WO2016194253A1 - 送風装置および掃除機 - Google Patents
送風装置および掃除機 Download PDFInfo
- Publication number
- WO2016194253A1 WO2016194253A1 PCT/JP2015/080698 JP2015080698W WO2016194253A1 WO 2016194253 A1 WO2016194253 A1 WO 2016194253A1 JP 2015080698 W JP2015080698 W JP 2015080698W WO 2016194253 A1 WO2016194253 A1 WO 2016194253A1
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- WO
- WIPO (PCT)
- Prior art keywords
- impeller
- ring
- housing
- outer peripheral
- stationary blade
- Prior art date
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Classifications
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- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
- A47L5/00—Structural features of suction cleaners
- A47L5/12—Structural features of suction cleaners with power-driven air-pumps or air-compressors, e.g. driven by motor vehicle engine vacuum
- A47L5/22—Structural features of suction cleaners with power-driven air-pumps or air-compressors, e.g. driven by motor vehicle engine vacuum with rotary fans
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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
- 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
- F04D29/00—Details, component parts, or accessories
- F04D29/02—Selection of particular materials
- F04D29/023—Selection of particular materials 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
- F04D29/40—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
- F04D29/40—Casings; Connections of working fluid
- F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
- F04D29/44—Fluid-guiding means, e.g. diffusers
- F04D29/441—Fluid-guiding means, e.g. diffusers especially adapted for elastic fluid pumps
- F04D29/444—Bladed diffusers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- 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
- F04D29/26—Rotors specially for elastic fluids
- F04D29/28—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps
- F04D29/281—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps for fans or blowers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2250/00—Geometry
- F05D2250/50—Inlet or outlet
- F05D2250/52—Outlet
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2250/00—Geometry
- F05D2250/70—Shape
Definitions
- the present invention relates to a blower and a vacuum cleaner.
- Patent Literature 1 As an air blower mounted in a vacuum cleaner, there are those disclosed in Patent Literature 1 and Patent Literature 2.
- a flow path through which exhaust gas passes is configured between the outer peripheral surface of the motor case and a cylindrical air guide that covers the motor case.
- the flow path is provided with guide vanes (stator vanes) extending along the exhaust direction, and exhaust efficiency is enhanced by adjusting the air flow.
- the flow path described above is configured by assembling a cylindrical air guide around the motor cover. For this reason, the radial width of the flow path along the circumferential direction varies depending on the position in the circumferential direction depending on the assembly accuracy of the air guide and the motor cover, and the pressure may become unstable and exhaust efficiency may be reduced.
- An exemplary embodiment of the present invention aims to provide an air blower in which the radial width of a flow path is constant with high accuracy and the exhaust efficiency is increased.
- An air blower includes a motor having a shaft disposed along a central axis extending in the vertical direction and a bearing that rotatably supports the shaft, and an upper end side of the shaft
- An impeller connected to the impeller, an impeller housing that houses the impeller and has an intake port on the upper side, a plurality of stationary blades located on the lower side of the impeller housing, and a cylindrical shape located on the radially inner side of the stationary blade
- a first ring and a cylindrical second ring positioned radially outside the stationary blade and fixed to the impeller housing.
- the stationary blade, the first ring, and the second ring are each a single ring.
- the stationary blade support part which is one member is comprised.
- the present invention it is possible to provide a blower device in which the width in the radial direction of the flow path is constant with high accuracy and the exhaust efficiency is increased.
- FIG. 1 is a sectional view showing the air blower of an embodiment.
- FIG. 2 is an exploded perspective view of the blower according to the embodiment.
- FIG. 3 is a perspective view of the motor according to the embodiment as viewed from below.
- FIG. 4 is a perspective view of the stator according to the embodiment.
- FIG. 5 is an exploded perspective view showing a stator, a circuit board, and a lower lid.
- FIG. 6 is a plan sectional view of the motor.
- FIG. 7 is an explanatory view showing a mounting mode of the rotation sensor.
- FIG. 8 is a perspective view of the stationary blade member as viewed from below.
- FIG. 9 is an enlarged cross-sectional view illustrating a part of the impeller, the stationary blade member, and the impeller housing.
- FIG. 10 is a partial side view of a stationary blade member.
- FIG. 11 is a plan view of an impeller rotor blade.
- FIG. 12 is a cross-sectional view showing a blower device according to a first modification.
- FIG. 13 is an exploded perspective view of the air blower of the first modification.
- FIG. 14 is a perspective view of the motor of Modification 1 as viewed from below.
- FIG. 15 is a partial cross-sectional perspective view of the exhaust guide member of Modification 1.
- FIG. 16 is an enlarged cross-sectional view illustrating a part of the impeller, the exhaust guide member, and the impeller housing according to the first modification.
- FIG. 17 is a cross-sectional view showing an impeller that can be employed as a second modification.
- FIG. 18 is a perspective view showing a blower of a third modification.
- FIG. 19 is a perspective view illustrating a state in which the impeller cover portion of the air blower according to Modification 3 is removed.
- FIG. 20 is a plan view of the air blower of the third modification. 21 is a cross-sectional view taken along line AA in FIG. 22 is a cross-sectional view taken along line BB of FIG.
- FIG. 23 is a view for explaining the guide blade of the third modification.
- 24 is a cross-sectional view taken along line AA of FIG. 20 when the main body cover portion is a single member in the third modification.
- FIG. 25 is a cross-sectional view of a blower device according to a fourth modification.
- FIG. 26 is a cross-sectional view of a blower device of Modification 4 in the case where the motor housing is a single member.
- FIG. 27 is a perspective view of a vacuum cleaner having a blower.
- an XYZ coordinate system is appropriately shown as a three-dimensional orthogonal coordinate system.
- the Z-axis direction is a direction parallel to the axial direction of the central axis J shown in FIG.
- the X-axis direction is a direction orthogonal to the Z-axis direction and is the left-right direction in FIG.
- the Y-axis direction is a direction orthogonal to both the X-axis direction and the Z-axis direction.
- the direction in which the central axis J extends is the up-down direction.
- the positive side (+ Z side) in the Z-axis direction is referred to as “upper side (upper axial direction)”
- the negative side ( ⁇ Z side) in the Z-axis direction is referred to as “lower side (lower axial direction)”.
- the up-down direction, the upper side, and the lower side are names used for explanation only, and do not limit the actual positional relationship and direction.
- a direction parallel to the central axis J (Z-axis direction) is simply referred to as an “axial direction”
- a radial direction around the central axis J is simply referred to as a “radial direction”.
- the circumferential direction centered on is simply referred to as the “circumferential direction”.
- FIG. 1 is a cross-sectional view showing the blower of the present embodiment.
- FIG. 2 is an exploded perspective view of the air blower according to the present embodiment.
- the blower device 1 includes a motor 10, an impeller 70, an impeller housing 80, a plurality of stationary vanes, a first ring 66 b, and a second ring 65.
- the plurality of stationary blades includes an upper stationary blade 67a and a lower stationary blade 67b, which will be described later.
- a stationary blade 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 stationary blade member 60.
- An impeller 70 is accommodated between the stationary blade member 60 and the impeller housing 80.
- the impeller 70 is attached to the motor 10 so as to be rotatable around the central axis J.
- FIG. 3 is a perspective view of the motor according to the present embodiment as viewed from below.
- the motor 10 includes a housing 20, a lower lid 22, a rotor 30 having a shaft 31, a stator 40, a circuit board 50, a lower bearing 52 a and an upper bearing 52 b. That is, the motor 10 further includes a housing 20. More specifically, the motor 10 includes a shaft 31 disposed along a central axis J extending in the vertical direction, and bearings 52a and 52b that rotatably support the shaft 31.
- the housing 20 is a covered cylindrical container that houses the rotor 30 and the stator 40.
- the housing 20 surrounds the stator 40 from the outside in the radial direction.
- the housing 20 includes a cylindrical peripheral wall 21, an upper lid portion 23 positioned at the upper end of the peripheral wall 21, and an upper bearing holding portion 27 positioned at the center of the upper lid portion 23.
- a stator 40 is fixed to the inner surface of the housing 20.
- the upper bearing holding portion 27 has a cylindrical shape that protrudes upward from the center portion of the upper lid portion 23.
- the upper bearing holding part 27 holds the upper bearing 52b inside.
- FIGS. 1 and 3 on the upper side of the peripheral wall of the housing 20, through holes 25 and 26 that penetrate the housing 20 in the radial direction are provided. Three through holes 25 and three through holes 26 are alternately positioned around the axis on the peripheral wall of the housing 20 (see FIG. 6). With this configuration, a part of the air exhausted from an exhaust port 95 described later flows into the housing 20, and the stator core 41 and the coil 42 can be cooled.
- a step portion 28 is provided between the peripheral wall 21 of the housing 20 and the upper lid portion 23 so as to surround the upper lid portion 23 around the axis.
- a lower lid 22 is attached to the lower ( ⁇ Z side) opening of the housing 20.
- a cylindrical lower bearing holding portion 22 c that protrudes downward from the lower surface of the lower lid 22 is provided at the center of the lower lid 22.
- the lower bearing holding portion 22c holds the lower bearing 52a.
- the lower lid 22 is provided with arc-shaped through holes 22a having a radial width at three locations around the axis.
- three cutout portions 22 b obtained by cutting out the outer peripheral portion of the lower lid 22 in a straight line are provided.
- a gap between the lower opening end 20 a of the housing 20 and the notch 22 b is a lower opening 24 of the motor 10.
- the rotor 30 includes a shaft 31, a rotor magnet 33, a lower magnet fixing member 32, and an upper magnet fixing member 34.
- the rotor magnet 33 has a cylindrical shape that surrounds the shaft 31 radially around the axis ( ⁇ z direction).
- the lower magnet fixing member 32 and the upper magnet fixing member 34 have a cylindrical shape having a diameter equivalent to that of the rotor magnet 33.
- the lower magnet fixing member 32 and the upper magnet fixing member 34 are attached to the shaft 31 by sandwiching the rotor magnet 33 from both sides in the axial direction.
- the upper magnet fixing member 34 has a small-diameter portion 34a having a smaller diameter than the lower side (the rotor magnet 33 side) at the upper portion in the central axis direction.
- the shaft 31 is disposed along the central axis J.
- the shaft 31 is supported by the lower bearing 52a and the upper bearing 52b so as to be rotatable around the axis ( ⁇ z direction).
- the impeller 70 is connected to the upper end side of the shaft 31.
- the impeller 70 is integrated with the shaft 31 and rotates around the axis.
- FIG. 4 is a perspective view of the stator of the present embodiment.
- FIG. 5 is an exploded perspective view showing the stator 40, the circuit board 50, and the lower lid 22.
- FIG. 6 is a plan sectional view of the motor 10.
- the stator 40 is located on the radially outer side of the rotor 30.
- the stator 40 surrounds the rotor 30 around the axis ( ⁇ z direction).
- the stator 40 includes a stator core 41, a plurality (three) of upper insulators 43, a plurality (three) of lower insulators 44, and a coil 42.
- the stator core 41 has a core back portion 41a and a plurality (three) of teeth portions 41b.
- the core back portion 41a has a ring shape around the central axis.
- the core back portion 41a has a configuration in which three linear portions 41c and three arc portions 41d are alternately positioned around the axis.
- Each of the tooth portions 41b extends radially inward from the inner peripheral surface of the linear portion 41c.
- the teeth 41b are arranged at equal intervals in the circumferential direction.
- On the upper surface of the arc portion 41d of the core back portion 41a an inclined member 46 that guides the exhaust to the inside of the stator 40 is disposed.
- the inclined member 46 has a shape in which the thickness is reduced from the radially outer side toward the inner side.
- the lower insulator 44 is an insulating member that covers a part of the lower surface and side surface of the stator core 41.
- the lower insulator 44 is provided corresponding to each of the three tooth portions 41b.
