EP3598020A1 - Unité intérieure pour climatiseur - Google Patents

Unité intérieure pour climatiseur Download PDF

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Publication number
EP3598020A1
EP3598020A1 EP17901212.5A EP17901212A EP3598020A1 EP 3598020 A1 EP3598020 A1 EP 3598020A1 EP 17901212 A EP17901212 A EP 17901212A EP 3598020 A1 EP3598020 A1 EP 3598020A1
Authority
EP
European Patent Office
Prior art keywords
drain pan
bell mouth
bell
main body
mouth
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP17901212.5A
Other languages
German (de)
English (en)
Other versions
EP3598020B1 (fr
EP3598020A4 (fr
Inventor
Nobusato Yoshitake
Kenji Gajina
Takashi Hiraoka
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Toshiba Carrier Corp
Original Assignee
Toshiba Carrier Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Toshiba Carrier Corp filed Critical Toshiba Carrier Corp
Publication of EP3598020A1 publication Critical patent/EP3598020A1/fr
Publication of EP3598020A4 publication Critical patent/EP3598020A4/fr
Application granted granted Critical
Publication of EP3598020B1 publication Critical patent/EP3598020B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • F24F1/0043—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
    • F24F1/0018—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
    • F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
    • F24F13/20—Casings or covers

Definitions

  • Embodiments described herein relate generally to an indoor unit for an air conditioner.
  • an indoor unit is suspended in the ceiling space.
  • the indoor unit has a box-shaped casing containing therein an air blower and heat exchanger, and a lower end of the casing is closed with a drain pan configured to receive dew condensation water dropping from the heat exchanger.
  • the drain pan includes a bell-mouth mounting hole positioned directly beneath the air blower, and a bell mouth is attached to the bell-mouth mounting hole.
  • the bell mouth is an element configured to straighten a flow of air sucked by the air blower, and an outer circumferential part thereof is detachably fixed to the drain pan.
  • Patent Literature 1 JP 4122396 B
  • an indoor unit for a conventional air conditioner at least four positions of an outer circumferential part of the bell mouth are fixed to the drain pan by using screws. Accordingly, it is inevitable that the number of screws is naturally increases, this being a factor causing an increase in cost.
  • An embodiment described herein aims to obtain an indoor unit for an air conditioner capable of reducing the number of components used to fix a bell mouth to a drain pan and improving the workability at the time when the bell mouth is detached from or is attached to the drain pan.
  • an indoor unit for air conditioner includes a unit main body accommodating therein an air blower and heat exchanger, drain pan to be attached to a lower end of the unit main body and configured to receive dew condensation water created in the heat exchanger and including an inner circumferential wall defining a bell-mouth mounting hole continuous with the suction side of the air blower, and bell mouth detachably fitted into the bell-mouth mounting hole of the drain pan.
  • a plurality of pieces of coupling fittings are provided in the inner circumferential wall of the drain pan.
  • the coupling fittings are provided in the circumferential direction of the inner circumferential wall with intervals held between the coupling fittings, and each of the coupling fittings includes a head at a lower end of a shank downwardly protruded from a lower end of the inner circumferential wall, the head having a diameter greater than the shank.
  • a plurality of fixing parts are provided in an outer circumferential part of the bell mouth with intervals held between the fixing parts in the circumferential direction. Each of the fixing parts includes a through-hole to be penetrated by the head of the coupling fittings and engaging hole continuous with the through-hole and on which the head gets caught.
  • FIG. 1 is a perspective view of an indoor unit for a ceiling-embedded air conditioner
  • FIG. 2 is a perspective view showing the state where a unit main body and ceiling panel are separated from each other.
  • an indoor unit 1 for an air conditioner is provided with a unit main body 2 to be installed in the ceiling space and ceiling panel 3 attached to a lower end of the unit main body 2 as main elements.
  • the unit main body 2 is provided with a casing 4 made of sheet metal.
  • the casing 4 is a downwardly opened box-shaped element, and is suspended from a beam in the ceiling space through, for example, four hanging bolts (not shown).
  • the casing 4 includes a top plate part 4a and side part 4b.
  • the side part 4b is continuous in the circumferential direction of the casing 4 and includes four outer circumferential corner parts 4c.
  • inner surfaces of the top plate part 4a and side part 4b are covered with a heat insulating material 5 made of, for example, foamed polystyrene.
  • the heat insulating material 5 defines an opening part 6 at a lower end of the casing 4.
  • a hanging hook 7 is fixed to each outer circumferential corner part 4c of the casing 4.
  • the hanging hooks 7 are horizontally protruded in four directions from the casing 4, and a lower end of the hanging bolt is coupled to each hanging hook 7.
  • brackets 8 are fixed to the casing 4.
  • the bracket 8 is positioned at a lower end part of each outer circumferential corner part 4c of the casing 4 in such a manner as to be positioned directly under the hanging hook 7.
  • the brackets 8 are horizontally protruded in the four directions from the casing 4.
