A clean air insulation quick grounding switch arc extinguishing device for high voltage GIS

Abstract

The utility model discloses a clean air insulation's quick grounding switch arc extinguishing device for high pressure GIS, including air cylinder, movable contact, piston ring, check valve piece, spring contact finger, static contact, crooked arm, transmission main shaft, movable contact guide rod passes through air cylinder main body and connects crooked arm, and there is annular gap between guide rod and air cylinder main body inner wall, and main contact passes through electric contact main body and is matched with static contact, and spring contact finger is installed on the inner wall of electric contact main body and is sleeved on main contact, and hollow air passage is equipped in main contact, and guide rod connecting end is equipped with exhaust hole, and the variable diameter end lateral wall of air cylinder main body is equipped with air hole, and piston ring is located in air cylinder main body and is sleeved in the connecting place of guide rod and main contact and divides annular gap into air chamber and balance air chamber, and there is back gas hole on piston ring, and check valve piece is close to piston ring and can block or open back gas hole. The utility model makes quick grounding switch have greater opening and closing induction current capacity under clean air insulation condition.

Claims

1. A fast grounding switch arc extinguishing device with clean air insulation for high-voltage GIS, characterized in that: The device includes a pressure cylinder, a moving contact, piston rings, a check valve plate, a spring-loaded contact finger, a stationary contact, a crank arm, and a transmission shaft connected to the crank arm. The pressure cylinder consists of two concentric cylindrical sections with different diameters. The section with the larger diameter is the main body of the pressure cylinder, and the section with the smaller diameter is the main electrical contact body. The moving contact passes axially through the interior of the pressure cylinder and is formed by connecting a guide rod and a main contact. The guide rod passes through the main body of the pressure cylinder and extends out to connect to the crank arm, with an annular gap between the guide rod and the inner wall of the pressure cylinder body. The main contact passes through the main electrical contact body and extends out to engage with the stationary contact. The spring-loaded contact finger is mounted on the electrical contact... The main contact is mounted on the inner wall of the main contact body. An air passage is provided through the main contact along its axial direction. An exhaust passage is provided at the connecting end of the guide rod, which communicates with the air passage and the annular gap. A vent hole is provided on the side wall of the variable diameter end of the compressor body. The piston ring is located inside the compressor body and is mounted at the connection between the guide rod and the main contact, thereby dividing the annular gap into a compressor chamber that communicates with the exhaust passage and a balance chamber that communicates with the vent hole. Return air holes that communicate with the compressor chamber and the balance chamber are distributed on the circumference of the piston ring. The check valve plate is tightly attached to the piston ring and can block or open the return air holes.

2. The fast grounding switch arc extinguishing device according to claim 1, characterized in that: The fast grounding switch arc extinguishing device includes a first guide sleeve, a second guide sleeve, and a third guide sleeve. A cylinder cover is installed at the end of the cylinder body. The cylinder cover has an opening for a guide rod to extend out. A first mounting groove is provided on the wall of the opening. The first guide sleeve is disposed in the first mounting groove and tightly fitted on the guide rod to form a relatively sealed sliding fit. A second mounting groove is provided on the outer edge of the piston ring. The second guide sleeve is disposed in the second mounting groove and tightly contacts the inner wall of the cylinder body to form a relatively sealed sliding fit. A third mounting groove is provided in the end of the electrical contact body. The third guide sleeve is disposed in the third mounting groove and tightly fitted on the main contact to form a relatively sealed sliding fit.

3. The fast grounding switch arc extinguishing device according to claim 2, characterized in that: The connecting end of the guide rod has a threaded protrusion, and the connecting end of the main contact has a threaded groove. The threaded protrusion and the threaded groove are adapted to each other. The air passage of the main contact has its orifice at its connecting end located on the bottom surface of the threaded groove. The exhaust passage on the guide rod consists of interconnected radial holes and axial holes. Multiple radial holes are distributed circumferentially on the side wall of the guide rod. The axial hole is a countersunk hole and is opened on the end face of the threaded protrusion. The threaded protrusion is screwed into the threaded groove to connect the axial hole with the air passage.

Images