US20180163747A1 - Blower and vacuum cleaner - Google Patents
Blower and vacuum cleaner Download PDFInfo
- Publication number
- US20180163747A1 US20180163747A1 US15/576,338 US201515576338A US2018163747A1 US 20180163747 A1 US20180163747 A1 US 20180163747A1 US 201515576338 A US201515576338 A US 201515576338A US 2018163747 A1 US2018163747 A1 US 2018163747A1
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- US
- United States
- Prior art keywords
- radial direction
- flow path
- face
- stator
- impeller
- 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
- F04D29/40—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
-
- 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
-
- 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
- A47L9/28—Installation of the electric equipment, e.g. adaptation or attachment to the suction cleaner; Controlling suction cleaners by electric means
- A47L9/2836—Installation of the electric equipment, e.g. adaptation or attachment to the suction cleaner; Controlling suction cleaners by electric means characterised by the parts which are controlled
- A47L9/2842—Suction motors 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
- F04D25/00—Pumping installations or systems
- F04D25/02—Units comprising pumps and their driving means
- F04D25/06—Units comprising pumps and their driving means the pump being electrically driven
- F04D25/0606—Units comprising pumps and their driving means the pump being electrically driven the electric motor being specially adapted for integration in the pump
-
- 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
- F04D25/082—Units comprising pumps and their driving means the working fluid being air, e.g. for ventilation the unit having provision for cooling the motor
-
- 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
-
- 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
- F04D29/58—Cooling; Heating; Diminishing heat transfer
-
- 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
- F04D29/58—Cooling; Heating; Diminishing heat transfer
- F04D29/5806—Cooling the drive system
-
- 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
- F04D29/58—Cooling; Heating; Diminishing heat transfer
- F04D29/582—Cooling; Heating; Diminishing heat transfer specially adapted for elastic fluid pumps
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/12—Stationary parts of the magnetic circuit
- H02K1/14—Stator cores with salient poles
- H02K1/146—Stator cores with salient poles consisting of a generally annular yoke with salient poles
- H02K1/148—Sectional cores
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K21/00—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets
- H02K21/12—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets
- H02K21/14—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets with magnets rotating within the armatures
- H02K21/16—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets with magnets rotating within the armatures having annular armature cores with salient poles
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K5/00—Casings; Enclosures; Supports
- H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
- H02K5/20—Casings or enclosures characterised by the shape, form or construction thereof with channels or ducts for flow of cooling medium
- H02K5/207—Casings or enclosures characterised by the shape, form or construction thereof with channels or ducts for flow of cooling medium with openings in the casing specially adapted for ambient air
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
- H02K7/14—Structural association with mechanical loads, e.g. with hand-held machine tools or fans
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K9/00—Arrangements for cooling or ventilating
- H02K9/14—Arrangements for cooling or ventilating wherein gaseous cooling medium circulates between the machine casing and a surrounding mantle
Definitions
- the present disclosure relates to a blower and a vacuum cleaner.
- a blower includes a rotor that has a shaft disposed following a central axis extending vertically, a stator positioned at an outer side of the rotor in a radial direction, a cylindrical housing extending in the axial direction and accommodating the rotor and the stator, and an impeller attached to the shaft, at an upper side from the stator.
- the stator includes a ring-shaped core back portion, plurality of teeth portions extending from the core back portion toward an inner side in the radial direction, an insulator that covers at least part of the teeth portions, a coil wound on each of the teeth portions via the insulator, and a flow path forming member of which at least part is positioned further at an inner side in the radial direction than the core back portion.
- the housing has a through hole that opens to the inner side.
- the flow path forming member connects part of the insulator or the coil at one side in the circumferential direction and part of the insulator or the coil at another side in the circumferential direction, and forms a flow path that passes further at an inner side in the radial direction than the core back portion.
- the flow path connects to the through hole of the housing.
- FIG. 1 is a perspective view illustrating a blower according to the present embodiment.
- FIG. 2 is a cross-sectional diagram illustrating a blower according to an embodiment.
- FIG. 3 is a disassembled perspective view of the blower according to the embodiment.
- FIG. 4 is a perspective view, viewing a motor according to the embodiment from the lower side.
- FIG. 5 is a perspective view of a stator according to the embodiment.
- FIG. 6 is a disassembled perspective view illustrating the stator, a sensor board, and a lower lid.
- FIG. 7 is a plane cross-sectional view of the blower.
- FIG. 8 is an explanatory diagram illustrating a mounting arrangement of a rotary sensor.
- FIG. 9 is a partial cutaway perspective view of an exhaust air guide member.
- FIG. 10 is a partial enlarged cross-sectional view illustrating a first guide path of the blower according to the present embodiment.
- FIG. 11 is a partial enlarged cross-sectional view illustrating a second guide path of the blower according to the present embodiment.
- FIG. 12 is a plan view of moving blades of the impeller.
- FIG. 13 is a side view illustrating the blower according to the present embodiment.
- FIG. 14 is a cross-sectional view illustrating an exhaust air guide hole (flow path) according to the present embodiment.
- FIG. 15 is a cross-sectional view illustrating an exhaust air guide hole (flow path) according to another example.
- FIG. 16 is a plane cross-sectional view of a blower according to a first modification.
- FIG. 18 is a plan view of a stator according to the second modification.
- FIG. 19 is a plan view of a core piece according to the second modification.
- FIG. 20 is a cross-sectional view of another example of the blower according to the second modification in FIG. 17 .
- FIG. 21 is a perspective view illustrating a vacuum cleaner that has the blower.
- an XYZ coordinate system will be illustrated as a three-dimensional orthogonal coordinate system as appropriate.
- a Z-axis direction is a direction parallel to an axial direction along a central axis J illustrated in FIG. 1 .
- a Y-axis direction is a direction orthogonal to the Z-axis direction and is a right-left direction in FIG. 2 .
- An X-axis direction is a direction that is orthogonal to both of the Y-axis direction and the Z-axis direction.
- a direction (the Z-axis direction) in which the central axis J extends will be referred to as a vertical direction.
- the positive side in the Z-axis direction (+Z side) will be referred to as the “upper side (upper side in the axial direction)” and the negative side in the Z-axis direction ( ⁇ Z side) will be referred to as the “lower side (lower side in the axial direction)”.
- the vertical direction, the upper side, and the lower side are terms that are used simply for the purpose of description and do not limit the actual positional relationship or direction.
- a direction (the Z-axis direction) parallel to the central axis J will be simply referred to as an “axial direction”
- a radial direction of which the central axis J is the center will be simply referred to as a “radial direction”
- a circumferential direction around the central axis J will be simply referred to as a “circumferential direction”.
- FIG. 1 is a perspective view illustrating a blower 1 according to the present embodiment.
- FIG. 2 is a cross-sectional diagram illustrating a blower 1 according to the present embodiment.
- FIG. 3 is a disassembled perspective view of the blower 1 according to the present embodiment, excluding a control board 11 and board case 15 .
- a blower 1 includes a motor 10 , an impeller 70 , an exhaust air guide member 60 , an impeller housing 80 , a control board 11 , and a board case 15 , as illustrated in FIG. 1 through FIG. 3 .
- the motor 10 has a rotor 30 and stator 40 , which will be described later, so the blower 1 has the rotor 30 , the stator 40 , a housing 20 , and the impeller 70 .
- the exhaust air guide member 60 is attached to the upper side (+Z side) of the motor 10 .
- the impeller housing 80 is attached to the upper side of the exhaust air guide member 60 .
- the impeller 70 is accommodated between the exhaust air guide member 60 and impeller housing 80 .
- the impeller 70 is attached to the motor 10 rotatably on the central axis J.
- the control board 11 , and the board case 15 that covers the control board 11 are attached on the lower side ( ⁇ Z side) of the motor 10 .
- FIG. 4 is a perspective view, viewing a motor 10 according to the present embodiment from the lower side.
- the motor 10 includes the housing 20 , a lower lid 22 , the rotor 30 that has a shaft 31 , the stator 40 , a sensor board 50 , a lower-side bearing 52 a , and an upper-side bearing 52 b , as illustrated in FIG. 2 and FIG. 4 .
- the housing 20 is a cylindrical covered container accommodating the rotor 30 and stator 40 . More specifically, the housing 20 is a cylindrical form extending in the axial direction, and accommodates the rotor 30 and stator 40 .
- the housing 20 has a peripheral wall 21 that is cylindrical in shape, an upper lid portion 23 positioned at the upper end of the peripheral wall 21 , and an upper-side bearing holding portion 27 positioned at the middle portion of the upper lid portion 23 .
- the stator 40 is fixed on the inner side face of the housing 20 .
- the upper-side bearing holding portion 27 is a cylinder protruding toward the upper side from the middle portion of the upper lid portion 23 .
- the upper-side bearing holding portion 27 holds the upper-side bearing 52 b within.
- Multiple through holes 25 and 26 are provided at an edge portion 21 a of the peripheral wall 21 of the housing 20 and upper lid portion 23 , as illustrated in FIG. 3 . That is to say, the housing 20 has through holes 25 and 26 that open to the inner side. Three through holes 25 and three through holes 26 are positioned alternately around the axis (see FIG. 7 ). The through holes 25 and 26 reach from the upper side of the peripheral wall 21 to the outer edge of the upper lid portion 23 . The through holes 25 and 26 pass through the peripheral wall 21 in the radial direction. The through holes 25 and 26 also pass through the upper lid portion in the vertical direction near the outer edge thereof in the radial direction.
- the lower lid 22 is attached to an opening at the lower side ( ⁇ Z side) of the housing 20 .
- a cylindrical lower-side bearing holding portion 22 c that protrudes toward the lower side from the lower face of the lower lid 22 is provided to the middle portion of the lower lid 22 .
- the lower-side bearing holding portion 22 c holds the lower-side bearing 52 a.
- the rotor 30 has the shaft 31 , a rotor magnet 33 , a lower-side magnet fixing member 32 , and an upper-side magnet fixing member 34 , as illustrated in FIG. 2 . That is to say, the rotor 30 has the shaft 31 .
- the rotor magnet 33 has a cylindrical shape encompassing the shaft 31 around the axis ( ⁇ z direction) at the outer side in the radial direction.
- the lower-side magnet fixing member 32 and upper-side magnet fixing member 34 are cylindrical shapes, having an outer diameter equivalent to that of the rotor magnet 33 .
- the lower-side magnet fixing member 32 and upper-side magnet fixing member 34 are attached to the shaft 31 , sandwiching the rotor magnet 33 from both sides in the axial direction.
- the upper-side magnet fixing member 34 has a minor radius portion 34 a that is smaller in diameter than the lower side (rotor magnet 33 side).
- the shaft 31 is disposed following the central axis J that extends vertically.
- the shaft 31 is rotatably supported around the axis ( ⁇ z direction) by the lower-side bearing 52 a and upper-side bearing 52 b .
- the impeller 70 is attached to the end of the shaft 31 at the upper side (+Z side). The impeller 70 integrally rotates with the shaft 31 on the axis.
- the stator 40 is positioned on the outer side from the rotor 30 in the radial direction.
- the stator 40 encompasses the rotor 30 around the axis ( ⁇ z direction).
- the stator 40 has a stator core 41 , multiple (three) upper-side insulators 43 , multiple (three) lower-side insulators 44 , and coils 42 , as illustrated in FIG. 5 and FIG. 6 .
- the stator core 41 includes a core back portion 41 a and multiple teeth portions 41 b , as illustrated in FIG. 5 .
- the stator 40 also has a molded portion (flow path forming member) 47 in which the coils 42 are embedded.
- the stator 40 has the core back portion 41 a , teeth portions 41 b , insulators, coils 42 , and flow path forming member.
- the insulators in the present embodiment correspond to the upper-side insulators 43 and lower-side insulators 44 .
- the flow path forming member corresponds to the molded portion 47 .
- the stator core 41 includes the ring-shaped core back portion 41 a and multiple (three) teeth portions 41 b extending inward in the radial direction from the core back portion 41 a , as illustrated in FIG. 6 .
- the core back portion 41 a is ring-shaped around the central axis.
- the core back portion 41 a has a configuration where linear portions 41 c at three positions around the axis, and three arc portions 41 d , are alternatingly positioned.
- the teeth portions 41 b each extend inward in the radial direction from the inner peripheral faces of the linear portions 41 c .
- the teeth portions 41 b are disposed equidistantly following the circumferential direction.
- Inclined members 46 that guide exhaust air to the inner side of the stator 40 are each disposed at the upper faces of arc portions 41 d of the core back portion 41 a .
- the inclined members 46 each have a shape where the thickness progressively becomes smaller from the outer side in the radial direction toward the inner side in the radial direction.
- the insulators cover at least part of the teeth portions 41 b . Also, the coils 42 are wound on each of the teeth portions 41 b via the insulators (upper-side insulators 43 and lower-side insulators 44 ).
- the upper-side insulators 43 are insulating members covering part of the upper face and side faces of the stator core 41 .
- the upper-side insulators 43 are provided corresponding to each of the three teeth portions 41 b .
- the upper-side insulators each have an upper-side outer peripheral wall portion 43 a positioned at the upper side from the core back portion 41 a , an upper-side inner peripheral wall portion 43 e positioned at the upper side from the tip of the teeth portion 41 b , and an upper-side insulating portion 43 d that links the upper-side outer peripheral wall portion 43 a and upper-side inner peripheral wall portion 43 e in the radial direction, and that is positioned at the upper side of a portion of the teeth portion 41 b where the coil 42 is wound.
- the upper-side insulators 43 and lower-side insulators 44 sandwich the teeth portions 41 b of the stator core 41 in the vertical direction.
- the coils 42 are wound on the teeth portions 41 b covered by the upper-side insulating portions 43 d of the upper-side insulators 43 and the lower-side insulating portions 44 b of the lower-side insulators 44 .
- the upper-side outer periphery wall portion 43 a has a first side face 43 b and second side face 43 c at both ends thereof in the circumferential direction.
- the first side face 43 b is an inclined face that is inclined as to the radial direction and faces the outer side in the radial direction.
- the second side face 43 c is an inclined face that is inclined as to the radial direction and faces the inner side in the radial direction.
- a flat face 43 f and an upper-side inclined protruding portion 43 g are provided in tandem in the circumferential direction at a portion of the outer peripheral faces of the upper-side outer peripheral wall portion 43 a positioned above the linear portion 41 c .
- the flat face 43 f is positioned at a second side face 43 c side
- the upper-side inclined protruding portion 43 g is positioned at a first side face 43 b .
- An arc-shaped face that is disposed following the inner peripheral face of the housing 20 is disposed between the flat face 43 f and the second side face 43 c .
- the outer peripheral face of the upper-side inclined protruding portion 43 g is an arc-shaped face following the inner peripheral face of the housing 20 .
- the flat face 43 f extends in the axial direction, matching the outer peripheral face of the linear portion 41 c of the stator core 41 .
- the upper-side inclined protruding portion 43 g protrudes to the outer side in the radial direction as to the flat face 43 f .
- the upper-side inclined protruding portion 43 g also protrudes toward the lower side in the axial direction, and covers part of the linear portion 41 c of the stator core 41 from the outer side in the radial direction.
- An axial-direction flat face 43 j , and an upper-side guide inclined face 43 h positioned at the lower side from the axial-direction flat face 43 j are provided on the side face of the upper-side inclined protruding portion 43 g that is adjacent to the flat face 43 f .
- the upper-side guide inclined face 43 h gradually inclines in a direction facing the lower side the farther toward the lower side it is.
- the axial-direction flat face 43 j and upper-side guide inclined face 43 h are smoothly connected.
- the inclination direction of the upper-side guide inclined face 43 h is the same direction as the rotational direction of the impeller. Accordingly, the swirling component of exhaust air flowing through air flow paths FP is smoothly directed toward the lower side by the upper-side guide inclined face 43 h and a later-described lower-side guiding inclined face 44 h .
- the venting efficiency of exhaust air flowing through the air flow paths FP can be improved.
- the upper-side outer peripheral wall portions 43 a that are adjacent in the circumferential direction are separated by predetermined gaps, as illustrated in FIG. 7 .
- the first side face 43 b of one upper-side outer periphery wall portion 43 a and the second side face 43 c of the other upper-side outer periphery wall portion 43 a are disposed facing each other in the circumferential direction.
- the degree of inclination of the first side face 43 b as to the radial direction and the degree of inclination as to the radial direction of the second side face 43 c differ.
- the width in the circumferential direction of an opening portion 90 at the outer side in the radial direction of a gap CL formed between adjacent upper-side outer periphery wall portions 43 a is narrower than the width in the circumferential direction of an opening portion 91 at the inner side in the radial direction.
- the inclined members 46 disposed above the core back portion 41 a (see FIG. 6 ).
- the inclined members 46 are sandwiched between the first side faces 43 b and second side faces 43 c .
- the gaps CL are positioned on the inner side of the through holes 26 of the housing 20 .
- the through holes 26 and the gaps CL are air flow paths that guide exhaust air flowing in from the outer side of the housing 20 to the inner side of the stator 40 .
- the direction of inclination of the gaps CL as to the radial direction as viewed from above matches the direction of flow of exhaust air discharged from the exhaust air guide member 60 in the circumferential direction. That is to say, this matches the rotational direction of the impeller 70 .
- Forming the opening portions 90 at the inlet side of the gaps CL relatively larger than the opening portions 91 at the outlet side, as illustrated in FIG. 7 enables more exhaust air to be suctioned into the gaps CL from the through holes 26 , and relatively narrowing the width of the opening portions 91 at the outlet side enables the air discharged from the gaps CL to be caused to flow toward target positions (coils 42 ) more accurately.
- the three lower-side outer peripheral wall portions 44 a positioned at the lower side from the core back portion 41 a encompass the coils 42 at the lower side of the stator core 41 from the outer side in the radial direction, as illustrated in FIG. 6 . Although there are gaps between lower-side outer peripheral wall portions 44 a that are adjacent in the circumferential direction, the lower-side outer peripheral wall portions 44 a may be in contact with each other in the circumferential direction.
- the portions positioned at the lower side from the linear portions 41 c of the core back portion 41 a each have a flat face 44 d and a lower-side inclined protruding portion 44 g provided in tandem in the circumferential direction. Both sides in the circumferential direction of the region where the flat face 44 d and lower-side inclined protruding portion 44 g are provided, are provided with arc-shaped faces disposed following the inner peripheral face of the housing 20 .
- the flat face 44 d extends in the axial direction matching the outer peripheral face of the linear portion 41 c.
- the lower-side inclined protruding portion 44 g protrudes towards the outer side in the radial direction with regard to the flat face 44 d .
- the lower-side inclined protruding portion 44 g also covers part of the linear portion 41 c of the stator core 41 protruding toward the upper side in the axial direction.
- An axial-direction flat face 44 j , and a lower-side guiding inclined face 44 h positioned at the upper side from the axial-direction flat face 44 j are disposed on a side face of the lower-side inclined protruding portion 44 g adjacent to the flat face 44 d .
- the lower-side guiding inclined face 44 h gradually inclines in a direction facing toward the upper side the closer to the upper side it is.
- the axial-direction flat face 44 j and lower-side guiding inclined face 44 h are smoothly connected.
- the direction of inclination of the lower-side guiding inclined face 44 h is the same direction as the rotational direction of the
- the lower-side inclined protruding portions 44 g of the lower-side insulators 44 and the upper-side inclined protruding portions 43 g of the upper-side insulators 43 are disposed in a staggered manner in the circumferential direction and axial direction, across gaps, as illustrated in FIG. 5 .
- the lower-side guiding inclined faces 44 h and upper-side guide inclined faces 43 h face each other across gaps.
- the gaps between the lower-side guiding inclined faces 44 h and upper-side guide inclined faces 43 h are part of the air flow paths FP between the stator 40 and housing 20 .
- the swirling component of exhaust air flowing through the air flow paths FP is smoothly directed toward the lower side by the lower-side guiding inclined face 44 h and upper-side guide inclined face 43 h . Accordingly, the venting efficiency of exhaust air flowing through the air flow paths FP can be improved.
- plate portions 45 that extend in the axial direction are provided to each flat face 44 d .
- the plate portions 45 are erected approximately perpendicular to the flat face 44 d .
- the tips of the plate portions 45 at the outer side in the radial direction reach the inner peripheral face of the housing 20 .
- the plate portions 45 section the region of the air flow path FP between the lower-side outer peripheral wall portion 44 a and the housing 20 into multiple regions in the circumferential direction.
- the molded portion 47 functions as a flow path forming member. That is to say, the molded portion 47 configures exhaust guide holes 48 serving as flow paths. At least part of the molded portion 47 is positioned at the inner side in the radial direction of the core back portion 41 a .
- the molded portion 47 is formed filling in a region of the stator 40 encompassed by the upper-side outer peripheral wall portions 43 a of the upper-side insulators 43 and the lower-side outer peripheral wall portions 44 a of the lower-side insulators 44 , as illustrated in FIG. 5 . Accordingly, the molded portion 47 covers the coils 42 .
- the molded portion 47 is positioned between upper-side insulators 43 , between lower-side insulators 44 , and between coils 42 , that are adjacent to each other. That is, in other words the molded portion 47 can be said to be connecting part of insulators or coils at one side in the circumferential direction and part of insulators or coils at the other side in the circumferential direction. Thus, the molded portion 47 is supported within the motor 10 .
- the molded portion 47 reaches from the upper end of the upper-side insulators 43 to the lower end of the lower-side insulators 44 .
- the molded portion 47 is also provided with a through hole 47 a through which the rotor is passed.
- the molded portion 47 encompasses and strongly supports the coils 42 , and also integrally holds the upper-side insulators 43 , lower-side insulators 44 , stator core 41 , and sensor board 50 . Accordingly, the molded portion 47 can reduce vibrations generated from the stator 40 .
