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公开(公告)号：US20200348057A1
公开(公告)日：2020-11-05
申请号：US16764345
申请日：2018-10-09
Inventor： Koji MAETA , Shintaro OMURA
Abstract: Provided is a refrigeration machine having: a refrigeration cycle having a compressor, a condenser, an expander, an evaporator, piping (12) which sequentially connects the compressor, the condenser, the expander, and the evaporator, and discharge piping; and an acoustic device (13) provided to the piping (12). The acoustic device (13) has a space formation section (14) having a space (S) formed therein and also having an open first end (14a) which is connected to the piping (12) so as to be in communication therewith; an extendible and contractible bellows pipe (21) connected to an open second end of the space formation section (14); and a sealing section (20) provided to the end of the bellows pipe (21), which is located on the opposite side thereof from the space formation section (14).
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公开(公告)号：US20220136744A1
公开(公告)日：2022-05-05
申请号：US17523239
申请日：2021-11-10
Inventor： YASUSHI HASEGAWA , Kenji UEDA , Noriyuki MATSUKURA , Ryosuke SUEMITSU , Shintaro OMURA
IPC: F25B31/00 , F04D29/058 , F04D25/06 , F04D17/12 , F04D29/056 , F04D29/58 , F16C37/00 , F16C33/04 , F16C33/10 , F25B1/053 , F04D17/10 , F04D25/02 , F04D29/053 , F04D29/063 , F04D29/28 , F25B31/02 , F25B43/00
Abstract: A turbo chiller that has an oil-free configuration, which reduces the frequency of maintenance and maintenance-induced release of refrigerant, and can achieve a reduced environmental impact by utilizing the characteristics of the low-pressure refrigerant R1233zd(E) that reaches negative pressure at a saturation temperature of 18° C. or lower. The turbo chiller comprises a refrigeration cycle that includes a turbo compressor, a condenser, a decompression device, and an evaporator connected in sequence via piping and is filled with a refrigerant; wherein the refrigerant is a low-pressure refrigerant R1233zd(E) refrigerant with low global warming potential and low ozone depletion potential; the turbo compressor has a direct drive configuration in which a rotating shaft of impellers is directly joined to a motor; and the rotating shaft is supported by magnetic bearings.
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公开(公告)号：US20190211834A1
公开(公告)日：2019-07-11
申请号：US16095112
申请日：2017-04-18
Inventor： Yasushi HASEGAWA , Shintaro OMURA
IPC: F04D29/063 , F04D17/10 , F04D25/06 , F04D29/059 , F25B1/053 , F25B31/00
CPC classification number: F04D29/063 , F04D17/10 , F04D25/06 , F04D29/056 , F04D29/058 , F04D29/059 , F04D29/58 , F25B1/053 , F25B31/002
Abstract: To realize a reduction in cost and extension of the lifespan of a auxiliary bearing which is disposed adjacent to a non-contact bearing supporting a rotor shaft of a centrifugal compressor. A centrifugal compressor (2) includes: a rotor shaft (15); an electric motor (14) provided at an intermediate portion of the rotor shaft (15) in a coaxial manner with the rotor shaft (15), the electric motor (14) being configured to rotationally drive the rotor shaft (15); an impeller (16) fixed to one end of the rotor shaft (15) and forming a refrigerant compressing unit (7) which compresses a refrigerant; main bearings (18a, 18b) formed of non-contact bearings pivotally supporting the rotor shaft (15) at a portion between the electric motor (14) and the impeller (16), and at another end of the rotor shaft (15); auxiliary bearings (19a, 19b) disposed adjacent to the main bearings (18a, 18b), the auxiliary bearings being configured to pivotally support the rotor shaft (15) in place of the main bearings (18a, 18b) in a state where functioning of the main bearings (18a, 18b) stops; and a lubricating refrigerant supply unit (25) configured to supply the refrigerant as a lubricant to an inside of the auxiliary bearings (19a, 19b) in the state where the functioning of the main bearings (18a, 18b) stops.
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Patent Agency Ranking
公开(公告)号：US20170146271A1
公开(公告)日：2017-05-25
申请号：US15322014
申请日：2015-07-27
Inventor： Yasushi HASEGAWA , Kenji UEDA , Noriyuki MATSUKURA , Ryosuke SUEMITSU , Shintaro OMURA
IPC: F25B31/00 , F04D29/28 , F04D29/053 , F04D29/058 , F25B43/00 , F04D29/063 , F04D29/58 , F25B1/053 , F25B31/02 , F04D17/10 , F04D25/02
Abstract: A turbo chiller that has an oil-free configuration, which reduces the frequency of maintenance and maintenance-induced release of refrigerant, and can achieve a reduced environmental impact by utilizing the characteristics of the low-pressure refrigerant R1233zd(E) that reaches negative pressure at a saturation temperature of 18° C. or lower. The turbo chiller comprises a refrigeration cycle that includes a turbo compressor, a condenser, a decompression device, and an evaporator connected in sequence via piping and is filled with a refrigerant; wherein the refrigerant is a low-pressure refrigerant R1233zd(E) refrigerant with low global warming potential and low ozone depletion potential; the turbo compressor has a direct drive configuration in which a rotating shaft of impellers is directly joined to a motor; and the rotating shaft is supported by magnetic bearings.
