US20220010798A1 - Backpack blower - Google Patents
Backpack blower Download PDFInfo
- Publication number
- US20220010798A1 US20220010798A1 US17/486,343 US202117486343A US2022010798A1 US 20220010798 A1 US20220010798 A1 US 20220010798A1 US 202117486343 A US202117486343 A US 202117486343A US 2022010798 A1 US2022010798 A1 US 2022010798A1
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- US
- United States
- Prior art keywords
- impeller
- blower
- drive shaft
- rib
- chamber
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/26—Rotors specially for elastic fluids
- F04D29/263—Rotors specially for elastic fluids mounting fan or blower rotors on shafts
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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
- A47L5/14—Structural features of suction cleaners with power-driven air-pumps or air-compressors, e.g. driven by motor vehicle engine vacuum cleaning by blowing-off, also combined with suction cleaning
-
- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
- A47L5/00—Structural features of suction cleaners
- A47L5/12—Structural features of suction cleaners with power-driven air-pumps or air-compressors, e.g. driven by motor vehicle engine vacuum
- A47L5/22—Structural features of suction cleaners with power-driven air-pumps or air-compressors, e.g. driven by motor vehicle engine vacuum with rotary fans
- A47L5/36—Suction cleaners with hose between nozzle and casing; Suction cleaners for fixing on staircases; Suction cleaners for carrying on the back
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01H—STREET CLEANING; CLEANING OF PERMANENT WAYS; CLEANING BEACHES; DISPERSING OR PREVENTING FOG IN GENERAL CLEANING STREET OR RAILWAY FURNITURE OR TUNNEL WALLS
- E01H1/00—Removing undesirable matter from roads or like surfaces, with or without moistening of the surface
- E01H1/08—Pneumatically dislodging or taking-up undesirable matter or small objects; Drying by heat only or by streams of gas; Cleaning by projecting abrasive particles
- E01H1/0809—Loosening or dislodging by blowing ; Drying by means of gas streams
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D17/00—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps
- F04D17/08—Centrifugal pumps
- F04D17/16—Centrifugal pumps for displacing without appreciable compression
- F04D17/162—Double suction pumps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D25/00—Pumping installations or systems
- F04D25/02—Units comprising pumps and their driving means
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D25/00—Pumping installations or systems
- F04D25/02—Units comprising pumps and their driving means
- F04D25/08—Units comprising pumps and their driving means the working fluid being air, e.g. for ventilation
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/002—Details, component parts, or accessories especially adapted for elastic fluid pumps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/26—Rotors specially for elastic fluids
- F04D29/28—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps
- F04D29/281—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps for fans or blowers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/40—Casings; Connections of working fluid
- F04D29/403—Casings; Connections of working fluid especially adapted for elastic fluid pumps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/60—Mounting; Assembling; Disassembling
- F04D29/62—Mounting; Assembling; Disassembling of radial or helico-centrifugal pumps
- F04D29/624—Mounting; Assembling; Disassembling of radial or helico-centrifugal pumps especially adapted for elastic fluid pumps
- F04D29/626—Mounting or removal of fans
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16M—FRAMES, CASINGS OR BEDS OF ENGINES, MACHINES OR APPARATUS, NOT SPECIFIC TO ENGINES, MACHINES OR APPARATUS PROVIDED FOR ELSEWHERE; STANDS; SUPPORTS
- F16M13/00—Other supports for positioning apparatus or articles; Means for steadying hand-held apparatus or articles
- F16M13/04—Other supports for positioning apparatus or articles; Means for steadying hand-held apparatus or articles for supporting on, or holding steady relative to, a person, e.g. by chains, e.g. rifle butt or pistol grip supports, supports attached to the chest or head
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
- A01G20/00—Cultivation of turf, lawn or the like; Apparatus or methods therefor
- A01G20/40—Apparatus for cleaning the lawn or grass surface
- A01G20/43—Apparatus for cleaning the lawn or grass surface for sweeping, collecting or disintegrating lawn debris
- A01G20/47—Vacuum or blower devices
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/26—Rotors specially for elastic fluids
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/40—Casings; Connections of working fluid
- F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
- F04D29/4206—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for elastic fluid pumps
- F04D29/4226—Fan casings
- F04D29/4233—Fan casings with volutes extending mainly in axial or radially inward direction
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/40—Casings; Connections of working fluid
- F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
- F04D29/4206—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for elastic fluid pumps
- F04D29/4226—Fan casings
- F04D29/424—Double entry casings
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/40—Casings; Connections of working fluid
- F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
- F04D29/44—Fluid-guiding means, e.g. diffusers
- F04D29/441—Fluid-guiding means, e.g. diffusers especially adapted for elastic fluid pumps
- F04D29/444—Bladed diffusers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2250/00—Geometry
- F05D2250/10—Two-dimensional
- F05D2250/18—Two-dimensional patterned
- F05D2250/181—Two-dimensional patterned ridged
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2250/00—Geometry
- F05D2250/20—Three-dimensional
- F05D2250/24—Three-dimensional ellipsoidal
- F05D2250/241—Three-dimensional ellipsoidal spherical
Definitions
- the invention relates to a blower and, more particularly, to an impeller, impeller housing, and coupler for a blower.
- Backpack leaf blowers generally produce a constant flow of air through a nozzle, tube, or other implement that may be manipulated by a user.
- the blower is self-contained, including an internal combustion engine or other power source configured to generate the energy required to drive the device.
- internal combustion engines can be heavy, and, therefore, trade-offs are made between providing the maximum blowing capacity while minimizing the weight and bulkiness of the device.
- a blower may generally include a housing defining a chamber, a motor supported by the housing, and a mixed flow fan assembly supported in the chamber and driven by the motor to generate an air flow, the fan assembly including a pair of mixed flow fans connected as a singular component, the fans being operable to draw air in opposing directions and to direct air radially outwardly.
- a blower may generally include a housing defining a chamber, a motor supported by the housing and having a drive shaft defining an axis, and an impeller supported in the chamber and driven by the motor to generate an air flow.
- the housing may define a duct having an axial height and a transverse width, the width being less than the height.
- a blower may generally include a housing defining a chamber, a motor supported by the housing and having a drive shaft defining an axis, an impeller supported in the chamber and driven by the motor to generate an air flow, the impeller having an end defining a plurality of recesses, and a coupling operable to couple the impeller to the motor, the coupling including a hub connected to the drive shaft and extending along the axis and a plurality of ribs extending from the hub, each rib being engageable in a recess to drivingly connect the drive shaft to the impeller, each rib extending in a non-radial direction from the hub.
- each rib extends tangentially relative to a circle centered on the axis.
- a blower may generally include a housing at least partially defining a chamber; a motor including a drive shaft defining a rotational axis; an impeller driven by the motor to generate an air flow in the chamber; and a coupler operably connected between the drive shaft and the impeller to transmit torque therebetween, the coupler being connected to one of the drive shaft and the impeller and including a plurality of ribs configured to engage the other of the drive shaft and the impeller, each rib defining a rib axis transverse to the rotational axis, each rib axis being arranged tangent to a circle centered on the rotational axis.
- a backpack blower may generally include a frame operable to be supported by a user and including a back plate configured to be positioned proximate a back of the user; a housing supported by the frame and at least partially defining a chamber; a motor supported by the frame; and an impeller driven by the motor about a rotational axis to generate an air flow within the chamber.
- the chamber may define a channel region having a cross-sectional shape with an axial height and a transverse width, the axial height being greater than the transverse width, the axial height increasing from a first position proximate the back plate to a second position spaced from the back plate.
