US20080179133A1 - Sound dampening passage and surface cleaning apparatus with same - Google Patents
Sound dampening passage and surface cleaning apparatus with same Download PDFInfo
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- US20080179133A1 US20080179133A1 US11/954,300 US95430007A US2008179133A1 US 20080179133 A1 US20080179133 A1 US 20080179133A1 US 95430007 A US95430007 A US 95430007A US 2008179133 A1 US2008179133 A1 US 2008179133A1
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- passage
- sound dampening
- surface cleaning
- cleaning apparatus
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Images
Classifications
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- 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
- A47L5/225—Convertible suction cleaners, i.e. convertible between different types thereof, e.g. from upright suction cleaners to sledge-type suction cleaners
-
- 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
- A47L5/28—Suction cleaners with handles and nozzles fixed on the casings, e.g. wheeled suction cleaners with steering handle
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- 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
- A47L5/28—Suction cleaners with handles and nozzles fixed on the casings, e.g. wheeled suction cleaners with steering handle
- A47L5/32—Suction cleaners with handles and nozzles fixed on the casings, e.g. wheeled suction cleaners with steering handle with means for connecting a hose
-
- 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
- A47L5/36—Suction cleaners with hose between nozzle and casing; Suction cleaners for fixing on staircases; Suction cleaners for carrying on the back
-
- 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
- A47L5/36—Suction cleaners with hose between nozzle and casing; Suction cleaners for fixing on staircases; Suction cleaners for carrying on the back
- A47L5/365—Suction cleaners with hose between nozzle and casing; Suction cleaners for fixing on staircases; Suction cleaners for carrying on the back of the vertical type, e.g. tank or bucket type
-
- 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
-
- 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
- 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
- A47L9/10—Filters; Dust separators; Dust removal; Automatic exchange of filters
- A47L9/16—Arrangement or disposition of cyclones or other devices with centrifugal action
-
- 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
- A47L9/10—Filters; Dust separators; Dust removal; Automatic exchange of filters
- A47L9/16—Arrangement or disposition of cyclones or other devices with centrifugal action
- A47L9/1608—Cyclonic chamber constructions
-
- 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
- A47L9/10—Filters; Dust separators; Dust removal; Automatic exchange of filters
- A47L9/16—Arrangement or disposition of cyclones or other devices with centrifugal action
- A47L9/165—Construction of inlets
Definitions
- the invention relates to a surface cleaning apparatus and to sound dampening passages downstream from fluid flow motors.
- the invention relates to a surface cleaning apparatus that has a sound dampening passage that comprises an outer sound reflecting material and an inner sound absorbing material.
- Such apparatuses include vacuum cleaners such as upright vacuum cleaners, hand or strap carryable vacuum cleaners, wet-dry vacuum cleaners, and carpet extractors, amongst others. These apparatuses typically include at least one suction or fluid flow motor. Generally, the motor produces a significant amount of noise, which can be uncomfortable to a user. For example, many full size vacuum cleaner use a 10A-13A motor.
- a filter such as a HEPA filter downstream from the suction motor.
- the filter is provided to collect fine particulate matter that is in the air stream that exits the vacuum cleaner, such as carbon dust.
- plastic housings of varying design have been suggested to surround a suction motor of a vacuum cleaner, so as to function as a sound shield. These designs add weight to the vacuum cleaner and provide an additional wall between the suction motor and the exterior of the vacuum cleaner.
- a surface cleaning apparatus comprising a fluid flow path extending from a dirty fluid inlet to a clean air outlet and including a suction motor. At least one cleaning stage is positioned in the fluid flow path.
- the suction motor is positioned in a housing of the surface cleaning apparatus and upstream of the clean air outlet.
- a sound dampening passage is provided downstream from the suction motor and in fluid flow communication with the clean air outlet. At least a portion of the sound dampening passage comprises a first layer of a sound reflecting material and an inner layer of sound absorbing material.
- Embodiments in accordance with this broad aspect are advantageous because the sound dampening passage may reduce the amount of sound exiting the clean air outlet. Accordingly, a user may perceive the surface cleaning apparatus to be less noisy, and therefore the surface cleaning apparatus may be more comfortable and acceptable.
- the passage comprises at least a pair of opposed walls wherein each wall comprises a first layer of a sound reflecting material and an inner layer of sound absorbing material.
- the sound reflecting material is selected from plastic and metal. In some embodiments, the sound absorbing material is selected from foam, rubber, silicone, a member having pockets filled will one of air or fluid and combinations thereof.
- the sound dampening passage comprises a longitudinally extending conduit interior of the housing having continuous sidewalls.
- the sound dampening passage is positioned exterior to the housing downstream of the clean air outlet.
- the sound dampening passage extends between an outer wall of the surface cleaning apparatus and a sound dampening panel mounted to the surface cleaning apparatus and the sound dampening panel comprises a first outer layer of a sound reflecting material and the inner layer of sound absorbing material.
- the sound dampening panel is removably mounted to the surface cleaning apparatus. Such embodiments may be advantageous because a user may remove the sound dampening panel in order to clean out the clean air outlet or a post motor filter provided therein.
- the sound dampening passage extends at an angle to a direction of airflow entering the sound dampening passage. In further embodiments, the angle is greater than 15°. In further embodiments, the angle is about 90°.
- the sound dampening passage extends linearly. In some embodiments, the sound dampening passage has at least a curved section. For example, it may be helical, e.g., extending around part or all of the outer circumference of the surface cleaning apparatus.
- the sound dampening passage has a cross sectional area transverse to its longitudinal extent that decreases in a downstream direction. In other embodiments, the sound dampening passage has a cross sectional area transverse to its longitudinal extent that increases in a downstream direction. For example, if the passage is circular in cross section, the diameter may increase or decrease in the downstream direction. Alternately, in some embodiments, the cross section may remain generally constant.
- a sound dampening passage positionable downstream from a fluid flow motor.
- the sound dampening passage comprises at least a pair of opposed walls.
- Each wall comprises a first layer of a sound reflecting material and at least one, and preferably each opposed wall, is provided with an inner layer of sound absorbing material.
- the sound reflecting material is selected from plastic and metal. In some embodiments, the sound absorbing material is selected from foam, rubber, silicone, a member having pockets filled will one of air or fluid and combinations thereof.
- the sound dampening passage comprises a longitudinally extending conduit interior of a housing of the fluid flow motor having continuous sidewalls.
- the sound dampening passage is positioned exterior to a housing of the fluid flow motor and downstream of an air outlet of the housing.
