JP4286824B2 - Water stop device and generator unit inspection method using the water stop device - Google Patents

Description

  The present invention relates to a water stop device attached to a hydraulic iron pipe provided in a generator unit of a hydroelectric power plant, and more particularly to a water stop device used for inspection and maintenance.

  In hydroelectric power stations, for the purpose of maintaining the functions of the generator unit and preventive maintenance, the parts are disassembled in units of generator units, and a thorough inspection is performed to replace consumable parts and defective parts in advance before failure occurs. It takes about 2 months for every 15 years. In addition, during the detailed inspection of the generator unit, the inlet valve installed on the upstream side of the generator unit is also subject to inspection, and the inspection of this inlet valve requires about two months for desorption work and inspection. .

  For example, when the generator unit is connected to the downstream side of two hydraulic iron pipes branched from one hydraulic iron pipe, the inlet valve during the close inspection period of one generator unit is a water stop function. Therefore, if water is caused to flow through the iron pipe channel so as to operate the other generator unit, a large amount of water leaks from the one generator unit. This causes water resources to disappear and the surrounding environment to deteriorate due to water leakage. Therefore, in order to prevent water leakage, the inside of the iron pipe water channel must be shut off, and water cannot be supplied to the other generator unit. Therefore, the other generator unit is also stopped, and one generator unit is inspected. The other generator unit was in operation waiting for the end.

In the above-described detailed inspection of the generator unit at the hydroelectric power station, the method of stopping the generator unit that is not subject to inspection capable of generating power has a problem in that the operating rate of the generator unit decreases.
In addition, if multiple generator units are stopped at the same time in one river system, the effects of changes in dam water storage and transmission line tide due to the generator unit stoppage are significant, and adjustment and transmission of dam water storage It was difficult to adjust the power flow and required a lot of labor.

  Accordingly, the present invention has been made in view of the above problems, and when inspecting and servicing a generator unit of a hydroelectric power plant, water attached to a hydraulic iron pipe and flowing into the generator unit is stopped. And it aims at providing the water stop apparatus which enables operation of the generator unit which is not an inspection object.

The water stop device of the present invention that solves the above problems is used when inspecting a generator unit in a hydroelectric power plant that includes a plurality of generator units and is provided with an inlet valve in a water intake section of each generator unit. A water stopping device for stopping water flowing into the generator unit, detachably attached to a hydraulic iron pipe for supplying water to the generator unit, and a closing member for stopping the flow of water; A support member that is detachably attached to the generator unit; and a connection member that connects the closure member and the support member. The connection member has a cylindrical shape, and one end is connected to the support member. An outer cylinder having a cylindrical shape, one end connected to the closing member, and the other end slidably inserted into the outer cylinder, and the inner cylinder slidable relative to the outer cylinder. Sliding mechanism for moving the sliding mechanism And a locking mechanism for restraining the sliding, the axial length of the connecting member is characterized by a variable by adjusting the sliding mechanism (the first invention).

  According to the present invention, a closure member that is detachably attached to a hydraulic iron pipe for supplying water to the generator unit, stops the flow of water, a support member that is detachably attached to the generator unit, and a closure member By providing a connecting member that connects the support member and the support member, it is possible to reliably stop water flowing from the hydraulic iron pipe to the generator unit. Therefore, in the case where a plurality of generator units are installed on the downstream side of one hydraulic iron pipe, it is possible to stop only the generator unit to be inspected and operate the generator unit not to be inspected. The operating rate of the generator unit is improved.

Further, since the support member is connected to the generator unit, it acts on the closing member when water flows into the hydraulic iron pipe, and is a reaction force material against the water pressure transmitted to the support member via the connecting member. Acts as Therefore, in order to operate a generator unit that is not subject to inspection, even if a large amount of water is flowed into the hydraulic iron pipe, the possibility of falling off is lower than when the water is stopped with only the closing member, and It is possible to safely attach the water stop device to the hydraulic iron pipe.
Further, the connecting member includes an outer cylinder connected to the support member, an inner cylinder connected at one end to the closing member, the other end closed and slidably inserted into the outer cylinder, and the inner cylinder connected to the outer cylinder. A sliding mechanism for sliding against the outer cylinder, and a lock mechanism for stopping the sliding mechanism. By adjusting the sliding mechanism, the inner cylinder slides relative to the outer cylinder. Since it can move and the length of a connection member can be changed, it can be applied to many generator units.
Further, since the length of the water stop device is fixed by the lock mechanism, the distance between the closing member and the support member can be accurately maintained for a long period of time.

