JPS59147877A - Cross flow water turbine - Google Patents

Abstract

PURPOSE:To improve efficiency while to reduce noise and to prevent cavitation by making an air feed port at the leading edge of water guide member while coupling an air lead valve to said air feed port. CONSTITUTION:An air chamber 11 is provided on the upper face of water guide member 7 then an exhaust hose 13 coupled with an air lead valve is coupled to the feed port 12 of air chamber 11 while an air feed port 14 is made at the upstream side of bent section 10 of water guide member 7. When the inner pressure of cross flow turbine drops excessively, air taken from outside is fed to the gap between water guide member 7 and runner 5 thereby water conventionally passed through said gap (t) will flow into the runner 5 to improve rotary efficiency of runner 5 while to eliminate pulsing of water thus to reduce noise and to prevent cavitation through pressure adjusting due to air.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cross-flow water turbine that has low noise, high efficiency, and does not cause VC cavitation.

In a cross-flow water turbine, the air inside the water turbine is sucked out by the force of the discharged water, creating a negative pressure inside the water turbine. Negative pressure inside the turbine is effective because it promotes the suction of water into the inlet pipe ρλ, but if this pressure becomes extremely large, the water level in the discharge pipe rises and the runner is submerged in water. There is a risk that the product will become warped and the efficiency will drop significantly. Therefore, in the past, as shown in Fig. 1, the cover 1K and the wall 9f2
is provided, and when the negative pressure falls below a certain standard, the valve automatically opens to replenish outside air and maintain the pressure inside the water turbine 3 constant.

By the way, in the cross-flow turbine 3, the water flowing from the inlet pipe 4 flows into the runner 5.
The water guiding member 7 is connected to the runner 5 from the inside of the casing 6.
However, the water that passes along the flow of water through the space between this water guide part 7 and the runner 5 does not enter the runner 5, and passes through point 1 of -f:. In addition, each time the blade 8 of the runner 5 passes at the tip of the water guide member 7, the water pressure in the gap between the runner 5 and the water guide member 7 temporarily increases, causing water loss. The pulsating noise caused by the pulsating noise caused the following motion and fusion.In addition, the air intake valve 2 maintains the pressure inside the water turbine 3 at approximately one foot, but water enters the runner 5 and comes out. The flow of going
Due to the flow rate of the water and the shape of the blade 8, when water flows along the blade 8, there are places where the pressure decreases between the blade 8 and cavitation occurs. Problems occurred frequently.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a cross-flow water turbine that eliminates the above-mentioned drawbacks of the ridges, has a high efficiency with less occurrence of cavitation, and can prevent the occurrence of cavitation.

The formulation of the present invention to achieve the purpose of the invention is to provide an air supply port 2 at the tip of the water bundle FE3 member that guides water into the runner of the cross-flow turbine to send air to the runner side.
A part drilled along the axis of the runner is in contact with an air inlet valve for introducing external air according to the internal pressure of the cross-flow water turbine and the air supply port. Embodiment 2 of a cross-flow water turbine according to the present invention will be described in detail based on the drawings, but only the key points of the invention will be explained. As shown in FIG. 2, the tip of the water guide member 7 has a curved portion 10 that approaches the runner 5 with a slight gap of 1 J), but on its upper surface there is a curved portion 10 parallel to the axis of the runner 50. A long and narrow air chamber 11 is provided in the air supply port 12 provided in the entire air chamber 11.
The exhaust hose 13 connected to the C air intake and 7F-2 is connected. Furthermore, a runner 5 is installed on the upstream side of the curved portion lO.
An air supply port (air supply port) 14 is bored along all the air chambers 11 to communicate between the gap m1 and the inside of the air chamber 11.

Therefore, when the water turbine 3 is in operation, when the negative pressure in the TFC f section falls below a certain standard, the air intake valve 2 opens and at the same time all the members 1
Sucked out from 4. Thereafter, all of the water flows into the gap between the water guide member 7 and the runner 5 and is partially sucked into the runner 5. As a result of step 7, the water that had been following the gap tJ ratio in the gap 1 is forced to flow into the runner 5, and the water system no longer flows, and the amount of water that hits the blade 84/c increases.

It should be noted that if the air 'Kl 4 is provided near the tip of the downstream side of the curved portion 10, it will be difficult to achieve the above-mentioned effect, so it is preferable to provide it on the upstream side of the curved portion 10 as described above. . As shown in Fig. 13 of the reeds, it is better to install the Zenki 14 in a direction slightly along the direction of the flow, and if it is made into a long groove without a person, the air can be sent evenly. -i9, the effect Lri increases.

In addition, as shown in FIG. 4, the direct nitrogen introduction 12
A structure with IK connection is also conceivable.

As explained above, in the present invention, when the internal pressure of the cross-flow turbine falls too low, the air taken in from the outside is sent to the gap between the water guide member and the runner, so that the air can be easily traced through this gap. The rotational efficiency of the Q runner is increased as the water that was previously flowing into the runner is flowed into the runner, and the pulsation of water in this area is eliminated, reducing noise.

Furthermore, the cavitation that was occurring in the blade can be prevented by adjusting the pressure by the air supplied from the force near the effective rib where the cavitation was occurring.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional structural diagram of a conventional cross-flow water turbine, Fig. 2 is a sectional structural diagram of a main part showing an example of the present invention, and Fig. 3 is a cross-sectional structural diagram of a main part showing another embodiment. 4 are cross-sectional structural views showing still another embodiment.
In Figure 1, 2 is an air introduction valve, 3 is a cross-flow turbine, 5 is a runner, 7 is a water guide, and 14 is an air supply port. Applicant: Mr. Akira, Mr. Taishiro, Mr. Shishibu, Former Mr. Ishibu (and 1 other person) Figure 4-4

Claims (1)

[Claims] Water guide S that guides water sound into the runner of a crossflow water turbine
An air supply port is installed at the tip of the material along the axis of the runner to send air to the runner side.
(e) A cross-flow water turbine characterized by connecting the air supply port to an air introduction valve that takes in outside air according to the internal pressure of the self-regulating low water turbine.