- the resin material of which the molded portion 47 is configured is not restricted, as long as it has insulating properties and the coils 42 can be covered and embedded.
- the molded portion 47 may also be configured of a hot-melt material with a low melting point. In a case of configuring the molded portion 47 from a hot-melt material, the molded portion 47 can be formed using a simple mold.
- Three groove-shaped exhaust guide holes (flow paths) 48 that reach from the upper side to the lower end are provided on the outer peripheral face of the molded portion 47 .
- the groove-shaped exhaust guide holes 48 are covered from the outer side in the radial direction by the by the core back portion 41 a of the stator core 41 , partway in the vertical direction. That is to say, the exhaust guide holes 48 pass through the inner side of the core back portion 41 a in the radial direction. Also, at least part of the inner side face of the core back portion 41 a in the radial direction is exposed to the exhaust guide holes 48 .
- the core back portion 41 a can be efficiently cooled.
- the exhaust guide holes 48 have upper openings 48 a that open to the outer side in the radial direction, positioned at the upper side from the core back portion 41 a , as illustrated in FIG. 2 .
- the upper openings 48 a open to the outer side in the radial direction.
- the exhaust guide holes 48 have inclined faces 48 c that smoothly incline toward the lower side at the inner side of the upper openings 48 a in the radial direction.
- the exhaust guide holes 48 also have lower openings 48 b positioned at the lower end face of the molded portion 47 , that open to the lower side.
- the lower openings 48 b are positioned directly above the through holes 22 a of the lower lid 22 . That is to say, the molded portion 47 has the upper openings 48 a opening at the upper side from the core back portion 41 a and the lower openings 48 b opening at the lower side from the core back portion 41 a .
- the upper openings 48 a open toward the outer side in the radial direction. Accordingly, air flowing from the outer side of the core back portion 41 a can be efficiently guided into the stator 40 .
- the lower openings 48 b open toward the lower side in the axial direction. Accordingly, air heading toward the lower side in the axial direction can be discharged to the outer side of the housing 20 without changing the direction of the air flow, by the exhaust guide holes 48 formed in the axial direction.
- the exhaust guide holes 48 also connect the upper openings 48 a and lower openings 48 b . Accordingly, air is efficiently guided, and the inside of the stator 40 can be cooled, by the exhaust guide holes 48 .
- the upper openings 48 a of the exhaust guide holes 48 face the three gaps CL of the first side faces 43 b and second side faces 43 c of the upper-side insulators 43 .
- the gaps CL are connected to the through holes 26 of the housing 20 .
- the exhaust guide holes 48 connect to the through holes 26 of the housing 20 .
- air flow paths can be configured further on the inner side from the core back portion 41 a , and the inside of the stator 40 can be efficiently cooled.
- the width of the exhaust guide holes 48 matches the width of the opening portions 91 positioned on the inner side of the gaps CL in the radial direction, as illustrated in FIG. 7 .
- the exhaust guide holes 48 open from the outer peripheral face of the molded portion 47 and extend toward the lower side, as illustrated in FIG. 2 .
- the width of the exhaust guide holes 48 and the width of the opening portions 91 do not necessarily have to be the same width, and may be different widths.
- the molded portion 47 has first inclined faces 48 d and second inclined faces 48 e that make up the side walls on both sides of the exhaust guide holes 48 in the width direction.
- the first inclined faces 48 d consecutively continue with the first side faces 43 b of the upper-side insulators 43 . That is to say, the first inclined faces 48 d are positioned progressively further at the forward side in rotational direction of the impeller 70 as to the radial direction, the further toward the inner side in the radial direction.
- the second inclined faces 48 e consecutively continue with the second side faces 43 c of the upper-side insulators 43 . That is to say, the second inclined faces 48 e are positioned progressively further at the forward side in rotational direction of the impeller 70 as to the radial direction, the further toward the inner side in the radial direction. Accordingly, the molded portion 47 has inclined faces at the upper openings 48 a that are positioned in the progressively further at the forward side in rotational direction of the impeller 70 as to the radial direction, the further toward the inner side in the radial direction. Now, these inclined faces correspond to the first inclined faces 48 d and second inclined faces 48 e .
- the exhaust air has a swirling component heading in the forward side in rotational direction of the impeller 70 , so providing the first inclined faces 48 d and second inclined faces 48 e inclined in the rotational direction, as side walls making up the exhaust guide holes 48 , can raise the venting efficiency.
- Exhaust air discharged from the gaps CL to the inner side of the stator 40 in the radial direction is guided into the exhaust guide holes 48 from the upper openings 48 a , and the direction of flow is directed toward the lower side following the inclined faces 48 c . Further, the exhaust air passes through the interior of the exhaust guide holes 48 and is discharged at the lower side of the stator 40 via the lower openings 48 b .
- Providing the exhaust guide holes 48 in the molded portion 47 enables the exhaust air flowing among the coils 42 to be smoothly discharged toward the lower side without turbulence, whereby the venting efficiency can be raised. Note that in a case where the stator 40 does not have a molded portion 47 , members having the exhaust guide holes 48 may be displaced between the coils 42 .
- the lower openings 48 b may have a shape where the cross-sectional area of the flow path progressively increases toward the lower side, which will be described alter with reference to FIG. 14 . According to this configuration, air passing through the exhaust guide holes 48 flows to the lower side more smoothly, so venting efficiency can be improved.
- FIG. 14 is a cross-sectional view of an exhaust guide holes 48 , taken along line XIV-XIV in FIG. 7 .
- the molded portion 47 has a linear portion 48 f and a tapered portion 48 h positioned vertically, as side walls making up an exhaust guide hole 48 .
- the tapered portion 48 h is positioned at the lower side of the linear portion 48 f .
- a boundary portion 48 g is provided between the linear portion 48 f and tapered portion 48 h .
- the linear portion 48 f makes up a linear wall face in the vertical direction. Accordingly, the cross-sectional area of the exhaust guide hole 48 does not change along the vertical direction in the linear portion 48 f .
- the tapered portion 48 h is inclined as to the vertical direction, so that the opposing walls separate from each other the further toward the lower side.
- the flow-path cross-sectional area of the exhaust guide hole 48 progressively increases from the upper side toward the lower side at the tapered portion 48 h .
- the molded portion 47 has a tapered portion 48 h where the flow-path cross-sectional area of the exhaust guide hole 48 progressively increases from the upper side toward the lower side. Accordingly, the static pressure of the exhaust air can be gradually reduced by the time of reaching the lower opening 48 b , so occurrence of turbulence nearby the lower openings 48 b can be suppressed, and the venting efficiency of the blower 1 can be increased.
- FIG. 15 is a cross-sectional view of an exhaust guide hole 148 according to another example that can be employed in the present embodiment. Note that FIG. 15 is a cross-sectional view corresponding to FIG. 14 .
- the exhaust guide hole 148 illustrated in FIG. 15 has the same configuration as that of the above-described exhaust guide hole 48 , except for the cross-sectional shape along the vertical direction.
- the molded portion 47 in the example illustrated in FIG. 15 has a first tapered portion 148 f and a second tapered portion 148 h positioned vertically, as side walls making up an exhaust guide hole 148 .
- the second tapered portion 148 h is positioned at the lower side of the first tapered portion 148 f .
- a boundary portion 148 g is provided between the first tapered portion 148 f and second tapered portion 148 h.
- the first tapered portion 148 f is inclined as to the vertical direction, so that the opposing walls come closer to each other the further toward the lower side. Accordingly, the flow-path cross-sectional area of the exhaust guide hole 148 progressively decreases from the upper side toward the lower side at the first tapered portion 48 f .
- the molded portion 47 has a first tapered portion 148 f where the flow-path cross-sectional area of the exhaust guide hole 148 progressively decreases from the upper side toward the lower side.
- the second tapered portion 148 h is inclined as to the vertical direction, so that the opposing walls separate from each other the further toward the lower side. Accordingly, the flow-path cross-sectional area of the exhaust guide hole 148 progressively increases from the upper side toward the lower side at the second tapered portion 148 h .
- the molded portion 47 has a second tapered portion 148 h positioned at the lower side from the first tapered portion 148 f , where the flow-path cross-sectional area of the exhaust guide hole 148 progressively increases from the upper side toward the lower side.
- the exhaust guide hole 148 is narrowest at the boundary portion 148 g . Air that has flowed into the exhaust guide hole 148 is narrowed down due to increased flow-path resistance at the first tapered portion 148 f , and thereafter passes the boundary portion 148 g and flows into the second tapered portion 148 h .
- the flow-path cross-sectional area gradually increases for the air that has flowed into the second tapered portion 148 h , when heading toward the lower side. Accordingly, pressure of the air is gradually release, the flow gradually becomes gentle, and discharge is performed without separation. Accordingly, air blowing efficiency is improved.
- the sensor board 50 is disposed between the stator 40 and the lower lid 22 , as illustrated in FIG. 2 and FIG. 6 .
- the sensor board 50 has a circular ring-shaped main unit portion 50 a , and three protruding portions 50 b that protrude toward the outer side from the outer edge of the main unit portion 50 a , in a direction inclined as to the radial direction.
- the main unit portion 50 a has a through hole through which the shaft 31 is passed.
- the sensor board 50 is fixed to the lower-side insulators 44 .
- the sensor board 50 has at least three rotary sensors 51 mounted thereupon.
- the rotary sensors 51 are Hall elements, for example.
- the sensor board 50 may be electrically connected to the coils 42 .
- a driving circuit that outputs driving signals to the coils 42 may be mounted on the sensor board 50 .
- FIG. 8 is an explanatory diagram illustrating a mounting arrangement of a rotary sensor 51 .
- the rotary sensors 51 are disposed interposed between tip portions of lower-side inner peripheral wall portions 44 c that are adjacent in the circumferential direction, as illustrated in FIG. 7 and FIG. 8 .
- the three rotary sensors 51 are equidistantly disposed every 120° in the circumferential direction.
- the faces of the rotary sensors 51 on the inner side in the radial direction face the rotor magnet 33 .
- the rotor magnet 33 is disposed at the center portion of the rotor 30 in the axial direction in the case of the present embodiment. Accordingly, the rotary sensors 51 are connected to the sensor board 50 by leads 51 a of a length corresponding to the length from the sensor board 50 to the rotor magnet 33 in the axial direction.
- a mechanism that supports the rotary sensors 51 may be provided to the tip portion of the lower-side inner peripheral wall portions 44 c .
- recesses may be provided into which the rotary sensors 51 are inserted, thereby suppressing movement of the rotary sensors 51 in the radial direction.
- the rotary sensors 51 may be fixed to the lower-side inner peripheral wall portions 44 c by snap-fitting or the like.
- the lower lid 22 is attached to the opening end 20 a of the housing 20 accommodating the stator 40 and sensor board 50 , as illustrated in FIG. 4 .
- the three through holes 22 a of the lower lid 22 are at least partly positioned on the outer side in the radial direction from the outer peripheral end of the main unit portion 50 a of the sensor board 50 , as illustrated in FIG. 2 .
- the through holes 22 a serve as second vents 97 that vent the exhaust air that has passed through the exhaust guide holes 48 of the molded portion 47 toward the lower side of the motor 10 .
- the notches 22 b of the lower lid 22 are disposed approximately matching the linear portions 41 c of the stator core 41 , the flat faces 43 f of the upper-side insulators 43 , and the flat faces 44 d of the lower-side insulators 44 , as viewed in the axial direction.
- the lower-side openings 24 at the lower face of the motor 10 serve as first vents 96 that discharge exhaust air that has passed through the air flow paths FP between the stator 40 and housing 20 , as illustrated in FIG. 2 .
- FIG. 9 is a partial cutaway perspective view of the exhaust air guide member 60 from below.
- FIG. 10 and FIG. 11 are enlarged cross-sectional views illustrating part of the impeller 70 , exhaust air guide member 60 , and impeller housing 80 . Note that FIG. 10 illustrates a first guide path D 1 that will be described later, and FIG. 11 illustrates a second guide path D 2 that will be described later.
- the exhaust air guide member 60 is attached to the housing 20 of the motor 10 .
- the exhaust air guide member 60 has a disc-ring-shaped supporting member 66 a , a ring-shaped protruding portion 66 c protruding toward the upper side from the outer peripheral edge of the supporting member 66 a , a cylindrical partitioning ring 66 b extending toward the lower side from the outer peripheral edge of the supporting member 66 a , an outer periphery cylindrical portion 65 that encompasses the partitioning ring 66 b from the outer side in the radial direction, an multiple (six in the illustration) inner guide portions 67 extending toward the lower side from the lower end of the outer periphery cylindrical portion 65 .
- the supporting member 66 a has a cylindrical attachment ring 68 that extends from the lower face of the middle portion toward the lower side, and three columnar protruding portions 69 that protrude from the lower face of the supporting member 66 a toward the lower side, as illustrated in FIG. 9 .
- the three columnar protruding portions 69 had the same diameters and heights, and are equidistantly disposed every 120° in the circumferential direction.
- the columnar protruding portions 69 are hollow in the present embodiment, and each have a protruding portion through hole 69 b at the middle of an end face 69 a at the lower side that passes through in the axial direction.
- the upper-side bearing holding portion 27 of the housing 20 is inserted into the attachment ring 68 of the exhaust air guide member 60 , as illustrated in FIG. 10 .
- the lower face of the attachment ring 68 of the exhaust air guide member 60 and the end face 69 a at the lower side of the columnar protruding portions 69 come into contact with the upper face of the upper lid portion 23 of the housing 20 .
- the exhaust air guide member 60 and the motor 10 are fastened by bolts BT passed through the protruding portion through holes 69 b of the columnar protruding portions 69 and screw holes 23 a in the upper lid portion 23 .
- the partitioning ring 66 b and outer periphery cylindrical portion 65 face each other in the radial direction across a gap.
- the gap between the partitioning ring 66 b and outer periphery cylindrical portion 65 make up part of first guide paths D 1 that guide exhaust air into the motor 10 , and part of second guide paths D 2 that discharge exhaust air to the periphery of the motor 10 .
- the first guide paths D 1 are positioned at locations in the outer peripheral direction where the inner guide portions 67 have been provided, and the second guide paths D 2 are positioned between the inner guide portions 67 in the circumferential direction.
- Six each of the first guide paths D 1 and second guide paths D 2 are provided along the circumferential direction in the present embodiment.
- the multiple inner guide portions 67 each fit to the through holes 26 or through holes 25 of the housing 20 , as illustrated in FIG. 1 .
- the outer peripheral faces of the inner guide portions 67 extend in the axial direction matching the outer peripheral face of the outer periphery cylindrical portion 65 , as illustrated in FIG. 9 and FIG. 10 .
- the inner peripheral faces 67 b of the inner guide portions 67 are inclined faces inclined toward the inner side in the radial direction, the further toward the lower side they are.
- the inner side of the inner peripheral faces 67 b of the inner guide portions 67 serve as first guide paths D 1 to guide exhaust air discharged from the impeller 70 to the through holes 25 and 26 at the inner side in the radial direction.
- the inner peripheral faces 67 b of the inner guide portions 67 also is provided with multiple stator vanes 67 a extending in the vertical direction in the form of ribs.
- the stator vanes 67 a link the partitioning ring 66 b and the inner guide portion 67 in the radial direction.
- the exhaust air passing through the first guide paths D 1 is rectified between the stator vanes 67 a and is efficiently guided to the through holes 25 and 26 .
- the stator vanes 67 a may be included in the rotational direction of the impeller 70 . In this case, exhaust air including the swirling component in the rotational direction of the impeller 70 can be guided to the through holes 25 and 26 even more efficiently.
- the second guide paths D 2 that guide exhaust air discharged from the impeller 70 to the outer side in the radial direction and discharge to the outer side of the motor 10 are provided between the inner guide portions 67 in the circumferential direction, as illustrated in FIG. 9 .
- the second guide paths D 2 are positioned between an outer peripheral face 66 e of the partitioning ring 66 b and an inner peripheral face 65 a of the outer periphery cylindrical portion 65 , as illustrated in FIG. 11 .
- Third vents 95 are provided at the lower end of the second guide paths D 2 .
- the third vents 95 turn the exhaust air that has passed through the second guide paths D 2 downward, and discharge to the outer side of the motor 10 .
- This exhaust air flows between the outer peripheral face of the motor 10 and an inner peripheral face 19 a of a casing 19 that accommodates the motor 10 , and finally is discharged from a later-described final vent 17 b (see FIG. 2 ).
- the outer peripheral face 66 e of the partitioning ring 66 b has an inner-side inclined portion 66 d that progressively hangs out toward the outer side in the radial direction the closer to the lower side it is.
- the inner peripheral face 65 a of the outer periphery cylindrical portion 65 has an outer-side inclined portion 65 b where the thickness of the outer periphery cylindrical portion 65 is thinner at the lower end. Due to these inner-side inclined portion 66 d and outer-side inclined portion 65 b being provided, the second guide paths D 2 travel to the outer side in the radial direction while maintaining the width in the radial direction as they head toward the lower side.
- the cross-sectional area of the second guide paths D 2 in places perpendicular to the axial direction gradually increases the closer to the third vents 95 . Accordingly, the discharge sound of air being discharged from the third vents 95 can be reduced. Also, the discharge efficiency at the time of air being discharged from the third vents 95 is improved.
- the impeller 70 is attached to the shaft 31 at the upper side from the stator 40 .
- the impeller 70 discharges fluid suctioned from an intake port 70 a that is opened toward the upper side, toward the outer side in the radial direction via internal flow paths, as illustrated in FIG. 2 .
- the impeller 70 has an impeller main body 71 and an impeller hub 72 .
- the impeller main body 71 has a base portion 73 , multiple moving blades 74 , and a shroud 75 .
- the base portion 73 is disc-shaped, and has a through hole 73 a passing through in the axial direction at the middle portion.
- the perimeter of the through hole 73 a of the base portion 73 is an inclined portion 73 b that has a conical face shape extending at the upper side.
- the moving blades 74 are plate-shaped members curved in the circumferential direction, that extend from the inner side in the radial direction toward the outer side on the upper face of the base portion 73 .
- the moving blades 74 are disposed erected following the axial direction.
- the shroud 75 is a cylindrical shape that tapers toward the upper side in the axial direction. An opening portion at the middle of the shroud 75 is the intake port 70 a of the impeller 70 .
- the base portion 73 and shroud 75 are linked by the moving blades 74 .
- FIG. 12 is a plan view of the moving blades 74 of the impeller 70 .
- the multiple moving blades 74 are disposed following the circumferential direction ( ⁇ z direction) on the upper face of the base portion 73 , as illustrated in FIG. 12 .
- the moving blades 74 are erected perpendicularly from the upper face of the base portion 73 following the axial direction, as illustrated in FIG. 2 .
- the multiple moving blades 74 in the present embodiment include multiple (three) first moving blades 74 a , multiple (three) second moving blades 74 b , and multiple (six) third moving blades 74 c .
- the three first moving blades 74 a are disposed at equidistantly every 120° in the circumferential direction.
- the second moving blades 74 b are each disposed between first moving blades 74 a adjacent in the circumferential direction.
- the three second moving blades 74 b are also disposed equidistantly every 120° in the circumferential direction.
- the third moving blades 74 c are each disposed between first moving blades 74 a and second moving blades 74 b adjacent in the circumferential direction.
- the six third moving blades 74 c are disposed equidistantly every 60° in the circumferential direction.
- the moving blades 74 extend on the upper face of the base portion 73 having a curvature in plan view (XY plane view). One end of the moving blades 74 is positioned on an outer edge of the base portion 73 . The other end of each moving blade 74 is positioned on the inner side of the outer edge of the base portion 73 in the radial direction.
- each of the first moving blades 74 a , the second moving blades 74 b , and the third moving blades 74 c at the outer side in the radial direction, are all positioned on the outer edge of the base portion 73 .
- end portions P 1 of the first moving blades 74 a on the inner side are positioned closest to the center of the base portion 73 .
- End portions P 2 of the second moving blades 74 b on the inner side are positioned on the outer side in the radial direction from the end portions P 1 of the first moving blades 74 a .
- End portions P 3 of the third moving blades 74 c on the inner side are positioned further on the outer side in the radial direction from the end portions P 2 of the second moving blades 74 b.
- the first moving blades 74 a , the second moving blades 74 b , and the third moving blades 74 c each have a shape that is curved like a bow in a counterclockwise direction.
- the first moving blades 74 a are each formed of four arcs that are different in radius of curvature.
- a projecting blade face 74 d of the first moving blades 74 a has three inflection points CP 11 , CP 12 , and CP 13 , in the longitudinal direction.
- the second moving blades 74 b are each formed of three arcs that are different in radius of curvature.
- a projecting blade face 74 e of the second moving blades 74 b has two inflection points CP 21 and CP 22 in the longitudinal direction.
- the third moving blades 74 c are each formed of two arcs that are different in radius of curvature.
- a projecting blade face 74 f of the third moving blades 74 c has one inflection point CP 31 in the longitudinal direction.
- the inflection point CP 11 of each first moving blade 74 a , the inflection point CP 21 of each second moving blade 74 b , and the inflection point CP 31 of each third moving blade 74 c are each disposed at the same radius position C 1 on the base portion 73 .
- the radius of curvature of a portion of each first moving blade 74 a that is further on the outer side of the radial position C 1 is the same as each other.
- the radius of curvature of a portion of each second moving blade 74 b that is further on the outer side of the radial position C 1 is the same as each other.
- the radius of curvature of a portion of each third moving blade 74 c that is further on the outer side of the radial position C 1 are the same as each other.
- each first moving blade 74 a the inflection point CP 12 of each first moving blade 74 a , the inflection point CP 22 of each second moving blade 74 b , and the end portion P 3 of each third moving blade 74 c are each disposed at the same radius position C 2 on the base portion 73 .
