Of Expansion Valve Or Variable Restrictor Patents (Class 62/222)
  • Patent number: 10813243
    Abstract: It is impossible to avoid the increase in device cost and maintenance cost in order to cool a plurality of heat sources efficiently using a natural-circulation type phase-change cooling device; therefore, a phase-change cooling device according to an exemplary aspect of the present invention includes a plurality of heat receiving units configured to hold respectively refrigerant receiving heat from a plurality of heat sources; a condensing unit configured to generate refrigerant liquid by condensing and liquefying refrigerant vapor of the refrigerant evaporated in the heat receiving units; a refrigerant vapor transport structure connecting the heat receiving units to the condensing unit and configured to transport the refrigerant vapor; and a refrigerant liquid transport structure connecting the heat receiving units to the condensing unit and configured to transport the refrigerant liquid, wherein the refrigerant liquid transport structure includes a main-liquid-pipe connected to the condensing unit, a refrig
    Type: Grant
    Filed: August 20, 2015
    Date of Patent: October 20, 2020
    Assignee: NEC Corporation
    Inventors: Akira Shoujiguchi, Minoru Yoshikawa, Masaki Chiba, Arihiro Matsunaga, Masanori Sato
  • Patent number: 10774942
    Abstract: [Object] An electric valve control device capable of preventing a start delay of an electric valve control (an opening degree control) by shortening a waiting period of a system control device and an electric valve device including the same are provided. [Solving Means] An electric valve control device 11 outputs a signal indicating an end or an interruption of an initialization operation to an air conditioner ECU 16 after the initialization operation of the electric valve 9 ends or is interrupted.
    Type: Grant
    Filed: September 21, 2017
    Date of Patent: September 15, 2020
    Assignee: FUJIKOKI CORPORATION
    Inventors: Yoshio Ogawa, Kiyoharu Satou, Akihiro Hayashi
  • Patent number: 10767907
    Abstract: A decentralized condenser evaporator system includes a condenser system, a controlled pressure receiver, a subcooler system, and an evaporator system. The condenser system is positioned to receive a compressed gaseous refrigerant from a centralized compressor system. The condenser system is configured to condense the compressed gaseous refrigerant into a liquid refrigerant. The controlled pressure receiver is positioned to receive and store the liquid refrigerant. The subcooler system is positioned to receive the liquid refrigerant from the controlled pressure receiver. The subcooler system is configured to sub-cool the liquid refrigerant into a sub-cooled liquid refrigerant. The evaporator system is positioned to receive the sub-cooled liquid refrigerant from the subcooler system.
    Type: Grant
    Filed: April 13, 2017
    Date of Patent: September 8, 2020
    Assignee: Johnson Controls Technology Company
    Inventors: Thomas P. Carter, Bruce L. Griffith
  • Patent number: 10677502
    Abstract: According to one embodiment, a heat transport apparatus includes an evaporator, a cooling unit, a channel structure, and a heating mechanism. The evaporator vaporizes a refrigerant by heat generated by a heat-generating element. The cooling unit is provided above the evaporator and cools and condenses the refrigerant vaporized in the evaporator. The channel structure constitutes a channel through which the refrigerant circulates between the evaporator and the cooling unit. The heating mechanism heats the cooling unit and suppresses solidification of the refrigerant at the cooling unit.
    Type: Grant
    Filed: February 12, 2018
    Date of Patent: June 9, 2020
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Takuya Hongo, Rei Kimura, Tomonao Takamatsu, Chikako Iwaki, Hideki Horie
  • Patent number: 10617832
    Abstract: An adapter for delivering an atomized spray from a syringe. The adapter includes an adapter guide including a side wall, an interior surface of the side wall defining a through-bore and a shoulder in the through-bore. A pin guide is located in the through-bore. The pin guide includes a seat and a sleeve extending from the seat. A spring positioned around the pin guide sleeve and between the pin guide seat and the shoulder, wherein the spring and the sleeve provide a passageway there between. A pin extends from the pin guide seat and through the passageway. Affixing the adapter onto a syringe provides an atomizing delivery device. A method of dispensing an atomized spray from a syringe is provided by affixing the adapter to the syringe.
    Type: Grant
    Filed: November 22, 2017
    Date of Patent: April 14, 2020
    Assignee: Southwest Research Institute
    Inventors: Barrett Wade Mangold, Terrence Francis Alger, II, Albert M. Zwiener
  • Patent number: 10603669
    Abstract: An agitator ball mill with a fluid circuit, which includes a grinding container and a casing container disposed around the latter uniformly spaced apart axially with a cavity formed between the containers. The fluid circuit is led at at least one flange through at least one flange lead-through introduced there, wherein a first opening of the at least one flange lead-through is constituted in a side wall of the corresponding flange lying orthogonal to the outer surface of the casing container.
