Bypass valve control method, device, controller and refrigeration equipment

Abstract

The application relates to a control method, device, controller and refrigeration equipment of a bypass valve. In the method, based on the current water supply pressure, when it is determined that there is no need to control the opening of the bypass valve on the bypass pipe between the frozen water supply main pipe and the frozen return water main pipe to reduce, it is judged whether the current return water temperature is greater than the return water temperature. temperature setting value; and when the current return water temperature is greater than the return water temperature setting value, reset the water supply pressure setting value to a larger value, and then when the system runs until the current water supply pressure meets the reset water supply pressure When the pressure setting value is required, the opening degree of the bypass valve is controlled to increase the first preset opening degree, so that the temperature of the return water is reduced. Such setting can make full use of the differential pressure balance valve, so that the differential pressure balance valve can not only balance the flow difference of the system, but also slow down the temperature fluctuation of the inlet water of the chiller, so as to ensure that the outlet water temperature of the chiller can meet the requirements, and realize the stable cooling of the refrigeration system , Realize the dual regulation scheme of pressure and temperature based on differential pressure balance valve.

Description

technical field [0001] The present application relates to the technical field of refrigeration equipment, and in particular, to a control method, device, controller and refrigeration equipment for a bypass valve. Background technique [0002] In the refrigeration system of the chiller, a bypass valve is installed on the bypass pipe between the refrigeration supply and return water main pipes to balance the flow at the end and the flow in the cooling station. That is, the main function of the traditional bypass valve is to balance the system by opening the bypass valve to guide the chilled water supply 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 system pressure difference is adjusted thr...

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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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