EP2896897B1 - Refrigeration cycle device - Google Patents

Refrigeration cycle device Download PDF

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Publication number
EP2896897B1
EP2896897B1 EP13836578.8A EP13836578A EP2896897B1 EP 2896897 B1 EP2896897 B1 EP 2896897B1 EP 13836578 A EP13836578 A EP 13836578A EP 2896897 B1 EP2896897 B1 EP 2896897B1
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EP
European Patent Office
Prior art keywords
refrigerant
refrigeration cycle
blow
chamber
cycle device
Prior art date
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Active
Application number
EP13836578.8A
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German (de)
English (en)
French (fr)
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EP2896897A4 (en
EP2896897A1 (en
Inventor
Masazumi Chisaki
Yasuhiro Suzuki
Hiroaki Makino
Hideaki Maeyama
Minoru Ishii
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Mitsubishi Electric Corp
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Mitsubishi Electric Corp
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Publication of EP2896897A1 publication Critical patent/EP2896897A1/en
Publication of EP2896897A4 publication Critical patent/EP2896897A4/en
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Classifications

    • 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
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D17/00—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces
    • F25D17/04—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces for circulating air, e.g. by convection
    • F25D17/06—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces for circulating air, e.g. by convection by forced circulation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
    • F24F1/06—Separate outdoor units, e.g. outdoor unit to be linked to a separate room comprising a compressor and a heat exchanger
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
    • F24F1/06—Separate outdoor units, e.g. outdoor unit to be linked to a separate room comprising a compressor and a heat exchanger
    • F24F1/20—Electric components for separate outdoor units
    • F24F1/24—Cooling of electric components
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
    • F24F1/06—Separate outdoor units, e.g. outdoor unit to be linked to a separate room comprising a compressor and a heat exchanger
    • F24F1/38—Fan details of outdoor units, e.g. bell-mouth shaped inlets or fan mountings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
    • F24F1/06—Separate outdoor units, e.g. outdoor unit to be linked to a separate room comprising a compressor and a heat exchanger
    • F24F1/46—Component arrangements in separate outdoor units
    • F24F1/48—Component arrangements in separate outdoor units characterised by air airflow, e.g. inlet or outlet airflow
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
    • F24F1/06—Separate outdoor units, e.g. outdoor unit to be linked to a separate room comprising a compressor and a heat exchanger
    • F24F1/56—Casing or covers of separate outdoor units, e.g. fan guards
    • 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
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D23/00—General constructional features

Definitions

  • the present disclosure relates to a refrigeration cycle device using a combustible refrigerant.
  • HFC refrigerants such as R410A are being used as refrigerant in refrigeration cycle devices.
  • HCFC hydrochlorofluorocarbon
  • R410A has an ozone depletion potential (ODP) of zero and does not damage the ozone layer, but R410A does have the property of a high global warming potential (GWP).
  • ODP ozone depletion potential
  • GWP global warming potential
  • HFC refrigerant with a low GWP is R32 (CH 2 F 2 ; difluoromethane).
  • HFC refrigerant similar to R32, but since the unsaturated hydrocarbons with a carbon double bond are called olefins, the O in olefin is often used to refer to these refrigerants as HFOs, to distinguish these refrigerants from HFC refrigerants that do not have a carbon double bond in their composition, such as R32.
  • Such low-GWP HFC refrigerants although not as readily combustible as HC refrigerants such as R290 (C 3 H 8 ; propane), do have a weakly combustible property, unlike the non-combustible R410A (hereinafter, refrigerants having a combustible property will be designated combustible refrigerants). For this reason, care is needed with respect to refrigerant leakage.
  • Patent Literature 1 for example, if a combustible refrigerant leaks and the combustible refrigerant accumulates in an electrical component box inside a machine chamber of an outdoor unit, a blower housed in a blowing chamber is made to operate before a compressor housed in the machine chamber is made to operate. Consequently, the combustible refrigerant accumulated inside the electrical component box of the machine chamber is forcibly discharged externally.
  • Patent Literature 1 Unexamined Japanese Patent Application Kokai Publication No. H11-94291 showing a refrigeration cycle device according to the preamble of claim 1.
  • the electrical component box is disposed in a top part inside the machine chamber. Also, a blow-through hole for discharging combustible refrigerant accumulated in the electrical component box is formed in a top part of a partition.
  • the combustible refrigerant is denser than air and has a greater specific weight, and thus leaking combustible refrigerant accumulates not only in the electrical component box, but also in the bottom part of the machine chamber.
  • the present invention has been devised in order to solve the above problem, and takes as an object to provide a highly safe refrigeration cycle device.
  • a refrigeration cycle device includes the features of claim 1.
  • outside air introduced from an introduction hole passes through a blow-through hole formed in a bottom part of a partition, and is sent outside a casing by a blower.
  • a blow-through hole formed in the bottom part of the partition, the combustible refrigerant is easily exhausted outside the casing together with the introduced outside air. Consequently, a highly safe refrigeration cycle device may be provided.
  • Embodiment 1 of the invention a refrigeration cycle device 10 according to Embodiment 1 will be described using FIGS. 1 to 8 .
  • a refrigeration cycle device 10 according to Embodiment 1 of the present invention is an air conditioner that provides air conditioning for an air-conditioned room by circulating refrigerant through a refrigeration cycle circuit 100, for example.