    Type: Grant
    Filed: February 24, 2016
    Date of Patent: March 31, 2020
    Assignee: NETZSCH-Feinmahltechnik GmbH
    Inventors: Philipp Rath, Lars-Peter Weiland
  • Patent number: 10598414
    Abstract: A method for controlling a variable capacity ejector unit (7) arranged in a refrigeration system (1) is disclosed. An ejector control signal for the ejector unit (7) is generated, based on an obtained temperature and an obtained pressure of refrigerant leaving a heat rejecting heat exchanger (3), or on the basis of a high pressure valve control signal for controlling an opening degree of a high pressure valve (6) arranged fluidly in parallel with the ejector unit (7). The ejector control signal indicates whether the capacity of the ejector unit (7) should be increased, decreased or maintained. The capacity of the ejector unit (7) is controlled in accordance with the generated ejector control signal. The power consumption of the refrigeration system (1) is reduced, while the pressure of the refrigerant leaving the heat rejecting heat exchanger (3) is maintained at an acceptable level.
    Type: Grant
    Filed: June 23, 2015
    Date of Patent: March 24, 2020
    Assignee: DANFOSS A/S
    Inventors: Kenneth Bank Madsen, Jan Prins, Kristian Fredslund
  • Patent number: 10527330
    Abstract: In a refrigeration cycle device, a compressor, a heat exchanger serving as a condenser, an expansion valve, and a heat exchanger serving as an evaporator are connected in order through refrigerant piping to form a refrigeration cycle. The refrigeration cycle device includes an evaporation temperature sensor provided between the expansion valve and the exchanger serving as the evaporator. The opening degree of the expansion valve is controlled such that an evaporation temperature detected by the evaporation temperature sensor reaches a control target value of the evaporation value. As a result, the refrigeration cycle device capable of achieving enhanced controllability while preventing liquid back to the compressor is provided.
    Type: Grant
    Filed: April 13, 2016
    Date of Patent: January 7, 2020
    Assignee: Hitachi, Ltd.
    Inventors: Sachio Sekiya, Masanao Kotani
  • Patent number: 10465964
    Abstract: A refrigeration cycle apparatus includes a discharge temperature sensor that detects a discharge temperature of refrigerant discharged from a compressor, and a controller that controls the opening degree of an expansion valve. The controller computes an amount of variation of the discharge temperature resulting from varying the opening degree of the expansion valve, computes a ratio of the amount of variation of the discharge temperature to an amount of variation of the opening degree of the expansion valve, and determines the opening degree to be set to the expansion valve on the basis of the opening degree of the expansion valve that causes a change of the ratio.
    Type: Grant
    Filed: December 26, 2012
    Date of Patent: November 5, 2019
    Assignee: Mitsubishi Electric Corporation
    Inventors: Yohei Kato, Kiyoshi Yoshimura
  • Patent number: 10422562
    Abstract: An apparatus includes a first compressor, a first load, a second compressor, a second load, and a heat exchanger. The first compressor compresses a first refrigerant. The first load uses the first refrigerant to remove heat from a space proximate the first load. The first load sends the first refrigerant to the first compressor. The second compressor compresses a second refrigerant. The second load uses the second refrigerant to remove heat from a space proximate the second load. The second load sends the second refrigerant to the second compressor. The heat exchanger receives the first refrigerant from the first compressor and receives the second refrigerant from the second compressor. The heat exchanger transfers heat from the first refrigerant to the second refrigerant. The heat exchanger discharges the first refrigerant to the first load and discharges the second refrigerant to the second compressor.
    Type: Grant
    Filed: February 14, 2017
    Date of Patent: September 24, 2019
    Assignee: Heatcraft Refrigeration Products LLC
    Inventors: Augusto J. Pereira Zimmermann, Robert H. Austin, Jr.
  • Patent number: 10345022
    Abstract: An air-conditioning apparatus is configured to melt a large amount of adhering frost while maintaining an appropriate operation of a compressor by setting a defrosting operation time period depending on a low pressure of the compressor. The air-conditioning apparatus includes a refrigerant circuit including the compressor, a refrigerant flow switching device, a heat source-side heat exchanger, an expansion device, and a use-side heat exchanger, which are connected via a refrigerant pipe to form a refrigeration cycle, a pressure sensor configured to detect a pressure on a suction side of the compressor, and a controller configured to control, in a defrosting operation, the refrigerant flow switching device to supply compressed refrigerant from the compressor to the heat source-side heat exchanger, compare a value detected by the pressure sensor with a first threshold value, and change the defrosting operation time period based on a result of the comparison.
    Type: Grant
    Filed: August 14, 2015
    Date of Patent: July 9, 2019
    Assignee: Mitsubishi Electric Corporation
    Inventor: Kohei Najima
  • Patent number: 10337803
    Abstract: A circuit includes an evaporator receiving heat from a hot body; a condenser transmits heat to a cold body, a working fluid flows through a first conduit in vapour phase from the evaporator to the condenser, and flows through a second conduit in liquid phase, from the condenser to the evaporator. A first evaporator portion is in fluid communication with the second conduit and acts as a compensation chamber. A second evaporator portion is in fluid communication with the first conduit and contains the vapour phase. A porous wick moves the working fluid from the first evaporator portion to the second evaporator portion. A first flow controller interrupts or allows flow when fluid temperature in the elevator is respectively lower or higher than a first threshold. A second flow controller interrupts or allows flow when the temperature in the condenser is respectively higher or lower than a second threshold.
    Type: Grant
    Filed: October 28, 2014
    Date of Patent: July 2, 2019
    Assignee: ALENIA AERMACCHI S.p.A.
