EP1923572B1 - Electric blower and electric cleaner using the same - Google Patents

Electric blower and electric cleaner using the same Download PDF

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Publication number
EP1923572B1
EP1923572B1 EP07012832.7A EP07012832A EP1923572B1 EP 1923572 B1 EP1923572 B1 EP 1923572B1 EP 07012832 A EP07012832 A EP 07012832A EP 1923572 B1 EP1923572 B1 EP 1923572B1
Authority
EP
European Patent Office
Prior art keywords
impeller
inlet
passage
hub
electric blower
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
EP07012832.7A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1923572A2 (en
EP1923572A3 (en
Inventor
Hiroyuki Kayama
Kazushige Nakamura
Shizuka Yokote
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.)
Panasonic Corp
Original Assignee
Panasonic 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 Panasonic Corp filed Critical Panasonic Corp
Publication of EP1923572A2 publication Critical patent/EP1923572A2/en
Publication of EP1923572A3 publication Critical patent/EP1923572A3/en
Application granted granted Critical
Publication of EP1923572B1 publication Critical patent/EP1923572B1/en
Expired - Fee Related 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
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
    • F04D29/44—Fluid-guiding means, e.g. diffusers
    • 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
    • F04D25/00—Pumping installations or systems
    • F04D25/02—Units comprising pumps and their driving means
    • F04D25/08—Units comprising pumps and their driving means the working fluid being air, e.g. for ventilation
    • F04D25/082—Units comprising pumps and their driving means the working fluid being air, e.g. for ventilation the unit having provision for cooling the motor
    • 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
    • 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
    • F04D29/58—Cooling; Heating; Diminishing heat transfer
    • F04D29/5806—Cooling the drive system
    • 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
    • F05D2250/00—Geometry
    • F05D2250/70—Shape

