[특허]Low cost versatile pressure transducer

[미국특허] Low cost versatile pressure transducer 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	G01L-009/12
출원번호	US-0019595 (1993-02-19)
발명자 / 주소	Park Kyong M. (Thousand Oaks CA) Tirmizi Abrar A. (Simi Valley CA)
출원인 / 주소	Kavlico Corporation (Moorpark CA 02)
인용정보	피인용 횟수 : 43 인용 특허 : 0

초록 ▼

A versatile low cost capacitive type of electrical pressure transducer includes a sensor module providing an output signal indicative of fluid pressure effective thereon, and an elongate cylindrical housing receiving the module and providing for communication thereto of a first fluid pressure (which may have a high pressure level), and of a second fluid pressure (which may range from a vacuum through atmospheric pressure to a pressure level of a few hundred pounds). Consequently the transducer may operate as a gauge pressure sensor or as a differential pressure sensor. Alternatively, other types of sensor modules may also be employed in housings of the same or substantially the same design to fulfill other types of pressure measurement tasks. The commonality of component parts of the various sensors contributes to a reduces cost. Also, the components of the housing are economical to manufacture and assemble, and provide for testing and calibration of the sensors at an intermediate step of manufacture. Thus, further cost savings are realized. The housing provides for electrical shielding of the sensor module from electromagnetic and radio frequency interference, as well as filtering power surges and higher frequency noise. Accuracy and service life of the transducers are thus improved. A connector portion of the housing is secured by a tubular portion thereof by means of low cost rolling operations, and also provides a second source of support to the sensor module in resisting displacement in the housing caused by high fluid pressures. As a result an inexpensive pressure transducer is realized which is applicable to measurement of rather high fluid pressures.

대표청구항 ▼

A versatile low-cost gauge or differential pressure transducer usable at high pressures, said pressure transducer comprising: a cup-shaped electrically conductive and high strength high-pressure fitting member having an integral end wall and side wall cooperatively defining a cavity, said side wall defining an axial opening to said cavity, and said end wall outwardly defining an axial boss portion with a nipple for connection of said transducer to a first source of pressurized fluid, inwardly said end wall defining a conical recess circumscribed by a sealing feature for sealing cooperation with a pressure sensor module receivable into said cavity, and a passage communicating said nipple with said conical recess; a pressure sensor module including a disk-like substrate portion on one side thereof sealingly carrying a disk-like diaphragm portion cooperating with said substrate portion to define an internal chamber, said diaphragm portion outwardly defining an axial pressure-responsive face for said pressure sensor module, said diaphragm portion and said substrate portion each carrying respective conductive coatings in said internal chamber which coatings cooperatively define a variable capacitor varying in capacitance in response to pressurized fluid effective upon said diaphragm portion, said substrate portion on the other side thereof carrying a hybrid integrated circuit electrically responsive to changes in said variable capacitor to provide an output signal indicative of a pressure level of said pressurized fluid effective on said diaphragm portion, said pressure sensor module being received into said cavity and at said pressure-responsive face thereof sealingly cooperating with said sealing feature of said end wall to bound a high-pressure chamber in said recess; a cup-shaped spacer member received into said cavity and defining a respective cavity axially receiving said pressure sensor module with said pressure-responsive face disposed away from a respective end wall of said spacer member, said cup-shaped spacer member being disposed oppositely to said cup-shaped fitting member to capture said sensor module between the respective end walls of each and to urge said module sealingly into engagement with said sealing feature; said side wall of said high-pressure fitting member defining a radially inwardly extending lip portion defining said opening to said cavity and forcefully cooperating with said spacer member to urge both the latter toward said end wall and said pressure sensor module into sealing engagement with said sealing feature; electrically conductive plate means at said opening to said high-pressure fitting member for on the one hand closing said opening and on the other hand for connecting said output signal therethrough externally of said cavity; an electrical connector member axially juxtaposed with said high-pressure fitting member at said opening thereof and including an axial surface engaging said lip portion, said connector member including electrical connectors for connecting said output signal externally of said transducer; each of said substrate portion, said spacer member, and said connector member defining respective passages communicating with one another and with said internal chamber of said pressure sensor module, said connector member also defining a port communicating with said passages and opening thereon in a respective nipple for communication of said transducer alternatively with ambient pressure or with a second source of pressurized fluid, a filter assembly disposed in one of said passages for excluding particulates and liquid moisture; and a tubular member receiving both said high-pressure fitting member and said connector member in axial juxtaposition, said tubular member at each end thereof including a radially inwardly extending lip part engaging a respective one of said connector member and said high-pressure fitting member to forcefully urge these members toward one another; whereby said high-pressure fitting member and said tubular member cooperatively provide a duality of axial support urging said pressure sensor module into sealing engagement with said sealing feature in opposition to fluid pressures communicating to said high-pressure chamber.

이 특허를 인용한 특허 (43) 인용/피인용 타임라인 분석

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[미국특허] Low cost versatile pressure transducer 원문보기

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