WO2023228765A1 - 二相冷却システム用循環装置および二相冷却システム用循環装置における冷媒循環方法 - Google Patents

二相冷却システム用循環装置および二相冷却システム用循環装置における冷媒循環方法 Download PDF

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Publication number
WO2023228765A1
WO2023228765A1 PCT/JP2023/017737 JP2023017737W WO2023228765A1 WO 2023228765 A1 WO2023228765 A1 WO 2023228765A1 JP 2023017737 W JP2023017737 W JP 2023017737W WO 2023228765 A1 WO2023228765 A1 WO 2023228765A1
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WO
WIPO (PCT)
Prior art keywords
refrigerant
evaporator
side connection
flow path
connection part
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2023/017737
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English (en)
French (fr)
Japanese (ja)
Inventor
翔太朗 松田
峻介 関本
将之 山本
和史 乙野
勲 野内
幸雄 堀口
嘉晃 西浦
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Shimadzu Corp
Original Assignee
Shimadzu Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Shimadzu Corp filed Critical Shimadzu Corp
Priority to CN202380042883.XA priority Critical patent/CN119278349A/zh
Priority to KR1020247039756A priority patent/KR20250004027A/ko
Priority to EP23811640.4A priority patent/EP4534941A1/en
Priority to JP2024523033A priority patent/JP7831594B2/ja
Publication of WO2023228765A1 publication Critical patent/WO2023228765A1/ja
Priority to US18/961,310 priority patent/US20250093079A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B13/00—Compression machines, plants or systems, with reversible cycle
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D15/00—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies
    • F28D15/02—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies in which the medium condenses and evaporates, e.g. heat pipes
    • F28D15/06—Control arrangements therefor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B23/00—Machines, plants or systems, with a single mode of operation not covered by groups F25B1/00 - F25B21/00, e.g. using selective radiation effect
    • F25B23/006—Machines, plants or systems, with a single mode of operation not covered by groups F25B1/00 - F25B21/00, e.g. using selective radiation effect boiling cooling systems
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B25/00—Machines, plants or systems, using a combination of modes of operation covered by two or more of the groups F25B1/00 - F25B23/00
    • F25B25/005—Machines, plants or systems, using a combination of modes of operation covered by two or more of the groups F25B1/00 - F25B23/00 using primary and secondary systems
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B39/00—Evaporators; Condensers
    • F25B39/02—Evaporators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B39/00—Evaporators; Condensers
    • F25B39/04—Condensers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B41/00—Fluid-circulation arrangements
    • F25B41/20—Disposition of valves, e.g. of on-off valves or flow control valves
    • F25B41/24—Arrangement of shut-off valves for disconnecting a part of the refrigerant cycle, e.g. an outdoor part
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B49/00—Arrangement or mounting of control or safety devices
    • F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D15/00—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies
    • F28D15/02—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies in which the medium condenses and evaporates, e.g. heat pipes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D15/00—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies
    • F28D15/02—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies in which the medium condenses and evaporates, e.g. heat pipes
    • F28D15/0266—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies in which the medium condenses and evaporates, e.g. heat pipes with separate evaporating and condensing chambers connected by at least one conduit; Loop-type heat pipes; with multiple or common evaporating or condensing chambers
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K7/00—Constructional details common to different types of electric apparatus
    • H05K7/20—Modifications to facilitate cooling, ventilating, or heating
    • H05K7/2029—Modifications to facilitate cooling, ventilating, or heating using a liquid coolant with phase change in electronic enclosures
    • H05K7/20327—Accessories for moving fluid, for connecting fluid conduits, for distributing fluid or for preventing leakage, e.g. pumps, tanks or manifolds
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K7/00—Constructional details common to different types of electric apparatus
    • H05K7/20—Modifications to facilitate cooling, ventilating, or heating
    • H05K7/2029—Modifications to facilitate cooling, ventilating, or heating using a liquid coolant with phase change in electronic enclosures
    • H05K7/20336—Heat pipes, e.g. wicks or capillary pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2339/00—Details of evaporators; Details of condensers
    • F25B2339/02—Details of evaporators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2400/00—Component parts or details not otherwise provided for in this subclass
    • F25B2400/04—Refrigeration circuit bypassing means
    • F25B2400/0409—Refrigeration circuit bypassing means for evaporators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2600/00—Control issues
    • F25B2600/25—Control of valves
    • F25B2600/2501—Bypass valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2600/00—Control issues
    • F25B2600/25—Control of valves
    • F25B2600/2519—On-off valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2700/00—Sensing or detecting of parameters; Sensors therefor
    • F25B2700/04—Refrigerant level

Definitions

  • the present invention relates to a two-phase cooling system circulation device and a refrigerant circulation method in the two-phase cooling system circulation device.
  • the present invention relates to a refrigerant circulation method in a circulation device for a cooling system and a circulation device for a two-phase cooling system.
  • two-phase cooling systems are known in which a refrigerant is circulated by connecting a detachable evaporator to a connection part.
  • a circulation device for a two-phase cooling system is disclosed in, for example, Japanese Patent Laid-Open No. 2003-179375.
  • Japanese Unexamined Patent Publication No. 2003-179375 discloses a cooling device (two-phase cooling system) that includes a plurality of cooling modules that can be selectively attached to an electronic equipment cabinet.
  • Each of the cooling modules includes an evaporative cold plate having an evaporation flow path, a condenser having a condensation flow path, a vapor line, and a liquid line.
  • the working fluid flowing through the cooling module flows through the evaporation channel, the vapor line, the condensation channel, and the liquid line in this order, thereby forming a pressure-feeding two-phase cooling cycle.
  • 2003-179375 discloses that the connecting portion between the evaporative cold plate inlet and the liquid pipe line, and the connecting portion between the evaporative cold plate outlet and the steam pipe line are connected by removable connecting means. It is disclosed that it is advantageous to be present. That is, Japanese Patent Laid-Open No. 2003-179375 discloses a cooling device in which an evaporative cold plate (evaporator) is configured to be detachable from a structure including a condenser, a vapor pipe line, and a liquid pipe line. There is.
  • the working fluid circulates through the evaporative cold plate, the vapor line, the condenser, and the liquid line.
  • the working fluid cannot be circulated.
  • the working fluid does not flow into the condenser, so if the working fluid is circulated at a temperature much lower than the outside air temperature, the temperature of the working fluid will rise due to the heat input from the temperature outside the cooling device. I will do it.
  • a circulation device for a two-phase cooling system and a refrigerant circulation method in the circulation device for a two-phase cooling system that can flow a low-temperature refrigerant into an evaporator and immediately cool an object to be cooled by the evaporator. It is to provide.
  • a circulation device for a two-phase cooling system configures a two-phase cooling system that circulates a refrigerant by connecting a detachable evaporator, and includes a pump for feeding the refrigerant and a downstream side of the pump.
  • an inlet-side connection part provided on the side and connected to the refrigerant inlet of the evaporator; an outlet-side connection part connected to the refrigerant outlet; and a condenser provided downstream of the outlet-side connection part to cool the refrigerant.
  • a bypass flow path that branches downstream of the pump and upstream of the inlet side connection and allows the refrigerant to flow to the condenser without going through the inlet side connection and the outlet side connection.
  • a refrigerant circulation method in a two-phase cooling system circulation device is a refrigerant circulation method in a two-phase cooling system circulation device that configures a two-phase cooling system in which a refrigerant is circulated by connecting a detachable evaporator.
  • a refrigerant circulation method wherein at least the evaporator is not connected to an inlet side connection part connected to a refrigerant inlet of the evaporator and an outlet side connection part connected to a refrigerant outlet of the evaporator. and a step of circulating the refrigerant through a bypass channel in which the refrigerant flows without passing through the outlet side connection part, and a step of cooling the refrigerant flowing through the bypass channel and flowing into the condenser.
  • the circulation device for a two-phase cooling system branches downstream of the pump and upstream of the inlet-side connection, and connects the inlet-side connection and the outlet-side connection.
  • a bypass flow path is provided that allows refrigerant to flow to the condenser without passing through the inlet side connection part and the outlet side connection part, at least in a state where the evaporator is not connected to the inlet side connection part and the outlet side connection part. , and circulate the refrigerant through the bypass flow path.
