EP3093499B1 - Fan, centrifugal fan, and air conditioning device - Google Patents

Fan, centrifugal fan, and air conditioning device Download PDF

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Publication number
EP3093499B1
EP3093499B1 EP14877753.5A EP14877753A EP3093499B1 EP 3093499 B1 EP3093499 B1 EP 3093499B1 EP 14877753 A EP14877753 A EP 14877753A EP 3093499 B1 EP3093499 B1 EP 3093499B1
Authority
EP
European Patent Office
Prior art keywords
section
supporting member
vanes
vane
shroud
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.)
Active
Application number
EP14877753.5A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP3093499A1 (en
EP3093499A4 (en
Inventor
Atsushi Kono
Takashi Ikeda
Masahiko Takagi
Makoto Kurihara
Kohei Tsunetomo
Takehiro Hayashi
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.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric 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 Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Publication of EP3093499A1 publication Critical patent/EP3093499A1/en
Publication of EP3093499A4 publication Critical patent/EP3093499A4/en
Application granted granted Critical
Publication of EP3093499B1 publication Critical patent/EP3093499B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/26—Rotors specially for elastic fluids
    • F04D29/28—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps
    • F04D29/281—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps for fans or blowers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/02—Selection of particular materials
    • F04D29/023—Selection of particular materials especially adapted for elastic fluid pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
    • F24F1/0007—Indoor units, e.g. fan coil units
    • F24F1/0018—Indoor units, e.g. fan coil units characterised by fans
    • F24F1/0022—Centrifugal or radial fans
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
    • F24F1/0007—Indoor units, e.g. fan coil units
    • F24F1/0043—Indoor units, e.g. fan coil units characterised by mounting arrangements
    • F24F1/0047—Indoor units, e.g. fan coil units characterised by mounting arrangements mounted in the ceiling or at the ceiling
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2230/00—Manufacture
    • F05D2230/20—Manufacture essentially without removing material
    • F05D2230/23—Manufacture essentially without removing material by permanently joining parts together
    • F05D2230/232—Manufacture essentially without removing material by permanently joining parts together by welding
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2300/00—Materials; Properties thereof
    • F05D2300/50—Intrinsic material properties or characteristics
    • F05D2300/52—Translucence

