Plural Compressors Or Multiple Effect Compression Patents (Class 62/510)
-
Patent number: 6735973Abstract: Multi-type air conditioner including a plurality of distributors each including a gas-liquid separator for separating refrigerant from the outdoor unit into gas refrigerant and liquid refrigerant, and distributor pipelines for guiding the gas or liquid refrigerant separated at the gas-liquid separator to the indoor units, and guiding the refrigerant passed through the indoor unit to the outdoor unit again, and an equalizing pipeline part for connecting the distributors for equal supply of refrigerant, thereby installing the indoor unit easily, and improving an air conditioning efficiency by supplying the refrigerant, equally.Type: GrantFiled: June 12, 2003Date of Patent: May 18, 2004Assignee: LG Electronics Inc.Inventor: Chang Seon Lee
-
Patent number: 6732542Abstract: A defroster restrains a vane jump that takes place when an evaporator is defrosted in a refrigerant circuit using a so-called internal intermediate-pressure type double-stage compression rotary compressor. The defroster includes a rotary compressor that discharges a refrigerant gas that has been compressed by a first rotary compressing unit into a hermetic vessel and further compresses the discharged intermediate-pressure refrigerant gas, a gas cooler, an expansion valve, and an evaporator. To defrost the evaporator, the refrigerant gas discharged from the second rotary compressing unit is introduced into the evaporator without decompressing it by the expansion valve. Furthermore, the refrigerant gas discharged from the first rotary compressing unit is introduced into the evaporator. At the same time, an electromotive unit of the rotary compressor is run at a predetermined number of revolutions.Type: GrantFiled: November 6, 2002Date of Patent: May 11, 2004Assignee: Sanyo Electric Co., Ltd.Inventors: Haruhisa Yamasaki, Masaya Tadano, Kenzo Matsumoto, Kazuya Sato, Dai Matsuura, Takayasu Saito
-
Patent number: 6722156Abstract: A refrigeration system includes a chiller unit and a freezer unit. The freezer unit is provided with a freezing compressor for compressing a refrigerant in a total of two stages together with a compressor in an outdoor unit. The freezing compressor is formed by an inverter compressor. An oil separator is disposed on the discharge pipe of the freezing compressor. On the inlet pipe of the freezing compressor, a heat exchanger is provided for cooling an inverter with an refrigeration oil separated by the oil separator and a suction refrigerant.Type: GrantFiled: June 6, 2002Date of Patent: April 20, 2004Assignee: Daikin Industries, Ltd.Inventors: Kenji Tanimoto, Takeo Ueno, Masaaki Takegami, Kazuyoshi Nomura
-
Patent number: 6722143Abstract: An air conditioning apparatus and control method thereof is provided, in which two-stage variable-capacity compressors are connected in parallel with each other to control capacities of the two stage variable-capacity compressors according to indoor air conditioning loads. A pair of two-stage variable-capacity compressors are used in the air conditioning apparatus to be cost competitive and can obtain an effect in which the pair of two-stage variable-capacity compressors are controlled as if a large-scale variable-capacity compressor with a capacity the same as a total capacity of the two compressors were linearly controlled.Type: GrantFiled: November 27, 2002Date of Patent: April 20, 2004Assignee: Samsung Electronics Co., Ltd.Inventors: Je-Myoung Moon, Jong-Youb Kim, Dong-Kue Lee, Il-Yong Cho
-
Patent number: 6715305Abstract: A refrigerator has a refrigerant circuit that is comprised of; a power-variable two-stage compressor, a variable throttler, which are computer controlled; and a first evaporator for fresh food compartments and a second evaporator for freezer compartments. Temperatures in the first and second evaporators are controlled independently from each other, by controlling throttling extent of the variable throttler. Temperature in the first evaporator is kept in a range not causing frost formation on surface of the first evaporator, for example in a range from −2° C. to 2° C., by controlling the throttling extent as well as the power of the compressor. In a preferred embodiment, the variable throttler is a pulse motor valve at downstream of a condenser and at upstream of the first evaporator.Type: GrantFiled: January 3, 2003Date of Patent: April 6, 2004Assignee: Kabushiki Kaisha ToshibaInventors: Takashi Doi, Akihiro Noguchi
-
Publication number: 20040050093Abstract: A vapor compression system includes a first circuit having first components including a first compressor, a first condenser and a first evaporator; a second circuit having second components including a second compressor, a second condenser and a second evaporator; and interconnecting flow lines for selectively communicating the first compressor with at least one component of the second components to boost system performance at part-load operation as well as enhance its reliability and improve unloading capability.Type: ApplicationFiled: September 18, 2002Publication date: March 18, 2004Inventors: Alexander Lifson, Michael F. Taras, Howard H. Fraser
-
Patent number: 6698234Abstract: The efficiency of a vapor compression system is increased by coupling the evaporator with either the intercooler of a two-stage vapor compression system or the compressor component. The refrigerant in the evaporator accepts heat from the compressor component or the refrigerant in the intercooler, heating the evaporator refrigerant. As pressure is directly related temperature, the low side pressure of the system increases, decreasing compressor work and increasing system efficiency. Additionally, as the heat from the compressor component or from the refrigerant in the intercooler is rejected to the refrigerant in the evaporator, the compressor is cooled, increasing the density and the mass flow rate of the refrigerant to further increase system efficiency.Type: GrantFiled: March 20, 2002Date of Patent: March 2, 2004Assignee: Carrier CorporationInventors: Sivakumar Gopalnarayanan, Tobias H. Sienel, Lili Zhang