  • the refrigerant can be circulated through the bypass flow path, allowing the condenser to continue supplying the refrigerant. It can be cooled down. Therefore, even immediately after the removable evaporator is removed from the inlet-side connection and outlet-side connection and then reconnected, the cooled, low-temperature refrigerant can flow into the evaporator, and the evaporator can The object to be cooled can be immediately cooled by the device.
  • At least the evaporator is connected to the inlet side connection part connected to the refrigerant inlet of the evaporator and the refrigerant outlet.
  • the refrigerant can be circulated through the bypass flow path.
  • the refrigerant can be continuously cooled by the condenser. Therefore, even immediately after the removable evaporator is removed from the inlet-side connection and outlet-side connection and then reconnected, the cooled, low-temperature refrigerant can flow into the evaporator, and the evaporator can The object to be cooled can be immediately cooled by the device.
  • FIG. 2 is a schematic diagram showing the configuration of a two-phase cooling system circulation device with an evaporator connected according to the first embodiment.
  • FIG. 2 is a schematic diagram showing the configuration of a circulation device for a two-phase cooling system in a state where an evaporator is not connected according to the first embodiment.
  • FIG. 2 is a schematic diagram showing the configuration of a circulation device for a two-phase cooling system according to a first modification of the first embodiment.
  • FIG. 2 is a schematic diagram showing the configuration of a circulation device for a two-phase cooling system according to a second modification of the first embodiment.
  • FIG. 2 is a schematic diagram showing the configuration of a two-phase cooling system circulation device in a refrigerant recovery state according to a second embodiment.
  • FIG. 2 is a block diagram showing a control configuration of a circulation device for a two-phase cooling system according to a second embodiment. It is a graph for explaining a set liquid level according to a second embodiment. It is a flow chart for explaining refrigerant recovery processing by a control part by a 2nd embodiment. It is a graph for explaining the setting change amount by the 3rd modification. It is a block diagram which shows the control structure of the circulation device for two-phase cooling systems by the 4th modification. It is a schematic diagram which showed the example of the notification by a display part by a 4th modification. It is a schematic diagram which showed the structure of the circulation device for two-phase cooling systems by the 5th modification.
  • FIG. 1 shows a circulation device 100 for a two-phase cooling system with a removable evaporator 80 connected thereto.
  • the circulation device 100 for a two-phase cooling system configures a two-phase cooling system 200 that circulates a refrigerant by connecting a detachable evaporator 80.
  • the state in which the detachable evaporator 80 is connected is, for example, a normal operating state in which the evaporator 80 is attached to the two-phase cooling system circulation device 100 and cools the heat source 81 (to be cooled).
  • the two-phase cooling system circulation device 100 of the first embodiment is a portable circulation device.
  • detachable means that the evaporator 80 directly attached to the two-phase cooling system circulation device 100 can be removed from the two-phase cooling system circulation device 100, or the same evaporator 80 as the removed evaporator 80 or This means that other evaporators can be directly attached.
  • two-phase cooling refers to cooling using a gas-liquid mixed fluid that utilizes the heat of vaporization when a liquid changes to a gas.
  • liquid phase refrigerant 1 is represented by diagonal lines (hatching) from the upper right to the lower left
  • gas-liquid mixed refrigerant 2 is represented by the diagonal lines (hatching) from the upper left to the lower right.
  • the refrigerant is moving in the direction indicated by the arrow in the two-phase cooling system circulation device 100.
  • the “inlet side” in the inlet-side connection portion 41 refers to the inlet side of the evaporator 80
  • the “outlet side” in the outlet-side connection portion 42 refers to the outlet side of the evaporator 80
  • the “inlet side” of the inlet-side on-off valve 51 refers to the inlet side of the evaporator 80
  • the “outlet side” of the outlet-side on-off valve 52 refers to the outlet side of the evaporator 80 .
  • the first refrigerant flow path 71 has one end connected to the outlet of the pump 10 and the other end connected to the inlet side connection part 41.
  • a branch portion 76 is formed between one end and the other end of the first refrigerant flow path 71 .
  • the second refrigerant flow path 72 has one end connected to the outlet side connection part 42 and the other end connected to the inlet of the condenser 20.
  • a merging portion 77 is formed between one end and the other end of the second refrigerant flow path 72 .
  • the third refrigerant flow path 73 has one end connected to the outlet of the condenser 20 and the other end connected to the inlet of the storage section 30.
  • the fourth refrigerant flow path 74 has one end connected to the outlet of the storage section 30 and the other end connected to the inlet of the pump 10.
  • the bypass flow path 75 is branched from the first refrigerant flow path 71 to the second refrigerant flow path downstream of the pump 10 and upstream of the inlet side connection part 41 in the first refrigerant flow path 71, and is connected to the inlet side connection.
  • the refrigerant is configured to flow into the condenser 20 without passing through the section 41 and the outlet side connection section 42.
  • a bypass flow path 75 branched from the first refrigerant flow path 71 is connected to the second refrigerant flow path 72 on the downstream side of the outlet side connection part 42 and on the upstream side of the condenser 20 .
  • the bypass flow path 75 has one end connected to a branch portion 76 formed in the first refrigerant flow path 71 and the other end connected to a confluence portion 77 formed in the second refrigerant flow path 72. ing.
  • the coolant flow path 70 is formed of a metal material.
  • the coolant flow path 70 is made of, for example, stainless steel, aluminum, or copper.
  • the coolant flow path 70 is formed into a pipe shape.
  • the pump 10 is configured to pump the refrigerant 1 in a liquid phase.
  • the pump 10 is operated with an output within a predetermined range.
  • Pump 10 is configured to send refrigerant to evaporator 80 via first refrigerant flow path 71 .
  • the pump 10 is configured to send refrigerant to the condenser 20 via the first refrigerant flow path 71, the bypass flow path 75, and the second refrigerant flow path 72.
  • a refrigerant flows into the pump 10 from the storage section 30 via the fourth refrigerant flow path 74 .
  • the pump 10 is provided downstream of the storage section 30 in the fourth refrigerant flow path 74 and upstream of the evaporator 80 in the first refrigerant flow path 71 .
  • the upstream side of the pump 10 refers to a portion upstream of the pump 10 and does not include the pump 10.
  • downstream side of the pump 10 refers to a portion downstream of the pump 10, and does not include the pump 10. The same applies to the upstream and downstream sides of the condenser 20, the upstream and downstream sides of the storage section 30, and the upstream and downstream sides of the evaporator 80.
  • the pump 10 takes in the liquid phase refrigerant 1 from the inlet of the pump 10 and discharges the liquid phase refrigerant 1 from the outlet of the pump 10.
  • Pump 10 is a centrifugal pump.
  • pump 10 is not limited to a centrifugal pump.
  • the pump 10 may be a mixed flow pump, an axial flow pump, or another known pump. Alternatively, a positive displacement pump may be used.
  • the condenser 20 is configured to condense the gas-phase refrigerant in the gas-liquid mixed refrigerant 2 flowing out from the evaporator 80 to generate the liquid-phase refrigerant 1 when the evaporator 80 is connected. .
  • the condenser 20 is configured to cool and condense the refrigerant by exchanging heat with the cooling liquid 23 flowing in from the outside.
  • the condenser 20 condenses the refrigerant by, for example, absorbing the heat of the refrigerant into a cooling liquid 23 that flows into the condenser 20 from a chiller (not shown) provided outside.
  • the condenser 20 includes a flow path 21 through which a refrigerant flows, and a coolant flow path 22 through which a cooling liquid 23 flows.
  • the condenser 20 allows the gas-liquid mixed refrigerant 2 to flow in from the inlet of the condenser 20, and causes the liquid phase refrigerant 1 to flow out from the outlet of the condenser 20.
  • the condenser 20 is provided on the downstream side of the outlet side connection part 42 in the second refrigerant flow path 72. Refrigerant is introduced into the condenser 20 via the second refrigerant flow path 72 . The refrigerant condensed by the condenser 20 flows into the storage section 30 via the third refrigerant flow path 73.
