WO2012001861A1

WO2012001861A1 - Impeller, and electric blower and electric cleaner provided with impeller

Info

Publication number: WO2012001861A1
Application number: PCT/JP2011/002643
Authority: WO
Inventors: 哲平秀熊; 西村　剛; 森下　和久; 香山　博之; 中村　一繁
Original assignee: パナソニック株式会社
Priority date: 2010-06-29
Filing date: 2011-05-12
Publication date: 2012-01-05
Also published as: TW201200091A; EP2441962A4; CN102510954A; EP2441962B1; JP2012012937A; EP2441962A1

Abstract

Disclosed is an impeller (1) provided with a front shroud (20) having a first opening (20a) on the center, a rear shroud (21) spaced from the front shroud (20), a plurality of blades (22) which are sandwiched by the front shroud (20) and the rear shroud (21) and which extend from the center toward the outer periphery of the rear shroud (21), and an inducer (23) provided on the center of the rear shroud (21). The inducer (23) is comprised of an upper inducer (24) provided on the front shroud (20) side, and a lower inducer (27) provided on the rear shroud (21) side.

Description

Impeller, and electric blower and vacuum cleaner provided with the impeller

The present invention relates to an impeller, and an electric blower and a vacuum cleaner provided with the impeller.

Conventionally, in an impeller of an electric blower used for a vacuum cleaner, studies have been made to improve the blowing performance (suction performance) of the electric blower. For example, a configuration in which a front shroud, a rear shroud, a blade, and an inducer are provided and a plurality of blades and blades of the inducer are provided has been proposed (see, for example, Patent Document 1).

FIG. 11 is a perspective view with a part cut away for explaining the configuration of such a conventional impeller. As shown in FIG. 11, the impeller 321 includes a rear shroud 322, a front shroud 323, a sheet metal blade 324, and a resin inducer 325. The rear shroud 322 is made of sheet metal. The front shroud 323 is disposed at a distance from the rear shroud 322, and an air inlet 323a is provided at the center. The plurality of sheet metal blades 324 are sandwiched between the rear shroud 322 and the front shroud 323. The resin inducer 325 is provided corresponding to the air inlet 323a.

The resin inducer 325 includes a conical hub 325b and a blade portion 325a formed on the hub 325b. In order to rectify the air flowing from the intake port 323a to the sheet metal blade 324 side, the shape of the blade portion 325a has a three-dimensional curved surface.

FIG. 12A is a plan view showing a mold operation at the time of molding a resin inducer 325 of a conventional impeller 321, and FIG. 12B is a side view thereof.

12A and 12B, the resin inducer 325 is created by resin molding using a side slide mold 331 that slides radially in the outer circumferential direction of the blade portion 325a. The molding die is composed of the same number of side slide dies 331 as the number of blades of the blade portion 325a, and the upper slide die 332 and the lower slide die 333.

In such an impeller 321 of a conventional electric blower, in order to improve the blowing efficiency (suction performance), it is optimal that the number of blade portions 325a and sheet metal blades 324 of the resin inducer 325 be six. It is said that. However, depending on the air volume and the number of rotations, the air blowing efficiency may be improved when the number of blade portions 325a and sheet metal blades 324 is more than six.

In general, high-frequency sound, which is a kind of noise generated by the electric blower, has a frequency that is an integral multiple of the product of the number of blades of the impeller 321 (the number of blade portions 325a and sheet metal blades 324) and the number of rotations. It is known to occur significantly. For this reason, when the number of blades is small, the frequency of the high-frequency sound generated by the electric blower becomes a frequency band that can be easily heard by the user, and may be heard as an irritating sound, which may cause discomfort.

As a method of reducing the high frequency sound, there is a method of reducing the frequency of the high frequency sound away from the frequency band where the user can easily hear by increasing the number of blades of the impeller 321, thereby reducing harsh and unpleasant sound. Yes.

However, in the molding method of the resinous inducer 325 of the impeller 321 of the conventional electric blower described above, the number of blades of the impeller 321 exceeds six and the end surface on the front shroud 323 side of a certain blade portion 325a is adjacent to Molding is difficult when the end surface of the blade portion 325a on the sheet metal blade 324 side overlaps each other when viewed from the top or side surface.

