US20130004307A1 - Impeller and centrifugal fan having the same - Google Patents

Impeller and centrifugal fan having the same Download PDF

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Publication number
US20130004307A1
US20130004307A1 US13/490,518 US201213490518A US2013004307A1 US 20130004307 A1 US20130004307 A1 US 20130004307A1 US 201213490518 A US201213490518 A US 201213490518A US 2013004307 A1 US2013004307 A1 US 2013004307A1
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US
United States
Prior art keywords
impeller
shroud
blades
blade
upper 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.)
Abandoned
Application number
US13/490,518
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English (en)
Inventor
Takako Fukuda
Seiya FUJIMOTO
Masaki Ogushi
Yuzuru Suzuki
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.)
Minebea Co Ltd
Original Assignee
Minebea Co 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 Minebea Co Ltd filed Critical Minebea Co Ltd
Assigned to MINEBEA CO., LTD. reassignment MINEBEA CO., LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: FUJIMOTO, SEIYA, FUKUDA, TAKAKO, OGUSHI, MASAKI, SUZUKI, YUZURU
Publication of US20130004307A1 publication Critical patent/US20130004307A1/en
Abandoned legal-status Critical Current

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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
    • F04D17/00—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps
    • F04D17/08—Centrifugal pumps
    • F04D17/16—Centrifugal pumps for displacing without appreciable compression
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D25/00—Pumping installations or systems
    • F04D25/02—Units comprising pumps and their driving means
    • F04D25/06—Units comprising pumps and their driving means the pump being electrically driven
    • F04D25/0606—Units comprising pumps and their driving means the pump being electrically driven the electric motor being specially adapted for integration in the pump
    • F04D25/0613—Units comprising pumps and their driving means the pump being electrically driven the electric motor being specially adapted for integration in the pump the electric motor being of the inside-out type, i.e. the rotor is arranged radially outside a central stator

