EP1041351B1 - Indoor unit for air conditioner - Google Patents

Indoor unit for air conditioner Download PDF

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Publication number
EP1041351B1
EP1041351B1 EP98954796A EP98954796A EP1041351B1 EP 1041351 B1 EP1041351 B1 EP 1041351B1 EP 98954796 A EP98954796 A EP 98954796A EP 98954796 A EP98954796 A EP 98954796A EP 1041351 B1 EP1041351 B1 EP 1041351B1
Authority
EP
European Patent Office
Prior art keywords
air
curved vanes
turbo fan
indoor unit
planar vane
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.)
Expired - Lifetime
Application number
EP98954796A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1041351A4 (en
EP1041351A1 (en
Inventor
Masakazu Shiga-seisakusho of Daikin Inds. URAKAWA
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.)
Daikin Industries Ltd
Original Assignee
Daikin Industries Ltd
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 Daikin Industries Ltd filed Critical Daikin Industries Ltd
Publication of EP1041351A1 publication Critical patent/EP1041351A1/en
Publication of EP1041351A4 publication Critical patent/EP1041351A4/en
Application granted granted Critical
Publication of EP1041351B1 publication Critical patent/EP1041351B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • F24F1/0011—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
    • F24F1/0047—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
    • F24F1/0011—Indoor units, e.g. fan coil units characterised by air outlets
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
    • F24F1/0007—Indoor units, e.g. fan coil units
    • F24F1/0018—Indoor units, e.g. fan coil units characterised by fans
    • F24F1/0022—Centrifugal or radial fans
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
    • F24F1/0007—Indoor units, e.g. fan coil units
    • F24F1/0059—Indoor units, e.g. fan coil units characterised by heat exchangers
    • F24F1/0063—Indoor units, e.g. fan coil units characterised by heat exchangers by the mounting or arrangement of the heat exchangers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
    • F24F13/02—Ducting arrangements
    • F24F13/06—Outlets for directing or distributing air into rooms or spaces, e.g. ceiling air diffuser
    • 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
    • F24F13/08—Air-flow control members, e.g. louvres, grilles, flaps or guide plates

