Multi-loop high-voltage direct-current contactor with novel structure

Abstract

The invention discloses a multi-loop high-voltage direct-current contactor with a novel structure. The multi-loop high-voltage direct-current contactor structurally comprises a ceramic arc extinguishing cover, a lower contact loop, an upper contact loop, an auxiliary contact loop, an insulating sleeve and a coil assembly, an independent auxiliary contact loop is arranged in addition to two main loops including an upper electric shock loop and a lower electric shock loop. When the product is electrified, the two main loops are conducted, and the auxiliary contact loops are switched at the same time; when the product is powered off, the two main loops and the auxiliary contact loop can be switched at the same time; the requirements of a customer for switching a double-loop high-power load and simultaneously switching different low-power loads by using an auxiliary contact loop can be met; or the two main loops switch different power loads, and one group of auxiliary contact loops detect the working states of the main loops, so that the safety of maintenance personnel is realized when the main loops are in a high-voltage state, and the requirements of customers under various working conditions are met.

Description

Technical Field

[0001] The present invention relates to the technical field of DC contactors, and more particularly to a multi-loop high-voltage DC contactor with a novel structure. Background Art

[0002] The high-voltage DC contactors currently used in the electric vehicle industry generally have a single-current main circuit; with the popularization of the intelligence and diversification in the electric vehicle industry, the requirements for high-voltage DC contactors are getting higher and higher, not only limited to the requirements of a double-loop, but some customers have put forward requirements for multi-loops. Some existing customers require that in the product, a double-current main circuit be configured to simultaneously switch two current load circuits. At the same time, in order to monitor the on-state of the product, an auxiliary contact circuit is additionally configured to monitor the state of the main contact circuit. When the main circuit is conducting, the auxiliary contact circuit conducts synchronously; conversely, when the main circuit is disconnected, the auxiliary contact circuit disconnects synchronously. In order to meet the diverse requirements of the market, the product needs to implement a structure with a double main circuit and an auxiliary contact circuit.

[0003] In summary, there is an urgent need for a multi-loop high-voltage DC contactor with a novel structure to solve the above problems. Summary of the Invention

[0004] Aiming at the deficiencies of the prior art, the present invention provides a multi-loop high-voltage DC contactor with a novel structure, which solves the problem that a single high-voltage DC contactor has a structure with a double main circuit and an auxiliary contact circuit to realize the configuration of a double-current main circuit, simultaneously switch two current load circuits, and at the same time configure an auxiliary contact circuit to monitor the state of the main contact circuit. The many technical effects that can be produced by the preferred technical solutions among the many technical solutions provided by the present invention are described in detail below.

[0005] The present invention provides a multi-loop high-voltage DC contactor with a novel structure, including a ceramic arc extinguishing cover, a lower contact circuit, an upper contact circuit, an auxiliary contact circuit, an insulating sleeve and a coil assembly; the upper contact circuit, the lower contact circuit and the auxiliary contact circuit are arranged inside the ceramic arc extinguishing cover; the upper contact circuit, the lower contact circuit and the auxiliary contact circuit are installed on the insulating sleeve, the bottom of the insulating sleeve is connected to the coil assembly, the upper contact circuit is arranged above the lower contact circuit, and the auxiliary contact circuit is arranged above the upper contact circuit.

[0006] The auxiliary contact circuit includes an auxiliary conductive post, a transition piece, and an auxiliary moving reed. The auxiliary conductive post is movably installed at the top of the ceramic arc extinguishing cover, extending from above the ceramic arc extinguishing cover into the interior of the ceramic arc extinguishing cover. A transition piece is fixedly installed at one end of the auxiliary conductive post away from the ceramic arc extinguishing cover. One end of the auxiliary conductive post away from the transition piece is fixedly connected to the auxiliary moving reed, and the auxiliary moving reed is fixedly installed above the insulating sleeve.

[0007] A yoke is fixedly installed below the coil assembly. A yoke iron plate is fixedly installed at the top of the yoke. A square piece is fixedly installed above the yoke iron plate. The ceramic arc extinguishing cover is fixedly installed above the square piece.

