JP5221583B2 - Drainage equipment - Google Patents

Description

  The present invention relates to a drainage device installed to discharge water in a pipe to the outside of the pipe as a maintenance management measure such as water quality in a water pipe.

  In recent years, there is an increasing need for further improvement of tap water quality. In order to provide delicious water to water users, each business entity and other various organizations are making efforts to maintain and manage water quality, etc. to optimize residual chlorine concentration.

  As one of the maintenance management measures such as water quality, drainage is performed for the purpose of replacing water in a staying area generated in a water pipe. In general, there are a regular drainage system that always drains a certain amount of water, a regular drainage system that is operated by an operator, and an automatic drainage system that automatically drains water according to certain requirements (for example, Patent Document 1, Patent Document). 2).

  In the maintenance management measures such as water quality by these drainage methods, there is always a problem of cost for drainage. That is, a large amount of water is wasted in the regular drainage method, and there are problems such as securing workers in the regular drainage method. Further, the automatic drainage system has a problem that the cost for maintenance of the facility, particularly, the amount of electric power increases. For this reason, establishment of a more efficient drainage method is required.

By the way, the following two approaches can be considered as an efficient drainage method. One is a method for obtaining an effective water replacement effect with a smaller amount of drainage, specifically, to elucidate the mechanism of the amount of drainage and water exchange in the pipeline.
However, since various calculation conditions (deformed pipe, number of valves, inner surface conditions, etc.) exist as factors in the actual pipeline, it is difficult to achieve efficient and efficient drainage by this approach.

As the second approach, there is a method of performing reliable water replacement by discharging a large amount of drainage, contrary to the first approach.
However, simply draining more than necessary does not provide an efficient drainage method in terms of the cost burden described above.

  Therefore, while draining water more than necessary for the replacement effect of water, a method to improve the efficiency of drainage work in terms of energy by collecting and effectively using the hydraulic energy generated during this drainage should be studied. Can do.

  In general, as a technique for recovering hydraulic energy generated during drainage, for example, a discharge port head equipped with a generator having a function of generating electricity by a water flow can be attached to and detached from a tap faucet. Technology for recovering the accompanying hydraulic energy as electric power, or technology for attaching such a generator, a rechargeable battery connected to it, a stabilizer, etc. to a water pipe drawn from a water tower or a faucet for water supply is disclosed. (For example, refer to Patent Document 3 and Patent Document 4).

JP 2007-198033 A JP 2006-257661 A JP 2002-38563 A JP 2003-64743 A

  In such a drainage facility, for example, when the water pipe related to the staying area is a private road buried, or when there is a private land in the vicinity, it is relatively easy to secure an installation space on the ground.

  However, many water pipes are buried in public roads, and drainage facilities are often placed in pits (valve chambers) dug in the public roads. These pits generally have a small cross section (cross section in plan view), and the internal space is often narrow. For this reason, in that pit, it is often difficult to accommodate a power generation facility in addition to a valve device necessary for drainage.

In particular, examples of the power generator adopted for the water distribution pipe of the water tower include small micro hydropower generators, etc., but these power generators have an output of about 100 kW and an excessive output. This is because the water flow of the drainage facility corresponds to the amount of power generation that can be used for charging the power source of the power consumption equipment that is less than 100 W.
In addition, the micro hydropower generator and the like have a large external dimension, and there are currently no micro hydropower generators that can fit in the pits for existing drainage facilities.

  Accordingly, an object of the present invention is to provide a power generation device that can be accommodated in a pit in a drainage facility for a water pipe provided in the pit.

  In order to solve the above problems, the present invention comprises a drain pipe installed in a pit excavated in the ground and drawn out from a water pipe, and a valve device for opening and closing the drain pipe, In the drainage facility having a function of discharging the accumulated water to the outside through the drain pipe, a cylindrical casing is disposed in the pit so that the cylinder axis direction is in the vertical direction. A turbine that is rotatable around a direction axis, and a generator disposed at the top of the turbine, the generator has a function of generating electric power by rotation of the turbine, and the drain pipe is The water that has entered the casing from the drain pipe rotates the turbine in communication with the space in the casing through a connection port that penetrates the inside and outside of the casing on the side of the turbine. The water was adopted drainage, characterized in that it is discharged outside through the discharge port formed in a lower end of the casing.

