JP5146973B1 - Water turbine - Google Patents

Abstract

An overlying water turbine capable of obtaining a high output while suppressing an increase in size of the water turbine as much as possible is provided.
A turbine blade 15 is laid in a direction opposite to the rotation direction, and an angle formed between an upper portion 5b and a lower portion 15a of the turbine blade 15 is set in a range of 135 to 155 degrees, and the rotation direction of the upper portion 15b is reversed. This is a top water wheel having a laying angle in the direction larger than that of the lower portion 15a. In this upper water turbine, the mounting angle of the lower portion 15a is preferably set in the range of 75 degrees to 50 degrees with respect to the radial axis L, and the water retaining weir 17 is more preferably provided at the tip of the water turbine blade 15. Good.
[Selection] Figure 1

Description

  The present invention relates to a top water turbine. More specifically, the present invention relates to a top water turbine that can obtain a high output.

  2. Description of the Related Art Conventionally, an overlying water turbine that rotates by receiving water and uses the rotational force for power generation or milling is known. An example is shown in FIG.

  In the water wheel shown in FIG. 4, a water wheel bottom plate 2 is provided on the inner peripheral portion of a pair of opposed wheel plates 1 (only one is shown in the figure), and a required number of water wheel blades 3, 3 are provided around the water wheel bottom plate 2. 3,... Are arranged at equal intervals with respect to the radial axis to form a turbine wheel body, and the turbine wheel body is fixed to the rotating shaft 6 via a support member 5 provided on the turbine wheel body. Yes.

  Since the wheel plate 1, the turbine bottom plate 2 and the turbine blades 3, 3, 3,... Are disposed in such a positional relationship, the wheel blades 3 and 3 adjacent to the wheel plate 1 and the turbine bottom plate 2 Bucket 4 is formed.

  Thus, according to the above-described overturning turbine, when water is accumulated in the bucket 4 due to falling water, the turbine body starts to rotate in the falling direction due to the falling force and the weight of the water accumulated in the bucket 4. Next, water sequentially accumulates in the succeeding bucket 4 along with the rotation, and the water turbine body continues to rotate by repeating the same action. Further, water is discharged from the bucket 4 that has moved downward as the water turbine body rotates to a water channel (not shown), and the amount of water decreases.

  Another example of such a top water turbine is disclosed in Patent Document 1.

  However, in the conventional turbine body, since the storage volume of the bucket 4 is small, there is a limit to the application of rotational force due to its own weight, and although there is no problem with milling or the like, it is applied for power generation that requires a large output. There is a problem that it is impossible.

JP-A-2005-330919

  The present invention has been made in view of the problems of the prior art, and an object thereof is to provide an overlying water turbine capable of obtaining a high output while suppressing the increase in size of the water wheel as much as possible.

According to the present invention , in the water turbine , the turbine body is provided with a turbine bottom plate on the inner peripheral portion of a pair of opposed wheel plates, and a required number of turbine blades are equiangular with respect to the radial axis around the turbine bottom plate. The turbine blades are laid out at equal intervals in the direction opposite to the rotation direction, and the angle between the inner peripheral end of the turbine blade and the inner peripheral end and the outer peripheral end of the turbine blade is between The angle formed with the attachment angle of the central portion is set in a range of 135 degrees to 155 degrees, and the attachment angle of the inner peripheral end is set in a range of 75 degrees to 45 degrees with respect to the radial axis .

  In the overlying water wheel of the present invention, it is preferable that a water retaining weir is provided at the tip of the water wheel blade.

  Furthermore, in the overlying water wheel of the present invention, it is preferable that the ring plate is formed in a donut plate shape, and the amount of water stored in the bucket is increased by reducing the inner diameter thereof.

  Since the top water turbine according to the present invention is configured as described above, it is possible to obtain an excellent effect of increasing the output while avoiding an increase in the outer shape of the top water turbine.

  In a preferred embodiment of the present invention in which a retaining weir is provided at the tip of the water turbine blade, the reduction of the stored water in the bucket can be delayed, and an excellent effect of further increasing the output can be obtained. .

It is a center longitudinal cross-sectional view of the top water turbine which concerns on one Embodiment of this invention. It is the schematic of the watermill blade of the other example of this invention. It is the front-end | tip part schematic of the watermill blade of the further another example of this invention. FIG. 2 is a view corresponding to FIG. 1 showing a conventional water turbine.

  Hereinafter, although the present invention is explained based on an embodiment, referring to an accompanying drawing, the present invention is not limited only to this embodiment.

  FIG. 1 shows a central longitudinal cross-sectional view of an overlying water wheel (hereinafter simply referred to as a water wheel) according to an embodiment of the present invention.

  The turbine is mainly composed of a turbine body 10, a support member 11 provided integrally with the turbine body 10, and a rotating shaft 12 provided in the center of the support member 11 so as to project in a direction orthogonal to the turbine body 10. The rotating shaft 12 rotates as the turbine body 10 rotates.

  The turbine body 10 is composed of a pair of opposed wheel plates 13 and 13, a turbine bottom plate 14, and a required number of turbine blades 15, 15, 15,.・ Including.

  The annular plate 13 is, for example, a donut disc shape, and the size thereof is increased so as to be a stored water amount that can obtain a desired output. That is, as shown in the figure, the amount of stored water is increased by making the inner diameter smaller than the conventional one while keeping the outer dimension of the ring plate 13 the same as the conventional one. Here, the ratio between the inner diameter and the outer diameter is set to a range of 2/5 to 3/5, for example.

  The turbine bottom plate 14 is, for example, cylindrical or polygonal cylindrical. The number of corners of the polygon is made to coincide with the number of water turbine blades 15 as shown in the figure. The wheel plates 13 and 13 are fitted into both ends of the water turbine bottom plate 14 in a watertight manner.