[0008] The ceramic arc extinguishing cover includes a first arc extinguishing cover and a second arc extinguishing cover. The first arc extinguishing cover is arranged above the second arc extinguishing cover. The upper contact circuit is arranged inside the first arc extinguishing cover. The upper contact circuit includes an upper contact spring, an upper moving contact piece, and an upper moving contact conductive post. An upper moving contact piece boss is arranged at the bottom of the upper moving contact piece. The upper moving contact conductive post is arranged above both ends of the upper moving contact piece and is fixedly installed above the top of the first arc extinguishing cover.

[0009] The lower contact circuit is arranged inside the second arc extinguishing cover. The lower contact circuit includes a lower contact spring, a lower moving contact piece, and a lower moving contact conductive post. A lower moving contact piece boss is arranged at the bottom of the lower moving contact piece. The lower moving contact conductive post is arranged above both ends of the lower moving contact piece and is fixedly installed above both ends in the length direction of the second arc extinguishing cover.

[0010] An auxiliary moving reed is fixedly installed above the top of the insulating sleeve. A first through groove and a second through groove are arranged above the insulating sleeve. The first through groove is arranged above the second through groove. A first positioning boss is arranged below the first through groove. A second positioning boss is arranged below the second through groove. A fixed seat is fixedly installed below the insulating sleeve.

[0011] The upper contact spring is fixedly installed above the first positioning boss and is arranged inside the first through groove. The upper moving contact piece boss is correspondingly arranged with the first positioning boss, and the upper moving contact piece is inserted into the first through groove.

[0012] The lower contact spring is fixedly installed above the second positioning boss and is arranged inside the second through groove. The lower moving contact piece boss is correspondingly arranged with the second positioning boss, and the lower moving contact piece is inserted into the second through groove.

[0013] A second magnet holder is fixedly installed on the outer wall of the first arc extinguishing cover, and a first magnet holder is fixedly installed on the outer wall of the second arc extinguishing cover. The second magnet holder and the first magnet holder are in a "C" structure, and the opening directions of the "C" structures of the second magnet holder and the first magnet holder are opposite to each other; the side wall in the length direction of the second magnet holder is attached to the outer wall of the first arc extinguishing cover; the side wall in the length direction of the first magnet holder is attached to the outer wall of the second arc extinguishing cover; second magnetic blocks are installed between the inner walls at both ends in the length direction of the "C" structure of the second magnet holder and the outer wall of the first arc extinguishing cover, and the second magnetic blocks are embedded into the first arc extinguishing cover; first magnetic blocks are installed between the inner walls at both ends in the length direction of the "C" structure of the first magnet holder and the outer wall of the second arc extinguishing cover, and the first magnetic blocks are embedded into the second arc extinguishing cover; A vertical upper positioning rib is fixedly installed inside the first arc extinguishing cover, and a vertical lower positioning rib is fixedly installed inside the second arc extinguishing cover; The four corners of the first arc extinguishing cover are set as upper arc extinguishing corners; the four corners of the second arc extinguishing cover are set as lower arc extinguishing corners; The coil assembly includes a metal shell, a winding, a magnetic conduction cylinder, a push rod, a moving iron core, a return spring and a coil holder; the push rod is fixedly installed below the insulating sleeve, a moving iron core is fixedly installed on the outer wall of the push rod, and a return spring is installed between the moving iron core and the yoke iron plate; a metal shell is fixedly installed on the outer wall of the moving iron core; a magnetic conduction cylinder is fixedly installed on the outer wall of the metal shell, a coil holder is fixedly installed on the outer wall of the magnetic conduction cylinder, and a winding is fixedly installed inside the coil holder.

[0014] As a preferred solution of the present invention, the two sides of the first magnetic block and the second magnetic block are provided with the words "N" and "S".

[0015] As a preferred solution of the present invention, a semi-circular notch is provided below the first magnetic block and the second magnetic block.

[0016] As a preferred solution of the present invention, the auxiliary moving reed is set in an inverted "J" shape, and there are two symmetrically arranged cap-shaped arcs and a cap brim shape in its length direction, and a middle notch is provided between the cap-shaped arcs and the cap brim shape at one end, and it is processed by a high-elastic alloy material.

[0017] As a preferred solution of the present invention, an inflation pipe is fixedly installed below the yoke iron plate, and the inflation pipe extends into the ceramic arc extinguishing cover.

[0018] As a preferred solution of the present invention, the ceramic arc extinguishing cover is designed into an upper and lower double-door structure.

