JP2010249036A - Electric blower and vacuum cleaner using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a high performance electric blower capable of reducing loss and improving efficiency. <P>SOLUTION: In the electric blower, an impeller 55 is composed of a front shroud 34, a suction port 39 formed at its center, a rear shroud 33, an inducer 36 provided at the center of the rear shroud 33 and having a plurality of blades 44 on a substantially projecting base 43, and a blade 60 provided between the front shroud 34 and the rear shroud 33 and connected to the blades 44. The blade 60 is formed of a metal blade body (not shown) caulked to the front shroud 34 and the rear shroud 33, and a resin body (not shown) integrally molded to the periphery of the blade body. Therefore, it is possible to prevent air from being leaked from a clearance between the blade 60 and the front and rear shrouds 34, 33 and from a caulking portion for the blade 60, the front shroud 34 and the rear shroud 33. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an electric blower and a vacuum cleaner mounted on a vacuum cleaner.

  In recent years, electric vacuum cleaners using electric blowers have a tendency to increase output in order to effectively perform carpet cleaning and the like.

  Below, the structure of the conventional electric blower used for a vacuum cleaner is demonstrated using FIGS. 16-20. 16 is a cross-sectional view of a main part of a conventional electric blower, FIG. 17 is a perspective view of an impeller of the electric blower, FIG. 18 is a plan view and a cross-sectional view of the impeller, and FIG. 19 is a perspective view of a blade of the impeller. 20 and 20 are cross-sectional views of the main part of the impeller.

  As shown in FIG. 16, an electric motor 31 constituting a conventional electric blower 1 includes an armature on a stator 2 formed by applying a field winding 4 to a field core 3 and an armature core 7 provided on a shaft 6. A winding 8 is provided, and a commutator 9 is arranged coaxially, and is constituted by a rotor 5 that is rotatably fixed by bearings 10 provided at both ends of the shaft 6.

  The rotor 5 is fixed to the housing 11 and the bracket 12 via the bearing 10, and the stator 2 is fixed to the inner surface of the housing 11. A pair of brush holder units 15 is fixed to the housing 11 via a cage 13 made of resin.

  The brush holder unit 15 includes a cylindrical body 23 having a substantially rectangular parallelepiped outer shape formed by bending a metal flat plate such as brass with a press and a lid body 16 that closes one of the openings of the cylindrical body 23. A holder 20, a rectangular carbon brush 26 that slides on the inner surface of the holder 20, a conductive wire 17 that electrically connects the end face of the carbon brush 26 on the side opposite to the commutator, and the lid body 16; The coil spring 18 is inserted between the lid 16 and the carbon brush 26. The carbon brush 26 is always urged toward the commutator 9 due to the elasticity of the coil spring 18.

  The bracket 12 includes a holding portion 12 a that holds the bearing 10 at the center portion, and a screw for fixing the bracket 12 to the housing 11 at a portion facing the flange portion of the housing 11 near the outermost periphery of the bracket 12. (Not shown) is provided, and the screw is fastened to the housing 11 via the bracket 12, thereby fixing the bracket 12 to the housing 11 and forming a housing of the electric motor 31.

  As shown in FIGS. 17 and 18, the impeller 32 includes a sheet metal rear shroud 33, a front shroud 34 having an air inlet 39 in the center, and a sheet metal disposed between the front shroud 34 and the rear shroud 33. The blade 35 made of the blade and the blade portion 44 having a three-dimensional curved surface located on the extension of the blade 35 toward the intake port 39 are constituted by an inducer 36 integrally formed on the base portion 43.

  As shown in FIG. 19, the blade 35, the opposed front shroud 34, and the rear shroud 33 are caulking projections 37 provided on the blade 35, and the caulking provided to both the front shroud 34 and the rear shroud 33. The hole 38 is joined by caulking.

