Of Unitary Motor-compressor In Casing Patents (Class 62/469)
  • Patent number: 10670030
    Abstract: A turbo machine of the present disclosure includes a rotation shaft, a first bearing, a casing, an impeller, a first space, a second space, a storage tank, a first outlet passage, a supply passage, a pump, a main passage, and a sub-passage. The second space is in communication with a space formed between a bearing surface of the first bearing and an outer surface of the rotation shaft. The main passage is in communication with the second space and extends in the rotation shaft from an end of the rotation shaft in an axial direction of the rotation shaft. The sub-passage is formed in the rotation shaft and allows communication between the space between the bearing surface of the first bearing and the outer surface of the rotation shaft and the main passage.
    Type: Grant
    Filed: April 26, 2016
    Date of Patent: June 2, 2020
    Assignee: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.
    Inventors: Akira Hiwata, Kazuyuki Kouda, Mamoru Nishibu, Tadayoshi Shoyama, Takeshi Ogata, Hidetoshi Taguchi
  • Patent number: 9973129
    Abstract: A power factor optimized variable speed drive unit for an electric motor of an HVAC device is disclosed. In an embodiment, the unit includes a selectively-activatable power factor correction unit operatively associated with a switched mode power supply unit. A power measurement unit measures the input power of the electric motor. A comparator unit compares the motor input power to a predetermined threshold. The comparator unit activates the power factor correction unit when the input power of the electric motor is above the threshold, and deactivates the power factor correction unit when the input power of the electric motor falls below the threshold. In an embodiment, motor input power is determined by the product of motor load current and motor speed.
    Type: Grant
    Filed: June 13, 2016
    Date of Patent: May 15, 2018
    Assignee: Trane International Inc.
    Inventors: Don A. Schuster, Chuan Yan
  • Patent number: 9581296
    Abstract: A system for supplying LNG fuel includes a fuel supplying line connected from an LNG storage tank to an engine, a boosting pump provided on the fuel supplying line and configured to pressurize LNG outputted from the LNG storage tank and cool down in a standby mode, a high pressure pump configured to pressurize the LNG outputted from the boosting pump to high pressure, and a return line connected between the LNG storage tank and the high pressure pump, in which the LNG is returned through the return line.
    Type: Grant
    Filed: October 23, 2013
    Date of Patent: February 28, 2017
    Assignee: Hyundai Heavy Industries Co., Ltd.
    Inventor: Tae Seok Lee
  • Patent number: 9551351
    Abstract: A compression device includes a first compressor and a second compressor mounted in parallel, each compressor including a leakproof enclosure including a low pressure portion containing a motor and an oil sump, an oil level equalization conduit putting into communication the oil sumps of the first and second compressors, and control means adapted for controlling the starting and the stopping of the first and second compressors. The first compressor includes first detection means coupled with the control means and adapted for detecting an oil level in the oil sump of the first compressor. The control means are adapted for controlling the stopping of the second compressor when the oil level detected by the first detection means falls below a first predetermined value.
    Type: Grant
    Filed: November 30, 2012
    Date of Patent: January 24, 2017
    Assignee: DANFOSS COMMERCIAL COMPRESSORS
    Inventors: Jean De Bernardi, Patrice Bonnefoi, Xavier Durand, Fabien Gall, Jean-Francois Le Coat
  • Patent number: 9115706
    Abstract: A compressor includes a housing, compression unit, discharge chamber, outlet, and oil separation structure. The oil separation structure, which is arranged between the discharge chamber and the outlet, includes an oil reservoir, oil separation compartment, intake passage, exhaust passage, and supply passage. The oil separation compartment is located upward from the oil reservoir. The intake passage, which extends upward from the oil separation compartment, draws refrigerant gas into the oil separation compartment from the discharge chamber to separate lubrication oil from the refrigerant gas. The exhaust passage extends upward from the oil separation compartment and discharges the refrigerant gas in the oil separation compartment out of the housing through the outlet. The supply passage extends upward from the oil separation compartment and has a larger cross-sectional area than the intake passage. The supply passage supplies the oil reservoir with lubrication oil from the oil separation compartment.
    Type: Grant
    Filed: March 18, 2013
    Date of Patent: August 25, 2015
    Assignee: Kabushiki Kaisha Toyota Jidoshokki
    Inventors: Masami Ohno, Masakazu Obayashi, Shinichi Sato, Akio Saiki, Akihiro Nakashima
  • Patent number: 8978400
    Abstract: This invention relates generally to oil lubricated helium compressor units for use in cryogenic refrigeration systems, operating on the Gifford McMahon (GM) cycle. The objective of this invention is to keep the oil separator and absorber, which are components in an oil lubricated, helium compressor, in an indoor air conditioned environment while rejecting at least 65% of the heat from the compressor outdoors during the summer. The balance of the heat is rejected to either the indoor air conditioned air, or cooling water. This is accomplished by circulating hot oil at high pressure to an outdoor air cooled heat exchanger and returning cooled oil to the compressor inlet, while hot high pressure helium is cooled in an air or water cooled heat exchanger in an indoor assembly that includes the compressor, an oil separator, an oil absorber, and other piping and control components. It is an option to reject the heat from the oil to the indoor space during the winter to save on the cost of heating the indoor space.
