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公开(公告)号：US20210302084A1
公开(公告)日：2021-09-30
申请号：US17266012
申请日：2019-06-18
Inventor： Ryosuke SUEMITSU , Akimasa YOKOYAMA , Takahiro KONO , Yasushi HASEGAWA
Abstract: The present invention provides a control device for detecting an abnormal operation state of a compressor in a parallel refrigerator. The control device is a control device for a refrigerator that includes a plurality of compressors connected in parallel, and detects occurrence of surging and occurrence of droplet suction on the basis of a deviation between values of currents flowing through electric motors that is configured to drive each of the plurality of compressors, and an operation point indicated by the air volume and the compression ratio of the plurality of compressors.
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公开(公告)号：US20200232682A1
公开(公告)日：2020-07-23
申请号：US16486454
申请日：2018-01-22
Inventor： Naoya MIYOSHI , Kenji UEDA , Kazuki WAJIMA , Yasushi HASEGAWA
Abstract: A centrifugal chiller includes a first expansion unit (23) that expands refrigerant that has been compressed and condensed, and an evaporation unit (41) that evaporates the expanded refrigerant and supplies the evaporated refrigerant to a compression unit (15). The first expansion unit (23) has an orifice (20) through which refrigerant condensed by a condensation unit (17) passes, and a flow rate regulation valve (22) that can regulate the amount of refrigerant condensed by the condensation unit (17) flowing through and that is connected in parallel with the orifice (20).
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公开(公告)号：US20210396397A1
公开(公告)日：2021-12-23
申请号：US16498955
申请日：2018-03-09
Inventor： Yoshie TOGANO , Takaaki MIURA , Yasushi HASEGAWA
Abstract: A refrigerating machine (1) is equipped with a condenser (3) through which a low-pressure refrigerant flows inside, an intermediate cooler (4), an evaporator (5), and a sensor of the atmosphere open type which is attached to at least one of the condenser (3), the intermediate cooler (4), and the evaporator (5) to measure the pressure inside at least one of the condenser (3), the intermediate cooler (4) and the evaporator (5), and a correcting unit which is configured to correct an atmospheric pressure which is a reference value of the sensor by acquiring the atmospheric pressure of a location in which the refrigerating machine (1) is installed.
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公开(公告)号：US20210190394A1
公开(公告)日：2021-06-24
申请号：US16754280
申请日：2018-10-12
Inventor： Yoshie TOGANO , Kenji UEDA , Yasushi HASEGAWA
Abstract: In order to reduce the effect on a compressor caused by foaming in an oil tank, a control unit for controlling an oil pump starts the oil pump before a compressor is started (SA1), starts the compressor (SA4) when an oil supply differential pressure P satisfies a compressor startup condition during a reference time Tas from the starting of the oil pump (“Yes” in SA3), and extends the operation of the oil pump for a prescribed time without starting the compressor (Step SA5) when the compressor startup condition is not satisfied (“No” in SA3).
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公开(公告)号：US20210033316A1
公开(公告)日：2021-02-04
申请号：US16767039
申请日：2018-11-16
Inventor： Yoshie TOGANO , Kenji UEDA , Yasushi HASEGAWA
IPC: F25B31/00 , F04B49/06 , F04D29/063
Abstract: In order to reduce the effect of foaming occurring in an oil tank on a compressor, an oil pump control unit (50) is applied to a turbo refrigerator comprising an oil tank that stores lubrication oil supplied to a compressor and a variable-speed oil pump that supplies the lubricating oil in the oil tank to the compressor. The oil pump control unit (50) comprises: an intake refrigerant gas amount calculation unit (52) for calculating the amount of refrigerant gas drawn into the oil pump, as an intake refrigerant gas amount; a supplied lubricating oil amount calculation unit (53) for using the intake refrigerant gas amount and a required lubricating oil amount, which is an amount of lubricating oil required by the compressor, to calculate a supplied lubricating oil amount; and a command value generation unit (54) for generating a rotation speed command value for the oil pump on the basis of the supplied lubricating oil amount.
