Refrigerant cooling system and method for frequency converter

Abstract

The invention provides a refrigerant cooling system and method for frequency converters, which relate to the technical field of frequency conversion air conditioners, and include: a temperature sensor collects the current temperature of a heat dissipation cold plate; a pressure sensor collects the current pressure in a liquid storage tank; During operation, the first current temperature of the heat dissipation cold plate is obtained, and when the first current temperature is greater than the first preset temperature and the inlet valve is a solenoid valve, the outlet valve and the inlet valve are controlled to open so that the refrigerant flows into the heat dissipation cold plate and the Liquid storage tank; after the refrigerant fills the liquid storage tank, obtain the second current temperature of the heat dissipation cold plate, and when the outlet valve is an electronic expansion valve and the second current temperature is less than or equal to the second preset temperature, based on the current pressure and Preset the pressure, determine the target opening and closing degree, and control the opening of the outlet valve to the target opening and closing degree, which solves the technical problems of high difficulty in controlling the refrigerant cooling system of the existing frequency converter and low service life of the valve.

Description

technical field [0001] The invention relates to the technical field of frequency conversion air conditioners, in particular to a refrigerant cooling system and method for frequency converters. Background technique [0002] Most of the existing solutions are to pass the refrigerant from the outlet of the condenser of the refrigeration system to the inlet of the cold plate, and return to the outlet of the evaporator after cooling the cold plate. An electronic expansion valve is installed at the outlet or inlet of the cold plate, and the pressure and flow of the refrigerant are adjusted by controlling the opening of the electronic expansion valve, thereby controlling the temperature of the cold plate. [0003] When the valve opening is large and the refrigerant flow rate is relatively sufficient, the pressure of the refrigerant determines the phase transition temperature of the refrigerant, which in turn determines the temperature of the cold plate. Adjusting the opening of th...

AI Technical Summary

Problems solved by technology

However, there are many problems in the control of this critical state.

First, when the refrigerant flow is controlled in a critical state, the temperature uniformity on the cold plate is very poor

It is easy to have low temperature at the inlet and high temperature at the outlet. The existing technology can improve this situation by optimizing the design of the flow channel or changing the position of the refrigerant inlet and outlet, but the actual effect is limited.

The second is that the control is difficult. The relationship between temperature and flow near the critical state changes sharply and has strong nonlinearity. It requires high control to adjust to a stable state.

Third, slight fluctuations in calorific value or refrigerant pressure will cause large fluctuations in temperature, which in turn will lead to adjustment of valve opening.

Large temperature fluctuations will increase the thermal shock stress of the heating element and affect the service life. Frequent valve movements will reduce the service life of the valve

[0005] For the above problems, no effective solution has been proposed

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