EP1273256B1 - Vacuum cleaner - Google Patents
Vacuum cleaner Download PDFInfo
- Publication number
- EP1273256B1 EP1273256B1 EP02254643A EP02254643A EP1273256B1 EP 1273256 B1 EP1273256 B1 EP 1273256B1 EP 02254643 A EP02254643 A EP 02254643A EP 02254643 A EP02254643 A EP 02254643A EP 1273256 B1 EP1273256 B1 EP 1273256B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- impeller
- vacuum cleaner
- airflow path
- inlet
- duct
- 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 - Lifetime
Links
- 238000000926 separation method Methods 0.000 claims description 15
- 239000000428 dust Substances 0.000 claims description 11
- 239000000463 material Substances 0.000 claims description 5
- 238000011144 upstream manufacturing Methods 0.000 claims description 4
- 239000004743 Polypropylene Substances 0.000 claims description 3
- -1 polypropylene Polymers 0.000 claims description 3
- 229920001155 polypropylene Polymers 0.000 claims description 3
- 239000004794 expanded polystyrene Substances 0.000 claims description 2
- 238000000034 method Methods 0.000 claims description 2
- 239000007787 solid Substances 0.000 claims description 2
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Images
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
- 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
Definitions
- This invention relates to a vacuum cleaner having an increased suction power.
- vacuum cleaners incorporate a clean air fan system in which air is drawn through a separation unit comprising a filter bag and/or a cyclonic separator by a fan mounted downstream thereof.
- the separation unit removes substantially all of the dust entrained in the airflow and thus the air passing through the fan is substantially clean.
- the fan comprises a centrifugal radial flow impeller driven by an electric motor.
- the fan is arranged to draw air axially, out of a first chamber mounted in front of the impeller. The air is then driven radially by the impeller into a second chamber which is connected to the exhaust of the cleaner.
- a duct leads from the separation unit to the first chamber.
- GB341743 discloses a vacuum cleaner having an electric motor, a fan driven by the motor and a dust filter mounted in a common housing.
- EP0970651 discloses a vacuum cleaner having a suction unit at the front side of the main body and a dust collector and blower at the rear side. Another known vacuum cleaner is described in DE 196 16 156 C1 .
- Vacuum cleaners of the above mentioned type function extremely well. However, there is increasing demand to improve the suction power of vacuum cleaners without increasing the wattage of the motor.
- the fan chamber actually forms a part of the duct leading to the impeller.
- the increased cross-sectional area of the chamber causes the airflow entering the chamber to expand and drop in velocity. This expansion and drop in velocity causes the kinetic energy of the air molecules to drop as they enter the fan chamber. Accordingly, more power is required to move the air from the chamber.
- the chamber also causes a turbulent flow which further inhibits the airflow and causes noise.
- the present invention overcomes the above-mentioned problems by omitting the chamber and by communicating the air directly to the impeller through a duct having a substantially uniform cross-sectional area along a substantial part of its length.
- the area of said outlet end of the duct of the airflow path is substantially equal to the cross-sectional area of the inlet end of the central duct of the impeller.
- outlet end of the duct of the airflow path extends axially of the rotational axis of the impeller.
- outlet end of the duct of the airflow path is circular in cross-section.
- Conventional vacuum cleaners having a fan chamber can be modified in accordance with the present invention by providing an insert member in the chamber having a passageway therethrough forming a part of the duct of the airflow path.
- Claim 9 relates to a method of modifying a vacuum cleaner.
- the member comprises a solid body of material which fills the chamber apart from the passageway.
- the material comprises expanded polystyrene or polypropylene.
- the separation unit is preferably mounted in the airflow path upstream of the fan unit, the duct having an inlet end connected to the outlet of the separation unit.
- the fan assembly of an upright vacuum cleaner which assembly is arranged to draw air along an inlet duct 10 leading from a dust separation unit, such as a cyclonic separator and/or filter bag (not shown).
- a dust separation unit such as a cyclonic separator and/or filter bag (not shown).
- the output shaft 14 of the motor 13 is connected to an impeller 15 comprising a plurality of blades 16 extending radially with respect to the rotational axis of the motor shaft 14, between circular front and rear plates 18,28 of the impeller which lie normal to the rotational axis.
- the radially outer ends of the blades 16 terminate adjacent the inner surface of the cylindrical housing 11.
- the blades 16 extend outwardly from a central hollow region 17 which extends axially of the impeller 15.
- a circular aperture 29 is formed in the front plate of the impeller 15 to communicate with the central hollow region 17.
