JPH0518344A - Crossflow water wheel - Google Patents

Abstract

PURPOSE:To always keep efficiency of a crossflow water wheel at a maximum and also stabilize the driving force by keeping water balance proper between the inflow side and the closure side. CONSTITUTION:An arcuate channel 22 along part of the outer periphery of a runner 3 is made in one of the two water wheel covers 20 provided on both sides of an inlet pipe 1. A water flow regulating plate 21 in curved form covering the outer periphery of the runner 3 is provided inside the inlet pipe 1, penetrating through the groove 22 from outside, silidably in the axial direction of the runner. A water flow guide plate 24 for partitioning flow paths inside the flow pipe in the axial direction of the runner 3 is installed integrally at the insertion end of the water flow regulating plate 21. The water flow regulating plate 21 and the water flow guide plate 24 are moved back and forth in the axial direction of the runner 3 steplessly by reciprocating a driving lever 25 with a servomotor or the like.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a crossflow turbine having a runner installed such that the axis of the waterflow direction intersects with the axis of the shaft, and more particularly to a crossflow turbine having an improved flow rate adjusting device.

[0002]

2. Description of the Related Art As is well known in the art, in a cross-flow turbine with a runner installed so that the water flow direction intersects the axis, the runner must be installed in order to operate the turbine efficiently according to the flow rate. Equipped with a water flow control device to control the water flow rate.

FIG. 3 and FIG. 4 show an example of a conventional cross-flow turbine equipped with such a flow rate adjusting device.
In these figures, a runner 3 is installed at the tip nozzle 2 portion of the inlet pipe 1 through which the drive water is circulated so that the axial direction intersects the water flow direction a. Both ends of the runner 3 are inlet pipes 1
Is supported by a bearing 5 provided on a bearing stand 4 on the outer side of the.

The inlet pipe 1 is provided with a flowing water amount adjusting device 6 for adjusting the flowing water amount. In this example, the flow rate adjusting device 6 is a guide vane type, and for example, guide vanes 7 and 8 divided into two are provided in the axial direction of the runner 3 at a width of a ratio of 1/3 and 2/3. Then, by operating each of the guide vanes 7 and 8 with the external operation unit 9, the water flow is reduced to 1/3, 2/3 and 1 (= 1/3 +).
It can be operated by adjusting to 3 stages (2/3).

Next, FIGS. 5 and 6 show another conventional example of a cross flow turbine. In this example, the water flow rate adjusting device 6 is of a nozzle channel width changing system. That is, inside the inlet pipe 1 forming the nozzle 2, two slidable partition plates 10 and 11 which are plate-shaped in a nozzle shape are supported by two guide stays 12 and a groove is formed in the inlet pipe 1. Thirteen
Two slidable partition plates 14 supported via
15 are connected to the partition plates 10 and 11 by hinges 16, respectively. Then, by operating the screw rods 17 and 18 provided on the back surfaces of the partition plates 10 and 11 from the outside, the flow passage width can be changed.

[0006]

However, according to the configuration of the conventional example having the guide vane type water flow rate adjusting device 6 shown in FIGS. 3 and 4, the water flowing into the inlet pipe 1 at the time of one-sided closed operation. Flows laterally from the closed side to the open side and flows into the runner 3. For this reason, the flow near the partition plate 19 (see FIG. 3) holding the vane shaft inside is disturbed, and the vortex flow a ′ is generated.
As a result, the turbine efficiency decreases. Further, since the vane opening can be controlled only in three stages of the variable flow rate of 1/3, 2/3 and 1 (= 1/3 + 2/3), the optimum degree of opening according to the flow rate cannot always be obtained, and Cannot operate at maximum efficiency.

Further, in the structure of the conventional example having the water flow rate adjusting device 6 of the nozzle channel width changing system shown in FIGS. 5 and 6, although the continuous inflow rate can be adjusted steplessly, the inflow side and the closed side Therefore, since the water pressure becomes extremely unbalanced, a large driving force is required for opening / closing operation from the outside and the driving is unstable. Moreover, since the partition plates 10 and 11 are supported by the guide stays 12 in order to improve the operability, the inflow water is agitated, which adversely affects the water flow performance.

