EP2208946B1 - Indoor unit for air conditioner - Google Patents
Indoor unit for air conditioner Download PDFInfo
- Publication number
- EP2208946B1 EP2208946B1 EP08849072.7A EP08849072A EP2208946B1 EP 2208946 B1 EP2208946 B1 EP 2208946B1 EP 08849072 A EP08849072 A EP 08849072A EP 2208946 B1 EP2208946 B1 EP 2208946B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- drain pan
- indoor unit
- air
- heat exchangers
- air conditioner
- 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.)
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Links
- 239000003507 refrigerant Substances 0.000 claims description 47
- 239000011810 insulating material Substances 0.000 claims description 16
- 238000005192 partition Methods 0.000 claims description 13
- 238000011144 upstream manufacturing Methods 0.000 claims 1
- 238000004781 supercooling Methods 0.000 description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 13
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 7
- 229910052782 aluminium Inorganic materials 0.000 description 7
- 241001274961 Rubus repens Species 0.000 description 6
- 238000007664 blowing Methods 0.000 description 6
- 230000005494 condensation Effects 0.000 description 4
- 238000009833 condensation Methods 0.000 description 4
- 239000011888 foil Substances 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 3
- 238000001816 cooling Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000011491 glass wool Substances 0.000 description 2
- 230000002452 interceptive effect Effects 0.000 description 2
- 229920003002 synthetic resin Polymers 0.000 description 2
- 239000000057 synthetic resin Substances 0.000 description 2
- 238000007599 discharging Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 238000000638 solvent extraction Methods 0.000 description 1
Images
Classifications
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- 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
-
- 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
- F24F1/0011—Indoor units, e.g. fan coil units characterised by air outlets
- F24F1/0014—Indoor units, e.g. fan coil units characterised by air outlets having two or more outlet openings
-
- 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
- F24F1/005—Indoor units, e.g. fan coil units characterised by mounting arrangements mounted on the floor; standing on the floor
-
- 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
- F24F1/0057—Indoor units, e.g. fan coil units characterised by mounting arrangements mounted in or on a wall
-
- 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
- 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
- F24F1/0068—Indoor units, e.g. fan coil units characterised by the arrangement of refrigerant piping outside the heat exchanger within the unit casing
-
- 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
- F24F1/26—Refrigerant piping
-
- 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
- F24F1/26—Refrigerant piping
- F24F1/32—Refrigerant piping for connecting the separate outdoor units to indoor units
-
- 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
- F24F13/222—Means for preventing condensation or evacuating condensate for 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
- F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
- F24F13/30—Arrangement or mounting of 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
- 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
- F24F1/0033—Indoor units, e.g. fan coil units characterised by fans having two or more fans
Definitions
- the present invention relates to a configuration of an air conditioner indoor unit that can be made slim and compact.
- Patent Document 1 discloses a conventional wall-mounted indoor unit of a general air conditioner.
- the indoor unit has two front and rear drain pans, a plurality of lambdoid cross fin type heat exchangers supported on the drain pans, and a cross flow fan arranged between the heat exchangers. After passing through the heat exchangers, air is blasted into a room through a scroll passage.
- one such indoor unit includes a centrifugal fan having a small axial dimension and a pair of heat exchangers arranged on both sides of the centrifugal fan.
- Each of the heat exchangers is an aluminum layered type, which is small in size and high in heat exchange efficiency. After being drawn from a central portion of a front surface of the indoor unit, air is blasted forward from air outlet ports, which are formed on both sides of the indoor unit through the heat exchangers. This configuration reduces the thickness of the indoor unit.
- a header and refrigerant outlet/inlet ports are concentrated on one side of each heat exchanger, as described in, for example, Patent Document 3. Accordingly, if each heat exchanger is arranged above the header, pipes are concentrated in a lower portion of the indoor unit. If the heat exchanger is arranged below the header, the pipes are concentrated in an upper portion of the indoor unit.
- the size of the indoor unit must be enlarged in order to create the space for accommodating the pipes.
- Patent Document 4 discloses a ceiling-mounted air conditioner according to the preamble of claim 1, that is thinned by reducing the height of a drain pan, the air conditioner having a casing with a substantially oblong shape in a plan view, a heat exchanger, a fan, the drain pan, and a drain pump, and being placed in the casing, along the two long sides of the casing in the plan view, the drain pan placed under the heat exchanger and having drain water receiving sections and a drain water containing section for receiving drain water produced when moisture in the air is condensed at the heat exchanger, the drain pump discharging the drain water from the drain water containing section to the outside of the casing, the drain water containing section and the drain pump being arranged, in the plan view of the casing, at substantially the center in the direction along the long sides of the casing.
- an air conditioner indoor unit is provided according to claim 1.
- dew drops formed on surfaces of the heat exchangers are drained to the drain pan.
- the drain pan thus reliably collects the drained water.
- a number of refrigerant pipes, which are concentrated below the heat exchangers, are received in the space in the drain pan without interfering with other components.
- the indoor unit body thus can be made more compact.
- dew drops formed on the refrigerant pipes are collected in the drain pan without being splashed to the outside.
- a partition plate is arranged between the fan and the drain pan.
- an air flow from the fan is prevented from affecting the refrigerant pipes and changing the phase of the refrigerant flowing in the refrigerant pipes. Further, the air flow from the fan is straightened by the partition plate and smoothly blasted toward the air outlet ports, which are arranged on both sides.
- the partition plate also prevents the air flow from the fan from blowing out of the outlet ports through the drain pan without passing through the heat exchangers.
- the air blowing performance of the indoor unit is thus improved.
- the casing preferably has a back plate, and the drain pan is preferably formed integrally with the back plate of the casing.
- the heat exchangers and the fan are incorporated as an integral body and unitized with the drain pan. Since the heat exchangers and the fan are received in the casing while being unitized, the indoor unit is manufactured, assembled, and maintained easily.
- the two heat exchangers preferably each extend across the corresponding one of the air passages and are inclined in mutually different directions.
- Positioning members for positioning the heat exchangers are preferably arranged on both sides in the drain pan.
- the configuration greatly facilitates the assembly of the heat exchangers with the drain pan, thus improving the production efficiency.
- Stepped portions for positioning the heat exchangers are preferably formed in a bottom portion of the drain pan.
