Fuzzy control system and method of throttle mechanism

Abstract

The invention discloses a fuzzy control system and a method of a throttle mechanism. According to the invention, a refrigeration cycle system comprises a compressor, a condenser and an evaporator. The control method comprises the following steps: monitoring the refrigerant vaporization temperature and water supply fluid temperature of the evaporator, and defining the small temperature difference of the evaporator as the temperature difference of subtracting the refrigerant vaporization temperature from the water supply fluid temperature; monitoring the temperature and the saturation temperature of the refrigerant discharged by the condenser, and defining the condenser depression of the refrigerant discharged by the condenser as the difference of subtracting the refrigerant temperature from the refrigerant saturation temperature; and calculating the opening of the throttling orifice of an electronic expansion valve by utilizing the small temperature difference of the evaporator and the condenser depression of the refrigerant discharged by the condenser. The method and the device of the invention can solve the problem of failure to realize stable and precise regulation on the opening of the electronic expansion valve due to the unstable liquid level signals of the evaporator in the prior art.

Description

technical field [0001] The invention relates to a refrigeration system including a screw compressor and an electronic expansion valve as a throttling mechanism, in particular to a device and a method for adjusting the opening degree of the electronic expansion valve in the refrigeration system. Background technique [0002] The principle of the refrigeration system is: the refrigeration system works in a high temperature environment and a low temperature environment. In the refrigeration cycle system, the refrigerant circulates to discharge the heat in the low temperature environment to the high temperature environment. In the heat pump cycle system, the refrigerant circulates to discharge the heat from the low temperature environment. The low-grade heat in the medium is converted into high-grade heat together with the input power and discharged into the high-temperature environment. [0003] figure 1 The basic structure of the existing refrigeration system is shown. The r...

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Problems solved by technology

However, in practice, since what enters the evaporator is a mixture of gas and liquid refrigerant that accounts for about 20% of the gas mass component, when in contact with the heat exchange tube, it exchanges heat with the fluid in the tube, and the surface of the heat exchange tube wall forms Nucleate boiling bubbles, so the entire cylinder of the evaporator is in a state of violent boiling, which causes the output of the liquid level signal to be relatively violent and therefore very unstable, which in turn makes it impossible to achieve stable and accurate control of the opening of the electronic expansion valve. adjust

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