- a large cavity 19 is formed at one end of the housing 11 between the front plate 18 of the impeller 15 and an end wall of the housing 11.
- the inlet duct 10 from the separation unit leads tangentially into the cavity 19.
- the fan unit as hereinbefore described corresponds with that of a conventional vacuum cleaner.
- the impeller 15 is rotated about its axis to cause air to flow radially outwardly from its central region 17 through the blades 16 and then axially over the motor 13, whereupon the air leaves the housing 11 through an exhaust duct 21.
- the impeller 15 draws air axially into the central region 17 through the aperture 29 from the cavity 19, disposed on the opposite side of the impeller 15 to the motor 13: This creates a drop in pressure in the cavity 19 which causes air to flow from the atmosphere through the dust separation unit (not shown) and into the cavity 19, whereupon it is discharged to atmosphere through the impeller 15 and exhaust 21 as hereinbefore described.
- the cavity 19 is filled by a cylindrical insert 20 of expanded polypropylene material.
- An involuted through passage 22 extends through the insert 20, with one end of the passage 22 extending axially to communicate directly with the tangential inlet duct 10 from the outlet of the separation unit and the other end extending axially to communicate directly with the aperture 29 in the front plate 18 of the impeller 15: preferably this end of the passage 22 is circular in cross-section and has a diameter which is substantially equal to the diameter of the aperture 29 in the front plate 18 of the impeller 15.
- the insert 20 effectively fills the cavity 19, so as to maintain a substantially uniform cross-sectional area to the airflow path leading from the dust separation unit. We have found that this surprisingly increases the suction power.
- the present invention solves the above-mentioned problem by effectively replacing the chamber 19 with a passageway 22 having a cross-sectional area which is substantially equal to the cross-sectional area of the duct 10 and the area of the aperture 29 in the front plate 18 of the impeller 15.
Abstract
Description
- This invention relates to a vacuum cleaner having an increased suction power.
- Typically vacuum cleaners incorporate a clean air fan system in which air is drawn through a separation unit comprising a filter bag and/or a cyclonic separator by a fan mounted downstream thereof. The separation unit removes substantially all of the dust entrained in the airflow and thus the air passing through the fan is substantially clean.
- Typically the fan comprises a centrifugal radial flow impeller driven by an electric motor. The fan is arranged to draw air axially, out of a first chamber mounted in front of the impeller. The air is then driven radially by the impeller into a second chamber which is connected to the exhaust of the cleaner. A duct leads from the separation unit to the first chamber.
-
GB341743 EP0970651 discloses a vacuum cleaner having a suction unit at the front side of the main body and a dust collector and blower at the rear side. Another known vacuum cleaner is described inDE 196 16 156 C1 . - Vacuum cleaners of the above mentioned type function extremely well. However, there is increasing demand to improve the suction power of vacuum cleaners without increasing the wattage of the motor.
- Thus, we have now devised a vacuum cleaner having an increased suction power compared with known vacuum cleaners having the same motor power.
- In accordance with this invention, there is provided a vacuum cleaner as set out in
claim 1. , - In conventional vacuum cleaners, the fan chamber actually forms a part of the duct leading to the impeller. We have realised that the increased cross-sectional area of the chamber causes the airflow entering the chamber to expand and drop in velocity. This expansion and drop in velocity causes the kinetic energy of the air molecules to drop as they enter the fan chamber. Accordingly, more power is required to move the air from the chamber. The chamber also causes a turbulent flow which further inhibits the airflow and causes noise.
- The present invention overcomes the above-mentioned problems by omitting the chamber and by communicating the air directly to the impeller through a duct having a substantially uniform cross-sectional area along a substantial part of its length.
- Preferably the area of said outlet end of the duct of the airflow path is substantially equal to the cross-sectional area of the inlet end of the central duct of the impeller.
- Preferably said outlet end of the duct of the airflow path extends axially of the rotational axis of the impeller.
- Preferably said outlet end of the duct of the airflow path is circular in cross-section.
- Conventional vacuum cleaners having a fan chamber can be modified in accordance with the present invention by providing an insert member in the chamber having a passageway therethrough forming a part of the duct of the airflow path.
- Claim 9 relates to a method of modifying a vacuum cleaner.
- Preferably the member comprises a solid body of material which fills the chamber apart from the passageway.
- Preferably the material comprises expanded polystyrene or polypropylene.
- In vacuum cleaners of the clean air type, the separation unit is preferably mounted in the airflow path upstream of the fan unit, the duct having an inlet end connected to the outlet of the separation unit.