- the sound dampening passage extends between an outer wall of the housing and a sound dampening panel spaced from the housing and the sound dampening panel comprises the first layer of a sound reflecting material and the inner layer of sound absorbing material.
- the sound dampening panel is removably mounted.
- the sound dampening passage extends at an angle to a direction of airflow entering the sound dampening passage. In some embodiments, the angle is greater than 15°. In further embodiments, the angle is about 90°.
- the sound dampening passage extends linearly. In some embodiments, the sound dampening passage has at least a curved section.
- the sound dampening passage has a cross sectional area transverse to its longitudinal extent that decreases in a downstream direction. In other embodiments, the sound dampening passage has a cross sectional area transverse to its longitudinal extent that increases in a downstream direction.
- FIG. 1 is a perspective view of an embodiment of a surface cleaning apparatus in accordance with the present invention
- FIG. 2 is a perspective view of an alternate embodiment of a surface cleaning apparatus in accordance with the present invention.
- FIG. 3 is a front elevation of the embodiment of FIG. 1 ;
- FIG. 4 is a rear elevation of the embodiment of FIG. 1 ;
- FIG. 5 is a top plan view of the surface cleaning head of FIG. 1 ;
- FIG. 6 is a cross section taken along line 6 - 6 in FIG. 1 ;
- FIG. 7 is a side elevation of the embodiment of FIG. 1 ;
- FIG. 8 is a cross section taken along line 8 - 8 in FIG. 1 ;
- FIG. 9 is a side elevation of the embodiment of FIG. 1 , showing a dirt chamber in an open position;
- FIG. 10 is a perspective view of the embodiment shown in FIG. 9 ;
- FIG. 11A is a cross section taken along line 9 - 9 in FIG. 1 , showing a direction of airflow through a suction motor housing;
- FIG. 11B is an exploded view of the suction motor housing of FIG. 11A ;
- FIGS. 12-15 are cross sections taken along line 12 - 12 in FIG. 1 , showing alternate embodiments of a sound dampening passage.
- the sound dampening passage is useable in various household appliances and tools wherein air is expelled from the apparatus.
- the air is drawn past a fluid flow motor and then travels through a passage to the ambient.
- Part, and preferably all, of the passage is constructed as disclosed herein.
- the passage of the air through the passage reduces the noise level perceived by a user of the apparatus.
- the passage is used in a surface cleaning apparatus. Any surface cleaning apparatus or any configuration may be used.
- the upright vacuum cleaners shown in FIGS. 1-10 merely exemplify the application of the sound passage as an exterior part provided on an upright vacuum cleaner. It will be appreciated that such a design may be useful as a retrofit to existing models.
- the passage may be provided internal of the housing of the vacuum cleaner.
- the design may be used with an upright surface cleaning apparatus, a canister surface cleaning apparatus, a stick vac, a back pack vacuum cleaner, a wet/dry or shop vac style surface cleaning apparatus, a carpet extractor, a hand or strap carriable surface cleaning apparatus or other type of surface cleaning apparatus.
- surface cleaning apparatus 10 comprises a dirty fluid inlet 12 , and a clean air outlet 14 .
- a fluid flow path extends from the dirty fluid inlet to the clean air outlet.
- the dirty fluid inlet 12 is provided in a surface cleaning head 16
- clean air outlet 14 is provided in an upright section 18 .
- clean air outlet 14 may be provided in surface cleaning head 16 .
- both dirty fluid inlet 12 and clean air outlet 14 may be provided, for example, in a main housing for the surface cleaning apparatus.
- the fluid flow path comprises a suction motor 20 , and at least one cleaning stage 22 . Fluid from dirty fluid inlet 12 is directed to the at least one cleaning stage 22 .
- an upflow duct 24 is mounted between surface cleaning head 16 and cleaning stage 22 for providing fluid communication therebetween.
- surface cleaning apparatus 10 is, e.g., a hand-carryable vacuum cleaner
- an upflow duct may not be provided, and the dirty fluid inlet may be in direct fluid communication with the cleaning stage.
- fluid passes directly from dirty fluid inlet 12 to cleaning stage 22 via upflow duct 24 .
- other components may be positioned between dirty fluid inlet 12 and cleaning stage 22 ; for example one or more filter assemblies.
- the surface cleaning apparatus includes at least one cyclonic cleaning stage.
- cleaning stage 22 comprises a cyclonic cleaning stage having a single cyclone chamber 26 .
- Chamber 26 comprises a fluid inlet 28 , a dirt or separated material outlet 30 , and an air outlet 32 .
- cleaning stage 22 may be, for example, a multi-cyclone assembly, having a plurality of cyclone chambers in parallel.
- a dirt chamber 34 is positioned below cleaning stage 22 .
- Dirt chamber 34 is in fluid communication with dirt outlet 30 , and collects dirt and/or fluid removed from air in cyclone chamber 26 .
- dirt chamber 34 is openable such that dirt collected therein may be emptied.
- dirt chamber 34 is slideably removable from cyclone chamber 26 .
- dirt chamber 34 may have a bottom that is pivotally openable. It will be appreciated that dirt chamber 34 may be emptied in any manner known in the vacuum cleaner art.
- dirt chamber 34 may be removable with cyclone chamber 22 from the vacuum cleaner. Alternately, an openable door may be provided.
- a divider plate 36 is associated with dirt outlet 30 .
- divider plate 36 may comprise a disc 38 with optional support or reinforcing ribs 40 mounted, e.g., to a sidewall of dirt chamber 34 below dirt outlet 30 (see for example FIG. 9 ).
- divider plate 36 may be, for example, mounted above or within dirt outlet 30 .
- divider plate may be of any design known in the vacuum cleaner arts. For example, it may be positioned inside a cyclone chamber wherein the dirt collection chamber is the volume positioned below the divider plate and above the bottom of the cyclone chamber.
- the divider plate may be solid or have apertures.
- the divider plate may be mounted to any surface of the dirt chamber or the cyclone chamber.
- Filter assembly 42 may comprise a filter 44 housed in a filter housing 46 (see FIG. 6 ). In alternate embodiments, a filter assembly may not be provided, or more than one filter assembly may be provided or more than one filter may be provided in filter housing 44 . It will be appreciated that any filter material or materials may be used, such as foam, HEPA and the like.
- cyclonic cleaning stage may be used.
- two cyclonic cleaning stages wherein each stage comprises a single cyclone or two or more cyclones in parallel may be used.
- motor 20 is provided in a motor housing 48 .
- Motor housing 48 may a separately molded housing, as shown, or may be, for example, integral with a housing for upright section 18 .