- a blower may generally include a housing at least partially defining a chamber having a chamber inlet and a chamber outlet, the chamber having a non-circular cross-section proximate the chamber outlet; a tube assembly in fluid communication with the chamber, the tube assembly having a tube inlet coupled to the chamber outlet and a tube outlet, the tube assembly having a non-circular cross-section proximate the tube inlet; and an impeller operable to generate an air flow within the chamber and through the tube assembly.
- a blower may generally include a housing at least partially defining a chamber; and an impeller driven about a rotational axis to generate an air flow within the chamber, the impeller having a first axial end, an opposite, second axial end, and a periphery, the impeller defining a first airflow path having a first axial inlet proximate the first axial end and open in a first axial direction and a first radial outlet extending about the periphery and open in a substantially radial direction, the impeller defining a second airflow path separate from the first airflow path, the second airflow path having a second axial inlet proximate a second axial end and open in an opposite, second axial direction and a second radial outlet extending along the periphery of the impeller in a substantially radial direction.
- FIG. 1 is a perspective view of a backpack blower.
- FIG. 2 is a rear perspective view of the blower of FIG. 1 .
- FIG. 3 is a bottom perspective view of the blower of FIG. 1 .
- FIG. 4 is a side view of the blower of FIG. 1 .
- FIG. 5A is a cross-sectional view of the blower taken generally along line 5 A- 5 A of FIG. 1 .
- FIG. 5B is a cross-sectional view of the blower taken generally along line 5 B- 5 B of FIG. 1 .
- FIG. 6 is a cross-sectional view of the blower taken generally along line 6 - 6 of FIG. 4 .
- FIG. 7 is a perspective view of the impeller of the blower of FIG. 1 .
- FIG. 8 is a cross-sectional view of the impeller taken generally along line 8 - 8 of FIG. 7 .
- FIG. 9 is a perspective view of a coupler of the blower of FIG. 1 .
- FIG. 10 is a bottom view of the coupler of FIG. 9 .
- FIG. 11 is a perspective view of the impeller housing with an exhaust tube coupled thereto.
- FIG. 12 is a section view taken along line 12 - 12 of FIG. 11 .
- FIG. 13 is a detailed view of the exhaust tube of FIG. 12 .
- FIGS. 1-5B illustrate a backpack blower 10 .
- the blower 10 includes a frame 14 , a power source, such as an engine 18 , an impeller housing 22 defining a blower volume or chamber 26 , and an impeller 30 at least partially positioned within the blower volume 26 and configured to rotate with respect to the impeller housing 22 about an axis of rotation 34 .
- the illustrated frame 14 of the blower 10 generally has an L-shape with a back plate 38 and a base portion 42 extending from the back plate 38 .
- One or more straps e.g., shoulder straps, a waist strap, etc. (not shown) may be connected to the frame 14 to support and position the back plate 38 on a user's back.
- the back plate 38 includes a contact surface 46 and a series of apertures 50 to which the straps may be secured.
- the contact surface 46 is substantially concave in shape being shaped to substantially correspond with the contour of the user's back.
- the contact surface 46 may also include (not shown) padding, fabric covering, etc. to provide improved comfort and fit.
- the base portion 42 of the frame 14 is substantially U-shaped and includes one or more mounting locations or bosses 54 to which the impeller housing 22 may be mounted (see FIG. 3 ). As shown in FIG. 5A , the impeller housing 22 is coupled to the base portion 42 of the frame 14 with a plurality of vibration isolating elements 58 , such as springs, rubber bumpers, etc.
- the engine 18 is an internal combustion engine having a rotatable output shaft 62 .
- the engine 18 may include an electric motor, pneumatic motor, hydraulic motor, etc.
- the impeller housing 22 is constructed to provide for air flow expansion of compressed airflow at an outlet of the impeller 30 and a smooth, non-turbulent entry into a plenum formed by the air duct. Such a shape results in a low velocity air flow in the curved section (to prevent stratification) and finally acceleration into the nozzle.
- the illustrated oval shape moves the center of mass of the engine 18 as close to the user as possible and reduces the size of the blower 10 .
- the impeller housing 22 defines a pair of inlets 66 , 70 in fluid communication with the blower volume 26 and an outlet 74 .
- the impeller 30 rotates with respect to the impeller housing 22 drawing in two separate airflows 78 a , 78 b of ambient air via the two inlets 66 , 70 , respectively.
- the impeller 30 then accelerates and directs the airflows 78 a , 78 b into the blower volume 26 in which the airflows 78 a , 78 b are combined and expelled via the outlet 74 .
- the base portion 42 of the frame 14 defines a central aperture 82 substantially corresponding in size and shape to the second inlet 70 of the impeller housing 22 to allow unobstructed airflow.
- the base portion 42 is oriented at an angle 86 with respect to the back plate 38 (see FIG. 4 ). By angling the base portion 42 upwardly (e.g., with the angle 86 being less than 90 degrees), the center of mass (CM) of the backpack blower 10 is positioned closer to the user for ease of use and to reduce the stress placed on the user's back.
- the angle 86 is between about 30 degrees and 60 degrees (e.g., approximately 40 degrees).
- the impeller housing 22 includes a first clamshell body 90 a , coupled to a second clamshell body 90 b to form the blower volume 26 therebetween.
- the clamshell bodies 90 a , 90 b are generally oriented parallel to and opposite one another and are coupled along their respective perimeters 94 .
- the blower volume 26 of the impeller housing 22 is enclosed between the first and second clamshell bodies 90 a , 90 b and includes a central region 98 positioned proximate the center of the impeller housing 22 , a channel region 102 extending along the perimeter 94 of the impeller housing 22 to the outlet 74 , and a transition region 106 extending between and in fluid communication with both the central region 98 and the channel region 102 .
- the central region 98 of the volume 26 is sized and shaped to receive at least a portion of the impeller 30 .
- the central region 98 includes the first inlet 66 defined by the first clamshell body 90 a , the second inlet 70 separate from the first inlet 66 and defined by the second clamshell body 90 b , and an annular opening in fluid communication with a transition region 106 .
- the central region 98 is bounded by an upper conical wall portion 108 extending axially upwardly (e.g., toward the engine 18 ) and radially inwardly to define the first inlet 66 and a lower conical wall portion 112 extending axially downwardly (e.g., away from the engine 18 ) and radially inwardly to define the second inlet 70 .
- Both inlets 66 , 70 are substantially circular in cross-sectional shape and include a transitional fairing 116 to providing a smooth transition between the inlet 66 , 70 and the impeller 30 positioned within the central region 98 .
- Both conical wall portions 108 , 112 also include an annular groove 120 configured to receive at least a portion of a corresponding annular wall 124 of the impeller 30 . Once assembled, the interaction between the wall 124 and the annular groove 120 form a tortuous path or a labyrinth seal to minimize the flow of air from the higher pressure fan outlets 192 , 208 , and the lower pressure fan inlets 66 , 70 .
- the lower conical wall portion 112 also includes a bearing boss 128 proximate the second inlet 70 and axially aligned with the axis 34 of the impeller 30 .
- the bearing boss 128 at least partially receives a portion of a bearing 132 which, in turn, supports the impeller 30 within the blower volume 26 .
- the transition region 106 is positioned radially outside of the central region 98 and is configured to receive the airflows 78 a , 78 b from the impeller 30 and convey both airflows 78 a , 78 b to the channel region 102 .
- the transition region 106 is a substantially annular-shaped and maintains a substantially even axial height throughout. Furthermore, the transition region 106 slightly curves axially downwardly as it extends radially outwardly (see FIG. 5A-5B ).