- each first moving blade 74 a that is disposed between the radial position C 1 and the radial position C 2
- the radius of curvature of a portion of each third moving blade 74 c that is disposed between the radial position C 1 and the radial position C 2 are the same as each other.
- each first moving blade 74 a and the end portion P 2 of each second moving blade 74 b are disposed at the same radius position C 3 on the base portion 73 . Further, the radius of curvature of a portion of each first moving blade 74 a that is disposed between the radial position C 2 and the radial position C 3 and the radius of curvature of a portion of each second moving blade 74 b disposed between the radial position C 2 and the radial position C 3 are the same as each other.
- the radius of curvature of the blade faces 74 d to 74 f of the moving blades 74 ( 74 a through 74 c ) in the present embodiment are different for each region of the impeller 70 in the radial direction. Meanwhile, portions of different types of moving blades (the first moving blades 74 a through third moving blades 74 c ) that belong to the same region in the radial direction are set to have the same radius of curvature.
- the radial position C 3 agrees with the intake port 80 a of the impeller housing 80 as seen in the axial direction. Accordingly, only the portions of the first moving blades 74 a further on the inner side than the inflection point CP 13 are disposed inward of the intake port 80 a.
- the impeller hub 72 includes a cylindrical portion 72 a that extends in the axial direction, a disc-shaped flange portion 72 b that extends outwards in the radial direction from the lower portion of the outer face of the cylindrical portion 72 a , and multiple projecting portions 72 c that protrude upwards from the upper face of the flange portion 72 b .
- the cylindrical portion 72 a includes a tapered inclined face portion 72 d that becomes tapered toward the tip portion at the upper side.
- the impeller hub 72 is attached to the impeller main body 71 by inserting the cylindrical portion 72 a into the through hole 73 a of the base portion 73 from the lower side.
- the cylindrical portion 72 a may be press-fitted into the through hole 73 a , or may be fixed using an adhesive agent or the like.
- the flange portion 72 b of the impeller hub 72 supports the impeller main body 71 from the lower side.
- the projecting portions 72 c on the flange portion 72 b are fitted into recesses 73 c on the lower face of the base portion 73 . Fitting the projecting portions 72 c into the recesses 73 c suppresses relative movement of the impeller main body 71 and the impeller hub 72 in the circumferential direction.
- the flange portion 72 b can support the impeller main body 71 over a wide area in the radial direction from below. Accordingly, the impeller 70 can be held in a stable manner, and stability at the time of high-speed rotation is increased.
- the inclined face portion 72 d at the tip of the cylindrical portion 72 a of the impeller hub 72 and the inclined face portion 73 b of the base portion 73 are smoothly connected to each other in the vertical direction in the impeller 70 .
- the inclined face portion 72 d and the inclined face portion 73 b make up a ring-shaped inclined face 70 b that guides fluid suctioned from the intake port 70 a of the impeller 70 to the outer side in the radial direction.
- Configuring the ring-shaped inclined face 70 b from the impeller main body 71 and the impeller hub 72 enables the maximum height of the ring-shaped inclined face 70 b to be increased by increasing the length of the cylindrical portion 72 a (inclined face portion 72 d ) without increasing the height of the inclined face portion 73 b of the base portion 73 . Accordingly, a ring-shaped inclined face 70 b having a preferable shape can be realized while suppressing increase in thickness of the base portion 73 .
- the impeller hub 72 is preferably made of metal.
- the shaft 31 and the impeller 70 can be strongly linked to each other. Accordingly, the impeller 70 can be rotated at high speeds in a stable manner.
- a metal face can be used as the inclined face portion 72 d , and accordingly the surface of the upper tip of the ring-shaped inclined face 70 b can be smoothed.
- the impeller 70 is fixed to the shaft 31 by fitting the upper end portion of the shaft 31 into the cylindrical portion 72 a of the impeller hub 72 from the lower side. As illustrated in FIG. 2 , the impeller 70 connected to the shaft 31 is disposed at the inner side of the ring-shaped protruding portion 66 c of the exhaust air guide member 60 . Accordingly, the protruding portion 66 c is disposed nearby a vent 70 c of the impeller 70 .
- the protruding portion 66 c guides exhaust air discharged from the impeller 70 to the lower side, along with a later-described exhaust air guide 83 of the impeller housing 80 .
- the outer peripheral face of the ring-shaped protruding portion 66 c is an inclined face that is inclined downwards the further on the outer side in the radial direction it is.
- the outer peripheral face of the protruding portion 66 c is a smooth convex curved face toward the outer side.
- the lower end of the outer peripheral face of the protruding portion 66 c is smoothly connected to the outer peripheral face of the cylindrical partitioning ring 66 b . Accordingly, the inclination angle as to a direction perpendicular to the axial direction is approximately 90° at the lower end of the protruding portion 66 c .
- the upper end of the protruding portion 66 c is positioned on the immediately outer side in the radial direction of the outer edge of the base portion 73 of the impeller 70 .
- the upper end of the protruding portion 66 c is positioned at the upper side from the lower face of the base portion 73 , but is positioned at the lower side from the upper face of the outer edge of the base portion 73 .
- air discharged from the impeller 70 can be smoothly guided downwards without turbulence in the flow, due to the protruding portion 66 c having the above-described shape and placement.
- air is discharged from the outer edge of the base portion 73 in a direction approximately perpendicular to the axial direction.
- the upper end of the protruding portion 66 c is at a position lower than the upper face of the base portion 73 in the present embodiment, so the discharged air is guided following the other peripheral face of the protruding portion 66 c without colliding with the protruding portion 66 c . Accordingly, air can be conveyed efficiently.
- the impeller housing 80 has the intake port 80 a on the upper side, and has the shape of a cylinder that is tapered toward the upper side in the axial direction, as illustrated in FIG. 2 .
- the impeller housing 80 has an intake guide portion 81 positioned at the opening end of the intake port 80 a , an impeller housing main body 82 that accommodates the impeller 70 , an exhaust air guide 83 extending from the outer peripheral edge of the impeller housing main body 82 toward the outer side in the radial direction and toward the lower side, in a form like a skirt, and an outer periphery attachment ring 84 that extends toward the upper side from the outer peripheral edge of the exhaust air guide 83 .
- the impeller housing main body 82 has a cross-sectional shape modeled after that of the shroud 75 of the impeller 70 .
- the inner face (lower face) of the impeller housing main body 82 faces the outer face (upper face) of the shroud 75 across a uniform spacing.
- the ring-shaped intake guide portion 81 that protrudes toward the inner side in the radial direction is positioned on the upper end of the inner peripheral side of the impeller housing main body 82 .
- the intake guide portion 81 covers an upper end face 75 b of the shroud 75 from above, as illustrated in FIG. 10 .
- a narrow gap runs in the radial direction between the lower face of the intake guide portion 81 and the upper end face 75 b of the shroud 75 .
- a peripheral edge bend portion 82 a bent to wrap around the outer peripheral end of the shroud 75 , is provided to the end of the impeller housing main body 82 at the outer peripheral side.
- the peripheral edge bend portion 82 a extends to the lower side and encompasses the outer side end face of the shroud 75 from the outer side in the radial direction.
- a narrow gap extending to the upper side in the axial direction runs between the inner peripheral face of the peripheral edge bend portion 82 a and the outer side end face of the shroud 75 .
- the exhaust air guide 83 makes up an exhaust air flow path 92 that guides exhaust air, discharged to the outer side in the radial direction from the impeller 70 , toward the lower side, as illustrated in FIG. 10 and FIG. 11 .
- the inner peripheral face of the exhaust air guide 83 smoothly inclines from a direction perpendicular to the axial direction toward the axial direction, from the upper end toward the lower end.
- the inner peripheral face of the exhaust air guide 83 is gently connected and the lower end to the inner peripheral face 65 a of the outer peripheral cylindrical portion 65 of the exhaust air guide member 60 , thereby making up a wall face at the outer peripheral side of the exhaust air flow path 92 .
- the outer periphery attachment ring 84 is cylindrical in shape.
- the outer periphery attachment ring 84 has a flange portion 84 a extending from the upper end toward the outer side in the radial direction.
- the outer peripheral face of the outer periphery attachment ring 84 fits to the inner peripheral face of the outer periphery cylindrical portion 65 of the exhaust air guide member 60 .
- the flange portion 84 a also comes into contact with the upper end of the outer periphery cylindrical portion 65 and positions the impeller housing 80 as to the exhaust air guide member 60 in the vertical direction.
- a recess 86 that extends in the circumferential direction is provided on the upper face of the exhaust air guide 83 .
- the recess 86 is made up of the peripheral edge bend portion 82 a , exhaust air guide 83 , and outer periphery attachment ring 84 .
- the thickness of the exhaust air guide 83 is made uniform due to the recess 86 having been provided to the impeller housing 80 .
- ribs 85 that connect the outer periphery attachment ring 84 to the peripheral edge bend portion 82 a of the impeller housing main body 82 in the radial direction are provided in the recess 86 .
- the impeller housing 80 is produced by molding. That is to say, the impeller housing 80 is manufactured by injecting a material in a fluid state into a cavity between two or more molds, which is then hardened.
- the impeller housing 80 according to the present embodiment is made of a resin material, and is fabricated by injection molding.
- the impeller housing 80 is fabricated by aluminum die-casting.
- the molded article manufactured by molding may exhibit sink marks on the surface of thick portions, due to shrinkage when the material hardens, and this may deteriorate dimensional precision.
- air pockets (cavities) may occur within thick portions, and this may deteriorate strength.
- the recess 86 is provided between the outer periphery attachment ring 84 and the peripheral edge bend portion 82 a of the impeller housing main body 82 of the impeller housing 80 according to the present embodiment.
- the thickness of the exhaust air guide 83 can be made uniform in the impeller housing 80 , thereby suppressing occurrence of sink marks from occurring on the periphery of the exhaust air guide 83 .
- air pockets can be suppressed from occurring within the exhaust air guide 83 of the impeller housing 80 .
- the ribs 85 are provided to the recess 86 of the impeller housing 80 according to the present embodiment, so rigidity of the outer periphery attachment ring 84 as to the impeller housing main body 82 can be increased. Accordingly, the impeller housing 80 can be strongly fixed to the exhaust air guide member 60 at the outer periphery attachment ring 84 .
- the board case 15 is attached to the lower side of the motor 10 , and encompasses the control board 11 , as illustrated in FIG. 1 and FIG. 2 .
- the board case 15 has a disc-shaped base wall 16 , and a cylindrical portion 17 that extends upward from the outer edge of the base wall 16 .
- the cylindrical portion 17 is provided with the final vent 17 b that passes through the board case 15 in the radial direction so the inner side and the outer side communicate.
- the final vent 17 b merges and discharges air discharged from the vents (first vents 96 , second vents 97 , and third vents 95 ).
- FIG. 13 is a side view of the motor 10 .
- An upper end face 17 a of the cylindrical portion 17 is inclined in a spiral form centered on the central axis J, as illustrated in FIG. 1 and FIG. 13 .
- the upper end face 17 a progressively inclines in the same direction as the rotation direction of the impeller 70 toward the lower side.
- the final vent 17 b is positioned at the lower end side of the spiral of the upper end face 17 a .
- Exhaust air discharged from the third vents 95 of the exhaust air guide member 60 flows downwards between the outer peripheral face of the motor 10 and the inner peripheral face 19 a of the casing 19 accommodating the motor 10 .
- this exhaust air Upon reaching the upper end face 17 a of the cylindrical portion 17 , this exhaust air follows the incline of the upper end face 17 a , swirls and reaches the final vent 17 b , and is discharged.
- the upper end face 17 a guides exhaust air including the swirling component that is discharged obliquely downwards from the third vents 95 to the final vent 17 b without changing the direction of flow at an abrupt angle, so deterioration of venting efficiency can be reduced.
- At least one third vent 95 of the multiple third vents 95 is positioned directly above the final vent 17 b .
- the third vent 95 that is positioned directly above the final vent 17 b will be referred to as a direct-above vent 95 A here.
- An uppermost end 17 c of the upper end face 17 a is positioned at the lower side of the inner guide portion 67 in the present embodiment. Accordingly, exhaust air discharged from the direct-above vent 95 A is not guided to the upper end face 17 a , but rather passes over a distance that is shorter than being guided to the upper end face 17 a and is discharged from the final vent 17 b , and thus can improve the discharge efficiency from the direct-above vent 95 A.
- the upper end face 17 a in the present embodiment has been exemplarily illustrated with regard to a case where the inclination along the circumferential direction is constant.
- the upper end face 17 a may be an inclined face of which the inclination changes along the circumferential direction.
- the upper end face 17 a preferably is an inclined face where the angle of inclination gradually becomes gentler from the upper side toward the lower side.
- the upper end face 17 a may be a curved face that is convex toward the lower side, with the radial center of curvature of the curved face that the upper end face makes up being positioned at the upper side from the upper end face 17 a . Accordingly, exhaust air flowing toward the lower side may be made to gradually swirl following the upper end face 17 a , and be guided to the final vent 17 b , whereby discharge efficiency can be improved.
- the control board 11 is connected to coil lines extending from the coils 42 , and the sensor board 50 , and controls the motor 10 .
- the control board 11 is attached to the lower side of the motor 10 in a stage of being inclined as to the lower lid 22 , via multiple (three in the present embodiment) post-shaped members 13 fixed to the lower lid 22 , as illustrated in FIG. 2 .
- the post-shaped members 13 are fixed by screwing to screw holes 22 d in the lower lid 22 .
- the multiple post-shaped members 13 each have different heights.
- inclined faces are provided to the lower side end faces of the post-shaped members 13 .
- the control board 11 is fixed by screwing to the lower side end faces of the post-shaped members 13 via spacers 13 a.
- the control board 11 is inclined toward the final vent 17 b of the board case 15 , within the board case 15 . That is to say, the lowest point of the control board 11 is positioned toward the final vent 17 b side.
- Exhaust air that has passed through the interior of the motor 10 and been discharged to the lower side of the motor 10 from the first vents 96 and second vents 97 strikes the control board 11 and cools the control board 11 . Further, exhaust air that has struck an upper face 11 a of the control board 11 is smoothly discharged to the final vent 17 b following the inclination of the control board 11 . That is to say, venting efficiency can be increased due to the control board 11 being inclined toward the final vent 17 b . Further, the projection area of the control board 11 as viewed from the axial direction can be reduced by disposing the control board 11 in an inclined manner.
- the gap between the outer edge of the control board 11 and the inner peripheral face of the cylindrical portion 17 of the board case 15 can be increased to let exhaust air flow to a lower face 11 b side of the control board 11 . Accordingly, even in a case where mounted parts that generate a great amount of heat, such as capacitors or the like, are mounted on the lower face 11 b of the control board 11 , these can be efficiently cooled.
- the position of the control board 11 in the axial direction preferably is close, within a range where there is no interference between the upper face 11 a of the control board 11 and the mounted parts mounted on the upper face 11 a , and the lower lid 22 of the motor 10 . Accordingly, not only is the cooling efficiency of the control board 11 improved, but also the effect of the exhaust air being guided to the final vent 17 b due to the inclination of the control board 11 can be increased.
- the blower 1 draws air onto the impeller 70 from the intake port 80 a by rotating the impeller 70 by the motor 10 , and discharges air to the outer side in the radial direction via air flow paths within the impeller 70 , as illustrated in FIG. 2 .
- the exhaust air discharged from the impeller 70 passes through the exhaust air flow path 92 and flows into the exhaust air guide member 60 .
- the exhaust air flow path 92 is positioned between the inner peripheral face of the exhaust air guide 83 of the impeller housing 80 and the outer peripheral face of the protruding portion 66 c , and directs exhaust air, discharged toward the outer side in the radial direction by the impeller 70 , toward the lower side.
- the exhaust air flowing toward the lower side of the exhaust air flow path 92 is branched into and flows through first guide paths D 1 and second guide paths D 2 alternately positioned in the circumferential direction of the exhaust air guide member 60 .
- Exhaust air passing through the first guide paths D 1 is guided further to the inner side in the radial direction than the inner peripheral face 67 b of the inner guide portion 67 , and is rectified by the stator vanes 67 a and flows to the interior of the motor 10 through the through holes 25 and 26 , as illustrated in FIG. 10 .
- the exhaust air flows toward the lower side in the air flow paths FP.
- the upper-side inclined protruding portions 43 g of the upper-side insulators 43 and the lower-side inclined protruding portions 44 g of the lower-side insulators 44 direct the swirling component of the exhaust air toward the lower side within the air flow paths FP, as illustrated in FIG. 5 .
- the outer peripheral faces of the linear portions 41 c (stator core 41 ) are exposed within the air flow paths FP, and are cooled by the exhaust air.
- Multiple plate portions 45 are disposed within the air flow paths FP, and rectify the exhaust air flowing through the air flow paths FP. Exhaust air that has passed through the air flow paths FP is discharged downwards from the lower-side openings 24 serving as the first vents 96 .
- the coils 42 which are heat generators in the motor 10 , can be cooled.
- the exhaust air can be efficiently guided toward the lower side by the exhaust guide holes 48 of the molded portion 47 .
- the exhaust air discharged toward the lower side from the exhaust guide holes 48 is discharged downwards from the through holes 22 a serving as the second vents 97 .
- the exhaust air discharged from the first vents 96 and second vents 97 strikes the upper face 11 a of the control board 11 fixed in an inclined manner and cools the control board 11 , and further is guided toward to the final vent 17 b of the board case 15 following the upper face 11 a of the control board 11 and is discharged.
- exhaust air passing through the second guide paths D 2 moves to the outer side in the radial direction due to the inner-side inclined portion 66 d of the partitioning ring 66 b , and is discharged to the lower side via the third vents 95 , as illustrated in FIG. 11 .
- the exhaust air discharged to the lower side from the third vents 95 flows toward the lower side following the outer peripheral face of the housing 20 of the motor 10 .
- Part of the exhaust air that flows along the outer peripheral face of the housing 20 swirls in spiral form following the upper end face 17 a of the board case 15 , and is guided to the final vent 17 b and discharged, as illustrated in FIG. 13 .
- Part of the exhaust air flowing along the outer peripheral face of the housing 20 passes over a distance shorter than having been guided by the upper end face 17 a , and reaches the final vent 17 b without passing over the upper end face 17 a , and is discharged.
- blower 301 having a hollow member (flow path forming member) 347 instated of the molded portion 47 in the above-described embodiment, will be described as a first modification with reference to FIG. 16 .
- Components that are of the same form as in the above-described embodiment are denoted by the same reference symbols, and description thereof will be omitted.
- a stator 340 of the blower 301 has multiple (three) hollow members (flow path forming member) 347 .
- the hollow members 347 are U-shaped with a cross-section taken at a plane orthogonal to the central axis opens to the outer side in the radial direction, with the inner side of the U-shape being hollow.
- the hollow members 347 are positioned on the inner side of the core back portion 41 a in the radial direction.
- the hollow members 347 are positioned between coils 42 arrayed in the circumferential direction.
- the hollow members 347 make up exhaust guide holes (flow paths) 348 extending in the vertical direction at the inner side of the core back portion 41 a in the radial direction.
- the hollow members 347 according to the present modification are disposed by inserting preformed resin materials between coils 42 arrayed in the circumferential direction. According to the present modification, the hollow members 347 can easily configure the exhaust guide holes 348 extending in the axial direction. Accordingly, the blower 301 can cool the interior of the motor 10 via the hollow members 347 , and can raise discharge efficiency.
- FIG. 17 is a longitudinal-sectional view of a centrifugal air blower (blower) 1001 according to the second modification.
- This centrifugal air blower 1001 is a turbo-type centrifugal fan that suctions air from above, from suction holes provided on an upper portion, and discharges downwards. Turbo-type centrifugal fans are more efficient and less noisy as compared to sirocco centrifugal fans.
- the centrifugal air blower 1001 according to the present modification is provided to a canister-type vacuum cleaner, for example, and is used to generate suction force for the vacuum cleaner.
- the centrifugal air blower according to the present disclosure may be used in usages other than vacuum cleaners.
- the centrifugal air blower according to the present disclosure may be installed in other air blowers such as air supply/exhaust devices used as range hood fans or ducts in buildings, home electrical appliances, medical equipment, industrial large-scale facilities, and so forth, to perform suction and exhaust.
- the centrifugal air blower 1001 includes a motor 1011 , an impeller 1012 , and a blower casing 1013 , as illustrated in FIG. 17 .
- a later-described rotating portion (rotor) 1030 of the motor 1011 and the impeller 1012 rotate entered on a central axis 1009 .
- the motor 1011 has the rotating portion (rotor) 1030 and a stationary portion 1020 .
- the stationary portion 1020 further includes a stator 1021 .
- the blower casing 1013 has a lower-side casing (housing) 1135 . That is to say, the centrifugal air blower 1001 has the rotor 1030 , stator 1040 , lower-side casing (housing) 1135 , and impeller 1012 .
- the lower-side casing 1135 accommodates the rotating portion 1030 and stationary portion 1020 .
- a middle casing 1134 is positioned at the upper side of the lower-side casing 1135 .
- the lower-side casing 1135 has a cylindrical shape extending in the axial direction and opening at the upper side. That is to say, the lower-side casing 1135 has a through hole that passes through the upper side in the vertical direction and opens to the inner side. The through hole of the lower-side casing 1135 connects to alter-described gap 1090 .
- the motor 1011 is an inner-rotor type brushless DC motor.
- the motor 1011 has the stationary portion 1020 and rotating portion (rotor) 1030 .
- the stationary portion 1020 is stationary in relation to the blower casing 1013 .
- the rotating portion 1030 is rotatably supported as to the stationary portion 1020 , centered on the central axis 1009 .
- the stationary portion 1020 has the stator 1021 , a motor cover 1022 , a base plate 1023 , a circuit board 1024 , an upper bearing 1025 , and a lower bearing 1026 .