Definitions

  • the present invention relates to an indoor unit for an air conditioner, which employs a turbo fan for blowing out sucked air radially outwardly relative to an axis thereof.
  • an indoor unit for an air conditioner in which a cross-fin heat exchanger and a cross flow fan are disposed within a generally rectangular casing mounted on a wall surface, where air-conditioning air is blown out from an air outlet provided at the underside of the casing.
  • this indoor unit for an air conditioner is largely projected from the wall surface, incapable of being thinned in depth, thus having a drawback that the indoor unit does not fit indoor interior.
  • the present applicant manufactured an indoor unit for an air conditioner capable of improving the indoor interior properties by being thinned.
  • This indoor unit for an air conditioner includes a heat exchanger having an axis oriented along the back and forth direction within the casing, and a turbo fan which is placed on the back side of the heat exchanger within the casing and which serves for blowing out air, sucked from the front side, radially outwardly relative to the axis of the turbo fan. Then, air outlets for blowing out air in four directions, up and down, right and left, are provided in the casing . As the turbo fan is rotated, the indoor unit blows out air, sucked through an air inlet on the front side, in four directions from the individual air outlets.
  • the flow of air blown out from the turbo fan is controlled by a planar vane and a plurality of curved vanes mounted to the air outlets of the casing, whereas the air blown out from the turbo fan is blown out on the front side in the rotational direction of the turbo fan and about 40-degree outward with respect to a tangent to the outer circumference of the turbo fan.
  • air is not blown out in a direction along a plane generally perpendicular to the longitudinal direction of the air outlets of the casing, posing a problem that desired air flow characteristics cannot be obtained.
  • the incident angle of the air flow on the vane surfaces of the curved vanes on the rear side becomes larger so that separation flows of air would occur.
  • the curved surfaces of the curved vanes are uniformized in configuration so that the air is blown out in a direction along a plane generally perpendicular to the longitudinal direction of the air outlets on the rear side in the rotational direction of the turbo fan, the incident angle of the air flow on the vane surfaces of the curved vanes on the front side becomes larger so that separation flows of air would occur. This poses problems that the air flow is not efficiently regulated, and that noise occurs due to the separation flows. Also, if the spacings between adjacent curved vanes are uniformized so that the flow regulation is optimized on the front side in the rotational direction of the turbo fan, the flow regulation effect on the curved vanes on the rear side becomes smaller.
  • the JP-A-06257595 discloses an indoor unit where the fan itself comprises a planar vane and a plurality of curved vanes arrayed on the planar vane, so that the noise produce by the fan itself is reduced.
  • the DE-A-1013034 discloses a fan unit comprising a casing and a plurality of curved vanes, where the plurality of curved vanes have curvatures increasing and where spacing between adjacent curved vanes become smaller in a rotational direction of the fan.
  • An object of the present invention is therefore to provide an indoor unit for an air conditioner capable of efficiently regulating the blown-off air and reducing noise.
  • the present invention provides an indoor unit for an air conditioner in which a turbo fan disposed within a casing sucks air from a front side of the indoor unit and blows out the air radially outwardly relative to an axis of the turbo fan, comprising: a planar vane mounted to an air outlet provided in the casing; and a plurality of curved vanes arrayed on the planar vane in a longitude direction of the planar vane at the air outlet and curved so as to guide the air blown out from the turbo fan to an outward direction generally vertical to a longitudinal direction of the planar vane, where the plurality of curved vanes have curvatures increasing from a rear side of the planar vane relative to a rotational direction of the turbo fan toward a front side of the planar vane.
  • the air sucked from the front side of the indoor unit by the turbo fan is blown out outward in the rotational direction at an angle of about 40 degrees to a tangent to the outer circumference of the turbo fan.
  • the air flow is regulated along the planar vane and the plurality of curved vanes mounted to the air outlets of the casing.
  • the angle of the air flow to the longitudinal direction of the air outlets becomes larger on the rear side of the air outlets in the rotational direction of the turbo fan, while the angle of the air flow to the longitudinal direction of the air outlets becomes smaller on the front side of the air outlets in the rotational direction of the turbo fan.
  • the incident angle of the air flow on all the curved vanes is decreased so that the air flow regulated by the planar vane and the plurality of curved vanes is blown out in a desired direction (e.g., along the plane perpendicular to the longitudinal direction of the air outlets) without causing any separation of air flow to the curved vanes. Consequently, the blowoff air from the turbo fan can be efficiently regulated, and besides noise can be reduced.
  • a region where the plurality of curved vanes are arrayed is divided into a plurality of sub-regions, and the curvatures of the curved vanes are different among the plurality of sub-regions.
  • the design can be simplified as compared to when the configuration of the curved surfaces of all the curved vanes is designed optimally depending on variations in the angle of air flow to the longitudinal direction of the air outlets, and besides efficient flow regulation and noise reduction can be achieved with a simple construction, thus allowing a cost reduction.
  • spacings between adjacent curved vanes become smaller from the rear side of the planar vane relative to the rotational direction of the turbo fan toward the front side of the planar vane.
  • the indoor unit for an air conditioner of this embodiment by forming the plurality of curved vanes so that spacings between adjacent curved vanes become smaller from rear side toward front side in the rotational direction of the turbo fan, the flow regulation effect on the curved vanes on the rear side of the rotational direction of the turbo fan is decreased according to the variations in the angle of the air flow to the longitudinal direction of the air outlets, while the flow regulation effect on the curved vanes on the front side of the air outlets in the rotational direction of the turbo fan is increased.
