US20180242799A1 - Blowing device, and vacuum cleaner - Google Patents
Blowing device, and vacuum cleaner Download PDFInfo
- Publication number
- US20180242799A1 US20180242799A1 US15/969,871 US201815969871A US2018242799A1 US 20180242799 A1 US20180242799 A1 US 20180242799A1 US 201815969871 A US201815969871 A US 201815969871A US 2018242799 A1 US2018242799 A1 US 2018242799A1
- Authority
- US
- United States
- Prior art keywords
- cylindrical portion
- motor cover
- motor
- impeller
- blowing device
- 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
Links
- 238000007664 blowing Methods 0.000 title claims abstract description 72
- 238000004891 communication Methods 0.000 claims abstract description 78
- 239000011347 resin Substances 0.000 claims description 3
- 229920005989 resin Polymers 0.000 claims description 3
- 238000001816 cooling Methods 0.000 description 4
- 230000008901 benefit Effects 0.000 description 2
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 238000009423 ventilation Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 238000005476 soldering Methods 0.000 description 1
Images
Classifications
-
- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
- A47L5/00—Structural features of suction cleaners
- A47L5/12—Structural features of suction cleaners with power-driven air-pumps or air-compressors, e.g. driven by motor vehicle engine vacuum
- A47L5/22—Structural features of suction cleaners with power-driven air-pumps or air-compressors, e.g. driven by motor vehicle engine vacuum with rotary fans
-
- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
- A47L9/00—Details or accessories of suction cleaners, e.g. mechanical means for controlling the suction or for effecting pulsating action; Storing devices specially adapted to suction cleaners or parts thereof; Carrying-vehicles specially adapted for suction cleaners
-
- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
- A47L9/00—Details or accessories of suction cleaners, e.g. mechanical means for controlling the suction or for effecting pulsating action; Storing devices specially adapted to suction cleaners or parts thereof; Carrying-vehicles specially adapted for suction cleaners
- A47L9/28—Installation of the electric equipment, e.g. adaptation or attachment to the suction cleaner; Controlling suction cleaners by electric means
- A47L9/2889—Safety or protection devices or systems, e.g. for prevention of motor over-heating or for protection of the user
-
- 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
-
- 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
- F04D25/0613—Units comprising pumps and their driving means the pump being electrically driven the electric motor being specially adapted for integration in the pump the electric motor being of the inside-out type, i.e. the rotor is arranged radially outside a central stator
-
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/40—Casings; Connections of working fluid
- F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
- F04D29/4206—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for elastic fluid pumps
-
- 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
Definitions
- the motor cover cylindrical portion 72 A includes cylindrical portion side wall portions 76 A that connect the outer surface 721 A of the motor cover cylindrical portion and the inner surface 722 A of the motor cover cylindrical portion to each other.
- the cylindrical portion side wall portions 76 A connect radial-direction outer end portions 761 A of the cylindrical portion side wall portions and radial-direction inner end portions 762 A of the cylindrical portion side wall portions to each other.
- the cylindrical portion side wall portions 76 A are side walls of the communication portions 75 A.
- the motor cover cylindrical portion 72 A includes other cylindrical portion side wall portions 76 A that oppose the cylindrical portion side wall portions 76 A described above with a gap in between in the circumferential direction.
- the other cylindrical portion side wall portions 76 A are side walls of the communication portions 75 A.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
- Electric Suction Cleaners (AREA)
Abstract
A blowing device according to an exemplary embodiment of the present disclosure includes a motor that includes a shaft disposed along a central axis extending in an up-down direction, an impeller fixed to the shaft, the impeller being disposed above the motor, an impeller cover that surrounds an upper side and an outer side in a radial direction of the impeller, the impeller cover including an intake port at a middle, a motor cover disposed on an outer side in a radial direction of the motor. The motor includes a rotor portion fixed to the shaft, the rotor portion including a magnet, a stator portion that opposes the magnet, and a bearing that rotatably supports the shaft with respect to the stator portion. The motor cover includes a tubular motor cover cylindrical portion that is open downwards. An inner surface of the motor cover cylindrical portion opposes the motor with a gap in between in the radial direction. The motor cover cylindrical portion includes a communication portion that communicates an inner space of the motor cover cylindrical portion and an outer space of the motor cover cylindrical portion to each other.
Description
- This application claims the benefit of priority to Japanese Patent Application No. 2015-219104 filed on Nov. 9, 2015, Japanese Patent Application No. 2016-086362 filed on Apr. 22, 2016, and is a Continuation Application of PCT Application No. PCT/JP2016/083019 filed on Nov. 8, 2016. The entire contents of each application are hereby incorporated herein by reference.
- The present disclosure is related to a blowing device and a vacuum cleaner.
- Hitherto, there is known an electric blower that is capable of cooling a drive semiconductor element. An electric blower distributes air that has been generated by an impeller and that has been guided by an air guide along a ventilation passage formed between an outer cylinder and a frame, and claims that a compact, efficient, and low-noise cooling mechanism can be obtained by attaching a drive semiconductor element to the outer cylinder.
- However, in the electric blower, the air that has flowed along the ventilation passage does not flow into an inside of the frame; accordingly, there is a problem in that the motor cannot be efficiently cooled.
- A blowing device according to an exemplary embodiment of the present disclosure includes a motor that includes a shaft disposed along a central axis extending in an up-down direction, an impeller fixed to the shaft, the impeller being disposed above the motor, an impeller cover that surrounds an upper side and an outer side in a radial direction of the impeller, the impeller cover including an intake port at a middle, a motor cover disposed on an outer side in a radial direction of the motor, the motor including a rotor portion fixed to the shaft, the rotor portion including a magnet, a stator portion that opposes the magnet, and a bearing that rotatably supports the shaft with respect to the stator portion, the motor cover including a tubular motor cover cylindrical portion that is open downwards, an inner surface of the motor cover cylindrical portion opposing the motor with a gap in between in the radial direction, and the motor cover cylindrical portion including a communication portion that communicates an inner space of the motor cover cylindrical portion and an outer space of the motor cover cylindrical portion to each other.
- 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 an upper perspective view of a blowing device according to a first embodiment. -
FIG. 2 is a longitudinal section of the blowing device according to the first embodiment. -
FIG. 3 is a bottom view of the blowing device according to the first embodiment. -
FIG. 4 is a lower perspective view of the blowing device according to the first embodiment. -
FIG. 5 is a longitudinal section of a blowing device according to a second embodiment. -
FIG. 6 is a bottom view of the blowing device according to the second embodiment. -
FIG. 7 is a perspective view of a vacuum cleaner. - Hereinafter, referring to the drawings, a blowing device according to exemplary embodiments of the present disclosure will be described. In the description hereinafter, the direction in which a central axis J extends is referred to as an axial direction. Furthermore, the upper side in the axial direction is merely referred to as an upper side and the lower side in the axial direction is merely referred to as a lower side. Note that the axial direction, an up-down direction, the upper side, and the lower side are terms that are used merely for description and do not limit the actual positional relationships and directions. Furthermore, unless otherwise stated, a direction parallel to the central axis J is merely referred to as the “axial direction”, a radial direction having the central axis J as the center is merely referred to as a “radial direction”, and a circumferential direction about the central axis J is merely referred to as a “circumferential direction”. Note that in the description hereinafter, for convenience sake, slanted lines in the cross sections and lines that illustrate partial structures may be omitted.
