US20180209442A1 - Blower device and cleaner - Google Patents

Blower device and cleaner Download PDF

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Publication number
US20180209442A1
US20180209442A1 US15/567,086 US201615567086A US2018209442A1 US 20180209442 A1 US20180209442 A1 US 20180209442A1 US 201615567086 A US201615567086 A US 201615567086A US 2018209442 A1 US2018209442 A1 US 2018209442A1
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US
United States
Prior art keywords
impeller
stationary blades
blower device
rib
radial direction
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
US15/567,086
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English (en)
Inventor
Tomoyoshi Sawada
Machiko FUKUSHIMA
Haruki YOSHIMATSU
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Nidec Corp
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Nidec Corp
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Filing date
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Assigned to NIDEC CORPORATION reassignment NIDEC CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: YOSHIMATSU, HARUKI, FUKUSHIMA, MACHIKO, SAWADA, TOMOYOSHI
Publication of US20180209442A1 publication Critical patent/US20180209442A1/en
Abandoned legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
    • F04D29/4206—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for elastic fluid pumps
    • F04D29/4226—Fan casings
    • F04D29/4253—Fan casings with axial entry and discharge
    • 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
    • F04D17/00—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps
    • F04D17/08—Centrifugal pumps
    • F04D17/16—Centrifugal pumps for displacing without appreciable compression
    • F04D17/165—Axial entry and discharge
    • 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
    • F04D29/60—Mounting; Assembling; Disassembling
    • F04D29/62—Mounting; Assembling; Disassembling of radial or helico-centrifugal pumps
    • F04D29/624—Mounting; Assembling; Disassembling of radial or helico-centrifugal pumps especially adapted for elastic fluid pumps
    • F04D29/626—Mounting or removal of fans
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D15/00—Control, e.g. regulation, of pumps, pumping installations or systems

Definitions

  • the present disclosure relates to a blower device and a cleaner.
  • blower devices including a plurality of stationary blades have been known, and have been installed in, for example, cleaners.
  • an electric blower in Japanese Unexamined Patent Application Publication No. 2012-67615 includes a motor portion, a centrifugal fan, diffusers, and a fan case.
  • the centrifugal fan is rotationally driven by the motor portion.
  • the diffusers include a plurality of stationary blades disposed around the centrifugal fan.
  • the fan case has an intake port, and covers the diffusers. In order to narrow a gap between the stationary blades and the fan case, the fan case has protrusions.
  • An exemplary blower device includes an impeller that is rotatable around a rotary shaft as a center, the rotary shaft extending in an up-down direction; a motor that rotationally drives the impeller; a motor housing that accommodates the motor therein; a cylindrical member that is disposed outwardly of the motor housing in a radial direction; and an impeller case that accommodates the impeller.
  • a gap is formed between an outer side surface of the motor housing and an inner side surface of the cylindrical member.
  • a plurality of stationary blades are provided on one of side surfaces, that is, one of the outer side surface of the motor housing and the inner side surface of the cylindrical member, the plurality of stationary blades protruding towards the other side surface.
  • the plurality of stationary blades are disposed side by side in a circumferential direction, and form a plurality of air-current paths.
  • At least one of the plurality of stationary blades includes a protrusion. The protrusion protrudes from an outwardly facing surface of the at least one of the plurality of stationary blades in the radial direction and contacts the other side surface.
  • FIG. 1 is a schematic vertical sectional view of a structural example of a blower device.
  • FIG. 2A is a top perspective view of an external housing.
  • FIG. 2B is a top view of the external housing.
  • FIG. 2C is a bottom perspective view of the external housing.
  • FIG. 3 is a local enlarged view of a structural example of a gap between a motor and the external housing.
  • FIG. 4 is a top perspective view of an upper housing.
  • FIG. 5 is a top view of the upper housing.
  • FIG. 6 is a side view of the upper housing.
  • FIG. 7 is a bottom perspective view of the upper housing.
  • FIG. 8 is a bottom view of the upper housing.
  • FIG. 9 is a local enlarged view of a structural example of a stationary blade including a protruding portion.
  • FIG. 10 is a sectional view as seen from an axial direction of a stationary blade before the upper housing is fitted to the external housing.
  • FIG. 11 is a sectional view as seen from the axial direction of the stationary blade after the upper housing has been fitted to the external housing.