- the rotating portion 1030 has a shaft 1031 and a rotor 1032 .
- the stator 1021 generates magnetic flux in accordance with driving voltage supplied from the circuit board 1024 .
- the stator 1021 is disposed at the periphery of the later-described rotor 1032 .
- the stator 1021 has multiple core pieces 1060 , multiple insulators 1070 , and multiple coils 1080 .
- the core pieces 1060 are disposed in a ring form around the central axis 1009 .
- the core pieces 1060 have a core back 1061 extending in the circumferential direction, and teeth 1062 that protrude from the core back 1061 toward the inner side in the radial direction.
- the insulators 1070 are attached to the core pieces 1060 .
- the coils 1080 are configured of conducting wires wound around the teeth 1062 via the insulators 1070 . Further detailed structures of the stator 1021 will be described later.
- the motor cover 1022 is a resin member that holds the stator 1021 .
- the motor cover 1022 an upper plate portion 1221 , a side plate portion 1222 , a first fixing portion 1223 , a second fixing portion 1224 , and at least one base plate fixing portion 1225 .
- the upper plate portion 1221 is a plate-shaped member that extends generally perpendicular to the central axis 1009 above the stator 1021 .
- a through hole is formed at the generally middle portion of the upper plate portion 1221 .
- the upper bearing 1025 is held in this through hole in the upper plate portion 1221 .
- the side plate portion 1222 is a generally cylindrical shape, and extends from the edge of the upper plate portion 1221 downward in the axial direction.
- the base plate fixing portion 1225 protrudes toward the outer side in the radial direction from around the lower end portion of the side plate portion 1222 . At least one screw hold is formed in the base plate fixing portion 1225 .
- Base plate fixing portions 1225 are provided at three positions in the circumferential direction in the motor 1011 according to the present modification. Note however, that the number of positions of fixing the motor cover 1022 and base plate 1023 is not restricted to three positions, and may be two positions, or four positions or more. Also, the motor cover 1022 and base plate 1023 may be fixed by other methods, such as adhesion, crimping, or the like. The structures of the first fixing portion 1223 and second fixing portion 1224 will be described later.
- the base plate 1023 is a member covering at least part of the lower opening of the motor cover 1022 .
- the base plate 1023 extends generally perpendicular to the central axis 1009 .
- a recess is formed at the middle of the base plate 1023 .
- the lower bearing 1026 is held in this recess in the base plate 1023 .
- the stator 1021 , circuit board 1024 , upper bearing 1025 , lower bearing 1026 , and rotor 1032 are accommodated in the interior of a casing configured of the motor cover 1022 and base plate 1023 .
- the circuit board 1024 is generally plate shaped in the present modification.
- the circuit board 1024 is positioned generally perpendicular to the central axis 1009 , further toward the lower side than the stator 1021 .
- Electronic parts making up an electric circuit for supplying driving current to the coils 1080 are mounted on the circuit board 1024 .
- the ends of conducting wires making up the coils 1080 are electrically connected to the electric circuit on the circuit board 1024 .
- the upper bearing 1025 rotatably supports the shaft 1031 as to the motor cover 1022 .
- the lower bearing 1026 rotatably supports the shaft 1031 as to the base plate 1023 .
- Ball bearings where ball-shaped rolling members are interposed between an inner ring and an outer ring, are used for the upper bearing 1025 and lower bearing 1026 , for example.
- An elastic member 1027 is interposed between the motor cover 1022 and the upper bearing 1025 . Accordingly, the vibration when the motor 1011 and impeller 1012 rotate is reduced.
- bearings of types other than ball bearings may be used for the upper bearing 1025 and lower bearing 1026 .
- the shaft 1031 is disposed along the vertically-extending central axis 1009 . More specifically, the shaft 1031 is a post-shaped member disposed along the central axis 1009 .
- the shaft 1031 is supported by the upper bearing 1025 and lower bearing 1026 , and can rotate centered on the central axis 1009 .
- the upper end of the shaft 1031 protrudes further to the upper side than the motor cover 1022 .
- the impeller 1012 is directly fixed at the upper end of the shaft 1031 . Although the impeller 1012 is fixed at the upper end of the shaft 1031 in the present modification, the impeller 1012 may be indirectly fixed to the shaft 1031 , via another member such as a cylindrical member made of a resin material or metal material, or the like.
- the rotor 1032 is fixed to the shaft 1031 , and rotates centered on the central axis 1009 along with the shaft 1031 .
- the rotor 1032 according to the present modification is made of a magnetic resin formed in a generally cylindrical shape.
- the outer peripheral face of the rotor 1032 is magnetized with N poles and S poles alternately in the circumferential direction.
- the outer peripheral face of the rotor 1032 faces the end face of the teeth 1062 at the inner side in the radial direction, across a minute gap. That is to say, the rotor 1032 has magnetic faces facing the stator 1021 in the radial direction.
- the rotor 1032 may be an arrangement where multiple magnets are fixed on the outer peripheral face or the inside of a cylindrical rotor core that is a magnetic material.
- the impeller 1012 is a so-called turbo-type centrifugal impeller.
- the impeller 1012 is disposed above the motor cover 1022 of the motor 1011 .
- the impeller 1012 has an upper shroud 1051 , a lower shroud 1052 , and multiple blades 1053 , as illustrated in FIG. 17 .
- the upper shroud 1051 includes a cylindrical portion 1511 , a sleeve portion 1512 , and a suction port 1513 .
- the upper shroud 1051 is disposed above the lower shroud 1052 and multiple blades 1053 .
- the cylindrical portion 1511 is a generally cylindrical member centered on the central axis 1009 .
- the cylindrical portion 1511 according to the present modification has a diameter that is generally constant regardless of the position in the axial direction. Note that the cylindrical portion 1511 may have a shape where the diameter progressively increases toward the lower side in the axial direction.
- the sleeve portion 1512 expands toward the outer side in the radial direction from the lower end of the cylindrical portion 1511 .
- the radial position of the outer edge of the sleeve portion 1512 is generally the same as the position of the outer edge of the lower shroud 1052 in the radial direction.
- the suction port 1513 is positioned at the middle of the upper shroud 1051 .
- the suction port 1513 is formed of the cylindrical portion 1511 and passes in the axial direction through the upper shroud 1051 at the inner side of the cylindrical portion 1511 in the radial direction.
- the lower shroud 1052 is a plate-shaped member that extends generally perpendicular to the central axis 1009 , above the motor cover 1022 .
- the lower face of the lower shroud 1052 facings the upper face of the motor cover 1022 in the axial direction.
- the tip on the inner side in the radial direction of the lower shroud 1052 is fixed to the shaft 1031 of the motor 1011 .
- the blades 1053 are disposed between the upper shroud 1051 and the lower shroud 1052 in the axial direction.
- the multiple blades 1053 are disposed generally equidistantly in the circumferential direction.
- An upper-side casing 1133 has a top plate portion 1131 and a wall portion 1132 .
- the top plate portion 1131 is positioned above the impeller 1012 , and extends in a ring shape following the upper face of the upper shroud 1051 .
- the top plate portion 1131 has a middle hole 1130 at the middle thereof.
- the middle hole 1130 is connected to the above-described suction port 1513 .
- the wall portion 1132 extends downwards in a cylindrical form from the top plate portion 1131 at the outer side of the motor 1011 in the radial direction. At least the upper end of the motor 1011 and the impeller 1012 are accommodated on the inner side of the wall portion 1132 in the radial direction. That is to say, the wall portion 1132 encompasses at least part of the motor 1011 .
- the inner side face of the wall portion 1132 faces at least part of the motor 1011 in the radial direction.
- the blower casing 1013 is formed from three ring-shaped members, which are the upper-side casing 1133 , middle casing 1134 , and lower-side casing 1135 .
- the middle casing 1134 is disposed beneath the upper-side casing 1133 .
- the lower-side casing 1135 is disposed beneath the middle casing 1134 .
- the upper-side casing 1133 includes the upper end of the top plate portion 1131 and wall portion 1132 .
- the middle casing 1134 and lower-side casing 1135 are cylindrical members forming the wall portion 1132 .
- blower casing 1013 has been described as being formed of three members, but the blower casing 1013 may be formed of one member, or may be formed of two, or four or more members. That is to say, the blower casing 1013 is formed of at least one member.
- the outer peripheral face of the motor cover 1022 and the inner peripheral face of the wall portion 1132 of the blower casing 1013 are disposed across a gap in the radial direction.
- the gap between the outer peripheral face of the motor cover 1022 and the inner peripheral face of the wall portion 1132 serves as a flow path 1010 of gas when driving the centrifugal air blower 1001 . At least part of the flow path 1010 connects to a vent that the wall portion 1132 has.
- a communication hole 1100 that connects the outside and inside of the motor cover 1022 is formed in the motor cover 1022 in this space or below this space in the axial direction, the communication hole 1100 communicating with a gap (flow path) 1090 .
- the gap 1090 has a generally triangular shape or generally trapezoidal shape in plan view.
- the gap 1090 is positioned on the inner side of the core back 1061 in the radial direction.
- the gap 1090 has an upper opening 1090 a positioned at the upper side of the core back 1061 , and a lower opening 1090 b positioned at the lower side of the core back 1061 .
- the upper opening 1090 a opens toward the upper side in the axial direction.
- the lower opening 1090 b opens toward the lower side in the axial direction.
- the width of the gap 1090 in the circumferential direction progressively decreases toward the inner side in the radial direction.
- the gap 1090 may be connected to a through hole 1221 a provided to the upper plate portion 1221 of the motor cover 1022 and pass through in the vertical direction, not only being connected to the communication hole 1100 . In this case, the flow of exhaust air passing through the gap 1090 becomes smooth, and venting efficiency can be increased.
- the gas discharged to the outer side of the impeller 1012 in the radial direction strikes against the wall portion 1132 of the upper-side casing 1133 and changes direction downwards and toward the inner side in the radial direction, and advances downwards in the axial direction through the flow path 1010 formed between the outer peripheral face of the motor cover 1022 and inner peripheral face of the wall portion 1132 , and the gap 1090 of the stator 1021 , as illustrated FIG. 17 .
- This air flow then is discharged to the outside of the centrifugal air blower 1001 via a vent at the lower end of the flow path 1010 .
- FIG. 18 is a plan view of the stator 1021 .
- the stator 1021 according to the present modification has three core pieces 1060 , three insulators 1070 , and three coils 1080 , as illustrated in FIG. 18 .
- This configuration enables the number of times of applying electricity to the winding wires per rotation to be reduced, so the motor is readily driven at high speeds.
- the stator may be configured from a single core piece.
- the insulators 1070 each have a teeth insulating portion 1071 , an inner-side wall portion 1072 , and an outer-side wall portion 1073 .
- FIG. 19 is a plan view of a core pieces 1060 .
- the multiple core pieces 1060 are formed of a magnetic material, and disposed in the circumferential direction. Laminated steel plates, where magnetic steel plates that are magnetic material have been laminated in the axial direction, for example, are used for the core pieces 1060 .
- Each core piece 1060 has a core back (core back portion) 1061 and tooth (teeth portion) 1062 , as illustrated in FIG. 19 .
- the core back 1061 extends in the outer side from the tooth 1062 in the circumferential direction. Note however, that the top view of the core back 1061 does not necessarily have to be an arc shape, as long as the entirety extends roughly in the circumferential direction.
- the tooth 1062 protrudes from the middle of the core back 1061 in the circumferential direction toward the inner side in the radial direction.
- the core back 1061 has a middle core back portion 1611 and a pair of connecting core back portions 1612 .
- the middle core back portion 1611 extends generally perpendicular to the tooth 1062 that extends in the radial direction.
- the middle core back portion 1611 also extends in both sides in the circumferential direction from the outer-side end of the tooth 1062 in the radial direction.
- the pair of connecting core back portions 1612 is positioned on both sides of the middle core back portion 1611 in the circumferential direction.
- Each connecting core back portion 1612 extends from the end of the middle core back portion 1611 in the circumferential direction while bending in a direction drawing closer to the tooth 1062 .
- one tooth 1062 is provided to each of the three core pieces 1060 in the present modification. Accordingly, the number of teeth 1062 that the stator 1021 has is the minimal three for a three-phase synchronous motor. Reducing the number of teeth 1062 enables the number of times of switching of the motor driving circuit per rotation to be reduced. Accordingly, the motor 1011 can be readily made to handle high speeds.
- the three core pieces 1060 are arrayed in the circumferential direction, as illustrated in FIG. 18 .
- the core backs 1061 of the three core pieces 1060 are linked into a ring shape. Specifically, the edge portions of connecting core back portions 1612 of adjacent core pieces 1060 are linked to each other.
- the joints between the core pieces 1060 are fixed by welding, for example.
- a fixing hole 1063 that passes through in the axial direction is provided to the core back 1061 of each core piece 1060 . That is to say, all of the core pieces 1060 each have a fixing hole 1063 in the present modification. According to this configuration, all of the core pieces 1060 can be firmly fixed to the motor cover 1022 at the time of assembling the centrifugal air blower 1001 .
- the fixing hole 1063 is positioned on the outer side of the teeth portion 1602 in the radial direction.
- the vicinity of the core back 1061 in the circumferential direction is a position where the magnetic flux density is low when driving the motor 1011 , and the role as a flux path is small. Providing the fixing hole 1063 at this position suppresses the fixing hole 1063 from narrowing the flux path.
- the motor cover 1022 and core pieces 1060 are fixed by a fixing member inserted into the fixing holes 1063 .
- the motor cover 1022 has three first fixing portions 1223 and three second fixing portions 1224 , as illustrated in FIG. 17 .
- the three first fixing portions 1223 each protrude to the inner side in the radial direction from the side plate portion 1222 , above the above-described fixing holes 1063 .
- the second fixing portions 1224 protrude toward the inner side in the radial direction from the side plate portion 1222 , below the above-described fixing holes 1063 .
- the first fixing portions 1223 and second fixing portions 1224 are each provided with a screw hole extending in the axial direction.
- a screw 1043 which is a fixing member, is inserted into the screw hole of the second fixing portion 1224 , the fixing hole 1063 , and the first fixing portion 1223 , at each of the three positions in the circumferential direction. Accordingly, the stator 1021 and motor cover 1022 are fixed. The motor cover 1022 and core pieces 1060 can be firmly fixed by this configuration.
- the number of fixing positions of the stator 1021 and motor cover 1022 does not necessarily have to be three.
- an arrangement may be made where the fixing hole 1063 is provided to only one or two core pieces 1060 of the three core pieces 1060 .
- each core piece 1060 may be provided with two or more fixing holes.
- the method of fixing the stator 1021 and motor cover 1022 may be other than screwing.
- the motor cover 1022 may be resin molded with the stator 1021 as an insertion part, thereby fixing the stator 1021 and motor cover 1022 .
- the coils 1080 are covered at the outer peripheral faces thereof by a covering portion (flow path forming member) 1081 .
- the covering portion 1081 is resin.
- the coils 1080 are wound on the teeth 1062 of the stator 1021 , and the insulation of the coils 1080 is ensured by the coils 1080 being covered by the covering portions 1081 , and also vibration and noise can be reduced.
- the core pieces 1060 according to this modification has thin laminated steel plates laminated to reduce eddy current when rotating at high speeds, and the strength of the laminated steel plates can be ensured by the coils 1080 being covered by the covering portion 1081 .
- the gap 1090 is formed between a covering portion 1081 covering a coil 1080 and a covering portion 1081 covering another adjacent coil 1080 in the circumferential direction. Accordingly, the covering portions 1081 configure the gap 1090 .
- a wind flow path can be provided between adjacent teeth 1062 , and the stator 1021 can be cooled by the air flowing through this flow path, while satisfying airflow properties of the centrifugal air blower.
- the covering portions 1081 may have a configuration of connecting part of an insulator 1070 or coil 1080 at one side in the circumferential direction with an insulator 1070 or coil 1080 at the other side in the circumferential direction.
- the surface area of the covering portions 1081 exposed to the gap 1090 can be increased, and the coils can be efficiently cooled via the covering portions 1081 .
- a centrifugal air blower where three core pieces 1060 are employed, so space between adjacent teeth is readily secured and the stator is easier to cool as compared to six core pieces, for example.
- the distance in the circumferential direction between one covering portion 1081 and another covering portion 1081 is longer at the upper side in the axial direction of the teeth 1062 than at the middle in the axial direction, and is longer at the lower side in the axial direction of the teeth 1062 than at the middle in the axial direction.
- This static pressure of the centrifugal air blower 1001 can be raised even higher.
- the covering portions 1081 are formed by molding.
- FIG. 20 illustrates a centrifugal air blower 1001 A used in a stick-type or handy-type vacuum cleaner.
- the stator 1021 the same as in the above modification is used in the centrifugal air blower 1001 A as well, and the same advantages can be obtained.
- the present disclosure is applicable to a centrifugal air blower that blows air through a smaller diameter flow path as well.
- a structure equivalent to the above modification may also be applied to a motor used for usages other than a vacuum cleaner.
- the number of core pieces is three in the above modification, the number may be two, or may be four or more.
- FIG. 21 is a perspective view of a vacuum cleaner 100 having the blower 1 according to the present embodiment.
- the vacuum cleaner 100 has the blower according to the above-described embodiment and modifications. Accordingly, the blower 1 installed in the vacuum cleaner 100 can be efficiently cooled, and venting efficiency can be improved. Note that the blower according to the embodiment and modifications is not restricted to the vacuum cleaner 100 , and can be installed in other electric equipment as well.
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Abstract
A blower according to an exemplary embodiment of the present disclosure includes a rotor that has a shaft disposed extending vertically, a stator positioned at an outer side of the rotor in a radial direction, a cylindrical housing extending in the axial direction and accommodating the rotor and the stator, and an impeller attached to the shaft, at an upper side from the stator. The stator includes a ring-shaped core back portion, plurality of teeth portions extending from the core back portion toward an inner side in the radial direction, an insulator that covers at least part of the teeth portions, a coil wound on each of the teeth portions via the insulator, and a flow path forming member of which at least part is positioned further at an inner side in the radial direction than the core back portion. The housing has a through hole that opens to the inner side. The flow path forming member connects part of the insulator or the coil at one side in the circumferential direction and part of the insulator or the coil at another side in the circumferential direction, and forms a flow path that passes further at an inner side in the radial direction than the core back portion. The flow path connects to the through hole of the housing.
Description
- The present disclosure relates to a blower and a vacuum cleaner.
- There is known a blower of a vacuum cleaner, where cooling efficiency is increased by passing exhaust air through the interior of the motor (Japanese Unexamined Patent Application Publication No. 11-148484).
- However, there has been a problem in the blower disclosed in Japanese Unexamined Patent Application Publication No. 11-148484 that turbulence is generated in the flow of exhaust air when passing through the interior of the motor, reducing venting efficiency.
- A blower according to an exemplary embodiment of the present disclosure includes a rotor that has a shaft disposed following a central axis extending vertically, a stator positioned at an outer side of the rotor in a radial direction, a cylindrical housing extending in the axial direction and accommodating the rotor and the stator, and an impeller attached to the shaft, at an upper side from the stator. The stator includes a ring-shaped core back portion, plurality of teeth portions extending from the core back portion toward an inner side in the radial direction, an insulator that covers at least part of the teeth portions, a coil wound on each of the teeth portions via the insulator, and a flow path forming member of which at least part is positioned further at an inner side in the radial direction than the core back portion. The housing has a through hole that opens to the inner side. The flow path forming member connects part of the insulator or the coil at one side in the circumferential direction and part of the insulator or the coil at another side in the circumferential direction, and forms a flow path that passes further at an inner side in the radial direction than the core back portion. The flow path connects to the through hole of the housing.
- The above and other elements, features, steps, characteristics and advantages of the present disclosure will become more apparent from the following detailed description of the preferred embodiments with reference to the attached drawings.
-
FIG. 1 is a perspective view illustrating a blower according to the present embodiment. -
FIG. 2 is a cross-sectional diagram illustrating a blower according to an embodiment. -
FIG. 3 is a disassembled perspective view of the blower according to the embodiment. -
FIG. 4 is a perspective view, viewing a motor according to the embodiment from the lower side. -
FIG. 5 is a perspective view of a stator according to the embodiment. -
FIG. 6 is a disassembled perspective view illustrating the stator, a sensor board, and a lower lid. -
FIG. 7 is a plane cross-sectional view of the blower. -
FIG. 8 is an explanatory diagram illustrating a mounting arrangement of a rotary sensor. -
FIG. 9 is a partial cutaway perspective view of an exhaust air guide member. -
FIG. 10 is a partial enlarged cross-sectional view illustrating a first guide path of the blower according to the present embodiment. -
FIG. 11 is a partial enlarged cross-sectional view illustrating a second guide path of the blower according to the present embodiment. -
FIG. 12 is a plan view of moving blades of the impeller. -
FIG. 13 is a side view illustrating the blower according to the present embodiment. -
FIG. 14 is a cross-sectional view illustrating an exhaust air guide hole (flow path) according to the present embodiment. -
FIG. 15 is a cross-sectional view illustrating an exhaust air guide hole (flow path) according to another example. -
FIG. 16 is a plane cross-sectional view of a blower according to a first modification. -
FIG. 17 is a longitudinal-sectional view of a blower (centrifugal air blower) according to a second modification. -
FIG. 18 is a plan view of a stator according to the second modification. -
FIG. 19 is a plan view of a core piece according to the second modification. -
FIG. 20 is a cross-sectional view of another example of the blower according to the second modification inFIG. 17 . -
FIG. 21 is a perspective view illustrating a vacuum cleaner that has the blower. - A blower according to an embodiment of the present disclosure will be described with reference to the drawings. Note that the scope of the present disclosure is not restricted to the following embodiment, and changes may be optionally made within the scope of the technical idea of the present disclosure. Also note that in the drawings below, the scale, numbers, and so forth, of the structures, may be different from the actual structures, in order to facilitate understanding of the configurations.
