JP2542173B2 - Flap open / close screen gate - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flap openable screen gate for opening and closing a water intake passage, and more particularly, to improve safety and workability of underwater work in the water intake passage, and to simplify maintenance and operation. The present invention relates to a flap openable screen gate.

[0002]

2. Description of the Related Art In nuclear power plants and thermal power plants, a large amount of cooling water is taken from the ocean and rivers, and foreign substances such as dust are removed by a bar screen during this water intake. A bar screen is a large number of bars that vertically cross the water flow in an intake channel and are arranged at predetermined intervals in the width direction of the water inlet. Foreign matter such as dust is caught on this bar to remove foreign matter from the cooling water. The dust caught on the bar screen is removed from the bar screen at any time by a device called a rotor relay.

This rotor relay is a sprocket arranged above and below a bar screen, a chain wound around these sprockets, and a large number of buckets fixed to this chain and scooping up foreign matter caught on the bar screen. It has and. In this regular repair work and permanent inspection work of the rotor relay, the foreign matter adhering to the rotor relay main body and its sides and bottom that are submerged are removed, and the rotor relay is removed and installed for overhaul, These works are underwater works by the diver.

However, the flow velocity of water at this intake is, for example, 3
It is a rapid current of about m / sec, which is a disadvantageous condition from the viewpoint of safety and workability, such as the diving eyeglasses being washed away and the body being swept away from work as desired. Therefore, in order to overcome this disadvantageous condition, prior to the present invention, a method was adopted in which a screen gate having a vinyl chloride sheet covered on the upstream side of the bar screen was hung by a crane to block the water flow.

[0005]

According to this prior art, the flow velocity at the water intake is set to a control reference value (1) for diving work of this type.
m / sec), which was much lower than 0.1 m / sec, for example, but the vinyl chloride sheet is likely to be damaged or broken when the screen gate is raised or lowered, and the vinyl chloride sheet must be replaced each time. It was found that there is a need, and when securing water flow during the work, the screen gate must be raised and lowered to remove the vinyl chloride sheet, which causes considerable trouble and time. .

In view of the above circumstances, the present invention provides a flap opening / closing type screen gate which is improved in safety and workability of underwater work at the water intake and is simple in maintenance and operation. The purpose is.

[0007]

In order to achieve the above-mentioned object, a flap opening / closing type screen gate according to the present invention has a large number of strip-plate-like flaps that are long in the width direction of an intake channel, and a large number of these flaps. With a predetermined pitch that is longer than the thickness and shorter than the plate width, in the order of a roller, and a chain means that is rotatably connected about a horizontal axis that is eccentric in the plate width direction of each flap, and this chain means. And a drive device that reciprocates each flap along an inverted U-shaped path to raise and lower the flap to and from the intake channel.

[0008]

Since each flap of the present invention is reciprocated along the path of the inverted U shape and is raised and lowered to the intake channel, the surface receiving the water flow depends on whether it is lowered upstream or downstream. Turns upside down. Each flap is shaped like a roller, and
Since it is connected to the chain means so as to be rotatable about the horizontal axis eccentric in the plate width direction, when the water flow is received on the front side of the flaps, for example, the water pressure drives the free ends of the flaps so that they overlap the adjacent flaps. Then, the gap between the flaps is closed and the water flow is blocked.

On the contrary, when a water flow is received on the back side of the flaps, the free end of each flap floats to the downstream side of the rotation axis due to the water pressure and the buoyancy received from the water flow, and the gap between the flaps is opened to allow water to flow. Is secured. Moreover, as compared with the prior art, it is possible to save the labor of remounting the vinyl chloride sheet and raising and lowering the screen gate by the crane for securing water flow during the work.

Further, since the flap is opened and closed by the water pressure of the intake water, it is not necessary to use special power to open and close the flap.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A flap opening / closing screen gate according to an embodiment of the present invention will be specifically described below with reference to the drawings. First, the principle of the flap opening / closing screen gate will be described with reference to FIGS. 1 and 2. I will explain. FIG.
As shown in FIG. 2 and FIG. 2, the flap opening / closing screen gate includes a number of strip-shaped flaps 2 that are long in the width direction of the intake channel 1, and a number of these flaps 2 that are longer than their plate thickness and wider than their plate width. At a short predetermined pitch, in the order of a roller,
Moreover, a chain means 3 that is rotatably connected about a horizontal axis that is eccentric to the plate width direction of each flap 2, and an inverted U-shape when viewed from the horizontal direction perpendicular to the water flow of each flap 2 via this chain means 3. And a drive device 4 that reciprocates along the path of (1) and raises and lowers the water intake path 1.