- This configuration greatly facilitates the assembly of the heat exchangers with the drain pan, thus improving the production efficiency.
- Each of the stepped portions of the drain pan is preferably formed by a wide portion corresponding to an upper portion of the drain pan and a narrow portion corresponding to the bottom portion of the drain pan, and a heat insulating material is preferably arranged on an outer surface of the narrow portion formed in the bottom portion of the drain pan.
- This configuration allows the insulating material to be easily mounted and attached, and the stepped portions are used further effectively.
- the air conditioner indoor unit is a twin type formed by a pair of indoor subunits that are arranged side by side.
- the indoor subunits each include a fan and two heat exchangers, which are arranged on both sides of the fan.
- the air conditioner indoor unit has a flat cassette type body casing 1, which is elongated in a lateral direction and thin in a front-rear direction.
- the body casing 1 is formed by a back panel (a back plate) 1a, two side panels (side plates) 1b, a front panel (a front plate) 1c, an upper panel (a top plate) 1d, and a bottom panel (a bottom plate) 1e.
- the back panel 1a forms an attachment surface to which fan motors 8b of turbofans 8, which will be described later, are attached.
- the two indoor subunits which are arranged adjacent to each other, are formed identically. Accordingly, only one of the indoor subunits will be described.
- a circular air inlet port 5 which functions as a bellmouth, is formed in a central portion of a part of the front panel 1c that forms one of the indoor subunits.
- a turbofan 8 serving as a centrifugal fan, which has a small depth, is arranged inside the air inlet port 5.
- Each turbofan 8 has a main plate 8d, a shroud 8c, and a plurality of blades 8a (an impeller), which are arranged between the shroud 8c and the main plate 8d.
- the two of the air outlet ports 7 that are arranged adjacent to each other in a central portion of the body casing 1 are formed as a common outlet port for the two adjacent indoor subunits.
- two air passages 6 extend from each air inlet port 5 having the bellmouth structure and separate toward the corresponding air outlet ports 7, which are arranged on both sides of the air inlet port 5.
- the turbofan 8 corresponding to the shroud 8c is formed in the air passages 6 and at the back of the air inlet port 5. Specifically, the turbofan 8 is received in the air inlet port 5 with a clearance around the turbofan 8.
- the turbofan 8 is attached to the back panel 1a of the body casing 1 with the fan motor 8b, which is arranged inside the impeller.
- the back panel 1a has a necessary height H and is formed integrally with a back plate 16 of a drain pan 15, which is located below the back panel 1a (the back panel 1a is formed by extending the back plate 16, which is the same plate forming the back panel 1a, upward).
- a pair of heat exchangers 9 are located on both sides of each turbofan 8 in the air passages 6.
- the heat exchangers 9 are located at the positions corresponding to the air outlet ports 7, which are arranged below the air passages 6.
- the two heat exchangers 9 are arranged in the corresponding two air passages 6, which extend from the central portion of the body casing 1 toward both sides, in such a manner that the heat exchangers 9 extend across the corresponding air passages 6 and greatly incline in mutually different directions.
- the two heat exchangers 9 are greatly inclined with respect to the corresponding air passages 6. Accordingly, as is clear from Fig. 3 , a necessary heat exchange surface area is effectively ensured, and the width (the depth) of the indoor unit body in the front-rear direction is minimized. As a result, the indoor unit body is made slimmer.
- each of the heat exchangers 9 is formed by a compact aluminum layered type heat exchanger, which includes flat heat transmission pipes (porous pipes) 9a and flat heat-transfer fins (which are, for example, corrugated fins) 9b and exhibits extremely high heat transmission performance.
- a pair of refrigerant headers 20 (20a, 20b) are arranged below each heat exchanger 9.
- a plurality of refrigerant pipes 21a, 21b, 21c, 21d are connected to the corresponding refrigerant headers 20 (20a, 20b) in a concentrated manner.
- each heat exchanger 9 is supported with the refrigerant headers 20, which are arranged at the lower end of the heat exchanger 9, received in the drain pan 15.
- the refrigerant headers 20 are fixed and accurately positioned at predetermined positions on a bottom surface 15a of the drain pan 15 by positioning members 22, 23. In this manner, the heat exchangers 9 are supported by and integrated with the drain pan 15.
- the positioning members 22, 23 include positioning members 22a, 23a, 22b, 23b.
- the positioning members 22b, 23b each have a small height in the vertical direction.
- the height of each positioning member 22a, 23a is greater than the height of each positioning member 22b, 23b.
- the positioning members 22b, 23b each include a tapered surface for setting the inclination angle of the heat exchanger 9.
- Recesses 22c, 23c are each formed by the corresponding positioning members 22a, 23a, 22b, 23b and the inner surface of the drain pan 15.
- Each one of the recesses 22c, 23c is fixedly engaged with the end portion and the outer peripheral portion of the corresponding one of the refrigerant headers 20, which corresponds to the front or rear corner of the heat exchanger 9.
- the recesses 22c, 23c are formed in correspondence with the inclination angles of the corresponding heat exchangers 9.
- the heat exchanger 9 is easily installed in a stable state at a desired height and a desired inclination angle.
- a pair of supercooling heat exchangers 19 are provided.
- the supercooling heat exchangers 19 function as condensers when the air conditioner is in heating operation and as evaporators when the air conditioner is in cooling operation.
- the two supercooling heat exchangers 19 are arranged substantially symmetrically between each turbofan 8 and the heat exchangers 9 arranged on both sides of the turbofan 8.
- each of the supercooling heat exchangers 19 is configured as a small-sized cylindrical heat exchanger with fins, which is configured simply by wrapping a spine fin 19a around a heat exchange tube 21d, which is a continuous refrigerant pipe.
- Each supercooling heat exchanger 19 is arranged in such a manner that the heat exchange tube 21d extends in the vertical direction.
- each vacuum heat insulating material 10 is bonded to the inner surfaces of the back panel 1a, the side panel 1b, and the front panel 1c, which face each heat exchanger 9.
- Each of the vacuum heat insulating materials 10 is flat and a vacuum is formed in the vacuum heat insulating material 10.
- each vacuum heat insulating material 10 has a hollow synthetic resin sheet 10a and an aluminum foil 10c.
- the inside of the resin sheet 10a is filled with a shape retaining glass wool 10b.