JP 2000-45993 A

The present invention provides an impeller of an electric blower that can easily increase the number of blades of an inducer and increase the air blowing efficiency and is low in noise, and an electric blower and a vacuum cleaner provided with the impeller.

An impeller according to the present invention is sandwiched between a front shroud having a first opening in the center, a rear shroud spaced from the front shroud, a front shroud and a rear shroud, and the center of the rear shroud. A plurality of blades extending from the outer periphery toward the outer periphery, and an inducer provided at the center of the rear shroud. The inducer includes an upper inducer provided on the front shroud side and a lower inducer provided on the rear shroud side.

According to the impeller of the present invention, it is possible to easily increase the number of blades of the inducer, improve the air blowing efficiency, and realize low noise.

FIG. 1 is a partial cross-sectional view illustrating a configuration of an electric blower including an impeller according to a first embodiment of the present invention. FIG. 2 is a perspective view with a part cut away showing the configuration of the impeller in the first embodiment of the present invention. FIG. 3 is an exploded perspective view showing the configuration of the impeller in the first embodiment of the present invention. FIG. 4 is a cross-sectional view showing the configuration of the impeller in the first embodiment of the present invention. FIG. 5A is a plan view showing a mold configuration of a lower inducer of the impeller according to the first embodiment of the present invention. FIG. 5B is a side view showing a mold configuration of the lower inducer of the impeller according to the first embodiment of the present invention. FIG. 6A is a plan view of an upper inducer of the impeller according to the first embodiment of the present invention. FIG. 6B is a side view showing a mold configuration of the upper inducer of the impeller according to the first embodiment of the present invention. FIG. 7 is a cross-sectional view showing the configuration of the impeller in the second embodiment of the present invention. FIG. 8 is a cross-sectional view showing the configuration of the impeller in the third embodiment of the present invention. FIG. 9 is a cross-sectional view showing the configuration of the impeller in the fourth embodiment of the present invention. FIG. 10: is a figure which shows the outline | summary of the vacuum cleaner in the 5th Embodiment of this invention. FIG. 11 is a perspective view with a part cut away for explaining the configuration of a conventional impeller. FIG. 12A is a plan view showing a mold operation during resin-made inducer molding of a conventional impeller. FIG. 12B is a side view showing a mold operation during resin-induced inducer molding of a conventional impeller.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(First embodiment)
The impeller 1 and the electric blower 100 including the impeller 1 according to the first embodiment of the present invention will be described.

FIG. 1 is a partial cross-sectional view illustrating a configuration of an electric blower 100 including an impeller 1 according to a first embodiment of the present invention. FIG. 2 is a perspective view in which a part of the configuration of the impeller 1 according to the first embodiment of the present invention is cut away. FIG. 3 is an exploded perspective view showing the configuration of the impeller 1 according to the first embodiment of the present invention. FIG. 4 is a cross-sectional view showing the configuration of the impeller 1 according to the first embodiment of the present invention.

As shown in FIG. 1, the electric blower 100 includes an impeller 1, an air guide 2, a fan case 3, an electric motor 4, and an anti-load side bracket 6.

The impeller 1 generates an air flow (suction air). The air guide 2 is disposed to face the outer periphery of the impeller 1 and rectifies the airflow discharged from the impeller 1. The fan case 3 contains the impeller 1 and the air guide 2. The electric motor 4 rotationally drives the impeller 1. The anti-load side bracket 6 is provided on the outer periphery of the electric motor 4, and the fan case 3 is attached in an airtight manner.

The impeller 1 is pivotally supported on the shaft 5 of the electric motor 4. The anti-load side bracket 6 is provided with an exhaust opening 7 for exhausting air sucked by the impeller 1.

2 to 4, the impeller 1 includes a front shroud 20, a rear shroud 21, a plurality of blades 22, and an inducer 23.