  • an air blower 10 and heat exchanger 11 are accommodated in the casing 4.
  • the air blower 10 a so-called centrifugal fan configured to suck air from the axial direction and discharge the air in the circumferential direction is employed.
  • the upper end of the air blower 10 is covered with the top plate part 4a of the casing 4, and hence the lower end of the air blower 10 serves as the suction side.
  • the heat exchanger 11 is raised inside the casing 4 in such a manner as to surround the discharge side of the air blower 10.
  • the heat exchanger 11 is provided with a plurality of heat radiating fins 12 and a plurality of heat exchanger tubes 13 through which a refrigerant flows.
  • the heat radiating fins 12 are long and thin plates extending in the height direction of the casing 4 and are arranged in the circumferential direction of the casing 4 with intervals held between them.
  • the heat exchanger tubes 13 are arranged in the height direction and lateral direction with intervals held between them in both the directions and are connected in series, thereby forming a plurality of flow paths. Furthermore, the heat exchanger tubes 13 penetrate the heat radiating fins 12 to thereby be thermally connected to the heat radiating fins 12.
  • refrigerant pipes 14 connected to the heat exchanger 11 are arranged in the space between one outer circumferential corner part 4c and heat exchanger 11 in a concentrated manner.
  • the refrigerant pipes 14 are connected to a pair of connecting ports 16a and 16b.
  • the connecting ports 16a and 16b are configured in such a manner as to be protruded from one outer circumferential corner part 4c of the casing 4 to the outside of the casing 4 and connected to an outdoor unit through a liquid pipe and gas pipe.
  • a drain pump 17 is accommodated in the casing 4.
  • the drain pump 17 is an element configured to drain dew condensation water created by the heat exchanging operation of the heat exchanger 11 when the indoor unit 1 is operated in the cooling mode out of the unit main body 2.
  • the drain pump 17 is positioned at the lower end part of the casing 4 in the vicinity of another outer circumferential corner part 4c adjacent to the outer circumferential corner part 4c provided with the connecting ports 16a and 16b.
  • the drain piping 18 connected to the drain pump 17 is upwardly routed from the drain pump 17 through the inside of the casing 4.
  • the opening part 6 at the lower end of the casing 4 is closed with a drain pan 20.
  • the drain pan 20 is provided with a main body 21 having heat insulating properties, and sheet material 22 formed on the surface of the main body 21 integral with the main body 21.
  • the main body 21 is an element configured to define the shape of the drain pan 20 and is constituted of, for example, foamed polystyrene which is a kind of foamed plastics.
  • the sheet material 22 is constituted of a synthetic resin material having a thickness of several millimeters, and the stiffness thereof is higher than the main body 21.
  • an ABS resin is used as the synthetic resin material constituting the sheet material 22.
  • the sheet material 22 is formed by injection molding separately from the main body 21.
  • the sheet material 22 is accommodated in an injection mold when the main body 21 is formed by foam molding, and is integrated with the main body 21 in the process of forming the main body 21 by foam molding. Accordingly, the sheet material 22 is subjected to foam pressure when the main body 21 is formed by foam molding.
  • the drain pan 20 has a square frame-shape corresponding to the heat exchanger 11, and is fitted in the inside of the opening part 6 defined by the heat insulating material 5 of the casing 4.
  • the drain pan 20 includes a circular bell-mouth mounting hole 23 positioned directly beneath the suction side of the air blower 10 and peripheral edge part 24 surrounding the bell-mouth mounting hole 23.
  • the peripheral edge part 24 of the drain pan 20 is fitted in the inside of the opening part 6 of the casing 4.
  • peripheral edge part 24 of the drain pan 20 In the peripheral edge part 24 of the drain pan 20, four cutout parts 26 and recessed part 27 in which the lower end part of the heat exchanger 11 comes are formed.
  • Each of the cutout parts 26 has a long and thin shape extending along each of the four sides belonging to the peripheral edge part 24 of the drain pan 20.
  • the cutout parts 26 adjacent to each other in the circumferential direction of the drain pan 20 are kept in a positional relationship in which they are perpendicular to each other.
  • the peripheral edge part 24 of the drain pan 20 is fitted in the inside of the opening part 6 defined by the heat insulating material 5, and hence the areas surrounded by the cutout parts 26 and heat insulating material 5 constitute a plurality of communicating ports 28 through which air passing through the heat exchanger 11 is guided.
  • the recessed part 27 is a groove-like element continuous in the circumferential direction of the drain pan 20, and is positioned on the inner side of the cutout parts 26 with respect to the drain pan 20.
  • the recessed part 27 is defined by an inner circumferential wall 29a, outer circumferential wall 29b, and bottom wall 29c.
  • the inner circumferential wall 29a is raised from the bottom wall 29c so as to surround the bell-mouth mounting hole 23. That is, the inner circumferential wall 29a can be rephrased as a partition wall intervening between the bell-mouth mounting hole 23 and recessed part 27.
  • a swelling part 31 bulging toward the lower end of the heat exchanger 11 is formed.
