JP6469552B2 - Strainer device and method of using the same - Google Patents

Description

  The present invention is provided at a water intake of a water pipe (hydraulic iron pipe) in order to obtain, for example, a cooling water for a bearing of a generator or a turbine in a hydroelectric power plant and a cooling water for an air cooler for cooling a generator winding. The present invention relates to a strainer device and a method of using the strainer device for preventing foreign matter such as fallen leaves from clogging a boat-shaped strainer.

  In a hydroelectric power plant, water stored in a dam is guided to a water tank through a water conduit, and water in the water tank is guided to a water turbine through a water conduit, and power is generated by the generator. The water flow pipe is provided with a water intake, and the water intake is connected to a cooling water pipe, and the cooling water is supplied to a generator, a bearing portion of a water turbine, a cooler, and the like via an automatic strainer.

  A boat-shaped strainer is attached to the intake port so that impurities such as fallen leaves do not flow into the cooling water pipe from the intake port. However, the fall of deciduous trees increases from autumn to winter, and the fallen leaves are clogged by a large number of pores formed in the strainer, so that the amount of cooling water is drastically reduced and the cooling performance is significantly lowered. In this case, since there is a possibility that the generator suddenly breaks down, it is necessary to stop the operation of the generator in advance and stop the passage of water in the passage pipe to clean the strainer. It was necessary to spend time and effort. For this reason, various studies have been made to avoid such an abnormal situation.

  This type of strainer device is disclosed in Patent Document 1, for example. That is, this strainer device is attached to the tip of the intake pipe, and is fitted to the strainer main body provided with a plurality of openings that communicate with the intake pipe, and the outside of the strainer main body, and can be moved relative to the strainer main body. An opening degree adjusting member and an operating means for moving the opening degree adjusting member relative to each other. And the foreign substance adhering to a strainer can be removed by moving an opening degree adjustment member relatively with respect to a strainer main body, and changing the opening degree of the opening of a strainer main body repeatedly.

JP 2009-56407 A

  In the strainer device of the conventional configuration described in Patent Document 1 described above, the opening adjustment member must be mounted on the outer periphery of the strainer body so as to be relatively movable, and the opening adjustment member is attached to the opening of the strainer body. A number of combined holes must be formed. For this reason, the conventional strainer device has a complicated structure and is complicated to install.

  Furthermore, this strainer device has to move the opening adjusting member relative to the strainer many times by the operating means, and the operation is troublesome and when the opening of the strainer body is clogged with a large amount of impurities. There is a possibility that the operation of the opening adjustment member becomes heavy or the operation becomes difficult.

  Accordingly, an object of the present invention is to provide a strainer device that has a simple configuration and can maintain the function of the strainer over a long period of time, and a method for using the strainer device.

  In order to achieve the above object, a strainer device of the present invention is configured to take water from a water intake provided in a peripheral wall of a water flow pipe, and has a plurality of water intake holes in the water intake. The strainer is provided with a strainer for blocking impurities, and one end of the strainer is fixed to the strainer, and the other end is not fixed to the strainer and is swung by the flow of water to prevent clogging of the intake hole due to impurities. A plurality of swing members are provided.

It is preferable that the intake port is provided at a central position on the side portion of the water flow pipe, and a plurality of swing members are provided so as to extend in parallel with the flow of water in the lower half of the strainer.
The intake port is provided at the central position of the side of the water flow pipe, and a plurality of swing members are provided in the direction of water flow in the lower half of the strainer so that the swing members do not contact each other when swinging Preferably they are arranged.

It is preferable that the swing member is constituted by a chain.
One end of the chain is preferably fixed to a strainer, and a ring formed larger than the water intake hole is connected to the other end of the chain.

It is preferable that a coating film is formed on the outer surface of the strainer.
The water passage pipe is a hydraulic pipe of a hydroelectric power plant, and it is preferable that a cooling water pipe for cooling at least a bearing portion of the generator is connected to the intake port.

  When the strainer device is not used, the swinging member hangs down by its own weight. When the strainer device is used, the swinging member swings due to the water flowing through the water flow pipe and adheres to the strainer. It is characterized by removing.

  A plurality of the swinging members are provided so as to extend in parallel with the flow of water, and a plurality of swinging members are provided in the direction of the water flow, and each swinging member swings independently by the water flowing in the water flow pipe. It is preferable to remove foreign substances adhering to the strainer.

