JP2503079Y2 - Tandem type automatic strainer - Google Patents

Description

[Detailed description of the device]

[0001]

FIELD OF THE INVENTION The present invention relates to an automatic strainer for a hydroelectric power plant.

[0002]

2. Description of the Related Art In a hydroelectric power plant, cooling water is indispensable for cooling metal, lubricating oil, pressure oil and the like. Some cooling water uses spring water, mountain streams, and penstock water. The most ideal cooling water is spring water, but it requires a considerable amount of water constantly, and there are very few available places. Therefore, in most hydropower plants, the cooling water taken in from the penstock is passed through an automatic strainer to remove dust to some extent and used.

An automatic strainer used in a conventional hydroelectric power plant has a structure in which treated water = raw water is taken in from a water inlet and is filtered by a coarse screen having a diameter of 4, 5 to 5, 0 mm. The raw water taken in is supplied as clean water through the coarse screen.

From the viewpoint of removing dust, the strainer used in a hydroelectric power plant removes dust through a screen with innumerable holes having a diameter of about 50 mm, and a manual strainer is disassembled during regular inspections. After cleaning and continuing the operation, the automatic strainer changes the flow direction of the dust attached to the screen, suspends the dust attached to it, and discharges it to the drain pipe to clean the inside of the screen. All of these are done automatically and put into practical use. On the other hand, as literature materials, Japanese Patent Application Laid-Open No. 48-82472, in which a cylindrical filter is provided in series and treated water is filtered while constantly cleaning both filters with a brush or the like, and a cylindrical filter is rotated. Japanese Unexamined Patent Publication No. 50-14697 discloses a technique for filtering treated water while constantly cleaning the filter. However, these disclosed techniques have a configuration in which the water to be treated is supplied from the outside of the filter, and two types of clean water and fresh water cannot be taken out after the treatment.

[0005]

There is a water sealing device on a water wheel shaft of a hydroelectric power plant in order to prevent water from being blown out from the water wheel to the outside. These include a gland packing method and a sealing metal that utilizes sealing pressure. These water sealing devices have various problems in terms of operation and maintenance, and in recent years the water sealing devices have been improved, and new water sealing devices have been introduced, albeit little by little.

[0006] This new type water sealing device requires cooling water which has a small amount of water but also serves as cooling and lubrication. Further, the cooling water is required to have a quality close to that of fresh water which cannot be obtained by the conventional automatic strainer. In order to respond to this request, it is the current situation that a finer strainer or filtration device (hereinafter referred to as a secondary filtration device) is installed to supply water.

However, none of these secondary filtration devices are compatible with each other in terms of labor saving in maintenance and cost, and the operation is left to inspection and cleaning by an operator. This is a problem that must be urgently solved in view of stable operation and burdens on operators, due to requests for labor saving and simplification of maintenance management.

[0008]

According to the request, the present invention is basically based on the idea of providing another fine screen in series on the basis of the conventional automatic strainer of a hydroelectric power plant. We have developed a dandem type automatic strainer that can easily clean both screens and can obtain cooling water close to fresh water as needed without making major changes to the installation location and structure of conventional strainers.

An object of the present invention is to provide an automatic strainer for a hydroelectric power plant in which clean water and fresh water are continuously supplied by one strainer and cleaning of a screen is automated. To supply clean water and fresh water, a coarse screen and a fine screen are arranged in series on the same rotary shaft, and the filtered water on the coarse screen is used as clean water for conventional cooling water. Water) is introduced to a fine screen and filtered again to make clear water. The obtained fresh water can be used as fresh water for cooling the water wheel shaft water seal portion. For cleaning and cleaning both screens, a drainage chamber that communicates with the insides of both screens is provided between the two screens and is connected to a discharge valve that is normally closed, and the rotating shaft is rotated to rotate both screens to float dust. Then, the discharge valve is opened to automatically discharge dust.

