WO2014041920A1 - 冷凍サイクル装置 - Google Patents

冷凍サイクル装置 Download PDF

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Publication number
WO2014041920A1
WO2014041920A1 PCT/JP2013/071014 JP2013071014W WO2014041920A1 WO 2014041920 A1 WO2014041920 A1 WO 2014041920A1 JP 2013071014 W JP2013071014 W JP 2013071014W WO 2014041920 A1 WO2014041920 A1 WO 2014041920A1
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WO
WIPO (PCT)
Prior art keywords
refrigeration cycle
refrigerant
chamber
blower
hole
Prior art date
Application number
PCT/JP2013/071014
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
正純 知崎
康巨 鈴木
牧野　浩招
英明 前山
稔 石井
Original Assignee
三菱電機株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 三菱電機株式会社 filed Critical 三菱電機株式会社
Priority to MX2015003248A priority Critical patent/MX360031B/es
Priority to US14/416,712 priority patent/US20150204599A1/en
Priority to EP13836578.8A priority patent/EP2896897B1/en
Priority to AU2013317055A priority patent/AU2013317055B2/en
Priority to ES13836578T priority patent/ES2935032T3/es
Publication of WO2014041920A1 publication Critical patent/WO2014041920A1/ja

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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
    • 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
    • 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
    • F24F1/56—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 invention relates to a refrigeration cycle apparatus using a combustible refrigerant.
  • HFC Hydrofluoro-Carbon refrigerants
  • R410A Hydrofluoro-Fluoro-Carbon refrigerants
  • ODP Ozone Depletion Potential
  • GWP Global Warming Potential
  • R32 (CH 2 F 2 ; difluoromethane) is a candidate for a low GWP HFC refrigerant.
  • HFO-1234yf CF 3 CF ⁇ CH 2 ; tetrafluoropropane
  • HFO refrigerants are not as flammable as HC refrigerants such as R290 (C 3 H 8 ; propane), they are slightly inflammable unlike R410A, which is nonflammable. It has combustibility (hereinafter, a combustible refrigerant is referred to as a combustible refrigerant). Therefore, attention to refrigerant leakage is necessary.
  • Patent Document 1 when the combustible refrigerant leaks and the combustible refrigerant stays in the electrical component box in the machine room of the outdoor unit, the compressor accommodated in the machine room is operated. Before, the blower accommodated in the ventilation chamber is operated. As a result, the combustible refrigerant staying in the electrical component box of the machine room is forcibly discharged to the outside.
  • the electrical component box is disposed in the upper part of the machine room.
  • coolant which accumulated in the electrical component box is formed in the upper part of a partition part. Since the combustible refrigerant generally has a higher density and a higher specific gravity than air, the leaked combustible refrigerant stays not only in the electric component box but also in the bottom of the machine room. However, in the refrigeration cycle apparatus described in Patent Document 1, a flammable refrigerant having a specific gravity greater than that of air staying in a place other than the electric component box, for example, the bottom of the machine room, is passed through the ventilation hole to the outside. It is physically difficult to discharge. For this reason, it is necessary to further improve safety.
  • the present invention has been made to solve the above-described problems, and an object thereof is to provide a highly safe refrigeration cycle apparatus.
  • the refrigeration cycle apparatus includes a casing, a partition, a refrigeration cycle circuit, and a blower.
  • the casing constitutes an outer shell of the outdoor unit, and a first chamber and a second chamber are formed therein, and an introduction hole for introducing outside air into the first chamber is formed.
  • the partition section partitions the interior of the housing into a first chamber and a second chamber, and a ventilation hole communicating from the first chamber to the second chamber is formed in the lower portion.
  • At least a part of the refrigeration cycle circuit is disposed in the first chamber, and the combustible refrigerant flows back.
  • the blower is arranged in the second chamber, and sends outside air introduced from the introduction hole to the outside of the casing through the vent hole formed in the second chamber.
  • the outside air introduced from the introduction hole passes through the ventilation hole formed in the lower part of the partition part, and is sent out of the casing by the blower. For this reason, for example, even when a flammable refrigerant having a specific gravity greater than that of air leaks from the refrigeration cycle circuit and stays at the bottom of the first chamber, the vent hole is formed at the lower part of the partition part, so that it is flammable.
  • the refrigerant is easily discharged to the outside of the housing together with the introduced outside air. Therefore, a highly safe refrigeration cycle apparatus can be provided.