-
Patent number: 6694773Abstract: A condenser system (20) includes a first header (26), a second header (28), and parallel tubes (30) extending between the headers (26, 28). A receiver (24), affixed to the second header (28), is in fluid communication with the second header (28). The receiver includes a body (32), a first cap (38) coupled to the body (32), and a second cap (42) coupled to the body. The condenser system (20) is subjected to a one-shot brazing process that nondetachably couples the receiver (24) to the second header (28), and concurrently nondetachably couples the first and second caps (38, 42) to the receiver body (32). A desiccant system (124) and/or filter (138) may be optionally installed into the receiver (24) prior to brazing.Type: GrantFiled: January 29, 2003Date of Patent: February 24, 2004Assignee: CalsonicKansei North America, Inc.Inventors: James D. Snow, John W. Knecht
-
Patent number: 6672102Abstract: A vaporizer for boiling off a liquid refrigerant from a combined liquid refrigerant/lubricant mixture tapped from an evaporator utilizes hot compressed gaseous refrigerant tapped from a location upstream of the condenser. In a preferred embodiment, the refrigerant is tapped from a compression chamber within the compressor. The hot refrigerant efficiently boils the liquid refrigerant out of the mixture, ensuring high viscosity lubricant. In further features, a return lubricant line from the compressor passes into a sump to further boil off liquid refrigerant.Type: GrantFiled: November 27, 2002Date of Patent: January 6, 2004Assignee: Carrier CorporationInventors: Edward A. Huenniger, Nadine Thompson, Joseph A. Catrambone
-
Publication number: 20030233838Abstract: Disclosed are an air conditioning system with two compressors so as to shorten standby time for re-operating a stopped compressor and variably change the compression capacity of a refrigerant according to cooling load, and a method for operating the air conditioning system. The method for operating the air conditioning system with two compressors, comprises the first step of simultaneously operating the compressors regardless of cooling load at an early stage of the operation, the second step of selectively operating one of the compressors according to the cooling load, and the third step of additionally re-operating the stopped compressor when the operated compressor selected from the compressor in the second step is continuously operated for longer than a designated time, thereby shortening the standby time for re-operating the stopped compressor, rapidly changing the compression capacity of the refrigerant according to the cooling load, and improving users' comfort within a room.Type: ApplicationFiled: March 4, 2003Publication date: December 25, 2003Applicant: LG Electronics Inc.Inventors: Won Hee Lee, Chang Min Choi, Yoon Jei Hwang, Deok Huh, Cheol Min Kim
-
Publication number: 20030233836Abstract: An object of the present invention is to continue operation as it is without inducing any degradation of performance of a compressor even if one of compressors is broken down in a refrigeration apparatus which can freely cool or warm the inside of a room, cool a refrigerating show case and cool a freezing show case. A refrigeration apparatus (1) comprises a non-inverter compressor (2A), a first inverter compressor (2B) and a second inverter compressor (2C). If the first inverter compressor (2B) is broken down during a cooling/freezing operation in which a cooling operation is performed by an inside heat exchanger (41), a refrigerating heat exchanger (45) and a freezing heat exchanger (51), the operation is continued by opening a solenoid valve (7a) disposed on a first sub pipe (23).Type: ApplicationFiled: February 24, 2003Publication date: December 25, 2003Inventors: Kenji Tanimoto, Masaaki Takegami, Takeo Ueno, Kazuyoshi Nomura, Akihiro Kajimoto
-
Publication number: 20030230105Abstract: Multi-type air conditioner including an outdoor unit installed outside of a room having a compressor and an outdoor unit mounted therein, a plurality of indoor units each installed in a room having an electronic expansion valve and an indoor heat exchanger, a distributor for separating refrigerant from the outdoor unit at a gas-liquid separator and guiding separated refrigerant to the plurality of indoor units selectively depending on operation conditions, a first connection pipe for guiding the refrigerant from the outdoor unit to the gas-liquid separator in the distributor, a second connection pipe for guiding the refrigerant from the distributor to the outdoor unit, and a switching part in the outdoor unit having a first four way valve provided to a discharge side of the compressor for selective switching of a flow direction of the refrigerant flowing in the outdoor heat exchanger, and a second four way valve provided to be switched in conformity with switching of the first four way valve for maintaining tType: ApplicationFiled: May 30, 2003Publication date: December 18, 2003Applicant: LG Electronics Inc.Inventor: Chang Seon Lee
-
