-
公开(公告)号：US12123629B2
公开(公告)日：2024-10-22
申请号：US18371553
申请日：2023-09-22
发明人： Masaaki Takegami , Naoto Kimura , Masahiko Kaneda
CPC分类号： F25B1/10 , F25B13/00 , F25B41/26 , F25B49/022 , F25B2400/075 , F25B2600/025 , F25B2600/0251 , F25B2600/2501
摘要： A heat source unit connected to a utilization-side unit and configured to perform a refrigeration cycle includes a low-stage compressor, a high-stage compressor, a four-way switching valve, a low-stage pipe, and a controller. The low-stage pipe is provided in parallel with the low-stage compressor, and the refrigerant flows therethrough while the low-stage compressor is stopped. The controller outputs an instruction signal for actuating the four-way switching valve, to the four-way switching valve while the low-stage compressor is stopped and the high-stage compressor is operating.
-
公开(公告)号：US12031752B2
公开(公告)日：2024-07-09
申请号：US17557713
申请日：2021-12-21
IPC分类号： F25B1/10
CPC分类号： F25B1/10 , F25B2309/061 , F25B2400/13
摘要： A refrigeration apparatus is of a two-stage compression type for compressing a refrigerant to a supercritical region. The refrigeration apparatus includes a lower stage-side compression unit, a higher stage-side compression unit, an intermediate cooler, a heat source-side heat exchanger, a utilization-side heat exchanger, an economizer circuit, and a control unit. During a first operation in which the heat source-side heat exchanger functions as a radiator and the utilization-side heat exchanger functions as an evaporator, in a case where a discharge temperature which is a temperature of the refrigerant discharged from the higher stage-side compression unit is more than a first temperature, the control unit increases a cooling capacity of the intermediate cooler without increasing a refrigerant flow rate of the economizer circuit on condition that the intermediate cooler does not reach a maximum cooling capacity.
-
3.发明授权公开(公告)号：US11788781B2
公开(公告)日：2023-10-17
申请号：US18137006
申请日：2023-04-20
发明人： Shuichi Taguchi , Masaaki Takegami
CPC分类号： F25B49/022 , F25B9/008 , F25B2309/061 , F25B2313/0233 , F25B2313/0313 , F25B2500/23 , F25B2500/24 , F25B2600/0251 , F25B2600/05 , F25B2600/2523 , F25B2700/04 , F25B2700/195
摘要： A refrigeration apparatus (1) includes a heat-source-side unit (10) using a refrigerant that works in a supercritical region. The heat-source-side unit (10) includes a compression element (20) configured to compress the refrigerant, a heat-source-side heat exchanger (24), an expansion valve (26) provided downstream of the heat-source-side heat exchanger (24), a receiver (25) provided downstream of the expansion valve (26), and a control unit (101). The control unit (101) performs a first operation for evaluating the amount of the refrigerant based on a high-pressure-side pressure, on a first condition that the internal pressure of the receiver (25) be equal to or less than a supercritical pressure.
-
公开(公告)号：US11512876B2
公开(公告)日：2022-11-29
申请号：US17684720
申请日：2022-03-02
发明人： Masaaki Takegami , Shuichi Taguchi
摘要： A refrigeration apparatus includes a heat source-side unit and a utilization-side unit that are connected to each other, and performs a refrigeration cycle in which a high pressure of a refrigerant reaches or exceeds a critical pressure. The refrigeration apparatus also includes a control unit configured to perform a first action of returning the refrigerant to the heat source-side unit when a stop condition of the utilization-side unit is satisfied, and a second action of prohibiting the first action when a pressure at the heat source-side unit is equal to or more than the critical pressure of the refrigerant. This configuration suppresses damage to a refrigerant storage reservoir and the like in returning the refrigerant to the heat source-side unit.
-
公开(公告)号：US11448433B2
公开(公告)日：2022-09-20
申请号：US17572285
申请日：2022-01-10
摘要： A refrigerant circuit of a refrigeration apparatus performs a refrigeration cycle in which a high pressure is equal to or greater than the critical pressure of a refrigerant. The refrigeration apparatus performs at least a heat application operation in which an indoor heat exchanger of the refrigerant circuit functions as a radiator. A controller of the refrigeration apparatus controls the opening degree of the indoor expansion valve of the refrigerant circuit so that the temperature of the refrigerant at the outlet of the indoor heat exchanger reaches a predetermined reference temperature, in the heat application operation.
-
公开(公告)号：US12085320B2
公开(公告)日：2024-09-10
申请号：US18375151
申请日：2023-09-29
发明人： Masaaki Takegami , Akitoshi Ueno , Naoto Kimura
CPC分类号： F25B49/02 , F25B1/04 , F25B40/02 , F25B40/06 , F25B2600/2513
摘要： A heat source unit connected to a utilization unit includes a compressor, a first heat exchanger, a first expansion valve, and a receiver. The heat source unit further includes a first cooler and a second cooler. The first cooler cools a primary refrigerant flowing from the receiver toward the utilization unit. The second cooler cools the primary refrigerant flowing from the first heat exchanger functioning as a radiator toward the first expansion valve, using a coolant other than outdoor air.