  • FIG. 1 is a configuration diagram of a refrigeration cycle apparatus according to Embodiment 1 of the present invention. It is a perspective view of the outdoor unit of a refrigeration cycle apparatus. It is a perspective view of the outdoor unit which removed a part of housing
  • FIG. 3 is a cross-sectional view taken along line AA in FIG. 2. It is a perspective view of the introduction hole formed in the side panel of a housing
  • FIG. 2 It is a schematic diagram of the outdoor unit of the refrigeration cycle apparatus according to Embodiment 2 of the present invention. It is a perspective view of the ventilation hole formed in the partition plate of the refrigerating-cycle apparatus which concerns on Embodiment 3 of this invention. It is a front view of the ventilation hole formed in the partition plate of the refrigerating-cycle apparatus which concerns on Embodiment 4 of this invention. It is a perspective view of the ventilation hole formed in the partition plate of the refrigerating-cycle apparatus which concerns on Embodiment 5 of this invention. It is a perspective view of the introduction hole formed in the housing
  • Embodiment 1 FIG.
  • the refrigeration cycle apparatus 10 according to the first embodiment will be described with reference to FIGS.
  • the refrigeration cycle apparatus 10 is an air conditioner that performs air conditioning in a room to be air conditioned, for example, when a refrigerant recirculates to the refrigeration cycle circuit 100.
  • the refrigeration cycle apparatus 10 is a separate type having an indoor unit 20 and an outdoor unit 30.
  • the refrigerant is an HFC refrigerant that has a global warming potential (GWP) that is smaller than that of the HFC refrigerant R410A that is currently widely used in air conditioners and that has a relatively low impact on global warming.
  • GWP global warming potential
  • R32 CH 2 F 2 : difluoromethane
  • the refrigeration cycle apparatus 10 includes a control unit that controls the refrigeration cycle circuit 100 and the like.
  • the indoor unit 20 is installed in a room subject to air conditioning, and includes an indoor heat exchanger 21 and a blower 22.
  • the indoor heat exchanger 21 cools or warms the air-conditioned room by exchanging heat between the refrigerant and the surrounding air.
  • the indoor heat exchanger 21 functions as an evaporator to evaporate the refrigerant that has flowed. Thereby, the indoor heat exchanger 21 absorbs heat from the air around the indoor heat exchanger 21 and cools the surrounding air. By supplying this cooled air into the room, as a result, the room to be air conditioned is cooled.
  • the indoor heat exchanger 21 functions as a condenser and condenses the inflowing gaseous refrigerant. Thereby, the indoor heat exchanger 21 releases heat to the air around the indoor heat exchanger 21, and warms the surrounding air. By supplying this warmed air to the room, the room to be air-conditioned is warmed as a result.
  • the blower 22 is installed in the vicinity of the indoor heat exchanger 21, and has a blower fan 22a and a fan motor 22b that rotates the blower fan 22a.
  • the blower 22 generates an air flow that passes through the indoor heat exchanger 21 by the rotation of the blower fan 22a. Then, the heat-exchanged air is supplied into the air-conditioned room by the generated air flow.
  • the type of the blower fan 22a of the blower 22 depends on the form of the indoor unit 20, and for example, a cross flow fan or a turbo fan is used.
  • the outdoor unit 30 is installed outdoors and includes 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 the supplied refrigerant.
  • the compressor 31 changes the refrigerant flowing in from the suction pipe 31a into a high-temperature and high-pressure gas refrigerant by compressing the refrigerant. Then, the compressor 31 sends the high-temperature and high-pressure refrigerant to the four-way valve 32 via the discharge pipe 31 b of the compressor 31.
  • the high-temperature and high-pressure gas refrigerant compressed by the compressor 31 always flows through the discharge pipe 31b.
  • a low-temperature and low-pressure refrigerant flows through the suction pipe 31a.
  • the low-temperature and low-pressure refrigerant is composed of a gas refrigerant or a two-phase refrigerant in which a small amount of liquid refrigerant is mixed with the gas refrigerant.
  • the compressor 31 is controlled by the control unit.
  • the four-way valve 32 is provided on the downstream side of the compressor 31.
  • the four-way valve 32 switches between the heating operation cycle and the cooling operation cycle by switching the recirculation direction of the refrigerant in the refrigeration cycle circuit 100.
  • the four-way valve 32 is controlled by the control unit.
  • the outdoor heat exchanger 33 exchanges heat with air by evaporating or condensing the inflowing refrigerant to cool or heat the air.
  • the outdoor heat exchanger 33 functions as a condenser to condense the refrigerant that has flowed in.
  • the outdoor heat exchanger 33 functions as an evaporator and evaporates the refrigerant that has flowed in.
  • the expansion valve 34 is a pressure reducing device whose opening degree can be changed.
  • the expansion valve 34 is composed of, for example, an electronically controlled expansion valve.
  • the expansion valve 34 expands the refrigerant that has flowed in, thereby reducing the high-pressure refrigerant to a low pressure. Then, the expansion valve 34 delivers the generated low-pressure refrigerant.
  • the blower 35 is installed in the vicinity of the outdoor heat exchanger 33, and has a blower fan 35a and a fan motor 35b that rotates the blower fan 35a.
  • the blower 35 generates an air flow that passes through the outdoor heat exchanger 33 by the rotation of the blower fan 35a. And the air heat-exchanged with the produced
  • sucks air from the back surface or the side is used for the ventilation fan 35a of the air blower 35.