  • FIG. 12 is a local enlarged view of another structural example of a stationary blade including a protruding portion.
  • FIG. 13 illustrates an example of a cleaner having the blower device installed therein.
  • a direction of extension of a rotary shaft of a rotor 21 (refer to a shaft 211 in FIG. 1 ) is simply called “axial direction”. Further, in the axial direction, a direction from a circuit board 6 towards an impeller 1 is simply called “upward”, and a direction from the impeller 1 towards the circuit board 6 is simply called “downward”. A surface of each structural element that faces upward in the axial direction is simply called “upper surface”, and a surface of each structural element that faces downward in the axial direction is simply called “lower surface”.
  • a radial direction with the axial direction as a center is simply called “radial direction”, and a circumferential direction with the axial direction as a center is simply called “circumferential direction”.
  • a direction towards the rotary shaft is simply called “inward”, and a direction away from the rotary shaft is simply called “outward”.
  • surfaces of each structural element a side surface of each structural element that faces inward in the radial direction is simply called “inner side surface”, and a side surface of each structural element that faces outward in the radial direction is simply called “outer side surface”.
  • a direction in which air current F that is sent out by the blower device 100 flows is called “blowing direction”.
  • a direction from an upstream side towards a downstream side is simply called “forward”, and a direction from the downstream side towards the upstream side is simply called “backward”.
  • a direction from an upstream side towards a downstream side is simply called “forward”, and a direction from the downstream side towards the upstream side is simply called “backward”.
  • FIG. 1 is a schematic vertical sectional view of a structural example of the blower device 100 .
  • a broken line extending in an up-down direction in FIG. 1 indicates the rotary shaft of the motor 2 .
  • the blower device 100 includes the impeller 1 , the motor 2 of an inner-rotor type, a motor housing 3 , an external housing 4 , an impeller case 5 , and the circuit board 6 .
  • the impeller 1 includes a plurality of blade members 11 .
  • the impeller 1 is provided at an upper portion of the motor 2 .
  • the impeller 1 is rotatable around the rotary shaft as a center, the rotary shaft extending in the up-down direction.
  • the motor 2 rotationally drives the impeller 1 .
  • a structure of the motor 2 is described in detail below.
  • the motor housing 3 accommodates the motor 2 therein.
  • the motor housing 3 includes an upper housing 31 and a lower housing 32 .
  • a lower end of the upper housing 31 contacts an upper end of the lower housing 32 , and is connected to the upper end of the lower housing 32 by using a member (not shown), such as a screw or a rivet.
  • a structure of the upper housing 31 is described in detail below.
  • the lower housing 32 includes a cylindrical portion 321 , a cover portion 322 , and a bearing holding portion 323 .
  • the cylindrical portion 321 extends upward in the axial direction from a peripheral edge of the cover portion 322 in the radial direction.
  • the cover portion 322 has a central opening 322 a.
  • the central opening 322 a is provided in a central portion of the cover portion 322 .
  • the bearing holding portion 323 is fitted into the central opening 322 a, and holds a bearing 24 b of the motor 2 .
  • the bearing holding portion 323 has an opening 323 a to which the shaft 211 of the motor 2 reaches.
  • the cylindrical portion 321 and the cover portion 322 are each a portion of the same member, and are formed separately from the bearing holding portion 323 .
  • the cylindrical portion 321 and the cover portion 322 may be formed as separate members.
  • the bearing holding portion 323 may be a portion of a member of which at least one of the cylindrical portion 321 and the cover portion 322 is a portion.
  • the external housing 4 is a cylindrical member extending in the axial direction.
  • the external housing 4 is disposed outwardly of the motor housing 3 in the radial direction.
  • FIGS. 2A, 2B, and 2C are, respectively, a top perspective view, a top view, and a bottom perspective view of a structural example of the external housing 4 .
  • an upper end and a lower end of the external housing 4 are open.
  • the external housing 4 includes six holding portions 41 on an inner side surface 4 a .
  • the shape of the inner side surface 4 a in the axial direction as seen from the circumferential direction is curved inward in the radial direction.
  • the thickness of the external housing 4 in the radial direction is the largest at a portion thereof opposing lower portions of stationary blades 7 described below.
  • the impeller case 5 accommodates the impeller 1 .
  • the impeller case 5 is provided at an upper portion of the external housing 4 , and covers the opening in the upper end of the external housing 4 .
