US20160106280A1 - Vacuum attachment for a blower - Google Patents

Vacuum attachment for a blower Download PDF

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Publication number
US20160106280A1
US20160106280A1 US14/785,396 US201314785396A US2016106280A1 US 20160106280 A1 US20160106280 A1 US 20160106280A1 US 201314785396 A US201314785396 A US 201314785396A US 2016106280 A1 US2016106280 A1 US 2016106280A1
Authority
US
United States
Prior art keywords
channel
attachment
port
air
vacuum
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
US14/785,396
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English (en)
Inventor
Johan Hallendorff
Lucas Lund
Christoph Schiedt
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.)
Husqvarna AB
Original Assignee
Husqvarna AB
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 Husqvarna AB filed Critical Husqvarna AB
Assigned to HUSQVARNA AB reassignment HUSQVARNA AB ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: SCHIEDT, CHRISTOPH, HALLENDORFF, JOHAN, LUND, Lucas
Publication of US20160106280A1 publication Critical patent/US20160106280A1/en
Abandoned legal-status Critical Current

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Classifications

    • 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
    • A47L9/00—Details or accessories of suction cleaners, e.g. mechanical means for controlling the suction or for effecting pulsating action; Storing devices specially adapted to suction cleaners or parts thereof; Carrying-vehicles specially adapted for suction cleaners
    • A47L9/02—Nozzles
    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
    • A01G20/00—Cultivation of turf, lawn or the like; Apparatus or methods therefor
    • A01G20/40—Apparatus for cleaning the lawn or grass surface
    • A01G20/43—Apparatus for cleaning the lawn or grass surface for sweeping, collecting or disintegrating lawn debris
    • A01G20/47—Vacuum or blower devices
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01H—STREET CLEANING; CLEANING OF PERMANENT WAYS; CLEANING BEACHES; DISPERSING OR PREVENTING FOG IN GENERAL CLEANING STREET OR RAILWAY FURNITURE OR TUNNEL WALLS
    • E01H1/00—Removing undesirable matter from roads or like surfaces, with or without moistening of the surface
    • E01H1/08—Pneumatically dislodging or taking-up undesirable matter or small objects; Drying by heat only or by streams of gas; Cleaning by projecting abrasive particles
    • E01H1/0827—Dislodging by suction; Mechanical dislodging-cleaning apparatus with independent or dependent exhaust, e.g. dislodging-sweeping machines with independent suction nozzles ; Mechanical loosening devices working under vacuum
    • E01H1/0836—Apparatus dislodging all of the dirt by suction ; Suction nozzles
    • 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
    • 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
    • F04D29/4206—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for elastic fluid pumps

