Refrigeration system and oil supply control method, device and controller thereof

Abstract

The present application relates to a refrigeration system and its oil supply control method, device and controller. Wherein, on the basis of the oil supply pipeline including the oil supply solenoid valve in the original refrigeration system, an oil pump is arranged in parallel with the oil supply solenoid valve, and the inlet of the oil pump is connected to the oil supply pipeline on the outlet side of the oil separator. It is connected to each other, and an electric regulating valve is arranged in series between the oil supply solenoid valve and the oil supply port of the compressor, so that the initial oil supply temperature and the oil supply pressure can be increased based on the operation of the oil pump, and the oil supply can be adjusted based on the electric regulating valve. The oil flow in the pipeline is controlled. That is to say, by setting in this way, when supplying oil to the oil-injected screw compressor, the requirement for the pressure difference between the suction and discharge of the compressor can be reduced, that is, the operating range of the compressor under the low suction and discharge pressure difference can be widened, and The actual fuel injection quantity can be controlled.

Description

technical field [0001] The present application relates to the technical field of refrigeration systems, and in particular, to a refrigeration system and an oil supply control method, device and controller thereof. Background technique [0002] For refrigeration systems including oil-injected screw compressors, during use, oil injection (oil supply) needs to be performed on the compressor suction, exhaust, body nozzles, loading and unloading oil circuits, etc. to meet the requirements of the balance piston and bearing. Lubrication, lubricating noise reduction cooling in the rotor cavity, pushing of loading and unloading spool valves. [0003] In the current scheme, fuel injection can only be achieved when the pressure difference between the suction and discharge of the compressor satisfies the conditions. Moreover, it is designed as an unadjustable or limited adjustment of the fuel injection orifice only according to the fuel injection volume (fuel supply volume) that meets ...

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Problems solved by technology

[0005] This application provides a refrigeration system and its oil supply control method, device and controller to solve the problem in the related art that when supplying oil to an oil-injected screw compressor, there is a certain requirement on the suction and exhaust pressure difference of the compressor, and The problem that the actual fuel injection volume cannot be controlled

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