  • the impeller case 5 has an opening portion 51 that is provided upwardly of the impeller 1 in the axial direction.
  • the circuit board 6 is a board that uses a resin material, such as epoxy.
  • An electronic component 61 is mounted on a lower surface of the circuit board 6 .
  • the electronic component includes, for example, a control circuit and a power supply circuit of the motor 2 , and is electrically connected to the motor 2 (such as, in particular, a stator 22 ) via a wire 62 .
  • a gap G is formed between the motor housing 3 and the external housing 4 . More specifically, the gap G is formed between an outer side surface 3 a of the motor housing 3 and the inner side surface 4 a of the external housing 4 . Even more specifically, the gap G is formed between an outer side surface 31 a of the upper housing 31 described below, an outer side surface 32 a of the lower housing 32 , and the inner side surface 4 a of the external housing 4 . In the axial direction, an upper end and a lower end of the gap G are open. Therefore, the air current F can flow through the upper end and the lower end of the gap G.
  • the blower device 100 causes the air current F that flows into the impeller case 5 from outside the impeller case 5 via the opening portion 51 to be generated by rotationally driving the impeller 1 by the motor 2 .
  • the air current F is sent out towards an outer side of the impeller 1 in the radial direction by the blade members 11 that rotate, and is guided to the upper end of the gap G by an inner surface of the impeller case 5 .
  • the air current F that has flown into the gap G flows downward in the axial direction through ventilation paths P between the plurality of stationary blades 7 described below, and is discharged out from the lower end of the gap G.
  • FIG. 3 is a local enlarged view of a structural example of the gap G between the motor housing 3 and the external housing 4 .
  • a first width WH of the upper end of the gap G in the radial direction is larger than a second width WM in the radial direction at which the width in the radial direction at the paths becomes smallest.
  • the first width WH of each ventilation path P in the radial direction at the upper end of the gap G between the motor housing 3 and the external housing 4 is larger than the second width WM in the radial direction at which the width in the radial direction at each ventilation path P becomes smallest.
  • each ventilation path P in the radial direction gradually becomes smaller towards a downward side in the axial direction from the upper end of the gap G, and becomes smallest at an intermediate portion of each ventilation path P. Therefore, at a portion from the upper end of the gap G to the portion of the gap G having the smallest width in the radial direction, the static pressure increases in the vicinity of an inlet of each ventilation path P into which the air current F flows, so that it is possible to suppress or prevent the generation of turbulence. Consequently, it is possible to increase the blowing efficiency of air current F in the gap G between the motor housing 3 and the external housing 4 .
  • each ventilation path P in the radial direction gradually increases towards the downward side in the axial direction from the portion thereof having the smallest width in the radial direction.
  • the portion having the smallest width in the radial direction may be a lower end of each ventilation path P (that is, lower ends of the stationary blades 7 ).
  • the width of the gap G in the radial direction gradually increases towards the downward side in the axial direction from the lower end of each ventilation path P.
  • a third width WL in the radial direction at which the width of the gap G in the radial direction becomes the largest at a location below the lower ends of the stationary blades 7 in the axial direction is larger than the second width WM in the radial direction. More specifically, at a location below the lower end of each ventilation path P in the axial direction, the third width WL in the radial direction at which the width of the gap G, which is situated between the motor housing 3 and the external housing 4 , in the radial direction becomes the largest is larger than the second width WM in the radial direction at which the width of each ventilation path P becomes smallest.
  • the width in the radial direction at the location below the lower end of each ventilation path P (that is, at a location below the stationary blades 7 ) in the axial direction is the largest at the lower end of the gap G.
  • the width in the radial direction at the location below the lower end of each ventilation path P in the axial direction and above the lower end of the gap G in the axial direction may be the third width WL in the radial direction at which the width in the radial direction is the largest.
  • the motor 2 includes the rotor 21 , the stator 22 that is ring-shaped, a bearing 24 a, and the bearing 24 b.
  • the rotor 21 is a rotor of the motor 2 .
  • the rotation angle of the rotor 21 is detected by a position detection sensor (not shown).
  • the rotor 21 includes the shaft 211 and a plurality of magnets 212 .
  • the shaft 211 is the rotary shaft that extends in the axial up-down direction.
  • the impeller 1 is mounted on an upper portion of the shaft 211 .
