US 10,947,976 B2Granted

Screw compressor

AssigneeKobe Steel, Ltd.

InventorsYoshio Yano, Toshiyuki Miyatake, Masahiro Kikuchi

Life of this patent

Estimating the term…

Loading patent…

Abstract

The screw compressor includes a first-stage compressor main body and a second-stage compressor main body for compressing fluid with screw rotors, a motor for driving the first-stage compressor main body and the second-stage compressor main body, and a gear box. The gear box is connected to the first-stage compressor main body, the second-stage compressor main body, and the motor; transmits a driving force of the motor to the screw rotors, and includes a first attachment hole for attaching the first-stage compressor main body and a second attachment hole for attaching the second-stage compressor main body; and is provided with an annular rib surrounding both of the first attachment hole and the second attachment hole. In the screw compressor, the vibration of the natural vibration mode which is most burdensome and should be reduced can be efficiently reduced.

Claims11

Dependent claims

A screw compressor comprising:

a first-stage compressor main body and a second-stage compressor main body respectively configured to compress fluid with screw rotors;
an electric motor configured to drive the first-stage compressor main body and the second-stage compressor main body;
and
a gear box connected to the first-stage compressor main body, the second-stage compressor main body, and the electric motor, and configured to transmit a driving force of the electric motor to the screw rotors of the first-stage and second-stage compressor bodies, the gear box including a first attachment hole for attaching the first-stage compressor main body and a second attachment hole for attaching the second-stage compressor main body, and being provided with an annular rib surrounding an entire contour of the first attachment hole and an entire contour of the second attachment hole,
wherein the annular rib includes:
a first rib region being a portion provided around the first attachment hole,
a second rib region being a portion provided around the second attachment hole, and
a third rib region being a region between the first rib region and the second rib region,
wherein a maximum space in a vertical direction between an upper portion and a lower portion of a first rib portion constituting the first rib region is a first space,
wherein a maximum space in a vertical direction between an upper portion and a lower portion of a second rib portion constituting the second rib region is a second space,
wherein a maximum space in a vertical direction between an upper portion and a lower portion of a third rib portion constituting the third rib region is a third space,
wherein the third space is not more than the first space and not more than the second space,
wherein a central upper rib being a rib on an upper side of the third rib portion is arranged above an imaginary center line connecting a center of the first attachment hole and a center of the second attachment hole, and
wherein a central lower rib being a rib on a lower side of the third rib portion is arranged below the imaginary center line, and
wherein the screw compressor further comprises, between the central upper rib and the central lower rib, an additional rib portion extending along the central upper rib or the central lower rib, or extending along the central lower rib within a range of an angle formed between the central upper rib and the central lower rib.

12 more elements

A screw compressor comprising:

a first-stage compressor main body and a second-stage compressor main body respectively configured to compress fluid with screw rotors;
an electric motor configured to drive the first-stage compressor main body and the second-stage compressor main body;
and
a gear box connected to the first-stage compressor main body, the second-stage compressor main body, and the electric motor, and configured to transmit a driving force of the electric motor to the screw rotors of the first-stage and second-stage compressor bodies, the gear box including a first attachment hole for attaching the first-stage compressor main body and a second attachment hole for attaching the second-stage compressor main body, and being provided with an annular rib surrounding an entire contour of the first attachment hole and an entire contour of the second attachment hole,
wherein the annular rib includes:
a first rib region being a portion provided around the first attachment hole,
a second rib region being a portion provided around the second attachment hole, and
a third rib region being a region between the first rib region and the second rib region,
wherein a maximum space in a vertical direction between an upper portion and a lower portion of a first rib portion constituting the first rib region is a first space,
wherein a maximum space in a vertical direction between an upper portion and a lower portion of a second rib portion constituting the second rib region is a second space,
wherein a maximum space in a vertical direction between an upper portion and a lower portion of a third rib portion constituting the third rib region is a third space,
wherein the third space is not more than the first space and not more than the second space,
wherein a central upper rib being a rib on an upper side of the third rib portion is arranged above an imaginary center line connecting a center of the first attachment hole and a center of the second attachment hole, and
wherein a central lower rib being a rib on a lower side of the third rib portion is arranged below the imaginary center line, and
wherein the screw compressor further comprises:
a fourth rib portion connecting a connection portion between the first rib portion and the central upper rib and a connection portion between the first rib portion and the central lower rib,
a fifth rib portion connecting a connection portion between the second rib portion and the central upper rib and a connection portion between the second rib portion and the central lower rib, and
a sixth rib portion connecting an outer periphery of the first attachment hole and the first rib portion or the fourth rib portion.

15 more elements

The screw compressor comprising:

a first-stage compressor main body and a second-stage compressor main body respectively configured to compress fluid with screw rotors;
an electric motor configured to drive the first-stage compressor main body and the second-stage compressor main body;
and
a gear box connected to the first-stage compressor main body, the second-stage compressor main body, and the electric motor, and configured to transmit a driving force of the electric motor to the screw rotors of the first-stage and second-stage compressor bodies, the gear box including a first attachment hole for attaching the first-stage compressor main body and a second attachment hole for attaching the second-stage compressor main body, and being provided with an annular rib surrounding an entire contour of the first attachment hole and an entire contour of the second attachment hole,
wherein the annular rib includes:
a first rib region being a portion provided around the first attachment hole,
a second rib region being a portion provided around the second attachment hole, and
a third rib region being a region between the first rib region and the second rib region,
wherein a maximum space in a vertical direction between an upper portion and a lower portion of a first rib portion constituting the first rib region is a first space,
wherein a maximum space in a vertical direction between an upper portion and a lower portion of a second rib portion constituting the second rib region is a second space,
wherein a maximum space in a vertical direction between an upper portion and a lower portion of a third rib portion constituting the third rib region is a third space,
wherein the third space is not more than the first space and not more than the second space,
wherein a central upper rib being a rib on an upper side of the third rib portion is arranged above an imaginary center line connecting a center of the first attachment hole and a center of the second attachment hole, and
wherein a central lower rib being a rib on a lower side of the third rib portion is arranged below the imaginary center line, and
wherein the screw compressor further comprises:
a fourth rib portion connecting a connection portion between the first rib portion and the central upper rib and a connection portion between the first rib portion and the central lower rib,
a fifth rib portion connecting a connection portion between the second rib portion and the central upper rib and a connection portion between the second rib portion and the central lower rib, and
an additional rib portion connecting an outer periphery of the second attachment hole and the second rib portion or the fifth rib portion.

15 more elements

Dependencies are inferred from the claim text.

Facts

Application: 16/060,065Filed 15 Nov 2016
Priority: JP JP2015-24628117 Dec 2015
Published: US 2018/0355867 A113 Dec 2018
Granted: 16 Mar 2021
Term ends: Not estimatedThe source records don’t support an estimate.

Classification9 codes

F04C 29/005
Driving elements, brakes, couplings, transmissions specially adapted for pumps: means for transmitting movement from the prime mover to driven…
F01C 21/007
Component parts, details or accessories not provided for in groups F01C1/00 - F01C20/00: general arrangements of parts; Frames and supporting elements
F04C 18/16
With toothed rotary pistons: with helical teeth, e.g. chevron-shaped, screw type
F04C 29/0085
Driving elements, brakes, couplings, transmissions specially adapted for pumps: prime movers