Definitions

  • the present invention relates to an impeller and a centrifugal fan having the same, and more particularly, to an impeller designed to improve productivity and reduce noise, and a centrifugal fan having the same.
  • a centrifugal fan is a fan for blowing air in a radial direction by rotating an impeller including a plurality of blades (also referred to as wings, impeller).
  • One of this kind of fans is a centrifugal multi-blade fan which includes a casing having a suction opening and a discharge opening and accommodating therein an impeller having a plurality of blades around a rotary shaft of a motor.
  • the centrifugal multi-blade fan suctions air from the suction opening, allows the air flow through the blades from the center of the impeller, and discharges the air outward in the radial direction of the impeller by a centrifugal action from the rotation of the impeller.
  • the air discharged from the outside of the outer circumference of the impeller passes through the casing while increasing the pressure of the air, and the high-pressure air is discharged from the discharge opening.
  • centrifugal multi-blade fans are widely used for cooling, ventilation, and air-conditioning in home appliances, OA equipment, and industrial equipment, and in blowers for vehicles and the like.
  • the blowing performance and noise of such centrifugal multi-blade fan are largely affected by a blade shape of an impeller and a shape of a casing.
  • JP-A-2008-267265 discloses a blower which includes a blowing unit having fan blades around a rotor, a casing for accommodating the blowing unit therein, and a motor unit for driving the blowing unit.
  • the blower includes an upper annular disk provided above the fan blades, and a lower annular disk provided below the fan blades.
  • the inside diameter D 1 of the upper annular disk is almost the same with the outside diameter D 2 of the lower annular disk, and the inside diameter D 1 of the upper annular disk is also almost the same with the diameter D 3 of an opening formed at the upper portion of the casing. Therefore, it is possible to suppress a vortex from occurring at the upper portion of the blowing unit and the inside of the casing, particularly in the vicinity of the opening, during rotation of the blowing unit, so that noise is reduced.
  • JP-A-2007-303340 discloses a blower which includes a casing, an impeller which is disposed in the casing, and a motor for rotating the impeller. Inclined parts are provided on the inner peripheral sides of the upper ends of individual blades, and further, an inclined face is provided on a boss part. Therefore, occurrence of a turbulent vortex can be prevented, so that noise is reduced. Further, since no turbulent vortex occurs, air flow resistance can be lowered, so that an air flow characteristic is improved.
  • JP-A-S51-7509 discloses a technique of providing long blades and short blades to an impeller for a centrifugal blower.
  • An impeller includes a main plate, a side plate, and long blades and short blades which are positioned between the main plate and the side plate.
  • An entrance end of the long blade is in contact with the side plate at a position having an almost same radius with that of an entrance end of the short blade. Further, the entrance end of the long blade is designed to become closer to the main plate as approaching to the center of a rotary shaft.
  • the discrete frequency noise is noise based on a blade passing frequency, and is also called as NZ noise.
  • the present invention has been made in view of the above circumstances, and it is an object of the present invention is to provide a high-productivity impeller having a blade shape appropriate for an air flow, and a centrifugal fan having the same.
  • an impeller comprising: a lower shroud; an upper shroud; and a plurality of blades which are arranged along a circumference direction between the lower shroud and the upper shroud.
  • the impeller is rotatable around a rotary shaft.
  • An outside diameter of the lower shroud is equal to or smaller than an inside diameter of the upper shroud.
  • An inside portion of each of the blades has an inclined portion which connects an inside circle portion of the upper shroud and an inside circle portion of the lower shroud.
  • the upper shroud in a range where the upper shroud and the blades exist in a planar view, the upper shroud may be in contact with the blades.
  • each of the plurality of blades may have a shape which becomes thinner as separating further from the rotary shaft.
  • a centrifugal fan comprising: the above impeller; and a lower casing which is provided at a lower portion of the impeller.
  • the lower casing has a protrusion which protrudes toward the impeller in a portion where the upper shroud exists in a planar view. Air suctioned from a suction opening is discharged outward in a radial direction of the impeller by a centrifugal force from the rotation of the impeller.
  • FIG. 1 is a perspective view illustrating a centrifugal fan according to an illustrative embodiment of the present invention
  • FIG. 2 is a view illustrating a longitudinal section at a middle part of the centrifugal fan of FIG. 1 ;
  • FIG. 3 is a perspective view illustrating an impeller 3 as seen from a side of an upper shroud 23 ;
  • FIG. 4 is a view illustrating a blade shape of the centrifugal fan of FIG. 1 as seen from a side of the upper shroud 23 ;
  • FIG. 5 is a cross-sectional view taken along line A-A of FIG. 4 ;
  • FIG. 6 is a cross-sectional view taken along line B-B of FIG. 4 ;
  • FIG. 7 is a cross-sectional view taken along line C-C of FIG. 4 ;
  • FIGS. 8A and 8B are views illustrating a cross-sectional shape and noise characteristic of a related-art impeller, respectively;
  • FIGS. 9A and 9B are views illustrating a cross-sectional shape and noise characteristic of the impeller according to an illustrative embodiment of the present invention, respectively.
