JPH0147101B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention is a new proposal regarding the joint portion of the jacket, which is an essential component of a cylindrical water turbine generator.

[Conventional technology]

As shown in FIG. 1, the cylindrical water turbine generator includes a generator 3a coupled to a water turbine 2a with exposed runner vanes 1, outer sheaths 2 and 3 that cover the outer peripheries of the water turbine 2a and the generator 3a, and The structure is such that water flows from the direction of the arrow as a flow channel through an annular chamber formed between a nose cone 4 provided on the upstream side of the machine and the wall of a water channel 5 made of concrete or the like, thereby generating electricity.

This cylindrical water turbine generator has the advantage of high water turbine efficiency at low heads, so it is mainly applied to waterways with heads of about 4 m to 15 m.

Since this cylindrical water turbine generator is installed in the waterway 5 as described above, it is covered with a plurality of divided outer covers such as the water turbine outer cover 2, the generator outer cover 3, and the nose cone 4. It has a streamlined shape, and each of the outer covers is integrally and watertightly joined using a joining means using a flange or the like.

However, since the cylindrical water turbine generator is constructed within the waterway 5, if the joint of the outer sheath mentioned above is weak, water may leak from there into the interior of the generator 3a, etc., and the generator This may cause insulation deterioration in the electric coils, cores, etc. of the rotor and stator of 3a, and may cause rust to occur in the bearings and other areas, which may result in failures that will prevent the generator from continuing to operate. There is. Therefore, it has conventionally been necessary to provide this joint with a highly reliable joining means. One method for this joining means is to form joining flanges 6, 6' inward of the outer jackets 2, 3, as shown in FIG. 2, which is an enlarged view of part A in FIG. Two rows of grooves 7, 7' are formed in the circumferential direction on the joint surface of the one flange 6, and packing is inserted into the grooves 7, 7', and another groove is formed between the packing grooves 7, 7'. There is a structure that provides 8.

A hole 9 passing through the outside of the flange 6 is provided in the other groove 8 described above, and this hole 9 is used to prevent water from leaking from the joint of the outer jacket through the packing groove 7. In this case, the water is guided into another groove 8 and leaked from the hole 9, and based on this fact, the leakage is detected and the water leakage is stopped by, for example, operating the pump 10 that injects a waterproof sealant. .

However, in this type of conventional configuration, even if water leakage is detected and a waterproof sealant is injected, the following problems still exist.

That is, when injecting a waterproof sealant, even if two holes 9 are provided, the waterproof sealant may not evenly fill the entire circumference of the groove 8 . This is the third
This will be explained with a diagram.

Two holes 9a and 9b are provided, and a pump is connected to detect water leakage based on the water coming out from the other hole with one hole closed, and temporarily inject a waterproof sealant into hole 9a. When the other hole 9b is opened and the waterproof sealant is injected at a pressure higher than the water leakage pressure, it flows in both directions of the groove 8 provided on the joint surface toward the other hole 9b, dividing as shown by the arrows. , it finally comes out from the other hole 9b. However, since the waterproof sealant flows in both directions of the groove 8, the flow velocity of each waterproof sealant is not necessarily equal, so simply checking the waterproof sealant coming out from the hole 9b will not work. Injection is performed only in one groove (for example, the upper side of the figure), and a portion of the groove (for example, the lower side of the figure) remains unfilled with the waterproof sealant.

Even if this temporarily stops the water leakage, the fact that there are parts of the grooves that are not filled with waterproof sealant as mentioned above means that if the packing breaks in that part next time. , holes 9a, 9b
Since both are blocked, it becomes impossible to detect water leakage, and in this state, if the packing in the packing groove 7', which is provided further inside the groove 8, is damaged, water will start to leak inside the aircraft. You will finally realize it.

[Means to solve the problem]

The present invention was developed with the aim of solving the problem of the conventional structure lacking in reliability by adding a simple structure to a highly reliable structure, and was discovered as a means to solve the problem. Three or more holes 9 penetrating from the groove into the inside of the outer cover are bored around the entire circumference of the detection groove 8, and usually all but one hole is closed. Furthermore, the detection groove 8 and the hole 9 penetrating from the detection groove to the inside of the outer cover are used to seal the waterproof seal when water leaks and it becomes necessary to inject waterproof sealant into the detection groove 8. The size is such that the agent can be easily circulated by the pressure of the pump.

〔Example〕

The present invention will be explained below based on Examples.