Definitions

  • the present invention relates to a fan and to an air-conditioning device provided with the fan.
  • PTL 1 discloses a centrifugal fan provided in an air-conditioning device of a ceiling-embedded type.
  • This centrifugal fan is provided with a main plate, a side plate and a plurality of vanes.
  • the main plate is separated from the side plate in the direction of the rotational axis of the fan, and the plurality of vanes are provided between the main plate and the side plate.
  • JP2009-257132-A proposes a turbo fan comprising a main plate to which a rotary shaft is secured.
  • each of the plurality of vanes the end surface on one side is connected to the main plate, and the end surface on the other side is connected to the side plate, and it is desirable for each of the plurality of vanes to maintain a satisfactory state of connection with the main plate or the side plate.
  • the present invention was devised in view of the foregoing, an object thereof being to provide a fan and an air-conditioning device wherein the state of connection between a plurality of vanes and vane supporting members can be confirmed easily.
  • the fan according to the present invention is defined in the independent claim 1.
  • the dependent claims define preferred embodiments of the invention.
  • the fan according to the present invention is a fan, comprising a first supporting member, a second supporting member and a plurality of vanes; wherein the first supporting member and the second supporting member are separated in the direction of a rotational axis of the fan; the plurality of vanes are provided between the first supporting member and the second supporting member; the plurality of vanes are welded to at least one of the first supporting member and the second supporting member; the at least one of the first supporting member and the second supporting member is a member having a visible light transmissivity of no less than 30 percent; and only the negative pressure surface sides of both ends of each of the vanes are welded to the first supported member and the second supporting member.
  • the vanes may be members having a visible light transmissivity of less than 30 percent.
  • the present invention may be a centrifugal fan which is the fan described above, wherein the first supporting member is a shroud and the second supporting member is a main plate; a plurality of receiving sections are formed in the shroud; the receiving sections each project in a direction away from the main plate, and have a recess on the inner side of the receiving section; and one end of each of the vanes is fitted into the recess of the corresponding receiving section of the shroud, and the negative pressure surface side of the one end is welded to a bottom surface of the corresponding recess.
  • the receiving sections may have a first step section, a second step section and an inclined surface section; the recess depth of the first step section may be greater than the recess depth of the second step section; and the inclined surface section may be situated between the first step section and the second step section and may extend obliquely with respect to the direction in which the first step section and the second step section extend.
  • a first round section may be formed on the one end side of the vane, on the positive pressure surface of the vane; a second round section may be formed on the one end side of the vane, on the negative pressure surface of the vane; and as one aspect of the invention, when taking the radius of curvature of the first round section to be R1 and taking the radius of curvature of the second round section to be R2, then R1 > R2.
  • a third round section may be formed on a front edge side of the positive pressure surface of the vane; a fourth round section may be formed on a front edge side of the negative pressure surface of the vane; and as one aspect of the invention, when taking the radius of curvature of the third round section to be R3 and taking the radius of curvature of the fourth round section to be R4, then R3 > R4.
  • An air-conditioning device which achieves the object includes a heat exchanger and a fan, the fan being the fan or centrifugal fan of the present invention described above.
  • the state of connection between a plurality of vanes and vane supporting members can be confirmed easily.
  • Fig. 1 is a schematic drawing showing the internal structure of an air-conditioning device relating to a first embodiment of the present invention. More specifically, the air-conditioning device according to the first embodiment is an indoor unit of a so-called package air-conditioner, and Fig. 1 illustrates a state where the major part of the air-conditioning device is embedded in the ceiling of a room, and the lower portion of a main body faces into the room.
  • An air-conditioning device 100 is provided with a case 1 which is embedded in the ceiling 15a of the space (room 15) that is the object of air conditioning.
  • the case 1 is formed, for example, in substantially a cuboid shape.
  • the case 1 includes an upper surface part 1a, a side surface part 1b and a decorative panel 2, which is a lower surface part.
  • the side surface part 1b is formed in a cylindrical shape extending vertically, when observed in plan view, and the upper portion of the side surface part 1b is enclosed by the upper surface part 1a, and the decorative panel 2 is provided below the side surface part 1b.
  • the case 1 is formed in substantially a box shape by the upper surface part 1a, the side surface part 1b and the decorative panel 2.
  • An inlet port 2a is provided in the center of the decorative panel 2, and four outlet ports 2b are provided about the periphery of the inlet port 2a in the decorative panel 2 so as to correspond to the four surfaces of the side surface part 1b.
  • a centrifugal fan 3, a fan motor 4, a bell mouth 5 and a heat exchanger 6 are accommodated inside the case 1.
  • the centrifugal fan 3 creates a flow of air which is sucked inside the case 1 from the inlet port 2a and is discharged into the object space from the outlet ports 2b.
  • the heat exchanger 6 is arranged in this flow path of the air, and adjusts the temperature of the air.
  • Fig. 3 is a diagram showing a peripheral portion of one vane as viewed from the direction of the arrow III in Fig. 2 .
