Micro flow supply measuring device

Abstract

To realize stable supply and measurement of micro flow, the invention provides a micro flow supply measuring device. The device comprises a constant pressure unit, a supply unit and a measuring unit;the constant pressure unit comprises an automatic pressure regulating device and a constant pressure balancing container; the inlet of the constant pressure balance container is connected with an airsource through the automatic pressure regulating device, and the outlet of the constant pressure balance container is connected with the supply unit; the supply unit comprises a propellant supply container, an electronic scale, a first vibration damping assembly and a supply pipeline, wherein the inlet of the propellant supply container is connected with the outlet of the constant pressure balancecontainer, and the outlet of the propellant supply container is connected with the measuring unit through the supply pipeline; the electronic scale is arranged below the propellant supply container,and the first vibration damping assembly is arranged below the electronic scale; the measuring unit comprises a first capillary tube, a mass flow meter, a second capillary tube and a measuring pipeline, the first capillary tube, the mass flow meter, the second capillary tube and the measuring pipeline are connected in sequence, and a second filter, a second pneumatic control valve and a pneumaticdischarge valve are arranged on the measuring pipeline; and the inlet of the first capillary tube is connected to the supply pipeline.

Description

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

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

Images