The impeller 32 is fastened and fixed to the screw portion at the end of the shaft 6 of the electric motor 31 by a nut 51. On the outer periphery of the impeller 32, an air guide 41 provided with a stationary blade that rectifies a high-speed discharge flow discharged from the impeller 32. The impeller 32 and the air guide 41 are included, and a suction port 42 is provided at the center. The provided casing 40 is airtightly attached to the outer periphery of the bracket 12 of the electric motor 31 (see, for example, Patent Document 1).

  The operation of the conventional electric blower configured as described above is as follows.

When the electric blower 1 is energized and operated, the armature winding 8 is energized from the carbon brush 26 through the commutator 9. The rotor 5 rotates due to the magnetic field generated by the field winding 4 and the action of the armature winding 8. When the rotor 5 rotates, the impeller 32 provided on the shaft 6 that is the output shaft rotates. The impeller 32 rotates, air is sucked from the suction port 42 of the casing 40, air flows into the suction port 39 of the impeller 32, and passes through the ventilation path surrounded by the blade portion 44 and the base portion 43 of the inducer 36, The air is discharged from the outer periphery of the impeller 32 through a ventilation path surrounded by the front shroud 34, the rear shroud 33, and the blade 35. The discharged high-speed air flow passes while being rectified by the air guide 41, flows below the bracket 12, flows into the electric motor 31, and cools the field winding 4 and the armature winding 8 while cooling the electric blower. 1 is discharged.
Japanese Patent No. 3246039

  However, in the configuration of the conventional electric blower 1 described above, when the impeller 32 rotates, the air flow from the air inlet 39 through the air passage surrounded by the base portion 43 and the blade portion 44 of the inducer 36, the front shroud 34 and the rear shroud 34. The cross-sectional shape of the air passage formed by the front shroud 34, the rear shroud 33, and the blade 35, which is composed only of sheet metal parts, is substantially rectangular and includes corners. The part becomes a ventilation path having a substantially right angle.

  The air flow passing at high speed is one of the major factors causing loss and vortex of air flow at the corner of the cross section of the ventilation path.

  Further, a slight gap between the caulking projection 37 of the blade 35 provided to fix the blade 35, the front shroud 34, the caulking hole 38 of the rear shroud 33, and a portion that contacts the front shroud 34 of the blade 35. Leakage of the air flow occurred from a slight gap that was made possible, which was one of the major causes of loss (see FIG. 20).

  The loss generated inside the impeller 32 is an impediment to improving the performance of the electric blower 1.

  In order to solve these problems, the impeller is formed of a resin blade having a three-dimensional shape in the air passage inside the impeller and having an inclination angle (ray angle) in the blade itself with respect to the rotation direction of the impeller. However, in the current electric blower that rotates at a high speed of 40,000 r / min or more during operation in actual use, the blade is connected with the front shroud and the rear shroud with the current resin material. It is impossible to realize an impeller using a blade that can withstand centrifugal force during high-speed rotation.

Also, in order to prevent leakage due to the caulking part and the gap between the blade and the front shroud, a method of filling the entire impeller in the solution and filling the gap part, or pouring an adhesive into the gap part and eliminating the gap is proposed, Although measures to reduce loss due to leakage from gaps have been implemented, after assembly of the impeller, a process must be provided and implemented, which cannot be realized at a low cost with an increase in man-hours, There was a problem that measures against air flow vortices and turbulence were not taken.

  The present invention solves the above-described conventional problems, secures bonding strength, prevents leakage from the caulking portion and the gap between the front shroud and the blade, and is formed by the front shroud, the rear shroud and the blade. An object of the present invention is to provide a highly efficient electric blower that can form a three-dimensionally shaped ventilation path by making the corner of the cross section of the ventilation path into an R shape, and has high performance at low cost.