- the aluminum foil 10c is bonded to the outer periphery of the sheet 10a.
- the heat exchangers 9, each of which is a compact aluminum layered type and has a high heat exchange efficiency, are arranged on both sides of the corresponding turbofan 8 in the inclined state. After being drawn through each air inlet port 5, which is arranged in a front central portion, air is blasted forward from the air outlet ports 7 on both sides.
- This configuration minimizes the thickness of the indoor unit body.
- the drain pan 15 (the bottom surface 15a), which is shaped like a plate and extends in correspondence with the entire portion of the indoor unit body, is arranged below the two heat exchangers 9 and the associated turbofan 8.
- a large number of refrigerant pipes 21a to 21d connected to the corresponding heat exchangers 9 are accommodated in the drain pan 15 using the vacant space in the drain pan 15 having a predetermined depth.
- each heat exchanger 9 which is the layered type
- the refrigerant headers 20 and the inlet and outlet ports of the refrigerant pipes 21a to 21d are concentrated on one side of the heat exchanger 9. Accordingly, if the heat exchangers 9 are arranged above the refrigerant headers 20 as illustrated in Fig. 7 , the refrigerant pipes 21a to 21d are concentrated below the heat exchangers 9. Contrastingly, if the heat exchangers 9 are arranged below the refrigerant headers 20 as illustrated in Fig. 17 , the refrigerant pipes 21a to 21d are concentrated above the heat exchangers 9. In this case, the indoor unit body must be enlarged in size to ensure the space for accommodating the pipes.
- dew drops formed on the refrigerant pipes may drip and hit a structure such as a fan, and thus may be splashed to the outside of the unit. If a heat insulating material is wrapped around the pipes to prevent dew condensation, the size of the indoor unit will be further enlarged.
- the drain pan 15 is arranged below the two heat exchangers 9, which are arranged for each turbofan 8, and the turbofan 8, with reference to Figs. 4 and 8 , for example.
- the drain pan 15 receives the refrigerant pipes 21a to 21d, which connect each pair of heat exchangers 9 together. In this manner, all of the pipes are received in the drain pan 15, thus solving the above-described problem.
- the condensed water on the surfaces of the heat exchangers 9 is drained to the drain pan 15.
- the drain pan 15 thus reliably collects the condensation water. Further, a large number of refrigerant pipes 21a to 21d, which are concentrated below the heat exchangers 9, are accommodated in the vacant space in the drain pan 15 without interfering with other components.
- dew drops formed on the refrigerant pipes 21a to 21d are collected directly by the drain pan 15 without being splashed to the outside.
- the drain pan 15 is formed integrally with the back panel 1a of the indoor unit casing, as has been described.
- the drain pan 15 is formed integrally with the back panel 1a of the indoor unit casing, using which the turbofans 8 are mounted, the heat exchangers 9 and the associated turbofan 8 are incorporated as an integral body and unitized with the drain pan 15. Accordingly, while being unitized, the drain pan 15, the heat exchangers 9, and the turbofans 8 are accommodated in the body casing 1 of the indoor unit as an integral body. This facilitates the assembly, manufacture, and maintenance of the indoor unit.
- each turbofan 8 it is necessary to partition the air chamber of each turbofan 8 from the space in the drain pan 15 in some way. Specifically, through such partitioning, the air flow from the turbofan 8 must be smoothly straightened toward the corresponding air outlet ports 7 and prevented from affecting the refrigerant pipes 21a to 21d in order to prevent change of the phase of the refrigerant.
- a partition plate 17 is arranged in such a manner as to separate the turbofans 8 and the heat exchangers 9 from the drain pan 15 (and the refrigerant pipes 21a to 21d), as illustrated in Fig. 12 .
- the partition plate 17 is flat in the present embodiment, the partition plate 17 may be formed in an arcuate shape or a scroll shape.
- the partition plate 17 prevents the air flows from the turbofans 8 and the heat exchangers 9 from affecting the refrigerant pipes 21a to 21d. Accordingly, the phase of the refrigerant flowing in the refrigerant pipes 21a to 21d is prevented from changing.
- partition plate 17 smoothly straightens the air flow from each turbofan 8 toward the air outlet ports 7, thus improving the air blowing performance of the turbofan 8. This improves the heat exchange efficiency of each heat exchanger 9.
- the partition plate 17 prevents the air flow from each turbofan 8 from blowing out of the air outlet ports 7 via the drain pan 15 without passing through the corresponding heat exchanger 9.
- front covers 2, 3 are arranged at the front side of the front panel 1c as necessary, as illustrated in, for example, Figs. 1 and 2 .
- the two center front covers 2 cover the air inlet ports 5 and the air outlet ports 7 at the center.
- the two front covers 3 on both sides each cover the corresponding one of the air outlet ports 7, which are located on both sides of the body casing 1.
- the center front covers 2 are each supported by a support member 21, which is configured as, for example, a link, in such a manner that each front cover 2 is selectively opened and closed in the front-read direction (or a direction inclined with respect to the front-rear direction).
- a support member 21 which is configured as, for example, a link, in such a manner that each front cover 2 is selectively opened and closed in the front-read direction (or a direction inclined with respect to the front-rear direction).
- each of the front covers 3 on both sides is supported by a hinge structure in such a manner that each front cover 3 is selectively opened and closed.
- the air outlet ports 7 on both sides of the casing are held open and the air is blown out of the air outlet ports 7.
- the indoor unit as a whole forms a simple slim cabinet structure having a flat front surface.
- the second embodiment is different from the first embodiment in that the drain pan 15 includes stepped portions 15b.
- positioning members 24, 25 for setting inclination angles are arranged in the drain pan 15.
- the stepped portions 15b are formed in a lower portion of the drain pan 15, with reference to Figs. 13 to 15 .
- the upper stepped surface of each stepped portion 15b functions as a positioning member for a height direction.
- Each stepped portion 15b is formed by a wide portion corresponding to an upper portion of the drain pan 15 and a narrow portion corresponding to a bottom portion of the drain pan 15.
- a vacuum heat insulating material 10 having a minimized thickness is arranged at the outer surface of the narrow portions of the stepped portions 15b (the outer surface of the bottom portion of the drain pan 15), as illustrated in, for example, Fig. 16 .
