WO2023175757A1 - Climatiseur - Google Patents

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Publication number
WO2023175757A1
WO2023175757A1 PCT/JP2022/011822 JP2022011822W WO2023175757A1 WO 2023175757 A1 WO2023175757 A1 WO 2023175757A1 JP 2022011822 W JP2022011822 W JP 2022011822W WO 2023175757 A1 WO2023175757 A1 WO 2023175757A1
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WIPO (PCT)
Prior art keywords
heat
piping
source side
heat exchanger
heat medium
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PCT/JP2022/011822
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English (en)
Japanese (ja)
Inventor
博紀 鷲山
宗史 池田
Original Assignee
三菱電機株式会社
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Application filed by 三菱電機株式会社 filed Critical 三菱電機株式会社
Priority to PCT/JP2022/011822 priority Critical patent/WO2023175757A1/fr
Publication of WO2023175757A1 publication Critical patent/WO2023175757A1/fr

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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

Definitions

  • This technology relates to air conditioners. In particular, it relates to the prevention of freezing of a heat medium in a heat medium heat exchanger.
  • an air conditioner that performs air conditioning by configuring a heat medium circulation circuit that circulates a heat medium containing water or brine between a heat source side device and an indoor unit.
  • the heat source side device has a heat source side refrigerant circulation circuit, circulates the heat source side refrigerant, heats or cools the heat medium by exchanging heat in the heat medium heat exchanger, and heats or cools the heat medium. supply heat to.
  • the indoor unit heats or cools indoor air using heat supplied by a heat medium to perform air conditioning (for example, see Patent Document 1).
  • a defrost operation may be performed in which the high temperature heat source side refrigerant is passed through the heat source side heat exchanger to defrost the heat source side heat exchanger.
  • the expansion device is in an open state, and the heat source side refrigerant flows into the heat medium heat exchanger.
  • the heat source side refrigerant that has undergone heat exchange with the frost is a low-temperature refrigerant in a liquid phase or a two-phase gas-liquid phase. Therefore, the heat source side refrigerant that has flowed into the heat medium heat exchanger may freeze the heat medium within the heat medium heat exchanger. When the heat medium freezes, the heat medium expands in volume, causing a freeze puncture, which may damage or deform the heat exchanger tubes of the heat medium heat exchanger.
  • an air conditioner may also be considered in which the heat source side refrigerant circulation circuit has a bypass pipe and the low temperature heat source side refrigerant is passed through the bypass pipe.
  • the throttle device is closed and the heat source side refrigerant is passed through the bypass piping, there is a possibility that the liquid phase heat source side refrigerant that has passed through the bypass piping will flow backwards and flow into the heat medium heat exchanger. .
  • an object of the present invention to provide an air conditioner having a structure in which a low-temperature heat source side refrigerant does not flow into a heat medium heat exchanger.
  • the disclosed air conditioning apparatus circulates the heat medium by connecting a pump that pressurizes a heat medium, which is a medium for transporting heat, and an indoor heat exchanger that exchanges heat between indoor air to be air conditioned and the heat medium.
  • a heat medium circulation circuit a compressor that compresses the heat source side refrigerant, a heat source side heat exchanger that exchanges heat between the heat source side refrigerant and outdoor air, a throttling device that reduces the pressure of the heat source side refrigerant, and a heat source side refrigerant and heat medium.
  • a heat medium heat exchanger for exchanging heat is connected to the heat source side refrigerant circulation circuit through which the heat source side refrigerant is circulated.
  • Bypass piping to be bypassed a bypass valve that allows the heat source side refrigerant to pass through or shut off to the bypass piping, and one end of the heat medium heat exchanger side piping connected to the heat medium heat exchanger, one end of which is connected to the heat source side refrigerant suction side of the compressor.
  • the heat medium heat exchanger side piping at the junction has a confluence section to which the compressor side piping and bypass piping are connected, and the pipe axis of the heat medium heat exchanger side piping at the confluence section is inclined upwards from the horizontal direction or vertically upward. It is connected to the compressor side piping and bypass piping.
  • the pipes on the heat medium heat exchanger side have their pipe axes tilted upward from the horizontal direction or facing upward in the vertical direction to compress the air. It is configured to be connected to machine side piping and bypass piping. This prevents the low-temperature liquid phase heat source refrigerant flowing into the confluence section from flowing into the heat medium heat exchanger from the heat medium heat exchanger side piping, and prevents the heat medium from freezing in the heat medium heat exchanger. This can prevent the occurrence of freeze punctures.