- a housing for another component for example surface cleaning head 16 ( FIG. 1 ) may comprise motor housing 48 (i.e. motor 20 may be positioned therein without a separate housing or with a separate housing).
- motor 20 is positioned above filter assembly 42 .
- motor 20 may be otherwise positioned.
- motor 20 may be below cyclone chamber 26 , or, as previously mentioned, in surface cleaning head 16 ( FIG. 1 ). In other types of surface cleaning apparatus, motor 20 may be at any desired location.
- a sound dampening passage 52 is provided downstream from motor 20 . Sound dampening passage 52 serves to reduce the amount of noise that is generated by motor 20 that exits clean air outlet 14 and is perceived by a user. Sound dampening passage 52 is constructed such that, as sound waves pass through the passage, they bounce or reflect between walls of the passage, and are dampened by the walls, thereby reducing the decibel level of the sound produced by the surface cleaning apparatus. Accordingly, at least a portion of passage 52 comprises a first layer of sound reflecting material 54 , and an inner layer of sound absorbing material 56 .
- passage 52 is provided downstream of clean air outlet 14 .
- clean air outlet comprises a grill 50 on the outer surface of motor housing 48 and provides fluid communication between motor housing outlet 50 and outlet 15 of the sound dampening passage 52 .
- passage 52 may be provided within the surface cleaning apparatus, such as within motor housing 48 , downstream from motor 20 and upstream from clean air outlet 14 .
- the air may travel past motor 20 and then be directed in a passage internal of the surface cleaning apparatus towards a clean air outlet that may be located distal to motor 20 .
- more than one passage 52 may be provided.
- a first passage 52 a is provided upstream from clean air outlet 14
- a second passage 52 b is provided downstream from clean air outlet 14 .
- clean air outlet 14 is directly adjacent to passage 52 and may optionally comprise part or all of motor housing 48 .
- another member may be provided between motor housing outlet 50 and passage 52 .
- a post-motor filter housed in a housing may be provided adjacent or as part of clean air outlet 14 , and passage 52 may be downstream from the post motor filter.
- a panel 59 is positioned to overlie clean air outlet 14 and to define a passage between panel 59 and motor housing 48 .
- passage 52 is downstream of clean air outlet 14 , and comprises a pair of opposed walls 58 a , 58 b .
- Wall 58 a is the inner surface of panel 59 and wall 58 b is the outer surface of motor housing 48 .
- passage 52 has an outlet 15 that essentially extends around the perimeter of panel 59 since panel 59 is spaced from motor housing 48 . Therefore, outlet 15 is located at top end 66 ( FIG. 2 ), bottom end 68 ( FIG. 2 ), and at opposed sides 70 , 72 thereof.
- passage 52 is both laterally extending (in a direction indicated by arrow L 1 ), and longitudinally extending (in a direction indicated by arrow L 2 ( FIG. 11B )).
- panel 59 may abut against part or all or housing 48 except for an outlet 15 that may be sized the same as outlet 14 .
- panel 59 may alternately house an airflow conduit therethrough that comprises part or all of passage 52 .
- wall 58 a is provided as a sound dampening panel 59 which is mounted to motor housing 48 via one or more posts 61 that are received in a mount 61 a (see FIG. 11B ).
- Sound dampening panel 59 comprises a first outer layer of sound reflecting material 54 , and an inner layer of sound absorbing material 56 .
- wall 58 a further comprises an additional outer support or reinforcing wall 63 adjacent and outwards of sound reflecting material 54 .
- support wall 63 is not provided.
- Wall 58 b comprises a portion of outer wall 60 of motor housing 50 , and a portion of outer wall 65 ( FIG. 11A ) of filter housing 46 ( FIG.
- wall 58 b may also comprise an inner layer of sound reflecting material. It will be appreciated that any exterior surface of the surface cleaning apparatus may be used as the inner wall 58 a.
- Passage 52 may be of any desired length. Preferably, the length is selected to reduce the sound to a desired decibel level. It will be appreciated that some of the sound may pass through the sound reflecting material 54 (e.g., if it is plastic having standard wall thicknesses used for vacuum cleaners). The sound reflecting material may be honeycombed to assist is further reducing sound transmission through the sound reflecting material.
- the inner wall 58 b of the passage 52 is provided with sound absorbing material. It may be the same as the sound absorbing material on panel 59 or different. Preferably the layer of sound absorbing material extends continuously across each of walls 58 a , 58 b . It will be appreciated that a layer of sound absorbing material may also be provided on the outer surface of panel 59 .
- wall 58 a is mounted to a panel 59 , which is mounted to motor housing 48 via a post 61 .
- panel 59 may be removably mounted to motor housing 48 .
- This design is advantageous if outlet 14 has a post motor filter, thereby facilitating the replacement or cleaning of the post motor filter.
- post 61 may be removably slidably received in mount 61 a provided in motor housing 48 .
- screws, welding, an adhesive or the like may be used to mount panel 59 to the surface cleaning apparatus.
- passage 52 may comprise a longitudinally extending conduit.
- the longitudinally extending conduit may be, for example, cylindrical or rectangular. Accordingly, passage 52 may have an inlet end in flow communication with motor 20 and a distal outlet 15 .
- passage 52 may be provided interior of motor housing 48 , or exterior of motor housing 48 and internal of the surface cleaning apparatus or exterior of the surface cleaning apparatus.
- the passage 52 may comprise a single cylindrical layer of sound reflecting material, and a single cylindrical layer of sound absorbing material positioned inwardly thereof.
- the passage may comprise a single cylindrical layer of sound reflecting material, and a single layer of sound absorbing material extending along only half of the conduit, for example in a half-pipe shape.
- the sound waves will reflect back and forth across the diameter of passage 52 , and will be absorbed as they pass through passage 52 .
- all walls of passage 52 may be lined with the sound absorbing material or only part of the walls may be so lined.
- the transverse cross section of passage 52 is square, there will be a pair of opposed walls, each of which may be so lined. If only part is so lined, it is preferred that the part that is lined is positioned on the outward side of the passage 52 .
- a portion of the passage 52 that faces in toward the appliance e.g., wall 58 b that has motor 20 on the other side thereof need not be so lined.
- passage 52 is configured such that it extends at an angle to a direction of flow of the air upstream of the passage.
- the air travels horizontally, e.g., if the upright section of the vacuum cleaner is oriented vertically as exemplified, as it exits outlet 14 and is then directed to by panel 59 to travel downwardly, upwardly or laterally.
- the air will undergo a change of direction of about 90° as it enters passage 52 .
- the change in direction is greater than 15°, more preferably greater than 30°, and most preferably greater than 45°.