- the lower insulator 44 includes a lower outer peripheral wall portion 44a positioned below the core back portion 41a, a lower inner peripheral wall portion 44c positioned below the tip of the tooth portion 41b, and a lower outer peripheral wall portion 44a.
- the lower inner peripheral wall portion 44c is connected in the radial direction, and has a lower insulating portion 44b positioned below the portion around which the coil of the tooth portion 41b is wound.
- the upper insulator 43 and the lower insulator 44 are arranged so as to sandwich the teeth portion 41b of the stator core 41 in the vertical direction.
- the coil 42 is wound around the tooth portion 41 b covered with the upper insulating portion 43 d of the upper insulator 43 and the lower insulating portion 44 b of the lower insulator 44.
- the three upper outer peripheral wall portions 43 a located on the core back portion 41 a of the stator core 41 surround the coil 42 on the upper side of the stator core 41.
- the upper outer peripheral wall 43a has a first side end face 43b and a second side end face 43c at both ends in the circumferential direction.
- the first side end surface 43b is an inclined surface that is inclined with respect to the radial direction and faces radially outward.
- the second side end surface 43c is an inclined surface that is inclined with respect to the radial direction and faces inward in the radial direction.
- a portion located on the straight portion 41c is a flat surface 43f extending in the axial direction aligned with the outer peripheral surface of the straight portion 41c.
- arc-shaped surfaces arranged along the inner peripheral surface of the housing 20 are provided.
- the upper outer peripheral wall portions 43a adjacent in the circumferential direction are separated from each other at a predetermined interval.
- the first side end face 43b of one upper outer peripheral wall 43a and the second side end face 43c of the other upper outer peripheral wall 43a are arranged facing each other in the circumferential direction.
- the inclination degree with respect to the radial direction of the first side end face 43b is different from the inclination degree with respect to the radial direction of the second side end face 43c.
- the circumferential width of the opening 90 on the radially outer side of the gap CL formed between adjacent upper outer peripheral wall portions 43a is wider than the circumferential width of the opening 91 on the radially inner side. .
- positioned on the core back part 41a is located below the clearance gap CL.
- the inclined member 46 is sandwiched between the first side end face 43b and the second side end face 43c.
- the gap CL is located inside the through hole 26 of the housing 20.
- the through hole 26 and the gap CL serve as an air flow path that guides exhaust flowing from the outside of the housing 20 to the inside of the stator 40.
- An inclination direction (a direction from the outer side in the radial direction toward the inner side) of the gap CL as viewed from above coincides with a circulation direction in the circumferential direction of the exhaust discharged from the stationary blade member 60. That is, it coincides with the rotation direction of the impeller 70.
- the three lower outer peripheral wall portions 44a located on the lower side of the core back portion 41a surround the coil 42 on the lower side of the stator core 41. Although there is a gap between the lower outer peripheral wall portions 44a adjacent to each other in the circumferential direction, the lower outer peripheral wall portions 44a may be in contact with each other in the circumferential direction.
- the portion located below the straight portion 41c of the core back portion 41a is a flat surface 44d extending in the axial direction aligned with the outer peripheral surface of the straight portion 41c.
- arc-shaped surfaces arranged along the inner peripheral surface of the housing 20 are provided.
- a plurality (three in the drawing) of plate-like portions 45 extending in the axial direction are provided on the flat surface 44d. As shown in FIG. 6, the plate-like portion 45 stands substantially perpendicular to the flat surface 44d. The distal end on the radially outer side of the plate-like portion 45 reaches the inner peripheral surface of the housing 20. The plate-like portion 45 divides a region between the lower outer peripheral wall portion 44a and the housing 20 into a plurality of regions in the circumferential direction.
- FIG. 7 is an explanatory diagram showing how the rotation sensor 51 is mounted.
- the rotation sensor 51 is disposed between the distal end portions of the lower inner peripheral wall portions 44 c adjacent in the circumferential direction.
- the three rotation sensors 51 are arranged at equal intervals of 120 ° in the circumferential direction.
- the radially inner surface of the rotation sensor 51 faces the rotor magnet 33.
- the rotor magnet 33 is disposed in the central portion of the rotor 30 in the axial direction. Therefore, the rotation sensor 51 is connected to the circuit board 50 by the lead 51 a having a length corresponding to the axial length from the circuit board 50 to the rotor magnet 33.
- a mechanism for supporting the rotation sensor 51 may be provided at the tip of the lower inner peripheral wall 44c.
- a recess for inserting the rotation sensor 51 can be provided to restrict the radial movement of the rotation sensor 51.
- the rotation sensor 51 may be fixed to the lower inner peripheral wall 44c by snap fitting or the like.
- the lower lid 22 is attached to the open end 20 a of the housing 20 that houses the stator 40 and the circuit board 50. As shown in FIG. 1, at least a part of the three through holes 22 a of the lower lid 22 is located on the radially outer side than the outer peripheral end of the main body 50 a of the circuit board 50.
- the cutout portion 22b on the outer periphery of the lower lid 22 is disposed so as to substantially coincide with the straight portion 41c of the stator core 41, the flat surface 43f of the upper insulator 43, and the flat surface 44d of the lower insulator 44 when viewed in the axial direction.
- the lower opening 24 on the lower surface of the motor 10 serves as an exhaust port for the air flow path FP between the stator 40 and the housing 20.
- the stationary blade member 60 includes a first stationary blade member 61 a and a second stationary blade member (static blade support portion) 61 b.
- the first stator blade member 61 a and the second stator blade member 61 b are stacked in the axial direction and attached to the upper surface of the motor 10.
- the blower device 1 further includes a lower stationary blade support ring 62.
- the first stationary blade member 61a includes a lower stationary blade support ring (third ring) 62, a mounting ring 63, three connecting portions 64, and a plurality of lower stationary blades 67b.
- the lower stationary blade support ring 62 and the attachment ring 63 are arranged coaxially and are connected by three connecting portions 64 extending in the radial direction.
- the three connecting portions 64 are arranged at regular intervals of 120 ° in the circumferential direction.
- the connecting portion 64 has a through hole 64a penetrating in the axial direction.
- the three through holes 64a are arranged at equal intervals of 120 ° in the circumferential direction.
- the attachment ring 63 has a concave groove 63a concentric with the attachment ring 63 on the upper surface.
- the second stationary blade member 61b corresponds to a “static blade support portion”.
- the lower stator blade support ring 62 corresponds to a “third ring”.
- the outer peripheral ring 65 has a stepped portion 65a that extends over the entire circumference on the outer peripheral side of the upper end portion.
- the plurality of upper stationary blades 67 a are located on the lower side of the impeller housing 80.
- the plurality of upper stator blades 67a connect the outer peripheral surface of the upper stator blade support ring 66b and the inner peripheral surface of the outer ring 65 in the radial direction. That is, the upper stator blade 67a, the upper stator blade support ring 66b, and the outer ring 65 are a single member and constitute the second stator blade member 61b. Thereby, the coaxiality with the motor 10, the 2nd stator blade member 61b, and the outer periphery ring 65 can be raised.
- the support 66a has a mounting ring 68 that extends downward from the lower surface of the central portion, and three cylindrical convex portions 69 that protrude downward from the lower surface of the support 66a.
- the attachment ring 68 includes a cylindrical tube portion 68a and an annular protrusion 68b that protrudes downward from the outer peripheral portion in the radial direction on the lower end surface of the tube portion 68a.
- the three cylindrical protrusions 69 have the same diameter and height, and are arranged at equal intervals of 120 ° in the circumferential direction.
- the cylindrical convex portion 69 is hollow, and has a through hole 69b penetrating in the axial direction at the center of the lower end surface 69a.
- the cylindrical convex portion 69 corresponds to a “second fixing portion”. That is, the second stationary blade member 61 b has a cylindrical convex portion (second fixed portion) 69.
- the attachment ring 68 and the upper stator blade support ring 66b function as a fixing portion (first fixing portion) that fixes the first stator blade member 61a.
- these fixing portions fix the lower stator blade support ring (third ring) 62 which is a part of the first stator blade member 61a by fixing the first stator blade member 61a.
- the second stator blade member 61b has a first fixing portion to which the lower stator blade support ring 62 is fixed.
- FIG. 10 is a partial side view of the stationary blade member 60.
- the same number of upper stator blades 67a and lower stator blades 67b are arranged in the circumferential direction.
- the upper stationary blade 67a and the lower stationary blade 67b correspond one-on-one and are arranged side by side in the axial direction.
- the inclination angle of the upper stationary blade 67a with respect to the axial direction is larger than the inclination angle of the lower stationary blade 67b with respect to the axial direction.
- the upper stationary blade 67a is disposed at a relatively large angle so that the exhaust gas flowing in the direction inclined in the rotation direction of the impeller 70 can efficiently flow between the upper stationary blades 67a.
- the lower stationary blade 67b guides the exhaust gas downward so that the exhaust gas discharged from the exhaust port 95 does not flow radially outward.
- the impeller 70 is connected to the upper end side of the shaft 31.
- the impeller 70 discharges the fluid sucked from the intake port 70a opened on the upper side toward the outside in the radial direction through the internal flow path.
- the impeller 70 includes an impeller body 71 and an impeller hub 72.
- the impeller main body 71 includes a base portion 73, a plurality of moving blades 74, and a shroud 75. That is, the impeller 70 includes a base portion 73, a plurality of moving blades 74, and a shroud 75.
- the base portion 73 is located below the rotor blade 74.
- the impeller 70 has a plurality of moving blades and a disk-shaped base portion 73 located below the moving blades.
- the base portion 73 has a through hole 73a penetrating in the axial direction at the center portion.
- the periphery of the through hole 73a of the base portion 73 is a conical inclined surface portion 73b projecting upward.
- the rotor blades 74 are plate-like members that are curved in the circumferential direction and extend from the inner side to the outer side in the radial direction on the upper surface of the base portion 73.
- the moving blades 74 are arranged upright along the axial direction.
- the shroud 75 has a cylindrical shape that is tapered toward the upper side in the axial direction.
- the central opening of the shroud 75 is the air inlet 70 a of the impeller 70.
- the base portion 73 and the shroud 75 are connected by a moving blade 74.
- FIG. 11 is a plan view of the rotor blade 74 of the impeller 70.
- a plurality of rotor blades 74 as shown in FIG. 11, is disposed along the upper surface of the base portion 73 in the circumferential direction (theta Z direction). As shown in FIG. 1, the moving blade 74 stands vertically from the upper surface of the base portion 73 along the axial direction.
- three types of moving blades 74 are arranged at equal intervals along the circumferential direction in the same type.
- a plurality of (three) first blades 74a, a plurality (three) second blades 74b, and a plurality (six) third blades are used.
- 74c is included.
- the three first rotor blades 74a are arranged at equal intervals of 120 ° in the circumferential direction.
- the 2nd moving blade 74b is arrange
- the three second rotor blades 74b are also arranged at equal intervals of 120 ° in the circumferential direction.
- the third moving blade 74c is disposed at an intermediate position between the first moving blade 74a and the second moving blade 74b adjacent in the circumferential direction.
- the six third rotor blades 74c are arranged at equal intervals every 60 ° in the circumferential direction.
- the inflection point CP11 of the first moving blade 74a, the inflection point CP21 of the second moving blade 74b, and the inflection point CP31 of the third moving blade 74c are the same in the base portion 73. It arrange
- the inflection point CP12 of the first moving blade 74a, the inflection point CP22 of the second moving blade 74b, and the end P3 of the third moving blade 74c are the same radial position C2 in the base portion 73. Placed on top. Further, the curvature radius of the portion between the radial positions C1 and C2 of the first moving blade 74a, the curvature radius of the portion between the radial positions C1 and C2 of the second moving blade 74b, and the third movement The radii of curvature of the portions between the radial positions C1 and C2 of the wing 74c coincide with each other.