According to this configuration, since a cylindrical casing extending in the vertical direction is adopted as a space for accommodating the generator, a drainage facility for the purpose of optimizing residual chlorine concentration, which is one of tap water quality maintenance management measures In other drainage facilities for the purpose of water quality maintenance and management, in the introduction of hydroelectric generators for effective use of hydraulic energy during drainage, in the narrow space of pit (valve chamber) level excavated underground However, it is possible to realize a device that can be sufficiently accommodated.
With this configuration, for example, pits (valve chambers) are used not only in places where it is inconvenient for workers such as mountainous areas, but also in places where it is difficult to obtain installation space for hydroelectric generators in urban areas. By doing so, it becomes possible to install a hydroelectric generator and use it in various drainage places as well as drainage for water quality maintenance management.

  Moreover, in each of these configurations, the discharge port is opened downward, and a configuration in which water is discharged laterally through the bent tube can be adopted by attaching the bent tube to the discharge port.

  By attaching such a bent pipe to the discharge port of the casing that opens downward, water is discharged sideways through the bent pipe, and the piping that leads to the outside of the pit becomes easy. Normally, in order to prevent the equipment in the pit from being submerged due to the drainage, the drainage may be discharged to a nearby drainage destination such as a sewer, a gutter, or a drainage basin through a guide pipe that penetrates the wall of the pit. Since there are many, it is convenient to use such a bent tube.

Further, in each of these configurations, a flange portion protruding outward is provided on the outer wall of the casing, and a frame rising from the bottom of the pit is fixed to the flange portion, and the casing is connected to the pit via the frame. A configuration held inside can be adopted.
Since the frame can be fixed to the flange provided in the casing, there is no need to support the casing with a water pipe, and the generator and the casing can be fixed by a method according to the site.

  In this way, in the configuration in which the casing is held by the frame, the frame includes a holding member that abuts the upper surface of the flange portion, and a bolt inserted into a vertical hole provided in the holding member includes the flange. It is possible to adopt a configuration in which the casing and the frame are fixed by being screwed downward from the upper surface of the part.

  According to this configuration, since the screwing direction is up and down, the work can be performed without an operator entering the pit, and a tool such as a screwdriver used for the work is unlikely to interfere with the inner wall of the pit. For this reason, the work in a narrow pit becomes easy.

  In each of these configurations, a partition that partitions the space in the casing into an upper chamber and a lower chamber is provided, the generator is disposed in the upper chamber, and the turbine is disposed in the lower chamber. Can be adopted.

  In the configuration including the upper chamber and the lower chamber, the turbine includes a cylindrical rotating shaft extending in the vertical direction and a blade member extending outward from the rotating shaft, and the power generation is provided inside the rotating shaft. A generator shaft included in the machine enters and the rotation shaft and the generator shaft rotate integrally, and the rotation shaft is inserted into a vertical insertion hole provided in the partition wall, and the rotation shaft By providing an oil seal that tightly closes the space between the outer surface and the inner surface of the insertion hole, it is possible to employ a configuration in which the water in the lower chamber is not touched by the generator shaft.

  According to these structures, the generator which is not preferable to touch water and the turbine which presupposes touching water can be arrange | positioned in a separate chamber via a partition. Further, covering the generator shaft with the rotating shaft of the turbine is effective in preventing contact with water that causes corrosion.

  The present invention can provide a power generator that can be accommodated in a pit in a drainage facility for a water pipe provided in the pit.

