JPH07332289A - Impeller - Google Patents

Abstract

(57) [Summary] [Structure] Main plate 1 which is a donut-shaped disc and radially attached from the central portion to the outer peripheral portion of main plate 1 while drawing a constant curve 4 or integrated with main plate 1. It is composed of a blade 2 and a side plate inner ring portion 3a and a side plate outer ring portion 3b which are doughnut-shaped disks attached to the blade 2 at positions symmetrical to the main plate 1 with a gap. [Effect] The number of machining steps can be reduced. Also,
Since the joined portions of the divided side plates can be continuously welded, the quality can be improved and the number of steps can be reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an impeller attached to a rotor, which is a rotating body of a rotary machine, or a plurality of impellers, and particularly, to draw a constant curve in a gap between a main plate and a side plate from an axial center. The present invention relates to a rotary machine suitable for a manufacturing method of an impeller in which a plurality of blades radially arranged on an outer peripheral portion have a large curvature.

[0002]

2. Description of the Related Art A general prior art of a shape and a manufacturing method for an impeller of this type will be described with reference to FIGS. 3, 4, 5 and 6.

FIG. 3 is an illustration of a prior art impeller.
Main plate 1 which is a donut-shaped disc, and a plurality of blades 2 which are attached radially from the central portion of the main plate 1 to the outer peripheral portion while drawing a constant curve 4 or which are integrated with the main plate 1 and the main plate 1 are symmetrical It is composed of a side plate 3 that is a donut-shaped disc that is attached to the wing 2 with a gap at a position.

In FIG. 4, the root portion of the blade 2 is welded to the main plate 1,
FIG. 7 is a cross-sectional view of a joint portion between the main plate 1 and the blade 2 when they are joined by the weld metal 5a. FIG. 5 shows that the blade 2 is machined from the material of the blade 1 to form the blade 1 and the blade 2.
FIG. 4 is a cross-sectional view of the case in which is integrated.

FIG. 6 is a perspective view showing a conventional technique for manufacturing the impeller of FIG.

In the prior art, the main plate 1 and the blade 2 having the structure shown in FIGS. 4 and 5 are combined with the side plate 3, and the root of the joint between the blade 2 and the side plate 3 is joined by the weld metal 5b by welding. . This manufacturing method is a method generally used when manufacturing an impeller. Similar known examples of this type of manufacturing method are disclosed in JP-A-52-14906 and JP-A-51-73607. Hereinafter, the above manufacturing method is referred to as a manufacturing method A.

As a method for manufacturing the impeller shown in FIG. 3, other than the manufacturing method A, a known example is disclosed in JP-A-54-97.
There is 547 publication. This known example will be described with reference to FIG.

In the first pass, in which the blade 2 is fixed to the main plate 1 or the side plate 3 by welding the blade 2 from the outside of the impeller through the main plate 1 or the side plate 3 having the groove 6 obtained by machining or cutting. Using the tungsten electrode 7 without coating welding material under encapsulation of the inert gas 8 (Tig welding), excess material 9 needed to seam the corner to the blade 2
Is supplied by the bottom wall of the formed groove 6 through the main plate 1 or the side plate 3, and the groove 6 is referred to as a closed slot that does not pass through the entire wall thickness of the main plate 1 or the side plate 3. In the filling pass, the filler metal is used in the same TIG welding, and the TIG method used in the first pass and the next filling pass is used to make the current, voltage, welding speed and position of the tungsten electrode 7 constant along the entire length of the closed slot. It is a method for arc welding the main plate 1 and the blades 2 of the side plates 3 of a rotary machine, which is characterized by being automated so that A known example similar to this type of manufacturing method is disclosed in JP-A-61-262465.
JP-A-62-28071, JP-A-62-107866, JP-A-SHO
62-46191, JP-A-62-187569, JP-A-55-40201
No. 5, JP-A-55-64193, JP-A-47-19442, JP-A-SHO
48-45448, JP-A-48-88039, JP-A-49-65951
JP-A 64-48682, JP-A 55-22471, JP-A 2
-121796, JP-A-63-26285, JP-A-63-26286
And JP-A-63-203286. The above-mentioned known examples include arc welding, electron beam welding, electroslag welding, brazing, etc. in addition to TIG welding, but it is considered that the basic manufacturing method plans are similar to each other. Hereinafter, these manufacturing methods are collectively referred to as a manufacturing method B.

In addition, as a known method other than the manufacturing method A and the manufacturing method B as a method for manufacturing the impeller shown in FIG. 3, there is JP-A-55-78196. This known example will be described with reference to FIG. The main plate and side plates are made to correspond to each other and divided into fan-shaped parts corresponding to the number of wing pieces, and the fan-shaped main plate material 11,
With the three parts of the fan-shaped side plate material 12 and the blade portion 13, the impeller element 10 for forming the impeller is assembled, or the required number of impeller elements 10 having such a shape is formed and formed, and the impeller element is formed. This is a method of manufacturing an impeller in which 10 are collected in a circle and the elements are welded together. A known example similar to this type of manufacturing method is Japanese Patent Laid-Open No. 54-83106. Hereinafter, these manufacturing methods are collectively referred to as a manufacturing method C.

