided with a spring seat (23). A push rod (9) is inserted into the center of the seat, and the bottom of the push rod (9) passes through the static iron (8) and the armature (16) in sequence. A flat washer (18) is provided between the bottom of the armature (16) and the push rod (9). At the same time, the static iron (8) and the armature (16) are inserted into the sealing sleeve (15) in sequence, and the top flange of the sealing sleeve (15) is welded to the bottom of the magnetic plate (7); a magnetic ring (17) is provided between the bottom of the coil (14) and the sealing sleeve (15); a reaction spring (10) is provided on the outer side of one end of the push rod (9) inserted into the armature (16), and the top of the reaction spring (10) is in contact with the static iron (8); and the top of the coil (14) is connected to a PWM module (21) arranged on the side of the ceramic arc extinguishing cover (2).

2. A high-power high-voltage DC contactor according to claim 1, characterized in that: A magnetic blowout assembly (13) is provided between the ceramic arc extinguishing hood (2) and the housing (11).

3. A high-power high-voltage DC contactor according to claim 1 or 2, characterized in that: A U-shaped bracket (22) is provided on the top of the contact bracket (4), the U-shaped bracket (22) is mounted on a spring seat (23), a push rod (9) is provided through the center of the spring seat (23), and a groove (901) is provided at the assembly position of the push rod (9) and the armature (16).

4. A high-power high-voltage DC contactor according to claim 3, characterized in that: The U-shaped side plate of the U-shaped bracket (22) is provided with a square hole (224), the bottom of the U-shaped side plate is processed with an L-shaped connecting plate (225), the center of the L-shaped connecting plate (225) is provided with three groups of triangularly arranged circular holes (226), the top two sides of the U-shaped side plate are provided with V-shaped arm plates (221) extending outwards, the connection between the V-shaped arm plate (221) and the two ends of the U-shaped side plate is provided with an arc-shaped transition section (223), and the outer side of the V-shaped arm plate (221) is provided with a circular convex bulge (222).

5. A high-power high-voltage DC contactor according to claim 4, characterized in that: A rubber ring (12) is provided between the housing (11) and the ceramic arc-extinguishing cover (2).

6. A high-power high-voltage DC contactor according to claim 5, characterized in that: The bottom of the housing (11) is connected to a bottom plate (20).

7. A high-power high-voltage DC contactor according to claim 6, characterized in that: L-shaped nylon pads (601) are provided on both sides of the insulating pad (6), and grooves are provided at both ends of the bottom plate of the insulating pad (6), in which square rubber pads (602) are embedded.

8. A high-power high-voltage DC contactor according to claim 7, characterized in that: A square groove (111) is provided on one inner wall of the housing (11) along the length direction, a wiring board assembly (24) is provided in the square groove (111), a group of pillars (112) are provided on the upper and lower sides of the connection between the wiring board assembly (24) and the inner wall of the square groove (111), and a seven-pin crooked pillar (113) is clamped between one side pillar (112) and the inner wall of the housing (11).

9. A high-power high-voltage DC contactor according to claim 8, characterized in that: The wiring board assembly (24) comprises a square PCB board (242), the PCB board (242) being provided with two groups of round holes and two groups of square holes, the square holes being connected to wiring terminals (241), the wiring terminals (241) being connected to external leads; the round holes are connected to the input end of the PWM module (21) via soft leads.

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