Measuring and testing – Volume or rate of flow – Thermal type
Patent
1980-04-10
1982-01-19
Myracle, Jerry W.
Measuring and testing
Volume or rate of flow
Thermal type
73151, G01F 168
Patent
active
043110479
ABSTRACT:
The present invention detects the presence of liquid and it is used to control pumping of a well when the quantity of liquid being discharged by the pump per stroke is much less than the volumetric displacement of the pump.
A fluid detector (96) includes a first thermally conducting body (98), a first heater (100), a first temperature detector (108), insulation material (122, 124 and 136) for thermally insulating the first thermally conducting body, a second thermally conducting body (102) exposed to the inside of a conduit (104), a second heater (106) for heating the second thermally conducting body and a second temperature detector (110) for detecting the temperature of the second thermally conducting body or the second heater. One arrangement also includes an electrical bridge network (112) for comparing the relative rates of heat loss from the two thermally conducting bodies.
In one arrangement, a first positive temperature coefficient thermistor forms the first heater and the first temperature detector, and a second positive temperature coefficient thermistor forms the second heater and the second temperature detector.
In one arrangement, part of the insulation material forms a cylinder encircling the first thermally conducting body, the first heater, the second heater and part of the second thermally conducting body. The cylinder extends into the conduit and the second thermally conducting body extends out of the cylinder so that it is exposed to the inside of the conduit.
REFERENCES:
patent: 2707440 (1955-05-01), Long et al.
patent: 3438254 (1969-04-01), Seeley
patent: 3570310 (1971-03-01), Densmore
Westerman, G. W., Successful Application . . . Controllers, SPE paper 6853 of AIME, Denver, Colorado, Oct. 1977.
Granberry, Jr. Walter E.
Hubbard, Jr. Charlie J.
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