[0019] Compared with the prior art, the technical solution of the present application has the following beneficial effects: 1. The high-voltage contactor with a novel structure shown in the present invention, in addition to two main circuits with an upper contact circuit and a lower contact circuit, also constructs an independent auxiliary contact circuit. When the product is powered on, both main circuits are conducted, and at the same time the auxiliary contact circuit is switched; when the product is powered off, the two main circuits can be switched, and the auxiliary contact circuit is switched at the same time; it can meet the requirements of customers to switch double-circuit high-power loads and at the same time switch different low-power loads with the auxiliary contact circuit; or the two main circuits switch different power loads, and a group of auxiliary contact circuits detect the working state of the main circuit, ensuring the safety of maintenance personnel when the main circuit is in a high-voltage state and meeting the needs of customers under various working conditions.

[0020] 2. The high-voltage contactor with a novel structure shown in the present invention is such that when multiple circuits of this product work, the directions of the arcs generated by the load current are staggered and do not affect each other; at the same time, the ceramic arc extinguishing cover is designed in an upper and lower double-door structure, so that the two main circuits of the upper contact circuit and the lower contact circuit are arranged in a staggered manner, and the auxiliary moving reed is installed above the insulating sleeve, forming mutual isolation and insulation among the three circuits of the two main circuits arranged in a staggered manner and the auxiliary contact circuit, which is convenient for the heat dissipation and insulation of the load.

[0021] 3. The high-voltage contactor with a novel structure shown in the present invention is such that the auxiliary moving reed is set in an inverted "J" shape, with two hat-shaped arcs and a hat brim shape that are symmetric left and right in the length direction, and there is an intermediate notch between the hat-shaped arc and the hat brim shape at one end. It is processed with a high-elastic alloy material and has a stable stress point and reliable contact; the auxiliary moving reed is installed above the insulating sleeve and is above the upper contact circuit and the lower contact circuit, which can isolate the ablation and coverage of the auxiliary contact circuit by the arcs, metal droplets, etc. generated by the high-power main circuit, and ensure the insulation of the auxiliary contact circuit.

[0022] 4. The high-voltage contactor with the novel structure shown in the present invention is provided with a second magnet holder fixedly installed on the outer wall of the first arc extinguishing cover, and a first magnet holder fixedly installed on the outer wall of the second arc extinguishing cover. The second magnet holder and the first magnet holder are in a "C" structure; the side wall in the length direction of the second magnet holder is attached to the outer wall of the first arc extinguishing cover; the side wall in the length direction of the first magnet holder is attached to the outer wall of the second arc extinguishing cover; second magnetic blocks are installed between the inner walls at both ends in the length direction of the "C" structure of the second magnet holder and the outer wall of the first arc extinguishing cover; first magnetic blocks are installed between the inner walls at both ends in the length direction of the "C" structure of the first magnet holder and the outer wall of the second arc extinguishing cover; two second magnetic blocks with the same magnetic field direction and the second magnet holder are assembled outside the first arc extinguishing cover, and the magnets processed from rare earth permanent magnetic materials form a stable external magnetic field in the first arc extinguishing cover. The magnetic field is strong in the internal contact area of the upper moving contact conducting column, which can greatly improve the arc extinguishing effect and enhance the product performance. At the same time, two first magnetic blocks with the same magnetic field direction and the first magnet holder are assembled outside the second arc extinguishing cover, and the magnets processed from rare earth permanent magnetic materials form a stable external magnetic field in the second arc extinguishing cover. The magnetic field is strong in the internal contact area of the lower moving contact conducting column, which can greatly improve the arc extinguishing effect and enhance the product performance. The opening directions of the "C" structures of the second magnet holder and the first magnet holder are opposite to each other, avoiding the mutual interference of the upper and lower magnetic fields.

