Package-type air-cooled screw compressor having a cooling air exhaust opening in the package with a duct extended downward with a lower-end inlet placed not viewable from the center position of the compressor

Patent metadata

Field	Value
Publication number	US-10920779-B2
Application number	US-201615740289-A
Country	US
Kind code	B2
Filing date	Jun 7, 2016
Priority date	Jul 3, 2015
Publication date	Feb 16, 2021
Grant date	Feb 16, 2021

Abstract

A package-type air-cooled screw compressor has a compressor body relating to an air-cooled screw compressor, a drive motor, a package that houses the compressor body and the drive motor, an intake opening that takes in an air that cools the compressor body and the drive motor, an exhaust opening that exhausts the air, a duct extended downward from the exhaust opening, to transport the air to the exhaust opening, and an exhaust fan that exhausts the air. A lower end of a wall face constituting the duct is extended downward so that a lower-end inlet of the duct is placed at a position not viewable from a center position of the compressor body.

First claim

The invention claimed is:

1. A package-type air-cooled screw compressor comprising:
a compressor body equipped with a screw rotor for compression;
a drive motor that drives the screw compressor;
a package that houses the compressor body and the drive motor;
an intake opening formed in the package, for taking in an air that cools the compressor body and the drive motor;
an exhaust opening formed in an upper section of the package, to exhaust the air after the cooling of the compressor body and the drive motor;
a duct extended downward from the exhaust opening to a lower-end inlet that opens at least downward, to transport the air after the cooling of the compressor body and the drive motor to the exhaust opening; and
an exhaust fan that exhausts the air after the cooling of the compressor body and the drive motor, wherein
the duct includes a front wall, a rear wall, and one or more side walls, the front wall being a wall of the duct positioned closer to the compressor as compared to the rear wall and is extended downward beyond a bottom edge of the rear wall so that the lower end inlet of the duct is placed at a position not viewable from a center position of the compressor body, and
the compressor body and the drive motor are coaxially connected and disposed in a bottom section of the package.

2. The package-type air-cooled screw compressor according to claim 1 , wherein
a lower end of the front wall of the duct is extended downward so that the lower-end inlet is not viewable from both the center position of the compressor body and a center position of the drive motor.

3. The package-type air-cooled screw compressor according to claim 1 , wherein
the screw compressor is composed of a plurality of compressors, and
a lower end of the front wall of the duct is extended downward so that the lower end inlet is not viewable from a center position of a lowest compressor among the plurality of compressors.

4. The package-type air-cooled screw compressor according to claim 1 , wherein
the screw compressor comprises an air intake port that sucks in an air for compression, and
the air intake port is disposed at a position not capable of viewing the lower end inlet of the duct.

5. The package-type air-cooled screw compressor according to claim 4 , wherein
the intake opening comprises a first intake opening that takes in the cooling air that mainly cools the compressor body and the air for compression to be sucked into the compressor body, and
the air intake port is provided in a middle of a flow of the cooling air flowing from the first intake opening to the compressor body.

6. The package-type air-cooled screw compressor according to claim 5 , wherein
the first intake opening is formed at a position above the air intake port and the compressor body.

7. The package-type air-cooled screw compressor according to claim 1 , wherein
a turbo fan is used as the exhaust fan,
the duct comprises an exhaust duct on a blowing side of the turbo fan, being provided between the turbo fan and the exhaust opening, and an intake duct on an intake side of the turbo fan, having a cross-sectional area smaller than that of the exhaust duct, and
the lower end inlet of the duct is a lower end inlet of the intake duct.

8. The package-type air-cooled screw compressor according to claim 1 , wherein
a lower end of the wall constituting the duct extends downward only to a position on a horizontal plane passing through the center axis of the screw rotor.

Assignees

• Kobe Steel Ltd

Inventors

• Tsugihashi Kazuki

Classifications

• F04C29/04 Primary

  Heating; Cooling (of machines or engines in general F01P); Heat insulation (heat insulation in general F16L59/00) · CPC title

• F04C29/066

  with means to enclose the source of noise · CPC title

• F04C29/063

  Sound absorbing materials · CPC title

• F04C29/0085

  Prime movers · CPC title

• F04C2240/40

  Electric motor · CPC title