JPH07109997A - Impeller for fluid machinery and its manufacture - Google Patents

Abstract

PURPOSE:To prevent circumferential dislocation of connection surfaces by inclining the connection surfaces between main plate side vanes and shroud side vanes alternatively in opposite directions, and thereby cancelli circumferential component force applied to the plural connection surfaces when connection pressure is applied. CONSTITUTION:A plurality of vanes 6 are bridged over a main plate 5 and a shroud 1 opposed thereto. A main plate side vane 4 integrated with the main plate 5 is abutted against a shroud side vane 2 integrated with the shroud 1 for composing an impeller for a fluid machine. Connection surface 3 between the main plate side vanes 4 and the shroud side vanes 2 are inclined alternatively in opposite directions. When connection pressure is applied thereto, circumferential component force applied to the plural connection surfaces 3 is cancelled. The connection surfaces 3 are thus prevented from dislocating. The main plate and shroud are facilitated in their setting. Their fixing jig is dispensed with, and adjustment of a gap between connection surfaces is facilitated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an impeller for a fluid machine such as a pump and a blower and a method for manufacturing the impeller.

[0002]

2. Description of the Related Art One example of a conventional impeller of this type is shown in FIG. A plurality of vanes 6 are installed between the main plate 5 and the shroud 1 facing the main plate 5, and the plurality of vanes 6 are provided.
The main plate side vane 4 integrally formed with the main plate 5 and the shroud side vane 2 integrally formed with the shroud 1 are butt-joined to each other at the joint surface 3 at the tip thereof.

[0003]

In the above-mentioned conventional impeller, since the joint surface 3 is flat and inclined in the same direction and at the same angle, the main plate side vane 4 and the impeller side vane 2 are butt-joined to each other. Therefore, as shown in FIG.
When the joining surface 3 is heated to a predetermined joining temperature and the joining pressing force 10 is applied, a deviation occurs between the main plate side vane 4 and the shroud side vane 2 due to the circumferential component force acting on the joining surface 3. There is a possibility that the joining accuracy and the joining strength may decrease.

[0004]

The present invention has been invented to solve the above-mentioned problems, and the gist of the first invention is that it is installed between a main plate and a shroud facing the main plate. A main plate side vane integrally formed with the main plate and a shroud side vane integrally formed with the shroud are butt-joined to each other, and the main plate side vane and the shroud are The impeller for a fluid machine is characterized in that the joint surfaces with the side vanes are alternately inclined in opposite directions.

The gist of the second invention is that a plurality of vanes, which are erected between a main plate and a shroud facing the main plate, are integrally formed with the main plate side vane in which the main plate is integrally formed with the main plate. An impeller for a fluid machine configured by butt-joining a shroud side vane to each other, wherein a fitting portion is formed on a joint surface between the main plate side vane and the shroud side vane. .

The gist of the third invention is that a plurality of vanes, which are erected between a main plate and a shroud facing the main plate, are integrally formed with the main plate side vane in which the main plate is integrally formed with the main plate. In manufacturing an impeller for a fluid machine configured by butt-joining the shroud-side vanes to each other, outer peripheral portions are formed in advance on the outer peripheries of the main plate and the shroud, respectively, and a plurality of holes are formed on the outer peripheral portions. A method for manufacturing an impeller for a fluid machine, characterized in that the main plate-side vane and the shroud-side vane are butted and joined together with a support rod attached, and then the outer peripheral deleted portion is cut and removed.

[0007]

In the first aspect of the invention, when the joining pressure is applied, the circumferential component forces acting on a large number of joining surfaces cancel each other out.

In the second aspect of the invention, when the joining pressure is applied, the circumferential displacement of each joining surface is prevented by the fitting portion.

In the third aspect of the invention, the circumferential displacement of each joint surface is prevented by the support rod.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A first embodiment of the invention is shown in FIG. In the first embodiment, the joint surfaces 3 of the plurality of vanes 6 are alternately inclined in opposite directions. Then, when the joining pressure 10 is applied, the circumferential component forces acting on the large number of joining surfaces 3 cancel each other out.
There is no deviation.

