Claims
- 1. A test device for testing the accuracy and efficiency of a positive displacement test pump, the test device comprising:a hydraulic cylinder having a moveable piston, an inlet to one end of the cylinder connectable to an outlet of the test pump, and an outlet at the other end of the cylinder; means for rotating a drive shaft of the test pump to provide fluid to the inlet of the hydraulic cylinder and for monitoring the rotation of the drive shaft of the test pump; means for sensing the movement of the piston in the cylinder as the cylinder receives fluid from the test pump; and means for calculating the volume of the fluid provided to the hydraulic cylinder based on the movement of the cylinder piston and the rotation of the drive shaft of the test pump, and for calculating whether the output of the test pump is within allowable limits.
- 2. The test device as in claim 1, further including display means for displaying the results of the calculations of whether the output of the test pump is within the allowable limits.
- 3. The test device as in claim 1, further including multiple hydraulic cylinders, each cylinder having a moveable piston, an inlet to one end of the cylinder connectable to an outlet of the test pump, and an outlet at the other end of the cylinder.
- 4. The test device as in claim 1, and further including a moveable cart supporting the test device and having a support surface for locating a pump to be tested.
- 5. The test device as in claim 4, and further including an inlet supply pump mounted on the cart and connectable to an inlet of the test pump to provide fluid under pressure to the test pump.
- 6. The test device as in claim 5, and further including a tank supported on the cart for holding a fluid to be supplied by the inlet supply pump to the test pump.
- 7. The test device as in claim 6, and further including a return line fluidly connecting the outlet of the hydraulic cylinder and the tank.
- 8. The test device as in claim 7, and further including a directional control valve controlling the flow of fluid between the inlet supply pump, the tank, the outlet of the hydraulic cylinder and inlet of the test pump.
- 9. The test device as in claim 6, and further including a return line connectable to the outlet of the test pump and to the tank.
- 10. The test device as in claim 9, and further including a directional control valve controlling the flow of fluid between the outlet of the test pump, the tank, and the inlet to the hydraulic cylinder.
- 11. The test device as in claim 1, and further including a pressure regulating valve to adjust the pressure of the fluid applied to the inlet of the test pump.
- 12. The test device as in claim 11, and further including a pressure regulating valve to adjust the pressure of the fluid provided at the outlet of the test pump.
- 13. The test device as in claim 1, wherein the piston is movable axially within the hydraulic cylinder.
- 14. A test device for testing the accuracy and efficiency of a positive displacement test pump, the test device comprising:a hydraulic cylinder having a moveable piston, an inlet to one end of the piston connectable to an outlet of the test pump, and an outlet at the other end of the piston; a motor connectable through a drive shaft to the pump to drive the test pump to provide fluid from the outlet of the test pump along an inlet line to the inlet of a hydraulic cylinder, and a pick-up to monitor the movement of the drive shaft of the test pump; a sensor to sense the movement of the piston in the cylinder when the cylinder receives fluid from the test pump; and electronic processing circuitry connected to the pick-up and the sensor to calculate the volumetric efficiency of the test pump based on the movement of the piston and the movement of the drive shaft of the test pump.
- 15. The test device as in claim 14, further including display means for displaying the results of the calculations.
- 16. The test device as in claim 14, further including multiple hydraulic cylinders, each cylinder having a moveable piston, an inlet to one end of the cylinder connectable to an outlet of the test pump, and an outlet at the other end of the cylinder.
- 17. The test device as in claim 14, and further including a moveable cart supporting the test device and having a support surface for locating a pump to be tested.
- 18. The test device as in claim 17, and further including an inlet supply pump mounted on the cart and connectable to the test pump to provide fluid under pressure from the tank to the test pump.
- 19. The test device as in claim 18, and further including a tank supported on the cart for holding a fluid to be supplied by the inlet supply pump to the test pump.
- 20. The test device as in claim 19, and further including a return line fluidly connecting the outlet of the hydraulic cylinder and the tank.
- 21. The test device as in claim 20, and further including a directional control valve controlling the flow of fluid between the inlet supply pump, the tank, the outlet of the hydraulic cylinder and inlet of the test pump.
- 22. The test device as in claim 19, and further including a return line connectable to the outlet of the test pump and to the tank.
- 23. The test device as in claim 22, and further including a directional control valve controlling the flow of fluid between the outlet of the test pump, the tank, and the inlet to the hydraulic cylinder.
- 24. The test device as in claim 14, and further including a pressure regulating valve to adjust the pressure of the fluid applied to the inlet of the test pump.
- 25. The test device as in claim 24, and further including a pressure regulating valve to adjust the pressure of the fluid provided at the outlet of the test pump.
- 26. The test device as in claim 14, wherein the piston is movable axially within the hydraulic cylinder.
- 27. A test device for testing the accuracy and efficiency of a positive displacement gear pump, the gear pump having a single inlet and multiple outlets, the device comprising:a moveable cart supporting the test device and having a support surface for locating the gear pump; a series of hydraulic cylinders, each hydraulic cylinder having a moveable piston, an inlet to one end of the piston of each cylinder connectable to a respective outlet of the gear pump, and an outlet at the other end of the piston; a motor connectable through a drive shaft to the gear pump to drive the test gear pump to provide fluid from each outlet of the gear pump along an inlet line to the inlet of a hydraulic cylinder, and a pick-up to monitor the driving of the gear pump; sensor to sense the movement of the piston in the cylinder when the cylinder receives fluid from the gear pump; electronic processing circuitry connected to the pick-up and to the sensor to calculate the volumetric efficiency of the gear pump based on the movement of the piston and the movement of the drive shaft of the gear pump; and a display to display the efficiency of the gear pump.
- 28. The test device as in claim 27, wherein the piston in each hydraulic cylinder is movable axially within the respective hydraulic cylinder.
- 29. A method for determining the efficiency of a positive displacement test pump having a drive shaft, comprising the steps of:providing an inlet flow into the test pump; rotating the drive shaft of the test pump and monitoring the rotation of a drive shaft; directing an outlet flow from the test pump to a hydraulic cylinder, the hydraulic cylinder having a piston and the outlet flow from the test pump moving the piston; sensing the movement of the piston in the hydraulic cylinder; and calculating the volumetric efficiency of the test pump based on the movement of the piston and the rotation of the drive shaft.
- 30. The method as in claim 29, further including the step of comparing the flow through the test pump with stored values of an acceptable range, and providing an indication of whether the flow is within the range.
- 31. The method as in claim 29, wherein the rotation of the drive shaft is monitored for a preset number of revolutions.
- 32. The method of claim 29, wherein the outlet flow from the test pump moves the piston axially within the hydraulic cylinder.
RELATED CASES
The present application claims priority to U.S. Provisional Application Ser. No. 60/084,126, filed May 4, 1998.
US Referenced Citations (6)
Provisional Applications (1)
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Number |
Date |
Country |
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60/084126 |
May 1998 |
US |