WO2021095133A1 - 室内機およびそれを備えた空気調和装置 - Google Patents

室内機およびそれを備えた空気調和装置 Download PDF

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Publication number
WO2021095133A1
WO2021095133A1 PCT/JP2019/044400 JP2019044400W WO2021095133A1 WO 2021095133 A1 WO2021095133 A1 WO 2021095133A1 JP 2019044400 W JP2019044400 W JP 2019044400W WO 2021095133 A1 WO2021095133 A1 WO 2021095133A1
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WO
WIPO (PCT)
Prior art keywords
bell mouth
indoor unit
fan
drain pan
opening
Prior art date
Application number
PCT/JP2019/044400
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
惇司 河野
拓矢 寺本
栗原　誠
一樹 磯村
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 EP19952643.5A priority Critical patent/EP4060246B1/en
Priority to PCT/JP2019/044400 priority patent/WO2021095133A1/ja
Priority to JP2021555668A priority patent/JP7386885B2/ja
Publication of WO2021095133A1 publication Critical patent/WO2021095133A1/ja

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Classifications

    • 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
    • F24F1/0007—Indoor units, e.g. fan coil units
    • F24F1/0018—Indoor units, e.g. fan coil units characterised by fans
    • F24F1/0022—Centrifugal or radial fans
    • 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
    • F24F1/0007—Indoor units, e.g. fan coil units
    • F24F1/0043—Indoor units, e.g. fan coil units characterised by mounting arrangements
    • F24F1/0047—Indoor units, e.g. fan coil units characterised by mounting arrangements mounted in the ceiling or at the ceiling
    • 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
    • F24F1/0007—Indoor units, e.g. fan coil units
    • F24F1/0059—Indoor units, e.g. fan coil units characterised by heat exchangers
    • F24F1/0063—Indoor units, e.g. fan coil units characterised by heat exchangers by the mounting or arrangement of the heat exchangers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
    • F24F13/22—Means for preventing condensation or evacuating condensate
    • 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
    • F24F1/02—Self-contained room units for air-conditioning, i.e. with all apparatus for treatment installed in a common casing
    • F24F1/028—Self-contained room units for air-conditioning, i.e. with all apparatus for treatment installed in a common casing characterised by air supply means, e.g. fan casings, internal dampers or ducts
    • 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

Definitions

  • the present invention relates to an indoor unit and an air conditioner including the indoor unit.
  • the air conditioner includes a ceiling-embedded indoor unit that is embedded in the ceiling as an indoor unit that is placed indoors.
  • Patent Document 1 is an example of a patent document that discloses an air conditioner including this type of indoor unit.
  • a bell mouth, a fan, a fan motor, a heat exchanger, a drain pan, etc. are housed in the housing.
  • Panels are arranged so as to cover the bell mouth, the fan, etc. housed in the housing.
  • the panel is formed with a suction grill that takes in the air in the room and an outlet that sends out the air into the room.
  • a filter is attached to the suction grill. The filter is arranged so as to face the bell mouth.
  • the air taken in from the suction grill is guided to the fan by the bell mouth with an opening.
  • the air guided by the fan is sent out toward the periphery of the fan and flows through the heat exchanger.
  • heat is exchanged between the refrigerant flowing through the heat exchanger and the air.
  • the heat-exchanged air will be sent out into the room through the air outlet of the panel. In this way, the room is cooled or heated.
  • the indoor unit is required to further reduce the ventilation resistance.
  • the present invention has been made as a part of such development, one purpose is to provide an indoor unit capable of further reducing ventilation resistance, and another purpose is to provide such an indoor unit. It is to provide a equipped air conditioner.
  • the indoor unit has a fan, a bell mouth, a drain pan, a heat exchanger, a panel, and a filter.
  • the fan has a rotating shaft, sucks in air, and sends the sucked air toward the surroundings.
  • the bell mouth has an opening that opens toward the fan and guides air to the fan.
  • the drain pan is arranged so as to surround the bell mouth.
  • the heat exchanger is mounted on the drain pan so as to surround the fan.
  • the panel is located on the opposite side of the bell mouth and drain pan from where the fan is located and has an air intake grill.
  • the filter is mounted on the suction grill at a distance from the bell mouth.
  • the bell mouth has a first part, a second part and a third part.
  • the first part is formed so that the opening narrows toward the fan.
  • the second part is arranged around the first part in a manner connected to the first part.
  • the third part is arranged around the second part in a manner of connecting to the second part and connecting to the drain pan.