  • a coolant having a lower temperature than the liquid-phase coolant 1 is used.
  • carbon dioxide is used as the refrigerant
  • a liquid containing hydrofluoroether as a main component is used as the cooling liquid 23.
  • the type of cooling liquid 23 is selected depending on the type of refrigerant.
  • the cooling liquid 23 is not particularly limited as long as it is a known cooling liquid.
  • the storage section 30 is configured to store the liquid phase refrigerant 1. In addition, when there is a gas-liquid mixed refrigerant 2 that has not been completely condensed in the condenser 20, the storage section 30 separates the bubbles (gas-phase refrigerant) contained in the gas-liquid mixed refrigerant 2 and stores it in the upper part. configured to store.
  • the storage section 30 is provided downstream of the condenser 20 in the third refrigerant flow path 73 .
  • the storage section 30 allows the liquid phase refrigerant 1 to flow in from the inlet of the storage section 30 and causes the liquid phase refrigerant 1 to flow out from the outlet of the storage section 30 . Further, the storage section 30 is configured to send the liquid phase refrigerant 1 to the pump 10 via the fourth refrigerant flow path 74.
  • the inlet side connection part 41 is configured to connect the first refrigerant flow path 71 and the refrigerant inlet of the evaporator 80.
  • the inlet side connection part 41 connects the other end of the first refrigerant flow path 71 and a refrigerant inlet provided in the evaporator 80 .
  • the inlet side connection part 41 is, for example, a joint member that can be attached to and detached from an inlet side joint member 84 formed at the refrigerant inlet of the evaporator 80 .
  • a known joint such as a threaded joint, a flange joint, a quick joint, or a bite joint is used, for example.
  • the inlet side connection part 41 is provided on the downstream side of the pump 10.
  • the outlet side connection part 42 is configured to connect the refrigerant outlet in the evaporator 80 and the second refrigerant flow path 72.
  • the outlet side connecting portion 42 connects the refrigerant outlet provided in the evaporator 80 and one end of the second refrigerant flow path 72 .
  • the outlet side connection part 42 is, for example, a joint member that is detachable from an outlet side joint member 85 formed at the refrigerant outlet of the evaporator 80 .
  • a known joint such as a threaded joint, a flange joint, a quick joint, or a bite joint is used, for example.
  • the outlet side connection part 42 is provided downstream of the pump 10 and the evaporator 80 and upstream of the condenser 20.
  • the inlet side opening/closing valve 51 is provided between the branch part 76 provided in the first refrigerant flow path 71 and the inlet side connection part 41. That is, the inlet-side opening/closing valve 51 is provided between the inlet-side connecting portion 41 and the branching portion of the first refrigerant flow path where the bypass flow path 75 is branched from the first refrigerant flow path 71 on the downstream side of the pump 10. It is being The inlet side on-off valve 51 is configured to be able to open and close the flow path.
  • the inlet side on-off valve 51 is, for example, an on-off valve that can switch the flow path between a fully open state and a fully closed state. Note that the inlet side opening/closing valve 51 may be provided integrally with the inlet side connecting portion 41. Furthermore, the inlet-side opening/closing valve 51 may be provided at the branch portion 76.
  • the outlet side opening/closing valve 52 is provided between the outlet side connecting portion 42 and the merging portion 77 provided in the second refrigerant flow path 72. That is, the outlet-side opening/closing valve 52 is provided between the outlet-side connecting portion 42 and a connecting portion to which the bypass flow path 75 is connected downstream of the outlet-side connecting portion 42 in the second refrigerant flow path.
  • the outlet side opening/closing valve 52 is configured to be able to open and close the flow path.
  • the outlet side on-off valve 52 is, for example, an on-off valve that can switch the flow path between a fully open state and a fully closed state. Note that the outlet side opening/closing valve 52 may be provided integrally with the outlet side connecting portion 42. Further, the outlet side opening/closing valve 52 may be provided at the confluence section 77.
  • the flow rate adjustment section 60 is provided in the bypass channel 75.
  • the flow rate adjustment unit 60 is configured to increase the pressure loss of the bypass flow path 75 by reducing the cross-sectional area of a portion of the bypass flow path 75.
  • the flow rate adjustment section 60 is an orifice 61.
  • the hole diameter of the orifice 61 is preset in order to adjust the distribution of the refrigerant flow rate flowing into the evaporator 80 and the refrigerant flow rate flowing into the bypass channel 75 when the evaporator 80 is connected.
  • the hole diameter of the orifice 61 is set so that the flow rate of refrigerant flowing into the evaporator 80 is greater than the flow rate of refrigerant flowing into the bypass channel 75.
  • an evaporator 80 is connected to the inlet side connection part 41 and the outlet side connection part 42.
  • the evaporator 80 cools the heat source 81 by using the heat of vaporization when a part of the liquid phase refrigerant 1 sent through the inlet side connection part 41 is evaporated and changed into a gas-liquid mixed refrigerant 2. do.
  • Evaporator 80 includes a cold plate 82 and a refrigerant flow path 83 provided inside cold plate 82 .
  • the inlet side connection part 41 is connected to the refrigerant inlet of the refrigerant flow path 83, and the outlet side connection part 42 is connected to the refrigerant outlet.
  • a heat source 81 is installed on one surface of the cold plate 82.
  • Evaporator 80 and heat source 81 are integrally formed.
  • the refrigerant flow path 83 shown in FIG. 1 is schematic.
  • the refrigerant flow path 83 may have a structure that is bent multiple times inside the evaporator 80 in order to efficiently exchange heat. Further, the refrigerant flow path 83 may be formed so as to be divided into a plurality of parts at the inlet, pass through the inside of the evaporator 80, and merge into one at the outlet. Note that the structure of the evaporator 80 is not particularly limited.
  • the refrigerant is carbon dioxide.
  • the type of refrigerant is not limited to this.
  • the refrigerant may be, for example, fluorocarbon or ammonia.
  • FIG. 2 shows the circulation device 100 for a two-phase cooling system without the removable evaporator 80 connected.
  • the state in which the detachable evaporator 80 is not connected is a state in which the evaporator 80 is removed from the two-phase cooling system circulation device 100 due to maintenance of the heat source 81 or the evaporator 80, for example.
  • the inlet side on-off valve 51 and the outlet side on-off valve 52 are in a closed state.
  • the condenser 20 is configured to cool the liquid phase refrigerant 1 sent from the pump 10 via the bypass channel 75 when the evaporator 80 is not connected.
  • the condenser 20 allows the liquid phase refrigerant 1 to flow in from the inlet of the condenser 20, and causes the cooled liquid phase refrigerant 1 to flow out from the outlet of the condenser 20.
  • the other configuration of the circulation device 100 for a two-phase cooling system in a state where the evaporator 80 is not connected is the same as that for the two-phase cooling system in a state where the evaporator 80 is connected, as described with reference to FIG. Since the configuration is similar to that of the circulation device 100, the explanation will be omitted.
  • a liquid-phase refrigerant 1 is sent from the pump 10.
  • the refrigerant flows through the first refrigerant channel 71 .
  • a portion of the refrigerant flows through the inlet-side opening/closing valve 51 and the inlet-side connecting portion 41 that are fully open, and flows into the evaporator 80 .
  • the remainder of the refrigerant flows into the bypass passage 75, as will be described later.
  • a part of the liquid phase refrigerant 1 that has flowed into the evaporator 80 evaporates and changes into a gas-liquid mixture refrigerant 2.
  • the gas-liquid mixed refrigerant 2 flows from the evaporator 80 into the second refrigerant flow path 72 via the outlet side connection portion 42 .
  • the gas-liquid mixed refrigerant 2 that has flowed into the second refrigerant flow path 72 flows through the outlet-side opening/closing valve 52 and the merging portion 77 which are in a fully open state.
  • the gas-liquid mixed refrigerant 2 merges with the liquid-phase refrigerant 1 that has flowed in from the bypass channel 75 .
  • the combined gas-liquid mixed refrigerant 2 and the liquid-phase refrigerant 1 flowing from the bypass channel 75 flow into the condenser 20 in a gas-liquid mixed state.
