Means for ascertaining the internal pressure in a pressure pipe system

• US 4,425,800 A
• Filed: 06/09/1981
• Issued: 01/17/1984
• Est. Priority Date: 05/07/1976
• Status: Expired due to Fees

• Current Assignee: Hans List
• Original Assignee: Hans List
• Inventors: Zeiringer, Rudolf, Claassen, Peter
• Primary Examiner(s): Woodiel, Donald O.
• Application Number:
  US06/272,007
• Time in Patent Office: 952 Days
• Field of Search: 73/730, 73/119 A, 73/35, 73/167
• US Class Current: 73/730
• CPC Class Codes: F02M 65/003 Measuring variation of fuel pressure in high pressure line
• CPC Class Codes: G01L 9/0001 Transmitting or indicating the displacement of elastically deformable gauges by electric, electro-mechanical, magnetic or electro-magnetic means G01L9/0026, G01L9/0033, G01L9/0082, G01L9/0089, G01L9/0091 take precedence

Abstract

A device for ascertaining the internal pressure in a pressure system, particularly in a fuel injection pipe system, wherein the pressure to be measured is contained within an element which includes at one point a wall portion of reduced thickness so as to act like a membrane, and wherein a sensor device is included which is positionable in engagement with the membrane-like wall portion to detect any elastic deformation and variation of the membrane caused by the influence of the internal pressure.

Claims

1. A means for ascertaining the internal pressure in an injection pump system which comprises

a solid, one piece connector nipple which is interconnectable with the injection pump system, said connector nipple including a generally cylindrically-shaped portion which defines an outer surface and includes an axial passageway extending therethrough, said generally cylindrically-shaped portion also including at least one blind bore extending inwardly from said outer surface toward said axial passageway, the bottom of each said blind bore being smooth and defining a wall portion of said connector nipple which is sufficiently thin that it is elastically deformable when subjected to the pressure of a pressure fluid in said axial passageway,

a holding device, and

a load sensor cell mounted on said holding device, said load sensor cell being shaped to fit within each said blind bore such that, when solely and temporarily pressed into direct contact with the smooth bottom of a particular blind bore by means of said holding device, it will measure the elastic deformity in the associated wall portion of said connector nipple and thus provide information as to the internal pressure in said axial passageway and consequently in the injection pump system.

2. A means according to claim 1, wherein said axial passageway has a circular cross section.

3. A means for ascertaining the internal pressure in a pressure system which comprises

a solid, one piece element which is interconnectable with the pressure system, said element including a generally cylindrically-shaped portion which defines an outer surface and includes an axial passageway extending therethrough, said generally cylindrically-shaped portion also including at least one blind bore extending inwardly from its outer surface toward said axial passage, the bottom of each said blind bore being smooth and defining a wall portion of said element which is sufficiently thin that it is elastically deformable when subjected to the pressure of a pressure fluid in said axial passageway, said generally cylindrically-shaped portion also including a conical recess extending inwardly from its outer surface radially opposite each said bore therein,

a holding device in the form of a clamp strap which has two opposite ends, a first of said two opposite ends being engagable in each said conical recess in the cylindrically-shaped portion of said element, and

a load sensor cell mounted on a second of said two opposite ends of said clamp strap said load sensor cell being shaped to fit within each said blind bore such that, when solely and temporarily pressed into direct contact with the smooth bottom of a particular blind bore by means of said holding device, it will measure the elastic deformity in the associated wall portion of said element and thus provide information as to the internal pressure in said axial passageway and consequently in the pressure system.

4. A means for ascertaining the internal pressure in a pressure system which comprises

a solid, one piece element which is interconnectable with the pressure system, said element including a generally cylindrically-shaped portion which defines an outer surface and includes an axial passageway extending therethrough, said generally cylindrically-shaped portion also including at least one blind bore extending inwardly from its outer surface toward said axial passage, the bottom of each said blind bore being smooth and defining a wall portion of said element which is sufficiently thin that it is elastically deformable when subjected to the pressure of a pressure fluid in said axial passageway, said generally cylindrically-shaped portion also including a blind cylindrical recess extending radially inwardly from its outer surface directly opposite each blind bore therein and extending to the surface of said wall portion of the associated blind bore and a cylindrical plug which extends in each said blind cylindrical recess from the outer surface of said generally cylindrically-shaped portion to said axial passageway, each said cylindrical plug including an indentation in its end surface at said outer surface of said generally cylindrically-shaped portion of said element,

a clamp strap which has two opposite ends, a first of said two opposite ends being engagable in said indentation in each said cylindrical plug, and

a load sensor cell mounted on a second of said two opposite ends of said clamp strap, said load sensor cell being shaped to fit within each said blind bore such that, when solely and temporarily pressed into direct contact with the smooth bottom of a particular blind bore by means of said holding device, it will measure the elastic deformity in the associated wall portion of said element and thus provide information as to the internal pressure in said axial passageway and consequently in the pressure system.

5. A means for ascertaining the internal pressure in a pressure system which comprises

a solid, one piece element which is interconnectable with the pressure system, said element including a generally cylindrically-shaped portion which defines an outer surface and includes an axial passageway extending therethrough, said generally cylindrically-shaped portion including at least one blind cylindrical bore extending radially inwardly from said outer surface toward said axial passageway, the bottom of each said blind cylindrical bore being initially flat and defining a wall portion of said element which is sufficiently thin that it is elastically deformable when subjected to the pressure of a pressure fluid in said axial passageway, the sides of each said blind cylindrical bore being threaded,

a holding device in the form of a hollow, cylindrically-shaped frame which is threaded along its outer side so as to be threadingly engagable with the threaded sides of each said blind cylindrical bore, and

a cylindrically-shaped load sensor cell mounted within said cylindrically-shaped frame of said holding device, said cylindrically-shaped load sensor cell having a flat head and being dimensioned to fit within each said blind cylindrical bore such that, when said flat head thereof is solely and temporarily pressed into direct contact with the bottom of a blind cylindrical bore by means of said holding device, it will measure the elastic deformity in the associated wall portion of said element and thus provide information as to the internal pressure in said axial passageway and consequently in the pressure system.

6. A means for ascertaining the internal pressure in a pressure system which comprises

a solid, one piece element which is interconnectable with the pressure system, said element including a generally cylindrically-shaped portion which defines an outer surface and includes an axial passageway extending therethrough, said generally cylindrically-shaped portion including at least one blind cylindrical bore extending radially inwardly from said outer surface toward said axial passageway, the bottom of each said blind cylindrical bore being initially flat and defining a wall portion of said element which is sufficiently thin that it is elastically deformable when subjected to the pressure of a pressure fluid in said axial passageway,

a holding device in the form of a clamping strap which is capable of fitting around said generally cylindrically-shaped portion where each said blind cylindrical bore is located, said clamping strap including two opposite ends having respective holes therethrough, said clamping strap including an attachment means extending through a first of said respective holes so as to extend inwardly of said clamping strap and be adjustable with respect thereto,

a cylindrically-shaped load sensor cell extending through the second of said respective holes in said clamping strap so as to extend inwardly of said clamping strap, said cylindrically-shaped load sensor cell having a flat head and being dimensioned to fit within each said blind cylindrical bore such that, when said flat head thereof is solely and temporarily pressed into direct contact with the bottom of a blind cylindrical bore by means of said holding device, it will measure the elastic deformity in the associated wall portion of said element and thus provide information as to the internal pressure in said axial passageway and consequently in the pressure system.