Definitions

  • This invention relates to a vacuum attachment for a blower, and to a related vacuum apparatus, the attachment and apparatus typically, but non-exclusively, being suitable for the collection of garden debris.
  • Garden vacuum apparatus generally comprise a source of low pressure arranged so as to draw debris into a collection channel and to deposit the debris into a collection chamber, such as a reusable fabric bag.
  • a source of low pressure is a rotary fan or other such impeller.
  • the function of such apparatus can be separated into two types: the first type can be referred to as a “dirty fan” system, where the debris passes over the fan between the collection channel and the collection chamber.
  • the debris can adhere to the fan, causing a potential reduction in performance.
  • Wet, sticky debris such as wet leaves can completely block the fan, meaning that a user has to remove the blockage from the fan manually.
  • Hard objects passing through the fan can impact on a blade of the fan, possibly breaking it.
  • the second type uses a flow of air to create an underpressure (in line with Bernoulli's principle, which states that a moving fluid will reduce in pressure) and to use that underpressure to provide suction.
  • an underpressure in line with Bernoulli's principle, which states that a moving fluid will reduce in pressure
  • Such a system is described in the Bulgarian Patent application published as P-2007/0092.
  • Such systems have the advantage that debris need not, and generally does not, pass over the fan.
  • a vacuum attachment for a blower comprising:
  • this provides for an attachment that can be attached onto a blower in order to provide a vacuum debris collection device.
  • a blower which can be used for when blowing of debris is required, and then convert it into a vacuum debris collection device when it is desired to collect debris.
  • all that is needed in order to convert the blower into a vacuum apparatus is to engage the air inlet of the vacuum attachment with the outlet of the blower; no complicated rebuilding of the blower is required, and the blower still operates on a “clean fan” basis.
  • the input air channel may comprise a shell surrounding at least a portion of the through channel, with the shell and the portion of the through channel typically being cylindrical and/or coaxial, although the through channel and the shell could also be oval, elliptical or rectangular/square with rounded corners in cross section.
  • the input air channel may comprise an input tube between the air inlet and the shell.
  • the input tube and the shell will typically have internal cross sectional areas, the internal cross sectional area of the input tube being less than the internal cross sectional area of the annulus formed between the shell and a portion of the through channel, the input air channel comprising a transition portion between the input tube and the shell, the transition portion having a cross sectional area smoothly varying from that of the input tube to that of the shell. This allows for a gradual decrease of the air velocity, so as to decrease the back pressure at the air inlet (and so on the fan of the blower).
  • the input tube may be any desired shape in cross-section, such as circular, oval, elliptical or rectangular/square with rounded corners.
  • the input air channel may change direction through the port, typically by more than 90, as may be measured along an outer surface of the input air channel.
  • the input air channel may change direction smoothly through the port; by smoothly, we may mean sufficiently smoothly so as not to create significant turbulence.
  • the port may have a radius of curvature r 1 (typically measured along the centreline of the port), which is greater than the width w of the exit of the port.
  • the through channel will typically have an inner circumference; the port may extend around at least three quarters of the circumference, and preferably around (substantially) the entire circumference. This has been found to provide a smoother airflow, and also means that the debris will preferentially be carried up the centre of the through channel, rather than being pressed against the side as with the case where the port is provided significantly asymmetrically around the through channel.
  • the collection container may comprise a bag formed of flexible material such as textile material, where the material allows the air flowing out of the inlet to escape but retains debris entrained in the air.
  • a perforated box or other such container which can be opened to empty debris.
  • the through channel will typically be straight, or at least substantially straight, from vacuum inlet to outlet, although it may widen towards the outlet. Having a (substantially) straight through channel means that less debris will impact the internal walls of the through channel and that longer objects, such as bottles or cans, may be vacuumed without any hindrance on their way through the through channel. Widening the through channel towards the outlet will give a better vacuum performance than if the through channel has the same width the whole way to the outlet. For example, if the cross-sectional area of the through channel increases 100%, the so-called outlet losses may be as much as 75% smaller than in the case of a through channel which does not widen at the outlet. Typically, where the channel widens, the angle of inclination of the internal walls of the through channel to a central axis of the through channel may be between 5 and 20 degrees.
  • the through channel has an internal diameter and the port is spaced at least half, or at least one internal diameter along the through channel from the vacuum inlet. This has been found to provide a stronger vacuum force, potentially because the distance between the inlet and the port allows air drawn in to be of smoother flow than if it were directly drawn in at the port.