According to a second invention, in the first invention, the closing member has bolt holes on a plurality of circumferences that are concentric with the hydraulic iron pipe and have different diameters.
According to the present invention, since the closing member has bolt holes on a plurality of circumferences having different diameters, the closing member can be attached to hydraulic iron pipes having different diameters. Therefore, it can be applied to many generator units.

According to a third aspect, in the first aspect, the support member has bolt insertion holes on a plurality of circumferences that are concentric with the intake section of the generator unit and have different diameters.
According to the present invention, since the support member has bolt insertion holes on a plurality of circumferences having different diameters, the support member can be attached to the water intake portion of the generator unit having different diameters. Therefore, it can be applied to many generator units.

According to a fourth aspect of the present invention, there is provided a method for inspecting a generator unit comprising: a plurality of generator units, wherein the generator unit is inspected at a hydroelectric power plant provided with an inlet valve at a water intake portion of each generator unit ; In the method of using the water stop device, the water stop device is detachably attached to a hydraulic iron pipe for supplying water to the generator unit, and a closure member for stopping the flow of water and the detachable member to the generator unit. A support member to be attached; and a connecting member that connects the closing member and the support member. The connecting member has a cylindrical shape, and an outer cylinder having one end connected to the supporting member, and a cylindrical shape. An inner cylinder having one end connected to the closing member and the other end slidably inserted into the outer cylinder; and a sliding mechanism for sliding the inner cylinder relative to the outer cylinder; , For stopping sliding of the sliding mechanism The length of the connecting member in the axial direction is variable by adjusting the sliding mechanism, and the length of the water stop device feeds water to the generator unit to be inspected. The axial length of the connecting member is adjusted so that the distance between the mounting surface of the hydraulic iron pipe and the mounting surface of the power generation unit to be inspected is the same, and water is supplied to the generator unit to be inspected. Attach the closing member to the hydraulic iron pipe to be attached and attach the support member to the generator unit to be inspected, stop the flow of water to the generator unit, and continue water supply to the generator unit not to be inspected The generator unit to be inspected is inspected, and the generator unit not to be inspected continues to generate power.
According to the present invention, a water stop device is attached between the hydraulic iron pipe for feeding water to the generator unit to be inspected and the intake section of the generator unit, and the flow of water to the generator unit is stopped. Continue to supply water to non-inspected generator units, inspect generator units that are not inspected, and improve generator unit availability so that non-inspected generator units continue to generate electricity. It is possible.

  The water stop device according to the present invention stops water flowing into the generator unit attached to the hydraulic iron pipe when inspecting and maintaining the generator unit of the hydroelectric power station, and Enable operation.

  Further, the water stop device can be applied to many generator units because the closing member and the support member can be attached to hydraulic iron pipes and generator units having different diameters and the length is variable. Therefore, it is not necessary to manufacture the water stop device for each generator unit, and the cost can be reduced.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a plan view showing a state in which a water stop device according to a first embodiment of the present invention is attached to a generator unit. As shown in FIG. 1, for convenience of explanation, in the present embodiment, for example, they are connected to the downstream sides of two hydraulic iron pipes 2 branched from one hydraulic iron pipe 1 via inlet valves 6, respectively. A method of inspecting and maintaining only the generator unit 3 by attaching the water stop device 5 to the generator unit 3 among the generator units 3 and 4 will be described. Here, the diameters of the two hydraulic iron pipes 2 are different from each other.

  FIG. 2 is a cross-sectional view showing only the part above the center line 11 of the water stop device 5 in a state where the water stop device 5 according to the present embodiment is attached between the generator unit 3 and the hydraulic iron pipe 2. As shown in FIG. 2, the water stop device 5 is detachably attached to the hydraulic iron pipe 2, and a closing member 7 for stopping the flow of water and a support detachably attached to the water intake portion of the generator unit 3. A member 8 and a connecting member 9 that connects the closing member 7 and the supporting member 8 are provided.

  The closing member 7 has a disk shape so as to stop flowing water from the hydraulic iron pipe 2 to the generator unit 3 and to be connected to the flange 10 at the end of the hydraulic iron pipe 2. The closing member 7 is provided with bolt holes 13a and 13b on two circumferences that are concentric with the center line 11 of the hydraulic iron pipe 2 and have different diameters. In addition, seal members 14 for improving water-stopping properties are provided around the circumferences of the circles, respectively.

  The support member 8 has a donut shape so as to be connected to the flange 15 of the water intake portion of the generator unit 3. And in the support member 8, the generator unit mounting insertion holes 18a, 18b, 18c for inserting the water stop device mounting bolts 29 are concentric with the center line 11 of the water intake portion of the generator unit 3 and have different diameters. Are provided on three circumferences. Further, the support member 8 is provided with an inner cylinder adjusting insertion hole 22 for inserting the sliding bolt 25 on a concentric circle of the center line 11 of the connecting member 9.