Publication number: 20030230099Abstract: An air conditioning apparatus and control method thereof is provided, in which two-stage variable-capacity compressors are connected in parallel with each other to control capacities of the two stage variable-capacity compressors according to indoor air conditioning loads. A pair of two-stage variable-capacity compressors are used in the air conditioning apparatus to be cost competitive and can obtain an effect in which the pair of two-stage variable-capacity compressors are controlled as if a large-scale variable-capacity compressor with a capacity the same as a total capacity of the two compressors were linearly controlled.Type: ApplicationFiled: November 27, 2002Publication date: December 18, 2003Applicant: Samsung Electronics Co., Ltd.Inventors: Je-Myoung Moon, Jong-Youb Kim, Dong-Kue Lee, Il-Yong Cho
-
Publication number: 20030226370Abstract: A refrigeration system includes a chiller unit and a freezer unit. The freezer unit is provided with a freezing compressor for compressing a refrigerant in a total of two stages together with a compressor in an outdoor unit. The freezing compressor is formed by an inverter compressor. An oil separator is disposed on the discharge pipe of the freezing compressor. On the inlet pipe of the freezing compressor, a heat exchanger is provided for cooling an inverter with an refrigeration oil separated by the oil separator and a suction refrigerant.Type: ApplicationFiled: June 6, 2002Publication date: December 11, 2003Applicant: DAIKIN INDUSTRIES, LTD.Inventors: Kenji Tanimoto, Takeo Ueno, Masaaki Takegami, Kazuyoshi Nomura
-
Patent number: 6651458Abstract: An internal intermediate pressure type two-stage compression rotary compressor (10) is provided with an electrically driven element (14) disposed within a sealed vessel (12), and first and second rotary compression elements (32, 34) driven by the electrically driven element (14), and is structured such as to discharge CO2 refrigerant gas compressed at a first stage by the first rotary compression element (32) within the sealed vessel (12) and compress the discharged refrigerant gas having an intermediate pressure at a second stage by the second rotary compression element (34) via an accumulator (106). The rotary compression elements (32, 34) include upper and lower cylinders (38, 40), upper and lower rollers (46, 48) eccentrically rotating within the cylinder and upper and lower vanes (50, 52) brought into contact with the rollers so as to section the inner portions of the upper and lower cylinders into high pressure chambers and low pressure chambers.Type: GrantFiled: June 14, 2002Date of Patent: November 25, 2003Assignee: Sanyo Electric Co., Ltd.Inventors: Toshiyuki Ebara, Masaya Tadano, Takashi Yamakawa, Atsushi Oda
-
Patent number: 6637238Abstract: An apparatus for compressing gaseous refrigerant for use in a refrigeration circuit of a liquefaction plant, which refrigeration circuit has an inlet, a first outlet for refrigerant at low pressure, a second outlet for refrigerant at intermediate pressure, a third outlet for refrigerant at high pressure and a fourth outlet for refrigerant at high-pressure, which apparatus comprises a first and a second compressor, wherein the first compressor has a main inlet connected to the first outlet, a side-inlet connected to the third outlet and an outlet connected to the inlet of the refrigeration circuit, and wherein the second compressor has a main inlet connected to the second outlet, a side-inlet connected to the fourth outlet and an outlet connected to the inlet of the refrigeration circuit.Type: GrantFiled: June 11, 2002Date of Patent: October 28, 2003Assignee: Shell Research LimitedInventor: Hendrik Frans Grootjans
-
Patent number: 6631617Abstract: A two stage hermetic compressor which uses carbon dioxide as the working fluid. A pair of modules individually housing compression mechanisms are located at opposite ends of a module housing an electric motor. The modules are secured to one another when the compressor is assembled. Suction pressure carbon dioxide gas is compressed in the first compression mechanism to an intermediate pressure which is introduced into an electric motor module compartment. The intermediate pressure gas enters the second compression mechanism module through a suction port. A conical baffle is affixed to the upper compression mechanism module to protect the suction port from direct suction of oil and to separate oil entrained in the gas therefrom. The intermediate refrigerant gas is compressed to a discharge pressure and is discharged into a compartment defined in the second compression mechanism module. The discharge pressure gas is then exhausted to the refrigeration system.Type: GrantFiled: June 27, 2002Date of Patent: October 14, 2003Assignee: Tecumseh Products CompanyInventors: Nelik I. Dreiman, Rick L. Bunch
-
Publication number: 20030177782Abstract: The efficiency of a vapor compression system is increased by coupling the evaporator with either the intercooler of a two-stage vapor compression system or the compressor component. The refrigerant in the evaporator accepts heat from the compressor component or the refrigerant in the intercooler, heating the evaporator refrigerant. As pressure is directly related temperature, the low side pressure of the system increases, decreasing compressor work and increasing system efficiency. Additionally, as the heat from the compressor component or from the refrigerant in the intercooler is rejected to the refrigerant in the evaporator, the compressor is cooled, increasing the density and the mass flow rate of the refrigerant to further increase system efficiency.Type: ApplicationFiled: March 20, 2002Publication date: September 25, 2003Inventors: Sivakumar Gopalnarayanan, Tobias H. Sienel, Lili Zhang
-