  • FIG. 1 is a diagram schematically showing an installation example of an air conditioner according to Embodiment 1.
  • FIG. 1 is a diagram showing an example of the configuration of an air conditioner according to Embodiment 1.
  • FIG. 3 is a diagram showing an example of the configuration of a control device 4 included in the air conditioner according to Embodiment 1.
  • FIG. 3 is a diagram showing an example of a layout structure of piping through which a heat source side refrigerant passes within the relay unit 2 according to the first embodiment.
  • FIG. 3 is a diagram illustrating an example of the structure of a confluence section 26a according to the first embodiment.
  • 7 is a diagram illustrating another example of the structure of the merging portion 26a according to the first embodiment.
  • FIG. 6 is a diagram illustrating a modification of the arrangement structure of the piping through which the heat source side refrigerant passes within the relay unit 2 according to the first embodiment.
  • FIG. 7 is a diagram illustrating another modification of the arrangement structure of the piping through which the heat source side refrigerant passes within the relay unit 2 according to the first embodiment.
  • FIG. 7 is a diagram illustrating another modification of the arrangement structure of the piping through which the heat source side refrigerant passes within the relay unit 2 according to the first embodiment.
  • FIG. 3 is a diagram showing the configuration of an air conditioner according to a second embodiment.
  • FIG. 3 is a diagram showing the configuration of an air conditioner according to Embodiment 3.
  • FIG. 7 is a diagram showing the configuration of an air conditioner according to Embodiment 4.
  • FIG. 7 is a diagram showing the configuration of an air conditioner according to Embodiment 5.
  • the height of pressure and temperature is not determined particularly in relation to absolute values, but is determined relatively depending on the state and operation of the device etc. Additionally, if there is no need to distinguish or specify multiple devices of the same type that are distinguished by subscripts, the subscripts may be omitted from the description. Further, in the drawings, the size relationship of each component may differ from the actual one.
  • FIG. 1 is a diagram schematically showing an installation example of an air conditioner according to the first embodiment.
  • An installation example of the air conditioner according to Embodiment 1 will be described based on FIG. 1.
  • the air conditioner includes a heat source side refrigerant circulation circuit A that circulates a heat source side refrigerant, and a heat medium circulation circuit B that circulates a heat medium that transfers, transfers, and the like.
  • the air conditioner then performs air conditioning in the room, which is the space to be air conditioned, by heating and cooling.
  • the heat source side refrigerant circulation circuit A functions as a heat source side device that supplies hot or cold heat to the indoor side by heating or cooling the heat medium in the heat medium circulation circuit B.
  • the air conditioner according to the first embodiment includes one outdoor unit 1 as a heat source device, a plurality of indoor units 3 (indoor units 3a to 3c) as indoor units, and a relay unit 2.
  • the relay unit 2 is a unit that relays heat transfer between the heat source side refrigerant circulating in the heat source side refrigerant circulation circuit A and the heat medium circulating in the heat medium circulation circuit B.
  • the outdoor unit 1 and the relay unit 2 are connected by a refrigerant pipe 5 that serves as a flow path for the heat source side refrigerant.
  • a plurality of relay units 2 can be connected in parallel to one outdoor unit 1.
  • each indoor unit 3 is connected to the relay unit 2 through a heat medium pipe 6 that serves as a flow path for the heat medium.
  • the indoor unit 3 is a unit that performs air conditioning on indoor air to be air conditioned.
  • the indoor unit 3 is an example of a destination to which heat is transferred by the heat medium.
  • the indoor unit 3 may also be used for cooling equipment in factories and reheating buildings.
  • the heat medium circulating in the heat medium circulation circuit B for example, brine (antifreeze), water, a mixture of brine and water, a mixture of water and an additive having a high anticorrosion effect, etc. can be used. Refrigerants that do not change state over a range can be used. In this manner, in the air conditioner of the first embodiment, a highly safe heat medium can be used as the heat medium.
  • FIG. 2 is a diagram showing an example of the configuration of the air conditioner according to the first embodiment. Based on FIG. 2, the configuration of devices included in the air conditioner will be described. As described above, the outdoor unit 1 and the relay unit 2 are connected by the refrigerant pipe 5. Further, the relay unit 2 and each indoor unit 3 are connected by a heat medium pipe 6. Here, in FIG. 2, three indoor units 3 (indoor units 3a to 3c) are connected to the relay unit 2 via heat medium piping 6. However, the number of connected indoor units 3 is not limited to three.