- the vacuum heat insulating material 10 is formed by, for example, a hollow sheet 10a formed of synthetic resin and an aluminum foil 10c.
- the inside of the hollow sheet 10a is filled with a shape retaining glass wool 10b.
- the aluminum foil 10c is bonded to the outer periphery of the sheet 10a.
- a heat insulating material is bonded to the drain pan 15 in order to prevent dew condensation.
- the positioning members 22b, 23b of the above-described first embodiment are replaced by the stepped portions 15b formed in the drain pan 15.
- Each stepped portion 15b functions as positioning means for the height direction.
- the other portions of the second embodiment are configured identically to the corresponding portions of the second embodiment.
- the second embodiment has the same advantages as those of the first embodiment.
- each supercooling heat exchanger 19 of the first embodiment is configured by a flat cross fin coil type supercooling heat exchanger 19, which is illustrated in, for example, Figs. 18 to 20 , instead of the heat exchanger having the cylindrical spine fin.
- the thickness of the cross fin coil type supercooling heat exchanger 19 is significantly less than the aforementioned spine fin type supercooling heat exchanger. This configuration saves space and reduces the pressure loss of each turbofan 8, thus raising heat exchange performance by 50% or more for a constant fan resistance. Accordingly, the supercooling heat exchange efficiency is improved.
- refrigerant pipes 21d having U-shaped pipe structures may be employed. This makes it possible to arrange all of the refrigerant pipes 21a to 21d extending from the refrigerant headers 20, which include the refrigerant pipe 21d connecting the adjacent supercooling heat exchangers 19 to each other, in the drain pan 15. This allows all of the refrigerant pipes 21a to 21d to be accommodated in the drain pan 15, and thus brings about the advantage that the indoor unit is further reduced in size. Also, dew drops formed on the surfaces of the refrigerant pipes 21a to 21d are completely prevented from being splashed to the outside of the indoor unit.
- each cross fin coil type supercooling heat exchanger 19 a plate fin extends perpendicular to a heat transmission pipe.
- the portion corresponding to the plate fin is arranged horizontally, thus causing a minor problem about water drainage.
- each supercooling heat exchanger 19 in a slanted manner so that the supercooling heat exchanger 19 is slightly inclined in a horizontal direction with respect to a vertical direction, instead of installing the supercooling heat exchanger 19 linearly in the vertical direction.
- the other portions of the third embodiment are configured identically to the corresponding portions of the first embodiment.
- the third embodiment has the same advantages as those of the first embodiment.
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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)
- 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)
- Air-Conditioning Room Units, And Self-Contained Units In General (AREA)
Description
- The present invention relates to a configuration of an air conditioner indoor unit that can be made slim and compact.
- Patent Document 1, for example, discloses a conventional wall-mounted indoor unit of a general air conditioner. The indoor unit has two front and rear drain pans, a plurality of lambdoid cross fin type heat exchangers supported on the drain pans, and a cross flow fan arranged between the heat exchangers. After passing through the heat exchangers, air is blasted into a room through a scroll passage.
- However, since the heat exchangers and the cross flow fan are arranged and aligned in a front-rear direction, there is a limit on the reduction the thickness of the indoor unit.
- To solve this problem, the applicant of the present invention has attempted to minimize the thickness of indoor units, for example, as described in the indoor units of
Patent Documents - In the layered type heat exchangers, a header and refrigerant outlet/inlet ports are concentrated on one side of each heat exchanger, as described in, for example,
Patent Document 3. Accordingly, if each heat exchanger is arranged above the header, pipes are concentrated in a lower portion of the indoor unit. If the heat exchanger is arranged below the header, the pipes are concentrated in an upper portion of the indoor unit. - However, when the pipes are arranged in the upper portion, the size of the indoor unit must be enlarged in order to create the space for accommodating the pipes.
- Also, when the air conditioner is in cooling operation, condensed water on surfaces of the pipes drips. It is likely that the dew drops may hit a component such as a fan and be splashed to the outside of the indoor unit. If a heat insulating material is wrapped around the pipes in order to prevent water condensation, the size of the indoor unit is further enlarged.
- Moreover,
Patent Document 4 discloses a ceiling-mounted air conditioner according to the preamble of claim 1, that is thinned by reducing the height of a drain pan, the air conditioner having a casing with a substantially oblong shape in a plan view, a heat exchanger, a fan, the drain pan, and a drain pump, and being placed in the casing, along the two long sides of the casing in the plan view, the drain pan placed under the heat exchanger and having drain water receiving sections and a drain water containing section for receiving drain water produced when moisture in the air is condensed at the heat exchanger, the drain pump discharging the drain water from the drain water containing section to the outside of the casing, the drain water containing section and the drain pump being arranged, in the plan view of the casing, at substantially the center in the direction along the long sides of the casing. - Patent Document 1: Japanese Laid-Open Utility Model Publication No.
5-8316 - Patent Document 2: Japanese Laid-Open Patent Publication No.
2006-29702 - Patent Document 3: Japanese Laid-Open Patent Publication No.
2006-336909 - Patent Document 4:
WO 2007/108435 A1 - Accordingly, it is an objective of the present invention to provide an air conditioner indoor unit that can be effectively made slimmer and more compact.
- To achieve the foregoing objective and in accordance with one aspect of the present invention, an air conditioner indoor unit is provided according to claim 1. In this configuration, dew drops formed on surfaces of the heat exchangers are drained to the drain pan. The drain pan thus reliably collects the drained water. Also, a number of refrigerant pipes, which are concentrated below the heat exchangers, are received in the space in the drain pan without interfering with other components.
- Accordingly, it is unnecessary to create additional space for the refrigerant pipes. The indoor unit body thus can be made more compact.
- Further, dew drops formed on the refrigerant pipes are collected in the drain pan without being splashed to the outside.
- Additionally, a partition plate is arranged between the fan and the drain pan.
- In this configuration, an air flow from the fan is prevented from affecting the refrigerant pipes and changing the phase of the refrigerant flowing in the refrigerant pipes. Further, the air flow from the fan is straightened by the partition plate and smoothly blasted toward the air outlet ports, which are arranged on both sides.
- The partition plate also prevents the air flow from the fan from blowing out of the outlet ports through the drain pan without passing through the heat exchangers.