- the inflection point CP13 of the first moving blade 74a and the end P2 of the second moving blade 74b are disposed on the same radial position C3 in the base portion 73. Further, the radius of curvature of the portion between the radial positions C2 and C3 of the first moving blade 74a and the radius of curvature of the portion between the radial positions C2 and C3 of the second moving blade 74b coincide with each other.
- the radial position C3 coincides with the intake port 80a of the impeller housing 80 when viewed from the axial direction. Therefore, only the portion on the inner peripheral side of the inflection point CP13 of the first moving blade 74a is disposed inside the intake port 80a.
- the impeller hub 72 includes a cylindrical portion 72a extending in the axial direction, a disk-shaped flange portion 72b extending radially outward from a lower portion of the outer peripheral surface of the cylindrical portion 72a, and a plurality of convex portions 72c protruding upward from the upper surface of the flange portion 72b. And having.
- the cylindrical portion 72a has a tapered slope portion 72d that is tapered at the upper end portion.
- the impeller hub 72 is attached to the impeller main body 71 by inserting the cylindrical portion 72a into the through hole 73a of the base portion 73 from below.
- the cylinder part 72a may be press-fitted into the through hole 73a, or may be fixed using an adhesive or the like.
- the flange portion 72b of the impeller hub 72 supports the impeller body 71 from below.
- the convex portion 72 c on the flange portion 72 b fits into the concave portion 73 c on the lower surface of the base portion 73.
- the circumferential relative movement between the impeller body 71 and the impeller hub 72 is restricted by fitting the convex portion 72c and the concave portion 73c.
- the inclined surface portion 72d at the tip of the cylindrical portion 72a of the impeller hub 72 and the inclined surface portion 73b of the base portion 73 are smoothly connected in the vertical direction.
- the inclined surface portion 72d and the inclined surface portion 73b constitute an annular inclined surface 70b that guides the fluid sucked from the intake port 70a of the impeller 70 radially outward.
- the length of the cylindrical portion 72a (the inclined surface portion 72d) can be increased without increasing the inclined surface portion 73b of the base portion 73.
- the maximum height of the annular slope 70b can be increased. Therefore, it is possible to realize an annular inclined surface 70b having a preferable shape while suppressing an increase in the thickness of the base portion 73.
- the impeller hub 72 is preferably made of metal. Thereby, the shaft 31 and the impeller 70 can be firmly connected. Therefore, the impeller 70 can be stably rotated at a high speed. Moreover, since the slope part 72d can be made into a metal surface, the surface of the upper end of the annular slope 70b 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 72a of the impeller hub 72 from below. As shown in FIGS. 1 and 9, the impeller 70 connected to the shaft 31 is disposed inside the annular protrusion 66c of the second stationary blade member 61b. Therefore, the protrusion 66 c is located in the vicinity of the exhaust port 70 c of the impeller 70.
- the protruding portion 66c protrudes upward from the upper end of the upper stationary blade support ring 66b.
- the protrusion 66 c is located on the radially outer side of the impeller 70.
- the second stationary blade member 61 b has an annular projecting portion 66 c that projects upward and is positioned on the radially outer side of the impeller 70.
- the protrusion 66c guides the exhaust discharged from the impeller 70 downward together with the exhaust guide 83 of the impeller housing 80 described later.
- the outer peripheral surface of the protrusion 66c is an inclined surface that is inclined downward as it goes radially outward.
- the outer peripheral surface of the projecting portion 66c has a smooth curved surface that is convex outward.
- the impeller housing 80 accommodates the impeller 70 and has an intake port 80a on the upper side.
- the impeller housing 80 has a cylindrical shape that is tapered toward the upper side in the axial direction.
- the impeller housing 80 includes an intake guide portion 81 located at the opening end of the intake port 80a.
- the impeller housing 80 includes an impeller housing body 82 that covers the upper side of the impeller 70, an exhaust guide portion 83 that extends radially outward and downward from the outer periphery of the impeller housing body 82, and an upper side from the outer periphery of the exhaust guide portion 83.
- an outer peripheral mounting ring that is fixed to the outer peripheral ring 65.
- the impeller housing main body 82 has a cross-sectional shape that follows the shroud 75 of the impeller 70.
- the inner side surface (lower surface) of the impeller housing main body 82 faces the outer side surface (upper surface) of the shroud 75 at a uniform interval.
- An annular intake guide portion 81 protruding inward in the radial direction is located at the upper end portion on the inner peripheral side of the impeller housing main body portion 82. As shown in FIG. 9, the intake guide portion 81 covers the upper end surface 75 b of the shroud 75 from the upper side. A narrow gap extending in the radial direction exists between the lower surface of the intake guide portion 81 and the upper end surface 75 b of the shroud 75.
- the outer peripheral end portion 82a of the impeller housing main body 82 is bent around the outer peripheral end of the shroud 75 downward. Between the inner peripheral surface of the outer peripheral side end portion 82a and the outer end surface of the shroud 75, there is a narrow gap that extends upward in the axial direction.
- the inner peripheral surface of the exhaust guide portion 83 guides the exhaust discharged radially outward from the impeller 70 downward together with the outer peripheral surface of the protruding portion 66c of the second stationary blade member 61b located on the lower side of the impeller 70.
- An exhaust passage 92 is configured.
- the exhaust passage 92 is connected to the exhaust passage 93 of the stationary blade member 60 as shown in FIG.
- the exhaust passage 93 of the stationary blade member 60 includes a passage between the upper stationary blade 67a and a passage between the lower stationary blade 67b.
- a connection part to the outside of the exhaust passage 93 is an exhaust port 95.
- the blower device 1 of the present embodiment rotates the impeller 70 by the motor 10 to draw air into the impeller 70 from the air inlet 80 a, and has a diameter via the air flow path in the impeller 70. Release air outward in the direction.
- the exhaust discharged from the impeller 70 flows into the region between the upper stationary blades 67a via the exhaust passage 92.
- the upper stationary blade 67a rectifies the exhaust and discharges it downward.
- the lower stationary blade 67b guides radially outward while directing the exhaust flow direction downward. Thereafter, the exhaust is discharged from the exhaust port 95 to the outside of the blower 1.
- the upper stator blade 67a, the upper stator blade support ring 66b, and the outer ring 65 are a single member.
- being a single member means a continuous and integral member. More specifically, it means that they are simultaneously formed by the same manufacturing process. For example, it is assumed that they are formed simultaneously by molding using a mold.
- the width of the radial gap located between the outer periphery of the upper stationary blade support ring 66b and the inner periphery of the outer peripheral ring 65 is set in the circumferential direction. Can be constant with high accuracy.
- the cross-sectional area of the flow path of the exhaust port 95 can be made constant along the circumferential direction, the pressure of the exhaust along the circumferential direction can be stabilized, and the exhaust efficiency can be increased.
- a part of the exhaust discharged downward from the exhaust port 95 flows downward along the outer peripheral surface of the housing 20 of the motor 10. Further, another part of the exhaust discharged from the exhaust port 95 flows into the motor 10 through the through holes 25 and 26 provided in the housing 20.
- the exhaust gas flows downward.
- the outer peripheral surface of the straight portion 41c (stator core 41) is exposed and cooled by exhaust.
- a plurality of plate-like portions 45 are located in the air flow path FP and rectifies the exhaust gas flowing through the air flow path FP. With this configuration, the ventilation efficiency of the exhaust gas flowing through the air flow path FP is improved.
- the exhaust gas flowing through the air flow path FP is discharged downward from the lower opening 24 of the motor 10.
- the first side end surface 43b, the second side end surface 43c, and the inclined member 46 constituting the gap CL guide the exhaust gas passing through the gap CL to the side surface of the coil 42. That is, as compared with the case where the inclined member 46 is not provided, it is possible to reduce the exhaust efficiency passing through the gap CL and hitting the upper surface of the circular arc portion 41d and lowering the exhaust efficiency. With this configuration, the coil 42 that is the heat generating portion of the motor 10 can be efficiently cooled.
- the exhaust flows downward around the coil 42 and is discharged downward from the through hole 22a on the lower surface of the motor 10.
- the annular exhaust port 95 around the axis is disposed above the motor 10. This eliminates the need to provide an air flow path member for exhaust on the radially outer peripheral side of the motor 10. As a result, the motor 10 having a larger diameter can be used, and the blowing capacity can be improved without increasing the diameter of the blowing device 1. Alternatively, the blower 1 can be downsized while maintaining the blowing ability.
- the exhaust port 95 only needs to be disposed above the stator 40. Since the relationship between the capacity and the diameter of the motor 10 is determined by the size of the stator 40, if the exhaust port 95 is disposed at least above the stator 40, the exhaust port is located inside the radially outer end of the motor 10. 95 can be arranged.
- the blower 1 has three gaps CL and three air flow paths FP.
- the stator core 41 and the coil 42 can be efficiently cooled by the air flowing radially inward from the gap CL, and the stator core 41 is cooled by the air flowing in the axial direction through the air flow path FP. Can do.
- FIG. 12 is a cross-sectional view showing the blower 101 of the first modification.
- FIG. 13 is an exploded perspective view of the blower 101 of the present modification.
- symbol is attached
- the blower device 101 includes a motor 110, an impeller 70, an exhaust guide member (static blade support portion) 160, and an impeller housing 180.
- An exhaust induction member 160 is attached to the upper side (+ Z side) of the motor 110.
- the impeller housing 180 is attached to the upper side of the exhaust guide member 160.
- the impeller 70 is accommodated between the exhaust guide member 160 and the impeller housing 180.
- the impeller 70 is attached to the motor 110 so as to be rotatable around the central axis J.
- FIG. 14 is a perspective view of the motor of this modification as viewed from below.
- the motor 110 includes a housing 120, a lower lid 122, a rotor 30 having a shaft 31, a stator 40, a circuit board 50, and a lower bearing 52a and an upper bearing 52b.
- the housing 120 is a covered cylindrical container that accommodates the rotor 30 and the stator 40.
- the housing 120 surrounds the stator 40 from the outside in the radial direction.
- the housing 120 includes a cylindrical peripheral wall 121, an upper cover part 123 positioned at the upper end of the peripheral wall 121, and an upper bearing holding part 127 positioned at the center of the upper cover part 123.
- the stator 40 is fixed to the inner surface of the housing 120.
- the upper bearing holding portion 127 has a cylindrical shape that protrudes upward from the center portion of the upper lid portion 123.
- the upper bearing holding portion 127 holds the upper bearing 52b inside.
- a plurality of through holes 125 and 126 are provided in the edge portion 121 a between the peripheral wall 121 and the upper lid portion 123 of the housing 120.
- the three through holes 125 and the three through holes 126 are alternately positioned around the axis (see FIG. 6).
- the through holes 125 and 126 reach the outer edge portion of the upper lid portion 123 from the upper side of the peripheral wall 121.
- the through holes 125 and 126 penetrate the peripheral wall 121 in the radial direction. Further, the through holes 125 and 126 penetrate in the vertical direction in the vicinity of the radially outer edge portion of the upper lid portion 123.
- a lower lid 122 is attached to an opening on the lower side ( ⁇ Z side) of the housing 120.
- a cylindrical lower bearing holding portion 122 c that protrudes downward from the lower surface of the lower lid 122 is provided at the center of the lower lid 122.
- the lower bearing holding portion 122c holds the lower bearing 52a.
- the lower lid 122 is provided with arc-shaped through holes 122a having a radial width at three locations around the axis.
- the lower lid 122 At the outer peripheral end of the lower lid 122, there are provided three notches 122b obtained by notching the outer peripheral portion of the lower lid 122 in a straight line.
- a gap between the lower opening end 120 a of the housing 120 and the notch 122 b is a lower opening 124 of the motor 110.
- FIG. 15 is a partial cross-sectional perspective view of the exhaust guide member 160 as viewed from below.
- FIG. 16 is a cross-sectional view showing a part of the impeller 70, the exhaust guide member 160, and the impeller housing 180 in an enlarged manner.
- the exhaust induction member (stator blade support) 160 is attached to the motor 110.