According to the present invention, the cylindrical coarse screen 2 forming the first dust collecting chamber and the cylindrical fine screen 3 forming the second dust collecting chamber in the cylindrical strainer case 1 are rotated in the same rotation. Vertical series on the axis 4 (Tandem
= Tandem), a water intake pipe 5 for supplying water to be treated is connected to the inside of the coarse screen 2, and a clean water chamber 6 is provided around the outer side of the coarse screen 2.
A clean water supply pipe 7 and a diversion pipe 8 are provided for water separation, the diversion pipe 8 is connected to the inner side of the fine screen 3, and a fresh water feed pipe 9 for leading out fresh water is provided around the outer side of the fine screen 3. A clean water room 10 is provided, and both screens 2.3
Drainage chamber 17 communicating with the inside of both screens 2 and 3 between
It is connected to a drain pipe 12 equipped with a discharge valve 11 for dust, etc., which is normally closed and is used for continuous supply of clean water and fresh water and for cleaning (when cooling water pressure drops due to clogging or at regular intervals). Both screens 2 are controlled by the control device
Provide a tandem type automatic strainer characterized in that 3 is rotated to float the dust and the discharge valve 11 is opened to automatically discharge the dust. In order to float the dust from both screens 2 and 3, the rotation speed and rotation direction of the rotation shaft 4 are changed to control the direction and force of the water flow. Between the coarse screen 2 and the fine screen 3,
A more compact structure is provided by providing one intake pipe 5 and one drain pipe 12 that joins the drainage from both screens 2 and 3.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A description will now be given based on the illustrated embodiment. FIG. 1 is a sectional view of an embodiment of a tandem type automatic strainer according to the present invention, and FIG. 2 is an overall side view.

The basic configuration of the embodiment is that a strainer case 1 is provided with a cylindrical coarse screen 2 and a fine screen 3 in series on the same rotary shaft 4, and water to be treated is supplied to the inside of the coarse screen 2. Connect the intake pipe 5,
A clean water chamber 6 is provided around the outside of the coarse screen 2 to filter the water to be treated to derive clean water, and the clean water chamber 6 is provided with a clean water supply pipe 7 and a diversion pipe 8 to divide the clean water. Water and connect the diversion pipe 8 to the inside of the fine screen 3, and a fresh water supply pipe 9 around the outside of the predicate fine screen 3.
A discharge valve 11 which is provided with a fresh water chamber 10 for discharging the fresh water, and a drain chamber 17 communicating with the insides of the screens 2 and 3 is provided between the screens 2 and 3 and is normally closed.
It is connected to the drainage pipe 12 provided with. The strainer of this structure continuously supplies clean water and fresh water, and at the time of cleaning, the control device rotates both screens 2 and 3 to open the discharge valve 11 to remove dust particles floating in both screens 2 and 3. The discharging operation can be automatically performed.

In the strainer body, a cylindrical coarse screen 2 forming a dust collecting chamber 14 and a cylindrical fine screen 3 forming a second dust collecting chamber 15 in a cylindrical strainer case 1 are vertically connected in series on the same rotating shaft 4. (Tandem
= Tandem). In the embodiment, the coarse screen 2 has a mesh shape having a diameter of 4, 5 to 5, 0 mm, and the fine screen 3 has a mesh shape having a diameter of 1 mm. The fine screen 3 can be designed so that the fineness of the fine screen 3 can be appropriately set according to the request for the degree of water purification. 0 depending on the quality of raw water,
It can also be designed to have a fine mesh of 2 to 3 mm. Further, in the embodiment, the dust collecting chamber 14 of the coarse screen 2 is set to have a capacity of about 6 times that of the dust collecting chamber 15 of the fine screen 3. However, the fineness of the mesh and the setting of the capacities of the dust collecting chambers 14 and 15 are designed according to the required amount and form of water in various power plants.

Water to be treated is introduced from the water intake pipe 5 into the inside of the coarse screen 2 (dust collecting chamber 14) and is filtered. The clean water filtered here is divided into water, a part of which is used as clean water, and a part of the clean water is introduced into the inside of the fine screen 3 (dust collection chamber 15) and filtered to be used as clean water. On the other hand, a drainage pipe 12 communicating with the insides of the both screens 2 and 3 is also connected for the purpose of discharging and cleaning dusts floating inside the both screens 2 and 3.

As a compact structure for taking in the water to be treated and discharging dust, a water intake chamber 16 connected to the external water intake pipe 5 is provided between the coarse screen 2 and the fine screen 3. A drainage chamber 17 is provided which is connected to an external drainage pipe 12 having a valve 11 and in which dust is once accumulated. The water intake chamber 16 is connected to the water intake 19 of the bottom plate 18 of the coarse screen 2. On the other hand, the drain chamber 17 is connected to both screens 2 and 3, that is, to the drain port 20 of the bottom plate 18 of the coarse screen 2 and the drain port 22 of the upper plate 21 of the fine screen 3.

