EP1411247A1 - Impulseur pour soufflante multiaubes et soufflante multiaubes dote dudit impulseur - Google Patents

Impulseur pour soufflante multiaubes et soufflante multiaubes dote dudit impulseur Download PDF

Info

Publication number
EP1411247A1
EP1411247A1 EP02733494A EP02733494A EP1411247A1 EP 1411247 A1 EP1411247 A1 EP 1411247A1 EP 02733494 A EP02733494 A EP 02733494A EP 02733494 A EP02733494 A EP 02733494A EP 1411247 A1 EP1411247 A1 EP 1411247A1
Authority
EP
European Patent Office
Prior art keywords
blades
impeller
main plate
blade
portions
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP02733494A
Other languages
German (de)
English (en)
Other versions
EP1411247A4 (fr
EP1411247B1 (fr
Inventor
Masahito c/o DAIKIN INDUSTRIES LTD. HIGASHIDA
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
Priority claimed from JP2001196180A external-priority patent/JP4774637B2/ja
Priority claimed from JP2001196179A external-priority patent/JP4736253B2/ja
Priority claimed from JP2001220008A external-priority patent/JP4945859B2/ja
Application filed by Daikin Industries Ltd filed Critical Daikin Industries Ltd
Publication of EP1411247A1 publication Critical patent/EP1411247A1/fr
Publication of EP1411247A4 publication Critical patent/EP1411247A4/fr
Application granted granted Critical
Publication of EP1411247B1 publication Critical patent/EP1411247B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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
    • F04D29/282—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps for fans or blowers the leading edge of each vane being substantially parallel to the rotation axis
    • F04D29/283—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps for fans or blowers the leading edge of each vane being substantially parallel to the rotation axis rotors of the squirrel-cage type
    • 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
    • F04D29/30—Vanes
    • 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
    • F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
    • F04D29/661—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps
    • F04D29/667—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps by influencing the flow pattern, e.g. suppression of turbulence