In order to prevent the flaps 2 and the chain means 3 from flowing into the water stream, the chain means 3 is composed of an endless chain, rope, belt or the like, and the drive means 4 is connected to the chain means. Wheels 5 and 6 such as a pair of upper and lower sprockets and pulleys around which 3 is wound are provided. Although not shown in FIGS. 1 and 2, the drive unit includes a wheel 5 such as a sprocket and a pulley.
A motor for driving each flap 2 and chain means 3 via 6 is provided.

Further, in order to prevent the flaps 2 and the chain means 3 from flowing into the water flow, the flaps 2 at both ends are prevented.
Alternatively, it is conceivable that a weight is hung on both ends of the chain means 3 having an end, or a spring is mounted on the both ends, but these methods reliably prevent the flaps 2 and the chain means 3 from flowing into the water stream. In addition to this, a strong driving force is required to reciprocally drive the flaps 2 and the chain means 3, which causes an increase in the size of the entire driving device 4 and an increase in power consumption, which is not preferable.

As shown in FIG. 1, when each flap 2 is submerged on the upstream side of water intake, a water flow hits the surface side of each flap 2, and the water pressure causes the free end of each flap 2 to the adjacent flap 2. Driven in the overlapping direction, the gap between the flaps 2 is closed and the water flow is blocked.
However, it is not necessary for each flap 2 to completely block the water flow, and it is sufficient to block the water flow to such an extent that the flow velocity on the downstream side becomes equal to or lower than the work control reference value.

As a result, the safety of underwater work such as removal of foreign substances and replacement of the rotor relay key 7 in the regular repair work and constant inspection work of the rotor relay key 7 arranged downstream of the flap opening / closing screen gate is improved. At the same time, the workability will be improved. Further, as shown in FIG. 2, when each flap 2 is submerged in the downstream side of the intake water, a water flow hits the back surface side of each flap 2, and the free end of each flap 2 rotates due to the water pressure and the buoyancy received from the water flow. It floats on the downstream side of the axis, and the gaps between the flaps 2 are opened to ensure water flow.

As described above, since the flap opening / closing screen gate is automatically opened / closed depending on whether each flap 2 is lowered to the upstream side or the downstream side of the water flow, complicated and skilled work such as crane operation is unnecessary. Therefore, the opening / closing operation is simplified, and the opening / closing operation can be performed in a short time. Further, it is not necessary to use a special power for opening / closing the flap 2, and energy saving can be achieved.

Further, since the vinyl chloride sheet is not used for damming the water flow, it is not necessary to replace the vinyl chloride sheet each time the screen gate is opened and closed, which simplifies maintenance and eliminates the cost thereof. It will be possible to switch between blocking and water flow in a short time. In this embodiment, the bar screen 8 is provided in the space surrounded by the inverted U-shaped movement path of each flap 2 in order to prevent foreign matters such as dust from being caught on each flap 2 when securing water flow. By omitting the bar screen 8, the flaps 2 are regularly or as needed.
May be sequentially pulled up to the water to remove the foreign matter caught on each flap 2.

Next, a specific structure of the flap opening / closing screen gate will be described with reference to FIGS. As shown in FIG. 3, the flap opening / closing type screen gate is of a double type and has two left and right sides in the frame 9.
A group of flaps 2 is arranged. This frame 9 includes vertical frames 10 on both left and right sides, an intermediate vertical frame 11, and these vertical frames 10 and 11.
The upper horizontal frame 12 that connects the upper ends of the
And a lower horizontal frame 13 connecting the lower ends of the.

The vertical frames 10 on both ends may be arranged so as to project into the water intake passage 1. However, in this embodiment, as shown in FIG. 4, in order to prevent the cross sectional area of the water intake passage 1 from being reduced. Both side surfaces 14 of the water intake passage 1 are fitted in a groove shape and arranged in the groove 15. Further, the lower horizontal frame 13 may be provided so as to project from the bottom 16 of the intake channel 1 into the intake channel 1. However, in this embodiment, since the flow passage cross-sectional area of the intake channel 1 is not reduced, 5
As shown in FIG. 3, the bottom 16 of the intake channel 1 is fitted in a groove shape and arranged in this groove 17.

