US Patent No: 4,745,767

Number of patents in Portfolio can not be more than 2000

System for controlling flow rate of refrigerant

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Importance

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Abstract

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A system for controlling the flow rate of a refrigerant for refrigeration cycles which comprises an electronic expansion valve disposed at the inlet of an evaporator and a controller for controlling the opening-closing movement of the valve. The controller comprises a calculating unit for comparing the degree of superheat of the refrigerant measured at the evaporator with a preset degree of superheat and feeding a valve opening adjusting signal to the valve according to the value obtained by the comparison, and a valve full-closing signal generator for comparing the measured temperature of the space to be cooled with a preset temperature and feeding a valve full-closing signal to the valve based on the value obtained from the comparison of temperatures, in preference to the opening adjusting signal.

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Patent Owner(s)

Patent OwnerAddressTotal Patents
SANYO ELECTRIC CO., LTD.OSAKA6000

International Classification(s)

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Hoshi, Katsuhiko Ota, JP 5 101
Ohya, Satoshi Tokyo, JP 24 140

Cited Art Landscape

Patent Info (Count) # Cites Year
 
CARRIER CORPORATION (1)
4,523,436 Incrementally adjustable electronic expansion valve 35 1983
 
ELSAG INTERNATIONAL B.V., A CORP. OF THE NETHERLANDS (1)
4,459,818 Supervisory control of chilled water temperature 11 1983

Patent Citation Ranking

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Patent Info (Count) # Cites Year
 
GENERAL ELECTRIC COMPANY (12)
5,285,648 Differential pressure superheat sensor for low refrigerant charge detection 7 1992
5,243,829 Low refrigerant charge detection using thermal expansion valve stroke measurement 30 1992
5,301,514 Low refrigerant charge detection by monitoring thermal expansion valve oscillation 18 1992
5,435,145 Refrigerant flow rate control based on liquid level in simple vapor compression refrigeration cycles 39 1994
5,431,026 Refrigerant flow rate control based on liquid level in dual evaporator two-stage refrigeration cycles 43 1994
5,426,952 Refrigerant flow rate control based on evaporator exit dryness 27 1994
5,415,008 Refrigerant flow rate control based on suction line temperature 31 1994
5,463,876 Control system for refrigerant metering solenoid valve 16 1994
5,425,246 Refrigerant flow rate control based on evaporator dryness 12 1994
5,546,757 Refrigeration system with electrically controlled expansion valve 38 1994
5,586,445 Low refrigerant charge detection using a combined pressure/temperature sensor 46 1994
6,438,978 Refrigeration system 13 1998
 
EMERSON CLIMATE TECHNOLOGIES, INC. (9)
5,628,201 Heating and cooling system with variable capacity compressor 72 1995
7,905,098 Compressor diagnostic and protection system and method 2 2005
7,878,006 Compressor diagnostic and protection system and method 5 2005
8,590,325 Protection and diagnostic module for a refrigeration system 0 2007
8,393,169 Refrigeration monitoring system and method 0 2008
8,160,827 Compressor sensor module 1 2008
8,475,136 Compressor protection and diagnostic system 0 2010
8,474,278 Compressor diagnostic and protection system and method 0 2011
8,335,657 Compressor sensor module 0 2011
 
ECOAIR CORP. (3)
5,203,179 Control system for an air conditioning/refrigeration system 54 1992
5,284,026 Control system for an air conditioning/refrigeration system 28 1993
5,335,507 Control system for an air conditioning/refrigeration system 47 1993
 
BE AEROSPACE, INC. (2)
6,109,047 Systems and methods for capacity regulation of refrigeration systems 10 1998
6,209,334 Systems and methods for capacity regulation of refrigeration systems 5 2000
 
CARRIER CORPORATION (2)
6,148,628 Electronic expansion valve without pressure sensor reading 9 1999
6,318,100 Integrated electronic refrigerant management system 11 2000
 
COPELAND CORPORATION LLC (2)
5,502,970 Refrigeration control using fluctuating superheat 26 1995
5,771,703 Refrigeration control using fluctuating superheat 21 1996
 
MITSUBISHI ELECTRIC CORPORATION (2)
RE43998 Refrigeration/air conditioning equipment 0 2010
RE43805 Refrigeration/air conditioning equipment 0 2010
 
Robertshaw Controls Company (2)
4,848,652 Vehicle engine coolant system and method of making the same 10 1988
4,969,628 Valve construction and method of making the same 9 1989
 
COPELAND CORPORATION (1)
5,311,748 Control system for heat pump having decoupled sensor arrangement 9 1992
 
DAIKIN INDUSTRIES, LTD. (1)
7,788,937 Refrigeration system 2 2006
 
DELTA DESIGN, INC. (1)
6,993,922 Apparatus and method for controlling the temperature of an electronic device under test 20 2003
 
ELECTROLUX HOME PRODUCTS, INC. (1)
8,375,734 Fresh food ice maker control 0 2009
 
EUBANK MANUFACTURING ENTERPRISES, INC., LONGVIEW, TX (1)
4,967,830 Arcuate tubular evaporator heat exchanger 6 1990
 
FORD GLOBAL TECHNOLOGIES, LLC (1)
8,555,661 Air conditioning system for a motor vehicle and method for its operation 0 2008
 
HITACHI, LTD. (1)
5,277,034 Air conditioning system 10 1992
 
ICE ENERGY TECHNOLOGIES, INC. (1)
8,528,345 Managed virtual power plant utilizing aggregated storage 0 2012
 
Kuba Kaltetechnik GmbH (1)
5,233,841 Method of optimising the performance of refrigerant vaporizers including improved frost control method and apparatus 11 1991
 
RANCO INCORPORATED OF DELAWARE (1)
5,156,017 Refrigeration system subcooling flow control valve 3 1991
 
RANCO INCORPORATED OF DELAWARE (1)
5,177,973 Refrigeration system subcooling flow control valve 3 1991
 
SANYO ELECTRIC CO., LTD. (1)
5,442,926 Control system for air-conditioner 8 1994
 
SPX CORPORATION (1)
5,231,842 Refrigerant handling system with liquid refrigerant and multiple refrigerant capabilities 10 1992
 
STARGATE INTERNATIONAL, INC. (1)
7,234,313 HVAC monitor and superheat calculator system 3 2004
 
Sundstrand Corporation (1)
5,109,676 Vapor cycle system evaporator control 13 1990
 
TOKYO ELECTRON LIMITED (1)
6,629,423 Processor and temperature control method therefor 9 2002
 
UUSI, LLC (1)
5,271,238 Environmental control system 7 1992
 
WINSLOW, JOHN M. (1)
5,209,400 Portable calculator for refrigeration heating and air conditioning equipment service 35 1991