Automatic temperature and humidity regulation – Motors – Relay
Patent
1983-11-21
1984-10-09
Tanner, Harry
Automatic temperature and humidity regulation
Motors
Relay
236 80G, 62212, 62225, 251 11, F25B 4104, G05D 2300, F16K 3100
Patent
active
044756860
ABSTRACT:
The invention relates to a valve assembly for a refrigeration plant of the kind used for controlling the flow of refrigerant from the evaporator to the compressor. The closure member for the valve unit is controlled directly or indirectly by a movable wall of an expansible chamber filled with a refrigerant medium having vapor and liquid phases. The pressure exerted by the vapor phase of the medium provides a bias in a valve opening direction which is directly related to the temperature of the liquid phase and is opposed by a spring bias in the valve closing direction. A heat transfer element such as a heating resistor in the liquid phase is heated or allowed to cool in a controlled manner by an external control unit. A temperature responsive sensor element in the liquid phase of the medium is part of a feedback system for the control unit which allows a selected temperature to be maintained in the chamber which results in a desired constant pressure in a valve opening direction to be maintained in a chamber. A control unit has an evaporator parameter input branch and a second input branch for the feedback temperature sensing element. The control unit has an output for heating the heating resistor in the expansible chamber and a summating section for varying the relative effects of the input branches on the output.
REFERENCES:
patent: 1905683 (1933-04-01), Carraway
patent: 2534455 (1950-12-01), Koontz
patent: 3265303 (1966-08-01), Harris
patent: 3279778 (1966-10-01), Jespersen
patent: 3500634 (1970-03-01), Waseleski, Jr. et al.
patent: 3664581 (1972-05-01), Stannow
patent: 3860169 (1975-01-01), Norman
patent: 4171087 (1979-10-01), Kunz
Huelle Zbigniew R.
Jakobsen Jakob S.
Nielsen Leif
Danfoss A/S
Easton Wayne B.
Tanner Harry
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