Definitions

  • the present invention relates to an impeller for a multi-blade fan and a multi-blade fan equipped with the same. More particularly, the present invention relates to an impeller for a multi-blade fan in which the ends of a plurality of blades that extend from a main plate are connected by means of an annular side plate, and to a multi-blade fan equipped with the same.
  • a multi-blade fan is employed in devices such as air purifiers, air conditioners, and the like (hereinafter referred to as "air conditioners") in order to blow air.
  • a conventional multi-blade fan is shown in Figs. 1-3.
  • Fig. 1 shows lateral cross-sectional views of a conventional multi-blade fan
  • Fig. 2 shows a perspective view of an impeller for the conventional multi-blade fan
  • Fig. 3 shows a plan view of the impeller for the conventional multi-blade fan.
  • the multi-blade fan 10 includes an impeller 13, a casing 11 that covers the impeller 13, and a motor 14 that rotates the impeller 13.
  • the impeller 13 includes a disk-shaped main plate 31 to which one end of each of a plurality of blades 33 are fixed to the outer peripheral edge thereof, and an annular side plate 32 to which the other ends of the blades 33 are connected.
  • An air discharge port 11a, and an air intake port 11b that is surrounded by a bell mouth 12, are formed in a casing 11.
  • the intake port 11b faces the side plate 32 of the impeller 13.
  • the discharge port 11 a is formed in a direction that is perpendicular to the intake port 11b so that air is blown out in a direction approximately perpendicular to a rotational axis O-O of the impeller 13.
  • the impeller 13 rotates in a rotational direction R (shown in Fig. 3) with respect to the casing 11. This allows each blade 33 of the impeller to scoop out air from the inner peripheral side of the impeller 13 to a space on the outer peripheral side thereof, draw in air from the intake port 11b into the inner peripheral space of the impeller 13, and blow the air that was pushed out to the outer peripheral side of the impeller 13 through the discharge port 11a.
  • the multi-blade fan 10 draws in air from the intake port 11b and blows air out from the discharge port 11a.
  • Noise is produced in this type of multi-blade fan 10 that is caused by turbulent vortices produced near the main plate 31. More specifically, the turbulent vortices are generated by the mechanism described below.
  • air drawn into the interior of the impeller 13 from the intake port 11b mainly flows toward the main plate 31 and then gradually toward the outer periphery (see air flow W).
  • air flow W mainly flows toward the main plate 31 and then gradually toward the outer periphery.
  • a portion of the air drawn in from the intake port 11b collides with the main plate 31, and then flows toward the outer peripheral side near the main plate 31 (see air flow X). Turbulent vortices are generated in this air flow X due to the collision with the main plate 31.
  • the turbulent vortices flow with the air flow X toward the outer periphery and further merge with the air flow that collides with the main plate 31, and thus the turbulent vortices in the air flow X then gradually grow and the biggest turbulent vortices are formed on the inner peripheral edges of the blades 33. These enlarged turbulent vortices are scooped out toward the outer periphery by the blades 33, and this generates noise.
  • the cross-sectional shapes of the blades in the aforementioned fan are designed to be approximately the same in each position so that the blades can be unitarily formed from a synthetic resin by means of a two-piece horizontal mold.
  • the blades are not slanted or curved so that they can be formed with only upper and lower molds (see blades 33 in Figs. 2 and 3).
  • this type of blade shape creates a state in which the amount of air that flows in and out of will be different at each blade position, and this causes noise to be generated.
  • An object of the present invention is to provide an impeller that is capable of reducing the noise caused by turbulent vortices produced near the main plate of the impeller, and to provide a low noise multi-blade fan.
  • the impeller of a multi-blade fan disclosed in claim 1 includes a main plate that rotates about a rotational axis, a plurality of blades that are annularly disposed about the rotational axis with one end of the plurality of blades fixed to the main plate, and an annular side plate that connects with the other end of the plurality of blades. Then, inter-blade portions positioned between the plurality of blades of the main plate are cut out on at least the front sides of the blades in the rotational direction.
  • the impeller for a multi-blade fan disclosed in claim 2 is the impeller of claim 1, in which the side plate has an inner diameter that is larger than the outer diameter of the main plate. Then, inter-blade portions positioned between the plurality of blades of the main plate are cut out larger than the outer dimensions of the blades.
  • the blades of one impeller can be inserted into the inter-blade portions of another impeller and at least two impellers can thereby be stacked together.
  • side plates having an inner diameter that is larger than the outer diameter of the main plates will not be damaged, and two impellers can be stacked together if the blades of one impeller can be passed through the cut-outs of the inter-blade portions of the main plate on another impeller. Then, two impellers can be stacked together because cut-outs that are larger than the outer dimensions of the blades are formed in the inter-blade portions.
  • the entire inter-blade portion of the main plate may be cut out, rather than just a portion thereof, in order to maximize space efficiency.
  • the impeller for a multi-blade fan disclosed in claim 3 is the impeller of claims 1 or 2, in which the inter-blade portions are partially cut out in the circumferential direction.
  • the inter-blade portions are at least partially cut out from the main plate in the circumferential direction and from the front of the blades in the rotational direction, and are not cut out up to the rear side of the inter-blade portions in the rotational direction.
  • the multi-blade fan impeller disclosed in claim 4 is the impeller of any of claims 1 to 3, in which the inter-blade portions are cut out from the outer peripheral edges of the blades to the inner peripheral edges thereof.
  • the turbulent vortices easily escape from the cut out inter-blade portions before they reach the outer peripheral edges of the blades because the inter-blade portions are cut out from the outer peripheral edges of the blades to the inner peripheral edges thereof. In this way, the turbulent vortices that arrive at the outer peripheral edges of the blades can be further diminished, and noise can be further reduced.
  • the multi-blade fan impeller disclosed in claim 5 is the impeller in any of claims 1 to 4, in which the plurality of blades include slanted portions that each slant forward in the rotational direction. With the inter-blade portions, at least the projecting portions of the slanted portions of each blade are cut out therefrom.
  • slanted portions are provided on the plurality of blades, differences in the volume of air that flows into and out from the impeller at each position of the blades can be controlled to a low level, and both improvement in fan efficiency and a reduction in noise can be easily provided.
  • providing a slanted portion on each blade and cutting out the main plate will eliminate interference (the main plate) from the projecting portions of the slanted portions. Because of this, the plurality of blades included on the main plate can be unitarily formed from a synthetic resin material by means of a pair of molds.