  • the blowoff air from the turbo fan can be regulated further efficiently without unnecessarily increasing the flow regulation effect, and besides noise can be reduced.
  • a region where the plurality of curved vanes are arrayed is divided into a plurality of sub-regions, and the curvatures of the curved vanes are different among the plurality of sub-regions while the spacings between adjacent curved vanes are different among the plurality of sub-regions.
  • the design can be simplified as compared to when the configuration of the curved surfaces of all the curved vanes is designed optimally depending on variations in the angle of air flow to the longitudinal direction of the air outlets, and besides efficient flow regulation and noise reduction can be achieved with a simple construction, thus allowing a cost reduction.
  • the planar vane and the plurality of curved vanes are integrally formed.
  • the planar vane serves also as a support member for supporting the plurality of curved vanes.
  • the number of parts is decreased and therefore the air outlet structure can be simplified, thus allowing a cost reduction.
  • an incident angle of the air flow is generally equal along an entire upstream-side leading edge of each curved vane on the planar vane.
  • the incident angle of the air flow is generally equal along the entire upstream-side leading edge each curved vane on the planar vane.
  • the air flow is less subject to disturbance, so that noise can be further reduced.
  • the present invention also provides an indoor unit for an air conditioner in which a turbo fan disposed within a casing sucks air from a front side of the indoor unit and blows out the air radially outwardly relative to an axis of the turbo fan, comprising: a planar vane mounted to an air outlet provided in the casing; and a plurality of curved vanes arrayed on the planar vane in a longitude direction of the planar vane at the air outlet, where spacings between adjacent curved vanes become smaller from a rear side of the planar vane relative to a rotational direction of the turbo fan toward a front side of the planar vane.
  • the air sucked from the front side by the turbo fan is blown out outward in the rotational direction at an angle of for example about 40 degrees to a tangent to the outer circumference of the turbo fan.
  • the air flow is regulated along the planar vane and the plurality of curved vanes mounted to the air outlets of the casing.
  • the angle of the air flow to the longitudinal direction of the air outlets becomes larger on the rear side of the air outlets in the rotational direction of the turbo fan, while the angle of the air flow to the longitudinal direction of the air outlets becomes smaller on the front side of the air outlets in the rotational direction of the turbo fan.
  • the flow regulation effect on the curved vanes on the rear side of the rotational direction of the turbo fan is decreased, while the flow regulation effect on the curved vanes on the front side of the air outlets in the rotational direction of the turbo fan is increased.
  • the air flow is regulated securely on one side on which the curved vanes have smaller angles of air flow to the longitudinal direction of the air outlets without unnecessarily increasing the flow regulation effect on the rear side in the rotational direction of the turbo fan, so that the regulated air is blown out from the air outlets in a desired direction (e.g., along the plane perpendicular to the longitudinal direction of the air outlets).
  • a desired direction e.g., along the plane perpendicular to the longitudinal direction of the air outlets.
  • a region where the plurality of curved vanes are arrayed is divided into a plurality of sub-regions, and the spacings between adjacent curved vanes are different among the plurality of sub-regions.
  • the design can be simplified as compared to when all the spacings between adjacent curved vanes are designed optimally depending on variations in the angle of air flow to the longitudinal direction of the air outlets, and besides efficient flow regulation and noise reduction can be achieved with a simple construction, thus allowing a cost reduction.
  • the planar vane and the plurality of curved vanes are integrally formed.
  • the planar vane serves also as a support member for supporting the plurality of curved vanes.
  • the number of parts is decreased and therefore the air outlet structure can be simplified, thus allowing a cost reduction.
  • an incident angle of air blown out from the turbo fan is generally equal along an entire upstream-side leading edge of each curved vane on the planar vane.
  • the incident angle of air blown out from the turbo fan is generally equal along the entire upstream-side leading edge of each curved vane on the planar vane.
  • the air flow is less subject to disturbance, so that noise can be further reduced.
  • Fig. 1 is a front view of an indoor unit for an air conditioner according to an embodiment of the invention.
  • Reference numeral 1 denotes a generally square-shaped casing whose rear is mounted on an indoor wall surface
  • 2 denotes a turbo fan whose axis is placed at a generally center of the casing 1 and along the back-and-forth direction and which blows out air, sucked from the front side, radially outwardly relative to the axis of the turbo fan.
  • Air flow control members 11 are mounted to rectangular air outlets 21 - 24 provided at both side faces and upper-and-lower faces of the casing 1, respectively.
  • Fig. 1 shows a state in which the front panel and the heat exchanger have been removed.
  • Guide portions 31 - 34 for guiding the air blown out from the turbo fan 2 are also mounted to near four corner portions of the casing 1, respectively.
  • Fig. 2 shows an enlarged view of a cross section taken along the line II - II of Fig. 1.
  • a motor 3 is mounted at a generally center of the casing 1, and the turbo fan 2 is mounted to an output shaft 3a of the motor 3.
  • a partitioning plate 4 having a circular hole 4a at a generally center thereof is mounted on the front side of the turbo fan 2.
  • a heat exchanger 5 is mounted on the front side of the partitioning plate 4.
  • a front panel 6 having an air inlet 6a is mounted so as to cover the heat exchanger 5.
  • a front grille 7 is mounted to the air inlet 6a of the front panel 6.
  • Fig. 3 shows a perspective view of the air flow control member 11.
