EP2076677B1 - Tragbare blas-/saugvorrichtung - Google Patents

Tragbare blas-/saugvorrichtung Download PDF

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Publication number
EP2076677B1
EP2076677B1 EP06821745A EP06821745A EP2076677B1 EP 2076677 B1 EP2076677 B1 EP 2076677B1 EP 06821745 A EP06821745 A EP 06821745A EP 06821745 A EP06821745 A EP 06821745A EP 2076677 B1 EP2076677 B1 EP 2076677B1
Authority
EP
European Patent Office
Prior art keywords
opening
housing
engine
blower
vents
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP06821745A
Other languages
English (en)
French (fr)
Other versions
EP2076677A1 (de
Inventor
Nicola Cerreto
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.)
Emak SpA
Original Assignee
Emak SpA
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Filing date
Publication date
Application filed by Emak SpA filed Critical Emak SpA
Publication of EP2076677A1 publication Critical patent/EP2076677A1/de
Application granted granted Critical
Publication of EP2076677B1 publication Critical patent/EP2076677B1/de
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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
    • 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
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L5/00—Structural features of suction cleaners
    • A47L5/12—Structural features of suction cleaners with power-driven air-pumps or air-compressors, e.g. driven by motor vehicle engine vacuum
    • A47L5/14—Structural features of suction cleaners with power-driven air-pumps or air-compressors, e.g. driven by motor vehicle engine vacuum cleaning by blowing-off, also combined with suction cleaning
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L5/00—Structural features of suction cleaners
    • A47L5/12—Structural features of suction cleaners with power-driven air-pumps or air-compressors, e.g. driven by motor vehicle engine vacuum
    • A47L5/22—Structural features of suction cleaners with power-driven air-pumps or air-compressors, e.g. driven by motor vehicle engine vacuum with rotary fans
    • 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
    • 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