-
公开(公告)号：US11428225B2
公开(公告)日：2022-08-30
申请号：US17277687
申请日：2019-09-25
发明人： Daisuke Okamoto , Mikio Kajiwara , Yohei Nishide , Naoto Tomioka , Masaaki Adachi , Yousuke Ohnishi , Akitoshi Ueno , Takuya Horita , Masaaki Takegami
摘要： A multistage compression system uses refrigerant and oil. The multistage compression system includes a low-stage compressor that compresses the refrigerant, a high-stage compressor that further compresses the refrigerant compressed by the low-stage compressor, an oil return pipe that returns the oil discharged by the high-stage compressor to the low-stage compressor, and an oil discharge pipe that discharges the oil in the low-stage compressor. The low-stage compressor includes a compression part that compresses the refrigerant, a motor that drives the compression part, and a container that houses the compression part and the motor. The container forms a high-pressure space storing compressed refrigerant. Inside of the oil return pipe and inside of the oil discharge pipe are connected to the high-pressure space.
-
公开(公告)号：US11415342B2
公开(公告)日：2022-08-16
申请号：US17280089
申请日：2019-09-25
发明人： Yousuke Ohnishi , Masaaki Adachi , Mikio Kajiwara , Yohei Nishide , Naoto Tomioka , Daisuke Okamoto , Akitoshi Ueno , Takuya Horita , Masaaki Takegami
IPC分类号： F25B1/10 , F04C23/00 , F04C29/02 , F04C29/04 , F25B13/00 , F25B40/00 , F04D25/16 , F04C18/356 , F04D29/58 , F04D17/12 , F25B9/00 , F25B31/00
摘要： A multistage compression system uses refrigerant and oil. The multistage compression system includes a low-stage compressor that compresses the refrigerant, a high-stage compressor that further compresses the refrigerant compressed by the low-stage compressor, refrigerant pipes that introduce the refrigerant compressed and discharged by the low-stage compressor into a suction part of the high-stage compressor, an intercooler, and an oil discharge pipe. The intercooler cools the refrigerant discharged by the low-stage compressor before the refrigerant is sucked into the high-stage compressor. The intercooler is disposed between the refrigerant pipes. The oil discharge pipe discharges the oil in the low-stage compressor. The oil discharge pipe connects the low-stage compressor and a portion of the refrigerant pipes. The portion of the refrigerant pipes is on an upstream side of the intercooler.
-
公开(公告)号：US11598559B2
公开(公告)日：2023-03-07
申请号：US17684109
申请日：2022-03-01
发明人： Masaaki Takegami , Shuichi Taguchi
摘要： A heat source-side unit (10) includes a heat source-side circuit (11). The heat source-side circuit (11) includes a compression unit (20) including a lower-stage compression element (23) and a higher-stage compression element (21), an intermediate heat exchanger (17) disposed on a refrigerant path between the lower-stage compression element (23) and the higher-stage compression element (21), and a bypass passage (23c) connected to a suction pipe (23a) and a discharge pipe (23b) each connected to the lower-stage compression element (23). At startup of the compression unit (20), a first action is performed for stopping the lower-stage compression element (23) and operating the higher-stage compression element (21). This configuration thus suppresses occurrence of liquid compression at startup of a compressor.
-
公开(公告)号：US11486616B2
公开(公告)日：2022-11-01
申请号：US17037221
申请日：2020-09-29
发明人： Masaaki Takegami , Takuya Horita , Akitoshi Ueno
摘要： A flow path switching mechanism (70) includes first to fourth flow paths (71, 72, 73, 74) and opening and closing mechanisms (V1, V2, V3, V4, 75, 76) that can each open and close a corresponding one of the flow paths (71, 72, 73, 74). A first connection point (C1) connecting an inflow portion of the first flow path (71) and an inflow portion of the second flow path (72) is connected to a discharge portion of a compression unit (30). A second connection point (C2) connecting an outflow portion of the first flow path (71) and an inflow portion of the third flow path (73) is connected to a gas-side end of a heat source heat exchanger (22). A third connection point (C3) connecting an outflow portion of the second flow path (72) and an inflow portion of the fourth flow path (74) is connected to a gas-side end of a second utilization heat exchanger (85, 93). A fourth connection point (C4) connecting an outflow portion of the third flow path (73) and an outflow portion of the fourth flow path (74), and a gas-side end of a first utilization heat exchanger (83) are connected to a suction portion of the compression unit (30).
-
-
-
-
-
-
-
-
-
搜索结果
16 条记录 (耗时 0.022 秒)