  According to the strainer device of the present invention, there is an effect that the configuration is simple and the function of the strainer can be maintained for a long time.

The front view which shows the strainer apparatus which attached the chain as a rocking | fluctuation member to the strainer outer surface in embodiment. The sectional side view which shows the strainer fixed to the water intake to the cooling water piping in water flow piping. The cross-sectional view which shows the strainer fixed to the water intake to the cooling water piping in water flow piping. The sectional side view which expands and shows the strainer apparatus which attached the chain to the strainer fixed to the water intake to the cooling water piping in water flow piping. The front view which shows the state which connected the ring larger than the water intake hole of a strainer to the free end of the chain. The action figure which shows the state which a chain rock | fluctuates with a water flow. The perspective view which shows the effect of embodiment by a strainer apparatus. Explanatory drawing which shows typically the whole structure in a hydroelectric power station.

Hereinafter, embodiments of the present invention will be described in detail with reference to FIGS.
As shown in FIG. 8, a water tank 12 is provided downstream of the dam 11, and water in the dam 11 is stored in the water tank 12 through a water conduit 13. A water passage pipe (hydraulic pressure pipe) 14 extending obliquely downward is connected to the water tank 12, and the water passage pipe 14 is connected to a water turbine 16 through a main valve 15. The water flow pipe 14 is made of steel and has a diameter of, for example, 2600 mm and a thickness of, for example, 28 mm. Then, the water in the water tank 12 reaches the water wheel 16 through the water passage pipe 14, and the water turbine 16 is turned by the force of the water flowing down the water passage pipe 14, and the generator 17 generates power. .

  As shown in FIG. 2, a water intake 18 is opened at a central position of one side of the peripheral wall 14a of the water flow pipe 14, and a cooling water pipe 19 is fixed to the water intake 18 by welding so as to extend in the horizontal direction. Has been. As shown in FIG. 8, this cooling water pipe 19 includes an automatic strainer 20, a plurality of bearing portions 21 of the generator 17, a bearing portion 21 a of the water turbine 16, and an air cooler 21 b for cooling the windings of the generator 17. The water taken from the water intake port 18 passes through the cooling water pipe 19 and cools the bearing portions 21 and 21a and the windings of the generator 17.

  As shown in FIGS. 1 to 3, a strainer 22 having a boat shape having a front oval shape and an arcuate cross section is provided around the water intake 18 on the inner surface of the peripheral wall 14 a of the water flow pipe 14. Are joined by welding so as to bulge inward from the inner surface of the peripheral wall 14a. The center of the strainer 22 is located upstream of the cooling water pipe 19. The strainer 22 is made of steel and has a length of, for example, 1050 mm, a width of 400 mm, and a thickness of 12 mm. Moreover, the bulging height of the strainer 22 into the water flow pipe 14 is, for example, 130 mm.

  As shown in FIG. 1, a large number of circular water intake holes (pores) 23 are formed in the strainer 22 at regular intervals in the vertical and horizontal directions, and the water flowing in the water flow pipes 14 flows into the water intake holes 23. To the cooling water pipe 19. Each intake hole 23 has a diameter of, for example, 22 mm, and impurities 24 such as fallen leaves, wood chips, and dust mixed with the water flowing through the water flow pipe 14 are unlikely to flow into the cooling water pipe 19 from the water intake hole 23. It is like that. The intake holes 23 are not provided at the upstream end and the downstream end of the strainer 22.

  The automatic strainer 20 is composed of a rotating basket having a large number of micro holes (not shown), and removes minute impurities 24 that have not been removed by the strainer 22. The micropores are formed with a diameter of 3.2 mm, for example.

  In the lower half of the strainer 22, one end (fixed end 25 a) of the plurality of chains 25 as swing members is attached to the outer surface of the strainer 22, and the other end (free end 25 b) is not fixed to the strainer 22. It is configured to swing by the flow of water in the water flow pipe 14. For example, the chain 25 is fixed to the strainer 22 by connecting a chain element 26 constituting the chain 25 to a water intake hole 23 of the strainer 22 through a copper wire (not shown).

