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| Number | Title | Issue Date |
| 7743618 | Auger type ice making machine An auger type ice making machine is provided with a freezing cylinder into which water for making ice is supplied, an ice-scraping auger for scraping ice formed on the inner surface of the freezing cylinder, and an auger motor for driving the ice-scraping auger. A f... | 06/29/2010 |
| 7509817 | Cooling cycle apparatus and method of controlling linear expansion valve of the same Disclosed herein is a method of controlling a linear expansion valve of a cooling cycle apparatus. The method comprises a first step of calculating a target opening level value according to suction overheat level of compressors to control a linear expansion valve ba... | 03/31/2009 |
| 7409833 | Dual mode compressor with automatic compression ratio adjustment for adapting to multiple operating conditions An apparatus and method for compressing gas refrigerant using two different compressors operated alternatively in a series or parallel mode for obtaining two different compression ratios and thereby provide efficient operation for both a relatively lower suction pre... | 08/12/2008 |
| 7389648 | Pressure regulation in a transcritical refrigerant cycle A refrigerant cycle is provided with a control for an expansion device to achieve a desired compressor discharge pressure. The system operates transcritically, such that greater freedom over compressor discharge pressure is provided. The system's efficiency is optim... | 06/24/2008 |
| 7342756 | Fault recognition in systems with multiple circuits A method for detecting compressor or system degradation or malfunction in a multiple circuit compressor system includes the steps of providing a multiple circuit compressor system including at least a first circuit and a second circuit; and comparing a first value c... | 03/11/2008 |
| 7337625 | Thermal control systems for process tools requiring operation over wide temperature ranges A system and method for maintaining the temperature of a thermal transfer fluid at a selectable level within a wide temperature range, so as to operate a process tool in a chosen mode employing at lease two cascaded stages, each operating with a different fluid in a... | 03/04/2008 |
| 7336044 | Direct current motor control circuit A DC motor control circuit includes a pair of substantially identical unipolar control circuits. Each of the unipolar control circuits are connected between a respective current source and a current input to the motor. Each of the unipolar control circuits includes ... | 02/26/2008 |
| 7331196 | Refrigerating apparatus and refrigerator In the case that heat absorbing means that function in selectively different temperature ranges, are provided in a refrigerating cycle, an object is to provide a refrigerating apparatus capable of suppressing the deterioration of efficiency in either temperature ran... | 02/19/2008 |
| 7299646 | Expansion valve having solenoid relief valve An expansion valve has a solenoid relief valve equipped in an air conditioner for decompressing and expands a refrigerant and supplies the same to an evaporator. A high-pressure refrigerant from a compressor enters a valve chamber. The refrigerant traveling towards ... | 11/27/2007 |
| 7263849 | Refrigerating system for refrigerator A refrigerating system for a refrigerator is disclosed. The refrigerator includes a compressor that compresses refrigerant, a condenser connected to the compressor that condenses compressed refrigerant, an expansion valve connected to the condenser that expands cond... | 09/04/2007 |
| 7205533 | Cooling apparatus A cooling apparatus (10) for cooling a detector (52), the cooling apparatus including an inner and an outer countercurrent heat exchanger (12 and 14, respectively) for a first and a second gas in a thermally insulating housing (16)... | 04/17/2007 |
| 7134294 | Method and apparatus for refrigeration system control having electronic evaporator pressure regulators A method and apparatus for refrigeration system control includes a control system operable to meet cooling demand and control suction pressure for a plurality of refrigeration circuits each including a variable valve and an expansion valve. The controller controls t... | 11/14/2006 |
| 7104079 | Heat pump A heat pump apparatus that having a refrigerating cycle including a compressor, a gas cooler, a pressure reducing device and an evaporator and is designed so that water can be heated by the gas cooler. A refrigerant such as CO2 or the like working in a su... | 09/12/2006 |