- Hereinafter, a blowing
device 1 according to an exemplary first embodiment of the present disclosure will be described.FIG. 1 is a perspective view of the blowingdevice 1 viewed from above. The blowingdevice 1 includes animpeller cover 60, ablower cover 74, and animpeller 50. -
FIG. 2 is a longitudinal section of the blowingdevice 1 of the first embodiment. The blowingdevice 1 includes amotor 10, theimpeller 50, theimpeller cover 60, and amotor cover 70. Themotor 10 includes ashaft 11 disposed along the vertically extending central axis J. Themotor 10 includes arotor portion 20, astator portion 30, andbearings 40. Thebearings 40 rotatably supports theshaft 11 with respect to thestator portion 30. - The
rotor portion 20 includes arotor holder 21 that is fixed to theshaft 11 and that has a lidded cylindrical shape having an opening on the upper side. In the present embodiment, therotor holder 21 is directly fixed to theshaft 11. However, therotor holder 21 may be fixed to theshaft 11 with another member interposed therebetween. - The
rotor holder 21 includes a rotor holdercylindrical portion 22 and a rotorholder bottom portion 23. The rotor holdercylindrical portion 22 is a tubular portion extending in the axial direction. Amagnet 24 is fixed to an inner circumferential surface of the rotor holdercylindrical portion 22. In other words, therotor portion 20 is fixed to theshaft 11 and includes themagnet 24. Themagnet 24 has a cylindrical shape. - The rotor
holder bottom portion 23 is disposed below the rotor holdercylindrical portion 22. More specifically, the rotorholder bottom portion 23 is a substantially plate-shaped portion that extends inwardly from a lower end of the rotor holdercylindrical portion 22. - The
stator portion 30 opposes themagnet 24. Thestator portion 30 includes astator core 31, andcoils 32 are each formed in thestator core 31 by wounding conducing wire with an insulator (not shown) interposed therebetween. In the present embodiment, themotor 10 is of a so-called outer rotor type. Accordingly, themagnet 24 is fixed to an inner circumferential surface of the rotor holdercylindrical portion 22. Thestator core 31 is disposed inside themagnet 24 with a gap therebetween in the radial direction. - The
stator portion 30 includes a bearinghousing 33, amounting plate 34, and acircuit board 36. The bearinghousing 33 is a tubular member extending in the axial direction. A portion of the bearinghousing 33 is fixed to a portion of a motor covertop plate portion 71 described later. Thebearings 40 are fixed to an inner surface of the bearinghousing 33. In the present embodiment, thebearings 40 are ball bearings. Note that thebearings 40 may be slide bearings or the like. - The
mounting plate 34 is disposed above therotor holder 21 and thestator core 31. Themounting plate 34 on the outer side with respect to the bearinghousing 33 extends in a direction orthogonal to theshaft 11. At least a portion of themounting plate 34 is fixed to the bearinghousing 33. Themounting plate 34 is formed of a metal member. As illustrated inFIG. 3 , themounting plate 34 includes mountingplate flange portions 35 that protrude from the outer edge thereof in the radial direction. In the present embodiment, the mountingplate flange portions 35 are formed at three portions in the circumferential direction. The mountingplate flange portions 35 and the motor covertop plate portion 71 described later are fixed to each other with screws. - Returning to
FIG. 2 , themotor 10 further includes thecircuit board 36 disposed below the mountingplate 34 and above therotor holder 21. Thecircuit board 36 on the outer side with respect to the bearinghousing 33 extends in a direction orthogonal to theshaft 11. In other words, an outer end of thecircuit board 36 in the radial direction is disposed radially outside an outer end of the bearinghousing 33 in the radial direction. An inner end of thecircuit board 36 in the radial direction is fixed to the bearinghousing 33. Lead wire drawn out from eachcoil 32 is electrically connected to thecircuit board 36. The electric connection between thecircuit board 36 and each lead wire is achieved by soldering, for example. - The
impeller 50 is fixed to theshaft 11 and is disposed above themotor 10. With the rotation of themotor 10 fixed to theshaft 11, theimpeller 50 rotates about the central axis J together with theshaft 11. In the present embodiment, in plan view from the upper side in the axial direction, theimpeller 50 rotates in the counterclockwise direction. In other words, in plan view from the upper side in the axial direction, a rotation direction R of the impeller is counterclockwise. - The
impeller 50 includes a plurality of movingblades 51, amain plate 52, ashroud 53, and abalance correcting portion 54. Thebalance correcting portion 54 is formed on theshroud 53. Describing in more detail, thebalance correcting portion 54 is disposed on an upper surface of theshroud 53 in an external area in the radial direction. - The
balance correcting portion 54 includes afirst protrusion 541 and asecond protrusion 542. Thefirst protrusion 541 is an annular portion that protrudes upwards from the upper surface of theshroud 53. Thesecond protrusion 542 is an annular portion that protrudes upwards from the upper surface of theshroud 53. Thesecond protrusion 542 is disposed on an outer side of thefirst protrusion 541 in the radial direction. In the present embodiment, thesecond protrusion 542 is disposed on an outer edge of theshroud 53. With the above, a space is formed between thefirst protrusion 541 and thesecond protrusion 542 in the radial direction. - When the balance of the assembly of the
motor 10 and theimpeller 50 is corrected, aweight 543 is put in in a space between thefirst protrusion 541 and thesecond protrusion 542 in the radial direction; accordingly, the rotational balance of the assembly of theimpeller 50 and therotor portion 20 is corrected with respect to the central axis J. Note that in the present embodiment, since thebalance correcting portion 54 is formed on the upper surface of theshroud 53, the balance can be corrected easily even after the assembly has been formed. In other words, work efficiency when correcting the balance of the assembly is improved. Furthermore, since an upper end of thefirst protrusion 541 is disposed above an upper end of thesecond protrusion 542, air can be suppressed from flowing inside thefirst protrusion 541 in the radial direction when theimpeller 50 is rotated. In other words, the labyrinth characteristics between the upper surface of theshroud 53 and theimpeller cover 60 is improved. - The plurality of moving
blades 51 are disposed in the circumferential direction. In the present embodiment, the plurality of movingblades 51 include first movingblades 511 and second movingblades 512. Inner ends of the first movingblades 511 in the radial direction are disposed radially inside inner ends of the second movingblades 512 in the radial direction. In other words, the plurality of movingblades 51 are constituted by two types of moving blades that have different lengths in the radial direction. In the present embodiment, the movingblades 51 are formed by disposing the first movingblades 511 and the second movingblades 512 in the circumferential direction. However, the plurality of movingblades 51 may all have the same shape or may have three types of different shapes. - The
main plate 52 is molded as a member that is integral with the plurality of movingblades 51. Themain plate 52 is disposed below the movingblades 51. Lower portions of the plurality of movingblades 51 are connected to themain plate 52. A vertically penetrating throughhole 521 is formed on an inner side of themain plate 52. Theimpeller 50 is fixed to theshaft 11 through animpeller hub 501 fixed to the throughhole 521. However, theimpeller 50 and theshaft 11 may be fixed to each other through another fixing method. In the present embodiment, an upper surface of themain plate 52 forms a curved surface that is the highest at the middle portion thereof and that, as the curved surface extends towards the outer side, spreads downwards in a smooth manner. With the above, since the air flowing from the upper side is guided along the upper surface of themain plate 52 towards the outer side in the radial direction, air blowing efficiency of theimpeller 50 is improved. Note that themain plate 52 may have another shape and, for example, may have a flat plate shape that extends in the direction orthogonal to theshaft 11. - An inner side of an underside of the