  • the outdoor unit 1 is a unit that circulates the heat source side refrigerant in the heat source side refrigerant circulation circuit A to transport heat, and causes the heat medium heat exchanger 20 of the relay unit 2 to perform heat exchange with the heat medium.
  • the outdoor unit 1 transports heat using the heat source side refrigerant.
  • the outdoor unit 1 includes a compressor 10, a flow path switching valve 11, a heat source side heat exchanger 12, an accumulator 13, and a heat source side blower 14 in a housing.
  • the compressor 10, the flow path switching valve 11, the heat source side heat exchanger 12, and the accumulator 13 are mounted and connected through piping within the housing.
  • the compressor 10 takes in the heat source side refrigerant, compresses it, makes it high temperature and high pressure state, and discharges it.
  • the compressor 10 may be configured with, for example, a compressor whose capacity can be controlled.
  • the flow path switching valve 11 is a device that switches the flow path of the heat source side refrigerant depending on the cooling operation mode or the heating operation mode. When only cooling operation or heating operation is performed, there is no need to install the flow path switching valve 11.
  • the heat source side heat exchanger 12 exchanges heat between, for example, outdoor air supplied from the heat source side blower 14 and the heat source side refrigerant.
  • the heat source side heat exchanger 12 functions as an evaporator and causes the heat source side refrigerant to absorb heat.
  • the heat source side heat exchanger 12 functions as a condenser or a radiator in the cooling operation mode, and causes the heat source side refrigerant to radiate heat.
  • the heat source side refrigerant is made to radiate heat.
  • the accumulator 13 is provided on the heat source side of the compressor 10 on the refrigerant suction side.
  • the accumulator 13 stores surplus refrigerant that occurs, for example, during a difference in the amount of circulating refrigerant on the heat source side used between the heating operation mode and the cooling operation mode, or during a transition period when the operation changes.
  • the accumulator 13 may not be installed in the heat source side refrigerant circulation circuit A.
  • the indoor unit 3 is a unit that sends conditioned air to the indoor space.
  • Each indoor unit 3 of the first embodiment has an indoor heat exchanger 30 (indoor heat exchanger 30a to indoor heat exchanger 30c).
  • the indoor heat exchanger 30 is a device that constitutes the heat medium circulation circuit B.
  • Indoor heat exchanger 30 includes, for example, heat exchanger tubes and fins. Then, the heat medium passes through the heat transfer tubes of the indoor heat exchanger 30.
  • the indoor heat exchanger 30 exchanges heat between indoor air supplied from the indoor blower 31 and a heat medium. When a heat medium that is colder than the indoor air passes through the heat transfer tube, the air is cooled and the indoor space is cooled.
  • the indoor blower 31 (indoor blower 31a to indoor blower 31c) generates a flow of air that passes air from the indoor space to the indoor heat exchanger 30 and returns to the indoor space.
  • the indoor unit 3 may include an indoor flow rate adjustment device that controls the flow rate of the heat medium flowing into and out of the indoor heat exchanger 30.
  • the relay unit 2 is a unit that includes equipment related to heat transfer between the heat source side refrigerant circulating in the heat source side refrigerant circulation circuit A and the heat medium circulating in the heat medium circulation circuit B.
  • the relay unit 2 includes a heat medium heat exchanger 20, a pump 21, a throttle device 22, a bypass valve 23, a bypass pipe 24, a heat medium heat exchanger side pipe 25, a unit pipe 27, and a confluence section 26.
  • the heat medium heat exchanger 20 exchanges heat between the heat source side refrigerant and the heat medium, and transfers heat from the heat source side refrigerant side to the heat medium side.
  • the heat medium heat exchanger 20 functions as a condenser or a radiator, and causes the heat source side refrigerant to radiate heat.
  • the heat medium heat exchanger 20 functions as an evaporator and causes the heat source side refrigerant to absorb heat.
  • the pump 21 is a device that sucks the heat medium, pressurizes it, and circulates it through the heat medium circulation circuit B.
  • the expansion device 22 functions as a pressure reducing valve and an expansion valve, and is a device that reduces the pressure of the heat source side refrigerant and expands it.
  • the expansion device 22 is preferably a device such as an electronic expansion valve that can control the opening degree to an arbitrary size and can arbitrarily adjust the flow rate of the heat source side refrigerant.