| 7086246 | Cooling apparatus for fuel cell utilizing air conditioning system A cooling circuit of a cooling apparatus for a fuel cell comprises a compressor for compressing a gaseous refrigerant, an external heat exchanger arranged on the downstream side of the compressor and for liquefying the compressed refrigerant, a pressure-reducing mea... | 08/08/2006 |
| 6951116 | Air conditioner and method for controlling electronic expansion valve of air conditioner Disclosed are an air conditioner in which one or more compressors are operated so that the refrigerant compression capacity of the operating compressor(s) is variably changed in accordance with a cooling or heating load for cooling or heating air in a room, and a me... | 10/04/2005 |
| 6951117 | Vapor compression system and method for controlling conditions in ambient surroundings A vapor compression system (10) including an evaporator (16), a compressor (12), and a condenser (14) interconnected in a closed-loop system. In one embodiment, a multifunctional valve (18) is configured to receive a liquefied heat... | 10/04/2005 |
| 6941767 | Compression mechanism oil equalizing circuit, refrigeration system heat source unit, and refrigeration system provided with the same The present invention provides an oil equalizing circuit that can improve the reliability of the oil supply to the compression mechanisms in a refrigeration system provided with a plurality of compression mechanisms. The compressor group of the air conditioning syst... | 09/13/2005 |
| 6942160 | Expansion valve An evaporator 10 of an air conditioner comprises a refrigerant entrance port 12 and a refrigerant exit port 14. A division wall 16 of the evaporator is extended to form a housing 200. The housing 200 comprises an inlet 21... | 09/13/2005 |
| 6909283 | Method and system to regulate cooling of a medical imaging device The present invention provides a system and method of removing heat from an MR imaging device while maintaining internal and external temperatures below maximum operating limits, thereby enabling higher power applications for faster imaging with improved image quali... | 06/21/2005 |
| 6779356 | Apparatus and method for controlling operation of air conditioner Disclosed are an apparatus and a method for controlling the operation of an air conditioner, in which one or more compressors are operated so that the total refrigerant compression capacity of the operating compressors is variably changed according to a cooling or h... | 08/24/2004 |
| 6634567 | Expansion valve unit having pressure detecting function An expansion valve unit having a pressure detecting function includes a supercooling control expansion valve disposed in a flow path of a refrigerant sent into an evaporator of a refrigeration system constituting a refrigerating cycle to control the flow ... | 10/21/2003 |
| 6598404 | Cooling apparatus Described herein is a temperature control system for cooling magnetic elements (14) in MRI apparatus (10). The control system comprises a wax (16) in contact with the elements (14) which is substantially maintained at its phase transition temperature betw... | 07/29/2003 |
| 6574977 | Heat pump cycle In a heat pump cycle, a first high-pressure side heat exchanger is disposed to perform a heat exchange between refrigerant discharged from a compressor and a first fluid, and a second high-pressure side heat exchanger is disposed to perform a heat exchang... | 06/10/2003 |
| 6564565 | Air conditioning system and method Disclosed is an air conditioning system and method employing at least two compressors so as to improve the refrigeration efficiency, in which expansion of a refrigerant in an expansion section is controlled according to a used state of the compressors dep... | 05/20/2003 |
| 6505476 | Refrigerant cycle system with super-critical refrigerant pressure In a refrigerant cycle system, a control unit controls both a refrigerant amount discharged from a compressor and an opening degree of a pressure control valve so that theoretical efficiency of a super-critical refrigerant cycle and efficiency of the comp... | 01/14/2003 |
| 6467289 | Hot-water supply system with heat pump cycle In a hot-water supply system with a heat pump cycle, a control unit controls operation of an expansion valve based on a temperature difference between a refrigerant temperature at an outlet side of a refrigerant passage in a water heat exchanger and a wat... | 10/22/2002 |