main plate 52 is disposed above an underside of an outer edge of themain plate 52. The underside of themain plate 52 has a curved surface that extends towards the lower side in a smooth manner as the curved surface extends from the inside to the outer side. Themain plate 52 includes, in the underside thereof, a plurality ofmain plate ribs 522 disposed in the circumferential direction. Positions of the lower ends of themain plate ribs 522 in the axial direction are substantially the same as the position of the underside of the outer edge of themain plate 52 in the axial direction. However, the lower ends of themain plate ribs 522 may be positioned above the outer edge of themain plate 52. Themain plate ribs 522 are disposed more on the rear side in the rotation direction R of the impeller as themain plate ribs 522 extend from the inside towards the outer side. With the above, when theimpeller 50 rotates, themain plate ribs 522 rotates as well in an integral manner; accordingly, the air between themain plate 52 and an upper surface of the motor covertop plate portion 71 described later can be discharged towards the outer side in the radial direction. Accordingly, a decrease in the air blowing efficiency caused by the air discharged by the rotation of theimpeller 50 towards the outer side in the radial direction flowing into the gap between themain plate 52 and the motor covertop plate portion 71 in the axial direction can be reduced. Furthermore, the rigidity of themain plate 52 is increased owing to the formation of themain plate ribs 522. - The
shroud 53 is disposed above the movingblades 51. Theshroud 53 includes a throughhole 531 that penetrates thereof in the axial direction. Upper portions of the plurality of movingblades 51 are connected to theshroud 53. In the middle portion of theshroud 53, the throughhole 531 that penetrates thereof in the axial direction is formed. With the above, the air that has been taken in from above theimpeller 50 passes through the throughhole 531 of theshroud 53 and is taken in into theimpeller 50. Theshroud 53 curves towards the lower side in a smooth manner as theshroud 53 extends from an inner end to the outer side. Accordingly, the air taken in into theimpeller 50 is guided downwards and outwards in a smooth manner along the underside of theshroud 53 and the upper surface of themain plate 52. - The
impeller cover 60 surrounds an upper side and an outer side in the radial direction of theimpeller 50, and includes anintake port 61 at the middle thereof. With the above, the air above theblowing device 1 can be taken in into theblowing device 1 through theintake port 61. The air taken in through theintake port 61 is taken in inside theimpeller 50 through the throughhole 531 formed in theshroud 53. - The
impeller cover 60 includes an impeller coverupper end portion 62, an impellercover inclination portion 63, an impellercover projecting portion 64, an impeller covercylindrical portion 65, and an impellercover guide portion 66. - The impeller cover
upper end portion 62 includes, at the middle thereof, theintake port 61. The impellercover inclination portion 63 extends towards the outer side and the lower side in a smooth manner from an outer side of the impeller coverupper end portion 62. An underside of the impellercover inclination portion 63 opposes the upper surface of theshroud 53 with a gap in between. The gap formed between the underside of the impellercover inclination portion 63 and the upper surface of theshroud 53 is substantially uniform. With the above, a decrease in the air blowing efficiency of theblowing device 1 due to the air flowing in between the impellercover inclination portion 63 and theupper shroud 53 can be suppressed. - The impeller
cover projecting portion 64 projects upwards from an outer side of the impellercover inclination portion 63. The impellercover projecting portion 64 is a portion that projects upwards from the outer side of the impellercover inclination portion 63. The impellercover projecting portion 64 is formed in an annular manner about the central axis J. An underside of the impellercover projecting portion 64 is disposed above an outer side of the underside of the impellercover inclination portion 63. In other words, in the area where the impellercover projecting portion 64 is disposed, an underside of theimpeller cover 60 is recessed towards the upper side. Thebalance correcting portion 54 is disposed in a space formed below the impellercover projecting portion 64. - The impeller cover
cylindrical portion 65 is a tubular portion that extends downwards from an outer side of the impellercover projecting portion 64. On an outer side of an outer end of theimpeller 50, the impellercover guide portion 66 extends downwards and outwards in the radial direction so as to form a smooth curved surface forming a convex from a lower end portion of the impeller covercylindrical portion 65 towards the outer side of theimpeller cover 60. With the above, the air exhausted from theimpeller 50 is guided outwards in the radial direction and downwards in a smooth manner. - The
motor cover 70 is disposed on the outer side of themotor 10 in the radial direction. Themotor cover 70 includes the motor covertop plate portion 71 and a motor covercylindrical portion 72. The motor covertop plate portion 71 is disposed above themotor 10 and is a plate-shaped portion that extends in a direction substantially orthogonal to the central axis J. The motor covercylindrical portion 72 is a tubular portion that extends downwards from an outer side of the motor covertop plate portion 71 in the radial direction. The motor covercylindrical portion 72 is open downwards. In other words, themotor cover 70 includes a tubular motor covercylindrical portion 72 that open downwards. - The
blower cover 74 is disposed on the outer side of theouter surface 721 of the motor cover cylindrical portion in the radial direction. Theblower cover 74 is connected to the impellercover guide portion 66 and is a tubular portion that extends downwards. Theouter surface 721 of the motor cover cylindrical portion and an inner surface of theblower cover 74 oppose each other with a gap in between in the radial direction. With the above, aflow passage 80 is formed between theouter surface 721 of the impeller cover cylindrical portion and the inner surface of theblower cover 74. Theouter surface 721 of the motor cover cylindrical portion and a lower end of theblower cover 74 constitute anexhaust port 81 of theflow passage 80. Accordingly, the air discharged to the outside of theimpeller 50 in the radial direction is smoothly guided along an inner surface of the impellercover guide portion 66 towards the outer side in the radial direction and towards the lower side in the axial direction, passes theflow passage 80, and is discharged towards the lower side from theexhaust port 81. - The
motor cover 70 includes a plurality ofstator blades 73 disposed on an outer surface of the motor covercylindrical portion 72 in the circumferential direction. Lower portions of thestator blades 73 in the axial direction are disposed on the front side in the rotation direction R of the impeller with respect to the upper portions of thestator blades 73 in the axial direction. Describing in more detail, the upper portions of thestator blades 73 in the axial direction are positioned on the rear side in the rotation direction R of the impeller, and are curved downwards in a smooth manner from upper ends towards the front side in the rotation direction R of the impeller and towards the lower side, and extend downwards towards the lower portions of thestator blades 73 in the axial direction. With the above, the air flowing inside theflow passage 80 is guided towards theexhaust port 81 in a smooth manner. In other words, since the air discharged by the rotation of theimpeller 50 has a swirling component in the circumferential direction oriented towards the front side in the rotation direction R of the impeller, the air having a swirling component is guided in a smooth manner towards the lower side with thestator blades 73. With the above, the air blowing efficiency of the air flowing inside theflow passage 80 is improved. - In the present embodiment, the
motor cover 70, thestator blades 73, and theblower cover 74 are formed by an integral resin member. Outer sides of thestator blades 73 in the radial direction are connected to the inner surface of theblower cover 74. In other words, themotor cover 70 includes thetubular blower cover 74 that extends downwards from a lower end portion of theimpeller cover 60 and that is connected to the outer ends of thestator blades 73 in the radial direction. Due to the above, themotor cover 70, thestator blades 73, and theblower cover 74 can be molded inexpensively as an integral member with a pair of molds that slide in the up-down direction. Furthermore, since the motor covercylindrical portion 72 and theblower cover 74 can be formed as an integral member, compared with a case in which the covercylindrical portion 72 and theblower cover 74 are different members, concentricity between an outer surface of the motor covercylindrical portion 72 and theblower cover 74 is improved. Accordingly, since the width of theflow passage 80 in the radial direction becomes uniform in the circumferential direction, generation of pressure differences in the circumferential direction in the air flowing inside theflow passage 80 can be suppressed; accordingly, the air blowing efficiency of theblowing device 1 is improved. - The