    Inventor: Antonio Moscatelli
  • Patent number: 10071019
    Abstract: The invention relates to a portable apparatus for regulating the temperature of medicaments in solid or liquid form. A temperature-regulating apparatus according to the invention comprises a housing with at least one accommodating chamber, with at least one temperature-regulating device for regulating the temperature of the accommodating chamber, in particular a thermoelectric temperature-regulating device, with at least one inputting means capable of registering an insertion of a medicament container into the accommodating chamber or an immediately imminent insertion, and of controlling the temperature-regulation of the accommodating chamber depending thereon.
    Type: Grant
    Filed: July 26, 2012
    Date of Patent: September 11, 2018
    Inventor: Peter Lüpges
  • Patent number: 10000109
    Abstract: Air conditioning systems and methods for a vehicle having a start-stop engine system. The systems and methods cool the vehicle's passenger cabin when the vehicle's engine and air conditioning compressor are off.
    Type: Grant
    Filed: June 24, 2016
    Date of Patent: June 19, 2018
    Assignee: DENSO International America, Inc.
    Inventor: Adam Gilley
  • Patent number: 9976782
    Abstract: Standalone and self-contained cooling systems using compressed liquid and/or gas C02 containers positioned in an insulated or non-insulated vessel and consisting of a specially designed unit where the containers are vertically positioned in an upright or upside-down position. The liquid and/or gas CO2 coolant is then released into capillary tube(s) embedded into a heat transfer plate or heat exchanger thus leveraging the C02 coolant properties. The temperature is controlled by a metering C02 releasing system encompassing an electronic control device which can be operated remotely and/or via a touch screen and which sends alerts when pre-defined thresholds are exceeded. The invention's metering C02 releasing system may be triggered by an electronic or a thermostatic valve or may be triggered manually or by an electronic solenoid. The invention's cooling system also encompasses check valves, which avoid liquid and/or gas C02 from escaping when removing or replacing C02 containers individually.
    Type: Grant
    Filed: December 18, 2016
    Date of Patent: May 22, 2018
    Assignees: Frostime LLC, NDSU Research Foundation
    Inventors: Mark Holzwanger, Xianghong Henry Liu, Heng Hu, Harry Holzwanger, Maria Grazia Verardi, Robert A. Sailer, Justin Hoey
  • Patent number: 9874383
    Abstract: An air conditioner is provided. The air conditioner includes a compressor for compressing a refrigerant, an oil separator for separating an oil of the refrigerant discharged from the compressor to collect the separated oil into the compressor, a condenser for condensing the refrigerant separated from the oil separator, and a supercooling part in which a main refrigerant that is the refrigerant condensed by the condenser is heat-exchanged with a branch refrigerant branched from the main refrigerant. At least a portion of the oil collected into the compressor passes through the supercooling part.
    Type: Grant
    Filed: July 2, 2015
    Date of Patent: January 23, 2018
    Assignee: LG ELECTRONICS INC.
    Inventors: Jaehwa Jung, Chiwoo Song
  • Patent number: 9855821
    Abstract: A heat pump system for a vehicle having a complex valve device including a three-way valve, an on-off valve, expansion means and connection blocks are formed integrally with one another, the three-way valve part being connected to the refrigerant circulation line of an inlet of the exterior heat exchanger such that the refrigerant selectively bypasses the exterior heat exchanger, the on-off valve part being connected to an inlet of the bypass line to open and close the bypass line. Connection blocks connect the three-way valve part and the on-off valve part with the refrigerant circulation line of an outlet of the exterior heat exchanger to communicate with each other. Expansion means are connected to an inlet of the three-way valve part to selectively expand refrigerant discharged from an interior heat exchanger. All functions of the heat pump system are thus conducted through a refrigerant control of the complex valve device.
    Type: Grant
    Filed: August 16, 2013
    Date of Patent: January 2, 2018
    Assignee: HANON SYSTEMS
    Inventors: Sungho Kang, Hakkyu Kim, Sangki Lee, Youngho Choi, Jungjae Lee
  • Patent number: 9845987
    Abstract: The present invention relates to a cooling device (1) comprising more than one cabinet (2, 102, 202) wherein items to be cooled are placed and which are positioned separately, a compressor (5) providing the cooling cycle to be performed, and more than one valve (6, 106, 206) providing the refrigerant pumped from the compressor (5) to be determined, to which cabinet (2, 102, 202) and in which amount it will be directed.
    Type: Grant
    Filed: September 8, 2009
    Date of Patent: December 19, 2017
    Assignee: ARCELIK ANONIM SIRKETI
    Inventors: Mehmet Oturak, Emre Arisoy, Veysi Ercan, Ilkin Tacan, Alper Mirza
  • Patent number: 9816639
    Abstract: A drive control device performs a mode change with a constant current between a first mode in which an opening degree of a refrigerant passage is changed in a first flow region where a flow rate of refrigerant flowing through the refrigerant passage is lower than or equal to a predetermined value and a second mode in which the opening degree of the refrigerant passage is changed in a second flow region where the flow rate of refrigerant flowing through the refrigerant passage is higher than the predetermined value. The drive control device increases a value of the constant current at the mode change to be larger than a value of a constant current when the opening degree of the refrigerant passage is changed in the first mode.