  • the stator 22 is an armature of the motor 2 , is provided at a position opposing the rotor 21 , and drives the rotor 21 . More specifically, when electric power is supplied to the stator 22 from an external power supply (not shown) via the circuit board 6 , the rotor 21 rotates relative to the stator 22 .
  • the stator 22 includes a stator core 221 , a plurality of coil portions (not shown), and an insulator 223 .
  • the stator core 221 is a laminated steel plate including electromagnetic steel plates that are laminated in the axial direction. Each coil portion is a winding member including a wire that is wound around the insulator 223 . Each coil portion is provided in the circumferential direction around the shaft 211 as a center.
  • the insulator 223 is an insulating member in which, for example, a resin material is used; and is mounted on the stator core 221 and electrically insulates a portion between the stator core 221 and each coil portion.
  • the bearings 24 a and 24 b are for example, ball bearings or sleeve bearings.
  • the bearing 24 a rotatably supports the shaft 211 at an upper side in the axial direction.
  • the bearing 24 b rotatably supports the shaft 211 at a lower side in the axial direction.
  • FIG. 4 is a top perspective view of the upper housing 31 .
  • FIG. 5 is a top view of the upper housing 31 .
  • FIG. 6 is a side view of the upper housing 31 .
  • FIG. 7 is a bottom perspective view of the upper housing 31 .
  • FIG. 8 is a bottom view of the upper housing 31 .
  • the upper housing 31 includes a cylindrical portion 311 , a cover portion 312 , a bearing holding portion 313 , and thirteen stationary blades 7 .
  • the cylindrical portion 311 extends downward in the axial direction from a peripheral edge of the cover portion 312 in the radial direction.
  • the cover portion 312 has a central opening 312 a to which the shaft 211 reaches.
  • the central opening 312 a is provided in a central portion of the cover portion 312 .
  • the bearing holding portion 313 has a cylindrical shape that extends downward in the axial direction from a peripheral edge of the central opening 312 a, and holds the bearing 24 a.
  • the cylindrical portion 311 , the cover portion 312 , the bearing holding portion 313 , and the thirteen stationary blades 7 are portions of the same member (that is, the upper housing 31 ). However, the present disclosure is not limited to this example according to the exemplary embodiment. At least one of the cylindrical portion 311 , the cover portion 312 , the bearing holding portion 313 , and the thirteen stationary blades 7 may be formed separately from the remaining members.
  • the plurality of stationary blades 7 are provided on one of side surfaces, that is, one of the outer side surface 3 a of the motor housing 3 and the inner side surface 4 a of the cylindrical member, the plurality of stationary blades 7 protruding towards the other side surface.
  • the thirteen stationary blades 7 are provided on the outer side surface 31 a of the cylindrical portion 311 (that is, the outer side surface 31 a of the upper housing 31 ).
  • the present disclosure is not limited to this example according to the exemplary embodiment.
  • the number of stationary blades 7 may be other than thirteen. Desirably, the number of stationary blades 7 differs from the number of blade members 11 of the impeller 1 , or is a prime number.
  • the number of stationary blades 7 differs from the number of blade members 11 of the impeller 1 , and is a prime number. This makes it possible not to allow the natural frequency generated by the upper housing 31 to overlap the vibration frequency of the motor 2 . Therefore, it is possible to suppress resonance of the motor 2 .
  • the plurality of stationary blades 7 are disposed side by side in the circumferential direction and form a plurality of air-current paths. More specifically, the thirteen stationary blades 7 are disposed side by side on the outer side surface 31 a in the circumferential direction, and form the plurality of ventilation paths P in the gap G between the motor housing 3 and the external housing 4 .
  • Each ventilation path P is a path provided for the air current F and extending downward in the axial direction from the upper end of the gap G.
  • every other stationary blade 7 including six stationary blades 7 includes a stationary blade body 74 and a protruding portion 75 . Therefore, when the upper housing 31 is fitted to the external housing 4 , the position of the upper housing 31 with respect to the external housing 4 in the circumferential direction is determined by insertion of the protruding portions 75 into recessed portions 42 of the corresponding holding portions 41 .
  • Seven stationary blades 7 other than the six stationary blades 7 described above do not include a protruding portion 75 .
  • a pair of adjacent stationary blades 7 among the thirteen stationary blades 7 do not include a protruding portion 75 .
  • the present disclosure is not limited to this example according to the exemplary embodiment.
  • the pair of stationary blades 7 may both include a protruding portion 75 .