  • a first flat portion is formed in the second portion.
  • a second flat portion is formed in the third portion. If the axial distance between the first flat portion and the second flat portion on the rotation axis is L1, and the axial distance between the first flat portion and the open end in the first portion is L2, then L1 ⁇ L2. ..
  • the first flat portion in the second portion is located between the drain pan and the fan in the axial position.
  • the air conditioner according to the present invention is an air conditioner provided with the above indoor unit.
  • the bell mouth includes a second part having a first part and a first flat part, and a third part having a second flat part.
  • the axial distance between the first flat portion and the second flat portion on the rotation axis is L1 and the axial distance between the first flat portion and the end portion on the fan side in the first portion is L2, L1 ⁇ It is L2.
  • the first flat portion in the second portion is located between the drain pan and the fan in the axial position. As a result, the distance between the bell mouth and the filter is secured, and the ventilation resistance can be further reduced.
  • the ventilation resistance can be reduced by providing the indoor unit.
  • FIG. 5 is a partially enlarged cross-sectional view for explaining the structure of a bell mouth and a drain pan in the same embodiment.
  • the air conditioner 1 includes a compressor 3, an indoor unit 5, an expansion valve 7, an outdoor heat exchanger 9, an outdoor fan 13, and a four-way valve 15.
  • the compressor 3, the indoor unit 5, the expansion valve 7, the outdoor heat exchanger 9, and the four-way valve 15 are connected by a refrigerant pipe 17.
  • a heat exchanger 41, a fan 35, and the like are arranged in the indoor unit 5.
  • the structure of the indoor unit 5 will be described in detail later.
  • a high-temperature and high-pressure gas refrigerant is discharged from the compressor 3.
  • the discharged high-temperature and high-pressure gas refrigerant flows into the heat exchanger 41 of the indoor unit 5 via the four-way valve 15.
  • heat exchanger 41 heat exchange is performed between the gas refrigerant that has flowed in and the air that is sent by the fan 35.
  • the high-temperature and high-pressure gas refrigerant condenses into a high-pressure liquid refrigerant (single-phase).
  • the heat-exchanged air is sent out from the indoor unit 5 into the room to heat the room.
  • the high-pressure liquid refrigerant sent out from the heat exchanger 41 becomes a two-phase state refrigerant of the low-pressure gas refrigerant and the liquid refrigerant by the expansion valve 7.
  • the two-phase refrigerant flows into the outdoor heat exchanger 9.
  • the outdoor heat exchanger 9 functions as an evaporator. In the outdoor heat exchanger 9, heat exchange is performed between the flowing two-phase refrigerant and the air supplied by the outdoor fan 13. Of the two-phase refrigerants, the liquid refrigerant evaporates to become a low-pressure gas refrigerant (single-phase).
  • the low-pressure gas refrigerant sent out from the outdoor heat exchanger 9 flows into the compressor 3 via the four-way valve 15.
  • the low-pressure gas refrigerant that has flowed into the compressor 3 is compressed to become a high-temperature and high-pressure gas refrigerant, and is discharged from the compressor 3 again. Hereinafter, this cycle is repeated.
  • a high-temperature and high-pressure gas refrigerant is discharged from the compressor 3.
  • the discharged high-temperature and high-pressure gas refrigerant flows into the outdoor heat exchanger 9 via the four-way valve 15.
  • the outdoor heat exchanger 9 functions as a condenser. In the outdoor heat exchanger 9, heat exchange is performed between the flowing refrigerant and the air supplied by the outdoor fan 13.
  • the high-temperature and high-pressure gas refrigerant condenses into a high-pressure liquid refrigerant (single-phase).
  • the high-pressure liquid refrigerant sent out from the outdoor heat exchanger 9 becomes a two-phase refrigerant of a low-pressure gas refrigerant and a liquid refrigerant by the expansion valve 7.
  • the two-phase refrigerant flows into the heat exchanger 41 of the indoor unit 5.
  • heat exchanger 41 heat exchange is performed between the flowing two-phase refrigerant and the air sent to the indoor unit 5 by the fan 35.
  • the liquid refrigerant evaporates to become a low-pressure gas refrigerant (single-phase).
  • the heat-exchanged air is sent out from the indoor unit 5 into the room to cool the room.
  • the low-pressure gas refrigerant sent out from the heat exchanger 41 flows into the compressor 3 via the four-way valve 15.
  • the low-pressure gas refrigerant that has flowed into the compressor 3 is compressed to become a high-temperature and high-pressure gas refrigerant, and is discharged from the compressor 3 again.
