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:
May. 02, 1989
Filed:
May. 27, 1987
Nobuo Okumura, Toyota, JP;
Aisin Seiki Kabushiki Kaisha, Kariya, JP;
Abstract
A cryogenic refrigerator has a working chamber defined between a cylinder and a piston received therein. The working chamber is alternately communicated with discharge and suction ports of a compressor to thereby cause a refrigerant to be repeatedly compressed and expanded. The refrigerator is provided with a sensor for detecting the pressure of the refrigerant discharged from the discharge port of the compressor. A microcomputer is connected to the sensor for making comparison between the detected pressure of the refrigerant, which is received in the form of an electric signal, and a reference value. The refrigerator is further provided with a driver circuit for controlling the drive of the motor in accordance with the result of the comparison. Accordingly, when the pressure of the refrigerant is high at the time of starting the cryogenic refrigerator, the microcomputer instructs the driver circuit to rotate a motor at high speed. Thus, the reciprocating cycle of the piston driven by the motor is quickened, so that it is possible to bring the refrigerator into a stable or stationary operation state in a relatively short period of time.