- Also, in the drawings, an XYZ coordinate system will be illustrated as a three-dimensional orthogonal coordinate system as appropriate. In the XYZ coordinate system, a Z-axis direction is a direction parallel to an axial direction along a central axis J illustrated in
FIG. 1 . A Y-axis direction is a direction orthogonal to the Z-axis direction and is a right-left direction inFIG. 2 . An X-axis direction is a direction that is orthogonal to both of the Y-axis direction and the Z-axis direction. - Also, in the following description, a direction (the Z-axis direction) in which the central axis J extends will be referred to as a vertical direction. The positive side in the Z-axis direction (+Z side) will be referred to as the “upper side (upper side in the axial direction)” and the negative side in the Z-axis direction (−Z side) will be referred to as the “lower side (lower side in the axial direction)”. Note that the vertical direction, the upper side, and the lower side are terms that are used simply for the purpose of description and do not limit the actual positional relationship or direction. In addition, unless otherwise specifically noted, a direction (the Z-axis direction) parallel to the central axis J will be simply referred to as an “axial direction”, a radial direction of which the central axis J is the center will be simply referred to as a “radial direction”, and a circumferential direction around the central axis J will be simply referred to as a “circumferential direction”.
-
FIG. 1 is a perspective view illustrating ablower 1 according to the present embodiment.FIG. 2 is a cross-sectional diagram illustrating ablower 1 according to the present embodiment.FIG. 3 is a disassembled perspective view of theblower 1 according to the present embodiment, excluding acontrol board 11 andboard case 15. - A
blower 1 includes amotor 10, animpeller 70, an exhaustair guide member 60, animpeller housing 80, acontrol board 11, and aboard case 15, as illustrated inFIG. 1 throughFIG. 3 . Themotor 10 has arotor 30 andstator 40, which will be described later, so theblower 1 has therotor 30, thestator 40, ahousing 20, and theimpeller 70. - The exhaust
air guide member 60 is attached to the upper side (+Z side) of themotor 10. Theimpeller housing 80 is attached to the upper side of the exhaustair guide member 60. Theimpeller 70 is accommodated between the exhaustair guide member 60 andimpeller housing 80. Theimpeller 70 is attached to themotor 10 rotatably on the central axis J. Thecontrol board 11, and theboard case 15 that covers thecontrol board 11, are attached on the lower side (−Z side) of themotor 10. -
FIG. 4 is a perspective view, viewing amotor 10 according to the present embodiment from the lower side. - The
motor 10 includes thehousing 20, alower lid 22, therotor 30 that has ashaft 31, thestator 40, asensor board 50, a lower-side bearing 52 a, and an upper-side bearing 52 b, as illustrated inFIG. 2 andFIG. 4 . - The
housing 20 is a cylindrical covered container accommodating therotor 30 andstator 40. More specifically, thehousing 20 is a cylindrical form extending in the axial direction, and accommodates therotor 30 andstator 40. Thehousing 20 has aperipheral wall 21 that is cylindrical in shape, anupper lid portion 23 positioned at the upper end of theperipheral wall 21, and an upper-side bearingholding portion 27 positioned at the middle portion of theupper lid portion 23. Thestator 40 is fixed on the inner side face of thehousing 20. The upper-side bearingholding portion 27 is a cylinder protruding toward the upper side from the middle portion of theupper lid portion 23. The upper-side bearingholding portion 27 holds the upper-side bearing 52 b within. - Multiple through
holes edge portion 21 a of theperipheral wall 21 of thehousing 20 andupper lid portion 23, as illustrated inFIG. 3 . That is to say, thehousing 20 has throughholes holes 25 and three throughholes 26 are positioned alternately around the axis (seeFIG. 7 ). The through holes 25 and 26 reach from the upper side of theperipheral wall 21 to the outer edge of theupper lid portion 23. The through holes 25 and 26 pass through theperipheral wall 21 in the radial direction. The through holes 25 and 26 also pass through the upper lid portion in the vertical direction near the outer edge thereof in the radial direction. - The
lower lid 22 is attached to an opening at the lower side (−Z side) of thehousing 20. A cylindrical lower-sidebearing holding portion 22 c that protrudes toward the lower side from the lower face of thelower lid 22 is provided to the middle portion of thelower lid 22. The lower-sidebearing holding portion 22 c holds the lower-side bearing 52 a. - The
lower lid 22 is provided with through arc-shapedholes 22 a having width in the radial direction, at three positions around the axis, as illustrated inFIG. 4 . Notchedportions 22 b where the peripheral portion of thelower lid 22 has been linearly notched are provided at three positions on the peripheral edge of thelower lid 22. Gaps between the openingend 20 a at the lower side of thehousing 20 and the notchedportions 22 b are lower-side openings 24 of themotor 10. - The
rotor 30 has theshaft 31, arotor magnet 33, a lower-sidemagnet fixing member 32, and an upper-sidemagnet fixing member 34, as illustrated inFIG. 2 . That is to say, therotor 30 has theshaft 31. Therotor magnet 33 has a cylindrical shape encompassing theshaft 31 around the axis (θz direction) at the outer side in the radial direction. The lower-sidemagnet fixing member 32 and upper-sidemagnet fixing member 34 are cylindrical shapes, having an outer diameter equivalent to that of therotor magnet 33. The lower-sidemagnet fixing member 32 and upper-sidemagnet fixing member 34 are attached to theshaft 31, sandwiching therotor magnet 33 from both sides in the axial direction. The upper-sidemagnet fixing member 34 has a minor radius portion 34 a that is smaller in diameter than the lower side (rotor magnet 33 side). - The
shaft 31 is disposed following the central axis J that extends vertically. Theshaft 31 is rotatably supported around the axis (θz direction) by the lower-side bearing 52 a and upper-side bearing 52 b. Theimpeller 70 is attached to the end of theshaft 31 at the upper side (+Z side). Theimpeller 70 integrally rotates with theshaft 31 on the axis. -
FIG. 5 is a perspective view of thestator 40 according to the present embodiment.FIG. 6 is a disassembled perspective view illustrating thestator 40,sensor board 50, andlower lid 22.FIG. 7 is a plane cross-sectional view of themotor 10. - The
stator 40 is positioned on the outer side from therotor 30 in the radial direction. Thestator 40 encompasses therotor 30 around the axis (θz direction). Thestator 40 has astator core 41, multiple (three) upper-side insulators 43, multiple (three) lower-side insulators 44, and coils 42, as illustrated inFIG. 5 andFIG. 6 . Thestator core 41 includes a core backportion 41 a andmultiple teeth portions 41 b, as illustrated inFIG. 5 . Thestator 40 also has a molded portion (flow path forming member) 47 in which thecoils 42 are embedded. That is to say, thestator 40 has the core backportion 41 a,teeth portions 41 b, insulators, coils 42, and flow path forming member. The insulators in the present embodiment correspond to the upper-side insulators 43 and lower-side insulators 44. Further, the flow path forming member corresponds to the moldedportion 47. - The
stator core 41 includes the ring-shaped core backportion 41 a and multiple (three)teeth portions 41 b extending inward in the radial direction from the core backportion 41 a, as illustrated inFIG. 6 . The core backportion 41 a is ring-shaped around the central axis. The core backportion 41 a has a configuration wherelinear portions 41 c at three positions around the axis, and threearc portions 41 d, are alternatingly positioned. Theteeth portions 41 b each extend inward in the radial direction from the inner peripheral faces of thelinear portions 41 c. Theteeth portions 41 b are disposed equidistantly following the circumferential direction.Inclined members 46 that guide exhaust air to the inner side of thestator 40 are each disposed at the upper faces ofarc portions 41 d of the core backportion 41 a. Theinclined members 46 each have a shape where the thickness progressively becomes smaller from the outer side in the radial direction toward the inner side in the radial direction. - The insulators (upper-
side insulators 43 and lower-side insulators 44) cover at least part of theteeth portions 41 b. Also, thecoils 42 are wound on each of theteeth portions 41 b via the insulators (upper-side insulators 43 and lower-side insulators 44). - The upper-
side insulators 43 are insulating members covering part of the upper face and side faces of thestator core 41. The upper-side insulators 43 are provided corresponding to each of the threeteeth portions 41 b. The upper-side insulators each have an upper-side outerperipheral wall portion 43 a positioned at the upper side from the core backportion 41 a, an upper-side innerperipheral wall portion 43 e positioned at the upper side from the tip of theteeth portion 41 b, and an upper-side insulating portion 43 d that links the upper-side outerperipheral wall portion 43 a and upper-side innerperipheral wall portion 43 e in the radial direction, and that is positioned at the upper side of a portion of theteeth portion 41 b where thecoil 42 is wound. - The lower-
side insulators 44 are insulating members covering part of the lower face and side faces of thestator core 41. The lower-side insulators 44 are provided corresponding to each of the threeteeth portions 41 b. The lower-side insulators each have a lower-side outerperipheral wall portion 44 a positioned at the lower side from the core backportion 41 a, a lower-side innerperipheral wall portion 44 c positioned at the lower side from the tip of theteeth portion 41 b, and a lower-side insulating portion 44 b that links the lower-side outerperipheral wall portion 44 a and lower-side innerperipheral wall portion 44 c in the radial direction, and that tis positioned at the lower side of a portion of theteeth portion 41 b where thecoil 42 is wound. - The upper-
side insulators 43 and lower-side insulators 44 sandwich theteeth portions 41 b of thestator core 41 in the vertical direction. Thecoils 42 are wound on theteeth portions 41 b covered by the upper-side insulating portions 43 d of the upper-side insulators 43 and the lower-side insulating portions 44 b of the lower-side insulators 44. - The three upper-side outer
peripheral wall portions 43 a positioned above the core backportion 41 a of thestator core 41 encompass thecoils 42 from the outside in the radial direction, at the upper side from thestator core 41. The upper-side outerperiphery wall portion 43 a has afirst side face 43 b andsecond side face 43 c at both ends thereof in the circumferential direction. Thefirst side face 43 b is an inclined face that is inclined as to the radial direction and faces the outer side in the radial direction. Thesecond side face 43 c is an inclined face that is inclined as to the radial direction and faces the inner side in the radial direction. - A
flat face 43 f and an upper-side inclined protrudingportion 43 g are provided in tandem in the circumferential direction at a portion of the outer peripheral faces of the upper-side outerperipheral wall portion 43 a positioned above thelinear portion 41 c. Theflat face 43 f is positioned at asecond side face 43 c side, and the upper-side inclined protrudingportion 43 g is positioned at afirst side face 43 b. An arc-shaped face that is disposed following the inner peripheral face of thehousing 20 is disposed between theflat face 43 f and thesecond side face 43 c. Also, the outer peripheral face of the upper-side inclined protrudingportion 43 g is an arc-shaped face following the inner peripheral face of thehousing 20. - The
flat face 43 f extends in the axial direction, matching the outer peripheral face of thelinear portion 41 c of thestator core 41. - The upper-side inclined protruding
portion 43 g protrudes to the outer side in the radial direction as to theflat face 43 f. The upper-side inclined protrudingportion 43 g also protrudes toward the lower side in the axial direction, and covers part of thelinear portion 41 c of thestator core 41 from the outer side in the radial direction. An axial-direction flat face 43 j, and an upper-side guide inclinedface 43 h positioned at the lower side from the axial-direction flat face 43 j, are provided on the side face of the upper-side inclined protrudingportion 43 g that is adjacent to theflat face 43 f. The upper-side guide inclinedface 43 h gradually inclines in a direction facing the lower side the farther toward the lower side it is. The axial-direction flat face 43 j and upper-side guide inclinedface 43 h are smoothly connected. The inclination direction of the upper-side guide inclinedface 43 h is the same direction as the rotational direction of the impeller. Accordingly, the swirling component of exhaust air flowing through air flow paths FP is smoothly directed toward the lower side by the upper-side guide inclinedface 43 h and a later-described lower-side guiding inclinedface 44 h. Thus, the venting efficiency of exhaust air flowing through the air flow paths FP can be improved. - The upper-side outer
peripheral wall portions 43 a that are adjacent in the circumferential direction are separated by predetermined gaps, as illustrated inFIG. 7 . At adjacent upper-side outerperipheral wall portions 43 a, thefirst side face 43 b of one upper-side outerperiphery wall portion 43 a and thesecond side face 43 c of the other upper-side outerperiphery wall portion 43 a are disposed facing each other in the circumferential direction. The degree of inclination of thefirst side face 43 b as to the radial direction and the degree of inclination as to the radial direction of thesecond side face 43 c differ. In further detail, the width in the circumferential direction of anopening portion 90 at the outer side in the radial direction of a gap CL formed between adjacent upper-side outerperiphery wall portions 43 a is narrower than the width in the circumferential direction of an opening portion 91 at the inner side in the radial direction. - Below the gaps CL are the
inclined members 46 disposed above the core backportion 41 a (seeFIG. 6 ). Theinclined members 46 are sandwiched between the first side faces 43 b and second side faces 43 c. The gaps CL are positioned on the inner side of the throughholes 26 of thehousing 20. The through holes 26 and the gaps CL are air flow paths that guide exhaust air flowing in from the outer side of thehousing 20 to the inner side of thestator 40. The direction of inclination of the gaps CL as to the radial direction as viewed from above (direction from the outer side toward the inner side in the radial direction) matches the direction of flow of exhaust air discharged from the exhaustair guide member 60 in the circumferential direction. That is to say, this matches the rotational direction of theimpeller 70. - Forming the opening
portions 90 at the inlet side of the gaps CL relatively larger than the opening portions 91 at the outlet side, as illustrated inFIG. 7 enables more exhaust air to be suctioned into the gaps CL from the throughholes 26, and relatively narrowing the width of the opening portions 91 at the outlet side enables the air discharged from the gaps CL to be caused to flow toward target positions (coils 42) more accurately. - The three lower-side outer
peripheral wall portions 44 a positioned at the lower side from the core backportion 41 a encompass thecoils 42 at the lower side of thestator core 41 from the outer side in the radial direction, as illustrated in FIG. 6. Although there are gaps between lower-side outerperipheral wall portions 44 a that are adjacent in the circumferential direction, the lower-side outerperipheral wall portions 44 a may be in contact with each other in the circumferential direction. - Of the outer peripheral faces of the lower-side outer
peripheral wall portions 44 a, the portions positioned at the lower side from thelinear portions 41 c of the core backportion 41 a each have aflat face 44 d and a lower-side inclined protruding portion 44 g provided in tandem in the circumferential direction. Both sides in the circumferential direction of the region where theflat face 44 d and lower-side inclined protruding portion 44 g are provided, are provided with arc-shaped faces disposed following the inner peripheral face of thehousing 20. - The
flat face 44 d extends in the axial direction matching the outer peripheral face of thelinear portion 41 c. - The lower-side inclined protruding portion 44 g protrudes towards the outer side in the radial direction with regard to the
flat face 44 d. The lower-side inclined protruding portion 44 g also covers part of thelinear portion 41 c of thestator core 41 protruding toward the upper side in the axial direction. An axial-direction flat face 44 j, and a lower-side guiding inclinedface 44 h positioned at the upper side from the axial-direction flat face 44 j, are disposed on a side face of the lower-side inclined protruding portion 44 g adjacent to theflat face 44 d. The lower-side guiding inclinedface 44 h gradually inclines in a direction facing toward the upper side the closer to the upper side it is. The axial-direction flat face 44 j and lower-side guiding inclinedface 44 h are smoothly connected. The direction of inclination of the lower-side guiding inclinedface 44 h is the same direction as the rotational direction of the impeller. - The lower-side inclined protruding portions 44 g of the lower-
side insulators 44 and the upper-side inclined protrudingportions 43 g of the upper-side insulators 43 are disposed in a staggered manner in the circumferential direction and axial direction, across gaps, as illustrated inFIG. 5 . The lower-side guiding inclined faces 44 h and upper-side guide inclined faces 43 h face each other across gaps. The gaps between the lower-side guiding inclined faces 44 h and upper-side guide inclined faces 43 h are part of the air flow paths FP between thestator 40 andhousing 20. The swirling component of exhaust air flowing through the air flow paths FP is smoothly directed toward the lower side by the lower-side guiding inclinedface 44 h and upper-side guide inclinedface 43 h. Accordingly, the venting efficiency of exhaust air flowing through the air flow paths FP can be improved. - Multiple (two in the illustration)
plate portions 45 that extend in the axial direction are provided to eachflat face 44 d. Theplate portions 45 are erected approximately perpendicular to theflat face 44 d. The tips of theplate portions 45 at the outer side in the radial direction reach the inner peripheral face of thehousing 20. Theplate portions 45 section the region of the air flow path FP between the lower-side outerperipheral wall portion 44 a and thehousing 20 into multiple regions in the circumferential direction. - The molded
portion 47 functions as a flow path forming member. That is to say, the moldedportion 47 configures exhaust guide holes 48 serving as flow paths. At least part of the moldedportion 47 is positioned at the inner side in the radial direction of the core backportion 41 a. The moldedportion 47 is formed filling in a region of thestator 40 encompassed by the upper-side outerperipheral wall portions 43 a of the upper-side insulators 43 and the lower-side outerperipheral wall portions 44 a of the lower-side insulators 44, as illustrated inFIG. 5 . Accordingly, the moldedportion 47 covers thecoils 42. The moldedportion 47 is positioned between upper-side insulators 43, between lower-side insulators 44, and betweencoils 42, that are adjacent to each other. That is, in other words the moldedportion 47 can be said to be connecting part of insulators or coils at one side in the circumferential direction and part of insulators or coils at the other side in the circumferential direction. Thus, the moldedportion 47 is supported within themotor 10. The moldedportion 47 reaches from the upper end of the upper-side insulators 43 to the lower end of the lower-side insulators 44. The moldedportion 47 is also provided with a throughhole 47 a through which the rotor is passed. The moldedportion 47 encompasses and strongly supports thecoils 42, and also integrally holds the upper-side insulators 43, lower-side insulators 44,stator core 41, andsensor board 50. Accordingly, the moldedportion 47 can reduce vibrations generated from thestator 40. - The resin material of which the molded
portion 47 is configured is not restricted, as long as it has insulating properties and thecoils 42 can be covered and embedded. The moldedportion 47 may also be configured of a hot-melt material with a low melting point. In a case of configuring the moldedportion 47 from a hot-melt material, the moldedportion 47 can be formed using a simple mold. - Three groove-shaped exhaust guide holes (flow paths) 48 that reach from the upper side to the lower end are provided on the outer peripheral face of the molded
portion 47. The groove-shaped exhaust guide holes 48 are covered from the outer side in the radial direction by the by the core backportion 41 a of thestator core 41, partway in the vertical direction. That is to say, the exhaust guide holes 48 pass through the inner side of the core backportion 41 a in the radial direction. Also, at least part of the inner side face of the core backportion 41 a in the radial direction is exposed to the exhaust guide holes 48. Thus, the core backportion 41 a can be efficiently cooled. Note that part of the winding wires of thecoils 42, upper-side insulators 43, and lower-side insulators 44 may be exposed to the exhaust guide holes 48. The exhaust guide holes 48 haveupper openings 48 a that open to the outer side in the radial direction, positioned at the upper side from the core backportion 41 a, as illustrated inFIG. 2 . Theupper openings 48 a open to the outer side in the radial direction. The exhaust guide holes 48 have inclined faces 48 c that smoothly incline toward the lower side at the inner side of theupper openings 48 a in the radial direction. The exhaust guide holes 48 also havelower openings 48 b positioned at the lower end face of the moldedportion 47, that open to the lower side. Thelower openings 48 b are positioned directly above the throughholes 22 a of thelower lid 22. That is to say, the moldedportion 47 has theupper openings 48 a opening at the upper side from the core backportion 41 a and thelower openings 48 b opening at the lower side from the core backportion 41 a. Theupper openings 48 a open toward the outer side in the radial direction. Accordingly, air flowing from the outer side of the core backportion 41 a can be efficiently guided into thestator 40. Thelower openings 48 b open toward the lower side in the axial direction. Accordingly, air heading toward the lower side in the axial direction can be discharged to the outer side of thehousing 20 without changing the direction of the air flow, by the exhaust guide holes 48 formed in the axial direction. The exhaust guide holes 48 also connect theupper openings 48 a andlower openings 48 b. Accordingly, air is efficiently guided, and the inside of thestator 40 can be cooled, by the exhaust guide holes 48. - As illustrated in