The present invention has been made in order to solve the problems of the prior art as described above. The turbine efficiency can always be kept to the maximum, and the hydraulic pressures on the inflow side and the closed side are well balanced and the driving force is stable. It is an object of the present invention to provide a cross-flow turbine that can be improved in efficiency and can improve product performance and reliability by improving efficiency.

[0009]

In order to solve the above problems, the present invention is directed to a cross flow in which a runner is installed at a tip nozzle portion of an inlet pipe through which driving water is circulated so that the runner intersects the water flow direction and the axial center. In the water turbine, wherein the nozzle portion of the inlet pipe is provided with a flowing water amount adjusting device for controlling the water supply to the runner, the flowing water amount adjusting device is one of the outer circumferences of the runners on the side face portion of the inlet pipe. A circular arc-shaped groove is formed along the section, and a curved plate-like flow rate adjusting plate that covers the outer peripheral side of the runner is slid along the axial direction of the runner from the outside into the inlet pipe through the groove. A flow guide plate is integrally provided at the end of the flow rate adjusting plate that is inserted into the inlet pipe so as to partition the flow passage in the inlet pipe in the axial direction of the runner. The amount of water flowing is controlled by a drive device installed outside the By the plate and running water guide plate is steplessly moved forward and backward along the axial direction of the runner, it is obtained by the adjustable flow path width of the inlet tube.

[0010]

[Function] Since the output of the cross-flow turbine is proportional to the axial width of the runner, if the runner width is changed to match the inflow, the speed triangle at the runner inlet will always be similar, and theoretically the turbine efficiency will be As a result, it becomes possible to operate at maximum efficiency regardless of the flow rate.

According to the above-mentioned present invention, the inflow water amount can be adjusted steplessly by operating the water flow amount adjusting plate (analog adjustment), and it can be applied to any running water condition such as when the inflow water amount is small in the dry season. However, the efficiency will not decrease.

Further, since the running water guide plate is provided at the end of the running water amount adjusting plate, the running water is not disturbed immediately before the runner. The side that is covered with the water flow control plate and has limited water flow,
Since the nozzle is blocked by the nozzle side plate and the flowing water guide plate (dead water region), and the pressure is balanced with the inflowing water side, the driving force of, for example, a servo motor as a driving device is not adversely affected.

Further, since the arcuate groove is formed by penetrating the side surface of the inlet pipe, and the water flow rate adjusting plate is inserted into the groove and taken out to the outside of the turbine cover, sliding is easy.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to FIGS. FIG. 1 is a front sectional view of a cross-flow turbine according to the present embodiment, and FIG. 2 is a side sectional view thereof. In these drawings, the same reference numerals are used for the same members as those of the conventional configuration, and the duplicated description will be omitted. ..

According to this embodiment, as shown in FIGS. 1 and 2, the inlet pipe 1 forming the nozzle 2 is surrounded by the turbine covers 20 on both sides, and the bearing pipe is provided inside the inlet pipe 1. The runner 3 is rotatably installed by the bearing 5 incorporated in the bearing 4.

Then, in the running water portion (upper part) of the runner 3,
As the flow rate adjusting device 6, an arc-shaped flow rate adjusting plate 21 having a diameter slightly larger than the outer diameter of the runner 3 and having substantially the same length as the runner length is provided. The water flow rate adjusting plate 21 is penetrated by a groove 22 that is penetrated in an arc shape in the water turbine cover 20 on one side and is taken out to the outside. In this groove 22,
O-rings 23 are fitted on the top and bottom to prevent leakage of running water from the sliding parts. Further, a nozzle-shaped running water guide plate 24 is provided at an insertion end of the running water amount adjusting plate 21 into the inside of the inlet pipe 1.
Are integrally provided by welding.