- the change of direction may be 90° plus or minus 45°.
- the air will change direction at an angle greater then the change of direction of the sound, thereby causing the sound to be directed towards walls 58 a , 58 b .
- passage may also cause the air to undergo such changes of direction as it travels through passage 52 .
- passage 52 curves around a portion of the outer surface of the upright section of the vacuum cleaner and also defining a curved path extending horizontally, and extends vertically along axis 62 ( FIG. 11A ).
- Air entering passage 52 generally flows along an axis 64 .
- axis 62 ( FIG. 11A ) and axis 64 are approximately perpendicular.
- axis 62 ( FIG. 11A ) and axis 64 may be otherwise angled.
- axis 62 ( FIG. 11A ) and axis 64 preferably are at an angle of 15° or greater relative to each other.
- passage 52 may be a linearly extending conduit having continuous sidewalls. In other embodiments, it may be a spiral or helically extending conduit having continuous sidewalls.
- the sound dampening passage has a cross sectional area transverse to its longitudinal extent that decreases in a downstream direction (see for example, FIG. 14 ).
- the sound dampening passage may have a cross sectional area transverse to its longitudinal extent that increases in a downstream direction (see for example, FIG. 13 ).
- the sound dampening passage may have a cross sectional area transverse to its longitudinal extent that is constant in a downstream direction (see for example, FIG. 15 ). It will be appreciated that either of these designs may be used if the passage has open sides (e.g., such as when a panel 59 is used) or closed sides.
- more than one sound dampening passage may be associated with motor 20 .
- an additional passage 52 a is provided interior to housing 48 .
- the additional passage 52 a is provided by walls 76 , which include an outer layer of sound reflecting material 54 and an inner layer of sound absorbing material 56 .
- Walls 76 extend longitudinally and partially surround motor 20 . Accordingly, the sound generated by motor 20 will be partially dampened in passage 52 a prior to entering passage 52 b .
- Walls 76 may be part or all of a motor shield or housing within an outer housing of the vacuum cleaner.
- the sound reflecting material may be selected from a variety of materials.
- the sound reflecting material may be a plastic, such as ABS (acrylonitrile butadiene styrene), polycarbonate, or polyproplyene. Any hard plastic may be used.
- the sound reflecting material may be a metal, such as aluminum or steel. In some embodiments, more than one reflecting material may be selected.
- the sound reflecting portion of wall 58 a may be a metal
- the sound reflecting portion of wall 58 b may be a plastic.
- the sound absorbing material 56 may be selected from a variety of materials.
- the sound absorbing material 56 may be a foam, a rubber, or a silicone.
- the sound reflecting material may comprise pockets filled with a gas or a fluid.
- the sound reflecting material may be a bubble-wrap like material.
- a soft material is used.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Filters For Electric Vacuum Cleaners (AREA)
- Nozzles For Electric Vacuum Cleaners (AREA)
- Cleaning In General (AREA)
- Electric Suction Cleaners (AREA)
- Cyclones (AREA)
- Cleaning By Liquid Or Steam (AREA)
- Electric Vacuum Cleaner (AREA)
Abstract
A surface cleaning apparatus is disclosed. The surface cleaning apparatus comprises a fluid flow path extending from a dirty fluid inlet to a clean air outlet and including a suction motor. At least one cleaning stage is positioned in the fluid flow path. The suction motor is positioned in a housing of the surface cleaning apparatus and upstream of the clean air outlet. A sound dampening passage is provided downstream from the suction motor and in fluid flow communication with the clean air outlet. At least a portion of the sound dampening passage comprises a first layer of a sound reflecting material and an inner layer of sound absorbing material. Such a passage is useable in other household apparatus that have an air exit.
Description
- The application claims priority from U.S.
Provisional Patent Application 60/869,586 (filed on Dec. 12, 2006), which is incorporated herein by reference in its entirety. - The invention relates to a surface cleaning apparatus and to sound dampening passages downstream from fluid flow motors. In a particularly preferred embodiment, the invention relates to a surface cleaning apparatus that has a sound dampening passage that comprises an outer sound reflecting material and an inner sound absorbing material.
- Various types of surface cleaning apparatuses are known in the art. Such apparatuses include vacuum cleaners such as upright vacuum cleaners, hand or strap carryable vacuum cleaners, wet-dry vacuum cleaners, and carpet extractors, amongst others. These apparatuses typically include at least one suction or fluid flow motor. Generally, the motor produces a significant amount of noise, which can be uncomfortable to a user. For example, many full size vacuum cleaner use a 10A-13A motor.
- In some vacuum cleaner, it is known to place a filter, such as a HEPA filter downstream from the suction motor. The filter is provided to collect fine particulate matter that is in the air stream that exits the vacuum cleaner, such as carbon dust. More recently, plastic housings of varying design have been suggested to surround a suction motor of a vacuum cleaner, so as to function as a sound shield. These designs add weight to the vacuum cleaner and provide an additional wall between the suction motor and the exterior of the vacuum cleaner.
- In one broad aspect, a surface cleaning apparatus is provided. The surface cleaning apparatus comprises a fluid flow path extending from a dirty fluid inlet to a clean air outlet and including a suction motor. At least one cleaning stage is positioned in the fluid flow path. The suction motor is positioned in a housing of the surface cleaning apparatus and upstream of the clean air outlet. A sound dampening passage is provided downstream from the suction motor and in fluid flow communication with the clean air outlet. At least a portion of the sound dampening passage comprises a first layer of a sound reflecting material and an inner layer of sound absorbing material.
- Embodiments in accordance with this broad aspect are advantageous because the sound dampening passage may reduce the amount of sound exiting the clean air outlet. Accordingly, a user may perceive the surface cleaning apparatus to be less noisy, and therefore the surface cleaning apparatus may be more comfortable and acceptable.
- In some embodiments, the passage comprises at least a pair of opposed walls wherein each wall comprises a first layer of a sound reflecting material and an inner layer of sound absorbing material.
- In some embodiments, the sound reflecting material is selected from plastic and metal. In some embodiments, the sound absorbing material is selected from foam, rubber, silicone, a member having pockets filled will one of air or fluid and combinations thereof.
- In some embodiments, the sound dampening passage comprises a longitudinally extending conduit interior of the housing having continuous sidewalls.
- In some embodiments, the sound dampening passage is positioned exterior to the housing downstream of the clean air outlet. In further embodiments, the sound dampening passage extends between an outer wall of the surface cleaning apparatus and a sound dampening panel mounted to the surface cleaning apparatus and the sound dampening panel comprises a first outer layer of a sound reflecting material and the inner layer of sound absorbing material. In some embodiments, the sound dampening panel is removably mounted to the surface cleaning apparatus. Such embodiments may be advantageous because a user may remove the sound dampening panel in order to clean out the clean air outlet or a post motor filter provided therein.