  • the refrigeration cycle device 10 is a separated type that includes an indoor machine 20 and an outdoor machine 30.
  • Embodiment 1 uses the HFC refrigerant R32 (CH 2 F 2 ; difluoromethane), which has a smaller global warming potential (GWP) and a comparatively smaller effect on global warming than the HFC refrigerant R410A widely being used in air conditioners today.
  • This R32 is a combustible refrigerant.
  • the refrigeration cycle device 10 includes, in addition to the indoor machine 20 and the outdoor machine 30, a controller that controls the refrigeration cycle circuit 100 and the like.
  • the indoor machine 20 is installed inside the air-conditioned room, and is equipped with an indoor heat exchanger 21 and a blower 22.
  • the indoor heat exchanger 21 cools or heats the air-conditioned room by exchanging heat between the refrigerant and the surrounding air.
  • the indoor heat exchanger 21 functions as an evaporator, and causes inflowing refrigerant to evaporate. Consequently, the indoor heat exchanger 21 absorbs heat from the air surrounding the indoor heat exchanger 21, and cools the surrounding air. By supplying this cooled air to the room, the air-conditioned room is cooled as a result.
  • the indoor heat exchanger 21 functions as a condenser, and causes inflowing gas refrigerant to condense. Consequently, the indoor heat exchanger 21 emits heat into the air surrounding the indoor heat exchanger 21, and heats the surrounding air. By supplying this heated air to the room, the air-conditioned room is heated as a result.
  • the blower 22 is installed near the indoor heat exchanger 21, and includes a blowing fan 22a and a fan motor 22b that rotates the blowing fan 22a. By the rotation of the blowing fan 22a, the blower 22 generates airflow that passes through the indoor heat exchanger 21. Subsequently, heat-exchanged air is supplied to the air-conditioned room by the generated airflow.
  • the type of blowing fan 22a of the blower 22 depends on the shape of the indoor machine 20. A cross-flow fan or turbofan may be used, for example.
  • the outdoor machine 30 is installed outdoors, and is equipped with a compressor 31, a four-way valve 32, an outdoor heat exchanger 33, an expansion valve 34, and a blower 35.
  • the compressor 31 is a device that compresses supplied refrigerant. As a result of being compressed by the compressor 31, refrigerant flowing in from a suction pipe 31a is changed into high temperature and high pressure gas refrigerant, Subsequently, the compressor 31 delivers the high temperature and high pressure refrigerant to the four-way valve 32 via a discharge pipe 31b. High temperature and high pressure gas refrigerant compressed by the compressor 31 continuously flows in the discharge pipe 31b. Meanwhile, low temperature and low pressure refrigerant flows in the suction pipe 31a. This low temperature and low pressure refrigerant is made up of gas refrigerant, or a two-phase refrigerant of gas refrigerant intermixed with a small quantity of liquid refrigerant. The compressor 31 is controlled by the controller.
  • the four-way valve 32 is provided downstream to the compressor 31.
  • the four-way valve 32 by switching the circulation direction of refrigerant inside the refrigeration cycle circuit 100, switches to one of a heating operation cycle and a cooling operation cycle.
  • the four-way valve 32 is controlled by the controller.
  • the outdoor heat exchanger 33 exchanges heat with air by evaporating or condensing inflowing refrigerant, thereby cooling or heating the air.
  • the outdoor heat exchanger 33 functions as a condenser, and causes inflowing refrigerant to condense.
  • the outdoor heat exchanger 33 functions as an evaporator, and causes inflowing refrigerant to evaporate.
  • the expansion valve 34 is a pressure reducing device with a variable opening degree.
  • the expansion valve 34 is made up of an electronically controlled expansion valve, for example. By causing inflowing refrigerant to expand, the expansion valve 34 reduces high pressure refrigerant to a low pressure. The expansion valve 34 then delivers the generated low pressure refrigerant.
  • the blower 35 is installed near the outdoor heat exchanger 33, and includes a blowing fan 35a and a fan motor 35b that rotates the blowing fan 35a. By the rotation of the blowing fan 35a, the blower 35 generates airflow that passes through the outdoor heat exchanger 33. Subsequently, heat-exchanged air is exhausted outdoors by the generated airflow.
  • a propeller fan that sucks air from the side or back is used for the blowing fan 35a of the blower 35.
  • the blower 35 also includes two blowing fans 35a. However, the configuration is not limited thereto, and the blower 35 may also include a number of blowing fans 35a other than two. For example, the blower 35 may also include one blowing fan 35a.
  • the refrigeration cycle circuit 100 is configured to include the indoor heat exchanger 21, the compressor 31, the four-way valve 32, the outdoor heat exchanger 33, the expansion valve 34, flow channels joining these members (a flow channel carrying refrigerant and including a suction pipe 31a and a discharge pipe 31b, as well as connecting pipes 11a and 11b), and the like.
  • FIG. 2 is a perspective view of the outdoor machine 30 of the refrigeration cycle device 10.
  • FIG. 3 is a perspective view of the outdoor machine 30 with part of the casing 40 removed from the state illustrated in FIG. 2 .
  • FIG. 4 is a cross-section along A-A in FIG. 2 . Note that the XY plane in the drawings is a horizontal plane, while the direction of the Z axis in the drawings is a vertical direction.