  A total of 15 chains 25 are attached, for example, three rows in the vertical direction and five rows in the left-right direction (upstream to downstream). The length of each chain 25 is set to 100 to 150 mm, for example, and the interval between the chains 25 in the water flow direction is set to 150 to 200 mm, for example.

  As shown in FIG. 5, the chain 25 is formed by connecting ellipse chain elements 26. Each chain element 26 is made of stainless steel. A ring 27 made of a stainless steel ring formed larger than the water intake hole 23 of the strainer 22 is connected to the free end 25b of each chain 25 in an unfixed state. The ring 27 is configured so that the free end 25 b of the chain 25 is not sucked into the water intake hole 23.

  When the water does not flow into the water pipe 14, it hangs down by its own weight as shown by the solid line in FIGS. 1 and 4, and when the water flows into the water pipe 14, the water flows as shown by the two-dot chain line in FIG. 1. It extends in parallel to the direction of the flow of the gas, that is, substantially in the horizontal direction. Each chain 25 is set to a length that does not come into contact with each other when swung by the flow of water. By such a swinging motion of each chain 25, clogging of the water intake hole 23 due to the contaminants 24 is suppressed.

  As shown in FIG. 4, a coating film 28 is formed on the outer surface of the strainer 22 or on the inner surface 14a of the water flow pipe 14 around the strainer 22, and the outer surface of the strainer 22 and the inner surface of the peripheral wall 14a due to the swinging of the chain 25 are formed. Reduce wear. This paint has excellent adhesion (adhesiveness) and can also exhibit wear resistance. Specifically, an epoxy resin paint, a urethane resin paint, an acrylic-modified urethane resin paint, or the like is used. The coating form may be a form in which a coating 28 is formed by applying a coating, but a form in which the coating 28 is formed in two layers by applying a top coating after applying the undercoat is preferable. Specifically, an epoxy resin paint is used as the undercoat paint, and an acrylic-modified urethane resin paint is used as the top coat paint to form the coating 28 having properties such as adhesion and wear resistance.

The strainer device 30 is constituted by the strainer 22, the chain 25 as the swing member, the coating 28, and the like.
Next, a method of using the strainer device 30 configured as described above will be described together with the operation.

  Now, as shown in FIG. 8, when power is generated in a hydroelectric power station, the water stored in the dam 11 is guided from the water tank 12 to the water turbine 16 through the water flow pipe 14 and generated by the generator 17. . The bearings 21, 21 a of the water turbine 16 and the generator 17 and the air cooler 21 b of the generator 17 are cooled by the cooling water flowing into the cooling water pipe 19 from the water intake 18 of the water flow pipe 14. At this time, a strainer device 30 in which a chain 25 is attached to a strainer 22 is provided at the water intake 18 of the water flow pipe 14.

  As shown by the solid lines in FIGS. 1, 4, and 6, when the strainer device 30 is not used, all the chains 25 are in a suspended state due to their own weight. Next, when the strainer device 30 is used, that is, when water flows into the water flow pipe 14, the other end of the chain 25 is the free end 25b as shown by the arrow in FIG. The end 25b side swings on the outer surface of the strainer 22 so as to draw a semicircular shape (or fan shape) starting from the fixed end 25a by the water flow in the water flow pipe 14. That is, as shown by the one-dot chain line or two-dot chain line in FIG. 6, the free end 25b side of the chain 25 swings (rotates) starting from the fixed end 25a according to the strength, direction, etc. of the water flow, It extends in the direction of water flow.

  As indicated by the two-dot chain line in FIG. 1, the chains 25 are provided in three rows so as to extend in parallel with the flow of water, and are also provided in five rows in the direction of the water flow. Oscillate independently according to the state of the water flowing through the water flow pipe 14.

  By such swinging motions of the many chains 25, foreign matter 24 such as fallen leaves sticking to the outer surface of the strainer 22 can be peeled off from the outer surface of the strainer 22 or separated from the outer surface of the strainer 22. As a result, as shown in FIG. 7, the contaminants 24 are removed from the lower half of the outer surface of the strainer 22, and clogging of the water intake hole 23 is prevented. For this reason, the flow of the cooling water from the water flow pipe 14 to the cooling water pipe 19 can be maintained, and the amount of cooling water and the water pressure can be sufficiently secured.

