Device and method for measuring flow of electronic expansion valve

Abstract

The invention discloses a device and a method for measuring the flow of an electronic expansion valve. The method is used for accurately testing the flow of the electronic expansion valve. The device comprises a vertical test board, universal test equipment of horizontal and vertical pipes, an integrative clamp of an electronic expansion valve, an automatic control unit based on an industrial control computer, wherein the universal test equipment of horizontal and vertical pipes is provided with a vertical interface and a horizontal interface and can satisfy the test of a straight-pipe type electronic expansion valve and a bent-pipe type electronic expansion valve, and a bottom flexible pipe can overcome installation errors; and the integrative clamp comprises an air inlet unit and a locking unit which have independent air passages and an integrative structure in order to control different pressures of the clamping air inlet and the test air inlet of the electronic expansion valve. Inthe method for accurately measuring the flow of the electronic expansion valve, pressure sensors are arranged in front and at the rear of the electronic expansion valve, the test pressure difference in front and at the rear of the electronic expansion valve is locked by using an automatic pressure regulating valve, the outlet end of the electronic expansion valve is provided with three flow sensors with three different measuring ranges to realize wide-range high-precision flow measurement, and a table look-up method is used for modifying.

Description

technical field [0001] The invention relates to flow testing equipment, in particular to a flow testing equipment and method for an electronic expansion valve. Background technique [0002] In the refrigeration system, the throttling mechanism, the compressor, the condenser, and the evaporator are called the "four major parts" of the refrigeration system. They are one of the essential components in the refrigeration system. Controls the flow rate of the evaporator refrigerant and the superheat of the evaporator outlet. As a throttling mechanism, the electronic expansion valve is more and more widely used with the increasing popularity of frequency conversion air conditioners. Great advantages. The flow rate of the electronic expansion valve under different opening conditions is an important characteristic, which is directly related to the quality of the refrigeration system. Therefore, the flow rate is a key test index for the qualification of the electronic expansion valv...

AI Technical Summary

Problems solved by technology

However, the technical level of the current electronic expansion valve flow test equipment is relatively low, with shortcomings such as low equipment automation, unreasonable test methods, difficult installation of test pieces, and time-consuming replacement of tooling and fixtures, resulting in inaccurate test results and poor consistency. Accurate flow test It has become a technical bottleneck for electronic expansion valve manufacturers

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