  • the outdoor machine 30 includes the above respective members (such as the compressor 31, the four-way valve 32, the outdoor heat exchanger 33, and the blower 35), as well as a casing 40 that houses these respective members.
  • the casing 40 is a member that configures the outer contour of the outdoor machine 30.
  • the casing 40 includes a top panel 41, a side panel 42, and front panels 43 and 44.
  • the top panel 41, the side panel 42, and the front panels 43 and 44 are formed by sheet-metal working, for example.
  • the top panel 41, the side panel 42, and the front panels 43 and 44 are preferably made up of a material with excellent fire resistance.
  • the top panel 41 configures the top face (the face on the +Z side) of the casing 40.
  • the side panel 42 is formed so that an XY cross-section thereof has an L-shape.
  • the side panel 42 configures the side face (the face on the +X side) and part of the back face (the face on the +Y side) of the casing 40.
  • Introduction holes 45 for introducing outside air are formed in the side panel 42.
  • the introduction holes 45 are made up of multiple rectangular holes. Specifically, the cross-sectional shape of each introduction hole 45 is a rectangle with the longer direction in the Y axis direction.
  • the length L1 in the shorter direction of the introduction holes 45 (the length in the Z axis direction) is predetermined on the basis of the quenching distance of the refrigerant.
  • the quenching distance is the dimension of a gap through which a flame is unable to propagate (the flame is extinguished). At this gap or less, the flame becomes unable to propagate. In other words, the flame becomes unable to pass through. This quenching distance differs according to the type of refrigerant.
  • the HFC refrigerant R32 is used for the refrigerant.
  • the quenching distance of R32 is 6 mm. Consequently, the introduction holes 45 are formed so that the length L1 in the shorter direction becomes 6 mm or less.
  • the length L1 in the shorter direction of the introduction holes 45 is set to 5.5 mm, for example.
  • the configuration is not limited thereto, and the length L1 of the introduction holes 45 may be a dimension other than 5.5 mm insofar as the length is 6 mm or less.
  • the introduction holes 45 are plurally formed at equal intervals along the Z axis direction.
  • the number of introduction holes 45 is 10, for example.
  • the number of holes is not limited thereto, and may also be a number other than 10.
  • the introduction holes 45 are formed at a position higher than the blow-through hole 51 formed in the partition plate 50 discussed later.
  • the front panel 43 is a plate-like member made of metal, and configures the front face (the face in the -Y direction) of the casing 40.
  • Blow-out openings 46 for air blown out from the blower 35 are formed in the front panel 43.
  • the blow-out openings 46 are formed in an approximately circular shape.
  • two blow-out openings 46 are formed, in correspondence with the installed number of blowing fans 35a of the blower 35.
  • Fan guards 47 having a mesh part for ensuring safety while the blowing fans 35a are operating are attached to the blow-out openings 46.
  • a tubular bell mouth 48 is formed, as illustrated in FIG. 4 .
  • the bell mouth 48 is integrally formed with the front panel 43.
  • the outer circumferential face of the bell mouth 48 is formed in a curved face.
  • the front panel 44 is formed so that an XY cross-section thereof has an L-shape, and configures the front face (the face on the -Y side) and part of the side face (the face on the +X side) of the casing 40.
  • these panels discussed above may be configured to be further disassembled, or several of these panels discussed above may be integrally formed.
  • the outdoor machine 30 includes a partition plate 50 (partition) that partitions the interior of the casing 40 into two spaces.
  • the partition plate 50 is formed extending in the vertical direction (+Z direction) from the floor of the casing 40.
  • the interior of the casing 40 is demarcated into a machine chamber M (first chamber) housing members such as the compressor 31 and electronic components for controlling the refrigeration cycle circuit 100, and a blowing chamber F (second chamber) housing members such as the blower 35.
  • the machine chamber M is formed on the +X side (the right side from a front view) of the casing 40, while the blowing chamber F is formed on the -X side (the left side from a front view) of the casing 40 interior.
  • the partition plate 50 is for preventing the intrusion of rainwater due to rainy weather and the like into the machine chamber M via the blowing chamber F.
  • blow-through holes 51 On the bottom (the edge on the -Z side) of the partition plate 50, blow-through holes 51 connecting from the machine chamber M to the blowing chamber F are formed.
  • the blow-through holes 51 are formed at a position lower than the introduction holes 45 of the casing 40.
  • the blow-through holes 51 are made up of multiple rectangular holes. Specifically, the cross-sectional shape of each blow-through hole 51 is a rectangle with the longer direction in the Y axis direction.
  • the length L2 in the shorter direction of the blow-through holes 51 (the length in the Z axis direction) is predetermined on the basis of the quenching distance of the refrigerant.
  • the quenching distance of R32 is 6 mm. Consequently, the blow-through holes 51 are formed so that the length L2 in the shorter direction becomes 6 mm or less.
  • the length L2 in the shorter direction of the blow-through holes 51 is set to 5.5 mm, for example.
  • the configuration is not limited thereto, and the length L2 of the blow-through holes 51 may be a dimension other than 5.5 mm insofar as the length is 6 mm or less.
  • blow-through holes 51 are plurally formed at equal intervals along the Z axis direction.
  • the number of blow-through holes 51 is 10, for example.
  • the number of holes is not limited thereto, and may also be a number other than 10.
  • blow-through holes 51 are formed to be covered by the bell mouth 48 and not exposed to the outside from the blow-out openings 46.
