JP3052591B2 - 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 used for an electric blower using vacuum pressure, which is used for a vacuum cleaner or the like.

[0002]

2. Description of the Related Art A conventional impeller will be described with reference to FIGS. The impeller 1 includes a front shroud 2 having an umbrella-shaped curved surface, a flat rear shroud 3, and a plurality of blades 4 provided between the two shrouds and curved in an arc shape as viewed from above. . The front shroud 2, the rear shroud 3, and the blade 4 are formed of sheet metal and are integrally caulked with a plurality of caulking projections 5 formed at the upper and lower ends of the blade 4 to form the impeller 1. . Further, the umbrella-shaped curved surface shape of the front shroud 2 is set such that the passage areas surrounded by the front shroud 2, the rear shroud 3, and the blade 4 are the same. 6 is a fan case, 7 is an air guide, 8 is a channel, 9
Indicates a motor.

[0003]

However, the impeller having the above-mentioned conventional structure has the following problems. That is, the front shroud 2 has a curved shape, and a small gap 10 as shown in FIG. On the other hand, when the impeller 1 rotates at a high speed, the flow between the blades 4 becomes as shown in FIG.
With respect to the rotation direction, the flow on the lower side is dense and the flow on the upper side is coarse and dense with a bias, and the pressure difference P ₁ -P ₂
Has occurred. Therefore, the airflow flows around the circumference through the gap 10. This flow collides with the main flow flowing between the blades 4. Therefore, turbulence occurs in the mainstream, and the efficiency of the electric blower decreases. In addition, the flow of this coarse air flow sent out from the impeller 1
Alternately collides with the channel 8 constituting. For this reason,
Fluctuations in pressure in the flow are also a factor in noise.

[0004] This gap is caused by the complicated shape of the curved surface of the shroud 2, which causes variations in mold accuracy. That is, the thickness of the shroud 2 becomes uneven,
This is because the ductility becomes uneven at the time of caulking, and the front shroud 2 becomes a curved surface with distortion.

The flow flowing into the impeller 1 is a turbulent flow that has passed through a filter, a duct hose, and the like of the cleaner body. For this reason, a vortex is generated in the impeller 1, and the airflow cannot efficiently flow between the blades 4. Therefore, the efficiency as the electric blower is further reduced.

Accordingly, the present invention has been made to solve the above-mentioned problems of the conventional structure, and has as its first object to obtain an impeller of an electric blower having a structure in which the blowing efficiency is high and the noise is reduced. It is a second object of the present invention to obtain an impeller of an electric blower having a configuration in which the blowing efficiency is higher and the noise is reduced.

[0007]

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, The one shroud is an impeller of an electric blower which is curved so as to gradually increase the opening area from the inner peripheral portion to the outer peripheral portion of the impeller with respect to the other shroud.

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 the shrouds.
The one shroud is parallel to the other shroud from the inner peripheral portion to the central portion of the impeller, and is curved from the central portion to the outer peripheral portion so as to gradually increase the opening area with respect to the other shroud. And an impeller of the electric blower.

[0009]

The first means of the present invention operates as follows.
By configuring one of the shrouds constituting the impeller to be curved so that the opening area gradually increases from the inner peripheral portion to the outer peripheral portion of the impeller, the flow velocity of the passing airflow can be reduced. Due to the deceleration of the airflow, velocity energy is efficiently replaced with pressure energy. Therefore, the blowing efficiency of the impeller increases. In addition, since the airflow is decelerated, the flow of the coarse airflow that collides with the channel of the air guide itself is decelerated, and the resulting pressure fluctuation is small. Therefore, the generated noise can be reduced.

The second means of the present invention further enhances the function of the first means. That is, the opening area from the inner peripheral portion to the central portion of the impeller is smaller than in the prior art, and the flow speed is increased. Therefore, the unevenness of the flow is suppressed and the flow becomes uniform. For this reason, the pressure difference P ₁ -P ₂ between the blades is reduced, and the flow around the circumference flowing through the gap as seen in the conventional example is reduced. Therefore, the blowing efficiency of the impeller is increased. Further, since the opening area is gradually increased from the central portion to the outer peripheral portion, the flow velocity of the air flow in this portion can be reduced. Therefore, the speed energy can be efficiently replaced with the pressure energy, and the air blowing efficiency of the impeller is further increased. The noise reduction is the same as the first means.