FIG. 5 , theupper openings 48 a of the exhaust guide holes 48 face the three gaps CL of the first side faces 43 b and second side faces 43 c of the upper-side insulators 43. The gaps CL are connected to the throughholes 26 of thehousing 20. Accordingly, the exhaust guide holes 48 connect to the throughholes 26 of thehousing 20. Thus, air flow paths can be configured further on the inner side from the core backportion 41 a, and the inside of thestator 40 can be efficiently cooled. The width of the exhaust guide holes 48 matches the width of the opening portions 91 positioned on the inner side of the gaps CL in the radial direction, as illustrated inFIG. 7 . Also, the exhaust guide holes 48 open from the outer peripheral face of the moldedportion 47 and extend toward the lower side, as illustrated inFIG. 2 . Note however, that the width of the exhaust guide holes 48 and the width of the opening portions 91 do not necessarily have to be the same width, and may be different widths. The moldedportion 47 has first inclined faces 48 d and second inclined faces 48 e that make up the side walls on both sides of the exhaust guide holes 48 in the width direction. The first inclined faces 48 d consecutively continue with the first side faces 43 b of the upper-side insulators 43. That is to say, the first inclined faces 48 d are positioned progressively further at the forward side in rotational direction of theimpeller 70 as to the radial direction, the further toward the inner side in the radial direction. The second inclined faces 48 e consecutively continue with the second side faces 43 c of the upper-side insulators 43. That is to say, the second inclined faces 48 e are positioned progressively further at the forward side in rotational direction of theimpeller 70 as to the radial direction, the further toward the inner side in the radial direction. Accordingly, the moldedportion 47 has inclined faces at theupper openings 48 a that are positioned in the progressively further at the forward side in rotational direction of theimpeller 70 as to the radial direction, the further toward the inner side in the radial direction. Now, these inclined faces correspond to the first inclined faces 48 d and second inclined faces 48 e. Accordingly, the exhaust air has a swirling component heading in the forward side in rotational direction of theimpeller 70, so providing the first inclined faces 48 d and second inclined faces 48 e inclined in the rotational direction, as side walls making up the exhaust guide holes 48, can raise the venting efficiency. - Exhaust air discharged from the gaps CL to the inner side of the
stator 40 in the radial direction is guided into the exhaust guide holes 48 from theupper openings 48 a, and the direction of flow is directed toward the lower side following the inclined faces 48 c. Further, the exhaust air passes through the interior of the exhaust guide holes 48 and is discharged at the lower side of thestator 40 via thelower openings 48 b. Providing the exhaust guide holes 48 in the moldedportion 47 enables the exhaust air flowing among thecoils 42 to be smoothly discharged toward the lower side without turbulence, whereby the venting efficiency can be raised. Note that in a case where thestator 40 does not have a moldedportion 47, members having the exhaust guide holes 48 may be displaced between thecoils 42. Also, thelower openings 48 b may have a shape where the cross-sectional area of the flow path progressively increases toward the lower side, which will be described alter with reference toFIG. 14 . According to this configuration, air passing through the exhaust guide holes 48 flows to the lower side more smoothly, so venting efficiency can be improved. -
FIG. 14 is a cross-sectional view of an exhaust guide holes 48, taken along line XIV-XIV inFIG. 7 . - The molded
portion 47 has alinear portion 48 f and a taperedportion 48 h positioned vertically, as side walls making up anexhaust guide hole 48. The taperedportion 48 h is positioned at the lower side of thelinear portion 48 f. Aboundary portion 48 g is provided between thelinear portion 48 f and taperedportion 48 h. Thelinear portion 48 f makes up a linear wall face in the vertical direction. Accordingly, the cross-sectional area of theexhaust guide hole 48 does not change along the vertical direction in thelinear portion 48 f. The taperedportion 48 h is inclined as to the vertical direction, so that the opposing walls separate from each other the further toward the lower side. Accordingly, the flow-path cross-sectional area of theexhaust guide hole 48 progressively increases from the upper side toward the lower side at the taperedportion 48 h. Thus, according to the present embodiment, the moldedportion 47 has a taperedportion 48 h where the flow-path cross-sectional area of theexhaust guide hole 48 progressively increases from the upper side toward the lower side. Accordingly, the static pressure of the exhaust air can be gradually reduced by the time of reaching thelower opening 48 b, so occurrence of turbulence nearby thelower openings 48 b can be suppressed, and the venting efficiency of theblower 1 can be increased. -
FIG. 15 is a cross-sectional view of anexhaust guide hole 148 according to another example that can be employed in the present embodiment. Note thatFIG. 15 is a cross-sectional view corresponding toFIG. 14 . Theexhaust guide hole 148 illustrated inFIG. 15 has the same configuration as that of the above-describedexhaust guide hole 48, except for the cross-sectional shape along the vertical direction. - The molded
portion 47 in the example illustrated inFIG. 15 has a first tapered portion 148 f and a secondtapered portion 148 h positioned vertically, as side walls making up anexhaust guide hole 148. The secondtapered portion 148 h is positioned at the lower side of the first tapered portion 148 f. Aboundary portion 148 g is provided between the first tapered portion 148 f and secondtapered portion 148 h. - The first tapered portion 148 f is inclined as to the vertical direction, so that the opposing walls come closer to each other the further toward the lower side. Accordingly, the flow-path cross-sectional area of the
exhaust guide hole 148 progressively decreases from the upper side toward the lower side at the first taperedportion 48 f. Thus, the moldedportion 47 has a first tapered portion 148 f where the flow-path cross-sectional area of theexhaust guide hole 148 progressively decreases from the upper side toward the lower side. - On the other hand, the second
tapered portion 148 h is inclined as to the vertical direction, so that the opposing walls separate from each other the further toward the lower side. Accordingly, the flow-path cross-sectional area of theexhaust guide hole 148 progressively increases from the upper side toward the lower side at the secondtapered portion 148 h. Thus, the moldedportion 47 has a secondtapered portion 148 h positioned at the lower side from the first tapered portion 148 f, where the flow-path cross-sectional area of theexhaust guide hole 148 progressively increases from the upper side toward the lower side. - The
exhaust guide hole 148 is narrowest at theboundary portion 148 g. Air that has flowed into theexhaust guide hole 148 is narrowed down due to increased flow-path resistance at the first tapered portion 148 f, and thereafter passes theboundary portion 148 g and flows into the secondtapered portion 148 h. The flow-path cross-sectional area gradually increases for the air that has flowed into the secondtapered portion 148 h, when heading toward the lower side. Accordingly, pressure of the air is gradually release, the flow gradually becomes gentle, and discharge is performed without separation. Accordingly, air blowing efficiency is improved. - The
sensor board 50 is disposed between thestator 40 and thelower lid 22, as illustrated inFIG. 2 andFIG. 6 . Thesensor board 50 has a circular ring-shapedmain unit portion 50 a, and three protrudingportions 50 b that protrude toward the outer side from the outer edge of themain unit portion 50 a, in a direction inclined as to the radial direction. Themain unit portion 50 a has a through hole through which theshaft 31 is passed. Thesensor board 50 is fixed to the lower-side insulators 44. - The
sensor board 50 has at least three rotary sensors 51 mounted thereupon. The rotary sensors 51 are Hall elements, for example. Thesensor board 50 may be electrically connected to thecoils 42. In this case, a driving circuit that outputs driving signals to thecoils 42 may be mounted on thesensor board 50. -
FIG. 8 is an explanatory diagram illustrating a mounting arrangement of a rotary sensor 51. - The rotary sensors 51 are disposed interposed between tip portions of lower-side inner
peripheral wall portions 44 c that are adjacent in the circumferential direction, as illustrated inFIG. 7 andFIG. 8 . The three rotary sensors 51 are equidistantly disposed every 120° in the circumferential direction. The faces of the rotary sensors 51 on the inner side in the radial direction face therotor magnet 33. Therotor magnet 33 is disposed at the center portion of therotor 30 in the axial direction in the case of the present embodiment. Accordingly, the rotary sensors 51 are connected to thesensor board 50 byleads 51 a of a length corresponding to the length from thesensor board 50 to therotor magnet 33 in the axial direction. - A mechanism that supports the rotary sensors 51 may be provided to the tip portion of the lower-side inner
peripheral wall portions 44 c. For example, recesses may be provided into which the rotary sensors 51 are inserted, thereby suppressing movement of the rotary sensors 51 in the radial direction. Alternatively, the rotary sensors 51 may be fixed to the lower-side innerperipheral wall portions 44 c by snap-fitting or the like. - The
lower lid 22 is attached to the openingend 20 a of thehousing 20 accommodating thestator 40 andsensor board 50, as illustrated inFIG. 4 . The three throughholes 22 a of thelower lid 22 are at least partly positioned on the outer side in the radial direction from the outer peripheral end of themain unit portion 50 a of thesensor board 50, as illustrated inFIG. 2 . The through holes 22 a serve assecond vents 97 that vent the exhaust air that has passed through the exhaust guide holes 48 of the moldedportion 47 toward the lower side of themotor 10. - The
notches 22 b of thelower lid 22 are disposed approximately matching thelinear portions 41 c of thestator core 41, the flat faces 43 f of the upper-side insulators 43, and the flat faces 44 d of the lower-side insulators 44, as viewed in the axial direction. The lower-side openings 24 at the lower face of themotor 10 serve asfirst vents 96 that discharge exhaust air that has passed through the air flow paths FP between thestator 40 andhousing 20, as illustrated inFIG. 2 . - Next, the exhaust
air guide member 60,impeller 70, andimpeller housing 80 will be described. -
FIG. 9 is a partial cutaway perspective view of the exhaustair guide member 60 from below.FIG. 10 andFIG. 11 are enlarged cross-sectional views illustrating part of theimpeller 70, exhaustair guide member 60, andimpeller housing 80. Note thatFIG. 10 illustrates a first guide path D1 that will be described later, andFIG. 11 illustrates a second guide path D2 that will be described later. - The exhaust
air guide member 60 is attached to thehousing 20 of themotor 10. The exhaustair guide member 60 has a disc-ring-shaped supportingmember 66 a, a ring-shaped protrudingportion 66 c protruding toward the upper side from the outer peripheral edge of the supportingmember 66 a, acylindrical partitioning ring 66 b extending toward the lower side from the outer peripheral edge of the supportingmember 66 a, an outer peripherycylindrical portion 65 that encompasses thepartitioning ring 66 b from the outer side in the radial direction, an multiple (six in the illustration)inner guide portions 67 extending toward the lower side from the lower end of the outer peripherycylindrical portion 65. - The supporting
member 66 a has acylindrical attachment ring 68 that extends from the lower face of the middle portion toward the lower side, and threecolumnar protruding portions 69 that protrude from the lower face of the supportingmember 66 a toward the lower side, as illustrated inFIG. 9 . - The three
columnar protruding portions 69 had the same diameters and heights, and are equidistantly disposed every 120° in the circumferential direction. Thecolumnar protruding portions 69 are hollow in the present embodiment, and each have a protruding portion through hole 69 b at the middle of anend face 69 a at the lower side that passes through in the axial direction. - The upper-side
bearing holding portion 27 of thehousing 20 is inserted into theattachment ring 68 of the exhaustair guide member 60, as illustrated inFIG. 10 . The lower face of theattachment ring 68 of the exhaustair guide member 60 and the end face 69 a at the lower side of the columnar protrudingportions 69 come into contact with the upper face of theupper lid portion 23 of thehousing 20. The exhaustair guide member 60 and themotor 10 are fastened by bolts BT passed through the protruding portion through holes 69 b of the columnar protrudingportions 69 and screwholes 23 a in theupper lid portion 23. - The
partitioning ring 66 b and outer peripherycylindrical portion 65 face each other in the radial direction across a gap. The gap between thepartitioning ring 66 b and outer peripherycylindrical portion 65 make up part of first guide paths D1 that guide exhaust air into themotor 10, and part of second guide paths D2 that discharge exhaust air to the periphery of themotor 10. The first guide paths D1 are positioned at locations in the outer peripheral direction where theinner guide portions 67 have been provided, and the second guide paths D2 are positioned between theinner guide portions 67 in the circumferential direction. Six each of the first guide paths D1 and second guide paths D2 are provided along the circumferential direction in the present embodiment. - The multiple
inner guide portions 67 each fit to the throughholes 26 or throughholes 25 of thehousing 20, as illustrated inFIG. 1 . The outer peripheral faces of theinner guide portions 67 extend in the axial direction matching the outer peripheral face of the outer peripherycylindrical portion 65, as illustrated inFIG. 9 andFIG. 10 . The inner peripheral faces 67 b of theinner guide portions 67 are inclined faces inclined toward the inner side in the radial direction, the further toward the lower side they are. The inner side of the inner peripheral faces 67 b of theinner guide portions 67 serve as first guide paths D1 to guide exhaust air discharged from theimpeller 70 to the throughholes inner guide portions 67 also is provided withmultiple stator vanes 67 a extending in the vertical direction in the form of ribs. The stator vanes 67 a link thepartitioning ring 66 b and theinner guide portion 67 in the radial direction. The exhaust air passing through the first guide paths D1 is rectified between thestator vanes 67 a and is efficiently guided to the throughholes stator vanes 67 a may be included in the rotational direction of theimpeller 70. In this case, exhaust air including the swirling component in the rotational direction of theimpeller 70 can be guided to the throughholes - The second guide paths D2 that guide exhaust air discharged from the
impeller 70 to the outer side in the radial direction and discharge to the outer side of themotor 10 are provided between theinner guide portions 67 in the circumferential direction, as illustrated inFIG. 9 . The second guide paths D2 are positioned between an outerperipheral face 66 e of thepartitioning ring 66 b and an innerperipheral face 65 a of the outer peripherycylindrical portion 65, as illustrated inFIG. 11 .Third vents 95 are provided at the lower end of the second guide paths D2. The third vents 95 turn the exhaust air that has passed through the second guide paths D2 downward, and discharge to the outer side of themotor 10. This exhaust air flows between the outer peripheral face of themotor 10 and an innerperipheral face 19 a of acasing 19 that accommodates themotor 10, and finally is discharged from a later-describedfinal vent 17 b (seeFIG. 2 ). - The outer
peripheral face 66 e of thepartitioning ring 66 b has an inner-sideinclined portion 66 d that progressively hangs out toward the outer side in the radial direction the closer to the lower side it is. On the other hand, the innerperipheral face 65 a of the outer peripherycylindrical portion 65 has an outer-sideinclined portion 65 b where the thickness of the outer peripherycylindrical portion 65 is thinner at the lower end. Due to these inner-sideinclined portion 66 d and outer-sideinclined portion 65 b being provided, the second guide paths D2 travel to the outer side in the radial direction while maintaining the width in the radial direction as they head toward the lower side. The cross-sectional area of the second guide paths D2 in places perpendicular to the axial direction gradually increases the closer to the third vents 95. Accordingly, the discharge sound of air being discharged from thethird vents 95 can be reduced. Also, the discharge efficiency at the time of air being discharged from thethird vents 95 is improved. - The
impeller 70 is attached to theshaft 31 at the upper side from thestator 40. Theimpeller 70 discharges fluid suctioned from anintake port 70 a that is opened toward the upper side, toward the outer side in the radial direction via internal flow paths, as illustrated inFIG. 2 . Theimpeller 70 has an impellermain body 71 and animpeller hub 72. - The impeller
main body 71 has abase portion 73, multiple movingblades 74, and ashroud 75. Thebase portion 73 is disc-shaped, and has a throughhole 73 a passing through in the axial direction at the middle portion. The perimeter of the throughhole 73 a of thebase portion 73 is aninclined portion 73 b that has a conical face shape extending at the upper side. The movingblades 74 are plate-shaped members curved in the circumferential direction, that extend from the inner side in the radial direction toward the outer side on the upper face of thebase portion 73. The movingblades 74 are disposed erected following the axial direction. Theshroud 75 is a cylindrical shape that tapers toward the upper side in the axial direction. An opening portion at the middle of theshroud 75 is theintake port 70 a of theimpeller 70. Thebase portion 73 andshroud 75 are linked by the movingblades 74. -
FIG. 12 is a plan view of the movingblades 74 of theimpeller 70. - The multiple moving
blades 74 are disposed following the circumferential direction (θz direction) on the upper face of thebase portion 73, as illustrated inFIG. 12 . The movingblades 74 are erected perpendicularly from the upper face of thebase portion 73 following the axial direction, as illustrated inFIG. 2 . - In the present embodiment, three types of moving blades are disposed, with the same types of moving blades being equidistantly disposed in the circumferential direction. The multiple moving
blades 74 in the present embodiment include multiple (three) first movingblades 74 a, multiple (three) second moving blades 74 b, and multiple (six) third movingblades 74 c. The three first movingblades 74 a are disposed at equidistantly every 120° in the circumferential direction. The second moving blades 74 b are each disposed between first movingblades 74 a adjacent in the circumferential direction. The three second moving blades 74 b are also disposed equidistantly every 120° in the circumferential direction. The third movingblades 74 c are each disposed between first movingblades 74 a and second moving blades 74 b adjacent in the circumferential direction. The six third movingblades 74 c are disposed equidistantly every 60° in the circumferential direction. - The moving
blades 74 extend on the upper face of thebase portion 73 having a curvature in plan view (XY plane view). One end of the movingblades 74 is positioned on an outer edge of thebase portion 73. The other end of each movingblade 74 is positioned on the inner side of the outer edge of thebase portion 73 in the radial direction. - That is to say, the end portions of each of the first moving
blades 74 a, the second moving blades 74 b, and the third movingblades 74 c, at the outer side in the radial direction, are all positioned on the outer edge of thebase portion 73. On the other hand, end portions P1 of the first movingblades 74 a on the inner side are positioned closest to the center of thebase portion 73. End portions P2 of the second moving blades 74 b on the inner side are positioned on the outer side in the radial direction from the end portions P1 of the first movingblades 74 a. End portions P3 of the third movingblades 74 c on the inner side are positioned further on the outer side in the radial direction from the end portions P2 of the second moving blades 74 b. - The first moving
blades 74 a, the second moving blades 74 b, and the third movingblades 74 c, each have a shape that is curved like a bow in a counterclockwise direction. - The first moving
blades 74 a are each formed of four arcs that are different in radius of curvature. A projectingblade face 74 d of the first movingblades 74 a has three inflection points CP11, CP12, and CP13, in the longitudinal direction. - The second moving blades 74 b are each formed of three arcs that are different in radius of curvature. A projecting blade face 74 e of the second moving blades 74 b has two inflection points CP21 and CP22 in the longitudinal direction.