Perspective view of one embodiment (A) (b) is a top view which shows the shape of the pit which arrange | positions drainage equipment Configuration diagram of a device for operating a generator and a valve device Perspective view showing details of casing and frame Exploded perspective view showing casing and generator Turbine perspective view Cross section of the main part of the casing Explanatory drawing showing the situation when draining to the ground (surface) (A) (b) is detailed drawing which shows a casing and piping for drainage The perspective view which shows the process at the time of constructing drainage and a pit The perspective view which shows the process at the time of constructing drainage and a pit (A) and (b) are detailed views of the connection between the drainage pipe and the guide pipe

  An embodiment of the present invention will be described with reference to the drawings. This embodiment is a drainage facility for maintenance management measures such as water quality installed in a pit P excavated in the ground. This drainage facility is provided at a location where the accumulated water in the water pipe 1 is likely to be generated.

  As shown in FIG. 1, a drain pipe (drain pipe) 2 drawn from the water pipe 1 extends upward. Further, a valve device 3 for opening and closing the drain pipe 2 is provided in the middle of the drain pipe 2. In this embodiment, an electric valve is used as the valve device 3, but an electromagnetic valve may be used. By opening and closing the valve device 3, the accumulated water in the water pipe is discharged to the outside through the drain pipe 2.

  As shown in FIG. 1, the drainage facility is disposed in a pit (valve chamber) P excavated downward from the ground surface. The pit P may have a rectangular internal space in plan view as shown in FIG. 2 (a), or may have a circular internal space in plan view as shown in FIG. 2 (b). The shape is not limited.

  The drainage facility is provided with a hydroelectric generator 20. As shown in FIG. 3, the configuration of the hydroelectric generator 20 includes a generator 23 having a function of converting a water flow into electric energy, and a battery 24 that stores the generated electric power by charging. Further, an adjusting device 25 including a rectifier circuit 25a, a charging voltage adjusting circuit 25b, and the like is interposed between the battery 24 and the generator 23.

  Further, the valve device 3 is opened and closed by electric power supplied from the battery 24. In order to perform this operation, a control device 26 including an inverter 26a and an open / close timer 26b is interposed between the battery 24 and the valve device 3. Note that a DC power source may be used as this power source.

  In the pit P, a casing 10 is disposed as shown in FIG. The casing 10 has a cylindrical shape, and is fixed by a frame 30 in the pit P so that the cylinder axis direction is in the vertical direction (see FIG. 4 for the frame 30. In FIG. (The illustration is omitted.) In addition, in this embodiment, although the casing 10 is cylindrical shape, it is good also as a rectangular tube shape.

  In the casing 10, as shown in FIG. 7, a turbine T composed of a rotary shaft 22 in the vertical direction and a blade member 21 provided around the rotary shaft 22, and power generation disposed on the upper portion of the turbine T. A machine 23 is provided.

  FIG. 6 is a detailed view of the turbine T. The rotating shaft 22 has a cylindrical shape, and a generator shaft (input shaft) 23a of the generator 23 is inserted therein. The generator shaft 23a and the turbine T are fixed by a flange bolt 29 via a seal washer 28, the bottom of the cylindrical rotating shaft 22 is closed in a liquid-tight manner, and can be rotated integrally around the shaft. ing.

  The space in the casing 10 is divided into two chambers, an upper chamber A and a lower chamber B, by a partition wall 16 in the horizontal direction. The generator 23 is fixed to the upper chamber A on the partition wall 16 by a bolt 23c or the like via a bush 23b or the like (see FIG. 5). The upper part of the casing 10 is closed with a lid 10a.

  Further, the partition wall 16 is provided with an insertion hole 17 in the vertical direction. The insertion hole 17 penetrates the partition wall 16 up and down. The rotation shaft 22 of the blade member 21 is inserted through the insertion hole 17 through an oil seal 27. The rotary shaft 22 is supported by the partition wall 16 so as to be rotatable about the axis through the oil seal 27, and the space between the outer surface of the rotary shaft 22 and the inner surface of the insertion hole 17 is closed in a liquid-tight manner.