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公开(公告)号：US20210010719A1
公开(公告)日：2021-01-14
申请号：US16982934
申请日：2019-03-19
Inventor： Yasushi HASEGAWA , Kenji UEDA , Shintaro OMURA
IPC: F25B1/053 , F04D29/058 , F25B9/06
Abstract: Provided are a turbo compressor and a centrifugal chiller comprising the same with which the length of a shaft in an axial direction can be shortened, rotational shake accompanying rotation of the shaft is suppressed, and a device can be made small. A turbo compressor comprising: a compressor part which compresses refrigerant; a shaft (15) which drives the compressor part around an axis of rotation X; a magnetic bearing (30A) which has provided thereto an iron core part (32) comprising a plurality of teeth parts (34) formed at equiangular intervals around the axis of rotation X, and, a plurality of coils (36) respectively wound around the plurality of teeth parts (34), and said magnetic bearing (30A) allows the shaft (15) to pass through and supports said shaft (15) without contacting the same; an auxiliary bearing which allows the shaft (15) to pass through; and a displacement sensor (50) which detects displacement of the shaft (15), wherein the displacement sensor (50) is provided between neighboring coils (36).
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公开(公告)号：US20180252233A1
公开(公告)日：2018-09-06
申请号：US15756622
申请日：2017-01-12
Inventor： Ryosuke SUEMITSU , Yasushi HASEGAWA , Noriyuki MATSUKURA , Shintaro OMURA
IPC: F04D29/58 , F04D29/056 , F04D29/62 , F25B1/053 , F04D29/052
CPC classification number: F04D29/5806 , F04D17/122 , F04D29/052 , F04D29/056 , F04D29/057 , F04D29/059 , F04D29/62 , F16C17/02 , F16C17/22 , F16C19/163 , F16C21/00 , F16C33/103 , F16C33/1045 , F16C35/10 , F16C35/12 , F16C2360/44 , F25B1/053
Abstract: The object of the present invention is to suppress a mechanical loss caused by thermal elongation or rotational vibration of a rotary shaft of a turbo compressor for compressing a low pressure refrigerant used at a maximum pressure of less than 0.2 MPaG so as to enhance the efficiency of a turbo chilling apparatus. The turbo compressor is a turbo compressor for compressing a low pressure refrigerant used at a maximum pressure of less than 0.2 MPaG, the turbo compressor including: a rotary shaft; an electric motor coaxially disposed on an intermediate portion of the rotary shaft so a to rotationally drive the rotary shat impellers fixed to one end of the rotary shaft and forming a compression portion; a first bearing pivotally sporting the rotary shaft between the electric motor and the impellers; and a second bearing pivotally supporting the other end of the rotary shaft, wherein the first bearing is formed of a rolling bearing, and the second bearing is formed of a sliding bearing.
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公开(公告)号：US20180094626A1
公开(公告)日：2018-04-05
申请号：US15559248
申请日：2016-03-08
Inventor： Naoki KOBAYASHI , Kenji UEDA , Yasushi HASEGAWA , Noriyuki MATSUKURA , Shintaro OMURA
CPC classification number: F04B39/062 , F04B35/04 , F04B39/00 , F04B39/06 , F04D27/0215 , F04D29/284 , F04D29/5806 , F04D29/5846 , F25B1/053 , F25B31/008 , H02K9/19
Abstract: A compressor driving motor includes: a rotor; a stator surrounding an outer peripheral part of the rotor; a case accommodating the rotor and the stator; a liquid introduction portion introducing a liquid refrigerant from a refrigerant circuit including the compressor into the case; a gas introduction portion introducing a gas refrigerant from the refrigerant circuit into the case; and an injector using, as driving fluid, the gas refrigerant introduced by the gas introduction portion, and using, as suction fluid, the liquid refrigerant introduced by the liquid introduction portion. Wet steam of a mixture of the liquid refrigerant and the gas refrigerant mixed by the injector is injected toward at least a gap between the outer peripheral part of the rotor and an inner peripheral part of the stator.
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公开(公告)号：US20180073521A1
公开(公告)日：2018-03-15
申请号：US15559169
申请日：2016-03-03
Inventor： Naoki KOBAYASHI , Kenji UEDA , Yasushi HASEGAWA , Noriyuki MATSUKURA , Shintaro OMURA
CPC classification number: F04D29/5806 , F04B35/04 , F04B39/00 , F04B39/06 , F04D17/10 , F04D25/06 , F04D25/0606 , F04D29/053 , F04D29/284 , F04D29/4206 , F25B1/053 , F25B13/00 , F25B31/006 , F25B31/008 , F25B31/026 , H02K1/32 , H02K9/10 , H02K9/19 , H02K9/20
Abstract: A compressor driving motor includes: a rotor; a stator surrounding an outer peripheral part of the rotor; a case accommodating the rotor and the stator; a liquid introduction path introducing a liquid refrigerant from a refrigerant circuit including a compressor; and a gas introduction path introducing a gas refrigerant from the refrigerant circuit. The case includes a downstream chamber located on one end side of the rotor and the stator in an axial direction and provided with the compressor, and an upstream chamber located on the other end side in the axial direction and communicating with the downstream chamber through a gap between the outer peripheral part of the rotor and an inner peripheral part of the stator. The introduced liquid refrigerant and the introduced gas refrigerant are mixed in the upstream chamber, and wet steam of the mixed refrigerant is supplied to at least the gap.
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