Pressure sensor

• US 4,738,141 A
• Filed: 12/17/1986
• Issued: 04/19/1988
• Est. Priority Date: 04/02/1986
• Status: Expired due to Fees

• Current Assignee: Robert Bosch GmbH
• Original Assignee: Robert Bosch GmbH
• Inventors: Kas, Gunter
• Primary Examiner(s): Woodiel, Donald O.
• Application Number:
  US06/942,652
• Time in Patent Office: 489 Days
• Field of Search: 73/735, 73/739, 73/741, 73/743, 73/742, 73/708, 338/32 H
• US Class Current: 73/735
• CPC Class Codes: G01L 9/0026 Transmitting or indicating the displacement of flexible, deformable tubes by electric, electromechanical, magnetic or electromagnetic means G01L9/0008 takes precedence
• CPC Class Codes: G01L 9/14 involving the displacement of magnets, e.g. electromagnets

Abstract

An improved pressure sensor includes a Bourdon tube, as its sensing element, and an indicator controlled thereby. At least one tightly closed container is secured to a free end of the Bourdon tube and is partly filled with a bulk material. If the Bourdon tube is made to vibrate as a result of pressure shocks or vibration forces acting upon its fixed end frictional forces that consume vibration energy arise between the container and the amounts of bulk material contained. The indicator includes Hall elements and permanent magnets, which magnets are secured on the Bourdon tube and are moved by it relative to the Hall elements.

Claims

1. A pressure sensor comprising a Bourdon tube, one end of said Bourdon tube being fixed, said Bourdon tube further including a free end associated with a contactless indicator, said contactless indicator including a tightly closed container and said container being at least partially filled with a damping agent comprising a bulk material.

2. A pressure sensor as defined by claim 1 in which at least one additional container having bulk material is associated with said movable free end of said Bourdon tube.

3. A pressure sensor as defined by claim 2, in which said containers are of different lengths in their directions of movement.

4. A pressure sensor as defined by claim 3, in which said containers are filled with different amounts of said bulk material.

5. A pressure sensor as defined by claim 4, in which said indicator further comprises at least one Hall element disposed in a fixed manner and at least one permanent magnet joined to said movable free end of said Bourdon tube.

6. A pressure sensor as defined by claim 3, in which said containers are filled with different types of bulk material.

7. A pressure sensor as defined by claim 3, in which said indicator further comprises at least one Hall element disposed in a fixed manner and at least one permanent magnet joined to said movable free end of said Bourdon tube.

8. A pressure sensor as defined by claim 2, in which said containers are filled with different amounts of said bulk material.

9. A pressure sensor as defined by claim 8, in which said containers are filled with different types of bulk material.

10. A pressure sensor as defined by claim 8, in which said indicator further comprises at least one Hall element disposed in a fixed manner and at least one permanent magnet joined to said movable free end of said Bourdon tube.

11. A pressure sensor as defined by claim 2, in which said containers are filled with different types of bulk material.

12. A pressure sensor as defined by claim 2, in which said indicator further comprises at least one Hall element disposed in a fixed manner and at least one permanent magnet joined to said movable free end of said Bourdon tube.

13. A pressure sensor as defined by claim 1, in which said indicator further comprises at least one Hall element disposed in a fixed manner and at least one permanent magnet joined to said movable free end of said Bourdon tube.

14. A pressure sensor as defined by claim 13, in which said at least one permanent magnet is disposed such that it is adjustable relative to the Hall element by a threaded means.

15. A pressure sensor as defined by claim 14, in which said permanent magnet is secured by means of a self-locking threaded means.