Definitions

  • the present invention relates to an electric blower capable of enhancing the blowing efficiency of an impeller, and to an electric cleaner using the electric blower.
  • Prior art document WO 87/06981 discloses a centrifugal supercharger, wherein an impeller with blades is arranged such that a flow path for an air flow through the impeller increases in the cross-sectional area radially outwards.
  • the cross-section is taken perpendicular to the direction of the air flow through the impeller and the space is defined between a baseplate and a surface of revolution defined by the edges of the blades remote from the baseplate.
  • the shrouds are provided so that they can be moved to vary the performance of the supercharger and according to prevailing conditions.
  • Prior art document JP 2006 009669 A discloses a centrifugal blower, wherein the efficiency of the blower is improved by linearizing the change in the wind speed from the inside diameter to the outside diameter of a shroud.
  • the shroud in the air flowing direction through the centrifugal blower (through an impeller) the shroud is inclined and is formed in such an arcuate shape in a radial cross-section so that the change in wind speed from the inside to the outside diameter of the shroud becomes linear.
  • Prior art document DE 958 147 C discloses a blower for a vacuum cleaner wherein the cross-section of an inlet is provided with a favourable shape to obtain a smooth air flow.
  • the components of the blower are made of plastic material and metal sheets.
  • impeller 40 in a conventional electric blower, impeller 40 includes front shroud 41, rear shroud 42 and a plurality of blades 43 provided between front and rear shrouds 41 and 42.
  • Front shroud 41 is inclined such that a distance between front shroud 41 and rear shroud (base plate) 42 is gradually decreased as it goes from the central portion of the impeller 40 to the outer edge thereof (a > b > c > d).
  • front shroud 41 is of a curved shape in a radial cross-section thereof. In this way, as shown in Fig.
  • the front shroud is opened at an inlet of impeller 40 and a direction of a flow of the air drawn therethrough is bent from a direction parallel to a rotating shaft of impeller 40 to a radial direction, and thus, the above-mentioned linear relationship from the inlet to the outlet of the impeller cannot be realized with only the variation in the distance between front and rear shrouds 41 and 42 and the curved shape of front shroud 41. Accordingly, it is impossible to design the passage to have a sufficient cross-sectional area to satisfactorily enhance the blowing efficiency of the impeller.
  • an object of the present invention to provide an electric blower capable of satisfactorily enhancing the blowing efficiency of an impeller from an inlet to an outlet thereof, and to an electric cleaner using the electric blower.
  • an electric blower of the present invention includes an impeller having a front shroud, a rear shroud and a plurality of blades provided there between; and an inducer having a hub provided in the impeller, wherein an area of a passage cross-section perpendicular to the center line of a passage running from an inlet to an outlet of the impeller, defined by the front shroud, the rear shroud and the hub of the inducer, is monotonically increased from the inlet to the outlet.
  • the electric cleaner using the electric blower has a high suction performance, thus achieving a satisfactory cleaning operation.
  • an electric blower including: an impeller having a front shroud, a rear shroud, and a plurality of main blades provided between the front and rear shrouds; an inducer having a hub disposed in an inlet of the impeller; an air guide provided around the circumferential outer edge of the impeller; a casing enclosing the impeller and the air guide and having an intake opening at a central position thereof; and an electric motor rotating the impeller, wherein the area of a passage cross-section perpendicular to the center line of a passage extending from the inlet to an outlet of the impeller, defined by the front shroud, the rear shroud and the hub of the inducer, is monotonically increased from the inlet to the outlet.
  • the air flow speed depending on the flow rate in the impeller is gradually decreased throughout the entire passage from the inlet to the outlet, and acceleration and rapid deceleration of the air flow speed is not repeated, so that the blowing efficiency of the electric blower can be satisfactorily enhanced.
  • the monotonic increase in the passage cross-sectional area is substantially linear.
  • the air flow speed depending on the flow rate in the impeller decreases at a constant rate with respect to the flow direction in the cross-section of the rotating shaft, thus preventing the air flow speed from abruptly decreasing.
  • a variation rate of the monotonic increase in the passage cross-sectional area from the inlet of the impeller to the outer edge of the hub preferably differs from that from the outer edge of the hub to the outlet.
  • the portion from the inlet to the hub outer edge and the portion from the hub outer edge to the outlet can be separately designed.
  • the portion adjacent to the inlet is configured such that the passage cross-sectional area is monotonically increased at a variation rate that makes it possible to reduce loss attributable to a secondary current or a vortex due to a separation of air flow occurring when the air flow drawn through the inlet is varied from the direction of the rotating shaft to the radial direction.
