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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First Claim

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Patent Owner(s)

Patent OwnerAddressTotal Patents
SANYO ELECTRIC CO., LTD.OSAKA3326

International Classification(s)

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Hoshi, Katsuhiko Ohta, JP 5 119
Ohya, Satoshi Ohizumi, JP 21 158

Cited Art Landscape

Patent Info (Count) # Cites Year
 
CARRIER CORPORATION (1)
* 4,523,436 Incrementally adjustable electronic expansion valve 43 1983
 
ELSAG INTERNATIONAL B.V., A CORP. OF THE NETHERLANDS (1)
* 4,459,818 Supervisory control of chilled water temperature 11 1983
* Cited By Examiner

Patent Citation Ranking

Forward Cite Landscape

Patent Info (Count) # Cites Year
 
HITACHI, LTD. (1)
* 5,277,034 Air conditioning system 11 1992
 
RANCO OF DELAWARE (1)
* 5,156,017 Refrigeration system subcooling flow control valve 3 1991
 
ICE ENERGY TECHNOLOGIES, INC. (1)
* 2009/0133,412 THERMAL ENERGY STORAGE AND COOLING SYSTEM WITH MULTIPLE COOLING LOOPS UTILIZING A COMMON EVAPORATOR COIL 3 2008
 
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
 
EMERSON CLIMATE TECHNOLOGIES, INC. (17)
* 5,628,201 Heating and cooling system with variable capacity compressor 87 1995
7,905,098 Compressor diagnostic and protection system and method 10 2005
7,878,006 Compressor diagnostic and protection system and method 7 2005
8,590,325 Protection and diagnostic module for a refrigeration system 0 2007
8,393,169 Refrigeration monitoring system and method 2 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
8,964,338 System and method for compressor motor protection 0 2013
9,046,900 Method and apparatus for monitoring refrigeration-cycle systems 0 2013
9,086,704 Method and apparatus for monitoring a refrigeration-cycle system 0 2013
9,081,394 Method and apparatus for monitoring a refrigeration-cycle system 0 2013
9,023,136 Method and apparatus for monitoring a refrigeration-cycle system 0 2013
9,021,819 Method and apparatus for monitoring a refrigeration-cycle system 0 2013
9,017,461 Method and apparatus for monitoring a refrigeration-cycle system 0 2013
8,974,573 Method and apparatus for monitoring a refrigeration-cycle system 0 2013
 
ECOAIR CORP. (3)
* 5,203,179 Control system for an air conditioning/refrigeration system 63 1992
* 5,284,026 Control system for an air conditioning/refrigeration system 36 1993
* 5,335,507 Control system for an air conditioning/refrigeration system 58 1993
 
STARGATE INTERNATIONAL, INC. (1)
* 7,234,313 HVAC monitor and superheat calculator system 5 2004
 
GENERAL ELECTRIC COMPANY (12)
* 5,285,648 Differential pressure superheat sensor for low refrigerant charge detection 8 1992
* 5,243,829 Low refrigerant charge detection using thermal expansion valve stroke measurement 38 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 47 1994
* 5,431,026 Refrigerant flow rate control based on liquid level in dual evaporator two-stage refrigeration cycles 51 1994
* 5,426,952 Refrigerant flow rate control based on evaporator exit dryness 35 1994
* 5,415,008 Refrigerant flow rate control based on suction line temperature 39 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 46 1994
* 5,586,445 Low refrigerant charge detection using a combined pressure/temperature sensor 55 1994
* 6,438,978 Refrigeration system 15 1998
 
ELECTROLUX HOME PRODUCTS, INC. (1)
8,375,734 Fresh food ice maker control 0 2009
 
UUSI, LLC (1)
* 5,271,238 Environmental control system 7 1992
 
GREENER-ICE SPV, L.L.C. (1)
8,528,345 Managed virtual power plant utilizing aggregated storage 0 2012
 
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 11 1989
 
COPELAND CORPORATION LLC (2)
* 5,502,970 Refrigeration control using fluctuating superheat 31 1995
* 5,771,703 Refrigeration control using fluctuating superheat 21 1996
 
RANCO INCORPORATED OF DELAWARE (1)
* 5,177,973 Refrigeration system subcooling flow control valve 3 1991
 
COPELAND CORPORATION (1)
* 5,311,748 Control system for heat pump having decoupled sensor arrangement 11 1992
 
Kuba Kaltetechnik GmbH (1)
* 5,233,841 Method of optimising the performance of refrigerant vaporizers including improved frost control method and apparatus 19 1991
 
SPX CORPORATION (1)
* 5,231,842 Refrigerant handling system with liquid refrigerant and multiple refrigerant capabilities 10 1992
 
SANYO ELECTRIC CO., LTD. (1)
* 5,442,926 Control system for air-conditioner 8 1994
 
WINSLOW, JOHN M. (1)
* 5,209,400 Portable calculator for refrigeration heating and air conditioning equipment service 43 1991
 
Delta Design, Inc. (1)
6,993,922 Apparatus and method for controlling the temperature of an electronic device under test 23 2003
 
MITSUBISHI ELECTRIC CORPORATION (3)
8,899,058 Air conditioner heat pump with injection circuit and automatic control thereof 0 2006
RE43998 Refrigeration/air conditioning equipment 0 2010
RE43805 Refrigeration/air conditioning equipment 0 2010
 
EUBANK MANUFACTURING ENTERPRISES, INC., LONGVIEW, TX (1)
* 4,967,830 Arcuate tubular evaporator heat exchanger 6 1990
 
Sundstrand Corporation (1)
* 5,109,676 Vapor cycle system evaporator control 22 1990
 
DAIKIN INDUSTRIES, LTD. (1)
* 7,788,937 Refrigeration system 6 2006
 
FORD GLOBAL TECHNOLOGIES, LLC (1)
* 8,555,661 Air conditioning system for a motor vehicle and method for its operation 0 2008
 
B/E AEROSPACE, INC. (2)
* 6,109,047 Systems and methods for capacity regulation of refrigeration systems 11 1998
6,209,334 Systems and methods for capacity regulation of refrigeration systems 7 2000
 
TOKYO ELECTRON LIMITED (1)
* 6,629,423 Processor and temperature control method therefor 11 2002
* Cited By Examiner