- In some embodiments, the sound dampening passage extends at an angle to a direction of airflow entering the sound dampening passage. In further embodiments, the angle is greater than 15°. In further embodiments, the angle is about 90°.
- In some embodiments, the sound dampening passage extends linearly. In some embodiments, the sound dampening passage has at least a curved section. For example, it may be helical, e.g., extending around part or all of the outer circumference of the surface cleaning apparatus.
- In some embodiments, the sound dampening passage has a cross sectional area transverse to its longitudinal extent that decreases in a downstream direction. In other embodiments, the sound dampening passage has a cross sectional area transverse to its longitudinal extent that increases in a downstream direction. For example, if the passage is circular in cross section, the diameter may increase or decrease in the downstream direction. Alternately, in some embodiments, the cross section may remain generally constant.
- In another broad aspect, a sound dampening passage positionable downstream from a fluid flow motor is provided. The sound dampening passage comprises at least a pair of opposed walls. Each wall comprises a first layer of a sound reflecting material and at least one, and preferably each opposed wall, is provided with an inner layer of sound absorbing material.
- In some embodiments, the sound reflecting material is selected from plastic and metal. In some embodiments, the sound absorbing material is selected from foam, rubber, silicone, a member having pockets filled will one of air or fluid and combinations thereof.
- In some embodiments, the sound dampening passage comprises a longitudinally extending conduit interior of a housing of the fluid flow motor having continuous sidewalls.
- In some embodiments, the sound dampening passage is positioned exterior to a housing of the fluid flow motor and downstream of an air outlet of the housing.
- In some embodiments, the sound dampening passage extends between an outer wall of the housing and a sound dampening panel spaced from the housing and the sound dampening panel comprises the first layer of a sound reflecting material and the inner layer of sound absorbing material.
- In some embodiments, the sound dampening panel is removably mounted.
- In some embodiments, the sound dampening passage extends at an angle to a direction of airflow entering the sound dampening passage. In some embodiments, the angle is greater than 15°. In further embodiments, the angle is about 90°.
- In some embodiments, the sound dampening passage extends linearly. In some embodiments, the sound dampening passage has at least a curved section.
- In some embodiments, the sound dampening passage has a cross sectional area transverse to its longitudinal extent that decreases in a downstream direction. In other embodiments, the sound dampening passage has a cross sectional area transverse to its longitudinal extent that increases in a downstream direction.
- These and other advantages of the present invention will be more fully and particularly understood in connection with the following description of the preferred embodiments of the invention in which:
-
FIG. 1 is a perspective view of an embodiment of a surface cleaning apparatus in accordance with the present invention; -
FIG. 2 is a perspective view of an alternate embodiment of a surface cleaning apparatus in accordance with the present invention; -
FIG. 3 is a front elevation of the embodiment ofFIG. 1 ; -
FIG. 4 is a rear elevation of the embodiment ofFIG. 1 ; -
FIG. 5 is a top plan view of the surface cleaning head ofFIG. 1 ; -
FIG. 6 is a cross section taken along line 6-6 inFIG. 1 ; -
FIG. 7 is a side elevation of the embodiment ofFIG. 1 ; -
FIG. 8 is a cross section taken along line 8-8 inFIG. 1 ; -
FIG. 9 is a side elevation of the embodiment ofFIG. 1 , showing a dirt chamber in an open position; -
FIG. 10 is a perspective view of the embodiment shown inFIG. 9 ; -
FIG. 11A is a cross section taken along line 9-9 inFIG. 1 , showing a direction of airflow through a suction motor housing; -
FIG. 11B is an exploded view of the suction motor housing ofFIG. 11A ; and -
FIGS. 12-15 are cross sections taken along line 12-12 inFIG. 1 , showing alternate embodiments of a sound dampening passage. - The sound dampening passage is useable in various household appliances and tools wherein air is expelled from the apparatus. In accordance with the resent invention, the air is drawn past a fluid flow motor and then travels through a passage to the ambient. Part, and preferably all, of the passage is constructed as disclosed herein. The passage of the air through the passage reduces the noise level perceived by a user of the apparatus. Preferably, the passage is used in a surface cleaning apparatus. Any surface cleaning apparatus or any configuration may be used. The upright vacuum cleaners shown in
FIGS. 1-10 merely exemplify the application of the sound passage as an exterior part provided on an upright vacuum cleaner. It will be appreciated that such a design may be useful as a retrofit to existing models. Alternately, the passage may be provided internal of the housing of the vacuum cleaner. Further, the design may be used with an upright surface cleaning apparatus, a canister surface cleaning apparatus, a stick vac, a back pack vacuum cleaner, a wet/dry or shop vac style surface cleaning apparatus, a carpet extractor, a hand or strap carriable surface cleaning apparatus or other type of surface cleaning apparatus. - As shown in
FIGS. 1-7 ,surface cleaning apparatus 10 comprises adirty fluid inlet 12, and aclean air outlet 14. A fluid flow path extends from the dirty fluid inlet to the clean air outlet. In the exemplified embodiments, thedirty fluid inlet 12 is provided in asurface cleaning head 16, andclean air outlet 14 is provided in anupright section 18. In other embodiments,clean air outlet 14 may be provided insurface cleaning head 16. In yet other embodiments, whereinsurface cleaning apparatus 10 is not an upright vacuum cleaner, bothdirty fluid inlet 12 andclean air outlet 14 may be provided, for example, in a main housing for the surface cleaning apparatus. - The fluid flow path comprises a
suction motor 20, and at least onecleaning stage 22. Fluid fromdirty fluid inlet 12 is directed to the at least onecleaning stage 22. In the exemplified embodiments, an upflowduct 24 is mounted betweensurface cleaning head 16 and cleaningstage 22 for providing fluid communication therebetween. In alternate embodiments, whereinsurface cleaning apparatus 10 is, e.g., a hand-carryable vacuum cleaner, an upflow duct may not be provided, and the dirty fluid inlet may be in direct fluid communication with the cleaning stage. In the embodiment shown, fluid passes directly fromdirty fluid inlet 12 to cleaningstage 22 via upflowduct 24. In alternate embodiments, other components may be positioned between dirtyfluid inlet 12 and cleaningstage 22; for example one or more filter assemblies. - It will be appreciated that any filtration or cleaning stage or stages known in the art may be used. Preferably, the surface cleaning apparatus includes at least one cyclonic cleaning stage. For example, referring to
FIG. 8 , in the embodiment shown cleaningstage 22 comprises a cyclonic cleaning stage having asingle cyclone chamber 26.Chamber 26 comprises afluid inlet 28, a dirt or separated material outlet 30, and anair outlet 32. In alternate embodiments, cleaningstage 22 may be, for example, a multi-cyclone assembly, having a plurality of cyclone chambers in parallel. - A