  • the portion adjacent to the outlet is configured such that the passage cross-sectional area monotonically increases at a variation rate that makes it possible to reduce loss attributable to rotational friction (rotational friction loss) between air and the surface of the impeller or a vortex due to a separation of air flow occurring when the air is discharged in the radial direction. As a result, the blowing efficiency can be enhanced.
  • the variation rate of the monotonic increase in the passage cross-sectional area from the inlet of the impeller to the outer edge of the hub is greater than that from the outer edge of the hub to the outlet.
  • the monotonic increase in the passage cross-sectional area can be made to be substantially linear.
  • the air flow speed depending on the flow rate in the impeller decreases at a constant rate with respect to the flow direction in the cross-section of the rotating shaft, thus preventing a rapid deceleration.
  • variation rate of the monotonic increase in the passage cross-sectional area from the inlet of the impeller to a position at an upstream side of the outer edge of the hub may differ from that from a position at a downstream side of the outer edge of the hub to the outlet, each variation rate of the monotonic increases being substantially linear, and a curved variation section may be provided between the positions at the upstream and the downstream side of the outer edge of the hub to connect the monotonic increase sections of the passage cross-sectional area. Accordingly, the passage cross-sectional area can smoothly and monotonically increase from the inlet of the impeller to the hub outer edge and from the hub outer edge to the outlet, so that the flow speed of components depending on the flow rate in the impeller can be smoothly decreased.
  • the passage has a parallel section, which is substantially parallel to a direction of a rotating shaft, at the inlet of the impeller.
  • a parallel section which is substantially parallel to a direction of a rotating shaft, at the inlet of the impeller.
  • air is drawn into the inlet of the impeller in the direction parallel to the rotating shaft, and the air flow in the direction parallel to the rotating shaft can be smoothly changed in a radial direction.
  • the inducer may be made of resin
  • the front shroud, the rear shroud and the blades may be made of sheet metal. Accordingly, the passage in the inducer adjacent to the inlet of the impeller and the passage in the sheet metal part (defined by the front shroud and the rear shroud) adjacent to the outlet can be separately manufactured by using different methods, so that the impeller can be made with ease.
  • an electric cleaner including the electric blower, thus ensuring a high suction performance and a satisfactory cleaning operation.
  • Figs. 1 to 4B illustrate an electric blower in accordance with a first embodiment of the present invention.
  • the electric blower in accordance with the first embodiment includes impeller 1 having front shroud 2, rear shroud 3 and a plurality of blades 4 provided between front and rear shrouds 2 and 3; inducer 8 having hub 6 of a conical shape disposed in inlet 5 of impeller 1 and inlet guide vanes 7 coupled to respective blades 4, inlet guide vanes 7 having a three-dimensionally curved surface; air guide 11 having a plurality of stationary vanes 9 provided around the circumferential outer edge of impeller 1 and base plate 10; casing 13 enclosing impeller 1 and air guide 11 and having at its central portion intake opening 12 corresponding to inlet 5 of impeller 1; and electric motor 14 for rotating impeller 1.
  • cross-sectional area of the passage In a passage extending from inlet 5 to outlet 25 defined by front and rear shrouds 2 and 3 of impeller 1 and hub 6 of inducer 8, cross-sectional area of the passage, taken perpendicular to the center line of the passage, continuously increases without decreasing, that is, monotonically increases in a general sense.
  • front shroud 2, rear shroud 3 and blades 4 of impeller 1 are made of metal sheets. These three elements are coupled to each other through, e.g., a caulking.
  • Inducer 8 is made of resin. At a time when the three elements (front shroud 2, rear shroud 3 and blades 4) are assembled, inducer 8 is inserted therein to be fastened together. Inducer 8 is connected to the impeller 1 at outer edge 26 of hub 6, and inlet guide vanes 7 are connected to respective blades 4.
  • a configuration of a cross-section (a meridian cross-section) of the passage from inlet 5 to outlet 25, which is defined by front and rear shrouds 2 and 3 and hub 6 of inducer 8, taken in the direction of rotating shaft 16, is shown in Fig. 3 .
  • front curved line 19 of front shroud 2 and rear curved line 20 continuously formed of hub 6 and rear shroud 3 that is further extended beyond hub 6.
  • the area of an annular surface, formed by rotating each passage cross-section defining line 22 around the rotating shaft 16, defines the passage cross-sectional area at each corresponding position.
  • passage cross-sectional areas at the respective corresponding positions from inlet 5 to outlet 25 along passage center curved line 21 monotonically increase such that the variation in the passage cross-sectional areas becomes substantially linear as illustrated in the graph of Fig. 4A . Accordingly, air flow speed from inlet 5 to outlet 25 is linearly decreased as illustrated in the graph of Fig. 4B .
  • passage center curved line 21 is obtained by dividing each of front curved line 19 and rear curved line 20 into a same number of sections at regular intervals, connecting each pair of corresponding section points 23 by section lines 24, and drawing a curved line passing through the middle points of respective section lines 24.
