F - Mech Eng,Light,Heat,Weapons – 16 – K
Patent
F - Mech Eng,Light,Heat,Weapons
16
K
62/143, 341/27,
F16K 39/02 (2006.01) F25B 41/04 (2006.01) F25B 41/06 (2006.01) G05D 23/20 (2006.01)
Patent
CA 1091940
ABSTRACT OF THE DISCLOSURE The invention related 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 well of an expansible chamber filled with a refrigerant medium having vapour and liquid phases. The pressure exerted by the vapour 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 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 ha an output for heating the heating resistor in the expandable chamber and a summating section for varying the relative effects of the input branches on the output.
314727
Huelle Zbigniew R.
Jakobsen Jakob S.
Nielsen Leif
Danfoss A/s
Macrae & Co.
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