dirt chamber 34 is positioned below cleaningstage 22.Dirt chamber 34 is in fluid communication with dirt outlet 30, and collects dirt and/or fluid removed from air incyclone chamber 26. Preferably,dirt chamber 34 is openable such that dirt collected therein may be emptied. For example, in the embodiment shown inFIGS. 9 and 10 ,dirt chamber 34 is slideably removable fromcyclone chamber 26. In other embodiments,dirt chamber 34 may have a bottom that is pivotally openable. It will be appreciated thatdirt chamber 34 may be emptied in any manner known in the vacuum cleaner art. For example,dirt chamber 34 may be removable withcyclone chamber 22 from the vacuum cleaner. Alternately, an openable door may be provided. - Referring back to
FIG. 8 , preferably, adivider plate 36 is associated with dirt outlet 30. For example,divider plate 36 may comprise adisc 38 with optional support or reinforcing ribs 40 mounted, e.g., to a sidewall ofdirt chamber 34 below dirt outlet 30 (see for exampleFIG. 9 ). In alternate embodiments,divider plate 36 may be, for example, mounted above or within dirt outlet 30. It will be appreciated that divider plate may be of any design known in the vacuum cleaner arts. For example, it may be positioned inside a cyclone chamber wherein the dirt collection chamber is the volume positioned below the divider plate and above the bottom of the cyclone chamber. The divider plate may be solid or have apertures. The divider plate may be mounted to any surface of the dirt chamber or the cyclone chamber. - In the embodiment shown, air exits
air outlet 32 and is directed intooptional filter assembly 42.Filter assembly 42 may comprise afilter 44 housed in a filter housing 46 (seeFIG. 6 ). In alternate embodiments, a filter assembly may not be provided, or more than one filter assembly may be provided or more than one filter may be provided infilter housing 44. It will be appreciated that any filter material or materials may be used, such as foam, HEPA and the like. - It will be appreciated that more than one cyclonic cleaning stage may be used. For example two cyclonic cleaning stages wherein each stage comprises a single cyclone or two or more cyclones in parallel may be used.
- Referring to
FIGS. 11A and 11B , air is directed fromfilter assembly 42 towardsmotor 20. In the embodiments shown,motor 20 is provided in amotor housing 48.Motor housing 48 may a separately molded housing, as shown, or may be, for example, integral with a housing forupright section 18. Alternatively, a housing for another component, for example surface cleaning head 16 (FIG. 1 ), may comprise motor housing 48 (i.e.motor 20 may be positioned therein without a separate housing or with a separate housing). In the embodiment shown,motor 20 is positioned abovefilter assembly 42. In alternate embodiments,motor 20 may be otherwise positioned. Forexample motor 20 may be belowcyclone chamber 26, or, as previously mentioned, in surface cleaning head 16 (FIG. 1 ). In other types of surface cleaning apparatus,motor 20 may be at any desired location. - As shown by arrows A1, air that enters
motor housing 48, is directed past or throughmotor 20, and out ofmotor housing outlet 50. Asound dampening passage 52 is provided downstream frommotor 20.Sound dampening passage 52 serves to reduce the amount of noise that is generated bymotor 20 that exitsclean air outlet 14 and is perceived by a user.Sound dampening passage 52 is constructed such that, as sound waves pass through the passage, they bounce or reflect between walls of the passage, and are dampened by the walls, thereby reducing the decibel level of the sound produced by the surface cleaning apparatus. Accordingly, at least a portion ofpassage 52 comprises a first layer ofsound reflecting material 54, and an inner layer ofsound absorbing material 56. - In the embodiments shown,
passage 52 is provided downstream ofclean air outlet 14. As exemplified, clean air outlet comprises agrill 50 on the outer surface ofmotor housing 48 and provides fluid communication betweenmotor housing outlet 50 andoutlet 15 of thesound dampening passage 52. In other embodiments,passage 52 may be provided within the surface cleaning apparatus, such as withinmotor housing 48, downstream frommotor 20 and upstream fromclean air outlet 14. For example, the air may travel pastmotor 20 and then be directed in a passage internal of the surface cleaning apparatus towards a clean air outlet that may be located distal tomotor 20. In further embodiments, more than onepassage 52 may be provided. For example, as shown inFIG. 15 , afirst passage 52 a is provided upstream fromclean air outlet 14, and asecond passage 52 b is provided downstream fromclean air outlet 14. - In the embodiments shown,
clean air outlet 14 is directly adjacent topassage 52 and may optionally comprise part or all ofmotor housing 48. In alternate embodiments, another member may be provided betweenmotor housing outlet 50 andpassage 52. For example, a post-motor filter housed in a housing may be provided adjacent or as part ofclean air outlet 14, andpassage 52 may be downstream from the post motor filter. - In the embodiment of
FIGS. 12 to 15 , apanel 59 is positioned to overlieclean air outlet 14 and to define a passage betweenpanel 59 andmotor housing 48. In this exemplified construction,passage 52 is downstream ofclean air outlet 14, and comprises a pair of opposedwalls 58 a, 58 b.Wall 58 a is the inner surface ofpanel 59 and wall 58 b is the outer surface ofmotor housing 48. In this embodiment,passage 52 has anoutlet 15 that essentially extends around the perimeter ofpanel 59 sincepanel 59 is spaced frommotor housing 48. Therefore,outlet 15 is located at top end 66 (FIG. 2 ), bottom end 68 (FIG. 2 ), and atopposed sides passage 52 is both laterally extending (in a direction indicated by arrow L1), and longitudinally extending (in a direction indicated by arrow L2 (FIG. 11B )). It will be appreciated that, in alternate embodiments,panel 59 may abut against part or all orhousing 48 except for anoutlet 15 that may be sized the same asoutlet 14. It will be appreciated thatpanel 59 may alternately house an airflow conduit therethrough that comprises part or all ofpassage 52. - In the embodiments shown,
wall 58 a is provided as asound dampening panel 59 which is mounted tomotor housing 48 via one ormore posts 61 that are received in amount 61 a (seeFIG. 11B ). Sound dampeningpanel 59 comprises a first outer layer ofsound reflecting material 54, and an inner layer ofsound absorbing material 56. In the embodiment ofFIG. 12 ,wall 58 a further comprises an additional outer support or reinforcingwall 63 adjacent and outwards ofsound reflecting material 54. In the embodiment ofFIG. 13 ,support wall 63 is not provided. Wall 58 b comprises a portion ofouter wall 60 ofmotor housing 50, and a portion of outer wall 65 (FIG. 11A ) of filter housing 46 (FIG. 7 ), and comprises a single layer of sound reflecting material, which is the wall of the housing itself. In an alternate embodiment, wall 58 b may also comprise an inner layer of sound reflecting material. It will be appreciated that any exterior surface of the surface cleaning apparatus may be used as theinner wall 58 a. - In use, sound, exemplified by stippled arrows A2, exits
motor housing outlet 50, and enterspassage 52. Some of the sound will contactsound absorbing material 56 ofwall 58 a, and be absorbed. Some of the sound will pass throughsound absorbing material 56, contactsound reflecting material 54 ofwall 58 a, and be reflected back intopassage 52. This portion of the sound will contact wall 58 b, and again be reflected back intopassage 52, and intosound absorbing material 56 ofwall 58 a. Accordingly, while the sound passes throughpassage 52, it will reflect back and forth betweenwalls 58 a and 58 b, and will be absorbed. Accordingly, thesound exiting outlet 15 will be dampened. Accordingly, as the sound passes thoughpassage 52, sound that is not absorbed bysound absorbing material 56 will be reflected back intopassage 52 by thesound reflecting material 54. This process will continue until the air exitspassage 52.Passage 52 may be of any desired length. Preferably, the length is selected to reduce the sound to a desired decibel level. It will be appreciated that some of the sound may pass through the sound reflecting material 54 (e.g., if it is plastic having standard wall thicknesses used for vacuum cleaners). The sound reflecting material may be honeycombed to assist is further reducing sound transmission through the sound reflecting material. - It will be appreciated that if the inner wall 58 b of the
