CN-122000236-A - Direct current contactor with pre-charging function

CN122000236ACN 122000236 ACN122000236 ACN 122000236ACN-122000236-A

Abstract

The invention relates to the field of contactors and discloses a direct current contactor with a pre-charging function, which comprises a shell and an iron cup assembly, wherein a retainer is fixedly arranged in the shell, the iron cup assembly is sleeved in the retainer, a pre-charging assembly used for forming a pre-charging loop is jointly arranged between the retainer and the shell, the pre-charging assembly comprises a resistance wire fixedly wound on the outer surface of the retainer, and the resistance wire is wound on the basis of the retainer, so that the occupied space in the shell is reduced and the resistance value is provided. The invention provides an improved scheme of a pre-charging assembly comprising a wound resistance wire through the cooperation among the retainer, the resistance wire, the shell and the like, and also provides a structural innovation of the nested retainer and the wound resistance wire, thereby solving the multiple technical problems of limited internal space, insulation, heat insulation, electromagnetic compatibility and the like of the direct current contactor shell, and having higher practicability when being applied to switches of battery packs and electric drive positions of industrial vehicles.

Inventors

LIU BAOGONG
YUAN WEIHAO
LI QINGFENG
JI SHAOBIN
Fan Jianru

Assignees

东科新能(无锡)电子有限公司
东科新能(苏州)电子有限公司

Dates

Publication Date: 20260508
Application Date: 20260228

Claims (10)

1. The utility model provides a take direct current contactor of precharge function, includes casing and iron cup subassembly, its characterized in that, the inside fixed mounting of casing has the holder, and iron cup subassembly cover is established in the holder, is provided with the precharge component that is used for constituting precharge circuit jointly between holder and the casing, and precharge component includes the resistance wire of fixed coiling at the holder surface, through the coiling of resistance wire based on the holder, reduces occupation space in the casing and provides the resistance.
2. The direct current contactor with a pre-charging function according to claim 1, wherein the pre-charging assembly further comprises a circuit board fixedly installed in the housing, the circuit board is electrically connected with the relay and the time chip in the housing, and two ends of the resistance wire are respectively connected with two output ends of the relay.
3. The dc contactor with pre-charge function according to claim 2, wherein the circuit board controls to close the relay on resistance wire first, limit current by the wound resistance wire, then close the main positive contactor and open the relay.
4. The direct current contactor with the pre-charging function according to claim 2, wherein an annular groove for winding the resistance wire is formed in the outer surface of the retainer, a lead-out groove communicated with the annular groove is formed in the top of the retainer in a penetrating mode, a conductive terminal communicated with the resistance wire is fixedly arranged in the lead-out groove, and the conductive terminal is communicated with the output end of the relay through an internal lead.
5. The direct current contactor with the pre-charging function according to claim 4, wherein the number of the conductive terminals is two, and the two conductive terminals are fixedly connected with two ends of the resistance wire respectively.
6. The direct current contactor with the pre-charging function according to claim 4, wherein one end of the resistance wire is connected with the conductive terminal, the other end of the resistance wire is subjected to insulation end sealing treatment, a lifting assembly protruding from the top of the iron cup assembly is slidably mounted on the retainer, and the lifting assembly is abutted against the outer surface of the resistance wire on one hand and is electrically connected with the output end of the relay through a flexible wire on the other hand.
7. The direct current contactor with the pre-charging function according to claim 6, wherein the lifting assembly comprises a sliding seat which is installed on the retainer in a vertically sliding manner, a contact block is elastically connected to the surface of the sliding seat, which is close to the resistance wire, through a spring, and the contact block has a tendency to approach the direction of the resistance wire under the action of the spring.
8. The direct current contactor with the pre-charging function according to claim 6, wherein the abutting block is made of a conductive material, one end of the abutting block abuts against the outer surface of the resistance wire, the other end of the abutting block is fixedly connected with the flexible wire, and a vertical groove for accommodating the flexible wire is formed in the surface, away from the resistance wire, of the sliding seat.
9. The dc contactor with a priming function according to claim 6, wherein a locking bolt for limiting the slide is screw-fitted to the housing, screwed from a front surface of the housing, slid along the iron cup assembly and abutted against a surface of the slide.
10. The direct current contactor with the pre-charging function according to any one of claims 2 to 9, wherein an annular chamber for arranging the resistance wire is formed between the outer surface of the holder and the inner wall of the housing, a square chamber for arranging the circuit board is formed on the front side of the inner wall of the housing, and the annular chamber and the square chamber are correspondingly communicated.