- An embodiment of this invention will now be described by way of an example only and with reference to the accompanying drawings, in which:
-
Figure 1 is a sectional view through the fan assembly of an embodiment of vacuum cleaner in accordance with this invention; and -
Figure 2 is a sectional view along the line II - II ofFigure 1 . - Referring to the drawings, there is shown the fan assembly of an upright vacuum cleaner, which assembly is arranged to draw air along an
inlet duct 10 leading from a dust separation unit, such as a cyclonic separator and/or filter bag (not shown). - The
output shaft 14 of themotor 13 is connected to animpeller 15 comprising a plurality ofblades 16 extending radially with respect to the rotational axis of themotor shaft 14, between circular front andrear plates blades 16 terminate adjacent the inner surface of thecylindrical housing 11. Theblades 16 extend outwardly from a centralhollow region 17 which extends axially of theimpeller 15. Acircular aperture 29 is formed in the front plate of theimpeller 15 to communicate with the centralhollow region 17. - A
large cavity 19 is formed at one end of thehousing 11 between thefront plate 18 of theimpeller 15 and an end wall of thehousing 11. Theinlet duct 10 from the separation unit leads tangentially into thecavity 19. - The fan unit as hereinbefore described corresponds with that of a conventional vacuum cleaner. When the
motor 13 is energised, theimpeller 15 is rotated about its axis to cause air to flow radially outwardly from itscentral region 17 through theblades 16 and then axially over themotor 13, whereupon the air leaves thehousing 11 through anexhaust duct 21. - The
impeller 15 draws air axially into thecentral region 17 through theaperture 29 from thecavity 19, disposed on the opposite side of theimpeller 15 to the motor 13: This creates a drop in pressure in thecavity 19 which causes air to flow from the atmosphere through the dust separation unit (not shown) and into thecavity 19, whereupon it is discharged to atmosphere through theimpeller 15 andexhaust 21 as hereinbefore described. - Conventional cleaners of this type function extremely well. However, we have realised that by making a relatively straightforward modification to the fan unit, the suction power of the cleaner can surprisingly be increased by approximately 15%.
- Thus in accordance with the present invention, the
cavity 19 is filled by acylindrical insert 20 of expanded polypropylene material. - An involuted through
passage 22 extends through theinsert 20, with one end of thepassage 22 extending axially to communicate directly with thetangential inlet duct 10 from the outlet of the separation unit and the other end extending axially to communicate directly with theaperture 29 in thefront plate 18 of the impeller 15: preferably this end of thepassage 22 is circular in cross-section and has a diameter which is substantially equal to the diameter of theaperture 29 in thefront plate 18 of theimpeller 15. - The
insert 20 effectively fills thecavity 19, so as to maintain a substantially uniform cross-sectional area to the airflow path leading from the dust separation unit. We have found that this surprisingly increases the suction power. - We have found that in conventional vacuum cleaners any increase in the cross-sectional area of the airflow path causes a corresponding drop in velocity. Thus, the kinetic energy of the air molecules drops as the velocity falls and the airflow expands in the
chamber 19. This drop in energy means that more power has to be exerted by themotor 13 to move the same volume of air. - Accordingly, the present invention solves the above-mentioned problem by effectively replacing the
chamber 19 with apassageway 22 having a cross-sectional area which is substantially equal to the cross-sectional area of theduct 10 and the area of theaperture 29 in thefront plate 18 of theimpeller 15. - We have also found that the vacuum cleaner is quieter in operation than conventional vacuum cleaners, since a less turbulent flow is created.
Claims (9)
- A vacuum cleaner having an inlet for dirty air, an outlet for cleaned air, an airflow path extending between the inlet and outlet, a fan unit mounted in the airflow path for causing an airflow between the inlet and outlet through a dust separation unit arranged to separate a substantial amount of the dust and other matter from the air flowing along said airflow path, the fan unit comprising a motor (13), wherein the fan unit comprises a radial flow impeller (15), the impeller being rotatable by the motor about a rotational axis, the impeller comprising a plurality of blades (16) extending radially from an axially extending central hollow region (17) having an air inlet (29) at one axial end thereof, the airflow path comprising a duct (10) having an outlet end directly aligned with the inlet (29) of the impeller, said duct (10) having a substantially uniform cross-sectional area along a substantial part of its length characterised in that the vacuum cleaner further comprises a fan chamber directly upstream of the impeller and an insert member (20) mounted within the chamber and having a passageway (22) therethrough forming a part of the duct of the airflow path.
