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Title:
OIL-FREE SCREW COMPRESSOR
Document Type and Number:
Japanese Patent JP2016070145
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To provide an oil-free screw compressor for reducing a pressure loss at an annular space communicating an atmosphere releasing hole with a communication hole and preventing lubricant oil from flowing into it during unloading time.SOLUTION: This invention comprises a casing 12 having a rotor chamber; a bearing for supporting a rotary shaft 21 of a screw rotor; a shaft seal unit having an oil seal part 31 and an air seal part; an atmosphere releasing hole 24a formed at the shaft seal unit; at least one communicating hole 31a formed at the rotary shaft; and an annular space 25 communicating between the atmosphere releasing hole and at least one communication hole. The annular space comprises an inner peripheral annular space 24g formed at the inner peripheral side of the casing. This invention satisfies the relation where, S1 is an opening section of the inner peripheral annular space, S2 is a total opening section of the communication hole, S2i is an opening section of the i-th hole of the communication holes, [n] is the number of communication holes [n denotes a natural number more than 1].SELECTED DRAWING: Figure 6

Inventors:
YANO NORIO
MIYATAKE TOSHIYUKI
Application Number:
JP2014198966A
Publication Date:
May 09, 2016
Filing Date:
September 29, 2014
Export Citation:
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Assignee:
KOBE STEEL LTD
International Classes:
F04C18/16; F04B39/00; F04C27/00; F16J15/16; F16J15/40
Domestic Patent References:
JPH03110138U1991-11-12
JP2002276574A2002-09-25
JPS5951190A1984-03-24
JPH03110138U1991-11-12
JP2002276574A2002-09-25
JPS5951190A1984-03-24
Attorney, Agent or Firm:
Mitsuo Tanaka
Takuji Yamada
Yoshiyuki Maebori