JPH0710468U - Cross flow turbine guide vanes - Google Patents

Abstract

(57) [Abstract] [Purpose] To reduce the thermal deformation caused by welding to improve quality and to facilitate manufacturing. [Structure] The guide vane shaft 22 is provided with a prism portion 23, the guide vane 21 is welded to the prism portion 23, and the rotational force due to opening and closing and water pressure is applied to both the shear strength of the corner portion of the prism portion 23 and the welding strength of the weld portion. The power is transmitted to ensure the strength against rotational force transmission with a small number of welded parts, facilitates the welding work, reduces thermal deformation due to welding, improves quality, and facilitates manufacturing.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a guide vane for a cross flow turbine.

[0002]

[Prior art]

 A power generation system using a cross-flow turbine is known as a part of hydraulic energy recovery. A conventional cross-flow turbine will be described with reference to FIG. FIG. 8 shows a cross-sectional side view of a cross-flow turbine equipped with a conventional guide vane.

A runner 1 which is rotated by the potential energy of water is supported in a casing 2 via a rotating shaft 3. An upper nozzle 2 a is extended from the casing 2 between the casing 2 and the outer peripheral surface of the upper portion of the runner 1 in order to prevent water leakage and water flow scattering. An inlet pipe 4 is connected to the casing 2 on the upstream side of the runner 1, and a guide vane 5 for adjusting the amount of water entering the runner 1 is provided on the inlet side of the casing 2 corresponding to the outlet side of the inlet pipe 4. It is opened and closed. On the downstream side of the runner 1, another casing 6 is connected to the casing 2, and a water discharge pipe 7 depending on these casings 2 and 6 is connected. The water discharge pipe 7 is guided into water. Reference numeral 8 in the figure is an air valve.

The water flowing from the inlet pipe 4 is adjusted by the guide vanes 5 and flows into the runner 1. The water flowing into the runner 1 is discharged from the outer periphery after the runner 1 is rotated and is discharged through the water discharge pipe 7 into the water. Is discharged to.

The guide vane 5 of the above-described cross-flow turbine is welded and fixed to a cylindrical guide vane shaft 10 as shown in FIGS. 9 and 10. As a structure of the guide vane, as shown in FIGS. 11 and 12, a guide vane 13 in which a rim plate 11 is welded to a guide vane shaft 10 and a side plate 12 is attached to the outer periphery of the rim plate 11 is also used. . The guide vanes 5 and 13 are opened and closed by rotating the guide vane shaft 10 via a drive mechanism (not shown) to adjust the amount of water flowing into the runner 1.

[0006]

[Problems to be solved by the device]

 The guide vane 5 (13) of the cross-flow turbine receives an operation force for opening and closing the guide vane 5 (13) and a force due to water pressure, and a rotational force is generated by each force. This rotational force is transmitted at the welded portion of the guide vane shaft 10. Therefore, the welded portion of the guide vane shaft 10 needs to have sufficient strength to transmit the rotational force of each force, and strong welding is required.

However, since the guide vane shaft 20 has a columnar shape, the welding work is difficult, and there is a possibility that the welded portion is increased and thermal deformation occurs in order to perform strong welding. For this reason, there is a possibility that the work efficiency of manufacturing is poor and the quality is deteriorated.

[0008]

[Means for Solving the Problems]

 The structure of the present invention for solving the above-mentioned problem is that the cross section of the guide vane shaft is polygonal in the guide vane of the cross-flow turbine that opens and closes by the rotation of the guide vane shaft to adjust the amount of water flowing into the runner. Is characterized by.

[0009]

[Action]

 By making the cross section of the guide vane shaft polygonal, the transmission of the rotational force of the guide vane is given by the shear strength at the corners of the guide vane shaft.