Publication number: 20030167784Abstract: A compressor is used in an automotive air conditioner to compress a refrigerant gas. The compressor includes a first compression mechanism driven by an automobile engine and a second compression mechanism driven by an electric motor. The first and the second compression mechanisms are connected in series to each other with respect to a flow of the refrigerant gas. Preferably, the first compression mechanism is disposed on a downstream side of the second compression mechanism with respect to the flow of the refrigerant gas.Type: ApplicationFiled: February 28, 2003Publication date: September 11, 2003Inventor: Akiyoshi Higashiyama
-
Publication number: 20030126885Abstract: Refrigerant compressed by a first stage compression elements (30) run by a motor (20) is discharged in the closed container (10) via a silencer chamber (35) to cool the motor (20) before the refrigerant is led to a second stage compression element (40). The refrigerant is discharged from the second stage compression element (40) out of the compressor after it is further compressed in the second compression element (40). Thus, the motor (20) is cooled in a simple cooling mechanism during normal operation of the compressor.Type: ApplicationFiled: September 18, 2002Publication date: July 10, 2003Inventors: Toshiyuki Ebara, Satoshi Imai, Masaya Tadano, Atsushi Oda
-
Patent number: 6588221Abstract: A method of defrosting a refrigeration system having a main compressor connected by a main hot gas discharge line to a condenser, the condenser being connected by a main liquid line to thermal expansion valves and subsequent cooling coils, each thermal expansion valve and cooling coil being in parallel connection with the other thermal expansion valves and cooling coils, and each cooling coil being connected by a suction line to the main compressor, the defrosting method includes passing hot gas from the main hot gas discharge line through a selected cooling coil to defrost same, compressing cooled hot gas which has passed through the cooling coil by means of a separate dedicated defrost compressor, and returning the compressed hot gas to the main hot gas discharge line.Type: GrantFiled: October 23, 2002Date of Patent: July 8, 2003Assignee: Super S.E.E.R Systems Inc.Inventor: Charles Gregory
-
Patent number: 6584791Abstract: A pressure equalization method and system is provided for starting a compressor while maintaining the compressor at a high pressure and comprises a valve and a bleed port. The compressor has a compressor inlet for receiving a fluid at a first pressure and a compressor outlet for discharging the fluid at a second pressure, and is operable to compress the fluid from the first pressure to the second pressure. The valve is proximate to and in fluid communication with the compressor outlet and is movable to an open position when the compressor is operating to allow the fluid at the second pressure to flow through the valve and is movable to a closed position when the compressor stops operating to prevent backflow of the fluid at the second pressure through the valve toward the compressor inlet. The bleed port is upstream of the valve and in fluid communication with the compressor inlet to equalize the pressure of the fluid contained in the compressor when the compressor stops operating.Type: GrantFiled: April 5, 2001Date of Patent: July 1, 2003Assignee: Bristol Compressors, Inc.Inventors: David T. Monk, Larry G. Pippin, Pantelis V. Hatzikazakis, William Z. Sun, Timothy M. Wampler, Charles E. Zimmerman
-
Patent number: 6568198Abstract: A multi-stage compression refrigeration apparatus (10) includes a compressor having a first stage low-pressure compression means (32) and a second stage high-pressure compression means (34), a condenser (1), a first decompression means (3), an intercooler (6), a second decompression means (7), and an evaporator (8). The refrigerant discharged from the condenser (1) is diverted into first and second parts, with the first part passed to the intercooler (6) via the first decompression means (3) while the second part is passed to the evaporator (8) via the second decompressor (7). The refrigerant passed to the second decompressor (7) undergoes heat exchange with the intercooler (6). The refrigerant discharged from the evaporator (8) is fed to the low-pressure compression means (32). The refrigerant discharged from the intercooler (6) is fed to the high-pressure compression means (34) together with the refrigerant discharged from the low-pressure compression means.Type: GrantFiled: January 10, 2002Date of Patent: May 27, 2003Assignee: Sanyo Electric Co., Ltd.Inventors: Masaya Tadano, Atsushi Oda, Toshiyuki Ebara, Takashi Yamakawa
-
Patent number: 6568197Abstract: A refrigerating unit capable of optimum operation with respect to load by finely changing the operating capacity in response to changes in load, and offering energy saving effects. The refrigerating unit has a scroll type inverter-driven compressor and scroll type constant-speed compressors; a pressure sensor installed on the suction side; a circuit for starting the inverter-driven compressor first; and a circuit for deciding the driving frequency of the compressor and the number of constant-speed compressors to operate, based on a suction pressure value detected by the pressure sensor after the compressor was started.Type: GrantFiled: October 11, 2001Date of Patent: May 27, 2003Assignee: Hitachi, Ltd.Inventors: Masaki Uno, Naoki Hattori
-
Patent number: 6543243Abstract: An air conditioning system includes an engine driven compressor, and an independent electric motor driven compressor in a common housing. A controller adjusts the independent operation of the engine driven compressor and electric motor driven compressor in response to cooling demand input, and operational parameters of the engine and the battery, as well as optionally the electric motor driven compressor output and engine driven compressor output. A method of independently operating an engine driven compressor and electric motor driven compressor is also provided. The air-conditioning system, controller, and method are particularly useful in hybrid vehicles that use smaller displacement internal combustion engines and electric motor drive means.Type: GrantFiled: June 21, 2001Date of Patent: April 8, 2003Assignee: Visteon Global Technologies, Inc.Inventors: Robert John Mohrmann, Brian Robert Kelm, Rance Andrew Stehouwer
