Measuring and testing – Fluid pressure gauge – Diaphragm
Patent
1988-09-14
1990-01-02
Woodiel, Donald O.
Measuring and testing
Fluid pressure gauge
Diaphragm
73754, 338 4, G01L 708, G01L 906
Patent
active
048904988
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
This invention relates to pressure sensors and more particularly to an improved pressure sensor which is easy to assemble and has improved strength. In a known pressure sensor, the pressure-sensitive element is inserted in a pocket bore hole and pressed against the base of the pocket bore hole by a holding part. For this purpose, a relatively large bore hole diameter is necessary so as to be able to insert the pressure-sensitive element. The strength of the pressure sensor is accordingly decreased. In particular, the strength of the wall of the pressure sensor may not be sufficient when this sensor is used for a longer period or at extremely high pressures.
SUMMARY OF THE INVENTION
The invention is directed to a pressure sensor for detecting the pressure of a medium comprising, in combination: a pressure-sensitive element having electrical properties which change under the influence of pressure, a housing for supporting the pressure-sensitive element, the housing having a hollow space in the form of a continuous bore hole, a closing member for sealing the continuous bore hole relative to the medium whose pressure is to be determined, the closing member having an inner side which contacts the pressure sensitive element in such a way that mechanical stress is produced at the pressure-sensitive element, and electrical conductors extending through the hollow space for carrying electrical signals from the pressure sensitive element.
A pressure sensor according to the invention has the advantage in that the housing has a smaller bore hole diameter; it need only correspond to the thickness of the electrical conductors. The pressure-sensitive element is slid into a recess of the housing from the side of the pressure medium, so that a larger bore hole diameter is needed only in the area of the pressure-sensitive element. Since the bore hole is closed by means of a closing member, against which the pressure-sensitive element rests, good pressure transmission from the pressure medium to the pressure-sensitive element is ensured. At the same time, the pressure-sensitive element is separated from the pressure medium, as in an arrangement in a pocket bore hole. The strength of the pressure sensor is considerably improved.
Advantageous developments of the pressure sensor of the invention are possible which simplify its assembly. In particular, strip conductors can be printed on a carrier in a simple manner, and the respective measurement signals are derived in this way from the pressure-sensitive element.
BRIEF DESCRIPTION OF THE DRAWING
The invention will now be described in greater detail with particular reference to the accompanying drawing wherein:
FIG. 1 is an elevational sectional view of a pressure sensor according to the invention;
FIG. 2 is a similar view of a modification of the pressure sensor shown in FIG. 1; and
FIG. 3 is a sectional view taken along the line III--III in FIG. 2.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
In FIG. 1, the housing of a pressure sensor 11, which is constructed as a screw or in the shape of a screw, is designated by the reference numeral 10. The housing 10 is inserted in a bore hole 12 of the wall 13 of a pressure vessel and can project over the wall 13 into the pressure medium, whose pressure or variation in pressure, respectively, is to be measured. The housing 10 comprises an approximately central, continuous, stepped longitudinal bore hole 14 comprising portions 15 and 16. The portion 16 with the greatest diameter faces the interior of the pressure vessel, i.e. the pressure medium.
An insulating member 20 (e.g. glass), which is enclosed by a metal ring 21, is located in the portion 16 of the longitudinal bore hole 14. The metal ring 21 rests at the shoulder 22 formed between the portions 15, 16 of the longitudinal bore hole 14 and is at a distance radially from the wall of the portion 16. A pressure-sensitive element 23, which is adjoined by a disk 24, is arranged on the front side of the insulating member 20 facing the pressure medium. The
REFERENCES:
patent: 3031591 (1962-04-01), Cary et al.
patent: 3082334 (1963-03-01), Riesen
patent: 4519254 (1985-05-01), Sondergger et al.
Dobler Klaus
Wendel Jurgen
Robert & Bosch GmbH
Striker Michael J.
Woodiel Donald O.
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