  In order to solve the above-described conventional problems, an electric blower of the present invention is arranged on an impeller, an electric motor that rotationally drives the impeller, and an outer periphery of the impeller, and regulates an airflow discharged from the impeller and guides it downstream. In the electric blower including an air guide, the impeller and the fan case including the air guide and having a suction port in the center, the impeller includes a front shroud having a suction port in the center and a rear surface facing the front shroud. A shroud, an inducer provided at a central portion of the rear shroud and having a plurality of blades on a substantially convex base, and disposed between the front shroud and the rear shroud, The blade is made of metal and is brazed to the front shroud and the rear shroud. And a resin body integrally molded on the outer periphery of the blade body. Between the blade and the front shroud, between the blade and the rear shroud, from the caulking portion of the blade, the front shroud, and the rear shroud. Therefore, a high-performance electric blower can be provided.

  The electric blower of the present invention can realize a high-efficiency and high-performance electric blower at low cost by the same assembly process as before.

  According to a first aspect of the present invention, there is provided an impeller, an electric motor that rotationally drives the impeller, an air guide that is arranged on an outer periphery of the impeller and that regulates an airflow discharged from the impeller and guides the airflow downstream, and the impeller and the air guide. In the electric blower including a fan case including a suction port in the center, the impeller includes a front shroud having a suction port in the center, a rear shroud opposed to the front shroud, and a central portion of the rear shroud. And an inducer having a plurality of blade portions on a substantially convex base portion, a blade arranged between the front shroud and the rear shroud and connected to the blade portions, The blade body is made of metal and is crimped to the front shroud and the rear shroud, and is integrally molded on the outer periphery of the blade body It is made of a resin body that can prevent air leakage between the blade and front shroud, between the blade and rear shroud, and between the blade, front shroud, and rear shroud. Can provide.

  2nd invention provides the R shape in the inner surface of the part which contact | abuts each of the front surface shroud and each of the rear surface shrouds of the resin body of 1st invention, From a braid | blade and a front surface, a rear surface shroud, and a caulking part Air leakage can be prevented, the occurrence of vortices and turbulence in the air passage can be suppressed, and loss can be reduced, so that a higher performance electric blower can be provided.

  In the third invention, the thickness of the resin body on the rotation direction side of the impeller of the first or second invention is gradually reduced from the front shroud side to the rear shroud to prevent air leakage of the impeller. In addition, the occurrence of vortices and turbulence in the air passage can be suppressed, and loss can be reduced by a smooth flow, so that a higher performance electric blower can be provided.

  According to a fourth aspect of the invention, the thickness of the portion in contact with the rear shroud of the resin body according to any one of the first to third aspects is gradually reduced from the center side end surface to the outer peripheral side end surface of the impeller. Since the loss at the intake port of the impeller can be reduced, a high-performance electric blower can be provided.

  A vacuum cleaner according to a fifth aspect of the present invention includes the electric blower according to any one of the first to fourth aspects of the invention, and can realize an inexpensive and high-performance vacuum cleaner.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments.

(Embodiment 1)
FIG. 1 is a plan view and a sectional view of an impeller of an electric blower according to a first embodiment of the present invention, FIG. 2 is a perspective view of a blade of the impeller, and FIG. 3 is an enlarged sectional view of a main part of the impeller. is there. In addition, the same code | symbol is attached | subjected about the same component as the said prior art example, and the description is abbreviate | omitted.

  1 to 3, the impeller 55 of the electric blower according to the present embodiment includes a rear shroud 33 made of sheet metal, a front shroud 34 having an air inlet 39 in the center, and between the front shroud 34 and the rear shroud 33. And an inducer 36 integrally formed on the base 43 with a blade portion 44 having a three-dimensional curved surface located on an extension of the blade 60 on the intake port 39 side. As shown in FIG. 2, the blade 60 includes a sheet metal blade body 61 and a resin body 62 molded integrally with the outer side of the blade body 61.