motor 10 is disposed on the inner side of the motor covercylindrical portion 72 in the radial direction. Aninner surface 722 of the motor cover cylindrical portion and themotor 10 oppose each other with a gap in between in the radial direction. With the above, either an inner rotor type motor or an outer rotor type motor can be disposed on the inner side of the motor covercylindrical portion 72 in the radial direction. In the present embodiment, themotor 10 of the outer rotor type is disposed on the inner side of the motor covercylindrical portion 72 in the radial direction. Since themotor 10 includes therotor holder 21 that rotates, and there is a gap between therotor holder 21 and theinner surface 722 of the motor cover cylindrical portion in the radial direction, the outerrotor type motor 10 can be used as a drive unit of theblowing device 1. - The motor cover
cylindrical portion 72 includescommunication portions 75 that communicate aninner space 83 of the motor cover cylindrical portion and anouter space 82 of the motor cover cylindrical portion to each other. Furthermore, since the motor covercylindrical portion 72 is open downwards, a portion of the air that has flowed downwards in theflow passage 80, swirls towards the inside in the radial direction after being discharged from theexhaust port 81, enters theinner space 83 of the motor cover cylindrical portion that fills the inner side of the motor covercylindrical portion 72 in the radial direction, passes thecommunication portions 75 from theinner space 83 of the motor cover cylindrical portion, and is discharged to theouter space 82 of the motor cover cylindrical portion. Since theouter space 82 of the motor cover cylindrical portion is theflow passage 80, the air that has been discharged to theflow passage 80 through thecommunication portions 75 merges with the flow of air flowing downwards inside theflow passage 80, flows downwards inside theflow passage 80 once again, and is discharged through theexhaust port 81. - The
motor 10 is disposed in theinner space 83 of the motor cover cylindrical portion. Accordingly, due to the generation of heat by thecoils 32, a circuit element mounted on thecircuit board 36, and the like, a temperature of theinner space 83 of the motor cover cylindrical portion becomes higher than a temperature of theouter space 82 of the motor cover cylindrical portion. However, in theblowing device 1 of the present embodiment, since a portion of the air that flows in theflow passage 80 with the mechanism described above circulates through theinner space 83 of the motor cover cylindrical portion and theouter space 82 of the motor cover cylindrical portion through thecommunication portions 75, a portion of the heat generated in theinner space 83 of the motor cover cylindrical portion can be efficiently discharged to theouter space 82 of the motor cover cylindrical portion. With the above, the temperature of theinner space 83 of the motor cover cylindrical portion is decreased, and themotor 10 and the circuit element mounted on thecircuit board 36 are cooled. Furthermore, the bearinghousing 33 and the mountingplate 34 are members made of metal. With the above, since the bearinghousing 33 and the mountingplate 34 exceed in thermal conductivity, the heat accumulated in the bearinghousing 33 and the mountingplate 34 is efficiently cooled by the air flowing in theinner space 83 of the motor cover cylindrical portion. Accordingly, the cooling characteristics of themotor 10 are improved. - Note that in the present embodiment, the
outer surface 721 of the motor cover cylindrical portion around the lower end of the motor covercylindrical portion 72, in other words, around theexhaust port 81, is disposed on the inner side in the radial direction with respect to an upper side of the motor covercylindrical portion 72, in other words, theouter surface 721 of the motor cover cylindrical portion in the area around where thestator blades 73 are disposed. Describing in more detail, theouter surface 721 of the motor cover cylindrical portion includes a motor coverlower area 723 that curves inwardly in the radial direction in a smooth manner as it extends towards the lower side. With the above, since a portion of the air flowing downwards through theflow passage 80 and that is discharged from theexhaust port 81 is smoothly guided towards theinner space 83 of the motor cover cylindrical portion so as to confirm the shape around the lower end of theouter surface 721 of the motor cover cylindrical portion, the flow of air circulating theinner space 83 of the motor cover cylindrical portion becomes smooth. Accordingly, themotor 10 disposed in theinner space 83 of the motor cover cylindrical portion can be cooled efficiently. Note that the motor coverlower area 723 may be a flat surface that is oriented inwards in the radial direction as the motor coverlower area 723 extends downwards. - Furthermore, in the present embodiment, the inner surface of the
blower cover 74 is configured so as to be parallel to the axial direction. Accordingly, the width of the flow passage formed between theouter surface 721 of the motor cover cylindrical portion and the inner surface of theblower cover 74 in the radial direction is narrow in the area where thestator blades 73 are disposed and is the widest in the area where theexhaust port 81 is formed. With the above, in the area where thestator blades 73 are disposed, the static pressure of the air flowing in theflow passage 80 becomes high and, in the area where theexhaust port 81 is formed, the static pressure of the air becomes gradually smaller; accordingly, air resistance around theexhaust port 81 can be reduced. Accordingly, a generation of turbulent flow in theflow passage 80 can be reduced, and the air blowing efficiency of theblowing device 1 can be improved. - A specific configuration of the
communication portions 75 will be described next.FIG. 3 is a bottom view of theblowing device 1 of the first embodiment, andFIG. 4 is a perspective view of theblowing device 1 of the first embodiment viewed from below. As illustrated inFIGS. 3 and 4 , in the present embodiment, the motor covercylindrical portion 72 includes cylindrical portionside wall portions 76 that connect theouter surface 721 of the motor cover cylindrical portion and theinner surface 722 of the motor cover cylindrical portion to each other. The cylindrical portionside wall portions 76 connect radial-directionouter end portions 761 of the cylindrical portion side wall portions and radial-directioninner end portions 762 of the cylindrical portion side wall portions to each other. The cylindrical portionside wall portions 76 are side walls of thecommunication portions 75. The motor covercylindrical portion 72 includes other cylindrical portionside wall portions 76 that oppose the cylindrical portionside wall portions 76 described above with a gap in between in the circumferential direction. The other cylindrical portionside wall portions 76 are side walls of thecommunication portions 75. In other words, the motor covercylindrical portion 72 includes cylindrical portionside wall portions 76 that connect theouter surface 721 of the motor cover cylindrical portion and theinner surface 722 of the motor cover cylindrical portion to each other and that constitute the side walls of thecommunication portions 75. The width of eachcommunication portion 75 in the circumferential direction is the same as a width in the circumferential direction between two cylindrical portionside wall portions 76 that oppose each other with a gap in between in the circumferential direction. - The
communication portions 75 are formed so as to be, with respect to the radial direction, inclined in the circumferential direction. In other words, the cylindrical portionside wall portions 76 are, with respect to the radial direction, inclined in the circumferential direction. In the present embodiment, the radial-directionouter end portions 761 of the cylindrical portion side wall portions are disposed on the front side in the rotation direction R of the impeller with respect to the radial-directioninner end portions 762 of the cylindrical portion side wall portions. With the above, the air discharged to theouter space 82 of the motor cover cylindrical portion through thecommunication portions 75 includes swirling components in the circumferential direction and in the rotation direction R of the impeller. Accordingly, the air discharged through thecommunication portions 75 to theouter space 82 of the motor cover cylindrical portion flows in theflow passage 80 and can smoothly merge with the air including the swirling component in the rotation direction R of the impeller. Accordingly, the air blowing efficiency inside theflow passage 80 is improved. Note that sinceFIG. 3 is a bottom view of theblowing device 1, the rotation direction R of the impeller is clockwise. - The cylindrical portion