  • the swelling part 31 is continuously formed in the circumferential direction of the drain pan 20 along the lower end of the heat exchanger 11.
  • a cushion material 32 configure to receive/catch the lower end of the heat exchanger 11 is laid.
  • the swelling part 31 partitions the bottom part of the recessed part 27 into a first groove part 33 and second groove part 34.
  • the first groove part 33 is positioned on the inner side of the inner circumferential surface of the heat exchanger 11 with respect to the heat exchanger 11.
  • the inner circumferential surface of the heat exchanger 11 is positioned on the primary side of the heat exchanger 11 receiving the air blowing out of the air blower 10.
  • the second groove part 34 is positioned directly beneath the heat exchanger 11 so as to surround the first groove part 33. Accordingly, the second groove part 34 is positioned on the outer circumferential surface side of the first groove part 33 with respect to the heat exchanger 11.
  • the outer circumferential surface of the heat exchanger 11 is positioned on the secondary side of the heat exchanger 11, the secondary side being the side from which the air passing through the heat exchanger 11 blows out.
  • the lower end part of the drain pump 17 comes in the second groove part 34 at a position corresponding to one corner part of the drain pan 20.
  • An inlet port 17a opened at the lower end of the drain pump 17 faces the bottom of the second groove part 34.
  • a float switch 35 is arranged at a position adjacent to the drain pump 17.
  • the float switch 35 is an element configured to turn on/off the operation of the drain pump 17 and is positioned at the second groove part 34.
  • the sheet material 22 includes a rib 36 positioned inside the recessed part 27.
  • the rib 36 is upwardly protruded from the upper end of the swelling part 31 in the circumferential direction of the heat exchanger 11.
  • the upper end of the rib 36 extends to a higher position than the lower end of the heat exchanger 11 at a position corresponding to the first groove part 33. Furthermore, the rib 36 breaks at a position corresponding to the drain pump 17.
  • a communicating groove 37 is formed in the swelling part 31 bulging from the bottom wall 29c.
  • the communicating groove 37 is positioned in the vicinity of the drain pump 17.
  • the first groove part 33 and second groove part 34 communicate with each other at a position near the drain pump 17.
  • Such a drain pan 20 is detachably supported at the lower end of the casing 4 through four drain-pan fixing brackets 38 shown in FIG. 2 and FIG. 4 .
  • the drain-pan fixing brackets 38 are screwed to the undersurfaces of the brackets 8.
  • the drain-pan fixing brackets 38 are horizontally protruded from the outer circumferential corner parts 4c of the casing 4 toward the four corner parts of the drain pan 20, and the corner parts of the drain pan 20 are placed on the drain-pan fixing brackets 38. Thereby, the drain pan 20 is supported at the lower end of the casing 4 so that the drain pan 20 may not fall off the opening part 6 of the casing 4.
  • dew condensation water created by the heat exchanging operation of the heat exchanger 11 drops along the heat radiating fins 12. Part of the dropping dew condensation water directly flows into the second groove part 34 of the recessed part 27. The other part of the dew condensation water reaches the top face of the swelling part 31 of the recessed part 27.
  • the rib 36 upwardly protruded from the upper end of the swelling part 31 extends to a higher position than the lower end of the heat exchanger 11 on the primary side of the heat exchanger 11. Accordingly, the dew condensation water reaching the top face of the swelling part 31 cannot flow in the direction to the first groove part 33 due to the existence of the rib 36, and the most part thereof flows into the second groove part 34 through the portions between the lower ends of the heat radiating fins 12.
  • the drain pump 17 When the water level of the dew condensation water flowing into the second groove part 34 reaches the upper limit, the drain pump 17 is operated through the float switch 35. Thereby, the dew condensation water collecting in the second groove part 34 is forcibly drained to the outside of the indoor unit 1 by the drain pump 17.
  • the water inside the drain piping 18 returns from the inlet port 17a of the drain pump 17 to the second groove part 34 of the drain pan 20.
  • the backwater flows into the first groove part 33 through the communicating groove 37. Accordingly, the backwater from the drain piping 18 is separated into both the first groove part 33 and second groove part 34.
  • the backwater returning to the drain pan 20 is dispersed to the wide range of the recessed part 27, and hence it is possible to make the drain pan 20 thin while securing the water retention capacity thereof. Accordingly, it is possible to prevent the height dimension of the casing 4 containing therein the drain pan 20 from increasing, and form the indoor unit 1 thin and compact.
  • the backwater flowing into the first groove part 33 is never cooled by the dew condensation water created at the time of cooling operation.
  • the thickness of the main body 21 is made less than the thickness of the part of the main body 21 positioned on the secondary side of the heat exchanger 11. Accordingly, it is possible to reduce the wall thickness of the inner circumferential wall 29a serving as a partition between the recessed part 27 and bell-mouth mounting hole 23, and expand the bore diameter of the bell-mouth mounting hole 23 correspondingly.
  • an electrical unit 40 is supported on the front face of the side part 4b of the casing 4.
