Control system of waste heat recovery type oil-injected screw compressor and control method thereof

Abstract

The invention provides a control system of a waste heat recovery type oil-injected screw compressor and a control method thereof. With high degree of automation and good cooling effect, the real-timemonitoring of various cooling equipment can be realized. The control system comprises a CPU controller U1, which is connected with a power module, and the power module comprises a compressor main motor, a working medium pump, a condensing fan and an expanded oil pump, wherein the working medium pump is used for driving the working medium in a working medium liquid storage tank to flow, and the compressor main motor is used for driving the compressor; the control system further comprises a detection module, and the detection module comprises a pressure transmitter, a liquid level remote transmitter, flow remote transmitters, a temperature sensor, the compressor, the working medium liquid storage tank and an evaporator; the pressure transmitter, the liquid level remote transmitter and the temperature sensor are installed in an expander, the flow remote transmitters are installed at the outlet ends of the compressor, the working medium liquid storage tank, the evaporator and the expander,and the above control system is applied to control the cooling system of the oil-injected screw compressor.

Description

technical field [0001] The invention relates to the technical field of oil-injected screw compressors, in particular to a waste heat expansion power recovery type oil-injected screw compressor control system. Background technique [0002] The oil-injected screw compressor lubricates and cools the high-speed rotor through the lubrication and cooling effect of oil. The oil and compressed gas inside the traditional oil-injected screw compressor are cooled by fans or water, and the cooling effect is poor. Moreover, the wind energy generated by the fan is not easy to recycle, resulting in unnecessary waste of energy. The prior art provides a device that uses the heat absorption of the working fluid to cool the oil and compressed gas, which can solve the above-mentioned problem of poor cooling effect , but the structure of the existing control system for the compressor is relatively complex, and the degree of automation is relatively low. It is realized by setting thermometers, p...

AI Technical Summary

Problems solved by technology

[0003] In view of the complex structure and low degree of automation of the waste heat expansion power recovery type oil-injected screw compressor control system in the prior art, human eyes observe the readings of various testing equipment such as thermometers, pressure gauges, and flow meters to control the startup of the compressor. Stop operation, prone to misreadings or untimely start-stop operation, leading to the problem that the compressor cannot be shut down in time, and the problem of large energy consumption and easy waste of resources. The invention provides a waste heat expansion power recovery type fuel injection The screw compressor control system has a high degree of automation and good cooling effect, and can realize real-time monitoring of various cooling equipment, which can reduce energy consumption and save resources

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