US 12,110,889 B2
Screw compressor
Kotaro Chiba, Tokyo (JP); Masahiko Takano, Tokyo (JP); Shigeyuki Yorikane, Tokyo (JP); Kenji Morita, Tokyo (JP); and Yuta Kajie, Tokyo (JP)
Assigned to Hitachi Industrial Equipment Systems Co., Ltd., Tokyo (JP)
Appl. No. 18/267,289
Filed by Hitachi Industrial Equipment Systems Co., Ltd., Tokyo (JP)
PCT Filed Nov. 12, 2021, PCT No. PCT/JP2021/041804
§ 371(c)(1), (2) Date Jun. 14, 2023,
PCT Pub. No. WO2022/130861, PCT Pub. Date Jun. 23, 2022.
Claims priority of application No. 2020-209862 (JP), filed on Dec. 18, 2020.
Prior Publication US 2024/0052830 A1, Feb. 15, 2024
Int. Cl. F04C 18/16 (2006.01); F04C 2/16 (2006.01); F04C 27/00 (2006.01)
CPC F04C 18/16 (2013.01) [F04C 2/16 (2013.01); F04C 27/005 (2013.01); F04C 2240/20 (2013.01); F04C 2240/30 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A screw compressor comprising:
a male rotor having a first delivery end face on one side in an axial direction of the male rotor;
a female rotor having a second delivery end face on one side in an axial direction of the female rotor; and
a casing having a housing chamber in which the male rotor and the female rotor are rotatably housed in a mutually meshed state, wherein
the casing has a delivery inner wall face that faces the first delivery end face of the male rotor and the second delivery end face of the female rotor,
the delivery inner wall face of the casing has a shield area that shields at least a part of a track of an axial fluid communication path, the axial fluid communication path being a clearance that is periodically generated at the first delivery end face and the second delivery end face according to variation of an intermeshing state between the male rotor and the female rotor upon rotation thereof and that is bounded by trailing flanks of the male rotor and the female rotor,
the shield area of the casing is provided with a groove group comprising a plurality of grooves having longitudinal directions,
the plurality of grooves of the groove group are juxtaposed in a circumferential direction of at least one rotor of the male rotor and the female rotor,
the plurality of grooves of the groove group are arranged such that their sides extending in the longitudinal directions are disposed adjacent to each other, and
each of the plurality of grooves of the groove group is configured such that its longitudinal direction oriented from an inner circumferential side of the one rotor toward an outer circumferential side is inclined with respect to a radial direction of the one rotor in a same direction as a rotational direction of the one rotor.