  • Fig. 4 is a diagram showing a peripheral portion of one vane as viewed from the direction of the arrow IV in Fig. 2 .
  • Fig. 5 is a cross-sectional diagram along line V-V in Fig. 3 .
  • Fig. 5 illustrates a very small portion of the thickness, and therefore the hatching is omitted.
  • Fig. 6 is a perspective diagram showing the peripheral portion of one vane.
  • Fig. 3 is a diagram showing a peripheral portion of one vane as viewed from the direction of the arrow III in Fig. 2 .
  • Fig. 4 is a diagram showing a peripheral portion of one vane as viewed from the direction of the arrow IV in Fig. 2 .
  • Fig. 5 is a cross-sectional diagram along line V-V in Fig. 3 .
  • Fig. 5 illustrates
  • FIG. 7 is a diagram showing a connecting portion between a shroud and a vane, in the direction of the cross-section in Fig. 5 .
  • Fig. 8 is a diagram showing a schematic view of the shape relationship of a weld portion between the shroud and the vane, as viewed in the direction of the arrow VIII in Fig. 7.
  • Fig. 8 is essentially a diagram for the purpose of showing the relationship between the shapes of the shroud and the vanes, and therefore priority has been given to making the diagram easy to read and the gap between the shroud and the vane (the presence of a gap and the size of the gap), and the thickness of the shroud material, and the shape of the connecting oblique surface portion of the shroud, etc. do not illustrate an actual mode.
  • the centrifugal fan 3 is provided with a shroud 51, which is a first supporting member, a main plate 53 which is a second supporting member, and a plurality of vanes 55.
  • the shroud 51 and the main plate 53 are separated in the X direction of the rotational axis of the centrifugal fan 3.
  • the plurality of vanes 55 are provided between the shroud 51 and the main plate 53.
  • a corresponding plurality of vanes 55 are welded respectively to the shroud 51 and the main plate 53.
  • the vanes 55 are welded to the corresponding shroud 51 or main plate 53, by laser welding.
  • the present invention is not limited to laser welding, and can also use ultrasonic welding, for example.
  • the vanes 55 each have at least one internal hollow section, and are made by integral molding or by combining a plurality of parts.
  • a front edge 55a is positioned further on an inner side than a rear edge 55b in the radial direction.
  • the main plate 53 has a round disk shape.
  • the shroud 51 has a circular ring shape in plan view. As shown by the longitudinal cross-sections in Fig. 1 and Fig. 5 , the shroud 51 has a curved surface which is recessed radially outwards and towards the upstream side of the flow of air which is sucked into the centrifugal fan 3.
  • one end of the vane 55 in the direction of the rotational axis is welded to the shroud 51. More specifically, as shown in Fig. 6 , a plurality of receiving sections 61 of the same number as the plurality of vanes 55 are formed on the curved surface of the shroud 51.
  • the receiving section 61 projects in a direction away from the main plate 53, and has substantially the same thickness. Consequently, on the main plate 53 side (the vane 55 side), the receiving section 61 has a recess of a shape that substantially corresponds to a shape projecting in a direction away from the main plate 53. One end of a corresponding vane 55 is fitted into this recess.
  • the receiving section 61 projects in a two-step fashion and includes a first step section 61a and a second step section 61b.
  • the first step section 61a is situated on the side of the front edge 55a of the vane 55 and the second step section 61b is situated on the side of the rear edge 55b of the vane 55.
  • the recess depth on the inner side (main plate side) of the first step section 61a is greater than the recess depth on the inner side (main plate side) of the second step section 61b.
  • the first step section 61a and the second step section 61b are flat surfaces which extend substantially in parallel with the main plate 53 (flat surfaces which are perpendicular to the rotational axis X of the centrifugal fan 3).
  • the receiving sections 61 each have a connecting inclined surface section 61c between the first step section 61a and the second step section 61b.
  • the connecting inclined surface section 61c connects the first step section 61a and the second step section 61b which have different projection heights, and extends in an inclined fashion with respect to the direction in which the first step section 61a and the second step section 61b extend.
  • the receiving section 61 has substantially the same material thickness, and therefore a recess of corresponding shape to the outside which appears in Fig. 2 or Fig. 6 is formed on the inner side of the receiving section 61 (on the main plate 53 side or the vane 55 side).
  • one end of the vane 55 (the end on the side of the shroud 51) has a first end surface 71 and a second end surface 73, so as to correspond to the first step section 61a and the second step section 61b of the receiving section 61.
  • the first end surface 71 is situated on the side of the front edge 55a of the vane 55 and the second end surface 73 is situated on the side of the rear edge 55b of the vane 55.
  • the first end surface 71 is further separated from the main plate 53 than the second end surface 73.
  • the first end surface 71 and the second end surface 73 are flat surfaces which extend substantially in parallel with the main plate 53 (flat surfaces which are perpendicular to the rotational axis X of the centrifugal fan 3).
  • each vane 55 has a rising portion 75 between the first end surface 71 and the second end surface 73.
  • the rising portion 75 extends substantially along the direction of the rotational axis X of the centrifugal fan 3, and connects the first end surface 71 and the second end surface 73.
  • the vanes 55 and the shroud 51 configured in this way are welded together, between the first end surface 71 of the vane 55 and the inner side of the first step section 61a of the shroud 51 (the bottom surface seen from the recess), and between the second end surface 73 of the vane 55 and the inner side of the second step section 61b of the shroud 51 (the bottom surface seen from the recess). More specifically, as shown in Fig.
  • Fig. 9 is an enlarged diagram of portion Y in Fig. 7 and Fig. 10 is an enlarged diagram of portion Z in Fig. 3 .