[0023] 5. The high-voltage contactor with the novel structure shown in the present invention is provided with the words "N" and "S" on both sides of the first magnetic block and the second magnetic block to confirm the positive and negative poles; at the same time, a semi-circular notch is provided below the first magnetic block and the second magnetic block to assist the user in installation, improve the installation efficiency, and ensure the installation accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a three-dimensional structural schematic diagram of a multi-circuit high-voltage DC contactor with a novel structure of the present invention; Figure 2 is a front-view structural schematic diagram of a multi-circuit high-voltage DC contactor with a novel structure of the present invention; Figure 3 is Figure 2 a sectional structural schematic diagram at A-A above; Figure 4 is a right-view structural schematic diagram of a multi-circuit high-voltage DC contactor with a novel structure of the present invention; Figure 5 is Figure 4 a sectional structural schematic diagram at B-B above; Figure 6 is a front-view structural schematic diagram of an insulating sleeve and an auxiliary moving reed in a multi-circuit high-voltage DC contactor with a novel structure of the present invention; Figure 7Front view structural schematic diagram of the first magnetic block in a multi-loop high-voltage DC contactor with a novel structure according to the present invention; Figure 8 Rear view structural schematic diagram of the first magnetic block of a multi-loop high-voltage DC contactor with a novel structure according to the present invention; Figure 9 Top view structural schematic diagram of a multi-loop high-voltage DC contactor with a novel structure according to the present invention; Figure 10 Schematic diagram of the usage state of the first embodiment of a multi-loop high-voltage DC contactor with a novel structure according to the present invention; Figure 11 Schematic diagram of the usage state of the second embodiment of a multi-loop high-voltage DC contactor with a novel structure according to the present invention; Figure 12 Schematic diagram of the connection state of the lower contact loop, the upper contact loop and the insulating sleeve in a multi-loop high-voltage DC contactor with a novel structure according to the present invention.

[0025] In the figure: 1, ceramic arc extinguishing cover; 101, first arc extinguishing cover; 102, second arc extinguishing cover; 103, lower positioning rib; 104, upper positioning rib; 105, upper arc extinguishing angle; 106, lower arc extinguishing angle; 2, lower contact loop; 201, lower contact spring; 202, lower moving contact piece; 2021, lower moving contact piece boss; 203, lower moving contact conductive column; 3, upper contact loop; 301, upper contact spring; 302, upper moving contact piece; 3021, upper moving contact piece boss; 303, upper moving contact conductive column; 4, auxiliary contact loop; 401, auxiliary conductive column; 402, transition piece; 403, auxiliary moving spring piece; 4031, cap-shaped arc; 4032, cap-edge shape; 5, coil assembly; 501, metal shell; 502, winding; 503, magnetic conduction cylinder; 504, push rod; 505, moving iron core; 506, return spring; 507, coil holder; 6, first magnet holder; 7, second magnet holder; 8, square piece; 9, magnetic yoke; 10, first magnetic block; 1001, semi-circular notch; 11, second magnetic block; 12, yoke iron plate; 13, gas filling pipe; 14, insulating sleeve; 1401, first positioning boss; 1402, second positioning boss; 1403, fixed seat; 1404, first through groove; 1405, second through groove. Detailed implementation manners

[0026] It should be noted first that in different described embodiments, the same components are provided with the same reference numerals or the same component names. Among them, the disclosed content included in the entire specification can be transferred meaningfully to the same components with the same reference numerals or the same component names. The positional descriptions selected in the specification, such as up, down, lateral, etc., also refer to the directly described and illustrated drawings and are transferred meaningfully to the new positions when the positions change.

[0027] Embodiment 1:

[0028] A multi-circuit high-voltage DC contactor with a new structure, as Figures 1-10 , Figure 12 shown, includes a ceramic arc extinguishing cover 1, a lower contact circuit 2, an upper contact circuit 3, an auxiliary contact circuit 4, an insulating sleeve 14 and a coil assembly 5; The technical effect of the present invention is that: outside the two main circuits provided with the upper contact circuit 3 and the lower contact circuit 2, an independent auxiliary contact circuit 4 is configured at the same time; and it is necessary to meet different requirements of customers: when the product is powered on, both main circuits are turned on, and at the same time the auxiliary contact circuit 4 is switched at the same time; when the product is powered off, the two main circuits can be switched, and the auxiliary contact circuit 4 is switched at the same time; it can meet the requirements of customers to switch double-circuit high-power loads and at the same time use the auxiliary contact circuit 4 to switch different low-power loads; or the two main circuits switch different power loads, and a group of auxiliary contact circuits 4 detect the working state of the main circuit to ensure the safety of maintenance personnel when the main circuit is in a high-voltage state; when multiple circuits of this product work, the arc directions generated by the load current are staggered and will not affect each other.

