Title:
OIL-COOLED SCREW COMPRESSOR
Document Type and Number:
WIPO Patent Application WO/2017/183412
Kind Code:
A1
Abstract:
The objective of the present invention is to reduce loss factors that occur inside an oil-cooled screw compressor and to improve energy efficiency. In oil-cooled screw compressors, compression is carried out by reducing the volume of an operation chamber in which a gas to be compressed and an oil are mixed and contained, and when a predetermined rise in pressure is complete, a discharge port opens and the gas to be compressed and the oil are discharged. In the operation chamber, the reduction in volume continues and reaches zero, such that the operation chamber disappears, and the opening area of the discharge port also gradually decreases. Immediately before the operation chamber disappears, the ratio of the oil within the operation chamber is high and the opening area of the discharge port is small. Therefore, the discharge resistance increases and the internal pressure dramatically rises, and this has led to increases in the torque rotating the rotor. Thus, in the present invention, a tooth crest arc of a fixed width is provided to the tooth crest of a male tooth profile, and simultaneously a tooth bottom arc is provided to the tooth bottom of a female tooth profile. Due to the actions thereof, the operation chamber immediately before disappearing exists only in a bottom half region from a line that connects the centers of the male and female tooth profiles, and the opening area relative to the volume of the operation chamber can be increased. As a result, the discharge of oil becomes smooth and energy loss is reduced.
Inventors:
KAMEYA HIROTAKA (JP)
TANAKA HIDEHARU (JP)
TAKANO MASAHIKO (JP)
TSUCHIYA TAKESHI (JP)
TANAKA HIDEHARU (JP)
TAKANO MASAHIKO (JP)
TSUCHIYA TAKESHI (JP)
Application Number:
PCT/JP2017/013297
Publication Date:
October 26, 2017
Filing Date:
March 30, 2017
Export Citation:
Assignee:
HITACHI INDUSTRY EQUIPMENT SYSTEMS CO LTD (JP)
International Classes:
F04C29/00; F04C18/16
Foreign References:
| JPS49105748U | 1974-09-10 | |||
| JP2005315149A | 2005-11-10 | |||
| JP2008133763A | 2008-06-12 | |||
| JPH02252991A | 1990-10-11 |
Attorney, Agent or Firm:
SEIRYO I.P.C. (JP)
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