  • the blower 35 has two blower fans 35a.
  • the present invention is not limited thereto, and the blower 35 may have a number of blower fans 35a other than two.
  • the blower 35 may have one blower fan 35a.
  • the refrigeration cycle circuit 100 includes an indoor heat exchanger 21, a compressor 31, a four-way valve 32, an outdoor heat exchanger 33, an expansion valve 34, and a flow path (an intake pipe 31a and a discharge pipe 31b) connecting them. Including a flow path through which the refrigerant flows, connection pipes 11a and 11b), and the like.
  • FIG. 2 is a perspective view of the outdoor unit 30 of the refrigeration cycle apparatus 10.
  • FIG. 3 is a perspective view of the outdoor unit 30 with a part of the housing 40 removed from the state shown in FIG. 4 is a cross-sectional view taken along the line AA in FIG.
  • the XY plane in the figure is a horizontal plane, and the direction of the Z axis in the figure is the vertical direction.
  • the outdoor unit 30 is a housing that accommodates these members in addition to the above-described members (compressor 31, four-way valve 32, outdoor heat exchanger 33, blower 35, etc.). 40.
  • the housing 40 is a member that constitutes the outline of the outdoor unit 30 as shown in FIG.
  • the housing 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 processing, for example.
  • the top panel 41, the side panel 42, and the front panels 43 and 44 are preferably made of a material excellent in fire resistance.
  • the top panel 41 constitutes the upper surface (the surface on the + Z side) of the housing 40.
  • the side panel 42 is formed so that the XY cross section is substantially L-shaped.
  • the side panel 42 constitutes a side surface (+ X side surface) and a part of the back surface (+ Y side surface) of the housing 40.
  • the side panel 42 is formed with an introduction hole 45 for introducing outside air.
  • the introduction hole 45 is composed of a plurality of rectangular holes.
  • the cross-sectional shape of each introduction hole 45 is a rectangular shape whose longitudinal direction is the Y-axis direction.
  • a length L1 (length in the Z-axis direction) in the short direction of the introduction hole 45 is defined based on the extinction distance of the refrigerant.
  • the extinguishing distance is a dimension of a gap where the flame cannot propagate (the flame disappears), and the flame cannot propagate when the gap is less than this gap. That is, the flame cannot pass through. This extinguishing distance varies depending on the type of refrigerant.
  • the introduction hole 45 is formed so that the length L1 in the short direction is 6 mm or less.
  • the length L1 in the short direction of the introduction hole 45 is set to 5.5 mm, for example.
  • the present invention is not limited to this, and the length L1 of the introduction hole 45 may be a dimension other than 5.5 mm as long as it is 6 mm or less.
  • a plurality of introduction holes 45 are formed at equal intervals along the Z-axis direction.
  • the number of introduction holes 45 is 10, for example. However, the number of holes is not limited to this and may be other than ten. However, if the number of holes is too small, the total cross-sectional area of the introduction holes 45 is too small, the ventilation resistance is increased, and air is not easily circulated. Therefore, it is desirable to form the number of holes around 10 so that air can flow smoothly.
  • the introduction hole 45 is formed at a position higher than a ventilation hole 51 formed in the partition plate 50 described later.
  • the front panel 43 is a plate-shaped member made of metal and constitutes the front surface (the surface on the ⁇ Y side) of the housing 40.
  • the front panel 43 is formed with an air outlet 46 for blowing air from the blower 35.
  • the blower outlet 46 is formed in a substantially circular shape. Further, two air outlets 46 are formed corresponding to the number of blower fans 35 a of the blower 35 installed.
  • a fan guard 47 having a mesh portion for ensuring safety when the blower fan 35a is operating is attached to the blower outlet 46.
  • a cylindrical bell mouth 48 is formed inside each of the air outlets 46 of the front panel 43.
  • the bell mouth 48 is formed integrally with the front panel 43.
  • the outer peripheral surface of the bell mouth 48 is formed to be a curved surface.
  • the front panel 44 is formed so that the XY cross section is substantially L-shaped, and constitutes the front surface (the surface on the ⁇ Y side) and a part of the side surface (the surface on the + X side).
  • these panels (the top panel 41, the side panel 42, the front panels 43, 44, etc.) described above may be configured to be more finely disassembled. It may be integrally formed.
  • the outdoor unit 30 has a partition plate 50 (partition section) that partitions the inside of the housing 40 into two spaces.
  • the partition plate 50 is formed so as to extend from the bottom surface of the housing 40 in the vertical direction (+ Z direction).
  • the inside of the housing 40 accommodates the compressor 31, the machine room M (first chamber) in which electronic parts for controlling the refrigeration cycle circuit 100 are accommodated, the blower 35, and the like. It is partitioned into a blower chamber F (second chamber).
