Of Unitary Motor-compressor In Casing Patents (Class 62/469)
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Patent number: 11415136Abstract: Provided is a screw compressor including a screw rotor configured to compress a gas due to rotation of the screw rotor about an axis of the screw rotor and a casing housing the screw rotor rotatably and provided with a suction port for a gas, the casing being provided with a suction side space through which a gas flowing into the casing from the suction port and not yet sucked by the screw rotor flows. The casing is provided with a heating fluid passage for introducing a heating fluid into the suction side space so as to heat oil staying in the suction side space.Type: GrantFiled: June 10, 2019Date of Patent: August 16, 2022Assignee: KOBE STEEL, LTD.Inventors: Shugo Takaki, Yasushi Amano, Hirofumi Saito, Masato Hayashi
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Patent number: 11359630Abstract: A screw compressor for a utility vehicle includes at least one housing, at least one housing cover and at least one rotor housing. At least one seal is provided, wherein, when assembled, there is an oil sump in the housing, and the seal is arranged between the housing cover and the rotor housing and projects out of the oil sump with respect to the assembled state. The seal is formed as a sealing plate and has multiple passage openings.Type: GrantFiled: September 19, 2017Date of Patent: June 14, 2022Assignee: KNORR-BREMSE Systeme fuer Nutzfahrzeuge GmbHInventors: Gilles Hebrard, Jean-Baptiste Marescot, Joerg Mellar, Thomas Weinhold
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Patent number: 11333410Abstract: The invention provides a refrigeration apparatus configured to cool the interior of a casing of a heat source unit by a refrigerant. An air conditioner includes a heat source unit, a utilization unit having a utilization heat exchanger and constituting a refrigerant circuit along with the heat source unit, and a controller. The heat source unit causes heat exchange between a refrigerant and a heat source, and cools the interior of the casing, and causes a valve to switch to supply or not to supply the cooling heat exchanger with the refrigerant. The controller assesses, before the refrigerant is supplied to the cooling heat exchanger, whether or not the refrigerant flowing from the cooling heat exchanger toward the compressor comes into a wet state when the refrigerant is supplied, and determines whether or not to open the valve in accordance with an assessment result.Type: GrantFiled: July 17, 2018Date of Patent: May 17, 2022Assignee: DAIKIN INDUSTRIES, LTD.Inventor: Akiharu Kojima
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Patent number: 11268513Abstract: A screw compressor for a utility vehicle has at least one housing with at least one housing cover and with at least one rotor housing, at least one baffle plate and at least one seal. In the assembled state, an oil sump is present in the housing, wherein, with regard to the assembled state, the seal is arranged between housing cover and rotor housing and projects out of the oil sump. The seal at least partially separates the interior of the housing cover from the interior of the rotor housing. With regard to the assembled state, in the case of a substantially horizontal orientation of the screw-type compressor and in the case of a substantially horizontal orientation of the oil sump, the baffle plate is oriented substantially parallel to the upper level of the oil sump.Type: GrantFiled: September 19, 2017Date of Patent: March 8, 2022Assignee: KNORR-BREMSE Systeme fuer Nutzfahrzeuge GmbHInventors: Gilles Hebrard, Jean-Baptiste Marescot, Joerg Mellar, Thomas Weinhold
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Patent number: 11175079Abstract: A linear compressor is provided that may include a casing, a compressor body accommodated in the casing and defining a compression space for a refrigerant, a suction pipe coupled to a first side of the casing to supply the refrigerant to the compression space, a discharge pipe coupled to a second side of the casing to discharge the refrigerant compressed in the compression space outside of the casing, a process pipe coupled to the second side of the casing spaced apart from the discharge pipe to inject a refrigerant for supplement into the casing, and a separator that separates a mixed fluid of a refrigerant and oil injected through the process pipe.Type: GrantFiled: January 29, 2020Date of Patent: November 16, 2021Assignee: LG ELECTRONICS INC.Inventors: Kyeongweon Lee, Jeehyun Kim, Joonsung Park, Byunghoon Woo, Youngcheol Han