    Type: Grant
    Filed: July 8, 2010
    Date of Patent: March 17, 2015
    Assignee: Sumitomo (Shi) Cryogenics of America Inc.
    Inventors: Stephen Dunn, Ralph Longsworth
  • Patent number: 8959947
    Abstract: The present invention disclosures an oil balance device and a method for performing an oil balance operation between a plurality of compressor units, which are suitable for air conditioner units comprising at least two parallel connected compressor units. Each compressor unit comprises at least one parallel connected compressors. The oil balance device comprises an oil reservoir, a first pipe, a second pipe, a third pipe and a fourth pipe. The four pipes communicate with the oil reservoir respectively. Each pipe is provided with at least one valve to control the opening and the closing of the corresponding pipe.
    Type: Grant
    Filed: March 17, 2011
    Date of Patent: February 24, 2015
    Assignees: Johnson Controls Technology Company, Johnson Controls Building Efficiency Technology (WUXI) Company
    Inventors: Stone Zhai, Xiucheng Ji, Zhonghua Gu
  • Patent number: 8733116
    Abstract: An oil level detecting device for a compressor and an air conditioning system having the same are provided. The oil level detecting device may be provided in a compressor including a compression device that introduces and compresses a working fluid, a driving device mechanically connected to the compression device that operates the compression device, and a case that accommodates the compression device and the driving device thereinside and having an oil storage space that stores oil at a lower portion thereof. The oil level detecting device may include a detector including a supporting portion configured to be attached to the case and a detecting portion that protrudes inside the case. At least one property of the detecting portion may vary according to an oil level inside the case. The oil level detecting device may also include a signal processor including an electronic element having at least one reference property.
    Type: Grant
    Filed: December 2, 2010
    Date of Patent: May 27, 2014
    Assignee: LG Electronics Inc.
    Inventors: Inho Won, Seheon Choi, Byeongchul Lee
  • Patent number: 8342827
    Abstract: Disclosed are a hermetic compressor and a refrigeration cycle device having the same. An oil separator for separating oil from a refrigerant is installed outside a casing. The oil separated by the oil separator is recollected into the casing by an oil pump driven by a driving force of a driving motor. The oil is recollected from the refrigerant and fabrication costs are be reduced. A cooling capability of the refrigeration cycle device is enhanced, the compressor has a simplified configuration, and the fabrication costs are reduced. Because an outlet of a discharge opening through which oil is discharged to the casing from the oil pump is installed at a position lower than a minimum level of oil in the casing, the refrigerant is prevented from backflowing into an oil passage, and the occurrence of air bubbles on the surface of oil in the compressor may be prevented.
    Type: Grant
    Filed: November 13, 2009
    Date of Patent: January 1, 2013
    Assignee: LG Electronics Inc.
    Inventors: Nam-Kyu Cho, Hyo-Keun Park, Byeong-Chul Lee, Se-Heon Choi
  • Patent number: 8316663
    Abstract: An expander-compressor unit (30) includes: a closed casing (1) holding an oil at a bottom portion thereof; a motor (2) provided in the closed casing (1); a compression mechanism (3) for compressing a refrigerant and discharging it into the closed casing (1), the compression mechanism (3) being disposed below the motor (2) in the closed casing (1); an expansion mechanism (4) disposed below the compression mechanism (3) in the closed casing (1); and a coupling mechanism (50) for coupling a compression mechanism side shaft (5) to an expansion mechanism side shaft (6). An oil supply passage (53) for supplying the oil to the compression mechanism (3) is formed in the compression mechanism side shaft (5). An oil suction port (53A) is provided in a portion of the compression mechanism side shaft (5), the portion being above the expansion mechanism (4).
    Type: Grant
    Filed: April 2, 2008
    Date of Patent: November 27, 2012
    Assignee: Panasonic Corporation
    Inventors: Atsuo Okaichi, Yasufumi Takahashi, Hiroshi Hasegawa, Masaru Matsui, Fuminori Sakima
  • Publication number: 20100122549
    Abstract: To a hermetic compressor and a refrigeration cycle device having the same, an oil separator for separating oil from a refrigerant discharged from a compression unit is added. Separated oil is recollected into an oil pump driven by a driving motor. Because refrigerant separated from the oil is prevented from being re-introduced into the compressor, a cooling capability of the refrigeration cycle device may be enhanced. Because the oil pump is driven by the driving force of the driving motor, the compressor may have a simplified configuration, and the fabrication costs may be reduced. The oil used for a crankshaft lubrication process is returned to the oil pump by forming an oil pocket between bearing surfaces of a crankshaft and the oil pump, oil may be prevented from back-flowing to the oil separator from the crankshaft. This may allow oil to be smoothly recollected into the oil pump.
    Type: Application
    Filed: November 13, 2009
    Publication date: May 20, 2010
    Inventors: Nam-Kyu Cho, Hyo-Keun Park, Byeong-Chul Lee, Se-Heon Choi
  • Publication number: 20090031753
    Abstract: A compressor is provided that includes a casing defining an inner space, a suction pipe connected to the casing, a discharge pipe connected to the casing, a motor located at the inner space of the casing, a compressing unit driven by the motor to compress a refrigerant, an oil separating unit configured to separate oil from the refrigerant discharged from the compressing unit, and an oil recollecting unit configured to pump the oil separated by the oil separating unit and recollect the separated oil into the compressor main body.
