JP2007040256A - Manufacturing method for runner blade and runner blade - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce the manufacturing cost of a runner blade of a cross flow turbine. <P>SOLUTION: In this runner blade 5 of the cross flow turbine 1 provided with a water leading pipe 2 for introducing flowing water from a water channel and a runner 3 supported by a rotary shaft 4 and rotating by receiving flowing water introduced by the water leading pipe 2 on the runner blade 5, a metallic flat plate is bent along a predetermined curved face to form the blade. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a method for producing a runner blade and a runner blade used in a once-through water turbine having a water conduit and a runner. More specifically, the present invention relates to an improvement in the shape of a runner blade.

  As a water turbine used for hydroelectric power generation, there is a once-through water turbine provided with a water guide pipe that introduces running water from a water channel and a runner that rotates by running water introduced by a water guide pipe having a plurality of runner blades. The runner blades are formed in a curved shape. Some of the runner blades formed in such a curved shape are manufactured by machining or casting. For example, a runner blade for a water turbine described in Patent Document 1 is manufactured by casting together with a runner crown.

Japanese Patent Laying-Open No. 2001-304088 (FIG. 1)

  However, if such a curved runner blade is manufactured by casting as in Patent Document 1, the manufacturing cost is increased.

  The objective of this invention is providing the manufacturing method and runner blade of a runner blade which can reduce manufacturing cost.

Means for Solving the Problems and Effects of the Invention

  A method for producing a runner blade according to the present invention is a cross-flow turbine equipped with a water guide pipe for introducing running water from a water channel, and a runner supported by a rotating shaft and rotated by the runner blade receiving the running water introduced by the water guide pipe. The method for manufacturing the runner blade includes a bending step of bending a metal flat plate along a predetermined curved surface.

  According to this, a runner blade | wing can be manufactured by the bending process with respect to a metal flat plate. For this reason, manufacturing cost can be reduced compared with the case where it manufactures by cutting and casting.

  In the runner blade manufacturing method of the present invention, in the folding step, the flat plate may be bent by bringing the jig into contact with a position to be bent on one surface of the flat plate and pushing the jig into the flat plate side. According to this, the runner blade can be manufactured by a simple bending process using a jig, and the manufacturing cost can be further reduced.

  The runner blade of the present invention includes a water conduit that introduces running water from a water channel, and a runner that is supported by a rotating shaft and that receives the running water introduced by the water conduit and is rotated by the runner blade. The metal flat plate is bent along a predetermined curved surface.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a side view showing a once-through water turbine 1 according to the present embodiment. The once-through water turbine 1 has a water guide pipe 2 and a runner 3. The water guide pipe 2 introduces water from a channel such as a river. Water flows into the runner 3 from the water conduit 2 (arrow A in FIG. 1). The runner 3 includes two rotating plates that are rotatably supported around a rotating shaft 4 and a plurality of runner blades 5 that are sandwiched between the rotating plates and attached along the outer edge of the rotating plate. .

  As shown in FIGS. 2 and 3, each runner blade 5 is formed by bending a metal flat plate along a predetermined curved surface 6 (reference surface). Here, it is formed in a polygonal line shape protruding in the rotation direction of the runner 3 when viewed from the direction along the rotation axis 4. The shape here can be circumscribed on the curved surface 6 as shown in FIG. 2, or can be inscribed on the curved surface 6 as shown in FIG. Further, the lengths of the straight portions when bent may be the same or different. However, in consideration of the rotation efficiency with respect to the water flow, the bending positions are preferably two or more.

  Here, the operation of the once-through water turbine 1 will be described. During operation of the once-through water turbine 1, water flows from the water conduit 2 into the runner 3. Thus, the water acts to push down the runner blade 5 (arrow A in FIG. 1), and further, the water that flows into the runner 3 acts to push up the runner blade 5 (in FIG. 1). , Arrow B). Therefore, the runner 3 rotates around the rotation shaft 4. For example, a generator is attached to the runner 3, and power is generated by the rotation of the runner 3.

  Next, a method for manufacturing the runner blade 5 will be described. In order to manufacture the runner blade 5, a metal flat plate is bent to a predetermined curved surface 6 (bending step). Here, as shown in FIG. 2, the jig 7 is brought into contact with a position to be bent on one surface of the flat plate, and the flat plate is bent by pushing the jig 7 into the flat plate side. As the jig 7, a tapered one is used. Then, the jig 7 is brought into contact with one of a plurality of positions where the flat plate is to be bent, pressed and bent toward the flat plate, and then the jig 7 is similarly brought into contact with another position and pushed in. Steps are repeated to bend the flat plate.

  As described above, according to the present invention, the runner blade can be manufactured by bending a metal flat plate. For this reason, manufacturing cost can be reduced compared with the case where it manufactures by cutting and casting.

  Moreover, since the runner blade is manufactured by bending the metal plate by a simple method of pressing the jig 7 in contact with the flat plate, the manufacturing cost of the runner blade can be further reduced. .

  The preferred embodiments of the present invention have been described above. However, the present invention is not limited to the above-described embodiments, and various design changes can be made as long as they are described in the claims.

It is a side view which shows the once-through water turbine which concerns on embodiment in this invention. It is a side view which shows the runner blade | wing circumscribed on a curved surface. It is a side view which shows the runner blade | wing inscribed in a curved surface.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Flow-through turbine 2 Water guide pipe 3 Runner 4 Rotating shaft 5 Runner blade 6 Curved surface 7 Jig

Claims (3)

  In the method of manufacturing a runner blade of a once-through water turbine, comprising a water guide pipe for introducing running water from a water channel and a runner supported by a rotating shaft and receiving the run water introduced by the water guide pipe to the runner blade and rotating. The manufacturing method of the runner blade | wing characterized by having a bending process which bends the flat plate of this so that it may follow a predetermined curved surface.   2. The runner blade according to claim 1, wherein in the bending step, a jig is brought into contact with a position to be bent on one surface of the flat plate, and the flat plate is bent by pushing the jig into the flat plate side. Production method. In the runner blade of a cross-flow turbine provided with a water guide pipe for introducing running water from a water channel and a runner supported by a rotating shaft and received by the runner blade for rotation by the runner blade, a metal flat plate is provided. A runner blade that is bent along a predetermined curved surface.

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