JPS5898699A - Pump impeller made of steel plate - Google Patents

Abstract

PURPOSE:To reduce the abrasion of a trimming die by a method wherein protuberances are provided at the tip end and the side part of a wing while notches are provided at the tip ends of the shrouds of fore and aft surfaces, in order to eliminate the part of corner in the trimming die for a press. CONSTITUTION:Upon a resistance caulking welding, the protuberances 8, 8' at the tip end of the wing are abutted against the notches 10, 10' provided at the shrouds 5, 6 of the fore and aft surfaces while the protuberances 9a, 9b are engaged with holes 7, 7' on the shrouds 5, 6 of fore and aft surfaces. In case the impeller is assembled by a projection welding, the protuberances 8, 8' are provided at the outside of the tip end of the wing 9 and the protuberances 9c, 9d, shorter than the protuberances 9a, 9b, are provided at the side part of the wing 9, the protuberances 8, 8' are combined with the notches 10, 10' at the tip ends of the shrouds 5, 6 to locate them and the projection welding is effected, therefore, the abrasion of the trimming die may be reduced.

Description

[Detailed description of the invention] The present invention relates to a pump impeller made of steel plate.

A conventional pump impeller made of steel plate will be explained with reference to FIGS. 1 to 6.

FIG. 1 is a perspective view showing an example of a conventional pump impeller made of a steel plate, and FIGS. 2 and 5 are illustrations showing the state before welding.

In FIGS. 1 to 5, 1 is a rear IF
is a blade, and 5 is a front shroud. Conventionally, the above-mentioned a2
niil! As shown in Figure 2, there are protrusions 4°4' on both sides, 5.
This raised metal rear shroud 1 and 1i
Either by projection welding to the i11 side shroud 3, or as shown in Figure 5, longer protrusions 4a, 4a', 5a, 5a' are provided on the sides of the blade 2, respectively, and the rear shroud 1 and [ij1 A hole 6.6' is provided in the surface shroud 5 in which the above-mentioned inversion fits.

The inverted part was fitted into the hole and caulked, and at the same time, it was bath-welded.

The shape of the conventional steel plate pump impeller formed as described above is either circular or polygonal with the same number of blades, but in the case of a polygonal shape, the corners of the mold are subject to significant wear when punching the material. Ta. When welding the blade 2, the front shroud 3 and the rear shroud 1.
The positioning of the tip of the vane outlet could not be done accurately due to the effects of welding heat, compression force, etc., and this was one of the thicknesses that caused variations in pump performance.

The present invention improves the conventional technology as described above, reduces the wear of the press cutting die, extends its special purpose, and makes it possible to easily position the tip of the outlet of one blade f: made of a steel plate that can equalize variations in pump performance. The purpose is to provide a pump impeller.

In order to achieve the object of item 1vjI, the present invention provides a protrusion on the outer edge of the exit side of the steel plate blade, provides a corresponding notch in the longitudinal shroud into which the protrusion fits, and inserts the protrusion into the notch. Fit the front and rear shrouds and blades
It is designed to be integrally formed by welding or the like.

Next, an embodiment of the present invention will be explained with reference to FIGS. 4 to 9.

Fig. 4 (a) is a half-sectional view of a circular impeller that can be used in the present invention by resistance caulking welding, Fig. 4 (b) is a side view thereof, and Fig. 5 (a) is a half-ifr of an n-polygonal impeller. Figure 6 (b) is a side view, Figure 6 (a) is a half-sectional view of a circular impeller without projection welding, Figure 7 (b) is a side view, and Figure 7 (a) is the same. A half-sectional view of an n-polygonal impeller, FIG. 7 is a perspective view of the blade shown in FIGS. 6 and 7 before welding; FIG.

In Figures 4 and 8, the end is the rear V-shaped shroud, β is the front shroud, and 9 is the blade of the punched bonde. This blade 9 is provided with a protrusion 8.8' on the outside of the tip and protrusions 9a, 9k) and 9f on one side. Front and rear shrouds 5 and 6rt facing this blade 9
a notch 10 into which the protrusion 8.8' of the blade base end fits;
, 10' are provided, and the protective protrusions 9a and 9b are fitted to the sides of the blades, so that the resistance crimping f! If they are in contact with each other, the protrusions 8.8' on the tips of the 5 blades are placed on the front and rear shrouds 5.6, and assembled by butting them against the friend notches IQ, iQ'. .6 hole 7.7', 1g4 figure (a),
As shown in FIG. 5 ((a)), resistance caulk welding is applied to the core.

In addition, in the case of projection welding, as shown in FIG. 9, a protrusion 8.8' is provided on the outside of the tip of one blade 9, and a protrusion 90.8' is provided on the side of the protrusion 90.
9d and a notch 10 at the tip of the front and rear shrouds 5.6.
, 10' are assembled and positioned, and projection welding is performed as shown in FIGS. 6 and 7.

In this way, in the present invention, protrusions are provided at the base end and side of each blade, and notches are provided at the tips of the front and rear shrouds, so there is no corner WA in the press cutting die, reducing wear on the cutting die. It can prolong your life. The blade and the front and rear shrouds are positioned simply by butting the protrusion on the tip of the blade against the cutout, and the resistance caulking bath minimizes deformation due to heat and external force even when projection welding is performed. This makes it possible to stabilize the pump characteristics.

[Brief explanation of the drawing]

Figure 1 is a perspective view showing an example of a conventional steel plate impeller.
The figure shows the state before projection welding! Figure I and Figure 3 are the same perspective views before resistance caulking welding. Fig. 4 (a) is a half-sectional view of a circular impeller to which the present invention is applied by resistance caulking welding, Fig. 4 (b) is a side view thereof, and Fig. 5 (
A) is also a half-sectional view of the n-polygonal impeller, FIG. 6(B) is a side view thereof, FIG. Figure, $7 Figure (a) is also a half-llr side view of the n-polygonal impeller;
b) is its side view. Figure 8 is an explanatory diagram of the state of the impeller before welding shown in Figures 4 and 5, and Figure 9 is an explanatory diagram of the impeller shown in Figures 6 and 7. ...Protrusion at the tip of the impeller, 9...Blade, 9a, 9b, 90.9
cl-, - protrusion, 10.10'...notch. Agent Patent Attorney Susuki 1) Figure 1'') r3 Figure 4 (a) (mouth), ii, ``''. 1 ``-''' Figure 8 Figure 9 Figure 7, 6

Claims (1)

[Claims] In a pump impeller configured with a front shroud made of a steel plate, a rear shroud, and a vane, a protrusion is provided on the outer edge of the outlet side of the vane, a notch into which the protrusion fits is provided in the corresponding front and rear shrouds, and the notch is provided with a protrusion in which the protrusion fits. A steel plate impeller characterized in that the front and rear shrouds and the blades are fixed by welding or the like by fitting the projections of the blades.