  • this cycle is repeated.
  • the indoor unit 5 according to each embodiment will be specifically described.
  • Embodiment 1 The indoor unit according to the first embodiment will be described. As shown in FIG. 2, in the indoor unit 5, the fan 35, the fan motor 39, the bell mouth 23, the drain pan 43, and the heat exchanger 41 are housed in the casing 21.
  • the casing 21 has a panel 53 in which an air suction grill 55 and an air outlet 59 are formed.
  • the fan 35 has a rotating shaft CA, and the rotating shaft CA is connected to the fan motor 39.
  • the fan 35 sucks the air in the room from the grill 55 into the casing 21, and sends the sucked air into the room from the outlet 59 through the heat exchanger 41.
  • the bell mouth 23 guides air to the fan 35.
  • the bell mouth 23 has an opening 24 that opens toward the fan 35. As shown in FIG. 3, the shape of the opening 24 is, for example, a circular shape.
  • the drain pan 43 is arranged so as to surround the bell mouth 23.
  • FIG. 5 shows a state seen from the inside of the casing.
  • the drain pan 43 is fixed to the casing 21.
  • the panel 53 is formed with a suction grill 55 and an outlet 59.
  • the shape of the suction grill 55 is, for example, a rectangular shape.
  • the panel 53 is detachably attached to the casing 21.
  • the panel 53 is arranged on the side opposite to the side where the fan 35 is arranged with respect to the bell mouth 23.
  • a filter 57 is attached to the suction grill 55 at a distance from the bell mouth 23.
  • An electric component box 51 is arranged between the panel 53 and the bell mouth 23.
  • the electrical component box 51 is located in the area surrounded by the drain pan 43.
  • the electrical component box 51 contains a control board or the like (not shown) that controls the operation of the indoor unit 5. Note that FIG. 6 shows a state viewed from the outside (indoor side) of the casing.
  • the bell mouth 23 includes a first part 25, a second part 27, and a third part 29.
  • the first part 25 is formed in such a manner that the opening 24 is narrowed toward the fan 35.
  • the opening 24 is formed so that the opening diameter becomes shorter as it approaches the fan 35.
  • the second part 27 is arranged around the first part 25 in a manner connected to the first part 25.
  • the second portion 27 is provided with a flat portion 27a as a first flat portion.
  • the flat portion 27a is located in a direction intersecting the rotation axis CA.
  • the third part 29 is arranged around the second part 27 in a manner of connecting to the second part 27 and connecting to the drain pan 43.
  • the third portion 29 is provided with a flat portion 29a as a second flat portion.
  • the flat portion 29a is located in a direction intersecting the rotation axis CA.
  • L1 be the axial distance of the rotation axis CA between the flat portion 27a of the second part 27 and the flat portion 29a of the third part 29.
  • L2 be the axial distance of the rotation axis CA between the flat portion 27a of the second portion 27 and the open end of the first portion 25.
  • the distance L2 is set longer than the distance L1 (L1 ⁇ L2).
  • the inner peripheral portion 45 located on the inner peripheral side of the drain pan 43 has a first extending portion 47 extending in the axial direction of the rotating shaft CA and a second extending portion extending in a direction intersecting the axial direction of the rotating shaft CA. It has an extending portion 49.
  • the third part 29 of the bell mouth 23 is connected to the second extending part 49.
  • the flat portion 27a of the second portion 27 of the bell mouth 23 is located between the second extending portion 49 of the drain pan 43 and the fan 35 at a position in the axial direction of the rotation axis CA.
  • the flat portion 27a is located above the second extending portion 49.
  • the ventilation resistance and the like can be suppressed by arranging the bell mouth 23 provided with the first part 25, the second part 27 and the third part 29 having a desired length relationship. .. This will be described in comparison with the indoor unit according to the comparative example.
  • the same members as the indoor unit 5 according to the first embodiment are designated by the same reference numerals, and the description thereof will not be repeated unless necessary.
  • a bell mouth 123 that guides the air sucked from the suction grill 55 to the fan 35 is arranged.
  • the bell mouth 123 has a portion 123b extending from the lower end of the second extending portion 49 on the inner peripheral portion 45 of the drain pan 43 toward the rotation axis CA, and extending from the portion 123b toward the fan 35 while being curved. It is provided with an existing portion 123a.
  • the portion 123b connecting the portion 123a of the bell mouth 123 and the drain pan 43 extends from the lower end portion of the second extending portion 49 of the drain pan 43 toward the rotation axis CA. There is.