Definitions

  • the invention relates to a portable blower/aspirator device.
  • portable blowers are generally powered by a two-stroke internal combustion engine located internally of a small housing in order to reduce the overall space occupied.
  • engines especially internal combustion engines, reach high temperatures which over time lead to rapid wear of the components thereof, which if they exceed a certain temperature threshold can be irredeemably damaged.
  • the prior art includes engine air-cooling systems which enable use of the cooling air to supply the blower.
  • the cooling air is at an excessive temperature and the engine group reaches temperatures which disturb the operator.
  • US 6,116,864 describes a vacuum/blower device that uses a first fan, a venting wheel, keyed on the engine drive shaft, which forces cold air coming from the external atmosphere into a cavity where the motor is housed, in order to cool the engine as the air passes. After having removed a part of the heat from the engine the air is expelled from the cavity by a second fan, a blower wheel, which exhibits two opposite pluralities of vanes positioned on a same circular wall afforded radially about the hub.
  • the blower wheel is keyed to the opposite end of the drive shaft.
  • the blower wheel exhibits a first plurality of vanes located on one end face and a second plurality of vanes located on the other end face of a wall interposed between the two pluralities of vanes and constituting the blower wheel.
  • the first plurality of vanes sucks in axially, through an opening, the hot air coming from the engine housing, while the second plurality of vanes axially sucks in air coming from the outside, which air then mixes with the hot air in the peripheral annular portion of the blower spiral, internally of which the blower wheel is located, before being blown through the blower tube.
  • This cooling system provides a vacuum/blower device which is compact, efficient and which exhibits no drawbacks deriving from too-high temperatures.
  • the ratio between the hot-air inlet opening dimensions into the blower wheel and the dimensions of the central wall of the blower wheel has to fall within a predetermined range in order to prevent the flow of air pumped by the second plurality of vanes from obstructing the flow of the cooling air.
  • the aim of the present invention is to provide a portable blower/aspirator device having structural and functional characteristics which are such as to satisfy the above-mentioned requirements, while at the same time obviating the drawbacks identified in the prior art.
  • 1 denotes in its entirety a portable blower/aspirator device according to the present invention.
  • the blower/aspirator device 1 comprises a housing 2 affording a cavity 2a internally of which a two-stroke internal combustion engine 3 is housed.
  • the engine 3 comprises a piston 4 guided internally of a cylinder 5 which powers, by means of a con rod 6, a crankshaft 7, supported by a pair of bearings 8.
  • a conical first fan, or cooling fan 9 is keyed to an end 7' of the crankshaft 7.
  • the cooling fan 9 is positioned in such a way as to be able to send fresh air from the outside towards the inside of the housing 2, so that the air can reach the cooling fins of the engine 3.
  • a second fan, or blower impeller 20 is fixed at the opposite end 7" of the crankshaft 7, which blower impeller 20 rotates internally of a volute 11 located laterally of the housing 2 and communicating there-with through a circular opening 12.
  • the opening 12 is afforded in a wall which is shared by the housing 2 and an internal radial face 11 a of the volute 11.
  • a further circular opening 13 is afforded on the external radial face 11 b of the volute 11, opposite the internal radial face 11a affording the opening 12; the circular opening 13, at which a grid 14 is mounted, communicates with the external environment.
  • the radius of the opening 12 facing the cavity 2a of the housing 2 is smaller than the radius of the opening 13 facing the external environment.
  • a blower tube (not illustrated) is fixed to the volute 11, which tube exits the volute 11 tangentially, and through which air is blown by the blower impeller 20 when the device 1 is operated as a blower.
  • the blower impeller 20 exhibits a wall 22 located perpendicular to the rotation axis of the crankshaft 7; a vane group constituted by a plurality of identical curved blades 21 is located on the side of the wall 22 facing the opening 13 communicating with the external environment ( figure 2 ).
  • the side of the wall 22 having the vane group faces the opening 13 communicating with the outside, while the opposite side of the wall 22 without the vane group faces towards the opening 12 that communicates with the cavity 2a of the housing 2.
  • the blades 21 develop radially and curvingly from the hub 23, and reach up to the external most circular edge of the wall 22.
  • Vents 24 are afforded in a circular arrangement on the wall 22 in proximity of the hub 23, each of which vents 24 is interposed between two blades 21.
  • vents 24 are fashioned by a quadrangular cut on a portion of wall 22 which has been deformed in proximity of the hub 23 so as to form a capping crown 25 in which the top faces towards the blade side, as is clearly visible in the section view in figure 3 .
  • vents 24 are cut on the most external circular lateral edge of the crown which rises from the base of the wall 22 and is arranged almost radially.
  • vents 24 place the side of the wall 22 bearing the vane group in communication with the opposite side which bears no vanes, and allow the hot air coming from the cavity 2a of the housing 2, where the engine 3 is housed, to pass into the volute 11, as will be described in more detail herein below.
  • the vents 24 are situated at the opening 12 in a position in proximity of the circular edge formed by the opening 12 ( figure 1 ).
  • the fan 9 sends cool air internally of the cavity 2a of the housing 2 where the engine 3 is housed.
  • the air cools the engine 3 and in turn heats up.
  • the air thus heated by the engine 3 is aspirated by the impeller 20 through the opening 12, located axially, thanks to the presence of the vents 24 which enable the air to reach the blades 21 which are present only on the opposite side to the side facing the opening 12 for intake of the hot air.
  • the impeller 20 by means of the blades 21, sucks in cool air from the outside through the axially-located opening 13 which is opposite the opening 12.
  • the cool air coming from the outside through the opening 13 and the hot air coming from the housing 2 through the opening 12 and then passed through the vents 24 are mixed together in the space comprised between two adjacent blades 21 thus forming a mixture which is blown radially and expelled through the blower tube.
  • the difference in pressure at the vents must be sufficient to enable the hot air to pass through the vents.
  • vents 24 on the crown portion of the wall 22 facilitates passage of hot air in order for the hot air to reach the blades 21 arranged on the other side of the wall 22.
  • the pressure in proximity of the vents 24 on the side facing the opening 12 communicating with the housing 2 must be higher than the pressure in proximity of the vents 24 on the side facing the opening 13 communicating with the outside.
  • the side of the wall 22 bearing the vane group is constantly under a depression with respect to the side facing the opening 12.
  • This depression is a function of the diameter of the circle on which the vents 24 lie and the diameter of the openings 12 and 13.
  • the depression measured is about 30mm of water gauge.
  • the size of the impeller 20 and therefore of the blades 21 and the vents 24 must be decided such that they can operate with the side of the wall 22 bearing the blades at a lower pressure than the opposite side, in order to enable aspiration of the hot air coming from the engine 3 housing 2.
  • the portable blower/aspirator device of the invention satisfies the needs and obviates the drawbacks outlined in the introductory part of the present description in reference to the prior art.
  • blower/aspirator device of the invention enables the engine to be cooled during its normal operation, as well as providing a blown air flow which is at a conveniently low temperature.