  • the gas-phase refrigerant of the gas-liquid mixed refrigerant 2 that has flowed into the condenser 20 is condensed and changed into the liquid-phase refrigerant 1.
  • the condensed liquid phase refrigerant 1 flows from the condenser 20 through the third refrigerant channel 73 and flows into the storage section 30 .
  • the refrigerant that has flowed into the storage section 30 flows through the fourth refrigerant flow path 74 and flows into the pump 10 .
  • the remainder of the liquid phase refrigerant 1 flows into the bypass flow path 75.
  • the refrigerant that has flowed into the bypass flow path 75 flows through the orifice 61 provided in the bypass flow path 75 and flows into the confluence section 77 of the second refrigerant flow path 72 .
  • the liquid phase refrigerant 1 that has flowed in from the bypass channel 75 merges with the gas-liquid mixed refrigerant 2.
  • the inlet side on-off valve 51 and the outlet side on-off valve 52 are fully closed.
  • the liquid phase refrigerant 1 is transferred to the branch part 76 of the first refrigerant flow path 71. Flows into the bypass flow path 75 except for that flowing between the inlet side opening/closing valve 51 and the inlet side opening/closing valve 51.
  • the liquid phase refrigerant 1 flowing from the bypass flow path 75 flows through the second refrigerant flow path 72 and flows into the condenser 20 .
  • a liquid-phase refrigerant 1 is sent from the pump 10.
  • the liquid-phase refrigerant 1 flows through the first refrigerant flow path 71 .
  • the liquid phase refrigerant 1 flows into the bypass flow path 75 .
  • the liquid phase refrigerant 1 that has flowed into the bypass flow path 75 flows through the orifice 61 provided in the bypass flow path 75 and flows into the confluence section 77 of the second refrigerant flow path 72 .
  • the liquid phase refrigerant 1 that has flowed into the confluence section 77 flows through the second refrigerant flow path 72 and enters the condenser 20, except for the refrigerant 1 that has flowed between the confluence section 77 and the outlet side on-off valve 52. Inflow.
  • the liquid phase refrigerant 1 that has flowed into the condenser 20 is cooled or maintained in a cooled state.
  • the liquid phase refrigerant 1 flows from the condenser 20 through the third refrigerant flow path 73 and flows into the storage section 30 .
  • the refrigerant that has flowed into the storage section 30 flows through the fourth refrigerant flow path 74 and flows into the pump 10 .
  • a bypass channel 75 is provided to allow the refrigerant to flow, and at least in a state where the evaporator 80 is not connected to the inlet side connection part 41 and the outlet side connection part 42, the refrigerant is passed through the inlet side connection part 41 and the outlet side connection part 42. , and the refrigerant is circulated through the bypass passage 75.
  • the liquid phase refrigerant 1 can be circulated through the bypass flow path 75.
  • the liquid phase refrigerant 1 can be continuously cooled by the condenser 20 . Therefore, even immediately after the removable evaporator 80 is removed from the inlet side connection part 41 and the outlet side connection part 42 and reconnected, the cooled low temperature liquid phase refrigerant 1 is transferred to the evaporator 80.
  • the heat source 81 can be immediately cooled by the evaporator 80.
  • the method includes a step of circulating the refrigerant through the bypass flow path 75 that allows the refrigerant to flow without passing through the connection part 42, and a step of cooling the refrigerant flowing through the bypass flow path 75 and flowing into the condenser 20.
  • the cooled low temperature liquid phase refrigerant 1 is transferred to the evaporator 80.
  • the heat source 81 can be immediately cooled by the evaporator 80.
  • the flow rate adjustment section 60 provided in the bypass flow path 75 is further provided. Since the flow rate adjustment unit 60 can reduce the cross-sectional area of a portion of the bypass flow path 75, the pressure loss of the bypass flow path 75 can be increased. Thereby, the flow rate of refrigerant flowing into the bypass channel 75 can be reduced in a state where the evaporator 80 is connected. Therefore, when the evaporator 80 is connected, the refrigerant flow rate flowing into the evaporator 80 and the bypass flow path are adjusted so that the refrigerant flow rate flowing into the evaporator 80 is larger than the refrigerant flow rate flowing into the bypass flow path 75. The flow rate of refrigerant flowing into 75 can be adjusted.
  • the flow rate adjustment section 60 is the orifice 61 that adjusts the flow rate of the refrigerant flowing through the bypass channel 75. Since the orifice 61 can increase the pressure loss in the bypass passage 75, the flow rate of refrigerant flowing into the bypass passage 75 can be reduced. Therefore, the refrigerant flow rate of the liquid-phase refrigerant 1 flowing into the evaporator 80 at the branch part 76 and the refrigerant flow rate in the bypass flow path are adjusted so that the refrigerant flow rate flowing into the evaporator 80 is larger than the refrigerant flow rate flowing into the bypass flow path 75. The refrigerant flow rate of the liquid phase refrigerant 1 flowing into the refrigerant 75 can be adjusted with a simple configuration.
  • the condenser 20 condenses and cools the gas phase refrigerant contained in the gas-liquid mixed refrigerant 2 of the refrigerants with the cooling liquid 23 flowing in from the outside. Or, it is configured to cool the liquid phase refrigerant 1 of the refrigerants.
  • the structure of the condenser 20 is simplified and the refrigerant is reliably supplied. It is possible to achieve both cooling.
  • the bypass flow path 75 branches downstream of the pump 10 and upstream of the inlet side connection part 41, and branches downstream of the outlet side connection part 42, and It is connected to the upstream side of the condenser 20.
  • the bypass flow path 75 is not directly connected to the condenser 20, but is connected to the flow path between the outlet side connection part 42 and the condenser 20. Therefore, since a plurality of refrigerant channels are not connected to the condenser 20, the configuration of the condenser 20 can be further simplified. Therefore, it is possible to further suppress the increase in size of the circulation device 100 for a two-phase cooling system.
  • the bypass flow path 75 is provided between the branch part where the bypass flow path 75 branches on the downstream side of the pump 10 and the inlet side connection part 41, and is provided on the inlet side for opening and closing the refrigerant flow path.
  • An on-off valve 51 and an outlet-side on-off valve 52 that is provided between the outlet-side connection portion 42 and a connection portion to which the bypass flow path 75 is connected on the downstream side of the outlet-side connection portion 42 and opens and closes the refrigerant flow path. , further comprising.
  • the condenser can be The liquid phase refrigerant 1 circulating through the bypass channel 75 can be cooled by the condenser 20 without stopping the refrigerant 20 .
  • the storage section 30 is further provided on the downstream side of the condenser 20 and on the upstream side of the pump 10.
  • the storage unit 30 separates the bubbles (gas-phase refrigerant) contained in the gas-liquid mixed refrigerant 2.
  • the liquid phase refrigerant 1 can be sent to the pump 10. Therefore, it is possible to suppress the occurrence of malfunctions in the pump 10 caused by bubbles (gas-phase refrigerant) contained in the refrigerant.
  • the gas-liquid mixed refrigerant 2 flowing out from the evaporator 80 is condensed.
  • the liquid flows into the vessel 20.
  • the gas-liquid mixed refrigerant 2 flows out from the evaporator 80 without completely evaporating the liquid phase refrigerant 1 in the evaporator 80, cooling of the heat source using the latent heat of vaporization in the evaporator 80 is insufficient. It is possible to prevent this from happening.
  • the evaporator attached to the two-phase cooling system circulation device is removed from the two-phase cooling system circulation device.
  • the evaporator attached to the two-phase cooling system circulation device is removed from the two-phase cooling system circulation device.
  • the evaporator from the circulation device for a two-phase cooling system if liquid-phase refrigerant remains in the refrigerant flow path inside the evaporator, the remaining liquid-phase refrigerant will vaporize and flow out. Freezing may occur due to loss of refrigerant and heat of vaporization.
  • the refrigerant inside the evaporator must be It is necessary to collect the refrigerant that remains in the flow path into the storage section.
  • FIG. 5 shows the two-phase cooling system circulation device 300 in a refrigerant recovery state when refrigerant is recovered from the evaporator 80.