  • blades that include slanted portions that could not be unitarily formed in the prior art can now be formed by means of a mold that is inserted from the cut-out portions (inter-blade portions) of the main plate and which forms the inner surfaces of the slanted portions, and a mold that forms the outer surfaces of the slanted portions from the opposite sides.
  • this impeller can both reduce noise and be unitarily formed from a synthetic resin.
  • the multi-blade fan impeller disclosed in claim 6 is the impeller of claim 5, in which the entire portion of each of the plurality of blades are slanted.
  • the multi-blade fan disclosed in claim 7 includes the impeller set forth in any of claims 1 to 6, a drive means that rotates the main plate, and a casing that covers the impeller and which includes an intake port that faces an opening in an inner peripheral side of the side plate and a discharge port that is provided on an outer peripheral side of the impeller and which blows air in a direction approximately perpendicular to the rotational axis.
  • each blade of the impeller scoops out air from the inner peripheral side of the impeller to a space on the outer peripheral side thereof, draws in air from the intake port into the inner peripheral space of the impeller, and blows the air that was pushed out to the outer peripheral side of the impeller through the discharge port.
  • the multi-blade fan draws in air from the intake port and blows out air from the discharge port.
  • a multi-blade fan (centrifugal fan) according to an embodiment of the present invention differs from the conventional multi-blade fan 10 shown in Figs. 1 to 3 in that the impeller 13 includes jagged shaped wave form members on the main plate 31 near the inner peripheral edges of the plurality of blades, jagged shaped wave form members on the main plate 31 side of the side plate 32, and a plurality of inter-blade cut-out portions 35 that have been cut out from the main plate 31 on the front side in the rotational direction of the blades 33.
  • Fig. 4 shows a lateral cross-sectional view of a multi-blade fan 40 of the present embodiment
  • Figs. 5 and 6 show a lateral cross-sectional view and a plan view of an impeller 43 of the multi-blade fan 40.
  • the multi-blade fan 40 is primarily composed of an impeller 63, a casing 11 that covers the impeller 63, and a motor 14 that rotates the impeller 43.
  • the impeller 43 includes a disk-shaped main plate 61 to which a plurality of blades 33 are fixed to the outer peripheral edge thereof, and an annular side plate 62 to which the other ends of the plurality of blades 33 are connected. A detailed description of the impeller 43 will be provided below.
  • the intake port 11b faces the side plate 62 of the impeller 43. Air that flows through the intake port 11b and into the space in the interior of the impeller 43 generally flows along the rotational axis O-O of the impeller 43 when it enters this space, and then flows in a direction away from the rotational axis O-O (toward the outer periphery of the impeller 43) due to the rotation of the impeller 43.
  • the discharge port 11a is formed such that it is perpendicular to the intake port 11b, so that air is blown out in a direction approximately perpendicular to the rotational axis O-O of the impeller 43.
  • a rotation shaft of the motor 14 is mounted in a central hole 61 a in the main plate 61 (see Fig. 6), and rotates the impeller 43 by rotating the main plate 61.
  • the main portion of the motor 14 is fixed to the casing 11.
  • the impeller 43 will now be described.
  • the impeller 43 includes the main plate 61, the plurality of blades 33, and the annular side plate 62.
  • the impeller 43 is a product made of a synthetic resin in which a mold is used to unitarily form the main plate 61, the plurality of blades 33, and the side plate 62 together.
  • the main plate 61 is a disk-shaped member in which the central hole 61a is formed, and the rotation shaft of the motor 14 is fixed in the central hole 61a.
  • the plurality of blades 33 are formed around the outer peripheral edge of the main plate 61 and are equidistant with respect to each other in the rotational direction.
  • Jagged shaped wave form members 64 are formed around a circumference of the main plate 61 near the inner peripheral edges of the plurality of blades 33.
  • the wave form members 64 include triangular wave forms that have a wave pitch P of 3 mm and a wave height H of 2 mm (see Fig. 7(a)).
  • the wave form members are not limited to triangular wave forms, and as shown in Figs. 7(b) and 7(c), may have wave forms shaped like sine waves or rectangles.
  • the dimensions of the wave form members are not limited to those of the present embodiment, and the wave pitch P may be in a range between 2 mm and 8 mm, and the wave height H may be in a range between 1 mm and 5 mm.
  • inter-blade portions 65 located between the plurality of blades 33 are cut out from the main plate 61 on the front sides in the rotational direction of the plurality of blades 33.
  • the plurality of inter-blade portions 65 are larger in the circumferential direction than the thickness in the circumferential direction of the blades 33, and are cut out on the front side in the rotational direction of the blade 33 with a length that does not reach the rear side in the rotational direction of the adjacent other blades 33.
  • the inter-blade portions 65 are cut out in the radial direction along the shape of the blades 33 at a length that extends from the outer peripheral edge of the blades 33 to the inner peripheral edge of the blades 33.
  • the blades 33 include a recessed surface on the front sides thereof in the rotational direction, and these members are annularly disposed with the rotational axis O-O at the center thereof.
  • One end of the blades 33 are fixed to the outer peripheral edge of the main plate 61, and extend lengthwise from this point along the rotational axis O-O without twisting. Then, as shown in Figs. 5 and 6, the other end of the blades 33 are connected to the annular side plate 62.
  • the annular side plate 62 is disposed on the outer peripheral side of the other ends of the blades 33, and is connected to each blade 33.
  • the side plate 62 is unitarily formed together with the main plate 61 and the plurality of blades 33.
  • the jagged shaped wave form members 66 are formed on the main plate 61 side of the side plate 62.
  • the wave form members 66 includes triangular wave forms that have a wave pitch P of 3 mm and a wave height H of 2 mm (see Fig. 7(a)).
  • the wave form members are not limited to triangular wave forms, and as shown in Figs. 7(b) and 7(c), may have wave forms shaped like sine waves or rectangles.
  • the dimensions of the wave form members are not limited to those of the present embodiment, and the wave pitch P may be in a range between 2 mm and 8 mm, and the wave height H may be in a range between 1 mm and 5 mm.
  • the impeller 43 rotates in a rotational direction R (shown in Fig. 6) with respect to the casing 11.
  • air will be scooped out primarily by the recessed surface on the front side in the rotational direction of the blades 33 of the multi-blade fan 40.
  • This allows the blades 33 of the impeller 43 to scoop out air from the inner peripheral side of the impeller 43 to a space on the outer peripheral side thereof, draw in air from the intake port 11b into the inner peripheral space of the impeller 43, and accumulate and blow the air that was scooped out to the outer peripheral side of the impeller 43 and out the discharge port 11a (see air flow Z in Fig. 4).
  • the multi-blade fan 40 draws in air from the intake port 11b along the rotational axis O-O, and the air is then blown out from the discharge port 11a in a direction that is perpendicular to the rotational axis O-O. Note that although only the air flow Z on the right side of the rotational shaft O-O is shown in Fig. 4, the air scooped out to the outer peripheral side of the impeller 13 on the left side of the rotational axis O-O will flow along the casing 11 to the discharge port 11a and then be blown out.