    Type: Grant
    Filed: August 9, 2012
    Date of Patent: November 14, 2017
    Assignee: DENSO CORPORATION
    Inventors: Yuuya Suzuki, Tatsuhiro Matsuki, Kazuaki Takemoto
  • Patent number: 9732992
    Abstract: An air-conditioning apparatus that can prevent freezing of a heat transfer medium even when using a non-azeotropic refrigerant mixture. The air-conditioning apparatus is designed such that when a heat exchanger serves as a cooler that cools a heat transfer medium, it controls a heat medium passage reversing device. This is so that, when a heat transfer medium flowing through a heat medium flow passage will not be frozen, a refrigerant flowing through a refrigerant flow passage and the heat transfer medium flowing through the heat medium flow passage are in counter flow. It is also to control the heat medium passage reversing device so that, when there is a possibility of freezing the heat transfer medium flowing through the heat medium flow passage, the refrigerant flowing through the refrigerant flow passage and the heat transfer medium flowing through the heat medium flow passage are in parallel flow.
    Type: Grant
    Filed: January 27, 2011
    Date of Patent: August 15, 2017
    Assignee: Mitsubishi Electric Corporation
    Inventor: Koji Yamashita
  • Patent number: 9733009
    Abstract: A refrigerant is provided that may include at least one compressor that compresses a refrigerant, a condenser that condenses the refrigerant compressed in the at least one compressor, a first expansion device that decompresses the refrigerant condensed in the condenser, a gas/liquid separator that separates the refrigerant decompressed in the first expansion device into a liquid refrigerant and a gaseous refrigerant, first and second evaporators, to which the liquid refrigerant separated in the gas/liquid separator may be introduced, and a second expansion device disposed at an inlet-side of the second evaporator to decompress the refrigerant.
    Type: Grant
    Filed: November 3, 2014
    Date of Patent: August 15, 2017
    Assignee: LG ELECTRONICS INC.
    Inventors: Sangbong Lee, Jangseok Lee, Hyoungkeun Lim, Myungjin Chung, Minkyu Oh
  • Patent number: 9714786
    Abstract: A cooling system is disclosed. The cooling system may have an evaporator, an evaporator fan, a condenser, and at least one compressor. The compressor may be either a single speed or a variable speed compressor. In addition, the system can use a mechanical or electrical pulsed operation refrigerant flow control valve for controlling refrigerant flow to the evaporator.
    Type: Grant
    Filed: September 11, 2015
    Date of Patent: July 25, 2017
    Assignee: Rocky Research
    Inventors: Uwe Rockenfeller, Kaveh Khalili
  • Patent number: 9347567
    Abstract: A valve apparatus for the vehicle that may be disposed in a vehicle to exhaust operating fluid, which flows therein, to the outside, may include a main body that has at least one exhaust port and input port and the operating fluid flows there in through the input port, and an opening/closing unit that may be disposed in the main body, wherein the opening/closing unit selectively fluid-connects one of the at least a exhaust port with the input port according to a temperature of the operating fluid such that the inflow operating fluid may be exhausted to the outside through the exhaust port.
    Type: Grant
    Filed: December 8, 2011
    Date of Patent: May 24, 2016
    Assignee: HYUNDAI MOTOR COMPANY
    Inventors: Jae Yeon Kim, Wan Je Cho
  • Patent number: 9328931
    Abstract: A heating and/or cooling system for maintaining an environment at a desired temperature. The heating and/or cooling system includes a heat pump, a temperature sensor disposed to measure a temperature of the environment, and a system controller. The system controller may be configured to control a condensing temperature within the condenser such that the condensing temperature is set as low as possible while maintaining the condensing temperature a predetermined amount above the desired temperature that is being maintained. The system controller may also be configured to control the evaporating valve in order to vary, based on the measured temperature, an evaporating temperature in order to reduce the difference between the evaporating and condensing temperatures.
    Type: Grant
    Filed: February 9, 2012
    Date of Patent: May 3, 2016
    Assignee: ESG POOL VENTILATION LTD
    Inventor: Anthony Robinson
  • Patent number: 9261300
    Abstract: A method of controlling an HVAC system electronic expansion valve (EEV) includes determining an optimal EEV position for the HVAC system as a function of a variable related to an ambient environment enthalpy and operating the HVAC system as a function of the optimal EEV position.
    Type: Grant
    Filed: November 12, 2012
    Date of Patent: February 16, 2016
    Assignee: Trane International Inc.
    Inventors: Hunter Ian Golden, Jason Thomas LeRoy, Raymond Walter Rite
  • Publication number: 20150135752
    Abstract: A refrigerating apparatus includes a high-temperature side circuit and a low-temperature side circuit connected to each other via a cascade condenser, a low-temperature side second flow control valve that turns a refrigerant, passing through a liquid pipe connecting between a cooling unit and other circuit parts in a low-temperature side circuit b, into a gas-liquid two-phase refrigerant, and an expansion tank connected to the suction side of a low-temperature circuit compressor via a tank electromagnetic valve.
