JPH0861207A - Guide vane of hydraulic turbine - Google Patents

Abstract

PURPOSE: To rationalize welding work and improve manufacturing accuracy when manufacturing a guide vane by welding a high pressure side blade face member which forms the blade face of the guide vane and a low pressure side blade face member to reinforcing ribs. CONSTITUTION: A reinforce rib 25 is welded to the low pressure solid plate member 13 of a guide vane 1. On the other hand, a high pressure side blade face member 22 is formed into a solid plate, and a slot 26 is provided at a position where the high pressure side blade face member 22 faces on the reinforcing rib 25 in the high pressure side blade face member 22. The reinforcing rib 25 is jointed to the high pressure side blade face member 22 by slot welding with the slot 26.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a guide vane of a water turbine.

[0002]

2. Description of the Related Art A guide vane of a water turbine is for adjusting the amount of water flowing into a runner, and is manufactured by a welded structure made by combining cast steel or steel plate materials, and a large number of welded structures are adopted in a large turbine such as a valve turbine. Has been done. FIG. 3 is an exploded perspective view of a guide vane of a conventional welded structure of a valve turbine, and a conventional technique will be described with reference to FIG. In FIG. 3, a guide vane 1 is a high pressure surface 2 along which water flows.
And a blade surface composed of a low pressure surface 3 (not shown) disposed on the back side thereof, a leading edge 4 and a trailing edge 5 respectively located at both ends of the high pressure surface 2 and the low pressure surface 3, and a guide vane 1 The long axis 6 and the short axis 7 which are moving axes, and the long axis side end surface 8 which covers the openings at both ends of the high pressure surface 2 and the low pressure surface 3 and sandwiches the long axis 6 or the short axis 7 respectively. And an end face 9 on the minor axis side.

The guide vane 1 is manufactured by welding the following members. Low pressure side blade surface member 1 forming the low pressure surface 3
3, a low-pressure side blade surface member 13 in which a reinforcing rib 10 is welded over the entire length, and a high-pressure side blade surface member 12 composed of four high-pressure side blade surface members 12a, 12b, 12c, 12d forming the high-pressure surface 2, and a leading edge. A leading edge member 14 forming 4;
A trailing edge member 15 that forms the trailing edge 5, a long shaft member 16 that forms the long shaft 6, a short shaft member 17 that forms the short shaft 7, and a long shaft side end face member 18 that forms the long shaft side end face 8. And the short-axis side end face member 19 forming the short-axis side end face 9 are manufactured by welding.

Each of the above-mentioned members is manufactured by cutting or bending a steel material by itself. At this time, since the high pressure side blade surface member 12 forming the blade surface of the guide vane is welded over the entire length of the reinforcing rib 10 of the low pressure side blade surface member 13, the steel plate material is applied to the high pressure side blade surface members 12a, 12b, 12.
The divided high pressure blade surface member and the reinforcing rib 10 are joined to each other by forming a weld bead 20 by welding. In addition, 21 is a welding bead in which the other side surface portion of the high pressure side blade surface member 12d is welded to the leading edge member 14.

[0005]

As described above, the high pressure side blade surface member 12 includes the high pressure side blade surface members 12a, 12b, 12c,
12d is divided into four parts, but it takes a lot of time to manufacture each divided high-pressure side blade surface member, temporarily align and weld each divided high-pressure side blade surface member, and the manufacturing accuracy is high. However, there is a problem that

An object of the present invention is to manufacture a blade surface member such as a high-pressure side blade member without dividing the blade surface member so as to rationalize the manufacturing and welding work of the blade surface member, reduce the guide vane manufacturing time and improve the manufacturing accuracy. Is to provide a guide vane for a water turbine that can

[0007]

In order to solve the above problems, according to the present invention, in a guide vane of a turbine having a blade surface having a high pressure surface and a low pressure surface and adjusting the amount of water flowing into a runner, The high pressure side blade surface member forming the surface and the low pressure side blade surface member forming the low pressure surface are each formed of a single plate, and the reinforcing rib is welded to one of the high pressure side blade surface member and the low pressure side blade surface member. The other blade member is provided with a slot or hole row at a position facing the reinforcing rib of this blade member, and the reinforcing rib and this blade member are slot welded through the slot or through holes of the hole row. It shall be joined by plug welding.

Further, the above-mentioned reinforcing ribs are high-pressure side blade surface members,
The low-pressure side blade surface member is provided at the central portion, and the blade surface member on the side having the slot or hole row is joined to the reinforcing rib by slot welding or plug welding.

[0009]

The blade surface of the guide vane of the water turbine has a high pressure surface and a low pressure surface, the high pressure surface is formed by the high pressure side blade surface member, while the low pressure surface is formed by the low pressure side blade surface member, and the high pressure side blade surface member and the low pressure side blade surface member are formed. A reinforcing rib is interposed and welded to the member. in this case,
Reinforcing ribs are attached to one of the high-pressure side blade surface member and the low-pressure side blade surface member by welding, and the other blade surface member is provided with a slot or hole row at a position where this blade surface member faces the reinforcing rib. Since the reinforcing rib and the blade surface member are joined by slot welding through the slot when the slot is provided, or by plug welding through the hole when the row of holes is provided, the former reinforcing rib The wing surface member to be attached by welding may be a single plate as in the conventional case, and the latter wing surface member for performing slot welding or plug welding may be provided with a slot or a hole. it can.