side wall portions 76 are smooth curved surfaces that protrude towards the rear side in the rotation direction R of the impeller and connect the radial-directionouter end portions 761 of the cylindrical portion side wall portions and the radial-directioninner end portions 762 of the cylindrical portion side wall portions to each other. With the above, the air discharged to theouter space 82 of the motor cover cylindrical portion through thecommunication portions 75 is guided so as to have swirling components that are oriented towards the front side in the rotation direction R of the impeller in a smooth manner along the smooth curved surfaces that are protruded towards the rear side in the rotation direction R of the impeller. Accordingly, since merging with the air flowing in theflow passage 80 can be performed in a further smooth manner, the air blowing efficiency inside theflow passage 80 is improved. Note that the shapes of the radial-directionouter end portions 761 of the cylindrical portion side wall portions and the radial-directioninner end portions 762 of the cylindrical portion side wall portions may be chamfered surfaces or rounded shapes. With the above, a decrease in the air blowing efficiency due to generation of air vortexes around the radial-directionouter end portions 761 of the cylindrical portion side wall portions and the radial-directioninner end portions 762 of the cylindrical portion side wall portions can be reduced. - The motor cover
cylindrical portion 72 includes cylindrical portionupper wall portions 77 that connect theouter surface 721 of the motor cover cylindrical portion and theinner surface 722 of the motor cover cylindrical portion to each other. The cylindrical portionupper wall portions 77 are side walls of thecommunication portions 75. In other words, the motor covercylindrical portion 72 includes cylindrical portionupper wall portions 77 that connect theouter surface 721 of the motor cover cylindrical portion and theinner surface 722 of the motor cover cylindrical portion to each other and that constitute the side walls of thecommunication portions 75. Thecommunication portions 75 are open downwards in the axial direction. In other words, thecommunication portions 75 are recesses that are recessed towards the upper side from the lower end of the motor covercylindrical portion 72. With the above, themotor cover 70 including thecommunication portions 75 can be formed by molds that slide in the up-down direction. Accordingly, themotor cover 70 can be formed inexpensively and mass-productiveness increases as well. - At least a portion of each
communication portion 75 and at least a portion of theblower cover 74 oppose each other in the radial direction. With the above, the air discharged through thecommunication portions 75 to theouter space 82 of the motor cover cylindrical portion flows downwards along theflow passage 80 formed between theouter surface 721 of the motor cover cylindrical portion and the inner surface of theblower cover 74. In other words, by having theblower cover 74 be disposed on the outer sides of thecommunication portions 75 in the radial direction, the wind discharged to the outer side in the radial direction through thecommunication portions 75 is guided to flow downwards inside theflow passage 80 without flowing outside of theflow passage 80 in the radial direction; accordingly, the air blowing efficiency is improved. - Radial-direction outer end portions of the cylindrical portion
upper wall portions 77 are disposed below the lower ends of thestator blades 73 in the axial direction. In other words, thecommunication portions 75 are formed in areas in theflow passage 80 where thestator blades 73 are not disposed. Accordingly, compared with a case in which thecommunication portions 75 are formed in areas where the cross sections of theflow passage 80 are small due to the disposition of thestator blades 73, since the air that has passed through thecommunication portions 75 merges in theflow passage 80 where the areas of the cross sections of theflow passage 80 are large, the pressure of the air flowing inside theflow passage 80 can be suppressed from becoming excessively high and a decrease in the air blowing efficiency inside theflow passage 80 can be suppressed. Furthermore, since thecommunication portions 75 are formed below the lower ends of thestator blades 73 in the axial direction, the air that has passed thecommunication portions 75 merges with the air inside theflow passage 80 that has been regulated downwards in the axial direction with thestator blades 73; accordingly, generation of turbulent flows inside theflow passage 80 can be reduced. - The
communication portions 75 are disposed in plural numbers in the circumferential direction. With the above, since the air passes the plurality ofcommunication portions 75 and circulates through theinner space 83 of the motor cover cylindrical portion and theouter space 82 of the motor cover cylindrical portion, the heat of theinner space 83 of the motor cover cylindrical portion can be released in a further efficient manner. Furthermore, in the present embodiment, thecommunication portions 75 are disposed at equal intervals in the circumferential direction. With the above, the flow of air passing thecommunication portions 75 can be made uniform to the extent possible in the circumferential direction. Accordingly, since the flow of the air inside theflow passage 80 in the circumferential direction can be made uniform, the air blowing efficiency is improved. - The plurality of
communication portions 75 may be disposed unevenly in the circumferential direction. In other words, each of the intervals betweencertain communication portions 75 andother communication portions 75 in the circumferential direction do not have to be the same. With the above, since the flow of the air discharged to theouter space 82 of the motor cover cylindrical portion through thecommunication portions 75 becomes uneven inside theflow passage 80 in the circumferential direction, the sonic wave generated inside theflow passage 80 does not easily become a standing wave that has a specific frequency; accordingly, generation of a large noise can be reduced. - The number of
communication portions 75, the number of movingblades 51, and the number ofstator blades 73 are, desirably, relative primes. For example, the configuration may be such that the number ofcommunication portions 75 is 11, the number of movingblades 51 is 10, and the number ofstator blades 73 is 27. With the above, when theimpeller 50 rotates, resonance of the noises generated by thecommunication portions 75, the movingblades 51, and thestator blades 73 can be reduced and generation of noise can be reduced. Note that the number ofcommunication portions 75, the number of movingblades 51, and the number ofstator blades 73 may be relative primes of other combinations. In such a case, desirably, the number ofstator blades 73 is the largest. With the above, since the flow of air inside theflow passage 80 can be regulated with a number ofstator blades 73, the air blowing efficiency is improved. Furthermore, desirably, the number of movingblades 51 is half or less than half of the number of thestator blades 73. With the above, since the gap between a movingblade 51 and the adjacent movingblade 51 can be widened, the flow of air is facilitated. Furthermore, desirably, the number ofcommunication portions 75 is also half or less than half of the number ofstator blades 73. With the above, since the cross sections of thecommunication portions 75 can be increased, the air blowing efficiency of the air flowing through thecommunication portions 75 is improved. - A
blowing device 1A according to a second embodiment will be described next. Note that in the description hereinafter, description of components that overlap those of theblowing device 1 according to the first embodiment will be omitted. Furthermore, portions and members that have the same configuration as those of the first embodiment will be given reference numerals that are the same as those of the first embodiment. -
