WO2006043831A1 - A device of a suction mouth piece - Google Patents

A device of a suction mouth piece Download PDF

Info

Publication number
WO2006043831A1
WO2006043831A1 PCT/NO2005/000400 NO2005000400W WO2006043831A1 WO 2006043831 A1 WO2006043831 A1 WO 2006043831A1 NO 2005000400 W NO2005000400 W NO 2005000400W WO 2006043831 A1 WO2006043831 A1 WO 2006043831A1
Authority
WO
WIPO (PCT)
Prior art keywords
side channel
extraction duct
mouth piece
inlet slot
suction mouth
Prior art date
Application number
PCT/NO2005/000400
Other languages
French (fr)
Inventor
Odd Arvid Johansen
Original Assignee
Odd Arvid Johansen
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 Odd Arvid Johansen filed Critical Odd Arvid Johansen
Publication of WO2006043831A1 publication Critical patent/WO2006043831A1/en

Links

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

Definitions

  • This invention regards a suction mouth piece. More particularly, it regards a suction mouth piece comprising an extraction duct and at least one side channel projecting from the extraction duct.
  • the side channel is provided with an elongated inlet slot, where the inlet slot is arranged tangentially relative to the cross section of the side channel.
  • the device of the invention is especially suited for use as a suction mouth piece or nozzle on a vacuum cleaner.
  • the description below generally uses air as the fluid flowing through the suction mouth piece.
  • the operation of the suction mouth piece is not limited to air, as it may be used for any fluid, such as a combination of water and air.
  • a prior art suction mouth piece typically for use with a vacuum cleaner, is normally designed with an extraction duct and two diametrically opposed side channels projecting outwards from the extraction duct.
  • the side channels have an elongated opening or slot through which air is drawn in with the purpose of entraining particles from e.g. a floor to be cleaned.
  • JP patent 4 272 730 regards an impeller shaped suction mouth piece in which a plurality of side channels curved in the direction of the direction of flow lead tangentially into an extraction duct. Thus a rotating flow pattern is imparted to the air flowing out through the extraction duct.
  • the performance of the device of the JP publication is believed to be somewhat better than that of conventional suction mouth pieces, however it is relatively space-requiring and not particularly well suited for use in houses.
  • the object of the invention is to remedy or reduce at least one of the disadvantages of prior art.
  • the invention is implemented by providing a suction mouth piece which comprises an extraction duct and at least one side channel projecting from the extraction duct, with an inlet slot arranged tangentially relative to the cross section of the side channel. This imparts a rotary flow pattern to air that is drawn into the side channel through the inlet slot.
  • the efficiency of the suction mouth piece is improved further in that the extraction duct upstream is provided with a smaller flow area than at its outlet. During flow, a vortex- like flow usually arises, helping to impart a rotary flow pattern to the fluid flowing through the extraction duct.
  • the cross section of the extraction duct at least over part of the length of the extraction duct, constitutes a cone.
  • the side channel is connected to the extraction duct in a substantially tangential manner in order to further enhance the rotation of the air in the extraction duct.
  • Figure 1 is a perspective view of a suction mouth piece according to the invention, where the flow of air is indicated by helical dashed arrows;
  • Figure 2 is a perspective view of the same as figure 1, but showing a longitudinal section through a side channel;
  • Figure 3 shows a section A-A through figure 1;
  • Figure 4 shows a section B-B through figure 1.
  • reference number 1 denotes a suction mouth piece made from an appropriate material such as a light alloy, wherein an extraction duct 4 is provided in the central part 2 of the suction mouth piece, with a first side arm 6 and a second side arm 8 projecting from the central part 2 in diametrically opposed directions.
  • the extraction duct 4 is arranged to be connected to a vacuum cleaner (not shown) .
  • the first side arm 6 has a first side channel 10, while the second side arm 8 has a second side channel 12.
  • the side arms 6, 8 are formed with a contact surface 14 arranged to bear against a surface (not shown) to be cleaned.
  • the lower portion of the extraction duct 4 is formed with an inlet 16 having a smaller diameter than that of the extraction duct 4 outlet.
  • the lower portion of the extraction duct 4 from the inlet 16 has been given a conical shape, see figure 3.
  • the smaller diameter of the inlet 16, relative to the diameter of the rest of the extraction duct 4, ensures that a desired volume of air is drawn into the extraction duct 4 from the side channels 10 and 12, and also the creation of a vortex-like rotating flow in the inlet 16.
  • the side channels 10 and 12 lead tangentially into the extraction duct 4, see figures 2 and 3, with the purpose of further enhancing the rotation in the extraction duct 4.
  • Figure 4 shows the shape of the first side channel 10 in the first side arm 6.
  • An inlet slot 18 running along the side channel 10 is arranged tangentially relative to the cross section of the side channel 10. This design helps to ensure that the air which is drawn in via inlet slot 18, starts to rotate in the first side channel 10, as shown by the dashed arrows in figure 4.
  • the second side channel 12 is provided with an inlet slot 18.
  • the suction mouth piece 1 may be provided with brushes (not shown) that are known per se.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Nozzles For Electric Vacuum Cleaners (AREA)
  • Catching Or Destruction (AREA)