  The base end of the water turbine blade 15 is joined to the outer periphery of the water turbine bottom plate 14 in a watertight manner, and the side end is joined to the inner surface of the wheel plate 13 in a watertight manner, whereby a bucket 16 is formed.

  The number of water turbine blades 15 is 18 in the illustrated example, and each is attached at an equal angle.

  In the illustrated example, the shape of the water turbine blade 15 is such that the upper half of the turbine blade 15 has a “ku” shape with the laying angle in the direction opposite to the rotation direction being increased. However, the shape of the water turbine blade 15 is not limited to the “<” shape, and the corners may be arcuate as shown in FIG. 2.

  The laying start position of the upper portion 15b is not strictly limited to the center, and may be near the center. In other words, a margin of about 10% from the center to the front and back can be recognized.

  The angle at which the upper portion 15b is laid is such that the angle θ2 formed by the upper portion 15b and the lower portion 15a is in the range of 145 degrees to 155 degrees. Further, the laying angle of the lower portion 15a, that is, the mounting angle θ1, that is, the angle formed with respect to the radial axis L is set to be in the range of 45 degrees to 55 degrees.

  Although illustration is omitted, when the number of turbine blades 15 is 12, the angle θ2 formed by the upper portion 15b and the lower portion 15a is set to be in the range of 135 degrees to 145 degrees. Further, the laying angle θ1 of the lower portion 15a, that is, the angle formed with respect to the radial axis L is set in a range of 65 degrees to 75 degrees. When the number of water turbine blades 15 is 16, the angle θ2 formed by the upper portion 15b and the lower portion 15a is set to be in the range of 140 degrees to 150 degrees. Further, the laying angle θ1 of the lower portion 15a, that is, the angle formed with respect to the radiation axis L is set to be in the range of 50 degrees to 60 degrees.

  The reason for this is to improve the efficiency of taking in falling water and to increase the retention time of the stored water.

  The number of turbine blades 15 is not limited to an even number, and an odd number can be obtained by appropriately setting the angle θ2 formed by the upper portion 15b and the lower portion 15a and the laying angle θ1 of the lower portion 15a, that is, the angle formed by the radial axis L. It can also be a sheet.

  Further, in order to delay the start of water discharge, for example, as shown in FIG. 1, a water retaining weir 17 may be provided at the tip of the water turbine blade 15 in a tangential direction (a direction opposite to the rotation direction). In this case, the width of the water retaining weir 17 (the length in the tangential direction) is about one third of the distance between the peripheral end portions between the adjacent water turbine blades 15 and 15 so that water can easily flow into the bucket 16. Is preferable.

  Thus, for example, when water is stored in the bucket 16 due to the water falling from the water falling channel 18 as shown in FIG. 1, the turbine body 10 rotates in the water falling direction due to the water falling force and the weight of the water stored in the bucket 16. start. Following the rotation, the subsequent buckets 16 are sequentially stored and the rotation is continued.

  Since the capacity of the bucket 16 is increased as described above, the weight of the stored water in the bucket 16 also increases, and the rotational force, that is, the output of the turbine body 10 increases. At that time, the amount of stored water in the bucket 16 starts to decrease when the rotation angle increases and the value exceeds a certain amount. However, since the laying angle of the upper part 15b of the water turbine blade 15 is made larger than that of the lower part 15a, the decrease in the amount of stored water in the bucket 16 is gentle. As a result, the output of the turbine body 10 can be further increased.

In a preferred embodiment of the present invention in which the water retaining weir 17 is provided, the water level S2 of the stored water in the bucket 16 can be made higher than the water level S1 when there is no water retaining weir 17, and the bucket 16 The start of water reduction in the stored water can be sent, and the output can be further increased.
Therefore, if this water turbine is connected to a generator, an increase in the amount of power generation is expected.

  As mentioned above, although this invention has been demonstrated based on embodiment, this invention is not limited only to this embodiment, A various change is possible.

  For example, in the present embodiment, the wheel plate 13 is integrated by fitting to the turbine bottom plate 14, but the end surface of the water turbine bottom plate 14 is integrated by watertightly joining the inner surface of the wheel plate 13. It may be made like.

  Moreover, as shown in FIG. 3, the attachment part to the waterwheel blade 15 of the water retaining weir 17 can also be made into circular arc shape.

  Since the upper water turbine of the present invention can provide high output, it can be applied to hydroelectric power generation using natural rivers.

10 Turbine body 13 Wheel plate 14 Turbine bottom plate 15 Turbine blade 16 Bucket 17 Water retaining weir L Radiation axis θ1 Lower mounting angle θ2 Lower and upper corners S1, S2 Water level

Claims (3)

In the upper water turbine, the turbine body is provided with a turbine bottom plate on the inner periphery of a pair of opposed wheel plates, and a required number of turbine blades are equidistant from the radial axis around the turbine bottom plate. The turbine blade is laid in the direction opposite to the rotation direction, and the mounting angle of the inner peripheral end of the turbine blade and the central portion between the inner peripheral end and the outer peripheral end of the turbine blade are attached. Set the angle made with the angle in the range of 135 degrees to 155 degrees,
The upper water turbine according to claim 1, wherein a mounting angle of the inner peripheral end is set in a range of 75 degrees to 45 degrees with respect to a radial axis . The top water turbine according to claim 1, wherein a water retaining weir is provided at a tip of the water turbine blade. The top water turbine according to claim 1, wherein the ring plate is formed in a donut plate shape, and the amount of stored water in the bucket is increased by reducing the inner diameter thereof.

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