  • the bypass pipe 24 is a pipe that bypasses the heat source side refrigerant that is about to pass through the heat medium heat exchanger 20.
  • the air conditioner according to the first embodiment allows the heat source side refrigerant to pass through the bypass pipe 24 and prevents the heat source side refrigerant from passing through the heat medium heat exchanger 20, particularly in the defrost operation.
  • Bypass valve 23 is installed in bypass piping 24 .
  • the bypass valve 23 allows the bypass piping 24 to pass or block the heat source side refrigerant.
  • the bypass valve 23 is an on-off valve such as a solenoid valve. As described later, the bypass valve 23 passes or blocks the heat source side refrigerant based on instructions from the control device 4.
  • the merging portion 26 is a portion where a plurality of pipes merge.
  • the merging section 26 in the first embodiment has, for example, a T-shaped pipe serving as a connecting pipe.
  • a bypass pipe 24, a heat medium heat exchanger side pipe 25, and a unit pipe 27 are connected to the connecting pipe.
  • the connecting pipe of the merging portion 26 may be a Y-shaped pipe or the like.
  • the heat medium heat exchanger side piping 25 is a pipe that is connected to the confluence section 26 and has one end connected to the heat medium heat exchanger 20 .
  • the unit piping 27 is a piping that is connected to the confluence section 26 and has one end connected to the refrigerant piping 5 outside the relay unit 2 .
  • the unit piping 27 becomes a compressor side piping that is indirectly connected to the compressor 10 of the outdoor unit 1 in the heat source side refrigerant circulation circuit A.
  • the unit piping 27 is connected to the heat source side refrigerant suction side of the compressor 10. Then, the heat source side refrigerant passes through the unit piping 27 from the confluence section 26 and flows out from the relay unit 2 .
  • the compressor 10 takes in the heat source side refrigerant, compresses it, makes it high temperature and high pressure state, and discharges it.
  • the discharged heat source side refrigerant flows into the heat source side heat exchanger 12 via the flow path switching valve 11 .
  • the heat source side heat exchanger 12 exchanges heat between the air supplied by the heat source side blower 14 and the heat source side refrigerant, and condenses and liquefies the heat source side refrigerant.
  • the condensed and liquefied heat source side refrigerant flows out of the outdoor unit 1, passes through the refrigerant pipe 5, flows into the relay unit 2, and passes through the throttle device 22.
  • the expansion device 22 reduces the pressure of the condensed and liquefied heat source side refrigerant passing therethrough.
  • the depressurized heat source side refrigerant flows into the heat medium heat exchanger 20 .
  • the heat medium heat exchanger 20 exchanges heat between the passing heat source side refrigerant and the heat medium, and evaporates and gasifies the heat source side refrigerant. At this time, the heat medium is cooled.
  • the heat source side refrigerant that has flowed out of the heat medium heat exchanger 20 flows out of the relay unit 2, passes through the refrigerant pipe 5, and flows into the outdoor unit 1. Then, the compressor 10 sucks in the heat source side refrigerant that has passed through the flow path switching valve 11 again and further passed through the accumulator 13 .
  • the compressor 10 takes in the heat source side refrigerant, compresses it, makes it high temperature and high pressure state, and discharges it.
  • the discharged heat source side refrigerant flows out of the outdoor unit 1 via the flow path switching valve 11, passes through the refrigerant pipe 5, and flows into the heat medium heat exchanger 20 of the relay unit 2.
  • the heat medium heat exchanger 20 exchanges heat between the passing heat source side refrigerant and the heat medium, and condenses and liquefies the heat source side refrigerant. At this time, the heat medium is heated.
  • the heat source side refrigerant flowing out from the heat medium heat exchanger 20 passes through the expansion device 22 .
  • the expansion device 22 reduces the pressure of the condensed and liquefied heat source side refrigerant passing therethrough.
  • the depressurized heat source side refrigerant flows out of the relay unit 2, passes through the refrigerant pipe 5, flows into the outdoor unit 1, and flows into the heat source side heat exchanger 12.
  • the heat source side heat exchanger 12 exchanges heat between the air supplied by the heat source side blower 14 and the heat source side refrigerant, and evaporates and gasifies the heat source side refrigerant. Then, the compressor 10 sucks in the heat source side refrigerant that has passed through the flow path switching valve 11 again and further passed through the accumulator 13 .
  • the heat source side blower 14 When performing the defrost operation, the heat source side blower 14 is stopped. Further, the throttle device 22 is in a closed state, and the bypass valve 23 is in an open state.