  In this embodiment, the closure member 7 has bolt holes 13a and 13b on two circumferences having different diameters, and the support member 8 has a generator unit attached on three circumferences having different diameters. Although the insertion holes 18a, 18b, and 18c are provided, the present invention is not limited thereto. For example, the bolt holes 13 and the generator unit mounting insertion holes 18 are provided on four or more circumferences having different diameters. Also good.

  The connecting member 9 has a cylindrical outer cylinder 19 whose one end (right end in the figure) is welded to the support member 8, and one end (left end in the figure) is connected to the closing member 7 so that it can slide in the outer cylinder 19. The inserted cylindrical inner cylinder 20, a sliding mechanism 21 for sliding the inner cylinder 20 with respect to the outer cylinder 19, and a lock mechanism 34 for stopping the sliding of the sliding mechanism 21. Prepare.

  The inner cylinder 20 has flanges 23a, 23b projecting inward from the inner peripheral surface at both ends of the inner cylinder 20, and insertion holes 24a, 24b for inserting bolts into the flanges 23a, 23b. And have. The inner cylinder 20 is press-fitted and fixed to the closing member 7 by screwing the bolt 12 into the closing member 7 through an insertion hole 24 a provided in the flange 23 a on one end side of the inner cylinder 20.

  The sliding mechanism 21 sandwiches a sliding bolt 25 inserted into an insertion hole 24 b provided in the flange 23 b of the inner cylinder 20 and an inner cylinder adjustment insertion hole 22 of the support member 8, and the flange 23 b of the inner cylinder 20. The inner cylinder 20 slides in the outer cylinder 19 by rotating the sliding bolt 25. The inner cylinder fixing nuts 26a and 26b are screwed into the sliding bolt 25.

  The lock mechanism 34 includes a support member fixing nut 27 that is screwed to the sliding bolt 25. By tightening the support member fixing nut 27, the rotation of the sliding bolt 25 is prevented, and the sliding mechanism 21 is Prevent sliding. By fixing the sliding mechanism 21, the distance between the closing member 7 and the supporting member 8 to which the end portions of the connecting members 9 are respectively connected is also fixed, and the length of the water stop device 5 is fixed.

  In the present embodiment, the sliding mechanism 21 has been described with respect to a method of sliding with a screw, and the locking mechanism 34 has been described with respect to a nut that prevents the rotation of the screw. However, the present invention is not limited to this. As long as the moving mechanism 21 is a mechanism for sliding the inner cylinder 20 with respect to the outer cylinder 19, other methods may be used. Further, the lock mechanism 34 is used to prevent the inner cylinder 20 from sliding. Any other method may be used.

  The inner cylinder 20 slides in the outer cylinder 19 by loosening the support member fixing nut 27 and rotating the sliding bolt 25. As the inner cylinder 20 slides in the outer cylinder 19, the length of the connecting member 9 changes, and at the same time, the distance between the closing member 7 and the supporting member 8 to which the end portions of the connecting member 9 are respectively connected also changes. The length of the water stop device 5 changes.

  In the present embodiment, for example, the axial centers of the hydraulic iron pipe 2, the intake portion of the generator unit 3, the outer cylinder 19, and the inner cylinder 20 are all concentric. However, the present invention is not limited to this. The axial centers of the iron pipe 2 and the outer cylinder 19 may be different.

  Next, the attachment method of the water stop apparatus 5 at the time of checking and maintaining the generator unit 3 will be described according to the attachment procedure. In this embodiment, the internal diameter of the intake part of the hydraulic iron pipe 2 and the generator unit 3 shall be 1300 mm, for example.

  First, the distance between the mounting surface of the hydraulic iron pipe 2 and the mounting surface of the water intake portion of the generator unit 3 is measured, and the length of the water stop device 5 is adjusted to be the same as this distance. In the present embodiment, the distance between the mounting surface of the hydraulic iron pipe 2 and the mounting surface of the water intake portion of the generator unit 3 is, for example, 680 mm. The length of the water stop device 5 can be adjusted by changing the length of the connecting member 9. As described above, the support member fixing nut 27 on the inner cylinder 20 side is loosened, and the sliding bolt 25 is attached. Adjust by rotating. Here, when the water stopping device 5 is lengthened, the sliding bolt 25 is rotated counterclockwise, and when the water stopping device 5 is shortened, the sliding bolt 25 is rotated clockwise. After adjusting the water stop device 5 to a desired length, the support member fixing nut 27 is tightened to fix the length of the water stop device 5.

