Refrigerant flow rate control based on evaporator dryness

Number of patents in Portfolio can not be more than 2000

United States of America Patent

PATENT NO 5425246
SERIAL NO

08222052

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ATTORNEY / AGENT: (SPONSORED)

Importance

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Abstract

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Pulse width modulation is used to control the flow rate through a solenoid expansion valve in a refrigeration system. A first temperature sensor is located near the evaporator inlet, and a second temperature sensor is disposed in a compartment to be cooled. A controller is included for controlling the duty cycle of the pulse width modulated solenoid valve. The controller receives inputs from the two temperature sensors and controls the valve duty cycle based on the difference of the two temperatures. The second temperature sensor is preferably located on the back wall of the compartment and can be adjacent to the compartment air inlet, adjacent to the compartment air outlet, or between the air inlet and air outlet.

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First Claim

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Patent Owner(s)

Patent OwnerAddressTotal Patents
GENERAL ELECTRIC COMPANYSCHENECTADY, NY18726

International Classification(s)

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Bessler, Warren F Schenectady, NY 20 609

Cited Art Landscape

Patent Info (Count) # Cites Year
 
GENERAL ELECTRIC COMPANY (1)
* 4910972 Refrigerator system with dual evaporators for household refrigerators 36 1989
 
SANYO ELECTRIC CO., LTD. (1)
* 4745767 System for controlling flow rate of refrigerant 75 1987
 
Other [Check patent profile for assignment information] (1)
* 4651535 Pulse controlled solenoid valve 45 1984
 
UUSI, LLC (1)
* 5255529 Environmental control system 48 1992
 
WHIRLPOOL CORPORATION (1)
* 5255530 System of two zone refrigerator temperature control 48 1992
 
Mydax, Inc. (1)
* 4934155 Refrigeration system 30 1989
 
EMERSON ELECTRIC CO. (1)
* 4685309 Pulse controlled expansion valve for multiple evaporators and method of controlling same 24 1986
 
Lab-Line Instruments, Inc. (1)
* 5247989 Modulated temperature control for environmental chamber 18 1992
 
Zexel Corporation (1)
* 4677830 Air conditioning system for automotive vehicles 69 1985
 
HITACHI, LTD. (1)
* 4653288 Apparatus for measuring refrigerant flow rate in refrigeration cycle 26 1985
 
Kuba Kaltetechnik GmbH (1)
* 5233841 Method of optimising the performance of refrigerant vaporizers including improved frost control method and apparatus 29 1991
* Cited By Examiner

Patent Citation Ranking

Forward Cite Landscape

Patent Info (Count) # Cites Year
 
SANYO ELECTRIC CO., LTD. (1)
* 5598717 Air conditioner having frost preventing member 4 1995
 
GENERAL ELECTRIC COMPANY (3)
* 5655379 Refrigerant level control in a refrigeration system 64 1995
* 5904049 Refrigeration expansion control 39 1997
6438978 Refrigeration system 23 1998
 
ZHEJIANG DUNAN HETIAN METAL CO., LTD. (1)
* 9235219 Microvalve with integrated flow sensing capability 0 2013
 
EMERSON CLIMATE TECHNOLOGIES, INC. (13)
* 5628201 Heating and cooling system with variable capacity compressor 104 1995
RE44636 Compressor capacity modulation 0 2005
RE40830 Compressor capacity modulation 8 2005
7419365 Compressor with capacity control 5 2006
7654098 Cooling system with variable capacity control 6 2006
* 2007/0022,771 Cooling system with variable capacity control 6 2006
8157538 Capacity modulation system for compressor and method 1 2008
9541907 System and method for calibrating parameters for a refrigeration system with a variable speed compressor 0 2008
8308455 Unloader system and method for a compressor 1 2010
8807961 Capacity modulation system for compressor and method 0 2012
9494354 System and method for calculating parameters for a refrigeration system with a variable speed compressor 0 2013
9494158 Variable speed compressor protection system and method 0 2013
9476625 System and method for monitoring compressor floodback 0 2015
 
DANFOSS A/S (2)
* 9217591 Method for controlling a flow of refrigerant to an evaporator 0 2009
* 2011/0214,438 METHOD FOR CONTROLLING A FLOW OF REFRIGERANT TO AN EVAPORATOR 1 2009
* Cited By Examiner