- The air blowing performance of the indoor unit is thus improved.
- The casing preferably has a back plate, and the drain pan is preferably formed integrally with the back plate of the casing.
- In this configuration, the heat exchangers and the fan are incorporated as an integral body and unitized with the drain pan. Since the heat exchangers and the fan are received in the casing while being unitized, the indoor unit is manufactured, assembled, and maintained easily.
- The two heat exchangers preferably each extend across the corresponding one of the air passages and are inclined in mutually different directions.
- In this configuration, a necessary heat exchange surface area is ensured in the indoor unit and the thickness of the indoor unit is minimized. Accordingly, the indoor unit becomes slimmer.
- Positioning members for positioning the heat exchangers are preferably arranged on both sides in the drain pan.
- The configuration greatly facilitates the assembly of the heat exchangers with the drain pan, thus improving the production efficiency.
- Stepped portions for positioning the heat exchangers are preferably formed in a bottom portion of the drain pan.
- This configuration greatly facilitates the assembly of the heat exchangers with the drain pan, thus improving the production efficiency.
- Each of the stepped portions of the drain pan is preferably formed by a wide portion corresponding to an upper portion of the drain pan and a narrow portion corresponding to the bottom portion of the drain pan, and a heat insulating material is preferably arranged on an outer surface of the narrow portion formed in the bottom portion of the drain pan.
- This configuration allows the insulating material to be easily mounted and attached, and the stepped portions are used further effectively.
-
-
Fig. 1 is a perspective view showing an air conditioner indoor unit, as a whole, according to a first embodiment of the present invention; -
Fig. 2 is a cross-sectional view showing the indoor unit illustrated inFig. 1 with a front cover in an open state; -
Fig. 3 is a cross-sectional plan view showing the indoor unit ofFig. 1 ; -
Fig. 4 is a perspective view showing the internal structure of the indoor unit ofFig. 1 ;Fig. 5 is a perspective view showing the configuration of a main heat exchanger of the indoor unit ofFig. 1 ; -
Fig. 6 is a perspective view showing the configuration of an auxiliary heat exchanger of the indoor unit ofFig. 1 ; -
Fig. 7 is a perspective view showing the arrangement of refrigerant pipes in the indoor unit ofFig. 1 ; -
Fig. 8 is a perspective view showing the refrigerant pipes illustrated inFig. 7 in a state received in a drain pan; -
Fig. 9 is a plan view showing the configuration of a positioning portion of the heat exchanger of the indoor unit ofFig. 1 ; -
Fig. 10 is a longitudinal cross-sectional view showing the positioning portion illustrated inFig. 9 ; -
Fig. 11 is a longitudinal cross-sectional view showing the positioning portion ofFig. 9 as viewed from the side; -
Fig. 12 is a longitudinal cross-sectional view showing the indoor unit ofFig. 1 with a partition plate installed, as viewed from the front; -
Fig. 13 is a plan view showing a positioning portion of a heat exchanger of an air conditioner indoor unit according to a second embodiment of the present invention; -
Fig. 14 is a longitudinal cross-sectional view showing the positioning portion illustrated inFig. 13 ; -
Fig. 15 is a longitudinal cross-sectional view showing the positioning portion ofFig. 13 as viewed from the side; -
Fig. 16 is a cross-sectional view showing the configuration of a heat insulating material bonded to a lower surface of the positioning portion ofFig. 13 ; -
Fig. 17 is a perspective view showing an example of the layout of refrigerant pipes of an air conditioner indoor unit according to the present invention; -
Fig. 18 is a perspective view showing the configuration of the interior of an air conditioner indoor unit, as a whole, according to a third embodiment of the present invention; -
Fig. 19 is a perspective view showing the arrangement of refrigerant pipes of the indoor unit illustrated inFig. 18 ; and -
Fig. 20 is a perspective view showing the refrigerant pipes illustrated inFig. 19 received in a drain pan as in the state (the integrated state) illustrated inFig. 8 . - The configuration of an air conditioner indoor unit according to a first embodiment of the present invention will now be described with reference to
Figs. 1 to 12 . - As illustrated in
Figs. 1 to 3 , the air conditioner indoor unit is a twin type formed by a pair of indoor subunits that are arranged side by side. The indoor subunits each include a fan and two heat exchangers, which are arranged on both sides of the fan. - The air conditioner indoor unit has a flat cassette type body casing 1, which is elongated in a lateral direction and thin in a front-rear direction. The body casing 1 is formed by a back panel (a back plate) 1a, two side panels (side plates) 1b, a front panel (a front plate) 1c, an upper panel (a top plate) 1d, and a bottom panel (a bottom plate) 1e. The
back panel 1a forms an attachment surface to whichfan motors 8b ofturbofans 8, which will be described later, are attached. - Out of these
panels panels back panel 1a, are formed by a single continuous plate. - The two indoor subunits, which are arranged adjacent to each other, are formed identically. Accordingly, only one of the indoor subunits will be described.