  As shown in FIG. 3, the blade 60, the opposed front shroud 34 and the rear shroud 33 are caulking projections 37 provided on the blade 60 and the caulking provided on both the front shroud 34 and the rear shroud 33. The hole 38 is joined by caulking. The impeller 55 is fastened and fixed to the screw portion at the end of the shaft 6 of the electric motor 31 by a nut 51. On the outer periphery of the impeller 55, an air guide 41 provided with a stationary blade for rectifying a high-speed discharge flow discharged from the impeller 55, the impeller 55 and the air guide 41 are included, and a suction port 42 is provided in the center. The provided casing 40 is airtightly attached to the outer periphery of the bracket 12 of the electric motor 31.

  The operation of the electric blower in the present embodiment configured as described above will be described below.

  When the electric blower 1 is energized and operated and the impeller 55 rotates, air is sucked from the suction port 42 of the casing 40, air flows into the suction port 39 of the impeller 55, and the blade portion 44 and the base portion 43 of the inducer 36. Through the ventilation path surrounded by the front shroud 34, the rear shroud 33 and the blade 60, and is discharged from the outer periphery of the impeller 55. At this time, in the ventilation path inside the impeller 55, the resin body 62 is configured by the blade 60 integrally formed with the blade body 61, so that a gap formed between the front shroud 34 and the blade 60 is a resin body 62. To prevent air leakage.

  Therefore, since the loss in the impeller 55 of the electric blower 1 is reduced, a highly efficient electric blower can be provided.

(Embodiment 2)
FIG. 4 is a perspective view of the blade body of the impeller of the electric blower according to the second embodiment of the present invention, and FIG. 5 is a perspective view of the blade of the impeller. In addition, the same code | symbol is attached | subjected about the same component as the electric blower in the said prior art example and embodiment, and the description is abbreviate | omitted.

  As shown in FIGS. 4 and 5, the blade 60 of the impeller 55 of the electric blower according to the present embodiment is configured by a sheet metal blade body 65 and a resin body 62 that is integrally molded outside the blade body 65. The blade body 65 is provided with a plurality of openings 66 penetrating in the thickness direction. When the blade body 65 is integrally molded with the resin body 62, the opening 66 of the blade body 65 is filled with the resin. It has become.

  As described above, according to the present embodiment, the resin body 62 that is thinly integrally formed on the surface of the blade body 65 fills the opening 66, thereby preventing the resin body 62 from being peeled off from the blade body 65. Thus, the strength of the blade body 65 is increased, and the weight of the blade body 65 made of metal is reduced. Thus, the weight can be reduced.

  Therefore, the loss in the impeller 55 of the electric blower 1 is reduced, and a lightweight and highly efficient electric blower can be provided.

(Embodiment 3)
FIG. 6 is a perspective view of an impeller blade of an electric blower according to a third embodiment of the present invention, and FIG. 7 is a cross-sectional view of a main part of the impeller (a portion other than a caulking portion and a caulking portion). In addition, the same code | symbol is attached | subjected about the same component as the electric blower in the said prior art example and embodiment, and the description is abbreviate | omitted.

  As shown in FIGS. 6 and 7, the blade 70 of the impeller 55 of the electric blower in the present embodiment is constituted by a blade body 61 and a resin body 72 integrally molded on the outside of the blade body 61. The end portions of the resin body 72 that come into contact with the front shroud 34 and the rear shroud 33 are provided with an R shape so that the surfaces gently come into contact with the inner surfaces of the front shroud 34 and the rear shroud 33 from the side surface of the blade 70. is there.

  The operation of the electric blower in the present embodiment configured as described above will be described below.

  When the electric blower 1 is energized and operated, the impeller 55 rotates, air is sucked from the suction port 42 of the casing 40, air flows into the suction port 39 of the impeller 55, and the blade portion 44 and the base of the inducer 36. The air is discharged from the outer periphery of the impeller 55 through the ventilation path surrounded by the front shroud 34, the rear surface shroud 33, and the blade 70 through the ventilation path surrounded by the portion 43. At this time, in the air passage inside the impeller 55, the corners of the cross-sectional shape of the air passage are gentle due to the R shape formed by the resin body 72 in the portion that contacts the blade 70, the front shroud 34, and the rear shroud 33. Therefore, air flow vortices and turbulence at the corners are suppressed.