FIG. 5 is a longitudinal section of theblowing device 1A according to the second embodiment, andFIG. 6 is a bottom view of theblowing device 1A according to the second embodiment. As illustrated inFIG. 5 , in theblowing device 1A, a motor covercylindrical portion 72A includescommunication portions 75A that communicate aninner space 83A of the motor cover cylindrical portion and anouter space 82A of the motor cover cylindrical portion to each other. Thecommunication portions 75A are through holes that penetrate the motor covercylindrical portion 72A in the axial direction. In other words, in thecommunication portions 75A, different from thecommunication portions 75 of theblowing device 1 according to the first embodiment, thecommunication portions 75A are not cutaways open downwards but are through holes that penetrate the motor covercylindrical portion 72A in the radial direction. With the above, compared with a case in which cutaway-shapedcommunication portions 75 are formed, the rigidity of the motor covercylindrical portion 72A can be improved. Furthermore, by forming thecommunication portions 75A, the heat generated in theinner space 83A of the motor cover cylindrical portion can be efficiently discharged to theouter space 82A of the motor cover cylindrical portion. The mechanism of discharging the heat generated in theinner space 83A of the motor cover cylindrical portion to theouter space 82A of the motor cover cylindrical portion is similar to that of theblowing device 1 according to the first embodiment. - In the
blowing device 1A, the motor covercylindrical portion 72A is constituted by a first motor covercylindrical portion 724A that extends downwards from an outer side of the motor covertop plate portion 71A in the radial direction, and an annular second motor covercylindrical portion 725A that extends downwards from a lower end portion of the first motor covercylindrical portion 724A. In other words, the second motor covercylindrical portion 725A is a member that is separate from amotor cover 70A, and is an annular member that is disposed substantially coaxially with the first motor covercylindrical portion 724A. - The
motor cover 70A includes a plurality ofstator blades 73A disposed on anouter surface 721A of the motor cover cylindrical portion in the circumferential direction. The plurality ofstator blades 73A are formed on an outer surface of the first motor covercylindrical portion 724A. The first motor covercylindrical portion 724A, the plurality ofstator blades 73A, and ablower cover 74A are an integral resin member. Since the first motor covercylindrical portion 724A includes the motor covertop plate portion 71A, the rigidity thereof is higher than that of the second motor covercylindrical portion 725A. Accordingly, by being configured as a portion integral with the first motor covercylindrical portion 724A, the plurality ofstator blades 73A can, compared with being configured in the second motor covercylindrical portion 725A, improve the fixing strength. In other words, by forming thestator blades 73A on the outer surface of the first motor covercylindrical portion 724A, vibrations of thestator blades 73A can be reduced when the air is flowing inside aflow passage 80A. - The motor cover
cylindrical portion 72A includes cylindrical portionupper wall portions 77A that connect theouter surface 721A of the motor cover cylindrical portion and aninner surface 722A of the motor cover cylindrical portion to each other, and that constitute upper side walls of thecommunication portions 75A in the axial direction. In the present embodiment, the cylindrical portionupper wall portions 77A are constituted by portions of the underside of the first motor covercylindrical portion 724A. Radial-direction outer end portions of the cylindrical portionupper wall portions 77A are disposed below radial-direction inner end portions of the cylindrical portionupper wall portions 77A in the axial direction. With the above, the air discharged from theinner space 83A of the motor cover cylindrical portion to theouter space 82A of the motor cover cylindrical portion through thecommunication portions 75A includes a velocity component oriented downwards in the axial direction. Accordingly, since the air flowing in the flow passage through thecommunication portions 75A can smoothly merge with the air flowing downwards inside theflow passage 80A, the air blowing efficiency inside theflow passage 80A is improved. - Furthermore, in the present embodiment, the cylindrical portion
upper wall portions 77A are smooth curved surfaces that connect the radial-direction outer end portions of the cylindrical portionupper wall portions 77A and the radial-direction inner end portions of the cylindrical portionupper wall portions 77A to each other and that protrude towards the upper side in the axial direction. With the above, since the air that passes through thecommunication portions 75A and that is discharged to theouter space 82A of the motor cover cylindrical portion is guided in a smooth manner along the cylindrical portionupper wall portions 77A towards the outer side in the radial direction and towards the lower side in the axial direction, the air can be merged in a more efficient manner with the air flowing downwards inside theflow passage 80A; accordingly, the air blowing efficiency inside theflow passage 80A is improved. - The radial-direction outer end portions of the cylindrical portion
upper wall portions 77A are disposed above lower ends of thestator blades 73A in the axial direction. With the above, thecommunication portions 75A can be disposed on the upper side in the axial direction to the extent possible. When a portion of the air that has been discharged towards the outer side in the radial direction with the rotation of animpeller 50A, that has passed through theflow passage 80A, and that has been discharged downwards from anexhaust port 81A circulates theinner space 83A of the motor cover cylindrical portion, passes through thecommunication portions 75A, and merges again in theflow passage 80A, by disposing, to the extent possible, thecommunication portions 75A on the upper side in the axial direction, the distance in which the circulating air passes theinner space 83A of the motor cover cylindrical portion can be made longer; accordingly, the heat generated in theinner space 83A of the motor cover cylindrical portion can be discharged more efficiently to theouter space 82A of the motor cover cylindrical portion. - Particularly, in the present embodiment, since a
circuit board 36A is disposed on the upper side of theinner space 83A of the motor cover cylindrical portion, by having the air that circulates in theinner space 83A of the motor cover cylindrical portion reach, to the extent possible, the upper side in the axial direction and flow to theouter space 82A of the motor cover cylindrical portion, the heat generated from the circuit element disposed on thecircuit board 36A can be efficiently discharged. - Furthermore, in the present embodiment, the
communication portions 75A are not cutaways that are open downwards but are through holes constituted by the first motor covercylindrical portion 724A and the second motor covercylindrical portion 725A. Accordingly, compared with a case in which thecommunication portions 75 are formed to the upper portion of theinner space 83 of the motor cover cylindrical portion with recesses that are greatly recessed upwards in the axial direction, the rigidity of the motor covercylindrical portion 72A can be improved; accordingly, vibration of the motor covercylindrical portion 72A caused by the air flowing inside theflow passage 80A can be reduced. - The motor cover
cylindrical portion 72A includes cylindrical portionlower wall portions 78A that connect theouter surface 721A of the motor cover cylindrical portion and aninner surface 722A of the motor cover cylindrical portion to each other, and that constitute lower side walls of thecommunication portions 75A in the axial direction. In the present embodiment, the cylindrical portionlower wall portions 78A are constituted by portions of the upper surface of the second motor covercylindrical portion 725A. Radial-direction outer end portions of the cylindrical portionlower wall portions 78A are disposed below radial-direction inner end portions of the cylindrical portionlower wall portions 78A in the axial direction. With the above, the air discharged from theinner space 83A of the motor cover cylindrical portion to theouter space 82A of the motor cover cylindrical portion through thecommunication portions 75A includes a velocity component oriented downwards in the axial direction. Accordingly, since the air flowing in theflow passage 80A through thecommunication portions 75A can smoothly merge with the air flowing downwards inside the flow passage, the air blowing efficiency inside theflow passage 80A is improved. - The motor cover