  • the air discharged from impeller 1 flows between the stationary vanes 9 of the air guide 11 and strikes the circumferential sidewall of casing 13 (as designated by the arrow E). Then, the air flows along the rear surface of air guide 11 (designated by arrow F) and passes through electric motor 14 while cooling the interior of electric motor 14 (designated by arrow G). Subsequently, the air is discharged outside electric motor 14 through a discharge hole formed in electric motor 14 (as indicated by arrow H).
  • the area of the passage cross-section monotonically increases in such a manner that the flow speed of components depending on the flow rate in impeller 1 (components in the cross-section direction of rotating shaft 16) gradually decreases throughout the whole passage from inlet 5 to outlet 25 without any abrupt decrease, which results in a significant increase of the blowing efficiency.
  • the monotonic increase in the passage cross-sectional area is made to be substantially linear as shown in Fig. 4A , and thus the flow speed of components depending on the flow rate in impeller 1 (components in the cross-section direction of rotating shaft 16) decreases at a constant rate with respect to the flow direction in the cross-section of rotating shaft 16, which prevents the air flow speed from abruptly decreasing.
  • the section from inlet 5 to hub outer edge 26 and the section from hub outer edge 26 to outlet 25 may be separately designed.
  • the passage cross-sectional area is monotonically increased in such a way that it reduces the loss attributable to, e.g., a secondary current or a vortex due to a separation of air flow occurring when the flow direction of the air drawn through inlet 5 is changed from the direction along the rotating shaft 16 to the radial direction.
  • the passage cross-sectional area is monotonically increased in such a manner that it reduces the loss attributable to, e.g., rotational friction (rotational friction loss) between air and the surface of impeller 1 or a vortex due to a separation of air flow occurring until the air is discharged in the radial direction. In this way, the blowing efficiency can be enhanced.
  • the variation rate of the monotonic increase in the passage cross-sectional area of impeller 1 from inlet 5 to hub outer edge 26 is set to be greater than that of the passage cross-sectional area from hub outer edge 26 to outlet 25.
  • the monotonic increase in the passage cross-sectional area of impeller 1 from inlet 5 of impeller 1 to a position A1 at upstream side of hub outer edge 26 differs from that in the passage cross-sectional area from a position A2 at downstream side of hub outer edge 26 to outlet 25, each monotonic increase being substantially linear.
  • curved variation section 27 is provided between positions A1 and A2, which connects the substantially linear monotonic increase sections at the sides of inlet 5 and outlet 25.
  • the passage cross-sectional area can smoothly and monotonically increase from inlet 5 of impeller 1 to hub outer edge 26 and from hub outer edge 26 to outlet 25, so that the flow speed of components depending on the flow rate in impeller 1 (components in the cross-section of rotating shaft 16) can be smoothly decreased.
  • a third embodiment of the present invention will be described with reference to Figs. 7A and 7B .
  • the general configurations of the electric blower in accordance with the third embodiment are the same as those of the first embodiment, and redundant descriptions thereof will be omitted.
  • impeller 1 has parallel section 28 of the passage, which is substantially parallel to the direction of rotating shaft 16, near the ends of front shroud 2 and hub 6 around inlet 5 of impeller 1, thus forming a ring-shaped intake passage which is parallel to rotating shaft 16.
  • a fourth embodiment of the present invention will be described with reference to Figs. 8A and 8B .
  • the general configurations of the electric blower in accordance with the fourth embodiment are the same as those of the first embodiment, and redundant descriptions thereof will be omitted.
  • Fig. 8A illustrates an inducer
  • Fig. 8B shows the impeller from which the inducer has been removed.
  • inducer 8 included in impeller 1 is made of resin, and front shroud 2, rear shroud 3 and blades 4 are made of sheet metal.
  • a passage cross-sectional area at hub outer edge 26 is made to be parallel to the direction of rotating shaft 16.
  • passage cross-section defining line 22 at hub outer edge 26 is perpendicular to rear shroud 3.
  • impeller 1 can be manufactured with ease.
  • Fig. 9 illustrates an electric cleaner in accordance with a fifth embodiment of the present invention.
  • electric blower 30 is installed in cleaner body 29, so that dust along with air is drawn into cleaner body 29 through intake nozzle 31. The drawn dust is collected in dust collection chamber 32.
  • any one of the electric blowers in accordance with the first through fourth embodiments can be used as electric blower 30, thus increasing the suction performance of the electric cleaner and reducing the energy consumption thereof.
  • an electric blower in accordance with the present invention can satisfactorily increase blowing efficiency and, therefore, can be widely applied to other household electrification appliances, industrial apparatuses and the like as well as the electric cleaner.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Electric Suction Cleaners (AREA)
EP07012832.7A 2006-11-14 2007-06-29 Electric blower and electric cleaner using the same Expired - Fee Related EP1923572B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2006307424A JP4867596B2 (ja) 2006-11-14 2006-11-14 電動送風機およびこれを用いた電気掃除機