A clean water chamber 6 formed by the inner wall of the strainer case 1 is provided around the outer side of the coarse screen 2. The clean water chamber 6 is provided with a clean water supply pipe 7 for supplying clean water to the outside, and the clean water chamber 6 is provided with a diversion pipe 8 for dividing a part of the clean water. The branch pipe 8 is connected to the inlet 23 of the upper plate 21 of the fine screen 3. The separated clean water is introduced inside the fine screen 3. And it is filtered here and becomes clear water. A fresh water chamber 10 formed by the inner wall of the strainer case 1 is provided around the outer side of the fine screen 3, and a fresh water supply pipe 9 is provided therein. The fresh water is used, for example, as fresh water for cooling the water wheel shaft sealing portion.

Coarse screen 2 and fine screen 3
Are provided in series on the same rotary shaft 4. Rotating shaft 4
Is connected to the motor 24 and rotates, but the dust collection chamber 1
A predetermined member such as a packing, a strainer metal, and a water sealing metal is attached so as to be water-tight with the fourth and second dust collecting chambers 15.

Although not shown in the figure, the control device, which is not shown, introduces the water to be treated and filters it to supply clean water, and further filters it to start the supply of clean water. Since the coarse screen 2 and the fine screen 3 are not usually clogged, they are used with the drain valve 11 closed. It should be noted that it is possible to supply water while rotating the coarse screen 2 and the fine screen 3 while rotating, supplying water in a stopped state, or supplying water while cleaning the both screens 2 and 3 by opening the drain valve 11. This is a design change mode.

Coarse screen 2 and fine screen 3
When cleaning dust on the inner surface of the, the controller opens the drain valve 11 to rotate the coarse screen 2 and the fine screen 3 in the reverse direction, or to change the intake amount and the intake speed together. Floating the dust, both screens 2-3
It automatically removes dust from the inner surface of the container and discharges it. In the case of automatic operation, it is possible to employ a configuration in which a timer periodically operates, or a configuration in which a pressure drop (clogging phenomenon) of supply cooling water is detected and used as an operation signal.

With such a configuration, the raw water from the intake pipe 5 is sent to the coarse screen 2 and the arrows A → B in the figure.
The clean water can be obtained from the clean water supply pipe 7 by the route of → C. In addition, arrows A → B → D → E → F → G →
Like the path of H, the clean water that has passed through the coarse screen 2 is divided by the flow dividing pipe 8 and introduced into the dust collecting chamber 15 inside the fine screen 3 to pass through the fine screen to obtain clean water. This clear water is used as cooling water for the water sealing device. When clean water and fresh water are being supplied, the drain valve 11 is normally closed and is not drained, so that all raw water from the intake pipe 5 is purified and supplied as clean water and / or fresh water. If a flow rate adjusting valve is provided at the branch point of the clean water supply pipe 7 or the flow dividing pipe 8, the amount of clean water and the amount of fresh water can be adjusted freely.

As described above, in order to remove and clean the dust accumulated or adhering to the dust collecting chambers 14 and 15, the drainage control device is operated while taking in water from the intake pipe 5.
The control device operates periodically or after detecting a drop in cooling water pressure after a certain period of time.
-Rotate 3 and operate to open drain valve 11. By the rotation of both screens 2 and 3, dust is separated from the inner walls of the screens 2 and 3 and floats in the water. The dust in the dust collecting chamber 14 of the coarse screen 2 flows down from the drainage port 20 into the drainage chamber 17, passes through the valve 11, and is discharged from the drainage pipe 12 as shown by a path of arrow I → L in the figure. Similarly, the dust in the dust collecting chamber 15 of the fine screen 3 is indicated by an arrow J in the figure.
Like the route of → K → L, the drainage chamber 17 is pushed upward by the hydraulic flow from the drainage port 22 of the upper plate 21 of the fine screen.
Are joined together and discharged from the drainage pipe 12.

