Refrigeration – With indicator or tester – Condition sensing
Patent
1992-10-21
1994-02-15
Tanner, Harry B.
Refrigeration
With indicator or tester
Condition sensing
200 83P, F25B 4902
Patent
active
052856488
ABSTRACT:
Low charge detection for a refrigeration system is accomplished using a differential pressure sensor which detects superheat at the evaporator exit. The differential pressure sensor includes a casing having a reference chamber containing a reference charge of refrigerant. A pressure responsive snap member is disposed in the casing so as to have one side exposed to the reference chamber and another side exposed to the exit pressure of the evaporator. The snap member is normally biased into a first position but snaps to a second position when the pressure differential across it exceeds a predetermined level. When a low charge condition exits, the evaporator exit will exhibit superheat. Heat conduction through the casing raises the temperature, and thus the pressure in the reference chamber. Thus the pressure differential which causes the snap member to snap to the second position is created. A switch which opens and closes in response to the movement of the pressure responsive snap member is located in the casing. The switch can be connected to deactivate the system compressor, activate an indicator, or do both in response to excess superheat being detected.
REFERENCES:
patent: 2795189 (1957-06-01), Haberland
patent: 3383031 (1968-05-01), Ellis et al.
patent: 3698204 (1972-10-01), Schlotterbeck et al.
patent: 3913347 (1975-10-01), Stevens
patent: 4006083 (1977-02-01), Westervelt et al.
patent: 4167858 (1979-09-01), Kojima et al.
patent: 4220836 (1980-09-01), Hersey
patent: 4651535 (1987-03-01), Alsenz
patent: 4653288 (1987-03-01), Sayo et al.
patent: 4677830 (1987-07-01), Sumikawa et al.
patent: 4745765 (1988-05-01), Pettitt
patent: 4745767 (1988-05-01), Ohya et al.
General Electric Company
Scanlon Patrick R.
Tanner Harry B.
Webb II Paul R.
LandOfFree
Differential pressure superheat sensor for low refrigerant charg does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Differential pressure superheat sensor for low refrigerant charg, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Differential pressure superheat sensor for low refrigerant charg will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1199449