[0029] As Figure 5 shown, the upper contact circuit 3, the lower contact circuit 2 and the auxiliary contact circuit 4 are arranged inside the ceramic arc extinguishing cover 1; the upper contact circuit 3, the lower contact circuit 2 and the auxiliary contact circuit 4 are installed on the insulating sleeve 14, the bottom of the insulating sleeve 14 is connected to the coil assembly 5, the upper contact circuit 3 is arranged above the lower contact circuit 2, and the auxiliary contact circuit 4 is arranged above the upper contact circuit 3; As Figure 3 shown, the auxiliary contact circuit 4 is provided with an auxiliary conductive column 401, a transition piece 402 and an auxiliary moving reed 403. The auxiliary conductive column 401 is movably installed on the top of the ceramic arc extinguishing cover 1, extends from above the ceramic arc extinguishing cover 1 to the inside of the ceramic arc extinguishing cover 1, and a transition piece 402 is fixedly installed at one end of the auxiliary conductive column 401 away from the ceramic arc extinguishing cover 1; one end of the auxiliary conductive column 401 away from the transition piece 402 is fixedly connected to the auxiliary moving reed 403, and the auxiliary moving reed 403 is fixedly installed above the insulating sleeve 14; the auxiliary moving reed 403 is set in an inverted "r" shape, and there are two symmetrically arranged cap-shaped arcs 4031 and a cap-edge shape 4032 in its length direction, and there is a middle gap between the cap-shaped arc 4031 and the cap-edge shape 4032 at one end. It is processed by a high-elastic alloy material and has a stable stress point and reliable contact; the auxiliary moving reed 403 is installed above the insulating sleeve 14 and is above the upper contact circuit 3 and the lower contact circuit 2, which can isolate the arc, metal droplets, etc. generated by the high-power main circuit from eroding and covering the auxiliary contact circuit 4, and ensure the insulation of the auxiliary contact circuit 4.

[0030] As Figure 2 shown, a yoke 9 is fixedly installed below the coil assembly 5, a yoke iron plate 12 is fixedly installed on the top of the yoke 9, a square plate 8 is fixedly installed above the yoke iron plate 12, and the ceramic arc extinguishing cover 1 is fixedly installed above the square plate 8.

[0031] As Figure 5 shown, the ceramic arc extinguishing cover 1 is designed into an upper and lower double-door structure. The upper structure is the first arc extinguishing cover 101; the lower structure is the second arc extinguishing cover 102; the first arc extinguishing cover 101 is arranged above the second arc extinguishing cover 102; so that the two main circuits of the upper contact circuit 3 and the lower contact circuit 2 are arranged staggeredly. The auxiliary moving reed 403 is installed above the insulating sleeve 14, so that mutual isolation is formed among the three circuits of the staggered arrangement of the two main circuits and the auxiliary contact circuit 4, which is convenient for heat dissipation and insulation of the load.

[0032] As Figures 4-5 shown, the upper contact circuit 3 is arranged inside the first arc extinguishing cover 101. The upper contact circuit 3 is provided with an upper contact spring 301, an upper moving contact piece 302 and an upper moving contact conducting column 303; a convex platform 3021 of the upper moving contact piece is arranged at the bottom of the upper moving contact piece 302; the upper moving contact conducting column 303 is arranged above both ends of the upper moving contact piece 302 and is fixedly installed above the top of the first arc extinguishing cover 101.

[0033] As Figures 4-5 shown, the lower contact circuit 2 is arranged inside the second arc extinguishing cover 102. The lower contact circuit 2 is provided with a lower contact spring 201, a lower moving contact piece 202 and a lower moving contact conducting column 203; a convex platform 2021 of the lower moving contact piece is arranged at the bottom of the lower moving contact piece 202; the lower moving contact conducting column 203 is arranged above both ends of the lower moving contact piece 202 and is fixedly installed above both ends in the length direction of the second arc extinguishing cover 102.

[0034] As Figure 6 shown, an auxiliary moving reed 403 is fixedly installed above the top of the insulating sleeve 14; a first through groove 1404 and a second through groove 1405 are arranged above the insulating sleeve 14, and the first through groove 1404 is arranged above the second through groove 1405; a first positioning convex platform 1401 is arranged below the first through groove 1404; a second positioning convex platform 1402 is arranged below the second through groove 1405; a fixing seat 1403 is fixedly installed below the insulating sleeve 14.

