JP3163739B2 - Electric blower impeller - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an impeller of an electric blower which requires a high vacuum pressure and is used for a vacuum cleaner or the like.

[0002]

2. Description of the Related Art A conventional impeller of this type is shown in FIGS.
This will be described with reference to FIG. The impeller 1 is made of sheet metal, and includes a front shroud 2 having an umbrella-shaped curved surface, a flat rear shroud 3, and a plurality of blade-shaped curved blades 4 clamped therebetween. It is configured. 5 is a fan case covering the impeller, 6 is an air guide, 7 is a motor for driving the impeller, and 8 is an air guide 6
Channel.

[0003]

The impeller of the electric blower having such a configuration has the following problems. The flow of air flowing into the impeller 1 is
The air is turbulent because it passes through the filter, duct hose, etc. of the vacuum cleaner body. Therefore, a circulating vortex a is generated in the impeller 1 as shown in FIG. For this reason, the airflow does not efficiently flow between the blades 4, and the efficiency of the electric blower is reduced.

When the impeller 1 is rotated at a high speed in order to obtain a high vacuum pressure, the flow of air flowing between the blades 4 becomes dense and dense. You will collide. For this reason, pressure fluctuation of the flow occurs, and loud noise is generated.

An object of the present invention is to solve such problems of the conventional structure, and it is a first object of the present invention to provide an impeller of an electric blower having a high air blowing efficiency. It is a second object of the present invention to provide an impeller of an electric blower which suppresses generation of a vortex between blades and has a high blowing efficiency. Further, a third object is to provide an impeller of an electric blower capable of reducing noise.

[0006]

A first means of the present invention for achieving the first object has a front shroud, a rear shroud, and a plurality of blades provided between the shrouds. An impeller of an electric blower having a substantially hemispherical projection provided on a surface of a passage surrounded by the shrouds and the blades.

A second means of the present invention for achieving the second object has a front shroud, a rear shroud, and a plurality of blades provided between both shrouds, wherein the blade has a cross section. This is an impeller of an electric blower having a substantially elliptical shape.

[0008]

The first means of the present invention operates as follows.
In other words, the substantially hemispherical projection provided on the surface of the passage acts so as to generate a small turbulence in the airflow. For this reason, the airflow that has flowed into the passage does not separate, and eddies are less likely to be generated. Thus, the blowing efficiency of the impeller is increased.

According to a second means of the present invention, a blade having a substantially elliptical cross section acts to block circulation of a vortex generated between the blades. For this reason, the air flow is rectified and efficiently flows between the blades, thereby improving the blowing efficiency of the impeller.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The construction of an embodiment of the first means of the present invention will be described below with reference to FIGS. The impeller 11 of the electric blower includes a front shroud 12 having a curved shape, a rear shroud 13 having a flat plate shape, and both shrouds 12, 13.
And a plurality of blades 14 provided between the blades and curved in an arc shape when viewed from above. The front shroud 1
The portion surrounded by the rear shroud 13 and the blade 14 forms an air flow passage 15. Reference numeral 16 denotes a plurality of substantially hemispherical protrusions provided on the surface of the member forming the air flow passage 15. Reference numeral 17 denotes a fan case that covers the impeller 11, 18 denotes an air guide, and 19 denotes a motor that drives the impeller 11.

The operation of the embodiment will be described below. When air flows into the impeller 11, a substantially hemispherical projection 16 is present in the passage 15, so that a small turbulence of the air flow occurs there. For this reason, most of the airflow flowing through the passage 15 is prevented from being separated at the portion of the substantially hemispherical projection 16. Since the formation of the separation is suppressed, the generation of the eddy current is also suppressed. Therefore, in this embodiment, it is possible to provide an impeller for an electric blower having a higher blowing efficiency than the conventional one.

Next, the configuration of an embodiment of the second means of the present invention will be described with reference to FIGS. The impeller 20 of the present embodiment has a blade 21 having a substantially elliptical cross section. Although it is not necessary to provide a plurality of substantially hemispherical projections on the surface of the member forming the airflow passage of the impeller 20 as in the above-described embodiment, a more effective configuration can be obtained. Other configurations are the same as those of the above-described embodiment, and the description is omitted.

The operation of this embodiment will be described below. In this embodiment, the cross section of the blade 21 is substantially elliptical. That is, the interval between the blades 21 in the circumferential direction is not constant, and a wide portion and a narrow portion are formed. For this reason,
As shown in FIG. 4, the airflow b including the turbulent component is blocked from circulating in the circumferential direction, and the generation of the vortex is suppressed. Therefore, according to the present embodiment, it is possible to realize an impeller having high air blowing efficiency as in the above-described embodiment.

[0014]

According to the first means of the present invention, an impeller of an electric blower having a substantially hemispherical projection provided on the surface of an air flow passage can generate a vortex by the substantially hemispherical projection. It is possible to provide an impeller of an electric blower which can be suppressed and has a higher blowing efficiency than before.

According to the second means of the present invention, the impeller of the electric blower having a substantially elliptical cross-sectional shape of the blade is used, so that the generation of the circulating vortex between the blades can be suppressed, and the electric blower with high blowing efficiency can be achieved. Can be provided.

[Brief description of the drawings]

FIG. 1 is a partial sectional view showing an impeller of an electric blower which is an embodiment of a first means of the present invention.

FIG. 2 is a plan view showing the essential parts.

FIG. 3 is a plan view showing an impeller of an electric blower which is an embodiment of the second means of the present invention.

FIG. 4 is a perspective view of a main part for explaining the operation.

FIG. 5 is a partial sectional view showing an impeller of a conventional electric blower.

FIG. 6 is a plan view showing the relevant part.

FIG. 7 is a perspective view of a main part for explaining the operation.

[EXPLANATION OF SYMBOLS] 11 - 2 0 y Npera 1 2 front shroud 1 3 rear shroud 14, 21 blades 15 passage 16 projections

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-2-112699 (JP, A) JP-A-2-140493 (JP, A) JP-A-3-141899 (JP, A) (58) Field (Int.Cl. ⁷ , DB name) F04D 29/28 F04D 29/30

Claims (2)

(57) [Claims] 1. A front shroud, a rear shroud,
An impeller for an electric blower, comprising: a plurality of blades provided between both shrouds; and a substantially hemispherical projection provided on a surface of a passage surrounded by the shrouds and the blades. 2. A front shroud, a rear shroud,
An impeller for an electric blower, comprising: a plurality of blades provided between both shrouds; a cross-sectional shape of the blades being substantially elliptical.