A motor 18 of the drive unit 4 is provided on the upper horizontal frame 12.
A speed reducer 19 is mounted on the upper horizontal frame 12, and four upper sprocket 20 corresponding to the connecting cylinder 22 of the drive unit 4 of FIGS. It is rotatably supported around the axis. The sprockets 20 are connected by a connecting shaft 21 and a connecting drum 22 so as to rotate in synchronization with each other, and the connecting shaft 21 and the speed reducer 19 are connected together.
It is driven by the motor 18 via a transmission mechanism 23 and a speed reducer 19 provided over the.

In the lower horizontal frame 13, the lower four sprockets 24 corresponding to the wheels 6 of the drive unit 4 shown in FIGS. 1 and 2 corresponding to the upper four sprockets 20 flow into the water stream. The sprocket 24 is rotatably supported about a common horizontal axis at a right angle, and these sprockets 24 are connected by a connecting shaft 25 so as to rotate in synchronization with each other. Then, the chain means 3 made of a chain is wound around the sprocket 20 and 24 corresponding to the upper and lower sides. When the flap 2 is lowered to the upstream side from at least the portion to which the flap 2 is connected in the chain, the upper sprocket 20. As shown in FIG. 6, a link chain 26 that can handle a heavy load is formed over the portion that meshes with.

Each chain means 3 may be constructed by an endless link chain 26 as a whole, but in this case, the lower sprocket 24 must be formed to have a large diameter like the upper sprocket 20. The frame 9 becomes large in the water flow direction, and the groove width of the groove 15 on both side surfaces 14 of the intake channel 1 and the groove width of the groove 17 of the bottom 16 must be increased, which may increase the installation cost.

Therefore, in this embodiment, the link chain 26 is formed only from the portion where the flap 2 is attached to the portion that meshes with the upper sprocket 20 when the flap 2 is lowered to the upstream side, and as shown in FIG. Both ends of the link chain 26 are connected by a bushed chain 27 having a pitch smaller than that of the link chain 26, and the lower sprocket 24 meshing with the bushed chain 27 has a smaller diameter than the upper sprocket 20.

As a result, the frame 9 can be made smaller and lighter in the water flow direction, and both side surfaces of the intake channel 1 can be made.
The installation width can be reduced by reducing the groove widths of the groove 15 of 14 and the groove 17 of the bottom 16. It is not necessary to provide a guide for guiding the rotation of the chain means 3, but the tension of the chain means 3 becomes excessive due to the tension of the chain means 3 caused by the water pressure acting on each submerged flap 2. Then, there is a concern that the chain means 3 may be broken, but in this embodiment, as shown in FIG. 8 or FIG. Guide rails 28 and 29 are provided to guide movement.

The linking structure of the link chain 26 and the flaps 2 may be constructed so that the flaps 2 are rotatably connected about a horizontal axis eccentric in the plate width direction. In the example, as shown in FIGS. 8 and 9, a pin 30 is projected from one side edge portion in the flap width direction at both ends in the longitudinal direction of each flap 2, and the pin 30 is rotatably supported by the link chain 26. ing.

In this case, if no water pressure acts on each flap 2, the free end of each flap 2 hangs down by the weight of each flap 2 as shown in the lower right of the connecting cylinder 22 in FIG. While each flap 2 moves from the downstream side to the upstream side of the connecting cylinder 22 and moves to the upstream side, each flap 2 is inverted so that the free end of each flap 2 hangs downward due to the weight of each flap 2 even on the upstream side. However, in this case, the flaps 2 hit each other at the time of reversing to generate noise, and the flap 2 may be deformed. Moreover, it is necessary to provide a space for reversing the flap 2. There is also a problem that the upper horizontal frame 12 becomes large.