The front shroud 20 is provided with an air inlet 20a which is a first opening at the center. The rear shroud 21 is disposed at a distance from the front shroud 20. The plurality of blades 22 are sandwiched by the front shroud 20 and the rear shroud 21 and extend from the center of the rear shroud 21 toward the outer periphery of the rear shroud 21. The inducer 23 is provided at the center of the rear shroud 21. The inducer 23 is sandwiched between the front shroud 20 and the rear shroud 21.

A plurality of

fitting protrusions

22a and 22b are provided on the surface of the blade 22 that contacts the front shroud 20 and the rear shroud 21, respectively. Further, the front shroud 20 and the rear shroud 21 are provided with a plurality of

fitting holes

20b and 21a that are fitted to the

fitting protrusions

22a and 22b, respectively. The blade 22 is attached to the front shroud 20 and the rear shroud 21 by inserting the

fitting protrusions

22a and 22b into the

fitting holes

20b and 21a, respectively, and caulking.

The inducer 23 is a surface parallel to the rear surface shroud 21, that is, a surface perpendicular to the shaft 5 of the electric motor 4, and is provided on the upper shroud 20 side and the rear surface shroud 21 side. It is divided into a lower inducer 27. As a result, when the inducer 23 is sandwiched between the front shroud 20 and the rear shroud 21, a force vector applied to the inducer 23 is evenly applied to the split surface between the upper inducer 24 and the lower inducer 27. For this reason, the inducer 23 can be more reliably held by the front shroud 20 and the rear shroud 21.

The inducer 23 has an end face P1 on the front shroud 20 side of a blade part of an inducer 23 and an end face P2 on the blade 22 side of a blade part of an adjacent inducer 23 when viewed from the upper surface or side surface. The shapes overlap each other. That is, it is difficult to mold by the conventional inducer molding method.

As shown in FIGS. 3 and 4, the upper inducer 24 includes a ring portion 25 having a second opening 25 a in the center, and a plurality of pieces extending from the ring portion 25 toward the outer peripheral side of the inducer 23. The first blade portion 26 is configured. The lower inducer 27 includes a base portion 28, a plurality of second blade portions 29, and a shaft portion 30. The base portion 28 is attached to the rear shroud 21 and has a conical shape. The plurality of second blade portions 29 extend from the center portion of the base portion 28 toward the outer peripheral side of the base portion 28. The shaft portion 30 extends from the center portion of the base portion 28 toward the upper inducer 24 and is fitted to the ring portion 25.

As shown in FIG. 4, a third opening 27 a and a fourth opening 21 b that are fitted to the shaft 5 of the electric motor 4 are provided at the center of the lower inducer 27 and the center of the rear shroud 21, respectively. ing. The impeller 1 is rotationally driven by the electric motor 4 when the shaft 5 of the electric motor 4 is inserted into and supported by the third opening 27a and the fourth opening 21b.

As shown in FIG. 3, a convex portion 30a is formed at the end of the shaft portion 30 of the lower inducer 27 on the base portion 28 side. Further, a concave portion 25b that fits with the convex portion 30a is formed at an end portion of the ring portion 25 of the upper inducer 24 on the lower inducer 27 side. The upper inducer 24 is positioned and attached to the lower inducer 27 by the convex portion 30a and the concave portion 25b.

The upper inducer 24 and the lower inducer 27 constitute an inducer 23. The ring portion 25 of the upper inducer 24 is fitted to the shaft portion 30 of the lower inducer 27 and positioned and attached to the lower inducer 27. Thereby, the upper inducer 24 and the lower inducer 27 can be more reliably held with a simple configuration.

Further, the first blade portion 26 of the upper inducer 24 and the second blade portion 29 of the lower inducer 27 constitute a blade portion of the inducer 23.

As shown in FIG. 4, the ring portion 25 of the upper inducer 24 and the shaft portion 30 of the lower inducer 27 are the ring portion 25 of the upper inducer 24 in a state where the upper inducer 24 is attached to the lower inducer 27. The outer peripheral surface P3 and the front shroud 20 side surface P4 of the base portion 28 of the lower inducer 27 are formed to be the same surface.

