JP2803482B2 - 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 a blower such as an air conditioner.

[0002]

2. Description of the Related Art An air conditioner blower comprises a motor and an impeller. As this impeller, there is a conventional one as shown in FIG. 5 (JP-A-3-15619). The shaft portion 12b of the hub 12 of the impeller 2 is
And fixed with a nut 3 to the cylindrical portion 12 of the hub 12.
A plurality of blades 13,..., 13 are provided on the outer peripheral surface of a. The cylindrical portion 12a and the shaft portion 12b are connected by a rib 12d extending in the axial direction and a plate portion 12g extending in a direction perpendicular to the axis. The plate portion 12g is connected to the end of the tubular portion 12a and is located at a position farthest from the front edge 13e of the root portion of the blade 13.

[0003]

In the case where the impeller 2 is used for an outdoor fan of an air conditioner, when each blade 13 is exposed to a strong wind such as a typhoon, the blades 13 generate centrifugal force due to high-speed rotation by the strong wind. Receiving it is strongly pulled outward. At this time, a large force is applied to the front edge of the root portion of the blade 13, but the inside of the cylindrical portion 12 to which the blade 13 is fixed is reinforced only by the rib 12 d and the plate portion 12 g is separated from the front edge. As shown in FIG. 6, there is a problem that a crack a is generated from the front edge 13e of the root of the blade 13 to one end 2f of the hub 12, and the blade 13 is broken therefrom.

As shown in FIGS. 7 and 8, when the impeller 2 is transported, a plurality of the impellers 2 are stacked one on top of the other and packed. 2 are displaced around the axis, and the blades 13 of the upper and lower impellers 2
However, there is a problem that they come into contact with each other and break.

Accordingly, an object of the present invention is to provide an impeller of a blower which can prevent the impeller from being damaged even when receiving a strong wind and can prevent the damage during transportation.

[0006]

In order to achieve the above object, an impeller of a blower according to the present invention comprises a tubular portion 10a and a plate portion extending radially inward and circumferentially from the inside of the tubular portion 10a. 10c, and a hub having a blade 20 integrally connected to an outer peripheral surface of a cylindrical portion 10a of the hub 10, the hub being close to a front edge 20d of a root portion of the blade 20. An axially protruding projection 10i is provided at one end 10h of the ten cylindrical portions 10a,
The other end portion 10j of the hub 10a is provided with a concave portion 10k into which a convex portion of another impeller having the same shape and arrangement as the convex portion 10i is fitted.

[0007]

According to the first aspect, the leading edge 2 of the root portion of the blade 20 is provided.
By providing a protrusion 10i at one end 10h of the hub 10 close to the leading edge 2d of the blade 20,
0d and one end 10h are reinforced, and the leading edge 20
No crack is generated from d to one end 10h of the hub 10. Also, a concave portion 10k into which the convex portion 10i of another impeller having the same shape is fitted to the other end portion 10j of the hub 10.
Is provided, when a plurality of impellers w are stacked up and down, the protrusions 10i and the recesses 10k are fitted to each other so that the impellers w are not displaced around the axis, and the blades 20 are not damaged during transportation.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the illustrated embodiments. FIG. 1 shows a first reference example serving as a basis of this embodiment. An impeller V made of a synthetic resin according to the first reference example is integrally formed with a cylindrical hub 10 and an outer peripheral surface of the hub 10. And a plurality of linked blades 20. The above hub 10
A cylindrical portion 10a, a shaft portion 10e, a plurality of ribs 10f extending in the axial direction connecting the inner surface of the tube portion 10a and the shaft portion 10e, an inner surface of the tube portion 10a and the shaft portion 10e.
e and a plate portion 10c extending in a direction perpendicular to the axis.

The plate portion 10c of the hub 10 is
It is connected to the entire inner circumference of the cylindrical portion 10a near the front edge 20d at the root of the zero. Incidentally, the plate portion 12g of the conventional hub 12a shown in FIG. 5 is provided further rearward than the rear edge 13h of the root portion of the blade 13.

[0010] As shown in FIG.
0e is fitted with the rotating shaft 11a of the motor 11 and the nut 1
It is fixed at 2.

In the second embodiment shown in FIG. 2, the plate 10g of the hub 10 is bent in the axial direction so as to have a cylindrical portion, and the outer peripheral end of the plate 10c is It is connected to the cylindrical portion 10a near the front edge 20d of the root portion. Other configurations of the second reference example are the same as those of the first reference example, and thus the same components are denoted by the same reference numerals and description thereof will be omitted.