Therefore, in this embodiment, FIG. 6 and FIG.
As shown in FIG. 5, guides 31 for restricting the free ends of the flaps 2 from being separated from the connecting cylinder 22 by a certain amount or more are provided on the side surfaces of the both-end vertical frame 10 and the intermediate vertical frame 11, and the flaps 2 are connected from the downstream side. The flaps 2 are prevented from being turned over while moving around the upper side of the case 22 and moving to the upstream side, thereby preventing the generation of noise and the deformation of the flaps 2 and the upper horizontal frame 12
The miniaturization of

Further, as shown in FIGS. 8 and 9, by extending the front side wall of the guide rail 28 to the front side of both ends of each flap 2, each flap 2 lowered to the upstream side is linked to the link chain 26. On the other hand, a guide 28a is formed to prevent the flap 2 from being turned over, which prevents noise and deformation of the flap 2 due to the turning of the flap 2 and reduces the size of the flap openable screen gate in the water flow direction. ing.

As shown in FIG. 10, it is not essential to match the pitch of the link chain 26 with the mounting pitch of each flap 2, and the mounting of each flap 2 with respect to the pitch of the link chain 26. By increasing the pitch, the number of flaps 2 can be reduced, and by reducing the mounting pitch of each flap 2 relative to the pitch of the link chain 26, the area of each flap 2 can be reduced and the hydraulic pressure that each flap 2 bears. Can be reduced.

However, when the mounting pitch of each flap 2 is made larger than the pitch of the link chain 26, the space required for each flap 2 to move above the connecting cylinder 22 becomes large, and the upper horizontal frame This is disadvantageous in reducing the size of the valve 12, and is disadvantageous in that the water pressure that each flap 2 bears increases, so that it is necessary to form each flap 2 to be thick or to provide ribs for reinforcement. .

Further, when the mounting pitch of each flap 2 is made smaller than the pitch of the link chain 26, the number of flaps 2 increases, the number of parts increases, and the structure becomes complicated, which is disadvantageous. Become. Therefore, in this embodiment, the pitch of the link chains 26 and the mounting pitch of the flaps 2 are made equal to each other to reduce the size of the upper horizontal frame 12, and
The number of parts is reduced, the structure is simplified, and the shape of each flap 2 is simplified, thereby significantly reducing the cost.

Further, in this embodiment, as shown in FIGS. 8 and 9, the pins 30 provided at both longitudinal ends of each flap 2 are also used as the connecting pins of the link chain 26 to further reduce the number of parts. This further simplifies the configuration and reduces the cost. The bar screen 8 provided on the flap opening / closing type screen gate is provided between the upstream rotation path portion and the downstream rotation path portion of each flap 2, and has left and right vertical frames 10 and an intermediate vertical frame 11. And the horizontal rails 8a fixed in the upper and lower multi-stages and the horizontal rails 8a.
The flat bar 8b is fixed between the a and the a in the width direction of the water intake passage so as to vertically cross the water flow at a predetermined pitch.

The pitch of the flat bar 8b is not particularly limited and can be made larger than the mounting pitch of each flap 2, but here, the foreign matter is caught on each flap 2 lowered to the downstream side. In order to prevent it, it is made smaller than the mounting pitch of each flap 2. By operating the driving means 4, the flaps 2 that are lowered to the upstream side have their free ends covered from the upstream side to the lower ends of the upper flaps 2 as shown in FIGS. 10 and 11. As it is submerged in order, under water, as shown in FIG. 11, each free end is pressed by the lower end of the upper flap 2 under the pressure of the water flow to close the space between the upper flap 2 and the free end. .

As a result, the water flow is blocked,
The flow velocity on the downstream side of each flap 2 is reduced to a low speed equal to or lower than the control reference value, and the safety and workability of underwater work on the downstream side of the flap opening / closing screen gate are enhanced. Further, as shown in FIG. 10, the flaps 2 that are lowered to the downstream side by operating the driving means 4 in reverse are
The free end is submerged in order with the free end hanging downward, and in water, the free end floats so that the free end flows downstream due to the pressure of the water flow and the buoyancy generated by the water flow, and the space between the flap 2 below Opened, which makes intake channel 1
Water flow is secured.

In addition, since the flap opening / closing screen gate can be opened and closed by a simple operation of switching the rotation direction of the motor 18, the operation is simple, and the vinyl chloride sheet need not be replaced.
Easy maintenance. In the above embodiment, the water flow is blocked when the flap 2 is lowered to the upstream side, but the water flow is blocked when the flap 2 is lowered to the downstream side and opened when the flap 2 is lowered to the upstream side. You may do it.

