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:
Apr. 01, 1997
Filed:
Jun. 05, 1995
Tetsuya Honda, Hyogo, JP;
Kazuhiko Kawajiri, Hyogo, JP;
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Abstract
A free-piston Vuilleumier heat pump in which displacers having a spring-operated resonance system, controls the heating energy and cooling energy outputs by controlling strokes of a hot displacer and a cold displacer. The control of the displacer strokes is performed by controlling the working gas temperature in a hot working space. Furthermore, the control of the displacer strokes may be performed by controlling a motor output while keeping the operation frequency of the motor mounted for at least one of the hot displacer and the cold displacer, in the vicinity of a resonance frequency which is determined by the driving system of the hot displacer and the cold displacer. Even in the free-piston Vuilleumier heat pump using the spring-operated resonance system thus constituted for reciprocating motion, a fine output adjustment is carried out in accordance with heating and cooling loads and therefore it is possible to control to change the working gas temperature in the high-temperature section, thus obtaining a stable operating condition and a high coefficient of performance (COP).