High pressure transducer

• US 4,559,821 A
• Filed: 04/04/1983
• Issued: 12/24/1985
• Est. Priority Date: 04/06/1982
• Status: Expired due to Fees

• Current Assignee: Kistler Instrumente AG (Kistler Holding AG)
• Original Assignee: Kistler Instrumente AG (Kistler Holding AG)
• Inventors: Engeler, Paul, Wolfer, Peter
• Primary Examiner(s): Levy, Stewart J.
• Assistant Examiner(s): Chapman, Jr., John E.
• Application Number:
  US06/481,881
• Time in Patent Office: 995 Days
• Field of Search: 73/35, 73/167, 73/723, 73/724, 73/725, 73/726, 73/727, 73/728, 73/756, 338/42
• US Class Current: 73/167
• CPC Class Codes: G01L 23/10 by pressure-sensitive members of the piezoelectric type
• CPC Class Codes: G01L 5/14 for measuring the force of explosions; for measuring the energy of projectiles
• CPC Class Codes: G01L 9/008 using piezoelectric devices piezoelectric resonators G01L9/0022; surface acoustic waves G01L9/0025

Abstract

A high pressure transducer, particularly for ballistic pressure measurements, with a sensor part, with a sealing part formed thereon and with a hollow mounting screw surrounding the sensor part with a clearance. The sensor part can be inserted together with the sealing part into a threaded mounting aperture in the component to be examined, whereby the sealing surface of the sealing part comes into sealing contact with a seating surface of the mounting aperture. The hollow mounting screw presses on the sealing part and produces the force necessary for sealing. The sealing surface of the sealing part is located somewhat ahead of a membrane portion while the sealing part is connected relatively elastically with the sensor part by means of a narrow web. The force flux lines produced by the sealing force are restricted in their effect substantially to the sealing part and do not reach the sensor element received in the sensor part; as a result thereof, a substantial independence of the measures values from the mounting conditions is attained.

Claims

1. A high pressure transducer for ballistic application having an externally threaded portion and operable to be threadably secured directly in a mounting aperture having an internally threaded portion and provided in a ballistic structural component, comprising a body member provided with said externally threaded portion, a sensor part connected with the body member and having a membrane portion, a sealing portion and a housing portion, said membrane portion serving to actuate a sensor element located within the housing portion of the sensor part, means adapted to form a shoulder seal between mutually abutting surfaces of the sealing portion and the mounting aperture, said seal being located ahead of the threaded portions, and further means in the transducer operable to substantially keep away from the membrane portion and housing portion, the force flux lines stemming from the tightening and sealing forces which are produced when sealing the transducer relative to the structural component, said further means being formed at least in part by displacement of the housing portion and the membrane portion with respect to the sealing portion so that said force flux lines are substantially kept away from the housing and membrane portions.

2. A transducer according to claim 1, wherein the sensor part is set back with its membrane portion and its housing portion with respect to the sealing portion.

3. A transducer according to claim 1, wherein the sensor part includes a tubular extension forming part of the sealing portion and provided with an external thread for screwing into the mounting aperture, the tubular extension including a sealing surface operable to be brought into sealing engagement with a seating surface provided in the mounting aperture.

4. A high-pressure transducer for ballistic application having an externally threaded portion and operable to be threadably secured directly in a mounting aperture having an internally threaded portion and provided in a ballistic structural component, comprising a main body member, a sensor part connected to the body member and having a membrane portion, a sealing portion and a housing portion, said membrane portion serving to actuate a sensor element located within the housing portion of the sensor part, means adapted to provide a shoulder seal between mutually abutting surfaces of the sealing portion and the mounting aperture, said seal being located ahead of the threaded portions, said sealing portion being flange-like and extending generally radially from the sensor part within the area of the membrane portion, and further means operable to substantially keep away from the housing portion and membrane portion the force flux lines stemming from the tightening and sealing forces which are produced when sealing the transducer relative to the structural component, including a threaded hollow mounting means provided with said externally threaded portion and surrounding the main body member and operable to urge said flange-like sealing portion into sealing engagement with a seating surface in the mounting aperture so that said force flux lines are substantially kept away from the housing and membrane portions.

5. A transducer according to claim 4, wherein the sealing surface of the sealing portion is located ahead of the membrane portion of the sensor part.

6. A transducer according to claim 5, wherein the sealing portion is elastically connected with the housing portion.

7. A transducer according to claim 6, wherein the thickness of a connecting web between the sealing portion and the housing portion is less than about 25% of the diameter of the transducer at the end thereof exposed to the pressure.

8. A transducer according to claim 7, wherein the hollow mounting means surrounds the main body member with clearance at least in the region of the housing portion.

9. A transducer according to claim 8, wherein the sealing portion is connected with the hollow mounting means by a weld.

10. A transducer according to claim 9, wherein the sealing portion has a conical area with a cone-shaped surface for receiving a metal sealing ring which is deformed self-sealingly during installation without deforming the sealing surface of the transducer.

11. A transducer according to claim 10, wherein the hollow mounting means is secured with respect to the main body member by means of a securing ring so that the main body member is removable from the mounting aperture.

12. A transducer according to claim 4, wherein the sealing portion is elastically connected with the housing portion.

13. A transducer according to claim 12, wherein the thickness of a connecting web between the sealing portion and the housing portion is less than about 25% of the diameter of the transducer at the end thereof exposed to the pressure.

14. A transducer according to claim 4, wherein the hollow mounting means surrounds the main body member with clearance at least in the region of the housing portion.

15. A transducer according to claim 14, wherein the sealing portion is connected with the hollow mounting means by a weld.

16. A transducer according to claim 4, wherein the sealing portion has a conical area with a cone-shaped surface for receiving a metal sealing ring which is deformed self-sealingly during installation without deforming the sealing surface of the transducer.

17. A transducer according to claim 4, wherein the hollow mounting means is secured with respect to the main body member by means of a securing ring so that the main body member is removable from the mounting aperture.

18. A transducer according to claim 4, wherein the sealing portion is connected with the hollow mounting means by a weld.

19. A transducer according to claim 18, wherein the hollow mounting means is secured with respect to the main body member by means of a securing ring so that the main body member is removable from the mounting aperture.