FIG. 4 shows an embodiment of the present invention.

Note that parts that are the same as those in the conventional model are given the same reference numerals, and therefore their explanations will be omitted.

Three holes 9a, 9b, and 9c, which penetrated from the detection groove 8 through the flange 6 and opened to the outer cover, were drilled around the entire circumference. When detecting water leakage, a detection device is provided only in hole 9c, and the other holes 9a and 9b are sealed. When water leakage is detected and it becomes necessary to inject a waterproof sealant, the pump 10 is connected to either one of the holes 9a or 9c, temporarily 9a, and the waterproof sealant is injected. At this time, the other holes 9b and 9c are opened. Then, the waterproof sealant flows along the detection groove 8 to the left or right as indicated by the arrow, and flows out from either the hole 9b or 9c. When it flows out, plug the hole 9a where the injection is performed. And the leaked hole 9b (the hole 9 that leaked earlier)
(assumed to be b), the waterproof sealant is injected again using the pump 10. Then, since flow resistance acts on the groove 8 on the side already filled with the waterproof sealant, the waterproof sealant flows out from the hole 9c. Similarly, if the hole 9c is closed with a plug, the plug of the hole 9a is removed, and the waterproof sealant is injected from the hole 9c with a pump, it will start flowing out from the hole 9a, and by continuing to inject it for a while, the entire circumference of the detection groove 8 will be filled. This means that the area is evenly filled with the waterproof sealant. The fact that the entire circumference of the detection groove 8 is filled with the waterproof sealant can be reliably confirmed by using the three holes 9a, 9b, and 9c.

In the embodiment of the present invention, the detection groove 8 and the packing grooves 7, 7' are both formed on the joint surface of one flange 6. Even if ' is formed separately on one joint surface and the other joint surface, the same effect can be achieved in the present invention. Furthermore, it goes without saying that the same applies even if the formation positions of the detection groove 8 and the packing groove 7 are exchanged or the other packing groove 7' is doubled.

〔Effect of the invention〕

As explained above, the present invention only requires the addition of a relatively simple configuration of providing three or more holes.
It is an excellent device that can completely detect water leaks and evenly inject waterproof sealant, and can greatly improve the reliability of cylindrical water turbine generators placed in this type of waterway.

[Brief explanation of drawings]

Fig. 1 is a partial vertical sectional side view showing the entire cylindrical water turbine generator, Fig. 2 is an enlarged side sectional view showing the joint provided in enclosure A in Fig. 1, and Fig. 3 is a side sectional view showing the entire cylindrical water turbine generator. FIG. 1 is an exploded view taken along line B--B showing a joint having a defect, and FIG. 4 is an exploded view of a joint showing an embodiment of the present invention. 1...Runner vane, 2...Water wheel outer cover, 2a...
...Water wheel, 3... Generator jacket, 3a... Generator, 4
... Nose cone, 5 ... Water channel, 6, 6' ... Flange-like joint, 7, 7' ... Packing groove, 8
...Detection groove, 9, 9a, 9b, 9c...hole.

Claims (1)

[Scope of Claims] 1. A cylindrical water turbine generator comprising a water turbine jacket 2, a generator jacket 3, and a nose cone 4, the water turbine jacket 2, the generator jacket 3, and the nose cone 4. Each of the cones 4 has a joint flange 6, 6' that protrudes inwardly at the joint part, and at least one flange 6, 6' in each joint part is concentric with the joint surface. grooves 7, 7' and a detection groove 8 are formed in the shape of a shape, and a hole 9 is formed, and the hole 9 is a communication hole communicating with the detection groove 8 at one end and the inside of the outer cover. Three or more grooves are formed around the detection groove 8 to detect water leakage and inject a waterproof seal.
is for storing a packing, and the water turbine outer cover 2, the generator outer cover 3, and the nose cone 4 are arranged in packings with flanges 6, 6' disposed in grooves 7, 7' at the joint parts. A cylindrical water turbine generator that is watertightly connected via a cylindrical turbine generator. 2. A cylindrical water turbine generator characterized in that all but one of the holes 9 penetrating from the detection groove 8 to the inside of the jacket according to claim 1 are closed. 3. A cylindrical water turbine generator according to claim 1, wherein the detection groove 8 and the hole 9 penetrating from the detection groove into the interior of the outer jacket are formed to have a size that allows a waterproof sealant to flow therethrough.