JP2007182762A - Runner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To suppress the clogging of foreign matter without complicating structure. <P>SOLUTION: A cross flow turbine 1 comprises a conduit pipe 2 leading in running water from a waterway, and a runner 3 having a plurality of runner blades 5 arranged along a rotating direction, and rotated receiving the running water led in through the conduit pipe 2, by the runner blades 5. The space between two runner blades 5a, 5b out of the plurality of runner blades 5, and the runner blades 5 adjoining the runner blades 5a, 5b upstream in the rotating direction of the runner 3 double the space between the other adjacent runner blades 5. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a runner used in a once-through water turbine having a water conduit and a runner. More specifically, the present invention relates to an improvement in a runner blade mounting structure in a runner.

  In a runner of a once-through water turbine provided with a water conduit that introduces water from a water channel and a runner that rotates by receiving water introduced by the water conduit, a plurality of runner blades are arranged at equal intervals along the circumferential direction of the runner There is something. In such a runner, foreign matters and the like are easily clogged between the blades. When the foreign matters are clogged, it is necessary to stop the runner and remove the foreign matters, and the operation rate of the once-through water turbine is lowered. In order to prevent foreign matter from being clogged between the blades, for example, in the hydroelectric power generation facility described in Patent Document 1, a screen is provided on the upstream side of the turbine, the foreign matter is captured on the screen, and the captured foreign matter is pressurized with water. It is discharged to the outside. According to this, since the foreign matter does not flow into the water turbine, the foreign matter is not clogged in the water turbine.

Japanese Unexamined Patent Publication No. 2000-161503 (FIG. 1)

  However, the foreign matter capturing method described above requires a screen for capturing the foreign matter and a discharge mechanism for discharging the foreign matter, so that the entire apparatus becomes large and the structure becomes complicated.

  Then, the objective of this invention is providing the runner which can suppress clogging of a foreign material, without complicating a structure.

Means for Solving the Problems and Effects of the Invention

  The runner of the present invention includes a water conduit that introduces running water from the water channel, and a runner that has a plurality of runner blades arranged along the rotation direction and rotates by receiving the running water introduced by the water conduit into the runner blade. It is a runner of a once-through water turbine provided, and a part of a plurality of runner blades has a larger interval with an adjacent runner blade upstream in the rotation direction of the runner than other runner blades.

  According to this, when a large foreign object flows in the part where the interval between the runner blades has increased, the foreign object passes between the runner blades, so that the runner is less likely to be clogged and the operation rate of the turbine is increased. .

  In the runner of the present invention, a runner blade having a larger interval with the runner blade adjacent in the upstream in the rotational direction than the other runner blades, and a runner adjacent to the runner blade in the upstream in the rotational direction of the runner The interval between the blades may be an integral multiple of the interval between the other runner blade and the runner blade adjacent to the other runner blade upstream in the rotation direction of the runner. According to this, a part with a large interval between adjacent runner blades can be formed without affecting other parts. Such a runner can also be formed by removing a part of the runner blades from a conventional runner having runner blades arranged at equal intervals.

  Further, in the runner of the present invention, among the plurality of runner blades, there may be two or more ones having a larger interval between the runner blades adjacent in the upstream of the runner rotation direction than the other runner blades. According to this, the foreign material which flowed into the runner from one of the portions where the interval between the adjacent runner blades is increased can be discharged to the outside from the portion where the interval between the other adjacent runner blades is increased. Therefore, it is possible to efficiently remove foreign matters.

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

  FIG. 1 is a side view showing a cross-flow turbine 1. As shown in FIG. 1, 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. As shown in FIGS. 1 and 2, the runner 3 includes a plurality of runner blades 5 disposed along the rotation direction of the runner 3 and two side plates 6 that fix both ends of the runner blade 5. FIG. 2 is a front view of the runner 3 of FIG. And the runner 3 is supported by the rotating shaft 4, receives the running water (arrow A, B in the figure) introduced by the water conduit 2, and rotates with the runner blade 5. During the operation of the once-through water wheel 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 in the clockwise direction of FIG. For example, a generator is attached to the runner 3, and power is generated by the rotation of the runner 3.

  As shown in FIGS. 1 and 2, the runner blade 5 has an interval between adjacent runner blades 5 upstream of the rotation direction of the runner 3 (counterclockwise direction in FIG. 1). There is a thing (two runner blades 5a, 5b in FIG. 1). And the interval between the runner blades 5a and 5b and the runner blades 5 adjacent to the runner blades 5a and 5b in the upstream of the rotation direction of the runner 3 is twice the interval between the other adjacent runner blades 5; The portions where the interval is increased are regions W1 and W2.