  • the compressor 10 takes in the heat source side refrigerant, compresses it, makes it high temperature and high pressure state, and discharges it.
  • the discharged heat source side refrigerant flows into the heat source side heat exchanger 12 via the flow path switching valve 11 .
  • the heat source side heat exchanger 12 exchanges heat between the frost attached to the heat source side heat exchanger 12 and the heat source side refrigerant.
  • the heat source side refrigerant condenses through heat exchange with the frost, and becomes a liquid or gas-liquid two-phase state.
  • the heat source side refrigerant flows out of the outdoor unit 1, passes through the refrigerant pipe 5, and flows into the relay unit 2.
  • the throttle device 22 is in the closed state and the bypass valve 23 is in the open state. Therefore, the heat source side refrigerant that has flowed into the relay unit 2 passes through the bypass pipe 24, the bypass valve 23, and the merging portion 26, and flows out from the relay unit 2.
  • the heat source side refrigerant flowing out from the relay unit 2 passes through the refrigerant pipe 5 and flows into the outdoor unit 1.
  • the liquid heat source side refrigerant is accumulated in the accumulator 13 .
  • the gaseous heat source side refrigerant is sucked into the compressor 10 .
  • FIG. 3 is a diagram showing an example of the configuration of the control device 4 included in the air conditioner according to the first embodiment.
  • the control device 4 performs processing related to the air conditioner based on physical quantity data included in signals sent from various sensors and signals such as instructions and settings sent from an input device (not shown).
  • the control device 4 includes a defrost determination section 40, a device control section 41, and a storage section 42.
  • the defrost determination unit 40 is based on the temperature of the heat source side refrigerant in the heat source side heat exchanger 12 detected by the heat source side heat exchanger temperature sensor 15 of the heat source side heat exchanger 12 in the outdoor unit 1 and a preset temperature. , determine whether to perform defrost operation.
  • the set temperature is a threshold value that is set in advance for the heat source side refrigerant outlet temperature and stored as data in the storage unit 42 in order to determine the necessity of the defrost operation.
  • the device control section 41 controls the outdoor unit 1, the relay unit 2, and the indoor units 3a to 3c based on the processing results performed by each section of the control device 4. In particular, in the first embodiment, the device control section 41 controls the outdoor unit 1 and the relay unit 2 when performing the defrost operation.
  • the storage unit 42 stores various data used when the control device 4 performs processing.
  • FIG. 4 is a diagram showing an example of a layout structure of piping through which the heat source side refrigerant passes within the relay unit 2 according to the first embodiment.
  • the arrows in FIG. 4 indicate the flow of the heat source side refrigerant during the defrost operation.
  • liquid or gas-liquid two-phase heat source side refrigerant passes through the relay unit 2 .
  • the throttle device 22 is in a closed state and the bypass valve 23 is in an open state.
  • the heat source side refrigerant then returns to the outdoor unit 1 via the bypass piping 24, passing through the confluence section 26a of the heat medium heat exchanger side piping 25 and the bypass piping 24.
  • each piping connection at the confluence part 26a in the relay unit 2 is the relationship shown in FIG. 4.
  • the bypass pipe 24 is connected to the confluence part 26a with its pipe axis in the horizontal direction.
  • the unit piping 27 has a pipe axis connected to the confluence portion 26a in a vertical direction (direction of gravity) from below (hereinafter referred to as vertically downward direction).
  • the pipe axis of the heat medium heat exchanger side pipe 25 is connected to the confluence part 26a in a vertical direction from above (hereinafter referred to as vertically upward direction).
  • each pipe and the confluence part 26a are connected horizontally or vertically, but each pipe does not need to be connected at 90 degrees. Any angle is sufficient as long as the liquid phase hot side source refrigerant does not pass through the heat medium heat exchanger side piping 25 and flow into the heat medium heat exchanger 20.
  • FIG. 5 is a diagram illustrating an example of the structure of the merging portion 26a according to the first embodiment.
  • the confluence section 26a as shown in FIG. 5 has a structure in which vertical piping is expanded. Therefore, in the connecting pipe of the merging portion 26a, the pipe on the side connected to the unit pipe 27 and the heat medium heat exchanger side pipe 25 has a wider cross-sectional area than the pipe on the side connected to the bypass pipe 24. Therefore, before the heat source side refrigerant flowing into the confluence section 26a from the bypass pipe 24 collides with the pipe wall of the confluence section 26a, the liquid phase heat source side refrigerant falls downward, and the liquid phase heat source side refrigerant falls downward.
