Active shaft sealing device of anti-corrosion and anti-poison high-pressure centrifugal fan

Abstract

The invention discloses an active shaft sealing device of an anti-corrosion and anti-poison high-pressure centrifugal fan. The active shaft sealing device of the anti-corrosion and anti-poison high-pressure centrifugal fan comprises a fan housing, wherein the fan housing is provided with an air inlet and an air outlet; a fan housing fixing plate is arranged on one side of the fan housing; a motor shaft hole and a mechanical sealing ring are arranged in the center of the fan housing fixing plate; and a circle of negative pressure retaining ring belt is arranged on the inner side of the fan housing fixing plate. According to the active shaft sealing device of an anti-corrosion and anti-poison high-pressure centrifugal fan provided by the invention, the negative pressure retaining ring belt is arranged on the inner side of the fan housing fixing plate, so that part of high-pressure poisonous or corrosive gas is prevented from entering a motor shaft cavity; and meanwhile, negative pressure sealing fan blades are annularly arranged on the back of an impeller rear disc, and when a centrifugal fan impeller rotates in the forward direction, negative pressure is formed in the motor shaft cavity, and extremely little external air is sucked into the motor shaft cavity, so that high-pressure toxic or corrosive gas is thoroughly prevented from entering the motor shaft cavity, a motor is prevented from being corroded, the service life of the motor is prolonged, energy is saved, efficiency is high, and meanwhile, the toxic gas is prevented from overflowing from a gap of the mechanical sealing ring to pollute the environment and even endanger personal safety.

Description

technical field [0001] The invention belongs to the technical field of fans, and in particular relates to an active shaft sealing device of an anti-corrosion and anti-virus high-pressure centrifugal fan. Background technique [0002] Anti-corrosion and anti-virus fans are generally used to transport gas in chemical industry, metal surface treatment or military industry. Existing fans generally include a casing and an impeller arranged in the casing. When the fan is used to transmit toxic or highly corrosive gas, because the shaft hole of the motor cannot be completely sealed, the poisonous or highly corrosive gas will corrode the motor from the shaft hole of the motor, pollute the environment and even endanger personal safety. Even if the anti-corrosion cover is set, harmful substances will still enter the motor from the slit of the anti-corrosion cover of the motor housing to corrode the motor. Moreover, the anti-corrosion cover will further reduce the heat dissipation ...

AI Technical Summary

Problems solved by technology

When the fan is used to transmit toxic or highly corrosive gas, because the shaft hole of the motor cannot be completely sealed, the toxic or highly corrosive gas will corrode the motor from the shaft hole of the motor, pollute the environment and even endanger personal safety

Even if the anti-corrosion cover is installed, harmful substances will still enter the motor from the slit of the anti-corrosion cover of the motor casing to corrode the motor

And the installation of the anti-corrosion cover will further reduce the heat dissipation effect of the motor, and the motor cannot discharge heat in time, resulting in a decrease in work efficiency and even burning the motor

Images