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Patent Agency Ranking
公开(公告)号：US20190128580A1
公开(公告)日：2019-05-02
申请号：US16091151
申请日：2017-04-25
Inventor： Ryosuke SUEMITSU , Yasushi HASEGAWA
IPC: F25B43/02 , F04D29/46 , F04D27/00 , F04D29/063 , F25B1/053
Abstract: The present invention is provided with: a turbo compressor that compresses a refrigerant; a condenser that condenses the refrigerant compressed by the turbo compressor; an expansion valve that expands a liquid refrigerant introduced from the condenser; an evaporator that evaporates the refrigerant expanded by the expansion valve; an oil tank that stores a lubricating oil supplied to the turbo compressor; a pressure equalizing pipe that connects the oil tank and the evaporator; and a control unit that controls start-up. The control unit calculates the amount of a refrigerant eluded into the lubricating oil in the oil tank at the time of start-up, and reduces a pressure reduction speed in the oil tank by limiting the opening operation of an IGV when the refrigerant elution amount per prescribed time exceeds a prescribed value.
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公开(公告)号：US20200096043A1
公开(公告)日：2020-03-26
申请号：US16472102
申请日：2017-11-29
Inventor： Takeshi KANEKO , Yuichi OTANI , Jun MIYAMOTO , Yasushi HASEGAWA
Abstract: A rotary machine of the present invention is provided with: a bearing including an inner ring secured to an outer peripheral surface of a rotating element, an outer ring disposed outside the inner ring, and a plurality of rolling elements interposed between the inner ring and the outer ring; a bearing housing disposed outside the bearing and to which the outer ring is secured; a casing disposed outside the bearing housing and to which the bearing housing is secured; and a temperature difference reducer to reduce a difference between a temperatures of the outer and inner rings.
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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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公开(公告)号：US20190078811A1
公开(公告)日：2019-03-14
申请号：US16081612
申请日：2017-06-26
Inventor： Naoya MIYOSHI , Kenji UEDA , Yasushi HASEGAWA
Abstract: The purpose of the present invention is to provide a refrigerator in which the capacity of an oil tank can be made smaller than in the prior art while a foaming phenomenon is addressed. The refrigerator is provided with: a refrigeration cycle which includes a condenser, an evaporator, and an electric compressor having a compression mechanism to be driven by a motor and in which a refrigerant circulates; an oil tank in which a lubricating oil is stored; a heater which is set in the oil tank and which heats the lubricating oil; a lubricating oil supply line which is connected to the oil tank and which supplies the lubricating oil from the oil tank into a housing having the motor housed therein; a lubricating oil discharge line which returns the lubricating oil from the housing back to the oil tank; a pressure equalizing pipe which has one end connected to the oil tank and the other end connected to the refrigeration cycle; and a buffer tank which is set to the pressure equalizing pipe, which receives the refrigerant and the lubricating oil flowing out from the oil tank, and in which the lubricating oil is stored.
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公开(公告)号：US20170153049A1
公开(公告)日：2017-06-01
申请号：US15320168
申请日：2015-04-21
Inventor： Yoshiyuki KONDO , Takuo ODA , Yasushi HASEGAWA , Naoya MIYOSHI
CPC classification number: F25B39/00 , F25B25/005 , F25B39/02 , F25B39/028 , F25B2339/0242 , F28D1/0213 , F28D7/1607 , F28D7/163 , F28D2021/0071 , F28F9/005 , F28F9/0131 , F28F9/22 , F28F13/003 , F28F2009/226 , F28F2210/08
Abstract: An evaporator includes: a vessel having a refrigerant inlet for receiving a refrigerant at a lower part of the vessel, and a refrigerant outlet for discharging the refrigerant in an evaporated state at an upper part of the vessel; and a plurality of heat-transfer tubes disposed so as to extend inside the vessel along a longitudinal direction of the vessel, and configured to transfer heat received from a fluid flowing inside the heat-transfer tubes to the refrigerant flowing outside the heat-transfer tubes. The plurality of heat-transfer tubes are disposed so that at least one downward flow passage is defined through the plurality of heat-transfer tubes or around the plurality of heat-transfer tubes, the at least one downward flow passage having a width larger than a representative interval between the plurality of heat-transfer tubes. A representative interval between the plurality of heat-transfer tubes disposed on an upper side among the plurality of heat-transfer tubes is larger than a representative interval between the plurality of heat-transfer tubes disposed on a lower side among the plurality of heat-transfer tubes.
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