Method and means for testing hydraulic pump

• US 3,942,375 A
• Filed: 10/11/1974
• Issued: 03/09/1976
• Est. Priority Date: 10/11/1974
• Status: Expired due to Term

• Current Assignee: J. D. Shepherd
• Original Assignee: J. D. Shepherd
• Inventors: Shepherd, J. D.
• Primary Examiner(s): Queisser, Richard C.
• Assistant Examiner(s): Rasco, Marcus S.
• Application Number:
  US05/514,138
• Time in Patent Office: 515 Days
• Field of Search: 73/168, 73/134, 73/133
• US Class Current: 73/168
• CPC Class Codes: F04B 2201/1202 Torque on the axis
• CPC Class Codes: F04B 2201/1203 Power on the axis
• CPC Class Codes: F04B 2205/05 Pressure after the pump outlet
• CPC Class Codes: F04B 2205/09 Flow through the pump
• CPC Class Codes: F04B 2205/11 Outlet temperature
• CPC Class Codes: F04B 51/00 Testing machines, pumps, or pumping installations
• CPC Class Codes: F04D 15/0088 Testing machines
• CPC Class Codes: G01M 13/00 Testing of machine parts

Abstract

The testing method and means of the present invention utilizes a conventional dynamometer for testing a hydraulic pump. The dynamometer is used to mechanically drive the pump and the hydraulic system of the dynamometer is used to supply the test pump with hydraulic fluid. A flow rater is connected to the tested pump for registering the pressure, flow rate, and temperature of the fluid being pumped by the test pump.

Claims

1. A device for testing a hydraulic pump having a charging inlet, a discharge outlet, and a rotor shaft, said device comprising:

a dynamometer comprising a drive shaft, a dynamometer pump, and means connecting said drive shaft to said dynamometer pump for driving said dynamometer pump, said dynamometer pump being hydraulically connected in a hydraulic circuit for pumping hydraulic fluid through said circuit in response to rotation of said drive shaft;

a tachometer connected to said drive shaft for measuring the rotational speed thereof;

a first conduit connected to said hydraulic circuit of said dynamometer, said first conduit having first coupling means thereon for coupling said conduit to said charging inlet of said test pump;

a second conduit connected to said dynamometer hydraulic circuit for returning fluid to said dynamometer circuit, said second conduit having a second coupling means for connecting said second conduit to said discharge end of said test pump;

a flow rater connected to said second conduit and having gauges for registering the rate of flow of fluid in said second conduit; and

mechanism connected to said drive shaft of said dynamometer and having means adapted to be connected to said rotor shaft of said test pump for driving said test pump in response to rotation of said drive shaft of said dynamometer.

2. A device according to claim 1 wherein valve means are in said first conduit for regulating the rate of fluid flow from said dynamometer pump to said test pump.

3. A device according to claim 2 wherein said valve means comprise a pressure relief valve having an overflow outlet adapted to discharge fluid which is introduced to said pressure relief valve at a rate greater than a preselected rate, means connecting said overflow outlet to said dynamometer hydraulic circuit.

4. A device according to claim 3 wherein said pressure relief valve includes adjustment means for selectively varying said preselected rate of flow.

5. A device according to claim 4 wherein gauge means are connected to said first conduit between said pressure relief valve and said test pump for registering the pressure of fluid being introduced to said test pump.

8. A device according to claim 5 wherein said mechanism comprises a gear box within said dynamometer drivingly connected to said drive shaft and having a second drive shaft, a first sprocket on said second drive shaft, a pump shaft rotatably mounted to said dynamometer and having a second sprocket thereon, a drive chain trained around said sprockets for transferring rotational movement from said first mentioned drive shaft to said pump shaft.

6. A method for testing a hydraulic test pump having a charging inlet, a discharge outlet, and a rotor shaft, said method comprising:

connecting a dynamometer drive shaft to a rotational power source, so as to drive a hydraulic pump within said dynamometer;

said dynamometer having a tachometer for registering the rotational speed of said drive shaft;

priming the charging inlet of said test pump with hydraulic fluid from said dynamometer hydraulic circuit,

mechanically connecting said rotor shaft of said test pump to said drive shaft of said dynamometer whereby said rotor shaft will be rotated in response to rotation of said drive shaft;

measuring and registering the rate of flow of fluid exiting from said test pump,

measuring the rotational speed of said test pump with said tachometer of said dynamometer;

returning the fluid exiting from said test pump to the hydraulic circuit of said dynamometer pump;

comparing the rotational speed of said test pump with the rate of flow of fluid exiting from said pump to determine the efficiency of said pump.

7. A method according to claim 6 comprising regulating the pressure of fluid from said dynamometer pump to said charging inlet of said test pump at a predetermined charge pressure.