  • the attachment may comprise a tail part extending between the port and the vacuum inlet, which may define part of the through channel, preferably over at least half if not one internal diameter of the through channel along the through channel.
  • This tail part has been found to be a particularly simple and light construction, as well as achieving the smoother flow discussed above.
  • the mounting surface may be shaped so as to provide a releasable engagement for the blower, such as a bayonet or screw engagement. Alternatively, it may provide a simple interference or friction engagement, a snap engagement or a clamp.
  • the attachment may be formed of two interengaging pieces, an insert and a channel member which defines part of the through channel, the insert and the channel member being held captive between the interengaging pieces and defining between them walls of the port, typically through the change of direction.
  • the insert may define the walls of the port on the outside of the change of direction and a leading edge of the channel member may form the walls of the port on the inside of the change of direction.
  • the channel member may define part of the through channel between the port and the outlet.
  • the insert may be provided with spacers which act to space the insert from the channel member, the spacers being shaped complementary to the leading edge.
  • the interengaging parts may be a threaded or screw engagement.
  • the channel member may be a tubular member, where the through channel is tubular.
  • the blower may be a back-mounted blower, which is typically worn on the back of a user in the manner of a backpack. This is more ergonomic than carrying the weight of an existing hand-held garden vacuum, particularly for professional users of such product.
  • a vacuum apparatus comprising a source of pressurised air, an input air channel having an air inlet coupled to the source, a through channel from a vacuum inlet to an outlet, in which the input air channel terminates in a port in the through channel, in which the port is positioned so as to direct air flowing from the input air channel in a direction through the through channel away from the vacuum inlet, in which the through channel has an inner circumference, and in which the port extends around at least three quarters of the circumference.
  • the port extends around the entire circumference.
  • the vacuum apparatus may have any of the optional features described above with reference to the first two aspects of the invention.
  • FIG. 2 shows a cross section through the vacuum attachment of FIG. 1 ;
  • FIG. 3 shows the vacuum attachment of FIG. 1 being used by a user
  • FIG. 4 shows an enlarged cross-section through the port of the attachment of FIG. 1 ;
  • FIG. 5 shows a cross-sectional perspective view of how the attachment of FIG. 1 is formed of three separate mouldings
  • FIG. 6 shows a simulation of the airflow through the attachment of FIG. 1 ;
  • FIG. 7 shows an exploded view of a vacuum attachment in accordance with a second embodiment of the invention.
  • FIG. 8 shows a cross-sectional perspective view of the vacuum attachment of FIG. 7 .
  • FIG. 1 to 5 A vacuum attachment 1 in accordance with a first embodiment of the invention is shown in FIG. 1 to 5 .
  • the attachment 1 comprises a moulded plastic body which forms a through channel 5 between a vacuum inlet 6 and an outlet 7 .
  • the through channel 5 is preferably cylindrical, but may also have other cross-sectional shapes, such as for example oval or elliptic.
  • the bore of this channel is generally straight, as air entrained with debris will pass through the through channel 5 , and it is preferably to leave as few obstacles as possible in the path of the debris.
  • the moulding forming the attachment also forms a further channel, the input air channel 3 .
  • This inlet tube 13 is preferably cylindrical, but may also have other cross-sectional shapes such as oval, elliptic, square.
  • the input air channel 3 continues through a transition portion 14 to a shell 11 surrounding a portion 12 of the through channel 5 .
  • the shell 11 preferably has the same shape as the through channel 5 , i.e. if the through channel 5 is cylindrical, the shell 11 has a cylindrical shape. Further, the shell 11 may surround the portion 12 in a coaxial manner.
  • the internal cross section A 1 of the inlet tube 13 is less than the internal cross section A 2 of the annulus created between the shell 11 and the portion 12 of the through channel 5 .
  • the internal cross section A 2 of the annulus is measured upstream of the port 8 , i.e. before the input air channel 3 starts narrowing.
  • the transition portion 14 smoothly increases in cross section between the inlet tube 13 and the shell 11 , and also shifts the input air channel 3 from the position of the input tube 13 , parallel to but offset from the through channel, to be wrapped coaxially around the shell 11 . Keeping this transition smooth improves performance by reducing turbulence and keeps the pressure drop across the attachment low, which has advantages set out below.
  • the input air channel 3 terminates in a port 8 where the input air channel enters the through channel 5 .
  • the cross section of the input air channel decreases as it approaches the port 8 , to cause an increase in the speed of the air flowing therethrough.
  • the airflow changes in direction by preferably at least approximately 135 degrees, so that air flowing through the port is ejected into the through channel 5 in the general direction of the outlet 7 .