  • the number of stationary blades 7 including a protruding portion 75 is not limited to this example according to the exemplary embodiment. Of the plurality of stationary blades 7 that are disposed side by side in the circumferential direction, at least one of the stationary blades 7 may include a protruding portion 75 .
  • the number of holding portions 41 on the inner side surface 4 a of the external housing 4 is increased or decreased, and the disposition of the holding portions 41 is changed.
  • Each protruding portion 75 protrudes downward in the axial direction from a lower end of its corresponding stationary blade body 74 .
  • the shape of each protruding portion 75 may be one that allows it to be held by the corresponding holding portion 41 .
  • the protruding portions 75 are held by the holding portions 41 on the inner side surface 4 a of the external housing 4 .
  • the protruding portions 75 are inserted into the recessed portions 42 of the holding portions 41 .
  • lower surfaces 74 a of the stationary blade bodies 74 of the stationary blades 7 including the corresponding protruding portions 75 contact upper surfaces 41 a of the holding portions 41 .
  • the position of the upper housing 31 with respect to the external housing 4 in the axial direction is determined by contact of the lower surfaces 74 a with the upper surfaces 41 a .
  • Each protruding portion 75 is bonded to its corresponding holding portion 41 with an adhesive that is previously applied to at least one of the protruding portion 75 and the recessed portion 42 .
  • each stationary blade 7 including the corresponding protruding portion 75 is the same as the structure of each stationary blade 7 not including a protruding portion 75 except for the protruding portion 75 . Therefore, in the description below, the structure of each stationary blade 7 including the corresponding protruding portion 75 is given as an example, and the stationary blades 7 not including a protruding portion 75 are not described.
  • FIG. 9 is a local enlarged view of a structural example of a stationary blade 7 including a protruding portion 75 .
  • FIG. 10 is a sectional view as seen from the axial direction of a stationary blade 7 before the upper housing 31 is fitted to the external housing 4 .
  • FIG. 11 is a sectional view as seen from the axial direction of the stationary blade 7 after the upper housing 31 has been fitted to the external housing 4 .
  • the cross section of the stationary blade 7 shown in FIG. 10 is a section taken along an alternate long and short dashed line X-X in FIG. 9 before the fitting
  • the cross section of the stationary blade 7 shown in FIG. 11 is a section taken along the alternate long and short dashed line X-X in FIG. 9 after the fitting.
  • Each stationary blade 7 protrudes outward in the radial direction from the outer side surface 31 a, and extends in the axial up-down direction on the outer side surface 31 a. In the gap G, each stationary blade 7 protrudes towards the inner side surface 4 a of the external housing 4 from the outer side surface 31 a, and extends downward in the axial direction from the upper end of the gap G.
  • each stationary blade 7 is curved towards the back in the rotation direction of the impeller 1 . More specifically, in the axial direction, an upper portion of each stationary blade 7 (in particular, an upper end portion of each stationary blade body 74 ) is curved towards the back in the rotation direction of the impeller 1 (towards the left in FIG. 9 ). Therefore, it becomes easier for the air current F generated by the rotation of the impeller 1 to flow into the ventilation paths P between the stationary blades 7 .
  • At least one of the plurality of stationary blades 7 includes a protrusion 71 .
  • the protrusion 71 protrudes from a surface of the at least one of the plurality of stationary blades 7 that faces the other side surface and contacts the other side surface.
  • each stationary blade 7 includes the corresponding protrusion 71 that extends linearly.
  • Each protrusion 71 is provided on an outer side surface 7 a of the corresponding stationary blade 7 facing outward in the radial direction.
  • the protrusions 71 are disposed in the gap G between the upper housing 31 and the external housing 4 .
  • the protrusions 71 extend downward from an upper side along the ventilation paths P.
  • the protrusions 71 each have a linear shape.
  • Each protrusion 71 also protrudes towards the inner side surface 4 a of the external housing 4 from the outer side surface 7 a of its corresponding stationary blade 7 , and contacts the inner side surface 4 a.
  • Each protrusion 71 includes a first rib 711 and a second rib 712 .
  • Each first rib 711 and each second rib 712 are so-called thread ribs.
  • Each first rib 711 is positioned at an edge of the corresponding stationary blade 7 that is located at a front side in the rotation direction of the impeller 1 .
  • Each first rib 711 is a protrusion that extends linearly along the edge at the front side in the rotation direction of the impeller 1 .