- the exhaust guide member 160 includes a disk ring-shaped support 166a, a cylindrical partition ring (first ring) 166b extending downward from the outer peripheral edge of the support 166a, and a plurality (six in the drawing) of upper guides.
- the plurality of upper guide portions 164 connect the outer peripheral surface of the partition ring 166b and the inner peripheral surface of the outer cylindrical portion 165 in the radial direction. That is, the upper guiding portion 164, the partition ring 166b, and the outer peripheral cylindrical portion 165 constitute an exhaust guiding member 160 that is a single member.
- the exhaust guide member 160 corresponds to the “static blade support portion”
- the partition ring 166b corresponds to the “first ring”
- the upper guide portion 164 corresponds to the “static blade”.
- the outer peripheral cylindrical portion 165 corresponds to a “second ring”.
- the support body 166a includes a cylindrical mounting ring 168 extending downward from the lower surface of the central portion, and three columnar convex portions 169 protruding downward from the lower surface of the support body 166a.
- the three cylindrical convex portions 169 have the same diameter and height, and are arranged at equal intervals of 120 ° in the circumferential direction.
- the cylindrical convex portion 169 is hollow, and has a through hole 169b penetrating in the axial direction at the center of the lower end surface 169a.
- the exhaust induction member 160 is attached to the housing 120 of the motor 110. As shown in FIG. 16, the upper bearing holding portion 127 of the housing 120 is inserted into the mounting ring 168 of the exhaust guide member 160. The lower surface of the attachment ring 168 of the exhaust guide member 160 and the lower end surface 169 a of the cylindrical convex portion 169 are in contact with the upper surface of the upper lid portion 123 of the housing 120. The exhaust induction member 160 and the motor 110 are fastened by a bolt BT inserted through the through hole 169b of the cylindrical convex portion 169 and the screw hole 123a of the upper lid portion 123.
- each upper guide portion 164 has a triangular shape in which the upper surface 164 a is inclined when viewed from the radial direction.
- the upper surface 164a is inclined downward along the rotation direction of the impeller.
- Between the adjacent upper guide portions 164 there are provided upper and lower through holes 162 penetrating in the vertical direction.
- the upper and lower through-holes 162 are provided in the same number (three in the drawing) as the upper guiding portion 164.
- the upper guiding portion 164 efficiently guides the exhaust gas flowing in the direction inclined in the rotation direction of the impeller 70 to the upper and lower through holes 162 along the inclination of the upper surface 164a.
- the plurality of lower guide portions 167 are positioned below the upper and lower through holes 162, respectively.
- the lower guide portion 167 protrudes radially inward from the inner peripheral surface of the outer peripheral cylindrical portion 165.
- the lower guide portion 167 is fitted into the through holes 125 and 126 of the housing 120.
- the lower guide portion 167 has a gradually increasing height inward in the radial direction from the upper side to the lower side.
- the lower guiding portion 167 has an inclined surface 167a that gradually inwardly inward in the radial direction toward the lower side.
- the inclined surface 167a guides the exhaust gas flowing through the upper and lower through holes 162 to the inside of the motor 110 through the through holes 125 and 126 on the radially inner side.
- the exhaust guide member 160 can be produced by molding.
- the exhaust guide member 160 is made of a resin material, the exhaust guide member 160 is manufactured by, for example, injection molding.
- the lower guide portion 167 of the exhaust guide member 160 is located immediately below the upper and lower through holes 162.
- the inclined surface 167 a of the lower guiding portion 167 faces the upper side through the upper and lower through holes 162.
- the exhaust guide member 160 is disposed at a position where all surfaces facing the upper side can be seen from the upper side. That is, the exhaust guide member 160 has all the surfaces facing the upper side provided at different positions as viewed from the upper side. Similarly, all the surfaces facing the lower side are provided at different positions as viewed from the lower side.
- the exhaust induction member 160 can be molded by a pair of upper and lower molds (upper mold and lower mold). More specifically, the exhaust guide member 160 can be formed by forming a surface facing the upper side with an upper mold, and forming a surface facing the lower side with a lower mold. It can be manufactured inexpensively without using it.
- the surface facing the upper side means a surface whose normal vector has a vector element in the + Z direction.
- the surface facing downward means a surface whose normal vector has a vector element in the ⁇ Z direction. Therefore, the surface facing diagonally upward is a surface facing the upper side in the axial direction, and the surface facing diagonally downward is the surface facing the lower side in the axial direction.
- the parting line PL of the exhaust guiding member 160 is provided along the lower surface of the upper guiding portion 164 from the upper end of the inclined surface 167 a of the lower guiding portion 167.
- the impeller 70 discharges the fluid sucked from the intake port 70a opened on the upper side toward the outside in the radial direction through the internal flow path.
- the impeller 70 includes an impeller body 71 and an impeller hub 72.
- the impeller 70 is fixed to the shaft 31 by fitting the upper end portion of the shaft 31 into the cylindrical portion 72a of the impeller hub 72 from below. As shown in FIGS. 12 and 16, the impeller 70 connected to the shaft 31 is disposed inside the annular protrusion 166 c of the exhaust guide member 160. Accordingly, the protruding portion 166 c is located in the vicinity of the exhaust port 70 c of the impeller 70.
- the protrusion 166c guides the exhaust discharged from the impeller 70 downward together with the exhaust guide 183 of the impeller housing 180 described later.
- the outer peripheral surface of the protrusion 166c is an inclined surface that is inclined downward as it goes radially outward.
- the outer peripheral surface of the protruding portion 166c has a smooth curved surface that is convex outward.
- the lower end of the outer peripheral surface of the protrusion 166c is smoothly continuous with the outer peripheral surface of the cylindrical partition ring 166b. Therefore, the inclination angle of the lower end of the protruding portion 166c with respect to the horizontal direction is approximately 90 °.
- the upper end of the protruding portion 166 c is located immediately outside the outer peripheral end of the base portion 73 of the impeller 70 in the radial direction.
- the upper end of the protruding portion 166 c is located above the lower surface of the base portion 73, and is located below the upper surface of the outer peripheral end of the base portion 73.
- the protrusion 166c has the shape and arrangement described above, so that the air discharged from the impeller 70 can be smoothly guided downward without disturbing the flow.
- air is discharged from the outer peripheral end of the base portion 73 in a substantially horizontal direction.
- the released air is guided along the outer peripheral surface of the protruding portion 166c without colliding with the protruding portion 166c. The Thereby, air can be conveyed efficiently.
- the impeller housing 180 has an intake port 180a on the upper side, and has a cylindrical shape tapered toward the upper side in the axial direction.
- the impeller housing 180 has a skirt shape from the outer peripheral edge of the impeller housing main body 182 to the radially outer side and the lower side, the intake guide 181 positioned at the opening end of the intake port 180a, the impeller housing main body 182 that houses the impeller 70.
- an outer peripheral mounting ring 184 extending upward from the outer peripheral edge of the exhaust guide portion 183.
- the impeller housing main body 182 covers the upper side of the impeller 70.
- the impeller housing body 182 has a cross-sectional shape that follows the shroud 75 of the impeller 70.
- the inner surface (lower surface) of the impeller housing body 182 faces the outer surface (upper surface) of the shroud 75 at a uniform interval.
- An annular intake guide portion 181 that protrudes inward in the radial direction is located at the inner peripheral upper end portion of the impeller housing body portion 182. As illustrated in FIG. 16, the intake guide portion 181 covers the upper end surface 75 b of the shroud 75 from the upper side. A narrow gap extending in the radial direction exists between the lower surface of the intake guide portion 181 and the upper end surface 75 b of the shroud 75.
- the outer peripheral end of the impeller housing main body 182 is provided with a peripheral bent portion 182a that is bent around the outer peripheral end of the shroud 75.
- the peripheral bent portion 182a extends downward and surrounds the outer end surface of the shroud 75 from the radially outer side.
- a narrow gap extending upward in the axial direction exists between the inner peripheral surface of the peripheral bent portion 182a and the outer end surface of the shroud 75.
- the exhaust guide portion 183 extends radially outward and downward from the outer peripheral edge of the impeller housing body portion 182. As shown in FIG. 12, the exhaust guide portion 183 constitutes an exhaust flow path 192 that guides the exhaust discharged radially outward from the impeller 70 downward.
- the inner peripheral surface of the exhaust guide portion 183 is smoothly inclined from the horizontal direction to the vertical direction from the upper end to the lower end.
- the inner peripheral surface of the exhaust guide portion 183 is gently connected to the inner peripheral surface of the outer peripheral cylindrical portion 165 of the exhaust guide member 160 at the lower end, and constitutes a wall surface on the outer peripheral side of the exhaust passage 192.
- the outer peripheral mounting ring 184 extends upward from the outer peripheral edge of the exhaust guide portion 183 and is fixed to the outer peripheral cylindrical portion 165.
- the outer peripheral mounting ring 184 has a cylindrical shape.
- the outer peripheral mounting ring 184 has a flange portion 184a extending radially outward from the upper end.
- the outer peripheral surface of the outer peripheral mounting ring 184 is fitted with the inner peripheral surface of the outer peripheral cylindrical portion 165 of the exhaust guide member 160. Further, the flange portion 184 a comes into contact with the upper end of the outer peripheral cylindrical portion 165 and determines the position of the impeller housing 180 in the vertical direction with respect to the exhaust guide member 160.
- a concave portion 186 extending in the circumferential direction is provided on the upper surface of the exhaust guide portion 183.
- the concave portion 186 is located above the exhaust guide portion 183.
- the recess 186 is recessed downward.
- the recess 186 includes a peripheral bent portion 182a, an exhaust guide portion 183, and an outer peripheral attachment ring 184.
- the impeller housing 180 is provided with a recess 186 so that the thickness of the exhaust guide portion 183 is uniform. Further, the recess 186 is provided with a rib 185 that connects the outer peripheral mounting ring 184 and the peripheral bent portion 182a of the impeller housing main body 182 in the radial direction.
- the impeller housing 180 is produced by molding.
- the impeller housing 180 is manufactured by injecting and solidifying a fluidized material into a gap between two or more molds.
- the impeller housing 180 of this modification is made of a resin material and is manufactured by injection molding.
- the impeller housing 180 is manufactured by aluminum die casting. Molded products manufactured by mold molding may cause sinking on the surface of the thick wall portion due to shrinkage when the material is solidified, which may reduce dimensional accuracy. Further, when aluminum die casting is performed, there is a risk that pores (nests) are formed inside the thick portion and the strength is lowered.
- a recess 186 is provided between the outer peripheral mounting ring 184 and the peripheral bent portion 182a of the impeller housing body 182.
- the impeller housing 180 can suppress the occurrence of sink marks around the exhaust guide portion 183 by making the thickness of the exhaust guide portion 183 uniform.
- the impeller housing 180 can suppress the formation of pores in the exhaust guide portion 183.
- the impeller housing 180 of this modification can increase the rigidity of the outer peripheral mounting ring 184 with respect to the impeller housing body 182 by providing the recess 186 with the rib 185. Thereby, the impeller housing 180 can be firmly fixed to the exhaust guide member 160 in the outer peripheral mounting ring 184.
- the air blower 101 of the present modification rotates the impeller 70 by the motor 110 to draw air into the impeller 70 from the air intake port 180 a, and the diameter of the air through the air flow path in the impeller 70. Release air outward in the direction.
- the exhaust discharged from the impeller 70 passes through the exhaust flow path 192 and flows into the exhaust guide member 160.
- the exhaust passage 192 is located between the inner peripheral surface of the exhaust guide portion 183 of the impeller housing 180 and the outer peripheral surface of the projecting portion 166c.
- the exhaust flow path 192 causes the exhaust discharged from the impeller 70 toward the radially outer side to flow downward and flow into the region of the upper guide portion 164.