  Therefore, since the loss in the impeller 55 of the electric blower 1 is greatly reduced, a highly efficient electric blower can be provided.

(Embodiment 4)
FIG. 8 is a perspective view of an impeller blade of an electric blower according to a fourth embodiment of the present invention, and FIG. 9 is a cross-sectional view of a main portion of the impeller (a portion other than a caulking portion and a caulking portion). In addition, the same code | symbol is attached | subjected about the same component as the electric blower in the said prior art example and embodiment, and the description is abbreviate | omitted.

As shown in FIGS. 8 and 9, the blade 80 of the impeller 55 of the electric blower in the present embodiment is configured by a blade body 61 and a resin body 82 that is integrally molded on the outside of the blade body 61. The thickness of the body 82 is determined in the plane of the traveling direction of the impeller 55 in the rotational direction.
It is gradually reduced from the portion that contacts the front shroud 34 to the portion that contacts the rear shroud 33. That is, a slope is formed at the end of the resin body 82 from the front shroud 34 to the rear shroud 33.

  The operation of the electric blower in the present embodiment configured as described above will be described below.

  When the electric blower 1 is energized and operated and the impeller 55 rotates, air is sucked from the suction port 42 of the casing 40, air flows into the suction port 39 of the impeller 55, and the blade portion 44 and the base portion 43 of the inducer 36. Through the ventilation path surrounded by the front shroud 34, the rear surface shroud 33, and the blade 70, and is discharged from the outer periphery of the impeller 55. At this time, in the ventilation path inside the impeller 55, the air flows more smoothly due to the slope formed from the front shroud 34 side to the rear shroud 33 by the resin body 82 on the surface in the rotational direction of the impeller 55. The air is discharged from the outer periphery of the impeller 55. Accordingly, the loss of air flow in the ventilation path is significantly reduced.

  Therefore, since the loss in the impeller 55 of the electric blower 1 is remarkably reduced, a more efficient electric blower can be provided.

(Embodiment 5)
FIG. 10 is a plan view and a sectional view of an impeller of an electric blower according to a fifth embodiment of the present invention, and a sectional view of a blade of the impeller. In addition, the same code | symbol is attached | subjected about the same component as the electric blower in the said prior art example and embodiment, and the description is abbreviate | omitted.

  As shown in FIG. 10, the blade 85 of the impeller 55 of the electric blower in the present embodiment is configured by a blade body 61 and a resin body 86 that is integrally molded on the outside of the blade body 61. On the side that contacts the rear shroud 33, the thickness of the resin gradually decreases from the center of the impeller 55 toward the outer periphery. That is, the ventilation path in the impeller 55 forms an inclined surface from the center to the outer peripheral direction.

  The operation of the electric blower in the present embodiment configured as described above will be described below.

  When the electric blower 1 is energized and operated and the impeller 55 rotates, air is sucked from the suction port 42 of the casing 40, air flows into the suction port 39 of the impeller 55, and the blade portion 44 and the base portion 43 of the inducer 36. Through the ventilation path surrounded by the front shroud 34, the rear shroud 33 and the blade 75, and is discharged from the outer periphery of the impeller 55. At this time, in the ventilation path inside the impeller 55, air flows smoothly and is discharged from the outer periphery of the impeller 55 by the slope of the resin body 82 formed on the rear shroud 33 side from the center of the impeller 55 to the outer peripheral direction. Therefore, the loss of the air flow in the ventilation path is reduced.

  Therefore, since the loss in the impeller 55 of the electric blower 1 is remarkably reduced, a more efficient electric blower can be provided.