  • the air flow control member 11 includes a generally rectangular planar vane 12, and a plurality of curved vanes 13, 14, 15
  • the curved vanes 13, 14, 15 are provided upright on the planar vane 12 with spacings from one another and each have a curved surface whose generatrix is generally vertical to the planar vane 12.
  • Arms 16, 18 are provided upright at both ends of the planar vane 12.
  • a rotating shaft 17 is provided so as to extend outward and lengthwise of the planar vane 12.
  • a coupling portion 29 is provided outside and lengthwise of the planar vane 12.
  • ribs 25, 26 are provided on one side of the arm 16 closer to the planar vane 12.
  • Ribs 27, 28 are provided on one side of the arm 18 closer to the planar vane 12.
  • An output shaft of an unshown stepping motor is coupled to the coupling portion 29 so as to allow the air flow control member 11 to be rotated coaxially about the output shaft and the rotating shaft 17.
  • a region where the plurality of curved vanes 13, 14, 15 are arrayed is divided into regions A, B, C.
  • Four curved vanes 13 are arrayed at intervals of about 18.5 mm in the region A
  • four curved vanes 14 are arrayed at intervals of about 17 mm in the region B
  • eight curved vanes 15 are arrayed at intervals of about 15 mm in the region C.
  • the curved vanes 13, 14, 15 are so formed that their curvatures become larger in the order of regions A, B, C from rear side to front side in the rotational direction of the turbo fan 2 (a direction of arrow R1 in Fig.
  • a spacing between the region A and the region B, and a spacing between the region B and the region C may be set a spacing equal to that of one of the two regions, or to a mean value of the spacings of the two regions.
  • Fig. 4 shows an enlarged view of a vicinity of the air outlet 21 of Fig. 2.
  • a guide portion 1a is formed so as to gradually increase in thickness from near the turbo fan 2 toward the air outlet 21 so that the blowoff air from the turbo fan 2 is blown out obliquely forward.
  • a guide member 20 which gradually decreases in thickness from near the turbo fan 2 toward the air outlet 21. Then the air flow control member 11 is mounted to the air outlet 21 so as to be rotatable about the rotating shaft 17. In Fig. 4, the air flow control member 11 in its fully open state is shown.
  • the flow direction of air blown out from the lower air outlet 24 is angled at ⁇ 1 to the longitudinal direction of the air outlet 24 on the rear side in the rotational direction of the turbo fan 2, and at ⁇ 2 ( ⁇ ⁇ 1) to the longitudinal direction of the air outlet 24 on the front side in the rotational direction of the turbo fan 2.
  • the flow of air is regulated by the curved vanes 13, which are smaller in curvature and wider in spacing, the curved vanes 15, which are larger in curvature and narrower in spacing, the curved vanes 14, which are medium in curvature and spacing between the curved vanes 13 and 15, and the planar vane 12, so that the air is blown out along a plane generally vertical to the longitudinal direction of the air outlet 24.
  • air blown out from the other air outlets 21, 22, 23 is also blown out along a plane generally vertical to the longitudinal direction of each air outlet.
  • the incident angle of air flow on all the curved vanes 13, 14, 15 becomes small.
  • air is blown out from the air outlets 21 - 24 along the plane perpendicular to the longitudinal direction of the air outlets 21 - 24.
  • the blowoff air from the turbo fan can be regulated efficiently, and besides noise can be reduced.
  • the design can be simplified as compared to when all the configurations of the curved surfaces of the curved vanes are designed optimally depending on variations in the angle of air flow to the longitudinal direction of the air outlets 21 - 24, and besides efficient flow regulation and noise reduction can be achieved with a simple construction, thus allowing a cost reduction.
  • planar vane 12 and the curved vanes 13, 14, 15 so that the planar vane 12 serves also as a support member for supporting the curved vanes 13, 14, 15, the number of parts is decreased and therefore the air outlet structure can be simplified, thus allowing a cost reduction.
  • planar vane 12 of the air flow control member 11 is in the fully open state as shown in Fig. 4, an upstream-side leading edge 15a of the curved vanes 13, 14, 15 (only one curved vane 15 is shown in Fig. 4) is so arranged that the incident angle ( ⁇ 3 in Fig. 4) of the air flow holds generally equal in any region with respect to the flow direction of the blowoff air from the turbo fan 2. Therefore, the air flow is less subject to disturbance, so that noise can be further reduced.
  • the curved vanes 13, 14, 15 are so arranged that their curvatures become larger and their spacings between adjacent curved vanes become smaller from rear side toward front side in the rotational direction of the turbo fan 2.
  • the curvatures of the curved vanes 13, 14, 15 become larger and the spacings between adjacent curved vanes are generally equal from rear side toward front side in the rotational direction of the turbo fan 2, or that the configuration of the curved surfaces of the curved vanes 13, 14, 15 are identical and the spacings between adjacent curved vanes become smaller from rear side toward front side in the rotational direction of the turbo fan 2.
  • the curvature of the curved vanes may be continuously changed, or the spacing between the curved vanes may be continuously changed.
  • planar vane and the curved vanes are integrally formed.
  • the planar vane and the curved vanes may also be fabricated separately from each other and thereafter combined together.
  • the incident angle of the air flow is generally equal in any region of the leading edge on the upstream side of the curved vanes 13, 14, 15.
  • the incident angle may be set appropriately depending on the flow direction of the blowoff air from the turbo fan.
  • the indoor unit for an air conditioner according to the present invention is applicable to air conditioners in which conditioning air is blown out up and down, right and left.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Air-Conditioning Room Units, And Self-Contained Units In General (AREA)
  • Air-Flow Control Members (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Air Filters, Heat-Exchange Apparatuses, And Housings Of Air-Conditioning Units (AREA)
EP98954796A 1997-12-18 1998-11-24 Indoor unit for air conditioner Expired - Lifetime EP1041351B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP34904197 1997-12-18
JP9349041A JP3061026B2 (ja) 1997-12-18 1997-12-18 空気調和機の室内機
PCT/JP1998/005263 WO1999031443A1 (fr) 1997-12-18 1998-11-24 Section interieure pour conditionneur d'air

