Kabushiki Kaisha Kobe Seiko Sho

Kobelco Research Institute, Inc.

Katsuyuki Suzuki

Noboru Tsuboi

Masaki Matsukuma

Hideo Utsuno

Yoshitaka Morisawa

A screw compressor to enable prevention of contact between a slide valve and screw rotors. The screw compressor comprising a capacity controlling slide valve 3 provided for advance and (or) retreat through a piston rod 6 by a piston 5 operated by fluid pressure arranged on the discharge side to adjust the size of a diametral opening of screw rotors 1, 2 on the suction side, the screw compressor including projections 8 extending in parallel with axes of the screw rotors 1, 2 from a position distanced from the screw rotors 1, 2 at the end on the suction side of the slide valve 3, and a support portion 10 which comes in relatively slidably contact with surfaces 9 on the axial side of the screw rotors 1, 2 of the projections 8 which advance and retreat along with the slide valve 3 to support the projections 8.

Screw compressor

An oil-cooled type screw compressor capable of improving the oil separating efficiency is provided. The oil-cooled type screw compressor includes an outer casing 21 which encloses at least a bearing portion on a discharge port 12 side of a compressor body 1 in an isolated state from a suction port 11, an oil separating element 22 which comprises an inside portion 22A and an outside portion 22B partitioned from each other by an annular partition plate 26 and which bisects the inside space of the outer casing into a space 27 on the compressor body side and a space 28 on the side opposite to the compressor body, a first discharge pipe 23 which conducts a compressed gas discharged together with oil from the discharge port 12 to the inside portion 22A, a shielding plate 24 for isolating the inside portion 22A from the compressor body-side space 27, and a second discharge pipe 25 extending through both the oil separating element 22 and the portion of the casing 21 which covers the space 28 on the side opposite to the compressor body, to conduct the compressed gas which has entered the compressor body-side space 27 from the opposite-side space 28 to the exterior.

Growing community of inventors

Hyogo, Japan

Katsuyuki Suzuki