Title:
SCREW COMPRESSOR AND REFRIGERATION CYCLE DEVICE
Document Type and Number:
WIPO Patent Application WO/2018/037469
Kind Code:
A1
Abstract:
A screw compressor equipped with: a casing in which is formed a refrigerant liquid flow path through which a refrigerant liquid passes from the outside; a screw rotor on the outer circumferential surface of which multiple screw grooves forming a compression chamber are formed, and which is arranged so as to rotate inside the casing; and a slide valve that is provided between the casing and the screw rotor, and that slides in the direction of the rotary shaft of the screw rotor. The casing and/or the slide valve are provided with an oil injection port for supplying oil to the screw grooves. The slide valve has a refrigerant liquid injection flow path enabling the refrigerant liquid flow path to communicate with the screw grooves, and moves between a first position, in which the refrigerant liquid injection flow path communicates with the screw grooves from immediately before compression to immediately after compression, and a second position, which is a position in which the refrigerant liquid injection flow path communicates with the screw grooves in an intake stroke before compression begins, and the position of the refrigerant liquid injection flow path in the direction of the rotary shaft is closer to the oil injection port than the first position.
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Inventors:
MAEDA KATSUYA (JP)
Application Number:
PCT/JP2016/074443
Publication Date:
March 01, 2018
Filing Date:
August 23, 2016
Export Citation:
Assignee:
MITSUBISHI ELECTRIC CORP (JP)
International Classes:
F04C29/04; F04C18/16; F04C18/52; F04C29/02
Domestic Patent References:
| WO2016084176A1 | 2016-06-02 |
Foreign References:
| JPS5738692A | 1982-03-03 | |||
| JPS5091108U | 1975-08-01 | |||
| US20050226758A1 | 2005-10-13 | |||
| JPS56118988U | 1981-09-10 | |||
| JPS57193086U | 1982-12-07 |
Other References:
See also references of EP 3505765A4
Attorney, Agent or Firm:
KISA PATENT & TRADEMARK FIRM (JP)
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