Control valve arc extinguishing device for thermal power plant

Abstract

The invention discloses a control valve arc extinguishing device for a thermal power plant, which comprises a shell, a static end conductive block, and an air blowing mechanism, wherein the air blowing mechanism comprises a sleeve and a cylinder; the cylinder and wire holes are formed in the periphery of the interior of the sleeve; the wire holes are fixedly connected to the bottom end of the cylinder; a second spring is fixedly installed at the bottom end of the interior of the cylinder; a piston is fixedly installed at the upper end of the second spring; the piston is slidably connected withthe cylinder; and an air injection ring pipe is fixedly installed on the surface of the inner wall of the sleeve. As the air blowing mechanism is arranged, in practical use, when a control valve circuit is cut off by the contact, through cooperation of downward movement of a movable conducting rod and the air blowing mechanism on the four sides, free electrons between the contacts are blown awayby wind power in the time period when the contacts are separated and are prone to arcing, so that the arcing inhibiting effect is achieved, burns of electric arcs to the contacts are effectively avoided, and the service life of the control valve is prolonged.

Description

technical field [0001] The invention relates to the technical field of thermal power plants, in particular to a control valve arc extinguishing device for thermal power plants. Background technique [0002] A thermal power plant, referred to as a thermal power plant, is a factory that uses combustibles (such as coal) as fuel to produce electrical energy. Its basic production process is: when the fuel is burned, the water is heated to generate steam, and the chemical energy of the fuel is converted into thermal energy. The steam pressure drives the steam turbine to rotate, and the thermal energy is converted into mechanical energy. Then the steam turbine drives the generator to rotate, and the mechanical energy is converted into electrical energy. The motive is usually a steam engine or a gas turbine. In some smaller power stations, an internal combustion engine may also be used. They all generate electricity by using the pressure drop in the process of turning high-temperatu...

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Problems solved by technology

Its basic production process is: when the fuel is burned, the water is heated to generate steam, and the chemical energy of the fuel is converted into thermal energy. The steam pressure drives the steam turbine to rotate, and the thermal energy is converted into mechanical energy. Then the steam turbine drives the generator to rotate, and the mechanical energy is converted into electrical energy. The motive is usually a steam engine or a gas turbine. In some smaller power stations, an internal combustion engine may also be used. They all generate electricity by using the pressure drop in the process of turning high-temperature, high-pressure steam or gas through a turbine into low-pressure air or condensed water. Generally, in thermal power plants, control valves are required. Generally, when the control valve breaks the circuit, an arc will be generated between the two contacts. If the arc is not extinguished in time, the circuit will be delayed and the contacts will be disconnected. Burnout, overvoltage breakdown and other faults, so most control valves have arc extinguishing devices

[0003] However, the most common installation in the control valve on the market is the vacuum arc extinguisher, but it cannot effectively prevent the generation of the arc. The burning of the head shortens the service life of the contact, which will reduce the service life of the control valve

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