In the present embodiment, the number of first blade portions 26 of the upper inducer 24, the number of second blade portions 29 of the lower inducer 27, and the number of blades 22 are determined based on the air volume and impeller of the electric blower 100. From the viewpoint of the number of rotations of 1, the number is nine.

In the present embodiment, the front shroud 20, the rear shroud 21, and the blade 22 are made of metal, and the inducer 23 is made of resin.

A method of forming the inducer 23 configured as described above will be described.

FIG. 5A is a plan view showing a mold configuration of the lower inducer 27 of the impeller 1 according to the first embodiment of the present invention. FIG. 5B is a side view showing the mold configuration. FIG. 6A is a plan view of the upper inducer 24 of the impeller 1 according to the first embodiment of the present invention. FIG. 6B is a side view showing a mold configuration of the upper inducer 24 of the impeller 1 according to the first embodiment of the present invention.

As shown in FIGS. 5A and 5B, the mold of the lower inducer 27 is configured at a 40-degree angular interval, a slide mold 31 arranged in nine directions, and a core 32 that molds the lower inducer 27 from above. And a cavity 33 for molding the lower inducer 27 from below.

In the inducer 23, an end surface P1 on the front shroud 20 side of a blade portion of an inducer 23 and an end surface P2 on the blade 22 side of a blade portion of an adjacent inducer 23 overlap each other when viewed from the top or side. However, it is divided into two parts, an upper inducer 24 and a lower inducer 27, and has a shape that can be molded by the above-described mold structure.

As shown in FIGS. 6A and 6B, the mold of the upper inducer 24 includes a core 42 that molds the upper inducer 24 from above and a cavity 43 that molds the upper inducer 24 from below. Yes.

As described above, it is difficult to increase the number of blades of the inducer 23 by the conventional configuration and molding method. However, as shown in the present embodiment, the inducer 23 can be molded by dividing it into two parts, an upper inducer 24 and a lower inducer 27. By combining these two parts when the impeller 1 is assembled, a multi-blade shape can be realized. For this reason, the inducer 23 can be easily multi-bladed, the air blowing efficiency of the electric blower 100 can be improved, and noise reduction can be realized.

Moreover, since the inducer 23 is sandwiched between the front shroud 20 and the rear shroud 21, the inducer 23 can be reliably held with a simple configuration. Further, as described above, it is possible to easily realize the multi-blade of the inducer 23. Therefore, by using the impeller 1 of the present embodiment, it is possible to improve the air blowing efficiency of the electric blower 100 and to reduce noise.

(Second Embodiment)
Next, the impeller 51 in the second embodiment of the present invention will be described.

FIG. 7 is a cross-sectional view showing the configuration of the impeller 51 in the second embodiment of the present invention.

In addition, about the component which is the same as that of the impeller 1 of 1st Embodiment mentioned above, or equivalent, attaches the same code | symbol and the description is abbreviate | omitted.

As shown in FIG. 7, the front shroud 20 has a front shroud 20 of the first blade portion 26 and the second blade portion 29 at a position where it abuts with the first blade portion 26 and the second blade portion 29. A groove 34 having substantially the same shape and the same width as the abutting end surface is provided over the entire circumference.

Thereby, the inducer 23 can be more securely held on the front shroud 20 with a simple configuration. Further, warp deformation of the first blade portion 26 and the second blade portion 29 caused by internal stress or the like generated when the inducer 23 is molded can be corrected by the groove portion 34 of the front shroud 20.

Also by using the impeller 51 of the present embodiment, it is possible to easily realize the multi-blade of the inducer 23. Therefore, the air blowing efficiency of the electric blower 100 can be improved and noise reduction can be realized.

(Third embodiment)
Next, an impeller 52 according to a third embodiment of the present invention will be described.

FIG. 8 is a cross-sectional view showing the configuration of the impeller 52 in the third embodiment of the present invention. In addition, the same code | symbol is attached | subjected about the component which is the same as that of the

impellers

1 and 51 of 1st Embodiment mentioned above, and 2nd Embodiment, and equivalent, and the description is abbreviate | omitted.

