CN-121171838-B - High-voltage direct-current contactor with high-current bearing function

CN121171838BCN 121171838 BCN121171838 BCN 121171838BCN-121171838-B

Abstract

The invention relates to the technical field of contactors, in particular to a high-voltage direct-current contactor with high current, which comprises an arc extinguish chamber, wherein a contact rod and a movable contact plate are arranged in the arc extinguish chamber, a control push rod is arranged below the movable contact plate, the movable contact plate is driven to move up and down by the control push rod, so that the movable contact plate is contacted with or separated from the contact rod, the on-off control of the contactor is realized, and the end part of the control push rod is fixedly provided with a ring groove rod part.

Inventors

BAO WEI
PENG TAO
ZHOU WEIGANG
ZHENG WEISHANG

Assignees

浙江和诚智能电气有限公司

Dates

Publication Date: 20260512
Application Date: 20251124

Claims (7)

1. The high-voltage direct current contactor with high current comprises an arc extinguish chamber, wherein a contact rod and a movable contact plate are arranged in the arc extinguish chamber, a control push rod is arranged below the movable contact plate, and the movable contact plate is driven to move by the control push rod to make the movable contact plate contact with or separate from the contact rod, so that the on-off control of the contactor is realized; The self-locking traction device comprises a ring sleeve table, a ring groove rod part, a ring sleeve table and a compressed air tank, wherein the ring sleeve table is arranged at the inner side and the outer side of the ring sleeve table, a self-locking traction assembly is arranged at the inner side and the outer side of the ring sleeve table, a first electromagnetic valve is arranged at the outer side of the compressed air tank in a communicating mode, the compressed air tank is communicated with the self-locking traction assembly through the first electromagnetic valve, when the first electromagnetic valve is opened, compressed air in the compressed air tank enters the self-locking traction assembly through the first electromagnetic valve, the ring sleeve table and the ring groove rod part are locked relatively by the self-locking traction assembly, and then the ring sleeve table is driven to move downwards; The self-locking traction assembly comprises a movable locking block, a V-shaped elastic sheet and a cylindrical cavity, wherein the movable locking block is movably arranged in a ring sleeve table, elastic pressure is applied to the movable locking block by the V-shaped elastic sheet, so that the movable locking block has an elastic trend of moving away from a ring groove rod part, the cylindrical cavity is arranged in the ring sleeve table, a bottom groove cavity is arranged at the bottom of the cylindrical cavity, a piston part is arranged in the cylindrical cavity, the piston part is in airtight contact with the cylindrical cavity, a pushing column is fixedly arranged on the piston part, when the pushing column moves upwards, the movable locking block can be pressed to drive the movable locking block to overcome the elastic force of the V-shaped elastic sheet, so that the movable locking block is in contact with the ring groove rod part, a piston spring is arranged on the upper part of the piston part, an intercommunication loop is arranged in the ring sleeve table, a plurality of bottom groove cavities are mutually communicated through the intercommunication loop, a first air pipe is arranged on the outside of the bottom groove cavity, a compressed air tank is communicated with the first air pipe through a first electromagnetic valve, and when positive pressure air is input into the bottom groove cavity through the first air pipe, and the pushing column can be driven to move upwards through the air pressure.
2. The high-voltage direct current contactor with high current carrying capacity according to claim 1, wherein a reverse ring eave is fixedly arranged on the surface of the ring sleeve table, an annular piston is fixedly arranged on the reverse ring eave, a ring eave gas channel is arranged in the reverse ring eave, one end of the ring eave gas channel is communicated with the side wall of the cylindrical cavity, and the other end of the ring eave gas channel is communicated with the upper surface of the annular piston; When the piston part and the pushing column move upwards under the drive of positive pressure gas, the pushing column firstly extrudes and drives the movable locking block, and then the piston part passes through a communication port between the annular eave gas circuit and the side wall of the cylindrical cavity, so that the positive pressure gas is shunted into the annular eave gas circuit.
3. The high-voltage direct current contactor with high current carrying capacity according to claim 2, wherein the annular cylinder is arranged outside the annular piston and is matched with the annular piston to form a piston structure; The annular cylinder body is characterized in that a spring supporting eave is fixedly arranged on the inner wall of the annular cylinder body, a lifting spring is arranged on the spring supporting eave, and upward elastic supporting force is applied to the annular piston through the lifting spring.
4. The high-voltage direct-current contactor with high current carrying capacity as claimed in claim 1, wherein the annular sleeve table is further provided with a limiting column cavity, a column cavity side groove is formed in the side wall of the limiting column cavity, a limiting short column is arranged in the limiting column cavity, and the limiting short column can only axially move in the limiting column cavity.
5. The high-voltage direct-current contactor with high current carrying capacity as claimed in claim 4, wherein the limiting short column is internally provided with a transverse column cavity, a transverse piston is arranged in the transverse column cavity, the transverse column cavity is in airtight contact with the transverse piston, one side of the transverse piston is provided with a transverse cantilever shaft, and the other side of the transverse piston is provided with a cantilever shaft tension spring.
6. The high-voltage direct current contactor with high current carrying capacity of claim 5, wherein the transverse shaft penetrates through the side groove of the column cavity, and the shaft tension spring exerts elastic tension on the transverse piston, so that the transverse piston has a tendency of moving away from the rod part of the annular groove; when the movable contact plate moves up to be in contact with the contact rod, the ring groove rod part is positioned above the transverse picking shaft.
7. The high-voltage direct current contactor with high current carrying capacity of claim 6, wherein a bottom air groove is formed in the lower portion of the transverse column cavity in a penetrating manner, a corrugated air bag is arranged on the lower portion of the limiting short column, and the corrugated air bag is communicated with the transverse column cavity through the bottom air groove; The lower part of the limiting short column is connected with a short column tension spring which provides downward elastic tension for the limiting short column, so that the corrugated air bag is in a folded state; The second air pipe is communicated with the outside of the corrugated air bag, the second electromagnetic valve is communicated with the outside of the compressed air tank, and the second electromagnetic valve controls the on-off of air between the second air pipe and the compressed air tank; when the second electromagnetic valve is opened, the second air pipe inputs positive pressure air into the corrugated air bag, firstly the transverse picking shaft extends out and is positioned below the ring groove rod part, and then the corrugated air bag is inflated to expand so as to drive the limiting short column to move upwards.