cylindrical portion 72A includes cylindrical portionside wall portions 76A that connect theouter surface 721A of the motor cover cylindrical portion and theinner surface 722A of the motor cover cylindrical portion to each other. The cylindrical portionside wall portions 76A connect radial-directionouter end portions 761A of the cylindrical portion side wall portions and radial-directioninner end portions 762A of the cylindrical portion side wall portions to each other. The cylindrical portionside wall portions 76A are side walls of thecommunication portions 75A. The motor covercylindrical portion 72A includes other cylindrical portionside wall portions 76A that oppose the cylindrical portionside wall portions 76A described above with a gap in between in the circumferential direction. The other cylindrical portionside wall portions 76A are side walls of thecommunication portions 75A. In other words, the motor covercylindrical portion 72A includes cylindrical portionside wall portions 76A that connect theouter surface 721A of the motor cover cylindrical portion and theinner surface 722A of the motor cover cylindrical portion to each other and that constitute the side walls of thecommunication portions 75A. The width of eachcommunication portion 75A in the circumferential direction is the same as a width in the circumferential direction between two cylindrical portionside wall portions 76A that oppose each other with a gap in between in the circumferential direction. In the present embodiment, the cylindrical portionside wall portions 76A are constituted by portions of the second motor covercylindrical portion 725A. However, the cylindrical portionside wall portions 76A may be constituted by portions of the first motor covercylindrical portion 724A. - The radial-direction
outer end portions 761A of the cylindrical portion side wall portions are disposed on the front side in the rotation direction R of the impeller with respect to the radial-directioninner end portions 762A of the cylindrical portion side wall portions. Describing in more detail, the cylindrical portionside wall portions 76A are smooth curved surfaces that protrude towards the rear side in the rotation direction R of the impeller and connect the radial-directionouter end portions 761A of the cylindrical portion side wall portions and the radial-directioninner end portions 762A of the cylindrical portion side wall portions to each other. With the above, since merging with the air flowing in theflow passage 80A can be performed in a further smooth manner, the air blowing efficiency inside theflow passage 80A is improved. The mechanism in which the air blowing efficiency improves is similar to the mechanism in the cylindrical portionside wall portions 76 of the first embodiment. As illustrated inFIG. 6 , the rotation direction R of the impeller is clockwise when viewed from the lower side in the axial direction. - Note that the
communication portions 75A that penetrate in the radial direction may be formed of through holes that penetrate the motor covercylindrical portion 72A, which is an integral member, in the radial direction. As in the present embodiment, in a case in which the motor covercylindrical portion 72A is constituted by the first motor covercylindrical portion 724A and the second motor covercylindrical portion 725A, the first motor covercylindrical portion 724A and the second motor covercylindrical portion 725A can each be formed by molds that slide in the up-down direction; accordingly, mass-productiveness is improved when forming thecommunication portions 75A that penetrate the motor covercylindrical portion 72A in the radial direction, which is a more desirable configuration. - The
communication portions 75A are, desirably, configured in plural numbers in the circumferential direction. With the above, the heat generated in theinner space 83A of the motor cover cylindrical portion can be discharged to theouter space 82A of the motor cover cylindrical portion in a more effective manner. Furthermore, in the present embodiment, while amotor 10A is a so-called outer rotor type, themotor 10A may be an inner rotor type. In a case in which an inner rotor type motor is disposed, the air that circulates theinner space 83A of the motor cover cylindrical portion flows on the outer side of the motor cover that covers the outer side of themotor 10A. - Accordingly, the heat that has been generated in the coils and the like and that has been transmitted to the motor cover through the stator can be discharged to the
outer space 82A of the motor cover cylindrical portion. -
FIG. 7 is a perspective view of avacuum cleaner 100. Thevacuum cleaner 100 includes the blowing device of the present disclosure. With the above, in the blowing device mounted in thevacuum cleaner 100, the heat generated in the inner space of the motor cover cylindrical portion can be discharged to the outer space of the motor cover cylindrical portion in an efficient manner. Accordingly, avacuum cleaner 100 with a superior cooling function can be obtained. - While the exemplary embodiments of the present disclosure have been described above, the configuration of and the combination in each of the first embodiment and the second embodiment are examples, and adding of configurations, discarding thereof, replacing and other modifications can be made within the scope of the present disclosure. Furthermore, the present disclosure is not to be limited by the embodiments. Furthermore, the blowing device of the present disclosure can be used in electrical machineries other than the vacuum cleaner.
- While preferred embodiments of the present invention 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 invention. The scope of the present invention, therefore, is to be determined solely by the following claims.
Claims (16)
1. A blowing device comprising:
a motor that includes a shaft disposed along a central axis extending in an up-down direction;
an impeller fixed to the shaft, the impeller being disposed above the motor;
an impeller cover that surrounds an upper side and an outer side in a radial direction of the impeller, the impeller cover including an intake port at a middle;
a motor cover disposed on an outer side in a radial direction of the motor;
the motor including
a rotor portion fixed to the shaft, the rotor portion including a magnet,
a stator portion that opposes the magnet, and
a bearing that rotatably supports the shaft with respect to the stator portion;
the motor cover including
a tubular motor cover cylindrical portion that is open downwards;
an inner surface of the motor cover cylindrical portion opposing the motor with a gap in between in the radial direction; and
the motor cover cylindrical portion including a communication portion that communicates an inner space of the motor cover cylindrical portion and an outer space of the motor cover cylindrical portion to each other.
2. The blowing device according to claim 1 ,
wherein the communication portion is disposed in plural numbers in a circumferential direction.
3. The blowing device according to claim 1 ,
wherein a plurality of the communication portions are disposed at equal intervals in a circumferential direction.
4. The blowing device according to claim 1 ,
wherein the communication portion is open downwards in an axial direction.
5. The blowing device according to claim 1 ,
wherein the communication portion is a through hole that penetrates the motor cover cylindrical portion in the radial direction.
6. The blowing device according to claim 1 ,
wherein the motor cover cylindrical portion includes
a cylindrical portion side wall portion that connects an outer surface of the motor cover cylindrical portion and an inner surface of the motor cover cylindrical portion to each other, the cylindrical portion side wall portion constituting a side wall of the communication portion, and
wherein a radial-direction outer end portion of the cylindrical portion side wall portion is disposed on a front side in a rotation direction of the impeller with respect to a radial-direction inner end portion of the cylindrical portion side wall portion.
7. The blowing device according to claim 6 ,
wherein the cylindrical portion side wall portion is a smooth curved surface that connects the radial-direction outer end portion of the cylindrical portion side wall portion and the radial-direction inner end portion of the cylindrical portion side wall portion to each other and that protrudes towards a rear side in the rotation direction of the impeller.
8. The blowing device according to claim 1 ,
wherein the motor cover cylindrical portion includes
a cylindrical portion upper wall portion that connects an outer surface of the motor cover cylindrical portion and an inner surface of the motor cover cylindrical portion to each other, the cylindrical portion upper wall portion constituting a side wall of the communication portion, and
wherein a radial-direction outer end portion of the cylindrical portion upper wall portion is disposed below a radial-direction inner end portion of the cylindrical portion upper wall portion in an axial direction.
9. The blowing device according to claim 8 ,
wherein the cylindrical portion upper wall portion is a smooth curved surface that connects the radial-direction outer end portion of the cylindrical portion upper wall portion and the radial-direction inner end portion of the cylindrical portion upper wall portion to each other and that protrudes towards an upper side in the axial direction.
10. The blowing device according to claim 1 ,
wherein the motor cover includes a plurality of stator blades disposed on the outer surface of the motor cover cylindrical portion in the circumferential direction.
