Differential pressure sensor for screw compressors

Details Differential pressure sensor for screw compressors Differential pressure sensor for screw compressors

1992-06-02

1993-06-15

Lazarus, Ira S.

Lubrication

Safety alarm or indicating means

184 64, 73722, 336 30, 338 42, 340626, F01M 120

Patent

active

052190412

ABSTRACT:
A pressure sensor, such as the type of sensor used in screw-type refrigeration compressors, permits sensing of positive as well as negative pressures and provides an indication of the direction in which the compressor is rotating. Negative pressure leads to system shut-down, while positive pressure verification will allow compressor operation to continue. The pressure sensor includes a pair of adjustable tension springs, on opposite sides of the diaphragm, to vary the position of the diaphragm within its mechanical stroke. By establishing a pressure range of interest, and by employing an electrical sensor, such as a Hall effect sensor, the direction of movement of the diaphragm and sensor can be monitored immediately upon compressor start-up.

REFERENCES:
patent: 2692501 (1954-10-01), Erwood
patent: 3884079 (1975-05-01), Turtle et al.
patent: 4381678 (1983-05-01), Lombard et al.
patent: 4449112 (1984-05-01), Gould
patent: 4551069 (1985-11-01), Gilmore
patent: 4672231 (1987-06-01), Sutton et al.
patent: 5024294 (1991-06-01), Van Fossen et al.

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