    Type: Application
    Filed: July 29, 2008
    Publication date: February 5, 2009
    Inventors: Byung-Kil YOO, Nam-Kyu Cho, Dong-Koo Shin, Yang-Hee Cho, Hyo-Keun Park, Cheol-Hwan Kim
  • Patent number: 7296435
    Abstract: A refrigerating system includes: an evaporator (2) for performing a cooling operation as a refrigerant is evaporated; a compressor (4) for compressing the refrigerant discharged from the evaporator as a mover is reciprocally moved; a condenser (6) for changing the refrigerant compressed in the reciprocating compressor to a liquid refrigerant; and a capillary tube (8) for decompressing the refrigerant discharged from the condenser and transferring it to the evaporator. The refrigerant is an HFC refrigerant, hydrogenated carbon fluoride comprising hydrogen, fluorine and carbon and the lubricant is an ester-based lubricant, a sort of synthetic fluid, so that a lubricating performance and a performance of the refrigerating system can be improved.
    Type: Grant
    Filed: July 10, 2003
    Date of Patent: November 20, 2007
    Assignee: LG Electronics Inc.
    Inventor: Gi-Bong Kwon
  • Publication number: 20070175239
    Abstract: A refrigerant compressor forms a refrigerant circulation circuit with an external refrigerant circuit, and includes an oil separation structure. The oil separation structure includes a plurality of separation chambers for centrifugally separating oil from refrigerant gas, an oil storage chamber for storing the oil separated in the plurality of separation chambers, a connection passage and an oil passage. The plurality of separation chambers and the oil storage chamber are recessed within thickness of a circumferential wall of a housing component so as to be juxtaposed in a transverse direction passing across the housing component. The connection passage connects the plurality of separation chambers, and extends in the transverse direction along the refrigerant gas flow in a discharge path. The oil passage connects the oil storage chamber and the separation chambers, and extends in the transverse direction.
    Type: Application
    Filed: January 31, 2007
    Publication date: August 2, 2007
    Inventor: Yoshinori Inoue
  • Patent number: 7231783
    Abstract: A refrigeration system includes a compressor having a compressor housing and operable to compress a flow of refrigerant. A pump is operable to provide a flow of oil to the compressor. A portion of the oil mixes with the flow of refrigerant and the remainder of the oil flows into the compressor housing. A valve is movable between an open position and a closed position. When in the closed position, the valve is operable to inhibit the addition of oil above a predetermined level within the housing.
    Type: Grant
    Filed: August 25, 2005
    Date of Patent: June 19, 2007
    Assignee: Zero Zone, Inc.
    Inventors: Steve L. Esslinger, Erik B. Haffner
  • Patent number: 7210309
    Abstract: A variable displacement compressor for efficiently cooling and lubricating seals arranged on a rotary shaft. The seals are arranged at end portions of the rotary shaft that project from a housing of the compressor. A first lubrication chamber is defined by a first seal in the housing around the front end portion of the rotary shaft. A second lubrication chamber is defined by a second seal in the housing around the rear end portion of the rotary shaft. A shaft passage extends through the rotary shaft to connect the first and second lubrication chambers. Refrigerant gas including lubricating oil flows from a crank chamber to a suction chamber via the first lubrication chamber, the shaft passage, and the second lubrication chamber. This efficiently cools and lubricates the seals.
    Type: Grant
    Filed: April 22, 2004
    Date of Patent: May 1, 2007
    Assignee: Denso Corporation
    Inventors: Tetsuhiko Fukanuma, Masahiro Kawaguchi, Yasuharu Odachi, Masao Iguchi, Yoichi Takashima, Kazuhito Miyagawa
  • Patent number: 7207185
    Abstract: A vehicle air conditioning apparatus includes a refrigerant circulation circuit. The vehicle air conditioning apparatus has a variable displacement type compressor, a first pressure monitoring point, a second pressure monitoring point and an oil separator in the refrigerant circulation circuit. Also, the vehicle air conditioning apparatus has a control valve in the compressor. The compressor compresses refrigerant gas. Displacement of the compressor is variable. The refrigerant gas includes oil. The second pressure monitoring point is located more downstream than the first pressure monitoring point. The control valve controls the displacement based on differential pressure between the first and second pressure monitoring points. The oil separator is located between the first and second pressure monitoring points in order to separate the oil from the compressed refrigerant gas, thereby the oil separator serves as means for manifesting the differential pressure.
    Type: Grant
    Filed: December 16, 2003
    Date of Patent: April 24, 2007
    Assignee: General Electric Company
    Inventors: Masaki Ota, Tomoji Tarutani, Hisato Kawamura, Yoshinori Inoue, Masahiro Kawaguchi
  • Patent number: 7204098
    Abstract: The present invention relates to a structure for separating oil from a refrigerant gas containing the oil. The refrigerant gas is discharged from a refrigerant compressor which forms a part of refrigerating cycle to an external refrigerant circuit. The oil separation structure includes a separation chamber in which the oil is separated from the discharge refrigerant gas having a cylindrical inner surface, and a plurality of introduction passages through which the discharge refrigerant gas is introduced into the separation chamber. The oil is separated by centrifugal action from the discharge refrigerant gas by turning the discharge refrigerant gas introduced into the separation chamber along the cylindrical inner surface.