  • Each first rib 711 is formed from an upper end to a lower end of the edge at the front side in the rotation direction.
  • the first ribs 711 can suppress or prevent the air current F flowing through the ventilation paths P that are situated forwardly of the stationary blades 7 in the rotation direction from passing between the corresponding stationary blades 7 and the inner side surface 4 a of the external housing 4 . That is, the first ribs 711 can suppress or prevent the air current F flowing through the ventilation paths P that are situated forwardly of the stationary blades 7 in the rotation direction from flowing into the ventilation paths P that are situated backwardly of the stationary blades 7 in the rotation direction. Further, at an edge of each outer side surface 7 a at the front side in the rotation direction of the impeller 1 , the gap G cannot exist between the inner side surface 4 a of the external housing 4 and each stationary blade 7 including the first rib 711 .
  • the first ribs 711 are not limited to that illustrated in FIG. 9 , and may each be provided at a portion other than the edge of its corresponding outer side surface 7 a. That is, in the rotation direction of the impeller 1 , each first rib 711 may be positioned forwardly of the center of the corresponding stationary blade 7 in the circumferential direction. According to this structure, it is also possible to suppress or prevent the air current F flowing through the ventilation paths P that are situated forwardly of the stationary blades 7 in the rotation direction from flowing into the ventilation paths P that are situated backwardly of the stationary blades 7 in the rotation direction.
  • Each second rib 712 is positioned at an edge of the corresponding stationary blade 7 that is located at a back side in the rotation direction of the impeller 1 .
  • Each second rib 712 is a protrusion that is provided on the outer side surface 7 a of the corresponding stationary blade 7 , and extends linearly upward in the axial direction from the lower end of the corresponding stationary blade 7 . Therefore, even if each second rib 712 is provided on the outer side surface 7 a of the corresponding stationary blade 7 , in a process of manufacturing the upper housing 31 , it is possible to remove the upper housing 31 from a die without interfering with the release from the die. An upper end of each second rib 712 in the axial direction contacts the corresponding first rib 711 .
  • each protrusion 71 further includes the second rib 712 that extends upward in the axial direction from the lower end of the corresponding stationary blade 7 and is connected to the corresponding first rib 711 . Therefore, the second ribs 712 can contribute to suppressing or preventing the air current F flowing through the ventilation paths P that are situated forwardly of the stationary blades 7 in the rotation direction from flowing into the ventilation paths P that are situated backwardly of the stationary blades 7 in the rotation direction.
  • a height h of each first rib 711 and a height h of each second rib 712 in the radial direction are larger than the difference between the width of the gap G, which is situated between the outer side surface 31 a of the upper housing 31 and the inner side surface 4 a of the external housing 4 , in the radial direction and the height of the corresponding stationary blade 7 . Therefore, the first ribs 711 and the second ribs 712 can contact the inner side surface 4 a of the external housing 4 without a gap therebetween.
  • the height h of each first rib 711 in the radial direction and the height h of each second rib 712 in the radial direction before fitting the upper housing 31 to the external housing 4 is larger than a width d of the gap (see FIG. 11 ), which is situated between the outer side surface 7 a of the corresponding stationary blade 7 and the inner side surface 4 a, in the radial direction after the upper housing 31 has been fitted to the external housing 4 . Therefore, when the upper housing 31 has been fitted to the external housing 4 , as shown in FIG.
  • each first rib 711 and an end of each second rib 712 are deformed as a result of being pressed by the inner side surface 4 a, and contact at a surface thereof the inner side surface 4 a along the ventilation paths P. That is, the protrusions 71 each contact at a surface thereof the other side surface.
  • a region of the inner side surface 4 a of the external housing 4 with which end portions of the first ribs 711 and end portions of the second ribs 712 contact has a certain amount of contact area.
  • each first rib 711 and the sectional shape of each second rib 712 be a sectional shape that allows the ends of the first ribs 711 and the ends of the second ribs 712 to contact the inner side surface 4 a of the external housing 4 without any gap therebetween when the upper housing 31 is fitted to the external housing 4 .
  • the sectional shape of each first rib 711 and the sectional shape of each second rib 712 may each be one having a horn at its end as shown in FIG. 10 . It is desirable that each horn have an acute angle. This makes it easier to deform the end of each first rib 711 and the end of each second rib 712 .