    Type: Application
    Filed: August 20, 2012
    Publication date: May 21, 2015
    Applicant: Mitsubishi Electric Corporation
    Inventors: Takeshi Sugimoto, So Nomoto, Tomotaka Ishikawa, Takashi Ikeda
  • Patent number: 9032749
    Abstract: This invention relates to a multi-room air conditioning system with a plurality of indoor expansion valves. A method for sequencing the initialization of each indoor expansion valve upon system startup is disclosed. The method includes the following steps: 1. Initializing expansion valves corresponding to active indoor units, 2. Turning on the compressor, 3. Adjusting the indoor expansion valves corresponding to active indoor units, 4. Initializing and adjusting indoor expansion valves corresponding to inactive indoor units.
    Type: Grant
    Filed: March 17, 2011
    Date of Patent: May 19, 2015
    Assignee: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Kazunori Korenaga, Takeshi Kuramochi, Yoshio Yajima
  • Publication number: 20150128630
    Abstract: An evaporator set, preferably for a thermally driven adsorption device. In an evaporator set that can be connected an easily output-scalable modular thermally driven condenser set and, as a result, can be used simultaneously as a heat or cold store, a liquid collector is connected via a blockable expansion valve with an evaporator for cooling a fluid, wherein the liquid collector, the expansion valve and the evaporator form a structural unit, and wherein the liquid collector has a fluid inlet for and the evaporator a fluid outlet to a thermally driven condenser set.
    Type: Application
    Filed: November 12, 2014
    Publication date: May 14, 2015
    Inventor: Roland BURK
  • Patent number: 9021823
    Abstract: A system, compressor, and method that cools an electronics module with a low-pressure refrigerant. The system, compressor, and method utilize a temperature sensor that detects a temperature of the low pressure refrigerant and communicates with the electronics module. Based on the temperature detected by the temperature sensor, the electronics module controls a liquid dry out point of the refrigerant that is used to cool the electronics module.
    Type: Grant
    Filed: September 8, 2014
    Date of Patent: May 5, 2015
    Assignee: Emerson Climate Technologies, Inc.
    Inventor: Jean-Luc M. Caillat
  • Publication number: 20150114017
    Abstract: The disclosed refrigeration-cycle equipment comprises a main circuit and an evaporation-side circulation circuit. The main circuit includes i) a compressor that compresses refrigerant vapor, ii) a condensation mechanism that condenses the refrigerant vapor, and iii) an evaporative mechanism that stores refrigerant liquid and that evaporates the refrigerant liquid. The evaporation-side circulation circuit includes a heat exchanger for heat absorption and a decompression mechanism. The refrigerant returns to the evaporative mechanism after the refrigerant absorbing heat in the heat exchanger for heat absorption and the pressure of the refrigerant being reduced in the decompression mechanism. The refrigeration-cycle equipment further has an interaction mechanism that prevents droplets contained in the refrigerant having returned from the evaporation-side circulation circuit to the evaporative mechanism from being fed into the compressor.
    Type: Application
    Filed: October 23, 2014
    Publication date: April 30, 2015
    Inventors: YOSHIMI HAYASHI, TOMOICHIRO TAMURA, MAMORU NISHIBU, TAKAHIRO MATSUURA, BUNKI KAWANO, IORI MARUHASHI
  • Publication number: 20150107286
    Abstract: The present invention provides a heat pump that includes: a compressor, a switching valve, an indoor heat exchanger, a first expansion valve, and an outdoor heat exchanger, wherein the outdoor heat exchanger includes: a primary heat exchanging unit connected with the first expansion valve through a refrigerant pipe and through which outdoor air exchanges heat; a secondary heat exchanging unit connected with the switching valve through a refrigerant pipe, disposed behind the primary heat exchanging unit in the flow direction of outdoor air, and through which the outdoor air, which has exchanged heat through the primary heat exchanging unit, exchanges heat; a connection pipe that connects the primary heat exchanging unit and the secondary heat exchanging unit with each other; and a second expansion valve that is disposed in the connection pipe. Therefore, it is possible to improve both cooling performance and heating performance with minimum parts and a simple structure.
    Type: Application
    Filed: October 22, 2014
    Publication date: April 23, 2015
    Inventors: Geunho JIN, Kiwon SEO, Jongchul HA, Minsu PARK
  • Publication number: 20150107282
    Abstract: The invention discloses a controller for a vapour compression system for cooling a refrigerated space. The system comprises a circuit for circulation of a refrigerant between a compressor, a condenser, and an evaporator. An expansion valve controls a flow of the refrigerant into the evaporator and thereby cooling of the refrigerated space. The control system is adapted to control the expansion valve based on a first temperature in the circuit between the evaporator and the compressor and a second temperature determined in the refrigerated space.