-
Publication number: 20030056534Abstract: A refrigerating device including a refrigerating cycle including a plurality of compressors driven by motors, the plurality of compressors comprising a variable speed compressor which can be controlled in capacity and a constant speed compressor which is driven by a motor of which rotor core comprising a cage type conductor and permanent magnets.Type: ApplicationFiled: October 24, 2002Publication date: March 27, 2003Inventors: Hiroaki Tsuboe, Susumu Nakayama, Akira Saruta, Kazumoto Urata
-
Publication number: 20030041605Abstract: A control box kit for twinning fan coils in a heat pump or AC installation includes electro-mechanical isolation relays and auxiliary limit switches. Existing fan coil transformers are disconnected to avoid component failure due to high voltage wiring variations. A single transformer is connected to operate both systems. Isolation relays for the reversing valves and supplemental electric heaters in a heat pump system allow both heat pumps to have independent defrost cycles. The accessory transformer and isolation relays are packaged and pre-wired in a control box for easy connection in the field.Type: ApplicationFiled: August 31, 2001Publication date: March 6, 2003Applicant: Carrier CorporationInventors: Ronald G. Butcher, Don A. Schuster
-
Patent number: 6516873Abstract: A heat exchanger for a multi-stage air compressor. The heat exchanger includes several cooling chambers. Each cooling chamber is configured to receive compressed air from one of the compressor stages. A cooling tube is positioned to carry cooling fluid through each of the cooling chamber sequentially. The cooling chambers are also positioned in series so that heated fluid leaving the outlet of a first cooling chamber enters the inlet of a second cooling chamber after passing through an additional compressor stage.Type: GrantFiled: August 25, 2000Date of Patent: February 11, 2003Assignee: Ingersoll-Rand CompanyInventor: Ronald L. Haugen
-
Patent number: 6484519Abstract: An air conditioner for motor vehicles has a refrigerant circuit in which the refrigerant is brought into a wet vapor state. The refrigerant circuit is comprised among other things of at least one compressor (37) and a pressure ramming machine (14′) which serves as an expansion device. By means of the pressure ramming machine (14′), energy is recovered during the expansion process which can be used in the circuit for compressing the refrigerant. In addition, a method for operating an air conditioner for motor vehicles is described, according to which a pressure ramming machine is integrated into the refrigerant circuit and refrigerant is brought into a wet vapor state in the pressure ramming machine (14′).Type: GrantFiled: August 8, 2001Date of Patent: November 26, 2002Assignee: Robert Bosch GmbHInventors: Ullrich Hesse, Thomas Tiedemann
-
Patent number: 6460371Abstract: A multistage compression refrigerating machine is disclosed, which efficiently cools a rotating machine such as an electric motor and lubricating oil by using a refrigerant and increases the amount of refrigerant to be used to provide the refrigerating capacity in the evaporator, thereby improving the refrigerating capacity. The machine comprises a condenser for supplying a condensed refrigerant to an evaporator via a subcooler: a multistage compression system for absorbing the above refrigerant, absorbing a refrigerant evaporated from the subcooler, from an intermediate position between adjacent compressors, compressing the absorbed refrigerants together, and discharging it to the condenser; a rotating-machine cooler for cooling a rotating machine for driving the multistage compression system; and a lubricating-oil cooler for cooling lubricating oil.Type: GrantFiled: July 16, 2001Date of Patent: October 8, 2002Assignee: Mitsubishi Heavy Industries, Ltd.Inventor: Akihiro Kawada
-
Patent number: 6460357Abstract: A refrigerator has a two-stage compressor and means for switching refrigerant flow between a primary channel and a bypassing channel at downstream of a condenser that is connected with an outlet of the two-stage compressor. The primary channel extends from a first exit of the means for switching, through a first capillary tube and a first evaporator, to a gas-liquid separator, a gas-exit of which is connected with a second evaporator through a second capillary tube. The bypassing channel extends from a second exit of the means for switching, through a bypass capillary, to the gas-liquid separator. When flow of refrigerant in the second evaporator is substantially interrupted and so detected, refrigerant flow is switched to the bypassing channel, by means for controlling.Type: GrantFiled: December 12, 2001Date of Patent: October 8, 2002Assignee: Kabushiki Kaisha ToshibaInventors: Takashi Doi, Tsutomu Sakuma, Koji Kashima, Akihiro Noguchi
-
Patent number: 6446462Abstract: It is desired to avoid lack of lubricant oil in any of a plurality of compressors disposed in parallel in a single refrigerant circuit. To achieve this result, a freezer unit is provided, wherein a first kind of oil return pipe leading to a refrigerant suction pipe of a first compressor from an oil separator installed in a discharged refrigerant junction pipe is installed, and a second kind of oil return pipe leading to a refrigerant suction pipe of a second compressor from the regular oil level height of the first compressor 1 is utilized.Type: GrantFiled: July 5, 2001Date of Patent: September 10, 2002Assignee: Sanyo Electric Co., Ltd.Inventors: Yasunori Kiyokawa, Yoshinori Noboru, Kazuyoshi Sugimoto, Takashi Sato, Jyunichi Suzuki, Kenji Aida
