Bypass valve control method and device, controller and refrigeration equipment

Abstract

The invention relates to a bypass valve control method and device, a controller and refrigeration equipment. According to the method, based on the current water supply pressure, when it is determined that the opening degree of a bypass valve arranged on a bypass pipe between a freezing water supply main pipe and a freezing water return main pipe does not need to be controlled to be reduced, whether the current return water temperature is larger than a return water temperature set value or not is judged; and when the current return water temperature is larger than the return water temperature set value, a water supply pressure set value is reset to be a larger value, and then when a system operates till the current water supply pressure meets the requirement of the reset water supply pressure set value, the opening degree of the bypass valve is controlled to be increased by the first preset opening degree so that the return water temperature can be reduced. Through the arrangement, a differential pressure balance valve can be fully utilized, so that a differential pressure balance valve not only can balance the flow difference of the system, but also can slow down the fluctuation of the water inlet temperature of a refrigerator, so as to ensure that the water outlet temperature of the refrigerator can meet the requirement, realize stable cold supply of the refrigerating system and realize a pressure and temperature dual-regulation scheme based on the differential pressure balance valve.

Description

technical field [0001] The present application relates to the technical field of refrigeration equipment, in particular to a control method, device, controller and refrigeration equipment for a bypass valve. Background technique [0002] In the chiller refrigeration system, a bypass valve is installed on the bypass pipe between the refrigeration supply and return water main pipes to balance the terminal flow and the cooling station flow. That is to say, the main function of the traditional bypass valve is to balance the system by opening the bypass valve to guide the chilled supply water to flow directly to the chilled return pipe through the bypass pipe when the pressure difference between the chilled water supply pipe and the chilled return pipe is unbalanced. differential pressure. This bypass valve is therefore often referred to as a differential pressure bypass valve. [0003] However, in the prior art, only the differential pressure of the system is adjusted through ...

AI Technical Summary

Problems solved by technology

[0004] The application provides a bypass valve control method, device, controller and refrigeration equipment to solve the problem of insufficient utilization of differential pressure bypass valves in the prior art

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