(Embodiment 6)
FIG. 11 is a plan view of an impeller of an electric blower and a cross-sectional view of the impeller according to the sixth embodiment of the present invention, and FIG. 12 is a perspective view of a blade of the impeller. In addition, the same code | symbol is attached | subjected about the same component as the electric blower in a prior art example and the said embodiment, and the description is abbreviate | omitted.

As shown in FIGS. 11 and 12, the impeller 88 of the electric blower according to the present embodiment includes a rear shroud 33 made of sheet metal, a front shroud 34 having an air inlet 39 in the center, a front shroud 34, and a rear shroud 33. It is comprised from the blade 89 distribute | arranged between these.

  The blade 89 includes a blade body 61 made of sheet metal and a resin body 90 molded integrally with the outside of the blade body 61. The thickness of the resin body 90 gradually decreases from the center of the rear surface shroud 33 toward the outer periphery, and the resin body 90 is provided with a convex base 91 that replaces the inducer 36 in the above embodiment. Has been.

  That is, the impeller 88 has a ventilation path having a gently convex base 91 at the center, and has an inclined surface from the center toward the outer periphery.

  The operation of the electric blower in the present embodiment configured as described above will be described below.

  When the electric blower 1 is energized and operated and the impeller 88 rotates, air is sucked from the suction port 42 of the casing 40, air flows into the suction port 39 of the impeller 88, and gently enters the surface of the base portion 91 formed. Thus, the traveling direction of the airflow is changed gently and without vortex or disturbance, and the collision loss at the inlet of the impeller 88 can be reduced without an inducer.

  Therefore, since the loss in the impeller 88 on which the inducer of the electric blower 1 is not mounted is reduced, a highly efficient electric blower can be provided at a low cost.

(Embodiment 7)
13 is a plan view and a cross-sectional view of an impeller of an electric blower according to a seventh embodiment of the present invention, FIG. 14 is a perspective view of a blade of the impeller, and FIG. 15 is a plan view showing an assembled state of the impeller. It is. In addition, the same code | symbol is attached | subjected about the same component as the electric blower in the said prior art example and embodiment, and the description is abbreviate | omitted.

  13 to 15, the impeller 99 of the electric blower according to the present embodiment is disposed between a rear shroud 33 made of sheet metal, a front shroud 34 having an inlet 39 in the center, and between the front shroud 34 and the rear shroud 33. It is comprised from the braid | blade 93 made.

  As shown in FIG. 14, the blade 93 includes a blade body 61 made of sheet metal and a resin body 94 that is integrally molded on the outside of the blade body 61. The thickness of the resin body 94 gradually decreases from the center portion of the rear surface shroud 33 toward the outer periphery, and a base portion 91 extends from the resin body 94.

  On the front shroud 34 side, a blade portion 44 having a three-dimensional shape is formed on the extension of the blade body 61 over the air inlet 39 of the impeller 99 and is formed integrally with the base portion 91. As shown in FIG. 15, the blade 93 is disposed between the front shroud 34 and the rear shroud 33 and on the circumference to constitute the impeller 99. That is, the impeller 99 forms a base portion and a blade portion that are originally constituted by the inducer by the resin body 94.

  The operation of the electric blower in the present embodiment configured as described above will be described below.

When the electric blower 1 is energized and operated and the impeller 99 rotates, air is sucked from the suction port 42 of the casing 40, air flows into the suction port 39 of the impeller 99, and the blade portion 44 formed of the resin body 94. In addition, the airflow direction is gently changed on the surface of the base portion 91 that is gently formed, and the direction of the airflow is changed without vortices or disturbances, so that the collision loss at the inlet portion of the impeller 99 can be reduced.

  Therefore, even in the impeller 99 in which the inducer of the electric blower 1 is not mounted, the same effect as the inducer can be obtained and the loss can be greatly reduced, so that a highly efficient electric blower can be provided at a very low cost. is there.

