System for monitoring diaphragm pump failure

• US 5,883,299 A
• Filed: 06/05/1997
• Issued: 03/16/1999
• Est. Priority Date: 06/28/1996
• Status: Expired due to Fees

• Current Assignee: Texaco Incorporated (Chevron Corp.)
• Original Assignee: Texaco Incorporated (Chevron Corp.)
• Inventors: Green, Steven R., Powell, David L. Jr.
• Primary Examiner(s): Williams, Hezron
• Assistant Examiner(s): WIGGINS, JOHN DAVID
• Application Number:
  US08/869,644
• Time in Patent Office: 649 Days
• Field of Search: 73/40, 73/40.5 R, 340/605, 356/441, 417/395, 417/21, 417/63
• US Class Current: 73/40
• CPC Class Codes: F04B 2201/0208 Leakage across the piston
• CPC Class Codes: F04B 2205/50 Presence of foreign matter in the fluid
• CPC Class Codes: F04B 43/009 leakage control; pump systems with two flexible members; between the actuating element and the pumped fluid

Abstract

A diaphragm failure monitoring system for detecting leakage in a diaphragm of a diaphragm pump. The system includes a pump having an operating chamber containing a working fluid and a pumping chamber for pumping material into and out of the pump and a diaphragm separating the operating and pumping chambers. A first optic fiber is joined to the operating chamber for transmitting an optic signal across the working fluid. A second optic fiber is joined to the operating chamber for receiving the optic signal from the first optic fiber. An electric signal establishing device establishes a first electrical signal when the optic signal from the first optic fiber to the second optic fiber passes through uncontaminated working fluid. The electric signal establishing device establishes a second electrical signal when the optic signal from the first optic fiber to the second optic fiber passes through contaminated working fluid, whereby leakage of a contaminating material through the diaphragm into the operating chamber can be detected when the second electrical signal is established.

Claims

1. A diaphragm failure monitoring system and apparatus, for detecting leakage in a diaphragm of a diaphragm pump, comprising:

a) a pump having an operating chamber containing a working fluid and a pumping chamber for pumping material into and out of the pump and a diaphragm separating the operating chamber and the pumping chamber;

b) a first optic fiber joined to said operating chamber for transmitting an optic signal across said working fluid;

c) a second optic fiber joined to said operating chamber, in spaced arrangement from said first optic fiber, and without being connected to said first optic fiber at said operating chamber, for receiving said optic signal from said first optic fiber;

d) means for establishing a first electrical signal, corresponding to a minimum optic signal level of light attenuation, when the optic signal from said first optic fiber to said second optic fiber passes through the working fluid in an uncontaminated state; and

e) means for establishing a second electrical signal different from the first electrical signal, and corresponding to a higher optic signal level of light attenuation than the minimum optic signal level of light attenuation, when the optic signal from said first optic fiber to said second optic fiber passes through working fluid in a contaminated state, whereby leakage of a contaminating material, that is part of the material being pumped, into said working fluid through said diaphragm into said operating chamber can be detected when said second electrical signal is established.

2. The apparatus of claim 1, wherein said diaphragm comprises rubber.

3. The apparatus of claim 1, wherein said working fluid comprises oil.

4. The apparatus of claim 1, additionally comprising a hollow, optical cell secured to said operating chamber for receiving a portion of the working fluid, wherein said cell includes first means for connecting with said first optic fiber and second means for connecting with said second optic fiber.

5. The apparatus of claim 4, wherein said first and second connecting means are located at opposite sides of said optical cell.

6. The apparatus of claim 5, wherein said first optic fiber includes an emitter end connected to said first connecting means and said second optic fiber includes a collector end connected to said second connecting means, and wherein said means for establishing said first electrical signal and said means for establishing said second electrical signal comprise an optical amplifier connected to the other ends of said first and second optic fibers.

7. The apparatus of claim 6, wherein said optic signal comprises a high intensity, green light.

8. The apparatus of claim 7, additionally comprising an isolation signal conditioner connected to said optical amplifier, and a distributive control system connected to said isolation signal conditioner, wherein said electrical signals are fed from said amplifier to said distributive control system through said isolation signal conditioner.

9. The apparatus of claim 8, additionally comprising a power supply communicating with said optical amplifier and said isolation signal conditioner.

10. The apparatus of claim 9, wherein said first and second connecting means each comprises a plug.

11. A method of detecting leakage in a diaphragm of a diaphragm pump, said pump having an operating chamber containing a working fluid and a pumping chamber for pumping material into and out of the pump and a diaphragm separating the operating chamber and the pumping chamber, comprising:

a) transmitting an optic signal through said working fluid from one optic fiber to a second optic fiber that receives the transmitted optic signal;

b) maintaining the first and second optic fibers spaced and unconnected to each other at the working fluid;

c) establishing a first electrical signal corresponding to a minimum optic signal level of light attenuation when the received optic signal passes through the working fluid in an uncontaminated state; and

d) establishing a second electrical signal corresponding to a higher signal level of light attenuation than the minimum optic signal level of light attenuation when the received optic signal passes through the working fluid in a contaminated state, whereby leakage of a contaminating material, that is part of the material being pumped through said diaphragm into said operating chamber can be detected when said second electrical signal is established.

12. The method of claim 11, wherein a hollow, optical cell is connected to said first and second optic fibers for receiving a portion of said working fluid, and said optic signal is transmitted across said optical cell.

13. The method of claim 12, wherein said first and second electrical signals are established by an optical amplifier connected to said first and second optic fibers.

14. The method of claim 13, wherein said optic signal comprises a high intensity, green light.

15. The method of claim 14, wherein said working fluid comprises oil.