  • a first round section 85 is formed on the first end surface 71 side and the second end surface 73 side of the positive pressure surface 81 of the vane 55.
  • a second round section 87 is also formed on the first end surface 71 side and the second end surface 73 side of the vane 55.
  • a third round section 91 is formed on the side of the front edge 55a of the positive pressure surface 81 of the vane 55.
  • a fourth round section 93 is formed on the front edge 55a side of the negative pressure surface 83 of the vane 55.
  • the round sections 85, 93 which have a larger radius of curvature than the negative pressure surface 83 side of the vane 55, it is possible to provide a configuration having little air resistance.
  • the other end of the vane 55 in the direction of the rotational axis is welded to the main plate 53. More specifically, a plurality of recesses of the same number as the plurality of vanes 55 are formed in the inner-side surface of the main plate 53 (the surface on the side of the shroud 51), and the other ends of the vanes 55 are fitted into and welded to these recesses.
  • the recesses on the inner-side surface of the main plate 53 are only slightly recessed.
  • the bottom surface of the recess on the inner-side surface of the main plate 53, and the other end of the vane 55 are both flat surfaces which extend substantially in parallel with the main plate 53 (flat surfaces perpendicular to the rotational axis X of the centrifugal fan 3).
  • the vanes 55 and the main plate 53 are welded only by welding the negative pressure surface 83 side of the other end of the vane 55 (the surface of the vane 55 nearer to the rotational axis X of the centrifugal fan 3) to the bottom of the recess on the inner-side surface of the main plate 53.
  • the shroud 51 and the main plate 53 are both made from a member having a visible light transmissivity of no less than 30 percent (for example, resin having a visible light transmissivity of no less than 30 percent).
  • at least one of the first supporting member and the second supporting member should be made from a member having a visible light transmissivity of no less than 30 percent, and it is not necessary for both the first supporting member and the second supporting member to be made from a member having a visible light transmissivity of no less than 30 percent.
  • the vanes 55 are made from a member having a lower visible light transmissivity than either of the shroud 51 and the main plate 53, or from a member having a visible light transmissivity lower than 30 percent.
  • at least one of the first supporting member and the second supporting member is made from a member having a laser light transmissivity of no less than 50 percent.
  • the vane supporting members are members having a visible light transmissivity of no less than 30 percent, then it is possible to determine the suitability or non-suitability of the welded state of the vanes (the presence or absence of connection defects, etc.), after the plurality of vanes have been welded to the vane supporting members, easily and reliably, by external inspection.
  • the vanes are respectively welded to the vane supporting members on the negative pressure surface side of the end portions of the vanes, and therefore even if a centrifugal force due to the rotation of the fan acts on the vanes, since there are no gaps in the connecting portion between the vane supporting members and the vanes on the negative pressure surface side, then it is possible to prevent noise caused by the passage of an air flow through the gap.
  • the respective ends of the vanes are fitted into a recess of a corresponding receiving section on the shroud, and therefore in relation to twisting in the direction of rotation, in addition to support by the weld surface, support is also provided by the recess surface on the front pressure surface side and the recess surface on the rear pressure surface side, and therefore high-strength vane support is achieved. Furthermore, it is possible to improve the bond of the contact surface between the vane supporting members and the vanes, and thus to reduce welding defects, by configuring the weld surface to face in a plane that is perpendicular to the direction of the rotational axis of the centrifugal fan.
  • the weld surface between the shroud and the vane is configured by two surfaces having different distances from the main plate, and therefore it is possible to reduce the height of the receiving section in the direction of the rotational axis, and noise due to separation of the air flow caused by the projection shape.
  • the receiving sections in the shroud have a first step section and a second step section which project in a two-step fashion, and have a connecting inclined surface section which extends obliquely with respect to the direction in which the first step section and the second step section extend, then there is no sudden step difference in the receiving section which projects, and therefore it is possible to reduce the noise due to separation of the air flow generated by the step difference.
  • Fig. 11 is a perspective diagram of a cross-flow fan according to a second embodiment.
  • the cross-flow fan 203 is provided with a plurality of vane supporting members 253 arranged separately in the direction of the rotational axis X of the fan, and a corresponding plurality of vanes 255 which are welded between the corresponding two vane supporting members. At least one (and possibly all) of the plurality of vane supporting members 253 is a member having a visible light transmissivity of no less than 30 percent. Furthermore, one or more of the vanes 255 which are welded to vane supporting members 253, which are members having a visible light transmissivity of no less than 30 percent, is made from a member having a lower visible light transmissivity than the vane supporting members 253, or is made from a member having a visible light transmissivity of less than 30 percent.
  • the present invention can also be applied widely to various devices and equipment in which a fan is installed.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Air-Conditioning Room Units, And Self-Contained Units In General (AREA)
EP14877753.5A 2014-01-10 2014-01-10 Fan, centrifugal fan, and air conditioning device Active EP3093499B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2014/050336 WO2015104837A1 (ja) 2014-01-10 2014-01-10 ファン、遠心ファン及び空気調和装置