[0010]

In the prior art of the manufacturing method A in FIG. 6 and a known example similar to FIG. 6, the manufacturing method of the impeller is simpler and the manufacturing man-hour is smaller than the manufacturing methods B and C. However, if the gap 16 between the main plate 1 and the side plate 3 is very narrow, or if the curve 4 of the blade 2 becomes large, it becomes difficult or impossible to join them by welding. Furthermore, with this impeller shape, it is also difficult to automate welding. There was a problem that was.

In the prior art of the manufacturing method B in FIG. 7 and a known example similar thereto, in the gap 1 between the main plate 1 and the side plate 3.
Even when 6 is very narrow, or when the curve 4 of the blade 2 is large, welding can be performed and the welding can be automated easily. However, according to this conventional technique, when the groove 6 is formed in the main plate 1 or the side plate 3 by cutting, the cutting end mill has to have a special shape in accordance with the groove shape, and when the side plate 3 and the blade 2 are displaced from each other, a positional deviation occurs. Since good joining cannot be achieved, the positional accuracy must be cut with extremely high accuracy. Therefore, a lot of time is required for cutting man-hours. Furthermore, in this manufacturing method B, since the groove 6 must be intensively welded to form a part of the main plate 1, distortion of the welding and variations in the amount of deposited metal in each groove cause the impeller, which is a rotor, to rotate. There was a problem that the dynamic balance was easily disturbed.

8 and the related art of the manufacturing method C in a known example similar to that can solve the problem of the manufacturing method A, but like the manufacturing method B, the dynamic balance of the impeller is easily disturbed. There is a problem that becomes. Furthermore, since the manufacturing method C is a structure in which the number of blade portions 13 is the number of the impeller elements 10, the impeller elements 10 are collected in a circular shape, and the elements are welded together, welding is performed as the number of blades increases. The number of main plate joints 14 and side plate joints 15 also increases. Further, when the curved line 4 of the blade portion 13 becomes large, it becomes impossible to perform straight-line processing on the joint surfaces of the main plate material joint portion 14 and the side plate material joint portion 15 of the impeller element 10, and it takes a lot of time to manufacture the impeller element 10. It costs.

[0013]

In order to solve the above problems, it is necessary to have a structure that can be automated as much as possible so as to reduce the manufacturing time of the impeller and to prevent the dynamic balance after manufacturing from being disturbed. is there.

According to the first aspect of the present invention, the main plate and the blade are manufactured by the conventional manufacturing method A and manufacturing method B.
Same as the above, but the side plate has a donut-shaped disc shape divided into an inner ring part and an outer ring part so that it can be manufactured without special machining.

In the invention described in claim 2 of the present invention, the main plate and the blade piece described in claim 1 and the side plate inner ring portion can be joined by welding the blade root as in the manufacturing method A. In addition, the joint between the outer ring portion of the side plate and the inner ring portion of the side plate can be welded from the outside of the impeller.

According to a third aspect of the present invention, each of the side plate inner ring portion and the outer ring portion of the first aspect is further divided into a donut-shaped disc shape, and special machining is performed. I made it possible to produce without needing.

According to a fourth aspect of the present invention, in the impeller of the first, second, and third aspects, the side plate inner ring portion and the outer ring portion, or a plurality of divided side plate inner ring portions and outer ring portions are joined, The spigot portion can be processed without requiring special machining, and at the same time, the weld groove can be processed so that the joint portion can be welded from the outside of the impeller.

In a fifth aspect of the present invention, there is provided a blade root portion which is a joint portion between the main plate and the blade, and a joint portion between the side plate inner ring portion and the outer ring portion according to claim 4, or a side plate inner ring portion which is divided into a plurality of sheets. The welding of the outer ring will be automated by applying an automatic welding device or an electron beam welding method.

[0019]

In the invention according to claim 1 of the present invention, the side plate is divided into an inner ring part and an outer ring part in the shape of a donut-shaped disc, so that special machining such as the manufacturing method B of the prior art is unnecessary. Therefore, the number of manufacturing steps can be reduced.

According to the second aspect of the present invention, by dividing the side plate into the inner ring portion and the outer ring portion, even if the curvature of the blade becomes large or the blade outlet width becomes narrow, the manufacturing method of the prior art. The welding joining method of the blade and the side plate described in A can be applied, the welding man-hour can be reduced as compared with the manufacturing method B and the manufacturing method C of the prior art, and further, the joint portion of the side plate inner ring portion and the outer ring portion can be Since the structure is such that the impeller is welded in the circumferential direction from the outside, the dynamic balance after manufacturing the impeller is less likely to be disturbed.

According to the third aspect of the invention, when the inner ring portion and the outer ring portion of the side plate according to the first aspect are divided into two parts, the curvature of the blade is further increased, or the gap between the main plate and the side plate of the impeller is increased. Even if it becomes difficult to weld the side plate to the blade described in the manufacturing method A of the prior art due to a reason such as narrowing,
The inner ring portion and the outer ring portion of the side plate can be welded by further dividing into a donut-shaped disc shape.