- the transition region 106 includes one or more vanes 136 configured to direct the flow of air between the impeller 30 and the channel region 102 . More specifically, each vane 136 extends between the clamshell bodies 90 a , 90 b and has an elongated airfoil-like cross-sectional shape. As shown in FIG. 6 , the vanes 136 are angled in the direction of airflow (e.g., counterclockwise). In the illustrated construction, the vanes 136 provide mounting bosses for fasteners (not shown) connecting the clamshell bodies 90 a , 90 b and the bracket supporting the engine 18 .
- the channel region 102 includes an elongated channel extending along the perimeter 94 of the impeller housing 22 from a channel inlet 152 to the outlet 74 . More specifically, the channel region 102 originates proximate point A and extends along an extension axis 140 in a substantially counter-clockwise pattern (in FIG. 6 ) before terminating proximate point B at the outlet 74 .
- the channel region 102 extends greater than about 180 degrees and, in the illustrated embodiment, about 330 degrees to about 360 degrees (e.g., approximately 350 degrees) about the axis 34 of the impeller 30 .
- the cross-sectional shape of the channel region 102 in a plane perpendicular to the extension axis 140 is substantially oval in shape, with an axial height 144 greater than its transverse or radial width 148 at each point along the axis 140 .
- the channel region 102 defines a central plane 150 extending radially through the channel region 102 at the midpoint of the height (see FIG. 5A ).
- the cross-sectional area of the channel region 102 increases from point A to point B and in the direction of airflow.
- the axial height 144 of the channel region 102 increases from a first position proximate the back plate 38 to a second position spaced a greater distance from the back plate 38 than the first position.
- the channel region 102 accommodates a relatively increased volume of airflow therethrough while minimizing the distance between the axis 34 and the back plate 38 and between the axis and the radial periphery of the impeller housing 22 .
- the inlet 152 of the channel region 102 is formed into the sidewall and opens to the transition region 106 .
- the inlet 152 extends along substantially the entire length of the channel region 102 (e.g., from point A to point B); however, in alternative embodiments (not shown), only portions of the channel region 102 may include an inlet 152 .
- the inlet 152 of the channel region 102 is offset from the cross-sectional center of the corresponding channel region 102 . More specifically, the entire inlet 102 does not cross the central plane 150 of the channel region 102 (e.g., the inlet 102 is positioned between the central plane 150 and one axial extent 151 of the channel region 102 ; see FIG. 5A ). Stated differently, the chamber inlet 152 is completely positioned on one side of a midpoint of the axial height of the channel region 102 .
- the transition region 106 moves (e.g., curves) away from the central plane 150 such that the inlet 152 of the channel region 102 is farther from the central plane 150 than the outlet of the impeller 30 .
- the airflows 78 a , 78 b enter the channel region 102 toward one axial extent 151 of the channel region 102 .
- the illustrated location of the inlet 152 of the channel region 102 , configuration of the transition region 106 , and/or relatively larger volumetric size of the channel region 102 (when compared to the transition region 106 ) may provide a non-turbulent and low velocity entry of the air flow into the channel region 102 to prevent stratification.
- the impeller housing 22 also includes an exhaust nozzle 154 coupled to the outlet 74 and providing a connection point for an external hose, tube, etc.
- the exhaust nozzle 154 includes an outer annular wall 155 that transitions from a first cross-sectional shape, corresponding to the cross-sectional shape of the outlet 74 , to a second cross-sectional shape, having a smaller area than the first cross-sectional shape. The exhaust nozzle 154 thus serves to accelerate the airflow within the impeller housing 22 .
- the illustrated impeller 30 includes a mixed flow fan assembly with a pair of mixed flow fans connected or formed as a singular component.
- the mixed flow fan assembly includes a dual inlet mirrored mixed flow impeller is operable to draw air into the blower duct from two opposing directions from top and bottom inlets. For example, a top fan draws air across the engine 18 and into the blower duct (thereby potentially providing cooling to the engine 18 ) while a bottom fan draws air from a bottom side of the blower duct. Both fans may be formed similar to a centrifugal fan to direct the air radially outwardly into the blower duct as it leaves the blades of the respective fan.
- Such a mixed flow fan assembly may provide an increased volumetric flow rate for a given outer diameter compared to a single impeller which would be much larger, and require a larger housing, to achieve the same flow.
- the impeller 30 includes a body 156 with a first conical surface 160 terminating at a first axial end 164 and a second conical surface 168 terminating in a second axial end 172 .
- a first outer wall 176 is spaced a distance from the first conical surface 160 to define a first airflow path 180 a therebetween, and a second outer wall 184 is spaced a distance from the second conical surface 168 to define a second airflow path 180 b therebetween.
- rotation of the impeller 30 about the axis 34 draws separate airflows 78 a , 78 b into respective airflow paths 180 a , 180 b . Both airflows 78 a , 78 b are then accelerated by the impeller 30 and exhausted in radially outwardly into the transition region 106 of the blower volume 26 .
- the first airflow path 180 a is substantially annular in shape having a first inlet 188 open in an axial direction proximate the first axial end 164 and a first outlet 192 extending along the periphery 196 in a substantially radial direction (see FIG. 8 ).
- the first airflow path 180 a is shaped to smoothly transition the airflow 78 a from a substantially axial direction (e.g., into the first inlet 188 ) to a substantially radial direction (e.g., out of the first outlet 192 ).
- the first airflow path 180 a is also enclosed by the body 156 of the impeller 30 along its entire length between the first inlet 188 and the first outlet 192 .
- the first airflow path 180 a also includes a plurality of vanes 200 positioned within the airflow path 180 a and extending between the first conical surface 160 and the first outer wall 176 .
- the vanes 200 are configured to accelerate the first airflow 78 a as it passes through the first airflow path 180 a .
- the vanes 200 are swept in a direction opposite the direction of rotation of the impeller 30 .
- the second airflow path 180 b is also substantially annular in shape having a second inlet 204 open in a substantially axial direction proximate the second axial end 172 and a second outlet 208 extending along the periphery 196 in a substantially radial direction (see FIG. 8 ).
- the second airflow path 180 b is shaped to smoothly transition the second airflow 78 b from a substantially axial direction (e.g., into the second inlet 204 ) to a substantially radial direction (e.g., out of the second outlet 208 ).
- the second airflow path 180 b is also enclosed by the body 156 of the impeller 30 along its entire length between the second inlet 204 and the second outlet 208 .
- the second airflow path 180 b also includes a plurality of vanes 200 positioned within the airflow path 180 b and extending between the second conical surface 168 and the second outer wall 184 .
- the vanes 200 are configured to accelerate the second airflow 78 b as it passes through the second airflow path 180 b .
- the vanes 200 are swept in a direction opposite the direction of rotation of the impeller 30 .
- each conical wall portion 108 , 112 defines a recess 210 receiving the associated outer wall 176 , 184 of the impeller 30 .
- the inner surface of each outer wall 176 , 184 is substantially flush with the adjacent surface of the conical wall portion 108 , 112 to provide a smooth surface for the airflows 78 a , 78 b into the transition region 106 .
- the surface of each inlet 66 , 70 is substantially flush with the inner surface of the adjacent outer wall 176 , 184 for entry of the airflows 78 a , 78 b .
- the outlets 192 , 208 of the impeller 30 are positioned axially closer to the midpoint of the axial height of the channel region 102 than the chamber inlet 152 (with the upper outlet 192 being closest to the midpoint).
- the impeller 30 also defines a coupling portion 212 proximate the first axial end 164 and including an annular ridge 216 formed by the body 156 to define an aperture 218 .
- the annular ridge 216 includes a substantially hemispherical outer contour (see FIG. 7 ).
- the ridge 216 also defines a plurality of radially oriented grooves 220 spaced (e.g., equally) about the circumference.
- the impeller 30 also defines a support boss 232 aligned with the axis 34 and positioned proximate the second axial end 172 .