[0011]

FIG. 1 shows an embodiment of the first means of the present invention.
This will be described with reference to FIG. 11 is a front shroud, 12
Is a flat rear shroud. These two shrouds 1
A plurality of blades 13 that are curved in an arc shape when viewed from above are provided between 1 and 12. A plurality of fixing projections 14 are provided on the upper and lower sides of the blade 13, and the fixing projections 14 are caulked to form the impeller 15 by integrating the front shroud 11, the rear shroud 12, and the blade 13. In the present embodiment, the front shroud 11 is shaped so that the opening area gradually increases from the inner peripheral portion to the outer peripheral portion of the impeller 15. In addition,
16 is a fan case, 17 is an air guide, 18 is a channel, and 19 is a motor.

The operation of this embodiment will be described below. Since the front shroud 11 is gradually curved so that the opening area increases from the inner peripheral portion to the outer peripheral portion of the impeller 15, the passing airflow is decelerated as approaching the discharge port 20. By reducing the flow velocity of the air flow, velocity energy of the air flow can be efficiently replaced with pressure energy. Therefore, the blowing efficiency of the impeller 15 is increased.

Further, as the speed of the air flow is reduced, the flow of the coarse air flow which collides with the channel of the air guide 17 itself becomes slow, and the pressure fluctuation caused by this is small. Become. Therefore, the noise generated from the impeller 15 is also reduced.

Next, an embodiment of the second means of the present invention will be described with reference to FIGS. In the present embodiment, the shape of the front shroud 21 forming the impeller 20 is made parallel to the rear shroud 22 from the inner peripheral portion to the central portion, and the opening area gradually increases from the central portion to the outer peripheral portion. It is configured to be curved with respect to the rear shroud 22. The other configuration is the same as that of the above embodiment, and the description is omitted.

The operation of this embodiment will be described below. The front shroud 21 is parallel to the rear shroud 22 from the inner periphery to the center of the impeller 20. Therefore, in this portion, the opening area surrounded by the front shroud 21, the rear shroud 22, and the blade 23 is smaller than that of the conventional one. Therefore, the airflow passing through this portion is accelerated. As a result, the unevenness of the flow is suppressed and the flow becomes uniform, and the pressure difference P ₁ -P ₂ between the blades 23 is reduced. Therefore, the flow around the circumference flowing through the gap, which has conventionally occurred, is reduced. Therefore, the turbulence of the flow between the blades 23 is reduced, and the air flow flows efficiently. Therefore,
This increases the air blowing efficiency of the impeller 20.

The opening area is gradually increased from the central portion to the outer peripheral portion. Therefore, the flow velocity of the air flow in this portion can be reduced, and the velocity energy can be efficiently replaced with the pressure energy. Therefore, the blowing efficiency of the impeller 20 is further increased.

Further, as the speed of the air flow is reduced, the flow of the coarse air flow that collides with the channel of the air guide itself becomes slow, and the pressure fluctuation caused by this is small. . Therefore, impeller 1
The noise from 5 is also low.

[0018]

The first means of the present invention comprises a front shroud, a rear shroud, and a plurality of blades provided between the two shrouds, wherein one of the shrouds is an impeller with respect to the other shroud. As a configuration in which the opening area is gradually increased from the inner peripheral portion to the outer peripheral portion, an impeller of an electric blower having a high blowing efficiency and a low noise level can be realized.

According to a second aspect of the present invention, there is provided a front shroud, a rear shroud, and a plurality of blades provided between the two shrouds, wherein the one shroud extends from an inner peripheral portion of the impeller. The central part is parallel to the other shroud, and the central part is curved so as to gradually increase the opening area from the outer part to the other shroud. This makes it possible to realize a low-level electric blower impeller.

[Brief description of the drawings]

FIG. 1 is a partial side sectional view showing an embodiment of a first means of the present invention.

FIG. 2 is a plan view of the impeller viewed from a front shroud direction.

FIG. 3 is a partial side sectional view showing an embodiment of the second means of the present invention.

FIG. 4 is a plan view of the impeller as viewed from a front shroud direction.

FIG. 5 is a partial side sectional view showing a conventional impeller.

FIG. 6 is a plan view seen from the front shroud direction.

[Explanation of symbols]

 11.21 Front shroud 12.22 Rear shroud 13.23 Blade

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) F04D 29/30 F04D 29/28

Claims (2)

(57) [Claims] 1. A front shroud, a rear shroud, and a plurality of blades provided between the shrouds.
An impeller for an electric blower, wherein the one shroud is curved so as to gradually increase the opening area from the inner peripheral portion to the outer peripheral portion of the impeller with respect to the other shroud. 2. A front shroud, a rear shroud, and a plurality of blades provided between the shrouds.
The one shroud is parallel to the other shroud from the inner peripheral portion to the central portion of the impeller, and is curved from the central portion to the outer peripheral portion so as to gradually increase the opening area with respect to the other shroud. Electric blower impeller.