  • the inter-blade portions 65 on the main plate 61 of the impeller 43 of the present embodiment are larger in the circumferential direction that the thickness in the circumferential direction of the blades 33, and the inter-blade portions 65 are cut out to a length that extend from the outer peripheral edge of the blades 33 to the inner peripheral edges of the blades 33 along the curved shape of the blades 33.
  • the inter-blade portions 65 are used to stack two impellers 43 along the rotational axis O-O.
  • the blades 33 on one impeller 43 can be fit into the corresponding plurality of inter-blade portions 65 on another impeller 43. Two impellers 43 fit together in this way can be stacked together to a predetermined height and then transported.
  • the present experiment is one in which sound measurements were taken from the conventional example shown in Figs. 2 and 3 and the present embodiment shown in Figs. 5 and 6.
  • the wave form members 64 formed on the main plate 61, the wave form members 66 formed on the side plate 62, and the inter-blade portions 65 on the main plate 61 are simultaneously formed in order to reduce noise. Accordingly, in order to confirm the sound reduction effects of these three elements, impellers having only one of each of these three elements were prepared and a sound reduction experiment was conducted on each impeller. The results of these sound reduction experiments are shown below.
  • the special characteristics of the multi-blade fan of the present embodiment are as follows.
  • noise is produced by turbulent vortices generated near the main plate 31. More specifically, the turbulent vortices are generated by the mechanism described below.
  • a portion of the air drawn in from the intake port 11b collides with the main plate 31 in the interior of the impeller 13, and then flows near the main plate 31 toward the outer peripheral side (see air flow X).
  • Turbulent vortices are generated in this air flow X due to the collision with the main plate 31.
  • the turbulent vortices flow with the air flow X toward the outer periphery and further merge with the air flow that collides with the main plate 31.
  • the turbulent vortices in the air flow X then gradually grow, and the biggest turbulent vortices are formed on the inner peripheral edges of the blades 33. These enlarged turbulent vortices are scooped out toward the outer periphery by the blades 33, and this generates noise.
  • the turbulent vortices that grew due to the collision of the air flow Z1 with the main plate 61 and the merger with the air flow will be reduced in size immediately before reaching the blades 33 because the wave form members 64 are formed on at least the side plate 62 side of the main plate 61 near the inner peripheral edges of the blades 33. This allows the noise generated when the air flow Z1 is scooped out by the blades 33 to be reduced.
  • swirling vortices are produced in which the centers thereof are near the outer peripheral edge of the side plate 32.
  • the swirling vortices do not assist the impeller 13 to blow air, and thus as a result, the swirling vortices cause noise and reduced fan efficiency. More specifically, the turbulent vortices are generated by the mechanism described below.
  • a portion of the air inside the casing 11 is scooped out to the outer periphery of the impeller 13, and then swirling vortices Y are produced near the side plate 32 such that air is again drawn in from near the bell mouth 12 of the impeller 13 to the inner peripheral side of the impeller 13. Because of this, a portion of the air cannot be effectively blown, and this portion corresponds to a ratio b/B (hereinafter referred to as blockage factor BF) between a length b in the axial direction of the portion of the impeller 13 that produces the swirling vortices Y and a length B in the axial direction of the entire impeller 13. Because of this, there will be a reduction in fan efficiency and noise will be generated.
  • inter-blade portions 65 of the impeller 43 of the present embodiment are partially cut out from the front side in the rotational direction of the main plate 61, and are not cut out up to the rear side in the rotational direction of the inter-blade portions 65.
  • the inter-blade portions 65 of the impeller 43 of the present embodiment are partially cut out from the front side in the rotational direction of the main plate 61, and are not cut out up to the rear side in the rotational direction of the inter-blade portions 65.
  • the turbulent vortices of the air flow Z3 easily escape from the cut-out inter-blade portions 65 before they arrive at the outer peripheral edges of the blades 33 because the inter-blade portions 65 of the impeller 43 of the present embodiment are cut out from the outer peripheral edges of the blades 33 to the inner peripheral edges thereof. In this way, the turbulent vortices that arrive at the outer peripheral edges of the blades 33 can be further diminished, and noise can be further reduced.
  • the inter-blade portions 65 of the main plate 61 of the impeller 43 of the present embodiment are larger in the circumferential direction that the thickness in the circumferential direction of the blades 33, and the inter-blade portions 65 are cut out to a length that extends from the outer peripheral edges of the blades 33 to the inner peripheral edges of the blades 33 along the curved shape of the blades 33.
  • This shape is used to stack two impellers 43 from the rotational axis O-O, and the blades 33 can be respectively fit into the cut-outs of the plurality of inter-blade portions 65. In this way, the load efficiency when loading the impellers 43 can be improved.
  • a multi-blade fan according to a second embodiment of the present invention substitutes an impeller 113 shown in Figs. 9 and 10 for the impeller 13 of the conventional multi-blade fan 10 shown in Figs. 1 - 3.
  • the impeller 113 is a synthetic resin article that is formed by molding, and includes a main plate 131, a side plate 132, and a plurality of blades 133.
  • the main plate 131 is round, and is rotated about the rotational axis O-O (see Fig. 1) by means of a motor 14.
  • a central hole 131a is provided in the main plate 131, and a rotation shaft of the motor 14 is mounted in the central hole 131a.
  • the plurality of blades 133 are annularly disposed around the rotational axis O-O, and extend along the rotational axis O-O.
  • One end of each blade 133 is fixed to outer peripheral portions of the main plate 131.
  • the side plate 132 is an annular member, and has an inner diameter that is either the same as or slightly larger than an outer diameter of the main plate 131.
  • the outer peripheral edges of the other ends of the plurality of blades 133 are connected to the side plate 132.
  • cut-outs 131b are formed in portions hereinafter referred to as inter-blade portions between adjacent blades 133 on the main plate 131.
  • the cut-outs 131b extend from the outer peripheral edge of the main plate 131 to a position near the inner peripheral edges of the blades 133 in the radial direction. More specifically, the cut-outs 131b extend from the outer peripheral edge of the main plate 131 to a point slightly inside the inner peripheral edges of the blades 133.
  • the widths of the cut-outs 131b in the circumferential direction are larger than the largest width in the circumferential direction of the blades 133.
  • the inter-blade portions of the main plate 131 are cut to be larger than the outer cross-sectional dimensions of the blades 133.
  • the inter-blade portions of the main plate 131 also include front blade plate portions 131c and rear blade plate portions 131d.
  • the front blade plate portions 131c are outer peripheral portions of the main plate 131 that extend from the bases of the blades 133 to the front sides thereof in the rotational direction.
