Positive pressure explosion-proof is to keep the pressure of protective gas inside the shell higher than the external atmospheric pressure to prevent the external explosive gas from entering the shell. The motor with explosion-proof method is called positive pressure explosion-proof motor. With the progress of science and technology in our country, the positive pressure explosion-proof motor is gradually produced in the major motor factories in China. As an explosion-proof type, positive pressure explosion-proof motor has great advantages in the application of large-scale explosion-proof motor structure, which is commonly used in the production of large-scale explosion-proof motor.

The specific explosion-proof measures of positive pressure explosion-proof motor are: add clean air or inert gas in the motor and maintain a certain pressure, so that the external explosive mixture can not enter the motor and contact with the sparks and heating parts in the motor, so as to achieve the purpose of explosion-proof. According to the gas supply, it can be divided into explosion-proof ventilation type and explosion-proof inflatable type.

In order to ensure the explosion-proof performance, a series of special tests must be carried out for the positive pressure explosion-proof motor. The following Ms.