Rotary compressor, air conditioning system, and control method

By designing channels connecting the high-pressure side and the low-pressure side in the rotor compressor, and using the control of pipelines and valves, the problem of extended start time of the compressor after the air conditioning system is shut down is solved, and a significantly shortened restart time is achieved.

WO2025060123A1 Publication Date: 2025-03-27SHANGHAI HITACHI ELECTRICAL APPLIANCES CO LTD
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Patent Information

Application Number
PCT/CN2023/121634
Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
Priority Date
2023-09-19
Filing Date
2023-09-26
Publication Date
2025-03-27

AI Technical Summary

Technical Problem

After the air conditioning system is shut down, the pressure difference on the high/low air side of the compressor is difficult to reduce rapidly, resulting in the extended start time of the compressor, especially for single-phase fixed-speed rotor compressors, whose motor torque is small, and it usually takes 3 to 5 minutes to restart after shutdown.

Method used

A rotor compressor is designed. By setting channels connecting the high-pressure side and the low-pressure side in the compressor body, the control of pipelines and valves is used to speed up the pressure difference between the high-pressure side and the low-pressure side of the compressor, and shorten the time required for restarting the air conditioner system after shutdown.

Benefits of technology

By accelerating the pressure difference balance between the high-pressure side and the low-pressure side of the compressor, the gas resistance moment at the start-up moment is reduced, and the time for restarting of the air conditioner system after shutdown is shortened, which specifically achieves a significant shortening from 148 seconds to 23 seconds.

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Abstract

A rotary compressor, an air conditioning system, and a control method. The rotary compressor comprises an upper cylinder head (11), a lower cylinder head, and a cylinder (13) between the upper cylinder head (11) and the lower cylinder head, wherein a rotor is provided within the cylinder (13); the upper cylinder head (11) or / and the lower cylinder head is provided with a pressure relief channel (111) in communication with a compression cavity of the cylinder (13); a first end of a tube (9) is connected to the pressure relief channel (111), and a second end of the tube (9) is in communication with an air suction cavity of the cylinder (13) or with a device (2) in communication with the air suction cavity; and a first valve (91) is disposed between the two ends of the tube (9), the first valve (91) being used to block or open the tube (9). The described rotary compressor is provided with a tube which connects a compressor compression cavity and an air suction cavity or device in communication with the air suction cavity; when the rotary compressor stops running, opening a valve that controls the tube allows the pressure difference between a high-pressure side and a low-pressure side of the compressor to be balanced more quickly, thus shortening the time required to restart the rotary compressor after shutdown.
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