[0035] As Figure 12As shown, the upper contact spring 301 is fixedly installed above the first positioning boss 1401 and is arranged inside the first through groove 1404. The upper moving contact piece boss 3021 is arranged corresponding to the first positioning boss 1401. The upper moving contact piece 302 is inserted into the first through groove 1404, further improving the assembly effect.

[0036] As Figure 12 shown, the lower contact spring 201 is fixedly installed above the second positioning boss 1402 and is arranged inside the second through groove 1405. The lower moving contact piece boss 2021 is arranged corresponding to the second positioning boss 1402. The lower moving contact piece 202 is inserted into the second through groove 1405, further improving the assembly effect.

[0037] To achieve a better arc extinguishing effect, as Figure 9 shown, a second magnet holder 7 is fixedly installed on the outer wall of the first arc extinguishing cover 101, and a first magnet holder 6 is fixedly installed on the outer wall of the second arc extinguishing cover 102. The second magnet holder 7 and the first magnet holder 6 are in a "C" structure, and the opening directions of the "C" structures of the second magnet holder 7 and the first magnet holder 6 are opposite to each other; the side wall in the length direction of the second magnet holder 7 is attached to the outer wall of the first arc extinguishing cover 101; the side wall in the length direction of the first magnet holder 6 is attached to the outer wall of the second arc extinguishing cover 102; second magnetic blocks 11 are installed between the inner walls at both ends in the length direction of the "C" structure of the second magnet holder 7 and the outer wall of the first arc extinguishing cover 101, and the second magnetic blocks 11 are embedded into the first arc extinguishing cover 101; first magnetic blocks 10 are installed between the inner walls at both ends in the length direction of the "C" structure of the first magnet holder 6 and the outer wall of the second arc extinguishing cover 102, and the first magnetic blocks 10 are embedded into the second arc extinguishing cover 102; Two second magnetic blocks 11 with the same magnetic field direction and the second magnet holder 7 are assembled outside the first arc extinguishing cover 101. The magnets processed from rare earth permanent magnetic materials form a stable external magnetic field in the first arc extinguishing cover 101. The magnetic field is strong in the internal contact area of the upper moving contact conductive column 303, which can greatly improve the arc extinguishing effect and enhance the product performance. At the same time, two first magnetic blocks 10 with the same magnetic field direction and the first magnet holder 6 are assembled outside the second arc extinguishing cover 102. The magnets processed from rare earth permanent magnetic materials form a stable external magnetic field in the second arc extinguishing cover 102. The magnetic field is strong in the internal contact area of the lower moving contact conductive column 203, which can greatly improve the arc extinguishing effect and enhance the product performance. The opening directions of the "C" structures of the second magnet holder 7 and the first magnet holder 6 are opposite to each other, avoiding the mutual interference of the upper and lower magnetic fields.

[0038] As Figure 10As shown, a vertical upper positioning rib 104 is fixedly installed inside the first arc extinguishing cover 101, and a vertical lower positioning rib 103 is fixedly installed inside the second arc extinguishing cover 102; the four corners of the first arc extinguishing cover 101 are set as upper arc extinguishing angles 105; the four corners of the second arc extinguishing cover 102 are set as lower arc extinguishing angles 106; when the current flows in from left to right as shown in the figure, its arc direction is as Figure 10 shown.

[0039] As Figure 5 shown, the coil assembly 5 includes a metal shell 501, a winding 502, a magnetic conduction cylinder 503, a push rod 504, a moving iron core 505, a return spring 506 and a coil holder 507; the push rod 504 is fixedly installed below the insulating sleeve 14, a moving iron core 505 is fixedly installed on the outer wall of the push rod 504, and a return spring 506 is installed between the moving iron core 505 and the yoke iron plate 12; a metal shell 501 is fixedly installed on the outer wall of the moving iron core 505; a magnetic conduction cylinder 503 is fixedly installed on the outer wall of the metal shell 501, a coil holder 507 is fixedly installed on the outer wall of the magnetic conduction cylinder 503, and a winding 502 is fixedly installed inside the coil holder 507.

