Measuring and testing – Blower – pump – and hydraulic equipment
Reexamination Certificate
1999-05-04
2001-11-20
Williams, Hezron (Department: 2856)
Measuring and testing
Blower, pump, and hydraulic equipment
C073S112060, C073S037000
Reexamination Certificate
active
06318167
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates generally to a test device and a testing process for determining the accuracy and efficiency of positive displacement gear pumps.
BACKGROUND OF THE INVENTION
Properly maintained gear pumps require volumetric metering and stream-to-stream accuracy throughout the life of the pump. Also, in order to ensure that the precision of the pump is established upon installation, and reestablished after routine maintenance, it is necessary to test the pumps prior to installation and after any maintenance. Traditionally, many fiber producers have custom-designed their own testers, or foregone testing altogether and relied upon their service technicians' expertise and their own testers. It is believed that most of these testers have utilized the “collect and weigh” method, where the output of the pump is collected for a period of time, and then compared to theoretical values to determine the efficiency of the pump. These testers, besides being messy and allowing contaminants into the test oil, require manual weighing, conversion from weight to volume based upon specific gravity at temperature, and calculation/recording of test results.
It is believed there is a demand for a fully-contained method of measuring volumetric accuracy which requires no weighing of output result, weight conversions, or manual recording/calculations, and eliminates mess and risk of contamination.
SUMMARY OF THE PRESENT INVENTION
The present invention provides a novel and unique test device and a testing process for determining the accuracy and efficiency of positive displacement gear pumps. The technique requires no weighing of output result, weight conversions, or manual recording/calculations, and eliminates the mess and risk of contamination.
According to the present invention, a series of hydraulic cylinders are arranged to receive the output fluid stream(s) from a test pump. Each fluid stream is directed to a separate hydraulic cylinder. A position sensor is connected to the cylinder piston to measure the stroke of the piston. After a predetermined number of revolutions of the drive shaft driving the gears of the test pump, the stroke of the cylinder piston is determined. Knowing the volume of the cylinder and the number of revolutions of the gears in the test pump, the output of the pump can be accurately and easily calculated.
The output of the pump is then compared with allowable limits, and the test results are displayed. The entire calculations can be performed using electronic circuitry such as a multiple transducer interface. Directional control valves control the flow to the test pump and to the hydraulic cylinders, and return the flow to a tank when the pump is not being tested. The directional control valves also direct flow to the opposite end of the hydraulic cylinders to purge and ready the cylinders for the next test.
Further features and advantages of the present invention will become apparent to those skilled in the art upon reviewing the following specification and attached drawings.
REFERENCES:
patent: 3270557 (1966-09-01), McClocklin
patent: 4368638 (1983-01-01), Groves et al.
patent: 4798086 (1989-01-01), Styfhoorn
patent: 4993259 (1991-02-01), LaFountain
patent: 5103671 (1992-04-01), Dyvig
patent: 5272917 (1993-12-01), Pippert
Hunter Christopher H.
Parker-Hannifin Corp.
Wiggins David J.
Williams Hezron
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