Since the tandem type automatic strainer is controlled by the control device as described above and can automatically perform the dust discharge operation periodically and at the cooling water pressure drop, it is possible to supply purified water in two stages. Moreover, the cleaning and removing work is completely human-free. Further, no dust is sent out from the water supply pipes 7 and 9 during the cleaning and draining work.

[0022]

The present invention provides a coarse screen and a fine screen in the strainer case in a row with the same rotary shaft (tandem), and connects an intake pipe to the inside of the coarse screen to clean water around the coarse screen. A structure in which a clean water supply pipe and a diversion pipe are provided in the chamber, the diversion pipe is connected to the inside of a fine screen having a fresh water chamber having a fresh water supply pipe in the periphery, and both screens are connected to a drain pipe equipped with a valve. Is. As described above, the tandem type automatic strainer of the present invention can supply water of only two kinds of filtration and has a structure in which dust and wastewater is automatically controlled. effective. One strainer device can supply clean water and fresh water,
It can also supply cooling water for the new type of sealing equipment for hydropower plants. For cleaning the screen, the dust can be discharged automatically by opening the valve while rotating both screens by automatic control. Even if a large amount of dust flows into the river, such as when the river is flooded, the dust can be removed promptly and promptly. The signal to start cleaning is periodically sent by the control device or automatically by detecting the pressure drop of the cooling water, so that clean water and fresh water can be stably obtained. Conventionally, when fresh water was needed at a hydroelectric power plant, a secondary filtration device was installed in addition to the automatic strainer to obtain fresh water, but the strainer of the present invention has a function that integrates these, so there is also space for installation. Since it is small and can be controlled by the same degree of control as a conventional control device with a proven track record, it is highly reliable and a significant effect can be expected in terms of operation and maintenance. When newly introducing or repairing an automatic strainer, use a tandem type automatic strainer, and install a fine screen when fresh water such as sealed water or cooling water is needed in the future, so as to be proactive about future needs. It is possible to deal with it. Since the passages such as the diversion pipe, the water intake chamber, and the drainage chamber are provided in the body of the strainer case and between the coarse screen and the fine screen, the structure is compact and has no waste. As described above, the tandem type automatic strainer according to the present invention is a very practical and excellent device which has almost the same running cost and installation space as the subordinate strainer, and can supply clean water and fresh water at the same time. A tandem strainer with this configuration has not been put to practical use even when looking at hydroelectric power stations nationwide, and it can be expected as a strainer in the future.

[Brief description of drawings]

FIG. 1 is a partial sectional view showing an embodiment of a tandem type automatic strainer of the present invention.

FIG. 2 is a side view showing an embodiment of the tandem type automatic strainer of the present invention.

[Explanation of symbols]

 1 Strainer Case 2 Coarse Screen 3 Fine Screen 4 Rotating Shaft 5 Intake Pipe 6 Clean Water Chamber 7 Clean Water Supply Pipe 8 Dividing Pipe 9 Fresh Water Supply Pipe 10 Fresh Water Chamber 11 Drain Valve 12 Drain Pipe 14 Dust Collection Room 15 Dust Collection Room

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-48-82472 (JP, A) JP-A-50-146972 (JP, A) JP-B-63-63006 (JP, B2)

Claims (1)

(57) [Scope of utility model registration request] 1. A coarse screen 2 in a strainer case 1.
And provided fine screen 3 in series on the same rotation shaft 4, and supplies the water to be treated into the interior of the coarse screen 2
The intake pipe 5 is connected to the outer circumference of the coarse screen 2.
A clean water chamber 6 is provided in the surrounding area, and a clean water supply pipe 7 is provided in the clean water chamber 6.
And a diversion pipe 8 are provided to divert clean water, and the diversion pipe 8
To the inside of the fine screen 3
A clean water supply pipe 9 for deriving fresh water is provided around the outside of the clean water.
A water chamber 10 is provided, and both screens are placed between the screens 2 and 3.
A drainage chamber 17 that communicates with the inside of the leans 2 and 3 is provided at all times.
On the drain pipe 12 with the drain valve 11 closed
Connected, supply clean water and clean water and control during cleaning.
While rotating both screens 2 and 3 with the control device,
Open the lube 11 and discharge the dust particles floating in both screens.
Tandem type automatic operation characterized by automatic operation
Strainer .