  • the electrical unit 40 is provided with an electrical-component box 41 exposed to the outside of the casing 4, and control circuit 42 accommodated in the electrical-component box 41.
  • the control circuit 42 includes, various electrical components 43 such as a wiring board on which a plurality of IC chips are mounted, reactor, terminal block, and the like.
  • the control circuit 42 is electrically connected to the air blower 10, heat exchanger 11, drain pump 17, and float switch 35 through a plurality of lead wires 44.
  • the electrical unit 40 is positioned outside the casing 4, and hence, as shown in FIG. 10 , the lead wires 44 penetrate the heat insulating material 5 of the casing 4 to be drawn out of the casing 4 to the outside of the casing 4. At this time, if a gap exists at the part at which the lead wires 44 penetrate the heat insulating material 5, there is a possibility of cold air passing through the heat exchanger 11 leaking out of the casing 4 through the gap to thereby cause dew condensation on the casing 4.
  • FIG. 10 is a plan view showing the state where the drain pan 20 is detached from the casing 4
  • FIG. 11 is a cross-sectional view schematically showing the part at which the lead wires 44 penetrate the heat insulating material 5.
  • a plurality of lead wires 44 positioned inside the casing 4 are drawn out of the casing 4 toward the electrical-component box 41 from two portions at the lower end of the heat insulating material 5 defining the opening part 6.
  • Each of the portions at which the lead wires 44 are drawn out has a configuration common to the portions, and hence one of the portions at which the lead wires 44 are drawn out will be described below as a representative.
  • a wiring groove 46 is formed at a lower end part of the heat insulating material 5.
  • the wiring groove 46 penetrates the heat insulating material 5 in the thickness direction, and is opened at the lower end face of the heat insulating material 5.
  • the wiring groove 46 includes a pair of side faces 46a and 46b facing each other, and end face 46c connecting the side faces 46a and 46b to each other.
  • the end face 46c is curved into a form of a circular arc.
  • the lead wires 44 are inserted into the wiring groove 46, and are air-tightly held by the wiring groove 46 through a seal material 47.
  • the seal material 47 of this embodiment is formed by combining first to third seal elements 48, 49, and 50 with each other.
  • the first seal element 48 is constituted of, for example, flexible urethane foam.
  • the first seal element 48 is stuck to the side faces 46a and 46b and end face 46c in such a manner as to continuously cover the side faces 46a and 46b and end face 46c of the wiring groove 46.
  • the first seal element 48 is divided into a first part 48a and second part 48b in order that the first seal element 48 can easily be stuck to the inner surface of the wiring groove 46 by handwork.
  • the first part 48a continuously covers an area from the one side face 46a of the wiring groove 46 to the end face 46c.
  • the second part 48b covers the other side face 46b of the wiring groove 46 and is butted against the first part 48a inside the wiring groove 46.
  • the second seal element 49 is constituted of, for example, polyethylene harder than the first seal element 48.
  • the second seal element 49 is interposed between the end part of the first part 48a of the first seal element 48 and end part of the second part 48b, and air-tightly seals the gap between the end part of the first part 48a and end part of the second part 48b.
  • the second seal element 49 is stuck to the end part of the second part 48b of the first seal element 48.
  • first seal element 48 and second seal element 49 cooperate with each other to air-tightly surround the plurality of lead wires 44 inserted into the wiring groove 46.
  • the lead wires 44 elastically cut into the first part 48a and second part 48b of the first seal element 48, whereby the lead wires 44 are retained inside the wiring groove 46.
  • the third seal element 50 is constituted of, for example, ethylene-propylene-diene rubber (EPDM).
  • the third seal element 50 is divided into a first part 50a and second part 50b.
  • the first part 50a is stuck to the end face of the first part 48a of the first seal element 48 and lower end face of the heat insulating material 5 astride these end faces.
  • the second part 50b is continuously stuck to the end face of the second part 48b of the first seal element 48, end face of the second seal element 49, and lower end face of the heat insulating material 5.
  • the first part 50a and second part 50b of the third seal element 50 are butted against each other on the opening end of the wiring groove 46 so as to close the opening end positioned at the lower end face of the heat insulating material 5.
  • the third seal element 50 holds the first seal element 48 and second seal element 49 from the direction of the opening end of the wiring groove 46 in order that the first seal element 48 and second seal element 49 may not fall off the wiring groove 46.
  • the third seal element 50 is pressed by the peripheral edge part 24 of the drain pan 20.
  • the crushed third seal element 50 air-tightly closes the opening end of the wiring groove 46 positioned at the lower end face of the heat insulating material 5, and the first seal element 48 and second seal element 49 are forced into the wiring groove 46 through the third seal element 50.