  • the portion 123b of the bell mouth 123 approaches the filter 57.
  • the axial distance LB of the rotation axis CA between the portion 123b and the filter 57 is shorter than the distance LA (see FIG. 7) in the indoor unit 5 according to the first embodiment.
  • the air that has passed through the filter 57 will flow into the opening 24 of the bell mouth.
  • the bell mouth 123 (part 123b) is close to the filter 57, the ventilation resistance of air increases.
  • the higher the ventilation resistance of air the higher the noise.
  • the power consumption of the fan motor 39 that drives the fan 35 will increase.
  • a part of the air sent out from the fan 35 may flow from the heat exchanger 41 toward the bell mouth 123 (part 123a) without passing through the heat exchanger 41.
  • the air flowing toward the bell mouth 123 flows through the gap between the bell mouth 123 and the fan 35, and is sent to the fan 35 together with the air flowing through the opening 24 of the bell mouth 123.
  • the flow of air sent back to the fan 35 without passing through the heat exchanger 41 is called a circulation flow.
  • the circulation flow becomes a factor that deteriorates the efficiency of the fan 35.
  • the bell mouth 23 has a first part 25, a second part 27 having a flat part 27a, and a second part 27 having a flat part 29a. It has 3 parts 29.
  • the flat portion 27a of the second portion 27 is located above the second extending portion 49 of the drain pan 43.
  • the distance LA in the axial direction of the rotation axis CA between the flat portion 27a of the second portion 27 of the bell mouth 23 and the filter 57 is secured.
  • the wind speed distribution of the air flowing into the opening 24 of the bell mouth 23 becomes more uniform as compared with the indoor unit 5 according to the comparative example, and the ventilation resistance of the air can be reduced.
  • the portion of the bell mouth 23 located in the axial direction of the rotation axis CA located between the second part 27 and the third part 29 serves as a resistor and becomes a heat exchanger.
  • the flow of air passing through 41 is promoted.
  • the circulation flow of air sent to the fan 35 again from the gap between the bell mouth 23 and the fan 35 can be reduced.
  • the noise of the indoor unit 5 can be suppressed and the power consumption of the fan motor 39 can be suppressed.
  • the axial distance L2 of the rotation axis CA between the second portion 27 (flat portion 27a) and the end portion on the fan 35 side in the first portion 25 is the second portion 27 (flat portion 27a) and the third portion 29.
  • the distance between the rotation axis CA and the (flat portion 29a) in the axial direction is set to be longer than L1 (L1 ⁇ L2).
  • the separation of air in the first part 25 of the bell mouth 23 can be suppressed, the flow of air sent to the fan 35 can be suppressed to be disturbed, and the air flowing into the opening 24 of the bell mouth 23 can be suppressed.
  • the wind speed distribution is made uniform, and the ventilation resistance of air can be reduced. As a result, it is possible to contribute to the reduction of noise and the reduction of the power consumption of the fan motor 39.
  • the second part 27 and the third part of the bell mouth 23 may be smoothly connected in a curved shape.
  • the rotation axis CA is located at the portion 27 of the second portion 27 located at the circumferential position as the first circumferential position corresponding to the corner portion of the suction grill 55.
  • the first inclined portion 27b inclined with respect to the relative may be provided.
  • the first inclination angle ⁇ 1 of the first inclined portion 27b for example, 45 ° to 90 ° is desirable.
  • the first inclination angle ⁇ 1 is an angle formed with a direction intersecting the axial direction of the rotation axis CA.
  • the second inclined portion 27c is provided in the portion of the second portion 27 located at the circumferential position as the second circumferential position other than the circumferential position of the bell mouth 23 corresponding to the corner portion of the suction grill 55. May be good.
  • the second tilt angle ⁇ 2 of the second tilt portion 27c it is desirable to set the second tilt angle ⁇ 2 so that the first tilt angle ⁇ 1 is smaller than the second tilt angle ⁇ 2.
  • the flow velocity of the air flowing from the corner of the suction grill 55 toward the opening 24 of the bell mouth 23 is faster than the flow velocity of the air flowing from other than the corner toward the opening 24 of the bell mouth 23. Therefore, by setting the first inclination angle ⁇ 1 to be smaller than the second inclination angle ⁇ 2, it is possible to suppress the separation of air.
  • Embodiment 2 The indoor unit according to the second embodiment will be described.