Publications (3)

Publication Number Publication Date
EP3093499A1 EP3093499A1 (en) 2016-11-16
EP3093499A4 EP3093499A4 (en) 2017-11-15
EP3093499B1 true EP3093499B1 (en) 2020-06-03

Family

ID=53523685

Family Applications (1)

Application Number Title Priority Date Filing Date
EP14877753.5A Active EP3093499B1 (en) 2014-01-10 2014-01-10 Fan, centrifugal fan, and air conditioning device

Country Status (3)

Country Link
EP (1) EP3093499B1 (ja)
JP (1) JP6203293B2 (ja)
WO (1) WO2015104837A1 (ja)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20220033358A (ko) * 2020-09-09 2022-03-16 삼성전자주식회사 팬, 팬을 갖는 공기조화기 및 팬의 제조방법
GB202406620D0 (en) * 2022-01-17 2024-06-26 Mitsubishi Electric Corp Impeller, centrifugal blower, and indoor unit

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4042664B2 (ja) * 2003-09-17 2008-02-06 株式会社ジェイテクト 樹脂材のレーザ溶着方法
JP4432474B2 (ja) * 2003-11-27 2010-03-17 ダイキン工業株式会社 遠心送風機の羽根車及びそれを備えた遠心送風機
WO2007040236A1 (ja) * 2005-10-06 2007-04-12 Mitsubishi Electric Corporation ターボファン、空気調和機
JP5077035B2 (ja) * 2008-04-14 2012-11-21 株式会社富士通ゼネラル ターボファン

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
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Also Published As

Publication number Publication date
JP6203293B2 (ja) 2017-09-27
WO2015104837A1 (ja) 2015-07-16
JPWO2015104837A1 (ja) 2017-03-23
EP3093499A1 (en) 2016-11-16
EP3093499A4 (en) 2017-11-15

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