- The third moving
blades 74 c are each formed of two arcs that are different in radius of curvature. A projectingblade face 74 f of the third movingblades 74 c has one inflection point CP31 in the longitudinal direction. - In the present embodiment, the inflection point CP11 of each first moving
blade 74 a, the inflection point CP21 of each second moving blade 74 b, and the inflection point CP31 of each third movingblade 74 c, are each disposed at the same radius position C1 on thebase portion 73. Further, the radius of curvature of a portion of each first movingblade 74 a that is further on the outer side of the radial position C1, the radius of curvature of a portion of each second moving blade 74 b that is further on the outer side of the radial position C1, and the radius of curvature of a portion of each third movingblade 74 c that is further on the outer side of the radial position C1, are the same as each other. - Next, the inflection point CP12 of each first moving
blade 74 a, the inflection point CP22 of each second moving blade 74 b, and the end portion P3 of each third movingblade 74 c are each disposed at the same radius position C2 on thebase portion 73. Further, the radius of curvature of a portion of each first movingblade 74 a that is disposed between the radial position C1 and the radial position C2, the radius of curvature of a portion of each second moving blade 74 b disposed between the radial position C1 and the radial position C2, and the radius of curvature of a portion of each third movingblade 74 c that is disposed between the radial position C1 and the radial position C2, are the same as each other. - Next, the inflection point CP13 of each first moving
blade 74 a and the end portion P2 of each second moving blade 74 b are disposed at the same radius position C3 on thebase portion 73. Further, the radius of curvature of a portion of each first movingblade 74 a that is disposed between the radial position C2 and the radial position C3 and the radius of curvature of a portion of each second moving blade 74 b disposed between the radial position C2 and the radial position C3 are the same as each other. - The radius of curvature of the blade faces 74 d to 74 f of the moving blades 74 (74 a through 74 c) in the present embodiment are different for each region of the
impeller 70 in the radial direction. Meanwhile, portions of different types of moving blades (the first movingblades 74 a through third movingblades 74 c) that belong to the same region in the radial direction are set to have the same radius of curvature. - In the present embodiment, the radial position C3 agrees with the
intake port 80 a of theimpeller housing 80 as seen in the axial direction. Accordingly, only the portions of the first movingblades 74 a further on the inner side than the inflection point CP13 are disposed inward of theintake port 80 a. - The
impeller hub 72 includes acylindrical portion 72 a that extends in the axial direction, a disc-shapedflange portion 72 b that extends outwards in the radial direction from the lower portion of the outer face of thecylindrical portion 72 a, and multiple projectingportions 72 c that protrude upwards from the upper face of theflange portion 72 b. Thecylindrical portion 72 a includes a taperedinclined face portion 72 d that becomes tapered toward the tip portion at the upper side. - The
impeller hub 72 is attached to the impellermain body 71 by inserting thecylindrical portion 72 a into the throughhole 73 a of thebase portion 73 from the lower side. Thecylindrical portion 72 a may be press-fitted into the throughhole 73 a, or may be fixed using an adhesive agent or the like. Theflange portion 72 b of theimpeller hub 72 supports the impellermain body 71 from the lower side. The projectingportions 72 c on theflange portion 72 b are fitted into recesses 73 c on the lower face of thebase portion 73. Fitting the projectingportions 72 c into the recesses 73 c suppresses relative movement of the impellermain body 71 and theimpeller hub 72 in the circumferential direction. - Due to the
impeller hub 72 including theflange portion 72 b, theflange portion 72 b can support the impellermain body 71 over a wide area in the radial direction from below. Accordingly, theimpeller 70 can be held in a stable manner, and stability at the time of high-speed rotation is increased. - The
inclined face portion 72 d at the tip of thecylindrical portion 72 a of theimpeller hub 72 and theinclined face portion 73 b of thebase portion 73 are smoothly connected to each other in the vertical direction in theimpeller 70. Theinclined face portion 72 d and theinclined face portion 73 b make up a ring-shaped inclined face 70 b that guides fluid suctioned from theintake port 70 a of theimpeller 70 to the outer side in the radial direction. - Configuring the ring-shaped inclined face 70 b from the impeller
main body 71 and theimpeller hub 72 enables the maximum height of the ring-shaped inclined face 70 b to be increased by increasing the length of thecylindrical portion 72 a (inclined face portion 72 d) without increasing the height of theinclined face portion 73 b of thebase portion 73. Accordingly, a ring-shaped inclined face 70 b having a preferable shape can be realized while suppressing increase in thickness of thebase portion 73. - The
impeller hub 72 is preferably made of metal. In this case, theshaft 31 and theimpeller 70 can be strongly linked to each other. Accordingly, theimpeller 70 can be rotated at high speeds in a stable manner. Moreover, a metal face can be used as theinclined face portion 72 d, and accordingly the surface of the upper tip of the ring-shaped inclined face 70 b can be smoothed. - The
impeller 70 is fixed to theshaft 31 by fitting the upper end portion of theshaft 31 into thecylindrical portion 72 a of theimpeller hub 72 from the lower side. As illustrated inFIG. 2 , theimpeller 70 connected to theshaft 31 is disposed at the inner side of the ring-shaped protrudingportion 66 c of the exhaustair guide member 60. Accordingly, the protrudingportion 66 c is disposed nearby avent 70 c of theimpeller 70. - The protruding
portion 66 c guides exhaust air discharged from theimpeller 70 to the lower side, along with a later-describedexhaust air guide 83 of theimpeller housing 80. In the present embodiment, the outer peripheral face of the ring-shaped protrudingportion 66 c is an inclined face that is inclined downwards the further on the outer side in the radial direction it is. The outer peripheral face of the protrudingportion 66 c is a smooth convex curved face toward the outer side. - The lower end of the outer peripheral face of the protruding
portion 66 c is smoothly connected to the outer peripheral face of thecylindrical partitioning ring 66 b. Accordingly, the inclination angle as to a direction perpendicular to the axial direction is approximately 90° at the lower end of the protrudingportion 66 c. The upper end of the protrudingportion 66 c is positioned on the immediately outer side in the radial direction of the outer edge of thebase portion 73 of theimpeller 70. The upper end of the protrudingportion 66 c is positioned at the upper side from the lower face of thebase portion 73, but is positioned at the lower side from the upper face of the outer edge of thebase portion 73. - In the
blower 1 according to the present embodiment, air discharged from theimpeller 70 can be smoothly guided downwards without turbulence in the flow, due to the protrudingportion 66 c having the above-described shape and placement. At the lower end of thevent 70 c of theimpeller 70, air is discharged from the outer edge of thebase portion 73 in a direction approximately perpendicular to the axial direction. The upper end of the protrudingportion 66 c is at a position lower than the upper face of thebase portion 73 in the present embodiment, so the discharged air is guided following the other peripheral face of the protrudingportion 66 c without colliding with the protrudingportion 66 c. Accordingly, air can be conveyed efficiently. - The
impeller housing 80 has theintake port 80 a on the upper side, and has the shape of a cylinder that is tapered toward the upper side in the axial direction, as illustrated inFIG. 2 . Theimpeller housing 80 has anintake guide portion 81 positioned at the opening end of theintake port 80 a, an impeller housingmain body 82 that accommodates theimpeller 70, anexhaust air guide 83 extending from the outer peripheral edge of the impeller housingmain body 82 toward the outer side in the radial direction and toward the lower side, in a form like a skirt, and an outerperiphery attachment ring 84 that extends toward the upper side from the outer peripheral edge of theexhaust air guide 83. - The impeller housing
main body 82 has a cross-sectional shape modeled after that of theshroud 75 of theimpeller 70. The inner face (lower face) of the impeller housingmain body 82 faces the outer face (upper face) of theshroud 75 across a uniform spacing. - The ring-shaped
intake guide portion 81 that protrudes toward the inner side in the radial direction is positioned on the upper end of the inner peripheral side of the impeller housingmain body 82. Theintake guide portion 81 covers an upper end face 75 b of theshroud 75 from above, as illustrated inFIG. 10 . A narrow gap runs in the radial direction between the lower face of theintake guide portion 81 and the upper end face 75 b of theshroud 75. - A peripheral
edge bend portion 82 a, bent to wrap around the outer peripheral end of theshroud 75, is provided to the end of the impeller housingmain body 82 at the outer peripheral side. The peripheraledge bend portion 82 a extends to the lower side and encompasses the outer side end face of theshroud 75 from the outer side in the radial direction. A narrow gap extending to the upper side in the axial direction runs between the inner peripheral face of the peripheraledge bend portion 82 a and the outer side end face of theshroud 75. - The
exhaust air guide 83 makes up an exhaustair flow path 92 that guides exhaust air, discharged to the outer side in the radial direction from theimpeller 70, toward the lower side, as illustrated inFIG. 10 andFIG. 11 . The inner peripheral face of theexhaust air guide 83 smoothly inclines from a direction perpendicular to the axial direction toward the axial direction, from the upper end toward the lower end. The inner peripheral face of theexhaust air guide 83 is gently connected and the lower end to the innerperipheral face 65 a of the outer peripheralcylindrical portion 65 of the exhaustair guide member 60, thereby making up a wall face at the outer peripheral side of the exhaustair flow path 92. - The outer
periphery attachment ring 84 is cylindrical in shape. The outerperiphery attachment ring 84 has aflange portion 84 a extending from the upper end toward the outer side in the radial direction. The outer peripheral face of the outerperiphery attachment ring 84 fits to the inner peripheral face of the outer peripherycylindrical portion 65 of the exhaustair guide member 60. Theflange portion 84 a also comes into contact with the upper end of the outer peripherycylindrical portion 65 and positions theimpeller housing 80 as to the exhaustair guide member 60 in the vertical direction. - A
recess 86 that extends in the circumferential direction is provided on the upper face of theexhaust air guide 83. Therecess 86 is made up of the peripheraledge bend portion 82 a,exhaust air guide 83, and outerperiphery attachment ring 84. The thickness of theexhaust air guide 83 is made uniform due to therecess 86 having been provided to theimpeller housing 80. Moreover,ribs 85 that connect the outerperiphery attachment ring 84 to the peripheraledge bend portion 82 a of the impeller housingmain body 82 in the radial direction are provided in therecess 86. - The
impeller housing 80 is produced by molding. That is to say, theimpeller housing 80 is manufactured by injecting a material in a fluid state into a cavity between two or more molds, which is then hardened. Theimpeller housing 80 according to the present embodiment is made of a resin material, and is fabricated by injection molding. In a case of forming theimpeller housing 80 of an aluminum alloy, theimpeller housing 80 is fabricated by aluminum die-casting. The molded article manufactured by molding may exhibit sink marks on the surface of thick portions, due to shrinkage when the material hardens, and this may deteriorate dimensional precision. In the case of performing aluminum die-casting, air pockets (cavities) may occur within thick portions, and this may deteriorate strength. - The
recess 86 is provided between the outerperiphery attachment ring 84 and the peripheraledge bend portion 82 a of the impeller housingmain body 82 of theimpeller housing 80 according to the present embodiment. Thus, the thickness of theexhaust air guide 83 can be made uniform in theimpeller housing 80, thereby suppressing occurrence of sink marks from occurring on the periphery of theexhaust air guide 83. In the same way, air pockets can be suppressed from occurring within theexhaust air guide 83 of theimpeller housing 80. Further, theribs 85 are provided to therecess 86 of theimpeller housing 80 according to the present embodiment, so rigidity of the outerperiphery attachment ring 84 as to the impeller housingmain body 82 can be increased. Accordingly, theimpeller housing 80 can be strongly fixed to the exhaustair guide member 60 at the outerperiphery attachment ring 84. - The
board case 15 is attached to the lower side of themotor 10, and encompasses thecontrol board 11, as illustrated inFIG. 1 andFIG. 2 . Theboard case 15 has a disc-shapedbase wall 16, and acylindrical portion 17 that extends upward from the outer edge of thebase wall 16. Thecylindrical portion 17 is provided with thefinal vent 17 b that passes through theboard case 15 in the radial direction so the inner side and the outer side communicate. Thefinal vent 17 b merges and discharges air discharged from the vents (first vents 96, second vents 97, and third vents 95). -
FIG. 13 is a side view of themotor 10. - An upper end face 17 a of the
cylindrical portion 17 is inclined in a spiral form centered on the central axis J, as illustrated inFIG. 1 andFIG. 13 . The upper end face 17 a progressively inclines in the same direction as the rotation direction of theimpeller 70 toward the lower side. Thefinal vent 17 b is positioned at the lower end side of the spiral of the upper end face 17 a. Exhaust air discharged from thethird vents 95 of the exhaustair guide member 60 flows downwards between the outer peripheral face of themotor 10 and the innerperipheral face 19 a of thecasing 19 accommodating themotor 10. Upon reaching the upper end face 17 a of thecylindrical portion 17, this exhaust air follows the incline of the upper end face 17 a, swirls and reaches thefinal vent 17 b, and is discharged. The upper end face 17 a guides exhaust air including the swirling component that is discharged obliquely downwards from thethird vents 95 to thefinal vent 17 b without changing the direction of flow at an abrupt angle, so deterioration of venting efficiency can be reduced. - At least one
third vent 95 of the multiplethird vents 95 is positioned directly above thefinal vent 17 b. Thethird vent 95 that is positioned directly above thefinal vent 17 b will be referred to as a direct-above vent 95A here. An uppermost end 17 c of the upper end face 17 a is positioned at the lower side of theinner guide portion 67 in the present embodiment. Accordingly, exhaust air discharged from the direct-above vent 95A is not guided to the upper end face 17 a, but rather passes over a distance that is shorter than being guided to the upper end face 17 a and is discharged from thefinal vent 17 b, and thus can improve the discharge efficiency from the direct-above vent 95A. - The upper end face 17 a in the present embodiment has been exemplarily illustrated with regard to a case where the inclination along the circumferential direction is constant. However, the upper end face 17 a may be an inclined face of which the inclination changes along the circumferential direction. In this case, the upper end face 17 a preferably is an inclined face where the angle of inclination gradually becomes gentler from the upper side toward the lower side. For example, the upper end face 17 a may be a curved face that is convex toward the lower side, with the radial center of curvature of the curved face that the upper end face makes up being positioned at the upper side from the upper end face 17 a. Accordingly, exhaust air flowing toward the lower side may be made to gradually swirl following the upper end face 17 a, and be guided to the
final vent 17 b, whereby discharge efficiency can be improved. - The
control board 11 is connected to coil lines extending from thecoils 42, and thesensor board 50, and controls themotor 10. Thecontrol board 11 is attached to the lower side of themotor 10 in a stage of being inclined as to thelower lid 22, via multiple (three in the present embodiment)post-shaped members 13 fixed to thelower lid 22, as illustrated inFIG. 2 . Thepost-shaped members 13 are fixed by screwing to screwholes 22 d in thelower lid 22. The multiplepost-shaped members 13 each have different heights. Also, inclined faces are provided to the lower side end faces of thepost-shaped members 13. Thecontrol board 11 is fixed by screwing to the lower side end faces of thepost-shaped members 13 viaspacers 13 a. - The
control board 11 is inclined toward thefinal vent 17 b of theboard case 15, within theboard case 15. That is to say, the lowest point of thecontrol board 11 is positioned toward thefinal vent 17 b side. - Exhaust air that has passed through the interior of the
motor 10 and been discharged to the lower side of themotor 10 from thefirst vents 96 andsecond vents 97 strikes thecontrol board 11 and cools thecontrol board 11. Further, exhaust air that has struck anupper face 11 a of thecontrol board 11 is smoothly discharged to thefinal vent 17 b following the inclination of thecontrol board 11. That is to say, venting efficiency can be increased due to thecontrol board 11 being inclined toward thefinal vent 17 b. Further, the projection area of thecontrol board 11 as viewed from the axial direction can be reduced by disposing thecontrol board 11 in an inclined manner. Accordingly, the gap between the outer edge of thecontrol board 11 and the inner peripheral face of thecylindrical portion 17 of theboard case 15 can be increased to let exhaust air flow to alower face 11 b side of thecontrol board 11. Accordingly, even in a case where mounted parts that generate a great amount of heat, such as capacitors or the like, are mounted on thelower face 11 b of thecontrol board 11, these can be efficiently cooled. - The position of the
control board 11 in the axial direction preferably is close, within a range where there is no interference between theupper face 11 a of thecontrol board 11 and the mounted parts mounted on theupper face 11 a, and thelower lid 22 of themotor 10. Accordingly, not only is the cooling efficiency of thecontrol board 11 improved, but also the effect of the exhaust air being guided to thefinal vent 17 b due to the inclination of thecontrol board 11 can be increased. - The
blower 1 according to the present embodiment draws air onto theimpeller 70 from theintake port 80 a by rotating theimpeller 70 by themotor 10, and discharges air to the outer side in the radial direction via air flow paths within theimpeller 70, as illustrated inFIG. 2 . The exhaust air discharged from theimpeller 70 passes through the exhaustair flow path 92 and flows into the exhaustair guide member 60. The exhaustair flow path 92 is positioned between the inner peripheral face of theexhaust air guide 83 of theimpeller housing 80 and the outer peripheral face of the protrudingportion 66 c, and directs exhaust air, discharged toward the outer side in the radial direction by theimpeller 70, toward the lower side. The exhaust air flowing toward the lower side of the exhaustair flow path 92 is branched into and flows through first guide paths D1 and second guide paths D2 alternately positioned in the circumferential direction of the exhaustair guide member 60. - Exhaust air passing through the first guide paths D1 is guided further to the inner side in the radial direction than the inner
peripheral face 67 b of theinner guide portion 67, and is rectified by thestator vanes 67 a and flows to the interior of themotor 10 through the throughholes FIG. 10 . - The exhaust air that has flowed into the interior of the
motor 10 via the throughholes 25 flows into the air flow paths FP between thestator 40 andhousing 20 illustrated inFIG. 7 . The exhaust air flows toward the lower side in the air flow paths FP. The upper-side inclined protrudingportions 43 g of the upper-side insulators 43 and the lower-side inclined protruding portions 44 g of the lower-side insulators 44 direct the swirling component of the exhaust air toward the lower side within the air flow paths FP, as illustrated inFIG. 5 . The outer peripheral faces of thelinear portions 41 c (stator core 41) are exposed within the air flow paths FP, and are cooled by the exhaust air.Multiple plate portions 45 are disposed within the air flow paths FP, and rectify the exhaust air flowing through the air flow paths FP. Exhaust air that has passed through the air flow paths FP is discharged downwards from the lower-side openings 24 serving as the first vents 96. - The exhaust air that has flowed into the
motor 10 via the throughholes 26 flows to the inner side of thestator 40 via the gaps CL as illustrated inFIG. 7 . The first side faces 43 b and second side faces 43 c and inclinedmembers 46 encompassing the gaps CL guide the exhaust air passing through the gaps CL to the exhaust guide holes 48 of the moldedportion 47. According to this configuration, thecoils 42, which are heat generators in themotor 10, can be cooled. In addition, the exhaust air can be efficiently guided toward the lower side by the exhaust guide holes 48 of the moldedportion 47. The exhaust air discharged toward the lower side from the exhaust guide holes 48 is discharged downwards from the throughholes 22 a serving as the second vents 97. - The exhaust air discharged from the
first vents 96 andsecond vents 97 strikes theupper face 11 a of thecontrol board 11 fixed in an inclined manner and cools thecontrol board 11, and further is guided toward to thefinal vent 17 b of theboard case 15 following theupper face 11 a of thecontrol board 11 and is discharged. - On the other hand, exhaust air passing through the second guide paths D2 moves to the outer side in the radial direction due to the inner-side
inclined portion 66 d of thepartitioning ring 66 b, and is discharged to the lower side via thethird vents 95, as illustrated inFIG. 11 . The exhaust air discharged to the lower side from thethird vents 95 flows toward the lower side following the outer peripheral face of thehousing 20 of themotor 10. Part of the exhaust air that flows along the outer peripheral face of thehousing 20 swirls in spiral form following the upper end face 17 a of theboard case 15, and is guided to thefinal vent 17 b and discharged, as illustrated inFIG. 13 . Due to the upper end face 17 a being included in a direction matching the rotational direction of theimpeller 70, the exhaust air that is discharged from thethird vents 95 and that includes the swirling component in the rotational direction of theimpeller 70 and be efficiently guided to thefinal vent 17 b following the outer peripheral face of themotor 10. Part of the exhaust air flowing along the outer peripheral face of thehousing 20 passes over a distance shorter than having been guided by the upper end face 17 a, and reaches thefinal vent 17 b without passing over the upper end face 17 a, and is discharged. - Next, a
blower 301 having a hollow member (flow path forming member) 347 instated of the moldedportion 47 in the above-described embodiment, will be described as a first modification with reference toFIG. 16 . Components that are of the same form as in the above-described embodiment are denoted by the same reference symbols, and description thereof will be omitted. - A
stator 340 of theblower 301 has multiple (three) hollow members (flow path forming member) 347. Thehollow members 347 are U-shaped with a cross-section taken at a plane orthogonal to the central axis opens to the outer side in the radial direction, with the inner side of the U-shape being hollow. Thehollow members 347 are positioned on the inner side of the core backportion 41 a in the radial direction. Thehollow members 347 are positioned betweencoils 42 arrayed in the circumferential direction. Thehollow members 347 make up exhaust guide holes (flow paths) 348 extending in the vertical direction at the inner side of the core backportion 41 a in the radial direction. - The
hollow members 347 according to the present modification are disposed by inserting preformed resin materials betweencoils 42 arrayed in the circumferential direction. According to the present modification, thehollow members 347 can easily configure the exhaust guide holes 348 extending in the axial direction. Accordingly, theblower 301 can cool the interior of themotor 10 via thehollow members 347, and can raise discharge efficiency. - A second modification of the above-described embodiment will be described with reference to the drawings.