  • the rear blade plate portions 131d are outer peripheral portions of the main plate 131 that extend from the bases of the blades 133 to the rear sides thereof in the rotational direction.
  • an air discharge port 11a and an air intake port 11b that is surrounded by a bell mouth 12, are formed in a casing 11.
  • the intake port 11b faces the side plate 132 of the impeller 113.
  • the discharge port 11a is formed such that it is perpendicular to the intake port 11b, so that air is blown out in a direction approximately perpendicular to the rotational axis O-O of the impeller 113.
  • the cut-outs 131b of the inter-blade portions of the main plate 131 are formed in the portions between the blades 133.
  • the strength of the impeller is not a problem then it is preferable to place the cut-outs on the front sides of the blades in the rotational direction.
  • an impeller 213 shown in Figs. 12 and 13 is employed instead of the impeller 113 of the second embodiment.
  • the impeller 213 includes a main plate 231, a side plate 132, and a plurality of blades 133.
  • the main plate 231 is round, and is rotated about the rotational axis O-O (see Fig. 1) by means of a motor 14.
  • a central hole 231a is provided in the main plate 231, and a rotation shaft of the motor 14 is mounted in the central hole 231a.
  • the plurality of blades 133 are annularly disposed around the rotational axis O-O, and extend along the rotational axis O-O.
  • One end of each blade 133 is fixed to outer peripheral portions of the main plate 231.
  • the side plate 132 is an annular member, and has an inner diameter that is either the same as or slightly larger than an outer diameter of the main plate 231.
  • the outer peripheral edges of the other ends of the plurality of blades 133 are connected to the side
  • cut-outs 231b are formed in portions hereinafter referred to as inter-blade portions between adjacent blades 133 on the main plate 231.
  • the cut-outs 231b extend from the outer peripheral edge of the main plate 231 to a position near the inner peripheral edges of the blades 133 in the radial direction. More specifically, the cut-outs 231b extend from the outer peripheral edge of the main plate 231 to a point slightly inside the inner peripheral edges of the blades 133.
  • the widths of the cut-outs 231b in the circumferential direction are larger than the largest width in the circumferential direction of the blades 133.
  • the inter-blade portions of the main plate 231 are cut to be larger than the outer cross-sectional dimensions of the blades 133.
  • the cut-outs 231b are cut out from the bases on the front sides of the blades 133 in the rotational direction, and there are no plates between the blades and the cut-outs 231b.
  • only rear blade plate portions 231d that extend from the bases of the blades 133 rearward in the rotational direction are present in the inter-blade portions of the main plate 231 (see Fig. 13(b)).
  • the cut-outs 231b are provided in the front portions of the blades 133 in the rotational direction.
  • the impeller 213 will not only maintain its capabilities with respect to situations in which the inter-blade portions are cut out, but will in fact improve its capabilities. This could not be imagined with a prior art impeller, but for the following reasons it is thought that noise will be reduced and the capabilities of the multi-blade fan will improve.
  • the cut-outs 231b are provided in the inter-blade portions of the main plate 231, and thus it is presumed that the turbulent vortices pass through the cut-outs 231b in the direction of the rotational axis O-O immediately before they are scooped out by the blades 133, and that noise will be reduced when compared to conventional impellers that do not have the cut-outs 231b.
  • the inter-blade portions of the main plate 231 of the impeller 213 are cut out from the bases of the blades 133 forward in the rotational direction, and thus the width in the circumferential direction of the rear blade plate portions 231d can be sufficiently maintained, and tendency for the air flow to break away from the blades 133 rearward in the rotational direction can be more effectively controlled. Because of this, it is presumed that this impeller reduces noise more than with the impeller of the second embodiment.
  • a sirocco fan according to an embodiment of the present invention substitutes an impeller 1113 shown in Figs. 14 and 15 for the impeller 13 of the conventional multi-blade fan 10 shown in Figs. 1-3.
  • the impeller 1113 is a synthetic resin article that is unitarily formed by molding a synthetic resin material, and includes a main plate 1131, a side plate 1132, and a plurality of blades 1133.
  • the main plate 1131 is round, and is rotated about the rotational axis O-O (see Fig. 1) by means of a motor 14.
  • a central hole 1131a is provided in the main plate 1131, and a rotation shaft of the motor 14 is mounted in the central hole 1131a.
  • the plurality of blades 1133 are annularly disposed around the rotational axis O-O, and extend along the rotational axis O-O.
  • One end of each blade 1133 is fixed to outer peripheral portions of the main plate 1131.
  • the side plate 1132 is an annular member, and has an inner diameter that is either the same as or slightly larger than an outer diameter of the main plate 1131. The outer peripheral edges of the other ends of the plurality of blades 1133 are connected to the side plate 1132.
  • the plurality of blades 1133 that extend from the main plate 1131 along the rotational axis O-O are curved forward in the rotational direction along their lengths, and the tips (other ends) of the blades 1133 are connected to the side plate 1132.
  • the blades 1133 include main portions 1133a on the main plate 1131 side, and slanted portions 1133b on the side plate 1132 side.
  • the cut-outs 1131b are disposed in the front portions in the rotational direction of the portions to which the blades 1133 of the main plate 1131 are attached (see Figs. 16 and 17).
  • the plurality of blades 1633 that extend from the main plate 1131 are curved forward in the rotational direction along their lengths, and the tips (other ends) of the blades 1533 are connected to the side plate 1132.
  • the blades 1633 include a main portion 1633a on the main plate 1131 side, and a slanted portion 1633b on the side plate 1132 side.
  • the slanted portions 1633b have a small degree of slant forward in the rotational direction on the inner peripheral sides thereof, and have a larger degree of slant forward in the rotational direction on the outer peripheral sides thereof.
  • the present invention was applied to a sirocco fan (one centrifugal fan), but the present invention may also be applied to another centrifugal fan, e.g., a turbo fan.
  • a turbo fan the projecting portions of the blades of the turbo fan (the entire portion of which are slanted) that project toward the main plate along from the rotational axis are cut out therefrom, and the main plate and the plurality of blades may be structured such that the impeller can be unitarily formed with a synthetic resin by only a pair of molds.
  • the shroud that corresponds to the side plate of the sirocco fan is mounted opposite the main plate and the plurality of blades unitarily formed with a synthetic resin.
  • the present invention is applied to a conventional turbo fan in which each blade is molded with a slide mold, the cost of the mold can be reduced as well as the molding time, and thus a low cost turbo fan can be provided, because the main plate and the blades can be formed with only an upper and a lower mold.
  • the noise generated when the air flow is scooped out by the blades of the impeller of the multi-blade fan can be reduced.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
EP02733494A 2001-06-28 2002-06-12 Impulseur pour soufflante multiaubes et soufflante multiaubes dote dudit impulseur Expired - Lifetime EP1411247B1 (fr)

