Gas flow standard device and application method thereof

Abstract

The invention provides a novel gas flow standard device and an application method thereof. The gas flow standard device mainly comprises a standard flow meter set, a test stand for a to-be-tested flow meter, a signal acquisition and control system, a gas circulation power system and a high-pressure gas source, wherein the standard flow meter set, the to-be-tested flow meter and the gas circulation power system are communicated in sequence through a pipeline to construct an enclosed loop; the signal acquisition and control system is provided with a temperature measuring unit and a pressure measuring unit respectively at pipeline sections where the standard flow meter set and the to-be-tested flow meter are positioned, and is used for controlling each flow regulating valve in a high-pressure fan, a heat exchanger and the enclosed loop. The gas flow standard device has the advantages of small floor area, stable and adjustable gas detection pressure, low running noise and low running energy consumption.

Description

technical field [0001] The invention relates to a gas flow standard device. Background technique [0002] The gas flow standard device is a test device for the detection and calibration of gas flowmeters, and belongs to the upper-level working standard of various gas flowmeters. [0003] At present, there are two main principles of domestic gas flow standard devices: the sonic nozzle method gas flow standard device and the standard meter method gas flow standard device, which are divided into negative pressure suction type and positive pressure direct discharge type according to different pressure sources. For the gas flow standard device of the sonic nozzle method and the gas flow standard device of the standard meter method, no matter whether the negative pressure suction method or the positive pressure direct discharge method is used, the following disadvantages exist: [0004] Negative pressure suction type: [0005] 1) It does not meet the operating conditions of the ...

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Problems solved by technology

[0005] 1) It does not meet the operating conditions of the flowmeter, and cannot detect the high-pressure flowmeter;

[0006] 2) The working environment of the test cannot be satisfied, and the laboratory gas is directly extracted;

[0007] 3) The equipment operates with a lot of noise, and the working mode of the opening

[0009] 1) The high-pressure tank group occupies a large area and is expensive;

[0010] 2) High-pressure gas is directly discharged to the atmosphere, wasting energy;

[0011] 3) Pressure regulation and flow stability are difficult to guarantee

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