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Patent number: 11136980Abstract: A compressor includes a compression mechanism to compress gas and discharge compressed gas, an electric motor to drive the compression mechanism, a casing housing the compression mechanism and the electric motor, a suction pipe connected to a suction side of the compression mechanism via the casing, and a discharge pipe provided at the casing to open in a space in the casing. The space has a first space located below the motor, and a second space located above the motor. The compression mechanism is disposed in the first space. The compressor is provided with a partition plate disposed in the second space, and the having a gas passage hole. The partition plate further has an oil drain hole formed at a lower level than an open end of the gas passage hole, and located radially outside an outer peripheral surface of a rotor of the electric motor.Type: GrantFiled: February 9, 2018Date of Patent: October 5, 2021Assignee: Daikin Industries, Ltd.Inventor: Takashi Shimizu
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Patent number: 10670030Abstract: 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: GrantFiled: April 26, 2016Date of Patent: June 2, 2020Assignee: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.Inventors: Akira Hiwata, Kazuyuki Kouda, Mamoru Nishibu, Tadayoshi Shoyama, Takeshi Ogata, Hidetoshi Taguchi
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Patent number: 9973129Abstract: 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: GrantFiled: June 13, 2016Date of Patent: May 15, 2018Assignee: Trane International Inc.Inventors: Don A. Schuster, Chuan Yan
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Patent number: 9581296Abstract: 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: GrantFiled: October 23, 2013Date of Patent: February 28, 2017Assignee: Hyundai Heavy Industries Co., Ltd.Inventor: Tae Seok Lee
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Patent number: 9551351Abstract: 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: GrantFiled: November 30, 2012Date of Patent: January 24, 2017Assignee: DANFOSS COMMERCIAL COMPRESSORSInventors: Jean De Bernardi, Patrice Bonnefoi, Xavier Durand, Fabien Gall, Jean-Francois Le Coat
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Patent number: 9115706Abstract: 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: GrantFiled: March 18, 2013Date of Patent: August 25, 2015Assignee: Kabushiki Kaisha Toyota JidoshokkiInventors: Masami Ohno, Masakazu Obayashi, Shinichi Sato, Akio Saiki, Akihiro Nakashima
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Patent number: 8978400Abstract: 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: GrantFiled: July 8, 2010Date of Patent: March 17, 2015Assignee: Sumitomo (Shi) Cryogenics of America Inc.Inventors: Stephen Dunn, Ralph Longsworth
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Patent number: 8959947Abstract: 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: GrantFiled: March 17, 2011Date of Patent: February 24, 2015Assignees: Johnson Controls Technology Company, Johnson Controls Building Efficiency Technology (WUXI) CompanyInventors: Stone Zhai, Xiucheng Ji, Zhonghua Gu
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Patent number: 8733116Abstract: 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: GrantFiled: December 2, 2010Date of Patent: May 27, 2014Assignee: LG Electronics Inc.Inventors: Inho Won, Seheon Choi, Byeongchul Lee
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Patent number: 8342827Abstract: 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: GrantFiled: November 13, 2009Date of Patent: January 1, 2013Assignee: LG Electronics Inc.Inventors: Nam-Kyu Cho, Hyo-Keun Park, Byeong-Chul Lee, Se-Heon Choi
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Patent number: 8316663Abstract: 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: GrantFiled: April 2, 2008Date of Patent: November 27, 2012Assignee: Panasonic CorporationInventors: Atsuo Okaichi, Yasufumi Takahashi, Hiroshi Hasegawa, Masaru Matsui, Fuminori Sakima
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Publication number: 20100122549Abstract: 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: ApplicationFiled: November 13, 2009Publication date: May 20, 2010Inventors: Nam-Kyu Cho, Hyo-Keun Park, Byeong-Chul Lee, Se-Heon Choi
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Publication number: 20090031753Abstract: 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: ApplicationFiled: July 29, 2008Publication date: February 5, 2009Inventors: Byung-Kil YOO, Nam-Kyu Cho, Dong-Koo Shin, Yang-Hee Cho, Hyo-Keun Park, Cheol-Hwan Kim
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Patent number: 7296435Abstract: 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: GrantFiled: July 10, 2003Date of Patent: November 20, 2007Assignee: LG Electronics Inc.Inventor: Gi-Bong Kwon
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Publication number: 20070175239Abstract: 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: ApplicationFiled: January 31, 2007Publication date: August 2, 2007Inventor: Yoshinori Inoue
