JPS5879686A - Impeller in elmo type pump - Google Patents

Abstract

PURPOSE:To provide blades each having a high degree of accuracy in its area for reducing flow resistance, by integrally stacking sheet plates which are punched, in the axial direction of the pump for forming an impeller. CONSTITUTION:Punched several thin plates 31 are integrally stacked one upon another in the axial direction of an ELMO type pump, for forming an impeller. Further, a reinforcing annular disc 32 is disposed in the middle of the impeller at the outer peripheral part thereof, and air-communication is established between the inner periphery of the disc 32 and the outer periphery of a boss 33. The thin plates 32 are made of metal plates or plastic plates in accordance with the quality of working water or the like, that is, in case of using steel plates, the tips of blades 34 are fixed together with the disc 32 for forming an integral member.

Description

[Detailed description of the invention] This invention makes it possible to achieve surface accuracy of the blade.
; Concerning the blade ratio of elbow-shaped pumps.

A conventional example of an elbow-shaped pump will be explained based on FIGS. 1 and 2. In these figures, a cast iron blade ratio l, in which a large number of blades 1b are radially provided around the outer periphery of a cylindrical boss 1a, is eccentrically surrounded by a cylindrical casing 2 8.
In addition, a disc-shaped boat plate 8 facing the end face of the impeller l, and a side cover 4 are fixedly attached to the end face of the casing 2 via the boat plate 8.

An intake hole 4a, an air port 4b, and a water supply port 4C for injecting working water are provided in the side cover 4 to communicate with the inner chamber of the JL casing 2.

The working water injected into the casing 2 from the water supply port 4C is pressed against the inner circumference of the casing 2 by the centrifugal force caused by the rotation of the impeller 1 to form a water ring 5.
The outer periphery of the blade ratio l and the laparotomy of the casing 2 are sealed. In this water seal shape, a knee cavity 4Lf is created in the center of the inner chamber of the casing 2, partitioned radially by the blade lb, and the blade ratio l is eccentric to the casing 2 and rotates at the r position, so as the blade jlL1 rotates. As a result, the cross-sectional area of each of the spaces is reduced, and the internal air is compressed and discharged by JL (JL), so that air is sucked through the intake port 4a and exhausted from the exhaust gap 4b.

In such a structure, the side surface of the vane lb remains a cast surface with a low OKIM degree, which increases fluid resistance and improves pump efficiency.
F, and process the side surface of the wing i1b to obtain the area degree f
Rice had the disadvantage that it required a lot of work.

SUMMARY OF THE INVENTION In order to eliminate the above-mentioned drawbacks, it is an object of the present invention to provide an impeller for an Elmo-type pump that can improve the surface accuracy of its blades.

Hereinafter, embodiments of this invention will be explained based on the drawings.

FIG. 8 shows the blade ratio of the Elmo type pump according to the present invention. The impeller in this figure is formed by lateral spirals. In the center of the outer periphery of the blade ratio, a reinforcing annular plate 32 or a metal plate or a plastic plate is used depending on the water of Bengami. Ii! By reducing the thickness of d4tt and te31, the corresponding range of pump performance can be increased.

Since it is constructed by horizontally folding, it has the effect of increasing the yoke area by 1.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing a conventional Elmo type pump.

Claims (1)

[Claims] ■) An Elmo-shaped pump impeller characterized by a large number of blades released around the outer circumference of a cylindrical boss.