JPS628399Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a blower, and more specifically, to a blower with an improved impeller assembly.

The assembly of a conventional blower impeller is shown in FIG. In the figure, the support plate 3 is inserted and placed on the stepped part of the rotating shaft 13, and the impeller 1 is placed on it.
A plate 1 of 4 is sandwiched between fixing plates 2 and fixed by tightening with a nut 5 via a spring washer 4. Since both the supporting plate 3 and the fixing plate 2 are flat, the following drawbacks occurred when the impeller 14 was assembled.

First, when the nut 5 is tightened through the spring washer 4, the plate 1 of the impeller 14 is tightened.
The force that clamps the spring washer 4 does not act uniformly on the entire plane of the fixed plate 2 and the support plate 3.
It is strong near the point where it touches, and becomes weaker as it moves toward the periphery. For this reason, there is a drawback that the nut 5 is easily loosened due to vibration, moment of inertia, etc. Further, when the impeller 14 is moved during rotation, such as in a vacuum cleaner, a gyroscope effect is exerted on the impeller 14, which may cause the impeller 14 to tilt and interfere with a fan cover (not shown).

Secondly, if the fixed plate 2 and the support plate 3 warp and the plane accuracy deteriorates, or if the nut accuracy deteriorates, there is a risk that the impeller 14 will be assembled at an angle. For this reason, when the impeller 14 rotates, vibration is generated, which may interfere with the fan cover or the like.

The present invention has been made to overcome the above-mentioned drawbacks of this type of blower.

An object of the present invention is to provide a blower with improved impeller assembly so that it does not easily loosen and the impeller does not easily tilt.

Another object of the present invention is to provide an inexpensive blower configured to stably support and fix the impeller.

The above object of the present invention is to use an embossed plate for at least one of the fixing plate and the supporting plate so as to create a space in the center of the plate side of the impeller and a contact area on the outer periphery when assembling the impeller. achieved by.

The invention will now be described with reference to the accompanying drawings showing preferred embodiments thereof.

FIG. 2 is a central vertical sectional view of the impeller portion of the blower according to the present invention, showing the assembled state of the impeller. The figure is different from FIG. 1 in that the shapes of the fixed plate 11 and support plate 12 and the rotating shaft 13 are longer, but the other assembly conditions are the same.

The fixed plate 11 and the support plate 12 are generally disk-shaped with approximately the same diameter, and a circular embossment is made in the center so as to create spaces 7 and 10 on both sides of the plate 1 when the impeller 14 is assembled. ing. Flange portions 8 and 9 in contact with this plate 1
forms a band-shaped ring, and the band-shaped rings are of the same size and are opposite at the top and bottom.

Therefore, when the impeller 14 is clamped and tightened with the nut 5 via the spring washer 4, the tightening force in the rotational axis direction is transmitted to the flange portions 8 and 9 of the fixed plate 11 and the support plate 12, respectively, and the belt-shaped ring is tightened. Plate 1 of impeller 14 at flange parts 8 and 9
is firmly tightened.

As a result, even if the same material as the conventional fixing plate 2 and supporting plate 3 (that is, material with the same friction coefficient) is used, the fixing plate 11 and supporting plate 12 of the present invention can be tightened at a position far from the center of rotation. Since the tightening area is large in the form of a belt-like ring, it can sufficiently withstand the moment that loosens the tightening of the nut 5 due to vibrations, inertia, etc. Furthermore, since the embossed portion has appropriate elasticity in the axial direction, it will not easily loosen due to vibrations, inertia, etc.

The parts of the fixed plate 11 and the support plate 12 are less likely to warp, and since the plate 1 of the impeller 14 is clamped at a location far from the center, there is an advantage that tilting is less likely to occur during assembly.

Furthermore, since the plate 1 is tightened far from the center, the gyro effect is greatly suppressed, and the inclination of the impeller 14 is further reduced. Therefore, there is no possibility of interference with the fan cover or the like.

Also, as shown in FIGS. 3 and 4, if one of the fixing plate 11 and supporting plate 12 that sandwich the plate 1 is replaced with the conventional flat plate fixing plate 2 or supporting plate 3, the result will be better than before. Good effects can be achieved.

From the above explanation, it has become clear that it is possible to provide a blower with an improved impeller assembly at a low cost so that it does not easily loosen and the impeller does not easily tilt.

[Brief explanation of the drawing]

FIG. 1 is a central longitudinal cross-sectional view of a conventional impeller attachment part, FIG. 2 is a central longitudinal cross-sectional view of an impeller attachment part according to the present invention, and FIGS. 3 and 4 are similar views showing other embodiments. It is a drawing. In the figure, 1... plate, 2, 11... fixed plate,
3, 12... Support plate, 4... Spring washer, 5... Nut, 7, 10... Space, 8, 9...
...Flange portion, 13...Rotating shaft.

Claims (1)

[Scope of utility model registration request] A blower comprising a support plate which supports an impeller on a rotating shaft, and a fixed plate which clamps and fixes the impeller together with the support plate, the support plate and the fixed plate being disk-shaped and of approximately the same diameter, and at least one of the plates being embossed so as to make a space on the plate side of the impeller when assembled and to come into contact with the plate at its outer periphery.