  • the machine room M is formed on the + X side (right side in a front view) of the casing 40, and the blower chamber F is formed on the ⁇ X side (left side in a front view) inside the casing 40.
  • the partition plate 50 is for preventing rainwater such as wind and rain from entering the machine room M through the blower chamber F. Ventilation holes 51 that lead from the machine room M to the blower room F are formed in the lower part (end on the ⁇ Z side) of the partition plate 50. The ventilation hole 51 is formed at a position lower than the introduction hole 45 of the housing 40.
  • the length L2 in the short direction of the ventilation hole 51 is set to 5.5 mm, for example.
  • the present invention is not limited to this, and the length L2 of the ventilation hole 51 may be a dimension other than 5.5 mm as long as it is 6 mm or less.
  • a plurality of ventilation holes 51 are formed at equal intervals along the Z-axis direction.
  • the number of holes of the vent hole 51 is 10, for example.
  • the number of holes is not limited to this and may be other than ten.
  • the ventilation hole 51 is formed so as to be covered by the bell mouth 48 so as not to be exposed to the outside from the air outlet 46.
  • a compressor 31 is arranged as shown in FIG.
  • the compressor 31 is arrange
  • the compressor 31 is a scroll compressor that has a fixed vortex portion and a movable vortex portion that swirls with respect to the fixed vortex portion, and compresses the refrigerant by reducing the volume of the compression chamber by the swirling motion.
  • the compressor 31 is not limited to such a scroll compressor.
  • the compressor 31 reduces the volume of the compression chamber formed between the inner circumferential surface of the cylinder and the outer circumferential surface of the piston by rotating the circular piston eccentrically in the inner space of the cylindrical cylinder.
  • a rotary compressor that compresses the refrigerant may be used.
  • a compressor other than the scroll compressor and the rotary compressor may be used.
  • the refrigerant pipe group 36 includes, for example, a refrigerant pipe connecting the connection pipe 11a and the four-way valve 32, an intake pipe 31a connected to the compressor 31, a discharge pipe 31b, and the like.
  • an electronic component box 61 that houses a plurality of electronic components (for example, a smoothing capacitor) constituting the control unit and a mounting board on which these electronic components are mounted.
  • the electronic component box 61 is formed at a position higher than the introduction hole 45 of the housing 40 in order to prevent intrusion of rainwater or the like.
  • the electronic component box 61 has a lower end 61a ( ⁇ Z side end) whose height is the upper end 45a of the introduction hole 45 (the upper end of the uppermost introduction hole 45 among the plurality of introduction holes 45). It arrange
  • the electronic component box 61 is a case formed in a substantially rectangular parallelepiped shape.
  • a vent hole 62 is formed on the wall surface of the electronic component box 61 on the + X side. Further, as shown in FIG. 7, a vent hole 63 is also formed on the wall surface on the ⁇ X side of the electronic component box 61.
  • the vent hole 62 is used as an air inlet for cooling the electronic component, and the vent hole 63 is used as an air outlet.
  • a ventilation hole 52 is formed in the upper part (the end on the + Z side) of the partition plate 50.
  • the ventilation hole 52 is formed so as to face the ventilation hole 63 of the electronic component box 61.
  • the air flowing out from the vent hole 63 of the electronic component box 61 passes through the ventilation hole 52.
  • the ventilation hole 52 is composed of a plurality of rectangular holes, like the ventilation hole 51 formed in the lower part.
  • the cross-sectional shape of each of the ventilation holes 52 is a rectangular shape whose longitudinal direction is the Y-axis direction.
  • the length in the short direction of the ventilation hole 52 is defined based on the extinction distance of the refrigerant.
  • a plurality of ventilation holes 52 are formed at equal intervals along the Z-axis direction.
  • the number of holes of the ventilation hole 52 is 10, for example. However, the number of holes is not limited to this and may be other than ten.
  • an outdoor heat exchanger 33, a blower 35, and the like are arranged in the blower chamber F.
  • the two blower fans 35a of the blower 35 are disposed along the Z-axis direction.
  • a fan motor 35b is attached to the back of each blower fan 35a.
  • the fan motor 35b is supported by a fan motor support plate 35c.
  • the fan motor support plate 35c is provided so as to extend from the bottom surface of the housing 40 in the vertical direction (+ Z direction).
  • the outdoor heat exchanger 33 is disposed so as to cover the blower 35.
  • the outdoor heat exchanger 33 is formed so that the XY cross section is L-shaped, and is disposed so as to cover the back surface (+ Y side surface) and side surface ( ⁇ X side surface) of the blower 35. .
  • the control unit includes, for example, an indoor unit control device of the indoor unit 20 and an outdoor unit control device of the outdoor unit 30, and controls the operation of the refrigeration cycle apparatus 10.
  • the control unit controls the rotation of the blower fans 22a and 35a by applying a voltage corresponding to the number of rotations of the blower fans 22a and 35a of the blowers 22 and 35.