- As illustrated in
Fig. 3 , a circularair inlet port 5, which functions as a bellmouth, is formed in a central portion of a part of thefront panel 1c that forms one of the indoor subunits. Aturbofan 8 serving as a centrifugal fan, which has a small depth, is arranged inside theair inlet port 5. - Each
turbofan 8 has amain plate 8d, ashroud 8c, and a plurality ofblades 8a (an impeller), which are arranged between theshroud 8c and themain plate 8d. - A pair of rectangular
air outlet ports 7, each of which has a predetermined width and extends in a vertical direction, are formed on both sides of eachair inlet port 5 of thefront panel 1c. The two of theair outlet ports 7 that are arranged adjacent to each other in a central portion of the body casing 1 are formed as a common outlet port for the two adjacent indoor subunits. - In the body casing 1, two
air passages 6 extend from eachair inlet port 5 having the bellmouth structure and separate toward the correspondingair outlet ports 7, which are arranged on both sides of theair inlet port 5. Theturbofan 8 corresponding to theshroud 8c is formed in theair passages 6 and at the back of theair inlet port 5. Specifically, theturbofan 8 is received in theair inlet port 5 with a clearance around theturbofan 8. Theturbofan 8 is attached to theback panel 1a of the body casing 1 with thefan motor 8b, which is arranged inside the impeller. - As illustrated in
Fig. 4 , for example, theback panel 1a has a necessary height H and is formed integrally with aback plate 16 of adrain pan 15, which is located below theback panel 1a (theback panel 1a is formed by extending theback plate 16, which is the same plate forming theback panel 1a, upward). - With reference to
Fig. 3 , a pair ofheat exchangers 9 are located on both sides of eachturbofan 8 in theair passages 6. Theheat exchangers 9 are located at the positions corresponding to theair outlet ports 7, which are arranged below theair passages 6. The twoheat exchangers 9 are arranged in the corresponding twoair passages 6, which extend from the central portion of the body casing 1 toward both sides, in such a manner that theheat exchangers 9 extend across the correspondingair passages 6 and greatly incline in mutually different directions. - As has been described, the two
heat exchangers 9 are greatly inclined with respect to thecorresponding air passages 6. Accordingly, as is clear fromFig. 3 , a necessary heat exchange surface area is effectively ensured, and the width (the depth) of the indoor unit body in the front-rear direction is minimized. As a result, the indoor unit body is made slimmer. - In the present embodiment, as illustrated in, for example,
Fig. 5 , each of theheat exchangers 9 is formed by a compact aluminum layered type heat exchanger, which includes flat heat transmission pipes (porous pipes) 9a and flat heat-transfer fins (which are, for example, corrugated fins) 9b and exhibits extremely high heat transmission performance. A pair of refrigerant headers 20 (20a, 20b) are arranged below eachheat exchanger 9. A plurality ofrefrigerant pipes Fig. 7 ) are connected to the corresponding refrigerant headers 20 (20a, 20b) in a concentrated manner. - As illustrated in, for example,
Figs. 4 and9 to 11 , eachheat exchanger 9 is supported with therefrigerant headers 20, which are arranged at the lower end of theheat exchanger 9, received in thedrain pan 15. Specifically, therefrigerant headers 20 are fixed and accurately positioned at predetermined positions on abottom surface 15a of thedrain pan 15 by positioningmembers heat exchangers 9 are supported by and integrated with thedrain pan 15. - The
positioning members positioning members positioning members member member positioning members heat exchanger 9.Recesses positioning members drain pan 15. Each one of therecesses refrigerant headers 20, which corresponds to the front or rear corner of theheat exchanger 9. Therecesses corresponding heat exchangers 9. - Accordingly, by pressing the
refrigerant headers 20 of eachheat exchanger 9 into therecesses refrigerant headers 20 with therecesses Figs. 9 to 11 , theheat exchanger 9 is easily installed in a stable state at a desired height and a desired inclination angle. - Further, in the present embodiment, as illustrated in
Figs. 4 and7 , for example, a pair ofsupercooling heat exchangers 19 are provided. The supercoolingheat exchangers 19 function as condensers when the air conditioner is in heating operation and as evaporators when the air conditioner is in cooling operation. The twosupercooling heat exchangers 19 are arranged substantially symmetrically between eachturbofan 8 and theheat exchangers 9 arranged on both sides of theturbofan 8. With reference toFig. 6 , each of thesupercooling heat exchangers 19 is configured as a small-sized cylindrical heat exchanger with fins, which is configured simply by wrapping aspine fin 19a around aheat exchange tube 21d, which is a continuous refrigerant pipe. Each supercoolingheat exchanger 19 is arranged in such a manner that theheat exchange tube 21d extends in the vertical direction. - In the body casing 1, a vacuum
heat insulating material 10 is bonded to the inner surfaces of theback panel 1a, theside panel 1b, and thefront panel 1c, which face eachheat exchanger 9. Each of the vacuumheat insulating materials 10 is flat and a vacuum is formed in the vacuumheat insulating material 10. With reference to, for example,Figs. 16 , which will be explained below, each vacuumheat insulating material 10 has a hollowsynthetic resin sheet 10a and analuminum foil 10c. The inside of theresin sheet 10a is filled with a shape retainingglass wool 10b. Thealuminum foil 10c is bonded to the outer periphery of thesheet 10a. - As has been described, in the present embodiment, the
heat exchangers 9, each of which is a compact aluminum layered type and has a high heat exchange efficiency, are arranged on both sides of thecorresponding turbofan 8 in the inclined state. After being drawn through eachair inlet port 5, which is arranged in a front central portion, air is blasted forward from theair outlet ports 7 on both sides. This configuration minimizes the thickness of the indoor unit body. Further, as illustrated inFig. 4 (a view from front) andFig. 8 (a view from behind without the portion corresponding to the back plate 16), the drain pan 15 (thebottom surface 15a), which is shaped like a plate and extends in correspondence with the entire portion of the indoor unit body, is arranged below the twoheat exchangers 9 and the associatedturbofan 8. A large number ofrefrigerant pipes 21a to 21d connected to thecorresponding heat exchangers 9 are accommodated in thedrain pan 15 using the vacant space in thedrain pan 15 having a predetermined depth. - That is, as has been described, in each
heat exchanger 9, which is the layered type, therefrigerant headers 20 and the inlet and outlet ports of therefrigerant pipes 21a to 21d are concentrated on one side of theheat exchanger 9. Accordingly, if theheat exchangers 9 are arranged above therefrigerant headers 20 as illustrated inFig. 7 , therefrigerant pipes 21a to 21d are concentrated below theheat exchangers 9. Contrastingly, if theheat exchangers 9 are arranged below therefrigerant headers 20 as illustrated inFig. 17 , therefrigerant pipes 21a to 21d are concentrated above theheat exchangers 9. In this case, the indoor unit body must be enlarged in size to ensure the space for accommodating the pipes. Also, when the air conditioner is in cooling operation, dew drops formed on the refrigerant pipes may drip and hit a structure such as a fan, and thus may be splashed to the outside of the unit. If a heat insulating material is wrapped around the pipes to prevent dew condensation, the size of the indoor unit will be further enlarged. - To solve this problem, in the present embodiment, the
drain pan 15 is arranged below the twoheat exchangers 9, which are arranged for eachturbofan 8, and theturbofan 8, with reference toFigs. 4 and8 , for example. Thedrain pan 15 receives therefrigerant pipes 21a to 21d, which connect each pair ofheat exchangers 9 together. In this manner, all of the pipes are received in thedrain pan 15, thus solving the above-described problem. - In this configuration, the condensed water on the surfaces of the
heat exchangers 9 is drained to thedrain pan 15. Thedrain pan 15 thus reliably collects the condensation water. Further, a large number ofrefrigerant pipes 21a to 21d, which are concentrated below theheat exchangers 9, are accommodated in the vacant space in thedrain pan 15 without interfering with other components. - Accordingly, it is unnecessary to create additional space for the pipes. This further reduces the size of the indoor unit body in size.
