Pressure limiting water seal device for low pressure centrifugal fan

Abstract

Provided is a pressure limiting water seal device of a low pressure centrifugal fan. The pressure limiting water seal device of the low pressure centrifugal fan is characterized in that an air inlet of a whirlwind dehydrator is communicated with a U-type water seal tank exhaust pipe on the upper portion of a normal pressure tank body of a U-type water seal tank; the upper portion of the normal pressure tank body of the U-type water seal tank is communicated with an air supply main pipeline through an air inlet pipeline; the U-type water seal tank is provided with a water level indicator used for measuring water level inside the normal pressure tank body of the U-type water seal tank; the U-type water seal tank is filled with liquid of set height; safe dispersion pressure of gas of an outlet of the low pressure centrifugal fan is controlled by setting the height difference of the water level to achieve on-off of gas; a water replenishing valve is installed on the upper portion of the normal pressure tank body of the U-type water seal tank, and a drain valve is installed at the bottom; a drain pipe of the whirlwind dehydrator is communicated with the bottom of the U-type water seal tank. The pressure limiting water seal device of the low pressure centrifugal fan has the advantages that safe pressure of gas of a gas supply main pipeline is controlled accurately, response is sensitive, a draught fan operates stably, the structure is simple, and the maintenance expenses are low. The pressure limiting water seal device of the low pressure centrifugal fan can be mainly applied to safe pressure control for operation of the low pressure centrifugal fan.

Description

technical field [0001] The invention relates to a pressure-limiting water seal device used in the technical field of low-pressure centrifugal fans, which uses the height of water level to control the exhaust pressure of low-pressure centrifugal fans. Background technique [0002] Existing low-pressure centrifugal fans have load fluctuations during operation. In order to prevent the pressure from exceeding its safe design pressure, an air inlet regulating door is often installed at the air inlet, or an air release valve is installed on the exhaust pipe, which has the following disadvantages: [0003] 1. The pressure control effect is not ideal. There is hysteresis in the operation of the air inlet regulating door or the air discharge valve, and the pressure will exceed its design safety pressure instantaneously, especially in the low flow range, forming a surge phenomenon, and the vibration of the fan shaft will increase, which will affect the smooth operation of the fan. ca...

AI Technical Summary

Problems solved by technology

[0003] 1. The effect of pressure control is not ideal

The air inlet adjustment door or the air discharge valve has hysteresis in operation, and the pressure will exceed its design safety pressure instantaneously, especially in the low flow range, forming a surge phenomenon, and the vibration of the fan shaft will increase, affecting the smooth operation of the fan. cause damage to the unit

[0004] 2. High investment and maintenance costs

The method of installing the vent valve in the exhaust pipe requires high valve control precision, and a corresponding electrical control system is required, and the initial investment and subsequent maintenance costs must be paid.

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