  • the compressor 31 is disposed inside the machine chamber M.
  • the compressor 31 is disposed on the floor of the machine chamber M via anti-vibration rubber or the like, for example.
  • the compressor 31 is a scroll compressor that includes a fixed spiral, and a movable spiral that revolves around the fixed spiral. This revolving decreases the volume of the compression chamber, and compresses the refrigerant.
  • the compressor 31 is not limited such a scroll compressor.
  • the compressor 31 may also be a rotary compressor in which a circular piston eccentrically rotates the internal space of a cylindrical cylinder, thereby decreasing the volume of the compression chamber formed between the inner circumferential face of the cylinder and the outer circumferential face of the piston, and compressing the refrigerant.
  • a compressor of a type other than a scroll compressor and a rotary compressor is also acceptable.
  • the four-way valve 32 and a refrigerant pipe group 36 are disposed on the top side (+Z side) of the compressor 31 disposed on the floor of the machine chamber M.
  • the refrigerant pipe group 36 is conducted to include members such as a refrigerant pipe connecting the connecting pipe 11a and the four-way valve 32, as well as the suction pipe 31a and discharge pipe 31b connected to the compressor 31, for example.
  • an electronic component box 61 housing multiple electronic components constituting the controller (such as a smoothing capacitor, for example), and a circuit board on which these electronic components are mounted, and the like.
  • the electronic component box 61 is formed at a position higher than the introduction holes 45 of the casing 40, in order to prevent the intrusion of rainwater and the like.
  • the electronic component box 61 is disposed so that the height of the bottom edge 61a (the edge on the -Z side) becomes the same height as the height of the top edge 45a of the introduction holes 45 (the top edge of the uppermost introduction hole 45 among the multiple introduction holes 45).
  • the electronic component box 61 is a case formed in an approximately cuboid shape.
  • a ventilation hole 62 is formed on the wall face on the +X side of the electronic component box 61.
  • a ventilation hole 63 is also formed on the wall face on the -X side of the electronic component box 61.
  • the ventilation hole 62 is used as an air inlet for cooling the electronic components, while the ventilation hole 63 is used as an air outlet.
  • blow-through holes 52 are formed on the top part (the edge on the +Z side) of the partition plate 50.
  • the blow-through holes 52 are formed facing opposite the ventilation hole 63 of the electronic component box 61. Air flowing out from the ventilation hole 63 of the electronic component box 61 passes through these blow-through holes 52.
  • the blow-through holes 52 are made up of multiple rectangular holes. Specifically, the cross-sectional shape of each blow-through hole 52 is a rectangle with the longer direction in the Y axis direction. Also, similarly to the blow-through holes 51, the length in the shorter direction of the blow-through holes 52 is also predetermined on the basis of the quenching distance of the refrigerant.
  • the blow-through holes 52 are plurally formed at equal intervals along the Z axis direction.
  • the number of blow-through holes 52 is 10, for example. However, the number of holes is not limited thereto, and may also be a number other than 10.
  • blowing chamber F members such as the outdoor heat exchanger 33 and the blower 35 are disposed.
  • the two blowing fans 35a of the blower 35 are disposed along the Z axis direction.
  • a fan motor 35b is attached to the back face of each blowing fan 35a.
  • the fan motors 35b are supported by a fan motor support plate 35c.
  • the fan motor support plate 35c is provided extending in the vertical direction (+Z direction) from the floor of the casing 40.
  • the outdoor heat exchanger 33 is disposed so as to cover the blower 35.
  • the outdoor heat exchanger 33 is formed so that an XY cross-section thereof has an L-shape, and is disposed so as to cover the back face (the face on the +Y side) and a side face (the side on the -X side) of the blower 35.
  • the controller is made up of an indoor machine control device of the indoor machine 20 and an outdoor machine control device of the outdoor machine 30, for example, and controls the operation of the refrigeration cycle device 10.
  • the controller controls the rotation of the blowing fans 22a and 35a by applying a voltage according to the number of revolutions of the blowing fans 22a and 35a of the blowers 22 and 35, for example.
  • the outdoor machine control device of the outdoor machine 30 is configured to include the electronic components housed in the electronic component box 61 discussed above.
  • the refrigerant flow channel of the indoor machine 20 and the refrigerant flow channel of the outdoor machine 30 are connected by the two connecting pipes 11a and 11b, as illustrated in FIG. 1 .
  • the connecting pipes 11a and 11b are connected to the respective flow channels of the indoor machine 20 and the outdoor machine 30 by flare nuts or the like, for example. Consequently, the refrigeration cycle circuit 100 is configured into a circuit that is sealed from the outside.
  • the refrigeration cycle device 10 configured as discussed above provides air conditioning for an air-conditioned room by conducting cooling operation, dehumidifying operation, heating operation, blowing operation, and the like.
  • Blowing operation is operation that supplies air using the blower 22 only, without operating the refrigeration cycle of the refrigeration cycle device 10.
  • Cooling operation, dehumidifying operation, and heating operation are operations that supply cool air and warm air using the blower 22 while also operating the refrigeration cycle.
  • the operation of the refrigeration cycle is the same for cooling operation and dehumidifying operation.
  • FIG. 1 operations of the refrigeration cycle will be described using FIG. 1 .
  • the solid arrows in FIG. 1 indicate the flow of refrigerant during cooling operation and dehumidifying operation.