| 6367269 | Electronic throttling valve diagnosis and preventative shutdown control A method of controlling the operation of an electronic throttling valve in a temperature control unit having first and second pressure measurement devices. The method includes determining whether the first pressure measurement device is functioning, deter... | 04/09/2002 |
| 6357242 | Control system and method for suppressing head pressure spikes in a vehicle air conditioning system An improved system and method for suppressing high side pressure transients in a motor vehicle air conditioning system due to engine speed transients during vehicle acceleration through the use of a throttling valve. The throttling valve may be mechanical... | 03/19/2002 |
| 6311512 | Refrigerated merchandiser system A refrigerated merchandiser system (10) includes a compressor (20), a condenser (30), a display case (100) having an evaporator (40), an expansion device (50) and an evaporator pressure control device (60) connected in a closed refrigerant circuit via ref... | 11/06/2001 |
| 6272870 | Refrigeration system having a pressure regulating device A system for use in regulating the flow of a working fluid, such as a refrigerant, is provided which includes a pressure regulating device. The pressure regulating device controls the mass flow rate of the working fluid in the refrigeration system. The pr... | 08/14/2001 |
| 6253562 | Refrigerant subcooler for vapor compression refrigeration system A subcooling unit within a vapor compression refrigerant system contains a controller for controlling the rate of flow of refrigerant into the chamber of the subcooling unit. The controller receives a sensed temperature of the fluid entering a condensing ... | 07/03/2001 |
| 6250093 | Air conditioning system and compressor An improved air conditioning system that cools or heats air very rapidly after being started. The system includes a main heater and a cooler which also functions as an auxially heater. The cooler includes a variable displacement compressor for compressing... | 06/26/2001 |
| 6216477 | Regulating device for air conditioner refrigerant circuit A control device is provided for a refrigerant circuit of an air conditioner, divided by a compressor and a vent element into a high-pressure side and a low-pressure side. The control device includes a high-pressure-side control part and a low-pressure-si... | 04/17/2001 |
| 6182456 | Supercritical refrigerating cycle system A CO2 cycle system having a variable capacity compressor is controlled even when the refrigerant delivery capacity of the variable capacity compressor changes. When the refrigerant delivery capacity of the variable capacity compressor decreases... | 02/06/2001 |
| 6161394 | Method and apparatus for condensing and subcooling refrigerant This invention provides a refrigeration system which includes in a closed loop connection a compressor for compressing a refrigerant into a condenser for condensing the compressed refrigerant into a liquid refrigerant, a control valve to controlling the d... | 12/19/2000 |
| 6141980 | Evaporator generated foam control of compression systems A system for controlling the amount of foam ingested to a compressor of a cooling system is presented. The present invention utilizes a heated thermistor to control an electrically positioned expansion valve feeding liquid refrigerant to a system evaporat... | 11/07/2000 |
| 6134900 | Supercritical refrigerating system When a compressor is stopped, a refrigerant passage in which refrigerant flows from a radiator to an evaporator is closed by a pressure control valve. Accordingly, even after the compressor is stopped, a high-pressure side pressure can be prevented from d... | 10/24/2000 |
| 6101827 | Temperature comparison circuit and refrigeration expansion valve Temperature comparison circuits which utilize two thermistors which are initially set up in a balanced bridge using NPN transistors and resistors. As temperature differences between the thermistors cause the bridge to become unbalanced, there is a current... | 08/15/2000 |
| 6092379 | Supercritical refrigerating circuit The supercritical refrigerating circuit has a first pressure reducing valve for reducing pressure of refrigerant flows into a first evaporator and a second pressure reducing valve for reducing pressure of refrigerant flows into a second evaporator. The fi... | 07/25/2000 |
| 6070421 | 5 or 8 kW refrigerating system and centrifugal compressor assembly for said system A refrigerating system has a condenser, an evaporator, and a two-stage centrifugal compressor assembly with an electric motor provided with a cooling system. A condenser inlet is connected to a compressor assembly outlet, while a condenser outlet is conne... | 06/06/2000 |
