JP4111142B2 - Horizontal axis single wheel front entrance double flow Francis turbine - Google Patents

Description

  The present invention relates to a horizontal axis single-wheel front-open double-flow Francis turbine that can be used effectively when installed in a hydroelectric power plant and is replaced with a double-axis front-wheel twin Francis turbine that has passed its service life.

  The type of turbine for power generation installed in the hydroelectric power plant is determined according to the location conditions of the power plant construction site. The horizontal two-wheel front twin Francis turbine installed in a relatively low-head water channel uses a cylindrical casing instead of a spiral casing. Further, the two-wheel front twin twin Francis turbine on the horizontal axis has two sets of guide vanes and guide vane operating mechanisms for controlling the amount of water to the runner, and two runners are arranged on both side ends of the main shaft. Such a horizontal axis turbine is described in Patent Document 1 below.

  Fig. 2 shows the installation situation of a conventional two-wheel front twin twin Francis turbine.

  In FIG. 2, 10 is a casing, 11 is a water conduit for introducing water from upstream into the casing 10, 12 is a generator, 13 is a thrust bearing, 14 is a connecting shaft, 15 is a drain pipe, and 16 is installed on the ground 17. The concrete foundation portion is for generating electricity by rotating the generator 12 by a water turbine installed inside the casing 10.

  FIG. 3 shows the details of the two-wheel front twin twin Francis turbine.

  The main shaft 20 is integrated by fitting and fixing two runners 22 and 23 in the vicinity of both ends, and both ends are pivotally supported by a thrust bearing 13 and a guide bearing 29. A generator 12 is coupled to the left side of the thrust bearing 13 via a connecting shaft 14.

  The guide vanes 24 and 25 are disposed on the outer circumferences of the runners 22 and 23, and are controlled by operating mechanisms 26a and 26b. The guide vanes 24 and 25 adjust the flow rate of the water W introduced into the water conduit 11 to the runners 22 and 23. The two suction pipes 27 and 28 are partitioned by a central wall to form a twin flow path to the left and right.

  When the water w indicated by the white arrow flows in from the water conduit 11, it is introduced into the left and right runners 22 and 23 via the guide vanes 24 and 25 to rotate the main shaft 20. And the water w which flowed down the suction pipes 27 and 28 is discharged | emitted downstream from the drain pipe 15 installed in the lower side of the suction pipes 27 and 28. FIG.

JP-A-6-137253

  The prior art horizontal two-wheel front twin twin Francis turbine has many parts that are immersed in water, and the guide vane operating mechanism is particularly submerged. When parts are inspected or replaced, it is necessary to temporarily stop the water intake and drain the casing water, resulting in poor maintainability. Further, since the guide vane operating mechanism is submerged in water, there is also a problem that its life is shorter than that in the case of being used in the atmosphere.

  When renewing such a horizontal shaft two-wheel front twin Francis turbine, it is desirable to maintain good workability, streamline the work, and shorten the repair time without changing the hydraulic pipes, buildings, and main engine layout of the existing equipment.

  An object of the present invention is to provide a horizontal axis single-wheel front-open double-flow Francis turbine with good maintainability by reducing the repair work of existing facilities.

A feature of the present invention is that a horizontal axis single-wheel front-open double-flow Francis turbine that is renewed in place of a horizontal two-wheel front twin twin Francis turbine installed in a hydroelectric power plant is a guide vane operation for controlling a guide vane. mechanism is provided outside the casing, at least, the drainage tube position of the discharge water pipe to drain water from the conduit position and draft tube of water conduit for introducing water into the casing therewith compatible horizontal axis two-wheel front opening twin Francis turbine There is in having it.

  In the present invention, the horizontal axis single-wheel front-mouth double-flow Francis turbine used for renewal is provided with a guide vane operating mechanism outside the casing, and the conduit and drain pipe positions are compatible with the horizontal-axis two-wheel front-entrance twin Francis turbine. Therefore, it is possible to improve the maintainability by reducing the repair work of the existing equipment.

  In the present invention, the horizontal axis single-wheel front-mouth double-flow Francis turbine used for renewal is provided with a guide vane operating mechanism in the atmosphere, and the water guide pipe position and drain pipe position are compatible with the horizontal-axis two-wheel front mouth twin Francis turbine. Therefore, it is possible to improve the maintainability by reducing the repair work of the existing equipment.