- Also, dew drops formed on the
refrigerant pipes 21a to 21d are collected directly by thedrain pan 15 without being splashed to the outside. - In the above-described configuration, the
drain pan 15 is formed integrally with theback panel 1a of the indoor unit casing, as has been described. - Since the
drain pan 15 is formed integrally with theback panel 1a of the indoor unit casing, using which theturbofans 8 are mounted, theheat exchangers 9 and the associatedturbofan 8 are incorporated as an integral body and unitized with thedrain pan 15. Accordingly, while being unitized, thedrain pan 15, theheat exchangers 9, and theturbofans 8 are accommodated in the body casing 1 of the indoor unit as an integral body. This facilitates the assembly, manufacture, and maintenance of the indoor unit. - However, when the above-described configuration is employed, it is necessary to partition the air chamber of each
turbofan 8 from the space in thedrain pan 15 in some way. Specifically, through such partitioning, the air flow from theturbofan 8 must be smoothly straightened toward the correspondingair outlet ports 7 and prevented from affecting therefrigerant pipes 21a to 21d in order to prevent change of the phase of the refrigerant. - It is also necessary to prevent the air flow from each
turbofan 8 from blowing out of theair outlet ports 7 through thedrain pan 15 without passing through thecorresponding heat exchanger 9. - To satisfy these needs, in the present embodiment, a
partition plate 17 is arranged in such a manner as to separate theturbofans 8 and theheat exchangers 9 from the drain pan 15 (and therefrigerant pipes 21a to 21d), as illustrated inFig. 12 . This prevents therefrigerant pipes 21a to 21d from being cooled by the air flow from theturbofans 8. Also, by shaping thepartition plate 17 as needed in correspondence with the shape of eachturbofan 8, flow straightening performance is improved so that air blowing performance is improved. Although thepartition plate 17 is flat in the present embodiment, thepartition plate 17 may be formed in an arcuate shape or a scroll shape. - In this configuration, the
partition plate 17 prevents the air flows from theturbofans 8 and theheat exchangers 9 from affecting therefrigerant pipes 21a to 21d. Accordingly, the phase of the refrigerant flowing in therefrigerant pipes 21a to 21d is prevented from changing. - Further, the
partition plate 17 smoothly straightens the air flow from eachturbofan 8 toward theair outlet ports 7, thus improving the air blowing performance of theturbofan 8. This improves the heat exchange efficiency of eachheat exchanger 9. - Also, the
partition plate 17 prevents the air flow from eachturbofan 8 from blowing out of theair outlet ports 7 via thedrain pan 15 without passing through thecorresponding heat exchanger 9. - Additionally, in the present embodiment, front covers 2, 3 are arranged at the front side of the
front panel 1c as necessary, as illustrated in, for example,Figs. 1 and2 . In this case, for example, the two center front covers 2 cover theair inlet ports 5 and theair outlet ports 7 at the center. The twofront covers 3 on both sides each cover the corresponding one of theair outlet ports 7, which are located on both sides of the body casing 1. - The center front covers 2 are each supported by a
support member 21, which is configured as, for example, a link, in such a manner that eachfront cover 2 is selectively opened and closed in the front-read direction (or a direction inclined with respect to the front-rear direction). When the front covers 2 are open, as illustrated inFig. 2 , air is drawn into theair inlet ports 5 from above and below in the vertical direction. In this state, the commonair outlet ports 7, which are located at the center, are held open and the air is blown out of theair outlet ports 7. - In contrast, each of the front covers 3 on both sides is supported by a hinge structure in such a manner that each
front cover 3 is selectively opened and closed. When the front covers 3 are open, theair outlet ports 7 on both sides of the casing are held open and the air is blown out of theair outlet ports 7. - If the front covers 2, 3 are all closed as illustrated in
Fig. 1 , the indoor unit as a whole forms a simple slim cabinet structure having a flat front surface. - The configuration of an air conditioner indoor unit according to a second embodiment of the present invention will hereafter be explained with reference to
Figs. 13 to 16 . - The second embodiment is different from the first embodiment in that the
drain pan 15 includes steppedportions 15b. Specifically, positioningmembers drain pan 15. The steppedportions 15b are formed in a lower portion of thedrain pan 15, with reference toFigs. 13 to 15 . The upper stepped surface of each steppedportion 15b functions as a positioning member for a height direction. Each steppedportion 15b is formed by a wide portion corresponding to an upper portion of thedrain pan 15 and a narrow portion corresponding to a bottom portion of thedrain pan 15. A vacuumheat insulating material 10 having a minimized thickness is arranged at the outer surface of the narrow portions of the steppedportions 15b (the outer surface of the bottom portion of the drain pan 15), as illustrated in, for example,Fig. 16 . - The vacuum
heat insulating material 10 is formed by, for example, ahollow sheet 10a formed of synthetic resin and analuminum foil 10c. The inside of thehollow sheet 10a is filled with a shape retainingglass wool 10b. Thealuminum foil 10c is bonded to the outer periphery of thesheet 10a. - Typically, a heat insulating material is bonded to the
drain pan 15 in order to prevent dew condensation. However, to provide a slim indoor unit such as the above-described one, it is required to decrease the thickness of the heat insulating material (particularly in the front side and the backside), too. To meet this requirement, thepositioning members portions 15b formed in thedrain pan 15. Each steppedportion 15b functions as positioning means for the height direction. Further, by bonding theheat insulating material 10 to the outer surface of the steppedportion 15b, theheat insulating material 10 is prevented from projecting outward with respect to the outer surface of thedrain pan 15 as much as possible. - The other portions of the second embodiment are configured identically to the corresponding portions of the second embodiment. The second embodiment has the same advantages as those of the first embodiment.