Abstract

A suction mouth piece device (1) comprising an extraction duct (4) and at least one side channel (10, 12) projecting outwards from the extraction duct (4), where the side channel (10, 12) is provided with an elongated inlet slot (18), and where the inlet slot (18) is arranged tangentially relative to the cross section of the side channel (10, 12) , whereby fluid that is drawn into the side channel (10, 12) through the inlet slot (18) assumes a rotating flow pattern.

Description

A DEVICE OF A SUCTION MOUTH PIECE
This invention regards a suction mouth piece. More particularly, it regards a suction mouth piece comprising an extraction duct and at least one side channel projecting from the extraction duct. The side channel is provided with an elongated inlet slot, where the inlet slot is arranged tangentially relative to the cross section of the side channel. Thus a rotating flow pattern is imparted to fluid flowing into the side channel through the inlet slot. The device of the invention is especially suited for use as a suction mouth piece or nozzle on a vacuum cleaner.
The description below generally uses air as the fluid flowing through the suction mouth piece. However, the operation of the suction mouth piece is not limited to air, as it may be used for any fluid, such as a combination of water and air.
A prior art suction mouth piece, typically for use with a vacuum cleaner, is normally designed with an extraction duct and two diametrically opposed side channels projecting outwards from the extraction duct. The side channels have an elongated opening or slot through which air is drawn in with the purpose of entraining particles from e.g. a floor to be cleaned.
In the case of particle transport in a flowing gas it is essential to maintain a high flow velocity to prevent the particles from falling out of the air flow. In the case of prior art mouth pieces, especially in industrial applications where the length of the mouth piece may exceed one metre, the power required to achieve a satisfactory cleaning result is relatively high.
It is well known that a fluid which assumes a rotary flow pattern during flow in a duct has a greater relative velocity than fluid flowing in a straight line along the same duct, given an equal flow rate.
Thus JP patent 4 272 730 regards an impeller shaped suction mouth piece in which a plurality of side channels curved in the direction of the direction of flow lead tangentially into an extraction duct. Thus a rotating flow pattern is imparted to the air flowing out through the extraction duct. The performance of the device of the JP publication is believed to be somewhat better than that of conventional suction mouth pieces, however it is relatively space-requiring and not particularly well suited for use in houses.
The object of the invention is to remedy or reduce at least one of the disadvantages of prior art.
The object is achieved in accordance with the invention, by the characteristics stated in the description below and in the following claims.
The invention is implemented by providing a suction mouth piece which comprises an extraction duct and at least one side channel projecting from the extraction duct, with an inlet slot arranged tangentially relative to the cross section of the side channel. This imparts a rotary flow pattern to air that is drawn into the side channel through the inlet slot.
The efficiency of the suction mouth piece is improved further in that the extraction duct upstream is provided with a smaller flow area than at its outlet. During flow, a vortex- like flow usually arises, helping to impart a rotary flow pattern to the fluid flowing through the extraction duct.
It is further preferable that the cross section of the extraction duct, at least over part of the length of the extraction duct, constitutes a cone.
Most preferably the side channel is connected to the extraction duct in a substantially tangential manner in order to further enhance the rotation of the air in the extraction duct.
When the rotation of the air stream, and with this the relative velocity of the air, increases, particles flowing into the mouth piece along with the air will to a much greater extent be kept suspended in the air, compared with prior art. In particular, this applies to the side channel of the mouth piece, with experiments showing that the motor power may be reduced by as much as 50% while maintaining a similar cleaning effect. The comparison has been carried out using previously known suction mouth pieces.
The following describes a non-limiting example of a preferred embodiment illustrated in the accompanying drawings, in which: Figure 1 is a perspective view of a suction mouth piece according to the invention, where the flow of air is indicated by helical dashed arrows;
Figure 2 is a perspective view of the same as figure 1, but showing a longitudinal section through a side channel;
Figure 3 shows a section A-A through figure 1; and
Figure 4 shows a section B-B through figure 1.
In the drawings, reference number 1 denotes a suction mouth piece made from an appropriate material such as a light alloy, wherein an extraction duct 4 is provided in the central part 2 of the suction mouth piece, with a first side arm 6 and a second side arm 8 projecting from the central part 2 in diametrically opposed directions. The extraction duct 4 is arranged to be connected to a vacuum cleaner (not shown) .
The first side arm 6 has a first side channel 10, while the second side arm 8 has a second side channel 12.
The side arms 6, 8 are formed with a contact surface 14 arranged to bear against a surface (not shown) to be cleaned.
The lower portion of the extraction duct 4 is formed with an inlet 16 having a smaller diameter than that of the extraction duct 4 outlet. The lower portion of the extraction duct 4 from the inlet 16 has been given a conical shape, see figure 3.
The smaller diameter of the inlet 16, relative to the diameter of the rest of the extraction duct 4, ensures that a desired volume of air is drawn into the extraction duct 4 from the side channels 10 and 12, and also the creation of a vortex-like rotating flow in the inlet 16.
The side channels 10 and 12 lead tangentially into the extraction duct 4, see figures 2 and 3, with the purpose of further enhancing the rotation in the extraction duct 4.
Figure 4 shows the shape of the first side channel 10 in the first side arm 6. An inlet slot 18 running along the side channel 10 is arranged tangentially relative to the cross section of the side channel 10. This design helps to ensure that the air which is drawn in via inlet slot 18, starts to rotate in the first side channel 10, as shown by the dashed arrows in figure 4.
Similarly, the second side channel 12 is provided with an inlet slot 18.
The suction mouth piece 1 may be provided with brushes (not shown) that are known per se.