  Moreover, if the electric blower in each said embodiment is mounted in a vacuum cleaner, a cheap and high-performance vacuum cleaner is realizable.

  As described above, in the electric blower according to the present invention, the blade constituting the impeller is integrally formed with the resin, so that high efficiency can be realized at a low cost, such as a vacuum cleaner, other household appliances, and industrial equipment. It is useful for a wide range of uses.

(A) The top view of the impeller of the electric blower in the 1st Embodiment of this invention (b) Sectional drawing of the impeller Perspective view of the blade of the impeller (A) The principal part expanded sectional view (caulking part) of the impeller (b) The principal part enlarged sectional view (parts other than the caulking part) of the impeller The perspective view of the blade body of the impeller of the electric blower in the 2nd Embodiment of this invention Perspective view of the blade of the impeller The perspective view of the blade of the impeller of the electric blower in the 3rd Embodiment of this invention (A) Main part sectional view of the impeller (caulking part) (b) Main part sectional view of the impeller (parts other than the caulking part) The perspective view of the blade of the impeller of the electric blower in the 4th Embodiment of this invention (A) Main part sectional view of the impeller (caulking part) (b) Main part sectional view of the impeller (parts other than the caulking part) (A) The top view of the impeller of the electric blower in the fifth embodiment of the present invention (b) The cross-sectional view of the impeller (c) The cross-sectional view of the blade of the impeller The plan view and cross-sectional view of the impeller shown by the sending machine (A) The top view of the impeller of the electric blower in the 6th Embodiment of this invention (b) Sectional drawing of the impeller Perspective view of the blade of the impeller (A) The top view of the impeller of the electric blower in the 7th Embodiment of this invention (b) Sectional drawing of the impeller Perspective view of the blade of the impeller Plan view showing the assembled state of the impeller Sectional view of the main parts of a conventional electric blower The perspective view of the impeller of the electric blower (A) Plan view of impeller of conventional electric blower (b) Cross section of impeller Perspective view of the blade of the impeller (A) Main part sectional view of the impeller (caulking part) (b) Main part sectional view of the impeller (parts other than the caulking part)

DESCRIPTION OF SYMBOLS 1 Electric blower 31 Electric motor 33 Rear surface shroud 34 Front surface shroud 36 Inducer 37 Protrusion for caulking 38 Caulking hole 39 Inlet port 40 Casing 41 Air guide 42 Inlet port 43, 91 Base portion 44 Blade portion 51 Nut 55, 88, 99 Impeller 60 , 70, 80, 85, 89, 93 Blade 61, 65 Blade body 62, 72, 82, 86, 90, 94 Resin body 66 Opening

Claims (5)

An impeller, an electric motor that drives the impeller to rotate, an air guide that is arranged on the outer periphery of the impeller, regulates the airflow discharged from the impeller, and guides it downstream, and includes the impeller and the air guide and sucks into the center In the electric blower including a fan case having a mouth, the impeller is provided in a front shroud provided with a suction port in the center, a rear shroud opposed to the front shroud, and a central portion of the rear shroud, and has a substantially convex shape. An inducer having a plurality of blade portions on the base portion, and a blade connected between the front shroud and the rear shroud and connected to the blade portion, and the blade is made of metal and is made of a front shroud. And a blade body that is crimped to the rear shroud, and a resin body that is integrally molded on the outer periphery of the blade body. Electric blower according to claim. The electric blower according to claim 1, wherein an R shape is provided on an inner surface of a portion of the resin body that comes into contact with the front shroud and the rear shroud. The electric blower according to claim 1 or 2, wherein the thickness of the resin body on the rotation direction side of the impeller is gradually reduced from the front shroud side to the rear shroud. The thickness of the part which contacts the rear surface shroud of the resin body is gradually reduced from the center side end surface to the outer peripheral side end surface of the impeller, according to any one of claims 1 to 3. Electric blower. The vacuum cleaner provided with the electric blower of any one of Claims 1-4.