- the support boss 232 is configured to receive at least a portion of the bearing 132 positioned in the bearing boss 128 .
- the support boss 232 and the bearing boss 128 cooperate to position the impeller 30 within the central region of the impeller housing 22 .
- the blower 10 also includes a coupler 228 coupled to and extending between the output shaft 62 of the engine 18 and the coupling portion 212 of the impeller 30 .
- the coupler 228 is configured transmit torque between the shaft 62 and the impeller 30 so that the two elements to rotate together as a unit.
- the coupler 228 is also configured to allow some movement/misalignment between the output shaft 62 and the impeller 30 .
- the coupler 228 and the bearing boss 128 define the location of the impeller 30 within the impeller housing 22 .
- the illustrated coupling arrangement may allow for a modular assembly the engine 18 may be separated from the impeller housing 22 .
- the coupler 228 includes a central hub 236 , a semi-spherical hood 240 extending radially outwardly from the hub 236 , and a plurality of ribs 244 extending between the hub 236 and the hood 240 .
- the shape of the annular ridge 216 substantially corresponds to the inner shape of the hood 240 .
- the grooves 220 on the coupling portion 218 and ribs 244 are sized, spaced and oriented to facilitate engagement.
- the output shaft 62 of the engine 18 is rotatably coupled to a threaded aperture defined by the hub 236 .
- the coupler 228 is connected to the coupling portion 212 of the impeller 30 .
- the coupling portion 212 is at least partially inserted into the space formed between the hood 240 and the hub 236 such that the hub 236 is at least partially positioned within the aperture 218 of the ridge 216 and each rib 244 is at least partially received within a corresponding one of the grooves 220 .
- the outer surface of the hood 240 merges into the outer surface of the impeller 30 .
- each rib 244 of the coupler 228 are positioned such that an axis 248 of each rib 244 does not pass through the axis 34 (e.g., is non-radial). Rather, each rib 244 and each rib axis 248 is offset from a radial orientation. As illustrated, each rib 244 and each axis 248 extends generally tangentially to a circle about the axis 34 .
- the illustrated configuration of the coupler 228 may improve connection between the output shaft 62 and the impeller 30 and reduce noise produced during operation.
- coupler 228 is shown being attached to the drive shaft 62 with the ribs 244 engaging the impeller 30 , it should be understood that, in alternative embodiments (not shown), the coupler 228 may be attached to the impeller 30 with the ribs 244 engaging the drive shaft 62 .
- the user starts the engine 18 , and the engine 18 rotates the output shaft 62 which, in turn, causes the coupler 228 to rotate.
- the coupler 228 then transmits the torque of the engine 18 to the impeller 30 via the engagement between the ribs 244 and the grooves 220 .
- the impeller 30 and the output shaft 62 rotate together as a unit about the axis 34 .
- Rotation of the impeller 30 draws in separate airflows 78 a , 78 b into the impeller housing 22 .
- the first airflow 78 a is drawn into the first inlet 188 of the impeller 30 via the first inlet 66 of the impeller housing 22 .
- the first airflow 78 a is then accelerated by the vanes 200 in the first airflow path 180 a and exhausted radially through the first outlet 192 and into the transition region 106 .
- the second airflow 78 b is drawn into the second inlet 204 of the impeller 30 via the second inlet 70 of the impeller housing 22 .
- the second airflow 78 b is then accelerated by the vanes 200 in the second airflow path 180 b and exhausted radially through the second outlet 208 and into the transition region 106 .
- the two airflows 78 a , 78 b merge into a single airflow traveling radially outwardly over substantially the entire circumferential length of the impeller 30 .
- the combined airflow then continues to travel radially outwardly through the transition region 106 where it enters the channel region 102 of the blower volume 26 .
- the combined airflow originates proximate point A and travels in a counter clockwise-direction (in FIG. 6 ) along the channel region 102 and toward the outlet 74 .
- additional air is added to channel region 102 via the inlet 152 along the entire length of the channel region 102 .
- the volume of air increases as it travels along the length of the channel region 102 and is accommodated by the increasing cross-sectional area of the channel region 102 .
- the combined airflow After the combined airflow reaches the outlet 74 , the combined airflow enters the exhaust nozzle 154 which, as described above, tapers (e.g., the cross-sectional area decreases) and accelerates the combined airflow before it exits the blower 10 .
- tapers e.g., the cross-sectional area decreases
- FIGS. 11-13 illustrate another embodiment of the impeller housing 22 ′.
- the impeller housing 22 ′ is substantially similar to the impeller housing 22 , as described above, and only differences will be described herein.
- the impeller housing 22 ′ includes an exhaust duct or tube 252 ′ coupled to the outlet 74 ′ and configured to convey the combined airflow therethrough.
- the exhaust duct 252 ′ includes a bellows or flexible portion 260 ′ coupled to the outlet 74 ′ and a rigid portion 264 ′ coupled to and extending from the flexible portion 260 ′ to an exhaust port 268 ′.
- the combined airflow enters the flexible portion 260 ′ of the exhaust duct 252 ′ via the outlet 74 ′, flows through the flexible and rigid portions 260 ′, 264 ′, and is exhausted through the exhaust port 268 ′.
- the flexible portion 260 ′ of the exhaust duct 252 ′ is substantially elongated in shape being formed from an outer wall 274 ′ having a first end 276 ′, an opposite second end 280 ′, and at least partially defining a channel 256 ′ therethrough.
- the first end 276 ′ of the flexible portion 260 ′ is movable relative to the second end 280 ′ while generally maintaining the cross-sectional shape and the integrity of the channel 256 ′ thus assuring that air entering the first end 276 ′ is directed and passes through the second end 280 ′.
- the outer wall 274 ′ of the flexible portion 260 ′ is generally formed from a resilient and flexible material, such as rubber, etc.
- the outer wall 274 ′ has a serpentine shape and includes a flexible region or bellows portion 284 ′ with a plurality of ribs 282 ′ to permit the outer wall 274 ′ to expand, contract, and elastically deform.
- the smallest cross-sectional area formed by the flexible region 284 ′ of the outer wall 274 ′ is at least as large as the cross-sectional area of the first end 276 ′ of the flexible portion 260 ′.
- the flexible region 284 ′ does not restrict the flow of air therethrough.
- the flexible region 284 ′ Proximate its inlet, has a non-circular cross-sectional shape. In particular, the inlet of the flexible region 284 ′ is substantially oval in shape.
- the flexible portion 260 ′ and the smallest cross-sectional area of the flexible region 284 ′ have a cross-sectional shape substantially similar to the cross-sectional shape of the outlet 74 ′ of the impeller housing 22 ′, that is, having a height that is greater than its width.
- the flexible portion 260 ′ reduces pressure head loss during operation.
- the rigid portion 264 ′ of the exhaust duct 252 ′ is substantially tubular in shape having a body 286 ′ with a first end 288 ′ and an opposite second end 292 ′ forming the exhaust port 268 ′.
- the body 286 ′ of the rigid portion 264 ′ also defines a second channel 290 ′ extending therethrough and open to the exhaust port 268 ′.
- the first end 288 ′ of the rigid portion 264 ′ is coupled to the second end 280 ′ of the flexible portion 260 ′ causing the second channel 290 ′ to be in fluid communication with the first channel 256 ′.
- the body 286 ′ of the rigid portion 264 ′ transitions in cross-sectional shape from the first end 288 ′ to the second end 292 ′.
- the first end 288 ′ has a cross-sectional shape substantially similar to the cross-sectional shape of the second end 280 ′ of the flexible portion 260 ′ (e.g., non-circular or oval) and, likewise, to the cross-sectional shape of the outlet 74 ′ of the impeller housing 22 ′.