According to the configurations of the first and second reference examples,
Since the outer peripheral end of the plate portion 10c of the hub 10 is provided so as to be continuous with the front edge 20d of the root portion of the blade 20 of the impeller V,
The cylindrical portion 1 near the front edge 20d of the blade 20 is formed by the plate portion 10c.
0a is reinforced.

Therefore, the impeller V is exposed to strong wind,
Even if the blade 20 receives a large centrifugal force and is pulled outward by high-speed rotation by strong wind, no crack is generated from the front edge 20d of the blade 20 to one end 10h of the cylindrical portion 10a of the hub 10, and the blade is broken therefrom. Accident can be prevented.

FIGS. 3 and 4 show an impeller W according to an embodiment of the present invention, in which the plate portion 10c is replaced with the conventional plate portion 12 shown in FIG.
g, one end 10h of the cylindrical portion 10a of the hub 10 close to the front edge 20d of the root of the blade W.
The hub 10 is provided with a trapezoidal projection 10i protruding in the axial direction, and the other end 10j of the cylindrical portion 10a of the hub 10 is provided with a recess 10k into which the projection 10i of another blade W fits.

According to the configuration of the above embodiment, the convex portion 10i is provided at one end 10h of the cylindrical portion 10a of the hub 10 close to the front edge 20d of the root of the blade 20 of the impeller W.
The front edge 20d and one end 10h of the blade 20 are
Is reinforced.

Therefore, the impeller W is exposed to strong wind,
Even if the blades 20 are pulled outward by a large centrifugal force due to high speed rotation due to strong wind, cracks will not occur from the leading edge 20d of the blades 20 to one end 10h of the hub 10, and the accident that the blades will be damaged from there will be prevented. Can be prevented.

When the impellers W are vertically stacked as shown in FIG. 4, the projections 10i of the upper impeller W fit into the recesses 10k of the lower impeller W. Thus, an accident in which the stacked impellers W do not shift around the axis and the blades 20 of the upper and lower impellers W come into contact with each other and are damaged can be prevented beforehand.

When the protrusion 10i of the embodiment is provided in the configuration of the first and second reference examples, the vicinity of one end 10h of the hub 10 is further strengthened. Further, although the above-described embodiment is an axial impeller, it is needless to say that the embodiment can be applied to an impeller for oblique flow, centripetal operation, and the like.

[0019]

As is apparent from the above description, the impeller of the blower according to the first aspect of the present invention projects axially at one end of the cylindrical portion of the hub close to the front edge of the blade root. Since the protrusion is provided, the connection between the blade and the one end can be reinforced by the protrusion, no crack is generated from the front edge to one end of the hub, and a breakage accident in a strong wind can be prevented beforehand. Furthermore, since the other end of the hub is provided with a concave portion into which the convex portion of another impeller fits, when the impellers are stacked up and down, the impeller rotates around the axis due to the fitting of the convex portion and the concave portion. It is possible to prevent damage during transportation.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of an impeller of a blower according to a first reference example of the present invention.

FIG. 2 is a sectional view of an impeller of a blower according to a second reference example of the present invention.

FIG. 3 is a front view of the impeller of the blower according to the embodiment of the present invention.

FIG. 4 is a side view showing a state in which the impellers of FIG. 3 are stacked.

FIG. 5 is a sectional view of a conventional impeller.

FIG. 6 is a side view showing the relationship between the blades and the hub of the impeller of FIG. 5;

FIG. 7 is a front view of the impeller of FIG. 5;

FIG. 8 is a side view showing a state where the impellers of FIG. 5 are stacked.

[Explanation of symbols]

V, W: impeller, 10: hub, 10a: cylindrical part, 10c ...
Plate part, 10h one end, 10i convex part, 10j other end part, 10k concave part, 11 motor, 11a rotary shaft 20
... feather, 20d ... leading edge.

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) F04D 29/18-29/38

Claims (1)

(57) [Claims] 1. A tubular portion (10a) and a plate portion (10) extending radially inward and circumferentially from the inside of the tubular portion (10a).
c) and a vane (20) integrally connected to the outer peripheral surface of the cylindrical portion (10a) of the hub (10).
An end portion (10h) of a cylindrical portion (10a) of the hub (10) which is close to a front edge (20d) of a root portion of the blade (20).
A protrusion (10i) protruding in the axial direction is provided on the other end (10j) of the hub (10a), and a protrusion of another impeller having the same shape and arrangement as the protrusion (10i). Characterized by being provided with a concave portion (10k) into which the fitting is fitted.