  • the change in direction is smooth, in that the inner surface 16 of the port on the inside of the change of direction has a radius of curvature r 1 , which is greater than the width w of the exit of the port 8 .
  • the port shown in cross section in FIG. 4 of the accompanying drawings, extends around the internal circumference of the through channel 5 , as can be seen in the cut-away drawing shown in FIG. 5 of the accompanying drawings.
  • the through channel 5 extends away from the port in both directions; at least half an internal through-channel diameter in the case of a tail part 23 , which extends towards the vacuum inlet 6 .
  • the presence of the tail part 23 also gives a simpler and lighter construction than if the shell 11 and the portion 12 extended as far as the tail part 23 does.
  • the outlet 7 has fixing hooks 18 for a collection bag 15 .
  • the blower 2 will provide a stream of air to the inlet 4 .
  • This air does not yet have any debris entrained in it, and so the fan in the blower is a “clean” fan that does not need to be protected against such debris in the airstream.
  • the air will pass through the input air channel 3 , and pass out through the port 8 into the through channel 5 .
  • the structure of input air channel 3 gives an even distribution of the air at port 8 .
  • a moving airstream will cause a drop in the local air pressure, and so the moving airstream from the port 8 directed towards the outlet 7 will cause a drop in pressure at the vacuum inlet 6 . As such, air will be drawn into the vacuum inlet 6 .
  • the net result of the airflow from the blower being introduced into the air inlet 4 is therefore an airflow from the vacuum inlet 6 to the outlet 7 .
  • Debris 17 positioned near the vacuum inlet 6 will be entrained into the air flow, and will be carried through the through channel 5 and passed out the outlet 7 , where it can be collected in collection bag 15 . Debris therefore does not come into contact with the blower 2 at all.
  • the blower 2 can be a backpack-mounted blower, which allows part of the weight of the combination of blower 2 and attachment 1 to be taken on the user's back. This only leaves the relatively lightweight attachment 1 , and potentially the collection bag 15 , to be hand carried by the user. This is more ergonomic than in the prior art.
  • the presence of the through channel 5 continuing a significant distance upstream from the port 8 towards the vacuum inlet 6 through the tail part 23 acts to smooth the airflow through the through channel 5 and has been found to provide an improved and more consistent suction force than if that extension is not present.
  • FIG. 5 of the accompanying drawings shows how the attachment can conveniently be formed as three separate mouldings.
  • the first moulding 20 forms the through channel 5 downstream of the port 8 and so may include the outlet 7 . It also provides support fins 19 for the second moulding 21 .
  • the second moulding forms the input air channel 3 and is moulded over the first moulding 20 , such that the support fins support the second moulding over the first moulding so as to define part of the input channel 3 in the space between the shell 11 and the first moulding 20 .
  • the third moulding 22 is moulded such that it can be fit over the first two mouldings 20 , 21 , and provides the through channel 5 upstream of the port 8 and so includes the vacuum inlet 6 .
  • the second moulding 21 prefferably be an airtight fit over the first moulding 20 , so that the air flow from the input air channel 3 as it enters the shell smoothly flows towards the port 8 and does not reverse direction and cause turbulence and so hamper the vacuum effect.
  • FIGS. 7 and 8 of the accompanying drawings An attachment 51 in accordance with a second embodiment of the invention is shown in FIGS. 7 and 8 of the accompanying drawings.
  • features equivalent to those of the first embodiment described above have been given corresponding reference numerals, raised by 50.
  • the attachment 51 of the present embodiment is formed of several pieces as follows:
  • the tail part 80 and inlet part 83 may be screwed together or otherwise fixed to each other to hold the insert 81 and tubular member 82 captive between them.
  • the insert 81 and the tubular member 82 define the walls of the port 58 , with the tubular member 82 providing the walls on the inside of the bend in the airflow through the port 58 and the insert 81 providing the outside walls.
  • the insert 81 is provided with wings 85 which space the insert 81 from the tubular member 82 .
  • the wings are shaped so as to be complementary to the curved leading edge 86 of the tubular member (that is, the edge that provides the inner wall of the port 58 ).
  • the shape of the wings therefore assists in keeping the tubular member 82 coaxial with the insert 81 and with the inlet part 83 .
  • the tail part 80 will not be able to be screwed onto the inlet part 83 correctly, and so it will be apparent to the assembler that the parts are not correctly aligned. This may improve the accuracy with which the device is assembled, as it will be apparent when it is not correctly assembled.
  • the support fins 19 of the previous embodiment are no longer required.
  • insert 81 could, in an alternative embodiment, be made integral with the tail part 80 , as those parts need not be separable.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Environmental Sciences (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Jet Pumps And Other Pumps (AREA)
  • Cleaning Of Streets, Tracks, Or Beaches (AREA)
US14/785,396 2013-04-22 2013-04-22 Vacuum attachment for a blower Abandoned US20160106280A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/SE2013/050430 WO2014175789A1 (fr) 2013-04-22 2013-04-22 Accessoire d'aspiration destiné à un ventilateur