  Instead of replacing the horizontal two-wheel front twin twin Francis turbine installed in the hydroelectric power plant, a horizontal single-wheel front double-flow Francis turbine is used. The horizontal shaft single-wheel front-port double-flow Francis turbine is fixed with a casing installed on the concrete foundation, a water conduit that introduces water into the casing, and a double-flow runner that splits the shaft left and right in the approximate center of the shaft. From the main shaft, guide vanes arranged on the outer periphery of the runner, an operation mechanism that is provided outside the casing and controls the guide vanes, and a suction pipe and a suction pipe that split the water introduced into the runner at the central part and join downstream And a water pipe for draining water. At least, the water conduit position and the drain pipe position are compatible with the renewed horizontal two-wheel front twin twin Francis turbine.

  FIG. 1 shows an embodiment of the present invention. FIG. 1 is a configuration diagram of a horizontal axis single-wheel front-open double-flow Francis turbine according to the present invention.

  In FIG. 1, the same reference numerals as those in FIGS. 2 and 3 show the equivalents, and the casing 10 is formed to the substantially central portion of the main shaft 1 and shorter than the two-wheel front-opening twin Francis turbine shown in FIGS. Yes. The casing 10 and the water conduit 11 are installed on the concrete foundation 16. The position of the water conduit 11 is configured to be compatible with the horizontal axis two-wheel front opening twin Francis turbine shown in FIG.

  The horizontal main shaft 1 is fitted and fixed at a substantially central portion with a double flow type runner 2 for diverting water left and right in the axial direction. The main shaft 1 is supported by a guide bearing 3 at the right end in the figure, and is supported by a thrust bearing (not shown) as shown in FIGS. The left end of the main shaft 1 is pivotally supported by a thrust bearing and is connected to the generator 12 via a connecting shaft 14 as shown in FIGS. The height of the main shaft 1 is the same as that of the existing equipment so that the shaft position of the generator 12 can be connected without adjusting the height.

The guide vane 5 is provided at the outer periphery of the double-flow runner 2 that diverts the introduced water to the left and right in the axial direction at a substantially central portion of the main shaft 1. The operation mechanism 4 of the guide vane 5 is installed outside the casing 10 above and below the main shaft 1. The suction pipe 6 branches at the center and forms a flow path that joins downstream. The suction pipe 6 is a water discharge channel for the water W introduced into the runner 2, and a drain pipe 15 is provided in the lower central part. The drain pipe 15 is installed at the same position as the existing equipment.
In this configuration, when the water w indicated by the white arrow flows into the casing 10 from the water conduit 11, the water w is introduced into the runner 2 through the guide vanes 5 to rotate the main shaft 1. The water w that has passed through the runner 2 is discharged downstream from the drain pipe 15 installed below the suction pipe 6 through the suction pipe 6.

  The horizontal axis single-wheel front-mouth double-flow Francis turbine having such a configuration is used in place of the horizontal-axis two-wheel front-mouth twin Francis turbine, and is updated from the position of the inlet pipe and the inlet pipe of the inlet pipe for introducing water into the casing. Since the drain pipe position of the water pipe that drains water is compatible with the two-wheel front twin twin Francis turbine, it is possible to improve the maintainability by reducing the repair work of the existing equipment. Further, since the guide vane operating mechanism is provided outside the casing, the maintainability can be improved.

  Moreover, since the horizontal axis single-wheel front-port double-flow Francis turbine has one runner and one guide vane operating mechanism, the number of parts can be reduced.

It is a block diagram which shows one Example of this invention. It is a side view which shows an example of the existing installation. It is an example block diagram of the horizontal axis two-wheel front opening twin Francis turbine in existing facilities.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Main shaft, 2 ... Double flow type runner, 3 ... Guide bearing, 4 ... Guide vane operation mechanism, 5 ... Guide vane, 6 ... Suction pipe, 10 ... Casing, 11 ... Conduit pipe, 15 ... Drain pipe, 16 ... Concrete foundation Department.

Claims (1)

A horizontal axis Francis turbine that is renewed in place of the horizontal axis two-wheel front twin Francis turbine installed in a hydroelectric power plant, a casing installed in a concrete foundation, and a water conduit for introducing water into the casing A main shaft to which a double-flow type runner for diverting axially right and left at a substantially central portion of the shaft is fixed, a guide vane disposed on the outer periphery of the runner, and the guide vane provided outside the casing to control the guide vane An operation mechanism; a suction pipe that divides water introduced into the runner at a central portion and joins it downstream; and a drain pipe that drains water from the suction pipe, at least the position of the water guide pipe and the drain the horizontal axis single wheel Maeguchi double flow Francis turbine position of the tube, characterized in that it has a same compatibility of the horizontal axis two-wheel front opening twin Francis turbine.

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