  • the outdoor unit control device of the outdoor unit 30 includes an electronic component housed in the electronic component box 61 described above.
  • the refrigerant flow path of the indoor unit 20 and the refrigerant flow path of the outdoor unit 30 are connected by two connection pipes 11a and 11b as shown in FIG.
  • the connection pipes 11a and 11b are connected to the refrigerant flow paths of the indoor unit 20 and the outdoor unit 30 by, for example, flare nuts.
  • the refrigeration cycle circuit 100 is configured as a circuit sealed from the outside.
  • the refrigeration cycle apparatus 10 configured as described above performs air conditioning in a room to be air conditioned by performing a cooling operation, a dehumidifying operation, a heating operation, a blowing operation, and the like.
  • the blowing operation is an operation in which air is supplied only by the blower 22 without operating the refrigeration cycle of the refrigeration cycle apparatus 10.
  • the cooling operation, the dehumidifying operation, and the heating operation are operations for supplying cold air and hot air by the blower 22 while operating the refrigeration cycle.
  • the operation of the refrigeration cycle during the cooling operation and the dehumidifying operation is the same.
  • movement of a refrigerating cycle is demonstrated using FIG.
  • the solid arrows in FIG. 1 indicate the flow of the refrigerant during the cooling operation and the dehumidifying operation.
  • the dotted arrow in FIG. 1 shows the flow of the refrigerant during the heating operation.
  • the four-way valve 32 is switched to send the refrigerant from the compressor 31 to the outdoor heat exchanger 33. Then, the refrigerant flows as shown by the solid arrow in FIG.
  • the outdoor heat exchanger 33 functions as a condenser
  • the indoor heat exchanger 21 functions as an evaporator.
  • the refrigerant that has flowed in is compressed by the compressor 31. Then, the pressure and specific enthalpy of the refrigerant rise, change to a high-temperature and high-pressure gas refrigerant, and are sent out from the compressor 31.
  • the gas refrigerant sent out from the compressor 31 passes through the discharge pipe 31b and the four-way valve 32 and flows into the outdoor heat exchanger 33.
  • the refrigerant flows into the outdoor heat exchanger 33, the refrigerant is condensed by heat exchange with external air (outside air) supplied by the blower 35. Then, the specific enthalpy of the refrigerant decreases while the pressure is constant. As a result, the gas refrigerant changes to a low-temperature and high-pressure liquid refrigerant. This liquid refrigerant is sent out from the outdoor heat exchanger 33.
  • the liquid refrigerant flows into the expansion valve 34, the liquid refrigerant is expanded by the expansion valve 34. Then, the liquid refrigerant is depressurized with a constant specific enthalpy and changes to a low pressure state. At this time, the refrigerant is a gas-liquid two-phase refrigerant in which a gas refrigerant and a liquid refrigerant are mixed. The gas-liquid two-phase refrigerant is sent out from the expansion valve 34.
  • the gas-liquid two-phase refrigerant sent from the expansion valve 34 passes through the connection pipe 11b and flows into the refrigerant flow path of the indoor unit 20. Then, it flows into the indoor heat exchanger 21 of the indoor unit 20.
  • the refrigerant evaporates by heat exchange with the indoor air to be conditioned by the air supplied from the blower 22. Then, the specific enthalpy of the refrigerant increases while the pressure is constant. Thereby, a refrigerant
  • coolant changes to the gaseous refrigerant
  • the heated gas refrigerant sent from the indoor heat exchanger 21 passes through the connection pipe 11a and flows into the refrigerant flow path of the outdoor unit 30. Then, it flows into the compressor 31 again through the four-way valve 32 and the suction pipe 31a of the outdoor unit 30.
  • the refrigeration cycle in the dehumidifying operation is the same as the refrigeration cycle in the cooling operation described above.
  • the four-way valve 32 is switched to send the refrigerant from the compressor 31 to the indoor heat exchanger 21. Then, the refrigerant flows as shown by the dotted arrows in FIG.
  • the outdoor heat exchanger 33 functions as an evaporator
  • the indoor heat exchanger 21 functions as a condenser.
  • the gas refrigerant delivered from the compressor 31 passes through the discharge pipe 31b and the four-way valve 32 and flows out of the outdoor unit 30. Then, it passes through the connection pipe 11 a and flows into the indoor heat exchanger 21.
  • the refrigerant flows into the indoor heat exchanger 21
  • the refrigerant is condensed by heat exchange with the indoor air to be conditioned by the air supplied from the blower 22.
  • the specific enthalpy of the refrigerant decreases while the pressure is constant.
  • the gas refrigerant changes to a low-temperature and high-pressure supercooled liquid refrigerant.
  • indoor air is warmed by supplying the heat-exchanged air into the room. As a result, the room temperature of the air conditioning target increases.