  • each first rib 711 and the deformed end of each second rib 712 more easily contact at a surface thereof the inner side surface 4 a of the external housing 4 along the ventilation paths P. Consequently, it is possible to increase the contact area of the inner side surface 4 a with each stationary blade 7 and bring the first ribs 711 and the second ribs 712 into contact with the inner side surface 4 a without any gap therebetween.
  • portions between the first ribs 711 and the corresponding second ribs 712 are filled with an adhesive (not shown).
  • the adhesive is an adhesive material that flows out from a portion between the lower end of each stationary blade body 74 and the corresponding holding portion 41 when inserting each protruding portion 75 into the recessed portion of its corresponding holding portion 41 and bonding each protruding portion 75 to its corresponding recessed portion 42 .
  • the adhesive that has flown out to each outer side surface 7 a spreads at the portion between the first rib 711 and the second rib 712 on the outer side surface 7 a of its corresponding stationary blade body 74 . However, the adhesive is blocked by each first rib 711 and its corresponding second rib 712 .
  • the first ribs 711 and the second ribs 712 on the corresponding outer side surfaces 7 a can suppress or prevent leakage of the adhesive to the ventilation paths P. Therefore, it is possible to suppress or prevent a reduction in the blowing efficiency of air current F caused by the adhesive protruding out to the ventilation paths P.
  • the protrusion 71 of each stationary blade 7 includes the corresponding second rib 712 extending in the axial direction.
  • the protrusion 71 of each stationary blade 7 may include a third rib 713 extending along another edge of the corresponding outer side surface 7 a in the circumferential direction.
  • FIG. 12 is a local enlarged view of another structural example of a stationary blade 7 including a protruding portion 75 .
  • the stationary blade 7 includes a third rib 713 in addition to a first rib 711 .
  • the third rib is a thread rib.
  • the sectional shape of the third rib 713 be a sectional shape that allows an end of the third rib 713 to contact the inner side surface 4 a of the external housing 4 without any gap therebetween when the upper housing 31 is fitted to the external housing 4 (see FIGS. 10 and 11 ).
  • Each third rib 713 is positioned at an edge of the corresponding stationary blade 7 that is located at a back side in the rotation direction of the impeller 1 .
  • Each third rib 713 is a protrusion that extends linearly along the edge at the back side in the rotation direction of the impeller 1 .
  • Each third rib 713 is formed from an upper end to a lower end of the edge at the back side in the rotation direction. Therefore, the third ribs 713 can suppress or prevent the air current F flowing through the ventilation paths P that are situated backwardly of the stationary blades 7 in the rotation direction from passing between the outer side surfaces 7 a of the corresponding stationary blades 7 and the inner side surface 4 a of the external housing 4 .
  • the third ribs 713 can suppress or prevent the air current F flowing through the ventilation paths P that are situated backwardly of the stationary blades 7 in the rotation direction from flowing into the ventilation paths P that are situated forwardly of the stationary blades 7 in the rotation direction. Further, at an edge of each outer side surface 7 a at the back side in the rotation direction of the impeller 1 , a gap cannot exist between the inner side surface 4 a of the external housing 4 and each stationary blade 7 including the third rib 713 . Therefore, it is possible to suppress the generation of turbulence at the ventilation paths P that are situated backwardly of the stationary blades 7 including the corresponding third ribs 713 in the rotation direction. Consequently, it is possible to effectively suppress a reduction in the blowing efficiency of air current F flowing through the ventilation paths P.
  • the third ribs 713 are not limited to that illustrated in FIG. 12 , and may each be provided at a portion other than the edge of its corresponding outer side surface 7 a. That is, each third rib 713 may in the rotation direction of the impeller 1 be positioned backwardly of the center of the outer side surface 7 a of the corresponding stationary blade 7 in the circumferential direction.
  • each protrusion 71 may include the third rib 713 that in the rotation direction of the impeller 1 is positioned backwardly of the center of the corresponding stationary blade 7 in the circumferential direction. Even here, it is possible to suppress or prevent the air current F flowing through the ventilation paths P that are situated backwardly of the stationary blades 7 in the rotation direction from flowing into the ventilation paths P that are situated forwardly of the stationary blades 7 in the rotation direction.
  • the protrusion 71 includes both the first rib 711 and third rib 713 , the present disclosure is not limited to this example according to the exemplary embodiment.