  As shown in FIGS. 4 and 5, the casing 10 is provided with a flange portion 14 protruding outward on the outer wall thereof. The portion where the flange portion 14 of the casing 10 is interposed is formed thicker than the portion other than the flange portion 14 of the casing 10. The partition wall 16 is provided above the position of the flange 14. The generator 23 is disposed on the partition wall 16.

  In addition, the wiring from the generator 23 arranged in the casing 10 extends from the casing 10 through the through-hole 11 penetrating the inside and outside of the casing 10 in the upper chamber A, that is, above the flange portion 14. It is pulled out of the casing 10. A wiring adapter 11a is attached to the through hole 11 so that wiring can be performed (see FIG. 5).

  On the other hand, the drain pipe 2 drawn out from the water pipe 1 is connected in a lower chamber B of the casing 10 so as to communicate with a connection hole 15 provided so as to penetrate the inside and outside of the casing 10.

  The connection hole 15 opens in the casing 10 (lower chamber B) to the side of the blade member 21 of the turbine T, and outside the casing 10 on the side surface of the flange portion 14. Is open.

  The drain pipe 2 communicates with the space in the casing 10 through the connection port 15. That is, the drain pipe 2 communicates with the space in the casing 10 through the connection hole 15 provided on the side of the blade member 21. The drain pipe 2 is connected to the casing 10 so as to communicate with the connection hole 15 through a plug nozzle 18, a nozzle adapter 19, and the like provided in the connection hole 15.

  For this reason, the water that has entered the casing 10 (lower chamber B) from the drain pipe 2 rotates the turbine T, that is, the blade member 21 around the axis of the rotary shaft 22 by the momentum of the water flow. The generator shaft 23a is also rotated by the rotation of the turbine T, and the generator 23 performs predetermined power generation. The generated electricity is charged into the battery 24 through the adjusting device 25 (see FIG. 3).

  At this time, since the rotating shaft 22 is inserted into the insertion hole 17 through the oil seal 27, the watertightness between the upper chamber A and the lower chamber B is maintained. For this reason, the water in the lower chamber B is prevented from entering the upper chamber A.

  The water that has entered the casing 10 (lower chamber B) then falls downward in the casing 10 (lower chamber B) and is discharged to the outside through a discharge port 12 provided at the lower end of the casing 10. The discharge port 12 is a lower end side opening of the casing 10 which has a cylindrical shape.

  The discharge port 12 is opened downward toward the outside of the casing 10, and the bent pipe 13 is attached to the discharge port 12 as the drainage pipe E, whereby water is discharged sideways through the bent pipe 13. It has become so. Further, as shown in FIG. 1, the tip of the bent pipe 13 is connected to a guide pipe 5 penetrating the wall portion of the pit P, and the drainage is passed through the guide pipe 5 to a nearby sewer, a gutter, a water collecting tank. It is discharged to the drainage destination.

  In this embodiment, the casing 10 is held in the pit P via a frame 30 rising from the ground at the bottom of the pit P.

  As shown in FIG. 4, the frame 30 includes four main members 32 having an L-shaped cross-section rising from the ground, and the four main members 32 are connected by horizontal beams 35. A holding member 31 having an L-shaped cross section is fixed to the upper portion of the main material 32 with screws 34 or bolts and nuts.

  The holding member 31 is in contact with the upper surface of the flange portion 14, and the bolt 33 inserted through the vertical hole provided in the holding member 31 is downward from the upper surface with respect to the hole 36 opened on the upper surface of the flange portion 14. By being screwed in, the casing 10 and the frame 30 are fixed. Since the inside of the pit P is narrow, there is a great merit that the bolt 33 can be screwed from above. Since the screwing direction is up and down, the work can be performed without an operator entering the pit P, and a tool such as a screwdriver used for the work does not easily interfere with the inner wall of the pit P.

  The generator 23 used in this embodiment has a structure in which, for example, a turbine T (blade member 21 including the rotating shaft 22) is directly attached to a small three-phase AC generator equivalent to a rated output of 0.6 KVA. Yes. By directly attaching the generator 23 and the turbine T, a rotation transmission mechanism (V-belt or the like) is unnecessary, and the external dimensions of the device can be reduced.

