JPS6346698Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a water supply/sprinkling device for a double-hung type cross-flow water turbine, and is designed to cool the heat generating part when only one side of the cross-flow water turbine is operated.

As a type of cross-flow water turbine, there is one called a double cross-flow water turbine, in which a rotating machine such as a generator is connected between two cross-flow water turbines via their respective rotating shafts. In this double-hung type cross-flow turbine according to the conventional technology,
If water is not flowing on one side, the cross-flow turbine on the stopped side will generate wind damage (so-called Joule heat), and since water cannot enter the shaft penetration part, this part will generate heat. Although the amount of heat is small in terms of the capacity of the cross-flow turbine, it generates heat in the runner and locally heats the shaft penetrating portion, causing problems such as shaft bending or seal seizure.

In view of the above-mentioned conventional technology, the present invention aims to provide a water supply/sprinkling device for a double-hung type cross-flow water turbine, which is capable of cooling the heat generating part when only one side of the cross-flow water turbine is operated. . The present invention, which achieves this object, connects the inlet pipe of one cross-flow turbine and the shaft penetrating portion of the other cross-flow turbine, supplies part of the water from the inlet pipe to the shaft penetrating portion, and supplies the water of the inlet pipe to the shaft penetrating portion. A water supply pipe designed to cool the seal and the side wall of the runner, and a drainage pipe that drains the water supplied to the shaft penetration part and discharges water into the runner through a nozzle at the tip in an oblique direction to the rotational direction of the runner. It is characterized by having a tube.

Embodiments of the present invention will be described in detail below with reference to the drawings. As shown in Figure 1, a double-hung cross-flow turbine consists of two cross-flow turbines 1,
2, which rotates when supplied with water from inlet pipes 3 and 4, and rotates a generator 5 disposed between both cross-flow water turbines 1 and 2. Therefore, the rotating shafts 1a and 2a of both the cross-flow water turbines 1 and 2 are connected to the rotating shaft 5a of the generator 5 via shaft couplings 6 and 7. The water supply pipe 8 with a valve 9 interposed in the middle communicates the inlet pipe 4 of one cross-flow turbine 2 with the shaft penetration parts 12, 12a of the other cross-flow turbine 1, and when the valve 9 is opened, the shaft penetration part 8, 8a are supplied with a portion of the water from the inlet pipe 4 to cool the seals and runners. On the other hand, there is a valve 1 on the way.
The water supply pipe 10 in which the water supply pipe 1 is inserted communicates the inlet pipe 3 of the other cross-flow turbine 1 with the shaft penetration parts 13, 13a of one cross-flow turbine 2, and when the valve 11 is opened, the shaft penetration parts 13, 13a are connected to each other. A portion of the water in the inlet pipe 3 is supplied to the inlet pipe 3 to cool the seal and runner.

FIGS. 2a and 2b are a vertical cross-sectional view and a right side view thereof, which extract and show the shaft penetrating portion 12 of the cross-flow water turbines 1 and 2. FIG. As shown in both figures, a ring-shaped gland packing 14 and a ring-shaped inner small lid 15 are fitted to the rotating shaft 1a to seal the space between the rotary shaft 1a and the bracket 1b. A seal portion is formed by pressing inward in the direction. At this time, a ring-shaped annular water passage 15 a is formed on the inner periphery of the inner small lid 15 and opens into the water supply pipe 10 . At this time, a drain pipe 17 is also communicated with the annular water passage 15a. This configuration is the same for the other shaft penetrating portions 12a, 13, and 13a.

Thus, when water is flowing to the cross-flow turbine 2 and water is not flowing to the cross-flow turbine 1, part of the water in the inlet pipe 4 passes through the water supply pipe 8 to the shaft penetrating portions 12, 12a by opening the valve 9. Supplied annular water passage 15a
At this time, a small amount of leaked water enters the gland packing 14 side of the annular water passage 15a for lubrication and cooling, and water also flows on the opposite side (in the direction of the arrow in the figure). This leaks out and hits the side wall of the runner, and since the runner is rotating at this time, it is scattered and cools the entire side wall and surrounding area.

Further, as shown in FIG. 3, the drain pipe 17 is configured to discharge water into the runner 19 obliquely in the direction of rotation of the runner 19 through a nozzle 18 at its tip. Thus, the water discharged from the annular water passage 15a is injected obliquely in the circumferential direction of the runner 19 through the nozzle 18, as shown by the arrows in FIG. When injected in this manner, water once enters the runner 19 and is discharged from the outer periphery of the runner 19, so that it is scattered all around the runner 19 and is discharged from the suction pipe 20. That is, in the cross-flow turbine 1 on the side where water is not flowing, the inlet pipe 4, the water supply pipe 8, and the shaft penetration parts 12, 12 of the cross-flow turbine 2 on the side where water is flowing.
a. Water is injected into the runner 19 through the drain pipe 17, enters the runner 19 once, and is dissipated from the entire circumference. In addition, in FIG. 3, 21 is a guide vane, 22
is a casing, and 23 is a cover.

As specifically explained above in conjunction with the embodiments, the present invention provides the following effects.

(b) One side of the double-hung cross-flow turbine can be selected and operated at any time.

(b) Cooling water also contributes to the generation of rotational force, albeit in a small amount, and energy can be recovered.

C. Even if both cross-flow turbines are operated, they can be operated without any problem and the internal flow will not be obstructed.

D. The cooling water is distributed all over the outer circumference of the side wall of the runner, providing a uniform cooling effect, so the amount of water is small, and in the unlikely event that water leaks from these cooling parts (excluding pipes). Since these are all devices inside the crossflow turbine, there is no chance of external water leakage.

E. High reliability as there are no moving parts such as opening and closing the water.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram conceptually showing an embodiment of the present invention, Fig. 2 a is a vertical sectional view extracting and showing the shaft penetration part, Fig. 2 b is a right side view thereof, and Fig. 3 is a cross section. FIG. 2 is a cross-sectional view showing a flow turbine. In the drawing, 1 and 2 are cross flow turbines, 3 and 4 are inlet pipes, 5 is a generator, 8 and 10 are water supply pipes, 12,
12a, 13, 13a are shaft penetration parts, 17 is a drain pipe, 18 is a nozzle, and 19 is a runner.

Claims (1)

[Scope of utility model registration request] In a double-hung type cross-flow turbine in which a rotating machine such as a generator is connected between two cross-flow turbines via their respective rotating shafts, the inlet pipe of one cross-flow turbine is connected to the inlet pipe of the other cross-flow turbine. A water supply pipe that communicates with the shaft penetration part of the cross-flow turbine and supplies part of the water from the inlet pipe to the shaft penetration part to cool the seal of the shaft penetration part and the side wall of the runner, and the shaft penetration part. A double-hung type cross-flow water turbine characterized by having a drain pipe for discharging water supplied to the runner and discharging water into the runner through a nozzle at the tip in an oblique direction in the rotational direction of the runner.
Water sprinkler.