  • the supercooled liquid refrigerant sent from the indoor heat exchanger 21 passes through the connection pipe 11b and flows into the refrigerant flow path of the outdoor unit 30. Then, it flows into the expansion valve 34 of the outdoor unit 30.
  • the liquid refrigerant flows into the expansion valve 34, the liquid refrigerant is expanded by the expansion valve 34. Then, the liquid refrigerant is depressurized with a constant specific enthalpy, and changes to a low temperature and low pressure state. At this time, the refrigerant is a gas-liquid two-phase refrigerant in which a gas refrigerant and a liquid refrigerant are mixed. The gas-liquid two-phase refrigerant is sent out from the expansion valve 34. Then, it flows into the expansion valve 34 of the outdoor unit 30.
  • the gas-liquid two-phase refrigerant flows into the outdoor heat exchanger 33, the gas-liquid two-phase refrigerant is condensed by heat exchange with the external air (outside air) supplied by the blower 35. As a result, the specific enthalpy of the refrigerant increases while the pressure remains constant. As a result, the gas-liquid two-phase refrigerant is changed to a gas refrigerant in a heated state of high temperature and low pressure. The gas refrigerant is sent out from the outdoor heat exchanger 33.
  • the heated gas refrigerant sent from the outdoor heat exchanger 33 flows again into the compressor 31 through the four-way valve 32 and the suction pipe 31a.
  • the above-described refrigeration cycle is repeated.
  • the control unit when an instruction to start cooling operation, heating operation, or the like from a user is transmitted to the control unit of the refrigeration cycle apparatus 10, the control unit operates before operating the refrigeration cycle.
  • the blower fan 35a of the blower 35 of the outdoor unit 30 is rotated for a predetermined time.
  • the time for rotating the blower fan 35a is stored in advance in the storage unit of the control unit. In the first embodiment, the set time for rotating the blower fan 35a is one minute.
  • blower fan 35a When the blower fan 35a rotates, since the blower fan 35a is a propeller fan, air is sucked from the back and sides of the blower fan 35a. Due to the suction force of the blower fan 35a, the outside air of the outdoor unit 30 is introduced into the machine room M from the introduction hole 45 of the housing 40, as indicated by an arrow W1 in FIG.
  • the combustible refrigerant may stay in the electronic component box 61.
  • the staying combustible refrigerant is discharged from the vent hole 63 together with the air flowing into the electronic component box 61.
  • the air flows into the blower chamber F through the ventilation holes 52 of the partition plate 50. That is, the air flow passing through the ventilation hole 52 functions as an air flow for discharging the combustible refrigerant.
  • the air flowing into the blower chamber F is blown out from the blower outlet 46 by the blower fan 35a as indicated by arrows W8 and W9. Since the discharged combustible refrigerant diffuses outdoors and the refrigerant concentration falls outside the combustible range, safety can be ensured.
  • a part of the air introduced into the machine room M also moves downward ( ⁇ Z direction) in the machine room M as indicated by an arrow W5.
  • the air moves so as to cut through the machine room M.
  • the arrow W6 it passes through the vicinity of the compressor 31 and the like.
  • the air that has passed through the vicinity of the compressor 31 and the like flows into the blower chamber F through the vent holes 51 of the partition plate 50 as indicated by an arrow W7.
  • the flammable refrigerant when the flammable refrigerant has leaked from the refrigeration cycle circuit 100 (for example, the compressor 31 or the connection pipes 11a and 11b connected to the compressor 31), the flammable refrigerant has a density higher than that of air. Therefore, it stays at the bottom of the machine room M. In this case, the staying combustible refrigerant merges with the air indicated by the arrows W5 and W6 moved downward in the machine room M. And the combustible refrigerant
  • the air flow that passes through the ventilation holes 51 functions as an air flow for discharging the combustible refrigerant. Then, the air flowing into the blower chamber F is blown out from the blower outlet 46 by the blower fan 35a as indicated by arrows W8 and W9. Since the discharged combustible refrigerant diffuses outdoors and the refrigerant concentration falls outside the combustible range, safety can be ensured.
  • coolant which stayed in the machine room M or the electronic component box 61 in this Embodiment 1 is discharged
  • the control unit of the refrigeration cycle apparatus 10 After rotating the blower fan 35a of the blower 35 for a predetermined time without operating the refrigeration cycle, the control unit of the refrigeration cycle apparatus 10 performs the designated operation mode (for example, heating operation, cooling operation, dehumidification).
  • the four-way valve 32 of the outdoor unit 30 is switched according to the operation or the like.
  • coolant of the compressor 31 is started by carrying out the swivel motion of the swirl
  • FIG. Thereby, the refrigerant in the refrigeration cycle circuit 100 is recirculated. As a result, the instructed operation mode is started.
  • the outside air of the outdoor unit 30 is continuously introduced into the machine room M from the introduction hole 45 of the housing 40 by the suction force of the blower fan 35a. .
