Volumetric test stand cylinder monitor/controller
AssigneeParker-Hannifin Corporation
InventorWilliam Power
Life of this patent
Estimating the term…
Abstract
A test device and a process for determining the accuracy of positive displacement gear pumps includes hydraulic cylinders which are fluidly connected to the output fluid flow(s) from a test pump. Each outlet flow is directed to a separate hydraulic cylinder. The test pump is driven by a motor for a preset number of revolutions. The length of stroke of the piston in each hydraulic cylinder is then determined, which corresponds to the volume of fluid provided from each pump outlet during the revolution of the gears in the pump. It can then be determined if the volumetric accuracy and efficiency of the pump is within acceptable limits.
Claims32
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.
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.
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.
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.
Dependencies are inferred from the claim text.