[특허]Method and apparatus for electronic leak testing

Method and apparatus for electronic leak testing 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	G01M-003/02 G06F-015/20
출원번호	US-0330384 (1981-12-14)
발명자 / 주소	Converse III Vernon G. (Franklin MI) Bordato James M. (Grosse Pointe Wds. MI) Bott Theodore R. (Berkley MI) Foerster Jr. Charles E. (Northville MI) Herbst Jr. Desra N. (Spring Valley OH) Mudge
출원인 / 주소	Scans Associates, Inc. (Livonia MI 02)
인용정보	피인용 횟수 : 42 인용 특허 : 0

초록 ▼

The specification discloses an electronic dynamic balance leak testing system utilizing a “live zero”, wherein a source of test medium at a predetermined desired pressure or vacuum is connected to a part to be tested, and after the part is filled with the test medium, and an interval is provided for the system to stabilize the affects due to wave front oscillations, the test part is momentarily isolated from said test media and a microcomputer system is utilized, both to cause said isolation, and to measure the differential pressure existing at two points during the test. In a modification of our system which can dynamically project leak and accept or reject parts much sooner because of this projection feature, the rate of change of the differential pressure transducer is examined and is compared to a curve which is characteristic of the rate of change of a volume which is experiencing a predominately leak based change of pressure. When the rate of change is determined to be predominately a leak based change, the rate of change is determined to be a “Qualified Leak”or a qualified curve. In this case, after a predetermined sample time elapses from the point at which the curve was qualified, a reading of leakage is taken, such reading is then extrapolated to a full test time reading and compared to limits to see if a part is to be accepted or rejected.

대표청구항 ▼

A method of leak testing a part using a selected test medium from a selected source comprising the steps of: (a) subjecting the part to a predetermined test medium pressure; (b) isolating the part from the source of selected test medium while continuing to subject the part to pressure; (c) sensing a first differential pressure between a pressure at the source of the test medium and a pressure at the part being tested; (d) waiting a selected time interval; (e) sensing a second differential pressure between the pressure at the source of the test medium and the pressure at the part being tested; (f) determining the magnitude of any change between the first and second sensed pressure differentials; (g) comparing the magnitude of the change between the first and second sensed differential pressures to a predetermined value; and (h) accepting or rejecting the part based on the results of comparing the magnitude of the change between the first and second differential pressures to the predetermined value.

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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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연합인증

Method and apparatus for electronic leak testing 원문보기

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Method and apparatus for electronic leak testing 원문보기

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