Further, when the guide vanes are used, the stress is increased at the central portion of the blade member, so that the reinforcing rib is provided at the central portion, and the welding or slot welding is performed on the blade member on the side where the slots or hole rows are provided. The strength can be secured by plug welding and joining.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an exploded perspective view of a guide vane of a water turbine according to an embodiment of the present invention. In FIG. 1 and FIG. 2 described later, the same parts as those in the conventional example of FIG. 3 are designated by the same reference numerals, and the description thereof will be omitted. 1 differs from the conventional example in that two reinforcing ribs 25 are attached to the low-pressure side blade surface member 13 by welding, and the high-pressure side blade surface member 22 is provided with two rows at positions where the blade surface member 22 faces the reinforcing rib 25. The slot 26 is provided, and the reinforcing rib 25 and the high-pressure-side blade surface member 22 are joined by slot welding with the welded metal 27 on the slot 26.

By manufacturing the guide vane 1 having such a structure, the high pressure side blade surface member 22 is provided with the slot 26.
Since it is provided and is joined to the reinforcing rib 25 by slot welding, the high-pressure side blade surface member 22 can be formed by a single plate. Therefore, since the high-pressure side blade member 22 can be manufactured by cutting and bending as a single plate, the number of parts and the welding length can be reduced, so that the manufacturing time can be shortened and one high-pressure side blade member can be manufactured. Since it can be manufactured with a plate, the manufacturing accuracy is greatly improved.

Although the reinforcing ribs 25 are two in this embodiment, the same effect as described above can be obtained even if the number of reinforcing ribs 25 is increased if necessary. FIG. 2 is an exploded perspective view of a guide vane of a water turbine according to another embodiment of the present invention. In FIG. 2, the high pressure side blade member 32 is provided with two rows of holes 28 at the position where the high pressure side blade member 32 faces the reinforcement rib 25 welded and attached to the low pressure side blade member 13. It is the same as FIG. 1 except that the high pressure side blade member 32 is joined by plug welding in which a weld metal 29 is filled in the hole 28.

By manufacturing the guide vane with such a structure, the blade surface member on the high-pressure side can be a single plate as in the case where the above-mentioned slot is provided, which further shortens the manufacturing time and improves the manufacturing accuracy. Significant improvements can be made. Further, although the reinforcing ribs 25 are two in this embodiment, the same effect as described above can be obtained even if the number of the reinforcing ribs 25 is increased as described above.

Here, the reinforcing ribs 25 are arranged in the central portions of the high pressure side blade surface member and the low pressure side blade surface member where the stress becomes high when the guide vane 1 is used, and the reinforcing ribs 25 are slot-welded by slot welding or plug welding. Alternatively, the same strength as that of the conventional structure can be ensured by joining it to the blade member on the side where the row of holes is provided. In the embodiment shown in FIGS. 1 and 2, the reinforcing ribs 25 are attached to the low-pressure side blade surface member 13 by welding, while the high-pressure side blade surface members 22 and 32 are provided with hole rows including slots 26 and holes 28, respectively. The high-pressure side blade surface members 22 and 32 are joined to the reinforcing ribs 25 by slot welding or plug welding. On the contrary, the reinforcing ribs are welded and attached to the high-pressure side blade surface member while the low-pressure side blade surface member is slotted or Even if the row of holes is provided and the low-pressure side blade member is joined to the reinforcing rib by slot welding or plug welding, the same effect as described above can be obtained.

[0016]

As is apparent from the above description, according to the present invention, the high-pressure side blade surface member and the low-pressure side blade surface member of the guide vane are formed as a single plate, and the reinforcing rib is welded to either one of the blade surface members. The other wing surface member is provided with a hole row composed of slots or holes at a position facing the reinforcing rib of this wing surface member, and the reinforcing rib and this wing surface member are slot welded by the slot or by a hole. Since they are joined by plug welding, the blade surface member can be made into a single plate. As a result, the number of parts and the welding length are reduced, so that the production time can be shortened and the production accuracy can be greatly improved. You can

Further, a reinforcing rib is provided in the central portion of the blade surface member where the stress of the guide vane is high and the reinforcing rib is joined to the blade surface member by slot welding or plug welding, so that the same strength as the conventional structure is obtained. Obtainable.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of a guide vane of a water turbine according to an embodiment of the present invention.

FIG. 2 is an exploded perspective view of a guide vane of a water turbine according to another embodiment of the present invention.

FIG. 3 is an exploded perspective view of a conventional water turbine guide vane.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Guide vane 12 High pressure side blade surface member 13 Low pressure side blade surface member 22 High pressure side blade surface member 25 Reinforcing rib 26 Slot 28 Hole 32 High pressure side blade surface member

Claims (2)

[Claims] 1. A guide vane of a water turbine having a blade surface having a high-pressure surface and a low-pressure surface, for adjusting the amount of water flowing into a runner,
The high-pressure side blade surface member forming the high-pressure surface and the low-pressure side blade surface member forming the low-pressure surface are each formed of a single plate, and a reinforcing rib is welded to one of the high-pressure side blade surface member and the low-pressure side blade surface member. , The other wing surface member is provided with a slot or hole row at a position facing the reinforcing rib of this wing surface member, and the reinforcing rib and this wing surface member are slot welded through the slot or through holes of the hole row Guide vanes for water turbines, which are joined by plug welding. 2. The reinforcing rib according to claim 1, wherein the reinforcing rib is provided at a central portion of the high pressure side blade surface member and the low pressure side blade surface member,
A guide vane for a water turbine, characterized in that a blade surface member provided with a slot or a row of holes is joined to a reinforcing rib by slot welding or plug welding.