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公开(公告)号：US20180347860A1
公开(公告)日：2018-12-06
申请号：US15780844
申请日：2017-02-09
发明人： Kazuki WAJIMA , Noriyuki MATSUKURA , Kenji UEDA , Naoki KOBAYASHI , Ryosuke SUEMITSU , Yoshinori AKAMATSU , Fuyuhiko SAKYU , Kanako OSAFUNE , Masanori TAMURA , Hiroyuki SUDA , Junji MIZUKADO , Kenji TAKIZAWA , Liang CHEN , Heng-dao QUAN
摘要： An object of the present invention is to provide a heat source machine that can reduce the environmental load and can output the thermal energy with high temperature, and a method for operating the heat source machine. A heat source machine of the present invention includes a centrifugal compressor, condensers, expansion valves, and an evaporator, in which a refrigerant enclosed in a refrigerant circulation circuit configured by sequentially connecting the centrifugal compressor, the condensers, the expansion valves, and the evaporator contains a composition A, a composition B, or a composition C, the composition A has 4 or 5 carbon atoms, 6 or more fluorine atoms, and one or more oxygen atoms, the composition B has 4 or 5 carbon atoms and 6 or more fluorine atoms, the composition C has 3 carbon atoms, 2 chlorine atoms, 3 fluorine atoms, and an intramolecular double bond, and the composition A, the composition B, or the composition C has a boiling point of 20° C. or more and a critical temperature of 180° C. or more.
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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
摘要： 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：US20180252233A1
公开(公告)日：2018-09-06
申请号：US15756622
申请日：2017-01-12
IPC分类号： F04D29/58 , F04D29/056 , F04D29/62 , F25B1/053 , F04D29/052
CPC分类号： 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
摘要： 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：US20220221232A1
公开(公告)日：2022-07-14
申请号：US17612483
申请日：2019-06-06
发明人： Jun MIYAMOTO , Ryosuke SUEMITSU , Yasusi HASEGAWA , Kazuki WAZIMA
摘要： The purpose of the present invention is to provide a compact heat exchanger with which the generation of excessive pressure loss can be suppressed and a suitable flow rate can be assured in accordance with the volumetric changes of a fluid due to phase changes. This heat exchanger (1) comprises a flow path (8) which has an inlet (10) into which a fluid (6) flows and an outlet (11) through which the flowed fluid (6) flows out, and in which a phase change from a fluid phase to a gas phase occurs between the inlet (10) and the outlet (11), wherein the inside of the flow path (8) is formed in a resistance shape (12) so that the amount of flow path resistance applied to the flow of the fluid (6) is smaller on the outlet (11) side than the inlet (10) side.
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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
IPC分类号： 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
摘要： 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：US20200011578A1
公开(公告)日：2020-01-09
申请号：US16493176
申请日：2018-03-08
发明人： Ryosuke SUEMITSU , Kenji UEDA , Kazuki WAJIMA , Naoki KOBAYASHI
摘要： The objective of the present invention is to provide a refrigerant circulation device and a refrigerant circulation method with which a change in pressure inside the device can be avoided and performance stability and stable operation are achieved even when a HFO or a HCFO refrigerant is used. In the refrigerant circulation device (1), a refrigerant circulation circuit for circulating a refrigerant is formed by connecting a compressor (3), a condenser (5), an expansion valve (7), and an evaporator (9) through primary pipes (11a, 11b, 11c, 11d), and the refrigerant circulation circuit is charged with a refrigerant containing hydrofluoroolefin or hydrochlorofluoroolefin having a carbon-carbon double bond in the molecular structure. The refrigerant circulation device (1) is provided with a recovery catalyst that is arranged so as to be capable of contacting the refrigerant in the refrigerant circulation circuit, and is for returning, to the pre-isomerization state, an isomer formed by isomerization of the hydrofluoroolefin or hydrochlorofluoroolefin contained in the initial refrigerant with which the refrigerant circulation circuit is initially charged.
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公开(公告)号：US20190128580A1
公开(公告)日：2019-05-02
申请号：US16091151
申请日：2017-04-25
发明人： Ryosuke SUEMITSU , Yasushi HASEGAWA
IPC分类号： F25B43/02 , F04D29/46 , F04D27/00 , F04D29/063 , F25B1/053
摘要： 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：US20210108843A1
公开(公告)日：2021-04-15
申请号：US16498953
申请日：2018-03-08
摘要： A refrigeration machine control device according to an embodiment of the present invention serves to control a turbo refrigeration machine and is equipped with a pressure reduction rate identification unit for identifying a pressure reduction rate at which foaming does not occur in an oil tank, and a pressure adjustment unit for adjusting the pressure of an evaporator on the basis of the identified pressure reduction rate. The pressure reduction rate identification unit is equipped with: a refrigerant precipitation gas volume calculation unit for calculating the volume of refrigerant gas precipitated from lubricating oil when the pressure is reduced at a prescribed pressure reduction rate; and a determination unit for determining whether or not foaming is permissible on the basis of a comparison between the calculated volume and the volume on the surface of the oil in the oil tank.
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公开(公告)号：US20190390878A1
公开(公告)日：2019-12-26
申请号：US16489622
申请日：2018-06-28
发明人： Ryosuke SUEMITSU , Kenji UEDA , Yasushi HASEGAWA , Kazuki WAJIMA , Yoshinori AKAMATSU , Fuyuhiko SAKYU , Kanako OSAFUNE
摘要： It is an object of the present invention to provide a heat pump that can use, as a refrigerant, a substance with which a geometric isomer exists, and a method for designing the same. The present invention is a method for designing a heat pump (1) whose closed circuit configured by connecting a compressor (2), a condenser (3), an expansion valve (4), and an evaporator (5) in this order is filled with a refrigerant containing a refrigerant substance with which a geometric isomer may exist, the method including obtaining an upper limit of stable temperature at which isomerization of the refrigerant substance does not proceed, and setting an upper limit usage temperature of the heat pump (1) so as not to exceed the upper limit of the stable temperature.
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公开(公告)号：US20180066871A1
公开(公告)日：2018-03-08
申请号：US15559598
申请日：2016-03-28
发明人： Noriyuki MATSUKURA , Kenji UEDA , Naoki KOBAYASHI , Ryosuke SUEMITSU , Norihisa HORAGUCHI , Satoru OKAMOTO , Yoshio NISHIGUCHI
CPC分类号： F25B1/10 , C09K5/04 , C09K5/041 , C09K5/044 , C09K5/045 , C09K2205/126 , F04D17/12 , F25B1/053 , F25B43/003 , F25B45/00 , F25B2400/13
摘要： An object of the present invention is to provide a refrigerant circulation device and method that can suppress acid generation caused by decomposition of a refrigerant containing an HFO or HCFO. The refrigerant circulation device has a compressor, a condenser, expansion valves and an evaporator connected by a main pipe to form a refrigerant circulation circuit through which a refrigerant is circulated, the refrigerant circulation circuit being filled with a refrigerant containing a hydrofluoroolefin or a hydrochlorofluoroolefin having a carbon-carbon double bond within the molecular structure, wherein the refrigerant circulation device includes a drive that drives the compressor via a speed increaser, and a drive cooling unit that cools the drive with the refrigerant condensed in the condenser, and a desiccant that can trap moisture is disposed in the evaporator or the drive cooling unit.
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