  • the thickness of the second extending portion in the inner peripheral portion of the drain pan differs between the portion where the electric component box is arranged and the portion where the electric component box is not arranged.
  • an electric component box 51 is arranged between the panel 53 and the bell mouth 23. As shown in FIG. 12, the electrical component box 51 is arranged along one side of the rectangular suction grill 55. Of the second extending portion 49 in the inner peripheral portion 45 of the drain pan 43, the electric component box 51 is arranged in the thickness T1 of the second extending portion second portion 49b in which the electric component box 51 is arranged. There is no second extending portion. The thickness of the second portion 49a is thinner than T2.
  • the height position of the upper end of the inner peripheral portion 45 of the drain pan 43 (the axial position of the rotation axis CA) is set to the same height position over the entire circumference of the drain pan 43. Since the other configurations are the same as the configurations of the indoor unit 5 shown in FIG. 2, the same members are designated by the same reference numerals, and the description thereof will not be repeated unless necessary.
  • the electric component box 51 is placed on the fan 35 side by making the thickness T1 of the second extending portion 2nd portion 49b thinner than the thickness T2 of the second extending portion 2nd portion 49a. It is possible to secure a gap between the electric component box 51 and the filter 57 by that amount.
  • the height position of the upper end of the inner peripheral portion 45 of the drain pan 43 is set to the same height position over the entire circumference of the drain pan 43, it is sent out from the fan 35 toward the heat exchanger 41. It is possible to suppress the occurrence of turbulence in the flow of air circulating in the circumferential direction.
  • Embodiment 3 The indoor unit according to the third embodiment will be described. As shown in FIG. 13, in the indoor unit 5, the electric component box 51 is arranged between the panel 53 and the bell mouth 23. The electrical component box 51 is arranged at a distance L3 from the flat portion 27a in the second portion 27 of the bell mouth 23.
  • the electrical component box 51 is in contact with the flat portion 29a in the third portion 29 of the bell mouth 23.
  • the electrical component box 51 is fixed so as to sandwich the flat portion 29a between the electrical component box 51 and the second extending portion 49 of the drain pan 43. Since the other configurations are the same as the configurations of the indoor unit 5 shown in FIG. 2, the same members are designated by the same reference numerals, and the description thereof will not be repeated unless necessary.
  • the electrical component box 51 When the electrical component box 51 is arranged so as to cover a part of the opening 24 in a plan view with respect to the opening 24 of the bell mouth 23, for example, the indoor unit 5 according to the comparative example shown in FIG. Then, in the region on the bell mouth 23 side (downstream side of the flow) in the electrical component box 51, a region (dead water region) in which the air flow is stagnant may occur.
  • the electrical component box 51 is arranged at a distance L3 from the flat portion 27a in the second portion 27 of the bell mouth 23, and a gap is secured between the electrical component box 51 and the flat portion 27a in the second portion 27. Will be done.
  • Embodiment 4 The indoor unit according to the fourth embodiment will be described.
  • the rib 31 is arranged on the surface of the bell mouth 23 on the suction grill 55 side.
  • the rib 31 faces the rotation axis CA at the portion of the circumferential position of the bell mouth 23, which is the circumferential position as the third circumferential position corresponding to the corner portion (see the dotted line frame DC) of the rectangular suction grill 55. Is formed in the radial direction. Since the other configurations are the same as the configurations of the indoor unit 5 shown in FIG. 2, the same members are designated by the same reference numerals, and the description thereof will not be repeated unless necessary.
  • the flow rate of air flowing from the corner of the suction grill 55 toward the opening 24 of the bell mouth 23 is larger than the flow rate of air flowing from other than the corner toward the opening 24 of the bell mouth 23. Therefore, the flow velocity of the air flowing from the corner of the suction grill 55 toward the opening 24 of the bell mouth 23 tends to be faster than the flow velocity of the air flowing from other than the corner toward the opening 24 of the bell mouth 23. Then, it is assumed that the wind speed distribution in the circumferential direction of the air flowing from the suction grill 55 toward the opening 24 of the bell mouth 23 can be biased.
  • ribs 31 are formed in the circumferential position of the bell mouth 23 at the circumferential position corresponding to the corner portion (see the dotted line frame DC) of the rectangular suction grill 55.
  • the rib 31 is formed in the radial direction toward the rotation axis CA.
  • the rib 31 acts as a ventilation resistance, and the flow velocity of the air flowing from the corner of the suction grill 55 toward the opening 24 of the bell mouth 23 is reduced. As a result, the wind speed distribution in the circumferential direction of the air flowing from the suction grill 55 toward the opening 24 of the bell mouth 23 can be made uniform.