  • FIG. 10 is a cross-sectional view illustrating an impeller of a centrifugal fan according to a modified illustrative embodiment.
  • FIG. 1 is a perspective view illustrating a centrifugal fan according to an illustrative embodiment of the present invention
  • FIG. 2 is a view illustrating a longitudinal section at a middle part of the centrifugal fan of FIG. 1
  • FIG. 3 is a perspective view illustrating an impeller 3 as seen from a side of an upper shroud 23
  • FIG. 4 is a view illustrating a blade shape of the centrifugal fan of FIG. 1 as seen from the side of the upper shroud 23
  • FIGS. 5 to 7 are cross-sectional views taken along lines A-A, B-B, and C-C of FIG. 4 , respectively.
  • a central impeller 3 rotates to blow air.
  • the impeller 3 includes seven blades 2 disposed at regular intervals, and rotates around a rotary shaft 11 by a fan motor 13 provided in the centrifugal fan 1 .
  • the direction of the rotation is a clockwise direction in FIG. 4 .
  • the impeller 3 is accommodated in a casing 4 .
  • the casing 4 is configured by an upper casing 5 and a lower casing 6 which have plate shape, and in order to place the upper casing 5 and the lower casing 6 evenly spaced apart from each other, four columnar supports 7 are provided at four corners of the casing 4 , respectively.
  • an air suction opening 8 is formed at the top of the centrifugal fan 1 .
  • Air discharge openings 9 are provided between the respective columnar supports 7 of the casing 4 . In other words, the air discharge openings 9 are provided at four sides of the casing 4 in four directions (open casing type).
  • the casing 4 may have one discharge opening for collecting air discharged from the impeller 3 in one direction (scroll casing type).
  • the impeller 3 has an annular lower shroud 21 , an annular upper shroud 23 , and a plurality of blades 2 which are arranged along a circumference direction between the lower shroud 21 and the upper shroud 23 , and is rotatable around the rotary shaft 11 .
  • the annular lower shroud 21 has an inside circle 21 A and an outside circle 21 B in a planar view.
  • the inside circle 21 A and the outside circle 21 B are circles in a planar view.
  • the annular upper shroud 23 has an inside circle 23 A and an outside circle 23 B in a planar view.
  • the inside circle 23 A and the outside circle 23 B are circles in a planar view.
  • the outside circle 21 B of the lower shroud 21 overlaps the inside circle 23 A of the upper shroud 23 .
  • the outside circle 21 B of the lower shroud 21 is the same as the inside circle 23 A of the upper shroud 23 .
  • the outside circle 21 B of the lower shroud 21 may be slightly smaller than the inside circle 23 A of the upper shroud 23 .
  • each blade 2 seen from the internal space of the inside circle 23 A of the upper shroud 23 is shown by a solid line. Further, the shape of each blade 2 hidden between the inside circle 23 A and outside circle 23 B of the upper shroud 23 by the upper shroud 23 is shown by a dotted line.
  • each blade 2 has a shape tapering from the inside (rotary shaft) to the outside in a planar view. In other words, each blade 2 has a shape becoming thinner as separating further from the rotary shaft 11 .
  • Each blade 2 has an inlet angle of 45° and an outlet angle 22°.
  • the diameter of the outside circle 23 B is 120 mm, and the diameter of the inside circle 21 A is 70 mm.
  • the blades 2 are backward inclined blades.
  • each blade 2 is fixed to the lower surface of the upper shroud 23
  • the lower portion of each blade 2 is fixed to the upper surface of the lower shroud 21 .
  • the outside circle 21 B of the lower shroud 21 is designed to be the same as the inside circle 23 A of the upper surface (or the outside circle 21 B of the lower shroud 21 is smaller than the inside circle 23 A of the upper surface), it is possible to integrally form the impeller 3 only by using upper and lower molds.
  • the inside circle side (the side close to the rotary shaft) of the upper portion of each blade 2 is connected to the inside-circle-side end portion of the upper shroud 23 . From this position to the outside-diameter-side end portion of the upper portion of each blade 2 , the upper portion of each blade 2 is connected to the lower surface of the upper shroud 23 .
  • the upper shroud 23 is in contact with the blades 2 in a range where the upper shroud 23 and the blades 2 exist (a place surrounded by a dotted line) in a planar view.
  • each blade 2 is connected to the lower shroud 21 .
  • the inside circle side of the upper portion of each blade 2 is connected to the inside-circle-side end portion of the upper shroud 23 .
  • the upper portion of each blade 2 has a tapered portion (inclined portion) from that position toward the inside circle side.
  • the inside circle portion of each blade 2 has an inclined portion which connects the inside circle portion (inside-circle end portion) of the upper shroud 23 and the inside circle portion of the lower shroud 21 .
  • each blade 2 forms an inclined surface having an angle ⁇ of 42° with respect to a vertical direction.
  • a portion of each blade 2 shown by a solid line is a tapered portion
  • a portion of each blade 2 shown by a dotted line shows a portion in which the upper portion of the corresponding blade 2 is connected with the upper shroud 23 .
  • the portion of each blade 2 shown by the solid line shows a portion in which the lower portion of the corresponding blade 2 is connected with the lower shroud 21 .
  • the portion of each blade 2 shown by the dotted line shows a portion in which the lower portion of the corresponding blade 2 is not connected with the lower shroud 21 (a portion below which the lower shroud 21 does not exist).
  • the angle ⁇ which is 42° in FIG. 5 , is called a taper angle, and the angle ⁇ is not limited to 42°.
  • the lower shroud 21 does not exist in a portion in which the upper shroud 23 exists in a planar view. Therefore, it is preferable to provide a protrusion 6 a at the upper portion of the lower casing 6 as shown in FIG. 2 such that the protrusion 6 a protrude upward and takes place of the lower shroud 21 at the portion of the impeller 3 in which the lower shroud 21 does not exist.