    Type: Grant
    Filed: April 28, 2004
    Date of Patent: April 17, 2007
    Assignee: Kabushiki Kaisha Toyota Jidoshokki
    Inventors: Yoshinari Yamada, Suguru Hirota, Hajime Kurita
  • Patent number: 6948916
    Abstract: A multiple hermetic compressor assembly comprising a first compressor and an adjacent, second compressor interconnected by a hot gas pressure discharge manifold, a suction gas pressure equalization manifold, a suction manifold and an oil equalization manifold, the manifolds including a plurality of the turns extending at right angles that minimizes vibrational-associated manifold stress failures by providing for adequate vibrational absorption in the manifolds and reduces hot gas discharge interference between the compressors.
    Type: Grant
    Filed: October 29, 2002
    Date of Patent: September 27, 2005
    Assignee: Global Energy Group, Inc.
    Inventor: Thomas Hebert
  • Patent number: 6807821
    Abstract: A rotary compressor having a housing with a motor and an internal accumulator located on the low pressure side and an oil sump located on the high pressure side. A sealing means positioned within the housing defines a first low pressure chamber and a second high pressure chamber. The sealing means substantially maintains the pressure differential between the chambers by segregating high pressure fluid in the high pressure chamber from low pressure fluid in the low pressure chamber. The fluid entering the housing is separated into a gas portion and a liquid portion, the liquid portion being directed downward toward the motor to provide cooling for the motor while the gas portion is directed to a compressor portion through a channeling means internal to the compressor housing. The liquid portion collects above the sealing means.
    Type: Grant
    Filed: August 20, 2003
    Date of Patent: October 26, 2004
    Assignee: Bristol Compressors, Inc.
    Inventor: John Kenneth Narney, II
  • Publication number: 20040165999
    Abstract: There is provided a rotary compressor capable of preventing deterioration of performance following plug fixing carried out to prevent falling-off of a spring member. The rotary compressor comprises a cylinder constituting a rotary compression element, a roller engaged with an eccentric portion formed in a rotary shaft of an electric element, and eccentrically rotated in the cylinder, a vane abutted on the roller to divide an inside of the cylinder into a low pressure chamber side and a high pressure chamber side, a spring member for always pressing the vane to the roller side, a housing portion of the spring member, formed in the cylinder, and opened to the vane side and a hermetically sealed container side, a plug positioned in the hermetically sealed container side of the spring member, and inserted into the housing portion to fit into a gap, and an O ring attached around the plug to seal a part between the plug and the housing portion.
    Type: Application
    Filed: March 2, 2004
    Publication date: August 26, 2004
    Applicant: SANYO ELECTRIC CO., LTD
    Inventors: Masaya Tadano, Haruhisa Yamasaki, Kenzo Matsumoto, Dai Matsuura, Kazuya Sato, Takayasu Saito, Toshiyuki Ebara, Satoshi Imai, Atsushi Oda, Takashi Sato, Hiroyuki Matsumori
  • Publication number: 20040118146
    Abstract: A substantially horizontal compressor including a housing having a main body portion with an open end. An end cap is secured to the main body portion with the end cap being provided with a plurality of apertures. The hermetic terminal body of the compressor is sealably fitted into one of the plurality of apertures located in the end cap. One of the apertures is sealably fitted with a heater well in which a substantially cylindrical heater element is removably received. A third aperture may be provided in the end cap in which a sight glass is sealably secured for checking the oil level in the oil sump. An indentation is formed in the end cap to increase the rigidity of the end cap. The proximity of the terminal assembly and heater well allows the wiring therefor to be part of the same wiring harness.
    Type: Application
    Filed: November 7, 2003
    Publication date: June 24, 2004
    Inventors: David K. Haller, Robin G. Skinner
  • Patent number: 6675607
    Abstract: An oil separator is provided on a bleeding channel inside the shaft 16. By integral rotation of the shaft 16 and a rotary valve, oil contained in a refrigerant gas is centrifuged via the oil separator. The separated oil is supplied to an interface between the rotary valve and a cylinder block, namely, a clearance portion of the rotary valve. The separated oil is also supplied into a clearance between a piston and a cylinder bore 12a via a suction port and a suction channel.
    Type: Grant
    Filed: November 12, 2002
    Date of Patent: January 13, 2004
    Assignee: Kabushiki Kaisha Toyota Jidoshokki
    Inventors: Tomoji Tarutani, Hirohiko Tanaka, Hisato Kawamura, Kenji Mochizuki
  • Patent number: 6672101
    Abstract: An oil storage area (45a) is defined on the bottom of a motor chamber (45) of a scroll compressor (1). An oil transfer route (4a) is defined in the portion of a center housing (4) that corresponds to the storage area (45a). Lubricating oil L is separated from the discharged, compressed refrigerant by an oil separator (80) and the lubricating oil L is supplied to the backside of a movable scroll (20) due to a pressure differential within the compress (1). After lubricating a bearing (10), the lubricating oil L is temporarily stored in the storage area (45a) and then is transferred due to a pressure differential to the suction-side of a compression mechanism (21) via the oil transfer route (4a). The lubricating oil L is then transferred to the oil separator (80) together with the compressed refrigerant that is discharged from a compression chamber (32) of the compression mechanism (21).