-
Publication number: 20020104326Abstract: A method and apparatus for refrigeration system control is provided. The refrigeration system includes a plurality of circuits with each circuit having at least one refrigeration case. An electronic evaporator pressure regulator is in communication with each circuit and is operable to control the temperature of the corresponding circuit. A plurality of compressors are also provided with each compressor forming a part of a compressor rack. A pressure sensor is used for measuring the suction pressure of the compressor rack. A sensor is in communication with each circuit and is operable to measure a parameter from each circuit. A controller controls each electronic evaporator pressure regulator and the suction pressure based upon the measured parameters from each circuit.Type: ApplicationFiled: February 1, 2002Publication date: August 8, 2002Inventors: Abtar Singh, Jim Chabucos, Paul Wickberg, John Wallace
-
Patent number: 6427460Abstract: A refrigeration system having a refrigeration cycle which provides optimized consumption, comprising a main section, which is constituted by at least one main compressor, a main condenser, which is connected between the compressor and at least one expansion valve, and at least one evaporator, which is connected to the expansion valve, which comprises an auxiliary section comprising at least one auxiliary compressor which is connected to a low-pressure intake line of the main compressor, at least one auxiliary condenser which is connected to the auxiliary compressor, and a first auxiliary reservoir and a second auxiliary reservoir which are respectively connected to the output of the auxiliary condenser and to the output of the main condenser, for connection to the at least one expansion valve.Type: GrantFiled: March 29, 2000Date of Patent: August 6, 2002Inventor: Luciano Zanon
-
Publication number: 20020092318Abstract: A multi-stage cooling system is disclosed. The multi-stage cooling system is capable of providing a plurality of cooling capacities. The cooling system has a plurality of independently operable compressors. A control system operates the compressors to provide a cooling capacity corresponding to the heat load of a space to be cooled. A condenser structure of the cooling system has a plurality of individual condenser coils. Each condenser coil has an independent refrigerant path receiving compressed refrigerant from one of the compressors. An evaporator structure of the cooling system has a plurality of individual evaporator coils. Each evaporator coil has an independent refrigerant path receiving condensed refrigerant from a corresponding condenser coil via an expansion mechanism and returning refrigerant to an input of a corresponding compressor.Type: ApplicationFiled: January 16, 2001Publication date: July 18, 2002Inventors: Russ Tipton, Terry Bush, Mike Graham, Jack Saunders
-
Patent number: 6408645Abstract: An air-conditioner, an outdoor unit and an refrigeration device each using a refrigeration cycle which can reduce power consumption so as to be highly efficient, which can be operated by a commercially available power source, and which is highly reliable. An air-conditioner comprises a motor and a refrigeration cycle including a compressor driven by the motor, an outdoor heat-exchanger and an indoor heat-exchanger, the motor being located in a motor chamber within a closed container, and refrigerant gas in the refrigeration cycle flows through the motor chamber, wherein the motor has a core of a rotor in which a cage type conductor and permanent magnets magnetized in bipolar state are embedded, and said motor is driven by a commercially available electric power source.Type: GrantFiled: August 10, 2001Date of Patent: June 25, 2002Assignee: Hitachi Air Conditioning Systems, Co. Ltd.Inventors: Hiroaki Tsuboe, Susumu Nakayama, Akira Saruta, Kazumoto Urata
-
Publication number: 20020073721Abstract: Disclosed herewith is an air conditioner with a pressure regulation device. The air conditioner controls the number of operated compressors according to load. The air conditioner includes a plurality of bypass conduits for guiding gaseous refrigerant from the outlet sides of compressors to the inlet sides of the compressors. A plurality of bypass valves are arranged on the bypass conduits for selectively opening and shutting the bypass conduits. A control unit controls the opening and closing of the bypass valves so as to control pressure in the inlet sides of one or more started compressors during the starting of the compressors. In addition, a method for controlling the air conditioner is disclosed.Type: ApplicationFiled: March 26, 2001Publication date: June 20, 2002Inventors: Hyeong-Joon Seo, Jong-Moon Kim
-
Patent number: 6401485Abstract: A refrigerant system includes two compressors that are independently activated to meet a variable cooling demand of a comfort zone or a process. For high cooling demands, both compressors are operated. However, for lower cooling demands, one compressor is de-activated, while the other continues running. To help prevent refrigerant from condensing in the vicinity of the relatively cool inactive compressor, heat from the discharge line of the running compressor heats the suction or discharge line of the inactive compressor. To transfer heat from one line to the other, the two lines are simply held against each other in a parallel, side-by-side relationship.Type: GrantFiled: October 6, 2000Date of Patent: June 11, 2002Assignee: American Standard Inc.Inventor: Edward D. Hildreth, Jr.
