Measuring and testing – Fluid pressure gauge – Diaphragm
Patent
1995-11-28
1997-01-21
Chilcot, Richard
Measuring and testing
Fluid pressure gauge
Diaphragm
73721, 73717, G01L 904, G01L 708
Patent
active
055961487
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a pressure difference measurement transducers in general and more particularly to an improved transducer of this type which permits easier assembly.
A pressure difference transducer of the type with an inner housing divided into two parts transversely to its longitudinal axis, between the two housing sections of which is clamped a central diaphragm bearing a pressure sensor and whose one housing section contains an electric lead-through in a bore, an external extension of which lies in an enlarged part of the bore is known in the art.
For example, in the pressure difference measurement transducer disclosed in U.S. Pat. No. 4,135,408, the bore containing the electric lead-through runs transversely to the longitudinal axis of the measurement transducer from the outside to the inside. The bore is enlarged towards the outside so that the an external extension of the electric lead-through can be pressed against an internal shoulder. Between the external extension and the shoulder, an O-ring is laid in order to make a reliable seal to the outside. Since, in this known pressure difference measurement transducer, the full static pressure in the inside of the measurement transducer acts upon the electric lead-through, a solid screw is screwed within the bore against the external extension of the electric lead-through.
Another measuring device for pressure measurement, this one with an electric lead-through housed in a bore parallel to the longitudinal axis of the measurement transducer is described DE 34 37 668 A1. An external extension of the lead-through lies in an enlarged part of the bore toward the pressure loading, which in turn, on its side away from the pressure loading, becomes an outwardly directed transverse bore. No sensor is arranged on the central diaphragm in this measuring device. Instead, a pressure and a pressure difference sensor are fastened parallel to the longitudinal axis of the measurement transducer side-by-side in an inner housing section such that their electrical terminals lie side-by-side in a plane. The electrical terminals of the sensors are connected, in each case, by means of a conductor strip, to an electric lead-through also lying axially parallel next to the sensors.
DE 35 00 613 A1 discloses connecting the bonding wires of a piezoresistive pressure measurement cell directly to the supply lines on a plastic foil material section. However, in this reference, the teaching is not directed to connecting an off the shelf pressure sensor provided with a bonding plate and a housing to an electric lead-through in a simple manner.
Thus, a need still exists to provide a pressure difference measurement transducer which can be manufactured in a relatively simple manner in terms of the arrangement of the electric lead-through.
SUMMARY OF THE INVENTION
This need is satisfied in a pressure difference measurement transducer of the general type described above in which the bore runs parallel to the longitudinal axis and has at its end towards the other housing section an enlarged section. At its end away from the other housing section, the bore becomes an outwardly directed transverse bore. A ribbon-like conductor foil which is led through an angular bend next to the pressure sensor close to the central diaphragm and forms a loop in the area of the electric lead-through runs between the pressure sensor and the electric lead-through.
One advantage of the pressure difference measurement transducer according to the present invention resides in the fact that, despite the mounting of the pressure sensor on the central diaphragm, through the arrangement of the bore and its form, the electric lead-through with its external extension is pressed by the static internal pressure against an extension formed by the enlarged part of the bore, as a result of which the pressure loading of the electric lead-through due to the static internal pressure is supported by the one homing section. A solid screwing to support the static pressure exerted on t
REFERENCES:
patent: 3691842 (1972-09-01), Akeley
patent: 3780588 (1973-12-01), Whitehead, Jr. et al.
patent: 4135408 (1979-01-01), DiGiovanni
patent: 4766769 (1988-08-01), Nudd, Jr. et al.
patent: 4798089 (1989-01-01), Frick et al.
TM TECHNISCHES MESSEN, vol. 56, No. 11, Nov. 1989, Munchen, DE, pp. 415-417, O. Ehrmann et al.: Tape Automated Bonding for Sensors.
G. Ehrler, Siemens AG, Munchen, DE: Piezoresistive Silizium-Elementardrucksensoren, AMA-Seminar Mikrotechnik, Heidelberg, Mar. 14-15, 1989, pp. 81-95.
Chilcot Richard
Felber Joseph L.
Siemens Aktiengesellschaft
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