  Next, the operation when the foreign matter 7 flows into the runner 3 from the water conduit 2 will be described. However, in the following description, it is assumed that the foreign material 7 can pass through the regions W1 and W2, but cannot pass between the other adjacent runner blades 5.

  When the foreign matter 7 reaches the region W1 in the water flowing into the runner 3 from the water conduit 2, the foreign matter 7 passes through the region W1 and flows into the runner 3. Furthermore, the foreign material 7 that has flowed into the runner 3 passes through the region W2 and is discharged to the outside.

  According to the embodiment described above, the distance between the runner blades 5a and 5b and the runner blades 5a and 5b adjacent to the runner blade 5 upstream in the rotation direction of the runner 3 is the distance between the other adjacent runner blades 5. Since it is larger than that, it cannot pass between the other adjacent runner blades 5, but the foreign substance 7 having such a size that it can pass through the regions W <b> 1 and W <b> 2 passes from the water conduit 2 to the runner 3. Even if it flows in, if the foreign matter 7 reaches one of the regions W1 and W2, it flows into the runner interior 7 from the regions W1 and W2. Thereby, the runner 3 is less likely to be clogged with the foreign matter 7, and the operating rate of the once-through water turbine 1 is increased.

  Moreover, since the space | interval of the runner blade | wing 5a, 5b and the runner blade | wing 5 adjacent to the runner blade | wing 5a, 5b in the upstream of the rotation direction of the runner 3 is twice the space | interval of the other adjacent runner blade | wing 5. A portion having a large interval between adjacent runner blades can be formed without affecting the interval between other adjacent runner blades 5. Such a runner can also be formed by removing a part of the runner blades from a conventional runner having runner blades arranged at equal intervals.

  Moreover, since the area | region where the space | interval of the adjacent runner blade | wing 5 became large is provided in two places of area | region W1 and W2, the foreign material 7 which flowed in into the runner from one side of W1 and W2 is made outside from the other side. Since it can discharge | emit, the removal of the foreign material 7 can be performed efficiently.

  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.

  For example, in this embodiment, the distance between the runner blades 5a and 5b and the runner blades 5 adjacent to the runner blades 5a and 5b upstream in the rotation direction of the runner 3 is twice the interval between the other adjacent runner blades 5. However, it is not limited to this, and may be an integer multiple of 3 or more. Even in this case, a portion having a large interval between adjacent runner blades can be formed without affecting the interval between other adjacent runner blades 5. Such a runner can also be formed by removing a part of the runner blades from a conventional runner having runner blades arranged at equal intervals. Alternatively, the distance between the runner blades 5a and 5b and the runner blades 5 adjacent to the runner blades 5a and 5b in the upstream of the rotation direction of the runner 3 is an integral multiple of the interval between the other adjacent runner blades 5. I can't.

  Moreover, in this embodiment, although the area | region where the space | interval of the adjacent runner blade | wing 5 is large is provided in two places, area | region W1, W2, the part where the space | interval of the adjacent runner blade | wing 5 is large is 3? There may be more or less places. Even in this case, the foreign matter 7 that has flowed into the runner 3 from one of the regions where the interval between the adjacent runner blades 5 is large is discharged from any of the regions where the interval between the other adjacent runner blades 5 is large. can do. Alternatively, only one region where the interval between adjacent runner blades 5 is large may be provided. In this case, the foreign matter 7 that has flowed into the runner 3 from the region where the interval between the adjacent runner blades 5 is large rotates with the foreign matter 7 remaining in the runner 3, and the runner adjacent to the foreign matter 7. When the region where the interval between the blades 5 is large overlaps, the foreign matter 7 is discharged to the outside.

It is a side view showing a cross-flow water turbine provided with a runner and a blade unit of the present invention. It is a front view of the runner of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Flow-through turbine 2 Water guide pipe 3 Runner 4 Rotating shaft 5 Runner blade 6 Side plate 7 Foreign object

Claims (3)

A once-through water turbine comprising a water guide pipe for introducing running water from a water channel, and a runner having a plurality of runner blades arranged along a rotation direction and rotating the run water introduced by the water guide pipe by the runner blades. A runner,
A part of the plurality of runner blades has a larger interval between adjacent runner blades upstream in the rotation direction of the runner than other runner blades.   The distance between the runner blade that is adjacent to the runner blade adjacent to the upstream in the rotational direction relative to the other runner blade and the runner blade adjacent to the runner blade upstream in the rotational direction of the runner is 2. The runner according to claim 1, wherein the runner blade is an integral multiple of a distance between another runner blade and the runner blade adjacent to the other runner blade upstream in the rotation direction of the runner.   The two or more of the plurality of runner blades have a larger interval between adjacent runner blades upstream in the rotation direction of the runner than the other runner blades. Runner described in.

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