Publications (3)

Publication Number Publication Date
EP1923572A2 EP1923572A2 (en) 2008-05-21
EP1923572A3 EP1923572A3 (en) 2010-10-20
EP1923572B1 true EP1923572B1 (en) 2015-07-29

Family

ID=38596185

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07012832.7A Expired - Fee Related EP1923572B1 (en) 2006-11-14 2007-06-29 Electric blower and electric cleaner using the same

Country Status (4)

Country Link
EP (1) EP1923572B1 (ko)
JP (1) JP4867596B2 (ko)
KR (1) KR101287250B1 (ko)
CN (2) CN100516546C (ko)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010196694A (ja) * 2009-01-30 2010-09-09 Sanyo Electric Co Ltd 遠心式送風機、及び空気調和装置
JP5107306B2 (ja) * 2009-06-10 2012-12-26 三菱重工業株式会社 遠心回転機のインペラの製造方法及び遠心回転機のインペラ
JP5520550B2 (ja) * 2009-09-09 2014-06-11 日立アプライアンス株式会社 電動送風機及びそれを備えた電気掃除機
EP2538087A4 (en) * 2010-02-17 2015-01-21 Panasonic Corp DRIVER, ELECTRIC BLOWER THEREOF AND ELECTRIC CLEANER WITH ELECTRIC BLOWER
CN104279185B (zh) * 2014-06-12 2018-01-30 莱克电气股份有限公司 一种叶轮
CN104279182B (zh) * 2014-06-12 2018-01-30 莱克电气股份有限公司 一种叶轮结构
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
JPWO2017141758A1 (ja) * 2016-02-15 2018-10-11 パナソニックＩｐマネジメント株式会社 電動送風機
WO2017203641A1 (ja) * 2016-05-25 2017-11-30 三菱電機株式会社 電動送風機、電気掃除機およびハンドドライヤー
JP6765278B2 (ja) * 2016-10-19 2020-10-07 日立グローバルライフソリューションズ株式会社 電動送風機及びそれを搭載した電気掃除機
CN111173762B (zh) * 2020-01-07 2021-06-25 李红 一种家用多功能吊扇

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE958147C (de) * 1955-05-01 1957-02-14 Siemens Ag Schaufelrad fuer Geblaese, insbesondere fuer Staubsauger
GB8611643D0 (en) * 1986-05-13 1986-06-18 Sauter R J Centrifugal impellers
JPH0460196A (ja) * 1990-06-29 1992-02-26 Matsushita Electric Ind Co Ltd 電動送風機
JP3617095B2 (ja) * 1995-01-18 2005-02-02 松下電器産業株式会社 電動送風機
JP2001032792A (ja) * 1999-07-21 2001-02-06 Matsushita Electric Ind Co Ltd 電動送風機及び電気掃除機
JP2006009669A (ja) * 2004-06-24 2006-01-12 Nidec Shibaura Corp 遠心式送風機
JP4556884B2 (ja) * 2006-03-01 2010-10-06 パナソニック株式会社 電動送風機

Also Published As

Publication number Publication date
EP1923572A2 (en) 2008-05-21
EP1923572A3 (en) 2010-10-20
CN201037473Y (zh) 2008-03-19
JP2008121589A (ja) 2008-05-29
KR20080043684A (ko) 2008-05-19
CN100516546C (zh) 2009-07-22
JP4867596B2 (ja) 2012-02-01
KR101287250B1 (ko) 2013-07-17
CN101182851A (zh) 2008-05-21

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