Calibration device for gas flow meter and method thereof

Abstract

The invention relates to the field of calibration of a gas flow meter, is particularly applied to the calibration of a gas flow meter of nuclear power engineering and aims at resolving the problem that in the prior art, when the gas flow meter is calibrated, a calibration method is complicated and the calibration period is long. A calibration device of a flow meter is provided and comprises a gas pump. The output end of the gas pump is connected with a filter pressure release valve, the output end of the filter pressure release valve is connected with the flow meter to be calibrated, and the output end of the flow meter to be calibrated is connected with at least two standard flow meters connected in parallel. A detection pressure meter is arranged between the filter pressure release valve and the flow meter to be calibrated. The calibration device of the gas flow meter is simple in structure, capable of calibrating the flow meter directly on a construction site, short in calibration period, simple in calibration method, small in measurement data and simple in calculation.

Description

technical field [0001] The invention relates to the field of calibration of gas flow meters, in particular to the calibration of gas flow meters used in nuclear power engineering. Background technique [0002] Since argon is an inert gas with very stable chemical properties, it will not chemically react with metals even at high temperatures. Therefore, in the construction and maintenance of nuclear power plants, argon is usually used as a shielding gas in the welding process. In this way, argon can be used to protect the molten metal during the welding process, so that it cannot react with oxygen, nitrogen and other substances in the air, so as to prevent the welding part from being oxidized and produce pores, which will affect the welding quality. [0003] During the welding process, if the purity of argon gas is not high enough or the flow rate is too small, it will easily lead to the oxidation of the welding joint; if the flow rate is too large, it will easily lead to the...

AI Technical Summary

Problems solved by technology

[0021] In order to solve the problems of complex verification methods, low accuracy of verification results and long verification period in the prior art for gas flow meter verification, the present invention proposes a gas flow meter verification device, the gas flow meter verification device Including an air pump, the output end of the air pump is connected with a filter pressure reducing valve, the output end of the filter pressure reducing valve is connected with a flowmeter to be verified, and the output end of the flowmeter to be verified is connected with at least two standard flowmeters connected in parallel , a detection pressure gauge is set between the filter pressure reducing valve and the flowmeter to be verified

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