  • the evaporator 80 in the refrigerant recovery state, the evaporator 80 is connected to the inlet side connection part 41 and the outlet side connection part 42, the inlet side on-off valve 51 is in the closed state, and the outlet side on-off valve is in the closed state. 52 is in an open state.
  • the same configurations as those in the first embodiment are given the same reference numerals, and the description thereof will be omitted.
  • the two-phase cooling system circulation device 300 according to the second embodiment is different from the two-phase cooling system circulation device 100 according to the first embodiment in that the two-phase cooling system circulation device 300 has an inlet-side opening/closing valve opening/closing mechanism 53, an outlet-side opening/closing valve opening/closing mechanism 54, It further includes a detection unit 31 and a control device 90 (see FIG. 6).
  • the inlet side opening/closing valve opening/closing mechanism 53 is configured to be able to switch the inlet side opening/closing valve 51 between an open state and a closed state.
  • the inlet side opening/closing valve opening/closing mechanism 53 includes, for example, a motor.
  • the inlet side opening/closing valve opening/closing mechanism 53 is connected to a control section 91 (see FIG. 6).
  • the inlet side opening/closing valve 51 is opened and closed by the inlet side opening/closing valve opening/closing mechanism 53 under the control of the control section 91 .
  • the outlet side opening/closing valve opening/closing mechanism 54 is configured to be able to switch the outlet side opening/closing valve 52 between an open state and a closed state.
  • the outlet-side opening/closing valve opening/closing mechanism 54 includes, for example, a motor.
  • the outlet side opening/closing valve opening/closing mechanism 54 is connected to a control section 91 (see FIG. 6).
  • the outlet side opening/closing valve 52 is opened and closed by the outlet side opening/closing valve opening/closing mechanism 54 under the control of the control section 91 .
  • the configurations of the inlet side on-off valve opening/closing mechanism 53 and the outlet side on-off valve opening/closing mechanism 54 are not particularly limited as long as they are known valve opening/closing mechanisms.
  • the detection unit 31 is configured to detect the amount of refrigerant recovered. Specifically, the detection unit 31 is configured to detect the amount of refrigerant stored in the storage portion 30 as the amount of refrigerant recovered.
  • the detection unit 31 is, for example, a liquid level sensor, and measures the liquid level 3 (see FIG. 7) of the liquid phase refrigerant stored in the storage unit 30.
  • the control device 90 includes a control section 91 and a storage section 92.
  • the control unit 91 is configured to perform control to stop the operation of the pump 10 and terminate the refrigerant recovery process based on the detection result by the detection unit 31. Further, the control unit 91 closes the outlet side on-off valve 52 using the outlet side on-off valve opening/closing mechanism 54 based on the detection result by the detection unit 31, so that the refrigerant does not flow from the outlet side on-off valve 52 to the outlet side connection portion 42 side. It is configured to perform control to prevent leakage.
  • the control unit 91 is configured by, for example, a processor such as a CPU (Central Processing Unit).
  • the storage unit 92 includes a volatile storage device and a nonvolatile storage device.
  • the storage unit 92 stores a set storage amount of refrigerant in the storage unit 30, which will be described later, a program for setting the set storage amount, and the like.
  • the set storage amount includes a set liquid level 5 (see FIG. 7), which will be described later.
  • the program for setting the set storage amount includes a program for setting the set liquid level 5.
  • the volatile storage device is used for temporary storage when the control unit 91 performs calculations.
  • the evaporator 80 is connected to the inlet side connection part 41 and the outlet side connection part 42. Further, the inlet side on-off valve 51 is in a closed state, and the outlet side on-off valve 52 is in an open state.
  • the heat source 81 is not generating heat.
  • a liquid-phase refrigerant 1 is sent from the pump 10.
  • the liquid-phase refrigerant 1 flows through the first refrigerant flow path 71 . Since the inlet side on-off valve 51 is in a fully closed state, the liquid phase refrigerant 1 flows into the branch part 76 of the first refrigerant flow path 71 between the branch part 76 and the inlet side on-off valve 51. Flows into the bypass flow path 75 except for the remaining part. The liquid phase refrigerant 1 that has flowed into the bypass flow path 75 flows into the confluence section 77 of the second refrigerant flow path 72 .
  • the liquid phase refrigerant 1 that has flowed into the confluence section 77 flows through the second refrigerant flow path 72 and flows into the condenser 20 .
  • the refrigerant that has entered the condenser 20 flows through the third refrigerant flow path 73 and flows into the storage section 30 .
  • the refrigerant that has flowed into the storage section 30 flows through the fourth refrigerant flow path 74 and flows into the pump 10 .
  • the liquid phase refrigerant 1 is not sent to the evaporator 80 from the pump 10. Therefore, the liquid phase refrigerant 1 circulating in the two-phase cooling system circulation device 300 does not flow into the evaporator 80 in the refrigerant recovery state.
  • the liquid phase refrigerant 1 remains in the refrigerant flow path 83 inside the evaporator 80 .
  • the heat source 81 has stopped generating heat, the temperature inside the evaporator 80 increases due to heat from the outside air.
  • the liquid phase refrigerant 1 sent from the pump 10 flows into the confluence section 77 of the second refrigerant flow path 72 from the bypass flow path 75, and flows through the second refrigerant flow path 72, the condenser 20, and the third refrigerant flow path 72. It circulates through the flow path 73, the storage section 30, and the fourth refrigerant flow path 74.
  • This circulating liquid phase refrigerant 1 is cooled or maintained in a cooled state by a condenser 20. Therefore, the pressure of the gas-phase refrigerant of the gas-liquid mixed refrigerant 2 remaining in the evaporator 80 is higher than the pressure of the liquid-phase refrigerant 1 circulating through the two-phase cooling system circulation device 300.
  • the pressure of the gas-phase refrigerant contained in the gas-liquid mixed refrigerant 2 in the evaporator 80 and the confluence section 77 of the second refrigerant flow path 72 to the condenser 20, the storage section 30, the pump 10, and the bypass flow path 75 The pressure difference between the pressure and the pressure of the liquid phase refrigerant 1 circulating in the path passing through becomes large. Due to this pressure difference, the gas-liquid mixed refrigerant 2 in the evaporator 80 flows out from the evaporator 80 toward the confluence section 77 of the second refrigerant flow path 72 .
  • the gas-phase refrigerant of the gas-liquid mixed refrigerant 2 in the evaporator 80 flows out from the evaporator 80 toward the confluence section 77 of the second refrigerant flow path 72, and also flows inside the evaporator 80.
  • the liquid phase refrigerant of the gas-liquid mixture refrigerant 2 flows out of the evaporator 80 so as to be pushed out.
  • the gas-liquid mixed refrigerant 2 flowing out from the evaporator 80 merges with the liquid-phase refrigerant 1 flowing in from the bypass passage 75, and the gas-liquid mixed refrigerant 2 contained in the combined gas-liquid refrigerant 2
  • the phase refrigerant is condensed.
  • the liquid phase refrigerant 1 after the merging flows through the second refrigerant flow path 72 and flows into the condenser 20 . That is, the gas-liquid mixed refrigerant 2 in the evaporator 80 flows through the second refrigerant flow path 72 and is guided to the condenser 20 .
  • the refrigerant that remains in the refrigerant flow path inside the evaporator 80 is collected into the storage section 30. Note that since the flow path 83 inside the evaporator 80 cannot be evacuated, all the refrigerant inside the evaporator 80 cannot be recovered. However, the amount of refrigerant retained inside the evaporator 80 when the evaporator 80 is removed from the two-phase cooling system circulation device 300 can be reduced.
  • the amount of stored refrigerant detected by the detection unit 31 is equal to or greater than a preset storage amount.
  • the control unit 91 performs control to close the outlet side on-off valve 52 to prevent the refrigerant from flowing out from the outlet side on-off valve 52 to the outlet side connection part 42 side, and also stops the operation of the pump 10.
  • the refrigerant recovery process is configured to be controlled to end the refrigerant recovery process.
  • the set storage amount includes the set liquid level 5. Further, the stored amount of refrigerant includes a liquid level of 3 of the refrigerant.
