Low-flow gas control device and using method thereof

Abstract

The invention discloses a low-flow gas control device, which is characterized in that: a gas cylinder outlet is sequentially connected with a manual valve, a decompressor, a heat exchanger component, a filter, a mass flowmeter, a solenoid valve and a sonic nozzle component through pipelines, wherein the inlet and outlet of the decompressor respectively lead to a branch pipeline connecting a pressure gauge and the manual valve; a temperature sensor and a pressure sensor are connected to the inside of the pipeline in front of the sonic nozzle component; and another pressure sensor is connected to the inside of the pipeline behind the sonic nozzle component. The method can respectively realize flow control in different ranges by adjusting pressure in front of a sonic nozzle or replacing the sonic nozzle with the sonic nozzles with different throat diameters; can realize stable supply of a gas flow by using the performance characteristics of the sonic nozzle and can eliminate two-phase flow influence by gasifying a small amount of liquid contained in an incoming flow with a heat exchanger. The device can realize accurate and stable micro flow control requirements under the condition of a pure gas phase, can meet the requirements on the small flow control under the condition of containing a small amount of liquid drops in the incoming flow, and can work under the condition of relatively high pressure.

Description

【Technical field】 [0001] The invention relates to a small-flow gas control device, especially capable of accurately controlling the gas flow of a pure gas phase or a two-phase flow containing a small amount of liquid in a gas source under the condition of downstream pressure fluctuations. 【Background technique】 [0002] It is often necessary to achieve a stable supply of gas propellants with a small mass flow rate under the condition of downstream pressure fluctuations when carrying out ground tests of micro-propellers for aerospace. Commonly used flow control valves mainly control the flow by adjusting the throttling area. This method is often not easy to accurately adjust the small flow when the throttling area is large, and it often has working pressure when the throttling area is small. Restriction; and the flow control valve cannot isolate the influence of downstream pressure changes, and fluctuations in downstream pressure will cause flow changes. Another way to contr...

AI Technical Summary

Problems solved by technology

[0003] In order to overcome the deficiencies of the existing gas flow control methods in the application of small flow control and flow control under the condition that the incoming flow contains a small amount of liquid, and to ensure that the downstream pressure fluctuations can still provide a stable flow supply, the present invention provides a small flow gas Control device, which can not only realize the small flow control requirements under pure gas phase conditions, but also adapt to the small flow control requirements under the gas source conditions containing a small amount of liquid droplets in the gas, and can provide stable flow under the condition of downstream pressure fluctuations supply

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