Flow Measurement and Control Device of Rhombus Valve

Abstract

The invention discloses a flow measurement and control device for a rhombic valve, which includes a valve body and a butterfly plate, and is characterized in that it also includes an air differential pressure transmitter, a pipeline in front of the valve and a pipeline behind the valve, the air differential pressure transmitter The positive pressure interface of the air differential pressure transmitter is connected to the inner cavity of the pipeline in front of the valve through a positive pressure connecting pipe, and the negative pressure interface of the air differential pressure transmitter is connected to the inner cavity of the pipeline behind the valve through a negative pressure connecting pipe. The pipeline in front of the valve is set At the front end of the valve body, the pipeline behind the valve is arranged at the rear end of the valve body. The flow path formed by the valve plate and the valve body is a square, and the two vertices of the square are located at the highest point and the lowest point in the opening and closing direction of the valve plate, and the maximum diagonal length is equal to that of the pipe before the valve or after the valve. pipe inner diameter. The invention has simple, compact and reasonable structure, good stability, large flow adjustment range and high metering accuracy, can fully meet the requirement of the sewage treatment precise aeration system for real-time adjustment of air flow, and has obvious energy-saving effect.

Description

technical field [0001] The invention relates to a flow measurement and control device of a diamond valve, in particular to a special device used for accurate measurement and control of air flow in an accurate aeration system of sewage treatment, and belongs to the technical field of mechanical structure. Background technique [0002] In the existing technology, in the accurate aeration system of sewage treatment, the control valve and the gas flowmeter are installed in series, the flowmeter is located on the outlet pipeline near the control valve, and the signal detected by the flowmeter is fed back to the intelligent automatic control system , the control system will input the command corresponding to the process requirements into the control valve, so that the control valve will act to realize the real-time adjustment of the flow, so as to meet the different requirements of the air flow in each stage of the sewage treatment process. This flowmeter is a temperature differe...

AI Technical Summary

Problems solved by technology

This flowmeter belongs to the temperature difference flowmeter. Its principle is to obtain the change of the gas flow rate through the temperature change of the detection head. Due to the complexity of the pressure air movement in the pipeline and the unevenness of the temperature distribution, this type of flow rate is determined. The meter has low measurement accuracy and poor stability, which cannot meet the accuracy of the precise aeration system for flow control, and cannot meet the ideal energy-saving requirements

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