Pipe pressure sensor

• US 4,840,068 A
• Filed: 03/14/1988
• Issued: 06/20/1989
• Est. Priority Date: 03/14/1988
• Status: Expired due to Fees

• Current Assignee: John D. Mayhew Jr
• Original Assignee: John D. Mayhew Jr
• Inventors: Mayhew, John D. Jr.
• Primary Examiner(s): Woodiel, Donald O.
• Application Number:
  US07/168,077
• Time in Patent Office: 463 Days
• Field of Search: 73/730, 73/706, 73/861.47, 73/861.48, 73/119 A, 73/715, 92/5
• US Class Current: 73/730
• CPC Class Codes: G01L 19/0023 for flowthrough systems having a flexible pressure transmitting element
• CPC Class Codes: G01L 19/0046 using isolation membranes G01L13/026 and G01L19/0645 take precedence

Abstract

A pipe pressure sensor (10) comprises a chamber holder (14) for defining a hollow chamber (28) which is urged toward a pipe (20) to clamp a diaphragm (16) between the pipe and a portion of the chamber holder surrounding a pressure-inlet opening (30) into the chamber. The diaphragm has a round, sensing, protrusion (42) with a sensing tip (46) on an outer end thereof for extending outwardly from one side of the diaphragm to extend through a round hole (44) in the pipe so as to communicate pressure in the pipe to the chamber.

Claims

1. A pressure sensor to be mounted on a pipe having a hole therein for measuring the pressure of fluid in the pipe comprising:

a chamber holder for defining a hollow chamber having a pressure inlet opening and a pressure outlet opening;

a pressure gauge attached to said chamber holder and communicating with said hollow chamber through said pressure outlet for measuring the pressure of a fluid in said hollow chamber;

a fluid in said chamber;

a mounting means for engaging a pipe and said chamber holder and mounting said chamber holder on said pipe by urging the pressure-inlet opening of said chamber holder toward said pipe;

a diaphragm comprising a wide flat flange means and a narrower, round, sensing protrusion with a sensing tip on the outer end thereof extending outwardly from one side of the diaphragm, said flange means having the function of being positioned between said chamber holder and an outer surface of said pipe to form a sealed interface between a portion of said chamber holder surrounding said pressure-inlet opening and said pipe, said protrusion extending through said hole in said pipe so as to communicate pressure of fluid in the pipe to the fluid in the chamber via the diaphragm, said sensing protrusion having a length such that when the pressure sensor is mounted on said pipe the sensing tip of said sensing protrusion is positioned approximately at an inner surface of said pipe and a diameter which is approximately the same as the diameter of said hole;

whereby a hole can be bored in said pipe having a diameter of approximately the diameter of said round sensing protrusion, said pressure sensor can be mounted at said hole with said sensing protrusion extending therethrough so that pressure of fluid in said pipe is transmitted to said pressure gauge via said sensing protrusion.

2. A pressure sensor as in claim 1, wherein said mounting means is a strap for extending about said pipe and engaging said chamber holder and wherein said flange means has the function of contacting the outer surface of said pipe for forming said sealed compression interface between said portion of said chamber holder and said surface of said pipe.

3. A pressure sensor as in claim 1, wherein said mounting means includes a piece welded to said pipe and said diaphragm flange has the function of contacting said piece welded to said pipe to form said sealed compression interface.

4. A method of sensing the pressure in a pipe comprising the steps of:

boring a hole in said pipe to have a particular diameter;

positioning a diaphragm on the outside of said pipe at said bored hole, said diaphragm comprising a wide flat flange means and a narrow, round, sensing protrusion with a sensing tip on the outer end thereof extending outwardly from one side of the diaphragm, said round sensing protrusion having a diameter which approximately the same as the particular diameter of the hole bored in the pipe, said step of mounting said diaphragm on said pipe at said hole, including the substep of inserting said sensing protrusion through said hole;

mounting a chamber holder defining a hallow chamber on said pipe at said hole, above said diaphragm, said chamber holder defining a hallow chamber having a pressure inlet opening and a pressure outlet opening, a portion of said chamber holder surrounding said pressure inlet opening contracting said flat flange means to surround said sensing protrusion;

applying a force to said chamber holder to urge said chamber holder towards said pipe, and thereby form a sealed interface between said pipe and said chamber holder at said flat flange means;

measuring the pressure of a fluid in said chamber of said chamber holder which is communicated to said chamber via said diaphragm protrusion.