passage 52 is provided with sound absorbing material. It may be the same as the sound absorbing material onpanel 59 or different. Preferably the layer of sound absorbing material extends continuously across each ofwalls 58 a, 58 b. It will be appreciated that a layer of sound absorbing material may also be provided on the outer surface ofpanel 59. - In the embodiment of
FIG. 12 , as previously mentioned,wall 58 a is mounted to apanel 59, which is mounted tomotor housing 48 via apost 61. In some embodiments,panel 59 may be removably mounted tomotor housing 48. This design is advantageous ifoutlet 14 has a post motor filter, thereby facilitating the replacement or cleaning of the post motor filter. For example, post 61 may be removably slidably received inmount 61 a provided inmotor housing 48. Alternatively, screws, welding, an adhesive or the like may be used to mountpanel 59 to the surface cleaning apparatus. - In some embodiments, rather than a pair of opposed walls,
passage 52 may comprise a longitudinally extending conduit. The longitudinally extending conduit may be, for example, cylindrical or rectangular. Accordingly,passage 52 may have an inlet end in flow communication withmotor 20 and adistal outlet 15. In such embodiments,passage 52 may be provided interior ofmotor housing 48, or exterior ofmotor housing 48 and internal of the surface cleaning apparatus or exterior of the surface cleaning apparatus. In some such embodiments, thepassage 52 may comprise a single cylindrical layer of sound reflecting material, and a single cylindrical layer of sound absorbing material positioned inwardly thereof. In other such embodiments, the passage may comprise a single cylindrical layer of sound reflecting material, and a single layer of sound absorbing material extending along only half of the conduit, for example in a half-pipe shape. In this embodiment, the sound waves will reflect back and forth across the diameter ofpassage 52, and will be absorbed as they pass throughpassage 52. Accordingly, all walls ofpassage 52 may be lined with the sound absorbing material or only part of the walls may be so lined. For example, if the transverse cross section ofpassage 52 is square, there will be a pair of opposed walls, each of which may be so lined. If only part is so lined, it is preferred that the part that is lined is positioned on the outward side of thepassage 52. For example, a portion of thepassage 52 that faces in toward the appliance (e.g., wall 58 b that hasmotor 20 on the other side thereof need not be so lined. - Preferably, in some of the above embodiments such as that exemplified in
FIG. 11A ,passage 52 is configured such that it extends at an angle to a direction of flow of the air upstream of the passage. As exemplified inFIG. 11A , the air travels horizontally, e.g., if the upright section of the vacuum cleaner is oriented vertically as exemplified, as it exitsoutlet 14 and is then directed to bypanel 59 to travel downwardly, upwardly or laterally. Thus, the air will undergo a change of direction of about 90° as it enterspassage 52. Preferably, the change in direction is greater than 15°, more preferably greater than 30°, and most preferably greater than 45°. For example, the change of direction may be 90° plus or minus 45°. In such an embodiment, the air will change direction at an angle greater then the change of direction of the sound, thereby causing the sound to be directed towardswalls 58 a, 58 b. Alternately, or in addition, passage may also cause the air to undergo such changes of direction as it travels throughpassage 52. - For example, in the embodiments shown,
passage 52 curves around a portion of the outer surface of the upright section of the vacuum cleaner and also defining a curved path extending horizontally, and extends vertically along axis 62 (FIG. 11A ).Air entering passage 52 generally flows along anaxis 64. In the embodiment shown, axis 62 (FIG. 11A ) andaxis 64 are approximately perpendicular. In other embodiments, axis 62 (FIG. 11A ) andaxis 64 may be otherwise angled. For example, axis 62 (FIG. 11A ) andaxis 64 preferably are at an angle of 15° or greater relative to each other. - In some embodiments,
passage 52 may be a linearly extending conduit having continuous sidewalls. In other embodiments, it may be a spiral or helically extending conduit having continuous sidewalls. - Alternately, or in addition, in some embodiments, the sound dampening passage has a cross sectional area transverse to its longitudinal extent that decreases in a downstream direction (see for example,
FIG. 14 ). In alternate embodiments, the sound dampening passage may have a cross sectional area transverse to its longitudinal extent that increases in a downstream direction (see for example,FIG. 13 ). In alternate embodiments, the sound dampening passage may have a cross sectional area transverse to its longitudinal extent that is constant in a downstream direction (see for example,FIG. 15 ). It will be appreciated that either of these designs may be used if the passage has open sides (e.g., such as when apanel 59 is used) or closed sides. - In some embodiments, as previously mentioned, more than one sound dampening passage may be associated with
motor 20. For example, as shown inFIG. 15 , in addition to thepassage 52 b provided bywalls 58 a and 58 b, anadditional passage 52 a is provided interior tohousing 48. Theadditional passage 52 a is provided bywalls 76, which include an outer layer ofsound reflecting material 54 and an inner layer ofsound absorbing material 56.Walls 76 extend longitudinally and partially surroundmotor 20. Accordingly, the sound generated bymotor 20 will be partially dampened inpassage 52 a prior to enteringpassage 52 b.Walls 76 may be part or all of a motor shield or housing within an outer housing of the vacuum cleaner. - In the above embodiments, the sound reflecting material may be selected from a variety of materials. For example, the sound reflecting material may be a plastic, such as ABS (acrylonitrile butadiene styrene), polycarbonate, or polyproplyene. Any hard plastic may be used. Alternatively or in addition, the sound reflecting material may be a metal, such as aluminum or steel. In some embodiments, more than one reflecting material may be selected. For example, the sound reflecting portion of
wall 58 a may be a metal, and the sound reflecting portion of wall 58 b may be a plastic. - Additionally, the
sound absorbing material 56 may be selected from a variety of materials. For example, the in some embodiments, thesound absorbing material 56 may be a foam, a rubber, or a silicone. In alternate embodiments, the sound reflecting material may comprise pockets filled with a gas or a fluid. For example, the sound reflecting material may be a bubble-wrap like material. Preferably, a soft material is used. - While the above description provides examples of the embodiments, it will be appreciated that some features and/or functions of the described embodiments are susceptible to modification without departing from the spirit and principles of operation of the described embodiments. Accordingly, what has been described above has been intended to be illustrative of the invention and non-limiting and it will be understood by persons skilled in the art that other variants and modifications may be made without departing from the scope of the invention as defined in the claims appended hereto.