    Type: Grant
    Filed: March 25, 2002
    Date of Patent: January 6, 2004
    Assignee: Kabushiki Kaisha Toyota Jidoshokki
    Inventors: Hiroyuki Gennami, Kazuhiro Kuroki, Ken Suitou, Naohiro Nakajima, Shinji Tsubai, Kazuya Kimura
  • Publication number: 20030230090
    Abstract: A method of draining and recharging a hermetic compressor with oil using a drainage assembly mounted in the compressor housing. The assembly includes a tube having a valve mounted at one end thereof with the second end of the tube located in the oil sump of the housing. To drain the compressor oil, refrigerant flowing through the discharge and suction lines is shut off. Refrigerant is purged from the housing to create a vacuum therein and the housing is charged with a gas such as dry air or nitrogen. As the compressor housing is charged with gas, the pressure inside the housing increases, forcing the oil through the drainage assembly and out of the compressor. To recharge the compressor with oil, the gases are purged creating a vacuum in the housing. A predetermined amount of oil is drawn into the housing through a service hose. The compressor is purged and recharged with refrigerant.
    Type: Application
    Filed: June 9, 2003
    Publication date: December 18, 2003
    Inventors: Sukru Erisgen, James D. Rutz
  • Publication number: 20030089123
    Abstract: An oil separator is provided on a bleeding channel inside the shaft 16. By integral rotation of the shaft 16 and a rotary valve, oil contained in a refrigerant gas is centrifuged via the oil separator. The separated oil is supplied to an interface between the rotary valve and a cylinder block, namely, a clearance portion of the rotary valve. The separated oil is also supplied into a clearance between a piston and a cylinder bore 12a via a suction port and a suction channel.
    Type: Application
    Filed: November 12, 2002
    Publication date: May 15, 2003
    Inventors: Tomoji Tarutani, Hirohiko Tanaka, Hisato Kawamura, Kenji Mochizuki
  • Patent number: 6516627
    Abstract: An evaporator for a refrigeration chiller includes a tube bundle in which at least a portion of the tubes of the tube bundle are immersed in a pool which include both liquid refrigerant and is lubricant. Liquid refrigerant and lubricant are deposited into the pool at a first pool location. Because of the vaporization of refrigerant that occurs within the pool, a pattern of flow is established and managed that causes the lubricant in the pool to migrate from the location of its deposit into the pool to a second pool location. An outlet is provided at the second pool location from which lubricant is drawn out of the evaporator.
    Type: Grant
    Filed: May 4, 2001
    Date of Patent: February 11, 2003
    Assignee: American Standard International Inc.
    Inventors: H. Kenneth Ring, Jon P. Hartfield, Sean A. Smith, William J. Peck
  • Publication number: 20020134101
    Abstract: An oil storage area (45a) is defined on the bottom of a motor chamber (45) of a scroll compressor (1). An oil transfer route (4a) is defined in the portion of a center housing (4) that corresponds to the storage area (45a). Lubricating oil L is separated from the discharged, compressed refrigerant by an oil separator (80) and the lubricating oil L is supplied to the backside of a movable scroll (20) due to a pressure differential within the compress (1). After lubricating a bearing (10), the lubricating oil L is temporarily stored in the storage area (45a) and then is transferred due to a pressure differential to the suction-side of a compression mechanism (21) via the oil transfer route (4a). The lubricating oil L is then transferred to the oil separator (80) together with the compressed refrigerant that is discharged from a compression chamber (32) of the compression mechanism (21).
    Type: Application
    Filed: March 25, 2002
    Publication date: September 26, 2002
    Applicant: Kabushiki Kaisha Toyota Jidoshokki
    Inventors: Hiroyuki Gennami, Kazuhiro Kuroki, Ken Suitou, Naohiro Nakajima, Shinji Tsubai, Kazuya Kimura
  • Patent number: 6446462
    Abstract: 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: Grant
    Filed: July 5, 2001
    Date of Patent: September 10, 2002
    Assignee: Sanyo Electric Co., Ltd.
    Inventors: Yasunori Kiyokawa, Yoshinori Noboru, Kazuyoshi Sugimoto, Takashi Sato, Jyunichi Suzuki, Kenji Aida
  • Publication number: 20020116940
    Abstract: The present invention relates to the art of refrigeration and more particularly to a method of regulating the cooling process by controlling the oil pressure in a compressor. The system prevents the accumulation of the liquid refrigerant in the crankcase of the compressor. The system allows a compressor to continue to work without interruption.
    Type: Application
    Filed: February 27, 2001
    Publication date: August 29, 2002
    Inventors: Mikhail Levitin, Boris Khaytin
  • Publication number: 20020078697
    Abstract: Just before shutdown, or at least prior to a significant pressure equalization in a refrigeration system, an accumulator containing oil is isolated from the rest of the refrigeration system in such a way that oil is at a pressure that is higher than the pressure of the rest of the system. The oil in the accumulator is maintained in a state of higher pressure while the refrigeration system is shutdown with the aid of a spring-loaded piston. Preliminary to start up of the refrigeration system, the pressurized oil is placed in fluid communication with structure requiring lubrication which is thereby lubricated.