  Incidentally, the effect was compared between the case where the chain 25 was attached to the strainer 22 and the case where the chain 25 was not attached under the same conditions. As a result, the cooling water amount to the cooling water pipe 19 was maintained at 96% when the chain 25 was attached, whereas a 50% reduction was observed when the chain 25 was not attached. The inlet pressure of the automatic strainer 20 can be maintained 87% (1.28 MPa to 1.11 MPa) when the chain 25 is attached, whereas it is 66% (1. 28 MPa to 0.84 MPa). In addition, the wear amount of the chain 25 made of stainless steel is 0.3 mm in the wire diameter of the chain element 26 after 10 months, and it takes 3.5 years to reduce the wire diameter to 50% or less. Therefore, it was shown that the chain 25 has high durability.

The effects obtained by the embodiment described in detail above are collectively described below.
(1) The strainer device 30 of this embodiment has a chain 25 as a plurality of swinging members, one end of which is fixed to the strainer 22 and the other end is formed in an unfixed state. For this reason, the plurality of chains 25 are swung by the flow of water in the water flow pipe 14, and sticking of the contaminants 24 to the outer surface of the strainer 22 can be suppressed. Therefore, the clogging of the water intake hole 23 of the strainer 22 by the contaminants 24 can be suppressed.

  Therefore, according to the strainer device 30 of this embodiment, the configuration is simple, and the function of the strainer 22 can be maintained over a long period of time. As a result, there is no need to urgently stop the water flow to the water flow pipe 14 and perform the cleaning work of the strainer 22 or to periodically perform the cleaning work of the strainer 22. be able to.

  (2) A plurality of the chains 25 are provided so as to extend in parallel with the flow of water. For this reason, the impurities 24 on the outer surface of the strainer 22 can be effectively removed using the flow of water.

  (3) The water intake 18 is provided at the center of the side of the water flow pipe 14, and a plurality of chains 25 are provided in the direction of water flow in the lower half of the strainer 22. It is arranged not to touch. Therefore, when the free end 25b moves from the state where the chain 25 hangs down under its own weight in the direction in which water flows, the foreign matter 24 on the outer surface of the strainer 22 can be efficiently wiped off. In addition, since the plurality of chains 25 are configured so as not to contact at the time of swinging, each chain 25 can swing independently, and the removal of the contaminants 24 by the chain 25 can be effectively advanced. .

  (4) As described above, the swing member is constituted by the chain 25. For this reason, the chain elements 26 constituting the chain 25 can move relatively with the flow of water, and the removal efficiency of the contaminants 24 can be improved.

  (5) One end of the chain 25 is fixed to the strainer 22, and a ring 27 formed larger than the water intake hole 23 is connected to the other end of the chain 25. In this case, the other end of the chain 25 can be prevented from being sucked into the water intake hole 23 of the strainer 22, and the removal of the impurities 24 can be continued.

  (6) A coating film 28 is formed on the outer surface of the strainer 22 with a paint that has good adhesion and can exhibit wear resistance. For this reason, wear due to contact between the chain 25 and the outer surface of the strainer 22 can be suppressed, and the removal of the contaminants 24 by the chain 25 can be continued for a long time.

  (7) The strainer 22 has a boat shape and is configured to bulge into the water flow pipe 14. Therefore, the strength of the strainer 22 can be increased, the area of the strainer 22 can be increased, and a sufficient supply amount of cooling water from the water flow pipe 14 to the cooling water pipe 19 can be secured.

  (8) The water flow pipe 14 is a hydraulic pipe of a hydroelectric power plant, and the intake 18 is cooled to cool the bearing portion 21 of the generator 17, the bearing portion 21a of the water turbine 16, and the winding of the generator 17. A water pipe 19 is connected. In this case, in the hydroelectric power station, the stop of the generator 17 can be suppressed and the operation of the generator 17 can be continued, and the management level of the hydroelectric power station can be improved.

  (9) When the strainer device 30 is not used, the chain 25 hangs down due to its own weight, and when the strainer device 30 is used, the strainer device 30 is swung by the water flowing through the water flow pipe 14. This removes the foreign matter 24 that sticks to the surface. Therefore, clogging of the strainer 22 can be easily suppressed by swinging the chain 25 with the flow of water.