-
Patent number: 6397621Abstract: The refrigeration cycle uses an evaporation zone prior to compression and a condensation zone after the latter, in which the thermodynamic fluid used in the cycle as well as the fluid used in the cold-exchange and heat-exchange cycles is water. The installation is operated on the basis of dynamic compression in two separate compression stages linked to one another by at least one zone with de-superheating and enclosed in a hermetically sealed and heat-insulated enclosure confining the vapor at very low pressure; the wheels of these two stages are mounted directly on the opposite ends of the shaft of a common, sealed, variable speed electric motor disposed inside the enclosure between these stages.Type: GrantFiled: October 19, 2000Date of Patent: June 4, 2002Assignee: Electricite de France Service NationalInventors: Jean-François Reynaud, Guy Chambaron, Henri Rodie-Talbere
-
Patent number: 6381972Abstract: The invention is embodied in a refrigeration unit (R) adapted for use in combination with plural associated refrigerated fixtures (33a, 33b, 33c) in a commercial store, each fixture having a product zone and heat transfer cooling means (29) for the refrigeration thereof and which refrigeration unit comprises housing means (55, 57) with a mounting profile constructed to be accommodated substantially within the footprint area of one of said associated fixtures and arranged to support selective refrigeration components of a closed refrigeration circuit for supplying the refrigeration requirements of all associated fixtures, and which components include plural vapor phase compressor means (21) and a closely coupled coolant loop connected with the heat transfer cooling means.Type: GrantFiled: June 19, 2001Date of Patent: May 7, 2002Assignee: Hussmann CorporationInventor: Dennis Cotter
-
Publication number: 20020050149Abstract: A multistage compression refrigerating machine is disclosed, which efficiently cools a rotating machine such as an electric motor and lubricating oil by using a refrigerant and increases the amount of refrigerant to be used to provide the refrigerating capacity in the evaporator, thereby improving the refrigerating capacity. The machine comprises a condenser for supplying a condensed refrigerant to an evaporator via an intercooler: a multistage compression system for absorbing the above refrigerant, absorbing a refrigerant evaporated from the intercooler, from an intermediate position between adjacent compressors, compressing the absorbed refrigerants together, and discharging it to the condenser; a rotating-machine cooler for cooling a rotating machine for driving the multistage compression system; and a lubricating-oil cooler for cooling lubricating oil.Type: ApplicationFiled: July 16, 2001Publication date: May 2, 2002Applicant: MITSUBISHI HEAVY INDUSTRIES, LTD.Inventor: Akihiro Kawada
-
Publication number: 20020035850Abstract: The object of this invention is to provide a cooling apparatus with low compression load. This cooling apparatus consists of an expansion unit for adiabatically expanding refrigerant, an indoor unit having a heat exchanger, a compressor for adiabatically compressing the refrigerant, and an outdoor unit having a heat exchanger, and sequentially circulates refrigerant through the compressor, outdoor unit, expansion unit, and indoor unit to cool a target area using the phase change of the refrigerant. In an embodiment, the apparatus (100) is designed such that the refrigerant from the outdoor unit (160) passes through a heat exchanging and evaporating unit (110) prior to flowing into the expansion unit (120), with the refrigerant from the evaporating unit (110) partially flowing into a sub-expansion unit (130) to become low temperature, low pressure bypassed refrigerant.Type: ApplicationFiled: June 6, 2001Publication date: March 28, 2002Applicant: BOILCON CO., LTD.Inventors: Young Ho Kim, Shin Hee Ryu
-
Publication number: 20020026806Abstract: An air-conditioner, an outdoor unit and an refrigeration device each using a refrigeration cycle which can reduce power consumption so as to be highly efficient, which can be operated by a commercially available power source, and which is highly reliable. An air-conditioner comprises a motor and a refrigeration cycle including a compressor driven by the motor, an outdoor heat-exchanger and an indoor heat-exchanger, the motor being located in a motor chamber within a closed container, and refrigerant gas in the refrigeration cycle flows through the motor chamber, wherein the motor has a core of a rotor in which a cage type conductor and permanent magnets magnetized in bipolar state are embedded, and said motor is driven by a commercially available electric power source.Type: ApplicationFiled: August 10, 2001Publication date: March 7, 2002Inventors: Hiroaki Tsuboe, Susumu Nakayama, Akira Saruta, Kazumoto Urata
-
Publication number: 20020023459Abstract: It is an object of the invention to avoid lack of lubricant oil in any of a plurality of compressors disposed in parallel in a single refrigerant circuit. A freezer unit, wherein a first kind oil return pipe 18 leading to a refrigerant suction pipe 4 of a first compressor 1 from an oil separator installed in a discharged refrigerant junction pipe 8 is installed, and a second kind oil return pipe 12 leading to a refrigerant suction pipe 5 of a second compressor 2 from the regular oil level height of the first compressor 1.Type: ApplicationFiled: July 5, 2001Publication date: February 28, 2002Inventors: Yasunori Kiyokawa, Yoshinori Noboru, Kazuyoshi Sugimoto, Takashi Sato, Jyunichi Suzuki, Kenji Aida