- the upper guide part 164 smoothly guides the exhaust gas having the circumferential flow component discharged from the impeller 70 downward and guides it to the upper and lower through holes 162. Exhaust gas that has passed through the upper and lower through holes 162 flows downward along the inner peripheral surface of the outer peripheral cylindrical portion 165, is guided radially inward by the lower guide portion 167, and passes through the through holes 125 and 126 from the motor 110. Flows into the interior.
- the exhaust gas flowing into the motor 110 through the through hole 125 flows into the air flow path FP between the stator 40 and the housing 120 shown in FIG. In the air flow path FP, the exhaust gas flows downward.
- the outer peripheral surface of the straight portion 41c (stator core 41) is exposed and cooled by exhaust.
- a plurality of plate-like portions 45 are located in the air flow path FP and rectifies the exhaust gas flowing through the air flow path FP.
- the exhaust gas flowing through the air flow path FP is discharged downward from the lower opening 124 of the motor 110.
- Exhaust gas that has flowed into the motor 110 through the through hole 126 flows into the stator 40 through the gap CL as shown in FIG.
- the first side end surface 43b, the second side end surface 43c, and the inclined member 46 constituting the gap CL guide the exhaust gas passing through the gap CL to the side surface of the coil 42.
- the exhaust gas flows downward around the coil 42 and is discharged downward from the through hole 122a on the lower surface of the motor 110.
- the exhaust discharged radially outward from the impeller 70 can be smoothly guided to the inside of the motor 110 by the exhaust guide portion 183, the upper guide portion 164, and the lower guide portion 167.
- the air blower 101 can cool the motor 110 while maintaining high exhaust efficiency.
- the exhaust induction member 160 and the housing 120 are separate members separated vertically is illustrated.
- the exhaust guide member 160 and the housing 120 may be a single member.
- the coaxiality of the exhaust guide member 160 with respect to the motor 110 can be increased, and the exhaust flow path 192 can enhance symmetry with respect to the central axis J of the motor 110 and increase the stability of pressure in the flow path.
- the impeller 270 has an impeller body 271 and an impeller hub 272.
- the impeller body 271 includes a base portion 273, a plurality of moving blades 274, and a shroud 275. That is, the impeller 270 includes a base portion 273, a plurality of moving blades 274, and a shroud 275.
- the base portion 273 is located below the plurality of moving blades 274.
- the base part 273 has a disk shape.
- the shroud 275 is located radially inwardly toward the upper side above the rotor blade 274. That is, the shroud 275 has a tapered shape.
- the base part 273 and the shroud 275 are connected by a moving blade 274.
- the upper surface of the base portion 273 has a base portion inclined portion 273d that is inclined downward in the axial direction as going outward in the radial direction.
- a base portion inclined portion 273d By providing the base portion inclined portion 273d, air is released obliquely downward along the base portion inclined portion 273d at the lower end of the exhaust port 270c of the impeller 270.
- the air discharged from the impeller 270 is guided downward along the inner peripheral surface of the exhaust guide portion 183.
- the exhaust is discharged obliquely downward by the impeller 270, so that the direction of the exhaust can be changed more smoothly and the exhaust efficiency is increased.
- the protruding portion 166c located on the radially outer side of the base portion 273 can be reduced, and the diameter of the base portion 273 can be made larger than the diameter of the shroud 275. That is, the outer edge 273e of the base portion 273 can be positioned on the radially outer side from the outer edge 275c of the shroud 275. Therefore, it is possible to increase the diameter of the impeller 270 (particularly, the moving blade 274) without increasing the size of the shroud 275.
- a high-power blower can be configured even at low rotation. According to this modification, it is possible to provide a high-power blower with a small radial dimension and low rotation.
- FIG. 18 is a perspective view showing the overall configuration of the blower 301.
- the blower device 301 is provided with an impeller cover part (impeller housing) 314 and a main body cover part 302 on the outside thereof.
- the impeller cover part 314 is a metal cap-like member having an air inlet 312 formed at the center of the upper surface.
- the main body cover unit 302 includes an upper cover 318 and a lower cover 320.
- the upper cover 318 has a cylindrical portion in which the cylindrical portion of the impeller cover portion 314 is fitted from the outer peripheral side.
- the upper cover 318 is made of a resin molded product in which an upper flange portion 316 is integrally provided at the lower end of the cylindrical portion.
- the lower cover 320 has a lower cylindrical portion 324 in which exhaust ports 322 are formed at a plurality of positions on the outer periphery of the lower portion, and a lower flange portion 326 integrally provided at the upper end of the lower cylindrical portion 324, and is a resin molded product. It becomes more.
- the upper flange portion 316 and the lower flange portion 326 are joined to each other from above and below, and are coupled by screws 328, whereby the upper cover 318 and the lower cover 320 are connected. More specifically, the upper flange portion 316 has screw insertion holes at several places in the circumferential direction, and the lower flange portion 326 has screw holes at several places in the circumferential direction so as to face the holes.
- the screw 328 is formed and screwed into the screw hole through the screw insertion hole.
- FIG. 19 is a perspective view showing a state where the impeller cover portion 314 is removed from the air blower 301 of FIG. 20 is a plan view of the blower 301
- FIG. 21 is a longitudinal sectional view taken along the line AA passing through the center of the blower 301 in FIG. Parallel oblique lines are omitted for details of the cross section.
- the air blower 301 includes an impeller cover 314, an upper cover 318, a lower cover 320, and a bottom cover 330 attached to the lower cover 320 so as to cover the lower surface of the lower cover 320.
- a space is constructed.
- the blower 301 further includes an impeller 340 formed of a centrifugal impeller and a motor unit (motor) 350 having a central axis J facing the vertical direction in the internal space.
- the motor unit 350 corresponds to a “motor”.
- the impeller 340 is covered with an impeller cover portion 314.
- the impeller cover portion 314 includes a cylindrical outer peripheral portion that covers the outer periphery of the impeller 340 and an upper surface portion that covers the top of the outer peripheral edge portion of the impeller 340. That is, the impeller cover portion 314 has an inner surface that covers the outer periphery of the impeller 340 and the upper portion of the outer edge portion. Further, the impeller cover portion 314 has an intake port 312 in the center of the upper surface portion.
- the impeller 340 includes a plurality of moving blades 342 arranged on the upper surface of a substrate (base portion) 341 made of a circular flat plate in the circumferential direction, and an upper end of each moving blade 342 is formed by a conical curved shroud 343 having an opening at the center. It is the structure which connects.
- An upper end portion of a rotation shaft (shaft) 351 of the motor unit 350 is connected to the central portion of the substrate 341. Thereby, the impeller 340 is attached to the rotating part of the motor part 350.
- a central opening of the shroud 343 in the impeller 340 communicates with the intake port 312 of the impeller cover portion 314.
- the rotation shaft 351 corresponds to a “shaft”.
- the motor unit 350 is, for example, an inner rotor type brushless motor.
- the motor unit 350 includes an upper housing part (stator blade support part) 352 provided with guide blades (static blades) 370 and a lower housing part 353. And a motor element 354 including a stator portion.
- the rotor portion of the motor element 354 is supported by the rotation shaft 351, and the rotation shaft 351 is supported at the center portion of the upper housing portion 352 and the lower bearing (at the center portion of the bottom cover 330).
- Bearing) 356 is rotatably supported.
- the rotating shaft 351 rotates together with the rotor unit of the motor element 354, the impeller 340 connected to the rotating shaft 351 rotates, and in the vicinity of the rotating blades 342 on the impeller 340, Air is pushed radially outward. Accordingly, a negative pressure is generated on the inner peripheral side of each rotor blade 342, and external air is sucked from the intake port 312.
- the impeller 340 is rotated counterclockwise by the motor unit 350 in a plan view, for example. That is, the impeller 340 is positioned above the motor unit 350, connected to the rotating unit of the motor unit 350, and rotates to send gas from the upper side toward the radially outer side.
- the upper housing portion 352 corresponds to a “static blade support portion”
- the guide blade 370 corresponds to a “static blade”.
- the upper cover 318 and the lower cover 320 constitute a main body cover portion 302 that covers the outer periphery of the motor portion 350. That is, the main body cover unit 302 includes an upper cover 318 and a lower cover 320. The main body cover 302 is connected to the impeller cover 314 at the upper cover 318. The main body cover unit 302 covers the outer peripheral surface 350 a of the motor unit 350. A cylindrical space 360 is formed between the inner peripheral surface 302 a of the main body cover unit 302 and the outer peripheral surface 350 a of the motor unit 350. That is, the main body cover portion 302 forms a cylindrical space 360 between the main body cover portion 302 and the motor portion 350. The outer peripheral surface 350a of the motor unit 350 extends linearly along the vertical direction.
- the inner peripheral surface 302a of the main body cover portion 302 is curved to protrude radially inward along the vertical direction so as to be closest to the central axis J in the middle abdomen. That is, the radial distance between the inner peripheral surface 302a of the main body cover 302 and the central axis J changes continuously. Thereby, the cylindrical space 360 changes the radial clearance as it goes from the upper side to the lower side through the middle abdomen.
- the cylindrical space 360 serves as a flow path for the air discharged from the impeller 340.
- the air flow path is configured only on the radially outer side of the motor unit 350. Therefore, the air discharged from the impeller 340 does not flow inside the outer peripheral surface 350 a of the motor unit 350.
- the upper portion of the cylindrical space 360 communicates with the outer peripheral space of the impeller 340 in the impeller cover portion 314.
- the exhaust port 322 of the lower cover 320 faces the lower part of the cylindrical space 360.
- the inner peripheral surface of the upper cover 318 is formed into a curved surface whose diameter increases in a curved shape as it goes upward, and the inner peripheral surface of the lower cover 320 is a substantially cylindrical surface extending from the upper part to the middle part.
- the lower part is formed in a curved surface whose diameter increases slightly as it goes downward.
- the radial gap in the cylindrical space 360 is widest at the upper position, gradually narrows as it goes to the middle abdomen, and further gradually widens as it goes to the lower position from the middle abdomen.
- the position where the radial gap in the cylindrical space 360 becomes narrow corresponds to, for example, a boundary portion between a curved portion and a straight portion in a plurality of guide blades described later.
- the configuration of the cylindrical space 360 will be described more specifically.
- the cylindrical space 360 has an upper region 361 and a lower region 363 located below the upper region 361.
- the upper region 361 and the lower region 363 are arranged side by side in the vertical direction, and the lower region 363 is positioned below the upper region 361.
- the upper end of the cylindrical space 360 coincides with the upper end 361a of the upper region 361.
- the lower end of the cylindrical space 360 is coincident with the lower end 363 a of the lower region 363.
- the upper end of the cylindrical space 360 means a virtual surface located on the upper side in the axial direction of the cylindrical space 360, and is an opening on the upper side of the flow path.
- the lower end of the cylindrical space 360 means a virtual surface located on the lower side in the axial direction of the cylindrical space 360 and is an opening on the lower side of the flow path.
- the radial distance between the outer peripheral surface 350 a of the motor unit 350 and the inner peripheral surface 302 a of the main body cover unit 302 becomes shorter continuously toward the lower side in the upper region 361.
- the radial distance between the outer peripheral surface 350a of the motor unit 350 and the inner peripheral surface 302a of the main body cover unit 302 becomes continuously longer toward the lower side.
- the cylindrical space 360 has the upper region 361 and the lower region 363 described above, so that the radial gap of the cylindrical space 360 is narrowest at the boundary portion 362 between the upper region 361 and the lower region 363.
- the air that has flowed into the cylindrical space 360 flows into the lower region 363 after the flow resistance increases in the upper region 361 and is narrowed down.
- the radial gap gradually increases.
- the pressure of the air is gradually released, the flow gradually becomes gentle, the air is discharged without causing separation, and the blowing efficiency is improved.
- such a cylindrical space 360 can contribute to noise reduction by improving the blowing efficiency.
- the upper region 361 and the lower region 363 are adjacent in the vertical direction. That is, the lower end of the upper region 361 coincides with the upper end of the lower region 363 and forms the boundary portion 362.