- the second end 292 ′ of the rigid portion 264 ′ is substantially circular in cross-sectional shape and has a cross-sectional area less than the cross-sectional area of the first end 288 ′. As such, the rigid portion 264 ′ of the exhaust duct 252 ′ accelerates the airflow as it passes therethrough.
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Abstract
Description
- The present application is a divisional application of U.S. patent application Ser. No. 16/003,924 filed Jun. 8, 2018 which in turn claims priority to U.S. Provisional Patent Application No. 62/570,584, filed Oct. 10, 2017. The present application also claims priority to U.S. Provisional Patent Application No. 62/570,584. The entire contents of both applications are hereby incorporated by reference.
- The invention relates to a blower and, more particularly, to an impeller, impeller housing, and coupler for a blower.
- Backpack leaf blowers generally produce a constant flow of air through a nozzle, tube, or other implement that may be manipulated by a user. In many instances, the blower is self-contained, including an internal combustion engine or other power source configured to generate the energy required to drive the device. However, internal combustion engines can be heavy, and, therefore, trade-offs are made between providing the maximum blowing capacity while minimizing the weight and bulkiness of the device.
- In one independent aspect, a blower may generally include a housing defining a chamber, a motor supported by the housing, and a mixed flow fan assembly supported in the chamber and driven by the motor to generate an air flow, the fan assembly including a pair of mixed flow fans connected as a singular component, the fans being operable to draw air in opposing directions and to direct air radially outwardly.
- In another independent aspect, a blower may generally include a housing defining a chamber, a motor supported by the housing and having a drive shaft defining an axis, and an impeller supported in the chamber and driven by the motor to generate an air flow. The housing may define a duct having an axial height and a transverse width, the width being less than the height.
- In yet another independent aspect, a blower may generally include a housing defining a chamber, a motor supported by the housing and having a drive shaft defining an axis, an impeller supported in the chamber and driven by the motor to generate an air flow, the impeller having an end defining a plurality of recesses, and a coupling operable to couple the impeller to the motor, the coupling including a hub connected to the drive shaft and extending along the axis and a plurality of ribs extending from the hub, each rib being engageable in a recess to drivingly connect the drive shaft to the impeller, each rib extending in a non-radial direction from the hub.
- In some constructions, the coupling is disposed in the chamber. In some constructions, each rib extends tangentially relative to a circle centered on the axis.
- In a further independent aspect, a blower may generally include a housing at least partially defining a chamber; a motor including a drive shaft defining a rotational axis; an impeller driven by the motor to generate an air flow in the chamber; and a coupler operably connected between the drive shaft and the impeller to transmit torque therebetween, the coupler being connected to one of the drive shaft and the impeller and including a plurality of ribs configured to engage the other of the drive shaft and the impeller, each rib defining a rib axis transverse to the rotational axis, each rib axis being arranged tangent to a circle centered on the rotational axis.
- In another independent aspect, a backpack blower may generally include a frame operable to be supported by a user and including a back plate configured to be positioned proximate a back of the user; a housing supported by the frame and at least partially defining a chamber; a motor supported by the frame; and an impeller driven by the motor about a rotational axis to generate an air flow within the chamber. The chamber may define a channel region having a cross-sectional shape with an axial height and a transverse width, the axial height being greater than the transverse width, the axial height increasing from a first position proximate the back plate to a second position spaced from the back plate.
- In yet another independent aspect, a blower may generally include a housing at least partially defining a chamber having a chamber inlet and a chamber outlet, the chamber having a non-circular cross-section proximate the chamber outlet; a tube assembly in fluid communication with the chamber, the tube assembly having a tube inlet coupled to the chamber outlet and a tube outlet, the tube assembly having a non-circular cross-section proximate the tube inlet; and an impeller operable to generate an air flow within the chamber and through the tube assembly.
- In a further independent aspect, a blower may generally include a housing at least partially defining a chamber; and an impeller driven about a rotational axis to generate an air flow within the chamber, the impeller having a first axial end, an opposite, second axial end, and a periphery, the impeller defining a first airflow path having a first axial inlet proximate the first axial end and open in a first axial direction and a first radial outlet extending about the periphery and open in a substantially radial direction, the impeller defining a second airflow path separate from the first airflow path, the second airflow path having a second axial inlet proximate a second axial end and open in an opposite, second axial direction and a second radial outlet extending along the periphery of the impeller in a substantially radial direction.
- Other independent aspects of the invention will become apparent by consideration of the detailed description, claims and accompanying drawings.
-
FIG. 1 is a perspective view of a backpack blower. -
FIG. 2 is a rear perspective view of the blower ofFIG. 1 . -
FIG. 3 is a bottom perspective view of the blower ofFIG. 1 . -
FIG. 4 is a side view of the blower ofFIG. 1 . -
FIG. 5A is a cross-sectional view of the blower taken generally alongline 5A-5A ofFIG. 1 . -
FIG. 5B is a cross-sectional view of the blower taken generally alongline 5B-5B ofFIG. 1 . -
FIG. 6 is a cross-sectional view of the blower taken generally along line 6-6 ofFIG. 4 . -
FIG. 7 is a perspective view of the impeller of the blower ofFIG. 1 . -
FIG. 8 is a cross-sectional view of the impeller taken generally along line 8-8 ofFIG. 7 . -
FIG. 9 is a perspective view of a coupler of the blower ofFIG. 1 . -
FIG. 10 is a bottom view of the coupler ofFIG. 9 . -
FIG. 11 is a perspective view of the impeller housing with an exhaust tube coupled thereto. -
FIG. 12 is a section view taken along line 12-12 ofFIG. 11 . -
FIG. 13 is a detailed view of the exhaust tube ofFIG. 12 . - Before any independent embodiments of the invention are explained in detail, it is to be understood that the invention is not limited in its application to the details of construction and the arrangement of components set forth in the following description or illustrated in the following drawings. The invention is capable of other independent embodiments and of being practiced or of being carried out in various ways. Also, it is to be understood that the phraseology and terminology used herein is for the purpose of description and should not be regarded as limiting.
- Use of “including” and “comprising” and variations thereof as used herein is meant to encompass the items listed thereafter and equivalents thereof as well as additional items. Use of “consisting of” and variations thereof as used herein is meant to encompass only the items listed thereafter and equivalents thereof.
- Relative terminology, such as, for example, “about”, “approximately”, “substantially”, etc., used in connection with a quantity or condition would be understood by those of ordinary skill to be inclusive of the stated value and has the meaning dictated by the context (for example, the term includes at least the degree of error associated with the measurement of, tolerances (e.g., manufacturing, assembly, use) associated with the particular value, etc.). Such terminology should also be considered as disclosing the range defined by the absolute values of the two endpoints. For example, the expression “from about 2 to about 4” also discloses the range “from 2 to 4”. The relative terminology may refer to plus or minus a percentage (e.g., 1%, 5%, 10% or more) of an indicated value.
