A thin-walled cylindrical centrifugal gas flowmeter

Abstract

The invention discloses a gas mass flow meter which comprises a flow meter body. A flow meter main body is arranged on the flow meter body and comprises a thin-walled cylindrical centrifugal type cavity (hereinafter referred to as cavity). The cavity comprises a gas duct body and a cylinder. The gas duct body is provided with a gas inlet, a front gas duct, a front pressure measuring point, a reargas duct, a rear pressure measuring point and a gas outlet. Centrifugal force is formed through the cylindrical cavity so that gas can make sufficient contact with the thin wall of the cavity, gas molecular kinetic energy is reduced, the pressure of gas flowing through the cavity is reduced, the variation of pressure before and after the gas flows through the cavity is measured through a differential pressure sensor, compensation is conducted through a temperature sensor, and the mass flow of the gas is calculated. The linear correspondence of the measured differential pressure value and the flow can be realized. The flow meter is high in repeatability, precision, durability and practicability and suitable for measuring various types of gases.

Description

technical field [0001] The invention relates to a gas flow meter, which can be applied to the fields of industrial instrument measurement and medical equipment, for example, it can measure the flow of various gases with high precision in medical ventilators and anesthesia machines. Background technique [0002] At present, a traditional plate orifice gas flowmeter is widely used in the market. The method of measuring the gas pressure difference at both ends of the throttling element in the air channel by a differential pressure sensor is used to measure the mass and flow rate of the gas. Flow meters have the following main disadvantages: [0003] (1) The gas flow range is relatively low; [0004] (2) Poor linearity of gas flow; [0005] (3) It is not easy to calibrate during use; [0006] Therefore, the traditional plate orifice differential pressure gas flowmeter is suitable for measurement occasions with large gas flow and low accuracy requirements. [0007] At present...

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Problems solved by technology

[0010] The invention is a device for measuring gas flow by differential pressure method, which has simple structure, fast real-time response and high measurement accuracy, and overcomes the disadvantages of traditional plate-hole differential pressure method, such as low range ratio of gas flow measurement, non-linearity and difficult calibration, etc. At the same time, it also overcomes the shortcomings of the hot wire gas flow sensor, which is easily affected by water in the gas and has a short service life.

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