    Type: Application
    Filed: March 19, 2013
    Publication date: April 23, 2015
    Applicant: Danfoss A/S
    Inventors: Roozbeh Izadi-Zamanabad, Harald Alnor
  • Patent number: 9003819
    Abstract: A heat pump apparatus includes: a refrigerant circuit which includes a compressor, an utilization-side heat exchanger, a first expansion valve, and an outdoor heat exchanger; an injection pipe which includes a solenoid switching valve and a second expansion valve; and an objective supercooling degree table which stores objective supercooling degrees according to condensing pressure in the refrigerant circuit and rotation number of the compressor. In the heat pump apparatus, liquid refrigerant is injected to the compressor by way of the injection pipe. The heat pump apparatus switches between a first case where the liquid refrigerant is injected to the compressor and a second case where the liquid refrigerant is not injected, and a value of the objective supercooling degree is changed between the first case and the second case to control the first expansion valve based on the value of the objective supercooling degree.
    Type: Grant
    Filed: September 24, 2010
    Date of Patent: April 14, 2015
    Assignee: Fujitsu General Limited
    Inventors: Atsushi Itagaki, Takashi Sugiyama, Toshiyuki Fuji
  • Patent number: 8997508
    Abstract: An object of the present invention is to keep an appropriate high pressure side pressure in a refrigerant circuit while reducing noises of an operation of a blower in a refrigerating apparatus which obtains a critical pressure on a high pressure side. The refrigerating apparatus in which the refrigerant circuit is constituted of a compressor, a gas cooler, a reducing element and an evaporator to obtain a supercritical pressure on the high pressure side includes a blower which air-cools the gas cooler and a control device which controls this blower. This control device controls a revolution speed of the blower based on an outdoor temperature and an evaporation temperature of a refrigerant in the evaporator.
    Type: Grant
    Filed: December 22, 2010
    Date of Patent: April 7, 2015
    Assignee: Panasonic Intellectual Property Management Co., Ltd.
    Inventors: Kazuhiko Mihara, Hidetaka Sasaki, Setsu Hasegawa, Ken Kawakubo, Masahisa Otake, Takashi Sato, Akira Matsuzaki
  • Patent number: 8991199
    Abstract: A heat pump system includes: a heat-source-side refrigerant circuit having a heat-source-side compressor, a first usage-side heat exchanger operable as a radiator of heat-source-side refrigerant, and a heat-source-side heat exchanger operable as an evaporator of heat-source-side refrigerant; and a usage-side refrigerant circuit having a usage-side compressor arranged to compress usage-side refrigerant with a pressure of the usage-side refrigerant corresponding to a saturated gas temperature of 65° C. that is 2.8 MPa or less at gauge pressure, a refrigerant-water heat exchanger operable as a radiator of usage-side refrigerant to heat an aqueous medium, and a first usage-side heat exchanger operable as an evaporator of usage-side refrigerant by the radiation of heat-source-side refrigerant. The weight of usage-side refrigerant enclosed in the usage-side refrigerant circuit is one to three times the weight of refrigeration machine oil enclosed to lubricate the usage-side compressor.
    Type: Grant
    Filed: February 23, 2010
    Date of Patent: March 31, 2015
    Assignees: Daikin Industries, Ltd., Daikin Europe N.V.
    Inventor: Masahiro Honda
  • Patent number: 8984903
    Abstract: A refrigerant cycle device includes a first refrigerant passage for guiding refrigerant from a refrigerant radiator to an inlet side of an outdoor heat exchanger, a first throttle part capable of varying an opening area of the first refrigerant passage, a second refrigerant passage for guiding the refrigerant from the outdoor heat exchanger to a compressor-suction side, a first opening/closing part for opening/closing the second refrigerant passage, a third refrigerant passage for guiding the refrigerant from the outdoor heat exchanger to the compressor-suction side via an evaporator, a second throttle part capable of varying an opening area of the third refrigerant passage, a bypass passage for guiding the refrigerant flowing between the refrigerant radiator and the first throttle part to a position between the outdoor heat exchanger and the second throttle part in the third refrigerant passage, and a second opening/closing part for opening/closing the bypass passage.
    Type: Grant
    Filed: April 3, 2012
    Date of Patent: March 24, 2015
    Assignee: Denso Corporation
    Inventors: Satoshi Itoh, Atsushi Inaba, Mikiharu Kuwahara
  • Patent number: 8978402
    Abstract: A heat pump apparatus includes: a refrigerant circuit which includes a compressor, a utilization-side heat exchanger for exchanging heat between water and refrigerant, an electronic expansion valve, and an outdoor heat exchanger; a controller which controls the compressor and the electronic expansion valve; a subcooling value calculating unit which calculates a subcooling value of the refrigerant circuit; a condensing pressure detector which detects condensing pressure of the compressor; a compressor rotation number detector which detects rotation number of the compressor; and an objective subcooling value extracting unit which selects and extracting an objective subcooling value stored in advance, from the condensing pressure and the rotation number of the compressor. The controller adjusts an opening degree of the electronic expansion valve so that the calculated subcooling value of the refrigerant circuit reaches the objective subcooling value.
