JPH05113168A - Cross flow water wheel - Google Patents

Abstract

PURPOSE:To prevent diversion loss and collision loss at a guide vane in a cross flow water wheel equipped, at the upstream side of its runner, with the guide vane, by providing on the upstream side of the guide vane a diversion vane for causing diverging of water flowing to the guide vane. CONSTITUTION:In a cross flow water wheel as a hydraulic power energy recovery means which is utilized for a power generation system, a diversion vane 11 for diverging the water flowing to a guide vane 5 intended for adjusting the amount of water flowing into a runner 1 is provided in an inlet pipe 4 located on the upstream side of the guide vane 5. An upstream-side tip end 12 of this diversion vane 11 is acutely pointed, and a downstream-side tip end 13 is so shaped as to cover an upstream side of the guide vane 5. By this, before the water flowing from the inlet pipe 4 reaches the guide vane 5, it is made to diverge, by the diversion vane 11, into upper and lower streams of the guide vane 5 so as to reach an outer periphery of the runner 1. This prevents occurrence of diversion loss and collision loss at the guide vane 5.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a cross flow turbine.

[0002]

2. Description of the Related 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. Figure 2
Shows a cross-sectional side view of a conventional cross-flow turbine.

A runner 1, which is rotated by the potential energy of water, is supported in a casing 2 via a rotary 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 can be opened and closed on the inlet side of the casing 2 corresponding to the outlet side of the inlet pipe 4. It is provided in. 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 drawing is an air valve.

The water flowing from the inlet pipe 4 is divided into upper and lower parts of the casing 2 by the guide vanes 5, and then merges at the outer peripheral portion of the runner 1 and flows into the runner 1. The water flowing into the runner 1 is discharged from the outer periphery of the runner 1 after rotating the runner 1, and is discharged into the water through the water discharge pipe 7.

[0005]

In the conventional cross-flow turbine, the water introduced from the inlet pipe 4 is temporarily diverted by the guide vanes 5, but the diverting of the flow and the collision loss that occur at this time reduce the efficiency of the turbine. It was one of the factors. Further, since the inlet pipe 4 needs to have the strength to withstand the increase in water pressure generated when the load is cut off, reinforcing bones and the like are added, but this causes an increase in cost.

[0006]

The structure of the present invention for solving the above-mentioned problems is a guide for a cross-flow turbine having a guide vane on the upstream side of the runner for adjusting the amount of water flowing into the runner by opening and closing. It is characterized in that a flow dividing vane for dividing the water flowing into the vane is provided on the upstream side of the guide vane.

[0007]

The introduced water is diverted by the diverting vanes on the upstream side of the guide vanes to prevent diverting and collision loss in the guide vanes.

[0008]

1 is a cross-sectional side view of a cross flow turbine according to an embodiment of the present invention. The same members as those shown in FIG. 2 are designated by the same reference numerals, and duplicate explanations are omitted.

The inlet pipe 4 upstream of the guide vane 5
A split flow vane 11 for splitting the water flowing into the guide vane 5 is provided in the. The shape of the upstream tip 12 of the flow dividing vane 11 is sharply sharpened, and the shape of the downstream tip (guide vane 5 side) 13 is in a state of covering the upstream side of the guide vane 5. The position of the flow dividing vanes 11 is appropriately determined based on the distribution of the flow rates of the flow above and below the guide vanes 5. Further, the position of the flow dividing vane 11 is appropriately determined such that a slight gap is formed between the downstream tip 13 and the guide vane 5 so that the downstream tip 13 does not hinder the opening / closing operation of the guide vane 5. Be done.

The flow dividing vanes 11 may be provided in the casing 2.

The water flowing in from the inlet pipe 4 is branched to the upper and lower sides of the guide vane 5 by the flow dividing vane 11 before reaching the guide vane 5, and reaches the outer peripheral portion of the runner 1. The water flowing into the runner 1 is discharged from the outer periphery of the runner 1 after rotating the runner 1, and is discharged into the water through the water discharge pipe 7.

Therefore, the flow dividing loss and the collision loss in the guide vane 5 can be prevented, and the flow dividing position is separated from the inflow position of the runner 1, so that the turbulent flow hardly occurs.
Further, by providing the flow dividing vane 11 in the inlet pipe 4,
The flow dividing vanes 11 play a role of reinforcing bones, no special reinforcing bones are required, and reliability and cost can be improved.

[0013]

In the cross flow turbine of the present invention, since the flow dividing vanes for dividing the water flowing into the guide vanes are provided on the upstream side of the guide vanes, the water can be divided on the upstream side of the guide vanes. The diversion position can be separated from the runner inflow position. As a result, it is possible to prevent split flow loss and collision loss in the guide vane, and
Turbine efficiency can be improved by reducing the influence of flow turbulence due to diversion.

[Brief description of drawings]

FIG. 1 is a sectional side view of a cross-flow turbine according to an embodiment of the present invention.

FIG. 2 is a cross-sectional side view of a conventional cross-flow turbine.

[Explanation of symbols]

 1 runner 2 casing 4 inlet pipe 5 guide vane 11 diversion vane

Claims (1)

[Claims] 1. In a cross-flow turbine equipped with a guide vane on the upstream side of the runner for adjusting the amount of water flowing into the runner by opening and closing, a diversion vane for dividing the water flowing into the guide vane is located on the upstream side of the guide vane. A cross-flow turbine characterized by being provided.