Large diameter gas measuring meter

Abstract

The invention discloses a large diameter gas measuring meter. The end portion of a flow meter is provided with a Venturi tube outer tube, the inside of the Venturi tube outer tube is provided with a Venturi tube inner tube to form a throttle body, a positive pressure guide tube and a negative pressure guide tube are arranged inside a protective pipe, the upper ends of the positive pressure guide tube and the negative pressure guide tube are fixed onto a connecting plate through a flange, the portion of the connecting plate, which is located at the rear of the protective pipe, is provided with a temperature measuring tube, pressure sensors arranged inside the negative pressure guide tube and the positive pressure guide tube and a temperature sensor arranged inside the temperature measuring tube are jointly connected with a signal processing display, and a thermal accelerometer is arranged inside the protective tube and is connected with the signal processing display. The double Venturi structure of the large diameter gas measuring meter improves the accuracy and stability of the measurement of flow-velocity fluid; when a flow is below the lower limit of a flow sensor, the gated thermal accelerometer works, the advantages of accurately measuring micro flows of a thermal acceleration sensor is fully taken advantages of, and the measuring range of an original flow meter is widened.

Description

technical field [0001] The invention belongs to the field of gas metering, in particular to a large-diameter gas measuring instrument. Background technique [0002] As we all know, when measuring gas flow in large-diameter pipelines, due to reasons such as large caliber, low flow velocity, and complex flow field distribution, the following problems exist in the use of traditional gas flowmeters: 1. There is no long enough space on the installation position of large-diameter pipelines. The straight pipe section is difficult to install; 2. The traditional gas flow meter has an integral structure, which is difficult to replace after being blocked, and the maintenance cost is high; 3. The traditional gas flow meter has high requirements on the flow rate, and the throttling parts are easy to wear, poor stability, and low measurement accuracy. And because the air flow velocity in the gas pipeline often occurs too fast and too slow, the air flow generally cannot be accurately recor...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a large-diameter gas measuring instrument, which aims to solve the problem that the existing gas flowmeter has high requirements on the flow rate, the throttling parts are easy to wear, the stability is poor, and the measurement accuracy is low. The situation of too fast and too slow occurs, and the airflow is generally not accurately recorded by the flow meter

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