- A vacuum cleaner as claimed in claim 1, in which the area of said outlet end of the duct (10) of the airflow path is substantially equal to the cross-sectional area of the inlet end (29) of the central hollow region (17) of the impeller (15).
- A vacuum cleaner as claimed in claims 1 or 2, in which said outlet end of the duct of the airflow path extends axially of the rotational axis of the impeller.
- A vacuum cleaner as claimed in any preceding claim, in which said outlet end of the duct of the airflow path is circular in cross-section.
- A vacuum cleaner as claimed in any preceding claim, in which the insert member comprises a solid body of material which fills the chamber apart from the passageway.
- A vacuum cleaner as claimed in any preceding claim, in which the material of the insert comprises expanded polystyrene or polypropylene.
- A vacuum cleaner as claimed in any preceding claim, in which the passageway through the insert member forms said outlet end of the duct.
- A vacuum cleaner as claimed in any preceding claim, in which the separation unit is mounted in the airflow path upstream of the fan unit, the duct having an inlet end connected to the outlet of the separation unit.
- A method of modifying a vacuum cleaner, the vacuum cleaner having an inlet for dirty air, an outlet for cleaned air, an airflow path extending between the inlet and the outlet, a fan unit mounted in the airflow path for causing an airflow between the inlet and the outlet through a dust separation unit arranged to separate a substantial amount of the dust and other matter from the air flowing along said airflow path, the fan unit comprising a radial flow impeller (15) and a motor (13) for rotating the impeller about a rotational axis, the impeller comprising a plurality of blades (16) extending radially from an axially extending central hollow region (17) having an air inlet (29) at one axial end thereof, and a fan chamber (19) directly upstream of the impeller,
comprising the step of mounting an insert member (20), having a passageway (22) therethrough, in the fan chamber (19) such that the insert member effectively fills the fan chamber and the passageway maintains a substantially uniform cross-sectional area in the part of the airflow path leading from the dust separation unit to the air inlet (29) of the impeller.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB0116539 | 2001-07-05 | ||
GB0116539A GB2377163B (en) | 2001-07-05 | 2001-07-05 | Vacuum cleaner |
Publications (3)
Publication Number | Publication Date |
---|---|
EP1273256A2 EP1273256A2 (en) | 2003-01-08 |
EP1273256A3 EP1273256A3 (en) | 2004-01-14 |
EP1273256B1 true EP1273256B1 (en) | 2010-01-06 |
Family
ID=9918037
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP02254643A Expired - Lifetime EP1273256B1 (en) | 2001-07-05 | 2002-07-02 | Vacuum cleaner |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP1273256B1 (en) |
AT (1) | ATE454077T1 (en) |
DE (1) | DE60234981D1 (en) |
ES (1) | ES2338763T3 (en) |
GB (1) | GB2377163B (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2873563B1 (en) * | 2004-07-29 | 2006-09-22 | Seb Sa | VACUUM |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NL33531C (en) * | 1929-03-09 | |||
DE19616156C1 (en) * | 1996-04-23 | 1997-10-02 | Fakir Werk Gmbh & Co | Vacuum cleaner with housing comprising lower and upper parts |
KR20000011440A (en) * | 1998-07-06 | 2000-02-25 | 마츠시타 덴끼 산교 가부시키가이샤 | Vacuum cleaner |
GB9927129D0 (en) * | 1998-11-18 | 2000-01-12 | White Consolidated Ind Inc | Battery power combination vacuum cleaner |
KR100357516B1 (en) * | 2000-06-30 | 2002-10-18 | 삼성광주전자 주식회사 | Reflux cleaner |
-
2001
- 2001-07-05 GB GB0116539A patent/GB2377163B/en not_active Expired - Fee Related
-
2002
- 2002-07-02 EP EP02254643A patent/EP1273256B1/en not_active Expired - Lifetime
- 2002-07-02 ES ES02254643T patent/ES2338763T3/en not_active Expired - Lifetime
- 2002-07-02 AT AT02254643T patent/ATE454077T1/en not_active IP Right Cessation
- 2002-07-02 DE DE60234981T patent/DE60234981D1/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
ES2338763T3 (en) | 2010-05-12 |
ATE454077T1 (en) | 2010-01-15 |
GB2377163A (en) | 2003-01-08 |
EP1273256A3 (en) | 2004-01-14 |
GB2377163B (en) | 2004-12-15 |
EP1273256A2 (en) | 2003-01-08 |
GB0116539D0 (en) | 2001-08-29 |
DE60234981D1 (en) | 2010-02-25 |
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