- The configuration of an air conditioner indoor unit according to a third embodiment of the present invention will now be described with reference to
Figs. 18 to 20 . - The third embodiment is characterized in that each supercooling
heat exchanger 19 of the first embodiment is configured by a flat cross fin coil type supercoolingheat exchanger 19, which is illustrated in, for example,Figs. 18 to 20 , instead of the heat exchanger having the cylindrical spine fin. - Through such configuration, the supercooling heat exchange efficiency is further improved.
- Specifically, the thickness of the cross fin coil type supercooling
heat exchanger 19 is significantly less than the aforementioned spine fin type supercooling heat exchanger. This configuration saves space and reduces the pressure loss of eachturbofan 8, thus raising heat exchange performance by 50% or more for a constant fan resistance. Accordingly, the supercooling heat exchange efficiency is improved. - For the cross fin coil type supercooling
heat exchangers 19,refrigerant pipes 21d having U-shaped pipe structures may be employed. This makes it possible to arrange all of therefrigerant pipes 21a to 21d extending from therefrigerant headers 20, which include therefrigerant pipe 21d connecting the adjacentsupercooling heat exchangers 19 to each other, in thedrain pan 15. This allows all of therefrigerant pipes 21a to 21d to be accommodated in thedrain pan 15, and thus brings about the advantage that the indoor unit is further reduced in size. Also, dew drops formed on the surfaces of therefrigerant pipes 21a to 21d are completely prevented from being splashed to the outside of the indoor unit. - In each cross fin coil type supercooling
heat exchanger 19, a plate fin extends perpendicular to a heat transmission pipe. When thesupercooling heat exchanger 19 is installed to be upright, the portion corresponding to the plate fin is arranged horizontally, thus causing a minor problem about water drainage. - To promote the water drainage of the plate fin, it is preferable to install each supercooling
heat exchanger 19 in a slanted manner so that thesupercooling heat exchanger 19 is slightly inclined in a horizontal direction with respect to a vertical direction, instead of installing thesupercooling heat exchanger 19 linearly in the vertical direction. - The other portions of the third embodiment are configured identically to the corresponding portions of the first embodiment. The third embodiment has the same advantages as those of the first embodiment.
Claims (6)
- An air conditioner indoor unit comprising a box-shaped casing (1), an air inlet port (5), a pair of air outlet ports (7), a pair of air passages (6) formed in the casing (1) and extending from the air inlet port (5) to the air outlet ports (7), a fan (8) that is arranged upstream from the air passages (6) and corresponds to the air inlet port (5), a pair of heat exchangers (9) that are arranged downstream from the air passages (6) and correspond to the air outlet ports (7), and a refrigerant pipe (21a, 21b, 21c, 21d) connecting the heat exchangers (9) to each other, wherein a drain pan (15) is arranged below the heat exchangers (9) and the fan (8), characterized in that:the air inlet port (5) is formed in a central portion of a front surface of the casing (1), the pair of air outlet ports (7) is formed on both sides of the front surface of the casing (1), wherein the refrigerant pipe (21a, 21b, 21c, 21d) is received on the drain pan (15), and a partition plate (17) is arranged between the fan (8) and the drain pan (15).
- The air conditioner indoor unit according to claim 1, characterized in that the casing (1) has a back plate (16), the drain pan (15) being formed integrally with the back plate (16) of the casing (1).
- The air conditioner indoor unit according to any one of claims 1 to 2, characterized in that the two heat exchangers (9) each extend across the corresponding one of the air passages (6) and are inclined in mutually different directions.
- The air conditioner indoor unit according to any one of claims 1 to 3, characterized in that positioning members (22, 23, 24, 25) for positioning the heat exchangers (9) are arranged on both sides in the drain pan (15).
- The air conditioner indoor unit according to any one of claims 1 to 3, characterized in that stepped portions (15b) for positioning the heat exchangers (9) are formed in a bottom portion of the drain pan (15).
- The air conditioner indoor unit according to claim 5, characterized in that each of the stepped portions (15b) of the drain pan (15) is formed by a wide portion corresponding to an upper portion of the drain pan (15) and a narrow portion corresponding to the bottom portion of the drain pan (15), a heat insulating material (10) being arranged on an outer surface of the narrow portion formed in the bottom portion of the drain pan (15).
Applications Claiming Priority (3)
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JP2007292765 | 2007-11-12 | ||
JP2008245053A JP5422953B2 (en) | 2007-11-12 | 2008-09-25 | Indoor unit for air conditioner |
PCT/JP2008/070029 WO2009063770A1 (en) | 2007-11-12 | 2008-11-04 | Indoor unit for air conditioner |
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EP2208946A1 EP2208946A1 (en) | 2010-07-21 |
EP2208946A4 EP2208946A4 (en) | 2014-07-02 |
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EP (1) | EP2208946B1 (en) |
JP (1) | JP5422953B2 (en) |
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2008
- 2008-09-25 JP JP2008245053A patent/JP5422953B2/en active Active
- 2008-11-04 EP EP08849072.7A patent/EP2208946B1/en active Active
- 2008-11-04 AU AU2008321997A patent/AU2008321997B2/en active Active
- 2008-11-04 CN CN2008801109413A patent/CN101821557B/en active Active
- 2008-11-04 ES ES08849072.7T patent/ES2642870T3/en active Active
- 2008-11-04 KR KR1020107007975A patent/KR20100056556A/en not_active Application Discontinuation
- 2008-11-04 US US12/678,685 patent/US20100199700A1/en not_active Abandoned
- 2008-11-04 WO PCT/JP2008/070029 patent/WO2009063770A1/en active Application Filing
Non-Patent Citations (1)
Title |
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None * |
Also Published As
Publication number | Publication date |
---|---|
CN101821557A (en) | 2010-09-01 |
EP2208946A1 (en) | 2010-07-21 |
JP5422953B2 (en) | 2014-02-19 |
WO2009063770A1 (en) | 2009-05-22 |
EP2208946A4 (en) | 2014-07-02 |
KR20100056556A (en) | 2010-05-27 |
JP2009139078A (en) | 2009-06-25 |
AU2008321997B2 (en) | 2011-03-17 |
CN101821557B (en) | 2013-04-24 |
ES2642870T3 (en) | 2017-11-20 |
AU2008321997A1 (en) | 2009-05-22 |
US20100199700A1 (en) | 2010-08-12 |
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