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)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
  • External Artificial Organs (AREA)

Claims (7)

  1. Ein tragbarer Bläser/Sauger Gerät 1, einschließlich:
    - einem Gehäuse (2) mit einem Hohlraum (2a);
    - einem Motor (3), der in dem Hohlraum (2a) des Gehäuses (2) eingesetzt ist, wobei der Motor (3) mit einer Antriebswelle (7) ausgestattet ist;
    - einem Kühlgebläse (9), das an ein Ende (7') der Antriebswelle (7) gespannt ist, um Kühlluft von außen einzusaugen und die Kühlluft in das Gehäuse (2) zu leiten;
    - einem Gebläserad (20), das an das andere Ende (7") der Antriebswelle (7) gespannt ist, welches dem Ende (7') gegenüberliegt, und das in einem Verdichtergehäuse (11) liegt;
    Das Verdichtergehäuse (11) steht dabei auf einer Seite durch eine erste Öffnung (12) mit dem Gehäuse (2) des Motors (3) und auf der gegenüberliegenden Seite durch eine zweite Öffnung (13) mit der Außenumgebung in Verbindung,
    dadurch gekennzeichnet, dass
    das Gebläserad (20) eine Wand (22) mit einschließt, welche der ersten Öffnung (12) gegenübersteht, sowie eine Reihe an radial angeordneten Klingen (21), welche der zweiten Öffnung (13) gegenüberstehen und einen kreisförmigen Bereich um ein Zentrum (23), wobei der kreisförmige Bereich mit Entlüftungsschlitzen (24) versehen ist und sich vor der ersten Öffnung (12) befindet.
  2. Das Gerät (1) nach Patentanspruch 1, bei dem die Klingen (21) eine gewölbte Form aufweisen.
  3. Das Gerät (1) nach Patentanspruch 1, bei dem sich die Klingen (21) vom Zentrum aus (23) bewegen und zu dem äußeren, größtenteils kreisrunden Ende der Wand (22) gelangen.
  4. Das Gerät (1) nach Patentanspruch 1, bei dem der kreisförmige Bereich um das Zentrum (23) eine deckelförmige Krone (25) ist. Die Entlüftungsschlitze (24) sind dabei an dem äußersten seitlichen Ende des Kronen-Bereichs und nahezu radial angeordnet.
  5. Das Gerät (1) nach Patentanspruch 1, bei dem die Entlüftungsschlitze (24) viereckig geschnitten sind.
  6. Das Gerät (1) nach Patentanspruch 4, bei dem die erste Öffnung (12) und die zweite Öffnung (13) eine kreisrunde Form aufweisen, wobei der Radius der ersten Öffnung (12) kleiner ist als der Radius der zweiten Öffnung (13).
  7. Das Gerät (1) nach Patentanspruch 6, bei dem der Kronenbereich der Wand (22) einen Radius aufweist, der dem Radius der ersten Öffnung (12) entspricht.
EP06821745A 2006-10-26 2006-10-26 Tragbare blas-/saugvorrichtung Active EP2076677B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/IT2006/000755 WO2008050358A1 (en) 2006-10-26 2006-10-26 A portable blower/aspirator device

Publications (2)

Publication Number Publication Date
EP2076677A1 EP2076677A1 (de) 2009-07-08
EP2076677B1 true EP2076677B1 (de) 2010-01-06

Family

ID=38117711

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06821745A Active EP2076677B1 (de) 2006-10-26 2006-10-26 Tragbare blas-/saugvorrichtung

Country Status (4)

Country Link
EP (1) EP2076677B1 (de)
AT (1) ATE454557T1 (de)
DE (1) DE602006011660D1 (de)
WO (1) WO2008050358A1 (de)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2576085Y2 (ja) * 1993-01-21 1998-07-09 株式会社共立 可搬式パワーブロワー
DE19701082B4 (de) * 1997-01-15 2012-03-15 Fa. Andreas Stihl Saug-/Blasgerät
DE19960906A1 (de) * 1999-12-17 2001-06-21 Stihl Maschf Andreas Luftgekühlter Verbrennungsmotor
JP4287261B2 (ja) * 2003-12-05 2009-07-01 本田技研工業株式会社 動力送風機

Also Published As

Publication number Publication date
ATE454557T1 (de) 2010-01-15
EP2076677A1 (de) 2009-07-08
WO2008050358A1 (en) 2008-05-02
DE602006011660D1 (de) 2010-02-25

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