Applications Claiming Priority (7)

Application Number Priority Date Filing Date Title
JP2001196179 2001-06-28
JP2001196180 2001-06-28
JP2001196180A JP4774637B2 (ja) 2001-06-28 2001-06-28 多翼送風機の羽根車及びそれを備えた多翼送風機
JP2001196179A JP4736253B2 (ja) 2001-06-28 2001-06-28 多翼送風機の羽根車及びそれを備えた多翼送風機
JP2001220008 2001-07-19
JP2001220008A JP4945859B2 (ja) 2001-07-19 2001-07-19 遠心送風機の羽根車及びそれを備えた遠心送風機
PCT/JP2002/005883 WO2003002874A1 (fr) 2001-06-28 2002-06-12 Impulseur pour soufflante multiaubes et soufflante multiaubes dote dudit impulseur

Publications (3)

Publication Number Publication Date
EP1411247A1 true EP1411247A1 (fr) 2004-04-21
EP1411247A4 EP1411247A4 (fr) 2004-08-11
EP1411247B1 EP1411247B1 (fr) 2008-09-24

Family

ID=27347039

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02733494A Expired - Lifetime EP1411247B1 (fr) 2001-06-28 2002-06-12 Impulseur pour soufflante multiaubes et soufflante multiaubes dote dudit impulseur

Country Status (6)