- an intermediate region may be provided between the upper region 361 and the lower region 363. In this case, it is preferable that the radial distance between the motor unit 350 and the main body cover unit 302 is constant in the intermediate region.
- the radial distance between the outer peripheral surface 350a of the motor unit 350 and the inner peripheral surface 302a of the main body cover 302 at the upper end 361a of the upper region 361 is preferably longer than the radial distance at the lower end 363a of the lower region 363. That is, in the cylindrical space 360, it is preferable that the upper end 361a of the upper region 361 is a position where the radial gap is the longest. In the exhaust gas that passes through the upper end 361a of the upper region 361, there may be a case where a component facing radially outward remains.
- the radial distance between the motor portion 350 and the main body cover portion 302 is preferably set such that the upper end 361a is longer than the lower end 363a.
- the main body cover unit 302 includes an upper cover 318 and a lower cover 320 that are divided in the vertical direction.
- a boundary between the upper cover 318 and the lower cover 320 coincides with a boundary portion 362 located between the upper region 361 and the lower region 363. That is, the main body cover portion 302 is divided into upper and lower portions at a portion where the radial distance between the outer peripheral surface 350a of the motor portion 350 and the inner peripheral surface 302a of the main body cover portion 302 is the smallest in the cylindrical space 360. Therefore, the inner diameter of the upper cover 318 gradually increases from the lower end position toward the upper side on the inner peripheral surface 302a. For this reason, the upper cover 318 can be easily formed by a mold.
- the inner diameter of the lower cover 320 gradually increases from the upper end position toward the lower side, and can be easily formed by a mold.
- the main body cover portion 302 has a structure in which the main body cover portion 302 is divided in the vertical direction at the boundary portion 362. Therefore, the manufacturing is easy and the cost can be reduced.
- the main body cover 302 has 302 members (upper cover 318 and lower cover 320) divided in the vertical direction, but may be a single member.
- FIG. 24 shows a cross-sectional view of an air blower 301A having a main body cover 302A that is a single member.
- the main body cover portion 302 ⁇ / b> A is configured by one member that is continuous along the vertical direction on the inner peripheral surface 302 a that forms the cylindrical space 360. Therefore, the inner peripheral surface 302a becomes one continuous surface. For this reason, since the joint of members is not exposed to the flow path of the airflow passing through the cylindrical space 360, the separation of air is suppressed and the blowing efficiency can be improved.
- the main body cover portion 302A which is a single member, is formed by a pair of molds having a vertical direction as a pulling direction by a parting line along the boundary portion 362.
- a plurality of guide blades 370 are arranged at equal intervals in the circumferential direction. Thereby, separation of the airflow does not occur, and the airflow can be efficiently guided along the surface of the guide blade 370.
- the plurality of guide blades 370 are integrally formed with the upper housing portion 352, and each guide blade 370 has a curved portion (upper guide blade) 371 located on the upper side and a lower portion in the axial direction continuous to the curved portion. And a linear portion (lower guide wing) 372 extending in the direction of the angle.
- each of the plurality of guide blades 370 has a guide blade upper portion and a guide blade lower portion.
- the upper portion of the guide blade is inclined more than the straight portion 372 with respect to the axial direction.
- the curved portion 371 of each guide blade 370 is curved so as to go in the opposite direction to the rotation direction of the impeller 340 as it goes upward. That is, the rotation of the impeller 340 generates an air flow that swirls in the same direction as the rotation direction of the impeller 340, but the curved shape of the bending portion 371 is formed so that the air flow can be smoothly taken in and guided downward.
- an air flow path for guiding the swirling air sent from the impeller 340 downward is configured.
- FIG. 22 shows a case where the impeller cover portion 314 and the main body cover portion 302 are cut along the line BB in the blower device 301 in FIG. 20, and FIG. This is an enlarged view of the guide wing 370 of the part.
- two curved surfaces 371x1 and 371x2 having different curvature radii are formed continuously on the downstream side in the rotation direction of the impeller 340 in the curved portion 371 of the guide blade 370, and the curvature radius of the upper curved surface 371x1 is formed.
- Rx1 is larger than the radius of curvature Rx2 of the lower curved surface 371x2 (Rx1> Rx2).
- a curved surface 371y1 having a radius of curvature Ry1 smaller than the curved surface 371x1 is formed on the upstream side in the rotation direction of the impeller 340 in the curved portion 371 of the guide blade 370 (Rx1> Ry1).
- the center x1 of the curved surface 371x1 and the center y1 of the curved surface 371y1 are located on the upstream side in the rotation direction of the impeller 340 with respect to the center x1 of the curved surface 371x1.
- a plane 372x1 continuous with the curved surface 371x2 and an inclined surface 372x2 that inclines toward the upstream side in the rotational direction as it goes downward are formed on the downstream side in the rotational direction of the impeller 340.
- a flat surface 372y1 continuous with the curved surface 371y1 and an inclined surface 372y2 that inclines toward the downstream side in the rotation direction downward toward the lower side are formed.
- Each of the plurality of guide blades 370 is arranged so as to partially overlap the adjacent guide blades 370 in the axial direction. That is, as shown in FIG. 22, the distal end portion of the curved portion 371 of any guide blade 370 overlaps the curved portion 371 and the straight portion 372 of the guide blade 370 adjacent to the upstream side in the rotation direction of the impeller 340 in the axial direction. Yes. By comprising in this way, the air sent from the impeller 340 can be taken in more efficiently, and can be guided as a downward flow.
- the lower end 370b of the guide blade 370 is located on the downstream side in the rotation direction of the impeller 340 with respect to the upper end 370a of the guide blade 370. Accordingly, the guide blade 370 can smoothly guide the wind flowing along the rotation direction of the impeller 340 to the lower side in the axial direction, and can improve the blowing efficiency.
- the circumferential position between the upper end 370a and the lower end 370b at the radially outer end of the guide blade 370 Should be compared.
- the lower end 370b is located downstream of the upper end 370a in the rotation direction of the impeller 340.
- the guide blade 370 when viewed from the upper side in the axial direction, the guide blade 370 is inclined with respect to the radial direction, or when viewed from the radial direction, the upper surface of the guide blade 370 is in a direction perpendicular to the axial direction. Even in the case of tilting, the circumferential positions of the upper end 370a and the lower end 370b may be compared at the radially outer end of the guide blade 370.
- the axial position of the upper end 370a of the guide wing 370 matches the axial position of the upper end of the motor unit 350.
- the upper end of the motor unit 350 coincides with the upper end of the cylindrical space 360 (that is, the upper end 361a of the upper region 361).
- the upper end 361a of the upper region 361 is a position where the radial gap is the widest in the cylindrical space 360.
- the plurality of guide blades 370 arranged at equal intervals in the circumferential direction in the cylindrical space 360 have guide blades 370 whose dimensions are perpendicular to the gas inflow direction in the air flow path between the guide blades 370. Is narrowest at the tip of the curved portion 371 and widest at the lower end of the straight portion 372 of the guide blade 370.
- the impeller 340 rotates, and external air is taken in from the intake port 312 of the impeller cover unit 314, and this air is radial from the impeller 340. It is discharged outward as a swirl flow and guided to the inner surface of the cylindrical outer peripheral portion of the impeller cover portion 314. Further, the air flow discharged from the impeller 340 is guided to the cylindrical space 360, and the swirling flow is guided to the axial flow by passing through the gaps between the plurality of guide blades 370.
- each guide blade 370 can effectively take the swirl flow from the impeller 340 between the guide blades 370 by the curved portion 371 provided at the upper portion. Further, the thickness of the curved portion 371 is changed along the air flow direction, that is, the 32 curved surfaces 371x1 and 371x2 having different curvature radii on the downstream side in the rotational direction of the guide blade 370 and the upstream in the rotational direction of the curved portion 371.
- separation of the air flow can be reduced, and the guide blade 370 can be guided efficiently along the surface.
- the curvature radii Rx1 and Rx2 of the two curved surfaces 371x1 and 371x2 on the downstream side in the rotation direction of the bending portion 371 satisfy the relationship of Rx1> Rx2, and the curvature radius Ry1 of the curved surface 371y1 on the upstream side in the rotation direction of the bending portion 371.
- Rx1> Ry1 the flow in the cylindrical space 360 is improved, and the efficiency is greatly improved.
- the boundary between the curved portion 371 and the straight portion 372 is a portion where the radial distance between the outer peripheral surface 350a of the motor portion 350 and the inner peripheral surface 302a of the main body cover portion 302 in the cylindrical space 360 is the narrowest (in this modification, the boundary Part 362). Since the radial gap of the cylindrical space 360 is shortest in the vicinity of the boundary between the curved portion 371 and the straight portion 372 in each guide blade 370, the air flowing into the cylindrical space 360 is the boundary between the curved portion 371 and the straight portion 372. After the flow resistance in the vicinity is increased and narrowed down, the radial gap gradually increases as it goes downward along the straight portion 372, so that the pressure is released and the air flow becomes gentle. Air is discharged without causing air separation. In particular, since the gap between the guide blades 370 gradually widens at the lower part of the straight portion 372, the above-described action is promoted.
- the upper housing part 352 which comprises the cylindrical space 360 has the cylindrical 1st ring 352a.
- the main body cover part 302 which comprises the cylindrical space 360 has the cylindrical 2nd ring 302b. That is, a cylindrical cylindrical space 360 is formed between the first ring 352a and the second ring 302b.
- the radial distance between the outer peripheral surface of the first ring 352a and the inner peripheral surface of the second ring 302b continuously decreases toward the lower side in the upper region 361 and decreases downward in the lower region 363. As it becomes continuously longer. Thereby, in the cylindrical space 360, air is compressed and a static pressure becomes high, it is reduced that a wind peels from the inner wall of a flow path, and ventilation efficiency improves.
- the first ring 352a is located on the radially inner side of the guide blade 370.
- the second ring 302 b is located on the radially outer side of the guide blade 370.
- the first ring 352 a is a single member with the upper housing portion ⁇ housing> 352. Thereby, the coaxiality with respect to the central axis J of the 1st ring 352a increases, and the stability of the pressure of the flow path located in the outer side of the 1st ring 352a can be improved.
- the first ring 352a may be a single member for both the upper housing part 352 and the lower housing part 353. In this case, the first ring 352a can further increase the coaxiality with respect to the central axis J, and can further stabilize the pressure.
- first ring 352a and the second ring 302b are separate from each other.
- first ring 352a and the second ring 302b may be a single member together with the guide blade 370.
- the coaxiality of the cylindrical space 360 with respect to the motor part 350 can be increased, and the flow path can improve the symmetry with respect to the central axis J of the motor part 350 and can increase the stability of the pressure in the flow path.
- the guide blade 370 corresponds to a “static blade”.
- the straight portion 372 extends in the axially downward direction, but not limited to this, the straight portion 372 is bent in the bending direction of the bending portion 371.
- the guide blade 370 may be configured to extend downward with an angle that is inclined to the angle, and even if the entire length of the curved portion 371 is shortened, the same action as described above can be obtained.
- the overall length of the wing 370 can be shortened to make the entire apparatus compact.
- the main body cover unit 402 covers the outer peripheral surface 450a of the motor unit 450.
- the main body cover portion 402 is connected to the impeller cover portion 314 at the upper end.
- An inner peripheral surface 402a of the main body cover portion 402 extends linearly along the vertical direction.
- the radial distance between the outer peripheral surface 450a of the motor unit 450 and the inner peripheral surface 402a of the main body cover unit 402 (that is, the radial gap in the cylindrical space 460) is continuous toward the lower side. Become longer.
- the radial distance between the outer peripheral surface 450 a of the motor unit 450 and the inner peripheral surface 402 a of the main body cover unit 402 at the upper end 461 a of the upper region 461 is longer than the radial distance at the lower end 463 a of the lower region 463.