  • the bypass flow path 75 is The refrigerant is circulated through the That is, in a state where the evaporator 80 is not connected to the inlet side connection part 41 and the outlet side connection part 42, the refrigerant circulates within the two-phase cooling system circulation device 300.
  • the detection unit 31 measures the liquid level of the liquid phase refrigerant 1 stored in the storage unit 30.
  • the liquid level 3 (see FIG. 7) of the liquid phase refrigerant 1 stored in the storage section 30 in the refrigerant recovery state is lower than the liquid level 3 (see FIG. 7) of the liquid phase refrigerant 1 stored in the storage section 30 in the refrigerant recovery state.
  • the liquid level becomes equal to the liquid level of the phase refrigerant 1 it can be said that the refrigerant remaining in the evaporator 80 has been collected into the storage section 30.
  • a set liquid level 5 is set based on the liquid level 4 of the liquid phase refrigerant 1 stored in the storage section 30 when the evaporator 80 is not connected.
  • the set liquid level 5 is the amount of refrigerant that cannot be recovered in the evaporator 80 with respect to the liquid level 4 of the liquid phase refrigerant 1 stored in the storage section 30 when the evaporator 80 is not connected. This is the liquid level of the liquid-phase refrigerant 1 stored in the storage section 30 in the refrigerant recovery state, which is set by subtracting a margin such as . Therefore, when the liquid level of the liquid phase refrigerant stored in the storage section 30 in the refrigerant recovery state reaches the set liquid level 5 or higher, it is assumed that the refrigerant remaining in the evaporator 80 has been recovered to the storage section 30. sell.
  • the set liquid level 5 is set by the control unit 91. That is, the control unit 91 acquires the liquid level 4 of the liquid phase refrigerant 1 stored in the storage unit 30 in a state where the evaporator 80 is not connected, which is detected by the detection unit 31, and also acquires the liquid level 4 of the liquid phase refrigerant 1 stored in the storage unit 30 in a state where the evaporator 80 is not connected.
  • the set liquid level 5 is set by executing a program for setting the set liquid level 5 stored in the .
  • the set liquid level 5 is stored in the storage section 92.
  • the refrigerant is recovered from the evaporator 80 before removing the evaporator 80. That is, the evaporator 80 is connected to the inlet side connection part 41 and the outlet side connection part 42 shown in FIG. As shown in FIG. 5, from the state in which the When the on-off valve 52 is in the open refrigerant recovery state, the refrigerant is circulated through the bypass channel 75 without going through the evaporator 80 . In the refrigerant recovery state, heat generation from the heat source 81 is stopped. At this time, the detection unit 31 measures the liquid level 3 (see FIG. 7) of the liquid phase refrigerant 1 stored in the storage unit 30 in the refrigerant recovery state.
  • the control unit 91 acquires the liquid level 3 of the liquid phase refrigerant 1 stored in the storage unit 30, which is detected by the detection unit 31. As shown in FIG. 7, as time t passes, the liquid level h (liquid level 3) of the liquid phase refrigerant 1 stored in the storage section 30 rises.
  • the control unit 91 controls the outlet side opening/closing. Control is performed to close the valve 52 to prevent the refrigerant from flowing out from the outlet-side opening/closing valve 52 to the outlet-side connection portion 42 side, and control is performed to stop the operation of the pump 10 to complete the refrigerant recovery process.
  • step S1 the evaporator 80 is connected, the inlet side on-off valve 51 and the outlet side on-off valve 52 are in an open state, and the heat source 81 is cooled by the evaporator 80, and heat generation of the heat source 81 is stopped.
  • the control unit 91 closes the inlet-side on-off valve 51 using the inlet-side on-off valve opening/closing mechanism 53 to enter the refrigerant recovery state.
  • the refrigerant recovery state the refrigerant is circulated through the bypass passage 75 without passing through the evaporator 80. After that, the process proceeds to step S2.
  • step S2 the control unit 91 obtains the liquid level 3 of the liquid phase refrigerant 1 stored in the storage unit 30 detected by the detection unit 31. After that, the process proceeds to step S3.
  • step S3 if the liquid level 3 of the obtained liquid phase refrigerant 1 is equal to or higher than the set liquid level 5 (Yes in step S3), the process proceeds to step S4, If there is (No in step S3), the process proceeds to step S2.
  • step S4 the control unit 91 closes the outlet side on-off valve 52 using the outlet side on-off valve opening/closing mechanism 54. After that, the process proceeds to step S5.
  • step S5 the control unit 91 stops the operation of the pump 10. After that, the refrigerant recovery process ends.
  • the bypass flow path 75 is provided on the downstream side of the pump 10 between the branch part 76 and the inlet side connection part 41, and is provided on the inlet side to open and close the refrigerant flow path.
  • the refrigerant is further provided with an on-off valve 51, and when the refrigerant is recovered from the evaporator 80, the evaporator 80 is connected to the inlet side connection part 41 and the outlet side connection part 42, and the inlet side on-off valve 51 is closed. In the recovery state, the refrigerant is circulated through the bypass passage 75 without passing through the evaporator 80, and the refrigerant in the evaporator 80 is guided to the condenser 20.
  • the inlet side opening/closing valve 51 Since the inlet side opening/closing valve 51 is closed, the circulating liquid phase refrigerant 1 does not flow into the evaporator 80, and the evaporator 80 receives heat from the outside air, so that the inside of the evaporator 80 is The temperature rises. Therefore, the temperature and pressure of the liquid-phase refrigerant 1 remaining in the evaporator 80 rise, and a portion of the liquid-phase refrigerant 1 in the evaporator 80 is evaporated and changed to a gas-liquid mixed refrigerant 2.
  • the pressure of the gas-phase refrigerant contained in the gas-liquid mixed refrigerant 2 in the evaporator 80 is increased from the confluence part 77 of the second refrigerant flow path 72 to the condenser 20, the storage part 30, the pump 10, and the bypass flow path. Since a pressure difference occurs between the pressure of the liquid-phase refrigerant 1 circulating in the path passing through the evaporator 75, the gas-liquid mixed refrigerant 2 in the evaporator 80 is transferred from the evaporator 80 to the confluence of the second refrigerant flow path 72. It can flow out toward the section 77.
  • liquid phase refrigerant 1 in the evaporator 80 can be changed to the gas-liquid mixed refrigerant 2 due to an increase in the temperature inside the evaporator 80, a heater etc. There is no need to install additional equipment. For these reasons, an increase in the number of parts and a complication of the structure can be suppressed, and the refrigerant remaining in the refrigerant flow path 83 inside the evaporator 80 can be easily recovered.
  • the detection unit 31 detects the amount of refrigerant recovered, and the operation of the pump 10 is stopped based on the detection result by the detection unit 31 to end the refrigerant recovery process. It further includes a control section 91. Thereby, the refrigerant recovery process can be completed based on the detection result by the detection unit 31 that detects the amount of refrigerant recovered. Therefore, the refrigerant recovery process can be reliably performed based on the detection result by the detection unit 31 that detects the amount of refrigerant recovered.
  • the storage section 30 is provided downstream of the condenser 20 and upstream of the pump 10, and the detection section 31 detects the amount of refrigerant stored as the recovered amount.
  • the amount of refrigerant stored in the section 30 is detected.
  • the operation of the pump 10 can be stopped and the refrigerant recovery process can be ended based on the detection result of the amount of refrigerant stored in the storage section 30 as the amount of refrigerant recovered. Therefore, the detection result of the amount of refrigerant recovered can be obtained with the simple configuration of the detection unit 31, so it is possible to suppress the structure of the two-phase cooling system circulation device 300 from becoming complicated.
  • the control unit 91 performs control to stop the operation of the pump 10 and terminate the refrigerant recovery process. Thereby, it is possible to more easily detect that the refrigerant remaining in the evaporator 80 has been collected into the storage section 30 based on the set storage amount. Therefore, the refrigerant recovery process can be performed more easily and more reliably based on the set storage amount.
  • a refrigerant flow path is provided between the outlet side connection part 42 and the connection part to which the bypass flow path 75 is connected downstream of the outlet side connection part 42.