Country Link
EP (1) EP1411247B1 (fr)
CN (2) CN1212478C (fr)
AT (1) ATE409287T1 (fr)
DE (1) DE60229060D1 (fr)
ES (1) ES2312576T3 (fr)
WO (1) WO2003002874A1 (fr)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7163371B2 (en) 2003-05-09 2007-01-16 Daikin Industries, Ltd. Centrifugal fan
EP1762729A1 (fr) * 2005-09-08 2007-03-14 Delphi Technologies, Inc. ensemble ventilateur centrifuge
WO2008034049A1 (fr) * 2006-09-15 2008-03-20 The Dial Corporation Soufflante centrifuge pour un purificateur d'air compact
US8235668B2 (en) 2005-12-14 2012-08-07 Panasonic Corporation Multiblade air blower
TWI454619B (zh) * 2010-11-12 2014-10-01 Nidec Corp Air supply fan
CN105252058A (zh) * 2015-11-20 2016-01-20 湖北双剑鼓风机股份有限公司 一种透平叶轮的五轴铣削加工方法
EP3034884A1 (fr) * 2014-12-18 2016-06-22 Samsung Electronics Co., Ltd. Ensemble de ventilateur centrifuge

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20060027916A (ko) * 2004-09-24 2006-03-29 삼성전자주식회사 시로코팬 및 이를 구비한 공기조화기
US10641280B2 (en) 2015-05-22 2020-05-05 Samsung Electronics Co., Ltd. Turbo fan and air conditioner including same

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1284741A (fr) * 1961-02-15 1962-02-16 Machine rotative pour le déplacement de fluides telle que soufflante ou pompe ou analogue
FR1299948A (fr) * 1961-09-08 1962-07-27 élément monté constitutif de rotor de machine à écoulement de fluide et rotor constitué avec des éléments conformes au précédent, ainsi que machine ou appareilpourvus dudit rotor
DE4204531A1 (de) * 1992-02-15 1993-08-19 Pvs Kunststofftechnik Gmbh & C Luefterradvorrichtung
GB2296943A (en) * 1994-12-21 1996-07-17 Valeo Climate Control Ltd Injection moulded radial flow fan wheel
EP0807760A2 (fr) * 1996-05-17 1997-11-19 Calsonic Corporation Rotor multipale pour soufflante radiale
US6158954A (en) * 1998-03-30 2000-12-12 Sanyo Electric Co., Ltd. Cross-flow fan and an air-conditioner using it
US6168734B1 (en) * 1997-12-08 2001-01-02 Visteon Global Technologies, Inc. Method for balancing a centrifugal fan

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0239593U (fr) * 1988-09-06 1990-03-16
JPH0239595U (fr) * 1988-09-06 1990-03-16
JP3191516B2 (ja) * 1993-08-25 2001-07-23 松下電器産業株式会社 電動送風機のインペラ

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1284741A (fr) * 1961-02-15 1962-02-16 Machine rotative pour le déplacement de fluides telle que soufflante ou pompe ou analogue
FR1299948A (fr) * 1961-09-08 1962-07-27 élément monté constitutif de rotor de machine à écoulement de fluide et rotor constitué avec des éléments conformes au précédent, ainsi que machine ou appareilpourvus dudit rotor
DE4204531A1 (de) * 1992-02-15 1993-08-19 Pvs Kunststofftechnik Gmbh & C Luefterradvorrichtung
GB2296943A (en) * 1994-12-21 1996-07-17 Valeo Climate Control Ltd Injection moulded radial flow fan wheel
EP0807760A2 (fr) * 1996-05-17 1997-11-19 Calsonic Corporation Rotor multipale pour soufflante radiale
US6168734B1 (en) * 1997-12-08 2001-01-02 Visteon Global Technologies, Inc. Method for balancing a centrifugal fan
US6158954A (en) * 1998-03-30 2000-12-12 Sanyo Electric Co., Ltd. Cross-flow fan and an air-conditioner using it

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of WO03002874A1 *

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7163371B2 (en) 2003-05-09 2007-01-16 Daikin Industries, Ltd. Centrifugal fan
EP1762729A1 (fr) * 2005-09-08 2007-03-14 Delphi Technologies, Inc. ensemble ventilateur centrifuge
US7311494B2 (en) 2005-09-08 2007-12-25 Delphi Technologies, Inc. Fan and scroll design for high efficiency and low noise
US8235668B2 (en) 2005-12-14 2012-08-07 Panasonic Corporation Multiblade air blower
US9033655B2 (en) 2005-12-14 2015-05-19 Panasonic Corporation Multiblade air blower
WO2008034049A1 (fr) * 2006-09-15 2008-03-20 The Dial Corporation Soufflante centrifuge pour un purificateur d'air compact
TWI454619B (zh) * 2010-11-12 2014-10-01 Nidec Corp Air supply fan
EP3034884A1 (fr) * 2014-12-18 2016-06-22 Samsung Electronics Co., Ltd. Ensemble de ventilateur centrifuge
US10161412B2 (en) 2014-12-18 2018-12-25 Samsung Electronics Co., Ltd. Centrifugal fan assembly
US10954955B2 (en) 2014-12-18 2021-03-23 Samsung Electronics Co., Ltd. Centrifugal fan assembly
CN105252058A (zh) * 2015-11-20 2016-01-20 湖北双剑鼓风机股份有限公司 一种透平叶轮的五轴铣削加工方法