[0040] As Figures 7-8 shown, the two sides of the first magnetic block 10 and the second magnetic block 11 are provided with the words "N" and "S" to confirm the positive and negative poles; at the same time, a semi-circular notch 1001 is provided below the first magnetic block 10 and the second magnetic block 11 to assist the user in installation, improve the installation efficiency and ensure the installation accuracy.

[0041] As Figure 2 shown, an inflation pipe 13 is fixedly installed below the yoke iron plate 12, and the inflation pipe 13 extends into the ceramic arc extinguishing cover 1.

[0042] When in use, the auxiliary conductive column 401, the transition piece 402, the lower moving contact conductive column 203, the upper moving contact conductive column 303, the ceramic arc extinguishing cover 1 and the square piece 8 are welded by high-temperature vacuum technology to form a ceramic cover assembly. The auxiliary moving reed 403, the insulating sleeve 14 and the push rod 504 are integrally injection-molded to achieve insulation between the three parts under high voltage. The push rod 504 is assembled with the upper moving contact piece 302, the upper contact spring 301, the lower moving contact piece 202, the lower contact spring 201, the yoke iron plate 12, the moving iron core 505 and the return spring 506 to form a moving assembly; the convex platform 3021 of the upper moving contact piece and the first positioning convex platform 1401 are reliably positioned with the upper contact spring 301, and the convex platform 2021 of the lower moving contact piece and the second positioning convex platform 1402 are reliably positioned with the lower contact spring 201. The ceramic cover assembly is assembled with the moving assembly and the metal shell 501; after assembly, it is welded into one body by laser welding process to form a sealed space; then a special mixed gas for arc extinguishing is filled through the gas filling pipe 13, and finally the gas filling pipe 13 is sealed by cold pressing jaw to keep a certain pressure of arc extinguishing gas inside.

[0043] Further, the ceramic arc extinguishing cover 1 is made of 95% Al 2 O 3 powder material by a special dry pressing process and sintered at high temperature; a metallized layer is coated on the surface and nickel is plated.

[0044] Further, the square piece 8 and the auxiliary conductive column 401 are both processed from precision alloys with a thermal expansion coefficient similar to that of the ceramic cover.

[0045] Further, the lower moving contact conductive column 203 and the upper moving contact conductive column 303 are processed from special tellurium copper alloy.

[0046] Embodiment 2:

[0047] As Figure 11 shown, different from Embodiment 1; when the current flows in from the right to the left direction as shown in the figure, its arc direction is as Figure 11 shown.

[0048] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A multi-circuit high-voltage DC contactor with a new structure, characterized in that: The invention comprises a ceramic arc extinguishing hood (1), a lower contact circuit (2), an upper contact circuit (3), an auxiliary contact circuit (4), an insulating sleeve (14) and a coil assembly (5); the upper contact circuit (3), the lower contact circuit (2) and the auxiliary contact circuit (4) are arranged inside the ceramic arc extinguishing hood (1); the upper contact circuit (3), the lower contact circuit (2) and the auxiliary contact circuit (4) are installed on the insulating sleeve (14); the bottom of the insulating sleeve (14) is connected to the coil assembly (5); the upper contact circuit (3) is arranged above the lower contact circuit (2); and the auxiliary contact circuit (4) is arranged above the upper contact circuit (3).

2. According to a novel structure of multi-circuit high-voltage DC contactor described in claim 1, it is characterized in that: The auxiliary contact circuit (4) comprises an auxiliary conductive column (401), a transition piece (402) and an auxiliary movable spring piece (403); the auxiliary conductive column (401) is movably mounted on the top of the ceramic arc extinguishing cover (1), extending from the top of the ceramic arc extinguishing cover (1) to the inside of the ceramic arc extinguishing cover (1); the transition piece (402) is fixedly mounted on one end of the auxiliary conductive column (401) away from the ceramic arc extinguishing cover (1); the end of the auxiliary conductive column (401) away from the transition piece (402) is fixedly connected to the auxiliary movable spring piece (403); and the auxiliary movable spring piece (403) is fixedly mounted on the top of the insulating sleeve (14).