  • the first seal element 48 and second seal element 49 positioned inside the wiring groove 46 tuck the lead wires 44 into them, and third seal element 50 tightly seals the opening end of the wiring groove 46 positioned at the lower end face of the heat insulating material 5. Accordingly, it is possible to prevent cold air from leaking out of the wiring groove 46 while air-tightly holding the lead wires 44 in the wiring groove 46.
  • the seal material 47 retains the lead wires 44, and hence a dedicated clamp configured to suppress a lift of the lead wires 44 or define the insertion position of the lead wires 44 becomes unnecessary. Accordingly, the number of components can be held down to a small number, this contributing to reduction in the cost of the indoor unit 1.
  • the work of drawing the lead wires 44 from inside the casing 4 to the outside of the casing 4 can easily be carried out, and the workability at the time of assembly of the indoor unit 1 and at the time of disassembly thereof is improved.
  • a bell mouth 53 is detachably fitted into the bell-mouth mounting hole 23 of the drain pan 20.
  • the bell mouth 53 is an element configured to straighten a flow of air sucked by the air blower 10 and is constituted of a synthetic resin material such as an ABS resin.
  • the bell mouth 53 includes a bell mouth main body 54 having a shape downwardly diameter-expanded into a horn-like form, and flange part 55 horizontally extending outwardly in the radial direction from the lower end part of the bell mouth main body 54 defining the maximum diameter of the bell mouth main body 54.
  • the flange part 55 is formed continuously in the circumferential direction of the bell mouth main body 54. Furthermore, at the tip of the flange part 55, an outer circumferential wall 56 downwardly bent at right angles is formed.
  • the drain pan 20 is provided with a flat seat part 58 configured to receive/catch the flange part 55 of the bell mouth 53.
  • the seat part 58 is positioned at a lower end of the inner circumferential wall 29a interposed between the bell-mouth mounting hole 23 and recessed part 27.
  • the seat part 58 is formed into an annular shape continuous in the circumferential direction of the bell-mouth mounting hole 23.
  • a pair of fixing screws 60 is provided in the seat part 58.
  • the fixing screw 60 is an example of coupling fittings, and is provided with a shank 60a including a thread, and head 60b coaxially positioned at one end of the shank 60a.
  • the head 60b has an outer diameter greater than the shank 60a.
  • the fixing screws 60 are shifted from each other by about 180° in the circumferential direction of the seat part 58 in opposition to each other in the radial direction of the bell-mouth mounting hole 23.
  • a boss part 61 configured to receive and catch the fixing screw 60 is formed integral with the sheet material 22 of the drain pan 20. As shown in FIG. 15 , the boss part 61 is downwardly protruded from the sheet material 22 in such a manner as to penetrate the main body 21 of the drain pan 20, and a lower end face thereof reaches the seat part 58. The shank 60a of the fixing screw 60 is screwed into the boss part 61. Between the head 60b of the fixing screw 60 and seat part 58, a gap in which the flange part 55 of the bell mouth 53 comes is formed.
  • a pair of claw-receiving parts 63 is provided in the seat part 58 of the drain pan 20. As shown in FIG. 16 and FIG. 17 , the claw-receiving part 63 is formed integral with the sheet material 22 of the drain pan 20. The claw-receiving part 63 is downwardly protruded from the sheet material 22 so as to penetrate the main body 21 of the drain pan 20. The protrusion end of the claw-receiving part 63 is exposed at the face of the seat part 58, and a fitting slot 64 is formed at the protrusion end.
  • the fitting slot 64 has a shape opened toward the one side in the circumferential direction of the seat part 58. The inner face of the fitting slot 64 is positioned flush with the seat part 58.
  • the claw-receiving part 63 formed in the sheet material 22 is integrated with the main body 21 in the process of forming the main body 21 by foam molding, and hence the claw-receiving part 63 is subjected to foam pressure when the main body 21 is formed by foam molding.
  • a cavity part 65 is provided inside the claw-receiving part 63.
  • the cavity part 65 is simple space not filled with foamed polystyrene, and has a flat shape in the circumferential direction of the seat part 58.
  • the cavity part 65 is adjacent to the fitting slot 64 and is partitioned off the fitting slot 64 by a first partition wall 66. Furthermore, between the cavity part 65 and main body 21 made of foamed polystyrene, a second partition wall 67 parallel to the first partition wall 66 exists.
  • the second partition wall 67 receives/catches the most part of the foam pressure occurring when the main body 21 is formed by foam molding, and is deformed in such a manner that the second partition wall 67 enters the space of the cavity part 65 according to the magnitude of the foam pressure. Accordingly, it is possible to absorb the foam pressure by the cavity part 65 before the foam pressure is transmitted to the fitting slot 64, and prevent the fitting slot 64 from being deformed.
  • the claw-receiving parts 63 are shifted from each other by about 180° in the circumferential direction of the seat part 58 so as to be opposed to each other in the radial direction of the bell-mouth mounting hole 23 at positions away from the fixing screws 60. Accordingly, the pair of fixing screws 60 and pair of claw-receiving parts 63 are alternately arranged in the circumferential direction of the seat part 58, and the fixing screw 60 and claw-receiving part 63 adjacent to each other are shifted from each other by about 90° in the circumferential direction of the seat part 58.