Also Published As

Publication number Publication date
ATE409287T1 (de) 2008-10-15
CN1395046A (zh) 2003-02-05
CN1212478C (zh) 2005-07-27
WO2003002874A1 (fr) 2003-01-09
DE60229060D1 (de) 2008-11-06
EP1411247A4 (fr) 2004-08-11
ES2312576T3 (es) 2009-03-01
CN2572074Y (zh) 2003-09-10
EP1411247B1 (fr) 2008-09-24

Similar Documents

Publication Publication Date Title
US7163371B2 (en) Centrifugal fan
EP3064780B1 (fr) Soufflante et unité d'extérieur de climatiseur comprenant celle-ci
US9046110B2 (en) Crossflow fan and air conditioner provided with same
CN202900768U (zh) 离心式鼓风机
US20080253897A1 (en) Axial Flow Fan
US6572333B2 (en) Air blower
US8192165B2 (en) Impeller of multiblade fan and multiblade fan having the same
EP1411247B1 (fr) Impulseur pour soufflante multiaubes et soufflante multiaubes dote dudit impulseur
JP2014074352A (ja) 遠心式ファン
JP5562566B2 (ja) 流体機械用翼体
EP1411248B1 (fr) Impulseur pour soufflante centrifuge et soufflante centrifuge dotee dudit impulseur
JP2003184792A (ja) 送風機
JP2006322378A (ja) 送風機羽根車
JP2003065293A (ja) 軸流ファン用羽根車
JP2003035293A (ja) 遠心送風機の羽根車及びそれを備えた遠心送風機
JP2002202093A (ja) 遠心送風機及びこれを備えた車両用空調装置
JP2003035294A (ja) 多翼送風機の羽根車及びそれを備えた多翼送風機
JP3726386B2 (ja) 遠心式送風機
JP4736253B2 (ja) 多翼送風機の羽根車及びそれを備えた多翼送風機
JP2004353665A (ja) 多翼遠心送風機
JP3782585B2 (ja) 送風機
JP4736252B2 (ja) 多翼送風機の羽根車及びそれを備えた多翼送風機
JP5269025B2 (ja) 遠心ファン及びこれを備えた空気調和機の室内機
JP2001065496A (ja) 遠心ファン
JP2005194899A (ja) 送風装置、この送風装置の製造方法、及びこの送風装置を有する電子機器

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 20040121

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR

AX Request for extension of the european patent

Extension state: AL LT LV MK RO SI

A4 Supplementary search report drawn up and despatched

Effective date: 20040630

RIC1 Information provided on ipc code assigned before grant

Ipc: 7F 04D 29/30 B

Ipc: 7F 04D 29/28 A

Ipc: 7F 04D 29/66 B

17Q First examination report despatched

Effective date: 20061006

RTI1 Title (correction)

Free format text: IMPELLER FOR MULTIBLADE BLOWER AND MULTIBLADE BLOWER HAVING THE SAME

GRAP Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOSNIGR1

GRAS Grant fee paid

Free format text: ORIGINAL CODE: EPIDOSNIGR3

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR

REG Reference to a national code

Ref country code: GB

Ref legal event code: FG4D

REG Reference to a national code

Ref country code: CH

Ref legal event code: EP

REG Reference to a national code

Ref country code: IE

Ref legal event code: FG4D

REF Corresponds to:

Ref document number: 60229060

Country of ref document: DE

Date of ref document: 20081106

Kind code of ref document: P

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: AT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20080924

Ref country code: FI

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20080924

REG Reference to a national code

Ref country code: ES

Ref legal event code: FG2A

Ref document number: 2312576

Country of ref document: ES

Kind code of ref document: T3

NLV1 Nl: lapsed or annulled due to failure to fulfill the requirements of art. 29p and 29m of the patents act
PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: BE

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20080924

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: PT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20090224

Ref country code: NL

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20080924

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DK

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20080924

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed

Effective date: 20090625

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: MC

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20090630

Ref country code: SE

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20081224

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20090612

Ref country code: CH

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20090630

Ref country code: LI

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20090630

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20081225

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LU

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20090612

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: TR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20080924

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: CY

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20080924

REG Reference to a national code

Ref country code: FR

Ref legal event code: PLFP

Year of fee payment: 15

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 20160608

Year of fee payment: 15

Ref country code: ES

Payment date: 20160510

Year of fee payment: 15

Ref country code: DE

Payment date: 20160607

Year of fee payment: 15

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 20160516

Year of fee payment: 15

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: IT

Payment date: 20160621

Year of fee payment: 15

REG Reference to a national code

Ref country code: DE

Ref legal event code: R119

Ref document number: 60229060

Country of ref document: DE

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 20170612

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

Effective date: 20180228

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20170612

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20180103

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20170630

Ref country code: IT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20170612

REG Reference to a national code

Ref country code: ES

Ref legal event code: FD2A

Effective date: 20181107

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: ES

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20170613