JPS60198399A - Impeller - Google Patents

Abstract

PURPOSE:To aim at enhancing the strength of an impeller, by dividing a blade in the impeller into two parts in the direction in which the blade is cylindrically extended, so that either one of the divided parts may be welded to plate members opposing the former from the inner and outer surface sides of the divided part. CONSTITUTION:A blade having a cylindrical air-foil shape of a stream line type is divided into a flank plate section 8 including the leading end part 8A of the blade, and a back plate section 7, and the flank plate section 8 is secured to a main plate 1 and side plates from the inner and outer surface sides of the blade by welding 5A, 5B. Therefore, no unwelded parts exsist in the securing sections between the flank plate section 8 and the main plate 1 or the side plates so that the fatigue strength of the blade may be enhanced, thereby it is possible to aim at enhancing the strength of the high torque stress section of the blade.

Description

[Detailed description of the invention] <Technical field of invention> The present invention relates to an impeller in a blower or the like.

<Prior Art> As a conventional blower, one is known that includes an impeller having a configuration in which streamlined cylindrical airfoil-shaped blades are fixed between opposing plate members.

The minus side structure of this will be explained based on FIGS. 1 to 6. 1 is a main plate, 2 is a side plate, and 3 is a blade.

The blade 3 has a streamlined cylindrical airfoil shape as shown in FIG. Yes, it is molded as a single piece, assembled by welding, and then fixed to the main plate 1 and side plate 2 by welding.

Since the blades 3 of such an impeller are cylindrical, when their ends are welded to the main plate 1 and the side plate 2 as shown in FIGS. 4 and 5, as shown in the welded metal part 5. Welding can only be performed from the outer circumferential side of the end of the blade 3. For this reason, as shown in FIG.
is inevitable.

When the unwelded portion 6 is formed in this manner, the fatigue strength of the portion of the impeller where the rotational stress is particularly high is significantly reduced as shown by A in FIG. 10.

<Summary of the Invention> Therefore, in view of the above-mentioned conventional situation, the present invention divides a blade into two in the direction in which it extends in a cylindrical shape, and welds one of the divided bodies to the opposing plate member. The purpose is to eliminate unwelded parts and improve strength by creating a configuration that allows the welding to be performed from both the inner and outer surfaces of the divided body.

<Embodiment of the Invention> Hereinafter, an embodiment of the present invention will be described based on FIGS. 7 to 10.

In FIGS. 7 and 8, the blade having a streamlined cylindrical airfoil is divided into a belly plate part 8 including a wing head 8A and a back plate part 7. 4 is fixed to the inner surface of the back plate part 7.
9 is a window formed along the edge of the wing head 8A side of the belly plate 8 and the lip 4 of the back plate 7, and 10 is a window 9 which is closed from the outside side. This is a window board.

Such a blade is assembled by separately welding the belly plate part 8 and the back plate part 7 to the main plate 1 and the side plates 2 as shown in FIG.

In this case, first, as shown in FIG. 9, the belly plate part 8 is welded from its inner and outer sides (welded metal parts 5A, 5B).
The main plate 1 and the side plates (not shown) are then fixed together by welding.Then, as shown in FIG. ) to the main plate 1 and the side plates, and to the belly plate 8 by welding.Next, the lip 4 and the belly plate 8 are welded using the window 9 of the back plate T. Finally, weld around each window portion 9 on the outer surface of the back plate portion 7, which is the window plate 10,
The window portion 9 is closed.

Therefore, as a result of fixing the belly plate part 8 to the main plate 1 and the side plates by welding from both the inner and outer sides of the belly plate part 8 to the main plate 1 and the side plates as described above, the fixed part between the belly plate part 8 and the main plate 1 and the side plates There is no unwelded part, and the fatigue strength of this part is improved as shown in B in FIG. In particular, the rotational stress of a single impeller is usually high at the blade head and vent side, so it is very effective to improve the strength by welding the belly plate 8 from both sides. As a result of the improved strength, the impeller can be made faster and lighter.

In the above embodiments, a configuration in which both sides of the belly plate part 8 are welded has been described, but it is also possible to weld both sides of the back plate part I.

Further, in the above embodiment, the blades are connected to the back plate part 1 and the belly plate part 8.
Although the structure is divided into two parts, the present invention is not limited to this, and any structure may be used as long as it is divided into two parts in the direction in which it extends into a cylindrical shape and one of the divided parts is welded on both sides.

<Effects of the Invention> As explained above, according to the present invention, the blade is divided into two in the direction in which it extends cylindrically, and one of the divided bodies is attached to the opposing plate member on both sides of the inner surface and the outer surface. By welding from the beginning, it is possible to eliminate the presence of unwelded parts in this area, making it possible to improve the strength of areas with high rotational stress, which in turn has the effect of making the impeller faster and lighter. .

[Brief explanation of drawings]

Figure 1 is a side view of a conventional impeller, and Figure 2 is a side view of a conventional impeller.
1 is a sectional view, FIG. 3 is a perspective view showing the external structure of the blade in the same impeller, FIG. 4 is a sectional view taken along the line ■-■ in FIG.
The figure is a cross-sectional view of FIG. 2, FIG. 6 is an enlarged view of FIG. 5, and FIGS. 7 and 8 are perspective views showing the blade structure of the present invention, respectively.
FIG. 9 is a sectional view of the welded portion of the same blade as above, and FIG. 10 is a fatigue strength diagram of the blade in the present invention and the conventional example. 1... Main plate 2... Side plates 5A, 5B... Welded metal parts 7... Back plate part 8... Abdominal plate agent Masuo Oiwa (2 people) Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 7 Figure 8

Claims (1)

[Claims] In an impeller having a configuration in which a blade having a streamlined cylindrical airfoil shape is fixed between opposing plate members, the blade is divided into two in the direction in which the blade extends in the cylindrical shape, and one of the divided parts is An impeller characterized in that the impeller is welded to the plate member from the inner and outer sides.