  • a pair of fixing parts 71 and pair of depressed parts 72 are formed in the flange part 55 positioned at the outer circumferential part of the bell mouth 53.
  • the fixing parts 71 are elements to which the fixing screws 60 protruded from the seat part 58 of the drain pan 20 are detachably coupled, and are provided at positions shifted from each other by about 180° in the circumferential direction of the bell mouth 53 so as to be correspondent to the fixing screws 60.
  • the fixing part 71 is provided with a circular through-hole 73 and slit-like engaging hole 74.
  • the through-hole 73 has such a size that the head 60b of the fixing screw 60 can penetrate.
  • the engaging hole 74 is curved into an arc-like shape in the circumferential direction of the bell mouth 53, and one end thereof in the longitudinal direction communicates with the through-hole 73. Furthermore, the width dimension of the engaging hole 74 in the direction perpendicular to the longitudinal direction thereof has such a size that the shank 60a of the fixing screw 60 can slidably be inserted therein, and is less than the diameter of the head 60b of the fixing screw 60.
  • the depressed parts 72 are shifted from each other by about 180° in the circumferential direction of the bell mouth 53 so as to be opposed to each other in the radial direction of the bell mouth 53 at positions away from the fixing parts 71. Accordingly, as shown in FIG. 12 and FIG. 13 , the pair of fixing parts 71 and pair of depressed parts 72 are alternately arranged in the circumferential direction of the bell mouth 53, and the fixing part 71 and depressed part 72 adjacent to each other are shifted from each other by about 90° in the circumferential direction of the bell mouth 53.
  • the depressed part 72 is inwardly depressed in the radial direction of the bell mouth 53 from the outer peripheral edge of the flange part 55, and has a shape curved into an arc-like shape in the circumferential direction of the flange part 55. Furthermore, a corner part defined by one end of the depressed part 72 and flange part 55 defines a claw part 76. The claw parts 76 are opposed to each other in the radial direction of the bell mouth 53 between the fixing parts 71.
  • the through-hole 73 of the fixing part 71 of the bell mouth 53 is made to coincide with the head 60b of the fixing screw 60 downwardly protruded from the seat part 58 of the drain pan 20. In this state, the bell mouth 53 is pushed up toward the bell-mouth mounting hole 23.
  • the head 60b of the fixing screw 60 penetrates the through-hole 73 of the fixing part 71.
  • the claw-receiving part 63 of the drain pan 20 enters the depressed part 72 of the bell mouth 53.
  • the opening end of the fitting slot 64 of the claw-receiving part 63 is opposed to the claw part 76 of the bell mouth 53.
  • the bell mouth 53 is held by the drain pan 20 at four parts in the circumferential direction.
  • the fixing screws 60 are tightened.
  • the flange part 55 of the bell mouth 53 is held between the heads 60b of the fixing screws 60 and seat part 58 of the drain pan 20, and the bell mouth 53 is fixed to the drain pan 20.
  • the fixing screws 60 are loosened, whereby tightening of the flange part 55 of the bell mouth 53 by the fixing screws 60 is released.
  • the bell mouth 53 is rotated in the direction opposite to the direction at the time of attaching the bell mouth 53.
  • the head 60b of the fixing screw 60 moves from the engaging hole 74 to the through-hole 73, and the claw part 76 withdraws from the fitting slot 64. Accordingly, fixing of the bell mouth 53 to the bell-mouth mounting hole 23 is released, and the bell mouth 53 can downwardly be drawn out of the bell-mouth mounting hole 23.
  • the bell mouth 53 includes rib-like hooking parts 77 at positions corresponding to the depressed parts 72.
  • the hooking part 77 upwardly extends from the upper edge of the depressed part 72, and is provided in a predetermined range in the circumferential direction of the bell mouth 53.
  • the hooking parts 77 are shifted from each other by about 180° in the circumferential direction of the bell mouth 53 so as to be opposed to each other in the radial direction of the bell mouth 53.
  • the seat part 58 of the drain pan 20 against which the top face of the flange part 55 of the bell mouth 53 butts includes a pair of depressed parts 78.
  • the depressed parts 78 are provided at positions corresponding to the hooking parts 77.
  • the depressed part 78 has a shape formed by partially hollowing out the seat part 58 of the drain pan 20 so as to avoid the hooking part 77. Between the inner face of the depressed part 78 and hooking part 77, ample insertion space S is secured.
  • the ceiling panel 3 of the indoor unit 1 is arranged in an attitude along the ceiling not shown. As shown in FIG. 1 through FIG. 3 , the ceiling panel 3 is provided with an inlet grille 80 and frame body 81. The inlet grille 80 is positioned at the central part of the ceiling panel 3.
  • the inlet grille 80 is provided with a square outer frame part 82 and grille part 83 surrounded by the outer frame part 82.
  • the grille part 83 is positioned directly beneath the bell mouth 53 and includes a detachable filter 84.
  • the frame body 81 of the ceiling panel 3 is a square element surrounding the inlet grille 80, and includes first to fourth side parts 85a, 85b, 85c, and 85d, and four corner parts 86a, 86b, 86c, and 86d.
  • Each of the first to fourth side parts 85a, 85b, 85c, and 85d extends along the outer peripheral edge of the outer frame part 82 of the inlet grille 80.
