초록 ▼

In a screw compressor, guide bushings are mounted within bores for the bearings which support rotor shafts for the compressor. First bushings are provided at an inlet casing of the compressor and provide guidance for a slide stop and second bushings are provided in an outlet casing of the compressor

In a screw compressor, guide bushings are mounted within bores for the bearings which support rotor shafts for the compressor. First bushings are provided at an inlet casing of the compressor and provide guidance for a slide stop and second bushings are provided in an outlet casing of the compressor to provide guidance for a slide valve. The bushings are also mounted to the inlet and outlet casings to provide centering for two sections of the compressor rotor housing. In one embodiment the first and second bushings provide guidance for a slide valve.

대표청구항 ▼

1. In a rotary screw compressor having a housing including generally parallel rotor bores which extend from a fluid inlet to a discharge outlet and wherein a pair of rotors having intermeshing lands and grooves are mounted by oppositely oriented rotor shafts which are rotatably supported in bearings

1. In a rotary screw compressor having a housing including generally parallel rotor bores which extend from a fluid inlet to a discharge outlet and wherein a pair of rotors having intermeshing lands and grooves are mounted by oppositely oriented rotor shafts which are rotatably supported in bearings provided in bearing bores adjacent the fluid inlet and discharge outlet, and wherein the compressor capacity is controlled utilizing a slide valve assembly including a slide valve which is moveable in a secondary bore which extends generally parallel to the rotor bores, the slide valve assembly having upper surface portions of a first configuration which surface portions oppose the rotors and wherein means are provided to slidably adjust the position of the slide valve, the improvement comprising; at least two first guide bushings each having an inner annular sleeve and an outer flange, each of said inner sleeves being cooperatively seated in one of the bearing bores adjacent the fluid inlet so as to be in surrounding relationship with the rotor shafts such that said outer flanges extend within the rotor bores, each of said outer flanges having a guide surface of a shape complementary to said first configuration of and engaging the upper surface portions of the slide valve assembly to thereby provide guidance for the slide valve relative to the rotors.