  • a part of the air introduced into the machine room M moves upward in the machine room M and flows into the electronic part box 61, so that the electronic components and the mounting board accommodated in the electronic part box 61 are removed. Cooling. Further, the air introduced into the machine room M moves downward in the machine room M and passes through the vicinity of the compressor 31 and the like, thereby suppressing the temperature rise of the compressor 31 during operation. Thereby, the operation capability of the compressor 31 is enhanced.
  • the ventilation holes 51 are formed in the lower part of the partition plate 50. For this reason, the outside air introduced from the introduction hole 45 formed in the side panel 42 of the housing 40 passes through the ventilation hole 51 and is sent out of the housing 40 by the blower 35. Thereby, for example, even when the refrigerant leaks from the refrigeration cycle circuit 100 in the machine room M and stays at the bottom of the machine room M, the combustible refrigerant is discharged to the outside of the housing 40 together with the introduced outside air. Will come to be.
  • the ventilation hole 51 is not formed in the lower part of the partition plate 50 and the ventilation hole 52 is formed only in the upper part of the partition plate 50.
  • the refrigerant leaks from the refrigeration cycle circuit 100, the combustible refrigerant has a higher density than air, and therefore stays at the bottom of the machine room M. Since the refrigerant staying at the bottom must move upward (in the direction against gravity) so as to pass through the upper ventilation hole 52 by the suction force based on the rotation of the blower fan 35a of the blower 35, the staying refrigerant It is difficult to discharge all of these from the machine room M.
  • the electronic component box 61 when the electronic component box 61 is disposed in the upper portion of the machine room M, the electronic component accommodated in the electronic component box 61 is likely to become an ignition source when energized. For this reason, there is a possibility that the refrigerant that has moved upward passes through the vicinity of what is likely to be such an ignition source.
  • the ventilation hole 51 is formed in the lower part of the partition plate 50, so that the introduction is made from the introduction hole 45 formed in the side panel 42 of the housing 40.
  • the refrigerant that has accumulated at the bottom of the machine room M due to the outside air that has been discharged is easily discharged to the outside of the housing 40. Therefore, the safety of the refrigeration cycle apparatus 10 can be improved.
  • the ventilation holes 51 are formed in the lower part of the partition plate 50, even when the refrigeration cycle apparatus 10 is stopped, based on natural convection, The refrigerant can be discharged from the outlet 46 of the blower chamber F. Specifically, the combustible refrigerant staying at the bottom of the machine room M passes through the ventilation holes 51 formed in the lower part by natural convection as time passes. And it discharges
  • the introduction hole 45 for introducing outside air is formed at a position higher than the ventilation hole 51. For this reason, the outside air introduced from the introduction hole 45 flows from a high position to a low position according to gravity so as to traverse the inside of the machine room M. Thereby, the combustible refrigerant staying at the bottom of the machine room M can be discharged more smoothly to the outside of the housing 40.
  • the introduction hole 45 is formed at a position lower than the electronic component box 61. For this reason, rainwater that has entered through the introduction hole 45 is less likely to enter the electronic component box 61. As a result, it is possible to prevent a failure of the electronic component housed in the electronic component box 61.
  • the blower fan 35a of the blower 35 is rotated for a predetermined time before the operation of the refrigeration cycle is started. For this reason, even when the combustible refrigerant stays at the bottom of the machine room M (around the compressor 31), the combustible refrigerant is placed outside the housing 40 before the operation of the refrigeration cycle. It becomes possible to discharge. As a result, the combustible refrigerant can be removed from the periphery of the compressor 31 before the electric parts and electronic parts of the compressor 31 are energized, and the safety of the refrigeration cycle apparatus 10 can be improved.
  • a part of the air introduced into the machine room M moves upward (+ Z direction) in the machine room M and flows into the electronic component box 61. For this reason, the electronic component and the mounting substrate in the electronic component box 61 can be cooled.
  • a part of the air introduced into the machine room M moves downward ( ⁇ Z direction) in the machine room M and passes through the vicinity of the compressor 31 and the like. For this reason, when the refrigeration cycle is in operation, it is possible to suppress an increase in the temperature of the compressor 31 in operation. Thereby, the fall of the operation capability of the compressor 31 can be suppressed.
  • a part of the air introduced into the machine room M moves upward (+ Z direction) in the machine room M and passes through the electronic component box 61.
  • part of the introduced air moves downward ( ⁇ Z direction) in the machine room M and passes near the compressor 31 and the like.
  • the vent hole 51 formed in the lower portion of the partition plate 50 is covered with the bell mouth 48 so as not to be exposed from the air outlet 46 of the housing 40. Thereby, it is possible to prevent rainwater caused by wind and rain from entering the machine room M. As a result, the electronic components of the electronic component box 61 arranged in the machine room M and the compressor 31 can be protected, and these failures can be prevented.