-
FIG. 17 is a longitudinal-sectional view of a centrifugal air blower (blower) 1001 according to the second modification. Thiscentrifugal air blower 1001 is a turbo-type centrifugal fan that suctions air from above, from suction holes provided on an upper portion, and discharges downwards. Turbo-type centrifugal fans are more efficient and less noisy as compared to sirocco centrifugal fans. - The
centrifugal air blower 1001 according to the present modification is provided to a canister-type vacuum cleaner, for example, and is used to generate suction force for the vacuum cleaner. Note however, that the centrifugal air blower according to the present disclosure may be used in usages other than vacuum cleaners. For example, the centrifugal air blower according to the present disclosure may be installed in other air blowers such as air supply/exhaust devices used as range hood fans or ducts in buildings, home electrical appliances, medical equipment, industrial large-scale facilities, and so forth, to perform suction and exhaust. - The
centrifugal air blower 1001 includes amotor 1011, animpeller 1012, and ablower casing 1013, as illustrated in FIG. 17. A later-described rotating portion (rotor) 1030 of themotor 1011 and theimpeller 1012 rotate entered on acentral axis 1009. Themotor 1011 has the rotating portion (rotor) 1030 and a stationary portion 1020. The stationary portion 1020 further includes astator 1021. Theblower casing 1013 has a lower-side casing (housing) 1135. That is to say, thecentrifugal air blower 1001 has therotor 1030, stator 1040, lower-side casing (housing) 1135, andimpeller 1012. - The lower-
side casing 1135 accommodates therotating portion 1030 and stationary portion 1020. Amiddle casing 1134 is positioned at the upper side of the lower-side casing 1135. The lower-side casing 1135 has a cylindrical shape extending in the axial direction and opening at the upper side. That is to say, the lower-side casing 1135 has a through hole that passes through the upper side in the vertical direction and opens to the inner side. The through hole of the lower-side casing 1135 connects to alter-describedgap 1090. - The
motor 1011 is an inner-rotor type brushless DC motor. Themotor 1011 has the stationary portion 1020 and rotating portion (rotor) 1030. The stationary portion 1020 is stationary in relation to theblower casing 1013. The rotatingportion 1030 is rotatably supported as to the stationary portion 1020, centered on thecentral axis 1009. - The stationary portion 1020 has the
stator 1021, a motor cover 1022, abase plate 1023, acircuit board 1024, anupper bearing 1025, and a lower bearing 1026. The rotatingportion 1030 has ashaft 1031 and arotor 1032. - The
stator 1021 generates magnetic flux in accordance with driving voltage supplied from thecircuit board 1024. Thestator 1021 is disposed at the periphery of the later-describedrotor 1032. Thestator 1021 hasmultiple core pieces 1060,multiple insulators 1070, andmultiple coils 1080. - The
core pieces 1060 are disposed in a ring form around thecentral axis 1009. Thecore pieces 1060 have a core back 1061 extending in the circumferential direction, andteeth 1062 that protrude from the core back 1061 toward the inner side in the radial direction. Theinsulators 1070 are attached to thecore pieces 1060. Thecoils 1080 are configured of conducting wires wound around theteeth 1062 via theinsulators 1070. Further detailed structures of thestator 1021 will be described later. - The motor cover 1022 is a resin member that holds the
stator 1021. The motor cover 1022 anupper plate portion 1221, aside plate portion 1222, a first fixing portion 1223, asecond fixing portion 1224, and at least one baseplate fixing portion 1225. - The
upper plate portion 1221 is a plate-shaped member that extends generally perpendicular to thecentral axis 1009 above thestator 1021. A through hole is formed at the generally middle portion of theupper plate portion 1221. Theupper bearing 1025 is held in this through hole in theupper plate portion 1221. Theside plate portion 1222 is a generally cylindrical shape, and extends from the edge of theupper plate portion 1221 downward in the axial direction. - The base
plate fixing portion 1225 protrudes toward the outer side in the radial direction from around the lower end portion of theside plate portion 1222. At least one screw hold is formed in the baseplate fixing portion 1225. Baseplate fixing portions 1225 are provided at three positions in the circumferential direction in themotor 1011 according to the present modification. Note however, that the number of positions of fixing the motor cover 1022 andbase plate 1023 is not restricted to three positions, and may be two positions, or four positions or more. Also, the motor cover 1022 andbase plate 1023 may be fixed by other methods, such as adhesion, crimping, or the like. The structures of the first fixing portion 1223 andsecond fixing portion 1224 will be described later. - The
base plate 1023 is a member covering at least part of the lower opening of the motor cover 1022. Thebase plate 1023 extends generally perpendicular to thecentral axis 1009. A recess is formed at the middle of thebase plate 1023. The lower bearing 1026 is held in this recess in thebase plate 1023. Thestator 1021,circuit board 1024,upper bearing 1025, lower bearing 1026, androtor 1032, are accommodated in the interior of a casing configured of the motor cover 1022 andbase plate 1023. - The
circuit board 1024 is generally plate shaped in the present modification. Thecircuit board 1024 is positioned generally perpendicular to thecentral axis 1009, further toward the lower side than thestator 1021. Electronic parts making up an electric circuit for supplying driving current to thecoils 1080 are mounted on thecircuit board 1024. The ends of conducting wires making up thecoils 1080 are electrically connected to the electric circuit on thecircuit board 1024. - The
upper bearing 1025 rotatably supports theshaft 1031 as to the motor cover 1022. The lower bearing 1026 rotatably supports theshaft 1031 as to thebase plate 1023. Ball bearings, where ball-shaped rolling members are interposed between an inner ring and an outer ring, are used for theupper bearing 1025 and lower bearing 1026, for example. Anelastic member 1027 is interposed between the motor cover 1022 and theupper bearing 1025. Accordingly, the vibration when themotor 1011 andimpeller 1012 rotate is reduced. Note that bearings of types other than ball bearings may be used for theupper bearing 1025 and lower bearing 1026. - The
shaft 1031 is disposed along the vertically-extendingcentral axis 1009. More specifically, theshaft 1031 is a post-shaped member disposed along thecentral axis 1009. Theshaft 1031 is supported by theupper bearing 1025 and lower bearing 1026, and can rotate centered on thecentral axis 1009. The upper end of theshaft 1031 protrudes further to the upper side than the motor cover 1022. Theimpeller 1012 is directly fixed at the upper end of theshaft 1031. Although theimpeller 1012 is fixed at the upper end of theshaft 1031 in the present modification, theimpeller 1012 may be indirectly fixed to theshaft 1031, via another member such as a cylindrical member made of a resin material or metal material, or the like. - The
rotor 1032 is fixed to theshaft 1031, and rotates centered on thecentral axis 1009 along with theshaft 1031. Therotor 1032 according to the present modification is made of a magnetic resin formed in a generally cylindrical shape. The outer peripheral face of therotor 1032 is magnetized with N poles and S poles alternately in the circumferential direction. The outer peripheral face of therotor 1032 faces the end face of theteeth 1062 at the inner side in the radial direction, across a minute gap. That is to say, therotor 1032 has magnetic faces facing thestator 1021 in the radial direction. - Note that although a
rotor 1032 made of magnetic resin is used in the present modification, therotor 1032 may be an arrangement where multiple magnets are fixed on the outer peripheral face or the inside of a cylindrical rotor core that is a magnetic material. - When driving the
motor 1011, driving current is supplied to thecoils 1080 from a power source via the electric circuit on thecircuit board 1024, and magnetic fluxes are generated at themultiple teeth 1062. Accordingly, torque is generated on the circumferential direction die to the magnetic fluxes acting between heteeth 1062 androtor 1032. As a result, the rotatingportion 1030 rotates centered on thecentral axis 1009. Theimpeller 1012 also rotates along with the rotation of therotating portion 1030. - The
impeller 1012 is a so-called turbo-type centrifugal impeller. Theimpeller 1012 is disposed above the motor cover 1022 of themotor 1011. Theimpeller 1012 has anupper shroud 1051, alower shroud 1052, andmultiple blades 1053, as illustrated inFIG. 17 . - The
upper shroud 1051 includes acylindrical portion 1511, asleeve portion 1512, and asuction port 1513. Theupper shroud 1051 is disposed above thelower shroud 1052 andmultiple blades 1053. - The
cylindrical portion 1511 is a generally cylindrical member centered on thecentral axis 1009. Thecylindrical portion 1511 according to the present modification has a diameter that is generally constant regardless of the position in the axial direction. Note that thecylindrical portion 1511 may have a shape where the diameter progressively increases toward the lower side in the axial direction. - The
sleeve portion 1512 expands toward the outer side in the radial direction from the lower end of thecylindrical portion 1511. The radial position of the outer edge of thesleeve portion 1512 is generally the same as the position of the outer edge of thelower shroud 1052 in the radial direction. Thesuction port 1513 is positioned at the middle of theupper shroud 1051. Thesuction port 1513 is formed of thecylindrical portion 1511 and passes in the axial direction through theupper shroud 1051 at the inner side of thecylindrical portion 1511 in the radial direction. - The
lower shroud 1052 is a plate-shaped member that extends generally perpendicular to thecentral axis 1009, above the motor cover 1022. The lower face of thelower shroud 1052 facings the upper face of the motor cover 1022 in the axial direction. The tip on the inner side in the radial direction of thelower shroud 1052 is fixed to theshaft 1031 of themotor 1011. - The
blades 1053 are disposed between theupper shroud 1051 and thelower shroud 1052 in the axial direction. Themultiple blades 1053 are disposed generally equidistantly in the circumferential direction. When driving thecentrifugal air blower 1001, gas between theupper shroud 1051 andlower shroud 1052 is accelerated to the outer side in the radial direction by themultiple blades 1053. - An upper-
side casing 1133 has atop plate portion 1131 and awall portion 1132. Thetop plate portion 1131 is positioned above theimpeller 1012, and extends in a ring shape following the upper face of theupper shroud 1051. Thetop plate portion 1131 has amiddle hole 1130 at the middle thereof. Themiddle hole 1130 is connected to the above-describedsuction port 1513. Thewall portion 1132 extends downwards in a cylindrical form from thetop plate portion 1131 at the outer side of themotor 1011 in the radial direction. At least the upper end of themotor 1011 and theimpeller 1012 are accommodated on the inner side of thewall portion 1132 in the radial direction. That is to say, thewall portion 1132 encompasses at least part of themotor 1011. The inner side face of thewall portion 1132 faces at least part of themotor 1011 in the radial direction. - The
blower casing 1013 according to the present modification is formed from three ring-shaped members, which are the upper-side casing 1133,middle casing 1134, and lower-side casing 1135. Themiddle casing 1134 is disposed beneath the upper-side casing 1133. The lower-side casing 1135 is disposed beneath themiddle casing 1134. The upper-side casing 1133 includes the upper end of thetop plate portion 1131 andwall portion 1132. Themiddle casing 1134 and lower-side casing 1135 are cylindrical members forming thewall portion 1132. Theblower casing 1013 according to the present modification has been described as being formed of three members, but theblower casing 1013 may be formed of one member, or may be formed of two, or four or more members. That is to say, theblower casing 1013 is formed of at least one member. - The outer peripheral face of the motor cover 1022 and the inner peripheral face of the
wall portion 1132 of theblower casing 1013 are disposed across a gap in the radial direction. The gap between the outer peripheral face of the motor cover 1022 and the inner peripheral face of thewall portion 1132 serves as aflow path 1010 of gas when driving thecentrifugal air blower 1001. At least part of theflow path 1010 connects to a vent that thewall portion 1132 has. - A
communication hole 1100 that connects the outside and inside of the motor cover 1022 is formed in the motor cover 1022 in this space or below this space in the axial direction, thecommunication hole 1100 communicating with a gap (flow path) 1090. - The
gap 1090 has a generally triangular shape or generally trapezoidal shape in plan view. Thegap 1090 is positioned on the inner side of the core back 1061 in the radial direction. Thegap 1090 has anupper opening 1090 a positioned at the upper side of the core back 1061, and alower opening 1090 b positioned at the lower side of the core back 1061. Theupper opening 1090 a opens toward the upper side in the axial direction. thelower opening 1090 b opens toward the lower side in the axial direction. Thus, air can be efficiently guided from theupper opening 1090 a toward thelower opening 1090 b. The width of thegap 1090 in the circumferential direction progressively decreases toward the inner side in the radial direction. Accordingly, the flow speed of the air flow passing through the region of thegap 1090 at the inner side on the radial direction becomes fast, so the cooling effect is high even if the amount of air supplied is small. Also, a great amount of air can pass through the region of thegap 1090 at the outer side in the radial direction, so cooling effects are high. Thegap 1090 may be connected to a throughhole 1221 a provided to theupper plate portion 1221 of the motor cover 1022 and pass through in the vertical direction, not only being connected to thecommunication hole 1100. In this case, the flow of exhaust air passing through thegap 1090 becomes smooth, and venting efficiency can be increased. - When driving the
centrifugal air blower 1001, driving current is supplied to thestator 1021 of themotor 1011, and therotating portion 1030 of themotor 1011 and theimpeller 1012 rotate. When theimpeller 1012 rotates, gas above the upper-side casing 1133 is suctioned via themiddle hole 1130 of the upper-side casing 1133 and thesuction port 1513 of theimpeller 1012, passes between theupper shroud 1051 andlower shroud 1052, and is discharged to the outer side of theimpeller 1012 in the radial direction, as indicated by the solid arrows inFIG. 17 . - The gas discharged to the outer side of the
impeller 1012 in the radial direction strikes against thewall portion 1132 of the upper-side casing 1133 and changes direction downwards and toward the inner side in the radial direction, and advances downwards in the axial direction through theflow path 1010 formed between the outer peripheral face of the motor cover 1022 and inner peripheral face of thewall portion 1132, and thegap 1090 of thestator 1021, as illustratedFIG. 17 . This air flow then is discharged to the outside of thecentrifugal air blower 1001 via a vent at the lower end of theflow path 1010. - Next, a more detailed structure of the
stator 1021 will be described.FIG. 18 is a plan view of thestator 1021. Thestator 1021 according to the present modification has threecore pieces 1060, threeinsulators 1070, and threecoils 1080, as illustrated inFIG. 18 . This configuration enables the number of times of applying electricity to the winding wires per rotation to be reduced, so the motor is readily driven at high speeds. Note however, that in the present disclosure, the stator may be configured from a single core piece. - Note that the
insulators 1070 each have ateeth insulating portion 1071, an inner-side wall portion 1072, and an outer-side wall portion 1073. -
FIG. 19 is a plan view of acore pieces 1060. Themultiple core pieces 1060 are formed of a magnetic material, and disposed in the circumferential direction. Laminated steel plates, where magnetic steel plates that are magnetic material have been laminated in the axial direction, for example, are used for thecore pieces 1060. Eachcore piece 1060 has a core back (core back portion) 1061 and tooth (teeth portion) 1062, as illustrated inFIG. 19 . The core back 1061 extends in the outer side from thetooth 1062 in the circumferential direction. Note however, that the top view of the core back 1061 does not necessarily have to be an arc shape, as long as the entirety extends roughly in the circumferential direction. Thetooth 1062 protrudes from the middle of the core back 1061 in the circumferential direction toward the inner side in the radial direction. - The core back 1061 according to the present modification has a middle core back portion 1611 and a pair of connecting core back
portions 1612. The middle core back portion 1611 extends generally perpendicular to thetooth 1062 that extends in the radial direction. The middle core back portion 1611 also extends in both sides in the circumferential direction from the outer-side end of thetooth 1062 in the radial direction. The pair of connecting core backportions 1612 is positioned on both sides of the middle core back portion 1611 in the circumferential direction. Each connecting core backportion 1612 extends from the end of the middle core back portion 1611 in the circumferential direction while bending in a direction drawing closer to thetooth 1062. - This, one
tooth 1062 is provided to each of the threecore pieces 1060 in the present modification. Accordingly, the number ofteeth 1062 that thestator 1021 has is the minimal three for a three-phase synchronous motor. Reducing the number ofteeth 1062 enables the number of times of switching of the motor driving circuit per rotation to be reduced. Accordingly, themotor 1011 can be readily made to handle high speeds. - The three
core pieces 1060 are arrayed in the circumferential direction, as illustrated inFIG. 18 . The core backs 1061 of the threecore pieces 1060 are linked into a ring shape. Specifically, the edge portions of connecting core backportions 1612 ofadjacent core pieces 1060 are linked to each other. The joints between thecore pieces 1060 are fixed by welding, for example. - A fixing
hole 1063 that passes through in the axial direction is provided to the core back 1061 of eachcore piece 1060. That is to say, all of thecore pieces 1060 each have afixing hole 1063 in the present modification. According to this configuration, all of thecore pieces 1060 can be firmly fixed to the motor cover 1022 at the time of assembling thecentrifugal air blower 1001. The fixinghole 1063 is positioned on the outer side of the teeth portion 1602 in the radial direction. The vicinity of the core back 1061 in the circumferential direction is a position where the magnetic flux density is low when driving themotor 1011, and the role as a flux path is small. Providing thefixing hole 1063 at this position suppresses thefixing hole 1063 from narrowing the flux path. - The motor cover 1022 and
core pieces 1060 are fixed by a fixing member inserted into the fixing holes 1063. The motor cover 1022 has three first fixing portions 1223 and threesecond fixing portions 1224, as illustrated inFIG. 17 . The three first fixing portions 1223 each protrude to the inner side in the radial direction from theside plate portion 1222, above the above-described fixing holes 1063. Thesecond fixing portions 1224 protrude toward the inner side in the radial direction from theside plate portion 1222, below the above-described fixing holes 1063. The first fixing portions 1223 andsecond fixing portions 1224 are each provided with a screw hole extending in the axial direction. When manufacturing themotor 1011, ascrew 1043, which is a fixing member, is inserted into the screw hole of thesecond fixing portion 1224, the fixinghole 1063, and the first fixing portion 1223, at each of the three positions in the circumferential direction. Accordingly, thestator 1021 and motor cover 1022 are fixed. The motor cover 1022 andcore pieces 1060 can be firmly fixed by this configuration. - Note that the number of fixing positions of the
stator 1021 and motor cover 1022 does not necessarily have to be three. For example, an arrangement may be made where thefixing hole 1063 is provided to only one or twocore pieces 1060 of the threecore pieces 1060. Also, eachcore piece 1060 may be provided with two or more fixing holes. The method of fixing thestator 1021 and motor cover 1022 may be other than screwing. For example, the motor cover 1022 may be resin molded with thestator 1021 as an insertion part, thereby fixing thestator 1021 and motor cover 1022. - Now, the
coils 1080 are covered at the outer peripheral faces thereof by a covering portion (flow path forming member) 1081. The coveringportion 1081 is resin. Thecoils 1080 are wound on theteeth 1062 of thestator 1021, and the insulation of thecoils 1080 is ensured by thecoils 1080 being covered by the coveringportions 1081, and also vibration and noise can be reduced. - The
core pieces 1060 according to this modification has thin laminated steel plates laminated to reduce eddy current when rotating at high speeds, and the strength of the laminated steel plates can be ensured by thecoils 1080 being covered by the coveringportion 1081. - In addition, the
gap 1090 is formed between a coveringportion 1081 covering acoil 1080 and acovering portion 1081 covering anotheradjacent coil 1080 in the circumferential direction. Accordingly, the coveringportions 1081 configure thegap 1090. Thus, a wind flow path can be provided betweenadjacent teeth 1062, and thestator 1021 can be cooled by the air flowing through this flow path, while satisfying airflow properties of the centrifugal air blower. The coveringportions 1081 may have a configuration of connecting part of aninsulator 1070 orcoil 1080 at one side in the circumferential direction with aninsulator 1070 orcoil 1080 at the other side in the circumferential direction. In this case, the surface area of the coveringportions 1081 exposed to thegap 1090 can be increased, and the coils can be efficiently cooled via the coveringportions 1081. Note that an example is described in this modification regarding a centrifugal air blower where threecore pieces 1060 are employed, so space between adjacent teeth is readily secured and the stator is easier to cool as compared to six core pieces, for example. - Note that the distance in the circumferential direction between one covering
portion 1081 and anothercovering portion 1081 is longer at the upper side in the axial direction of theteeth 1062 than at the middle in the axial direction, and is longer at the lower side in the axial direction of theteeth 1062 than at the middle in the axial direction. This static pressure of thecentrifugal air blower 1001 can be raised even higher. - In addition, the covering
portions 1081 are formed by molding. - Although description has been made in the above modification regarding a centrifugal air blower used in a canister type vacuum cleaner, this is not restrictive.
FIG. 20 illustrates a centrifugal air blower 1001A used in a stick-type or handy-type vacuum cleaner. Thestator 1021 the same as in the above modification is used in the centrifugal air blower 1001A as well, and the same advantages can be obtained. Thus, the present disclosure is applicable to a centrifugal air blower that blows air through a smaller diameter flow path as well. - A structure equivalent to the above modification may also be applied to a motor used for usages other than a vacuum cleaner.
- Although description has been made regarding an example where the number of core pieces is three in the above modification, the number may be two, or may be four or more.
-
FIG. 21 is a perspective view of avacuum cleaner 100 having theblower 1 according to the present embodiment. Thevacuum cleaner 100 has the blower according to the above-described embodiment and modifications. Accordingly, theblower 1 installed in thevacuum cleaner 100 can be efficiently cooled, and venting efficiency can be improved. Note that the blower according to the embodiment and modifications is not restricted to thevacuum cleaner 100, and can be installed in other electric equipment as well. - Although an embodiment and modifications of the present disclosure have been described, the configurations and combinations thereof and so forth in the embodiment and modifications are exemplary, and additions, omissions, substitutions, and other changes may be made to the configurations, without departing from the essence of the present disclosure. The present disclosure is not restricted by embodiments.
- Features of the above-described preferred embodiments and the modifications thereof may be combined appropriately as long as no conflict arises.
- While preferred embodiments of the present disclosure have been described above, it is to be understood that variations and modifications will be apparent to those skilled in the art without departing from the scope and spirit of the present disclosure. The scope of the present disclosure, therefore, is to be determined solely by the following claims.
Claims (13)
1-12. (canceled)
13. A blower, comprising:
a rotor that has a shaft disposed following a central axis extending vertically;
a stator positioned at an outer side of the rotor in a radial direction;
a cylindrical housing extending in the axial direction, that accommodates the rotor and the stator; and
an impeller attached to the shaft, at an upper side from the stator;
wherein the stator includes
a ring-shaped core back portion,
a plurality of teeth portions extending from the core back portion toward an inner side in the radial direction,
an insulator that covers at least part of the teeth portions,
a coil wound on each of the teeth portions via the insulator, and
a flow path forming member of which at least part is positioned further at an inner side in the radial direction than the core back portion,
wherein the housing has a through hole that opens to the inner side,
wherein the flow path forming member connects part of the insulator or the coil at one side in the circumferential direction and part of the insulator or the coil at another side in the circumferential direction, and forms a flow path that passes further at an inner side in the radial direction than the core back portion,
and wherein the flow path connects to the through hole of the housing.
14. The blower according to claim 13 , wherein at least part of an inner side face of the core back portion in the radial direction is exposed to the flow path.
15. The blower according to claim 13 ,
wherein the flow path forming member has
an upper opening that opens to an upper side of the core back portion, and
a lower opening that opens to a lower side of the core back portion,
and wherein the flow path connects the upper opening and the lower opening.
16. The blower according to claim 13 ,
wherein the flow path forming member covers the coil.
17. The blower according to claim 15 ,
wherein the lower opening opens toward a lower side in the axial direction.
18. The blower according to claim 17 ,
wherein the upper opening opens toward an upper side in the axial direction.
19. The blower according to claim 17 ,
wherein the upper opening opens toward the outer side in the radial direction.
20. The blower according to claim 19 ,
wherein the flow path forming member has an inclined face that is positioned progressively further at a forward side in rotational direction of the impeller as to the radial direction, the further toward the inner side in the radial direction of the upper opening.
21. The blower according to claim 13 ,
wherein the flow path forming member is a hollow member positioned between the coils arrayed in the circumferential direction.
22. The blower according to claim 13 ,
wherein the flow path forming member has a tapered portion where a flow path cross-sectional area progressively increases from the upper side toward the lower side.
23. The blower according to claim 13 ,
wherein the flow path forming member has
a first tapered portion where the flow path cross-sectional area progressively decreases from the upper side toward the lower side, and
a second tapered portion, positioned at the lower side of the first tapered portion, where a flow path cross-sectional area progressively increases from the upper side toward the lower side.
24. A vacuum cleaner, comprising the blower according to claim 13 .
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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US15/576,338 US20180163747A1 (en) | 2015-05-25 | 2015-10-30 | Blower and vacuum cleaner |
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JP2015105924 | 2015-05-25 | ||
US201562168165P | 2015-05-29 | 2015-05-29 | |
US201562185854P | 2015-06-29 | 2015-06-29 | |
US15/576,338 US20180163747A1 (en) | 2015-05-25 | 2015-10-30 | Blower and vacuum cleaner |
PCT/JP2015/080702 WO2016189763A1 (en) | 2015-05-25 | 2015-10-30 | Blowing device and cleaner |
Publications (1)
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US20180163747A1 true US20180163747A1 (en) | 2018-06-14 |
Family
ID=57392654
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US15/576,338 Abandoned US20180163747A1 (en) | 2015-05-25 | 2015-10-30 | Blower and vacuum cleaner |
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EP (1) | EP3306105A4 (en) |
JP (1) | JPWO2016189763A1 (en) |
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WO (1) | WO2016189763A1 (en) |
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- 2015-10-30 CN CN201580080499.4A patent/CN107614891B/en not_active Expired - Fee Related
- 2015-10-30 EP EP15893395.2A patent/EP3306105A4/en not_active Withdrawn
- 2015-10-30 US US15/576,338 patent/US20180163747A1/en not_active Abandoned
- 2015-10-30 JP JP2017520203A patent/JPWO2016189763A1/en active Pending
- 2015-10-30 WO PCT/JP2015/080702 patent/WO2016189763A1/en active Application Filing
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Also Published As
Publication number | Publication date |
---|---|
EP3306105A1 (en) | 2018-04-11 |
EP3306105A4 (en) | 2019-02-27 |
JPWO2016189763A1 (en) | 2018-03-08 |
CN107614891B (en) | 2019-03-15 |
WO2016189763A1 (en) | 2016-12-01 |
CN107614891A (en) | 2018-01-19 |
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