Claims (30)
1. A surface cleaning apparatus comprising:
(a) a fluid flow path extending from a dirty fluid inlet to a clean air outlet of including a suction motor;
(b) at least one cleaning stage positioned in the fluid flow path;
(c) the suction motor positioned in a housing of the surface cleaning apparatus and upstream of the clean air outlet; and,
(d) a sound dampening passage downstream from the suction motor and in fluid flow communication with the clean air outlet wherein at least a portion of the sound dampening passage comprises a first layer of a sound reflecting material and an inner layer of sound absorbing material.
2. The surface cleaning apparatus of claim 1 wherein the passage comprises at least a pair of opposed walls wherein each wall comprises a first layer of a sound reflecting material and an inner layer of sound absorbing material.
3. The surface cleaning apparatus of claim 1 wherein the sound reflecting material is selected from plastic and metal.
4. The surface cleaning apparatus of claim 1 wherein the sound absorbing material is selected from foam, rubber, silicone, a member having pockets filled will one of air or fluid and combinations thereof.
5. The surface cleaning apparatus of claim 1 wherein the sound dampening passage comprises a longitudinally extending conduit interior of the housing, the longitudinally extending conduit having continuous sidewalls.
6. The surface cleaning apparatus of claim 1 wherein the sound dampening passage is positioned exterior to the housing downstream of the clean air outlet.
7. The surface cleaning apparatus of claim 6 wherein the sound dampening passage comprises an outer wall of the surface cleaning apparatus and a sound dampening panel mounted to the surface cleaning apparatus and the sound dampening panel comprises the first layer of the sound reflecting material and the inner layer of sound absorbing material.
8. The surface cleaning apparatus of claim 6 wherein the sound dampening panel is removably mounted to the surface cleaning apparatus.
9. The surface cleaning apparatus of claim 1 wherein the sound dampening passage extends at an angle to a direction of airflow entering the sound dampening passage.
10. The surface cleaning apparatus of claim 9 wherein the angle is greater than 15°.
11. The surface cleaning apparatus of claim 9 wherein the angle is about 90°.
12. The surface cleaning apparatus of claim 1 wherein the sound dampening passage extends linearly.
13. The surface cleaning apparatus of claim 1 wherein the sound dampening passage has at least a curved section.
14. The surface cleaning apparatus of claim 1 wherein the sound dampening passage has a cross sectional area transverse to its longitudinal extent that decreases in a downstream direction.
15. The surface cleaning apparatus of claim 1 wherein the sound dampening passage has a cross sectional area transverse to its longitudinal extent that increases in a downstream direction.
16. A sound dampening passage positionable downstream from a fluid flow motor comprising at least a pair of opposed walls wherein each wall comprises a first layer of a sound reflecting material and at least one wall has an inner layer of sound absorbing material.
17. The sound dampening passage of claim 16 wherein the sound reflecting material is selected from plastic and metal.
18. The sound dampening passage of claim 16 wherein the sound absorbing material is selected from foam, rubber, silicone, a member having pockets filled will one of air or fluid and combinations thereof.
19. The sound dampening passage of claim 16 wherein the sound dampening passage comprises a longitudinally extending conduit interior of a housing of the fluid flow motor having continuous sidewalls.
20. The sound dampening passage of claim 16 wherein the sound dampening passage is positioned exterior to a housing of the fluid flow motor and downstream of an air outlet of the housing.
21. The sound dampening passage of claim 20 wherein the sound dampening passage comprises an outer wall of the housing and a sound dampening panel spaced from the housing and the sound dampening panel comprises the first layer of a sound reflecting material and the inner layer of sound absorbing material.
22. The sound dampening passage of claim 21 wherein the sound dampening panel is removably mounted.
23. The sound dampening passage of claim 16 wherein the sound dampening passage extends at an angle to a direction of airflow entering the sound dampening passage.
24. The sound dampening passage of claim 23 wherein the angle is greater than 15°.
25. The sound dampening passage of claim 23 wherein the angle is about 90°.
26. The sound dampening passage of claim 16 wherein the sound dampening passage extends linearly.
27. The sound dampening passage of claim 16 wherein the sound dampening passage has at least a curved section.
28. The sound dampening passage of claim 16 wherein the sound dampening passage has a cross sectional area transverse to its longitudinal extent that decreases in a downstream direction.
29. The sound dampening passage of claim 16 wherein the sound dampening passage has a cross sectional area transverse to its longitudinal extent that increases in a downstream direction.
30. The sound dampening passage of claim 16 wherein each opposed wall is provided with the inner layer of sound absorbing material.
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US14/471,693 Abandoned US20140366310A1 (en) | 2006-12-12 | 2014-08-28 | Upright Vacuum Cleaner |
US15/046,895 Active 2029-01-14 US10076217B2 (en) | 2006-12-12 | 2016-02-18 | Upright vacuum cleaner |
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CA (3) | CA2677526C (en) |
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