3. According to a novel structure of multi-circuit high-voltage DC contactor described in claim 1, it is characterized in that: A magnetic yoke (9) is fixedly mounted below the coil assembly (5), a yoke iron plate (12) is fixedly mounted on the top of the magnetic yoke (9), a square frame sheet (8) is fixedly mounted above the yoke iron plate (12), and the ceramic arc-extinguishing cover (1) is fixedly mounted above the square frame sheet (8).

4. According to a novel structure of multi-circuit high-voltage DC contactor as described in claim 2, it is characterized in that: The ceramic arc-extinguishing hood (1) comprises a first arc-extinguishing hood (101) and a second arc-extinguishing hood (102); the first arc-extinguishing hood (101) is arranged above the second arc-extinguishing hood (102).

5. According to the novel structure of multi-circuit high-voltage DC contactor described in claim 4, it is characterized in that: The upper contact circuit (3) is arranged inside the first arc extinguishing cover (101), and the upper contact circuit (3) comprises an upper contact spring (301), an upper movable contact piece (302) and an upper movable contact conductive column (303); an upper movable contact piece boss (3021) is arranged at the bottom of the upper movable contact piece (302); the upper movable contact conductive column (303) is arranged above both ends of the upper movable contact piece (302) and is fixedly mounted above the top of the first arc extinguishing cover (101).

6. According to the novel structure of multi-circuit high-voltage DC contactor described in claim 5, it is characterized in that: The lower contact circuit (2) is arranged inside the second arc extinguishing cover (102), and the lower contact circuit (2) comprises a lower contact spring (201), a lower movable contact piece (202) and a lower movable contact conductive column (203); a lower movable contact piece boss (2021) is arranged at the bottom of the lower movable contact piece (202); the lower movable contact conductive column (203) is arranged above the two ends of the lower movable contact piece (202), and is fixedly mounted above the two ends of the second arc extinguishing cover (102) in the length direction.

7. A multi-circuit high-voltage DC contactor of a novel structure according to claim 6, characterized in that: An auxiliary moving reed (403) is fixedly installed above the top of the insulating sleeve (14); a first through groove (1404) and a second through groove (1405) are arranged above the insulating sleeve (14), and the first through groove (1404) is arranged above the second through groove (1405); a first positioning boss (1401) is arranged below the first through groove (1404); a second positioning boss (1402) is arranged below the second through groove (1405); a fixed seat (1403) is fixedly installed below the insulating sleeve (14).

8. According to the novel structure of multi-circuit high-voltage DC contactor described in claim 7, it is characterized in that: The upper contact spring (301) is fixedly installed above the first positioning boss (1401) and arranged inside the first through groove (1404). The upper moving contact piece boss (3021) is arranged corresponding to the first positioning boss (1401), and the upper moving contact piece (302) is inserted into the first through groove (1404); the lower contact spring (201) is fixedly installed above the second positioning boss (1402) and arranged inside the second through groove (1405). The lower moving contact piece boss (2021) is arranged corresponding to the second positioning boss (1402), and the lower moving contact piece (202) is inserted into the second through groove (1405).

9. A multi-circuit high-voltage DC contactor of a novel structure according to claim 8, characterized in that: A second magnet frame (7) is fixedly installed on the outer wall of the first arc extinguishing cover (101), and a first magnet frame (6) is fixedly installed on the outer wall of the second arc extinguishing cover (102). The second magnet frame (7) and the first magnet frame (6) are in a "C" structure, and the opening directions of the "C" structures of the second magnet frame (7) and the first magnet frame (6) are opposite; the side wall in the length direction of the second magnet frame (7) is attached to the outer wall of the first arc extinguishing cover (101); the side wall in the length direction of the first magnet frame (6) is attached to the outer wall of the second arc extinguishing cover (102); second magnetic blocks (11) are installed between the inner walls at both ends in the length direction of the "C" structure of the second magnet frame (7) and the outer wall of the first arc extinguishing cover (101); first magnetic blocks (10) are installed between the inner walls at both ends in the length direction of the "C" structure of the first magnet frame (6) and the outer wall of the second arc extinguishing cover (102).

10. A multi-circuit high-voltage DC contactor of a novel structure according to claim 9, characterized in that: The letters "N" and "S" are arranged on both sides of the first magnetic block (10) and the second magnetic block (11); a semi-circular notch (1001) is arranged below the first magnetic block (10) and the second magnetic block (11).

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