  • the dashed arrows in FIG. 1 indicate the flow of refrigerant during heating operation.
  • the four-way valve 32 is switched to deliver refrigerant from the compressor 31 to the outdoor heat exchanger 33. Consequently, the refrigerant flows as indicated by the solid arrows in FIG. 1 .
  • the outdoor heat exchanger 33 functions as a condenser, while the indoor heat exchanger 21 functions as an evaporator.
  • the liquid refrigerant flows into the expansion valve 34, the liquid refrigerant expands due to the expansion valve 34. Subsequently, the liquid refrigerant is depressurized while the specific enthalpy remains constant, and the refrigerant changes to a low pressure state. At this point, the refrigerant becomes two-phase gas-liquid refrigerant in which gas refrigerant and liquid refrigerant are intermixed. This two-phase gas-liquid refrigerant is then sent out from the expansion valve 34.
  • the two-phase gas-liquid refrigerant sent out from the expansion valve 34 passes through the connecting pipe 11b, and flows into the refrigerant flow channel of the indoor machine 20. Subsequently, the refrigerant flows into the indoor heat exchanger 21 of the indoor machine 20.
  • the refrigerant evaporates due to the exchange of heat with the indoor air of the air-conditioned room supplied by the blower 22. Consequently, the specific enthalpy of the refrigerant rises, while the pressure remains constant. As a result, the refrigerant changes to high temperature and low pressure gas refrigerant in a heated state. Additionally, the heat-exchanged air is supplied to the room, and thus the indoor air is cooled. As a result, the room temperature of the air-conditioned room falls.
  • the gas refrigerant in a heated state sent out from the indoor heat exchanger 21 passes through the connecting pipe 11a, and flows into the refrigerant flow channel of the outdoor machine 30.
  • the refrigerant then flows into the compressor 31 again via the four-way valve 32 and the suction pipe 31a of the outdoor machine 30. Thereafter, the above refrigeration cycle is repeated.
  • the refrigeration cycle for dehumidifying operation is similar to the above refrigeration cycle for cooling operation.
  • the four-way valve 32 is switched to deliver refrigerant from the compressor 31 to the indoor heat exchanger 21. Consequently, the refrigerant flows as indicated by the dashed arrows in FIG. 1 .
  • the outdoor heat exchanger 33 functions as an evaporator, while the indoor heat exchanger 21 functions as a condenser.
  • the gas refrigerant sent out from the compressor 31 passes through the discharge pipe 31b and the four-way valve 32, and flows out from the outdoor heat exchanger 30. Subsequently, the refrigerant passes through the connecting pipe 11a and flows into the indoor heat exchanger 21.
  • the refrigerant condenses due to the exchange of heat with the indoor air of the air-conditioned room supplied by the blower 22. Consequently, the specific enthalpy of the refrigerant falls, while the pressure remains constant. As a result, the gas refrigerant changes to low temperature and high pressure liquid refrigerant in a supercooled state. Additionally, the heat-exchanged air is supplied to the room, and thus the indoor air is warmed. As a result, the room temperature of the air-conditioned room rises.
  • the liquid refrigerant in a supercooled state sent out from the indoor heat exchanger 21 passes through the connecting pipe 11b, and flows into the refrigerant flow channel of the outdoor machine 30. Subsequently, the refrigerant flows into the expansion valve 34 of the outdoor machine 30.
  • the liquid refrigerant When the liquid refrigerant flows into the expansion valve 34, the liquid refrigerant expands due to the expansion valve 34. Subsequently, the liquid refrigerant is depressurized while the specific enthalpy remains constant, and the refrigerant changes to a low temperature and low pressure state. At this point, the refrigerant becomes two-phase gas-liquid refrigerant in which gas refrigerant and liquid refrigerant are intermixed. This two-phase gas-liquid refrigerant is then sent out from the expansion valve 34. Subsequently, the refrigerant flows into the expansion valve 34 of the outdoor machine 30.
  • the two-phase gas-liquid refrigerant flows into the outdoor heat exchanger 33, the two-phase gas-liquid refrigerant condenses due to the exchange of heat with external air (outside air) supplied by the blower 35. Consequently, the specific enthalpy of the refrigerant rises, while the pressure remains constant. As a result, the two-phase gas-liquid refrigerant changes to high temperature and low pressure gas refrigerant in a heated state. This gas refrigerant is then sent out from the outdoor heat exchanger 33.
  • the gas refrigerant in a heated state sent out from the outdoor heat exchanger 33 flows into the compressor 31 again via the four-way valve 32 and the suction pipe 31a. Thereafter, the above refrigeration cycle is repeated.
  • the controller first causes the blowing fans 35a of the blower 35 of the outdoor machine 30 to rotate for a predetermined time.
  • the time to rotate the blowing fans 35a is stored in advance in memory of the controller. In Embodiment 1, the set time to rotate the blowing fans 35a is one minute.
  • blowing fans 35a are propeller fans, when the blowing fans 35a rotate, air is suctioned from the back face and lateral sides of the blowing fans 35a. Due to the suction of the blowing fans 35a, outside air of the outdoor machine 30 is introduced inside the machine chamber M from the introduction holes 45 of the casing 40, as indicated by the arrow W1 in FIG. 7 .
  • Air flowing into the electronic component box 61 passes through the interior of the electronic component box 61, as indicated by the arrow W3.