  • the corner parts 86a, 86b, 86c, and 86d are positioned at four corners of the ceiling panel 3, and integrally connect the first to fourth side parts 85a, 85b, 85c, and 85d adjacent to each other in the circumferential direction of the frame body 81 to each other.
  • the square area surrounded by the inner peripheral edges of the first to fourth side parts 85a, 85b, 85c, and 85d defines a work opening 87.
  • the ceiling panel 3 is detachably coupled to the brackets 8 of the casing 4 at the portions of the four corner parts 86a, 86b, 86c, and 86d included in the frame body 81. Thereby, the lower end of the unit main body 2 including the drain pan 20 and bell mouth 53 is covered with the ceiling panel 3.
  • the ceiling panel 3 includes four air outlets 88 from which air passing through the heat exchanger 11 is discharged into the room.
  • the air outlets 88 are formed in the first to fourth side parts 85a, 85b, 85c, and 85d of the frame body 81 in opposition to the four cutout parts 26 included in the drain pan 20.
  • louvers 89 are supported on the frame body 81 of the ceiling panel 3.
  • the louver 89 is an element configured to change the direction in which the air is discharged from the air outlet 88 into the room, and is formed into a flat, long and thin plate-like shape.
  • the louver 89 is rotatable between a closing position at which the louver 89 closes the air outlet 88 and opening position at which the louver 89 inclines to open the air outlet 88. In the state where the louvers 89 are rotated to the closing position, the louvers 89 are configured to become horizontal to thereby entirely cover the first to fourth side parts 85a, 85b, 85c, and 85d of the frame body 81.
  • one side of the outer frame part 82 is selectively coupled to one of the first to fourth side parts 85a, 85b, 85c, and 85d of the frame body 81 so as to be rotatable.
  • the inlet grille 80 is configured to be rotatable between a first position at which the work opening 87 is closed and second position at which the work opening 87 is opened.
  • the inlet grille 80 is configured in such a manner that in the state where the inlet grille 80 is rotated to the second position, the inlet grille 80 can be detached from the frame body 81.
  • a temporary latch 91 (only one of them is shown) is fixed to each of the inner peripheral edges of the first side part 85a and third side part 85c, the inner peripheral edges facing the work opening 87.
  • the temporary latch 91 is an element to be used when the ceiling panel 3 is to be temporarily fixed to the unit main body 2, and is constituted of a sheet-metal material bent into a desired shape.
  • the temporary latch 91 is protruded from an intermediate part of each of the first side part 85a and third side part 85c in the longitudinal direction thereof toward a part above the frame body 81.
  • a hook part 92 downwardly turned down is formed at the top edge of the temporary latch 91.
  • the hook part 92 is inserted in the insertion space S between the hooking part 77 and depressed part 78 from below the bell mouth 53 and is detachably hooked to the hooking part 77 of the bell mouth 53.
  • the ceiling panel 3 is temporarily fixed to the main body 2 in the form in which the ceiling panel 3 is suspended from the bell mouth 53.
  • the head 60b of the fixing screw 60 gets caught on the engaging hole 74 of the bell mouth 53, and the claw part 76 of the bell mouth 53 is fitted into the fitting slot 64 of the drain pan 20. Accordingly, the bell mouth 53 is held by the bell-mouth mounting hole 23 of the drain pan 20 at four parts in the circumferential direction.
  • the number of the fixing screws 60 can be reduced as compared with the conventional case, the number of components is held down correspondingly and the cost of the indoor unit 1 can be reduced.
  • the fixing screw 60 is maintained in the state where the fixing screw 60 is left screwed into the boss part 61 of the drain pan 20 as it is. Accordingly, when the bell mouth 53 is detached from the drain pan 20, the worker is released from the troublesome work of loosening all the fixing screws 60 one by one by handwork, and the fixing screw 60 is never dropped by mistake.
  • the claw part 76 of the bell mouth 53 is smoothly fitted into the fitting slot 64 or is smoothly withdrawn from the fitting slot 64. Therefore, the rotation of the bell mouth 53 is never disturbed, and the workability at the time of attachment/detachment of the bell mouth 53 can be maintained satisfactory.
  • the temporary latch 91 of the ceiling panel 3 it is possible to hook the temporary latch 91 of the ceiling panel 3 directly to the hooking part 77 of the bell mouth 53. Accordingly, it is not necessary to provide the main body 21 made of foamed polystyrene constituting the drain pan 20 with dedicated metal fittings configured to catch the temporary latch 91 by insert molding. Accordingly, it is possible to simplify the configuration of the drain pan 20, this being advantageous from the viewpoint of cost reduction of the indoor unit 1.
  • the configuration is not limited to this, and the fitting part may be omitted.
  • the number of fixing screws and number of claw-receiving parts are not particularly limited and, the numbers can appropriately be changed according to, for example, the size of the bell mouth.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Devices For Blowing Cold Air, Devices For Blowing Warm Air, And Means For Preventing Water Condensation In Air Conditioning Units (AREA)
  • Air Filters, Heat-Exchange Apparatuses, And Housings Of Air-Conditioning Units (AREA)
EP17901212.5A 2017-03-15 2017-03-15 Unité intérieure pour climatiseur Active EP3598020B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2017/010520 WO2018167894A1 (fr) 2017-03-15 2017-03-15 Unité intérieure pour climatiseur