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Patent number: 7231783Abstract: 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: GrantFiled: August 25, 2005Date of Patent: June 19, 2007Assignee: Zero Zone, Inc.Inventors: Steve L. Esslinger, Erik B. Haffner
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Patent number: 7210309Abstract: 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: GrantFiled: April 22, 2004Date of Patent: May 1, 2007Assignee: Denso CorporationInventors: Tetsuhiko Fukanuma, Masahiro Kawaguchi, Yasuharu Odachi, Masao Iguchi, Yoichi Takashima, Kazuhito Miyagawa
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Patent number: 7207185Abstract: 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: GrantFiled: December 16, 2003Date of Patent: April 24, 2007Assignee: General Electric CompanyInventors: Masaki Ota, Tomoji Tarutani, Hisato Kawamura, Yoshinori Inoue, Masahiro Kawaguchi
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Patent number: 7204098Abstract: 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: GrantFiled: April 28, 2004Date of Patent: April 17, 2007Assignee: Kabushiki Kaisha Toyota JidoshokkiInventors: Yoshinari Yamada, Suguru Hirota, Hajime Kurita
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Patent number: 6948916Abstract: 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: GrantFiled: October 29, 2002Date of Patent: September 27, 2005Assignee: Global Energy Group, Inc.Inventor: Thomas Hebert
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Patent number: 6807821Abstract: 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: GrantFiled: August 20, 2003Date of Patent: October 26, 2004Assignee: Bristol Compressors, Inc.Inventor: John Kenneth Narney, II
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Publication number: 20040165999Abstract: 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: ApplicationFiled: March 2, 2004Publication date: August 26, 2004Applicant: SANYO ELECTRIC CO., LTDInventors: Masaya Tadano, Haruhisa Yamasaki, Kenzo Matsumoto, Dai Matsuura, Kazuya Sato, Takayasu Saito, Toshiyuki Ebara, Satoshi Imai, Atsushi Oda, Takashi Sato, Hiroyuki Matsumori
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Publication number: 20040118146Abstract: 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: ApplicationFiled: November 7, 2003Publication date: June 24, 2004Inventors: David K. Haller, Robin G. Skinner
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Patent number: 6675607Abstract: 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: GrantFiled: November 12, 2002Date of Patent: January 13, 2004Assignee: Kabushiki Kaisha Toyota JidoshokkiInventors: Tomoji Tarutani, Hirohiko Tanaka, Hisato Kawamura, Kenji Mochizuki
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Patent number: 6672101Abstract: 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: GrantFiled: March 25, 2002Date of Patent: January 6, 2004Assignee: Kabushiki Kaisha Toyota JidoshokkiInventors: Hiroyuki Gennami, Kazuhiro Kuroki, Ken Suitou, Naohiro Nakajima, Shinji Tsubai, Kazuya Kimura
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Publication number: 20030230090Abstract: 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: ApplicationFiled: June 9, 2003Publication date: December 18, 2003Inventors: Sukru Erisgen, James D. Rutz
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Publication number: 20030089123Abstract: 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: ApplicationFiled: November 12, 2002Publication date: May 15, 2003Inventors: Tomoji Tarutani, Hirohiko Tanaka, Hisato Kawamura, Kenji Mochizuki
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Patent number: 6516627Abstract: 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: GrantFiled: May 4, 2001Date of Patent: February 11, 2003Assignee: American Standard International Inc.Inventors: H. Kenneth Ring, Jon P. Hartfield, Sean A. Smith, William J. Peck
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Publication number: 20020134101Abstract: 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: ApplicationFiled: March 25, 2002Publication date: September 26, 2002Applicant: Kabushiki Kaisha Toyota JidoshokkiInventors: Hiroyuki Gennami, Kazuhiro Kuroki, Ken Suitou, Naohiro Nakajima, Shinji Tsubai, Kazuya Kimura
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Patent number: 6446462Abstract: It is desired to avoid lack of lubricant oil in any of a plurality of compressors disposed in parallel in a single refrigerant circuit. To achieve this result, a freezer unit is provided, wherein a first kind of oil return pipe leading to a refrigerant suction pipe of a first compressor from an oil separator installed in a discharged refrigerant junction pipe is installed, and a second kind of oil return pipe leading to a refrigerant suction pipe of a second compressor from the regular oil level height of the first compressor 1 is utilized.Type: GrantFiled: July 5, 2001Date of Patent: September 10, 2002Assignee: Sanyo Electric Co., Ltd.Inventors: Yasunori Kiyokawa, Yoshinori Noboru, Kazuyoshi Sugimoto, Takashi Sato, Jyunichi Suzuki, Kenji Aida