  • the protrusion 6 a is formed at the portion where the upper shroud 23 exists (the portion where the lower shroud 21 does not exist) in a planar view such that a distance between the lower portion of each blade 2 and the lower casing 6 becomes shorter.
  • the protrusion 6 a protrudes to a height at which the lower shroud 21 exists. In this way, it is possible to allow the lower casing 6 to have a structure for acting as the lower shroud.
  • the inside circle portion of each blade 2 has a tapered shape.
  • the base portion of the tapered portion is integrated with the lower shroud 21 .
  • the upper portion of each blade 2 is entirely integrated with the upper shroud 23 except for the tapered portion.
  • the inside diameter Dl of the upper shroud 23 is the almost the same as the outside diameter D 2 of the lower shroud 21 (D 1 ⁇ D 2 ) or may be larger than the outside diameter D 2 of the lower shroud 21 (D 1 ⁇ D 2 ).
  • This shape makes it possible to integrally form the impeller 3 only by upper and lower molds and provide the high-productivity impeller 3 and the high-productivity centrifugal fan 1 .
  • centrifugal fan 1 it is possible to improve an air flow by the tapered shape of each blade 2 . Moreover, it is possible to cover the suction opening portion with the shrouds. Therefore, it is possible to reduce noise. This feature will be described below.
  • FIGS. 8A and 8B are views illustrating a cross-sectional shape and noise characteristic of a related-art impeller, respectively.
  • a related-art impeller 3 ′ includes a lower shroud 21 ′, an upper shroud 23 ′, and a plurality of blades 2 ′ disposed between the lower shroud 21 ′ and the upper shroud 23 ′.
  • the outside circle of the lower shroud 21 ′ is the same as the outside circle of the upper shroud 23 ′. Therefore, it is not possible to integrally form the impeller 3 ′ only by upper and lower molds.
  • FIG. 8B shows a noise characteristic during driving of the impeller 3 ′ of FIG. 8A by taking frequencies on a horizontal axis and noise values (dB(A)) on a vertical axis.
  • Noise is 58.0 dB(A) in total, and both of discrete frequency noise and wideband noise (turbulence noise) shows high values as shown in FIG. 8B .
  • FIGS. 9A and 9B are views illustrating a cross-sectional shape and noise characteristic of the impeller according to the illustrative embodiment of the present invention, respectively.
  • the impeller 3 As shown in the cross-sectional view of FIG. 9A , the impeller 3 according to the present illustrative embodiment includes the lower shroud 21 , the upper shroud 23 , and the plurality of blades 2 disposed between the lower shroud 21 and the upper shroud 23 .
  • the outside circle of the lower shroud 21 is almost the same as the inside circle of the upper shroud 23 . Therefore, it is possible to integrally form the impeller only by upper and lower molds.
  • FIG. 9B shows a noise characteristic during driving of the impeller of FIG. 9A by taking frequencies on a horizontal axis and noise values (dB(A)) on a vertical axis.
  • Noise is 57.3 dB(A) in total. Further, as shown in a solid line circle of FIG. 9B , discrete frequency noise (the primary and secondary noise of the blades) is lower than that in FIG. 8B . Furthermore, as shown in a dotted line circuit of FIG. 9B , wideband noise (turbulence noise) is also lower than that in FIG. 8B .
  • FIG. 10 is a cross-sectional view illustrating an impeller of a centrifugal fan according to a modified illustrative embodiment.
  • An impeller 3 according to the modified illustrative embodiment is different from the impeller shown in FIGS. 1 to 7 in that a base plate (plate) 21 a for expending the outside circle of the lower shroud 21 outward is attached at the lower portion of the impeller 3 .
  • the diameter (inside diameter) of a hollow portion of the base plate 21 a is the same as the outside diameter of the lower shroud 21 .
  • the outside diameter of the base plate 21 a is the same as the outside diameter of the upper shroud 23 . Therefore, it is possible to make the outside circle of the upper shroud 23 coincide with the outside circle of the base plate 21 a , and to secure the same P-Q characteristic as that of the configuration of the impeller 3 as shown in FIGS. 8A .
  • the base plate 21 a functions as an appendant lower shroud. Since the base plate 21 a is attached, it is also possible to reduce noise while maintaining the P-Q characteristic.
  • the portion of the impeller 3 except for the base plate 21 a can be integrally formed only by upper and lower molds, such that the productivity of the impeller is improved.
  • the fan according to the illustrative embodiment is adaptable to all centrifugal fans such as a turbo type, a multi-blade type, and a radial type.
  • the fan can be mainly installed in products requiring suction and cooling (such as home appliances, PCs, OA equipment, and in-vehicle equipment) and the like.
  • the impeller according to the illustrative embodiment the upper shroud does not overlap the lower shroud at all in a planar view. Therefore, it is possible to manufacturing the impeller by integral molding using upper and lower molds, and thus the productivity of the impeller is high.
  • the upper portion of the inside circle portion of each blade contacts the top of the upper shroud.
  • the inside circle portion of each blade lowers from that position to a lower portion with an inclination (the taper angle ⁇ ), so that the lower portion of the inside circle portion of the corresponding blade comes into contact with the lower shroud. Therefore, the diameter of the suction opening does not increase, and thus the highest static pressure is not reduced.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
US13/490,518 2011-06-30 2012-06-07 Impeller and centrifugal fan having the same Abandoned US20130004307A1 (en)