  • the control unit 91 further includes an outlet-side on-off valve 52 that opens and closes, and the control unit 91 closes the outlet-side on-off valve 52 based on the detection result by the detection unit 31 to prevent refrigerant from flowing from the outlet-side on-off valve 52 to the outlet-side connection portion 42 side. Perform controls to prevent leakage.
  • the evaporator 80 when recovering the refrigerant from the evaporator 80, the evaporator 80 is connected to the inlet side connection part 41 and the outlet side connection part 42, and , in the refrigerant recovery state in which the inlet-side opening/closing valve 51 provided between the branching part 76 where the bypass passage 75 branches and the inlet-side connection part 41 is closed, the bypass passage 75 is closed without going through the evaporator 80.
  • the pressure of the gas-phase refrigerant contained in the gas-liquid mixed refrigerant 2 in the evaporator 80 is increased from the confluence part 77 of the second refrigerant flow path 72 to the condenser 20, the storage part 30, the pump 10, and the bypass flow path.
  • the gas-liquid mixed refrigerant 2 in the evaporator 80 is transferred from the evaporator 80 to the confluence of the second refrigerant flow path 72. It can flow out toward the section 77.
  • the liquid phase refrigerant 1 in the evaporator 80 can be changed to the gas-liquid mixed refrigerant 2 due to an increase in the temperature inside the evaporator 80, a heater etc. There is no need to install additional equipment. For these reasons, an increase in the number of parts and a complication of the structure can be suppressed, and the refrigerant remaining in the refrigerant flow path 83 inside the evaporator 80 can be easily recovered.
  • the flow rate adjustment section 60 was provided in the bypass channel 75, but the present invention is not limited to this.
  • the flow rate adjustment section 60 may not be provided in the bypass channel 75.
  • the distribution of the refrigerant flow rate flowing into the evaporator 80 and the refrigerant flow rate flowing into the bypass flow path 75 when the evaporator 80 is connected is adjusted. This can be done, for example, by changing the pipe diameter and channel length of the bypass channel 75.
  • the flow rate of refrigerant flowing into the evaporator 80 is greater than the flow rate of refrigerant flowing into the bypass channel 75, but the present invention is not limited to this.
  • the refrigerant flow rate flowing into the evaporator 80 and the refrigerant flow rate flowing into the bypass flow path 75 may be configured to be equal, or the refrigerant flow rate flowing into the evaporator 80 may flow into the bypass flow path 75. It may be configured to be smaller than the refrigerant flow rate.
  • the flow rate adjustment section 60 is the orifice 61, but the present invention is not limited to this.
  • the flow rate adjustment section 60 may be a flow rate adjustment valve 62.
  • the flow rate adjustment valve 62 is not particularly limited as long as it is a known valve such as a needle valve that can be closed and can adjust the flow rate.
  • the opening degree adjustment of the flow rate adjustment valve 62 may be performed manually or may be performed under computer control.
  • the flow rate adjustment unit 60 When the flow rate adjustment unit 60 is a flow rate adjustment valve 62, it may be configured to adjust the opening degree of the flow rate adjustment valve 62 according to the cooling level of the object to be cooled, which is the heat source 81.
  • the opening degree of the flow rate regulating valve 62 in a state where the need for cooling the object to be cooled is lower than in the normal operating state can be made larger than the opening degree of the flow rate regulating valve 62 in the normal operating state.
  • the flow rate of refrigerant flowing into the evaporator 80 can be made smaller than the flow rate of refrigerant flowing into the bypass channel 75.
  • the load on the pump 10 can be reduced.
  • the flow rate of refrigerant flowing into the evaporator 80 is desired to be lower than the minimum flow rate of the pump 10
  • the flow rate of refrigerant flowing into the evaporator 80 is reduced by adjusting the opening degree of the flow rate adjustment valve 62 to be large. It can be adjusted as follows.
  • the inlet side on-off valve 51 and the outlet side on-off valve 52 are provided, but the present invention is not limited to this.
  • both the inlet side on-off valve 51 and the outlet side on-off valve 52 may not be provided, or either the inlet side on-off valve 51 or the outlet side on-off valve 52 may not be provided.
  • bypass flow path 75 is connected to the downstream side of the outlet side connection part 42 and the upstream side of the condenser 20, but the present invention is not limited to this. do not have.
  • the bypass flow path 75 may be directly connected to the condenser 20 and may not be connected to the flow path between the outlet side connection portion 42 and the condenser 20.
  • the storage section 30 is provided, but the present invention is not limited to this.
  • the storage section 30 may not be provided.
  • the two-phase cooling system circulation device 100 is a portable type, but the present invention is not limited to this.
  • the circulation device 100 for a two-phase cooling system may be of a fixed installation type.
  • the gas-liquid mixed refrigerant 2 flowing out from the evaporator 80 flows into the condenser 20 while the evaporator 80 is connected.
  • the refrigerant flowing out from the evaporator 80 may be in a single gaseous phase.
  • the detection unit 31 is a liquid level sensor, and detects the amount of refrigerant stored in the storage unit 30 as the amount of refrigerant recovered.
  • the detection unit is a differential pressure type level sensor, and the amount of refrigerant stored in the storage unit as the amount of refrigerant recovered is determined by the difference between the pressure at the bottom of the storage unit and the pressure at the liquid level. It may be detected by measuring. Further, the detection section may be another known sensor.
  • the set liquid level 5 is set by the control unit 91, but the present invention is not limited to this.
  • the set liquid level 5 may be set by the user.
  • the detection unit 31 detects the amount of refrigerant stored in the storage unit 30 as the amount of refrigerant recovered, but the present invention is not limited to this.
  • a circulation device for a two-phase cooling system is equipped with a detection section near the inlet and an exit of the storage section, and detects the refrigerant flow rate detected by the detection section near the inlet and the detection section near the outlet. The amount of recovered refrigerant may be detected based on the refrigerant flow rate.
  • the control unit stops the operation of the pump and cools the refrigerant. Control may be performed to end the collection process.
  • a detection section is provided between the outlet-side opening/closing valve and the confluence section, and the amount of refrigerant recovered is detected based on the refrigerant flow rate detected by the detection section. It may be configured as follows.
  • the control portion 91 stops the operation of the pump 10 to remove the refrigerant.
  • the control unit 91 controls the operation of the pump 10 when the amount of change in the amount of stored refrigerant detected by the detection unit 31 becomes equal to or less than a preset amount of change. Control may also be performed to stop the refrigerant recovery process.
  • the amount of change in the amount of stored refrigerant includes the amount of change 6 in the liquid level of the refrigerant (see FIG. 9).
  • the amount of change 6 per unit time in the liquid level of the liquid phase refrigerant 1 stored in the storage section 30 is the largest. , as time t passes, the amount of change 6 in the liquid level of the liquid phase refrigerant 1 per unit time becomes smaller. Therefore, as the set change amount 7, the amount of change in the liquid level of the liquid phase refrigerant 1 per unit time is set in advance.
  • the set change amount 7 is a reference value at which it can be assumed that the refrigerant remaining in the evaporator 80 has been collected into the storage section 30.
  • the setting change amount 7 is set in advance by the user.
  • the setting change amount 7 is stored in the storage section 92.
  • the control unit 91 acquires the liquid level of the liquid phase refrigerant 1 stored in the storage unit 30, which is detected by the detection unit 31.
  • the control unit 91 obtains the amount of change 6 of the liquid level of the liquid phase refrigerant 1 per unit time based on the liquid level of the liquid phase refrigerant 1 detected by the detection unit 31 .
  • the control unit 91 closes the outlet side opening/closing valve 52 to open/close the outlet side. Control is performed to prevent the refrigerant from flowing out from the valve 52 to the outlet side connection portion 42 side, and control is also performed to stop the operation of the pump 10 and complete the refrigerant recovery process.
  • the control unit 91 performs control to stop the operation of the pump 10 and terminate the refrigerant recovery process.
  • the control unit 91 controls the amount of refrigerant in the evaporator 80 based on the set change amount 7. It is possible to reliably detect that the refrigerant remaining in the storage section 30 has been collected into the storage section 30.