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Publication number: 20020116940Abstract: 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: ApplicationFiled: February 27, 2001Publication date: August 29, 2002Inventors: Mikhail Levitin, Boris Khaytin
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Publication number: 20020078697Abstract: 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: ApplicationFiled: December 22, 2000Publication date: June 27, 2002Inventor: Alexander Lifson
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Patent number: 6363741Abstract: 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: GrantFiled: April 2, 2001Date of Patent: April 2, 2002Assignee: Sanyo Electric Co., Ltd.Inventor: Kazuo Takemasa
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Publication number: 20020023459Abstract: It is an object of the invention to avoid lack of lubricant oil in any of a plurality of compressors disposed in parallel in a single refrigerant circuit. A freezer unit, wherein a first kind oil return pipe 18 leading to a refrigerant suction pipe 4 of a first compressor 1 from an oil separator installed in a discharged refrigerant junction pipe 8 is installed, and a second kind oil return pipe 12 leading to a refrigerant suction pipe 5 of a second compressor 2 from the regular oil level height of the first compressor 1.Type: ApplicationFiled: July 5, 2001Publication date: February 28, 2002Inventors: Yasunori Kiyokawa, Yoshinori Noboru, Kazuyoshi Sugimoto, Takashi Sato, Jyunichi Suzuki, Kenji Aida
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Patent number: 6237362Abstract: 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: GrantFiled: April 13, 2000Date of Patent: May 29, 2001Assignee: Halla Climate Control Corp.Inventor: Kil Sang Jang
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Patent number: 6216474Abstract: 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: GrantFiled: September 27, 1999Date of Patent: April 17, 2001Assignee: Carrier CorporationInventor: Vishnu M. Sishtla
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Patent number: 6205808Abstract: 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: GrantFiled: September 3, 1999Date of Patent: March 27, 2001Assignee: American Standard Inc.Inventor: Dennis M. Beekman
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Patent number: 6167719Abstract: 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: GrantFiled: April 5, 1999Date of Patent: January 2, 2001Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Yuichi Yakumaru, Yukio Watanabe, Akira Fujitaka, Hironao Numoto, Shigehiro Sato, Kanji Haneda, Yoshinori Kobayashi
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Patent number: 6134911Abstract: 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: GrantFiled: December 16, 1998Date of Patent: October 24, 2000Assignee: Mitsubishi Heavy Industries, Ltd.Inventors: Akio Kishimoto, Kenji Ueda, Zenichi Yoshida
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Patent number: 6067804Abstract: 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: GrantFiled: August 6, 1999Date of Patent: May 30, 2000Assignee: American Standard Inc.Inventors: Shane A. Moeykens, Benjamin E. Dingel, James W. Larson
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Patent number: 6035963Abstract: 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: GrantFiled: December 16, 1998Date of Patent: March 14, 2000Assignee: American Standard Inc.Inventor: John K. Wollitz
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Patent number: 6018962Abstract: 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: GrantFiled: December 16, 1998Date of Patent: February 1, 2000Assignee: American Standard Inc.Inventors: Randy E. Dewhirst, Matthew Cambio, Wayne G. Gorski
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Patent number: 6009722Abstract: 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: GrantFiled: November 20, 1998Date of Patent: January 4, 2000Assignee: LG Electronics Inc.Inventors: Moon-Chang Choi, Hyeong-Seok Kim, Sang-Wook Lee
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Patent number: 6010315Abstract: 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: GrantFiled: December 14, 1998Date of Patent: January 4, 2000Assignee: Mitsubishi Heavy Industries, Ltd.Inventors: Akio Kishimoto, Kenji Ueda, Zenichi Yoshida
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Patent number: 5996363Abstract: 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: GrantFiled: August 4, 1997Date of Patent: December 7, 1999Assignee: Masushita Refrigeration CompanyInventors: Masao Kurachi, Takashi Kaneko, Michiyoshi Kusaka, Kazuo Nakatani