Screw compressor

Patent metadata

Field	Value
Publication number	US-10167868-B2
Application number	US-201515123555-A
Country	US
Kind code	B2
Filing date	Feb 9, 2015
Priority date	Mar 10, 2014
Publication date	Jan 1, 2019
Grant date	Jan 1, 2019

Abstract

A screw compressor includes compressor bodies, a motor disposed in a side of the compressor bodies, a gear box coupled to the compressor bodies and transmitting the drive force of the motor to a screw rotor, and a tubular coupling casing coupling the gear box and the motor and having horizontal axis. The coupling casing has a work hole in the horizontal direction. The work hole is used for maintaining a coupling accommodated in the coupling casing. The coupling casing has a rib extending in the up-down direction. It is thus possible to avoid reduction in the rigidity of the coupling casing with no cost increase, and to improve maintainability.

First claim

The invention claimed is:

1. A screw compressor comprising:
a compressor body compressing a fluid by a screw rotor;
a motor disposed in a side of the compressor body and supplying a drive force to the compressor body;
a gear box coupled to the compressor body and transmitting the drive force of the motor to the screw rotor;
a tubular coupling casing coupling the gear box and the motor and having a horizontal axis;
an input shaft coupled to the shaft of the motor and inputting the drive force of the motor to the gear box;
a coupling accommodated in the coupling casing and coupling the input shaft and the shaft of the motor;
a work hole in the horizontal direction provided in the coupling casing and used for maintaining the coupling; and
a rib provided in the coupling casing and extending in the up-down direction, the rib being a substantially rectangular plate and extending along an entire length of the tubular coupling casing in a horizontal direction.

2. The screw compressor according to claim 1 , further comprising:
the compressor body including a first compressor body and a second compressor body;
a bull gear coupled to the input shaft so as to be accommodated in the gear box;
a first pinion gear accommodated in the gear box, coupled to the shaft of the screw rotor of the first compressor body so that the axis of the first pinion gear is disposed above the axis of the bull gear, and engaging with the bull gear; and
a second pinion gear accommodated in the gear box, coupled to the shaft of the screw rotor of the second compressor body so that the axis of the second pinion gear is disposed above the axis of the bull gear and on the opposite side of the first pinion gear with respect to a vertical line passing through the axis of the bull gear, and engaging with the bull gear.

3. The screw compressor according to claim 1 , wherein:
the coupling casing has a gear box side flange having a coupling face coupling to the gear box at one end in the axial direction, and a motor side flange having a coupling face coupling to the motor at the other end in the axial direction, and
the rib is disposed in the direction orthogonal to the coupling face of the gear box side flange and the coupling face of the motor side flange.

4. The screw compressor according to claim 1 , wherein the rib is disposed on the surface of the coupling casing at a position within 90 degrees about the input shaft from the proximate edge of the work hole.

5. The screw compressor according to claim 1 , wherein the plurality of ribs are provided.

6. The screw compressor according to claim 1 , wherein the projected area of the rib onto an imaginary vertical plane is the same as the projected area of the work hole onto the imaginary vertical plane.

Assignees

• Kobe Steel Ltd

Inventors

• Fukushima Yosuke
• Tsugihashi Kazuki

Classifications

• F04C2240/60

  Shafts · CPC title

• F04C29/005

  Means for transmitting movement from the prime mover to driven parts of the pump, e.g. clutches, couplings, transmissions · CPC title

• F04C18/16 Primary

  with helical teeth, e.g. chevron-shaped, screw type {(for non-parallel axes of movement F04C18/48)} · CPC title

• F04C29/0085

  Prime movers · CPC title

• F04C2240/30

  Casings or housings · CPC title