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JP2011145144A JP5809859B2 (ja) 2011-06-30 2011-06-30 遠心式ファン
JP2011-145144 2011-06-30

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Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20150118037A1 (en) * 2013-10-28 2015-04-30 Minebea Co., Ltd. Centrifugal fan
US20150342086A1 (en) * 2012-11-12 2015-11-26 Panasonic intellectual property Management co., Ltd Cooling device, and heating element housing device equipped with same
US20160108924A1 (en) * 2014-10-17 2016-04-21 Mean Green Products, LLC Battery-powered, low-noise backpack blower
US9394920B2 (en) 2012-08-10 2016-07-19 Minebea Co., Ltd. Centrifugal fan
CN105945533A (zh) * 2016-05-18 2016-09-21 重庆通用工业(集团)有限责任公司 离心通风机叶片成型方法
US20180149158A1 (en) * 2015-05-14 2018-05-31 Denso Corporation Centrifugal blower
US10327392B2 (en) 2014-11-05 2019-06-25 Mean Green Products, LLC Battery-powered debris blower
US11009032B2 (en) 2017-09-29 2021-05-18 Nidec Corporation Centrifugal fan
US11032973B2 (en) 2019-07-26 2021-06-15 Generac Power Systems, Inc. Battery-operated electric mower
US11690318B2 (en) 2018-10-17 2023-07-04 Generac Power Systems, Inc. Deck height control system

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CN103947392A (zh) * 2014-05-12 2014-07-30 谢娟 一种用于粮食脱粒机的静音式鼓风装置
CN104279188B (zh) * 2014-10-29 2017-08-01 珠海格力电器股份有限公司 离心式风机及具有其的空调器
JP6822104B2 (ja) * 2016-12-01 2021-01-27 株式会社ノーリツ 羽根車、給湯器、樹脂成形用金型、および羽根車の製造方法
CN113187762A (zh) * 2021-05-07 2021-07-30 青岛丙田机电科技有限公司 一种直流半球式风轮及风机
JP2023054481A (ja) * 2021-10-04 2023-04-14 株式会社デンソー 遠心式送風機

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JPS517509A (ja) 1974-07-08 1976-01-21 Ebara Mfg Enshinsofukyohaneguruma
JPS60261997A (ja) * 1984-06-08 1985-12-25 Hitachi Ltd 遠心送風機用羽根車の成形方法
JP2007303340A (ja) 2006-05-10 2007-11-22 Sony Corp 送風装置及び羽根車
WO2008111368A1 (ja) * 2007-03-14 2008-09-18 Mitsubishi Electric Corporation 遠心ファン、空気調和機
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US4647271A (en) * 1984-06-08 1987-03-03 Hitachi, Ltd. Impeller of centrifugal blower

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9394920B2 (en) 2012-08-10 2016-07-19 Minebea Co., Ltd. Centrifugal fan
US20150342086A1 (en) * 2012-11-12 2015-11-26 Panasonic intellectual property Management co., Ltd Cooling device, and heating element housing device equipped with same
US20150118037A1 (en) * 2013-10-28 2015-04-30 Minebea Co., Ltd. Centrifugal fan
US20160108924A1 (en) * 2014-10-17 2016-04-21 Mean Green Products, LLC Battery-powered, low-noise backpack blower
US10327392B2 (en) 2014-11-05 2019-06-25 Mean Green Products, LLC Battery-powered debris blower
US20180149158A1 (en) * 2015-05-14 2018-05-31 Denso Corporation Centrifugal blower
CN105945533A (zh) * 2016-05-18 2016-09-21 重庆通用工业(集团)有限责任公司 离心通风机叶片成型方法
US11009032B2 (en) 2017-09-29 2021-05-18 Nidec Corporation Centrifugal fan
US11690318B2 (en) 2018-10-17 2023-07-04 Generac Power Systems, Inc. Deck height control system
US11032973B2 (en) 2019-07-26 2021-06-15 Generac Power Systems, Inc. Battery-operated electric mower

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JP5809859B2 (ja) 2015-11-11
CN202926712U (zh) 2013-05-08
JP2013011239A (ja) 2013-01-17
DE102012105838A1 (de) 2013-01-03

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