  • the length L2 in the short direction of the vent hole 51 of the partition plate 50 is defined based on the extinction distance of the refrigerant. For this reason, even if the flammable refrigerant staying in the machine room M is ignited, the flame of the refrigerant cannot pass through the ventilation holes 51. Thus, the refrigerant flame does not leak outside the housing 40. In addition, when all of the combustible refrigerant that is the source of ignition burns out, it is extinguished naturally. Therefore, the safety of the user of the refrigeration cycle apparatus 10 can be ensured, and the safety of the refrigeration cycle apparatus 10 can be improved.
  • the length L1 in the short direction of the introduction hole 45 of the side panel 42 of the housing 40 is also defined based on the extinction distance of the refrigerant. For this reason, even if the flammable refrigerant staying in the machine room M is ignited, the flame of the refrigerant cannot pass through the introduction hole 45. No flame leaks. Therefore, the safety of the user of the refrigeration cycle apparatus 10 can be ensured, and the safety of the refrigeration cycle apparatus 10 can be improved.
  • the ventilation hole 51 leading from the machine room M to the blower room F is formed in the lower part of the partition plate 50 as shown in FIG. Specifically, it is formed near the lower end of the partition plate 50.
  • the lower part of the partition plate 50 indicates a lower side than the intermediate position of the partition plate 50 in the Z-axis direction. Therefore, the ventilation hole 51 may be formed at a position other than the position shown in FIG. 7 as long as it is below the intermediate position of the partition plate 50.
  • the position where the vent hole 51 is formed is preferably as low as possible from the viewpoint of easy discharge of the flammable refrigerant having a high density.
  • the cross-sectional shape of the ventilation hole 51 is not limited to the rectangular shape shown in the first embodiment, the cross-sectional shape of the introduction hole 45 formed in the side panel 42 of the housing 40 is described in detail. The same applies to.
  • the introduction hole 45 is formed so that the YZ section is rectangular as shown in FIG.
  • the present invention is not limited to this, and the introduction hole 45 may be formed to have a cross section other than a rectangular shape as long as the shortest dimension of the ventilation hole 51 is defined based on the extinction distance.
  • the introduction hole 45 may be formed so that the YZ section has a round hole shape. In this case, the diameter of the round hole shape is 6 mm or less based on the flame extinguishing distance of R32 used in the present embodiment.
  • the introduction hole 45 may be formed so that the YZ cross section has an elliptical shape.
  • the dimension of the short side of the elliptical shape is 6 mm or less based on the extinction distance of R32 used in the present embodiment.
  • the cross section of the vent hole 51 may be an oval shape or a shape other than the above-described shapes (rectangular shape, circular shape, elliptical shape, oval shape).
  • Embodiments 1 to 6 the example in which the refrigeration cycle apparatus 10 is used for an air conditioner has been described, but the present invention can also be applied to other devices such as a heat source device of a water heater.

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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)
  • Cold Air Circulating Systems And Constructional Details In Refrigerators (AREA)
  • Air Conditioning Control Device (AREA)
PCT/JP2013/071014 2012-09-12 2013-08-02 冷凍サイクル装置 WO2014041920A1 (ja)

Priority Applications (5)

Application Number Priority Date Filing Date Title
MX2015003248A MX360031B (es) 2012-09-12 2013-08-02 Dispositivo de ciclo de refrigeracion.
US14/416,712 US20150204599A1 (en) 2012-09-12 2013-08-02 Refrigeration cycle device
EP13836578.8A EP2896897B1 (en) 2012-09-12 2013-08-02 Refrigeration cycle device
AU2013317055A AU2013317055B2 (en) 2012-09-12 2013-08-02 Refrigeration cycle device
ES13836578T ES2935032T3 (es) 2012-09-12 2013-08-02 Dispositivo de ciclo de refrigeración

Applications Claiming Priority (2)

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JP2012-200380 2012-09-12
JP2012200380A JP5805598B2 (ja) 2012-09-12 2012-09-12 冷凍サイクル装置

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EP (1) EP2896897B1 (zh)
JP (1) JP5805598B2 (zh)
CN (3) CN105674430B (zh)
AU (1) AU2013317055B2 (zh)
ES (1) ES2935032T3 (zh)
MX (1) MX360031B (zh)
WO (1) WO2014041920A1 (zh)

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US20150204599A1 (en) 2015-07-23
CN105674430A (zh) 2016-06-15
EP2896897A1 (en) 2015-07-22
MX360031B (es) 2018-10-19
AU2013317055B2 (en) 2016-03-03
MX2015003248A (es) 2015-06-10
CN103673095B (zh) 2017-01-11
ES2935032T3 (es) 2023-03-01
JP5805598B2 (ja) 2015-11-04
EP2896897A4 (en) 2016-08-03
AU2013317055A1 (en) 2015-02-19
EP2896897B1 (en) 2022-12-14
CN103673095A (zh) 2014-03-26
JP2014055705A (ja) 2014-03-27
CN105674430B (zh) 2019-05-03

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