  • the structure allows the side refrigerant to easily flow vertically downward to the outdoor unit 1.
  • FIG. 6 is a diagram illustrating another example of the structure of the merging portion 26a according to the first embodiment.
  • the confluence section 26a has a structure that functions as a gas-liquid separation device.
  • the confluence section 26a shown in FIG. 6 functions as a cyclone type gas-liquid separator and separates the gas phase and liquid phase of the heat source side refrigerant. Therefore, the confluence section 26a has a structure in which the gas phase heat source side refrigerant flows upward, and the liquid phase heat source side refrigerant flows downward (in the direction of gravity).
  • the bypass pipe 24, the heat medium heat exchanger side pipe 25, and the unit pipe 27 are connected at the confluence section 26a.
  • the heat medium heat exchanger side piping 25 is arranged so that the heat source side refrigerant does not flow from the heat medium heat exchanger side piping 25 into the heat medium heat exchanger side piping 25 so that the liquid phase hot side source refrigerant does not flow into the heat medium heat exchanger 20.
  • the tube axis is connected to the merging portion 26 in an upward direction than the horizontal direction.
  • the heat medium heat exchanger side pipe 25 is connected to the confluence part 26a with the pipe axis oriented vertically upward.
  • the liquid-phase hot-side source refrigerant flowing into the confluence portion 26 a flows backward through the heat medium heat exchanger side piping 25 and does not flow into the heat medium heat exchanger 20 . Therefore, it is possible to prevent the low temperature liquid phase hot source refrigerant from flowing into the heat medium heat exchanger 20, prevent the heat medium from freezing in the heat medium heat exchanger 20, and prevent the occurrence of freeze puncture. can.
  • FIG. 7 is a diagram showing a modification of the arrangement structure of the piping through which the heat source side refrigerant passes within the relay unit 2 according to the first embodiment.
  • the bypass pipe 24 is connected to the confluence part 26b with the pipe axis facing vertically downward.
  • the unit piping 27 is connected to the merging portion 26b with the pipe axis oriented in the horizontal direction.
  • the heat medium heat exchanger side pipe 25 is connected to the confluence part 26b with the pipe axis oriented vertically upward.
  • each pipe and the merging portion 26b are connected horizontally or vertically, but the pipes do not need to be connected at 90 degrees. Any angle is sufficient as long as the liquid phase hot side source refrigerant does not pass through the heat medium heat exchanger side piping 25 and flow into the heat medium heat exchanger 20.
  • FIG. 8 is a diagram showing another modification of the arrangement structure of the piping through which the heat source side refrigerant passes within the relay unit 2 according to the first embodiment.
  • the bypass pipe 24 is connected to the confluence part 26c with its pipe axis in the horizontal direction.
  • the unit piping 27 is connected to the merging portion 26c with the pipe axis oriented in the horizontal direction.
  • the heat medium heat exchanger side pipe 25 is connected to the confluence part 26c with the pipe axis oriented vertically upward.
  • the bypass piping 24 and the unit piping 27 have a straight piping connection relationship.
  • the connection between the merging portion 26c and each pipe in FIG. 8 is an example.
  • each pipe and the confluence part 26c are connected horizontally or vertically, but each pipe does not need to be connected at 90 degrees. Any angle is sufficient as long as the liquid phase hot side source refrigerant does not pass through the heat medium heat exchanger side piping 25 and flow into the heat medium heat exchanger 20.
  • FIG. 9 is a diagram showing another modified example of the arrangement structure of the piping through which the heat source side refrigerant passes within the relay unit 2 according to the first embodiment.
  • the bypass pipe 24 is connected to the confluence part 26d with the pipe axis facing vertically downward.
  • the unit piping 27 is connected to the merging portion 26d with the pipe axis oriented in the horizontal direction.
  • the heat medium heat exchanger side piping 25 is connected to the merging portion 26d with its tube axis inclined upward in the horizontal direction than the merging portion 26d.
  • the heat medium heat exchanger side piping 25 may be connected to the merging portion 26d in the horizontal direction, and may be arranged in an L-shape such that the pipe is oriented vertically upward with an inclination angle of 90 degrees.
  • the connection between the merging portion 26d and each pipe in FIG. 9 is an example.