Claims

C l a i m s
1. A device of a suction mouth piece (1) comprising an extraction duct (4) and at least one side channel (10, 12) projecting outwards from the extraction duct (4) , where the side channel (10, 12) is provided with an elongated inlet slot (18) , c h a r a c t e r i z e d i n that the inlet slot (18) is arranged tangentially relative to the cross section of the side channel (10, 12), the inlet slot (18) being located between a generally vertical edge and a bulb projecting outwards to the vertical centre line of the side channel (10, 12), whereby fluid that is drawn into the side channel (10, 12) through the inlet slot (18) assumes a rotating flow pattern in the side channel (10, 12) , and where the outlet from the side channel (10, 12) is connected substantially tangential to the extraction duct (4) .
2. A device according to Claim 1, c h a r a c t e r i z e d i n that the upstream end of the extraction duct (4) has an inlet (16) with a smaller cross sectional area than that of the extraction duct (4) outlet.
3. A device according to Claim 2 , c h a r a c t e r i z e d i n that the cross section of the extraction duct (4) at least over a portion of the length of the extraction duct (4) is formed by a cone.
4. A device according to one or more of Claims 1 to 4, c h a r a c t e r i z e d i n that the extraction duct (4) and the at least one side channel (10, 12) form a mouth piece (1) for a vacuum cleaner.
PCT/NO2005/000400 2004-10-22 2005-10-24 A device of a suction mouth piece WO2006043831A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NO20044535A NO20044535L (en) 2004-10-22 2004-10-22 Device at suction nozzle
NO20044535 2004-10-22

Publications (1)

Publication Number Publication Date
WO2006043831A1 true WO2006043831A1 (en) 2006-04-27

Family

ID=35057724

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/NO2005/000400 WO2006043831A1 (en) 2004-10-22 2005-10-24 A device of a suction mouth piece

Country Status (2)

Country Link
NO (1) NO20044535L (en)
WO (1) WO2006043831A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2018086299A (en) * 2014-01-29 2018-06-07 アイリスオーヤマ株式会社 Suction port body and vacuum cleaner

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0728434A1 (en) * 1994-09-14 1996-08-28 Hitachi, Ltd. Cleaner and cleaning method
EP0815787A1 (en) * 1995-03-15 1998-01-07 Hitachi, Ltd. Vacuum cleaner and suction piece therefor

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0728434A1 (en) * 1994-09-14 1996-08-28 Hitachi, Ltd. Cleaner and cleaning method
EP0815787A1 (en) * 1995-03-15 1998-01-07 Hitachi, Ltd. Vacuum cleaner and suction piece therefor

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2018086299A (en) * 2014-01-29 2018-06-07 アイリスオーヤマ株式会社 Suction port body and vacuum cleaner

Also Published As

Publication number Publication date
NO20044535L (en) 2006-04-24
NO20044535D0 (en) 2004-10-22

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