Publications (3)

Publication Number Publication Date
EP1041351A1 EP1041351A1 (en) 2000-10-04
EP1041351A4 EP1041351A4 (en) 2001-08-29
EP1041351B1 true EP1041351B1 (en) 2004-09-01

Family

ID=18401098

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98954796A Expired - Lifetime EP1041351B1 (en) 1997-12-18 1998-11-24 Indoor unit for air conditioner

Country Status (7)

Country Link
EP (1) EP1041351B1 (ja)
JP (1) JP3061026B2 (ja)
CN (1) CN1134622C (ja)
ES (1) ES2227888T3 (ja)
HK (1) HK1035225A1 (ja)
TW (1) TW387986B (ja)
WO (1) WO1999031443A1 (ja)

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JP3438684B2 (ja) * 1999-11-05 2003-08-18 ダイキン工業株式会社 天井埋込型空気調和装置
JP3624836B2 (ja) * 2001-01-15 2005-03-02 ダイキン工業株式会社 空気調和機の室内機
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KR102342120B1 (ko) * 2014-09-30 2021-12-22 엘지전자 주식회사 공기조화기
CN104456724A (zh) * 2014-10-29 2015-03-25 珠海格力电器股份有限公司 空调器
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JPH11182921A (ja) 1999-07-06
ES2227888T3 (es) 2005-04-01
CN1134622C (zh) 2004-01-14
EP1041351A4 (en) 2001-08-29
HK1035225A1 (en) 2001-11-16
WO1999031443A1 (fr) 1999-06-24
CN1285030A (zh) 2001-02-21
EP1041351A1 (en) 2000-10-04
JP3061026B2 (ja) 2000-07-10
TW387986B (en) 2000-04-21

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