    Type: Grant
    Filed: September 24, 2010
    Date of Patent: March 17, 2015
    Assignee: Fujitsu General Limited
    Inventors: Atsushi Itagaki, Takashi Sugiyama, Toshiyuki Fuji, Hiroshi Abiko
  • Publication number: 20150068238
    Abstract: When a fully-closable expansion valve is used, there is a possibility that the expansion valve is fully closed thereby to block a refrigerant circuit. In an air conditioner 1 of the present invention, an indoor heat exchanger 14 includes an auxiliary heat exchanger 20 and a main heat exchanger 21 disposed leeward from the auxiliary heat exchanger 20. In an operation in a predetermined dehumidification operation mode, a liquid refrigerant supplied to the auxiliary heat exchanger 20 all evaporates midway in the auxiliary heat exchanger 20, i.e., before reaching the outlet. Therefore, only an upstream partial area in the auxiliary heat exchanger 20 is an evaporation region, while an area downstream of the evaporation region in the auxiliary heat exchanger 20 is a superheat region. Further, an evaporation temperature sensor 30 which detects an evaporation temperature is disposed downstream of an expansion valve 13 in an outdoor unit 3.
    Type: Application
    Filed: April 4, 2013
    Publication date: March 12, 2015
    Applicant: DAIKIN INDUSTRIES, LTD.
    Inventors: Tomoyuki Haikawa, Youichi Ohnuma, Tomoatsu Minamida
  • Patent number: 8973385
    Abstract: A temperature controlled case is provided that includes an enclosure defining an airspace for receiving products therein, a refrigeration system configured to circulate a refrigerant through an expansion device and at least one cooling element to cool the airspace and a control module having a first predetermined setpoint corresponding to a first cooling mode and a second predetermined setpoint corresponding to a second cooling mode. The control module is configured to determine which one of the first cooling mode and the second cooling mode the refrigeration system is to operate within and to apply the corresponding predetermined setpoint for reference in modulating a position of the expansion device.
    Type: Grant
    Filed: February 29, 2008
    Date of Patent: March 10, 2015
    Assignee: Hill Phoenix, Inc.
    Inventor: Timothy Dean Swofford
  • Publication number: 20150059380
    Abstract: An air-conditioning apparatus includes a compressor, an indoor heat exchanger configured to function as a condenser or an evaporator, indoor heat exchanges each configured to function as a condenser or an evaporator, a plurality of expansion valves each provided for a corresponding one of the indoor heat exchangers each configured to adjust a flow rate of a refrigerant that flows through the corresponding indoor heat exchanger and a controller configured to control an operation capacity of the compressor and opening degrees of a plurality of expansion devices. When increasing heat exchange performance of the indoor heat exchanger, the controller increases the operation capacity of the compressor and controls the opening degree of the expansion valve corresponding to the indoor heat exchanger to decrease the flow rate of the refrigerant that flows through the indoor heat exchanger.
    Type: Application
    Filed: March 27, 2012
    Publication date: March 5, 2015
    Applicant: Mitsubishi Electric Corporation
    Inventors: Keisuke Takayama, Osamu Morimoto, Daisuke Shimamoto, So Nomoto, Kosuke Tanaka
  • Patent number: 8966919
    Abstract: An air conditioning apparatus includes a heat source unit, usage units, and a controller. The heat source unit has a compression mechanism, a heat-source-side heat exchanger operable at least as an evaporator, and a heat-source-side expansion valve. The usage units have usage-side heat exchangers operable at least as condensers, and usage-side expansion valves. The controller regulates the opening degree of the heat-source-side expansion valve based on the opening degrees of the usage-side expansion valves.
    Type: Grant
    Filed: July 21, 2011
    Date of Patent: March 3, 2015
    Assignee: Daikin Industries, Ltd.
    Inventors: Kousuke Kibo, Shinichi Kasahara
  • Publication number: 20150052922
    Abstract: An air-conditioning apparatus includes a time constant calculation unit that estimates a response time constant at a time when an opening degree of an expansion device is changed on the basis of specifications of a compressor that forms a refrigeration cycle of the air-conditioning apparatus, specifications of a load side heat exchanger, and an operating state quantity of the air-conditioning apparatus, a control constant calculation means that calculates at least one of a control gain of the opening degree of the expansion device and a control interval on the basis of a calculation result of the time constant calculation means, and a control constant change means that changes a control constant.
    Type: Application
    Filed: April 26, 2012
    Publication date: February 26, 2015
    Applicant: Mitsubishi Electric Corporation
    Inventors: Kosuke Tanaka, Hiroaki Makino, Akinori Sakabe, Tadashi Ariyama
  • Patent number: 8959940
    Abstract: In the invention, control of the expansion device is carried out based on the temperature difference between the refrigerant temperature of the first representative point that becomes a predetermined enthalpy under the refrigerant pressure of the gas cooler and the detection temperature of the outlet temperature sensor, and control of the rotation speed of the compressor and/or the rotation speed of the heat medium sending device is/are carried out based on the second representative point that is, under the refrigerant pressure of the gas cooler, a temperature different from the first representative point.
    Type: Grant
    Filed: February 12, 2010
    Date of Patent: February 24, 2015
    Assignee: Mitsubishi Electric Corporation
    Inventors: Koji Yamashita, Hiroyuki Morimoto, Takeshi Hatomura
  • Publication number: 20150047378
    Abstract: A heat pump circuit including a compressor that compresses a working fluid from a gas in a low pressure, low temperature first state to a high pressure, a high temperature second state. A first subflow of the working fluid is condensed into a gaseous/liquid mixture and assumes a third state by the working fluid delivering heat to a first medium. The first subflow of the working fluid is expanded and returns to a gas in the first state by absorbing heat from a second medium, whereupon the working fluid completes the cycle again. A second subflow of the compressed working fluid is expanded from the second state and the energy contents in the second subflow converted into electrical energy, whereafter the expanded working fluid is returned to the compressor after passage of the evaporator, or after expansion in the energy converter from the second to the first state.