-
Patent number: 6349564Abstract: The improved refrigeration system of the present invention includes an accumulator with a diffuser pipe extending downwardly into the upper end of a vapor refrigerant tank, the diffuser pipe extending from an evaporator and discharging vapor refrigerant therefrom into the tank. The diffuser pipe includes a lower end located within the interior of the tank which is expanded in diameter relative to the upper end, thereby reducing the velocity of fluid flowing through the pipe and entering the accumulator tank. A diffusion plate is mounted in the lower end of the diffuser pipe, to further diffuse fluid flowing therethrough. The improved refrigeration system also includes a tee having a stem portion extending horizontally from the condenser of the system, and a pair of upper and lower arms connected in a vertical orientation to the stem. The tee lower arm is connected to the receiver and the upper arm is connected to a purge connection.Type: GrantFiled: September 12, 2000Date of Patent: February 26, 2002Inventors: Fredric J. Lingelbach, John F. Lingelbach
-
Patent number: 6330804Abstract: A refrigerating unit capable of optimum operation with respect to load by finely changing the operating capacity in response to changes in load, and offering energy saving effects. The refrigerating unit has a scroll type inverter-driven compressor and scroll type constant-speed compressors; a pressure sensor installed on the suction side; a circuit for starting the inverter-driven compressor first; and a circuit for deciding the driving frequency of the compressor and the number of constant-speed compressors to operate, based on a suction pressure value detected by the pressure sensor after the compressor was started.Type: GrantFiled: February 23, 2000Date of Patent: December 18, 2001Assignee: Hitachi, Ltd.Inventors: Masaki Uno, Naoki Hattori
-
Publication number: 20010045104Abstract: Ergonomic systems which provide medical therapy, comfort and enhanced function are provided. Surfaces are provided with adjustable contour, transient force damping and temperature. The technologies are applied to footwear, seating surfaces an cryotherapy devices. The cooling and cryotherapy system employ an evaporator in close proximity to skin, and therefore employ methods to reduce risk of frostbite. Advanced control and power supply options are disclosed.Type: ApplicationFiled: May 10, 2001Publication date: November 29, 2001Inventors: Richard F. Bailey, Ronald A. Fisher, Steven M. Hoffberg
-
Patent number: 6321564Abstract: In a refrigerant cycle system, refrigerant compressed in a first compressor is cooled and condensed in a radiator, and refrigerant from the radiator branches into main-flow refrigerant and supplementary-flow refrigerant. The main-flow refrigerant is decompressed in an expansion unit while expansion energy of the main-flow refrigerant is converted to mechanical energy. Thus, the enthalpy of the main-flow refrigerant is reduced along an isentropic curve. Therefore, even when the pressure within the evaporator increases, refrigerating effect is prevented from being greatly reduced in the refrigerant cycle system. Further, refrigerant flowing into the radiator is compressed using the converted mechanical energy. Thus, coefficient of performance of the refrigerant cycle system is improved.Type: GrantFiled: March 13, 2000Date of Patent: November 27, 2001Assignees: Denso Corporation, Nippon Soken, Inc.Inventors: Yasushi Yamanaka, Yasutaka Kuroda, Shin Nishida, Motohiro Yamaguchi, Yukikatsu Ozaki, Tadashi Hotta, Sadahisa Onimaru, Mitsuo Inagaki
-
Patent number: 6305187Abstract: An air-conditioner, an outdoor unit and an refrigeration device each using a refrigeration cycle which can reduce power consumption so as to be highly efficient, which can be operated by a commercially available power source, and which is highly reliable. An air-conditioner comprises a motor and a refrigeration cycle including a compressor driven by the motor, an outdoor heat-exchanger and an indoor heat-exchanger, the motor being located in a motor chamber within a closed container, and refrigerant gas in the refrigeration cycle flows through the motor chamber, wherein the motor has a core of a rotor in which a cage type conductor and permanent magnets magnetized in bipolar state are embedded, and said motor is driven by a commercially available electric power source.Type: GrantFiled: April 19, 2000Date of Patent: October 23, 2001Inventors: Hiroaki Tsuboe, Susumu Nakayama, Akira Saruta, Kazumoto Urata
-
Patent number: 6189335Abstract: There is disclosed a multi-stage compressing refrigeration device for multi-stage compressing a refrigerant using a plurality of compressing means. Its object is to enhance reliability, intend to reduce input and improve refrigeration effect, and to enhance efficiency. In the multi-stage compressing refrigeration device, low-stage compressing means and high-stage compressing means, a condenser, first expanding means, an intermediate evaporator, second expanding means and a main evaporator constitute a refrigeration cycle. The refrigerant flowing out of the condenser is branched into one refrigerant passed to the intermediate evaporator via the first expanding means and the other refrigerant passed to the main evaporator via the second expanding means. Heat exchange is performed between the refrigerant flowing into the second expanding means and the intermediate evaporator.Type: GrantFiled: January 22, 1999Date of Patent: February 20, 2001Assignee: Sanyo Electric Co., Ltd.Inventors: Toshiyuki Ebara, Yoshio Ishiai, Takeo Komatsubara, Masaya Tadano