Anti-reverse device and method for fan used in power plant

Abstract

The invention relates to an anti-reversion device of a fan for a power plant and a method thereof. The device comprises a fan, a ratchet wheel, a pawl, a spring and a clamping groove, wherein the ratchet wheel sleeves a shaft of the fan; one end of the pawl is fixed to the ratchet wheel, the pawl can rotate around a fixed point, and the head of the pawl can extend and retract; one end of the spring is connected with the head of the pawl, and the other end of the spring is connected with the ratchet wheel; the clamping groove is coaxially connected with the ratchet wheel, and a plurality of notches are formed in the outer circumference of the clamping groove at intervals. The invention further discloses an anti-reversion method of the fan for the power plant. By using the anti-reversion device and the anti-reversion method, reversion cannot be generated under the driving of pressure air of the operating fan after the fan is stopped, thereby further guaranteeing that the fan can be normally started next time, guaranteeing the air pressure of the system, reducing potential safety hazards and improving the working efficiency.

Description

technical field [0001] The invention relates to a power plant fan, in particular to a power plant fan anti-reverse device and method thereof. Background technique [0002] Existing fans of thermal power plants (such as sealed fans) are generally arranged in parallel with two to provide air with a certain pressure to the sealed air system, one for work and one for standby. The outlet of each fan is equipped with a non-return door driven by wind pressure to automatically switch to prevent the air with a certain pressure from the working fan from leaking into the backup fan. When the working fan fails, trips and shuts down, the outlet check door is automatically closed, and the standby fan is automatically started and put into operation immediately, and the outlet check door is opened to provide pressurized air to the system to ensure the safe and stable operation of the generator set. [0003] Since the check doors at the outlets of the two blowers are mechanical structures, ...

AI Technical Summary

Problems solved by technology

But when the working fan trips and the backup fan needs to be put into operation immediately, the backup fan needs to overcome the process from reverse to forward rotation, that is, it needs to overcome the huge moment of inertia of the backup fan. It is often during this process that the motor of the backup fan appears The action of over-current protection prevents the standby fan from starting normally, so that the wind pressure of the system cannot be guaranteed, resulting in the outage of the generator set in the thermal power plant and safety accidents

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