Publications (1)

Publication Number Publication Date
US20160106280A1 true US20160106280A1 (en) 2016-04-21

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ID=51792199

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Application Number Title Priority Date Filing Date
US14/785,396 Abandoned US20160106280A1 (en) 2013-04-22 2013-04-22 Vacuum attachment for a blower

Country Status (5)

Country Link
US (1) US20160106280A1 (fr)
EP (1) EP2989256A4 (fr)
JP (1) JP2016524671A (fr)
CN (1) CN105143557B (fr)
WO (1) WO2014175789A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USD1003551S1 (en) * 2023-07-06 2023-10-31 Dongguan le selling Trade Co. Ltd. Air nozzle for a leaf blower
USD1122549S1 (en) * 2023-12-05 2026-04-14 Bryce Allen Nozzle attachment extension for a vacuum cleaner hose

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107084155A (zh) * 2016-02-16 2017-08-22 创科（澳门离岸商业服务）有限公司 具有侧面开口的吹风管
JP6120469B1 (ja) * 2016-09-21 2017-04-26 株式会社テクノス 真空ポンプの寿命を延ばす運用方法
CN107022969B (zh) * 2017-05-22 2019-01-11 王玲斌 一种吸尘装置
RU2742916C1 (ru) * 2018-03-15 2021-02-11 Сименс Мобилити Гмбх Смеситель и схема для кондиционирования воздуха в рельсовом транспортном средстве
CN110528438B (zh) * 2019-09-12 2020-10-16 永康市创威电动工具制造有限公司 绿化落叶清扫装置
JP7560370B2 (ja) * 2021-01-27 2024-10-02 株式会社やまびこ 手持ち式電動バキューム
CN115198684A (zh) 2021-04-14 2022-10-18 创科无线普通合伙 吹吸装置

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US4817230A (en) * 1984-07-11 1989-04-04 Komatsu Zenoah Co. Dust collector
EP0501675A1 (fr) * 1991-02-25 1992-09-02 Electrolux Northern Limited Dispositif collecteur
GB2311462A (en) * 1996-03-28 1997-10-01 Black & Decker Inc Blower vacuum
US20120279010A1 (en) * 2009-08-27 2012-11-08 Rainer Kenter Handheld floor treatment device
US20130298351A1 (en) * 2012-05-11 2013-11-14 Franco Romito Attachment for air blower

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GB2152362B (en) * 1984-01-06 1987-08-19 C L Products Suction cleaning apparatus
GB9409909D0 (en) * 1994-05-18 1994-07-06 Black & Decker Inc Blower vacuum
GB9502682D0 (en) * 1995-02-11 1995-03-29 Black & Decker Inc Improvements relating to debris collecting apparatus
US5638574A (en) 1995-07-21 1997-06-17 Wci Outdoor Products, Inc. Convertible leaf blower and vacuum
US5722111A (en) * 1996-07-26 1998-03-03 Ryobi North America Blower vacuum
JP3827055B2 (ja) * 2000-01-04 2006-09-27 株式会社丸山製作所 携帯式送風機
CN2584660Y (zh) * 2002-12-11 2003-11-05 侯学志 道路真空吸尘与空气净化车
CA2452291A1 (fr) * 2003-12-31 2005-06-30 Soheyl Mottahedeh Collecte de feuilles dans des sacs perfores prets a porter pour aspirateurs-souffleurs
CN101356319B (zh) * 2006-02-28 2011-06-15 维克多草坪护理股份有限公司 可移动的具有鼓风和真空抽吸功能的装置
RS20070092A (sr) 2007-03-07 2008-11-28 Radivoje Mirković Čistač smeća

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4817230A (en) * 1984-07-11 1989-04-04 Komatsu Zenoah Co. Dust collector
EP0501675A1 (fr) * 1991-02-25 1992-09-02 Electrolux Northern Limited Dispositif collecteur
GB2311462A (en) * 1996-03-28 1997-10-01 Black & Decker Inc Blower vacuum
US20120279010A1 (en) * 2009-08-27 2012-11-08 Rainer Kenter Handheld floor treatment device
US20130298351A1 (en) * 2012-05-11 2013-11-14 Franco Romito Attachment for air blower

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USD1003551S1 (en) * 2023-07-06 2023-10-31 Dongguan le selling Trade Co. Ltd. Air nozzle for a leaf blower
USD1122549S1 (en) * 2023-12-05 2026-04-14 Bryce Allen Nozzle attachment extension for a vacuum cleaner hose

Also Published As

Publication number Publication date
CN105143557B (zh) 2018-06-12
CN105143557A (zh) 2015-12-09
EP2989256A1 (fr) 2016-03-02
JP2016524671A (ja) 2016-08-18
EP2989256A4 (fr) 2017-01-04
WO2014175789A1 (fr) 2014-10-30

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