  • each pipe and the confluence part 26d are connected horizontally or vertically, but each pipe does not need to be connected at 90 degrees. Any angle is sufficient as long as the liquid phase hot side source refrigerant does not pass through the heat medium heat exchanger side piping 25 and flow into the heat medium heat exchanger 20.
  • FIG. 10 is a diagram showing the configuration of an air conditioner according to the second embodiment.
  • devices with the same reference numerals as in FIG. 2 perform the same operations as in the first embodiment.
  • the air conditioner according to the second embodiment includes a refrigerant flow switching device 28 at the merging section 26 in the relay unit 2 described in the first embodiment.
  • the refrigerant flow switching device 28 has, for example, a three-way valve.
  • the refrigerant flow switching device 28 switches the flow paths to connect the bypass piping 24 or the heat medium heat exchanger side piping 25 and the unit piping 27, and switches the direction in which the heat source side refrigerant flows. As shown by the solid line in FIG. 10, the refrigerant flow switching device 28 switches the flow path so that the heat medium heat exchanger 20 and the outdoor unit 1 side communicate with each other when performing cooling operation or heating operation. Further, as shown by the broken line in FIG. 10, the refrigerant flow switching device 28 switches the flow paths so that the bypass pipe 24 and the unit pipe 27 communicate with each other when performing the defrost operation. Switching control of the refrigerant flow switching device 28 is performed by the control device 4.
  • the air conditioner according to the second embodiment has the refrigerant flow switching device 28, so that the bypass valve 23 and the heat medium heat exchanger side piping 25 are switched to communicate with each other during the defrost operation. However, it is cut off without communicating with the heat medium heat exchanger side piping 25. Therefore, for example, the heat source side refrigerant due to defrosting does not flow into the heat medium heat exchanger 20 via the heat medium heat exchanger side piping 25, and it is possible to prevent the heat source side refrigerant from stagnation and freezing of the heat medium.
  • FIG. 11 is a diagram showing the configuration of an air conditioner according to Embodiment 3.
  • devices and the like having the same reference numerals as in FIG. 1 and the like perform operations similar to those in the first embodiment or the second embodiment.
  • the air conditioner in Embodiment 3 has a plurality of relay units 2 described in Embodiment 1 or Embodiment 2.
  • the air conditioner has two units, a relay unit 2a and a relay unit 2b.
  • two relay units 2 are connected in parallel to the outdoor unit 1 through a refrigerant pipe 5 to form a heat source side refrigerant circulation circuit A.
  • the relay unit 2a and the indoor units 3a to 3c are connected by a heat medium pipe 6, thereby forming a heat medium circulation circuit B. Further, the relay unit 2b and the indoor units 3d to 3f are connected by a heat medium pipe 6, and a heat medium circulation circuit B is configured.
  • the piping connections within the relay units 2 described in Embodiment 1 or Embodiment 2 can be performed. For this reason, for example, the heat source side refrigerant due to defrost does not flow into the heat medium heat exchanger 20 via the heat medium heat exchanger side piping 25, and the heat source side refrigerant stagnates and the heat medium freezes, causing freeze punctures. It can be prevented.
  • FIG. 12 is a diagram showing the configuration of an air conditioner according to Embodiment 4.
  • devices with the same reference numerals as in FIG. 1 and the like operate in the same manner as in the first embodiment or the second embodiment.
  • the air conditioner in Embodiment 4 has an indoor unit 3a and a relay unit 2 connected in parallel to the outdoor unit 1 described in Embodiment 1 or 2 through refrigerant piping 5, so that the heat source side refrigerant This constitutes a circulation circuit A. Therefore, the indoor unit 3a in the fourth embodiment performs heat exchange between the heat source side refrigerant and the air in the indoor space. Even in an air conditioner having the indoor unit 3 in the heat source side refrigerant circulation circuit A as in the fourth embodiment, the piping connections within the relay unit 2 described in the first or second embodiment can be performed. can.
  • the heat source side refrigerant due to defrost does not flow into the heat medium heat exchanger 20 via the heat medium heat exchanger side piping 25, and the heat source side refrigerant stagnates and the heat medium freezes, causing freeze punctures. It can be prevented.
  • FIG. 13 is a diagram showing the configuration of an air conditioner according to Embodiment 5.
  • devices with the same reference numerals as in FIG. 2 and the like perform operations similar to those in the first embodiment.