  • Embodiment 5 The indoor unit according to the fifth embodiment will be described. As shown in FIG. 17, in the indoor unit 5, the bell mouth 23 is provided with a first curvature portion 33a having a relatively small curvature and a second curvature portion 33b having a relatively large curvature.
  • the first curvature portion 33a is arranged in the circumferential position of the bell mouth 23 as the fourth circumferential position corresponding to the corner portion of the rectangular suction grill 55. ing.
  • the second curvature portion 33b is arranged at a portion of the circumferential position of the bell mouth 23 at a circumferential position as a fifth circumferential position corresponding to a portion other than the corner portion of the rectangular suction grill 55.
  • the distance LC between the portion where the first curvature portion 33a is arranged and the filter 57 in the bell mouth 23 is shorter than the distance LD between the portion where the second curvature portion 33b is arranged and the filter 57.
  • both the first curvature portion 33a and the second curvature portion 33b are used in order to simplify the drawing and make it easier to understand the difference in curvature between the first curvature portion 33a and the second curvature portion 33b.
  • a cross section is shown. Since the other configurations are the same as the configurations of the indoor unit 5 shown in FIG. 2, the same members are designated by the same reference numerals, and the description thereof will not be repeated unless necessary.
  • the flow velocity of the air flowing from the corner of the suction grill 55 toward the opening 24 of the bell mouth 23 is the flow velocity of the air flowing from other than the corner toward the opening 24 of the bell mouth 23. It tends to be faster than the flow velocity. Then, it is assumed that the wind speed distribution in the circumferential direction of the air flowing from the suction grill 55 toward the opening 24 of the bell mouth 23 can be biased.
  • a first curvature portion 33a having a small curvature is arranged at a portion of the bell mouth 23 located in the circumferential direction corresponding to a corner portion of the rectangular suction grill 55.
  • a second curvature portion 33b having a large curvature is arranged at a portion of the bell mouth 23 located in the circumferential direction corresponding to a portion other than the corner portion of the suction grill 55.
  • the distance LC in the axial direction of the rotation axis CA between the portion of the bell mouth 23 where the first curvature portion 33a is arranged and the filter 57 is the rotation between the portion where the second curvature portion 33b is arranged and the filter 57. It is shorter than the axial distance LD of the axis CA.
  • the present invention is effectively used in an air conditioner equipped with an indoor unit.
  • Air conditioner 3 Compressor, 5 Indoor unit, 7 Expansion valve, 9 Outdoor heat exchanger, 13 Outdoor fan, 15 Four-way valve, 17 Refrigerant piping, 21 Casing, 23 Bellmouth, 24 Opening, 25 Part 1 , 27 2nd part, 27a flat part, 27b 1st inclined part, 27c 2nd inclined part, 29 3rd part, 29a flat part, 31 rib, 33a 1st curvature part, 33b 2nd curvature part, 35 fan, 37 Rotating shaft, 39 fan motor, 41 heat exchanger, 43 drain pan, 45 inner circumference, 47 1st extension, 49 2nd extension, 49a 2nd extension 1st, 49b 2nd extension Part 2, 51 Electrical parts box, 53 panel, 55 suction grill, 57 filter, 59 outlet, CA central axis, L1, L2, L3, LA, LB, LC, LD distance, T1, T2 thickness, DC Dotted frame.

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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)
  • Air Filters, Heat-Exchange Apparatuses, And Housings Of Air-Conditioning Units (AREA)
  • Devices For Blowing Cold Air, Devices For Blowing Warm Air, And Means For Preventing Water Condensation In Air Conditioning Units (AREA)
  • Air-Conditioning Room Units, And Self-Contained Units In General (AREA)
PCT/JP2019/044400 2019-11-12 2019-11-12 室内機およびそれを備えた空気調和装置 WO2021095133A1 (ja)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP19952643.5A EP4060246B1 (en) 2019-11-12 2019-11-12 Indoor unit and air conditioning device provided with same
PCT/JP2019/044400 WO2021095133A1 (ja) 2019-11-12 2019-11-12 室内機およびそれを備えた空気調和装置
JP2021555668A JP7386885B2 (ja) 2019-11-12 2019-11-12 室内機およびそれを備えた空気調和装置

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2019/044400 WO2021095133A1 (ja) 2019-11-12 2019-11-12 室内機およびそれを備えた空気調和装置

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