According to the fourth aspect of the present invention, when the side plates divided into the donut-shaped disc shape are assembled, the combination work is performed with a spigot, so that the combination work can be performed accurately and quickly. It can be carried out. Further, the welding groove working can be performed simultaneously with the inlay working without requiring special working as in the manufacturing method B of the prior art, and the number of manufacturing steps can be reduced.

In the invention described in claim 5, the welding man-hour is reduced by automating the welding of the joint portion.

[0024]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. FIG. 1 shows an outline of an impeller for a rotary machine to which the present invention is applied. Main plate 1 which is a donut-shaped disc
A plurality of main plates 1 are attached radially from the central portion to the outer peripheral portion while drawing a constant curve 4, or the main plate 1
And a side plate inner ring portion 3a which is a donut-shaped disc attached to the blade 2 at a position symmetrical to the main plate 1 with a gap therebetween.

The method of manufacturing the impeller is as follows. After arranging a plurality of blades 2 on the main plate 1, the roots of the blades 2 are joined by welding. Alternatively, the blade 2 is machined from the material state of the main plate 1 by machining. Separately from this manufacturing work, the spigot processing part 7 and the welding groove processing part 18 are applied to the part which becomes the joint part of the side plate inner ring part 3a and the side plate outer ring part 3b by machining.

A member obtained by joining the main plate 1 and the blade 2 by welding, or a member obtained by cutting the blade 2 from the material state of the main plate 1 is attached to the side plate inner ring portion 3a at a symmetrical position of the main plate 1. After the attachment, the joint with the blade 2, that is, the root of the blade 2 is joined by welding. After the joining, the side plate outer ring portion 3b is attached according to the spigot of the side plate inner ring portion 3a, and the joining portion with the blade 2 is welded. Finally, the welding groove 18 formed at the joint between the side plate inner ring portion 3a and the side plate outer ring portion 3b is joined by welding. Since the main plate 1 and the blade 2 can be welded and the side plate inner ring portion 3a and the side plate outer ring portion 3b can be welded from the outside of the impeller, automatic welding can be performed. Further, in particular, the welding of the joint between the side plate inner ring portion 3a and the side plate inner ring portion 3b can be performed by applying the electron beam welding method.

FIG. 2 is an explanatory view of the side plate in a state where the side plate inner ring portion 3a and the side plate outer ring portion 3b shown in FIG. 1 are further divided. The side plate is not limited to being divided into the side plate inner ring portion 3a and the side plate outer ring portion 3b, but may be divided into four as shown in FIG. At this time, the joint portion of the divided side plates is subjected to the spigot processing and the welding groove processing shown in FIG.

[0028]

According to the present invention, the number of machining steps can be reduced by spigot-grooving the groove as compared with the conventionally known slot welding method. Also,
Since the joined parts of the divided side plates can be continuously and automatically welded, the quality is improved and the man-hours are reduced. Furthermore, by dividing the side plate of the impeller, which is a rotating body, into a donut-shaped disc shape, the dynamic balance after manufacturing is less likely to be disturbed. In particular, it has a remarkable effect when compared with the conventionally known technique of radially dividing. Further, in the finishing process after joining the blade and the side plate, the joining portion can be provided within the range where the jig and tool reach, and the finishing work and the finishing effect are improved.

[Brief description of drawings]

FIG. 1 is an explanatory view of an impeller showing an embodiment of the present invention.

FIG. 2 is an explanatory view of a side plate obtained by further dividing the side plate inner ring portion and the side plate outer ring portion of the embodiment of FIG. 1 into four parts.

FIG. 3 is an explanatory view of a structure of a conventional impeller.

FIG. 4 is a cross-sectional view of a joint portion when the main plate and the blade of the conventional impeller of FIG. 3 are joined by welding.

FIG. 5 is a cross-sectional view of a case where the main plate and the blade are integrated after the blade of the conventional impeller of FIG. 3 is machined from the material of the main plate by machining.

FIG. 6 is a perspective view showing a conventional technique for welding a blade and a side plate when manufacturing the conventional impeller of FIG.

FIG. 7 is an explanatory diagram of an example of a conventionally known example.

FIG. 8 is an explanatory diagram of an example of a conventionally known example.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Main plate, 2 ... Wing, 3a ... Side plate inner ring part, 3b ... Side plate outer ring part, 4 ... Curve, 5c ... Weld metal of joint part of side plate inner ring part and side plate outer ring part, 17 ... Inlay processing part, 18 ... Welding opening Pre-processing section.

Claims (1)

[Claims] 1. A main plate which is a donut-shaped disc, and a plurality of blades which are radially attached from a central portion of the main plate to an outer peripheral portion while drawing a constant curve or which are integral with the main plate, and the main plate. And a side plate that is a donut-shaped disc that is attached to the blade via a gap at a target position, in which the side plate is divided into an inner ring portion and an outer ring portion into the donut-shaped disc shape. An impeller that is characterized by