  • the air conditioner in Embodiment 5 is configured by integrating the equipment in relay unit 2 described in Embodiment 1 into outdoor unit 1. Therefore, the air conditioner according to the fifth embodiment has a configuration in which the outdoor unit 1 and each indoor unit 3 are connected via heat medium piping 6.
  • the air conditioner according to the fourth embodiment allows the same piping connections as those in the relay unit 2 described in the first embodiment to be made within the outdoor unit 1, even if the relay unit 2 is not provided independently. It can be carried out. Therefore, the heat source side refrigerant due to defrosting does not flow into the heat medium heat exchanger 20, and it is possible to prevent the heat source side refrigerant from stagnation and freezing of the heat medium.
  • the outdoor unit 1 in Embodiment 5 has a configuration having a merging part 26, but instead of the merging part 26, it may have a configuration having the refrigerant flow switching device 28 described in Embodiment 2.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Compression-Type Refrigeration Machines With Reversible Cycles (AREA)

Abstract

Un climatiseur selon la présente invention comprend : un circuit de circulation de milieu chauffant ; et un circuit de circulation de fluide frigorigène côté source de chaleur, dans lesquels un compresseur pour comprimer un fluide frigorigène côté source de chaleur, un échangeur de chaleur côté source de chaleur qui échange de la chaleur entre le fluide frigorigène côté source de chaleur et l'air extérieur, un dispositif d'étranglement pour décompresser le fluide frigorigène côté source de chaleur, et un échangeur de chaleur de milieu chauffant qui échange de la chaleur entre le fluide frigorigène côté source de chaleur et un milieu chauffant sont reliés par des tuyaux de telle sorte que le fluide frigorigène côté source de chaleur circule à travers ceux-ci. Le circuit de circulation de fluide frigorigène côté source de chaleur comprend : un tuyau de dérivation à travers lequel le fluide frigorigène côté source de chaleur dirigé vers l'échangeur de chaleur de milieu chauffant est contourné ; une soupape de dérivation qui permet ou empêche l'écoulement du fluide frigorigène côté source de chaleur à travers le tuyau de dérivation ; et une partie de fusion à laquelle un tuyau côté échangeur de chaleur de milieu chauffant qui est relié à une extrémité à l'échangeur de chaleur de milieu chauffant, un tuyau côté compresseur qui est relié à une extrémité à un côté d'admission de fluide frigorigène côté source de chaleur du compresseur, et le tuyau de dérivation sont reliés. Au niveau de la partie de fusion, le tuyau côté échangeur de chaleur de milieu chauffant est relié au tuyau côté compresseur et au tuyau de dérivation de telle sorte que l'axe de celui-ci soit incliné vers le haut par rapport à l'horizontale ou est orienté verticalement vers le haut lorsqu'il est vu depuis la partie de fusion.
PCT/JP2022/011822 2022-03-16 2022-03-16 Climatiseur WO2023175757A1 (fr)

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006071244A (ja) * 2004-09-06 2006-03-16 Chantilly Home:Kk 室外機及びその設置構造
JP2006112672A (ja) * 2004-10-13 2006-04-27 Fujitsu General Ltd 冷凍装置のアキュムレータ
JP2017026248A (ja) * 2015-07-24 2017-02-02 株式会社ケーヒン・サーマル・テクノロジー 二重管式熱交換器
WO2017037788A1 (fr) * 2015-08-28 2017-03-09 三菱電機株式会社 Dispositif à cycle de réfrigération
JP2017053507A (ja) * 2015-09-07 2017-03-16 パナソニックＩｐマネジメント株式会社 空調システム、空調システムに用いる制御装置、プログラム
JP2021134935A (ja) * 2020-02-21 2021-09-13 三浦工業株式会社 給水加温システム

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006071244A (ja) * 2004-09-06 2006-03-16 Chantilly Home:Kk 室外機及びその設置構造
JP2006112672A (ja) * 2004-10-13 2006-04-27 Fujitsu General Ltd 冷凍装置のアキュムレータ
JP2017026248A (ja) * 2015-07-24 2017-02-02 株式会社ケーヒン・サーマル・テクノロジー 二重管式熱交換器
WO2017037788A1 (fr) * 2015-08-28 2017-03-09 三菱電機株式会社 Dispositif à cycle de réfrigération
JP2017053507A (ja) * 2015-09-07 2017-03-16 パナソニックＩｐマネジメント株式会社 空調システム、空調システムに用いる制御装置、プログラム
JP2021134935A (ja) * 2020-02-21 2021-09-13 三浦工業株式会社 給水加温システム

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