  • the airflow passing through the interior of the electronic component box 61 functions as cooling air that cools the circuit board that is producing heat. Air passing through the interior of the electronic component box 61 flows out from the ventilation hole 63. Subsequently, the air flowing out from the ventilation hole 63 flows into the blowing chamber F via the blow-through holes 52 of the partition plate 50, as indicated by the arrow W4.
  • combustible refrigerant may in some cases accumulate in the electronic component box 61.
  • the accumulated combustible refrigerant is exhausted from the ventilation hole 63 together with the air flowing into the electronic component box 61, and subsequently flows into the blowing chamber F via the blow-through holes 52 of the partition plate 50.
  • the airflow passing through the blow-through holes 52 functions as an airflow for exhausting combustible refrigerant.
  • the air flowing into the blowing chamber F is blown out from the blow-out openings 46 by the blowing fans 35a, as indicated by the arrows W8 and W9.
  • the exhausted combustible refrigerant dissipates outdoors and the refrigerant concentration goes outside the combustible range, and for this reason safety may be assured.
  • part of the air introduced into the machine chamber M also moves downward (-Z direction) inside the machine chamber M, as indicated by the arrow W5. If part of the air moves downward inside the machine chamber M, the air moves vertically down the length of the interior of the machine chamber M. Subsequently, the air passes through the vicinity of the compressor 31 and the like, as indicated by the arrow W6. Air passing through the vicinity of the compressor 31 and the like flows into the blowing chamber F via the blow-through holes 51 of the partition plate 50, as indicated by the arrow W7.
  • the combustible refrigerant being denser than air, accumulates at the floor of the machine chamber M.
  • the accumulated combustible refrigerant converges with the air indicated by the arrows W5 and W6 moving downward inside the machine chamber M.
  • the combustible refrigerant accumulated at the floor flows together with the air into the blowing chamber F via the blow-through holes 51 of the partition plate 50, as indicated by the arrow W7.
  • the airflow passing through the blow-through holes 51 functions as an airflow for exhausting combustible refrigerant.
  • the air flowing into the blowing chamber F is blown out from the blow-out openings 46 by the blowing fans 35a, as indicated by the arrows W8 and W9.
  • the exhausted combustible refrigerant dissipates outdoors and the refrigerant concentration goes outside the combustible range, and for this reason safety may be assured.
  • Embodiment 1 a conceivable time enabling combustible refrigerant accumulated in the machine chamber M or the electronic component box 61 to be completely exhausted.
  • this set time depends on factors such as the volume and shape of the machine chamber M and the electronic component box 61, the set time must be modified appropriately according to the configuration and model of the outdoor machine 30.
  • the controller of the refrigeration cycle device 10 switches the four-way valve 32 of the outdoor machine 30 according to the instructed operating mode (such as heating operation, cooling operation, or dehumidifying operation, for example).
  • the instructed operating mode such as heating operation, cooling operation, or dehumidifying operation, for example.
  • the refrigerant compressing operation of the compressor 31 is initiated by causing the revolving spiral of the compressor 31 to revolve. Consequently, refrigerant is circulated through the refrigeration cycle circuit 100. As a result, the instructed operating mode is initiated.
  • blow-through holes 51 are formed in the bottom part of the partition plate 50. For this reason, air introduced from the introduction holes 45 formed on the side panel 42 of the casing 40 passes through these blow-through holes 51, and is sent outside of the casing 40 by the blower 35. Consequently, even in a case in which refrigerant leaks out from the refrigeration cycle circuit 100 inside the machine chamber M and accumulates at the floor of the machine chamber M, combustible refrigerant is exhausted outside the casing 40 together with the introduced outside air.
  • the blow-through holes 51 are not formed in the bottom part of the partition plate 50 and only the blow-through holes 52 are formed in the top part of the partition plate 50, if refrigerant leaks out from the refrigeration cycle circuit 100 inside the machine chamber M, the combustible refrigerant, being denser than air, accumulates at the floor of the machine chamber M. Since the refrigerant accumulated at the floor must move upward (the direction opposing gravity) to pass through the blow-through holes 52 in the upper part by suction based on the rotation of the blowing fans 35a of the blower 35, exhausting all accumulated refrigerant from the machine chamber M is difficult.
  • the electronic components housed in the electronic component box 61 may potentially become an ignition source if powered on. For this reason, there is a risk that refrigerant moving upward may pass through near such a potential ignition source.
  • the blow-through holes 51 are formed in the bottom part of the partition plate 50, even if the refrigeration cycle device 10 is stopped, refrigerant may be exhausted from the blow-out openings 46 of the blowing chamber F on the basis of natural convection. Specifically, combustible refrigerant accumulated at the floor of the machine chamber M passes through the blow-through holes 51 formed in the bottom part over time by natural convection. It is then naturally exhausted from the blow-out openings 46 of the blowing chamber F. Consequently, in Embodiment 1, leaked combustible refrigerant becomes less likely to accumulate at the floor of the machine chamber M even while the refrigeration cycle device 10 is stopped, and the safety of the refrigeration cycle device 10 may be further increased.
  • the introduction holes 45 for introducing outside air are formed at a position higher than the blow-through holes 51. For this reason, outside air introduced from the introduction holes 45 flows vertically down the length of the interior of the machine chamber M from a high position to a low position, following gravity. Consequently, combustible refrigerant accumulated at the floor of the machine chamber M may be more smoothly exhausted outside the casing 40.