- the air blower 401 according to the present modification has the same effect as the air blower 301 by being provided with a cylindrical space 460 having an upper region 461 and a lower region 463 similar to those of the air blower 301 according to the third modification. be able to. That is, it is possible to increase the air blowing efficiency and to further reduce the noise.
- first ring 452a and the second ring 402b may be a single member together with the guide blade 470.
- the coaxiality of the cylindrical space 460 with respect to the motor unit 450 can be increased, and the flow path can improve the symmetry with respect to the central axis J of the motor unit 450, and the stability of the pressure in the flow path can be increased. .
- the motor housing 457 is vertically divided at a portion (a boundary portion 462 in the present embodiment) where the radial distance between the outer peripheral surface 450a of the motor portion 450 and the inner peripheral surface 402a of the main body cover portion 402 in the cylindrical space 460 is the narrowest. Has been. Therefore, the outer diameter of the upper housing portion 452 gradually decreases from the lower end position toward the upper side on the outer peripheral surface 450a. For this reason, the upper housing part 452 can be easily molded by a mold. Similarly, the outer diameter of the lower housing portion 453 gradually decreases from the upper end position toward the lower side, and can be easily formed by a mold.
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Abstract
Description
図1及び図2に示すように、送風装置1は、モータ10と、インペラ70と、インペラハウジング80と、複数の静翼と、第1リング66bと、第2リング65と、を備える。複数の静翼は、後述する上部静翼67aと、下部静翼67bと、を有する。
モータ10の上側(+Z側)に、静翼部材60が取り付けられる。インペラハウジング80は静翼部材60の上側に取り付けられる。静翼部材60とインペラハウジング80との間にインペラ70が収容される。インペラ70は、中心軸J周りに回転可能にモータ10に取り付けられる。
図3は、本実施形態のモータを下側から見た斜視図である。
モータ10は、図1に示すように、ハウジング20と、下蓋22と、シャフト31を有するロータ30と、ステータ40と、回路基板50と、下側ベアリング52a及び上側ベアリング52bと、を備える。すなわち、モータ10は、ハウジング20をさらに有する。より詳細に述べると、モータ10は、上下方向に延びる中心軸Jに沿って配置されるシャフト31とシャフト31を回転可能に支持するベアリング52a,52bとを有する。
ステータ40は、ロータ30の径方向外側に位置する。ステータ40は、ロータ30を軸周り(θz方向)に囲んでいる。ステータ40は、図4及び図5に示すように、ステータコア41と、複数(3つ)の上側インシュレータ43と、複数(3つ)の下側インシュレータ44と、コイル42と、を有する。
回転センサ51は、図6及び図7に示すように、周方向に隣り合う下側内周壁部44cの先端部の間に挟まれて配置される。3つの回転センサ51は、周方向に120°おきの等間隔に配置される。回転センサ51の径方向内側の面は、ロータマグネット33と対向する。本実施形態の場合、ロータマグネット33は、ロータ30の軸方向の中心部に配置されている。そのため、回転センサ51は、回路基板50からロータマグネット33までの軸方向長さに相当する長さのリード51aにより回路基板50と接続される。3つの回転センサ51が、周方向に隣り合う下側内周壁部44cの先端部の間に挟まれて配置されることによって、例えば、下側磁石固定部材32の下にセンサマグネットを配置し、センサマグネットの下にさらに回転センサ51を配置する構造に比べて、モータ10の軸方向長さを短くすることができる。
次に、静翼部材、インペラ、インペラハウジングについて説明する。
図8は、静翼部材を下側から見た斜視図である。図9は、インペラ70、第1静翼部材61a、第2静翼部材61b、インペラハウジング80の一部を拡大して示す断面図である。
静翼部材60は、図1及び図2に示すように、第1静翼部材61aと、第2静翼部材(静翼支持部)61bとを有する。第1静翼部材61aと第2静翼部材61bは軸方向に積層されてモータ10の上面に取り付けられる。
送風装置1は、下部静翼支持リング62をさらに備える。第1静翼部材61aは、下部静翼支持リング(第3リング)62と、取付リング63と、3つの連結部64と、複数の下部静翼67bと、を有する。下部静翼支持リング62と取付リング63は同軸に配置され、径方向に延びる3つの連結部64により連結されている。3つの連結部64は周方向に120°おきの等間隔に配置される。連結部64は、軸方向に貫通する貫通孔64aを有する。3つの貫通孔64aは、周方向において120°おきの等間隔に配置される。取付リング63は、上面に取付リング63と同心の凹溝63aを有する。
なお、本実施形態においては、第2静翼部材61bは、「静翼支持部」に対応する。また、下部静翼支持リング62は、「第3リング」に対応する。
複数の下部静翼67bは、下部静翼支持リング62の外周面から径方向外側に突出する。すなわち、下部静翼支持リング62は、上部静翼67aの下側に位置する下部静翼67bをさらに有する。これにより、複数の下部静翼67bの間を流れる排気において、乱流が発生することを低減することができ、流路内の送風効率を向上させることができる。複数の下部静翼67bは、周方向に等間隔に配置される。下部静翼支持リング62の外周面は、上側に向かって先窄まりのテーパー状である。下部静翼67bは、上側に向かうに従って径方向の幅が大きくなる形状を有する。複数の静翼(上部静翼67aおよび下部静翼67b)は、インペラハウジング80の下側に位置する。
上部静翼支持リング66bおよび外周リング65は、略円筒形状であってもよい。略円筒形状とは、円筒形状に準ずる形状であって、例えば、内周面及び外周面に凹凸がある場合および横断面が楕円形状を有する場合などを含む。
上部静翼支持リング66bは、上部静翼67aの径方向内側に位置する。図9に示すように、上部静翼支持リング66bは、下端部の外周側に一周にわたって延びる段差部66dを有する。
外周リング65は、上部静翼67aの径方向外側に位置する。図9に示すように、外周リング65は、上端部の外周側に一周に亘って延びる段差部65aを有する。
複数の上部静翼67aは、インペラハウジング80の下側に位置する。また、複数の上部静翼67aは、径方向において、上部静翼支持リング66bの外周面と外周リング65の内周面とを連結する。すなわち、上部静翼67a、上部静翼支持リング66bおよび外周リング65は、単一の部材であり、第2静翼部材61bを構成する。これにより、モータ10と、第2静翼部材61bと、外周リング65と、の同軸度を高めることができる。さらに、第2静翼部材61bにおいて上部静翼支持リング66bの径方向外側に設けられた流路が、モータ10の中心軸Jに対して対称となり、流路内の圧力の安定性を高めることができる。
なお、本実施形態においては、上部静翼支持リング66bは、「第1リング」に対応し、外周リング65は、「第2リング」に対応する。
なお、本実施形態においては、円柱凸部69は、「第2固定部」に対応する。すなわち、第2静翼部材61bは、円柱凸部(第2固定部)69を有する。
本実施形態では、静翼部材60を2つの部材(第1静翼部材61a、第2静翼部材61b)で構成する一方、モータ10の金属のハウジング20との締結を第2静翼部材61bのみとしている。また、第2静翼部材61bは、第1静翼部材61aを固定する第2固定部(円柱凸部)69と、第1固定部(取付リング68及び上部静翼支持リング66b)とは異なる位置においてハウジング20に固定されている。すなわち、第2静翼部材61bは、第1固定部とは異なる位置においてハウジング20に固定される円柱凸部69を有する。このような固定形態を用いることで、送風装置1の温度が変化したときに、モータ10と静翼部材60との間の締結状態に不具合が生じるのを抑制することができる。
図10に示すように、上部静翼67aと下部静翼67bは、周方向に同じ数だけ配置される。上部静翼67aと下部静翼67bは、一対一に対応し、軸方向に並んで配置される。本実施形態の場合、上部静翼67aの軸方向に対する傾斜角度は、下部静翼67bの軸方向に対する傾斜角度よりも大きい。上部静翼67aは、インペラ70の回転方向に傾いた方向に流れる排気を、効率よく上部静翼67aの間に流入させるために比較的大きな角度で傾斜して配置される。下部静翼67bは、排気口95から放出される排気が径方向外側へ流れないように、排気を下方へ向けて案内する。
インペラ70は、シャフト31の上端側に連結されている。インペラ70は、上側に開口した吸気口70aから吸入された流体を、内部の流路を介して径方向外側へ向かって放出する。インペラ70は、インペラ本体71と、インペラハブ72とを有する。
複数の動翼74は、図11に示すように、ベース部73の上面に周方向(θZ方向)に沿って配置されている。動翼74は、図1に示すように、ベース部73の上面から、軸方向に沿って垂直に起立している。
第1の動翼74aは、曲率半径の異なる4つの円弧からなる。第1の動翼74aの凸状の翼面74dは、長さ方向に3つの変曲点CP11、CP12、CP13を有する。
第2の動翼74bは、曲率半径の異なる3つの円弧からなる。第2の動翼74bの凸状の翼面74eは、長さ方向に2つの変曲点CP21、CP22を有する。
第3の動翼74cは、曲率半径の異なる2つの円弧からなる。第3の動翼74cの凸状の翼面74fは、長さ方向に1つの変曲点CP31を有する。
インペラハウジング80は、インペラ70を収容し、上側に吸気口80aを有する。インペラハウジング80は、軸方向上側へ向かって先窄まりの円筒状である。インペラハウジング80は、吸気口80aの開口端に位置する吸気ガイド部81を有する。インペラハウジング80は、インペラ70の上側を覆うインペラハウジング本体部82と、インペラハウジング本体部82の外周縁から径方向外側および下側に延びる排気ガイド部83と、排気ガイド部83の外周縁から上側に延びて外周リング65と固定される外周取付リングと、を有する。
本実施形態の送風装置1は、モータ10によりインペラ70を回転させることで、図1に示すように、吸気口80aからインペラ70内に空気を引き込み、インペラ70内の空気流路を介して径方向外側へ空気を放出する。インペラ70から放出された排気は、排気流路92を介して上部静翼67aの間に領域に流入する。上部静翼67aは排気を整流して下側へ放出する。下部静翼67bは排気の流通方向を下側へ向けながら、径方向外側へ案内する。その後、排気は排気口95から送風装置1の外へ排出される。
本実施形態によれば、上部静翼67a、上部静翼支持リング66bおよび外周リング65は、単一の部材である。ここで、単一の部材であるとは、連続した一体の部材であることを意味する。より具体的には、同一の製造工程により同時に成形されていることを意味し、例えば金型を用いた成形により、同時に形成されている場合が想定される。このような構造を有することで別部材から構成される場合と比較して、上部静翼支持リング66bの外周と外周リング65の内周の間に位置する径方向の隙間の幅を、周方向に沿って高精度で一定とすることができる。これにより、排気口95の流路断面積を周方向に沿って一定とすることが可能となり、周方向に沿う排気の圧力を安定させ、排気効率を高めることができる。
なお、排気口95は、ステータ40よりも上側に配置されていればよい。モータ10の能力と直径との関係はステータ40の大きさで決定されるため、排気口95が少なくともステータ40より上側に配置されていれば、モータ10の径方向外端よりも内側に排気口95を配置することができる。
