JPS60198398A - Impeller - Google Patents

Abstract

PURPOSE:To aim at enhancing the strength of an impeller, by dividing a blade in the impeller into a blade leading end section and a blade trailing end section so that the welding between the leading end section and plate members opposing the former may be made from both of inner and outer peripheral sides of the leading end section. CONSTITUTION:A blade 13 is divided into a blade leading end section 7 and a blade trailing end section 8. The blade leading end section 7 is secuted to a main plate 1 and side plates by means of welding 5A from the inner peripheral side of the leading end section 7, and then the leading end section 7 and as well the trailing end section 8 are secured to the side plates by means of welding 5B from the outer peripheral side thereof. Accordingly, no unwelded sections exist in the securing sections between the leading end section 7 and the main plate or the side plates, thereby it is possible to aim at enhancing the strength 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.

As shown in FIG. 3, this blade 3 has a streamlined cylindrical airfoil shape as described above, and has a lip 4 fixed to its inner circumferential side for reinforcement. , is molded as a single item, assembled by welding, and then welded and fixed to the main plate 1 and side plate 2.

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 peripheral 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 blade head portion of the blade 3, where the rotational stress of the impeller is particularly high, is significantly reduced as shown in A in FIG. 9.

<Summary of the Invention> In view of the above-mentioned conventional circumstances, the present invention divides one blade into a wing head portion and a wing tail portion, and includes a plate member facing the wing head portion to which particularly high rotational stress is applied. The purpose of the present invention is to eliminate unwelded areas and improve strength by creating a configuration in which welding can be performed from both the inner and outer circumferential sides of the blade support portion.

<Embodiment of the Invention> Hereinafter, an embodiment of the present invention will be described based on FIGS. 7 to 9.

In FIG. 7, the blade has a cylindrical airfoil shape with 13 vertices, and is divided into a T wing head portion and an 8 armature portion. 4 is a lip fixed to the inside of the leg part 8.

Such a blade 13 is assembled by separately welding the wing head part and the armature part 8 to the main plate 1 and the side plate 2 as shown in FIG.

In this case, first, as shown in FIG.
and a side plate (not shown), and then the wing head portion 7 and the armature portion 8 are fixed to the main plate 1 and the side plate by welding from the respective outer peripheral sides (welding weld metal portion 5B).

Therefore, as a result of fixing the wing head portion 1 to the main plate 1 and the side plate by welding from both the inner and outer circumferential sides, the fixed portion between the wing head portion 7 and the main plate 1 and the side plate is fixed. Since there is no unwelded part, the fatigue strength of the wing head portion 7, which is particularly subjected to high rotational stress, is improved as shown in B in FIG. 9. In addition, as a result of improving the strength in this way, the speed of the impeller can be increased,
This has the effect of reducing weight.

<Effects of the Invention> As explained above, according to the present invention, a blade is divided into a wing head portion and an armature portion, and the blade head portion is welded to opposing plate members from both the inner and outer circumferential sides. By doing so, it is possible to eliminate the presence of unwelded parts in this part, improve the strength of the blade head part where 5-turn stress is high, and have the effect of realizing higher speed and lighter weight of the impeller.

[Brief explanation of drawings]

Figure 1 is a side view of a conventional impeller, and Figure 2 is 1- in Figure 1.
1 sectional view, FIG. 3 is a perspective view showing the external structure of the impeller in the same impeller trap as above, FIG. 4 is a sectional view shown in FIG. The figure is an enlarged view of Figure 5,
The figure is a perspective view showing the blade structure of the present invention, FIG. 8 is a sectional view of a welded part of the same blade, and FIG. 9 is a fatigue strength diagram of the blade in the present invention and a conventional example. 1... Main plate 2... Side plate 5A, 5B... Welded metal part 7... Wing head part 8... Armature part 13.
...Hane agent Masuo Oiwa (and 2 others) Figure 1

Claims (1)

[Claims] In an impeller having a configuration in which airfoil-shaped blades having a streamlined cylindrical shape are fixed between opposing plate members, the blades are
An impeller comprising: a blade head portion welded to the plate member from the inner circumferential side and an outer circumferential side; a wing tail portion welded to the plate member; and a 02 split body.