    Type: Application
    Filed: December 22, 2000
    Publication date: June 27, 2002
    Inventor: Alexander Lifson
  • Patent number: 6363741
    Abstract: A refrigerant composition comprising difluoromethane (R-32), pentafluoroethane (R-125), 1,1,1,2-tetrafluoroethane (R-134a), and n-pentane, preferably prepared by mixing n-pentane preliminarily in R-134a, and mixing into a refrigerant of R-32 and R-125, with the n-pentane contained in a range of 0.1 wt. % to 14 wt. % of the total weight, and a refrigerating apparatus employing the refrigerant composition composed of above. It is an object of the present invention to develop a nonflammable refrigerant composition capable of using refrigerating machine oil such as mineral oil and alkyl benzene which is used in refrigerating apparatus, none in risk of destroying the ozone layer, excellent in cooling performance, superior in lubricating performance, and outstanding in heat resistance.
    Type: Grant
    Filed: April 2, 2001
    Date of Patent: April 2, 2002
    Assignee: Sanyo Electric Co., Ltd.
    Inventor: Kazuo Takemasa
  • Publication number: 20020023459
    Abstract: 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: Application
    Filed: July 5, 2001
    Publication date: February 28, 2002
    Inventors: Yasunori Kiyokawa, Yoshinori Noboru, Kazuyoshi Sugimoto, Takashi Sato, Jyunichi Suzuki, Kenji Aida
  • Patent number: 6237362
    Abstract: An internal oil separator for compressors of refrigeration systems is disclosed. This oil separator supplies an effective quantity of lubrication oil to the drive parts of a compressor, and protects the compressor from being unexpectedly damaged or locked. The oil separator accomplishes the recent trend of compactness of compressors, and prevents a bypass flow of the compressed refrigerant into the compressor. This oil separator collaterally reduces operational noises of the compressor. In this oil separator, an oil-separating chamber 21, having a generally U-shaped passage, is defined in the rear section of a compressor housing by a cover 2. The oil-separating chamber 21 has a guide wall 22, thus forming a desired U-shaped passage therein. Refrigerant inlet and outlet ports 13, 14 are formed on the rear wall of the housing. An oil-collecting part 17 is formed on the bottom of the oil-separating chamber 21 and stores recovered oil therein.
    Type: Grant
    Filed: April 13, 2000
    Date of Patent: May 29, 2001
    Assignee: Halla Climate Control Corp.
    Inventor: Kil Sang Jang
  • Patent number: 6216474
    Abstract: Lubrication supply to the rotors of a variable speed screw compressor is optimized for full load and a supplemental supply path is provided which is opened during low speed operation.
    Type: Grant
    Filed: September 27, 1999
    Date of Patent: April 17, 2001
    Assignee: Carrier Corporation
    Inventor: Vishnu M. Sishtla
  • Patent number: 6205808
    Abstract: A screw compressor in a refrigeration chiller includes one or more baffles disposed in the compressor housing so as to intercept and redirect oil which may flow and/or be blown, under certain operating conditions, in an upstream direction against the stream of suction gas that flows into the compressor from the evaporator. The baffles cause oil to be retained in the compressor rather than being blown back to the system evaporator to ensure that sufficient oil is available to the compressor under all operating conditions and eliminates the need for structure/apparatus in the evaporator dedicated to returning such oil to the compressor.
    Type: Grant
    Filed: September 3, 1999
    Date of Patent: March 27, 2001
    Assignee: American Standard Inc.
    Inventor: Dennis M. Beekman
  • Patent number: 6167719
    Abstract: In a compressor of a refrigeration cycle using an HC-based refrigerant and a lubricant having specific gravity greater than that of the HC-based refrigerant and having no or no or less mutual solubility with the HC-based refrigerant, an oil reservoir is formed on a bottom of the compressor, the oil reservoir is provided at its portion with a recess, a suction port of a lubricant suction pipe for supplying the lubricant to a compressor mechanism is provided in the recess. With this feature, it is possible to sufficiently supply the lubricant to the compressor even when the lubricant has no or less mutual solubility, so that even if the amount of the lubricant is reduced, the lubricant can be sufficiently sucked from an inlet port of a lubricant pumping pipe and supplied to the compressor mechanism.
    Type: Grant
    Filed: April 5, 1999
    Date of Patent: January 2, 2001
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Yuichi Yakumaru, Yukio Watanabe, Akira Fujitaka, Hironao Numoto, Shigehiro Sato, Kanji Haneda, Yoshinori Kobayashi
  • Patent number: 6134911
    Abstract: A compressor (30) for use in a refrigerator, which has a rotary shaft (33) supported by bearings (39 to 42) to be lubricated by a liquid refrigerant and is adapted to permit the rotary shaft 33 to continue rotating for a while after a liquid refrigerant pump (36) is stopped at, for example, a power failure, thereby preventing the bearings (39 to 42) from being damaged. To that end, the compressor (30) is further provided with a header (52) for storing a predetermined amount of a high-pressure liquid refrigerant, and with check valves (51, 54 and 56) for maintaining the internal pressure of this header (52) at a high pressure for a predetermined time period after a power failure occurs.
    Type: Grant
    Filed: December 16, 1998
    Date of Patent: October 24, 2000
    Assignee: Mitsubishi Heavy Industries, Ltd.