図12は、変形例1の送風装置101を示す断面図である。図13は、本変形例の送風装置101の分解斜視図である。なお、上述の実施形態と同一態様の構成要素については、同一符号を付し、その説明を省略する。
送風装置101は、図12および図13に示すように、モータ110と、インペラ70と、排気誘導部材(静翼支持部)160と、インペラハウジング180と、を備える。
モータ110の上側(+Z側)に、排気誘導部材160が取り付けられる。インペラハウジング180は排気誘導部材160の上側に取り付けられる。排気誘導部材160とインペラハウジング180との間にインペラ70が収容される。インペラ70は、中心軸J周りに回転可能にモータ110に取り付けられる。
図14は、本変形例のモータを下側から見た斜視図である。
モータ110は、図12に示すように、ハウジング120と、下蓋122と、シャフト31を有するロータ30と、ステータ40と、回路基板50と、下側ベアリング52aおよび上側ベアリング52bと、を備える。
次に、排気誘導部材160、インペラ70、インペラハウジング180について説明する。
図15は、排気誘導部材160を下側から見た部分断面斜視図である。図16は、インペラ70、排気誘導部材160、インペラハウジング180の一部を拡大して示す断面図である。
なお、本実施形態においては、排気誘導部材160は、「静翼支持部」に対応し、隔壁リング166bは、「第1リング」に対応し、上側誘導部164は、「静翼」に対応し、外周筒部165は、「第2リング」に対応する。
3つの円柱凸部169は、同等の直径および高さを有し、周方向に120°おきの等間隔で配置される。本変形例において、円柱凸部169は中空であり、下側の端面169aの中央に、軸方向に貫通する貫通孔169bを有する。
ここで、上側を臨む面とは、法線ベクトルが+Z方向のベクトル要素を有している面を意味する。また、下側を向く面とは、法線ベクトルが-Z方向のベクトル要素を有している面を意味する。したがって、斜め上側を向く面は、軸方向上側を臨む面であり、斜め下側を向く面は、軸方向下側を臨む面である。
なお、図15に示すように排気誘導部材160のパーティングラインPLは、下側誘導部167の傾斜面167aの上端から上側誘導部164の下面に沿って設けられる。
インペラハウジング180は、金型成型により生産される。すなわち、インペラハウジング180は、2つ以上の金型同士の隙間に、流動状態の材料を注入し固化させて製造される。本変形例のインペラハウジング180は、樹脂材料からなり射出成型により作製される。また、インペラハウジング180をアルミニウム合金製とする場合には、インペラハウジング180は、アルミニウムダイカストにより作製される。金型成型により製造される成形品は、材料が固化する際の収縮により厚肉部の表面にひけを生じ寸法精度を低下させる虞がある。また、アルミニウムダイカストを行う場合には、厚肉部の内部に気孔(巣)が生じて強度を低下させる虞がある。
本変形例のインペラハウジング180は、外周取付リング184とインペラハウジング本体部182の周縁屈曲部182aとの間に凹部186が設けられている。これにより、インペラハウジング180は、排気ガイド部183の肉厚を均一化して排気ガイド部183の周囲にヒケが生じることを抑制できる。また、同様に、インペラハウジング180は、排気ガイド部183の内部に気孔が生じることを抑制できる。さらに、本変形例のインペラハウジング180は、凹部186にリブ185が設けられていることで、インペラハウジング本体部182に対し外周取付リング184の剛性を高めることができる。これにより、インペラハウジング180は、外周取付リング184において、排気誘導部材160と強固に固定することができる。
次に、上述の実施形態およびその変形例のインペラ70に代えて採用可能なインペラ270について、図17を基に説明する。なお、上述の実施形態および変形例と同一態様の構成要素については、同一符号を付し、その説明を省略する。
さらに、ベース部傾斜部273dが設けられることで、ベース部273の径方向外側に位置する突出部166cを小さくして、ベース部273の直径をシュラウド275の直径より大きくすることができる。すなわち、ベース部273の外縁273eは、シュラウド275の外縁275cより径方向外側に位置させることが可能となる。したがって、シュラウド275の寸法を大きくすることなく、インペラ270(特に動翼274)の直径を大きく構成することが可能となる。一般的に、インペラの直径を大きくすることで、低回転であっても高出力の送風装置を構成できる。本変形例によれば、径方向寸法が小さく低回転でありながら高出力な送風装置を提供できる。
次に変形例3の送風装置301について、図面を参照しながら説明する。なお、本変形例において、送風装置の中心軸と平行な方向を「軸方向」、送風装置の中心軸に直交する方向を「径方向」、送風装置の中心軸を中心とする円弧に沿う方向を「周方向」、とそれぞれ称する。また、本変形例において、軸方向を上下方向とし、モータに対してインペラ側を上として、各部の形状や位置関係を説明する。ただし、この上下方向の定義により、本発明に係る送風装置の使用時の向きを限定する意図はない。
なお、本変形例においては、モータ部350は、「モータ」に対応する。
なお、本変形例においては、回転軸351は、「シャフト」に対応する。
なお、本変形例においては、上部ハウジング部352は、「静翼支持部」に対応し、ガイド翼370は、「静翼」に対応する。
筒状空間360は、上部領域361と、上部領域361の下側に位置する下部領域363とを有する。上部領域361と下部領域363とは、上下方向に並んで配置され、下部領域363が上部領域361の下側に位置する。筒状空間360の上端は、上部領域361の上端361aと一致している。また、筒状空間360の下端は、下部領域363の下端363aと一致している。
なお、ここで筒状空間360の上端とは、筒状空間360の軸方向上側に位置する仮想的な面を意味し、流路の上側の開口である。同様に、筒状空間360の下端とは、筒状空間360の軸方向下側に位置する仮想的な面を意味し流路の下側の開口である。
筒状空間360は、上述した上部領域361および下部領域363を有することで、筒状空間360の径方向隙間は、上部領域361と下部領域363との境界部362において最も狭くなる。筒状空間360に流入した空気は、上部領域361において流路抵抗が高まって絞り込まれた後、下部領域363に流入する。下部領域363に流入した空気は、下方に向かう際に、径方向間隙が徐々に広くなる。これにより、空気の圧力が徐々に解放され、流れが徐々に緩やかになり、剥離を起こすことなく排出され、送風効率が向上する。また、このような筒状空間360は、送風効率向上により、騒音低減にも寄与できる。
図24に、単一の部材である本体カバー部302Aを有する送風装置301Aの断面図を示す。この場合、本体カバー部302Aは、筒状空間360を構成する内周面302aにおいて上下方向に沿って連続する1つの部材で構成される。よって、内周面302aは連続した1つの面となる。このため、筒状空間360を通過する空気流の流路に部材同士の繋ぎ目が露出することがないため、空気の剥離が抑制され送風効率を高めることができる。なお、単一の部材である本体カバー部302Aは、境界部362に沿ったパーティングラインにより上下方向を抜き方向とする一対の金型により成形される。
なお、第1リング352aは、上部ハウジング部352のみならず下部ハウジング部353とも単一の部材であってもよい。この場合には、第1リング352aは、中心軸Jに対する同軸度をさらに高めることができ、圧力をさらに安定させることできる。
なお、本変形例においては、ガイド翼370は、「静翼」に対応する。
次に、変形例4の送風装置401について図25を基に説明する。なお、上述の変形例と同一態様の構成要素については、同一符号を付し、その説明を省略する。
本変形例の送風装置401には、変形例3の送風装置301と同様の上部領域461および下部領域463を有する筒状空間460が設けられていることで、送風装置301と同様の効果を奏することができる。すなわち、送風効率を高めることができ、さらに、騒音低減の効果を奏することができる。
本変形例において、第1リング452aと第2リング402bとは互いに別体である場合を例示した。しかしながら、第1リング452aと第2リング402bとは、ガイド翼470と共に単一の部材であってもよい。この場合には、モータ部450に対する筒状空間460の同軸度を高めることができ、流路がモータ部450の中心軸Jに対する対称性を高め流路内の圧力の安定性を高めることができる。
なお、モータハウジング457は、単一の部材であってもよい。図26に、単一の部材であるモータハウジング457Aを有する送風装置401Aを示す。ハウジング部は、筒状空間460を構成する外周面450aにおいて、上下方向に沿って連続する1つの部材で構成され、外周面450aは連続した1つの面となる。このため、筒状空間460を通過する空気流の流路に部材同士の繋ぎ目が露出することがないため、空気の剥離が抑制され送風効率を高めることができる。なお、ハウジング部が1つの部材で構成される場合は、モータ部450の外周面450aと本体カバー部402の内周面402aとの径方向距離が最も狭くなる部分において、パーティングラインが形成される。モータハウジング457Aは、導線をコイル状に巻線して構成されるステータを埋め込んで一体成型することが好ましい。これにより、ステータを強固に保持することができる。
Claims (11)
- 上下方向に延びる中心軸に沿って配置されるシャフトと前記シャフトを回転可能に支持するベアリングとを有するモータと、
前記シャフトの上端側に連結されたインペラと、
前記インペラを収容し上側に吸気口を有するインペラハウジングと、
前記インペラハウジングの下側に位置する複数の静翼と、
前記静翼の径方向内側に位置する円筒状の第1リングと、
前記静翼の径方向外側に位置し、前記インペラハウジングに固定される円筒状の第2リングと、を備え、
前記静翼、前記第1リングおよび前記第2リングは、単一の部材であり、静翼支持部を構成する、送風装置。 - 前記モータは、ハウジングをさらに有し、
前記静翼支持部の少なくとも一部は、前記ハウジングと固定される、請求項1に記載の送風装置。 - 前記静翼の下側に位置する第3リングをさらに備え、
前記静翼支持部は、前記第3リングが固定される第1固定部を有し、
前記第3リングは、外周が軸方向下側に向かうにつれて、径方向外側へ延びる第3リング傾斜部を有する、請求項2に記載の送風装置。 - 前記第3リングは、前記静翼の下側に位置する下部静翼をさらに有する、請求項3に記載の送風装置。
- 前記静翼支持部は、
前記第1固定部とは異なる位置において前記ハウジングに固定される第2固定部を有する、請求項3又は4に記載の送風装置。 - 前記モータは、ハウジングをさらに有し、
前記静翼支持部と、前記ハウジングとは、単一の部材である、請求項1に記載の送風装置。 - 前記インペラハウジングは、前記インペラの上側を覆うインペラハウジング本体部と、前記インペラハウジング本体部の外周縁から径方向外側および下側に延びる排気ガイド部と、排気ガイド部の外周縁から上側に延びて前記第2リングと固定される外周取付リングと、を有し、
前記インペラハウジングの上面には、前記排気ガイド部の上側に位置し周方向に延び、下側に凹む凹部が設けられている、
請求項1から6の何れか一項に記載の送付装置。 - 前記第1リングと前記第2リングとの間には、円筒状の筒状空間が構成され、
前記筒状空間は、上部領域と前記上部領域の下側に位置する下部領域とを有し、
前記第1リングの外周面と前記第2リングの内周面との径方向距離は、前記上部領域においては下側に向かうにつれて連続的に短くなり、前記下部領域においては下側に向かうにつれて連続的に長くなる、
請求項1~7の何れか一項に記載の送風装置。 - 前記インペラは、複数の動翼と前記動翼の下側に位置する円盤状のベース部とを有し、
前記静翼支持部は、上側に突出し前記インペラの径方向外側に位置する円環状の突出部を有し、
前記突出部は、径方向外側に向かうに従って下方に傾斜する外周面を有し、
前記突出部の上端は、前記ベース部の下面よりも上側に位置し、前記ベース部の上面の外端よりも下側に位置する、
請求項1~8の何れか一項に記載の送風装置。 - 前記インペラは、複数の動翼と前記動翼の下側に位置する円盤状のベース部と、前記動翼の上側において上側に向かうにつれ径方向内側に位置する円筒状のシュラウドと、を有し、
前記ベース部は、外縁が前記シュラウドの外縁より径方向外側に位置し、
前記ベース部の上面は、径方向外側に向かうにつれて軸方向下側に傾斜するベース部傾斜部を有する、
請求項1~9の何れか一項に記載の送風装置。 - 掃除機であって、
その特徴は、請求項1から10のいずれかに記載の送風装置を有する。
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Also Published As
Publication number | Publication date |
---|---|
JPWO2016194253A1 (ja) | 2018-03-22 |
EP3306102A4 (en) | 2019-02-27 |
US20170367550A1 (en) | 2017-12-28 |
JP6658750B2 (ja) | 2020-03-04 |
US10517448B2 (en) | 2019-12-31 |
CN207049073U (zh) | 2018-02-27 |
EP3306102A1 (en) | 2018-04-11 |
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