Screw compressor, control method thereof and air conditioning equipment

Abstract

The invention relates to a screw compressor, a control method thereof and air conditioning equipment. The screw compressor comprises a machine body and a slide valve, the exhaust end of the slide valve is provided with a first exhaust port, and the exhaust end of the slide valve cavity of the machine body is provided with a second exhaust port. The exhaust port is formed in the machine body while the exhaust port is formed in the sliding valve, and the first exhaust port and the second exhaust port are communicated in the initial state that the exhaust end of the sliding valve slides to the exhaust end of the sliding valve cavity, so that the initial exhaust area of the exhaust ports is increased, the flow loss in the initial exhaust period is reduced, and the power consumption of the compressor is reduced. The control method comprises the steps that the slide valve is moved to change the position of an exhaust port of the slide valve, the internal compression final pressure is made to be equivalent to the condensation pressure, then the tooth space pressure of the tail section in the exhaust process is made to be equivalent to the condensation pressure, and the compressor operates in a high-efficiency area; meanwhile, the pressures of monitoring points of the slide valve at different positions are compared to judge whether the slide valve normally moves, the slide valve jamming fault is found in time, and long-term low-efficiency operation of equipment is avoided.

Description

technical field [0001] The present disclosure relates to a screw compressor, a control method thereof, and an air conditioner. Background technique [0002] The statements herein merely provide background information related to the present disclosure and may not necessarily constitute prior art. [0003] The vapor compression refrigeration system mainly includes four major components: evaporator, condenser, throttling element and refrigeration compressor. First, the refrigerant boils and evaporates in the evaporator to form refrigerant vapor. The refrigeration compressor sucks the low-pressure refrigerant vapor from the evaporator, compresses it to form a high-pressure gas, and discharges it into the condenser. In the condenser, it exchanges heat with the outside and condenses to form a high-pressure liquid. , Through the adiabatic depressurization process of the throttling element, the low-pressure gas-liquid two-phase refrigerant enters the evaporator, boils and evaporate...

AI Technical Summary

Problems solved by technology

[0008] When the interdental volume is connected to the exhaust port, the area of ​​the exhaust port is very small, and the gas in the interdental volume cannot flow into the exhaust chamber in time, so that the internal pressure of the interdental volume continues to rise, resulting in more energy loss

[0009] When the compressor adopts the internal volume ratio adjustment slide valve to adjust the position of the compressor exhaust port, the exhaust orifice is usually set on the slide valve. Due to the size of the slide valve, the exhaust orifice cannot extend to the rotor cavity area of ​​the body, resulting in When the compressor exhausts, the area of ​​the radial exhaust port decreases, the throttling loss and flow loss in the exhaust process increase, and the power consumption of the compressor increases accordingly

[0010] When the compressor operates in different working conditions, the position of the exhaust port is advanced by adjusting the internal volume ratio of the slide valve, so that the pressure at the end of the internal compression is equal to the exhaust pressure, but at the beginning of the exhaust, the area of ​​the exhaust port is small and the exhaust continues If the time is prolonged, the inter-tooth volume will increase significantly, and the power consumption of the compressor will increase accordingly.

[0011] In addition, since the actual operating status of the internal volume adjustment slide valve is difficult to monitor in real time, if the driving internal volume adjustment slide valve mechanism fails, the failure cannot be reported immediately, resulting in long-term inefficient operation of the compressor

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