[0010]

【Example】

 FIG. 1 shows a side surface of a guide vane according to a first embodiment of the present invention, and FIG. 2 shows its plane. In the illustrated guide vane 21, a square column portion 23 is formed on the guide vane shaft 22, and the square column portion 23 is directly welded and fixed to the square column portion 23. Therefore, the rotational force due to opening and closing and the rotational force due to water pressure are transmitted by both the shear strength of the corner portion of the prismatic portion 23 and the welding strength of the welded portion. Therefore, the strength of the welded portion can be reduced, and the strength against rotational force transmission can be secured with less welded portion. Also, since the welding is performed on the flat surface, the welding work becomes easy. After welding the guide vanes 21, the ends of the guide vane shafts 22 are processed into a cylindrical shape.

FIG. 3 shows a side surface of a guide vane according to a second embodiment of the present invention, and FIG. 4 shows its plane. In the illustrated guide vane 31, as in FIGS. 1 and 2, a prismatic portion 33 is formed on the guide vane shaft 32, a closing plate 34 is welded to the prismatic portion 33, and a side plate 35 is welded to the outer periphery of the closing plate 34. It is a thing. In the guide vanes 31 as well, the rotational force is transmitted by both the shear strength of the corner portion of the prismatic portion 33 and the welding strength of the welded portion, as described above. As shown in FIG. 5, the side plate 35 may be butt welded to the prismatic portion 33 to form the guide vane 31.

FIG. 6 shows a side surface of a guide vane according to a third embodiment of the present invention, and FIG. 7 shows its plane. Similar to FIGS. 1 to 5, the illustrated guide vane 41 has a prismatic portion 43 formed on the guide vane shaft 42, and a plurality of rim plates 44 (three in the illustrated example) are welded to the prismatic portion 43 and the rim plate is formed. A side plate 45 is welded to the outer circumference of the 44. In the guide vane 41 as well, the rotational force is transmitted by both the shear strength of the corner portion of the prismatic portion 43 and the welding strength of the welded portion similarly to the above.

Therefore, in the guide vanes 21, 31, 41 described above, since the rotational force is transmitted by both the shear strength of the corners of the prismatic portions 23, 33, 43 and the welding strength of the welds, the number of welds is small. It is possible to secure the strength for transmitting the rotational force. Also, since the welding is applied to the flat surface, the welding work becomes easy. Further, the positions of the side portions of the guide vanes 21, 31, 41 are determined by the prismatic portions 23, 33, 43, and the shapes can be easily aligned.

[0014]

[Effect of device]

 Since the guide vane of the cross-flow turbine of the present invention has a polygonal cross section of the guide vane shaft, the rotational force due to opening and closing and water pressure is transmitted by both the shear strength of the corner and the welding strength of the welded part, and less welding. The portion can secure the strength against the transmission of the rotational force, and the welding work becomes easy. As a result, thermal deformation due to welding is reduced, quality is improved, and manufacturing is facilitated.

[Brief description of drawings]

FIG. 1 is a side view of a guide vane of a cross flow turbine according to a first embodiment of the present invention.

FIG. 2 is a plan view of FIG.

FIG. 3 is a side view of a guide vane of a cross flow turbine according to a second embodiment of the present invention.

FIG. 4 is a plan view of FIG.

FIG. 5 is a side view showing another example of the second embodiment.

FIG. 6 is a side view of a guide vane of a cross flow turbine according to a third embodiment of the present invention.

FIG. 7 is a plan view of FIG.

FIG. 8 is a partially cutaway perspective view of a cross-flow turbine equipped with a conventional guide vane.

FIG. 9 is a side view of a conventional guide vane.

FIG. 10 is a plan view of FIG.

FIG. 11 is a side view of a conventional guide vane.

12 is a plan view of FIG.

[Explanation of symbols]

 21, 31, 41 Guide vanes 22, 32, 42 Guide vane shafts 23, 33, 43 Prismatic columns 34 Closing plates 35, 45 Side plates 44 Rim plates

Claims (1)

[Scope of utility model registration request] 1. A guide vane of a cross-flow turbine, wherein the guide vane shaft is opened and closed to adjust the amount of water flowing into the runner, wherein the guide vane shaft has a polygonal cross section. Guide vane.