  • the protrusion 71 may include the third rib 713 in place of the first rib 711 . Even here, the third rib 713 can suppress or prevent the air current F flowing through the ventilation paths P from passing between the outer side surface 7 a of the stationary blade 7 and the inner side surface 4 a of the external housing 4 .
  • FIG. 13 is a perspective view of a structure of the cleaner 200 in which the blower device 100 is installed.
  • the cleaner 200 has the blower device 100 installed therein.
  • the cleaner 200 includes a sucking portion 210 and a body 220 .
  • the blower device 100 is installed at the body 220 .
  • a suction brush (not shown) is mounted at an intake section 211 of the sucking portion 210 .
  • the body 220 includes a dust collecting chamber 221 that is connected to the sucking portion 210 , an accommodation chamber 222 that accommodates the blower device 100 , and an exhaust space 223 that is connected to a plurality of exhaust sections (not shown).
  • the opening portion 51 of the blower device 100 is connected to the dust collecting chamber 221 via a dust collecting filter (not shown). That is, the paths for air current F that is sucked by the blower device 100 are connected to the opening portion 51 of the blower device 100 via the sucking portion 210 and the dust collecting chamber 221 in that order from the intake section 211 .
  • the accommodation chamber 222 is connected to the exhaust space 223 .
  • the air current F sent out by the blower device 100 is discharged to the outside of the body 220 from the exhaust sections via the exhaust space 223 . This makes it possible to realize the cleaner 200 including the blower device 100 that can effectively suppress a reduction in the blowing efficiency.
  • the blower device 100 is installed in the cleaner 200 of a stick type, the present disclosure is not limited to this example according to the exemplary embodiment.
  • the blower device 100 may be installed in cleaners of other types.
  • the cleaner 200 may be, for example, a canister-type cleaner or a handy-type cleaner.
  • the present disclosure is not limited to this example. At least one of the plurality of stationary blades 7 may protrude from the inner side surface 4 a of the external housing 4 .
  • the holding portion 41 that holds the lower end of the at least one of the stationary blades 7 that protrudes from the inner side surface 4 a is provided on the outer side surface 3 a of the motor housing 3 (such as the outer side surface 31 a of the upper housing 31 ). That is, a plurality of stationary blades 7 may protrude inwardly in the radial direction from the inner side surface 4 a of the external housing 4 .
  • the holding portions 41 that hold the lower ends of the corresponding stationary blades 7 may be provided on the outer side surface 3 a of the motor housing 3 .
  • the holding portions 41 that hold the lower ends of the corresponding stationary blades 7 may be provided on the other side surface.
  • At least one of the plurality of stationary blades 7 may be provided on both the outer side surface 31 a and outer side surface 32 a. That is, the at least one of the stationary blades 7 may include an upper portion that protrudes from the outer side surface 31 a and a lower portion that protrudes from the outer side surface 32 a.
  • the present disclosure is suited for a device that sucks and sends out gas and that is required to have high static pressure.
  • the present disclosure is usable in other blower devices, such as an electric fan or a ventilating fan; and is also usable in electrical devices used for other purposes, such as a drier device.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
US15/567,086 2016-06-30 2016-06-30 Blower device and cleaner Abandoned US20180209442A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2016/069386 WO2018003051A1 (fr) 2016-06-30 2016-06-30 Dispositif de soufflante et dispositif de nettoyage

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US20180209442A1 true US20180209442A1 (en) 2018-07-26

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US15/567,086 Abandoned US20180209442A1 (en) 2016-06-30 2016-06-30 Blower device and cleaner

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US (1) US20180209442A1 (fr)
EP (1) EP3327294A4 (fr)
JP (1) JPWO2018003051A1 (fr)
CN (1) CN107850086A (fr)
WO (1) WO2018003051A1 (fr)

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US11976668B2 (en) * 2019-01-16 2024-05-07 Ebm-Papst Mulfingen Gmbh & Co. Kg Flow guiding device and fan assembly with flow guiding device

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WO2023216742A1 (fr) * 2022-05-09 2023-11-16 追觅创新科技(苏州)有限公司 Support de ventilateur, moteur électrique et soufflante

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Also Published As

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EP3327294A4 (fr) 2019-04-17
EP3327294A1 (fr) 2018-05-30
CN107850086A (zh) 2018-03-27
JPWO2018003051A1 (ja) 2019-04-18
WO2018003051A1 (fr) 2018-01-04

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