[특허]Microminiature stirling cycle cryocoolers and engines

Microminiature stirling cycle cryocoolers and engines 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	F25B-009/00 F01B-029/10 F02G-001/04
출원번호	US-0333356 (1994-11-02)
발명자 / 주소	Bowman Lyn (Athens OH) Berchowitz David M. (Athens OH) Urieli Israel (Athens OH)
출원인 / 주소	Ohio University (Athens OH 02)
인용정보	피인용 횟수 : 21 인용 특허 : 0

초록 ▼

A microminiature Stirling cycle engine or cooler is formed utilizing semiconductor, planar processing techniques. Such a Stirling cycle thermomechanical transducer has silicon end plates and an intermediate regenerator. The end plates are formed with diaphragms and backspaces, one end plate forming the expansion end and the opposite end plate forming the compression end, with the regenerator bonded in between. A control circuit apparatus is linked to the diaphragms for controlling the amplitude, phase and frequency of their deflections. The control circuit apparatus is adapted to operate the transducer above 500 Hz and the passages and the workspace, including those within the regenerator, expansion space and compression space, are sufficiently narrow to provide a characteristic Wolmersley number, which is characteristic of the irreversibilities generated by the oscillating flow of the working fluid in the workspace, below substantially 5 at the operating frequency above 500 Hz. Additionally, the amplitude of the vibrations of the diaphragm vibrations are sufficiently small to provide the working fluid a maximum Mach number below substantially 0.1 at an operating frequency above 500 Hz.

대표청구항 ▼

An improved Stirling cycle thermomechanical transducer having (A) a pressure vessel defining an enclosed work space including fluid passages and containing a working fluid which is compressible and expansible fluid, the pressure vessel comprising: (a) a heat-accepting, fluid-expansion end having (i) an expansion space; (ii) a back space distal to the expansion space; (iii) a flexible expansion diaphragm forming a wall between the expansion space and the back space; and (iv) a heat-accepting heat exchanger proximally bounding the expansion space; and (b) a heat-ejecting, fluid-compression end having (i) a compression space; (ii) a back space distal to the compression (iii) a flexible, compression diaphragm forming a wall between the compression space and the back space; and (iv) a heat-ejecting heat exchanger proximally bounding the compression space; and (c) a heat regenerator interposed between said ends and including a perforate matrix in fluid communication with the expansion space and the compression space; and (B) a control circuit apparatus linked to the diaphragms for controlling the mode, amplitude, phase and frequency of the deflections of the diaphragms which alternately strain to provide periodic variations of the expansion space and compression space volumes and for maintaining a nominal 90°phase lead of the expansion space volume ahead of the compression space volume; wherein the improvement comprises the combination of: the control circuit apparatus being adapted to operate the transducer above 500 Hz; and the passages in the work space being sufficiently narrow to provide a Wolmersley number, which is characteristic of irreversibilities generated by the oscillating flow of the working fluid in the work space, below substantially 5 and the amplitude of diaphragm vibrations are sufficiently small to provide the working fluid a maximum Mach number below substantially 0.1 at an operating frequency above 500 Hz.

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IPC	Description
A	생활필수품
A62	인명구조; 소방(사다리 E06C)
A62B	인명구조용의 기구, 장치 또는 방법(특히 의료용에 사용되는 밸브 A61M 39/00; 특히 물에서 쓰이는 인명구조 장치 또는 방법 B63C 9/00; 잠수장비 B63C 11/00; 특히 항공기에 쓰는 것, 예. 낙하산, 투출좌석 B64D; 특히 광산에서 쓰이는 구조장치 E21F 11/00)
A62B-1/08	.. 윈치 또는 풀리에 제동기구가 있는 것

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Microminiature stirling cycle cryocoolers and engines 원문보기

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Microminiature stirling cycle cryocoolers and engines 원문보기

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