Further, on the outer side of the inlet pipe 1 of the water flow rate adjusting plate 21, a driving lever 25 as a driving device is attached to the mounting plate 2.
6 and the mounting pin 27. The drive lever 25 is connected to a drive machine (not shown), for example, a servo motor, and when the servo motor is operated,
The water flow rate adjusting plate 21 moves in the axial direction of the runner 3 (the direction of arrow b in FIG. 1), thereby adjusting the amount of coating on the runner 3 in the axial direction to adjust the water flow rate.

According to this embodiment having the above construction, the inflow water amount can be adjusted steplessly by operating the water flow amount adjusting plate 21 (analog adjustment), and when the inflow water amount is small in the dry season, etc. There is no reduction in efficiency under any running conditions.

Further, since the flowing water guide plate 24 is provided at the end of the flowing water amount adjusting plate 21, the turbulence of the flowing water immediately before the runner 3 does not occur. The side that is covered with the water flow rate adjusting plate 21 and the flow of which is restricted is blocked by the nozzle 2, the nozzle side plate 2a, and the water flow guide plate 24 (dead water region), and the pressure balances with the inflow water side, so it is used as a drive device It does not adversely affect the driving force of the servo motor of the above.

Further, an arcuate groove 2 is formed on the side surface of the inlet pipe 1.
2 is penetrated and opened, and the water flow rate adjusting plate 21 is inserted into this groove 22 and is taken out to the outside of the water turbine cover 1a, so that sliding is also easy.

Therefore, according to the present embodiment, it is possible to contribute to the improvement of the performance and the reliability of the product without lowering the efficiency of the water turbine.

Further, when this embodiment is compared with the conventional guide vane system, instead of stepped control (digital control),
Since it is possible to control the amount of flowing water steplessly (analog control) by the flowing water amount adjusting plate 21, the turbine efficiency can always be kept to the maximum under any condition of the flowing water amount, and the turbulent flow and vortex of the partition part Does not occur.

Further, when this embodiment is compared with the conventional nozzle flow channel width changing method, the partition plate guide does not cause an excessive or unstable driving force due to the imbalance of water pressure between the inflow side and the closed side. There is no stirring of running water by the stay.

[0024]

As described above, according to the present invention, the turbine efficiency can be always kept at the maximum, the water pressure on the inflow side and the closed side can be well balanced, the driving force can be stabilized, and the efficiency can be improved. Therefore, effects such as improvement of product performance and reliability can be achieved.

[Brief description of drawings]

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

FIG. 2 is a side sectional view of FIG.

FIG. 3 is a front sectional view showing an example of a conventional cross-flow turbine.

FIG. 4 is a side sectional view of FIG.

FIG. 5 is a front sectional view showing another example of a conventional crossflow turbine.

FIG. 6 is a side sectional view of FIG.

[Explanation of symbols]

 1 Inlet pipe 2 Nozzle 3 Runner 6 Flow rate control device 20 Turbine cover 21 Flow rate control plate 22 Groove 24 Flow guide plate 25 Drive lever

Claims (1)

Claim: What is claimed is: 1. A cross-flow turbine, wherein a runner is installed at a tip nozzle portion of an inlet pipe through which driving water is circulated so as to intersect a water flow direction and an axial center, and the nozzle portion of the inlet pipe is provided. In the one provided with a water flow rate adjusting device for controlling the water supply to the runner, as the water flow rate adjusting device, an arcuate groove having a shape along a part of the outer circumference of the runner is formed in the side surface portion of the inlet pipe. In addition, a curved plate-like flow rate adjusting plate that covers the outer peripheral side of the runner from the outside through the groove is provided slidably through the runner along the axial direction of the runner. A flowing water guide plate for partitioning the flow path in the inlet pipe in the axial direction of the runner is integrally provided at the insertion end of the amount adjusting plate into the inlet pipe, and the flowing water amount is provided by a driving device provided outside the inlet pipe. Attach the adjusting plate and the flow guide plate to the shaft of the runner. A cross-flow turbine, wherein the flow passage width in the inlet pipe can be adjusted by continuously moving back and forth along the direction.