    Inventors: Akio Kishimoto, Kenji Ueda, Zenichi Yoshida
  • Patent number: 6067804
    Abstract: Oil cooling is accomplished in a refrigeration chiller by flowing hot oil into heat exchange contact with liquid refrigerant which is sourced from the chiller's condenser and returned thereto. The rejection of heat from the oil to the refrigerant in an oil-cooling heat exchanger causes vaporization of the refrigerant and, in turn, creates a density difference in the refrigerant flowing from the condenser and refrigerant in and downstream of the oil-cooling heat exchanger. This density difference is responsible for inducing and maintaining refrigerant flow through the heat exchanger for oil cooling purposes.
    Type: Grant
    Filed: August 6, 1999
    Date of Patent: May 30, 2000
    Assignee: American Standard Inc.
    Inventors: Shane A. Moeykens, Benjamin E. Dingel, James W. Larson
  • Patent number: 6035963
    Abstract: An upper housing shell of a hermetically sealed refrigeration compressor has a central asymmetrical section interposed between a lower cylindrical section and an upper spherical section. The shape of the central section is such that opposite points define a line that is perpendicular to the surface at one point, but is not perpendicular to the surface at the opposite point.
    Type: Grant
    Filed: December 16, 1998
    Date of Patent: March 14, 2000
    Assignee: American Standard Inc.
    Inventor: John K. Wollitz
  • Patent number: 6018962
    Abstract: A refrigeration apparatus contains an oil sump having an interior portion. A housing is located, at least in part, within the oil sump interior. The housing has at least one inlet and at least one outlet. The inlet allows a vent gas stream to enter the housing and the outlet allows a vent gas stream to exit the housing. The inlet may be an aperture extending circumferentially around the housing about one-third to one-half of the housing's circumference. Additionally, the inlet should be above the surface level of any oil pool in the sump. A coalescing demister filter is located within the housing between the inlet and the outlet. The housing may include a wall for sheltering the filter from agitated areas of the gearbox. The filter is configured to remove substantially all of the oil from the vent gas stream. The filter may also have an outlet end which is sealed from the oil sump. The filter may also be pleated and enhances oil coalescence.
    Type: Grant
    Filed: December 16, 1998
    Date of Patent: February 1, 2000
    Assignee: American Standard Inc.
    Inventors: Randy E. Dewhirst, Matthew Cambio, Wayne G. Gorski
  • Patent number: 6010315
    Abstract: A compressor for use in a refrigerator, which has a rotary shaft supported by bearings to be lubricated by a liquid refrigerant and is adapted to permit the rotary shaft to continue rotating for a while after a liquid refrigerant pump is stopped at, for example, a power failure, thereby preventing the bearings from being damaged. To that end the compressor has a reservoir liquid tank for storing high pressure liquid refrigerant to be supplied to the bearing and a gas storage tank for storing high pressure gas. There is a valve system connected between the gas storage tank and the reservoir liquid tank which is operable upon a power failure to supply high pressure gas to the liquid storage tank.
    Type: Grant
    Filed: December 14, 1998
    Date of Patent: January 4, 2000
    Assignee: Mitsubishi Heavy Industries, Ltd.
    Inventors: Akio Kishimoto, Kenji Ueda, Zenichi Yoshida
  • Patent number: 6009722
    Abstract: A motor cooling structure for a turbo compressor is disclosed. The structure includes a refrigerant suction tube communicating with one lateral wall of the sealed container and extended from the evaporator, a first refrigerant flow tube communicating with another lateral wall of the sealed container, with the first refrigerant flow tube communicating with the first compression chamber, a second refrigerant flow tube through which the first compression chamber communicates with the second compression chamber, and a refrigerant discharge tube communicating with the second compression chamber communicating with a condenser, for thereby enhancing a cooling efficiency of the driving motor by directly introducing a low temperature refrigerant from an evaporator into a motor chamber.
    Type: Grant
    Filed: November 20, 1998
    Date of Patent: January 4, 2000
    Assignee: LG Electronics Inc.
    Inventors: Moon-Chang Choi, Hyeong-Seok Kim, Sang-Wook Lee
  • Patent number: 5996363
    Abstract: An air conditioning equipment is provided with an oil level equalizing system, which includes a plurality of low-pressure shell-type compressors communicating with a suction line through a plurality of branch portions, a plurality of connecting lines each communicating with a corresponding compressor shell at a location adjacent to a normal oil level in the shell, and an oil level equalizing line communicating with the plurality of connecting lines. The oil level equalizing system also includes a communication line, through which the suction line communicates with the oil level equalizing line at a location upstream of the plurality of branch portions with respect to a direction of flow of a refrigerant. This arrangement functions to increase the pressure within the oil level equalizing line to a value higher than that within the shell of each compressor.