    Type: Application
    Filed: March 19, 2013
    Publication date: February 19, 2015
    Inventor: Hardy Hollingworth
  • Publication number: 20150040594
    Abstract: A vehicle air conditioning apparatus is provided that can prevent temperature variations of the air after the heat exchange in a radiator to reliably control the temperature of the air supplied to the vehicle interior. During the heating operation and the heating and dehumidifying operation, target degree of supercooling SCt when target air-blowing temperature TAO is a predetermined temperature or higher is set to SCt1 that is greater than SCt2 when the target air-blowing temperature TAO is lower than the predetermined temperature. When amount of air Ga supplied from indoor fan 12 is lower than a predetermined value, the target degree of supercooling SCt is corrected, which is set such that the degree of supercooling is lower than target degree of supercooling corrected when the amount of air Ga supplied from the indoor fan 12 is a predetermined value or higher.
    Type: Application
    Filed: March 2, 2012
    Publication date: February 12, 2015
    Inventors: Kenichi Suzuki, Atsuo Inoue, Hidenori Takei
  • Publication number: 20150034293
    Abstract: An air-conditioning apparatus according to the present invention includes at least indoor heat exchangers. In response to a request to increase heat exchange performance from the indoor heat exchanger, the air-conditioning apparatus decreases a heat exchange capacity of an outdoor heat exchanger and controls an opening degree of an expansion valve corresponding to the indoor heat exchanger a to decrease a flow rate of a refrigerant that flows through the indoor heat exchanger.
    Type: Application
    Filed: March 27, 2012
    Publication date: February 5, 2015
    Applicant: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Keisuke Takayama, Osamu Morimoto, Daisuke Shimamoto
  • Publication number: 20150027139
    Abstract: A system including a setpoint module, a summer, a control module, and an expansion valve module. The setpoint module is configured to indirectly control sub-cooling of a condenser by adjusting a superheat setpoint based on (i) a return air temperature setpoint or a supply air temperature setpoint, and (ii) an outdoor ambient temperature. The summer is configured to determine an error between the superheat setpoint and a superheat level of a compressor. The control module is configured to generate a control signal based on the error. The expansion valve module is configured to electronically control a state of an expansion valve based on the control signal.
    Type: Application
    Filed: October 15, 2014
    Publication date: January 29, 2015
    Applicant: Liebert Corporation
    Inventors: Zhiyong LIN, Benedict J. DOLCICH, John F. JUDGE
  • Publication number: 20150020533
    Abstract: The invention relates to an air-conditioning loop for heating, ventilation, and/or air-conditioning equipment in which a coolant circulates. The loop including a compressor comprising a coolant outlet connected to a delivery pipe and a coolant inlet connected to a suction pipe. The loop also including an internal heat exchanger which is capable of functioning at least as a condenser, and which is connected to the compressor via the delivery pipe. The loop also including an external unit which is connected to the compressor via the suction pipe and which includes at least one external heat exchanger capable of functioning at least as an evaporator, with the internal heat exchanger being connected to the external unit via a first intermediate duct comprising at least one pressure-release member. The loop includes a deicing pipe connected to the compressor and/or to the delivery pipe, as well as to the external unit.
    Type: Application
    Filed: February 12, 2013
    Publication date: January 22, 2015
    Inventor: Jin Ming Liu
  • Publication number: 20150013366
    Abstract: A temperature control system employing a two-phase refrigerant and a compressor/condenser loop is disclosed wherein a two phase refrigerant condenses within the load, the system including a thermo-expansion valve that simultaneously allows refrigerant flow through the thermo-expansion valve and regulates a temperature of the refrigerant in its two phase state ahead of the thermo-expansion valve, and wherein a flow through the thermo-expansion valve occurs only after a pressure and temperature upstream of the thermo-expansion valve reaches a final temperature and pressure.
    Type: Application
    Filed: July 9, 2014
    Publication date: January 15, 2015
    Inventor: Kenneth W. Cowans
  • Publication number: 20150013367
    Abstract: A cooling apparatus for a vehicle includes a compressor 40 and a condenser 38 arranged for flow of refrigerant. The condenser can be connected to a cabin cooling expansion valve 41 positioned between the condenser and a cabin cooling heat exchanger 50 used to cool a passenger cabin 13 of the vehicle. A battery cooling heat exchanger 32 is connected to the condenser and is used to cool a traction motor battery of the vehicle. A battery cooling expansion valve 31 is connected to the condenser and the battery cooling heat exchanger. At least one of the cabin cooling expansion valve 41 and the battery cooling expansion valve 31 is an electronic expansion valve. A controller 80 can control the one or more electronic expansion valves based on desired refrigerant flow rates through the cabin cooling heat exchanger and the battery cooling heat exchanger.
    Type: Application
    Filed: February 25, 2013
    Publication date: January 15, 2015
    Inventor: Neil Carpenter