As shown in FIG. 8, the second blade 29 is provided with a protrusion 29 a extending from the end surface of the second blade 29 that contacts the front shroud 20 toward the front shroud 20. In addition, a hole 20c that fits with the protrusion 29a is provided at a position facing the protrusion 29a of the front shroud 20. The inducer 23 is fixed to the front shroud 20 by inserting and welding the projections 29a of the second blade portion 29 into the holes 20c of the front shroud 20.

Thereby, since the inducer 23 can be more reliably held on the front shroud 20 with a simple configuration, it is possible to easily realize a multi-blade of the inducer 23. Thereby, also by using the impeller 52 of the present embodiment, it is possible to improve the blowing efficiency of the electric blower 100 and to reduce the noise.

In addition, in this Embodiment, although the structure in which the projection part 29a was provided in the 2nd blade | wing part 29 was demonstrated, this invention is not limited to this structure. For example, the protruding portion 29 a may be provided on the first blade portion 26, or may be provided on both the first blade portion 26 and the second blade portion 29. Even in these configurations, the inducer 23 can be held on the front shroud 20 more reliably with a simple configuration, so that the increase in the number of the blades of the inducer 23 can be easily realized. Therefore, the air blowing efficiency of the electric blower 100 can be improved and noise reduction can be realized.

(Fourth embodiment)
Next, an impeller 53 according to a fourth embodiment of the present invention will be described.

FIG. 9 is a cross-sectional view showing the configuration of the impeller 53 according to the fourth embodiment of the present invention. FIG. 9 shows a cross-sectional configuration near the center of the impeller 53.

Also in this embodiment, components that are the same as or equivalent to the

impellers

1, 51, and 52 shown in the first to third embodiments are denoted by the same reference numerals, and Description is omitted.

As shown in FIG. 9, a claw portion 30 b that engages with an end surface of the ring portion 25 of the upper inducer 24 on the front shroud 20 side is provided at the end portion of the shaft portion 30 of the lower inducer 27 on the front shroud 20 side. It has been.

Thereby, since the upper inducer 24 can be more securely held in the axial direction with respect to the lower inducer 27, it is possible to easily realize the multi-blade of the inducer 23. Thereby, also by using the impeller 53 of the present embodiment, it is possible to improve the blowing efficiency of the electric blower 100 and to reduce noise.

(Fifth embodiment)
Next, the vacuum cleaner 200 in the 5th Embodiment of this invention is demonstrated.

FIG. 10 is a diagram showing an outline of the electric vacuum cleaner 200 according to the fifth embodiment of the present invention. Also in the present embodiment, the same or corresponding components as those described in the first to fourth embodiments are denoted by the same reference numerals, and the description thereof is omitted.

As shown in FIG. 10, the electric vacuum cleaner 200 includes a cleaner body 201, a suction tool 202 that sucks dust on the surface to be cleaned, a hose 203 having one end connected to the cleaner body 201, and a hose 203 at one end. The other end of the extension pipe 204 is connected to the suction tool 202. A hand operation unit 205 is provided at the end of the hose 203 on the extension tube 204 side.

The vacuum cleaner main body 201 includes any one of the

impellers

1, 51, 52, and 53 described in the first to fourth embodiments, and the electric blower 100 that generates suction air. The dust collector 206 is disposed upstream of the electric blower 100 and collects dust.

The operation and action of the vacuum cleaner 200 configured as described above will be described.

When the user holds the hand operating unit 205 and starts the operation of the electric vacuum cleaner 200, the electric blower 100 generates suction air and generates suction power. When the user moves the suction tool 202 on the surface to be cleaned in this state, dust on the surface to be cleaned is sucked together with air from the suction tool 202.

The sucked dust and air flow into the dust collecting unit 206 through the extension pipe 204 and the hose 203, dust and air are separated by the dust collecting unit 206, and only dust is collected by the dust collecting unit 206. . The air after the dust is separated is sucked by the electric blower 100, passes through the electric blower 100, passes through the cleaner main body 201, and is discharged to the outside of the cleaner main body 201.

