The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 29, 2003
Filed:
Aug. 09, 2001
Junichiro Totsuka, Kako-gun, JP;
Kabushiki Kaisha Kobe Seiko Sho, Kobe, JP;
Abstract
A compressor that enables the increase of compression efficiency, the prevention of abnormal temperature rising in the discharge, and the reduction of power loss, includes a compressor body an intake registration valve in the inlet side, and a pressure sensor provided in the discharge side to be able to detect pressure. A control section outputs a control signal for controlling the rotational speed of a motor for driving the compressor body based on a pressure signal indicating a detected pressure from the pressure sensor when the rotational speed is higher than a predetermined value, the intake regulation valve is opened and a control signal for negating a deviation of the detected pressure to the predetermined target pressure is outputted from the control section thereby controlling the rotational speed, and when the rotational speed is reached to the predetermined value, the control is switched to the open/close control for opening/closing the intake regulation valve in response to a pressure fluctuation in the discharge side in place of the rotational speed control, thereby controlling pressure fluctuation in the discharge side. Here, the predetermined value is set to such a value that the leakage quantity of gas, compressed by the screw compressor, into the inlet side of the screw compressor will not be increased as rotational speed of the motor is decreased.