A tiny flow supply measuring device

Abstract

In order to realize the stable supply and measurement of tiny flow, the invention provides a tiny flow supply and measurement device. The device includes a constant pressure unit, a supply unit and a measurement unit; the constant pressure unit includes an automatic pressure regulator and a constant pressure balance container; the inlet of the constant pressure balance container is connected to the gas source through the automatic pressure regulator, and the outlet is connected to the supply unit; the supply The unit includes a propellant supply container, an electronic scale, a first damping assembly and a supply pipeline, the inlet of the propellant supply container is connected to the outlet of the constant pressure balance container, and the outlet is connected to the measuring unit through the supply pipeline; the electronic scale is installed on the propulsion Below the agent supply container, the first damping assembly is arranged below the electronic scale; the measuring unit includes a first capillary, a mass flow meter, a second capillary and a measuring pipeline connected in sequence, and a second filter, a second filter, and a measuring pipeline are arranged on the measuring pipeline. A second pneumatic control valve and a pneumatic discharge valve; the inlet of the first capillary is connected with the supply line.

Description

technical field [0001] The invention relates to an attitude control dynamic system test device, in particular to a micro flow supply measurement device. Background technique [0002] The widely used low-power arc-heated anhydrous hydrazine engine on satellites is used for orbit control and attitude adjustment. The thrust level of this type of engine is small, generally tens of millinewtons or hundreds of millinewtons, and the corresponding propellant flow rate is small, generally measured in mg / s. Propellant flow control and measurement is a key technology in the development and application of arc-heated engines with anhydrous hydrazine as propellant. Commonly used liquid flow measurement instruments such as oval gear flowmeters, turbine flowmeters, rotameters, etc., have a relatively large range of flow measurement. At the same time, due to leakage, friction, and the influence of viscosity with temperature changes, it is difficult to meet special requirements. Requirement...

AI Technical Summary

Problems solved by technology

At the same time, this measurement method has extremely high requirements on the accuracy of electronic scales, and the resolution of electronic scales will directly affect the measurement results. However, the current technical conditions of electronic scales are difficult to meet the requirements of large measuring range, high precision and low cost at the same time. In order to ensure The measurement accuracy requires the accuracy of the electronic scale, so the range can only be reduced, which limits the volume of the storage tank, making it only suitable for short-term measurement. For long-term measurement, it is necessary to refill the storage tank repeatedly

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