  Next, the water stopping device 5 is lifted by a crane or the like using the suspension bolts 28 provided on the outer peripheral portion of the closing member 7 and is moved between the hydraulic iron pipe 2 and the generator unit 3. The water stop device mounting bolt 29 is inserted into the through hole 30 provided in the flange 10 of the hydraulic iron pipe 2 and screwed into the bolt hole 13a provided in the closing member 7 in order to attach the hydraulic iron pipe 2 having an inner diameter of 1300 mm. The hydraulic iron pipe 2 and the closing member 7 are pressed and fixed.

  Finally, in order to attach the water stop device mounting bolt 29 to the intake portion of the generator unit 3 having an inner diameter of 1300 mm, the generator unit mounting insertion hole 18a provided in the support member 8 and the flange 15 of the intake portion of the generator unit 3 are provided. The flange 15 of the water intake portion of the generator unit 3 and the support member 8 are press-fitted and fixed by being inserted into the through-hole 31 provided in the pipe and screwed into the nut 32.

The water stop device 5 attached between the hydraulic iron pipe 2 and the generator unit 3 stops water flowing into the generator unit 3 when the generator unit 3 of the hydroelectric power station is inspected and maintained.
When inspecting and maintaining the generator unit 3, a water stop device 5 is attached between the hydraulic iron pipe 2 and the generator unit 3 to stop water flowing into the generator unit 3 and to the generator unit 4. Sends water and operates the generator unit 4.

  Next, the case where the inspection and maintenance of the generator unit 3 described above is completed and the water stop device 5 is used for the other generator units 4 will be described.

  FIG. 3 is a plan view showing a state in which the water stop device 5 according to the present embodiment is attached to the generator unit 4. As shown in FIG. 3, when checking the generator unit 4 after checking the generator unit 3, the water stop device 5 attached to the generator unit 3 is removed and attached to the generator unit 4. The water flowing into the generator unit 4 is stopped and the water is supplied to the generator unit 3 to operate the generator unit 3.

  FIG. 4 is a cross-sectional view showing only the upper part from the center line 11 of the water stop device 5 in a state where the water stop device 5 according to this embodiment is attached between the hydraulic iron pipe 2 of the generator unit 4 and the generator unit 4. It is. As shown in FIG. 4, the generator unit 4 has a distance between the mounting surface of the hydraulic iron pipe 2 and the mounting surface of the water intake section of the generator unit 4, the diameter of the hydraulic iron pipe 2, and the diameter of the water intake section of the generator unit 4. In this embodiment, for example, the distance between the mounting surface of the hydraulic iron pipe 2 and the mounting surface of the water intake portion of the generator unit 4 is 500 mm, and the hydraulic iron pipe 2 and the generator unit 4 are different from the above-described generator unit 3. The inner diameter of the water intake section is 1000 mm.

  Since the length of the water stop device 5 is 680 mm when removed from the generator unit 3, first, the length of the water stop device 5 is shortened to 500 mm by rotating the sliding bolt 25 clockwise. The support member fixing nut 27 is tightened to fix the length of the water stop device 5.

  Next, the water stop device 5 is moved between the hydraulic iron pipe 2 and the generator unit 4, and the water stop device mounting bolt 29 is inserted into the through hole 30 provided in the flange 10 of the hydraulic iron pipe 2, and the inner diameter is 1000 mm. In order to attach the hydraulic iron pipe 2, the hydraulic iron pipe 2 and the closing member 7 are pressed and fixed by screwing into bolt holes 13 b provided in the closing member 7.

Finally, the generator unit mounting insertion hole 18b provided in the support member 8 for mounting the water stop device mounting bolt 29 to the water intake portion of the generator unit 4 having an inner diameter of 1000 mm, and the flange 15 of the water intake portion of the generator unit 4 The flange 15 of the water intake portion of the generator unit 4 and the support member 8 are press-fitted and fixed by being inserted into the through-hole 31 provided in the pipe and screwed into the nut 32.
The water stop device 5 attached between the hydraulic iron pipe 2 and the generator unit 4 stops water flowing into the generator unit when other generator units of the hydroelectric power station are inspected and maintained.

  By using the water stop device 5 described above, water that flows into the generator unit 3 or 4 when the generator unit 3 or 4 of the hydroelectric power station is inspected and maintained is stopped, and power generation that is not subject to inspection or maintenance is maintained. The machine unit 3 or 4 can be operated. Therefore, the operating rate of the generator units 3 and 4 is improved.