-
FIGS. 1-5B illustrate abackpack blower 10. Theblower 10 includes aframe 14, a power source, such as anengine 18, animpeller housing 22 defining a blower volume orchamber 26, and animpeller 30 at least partially positioned within theblower volume 26 and configured to rotate with respect to theimpeller housing 22 about an axis ofrotation 34. - The illustrated
frame 14 of theblower 10 generally has an L-shape with aback plate 38 and abase portion 42 extending from theback plate 38. One or more straps (e.g., shoulder straps, a waist strap, etc. (not shown)) may be connected to theframe 14 to support and position theback plate 38 on a user's back. - As shown in
FIGS. 1-3 , theback plate 38 includes acontact surface 46 and a series ofapertures 50 to which the straps may be secured. In the illustrated embodiment, thecontact surface 46 is substantially concave in shape being shaped to substantially correspond with the contour of the user's back. Thecontact surface 46 may also include (not shown) padding, fabric covering, etc. to provide improved comfort and fit. - The
base portion 42 of theframe 14 is substantially U-shaped and includes one or more mounting locations orbosses 54 to which theimpeller housing 22 may be mounted (seeFIG. 3 ). As shown inFIG. 5A , theimpeller housing 22 is coupled to thebase portion 42 of theframe 14 with a plurality ofvibration isolating elements 58, such as springs, rubber bumpers, etc. - In the illustrated construction, the
engine 18 is an internal combustion engine having arotatable output shaft 62. In other constructions, theengine 18 may include an electric motor, pneumatic motor, hydraulic motor, etc. - As described below in more detail, the
impeller housing 22 is constructed to provide for air flow expansion of compressed airflow at an outlet of theimpeller 30 and a smooth, non-turbulent entry into a plenum formed by the air duct. Such a shape results in a low velocity air flow in the curved section (to prevent stratification) and finally acceleration into the nozzle. The illustrated oval shape moves the center of mass of theengine 18 as close to the user as possible and reduces the size of theblower 10. - The
impeller housing 22 defines a pair ofinlets blower volume 26 and anoutlet 74. In use, theimpeller 30 rotates with respect to theimpeller housing 22 drawing in twoseparate airflows inlets impeller 30 then accelerates and directs theairflows blower volume 26 in which theairflows outlet 74. - The
base portion 42 of theframe 14 defines a central aperture 82 substantially corresponding in size and shape to thesecond inlet 70 of theimpeller housing 22 to allow unobstructed airflow. In the illustrated embodiment, thebase portion 42 is oriented at anangle 86 with respect to the back plate 38 (seeFIG. 4 ). By angling thebase portion 42 upwardly (e.g., with theangle 86 being less than 90 degrees), the center of mass (CM) of thebackpack blower 10 is positioned closer to the user for ease of use and to reduce the stress placed on the user's back. In the illustrated construction, theangle 86 is between about 30 degrees and 60 degrees (e.g., approximately 40 degrees). - As shown in
FIGS. 1-6 , theimpeller housing 22 includes afirst clamshell body 90 a, coupled to asecond clamshell body 90 b to form theblower volume 26 therebetween. In the illustrated embodiment, theclamshell bodies respective perimeters 94. - The
blower volume 26 of theimpeller housing 22 is enclosed between the first andsecond clamshell bodies central region 98 positioned proximate the center of theimpeller housing 22, achannel region 102 extending along theperimeter 94 of theimpeller housing 22 to theoutlet 74, and atransition region 106 extending between and in fluid communication with both thecentral region 98 and thechannel region 102. - Illustrated in
FIGS. 5A-5B , thecentral region 98 of thevolume 26 is sized and shaped to receive at least a portion of theimpeller 30. Thecentral region 98 includes thefirst inlet 66 defined by thefirst clamshell body 90 a, thesecond inlet 70 separate from thefirst inlet 66 and defined by thesecond clamshell body 90 b , and an annular opening in fluid communication with atransition region 106. - In the illustrated embodiment, the
central region 98 is bounded by an upperconical wall portion 108 extending axially upwardly (e.g., toward the engine 18) and radially inwardly to define thefirst inlet 66 and a lowerconical wall portion 112 extending axially downwardly (e.g., away from the engine 18) and radially inwardly to define thesecond inlet 70. Bothinlets inlet impeller 30 positioned within thecentral region 98. - Both
conical wall portions annular groove 120 configured to receive at least a portion of a correspondingannular wall 124 of theimpeller 30. Once assembled, the interaction between thewall 124 and theannular groove 120 form a tortuous path or a labyrinth seal to minimize the flow of air from the higherpressure fan outlets pressure fan inlets - The lower
conical wall portion 112 also includes abearing boss 128 proximate thesecond inlet 70 and axially aligned with theaxis 34 of theimpeller 30. The bearingboss 128 at least partially receives a portion of abearing 132 which, in turn, supports theimpeller 30 within theblower volume 26. - As illustrated in
FIGS. 5-6 , thetransition region 106 is positioned radially outside of thecentral region 98 and is configured to receive theairflows impeller 30 and convey bothairflows channel region 102. In the illustrated embodiment, thetransition region 106 is a substantially annular-shaped and maintains a substantially even axial height throughout. Furthermore, thetransition region 106 slightly curves axially downwardly as it extends radially outwardly (seeFIG. 5A-5B ). - As illustrated, the
transition region 106 includes one ormore vanes 136 configured to direct the flow of air between theimpeller 30 and thechannel region 102. More specifically, eachvane 136 extends between theclamshell bodies FIG. 6 , thevanes 136 are angled in the direction of airflow (e.g., counterclockwise). In the illustrated construction, thevanes 136 provide mounting bosses for fasteners (not shown) connecting theclamshell bodies engine 18. - Illustrated in
FIGS. 5-6 , thechannel region 102 includes an elongated channel extending along theperimeter 94 of theimpeller housing 22 from achannel inlet 152 to theoutlet 74. More specifically, thechannel region 102 originates proximate point A and extends along anextension axis 140 in a substantially counter-clockwise pattern (inFIG. 6 ) before terminating proximate point B at theoutlet 74. Thechannel region 102 extends greater than about 180 degrees and, in the illustrated embodiment, about 330 degrees to about 360 degrees (e.g., approximately 350 degrees) about theaxis 34 of theimpeller 30. - The cross-sectional shape of the
channel region 102 in a plane perpendicular to theextension axis 140 is substantially oval in shape, with anaxial height 144 greater than its transverse orradial width 148 at each point along theaxis 140. Thechannel region 102 defines acentral plane 150 extending radially through thechannel region 102 at the midpoint of the height (seeFIG. 5A ). In the illustrated embodiment, the cross-sectional area of thechannel region 102 increases from point A to point B and in the direction of airflow. Stated differently, theaxial height 144 of thechannel region 102 increases from a first position proximate theback plate 38 to a second position spaced a greater distance from theback plate 38 than the first position. With the illustrated construction, thechannel region 102 accommodates a relatively increased volume of airflow therethrough while minimizing the distance between theaxis 34 and theback plate 38 and between the axis and the radial periphery of theimpeller housing 22. - The
inlet 152 of thechannel region 102 is formed into the sidewall and opens to thetransition region 106. In the illustrated embodiment, theinlet 152 extends along substantially the entire length of the channel region 102 (e.g., from point A to point B); however, in alternative embodiments (not shown), only portions of thechannel region 102 may include aninlet 152. - The
inlet 152 of thechannel region 102 is offset from the cross-sectional center of the correspondingchannel region 102. More specifically, theentire inlet 102 does not cross thecentral plane 150 of the channel region 102 (e.g., theinlet 102 is positioned between thecentral plane 150 and oneaxial extent 151 of thechannel region 102; seeFIG. 5A ). Stated differently, thechamber inlet 152 is completely positioned on one side of a midpoint of the axial height of thechannel region 102. In addition, from thecentral region 98 and towardchannel region 102, thetransition region 106 moves (e.g., curves) away from thecentral plane 150 such that theinlet 152 of thechannel region 102 is farther from thecentral plane 150 than the outlet of theimpeller 30. As illustrated, theairflows channel region 102 toward oneaxial extent 151 of thechannel region 102. - The illustrated location of the
