US 9,752,582 B2 · Oil free screw compressor

Abstract

Provided is a highly reliable oil free screw compressor including a first sensor for detecting a temperature of lubrication oil, second sensors for detecting temperatures of intake air, and a cooling fan controller having a storage portion storing therein a set temperature of lubrication oil and a set temperature of intake air, and a computing portion for computing a control signal for increasing the speed of the cooling fan if a detected value of a temperature of the lubrication oil, delivered from the first sensor, becomes higher than the set value of lubrication oil stored in the storage portion, and computing a control signal for increasing the speed of the cooling fan if a detected value of a temperature of the intake air, delivered from the second sensor, becomes higher than the set temperature of the intake air, stored in the storage portion.

Claims12

Dependent claims

An oil free compressor comprising:

a compressor body configured to compress intake air,
a compressor housing,
a compressed air discharge line provided in the compressor housing configured to discharge compressed air,
a lubrication oil pipe line configured to flow lubrication oil,
an air cooler configured to cool the compressed air flowing in the compressed air discharge line,
an oil cooler configured to cool the lubrication oil flowing in the lubrication oil pipe line,
a cooling fan configured to flow cooling air into the oil cooler and the air cooler,
a cooling fan controller configured to:
increase the rotating speed of the cooling fan if a temperature of the lubrication oil becomes higher than a predetermined temperature, and
increase the rotating speed of the cooling fan if a temperature of the intake air becomes higher than a predetermined temperature.

7 more elements

Dependencies are inferred from the claim text.

Facts

Application

15/186,775Filed 20 Jun 2016 · continuation

Priority

JP 2007-1754123 Jul 2007

Published

US 2016/0298629 A113 Oct 2016

Granted

5 Sep 2017

Term ends

Not estimatedThe source records don’t support an estimate.

Classification10 codes

F04C 29/04
Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00: heating; Cooling ;…
F04C 18/16
With toothed rotary pistons: with helical teeth, e.g. chevron-shaped, screw type
F04C 29/02
Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00: lubrication ;…
F04C 29/12
Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00: arrangements for…

Family

Application12/166,347Parent of this continuation · filed 2 Jul 2008

US 2016/0298629 A1Pre-grant publication · published 13 Oct 2016

US 9,394,906 B2Parent of this continuation

US 2009/0016921 A1Published application

US 9,752,582 B2This patent

From the US filing history. Foreign family members aren’t listed.

Oil free screw compressor

Life of this patent

Oil free screw compressor

Life of this patent

Abstract

Claims12