JP2666491B2 - Centrifugal blower impeller - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an impeller of a centrifugal blower in an electric blower used for an electric vacuum cleaner or the like.

2. Description of the Related Art A conventional electric blower of this type will be described with reference to FIGS.

In the figure, 1 is a motor, 2 is a rotating shaft thereof, and 3 is an impeller fixed to the rotating shaft 2. 4 is an air guide located on the outer periphery of the impeller 3 and 5 is an impeller 3 and an air guide 4
And is press-fitted and fixed to the motor bracket 6. Reference numeral 7 denotes an intake port formed in the casing 5. Reference numeral 8 denotes an impeller-side bearing, and reference numeral 9 denotes a bearing holding portion on the opposite side.

The impeller 3 includes a front shroud 10 and a rear shroud.
A plurality of blades 12 are arranged between them.

Problems to be Solved by the Invention In the impeller 3 having such a configuration, the following is focused on the internal flow. That is, the airflow caught between the blades 12 at the time of high-speed rotation receives a radial force due to centrifugal force, and becomes a biased flow as a whole pressed against the front shroud 10 side, which lowers the efficiency as a blower It was one of the causes.

Therefore, the present invention solves such a problem that such a biased flow is generated on the front shroud side, and aims to obtain an electric blower having a high blowing efficiency by eliminating the bias of the airflow inside the impeller. The purpose is.

Means for Solving the Problems And in order to achieve the above-mentioned object, the present invention mixes a blade connected to both shrouds as a height of the blade and a blade whose upper end is located in an intermediate portion between the two shrouds. Things. In addition, the inner end of the low-height blade is located halfway in the flow direction of both shrouds.

Operation The operation of this technical means is as follows.

In other words, in places where uneven flow is likely to occur inside the impeller, blades of different lengths and heights will strengthen the flow in the uneven part, and as a result, the flow will be homogenized as a whole and as a result, the blowing efficiency Is improved.

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

1 and 2, 13 is a front shroud, 14 is a rear shroud, and blades 15 and 16 are arranged therebetween to form an impeller 17. One blade 15 has a height at which its upper and lower ends are coupled to both shrouds 13 and 14, and the other blade 16 rises from the rear shroud 14 and its upper end is located substantially in the middle between the two shrouds 13 and 14. I have.

The flow inside the impeller 17 having the above configuration is as follows. That is, the rotation causes the internal air to be pushed in the radial direction due to the centrifugal force, and the air flow as a whole tends to be deflected to the front shroud 13 side.
Since the air in the vicinity of 14 acts to receive the centrifugal force, the flow which was about to be deflected to the front shroud 13 side is guided to the rear shroud 14 side. As a result, the flow inside the impeller 17 becomes uniform.

3 and 4 show a second embodiment. That is, in FIGS. 3 and 4, the blade 16 having a low height is shortened even on the inner end side, and is positioned halfway in the flow direction of both blades 13 and 14. In this example, the short blade 16
Since there is no near the inlet of the impeller 17, there is little turbulence near the inlet 18 where the centrifugal force is given a relatively small way, so that there is a lot of air near the inlet 18 And becomes uniform as an internal flow.

Effect of the Invention As described above, in the electric blower of the present invention,
This prevents the flow inside the impeller from flowing toward the front shroud side, thereby improving the air blowing efficiency.

[Brief description of the drawings]

1 is a sectional view of an impeller of an electric blower according to an embodiment of the present invention, FIG. 2 is a partially cutaway top view, FIG. 3 is a sectional view showing another embodiment, and FIG. 5 is a partially cutaway sectional view of a conventional electric blower, FIG. 6 is a sectional view of the impeller, and FIG. 7 is a plan view of the same. 13 ... front shroud, 14 ... rear shroud, 15, 16
…… Blade, 17 …… An impeller.

Claims (2)

(57) [Claims] 1. A blade comprising a plurality of blades disposed between a front shroud and a rear shroud, the blades having upper and lower ends connected to both shrouds;
An impeller of a centrifugal blower in which one that protrudes from the rear shroud and whose upper end is located approximately in the middle between the two shrouds is mixed. 2. An impeller for a centrifugal blower according to claim 1, wherein the inner end of the blade whose upper end is located substantially in the middle between the two shrouds is located halfway in the flow direction between the two shrouds.