Publications (3)

Publication Number Publication Date
EP3598020A1 true EP3598020A1 (fr) 2020-01-22
EP3598020A4 EP3598020A4 (fr) 2020-11-18
EP3598020B1 EP3598020B1 (fr) 2021-12-22

Family

ID=63521849

Family Applications (1)

Application Number Title Priority Date Filing Date
EP17901212.5A Active EP3598020B1 (fr) 2017-03-15 2017-03-15 Unité intérieure pour climatiseur

Country Status (4)

Country Link
EP (1) EP3598020B1 (fr)
JP (1) JP6705051B2 (fr)
CN (1) CN110418924B (fr)
WO (1) WO2018167894A1 (fr)

Cited By (1)

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EP4119863A4 (fr) * 2020-03-13 2023-04-26 Mitsubishi Electric Corporation Unité intérieure et dispositif de climatisation

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CN209325940U (zh) * 2018-12-14 2019-08-30 广东美的制冷设备有限公司 天花机

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Publication number Priority date Publication date Assignee Title
EP4119863A4 (fr) * 2020-03-13 2023-04-26 Mitsubishi Electric Corporation Unité intérieure et dispositif de climatisation

Also Published As

Publication number Publication date
CN110418924B (zh) 2021-03-09
WO2018167894A1 (fr) 2018-09-20
EP3598020B1 (fr) 2021-12-22
EP3598020A4 (fr) 2020-11-18
JP6705051B2 (ja) 2020-06-03
JPWO2018167894A1 (ja) 2019-11-07
CN110418924A (zh) 2019-11-05

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