  • the introduction holes 45 are formed at a position lower than the electronic component box 61. For this reason, rainwater intruding from the introduction holes 45 is less likely to intrude into the electronic component box 61. As a result, failures of the electronic components housed in the electronic component box 61 may be prevented.
  • Embodiment 1 before starting operation of the refrigeration cycle, the blowing fans 35a of the blower 35 are rotated for a predetermined time. For this reason, even in a case in which combustible refrigerant has accumulated at the floor of the machine chamber M (around the compressor 31), the combustible refrigerant may be exhausted outside the casing 40 before starting operation of the refrigeration cycle. Consequently, combustible refrigerant may be removed from around the compressor 31 before the electrical components and electronic components included in the compressor 31 are powered on, and the safety of the refrigeration cycle device 10 may be increased.
  • part of the air introduced into the machine chamber M moves upward (+Z direction) inside the machine chamber M, and flows into the electronic component box 61. For this reason, the electronic components and circuit board inside the electronic component box 61 may be cooled.
  • Embodiment 1 part of the air introduced into the machine chamber M moves downward (-Z direction) inside the machine chamber M, and passes through the vicinity of the compressor 31 and the like. For this reason, in the case in which the refrigeration cycle is operating, temperature rises in the operating compressor 31 may be moderated. Consequently, decreases in the operating performance of the compressor 31 may be moderated.
  • part of the air introduced into the machine chamber M moves upward (+Z direction) inside the machine chamber M, and passes through the electronic component box 61.
  • part of the air introduced into the machine chamber M moves downward (-Z direction) inside the machine chamber M, and passes through the vicinity of the compressor 31 and the like. Consequently, cooling of the electronic components and circuit board inside the electronic component box 61 and moderation of temperature rises in the compressor 31 may be conducted at the same time.
  • the blow-through holes 51 formed in the bottom part of the partition plate 50 are covered by the bell mouth 48 so as to not be exposed from the blow-out openings 46 of the casing 40. Consequently, the intrusion of rainwater due to rainy weather and the like into the machine chamber M may be prevented. As a result, the electronic components in the electronic component box 61 as well as the compressor 31 disposed in the machine chamber M may be protected, and failures thereof may be prevented.
  • the length L2 in the shorter direction of the blow-through holes 51 of the partition plate 50 is predetermined on the basis of the quenching distance of the refrigerant. For this reason, even in the remote chance that combustible refrigerant accumulated inside the machine chamber M does ignite, the refrigerant flame is unable to pass through the blow-through holes 51, and thus the refrigerant flame does not leak outside the machine chamber M, nor does the refrigerant flame leak outside the casing 40. Also, after the combustible refrigerant acting as the source of the ignition fully burns out, the flame is naturally extinguished. Consequently, the safety of users of the refrigeration cycle device 10 may be ensured, and the safety of the refrigeration cycle device 10 may be increased.
  • the length L1 in the shorter direction of the introduction holes 45 in the side panel 42 of the casing 40 is also predetermined on the basis of the quenching distance of the refrigerant. For this reason, even in the remote chance that combustible refrigerant accumulated inside the machine chamber M does ignite, the refrigerant flame is unable to pass through the introduction holes 45, and thus the refrigerant flame does not leak outside the casing 40. Consequently, the safety of users of the refrigeration cycle device 10 may be ensured, and the safety of the refrigeration cycle device 10 may be increased.
  • Embodiment 1 of the present invention thus describes Embodiment 1 of the present invention, but the present disclosure is not limited to the above Embodiment 1.
  • the HFC refrigerant R32 (CH 2 F 2 ; difluoromethane) is used as the refrigerant.
  • the refrigerant is not limited thereto.
  • the refrigerant may also be a strongly combustible refrigerant such as R290 (propane).
  • the refrigerant may also be a mixed refrigerant of the above.
  • combustible refrigerants include all refrigerants having a possibility of combustion, from weakly combustible refrigerants to strongly combustible refrigerants.
  • the introduction holes 45 for introducing outside air are formed so that the height of the top edge 45a becomes the same height as the height of the bottom edge 61a of the electronic component box 61, as illustrated in FIG. 7 .
  • the configuration is not limited thereto.
  • the introduction holes 45 may also be formed at a position higher than the blow-through holes 51 formed in the partition plate 50, and formed at a position lower than the electronic component box 61.
  • the outside air introduced from the introduction holes 45 more easily flows vertically down the length of the interior of the machine chamber M from a high position to a low position, following gravity.
  • the introduction holes 45 are preferably formed at as high a position as possible. Furthermore, in order to prevent the intrusion of rainwater into the electronic component box 61, the introduction holes 45 are preferably formed at a position lower than the electronic component box 61. Specifically, it is most preferable for the height of the top edge 45a of the introduction holes 45 to be the same height as the height of the bottom edge 61a of the electronic component box 61, so that the introduction holes 45 are positioned directly below the electronic component box 61, as illustrated in FIG. 7 .
  • the blow-through holes 51 connecting from the machine chamber M to the blowing chamber F are formed in the bottom part of the partition plate 50, as illustrated in FIG. 7 .
  • the blow-through holes 51 are formed near the bottom edge of the partition plate 50.
  • the bottom part of the partition plate 50 indicates the side below the middle position of the partition plate 50 in the Z axis direction. Consequently, if the blow-through holes 51 are positioned below the middle position of the partition plate 50, the blow-through holes 51 may also be formed at a position other than the position illustrated in FIG. 7 .