11. The blowing device according to claim 10 ,
wherein lower portions of the stator blades in the axial direction are disposed on a front side in a rotation direction of the impeller with respect to upper portions of the stator blades in the axial direction.
12. The blowing device according to claim 10 ,
wherein the motor cover includes a tubular blower cover that extends downwards from a lower end portion of the impeller cover, the blower cover being connected to outer ends of the stator blades in the radial direction.
13. The blowing device according to claim 12 ,
wherein the motor cover, the stator blades, and the blower cover are formed of an integral resin member, and
wherein at least a portion of the communication portion and at least a portion of the blower cover oppose each other in the radial direction.
14. The blowing device according to claim 8 ,
wherein the motor cover includes a plurality of stator blades disposed on the outer surface of the motor cover cylindrical portion in the circumferential direction, and
wherein a radial-direction outer end portion of the cylindrical portion upper wall portion is disposed below lower ends of the stator blades in the axial direction.
15. The blowing device according to claim 8 ,
wherein the motor cover includes a plurality of stator blades disposed on the outer surface of the motor cover cylindrical portion in the circumferential direction, and
wherein a radial-direction outer end portion of the cylindrical portion upper wall portion is disposed above lower ends of the stator blades in the axial direction.
16. A vacuum cleaner comprising:
the blowing device according to claim 1 .
Applications Claiming Priority (5)
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JP2016-086362 | 2016-04-22 | ||
PCT/JP2016/083019 WO2017082224A1 (en) | 2015-11-09 | 2016-11-08 | Blowing device and cleaner |
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Application Number | Title | Priority Date | Filing Date |
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PCT/JP2016/083019 Continuation WO2017082224A1 (en) | 2015-11-09 | 2016-11-08 | Blowing device and cleaner |
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US20180242799A1 true US20180242799A1 (en) | 2018-08-30 |
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US15/969,871 Abandoned US20180242799A1 (en) | 2015-11-09 | 2018-05-03 | Blowing device, and vacuum cleaner |
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EP (1) | EP3376044A4 (en) |
JP (1) | JPWO2017082224A1 (en) |
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Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN113074137A (en) * | 2020-01-06 | 2021-07-06 | 广东威灵电机制造有限公司 | Air supply device and dust collector |
DE102020119881A1 (en) | 2020-07-28 | 2022-02-03 | Ebm-Papst Mulfingen Gmbh & Co. Kg | Tube fan designed as a radial fan |
DE102020129084A1 (en) | 2020-10-23 | 2022-04-28 | Ebm-Papst Mulfingen Gmbh & Co. Kg | duct fan |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2545269B (en) * | 2015-12-11 | 2018-02-28 | Dyson Technology Ltd | An electric motor |
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JP7230585B2 (en) * | 2019-02-28 | 2023-03-01 | 日本電産株式会社 | blowers and vacuum cleaners |
CN112524090B (en) * | 2019-09-19 | 2022-09-20 | 日本电产株式会社 | Air supply device and electromechanical device |
CN112524061A (en) * | 2019-09-19 | 2021-03-19 | 日本电产株式会社 | Air supply device and electromechanical device |
JP7399682B2 (en) * | 2019-10-30 | 2023-12-18 | 日立グローバルライフソリューションズ株式会社 | Electric blower and vacuum cleaner equipped with it |
CN114635874A (en) * | 2022-03-16 | 2022-06-17 | 广州大学 | High-efficient wind-guiding casing is used to dust catcher motor |
Family Cites Families (18)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5198807U (en) * | 1975-02-06 | 1976-08-07 | ||
JPS5641119Y2 (en) * | 1976-10-25 | 1981-09-25 | ||
JPS60166798A (en) * | 1984-02-10 | 1985-08-30 | Matsushita Electric Ind Co Ltd | Motor-driven blower |
GB2190429B (en) * | 1986-04-14 | 1990-10-17 | Hitachi Ltd | An electric blower |
JPH11125197A (en) * | 1997-10-22 | 1999-05-11 | Matsushita Electric Ind Co Ltd | Motor-driven blower |
FR2800931B1 (en) * | 1999-11-09 | 2004-01-23 | Alstom | VENTILATION DEVICE AND ELECTRIC RAIL TRACTION MOTOR EQUIPPED WITH SUCH A DEVICE |
US6461124B1 (en) * | 2000-12-14 | 2002-10-08 | Ametek, Inc. | Through-flow blower with cooling fan |
JP2003074496A (en) * | 2001-08-31 | 2003-03-12 | Sumiyoshi Kinzoku Kk | Fan motor device |
CN1223306C (en) * | 2002-05-31 | 2005-10-19 | 乐金电子(天津)电器有限公司 | Centrifugal blower for vacuum cleaner |
JP2010059811A (en) * | 2008-09-02 | 2010-03-18 | Panasonic Corp | Electric blower and vacuum cleaner using the same |
JP2010281231A (en) * | 2009-06-03 | 2010-12-16 | Panasonic Corp | Electric blower and vacuum cleaner having the same |
JP2011080427A (en) * | 2009-10-08 | 2011-04-21 | Panasonic Corp | Electric blower and vacuum cleaner using the same |
JP2012202282A (en) * | 2011-03-25 | 2012-10-22 | Panasonic Corp | Electric blower and electric cleaner using the same |
JP2012202283A (en) * | 2011-03-25 | 2012-10-22 | Panasonic Corp | Electric blower and electric cleaner using the same |
JP2013024134A (en) * | 2011-07-21 | 2013-02-04 | Panasonic Corp | Electric blower and vacuum cleaner |
JP2013029034A (en) * | 2011-07-27 | 2013-02-07 | Panasonic Corp | Electric blower and vacuum cleaner |
JP6011914B2 (en) * | 2012-07-05 | 2016-10-25 | 日本電産株式会社 | Centrifugal fan |
JP6585873B2 (en) * | 2013-08-09 | 2019-10-02 | 日本電産株式会社 | Blower and vacuum cleaner |
-
2016
- 2016-11-08 EP EP16864185.0A patent/EP3376044A4/en not_active Withdrawn
- 2016-11-08 CN CN201680065014.9A patent/CN108350899B/en active Active
- 2016-11-08 WO PCT/JP2016/083019 patent/WO2017082224A1/en active Application Filing
- 2016-11-08 JP JP2017550321A patent/JPWO2017082224A1/en active Pending
-
2018
- 2018-05-03 US US15/969,871 patent/US20180242799A1/en not_active Abandoned
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
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CN113074137A (en) * | 2020-01-06 | 2021-07-06 | 广东威灵电机制造有限公司 | Air supply device and dust collector |
DE102020119881A1 (en) | 2020-07-28 | 2022-02-03 | Ebm-Papst Mulfingen Gmbh & Co. Kg | Tube fan designed as a radial fan |
DE102020129084A1 (en) | 2020-10-23 | 2022-04-28 | Ebm-Papst Mulfingen Gmbh & Co. Kg | duct fan |
Also Published As
Publication number | Publication date |
---|---|
JPWO2017082224A1 (en) | 2018-08-23 |
EP3376044A1 (en) | 2018-09-19 |
EP3376044A4 (en) | 2019-08-07 |
WO2017082224A1 (en) | 2017-05-18 |
CN108350899A (en) | 2018-07-31 |
CN108350899B (en) | 2020-06-30 |
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