  Further, the water stop device 5 according to the present invention has a closure member 7 and a support member 8 that can be attached to the hydraulic iron pipe 2 and the generator unit 3 or 4 having different diameters, respectively, and the length thereof is variable. It can be applied to units. Therefore, it is not necessary to manufacture the water stop device 5 for each generator unit, and the cost can be reduced.

  In addition, although this embodiment demonstrated the case where the generator units 3 and 4 were each connected to the downstream of the two hydraulic iron pipes 2 branched from the one hydraulic iron pipe 1, it is limited to this. For example, when three or more branches from one hydraulic iron pipe 1, or a single water conduit, the water tank portion branches into a plurality of hydraulic iron pipes, and a generator unit is connected to each. Even if applicable.

It is a top view which shows the state which attached the water stop apparatus which concerns on 1st embodiment of this invention to the generator unit. It is sectional drawing which shows only the upper part from the centerline of the water stop apparatus of the state which attached the water stop apparatus which concerns on this embodiment between the hydraulic iron pipe of a generator unit, and a generator unit. It is a top view which shows the state which attached the water stop apparatus which concerns on this embodiment to the other generator unit. It is sectional drawing which shows only the upper part from the center line of the water stop apparatus of the state which attached the water stop apparatus which concerns on this embodiment between the hydraulic iron pipe of the other generator unit, and the generator unit.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1, 2 Hydraulic iron pipe 3, 4 Generator unit 5 Water stop apparatus 6 Inlet valve 7 Closure member 8 Support member 9 Connecting member 10 Flange 11 Centerline 12 Bolt 13a, 13b Bolt hole 14 Sealing material 15 Flange 18a, 18b, 18c Inlet Valve mounting insertion hole 19 Outer cylinder 20 Inner cylinder 21 Sliding mechanism 22 Inner cylinder adjusting insertion holes 23a, 23b Flange 24a, 24b Insertion hole 25 Sliding bolts 26a, 26b Inner cylinder fixing nut 27 Support member fixing nut 28 Suspension bolt 29 Water stop device mounting bolt 30, 31 Through hole 32 Nut 34 Lock mechanism

Claims (4)

Used to check the generator unit in a hydroelectric power plant that has a plurality of generator units and has an inlet valve in the intake section of each generator unit, to stop water flowing into the generator unit A water stop device,
A closing member for detachably attaching to a hydraulic iron pipe for supplying water to the generator unit, and for stopping the flow of water;
A support member detachably attached to the generator unit;
A connecting member for connecting the closing member and the support member ;
The connecting member is
An outer cylinder having a cylindrical shape and having one end connected to the support member;
An inner cylinder having a cylindrical shape, one end connected to the closing member and the other end slidably inserted into the outer cylinder;
A sliding mechanism for sliding the inner cylinder relative to the outer cylinder;
And a locking mechanism for restraining the sliding of the sliding mechanism, wherein the axial length of the connecting member is variable by adjusting the sliding mechanism .   The water stop device according to claim 1, wherein the closing member has bolt holes on a plurality of circumferences that are concentric with the hydraulic iron pipe and have different diameters. The water stop device according to claim 1, wherein the support member has bolt insertion holes on a plurality of circumferences that are concentric with the water intake portion of the generator unit and have different diameters. In a method for inspecting a generator unit in a hydroelectric power plant provided with a plurality of generator units and provided with an inlet valve in a water intake section of each generator unit using a water stop device
The water stop device is
A closing member for detachably attaching to a hydraulic iron pipe for supplying water to the generator unit, and for stopping the flow of water;
A support member detachably attached to the generator unit;
A connecting member for connecting the closing member and the support member;
The connecting member is
An outer cylinder having a cylindrical shape and having one end connected to the support member;
An inner cylinder having a cylindrical shape, one end connected to the closing member and the other end slidably inserted into the outer cylinder;
A sliding mechanism for sliding the inner cylinder relative to the outer cylinder;
A locking mechanism for restraining the sliding of the sliding mechanism, and the axial length of the connecting member is variable by adjusting the sliding mechanism,
The length of the water stop device is the same as the distance between the mounting surface of the hydraulic iron pipe that supplies water to the generator unit to be inspected and the mounting surface of the power generation unit to be inspected. Adjust the axial length,
Attaching the closing member to a hydraulic iron pipe that supplies water to the generator unit to be inspected and attaching the support member to the generator unit to be inspected to stop the flow of water to the generator unit ,
Continue water supply to generator units that are not subject to inspection,
A method of checking a power generation unit, wherein the generator unit to be inspected is inspected, and the generator unit not to be inspected continues power generation.

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