Further, in the above-described embodiment, the chain means 3 is connected to both ends of the flap 2 of the group 1, but the middle portion of the flap 2 of the group 1 has an appropriate interval in the direction of the rotational axis of the flap 2. A plurality of chain means 3 may be connected with each other, or the central portions of the flaps 2 in the group in the axial direction of the flap rotation axis may be connected by one chain means 3.

[0037]

As described above, according to the present invention, a large number of strip plate-like flaps that are long in the width direction of the intake channel and a predetermined number of these flaps that are longer than their plate thickness and shorter than their plate width are provided. Chain means for rotatably connecting the flaps in the order of a roller and around a horizontal axis eccentric in the plate width direction of each flap, and via the chain means each flap along an inverted U-shaped path. And a drive device that reciprocates to raise and lower the intake channel.

By operating this drive means to switch the direction of lowering each flap between the upstream side and the downstream side, it is possible to open / close each flap submerged by the pressure of the water flow and close each flap. Thus, the water flow in the intake channel can be blocked, and the flow velocity on the downstream side can be made lower than the predetermined control reference value, and the safety and workability of the underwater work on the downstream side can be reliably improved.

Further, since the flaps submerged in water can be opened and closed by a simple operation of switching the driving direction of the drive means, the operation is simple and the flaps can be opened and closed without using special power, thereby saving energy. It is advantageous above. Further, since the work of refilling the vinyl chloride sheet is not required, the maintenance is simplified, the cost can be reduced, and the switching between the dam and the water flow can be performed in a short time.

In the present invention, particularly when a guide for preventing the flaps from being inverted with respect to the chain means is provided, noise and deformation of the flap 2 due to the inversion of the flap 2 are prevented. , The flap openable screen gate can be made smaller in the water flow direction. Further, in the present invention, in particular, the chain means comprises a link chain connecting the flaps and a bushed chain or a rope connecting both ends of the link chain, and the drive device includes a sprocket around which the link chain is wound, and a bushed chain. Or, if you have a sprocket or pulley around which the rope is wound, ensure that the flap that receives water pressure is supported by a strong link chain, and wrap the sprocket or pulley around which the bushed chain or rope is wrapped around the link chain. By making the diameter of the screen gate smaller than the sprocket, the flap opening / closing screen gate can be made smaller and lighter in the water flow direction.

[Brief description of drawings]

FIG. 1 is a principle diagram of the present invention when blocking a water flow weir.

FIG. 2 is a principle diagram of the present invention when securing water flow.

FIG. 3 is a front view of the present invention.

FIG. 4 is a plan view of the present invention.

FIG. 5 is a vertical side view of the present invention.

FIG. 6 is a vertical sectional side view of a main part of the present invention.

FIG. 7 is a vertical cross-sectional side view of another main part of the present invention.

FIG. 8 is a cross-sectional plan view of an essential part of the present invention.

FIG. 9 is a cross-sectional plan view of another main part of the present invention.

FIG. 10 is a diagram for explaining the operation of the flap of the present invention.

FIG. 11 is an explanatory diagram of the operation of the flap of the present invention.

[Explanation of symbols]

 1 ... Intake channel 2 ... Flap 3 ... Chain means 4 ... Drive device 20 ... Sprocket 24 ... Sprocket 26 ... Link chain 27 ... Bushed chain 28a ・ 31 ... Guide

Claims (3)

(57) [Claims] 1. A large number of strip-shaped flaps that are long in the width direction of the intake channel, and a large number of these flaps that are longer than their thickness and have a predetermined pitch that is shorter than their width, in the order of rollers, and Chain means that rotatably connects about a horizontal axis that is eccentric in the plate width direction of each flap, and a drive device that reciprocates each flap along an inverted U-shaped path through the chain means to raise and lower the intake channel. And a flap-opening type screen gate, which is provided with. 2. The flap opening / closing screen gate according to claim 1, further comprising a guide for preventing the flaps from being inverted with respect to the chain means. 3. The chain means comprises a link chain for connecting the flaps and a bushed chain, a rope or a belt for connecting both ends of the link chain, and the sprocket on which the drive device winds the link chain, and the bushed chain. The flap opening / closing screen gate according to claim 1 or 2, further comprising a sprocket or a pulley around which a rope is wound.