  • the position where the blow-through holes 51 are formed is preferably as low a position as possible.
  • the position where the blow-through holes 51 are formed is at the bottommost edge of the partition plate 50, water accumulated in the blowing chamber F due to rainy weather or the like becomes more likely to flow backward into the machine chamber M.
  • the bottom edge of the blow-through holes 51 it is most preferable for the bottom edge of the blow-through holes 51 to be at a position several centimeters (for example, 1 cm to 3 cm) higher than the floor of the machine chamber M and blowing chamber F.
  • the blow-through holes 51 of the partition plate 50 are formed so that a YZ cross-section thereof becomes a rectangular shape, as illustrated in FIG. 6 .
  • the configuration is not limited thereto, and insofar as the shortest dimension of the blow-through holes 51 is predetermined on the basis of the quenching distance, the blow-through holes 51 may also be formed with a cross-section in a shape other than a rectangle.
  • the blow-through holes 51 may also be formed so that a YZ cross-section thereof becomes a circular hole shape. In this case, the diameter D1 of the circular hole shape becomes 6 mm or less, on the basis of the quenching distance of the R32 being used as the refrigerant.
  • the blow-through holes 51 may also be formed so that a YZ cross-section thereof becomes an elliptical shape.
  • the minor dimension L3 of the elliptical shape becomes 6 mm or less, on the basis of the quenching distance of the R32 being used as the refrigerant.
  • the cross-section of the blow-through holes 51 may be an oval shape, or a shape other than the above (rectangular shape, circular shape, elliptical shape, oval shape).
  • the cross-sectional shape of the blow-through holes 51 is specifically described as not being limited to a rectangular shape as indicated in the above Embodiment 1, the cross-sectional shape of the introduction holes 45 formed in the side panel 42 of the casing 40 is also similar.
  • the introduction holes 45 are formed so that a YZ cross-section thereof becomes a rectangular shape, as illustrated in FIG. 5 .
  • the configuration is not limited thereto, and insofar as the shortest dimension of the blow-through holes 51 is predetermined on the basis of the quenching distance, the introduction holes 45 may also be formed with a cross-section in a shape other than a rectangle.
  • the introduction holes 45 may also be formed so that a YZ cross-section thereof becomes a circular hole shape.
  • the diameter of the circular hole shape becomes 6 mm or less, on the basis of the quenching distance of the R32 used in the embodiments.
  • the introduction holes 45 may also be formed so that a YZ cross-section thereof becomes an elliptical shape.
  • the minor dimension of the elliptical shape becomes 6 mm or less, on the basis of the quenching distance of the R32 used in the embodiments.
  • the cross-section of the blow-through holes 51 may be an oval shape, or a shape other than the above (rectangular shape, circular shape, elliptical shape, oval shape).
  • screens 71 formed to cover the openings on the -X side may also be provided.
  • the screens 71 cover the front side (-X side), top side (+Z side), and lateral sides (+Y side and -Y side) of the blow-through holes 51, for example.
  • the openings of the blow-through holes 51 are substantially formed to face downward (-Z direction).
  • the screens 71 may be integrally formed with the partition plate 50, or separately formed and later attached to the partition plate 50.
  • screens 72 formed to cover the openings on the +X side may also be provided on the introduction holes 45 formed in the side panel 42 of the casing 40.
  • the screens 72 cover the front side (+X side), top side (+Z side), and lateral sides (+Y side and -Y side) of the introduction holes 45, for example.
  • the openings of the introduction holes 45 are substantially formed to face downward (-Z direction).
  • the screens 72 may be integrally formed with the side panel 42, or separately formed and later attached to the side panel 42.
  • Embodiments 1 to 6 describe an example of using the refrigeration cycle device 10 in an air conditioner, the refrigeration cycle device 10 is also applicable to other equipment, such as the heat source machine of a water heater.
  • a refrigeration cycle device of the present disclosure is suitable for providing air conditioning.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Other Air-Conditioning Systems (AREA)
  • Devices That Are Associated With Refrigeration Equipment (AREA)
  • Air Conditioning Control Device (AREA)
  • Cold Air Circulating Systems And Constructional Details In Refrigerators (AREA)
EP13836578.8A 2012-09-12 2013-08-02 Refrigeration cycle device Active EP2896897B1 (en)

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JP2012200380A JP5805598B2 (ja) 2012-09-12 2012-09-12 冷凍サイクル装置
PCT/JP2013/071014 WO2014041920A1 (ja) 2012-09-12 2013-08-02 冷凍サイクル装置

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MX360031B (es) 2018-10-19
WO2014041920A1 (ja) 2014-03-20
JP2014055705A (ja) 2014-03-27
ES2935032T3 (es) 2023-03-01
JP5805598B2 (ja) 2015-11-04
CN105674430B (zh) 2019-05-03
AU2013317055B2 (en) 2016-03-03
EP2896897A4 (en) 2016-08-03
CN103673095B (zh) 2017-01-11
US20150204599A1 (en) 2015-07-23
EP2896897A1 (en) 2015-07-22
MX2015003248A (es) 2015-06-10
CN203478432U (zh) 2014-03-12
CN103673095A (zh) 2014-03-26
CN105674430A (zh) 2016-06-15

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