  By the way, when the generator 23 and the turbine T are directly attached in this way, the drainage (jet water flow from the plug nozzle 18) when rotating the turbine T hits the blade member 21 of the turbine T and is scattered around. To do.

  Therefore, in this embodiment, as shown in FIG. 7, the rotating shaft 22 of the turbine T is a cylindrical generator shaft impermeable portion, and the generator shaft 23 a of the generator 23 is inserted therein. In addition, the lower chamber B side of the generator shaft impermeable portion is liquid-tightly sealed with a seal washer 28 and a flange bolt 29.

  That is, since the generator shaft 23a is covered with the members constituting the turbine T and is not exposed to the lower chamber B side, the scattered water is prevented from adhering to the generator shaft 23a. For this reason, even if the generator shaft 23a is made of, for example, iron, the occurrence of corrosion is suppressed (see FIG. 7).

  Further, the turbine T of this embodiment is a so-called impulse water turbine, and the pressure water from the water pipe 1 and the drain pipe 2 is converted into a jet water flow by the plug nozzle 18 provided in the connection hole 15 of the casing 10. High-speed rotation of the turbine T is realized.

  As described above, by converting the pressure head of the water pipe 1 into the flow speed head by nozzle injection, most of the energy can be used as the motive energy of the turbine T. In the casing 10, the jet water flow collides with the turbine T that rotates at high speed, so that the water receives centrifugal force and is scattered in the casing 10. Furthermore, the water injected into the turbine T loses momentum and has only a water level head.

  Therefore, the water after being injected into the turbine T needs to be led to a drainage destination (the sewer etc.) by natural flow. However, at this time, if the drainage of the water after being injected into the turbine T is not smooth, the water affects the rotation of the turbine T, and the rotation efficiency decreases.

  Under the general generator installation conditions, the water after being injected into the turbine T can be thrown down as it is, and there is no need to consider water draining. However, in the present invention, the narrow pit P The cylindrical casing 10 as described above is used because it is intended for installation inside. For this reason, it becomes an important subject to discharge | emit the water smoothly injected below to the turbine T below.

  In this regard, for example, when drainage is performed in the pit P by a method similar to the drainage method on the ground (ground surface) G shown in FIG. 8, the interior of the pit P is submerged by drainage, and the turbine T rotates. There are cases where adverse effects may occur. Therefore, it is desirable to guide the water after being injected into the turbine T to the drainage destination outside the pit P without dropping into the pit P.

  Therefore, in this embodiment, as shown in FIG. 9, a cylindrical casing 10 that is premised on installation in the pit P is prepared, and the drainage pipe E is provided in the discharge port 12 provided below the casing 10. Can be connected. At this time, it is desirable that the diameter of the drainage pipe E connected to the casing 10 is as large as possible in order to facilitate drainage, but in this embodiment, the diameter is the same as or larger than the outer diameter of the casing 10. A slightly smaller diameter drainage pipe E can be connected.

  In addition, the drainage pipe E can be attached to a PVC standard size pipe as a pipe having a relatively low resistance to the drainage under natural flow (low roughness coefficient).

  As the connection structure of the drainage pipe E, the shape of the discharge port 12 at the lower end of the casing 10 can be, for example, a design of a PVC pipe receiving size conforming to the VU125A socket (the embodiment is assumed to be 125A). In the discharge port 12, for example, a PVC straight pipe (VU) can be directly joined to the casing 10.

  Further, in this embodiment, as shown in FIGS. 9A and 9B, a 90-degree bent pipe (elbow pipe) 13 made of a polyvinyl chloride pipe is joined below the straight pipe as the drainage pipe E. It is possible.

