High/low-voltage and temperature adjustable laminar flow meter testing device

Abstract

The invention relates to a high/low-voltage and temperature adjustable laminar flow meter testing device. The laminar flow meter testing device comprises a high-pressure air inlet system, a working cavity, a laminar flow meter testing section, an air outlet system and an intelligent control system. The high-pressure air inlet system comprises a high-pressure air source, an electromagnetic valve, a sonic nozzle, a high-pressure air chamber, a heating element and a temperature and pressure sensor. The working cavity comprises a pressure stabilized air chamber, a heating element and a temperature and pressure sensor. The laminar flow meter testing section comprises a laminar flow meter to be tested and a differential pressure sensor. The air outlet system comprises two sonic nozzles, an air outlet chamber and a vacuum pump. The intelligent control system completes signal collection and instruction sending of the whole system. Based on the critical flow effect and the mass conservation principle, stable, continuous and adjustable temperature and pressure are achieved. The device can be used for researching and analyzing the performance of a laminar flow meter under different pressure and temperature conditions and analyzing the influence of the temperature and the pressure on the performance of the laminar flow meter, and is easy and convenient to operate.

Description

technical field [0001] The invention relates to an adjustable pressure device, in particular to a laminar flow meter test device with adjustable high and low pressure and temperature based on the critical flow effect and the law of mass conservation. Background technique [0002] Laminar flowmeter is a differential pressure flowmeter composed of a laminar flow sensor and a differential pressure gauge. It is an instrument that measures flow by measuring the differential pressure at both ends of the sensor. It is generally used to measure the flow of micro flow and high viscosity fluids. [0003] Laminar flow meters are widely used in the internal combustion engine industry and aerospace fields. They are not only used to measure pulsating intake air flow, but also the core component of the concentration detection method-based on the differential pressure principle of aircraft fire extinguishing agent concentration measurement equipment. The current research on laminar flow met...

AI Technical Summary

Problems solved by technology

However, on the one hand, the existing pressure regulating device is complicated and costly, and it is only for high pressure or low pressure regulation, and cannot realize continuous adjustment from high pressure to low pressure; on the other hand, as the core component of the aircraft fire extinguishing agent concentration measurement equipment, It is necessary to analyze its performance at different temperatures, and the existing pressure regulating device does not have the ability to regulate temperature; the invention patent with the publication number CN111735520A discloses a gas flow standard device and calibration method with high and low pressure dual calibration sections, but the high pressure section It is tested independently from the low-pressure section, and cannot realize continuous adjustment from high pressure to low pressure, and does not have the ability to test and analyze at different temperatures; in addition, most of them are for air and a single gas. For the measurement of aircraft fire extinguishing agent concentration, It is necessary to analyze the situation of different types and concentrations of aircraft fire extinguishing agents, but the existing device cannot realize the pressure adjustment under different gas types and different gas concentrations

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