  (10) A plurality of the chains 25 are provided so as to extend in parallel with the water flow, and a plurality of the chains 25 are provided in the direction of the water flow, and each chain 25 is uniquely swung by the water flowing in the water flow pipe 14. Then, the impurities 24 sticking to the strainer 22 are removed. In this case, the plurality of chains 25 work independently, and the removal efficiency of the contaminants 24 by the chains 25 can be increased.

It should be noted that the embodiment described above can be modified and embodied as follows.
-As said rocking | swiveling member, you may use what connected the some metal rod, the metal wire, and the metal pipe so that each could rotate relatively.

  -In the said embodiment, you may arrange | position the chain 25 in 2 rows, 4 rows, etc. so that it may be parallel to the flow of water. Further, the distance between the chains 25 in the direction of water flow may be increased, and the length of the chain 25 itself may be set longer.

The plurality of chains 25 may be provided in the upper half and the lower half of the strainer 22.
The arrangement of the plurality of chains 25 may be set in a zigzag pattern or randomly within a range that does not interfere with each other.

The shape of the chain element 26 that constitutes the chain 25 may be formed in a circular shape, an elliptical shape, an asymmetric shape, or the like. Further, a steel wire or the like may be used as the material of the chain element 26.
-You may change suitably the shape of the said strainer 22, a bulging height, etc. As shown in FIG.

  The chain 25 may be configured such that when the chain 25 is swung by a water flow, the free end 25b side contacts (interferences) with the fixed end 25a side of the adjacent chain 25. In this case, the foreign matter 24 adhering to the fixed end 25a side of the chain 25 having a narrow swing range hits the free end 25b side of the adjacent chain 25, and the foreign matter 24 can be shaken off and removed. Therefore, the accumulation of the foreign matter 24 on the free end 25b side of the chain 25 can be suppressed.

  -You may comprise the said water intake 18 so that it may provide in positions other than the side center position of the water flow piping 14, for example, the upper center position of the water flow piping 14. FIG.

  DESCRIPTION OF SYMBOLS 14 ... Water flow piping, 14a ... Perimeter wall, 17 ... Generator, 18 ... Water intake, 19 ... Cooling water piping, 21, 21a ... Bearing part, 21b ... Air cooler, 22 ... Strainer, 23 ... Water intake hole, 24 ... Contaminants, 25... Chains as swing members, 27. Rings, 28. Coatings, 30.

Claims (9)

  The water intake is configured to take water from a water intake provided in a peripheral wall of the water flow pipe, and the water intake has a plurality of water intake holes and a strainer for blocking impurities in the water. A strainer device comprising: a plurality of oscillating members that are fixed to the strainer and whose other end is not fixed to the strainer and that oscillates by the flow of water and prevents clogging of the water intake holes due to contaminants.   2. The strainer device according to claim 1, wherein the intake port is provided at a central position on a side portion of the water flow pipe, and a plurality of swing members are provided so as to extend in parallel with the flow of water in a lower half portion of the strainer.   The intake port is provided at the central position of the side of the water flow pipe, and a plurality of swing members are provided in the direction of water flow in the lower half of the strainer so that the swing members do not contact each other when swinging. The strainer apparatus of Claim 1 or Claim 2 arrange | positioned.   The strainer device according to any one of claims 1 to 3, wherein the swing member is configured by a chain.   The strainer device according to claim 4, wherein one end of the chain is fixed to a strainer, and a ring formed larger than the water intake hole is connected to the other end of the chain.   The strainer device according to any one of claims 1 to 5, wherein a coating film is formed on an outer surface of the strainer.   The water flow pipe is a hydraulic pipe of a hydroelectric power plant, and a cooling water pipe for cooling at least a bearing portion of the generator is connected to the intake port. The strainer device described. A method of using the strainer device according to any one of claims 1 to 7,
When the strainer device is not used, the swinging member hangs down by its own weight, and when the strainer device is used, the swinging member swings due to the water flowing in the water passage pipe, and removes impurities adhering to the strainer. How to use the strainer device.   A plurality of the swinging members are provided so as to extend in parallel with the flow of water, and a plurality of swinging members are provided in the direction of the water flow, and each swinging member swings independently by the water flowing in the water flow pipe. The use method of the strainer apparatus of Claim 8 which removes the foreign material adhering to a strainer.

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