  That is, since the drainage facility is installed in the pit P, the installation height of the generator 23 in the pit P with respect to the ground surface (road surface) is restricted by various regulations such as water pipe laying conditions. For this reason, it is desirable that the installation height of the casing 10 can be adjusted each time according to the site. When the installation height of the casing 10 changes, the length of the drainage pipe E to be connected to the lower discharge port 12 also changes. This is because it must be adjusted to the height of the guide pipe 5 leading to the outside of the pit P.

  Therefore, in this embodiment, as the material for the drainage pipe E, the use of a PVC pipe that is easy to cut on-site (can be cut with a saw or the like) makes it easy to adjust the pipe length. That is, according to the installation height of the casing 10, the length of the drainage pipe E connected to the discharge port 12 can be adjusted. For this reason, it becomes easy to install the casing 10 in the height according to the field.

In addition, a method for newly installing such a drainage facility on the water pipe 1 will be described. First, when a drainage pipe 2 is newly installed, for example, as shown in FIG. Can be used. In FIG. 10, the water faucet 8 is fastened and fixed to the outer periphery of the water pipe 1 by a pair of saddle members 4, 4 having an arc shape, and the drain pipe 2 is connected to the water faucet 8.
By using this kind of saddle-equipped water faucet, water leakage during construction can be minimized, and it is easy to newly install a drain pipe 2 for an existing water pipe 1.

  As shown in FIG. 10, a gate valve 6 for repairing devices, the valve device 3, and a flow rate adjusting valve 7 are attached to the drain pipe 2 drawn from the water pipe 1. The casing 10 is connected to the end of the drain pipe 2.

In addition, when the guide pipe 5 leading to the drainage destination outside the pit P is not prepared, the core of the wall portion of the pit P is removed in order to insert the guide pipe 5. The wall of the pit P can be constructed, for example, by stacking cylindrical blocks on the foundation C as shown in the figure. After the core is cored, the guide tube 5 is inserted into the hole generated by the core removal. The guide pipe 5 is connected at its downstream end to a pipe line leading to a drainage destination, and the upstream end is connected to the discharge port 12 of the casing 10 by a drainage pipe E such as the vinyl chloride pipe.
Further, the core-extracted portion is subjected to caulking or the like along the outer periphery of the guide pipe 5 to take measures to prevent water from the ground from being mixed into the pit P (see FIG. 11).

  At this time, the pipe diameter of the guide pipe 5 leading to the outside of the pit P may be restricted by the core removal or the burying condition. This is the case when the diameter of the core already provided is small, or when the position of the pipe axis of the guide pipe 5 already provided is deviated from the position of the pipe axis of the drainage pipe E. In such a case, drainage can be performed with an appropriate pipe diameter by using, for example, a polyvinyl chloride increaser 5a shown in FIG. 12A or an eccentric bushing 5b shown in FIG. It is possible to guide the service pipe E to the guide pipe 5.

  Thereafter, as shown in FIG. 1, the adjusting device 25, the control device 26 and the like are installed in the space in the pit P. The wiring from the generator 23 in the casing 10 is drawn out of the casing 10 through the through hole 11 and connected to the adjusting device 25, the control device 26, and the like fixed in the pit P.

  In this embodiment, it is assumed that the pit P and the drainage facility are newly installed, or the drainage pipe 2 is newly drawn from the water pipe 1 in the existing pit P. For example, the existing pit P Even if a fire hydrant facility or the like provided in the interior is used, the drainage facility having the configuration of the present invention can be provided.

  In this case, as a method for installing the drainage facility, in the fire hydrant facility or the like, first, the existing fire hydrant connected to the branch pipe portion rising from the water pipe 1 is removed. This removal is performed by loosening bolts and nuts that tighten the flange at the upper end of the branch pipe and the flange at the lower part of the fire hydrant, thereby separating the flanges. After removing the fire hydrant, a flange lid having an opening for taking out the drain pipe 2 is set on the flange at the upper end of the branch pipe section, and the drain pipe 2 is connected to the opening. The work after the drainage pipe 2 has been pulled out is the same as in the case of the above-mentioned new installation.