  • control unit 91 causes the liquid level 3 of the liquid phase refrigerant 1 detected by the detection unit 31 to become equal to or higher than the preset liquid level 5 (see FIG. 7), and When the amount of change 6 in the liquid level of the liquid phase refrigerant 1 becomes equal to or less than a preset change amount 7, the pump 10 is controlled to stop operating and the refrigerant recovery process is completed. You can leave it there.
  • control unit 91 controls the inlet side on-off valve opening/closing mechanism 53 to close the inlet side on-off valve 51, and controls the outlet side on-off valve opening/closing mechanism 54 on the outlet side based on the set storage amount.
  • control is performed to close the on-off valve 52 and control to stop operation of the pump 10 based on the set storage amount
  • the present invention is not limited to this.
  • the user may do all of the above.
  • the operation of closing the inlet side on-off valve 51, the operation of closing the outlet side on-off valve 52 based on the set storage amount, and the operation of stopping the operation of the pump 10 based on the set storage amount are all performed by the user.
  • the control unit may not be provided.
  • the user may manually close the inlet-side opening/closing valve 51. Further, the user may manually close the outlet side opening/closing valve 52 based on visual confirmation of the liquid level gauge. Further, the user may perform an operation to stop the operation of the pump 10 based on visual confirmation of the liquid level gauge.
  • the outlet side on-off valve opening/closing mechanism 54 closes the outlet side on-off valve 52 and stops the operation of the pump 10 to remove the refrigerant.
  • the two-phase cooling system circulation device 300 further includes a notification section 93, and the control section 91 causes the notification section 93 to indicate that the storage amount of refrigerant detected by the detection section 31 is the set storage amount. It may be configured to notify that the amount of change in the stored amount of refrigerant has become equal to or greater than the set amount of change, or to notify that the amount of change in the amount of stored refrigerant detected by the detection unit 31 has become less than or equal to the set amount of change.
  • the user can confirm that the amount of stored refrigerant detected by the detection unit 31 has become equal to or greater than the set amount of storage, or that the amount of change in the amount of stored refrigerant detected by the detection portion 31 has become less than or equal to the set amount of change. Since the user can recognize this, the user can promptly perform the operation of closing the outlet side on-off valve 52 and the operation of stopping the operation of the pump 10.
  • the user When the user is notified of the above by the notification unit 93, the user performs an operation to close the outlet side opening/closing valve 52 and also performs an operation to stop the operation of the pump 10.
  • the notification section 93 includes a display section 94, and is configured to notify when the amount of stored refrigerant detected by the detection section 31 is equal to or higher than a preset storage amount, or when the amount of stored refrigerant detected by the detection section 31 is When the amount of change in the storage amount becomes equal to or less than the set amount of change, the control unit 91 may control the display unit 94 to display a notification stating that “refrigerant has been collected.”
  • the notification section 93 includes an audio output section 95 instead of the display section 94 or together with the display section 94, and the notification section 93 includes an audio output section 95 when the amount of stored refrigerant detected by the detection section 31 exceeds a preset setting storage amount.
  • control unit 91 outputs a message “Refrigerant has been collected” to the audio output unit 95. Control may also be performed to make an announcement.
  • a first three-way valve 98 is provided at the branching section 76 in place of the inlet-side on-off valve 51, the outlet-side on-off valve 52, and the flow rate adjustment section 60, and the confluence section 77 may be provided with a second three-way valve 99.
  • the control unit 91 may be configured to control switching between the first three-way valve 98 and the second three-way valve 99, or the user may switch between the first three-way valve 98 and the second three-way valve 99. It's okay.
  • a circulation device for a two-phase cooling system that configures a two-phase cooling system that circulates a refrigerant by connecting a detachable evaporator, a pump for feeding the refrigerant; an inlet side connection part provided downstream of the pump and connected to the refrigerant inlet of the evaporator, and an outlet side connection part connected to the refrigerant outlet; a condenser that is provided downstream of the outlet side connection part and cools the refrigerant; a bypass flow path that branches downstream of the pump and upstream of the inlet side connection part and allows the refrigerant to flow to the condenser without going through the inlet side connection part and the outlet side connection part; Prepare, At least in a state where the evaporator is not connected to the inlet side connection part and the outlet side connection part, the A circulation device for two-phase cooling systems that circulates refrigerant.
  • the condenser condenses and cools a gas-phase refrigerant contained in a gas-liquid mixture of the refrigerants, or a liquid-phase refrigerant of the refrigerants, using a cooling liquid introduced from the outside.
  • Circulation device for a two-phase cooling system according to any one of items 1 to 5, configured to cool.
  • the bypass flow path branches downstream of the pump and upstream of the inlet connection part, and is connected to the downstream side of the outlet connection part and upstream of the condenser.
  • the circulation device for a two-phase cooling system according to any one of items 1 to 6.
  • an inlet opening/closing valve that opens and closes the refrigerant flow path and is provided between a branching part where the bypass flow path branches on the downstream side of the pump and the inlet side connection part; and an inlet side opening/closing valve that opens and closes the refrigerant flow path;
  • (Item 12) a detection unit that detects the amount of recovered refrigerant;
  • (Item 16) Notification that the storage amount of the refrigerant detected by the detection unit has become equal to or greater than the set storage amount, or notification that the amount of change in the storage amount of the refrigerant detected by the detection unit has become equal to or less than the set amount of change.
  • (Item 17) further comprising an outlet-side opening/closing valve that is provided between the outlet-side connection part and a connection part to which the bypass flow path is connected downstream of the outlet-side connection part, and opens and closes the refrigerant flow path; Item 13, wherein the control unit performs control to close the outlet side on-off valve and prevent the refrigerant from flowing out from the outlet side on-off valve to the outlet side connection part side based on the detection result by the detection unit.
  • a circulation device for a two-phase cooling system as described in .
  • a refrigerant circulation method in a two-phase cooling system circulation device that configures a two-phase cooling system that circulates a refrigerant by connecting a detachable evaporator, the method comprising: At least in a state where the evaporator is not connected to an inlet side connection part connected to the refrigerant inlet of the evaporator and an outlet side connection part connected to the refrigerant outlet of the evaporator, the inlet side connection part and the circulating the refrigerant through a bypass flow path that allows the refrigerant to flow without passing through the outlet side connection part;
  • a refrigerant circulation method comprising the step of cooling the refrigerant flowing through the bypass flow path and flowing into the condenser.
  • the evaporator When recovering the refrigerant from the evaporator, the evaporator is connected to the inlet side connection part and the outlet side connection part, and a branch part where the bypass flow path branches and the inlet side connection part are connected.

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PCT/JP2023/017737 2022-05-27 2023-05-11 二相冷却システム用循環装置および二相冷却システム用循環装置における冷媒循環方法 Ceased WO2023228765A1 (ja)

Priority Applications (5)

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CN202380042883.XA CN119278349A (zh) 2022-05-27 2023-05-11 两相冷却系统用循环装置以及两相冷却系统用循环装置中的制冷剂循环方法
KR1020247039756A KR20250004027A (ko) 2022-05-27 2023-05-11 2상 냉각 시스템용 순환 장치 및 2상 냉각 시스템용 순환 장치에서의 냉매 순환 방법
EP23811640.4A EP4534941A1 (en) 2022-05-27 2023-05-11 Circulation device for two-phase cooling system and refrigerant circulation method in circulation device for two-phase cooling system
JP2024523033A JP7831594B2 (ja) 2022-05-27 2023-05-11 二相冷却システム用循環装置および二相冷却システム用循環装置における冷媒循環方法
US18/961,310 US20250093079A1 (en) 2022-05-27 2024-11-26 Circulation device for two-phase cooling system and refrigerant circulation method in circulation device for two-phase cooling system

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KR102518852B1 (ko) * 2018-11-07 2023-04-10 신와 콘트롤즈 가부시키가이샤 유체 온조 시스템 및 냉동 장치
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JP2003179375A (ja) 2001-09-26 2003-06-27 Modine Mfg Co 高電力電子キャビネットのためのモジュール式冷却装置及び熱バス
JP2005233505A (ja) * 2004-02-19 2005-09-02 Mitsubishi Electric Corp 配管洗浄方法および配管洗浄装置
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EP4534941A1 (en) 2025-04-09
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