Description

Direct current contactor with pre-charging function Technical Field The invention relates to the technical field of contactors, in particular to a direct current contactor with a pre-charging function. Background In order to solve the problem of switching-on surge current, a circuit scheme (shown in fig. 1) without a pre-charging loop is adopted by a small part of clients in the current market, a main positive contactor and a main negative contactor are closed instantly, a direct current power supply charges an equivalent capacitor of the loop, instant large current passes through the loop, and contact ablation adhesion of the contactor is easy to cause. Most customers in the current market adopt a circuit scheme with a pre-charging loop (shown in fig. 2), and a pre-charging contactor, a pre-charging resistor and a loop wire are connected in parallel at two ends of a main positive contactor to form the pre-charging loop. Before the main loop is connected, the main negative contactor and the pre-charging contactor are closed, the direct current power supply charges the capacitor through the pre-charging resistor in a current limiting mode, the circuit is small at the moment and does not damage the contactor, after the capacitor is charged to a certain voltage, the main positive contactor is closed again, the capacitor voltage is close to the direct current power supply voltage, and too high current cannot be generated. However, the circuit scheme system of the pre-charging loop has low integration level, needs to additionally configure an independent pre-charging contactor and pre-charging resistor, occupies a large amount of installation space, cannot meet the severe space size requirements of new energy automobiles and the like, has obvious disadvantages especially for compact and miniature electric automobiles, and therefore has certain use limitations. Therefore, it is necessary to provide a dc contactor with a pre-charging function to solve the above-mentioned problems. Disclosure of Invention The present invention is directed to a dc contactor with a pre-charging function, so as to solve the problems set forth in the above-mentioned background art. In order to achieve the above purpose, a direct current contactor with a pre-charging function is designed, which can effectively reduce the occupied installation space and ensure enough resistance value. Based on the thought, the direct current contactor with the pre-charging function comprises a shell and an iron cup assembly, wherein a retainer is fixedly arranged in the shell, the iron cup assembly is sleeved in the retainer, a pre-charging assembly used for forming a pre-charging loop is jointly arranged between the retainer and the shell, the pre-charging assembly comprises a resistance wire fixedly wound on the outer surface of the retainer, and the resistance wire is wound on the basis of the retainer, so that occupied space in the shell is reduced, and resistance is provided. As a further scheme of the invention, the pre-charging assembly further comprises a circuit board fixedly arranged in the shell, the circuit board is electrically connected with the relay and the time chip in the shell, and two ends of the resistance wire are respectively communicated with two output ends of the relay. The circuit board controls the relay to be closed to switch on the resistance wire, the current is limited by the wound resistance wire, and then the main positive contactor is closed and the relay is opened. The invention further provides a scheme that an annular groove for winding the resistance wire is formed in the outer surface of the retainer, a lead-out groove communicated with the annular groove is formed in the top of the retainer in a penetrating mode, a conductive terminal communicated with the resistance wire is fixedly arranged in the lead-out groove, and the conductive terminal is communicated with the output end of the relay through an internal lead. As a further scheme of the invention, the number of the conductive terminals is two, and the two conductive terminals are respectively fixedly connected with the two ends of the resistance wire. As a further scheme of the invention, one end of the resistance wire is communicated with the conductive terminal, the other end of the resistance wire is subjected to insulation end sealing treatment, a lifting assembly protruding from the top of the iron cup assembly is slidably arranged on the retainer, and the lifting assembly is abutted against the outer surface of the resistance wire on one hand and is electrically connected with the output end of the relay through a flexible wire on the other hand. As a further scheme of the invention, the lifting assembly comprises a sliding seat which is arranged on the retainer in a vertically sliding manner, the surface of the sliding seat, which is close to the resistance wire, is elastically connected with a collision block through a spring, and the collision block