inlet 152 of thechannel region 102, configuration of thetransition region 106, and/or relatively larger volumetric size of the channel region 102 (when compared to the transition region 106) may provide a non-turbulent and low velocity entry of the air flow into thechannel region 102 to prevent stratification. - The
impeller housing 22 also includes anexhaust nozzle 154 coupled to theoutlet 74 and providing a connection point for an external hose, tube, etc. Theexhaust nozzle 154 includes an outerannular wall 155 that transitions from a first cross-sectional shape, corresponding to the cross-sectional shape of theoutlet 74, to a second cross-sectional shape, having a smaller area than the first cross-sectional shape. Theexhaust nozzle 154 thus serves to accelerate the airflow within theimpeller housing 22. - Illustrated in
FIGS. 5A-5B and 7-8 , the illustratedimpeller 30 includes a mixed flow fan assembly with a pair of mixed flow fans connected or formed as a singular component. The mixed flow fan assembly includes a dual inlet mirrored mixed flow impeller is operable to draw air into the blower duct from two opposing directions from top and bottom inlets. For example, a top fan draws air across theengine 18 and into the blower duct (thereby potentially providing cooling to the engine 18) while a bottom fan draws air from a bottom side of the blower duct. Both fans may be formed similar to a centrifugal fan to direct the air radially outwardly into the blower duct as it leaves the blades of the respective fan. Such a mixed flow fan assembly may provide an increased volumetric flow rate for a given outer diameter compared to a single impeller which would be much larger, and require a larger housing, to achieve the same flow. - The
impeller 30 includes abody 156 with a firstconical surface 160 terminating at a firstaxial end 164 and a secondconical surface 168 terminating in a secondaxial end 172. A firstouter wall 176 is spaced a distance from the firstconical surface 160 to define afirst airflow path 180 a therebetween, and a secondouter wall 184 is spaced a distance from the secondconical surface 168 to define asecond airflow path 180 b therebetween. As mentioned above, rotation of theimpeller 30 about theaxis 34 drawsseparate airflows respective airflow paths airflows impeller 30 and exhausted in radially outwardly into thetransition region 106 of theblower volume 26. - The
first airflow path 180 a is substantially annular in shape having afirst inlet 188 open in an axial direction proximate the firstaxial end 164 and afirst outlet 192 extending along theperiphery 196 in a substantially radial direction (seeFIG. 8 ). Thefirst airflow path 180 a is shaped to smoothly transition theairflow 78 a from a substantially axial direction (e.g., into the first inlet 188) to a substantially radial direction (e.g., out of the first outlet 192). Thefirst airflow path 180 a is also enclosed by thebody 156 of theimpeller 30 along its entire length between thefirst inlet 188 and thefirst outlet 192. - The
first airflow path 180 a also includes a plurality ofvanes 200 positioned within theairflow path 180 a and extending between the firstconical surface 160 and the firstouter wall 176. Thevanes 200 are configured to accelerate thefirst airflow 78 a as it passes through thefirst airflow path 180 a. In the illustrated embodiment, thevanes 200 are swept in a direction opposite the direction of rotation of theimpeller 30. - The
second airflow path 180 b is also substantially annular in shape having asecond inlet 204 open in a substantially axial direction proximate the secondaxial end 172 and asecond outlet 208 extending along theperiphery 196 in a substantially radial direction (seeFIG. 8 ). Thesecond airflow path 180 b is shaped to smoothly transition thesecond airflow 78 b from a substantially axial direction (e.g., into the second inlet 204) to a substantially radial direction (e.g., out of the second outlet 208). Thesecond airflow path 180 b is also enclosed by thebody 156 of theimpeller 30 along its entire length between thesecond inlet 204 and thesecond outlet 208. - The
second airflow path 180 b also includes a plurality ofvanes 200 positioned within theairflow path 180 b and extending between the secondconical surface 168 and the secondouter wall 184. Thevanes 200 are configured to accelerate thesecond airflow 78 b as it passes through thesecond airflow path 180 b. In the illustrated embodiment, thevanes 200 are swept in a direction opposite the direction of rotation of theimpeller 30. - Proximate each
outlet conical wall portion recess 210 receiving the associatedouter wall impeller 30. With this arrangement, the inner surface of eachouter wall conical wall portion airflows transition region 106. Likewise, the surface of eachinlet outer wall airflows outlets impeller 30 are positioned axially closer to the midpoint of the axial height of thechannel region 102 than the chamber inlet 152 (with theupper outlet 192 being closest to the midpoint). - The
impeller 30 also defines acoupling portion 212 proximate the firstaxial end 164 and including anannular ridge 216 formed by thebody 156 to define anaperture 218. In the illustrated embodiment, theannular ridge 216 includes a substantially hemispherical outer contour (seeFIG. 7 ). Theridge 216 also defines a plurality of radially orientedgrooves 220 spaced (e.g., equally) about the circumference. - The
impeller 30 also defines asupport boss 232 aligned with theaxis 34 and positioned proximate the secondaxial end 172. Thesupport boss 232 is configured to receive at least a portion of the bearing 132 positioned in thebearing boss 128. Thesupport boss 232 and thebearing boss 128 cooperate to position theimpeller 30 within the central region of theimpeller housing 22. - Illustrated in
FIGS. 5A-5B and 9-10 , theblower 10 also includes acoupler 228 coupled to and extending between theoutput shaft 62 of theengine 18 and thecoupling portion 212 of theimpeller 30. Thecoupler 228 is configured transmit torque between theshaft 62 and theimpeller 30 so that the two elements to rotate together as a unit. Thecoupler 228 is also configured to allow some movement/misalignment between theoutput shaft 62 and theimpeller 30. In the illustrated embodiment, thecoupler 228 and thebearing boss 128 define the location of theimpeller 30 within theimpeller housing 22. The illustrated coupling arrangement may allow for a modular assembly theengine 18 may be separated from theimpeller housing 22. - The
coupler 228 includes acentral hub 236, asemi-spherical hood 240 extending radially outwardly from thehub 236, and a plurality of ribs 244 extending between thehub 236 and thehood 240. The shape of theannular ridge 216 substantially corresponds to the inner shape of thehood 240. Thegrooves 220 on thecoupling portion 218 and ribs 244 are sized, spaced and oriented to facilitate engagement. - The
output shaft 62 of theengine 18 is rotatably coupled to a threaded aperture defined by thehub 236. Thecoupler 228 is connected to thecoupling portion 212 of theimpeller 30. Thecoupling portion 212 is at least partially inserted into the space formed between thehood 240 and thehub 236 such that thehub 236 is at least partially positioned within theaperture 218 of theridge 216 and each rib 244 is at least partially received within a corresponding one of thegrooves 220. As shown inFIGS. 5A-5B , the outer surface of thehood 240 merges into the outer surface of theimpeller 30. Once assembled, thecoupling portion 212 engages with and interlocks with thecoupler 228 allowing thecoupler 228 andimpeller 30 to rotate as a unit. - As best illustrated in
FIG. 10 , the ribs 244 of thecoupler 228 are positioned such that anaxis 248 of each rib 244 does not pass through the axis 34 (e.g., is non-radial). Rather, each rib 244 and eachrib axis 248 is offset from a radial orientation. As illustrated, each rib 244 and eachaxis 248 extends generally tangentially to a circle about theaxis 34. The illustrated configuration of thecoupler 228 may improve connection between theoutput shaft 62 and theimpeller 30 and reduce noise produced during operation. - While the