The vacuum cleaner 200 according to the present embodiment incorporates the electric blower 100 having the

impellers

1, 51, 52, and 53 described in the first to fourth embodiments described above. A vacuum cleaner with high performance and low noise can be realized. Therefore, the user can clean comfortably by using the electric vacuum cleaner 200 in the present embodiment.

The impeller of the present invention is not limited to the configuration of the

impellers

1, 51, 52, and 53 described in the above embodiments.

For example, in the first to fourth embodiments of the present invention, the number of first blade portions 26, the number of second blade portions 29, and the number of blades 22 are nine. As explained. However, the impeller of the present invention is not limited to this configuration. The number of first blade portions 26, the number of second blade portions 29, and the number of blades 22 can be suitably determined from the viewpoint of the air volume of the electric blower and the rotational speed of the impeller.

As described above, according to the impeller of the present invention, and the electric blower and vacuum cleaner provided with the impeller, the blades of the inducer can be easily multi-bladed, and the blowing efficiency can be improved. Therefore, the suction performance of the electric blower can be improved and noise reduction can be realized.

Furthermore, the suction power of the vacuum cleaner can be improved, and a low-noise vacuum cleaner can be realized. Therefore, the present invention is useful as household electrical appliances, industrial equipment, and the like that use an electric blower.

1, 51, 52, 53 Impeller 2 Air guide 3 Fan case 4 Electric motor 5 Shaft 6 Anti-load side bracket 7 Exhaust opening 20 Front shroud 20a Inlet (first opening)
20b, 21a fitting hole 20c hole 21 rear surface shroud 21b fourth opening 22

blade

22a, 22b fitting projection 23 inducer 24 upper inducer 25 ring 25a second opening 25b recess 26 first Blade part 27 Lower inducer 27a Third opening 28 Base part 29 Second blade part 29a Projection part 30 Shaft part

30a Projection part

30b Claw part 31

Slide mold

32, 42

Core

33, 43 Cavity 34 Groove part 100 Electric blower DESCRIPTION OF SYMBOLS 200 Vacuum cleaner 201 Vacuum cleaner main body 202 Suction tool 203 Hose 204 Extension pipe 205 Hand operation part 206 Dust collection part

Claims

A front shroud having a first opening in the center;
A rear shroud spaced from the front shroud;
A plurality of blades sandwiched between the front shroud and the rear shroud and extending from the center of the rear shroud toward the outer periphery;
An inducer provided at the center of the rear shroud,
The inducer is an impeller comprising an upper inducer provided on the front shroud side and a lower inducer provided on the rear shroud side.
The impeller according to claim 1, wherein the inducer is sandwiched between the front shroud and the rear shroud.
The impeller according to claim 1, wherein the inducer is divided into the upper inducer and the lower inducer on a plane parallel to the rear shroud.
The upper inducer is
A ring portion having a second opening in the center;
A plurality of first blade portions extending from the ring portion toward the outer peripheral side of the inducer,
The lower inducer is
A base attached to the rear shroud;
A plurality of second blade portions extending from the center portion of the base portion toward the outer peripheral side of the base portion;
2. The impeller according to claim 1, wherein the impeller includes a shaft portion that extends from a center portion of the base portion toward the upper inducer and is fitted to the ring portion.
The impeller according to claim 4, wherein a groove portion is provided over the entire circumference of the front shroud at a position where the front shroud contacts the first blade portion and the second blade portion.
At least one of the first blade portion and the second blade portion is provided with a protrusion extending from the first blade portion and the second blade portion toward the front shroud side,
The front shroud is provided with a hole for fitting with the protrusion,
The impeller according to claim 4, wherein the inducer is fixed to the front shroud by inserting the protrusion into the hole and welding the protrusion.
The impeller according to claim 4, wherein a claw portion that is fitted to the ring portion of the upper inducer is provided on the shaft portion of the lower inducer.
An electric motor,
The impeller according to any one of claims 1 to 7,
An electric blower.
A vacuum cleaner body containing the electric blower according to claim 8;
A vacuum cleaner comprising a suction tool for sucking dust on a surface to be cleaned.