Description

High-voltage direct-current contactor with high-current bearing function Technical Field The invention relates to the technical field of contactors, in particular to a high-voltage direct-current contactor with a large load current. Background The contactor is an electrical element which controls high-voltage current to be switched on and off by a low-voltage control signal, when the existing direct-current contactor passes through high current, contact points are easy to melt and weld due to heating of contact resistors, particularly under the working condition of quick charging or short circuit of an energy storage system of an electric automobile, when the high current passes through the contact rod and the movable contact plate, a certain adhesion probability exists due to slight melting of the contact points, the contactor attracts a movable armature to overcome the elastic force of an armature pressure spring through magnetic force generated after the contactor coil is electrified, so that the contact rod and the movable contact plate are contacted and conducted, in the resetting and breaking process, the contactor coil is powered off, at the moment, the contact rod and the movable contact plate are separated only by the downward pressure exerted by the armature pressure spring, once the contact rod and the movable contact plate are slightly melted and adhered, the downward pressure exerted by the armature is insufficient to push the contact rod and the movable contact plate to be separated, so that the phenomenon that the contactor cannot be disconnected is generated, the contactor continuously keeps the connection state and cannot be disconnected, and extremely high safety hazards exist under the working condition, and maintenance personnel are required to quickly arrive at site for repair. Disclosure of Invention The present invention is directed to a high voltage dc contactor capable of carrying a large current, which solves the above-mentioned problems of the prior art. The high-voltage direct current contactor comprises an arc extinguish chamber, wherein a contact rod and a movable contact plate are arranged in the arc extinguish chamber, a control push rod is arranged below the movable contact plate, the movable contact plate is driven to move up and down through the control push rod, the movable contact plate is contacted with or separated from the contact rod, on-off control of the contactor is achieved, an annular groove rod part is fixedly arranged at the end part of the control push rod, a ring sleeve table and a compressed gas tank are further arranged on the inner part and the outer part of the ring sleeve table, a first electromagnetic valve is arranged on the outer part of the compressed gas tank in a communicating mode, the compressed gas tank is communicated with the self-locking traction assembly through the first electromagnetic valve, and compressed gas in the compressed gas tank enters the self-locking traction assembly through the first electromagnetic valve when the first electromagnetic valve is opened, so that the ring sleeve table and the annular groove rod part are relatively locked at first, and then the ring sleeve table is driven to move downwards. The self-locking traction assembly comprises a movable locking block, a V-shaped elastic piece and a cylindrical cavity, wherein the movable locking block is movably arranged in the annular sleeve table, and the V-shaped elastic piece applies elastic pressure to the movable locking block, so that the movable locking block has an elastic trend of moving away from the rod part of the annular groove; the cylindrical cavity is formed in the annular sleeve table. The bottom groove cavity is formed in the bottom of the cylindrical cavity, the piston part is arranged in the cylindrical cavity, the piston part is in airtight contact with the cylindrical cavity, a pushing column is fixedly arranged on the piston part, and when the pushing column moves upwards, the movable locking block can be extruded to drive to overcome the elasticity of the V-shaped elastic sheet, so that the movable locking block is in contact locking with the annular groove rod part. The upper portion of piston portion is provided with piston spring, the intercommunication loop has been seted up to the inside of ring cover platform, makes intercommunication each other between a plurality of bottom tank chamber through the intercommunication loop, the outside intercommunication in bottom tank chamber is provided with first trachea, and compressed gas jar passes through first solenoid valve and first trachea intercommunication, when the positive pressure gas is input to bottom tank chamber to first trachea, can drive piston portion and pushing post through gas pressure and reciprocate. The surface of the annular sleeve table is fixedly provided with a reverse annular eave, an annular piston is fixedly arranged on the reverse annular eave, an annular eave gas circuit