A second embodiment of the invention is shown in FIG. In the one shown in FIG. 2 (A), the joint surface 3 is a chevron joint surface 10, and in the one shown in FIG. In the second embodiment, when the joining pressure is applied, the displacement of the joining surface 3 is prevented by the fitting portions 10 and 7 formed on each joining surface 3.

A third embodiment of the invention is shown in FIG. The outer peripheral edge of the main plate 5 and the shroud 1 is preliminarily formed with an outer peripheral deleted portion 8 of a predetermined width over the entire circumference thereof, and a plurality of outer peripheral deleted portions 8 are arranged at equal intervals along the circumferential direction (three in the figure). )
The hole 9 is drilled.

Next, the support rod 11 having a predetermined length is inserted in the hole 9.
A predetermined gap is held in the joint surface 3 by fitting both ends of the above and sandwiching them between the main plate 5 and the shroud 1. In this state, the joining surfaces 3 of the main plate side vanes 4 and the shroud side vanes 2 are butt-joined with each other by using a brazing material, and then the outer circumference removing portion 8 is cut off. The joint surface 3 is a flat surface and is inclined in the same direction and at the same angle as in the conventional case.

In the third embodiment, the support rod 11 can accurately maintain the gap between the joint surfaces 3 and prevent the displacement of the joint surfaces 3.

[0015]

According to the first aspect of the present invention, since the joining surfaces of the main plate side vanes and the shroud side vanes are alternately inclined in the opposite directions, when the joining pressure is applied, a large number of joining surfaces are applied in the circumferential direction. Since the component forces cancel each other out, the circumferential displacement of the joint surface can be prevented.

As a result, the main plate and the shroud can be easily set, and a fixing jig for fixing them is not required, and the adjustment of the joining gap and the joining pressure can be facilitated. Then, it is possible to prevent the impeller from deteriorating in performance by improving the joining strength and joining accuracy of the joining surface.

In the second aspect of the present invention, since the fitting portion is formed on the joint surface between the main plate side vane and the shroud side vane, when the joining pressurizing force is applied, the circumferential deviation of the joint surface is prevented by the fitting portion. You can.

In the third aspect of the invention, the support rod can prevent the joint surface from shifting in the circumferential direction.

[Brief description of drawings]

FIG. 1 is a partial sectional view showing a first embodiment of the present invention.

2 (A) and 2 (B) are partial cross-sectional views showing a second embodiment of the present invention.

FIG. 3 shows a third embodiment of the present invention, (A) is a plan view,
(B) is a partial sectional view taken along the line BB of (A).

FIG. 4 is a partial cross-sectional view of a conventional impeller.

FIG. 5 is a partial cross-sectional view showing a joining procedure of a conventional impeller.

[Explanation of symbols]

 5 Main plate 1 Shroud 6 Vanes 4 Main plate side vanes 2 Shroud side vanes 3 Joining surface

Claims (3)

[Claims] 1. A main plate-side vane integrally formed with the main plate and a shroud-side vane integrally formed with the shroud are butt-joined to each other with a plurality of vanes installed between the main plate and a shroud facing the main plate. In the impeller for a fluid machine configured as described above, a joint surface between the main plate side vane and the shroud side vane is alternately inclined in opposite directions. 2. A main plate-side vane integrally formed with the main plate and a shroud-side vane integrally formed with the shroud are butt-joined to each other with a plurality of vanes installed between the main plate and a shroud facing the main plate. In the impeller for a fluid machine configured as described above, a fitting portion is formed at a joint surface between the main plate side vane and the shroud side vane. 3. A main plate side vane integrally formed with the main plate and a shroud side vane integrally formed with the shroud are butt-joined to each other with a plurality of vanes installed between the main plate and a shroud facing the main plate. In manufacturing an impeller for a fluid machine configured by
Preliminarily formed outer peripheral removed portions on the outer peripheries of the main plate and the shroud, and butt-joining the main plate side vane and the shroud side vane in a state where support rods are attached to a plurality of holes provided in the outer peripheral removed portion, and then, A method for manufacturing an impeller for a fluid machine, characterized by cutting and removing the outer peripheral deleted portion.