    Type: Grant
    Filed: August 4, 1997
    Date of Patent: December 7, 1999
    Assignee: Masushita Refrigeration Company
    Inventors: Masao Kurachi, Takashi Kaneko, Michiyoshi Kusaka, Kazuo Nakatani
  • Patent number: 5950451
    Abstract: A closed reciprocating compressor for use in refrigeration cycle containing a refrigerant and a refrigerating machine oil, the refrigerant comprising a chlorine-free fluorocarbon and/or hydrofluorocarbon and having a critical temperature of 40.degree. C. or higher and said refrigerating machine oil being circulated in the refrigeration cycle, the refrigerating machine oil comprising as a base oil an ester oil of one or more fatty acids, containing at least two ester linkages in the molecule and having a viscosity at 40.degree. C. of 2 to 35 cSt and a viscosity at 100.degree. C. of 1 to 6 cSt, the motor having a winding wire and an insulating film comprising of a conductor, an insulating material and a winding oil, and the winding oil being an ester wax.
    Type: Grant
    Filed: October 24, 1997
    Date of Patent: September 14, 1999
    Assignee: Samsung Electronics Co., Ltd.
    Inventor: Ki Baek Kim
  • Patent number: 5937661
    Abstract: A compressor (30) for use in a refrigerator, which has a rotary shaft (33) supported by bearings (39 to 42) to be lubricated by a liquid refrigerant and is adapted to permit the rotary shaft 33 to continue rotating for a while after a liquid refrigerant pump (36) is stopped at, for example, a power failure, thereby preventing the bearings (39 to 42) from being damaged. To that end, the compressor (30) is further provided with a header (52) for storing a predetermined amount of a high-pressure liquid refrigerant, and with check valves (51, 54 and 56) for maintaining the internal pressure of this header (52) at a high pressure for a predetermined time period after a power failure occurs.
    Type: Grant
    Filed: December 16, 1998
    Date of Patent: August 17, 1999
    Assignee: Mitsubishi Heavy Industries, Ltd.
    Inventors: Akio Kishimoto, Kenji Ueda, Zenichi Yoshida
  • Patent number: 5939200
    Abstract: The present invention provides an insulating film for use in the motor of a refrigeration compressor using a substitute flon and a refrigerating machine oil in particular combination, which film is obtained by adding to a base film, or coating on the surface of a base film, a compound having at least one carbodiimide group, or, which film is made essentially of a compound having at least one carbodiimide group, represented by the following formula (1): ##STR1## or the following formula (2): ##STR2## or the following formula (3): ##STR3## or the following formula (4): ##STR4## This insulating film can eliminate the problems of the prior art, has excellent resistance to hydrolysis and forms no sludge, resultantly can prevent reduction in insulating property, and further has deterioration resistance to refrigerating machine oil.
    Type: Grant
    Filed: September 30, 1996
    Date of Patent: August 17, 1999
    Assignee: Nisshinbo Industries, Inc.
    Inventors: Satoshi Amano, Tomoki Nakamura, Takahiko Ito
  • Patent number: 5901559
    Abstract: An oil level regulator is disclosed for use in a refrigeration system which has an oil reservoir and at least one compressor with a crankcase for containing oil. The regulator has a body with an interior fluid chamber for receiving oil. An inlet communicates with the fluid chamber of the body and is connected by a conduit to the oil reservoir of the system. An outlet communicates from the fluid chamber through a conduit through to the crankcase of the compressor. A level detecting mechanism is disposed within the fluid chamber for detecting an oil level therein. The level detector mechanism includes a solenoid assembly which is actuated by the detector mechanism when the oil level within the chamber is determined to be at or below a predetermined level. A microprocessor is provided on the regulator which communicates with the detector mechanism and the solenoid assembly.
    Type: Grant
    Filed: September 9, 1998
    Date of Patent: May 11, 1999
    Assignee: AC&R Components, Inc.
    Inventors: Gary Westermeyer, Paul Isaacs
  • Patent number: 5881564
    Abstract: A compressor (30) for use in a refrigerator, which has a rotary shaft (33) supported by bearings (39 to 42) to be lubricated by a liquid refrigerant and is adapted to permit the rotary shaft 33 to continue rotating for a while after a liquid refrigerant pump (36) is stopped at, for example, a power failure, thereby preventing the bearings (39 to 42) from being damaged. To that end, the compressor (30) is further provided with a header (52) for storing a predetermined amount of a high-pressure liquid refrigerant, and with check valves (51, 54 and 56) for maintaining the internal pressure of this header (52) at a high pressure for a predetermined time period after a power failure occurs.
    Type: Grant
    Filed: October 23, 1997
    Date of Patent: March 16, 1999
    Assignee: Mitsubishi Heavy Industries, Ltd.
    Inventors: Akio Kishimoto, Kenji Ueda, Zenichi Yoshida
  • Patent number: 5806336
    Abstract: There are provided a highly durable and efficient refrigerating apparatus and a lubricating oil composition that uses an HFC type refrigerant and is still free from the problem of thermal hydrolysis of polyol-ester type oil and resulting generation of carboxylic acid and sludge so that the refrigerating apparatus and the lubricating oil composition may be used stably for a prolonged period of time. A lubricating oil composition according to the invention comprises as base oil components a polyol-ester type oil formed by reacting specific polyhydric alcohol with a fatty acid, to which tricresylphosphate and epoxy compound comprising glycidyl ether or carbodiimide are added at respective specific rates.
    Type: Grant
    Filed: November 29, 1995
    Date of Patent: September 15, 1998
    Assignee: Sanyo Electric Co., Ltd.
    Inventors: Takashi Sunaga, Yoshinobu Obokata, Masazo Okajima, Takeo Komatsubara, Yasuki Takahashi