Title:
OIL-COOLED SCREW COMPRESSOR
Document Type and Number:
WIPO Patent Application WO/2020/235338
Kind Code:
A1
Abstract:
This oil-cooled screw compressor 1 is provided with an auxiliary oil supply flow path 31 which fluidly connects a rotor chamber 21c with a primary oil supply flow path 11 or an oil reservoir 4a of an oil separation recovery device 4, and which guides into the rotor chamber 2c oil in the oil reservoir 4a by means of the difference in pressure between inside the rotor chamber 2c and the pressurized air discharged from the compressor main body 2. The auxiliary oil supply flow path 31 is provided with an oil flow control unit 32 which can switch between a first state which blocks or restricts the flow of oil through the auxiliary oil supply flow path 31 and a second state which permits or relaxes restriction on the flow of oil through the auxiliary oil supply flow path 31. The control device 100 switches the oil flow control unit 32 from the first state to the second state if the pressure detected by a pressure detection unit 42 falls to less than or equal to a threshold pressure and the rotation speed of the compressor main body 2 falls to less than or equal to a threshold rotation speed.
Inventors:
YAKUBO SHUTO
HOSHIKAWA AKIRA
HOSHIKAWA AKIRA
Application Number:
PCT/JP2020/018459
Publication Date:
November 26, 2020
Filing Date:
May 01, 2020
Export Citation:
Assignee:
KOBE STEEL LTD (JP)
International Classes:
F04C29/02; F04B39/02; F04B39/06
Foreign References:
| JP2008128085A | 2008-06-05 | |||
| JP2008115769A | 2008-05-22 | |||
| JP2015078607A | 2015-04-23 | |||
| JP2000073950A | 2000-03-07 |
Attorney, Agent or Firm:
YAMAO, Norihito et al. (JP)
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