coupler 228 is shown being attached to thedrive shaft 62 with the ribs 244 engaging theimpeller 30, it should be understood that, in alternative embodiments (not shown), thecoupler 228 may be attached to theimpeller 30 with the ribs 244 engaging thedrive shaft 62. - To operate the
blower 10, the user starts theengine 18, and theengine 18 rotates theoutput shaft 62 which, in turn, causes thecoupler 228 to rotate. Thecoupler 228 then transmits the torque of theengine 18 to theimpeller 30 via the engagement between the ribs 244 and thegrooves 220. As such, theimpeller 30 and theoutput shaft 62 rotate together as a unit about theaxis 34. - Rotation of the
impeller 30 draws inseparate airflows impeller housing 22. Thefirst airflow 78 a is drawn into thefirst inlet 188 of theimpeller 30 via thefirst inlet 66 of theimpeller housing 22. Thefirst airflow 78a is then accelerated by thevanes 200 in thefirst airflow path 180 a and exhausted radially through thefirst outlet 192 and into thetransition region 106. - Simultaneously, the
second airflow 78 b is drawn into thesecond inlet 204 of theimpeller 30 via thesecond inlet 70 of theimpeller housing 22. Thesecond airflow 78 b is then accelerated by thevanes 200 in thesecond airflow path 180 b and exhausted radially through thesecond outlet 208 and into thetransition region 106. - After exiting the
impeller 30, the twoairflows impeller 30. The combined airflow then continues to travel radially outwardly through thetransition region 106 where it enters thechannel region 102 of theblower volume 26. - In the
channel region 102, the combined airflow originates proximate point A and travels in a counter clockwise-direction (inFIG. 6 ) along thechannel region 102 and toward theoutlet 74. As the airflow travels along thechannel region 102, additional air is added tochannel region 102 via theinlet 152 along the entire length of thechannel region 102. As such, the volume of air increases as it travels along the length of thechannel region 102 and is accommodated by the increasing cross-sectional area of thechannel region 102. After the combined airflow reaches theoutlet 74, the combined airflow enters theexhaust nozzle 154 which, as described above, tapers (e.g., the cross-sectional area decreases) and accelerates the combined airflow before it exits theblower 10. -
FIGS. 11-13 illustrate another embodiment of theimpeller housing 22′. Theimpeller housing 22′ is substantially similar to theimpeller housing 22, as described above, and only differences will be described herein. - The
impeller housing 22′ includes an exhaust duct ortube 252′ coupled to theoutlet 74′ and configured to convey the combined airflow therethrough. Theexhaust duct 252′ includes a bellows orflexible portion 260′ coupled to theoutlet 74′ and arigid portion 264′ coupled to and extending from theflexible portion 260′ to anexhaust port 268′. During use, the combined airflow enters theflexible portion 260′ of theexhaust duct 252′ via theoutlet 74′, flows through the flexible andrigid portions 260′, 264′, and is exhausted through theexhaust port 268′. - As illustrated in
FIG. 13 , theflexible portion 260′ of theexhaust duct 252′ is substantially elongated in shape being formed from anouter wall 274′ having afirst end 276′, an oppositesecond end 280′, and at least partially defining achannel 256′ therethrough. During use, thefirst end 276′ of theflexible portion 260′ is movable relative to thesecond end 280′ while generally maintaining the cross-sectional shape and the integrity of thechannel 256′ thus assuring that air entering thefirst end 276′ is directed and passes through thesecond end 280′. - The
outer wall 274′ of theflexible portion 260′ is generally formed from a resilient and flexible material, such as rubber, etc. Theouter wall 274′ has a serpentine shape and includes a flexible region or bellowsportion 284′ with a plurality ofribs 282′ to permit theouter wall 274′ to expand, contract, and elastically deform. - In the illustrated implementation, the smallest cross-sectional area formed by the
flexible region 284′ of theouter wall 274′ is at least as large as the cross-sectional area of thefirst end 276′ of theflexible portion 260′. As such, theflexible region 284′ does not restrict the flow of air therethrough. Proximate its inlet, theflexible region 284′ has a non-circular cross-sectional shape. In particular, the inlet of theflexible region 284′ is substantially oval in shape. - Furthermore, the
flexible portion 260′ and the smallest cross-sectional area of theflexible region 284′ have a cross-sectional shape substantially similar to the cross-sectional shape of theoutlet 74′ of theimpeller housing 22′, that is, having a height that is greater than its width. By having a cross-sectional shape that is similar to that of theoutlet 74′, theflexible portion 260′ reduces pressure head loss during operation. - The
rigid portion 264′ of theexhaust duct 252′ is substantially tubular in shape having abody 286′ with afirst end 288′ and an oppositesecond end 292′ forming theexhaust port 268′. Thebody 286′ of therigid portion 264′ also defines asecond channel 290′ extending therethrough and open to theexhaust port 268′. Thefirst end 288′ of therigid portion 264′ is coupled to thesecond end 280′ of theflexible portion 260′ causing thesecond channel 290′ to be in fluid communication with thefirst channel 256′. - In the illustrated embodiment, the
body 286′ of therigid portion 264′ transitions in cross-sectional shape from thefirst end 288′ to thesecond end 292′. Thefirst end 288′ has a cross-sectional shape substantially similar to the cross-sectional shape of thesecond end 280′ of theflexible portion 260′ (e.g., non-circular or oval) and, likewise, to the cross-sectional shape of theoutlet 74′ of theimpeller housing 22′. Thesecond end 292′ of therigid portion 264′ is substantially circular in cross-sectional shape and has a cross-sectional area less than the cross-sectional area of thefirst end 288′. As such, therigid portion 264′ of theexhaust duct 252′ accelerates the airflow as it passes therethrough. - Although the invention has been described in detail with reference to certain preferred constructions, variations and modifications exist within the scope and spirit of one or more independent aspects of the invention as described.
- One or more independent features and/or independent advantages of the invention may be set forth in the claims.
Claims (7)
Priority Applications (1)
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US17/486,343 US20220010798A1 (en) | 2017-10-10 | 2021-09-27 | Backpack blower |
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Application Number | Priority Date | Filing Date | Title |
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US201762570584P | 2017-10-10 | 2017-10-10 | |
US16/003,924 US11156224B2 (en) | 2017-10-10 | 2018-06-08 | Backpack blower |
US17/486,343 US20220010798A1 (en) | 2017-10-10 | 2021-09-27 | Backpack blower |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US16/003,924 Division US11156224B2 (en) | 2017-10-10 | 2018-06-08 | Backpack blower |
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US20220010798A1 true US20220010798A1 (en) | 2022-01-13 |
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ID=63833847
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Application Number | Title | Priority Date | Filing Date |
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US16/003,924 Active 2039-01-09 US11156224B2 (en) | 2017-10-10 | 2018-06-08 | Backpack blower |
US17/486,343 Abandoned US20220010798A1 (en) | 2017-10-10 | 2021-09-27 | Backpack blower |
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US16/003,924 Active 2039-01-09 US11156224B2 (en) | 2017-10-10 | 2018-06-08 | Backpack blower |
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US (2) | US11156224B2 (en) |
EP (4) | EP3536969B1 (en) |
CN (3) | CN113431796B (en) |
AU (2) | AU2018214034A1 (en) |
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Also Published As
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CN109654044B (en) | 2021-07-16 |
CN113431797A (en) | 2021-09-24 |
EP3470684B1 (en) | 2022-04-06 |
EP3536971A1 (en) | 2019-09-11 |
EP3470684A2 (en) | 2019-04-17 |
US20190104694A1 (en) | 2019-04-11 |
CN113431797B (en) | 2023-09-19 |
CN113431796B (en) | 2022-07-19 |
EP3536969A1 (en) | 2019-09-11 |
CN113431796A (en) | 2021-09-24 |
EP3536971B1 (en) | 2021-05-19 |
AU2018102142A4 (en) | 2019-11-21 |
US11156224B2 (en) | 2021-10-26 |
CN109654044A (en) | 2019-04-19 |
EP3536970A1 (en) | 2019-09-11 |
EP3470684A3 (en) | 2019-07-03 |
AU2018214034A1 (en) | 2019-05-02 |
EP3536970B1 (en) | 2022-05-18 |
EP3536969B1 (en) | 2020-12-02 |
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