  In general, since a hydroelectric generator is a relatively heavy object including an AC generator, it is protected so that no load is applied to the drainage pipe 2, the drainage pipe E, the induction pipe 5 and the like installed at the time of installation. There is a need to. In the present invention, the casing 10 is provided with a hole 36 for screwing the bolt 33 into the upper surface of the flange 14 provided on the outer periphery thereof, and the casing 10 can be supported by the frame 30 through the hole 36. The generator 23 and the casing 10 can be fixed by the method.

DESCRIPTION OF SYMBOLS 1 Water pipe 2 Drain pipe 3 Valve apparatus 4 Saddle member 5 Guidance pipe 6 Gate valve 7 Flow control valve 8 Water faucet 10 Casing 10a Lid 11 Through-hole 11a Wiring adapter 12 Discharge port 13 Bend pipe 14 Hook part 15 Connection hole 16 Bulkhead 17 Insertion hole 18 Plug nozzle 19 Nozzle adapter 20 Hydroelectric generator 21 Blade member 22 Rotating shaft 23 Generator 23a Generator shaft 24 Battery 25 Adjustment device 26 Control device 27 Oil seal 28 Seal washer 29 Flange bolt 30 Frame 31 Holding member 32 Main Material 33 Bolt 33a Nut 34 Screw 35 Cross beam 36 Hole A Upper chamber B Lower chamber C Foundation E Drain piping P Pit T Turbine

Claims (6)

A drain pipe (2) installed in the pit (P) excavated in the ground and drawn from the water pipe (1), and a valve device (3) for opening and closing the drain pipe (2), In the drainage facility having a function of discharging the accumulated water in the water pipe (1) to the outside through the drain pipe (2),
A cylindrical casing (10) is disposed in the pit (P) so that the cylinder axis direction is in the vertical direction, and in the casing (10), the turbine is rotatable around an axis in the vertical direction. (T) and a generator (23) disposed on the upper portion of the turbine (T), the generator (23) has a function of generating electric power by rotation of the turbine (T), The drain pipe (2) communicates with the space in the casing (10) through a connection port (15) provided through the inside and outside of the casing (10) on the side of the turbine (T). Then, the water that has entered the casing (10) from the drain pipe (2) rotates the turbine (T), and the water is discharged to the outside through the discharge port (12) provided at the lower end of the casing (10). Drainage facility characterized by being discharged.   The discharge port (12) is opened downward, and water is discharged laterally through the bent tube (13) by attaching the bent tube (13) to the discharge port (12). The drainage facility according to claim 1.   The outer wall of the casing (10) is provided with a flange part (14) protruding outward, and the frame (30) rising from the bottom of the pit (P) is fixed to the flange part (14). The drainage system according to claim 1 or 2, wherein the casing (10) is held in the pit (P) through 30).   The frame (30) includes a holding member (31) that comes into contact with the upper surface of the flange portion (14), and a bolt (33) inserted through a vertical hole provided in the holding member (31) includes the flange (14). The drainage system according to claim 3, wherein the casing (10) and the frame (30) are fixed by being screwed downward from the upper surface of the portion (14).   A partition wall (16) for partitioning a space in the casing (10) into an upper chamber (A) and a lower chamber (B) is provided, and the generator (23) is disposed in the upper chamber (A), and the turbine (T) is arrange | positioned in the said lower chamber (B), The drainage apparatus as described in any one of the Claims 1 thru | or 4 characterized by the above-mentioned.   The turbine (T) includes a cylindrical rotating shaft (22) extending in the vertical direction and a blade member (21) extending outward from the rotating shaft (22), and inside the rotating shaft (22), The generator shaft (23a) included in the generator (23) enters and the rotating shaft (22) and the generator shaft (23a) rotate integrally, and the rotating shaft (22) An oil seal (27) that is inserted through a vertical insertion hole (17) provided in the partition wall (16) and closes the space between the outer surface of the rotating shaft (22) and the inner surface of the insertion hole (17). The drainage system according to claim 5, wherein water in the lower chamber (B) is prevented from touching the generator shaft (23a).

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