JP2001141077A - Flap valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a flap valve capable of opening a valve element slightly to discharge water securely even if an amount of flowing water is small at normal time and being speedily closed when a water level on a water discharge tip side rises. SOLUTION: This flap valve has a valve casing 16 connected with a gutter pipe 11, a flap valve element 20 opening and closing a water drain port 19 of the valve casing 16, a support member supporting the flap valve element 20 so as to oscillate freely around a valve bar 21, and a counterweight 24 energizing the flap valve element 20 in the direction of opening. Moment M2 in the direction of opening acts on the flap valve element 20 due to self-weight of the counterweight 24, and moment M1 in the direction of closing acts on the flap valve element 20 due to self-weight of the flap valve element 20. When a water level A of a river 12 rises, the moment M2 in the direction of opening is reduced due to buoyancy acting on the counterweight 24 to close the flap valve element 20.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flap valve mounted on a drainage pipe such as a river gutter, and more particularly to a flap valve provided with a counterweight for assisting an opening and closing operation of a valve body.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 7, in order to discharge water from a land side or a wastewater treatment plant to a river 1, a gutter pipe 3 is disposed through a dike 2 and a tip end of the gutter pipe 3 is provided. The flap valve 4 is installed. The valve element 5 of the flap valve 4 is configured to open by receiving a water flow flowing through the inside of the gutter pipe 3, and to close using the own weight of the valve element 5.

[0003]

However, in the above-mentioned conventional type, when the water flow flowing in the gutter tube 3 is small,
It is difficult to open the valve body 5 against its own weight, and there is a possibility that the flow in the gutter tube 3 is obstructed. The present invention
It is an object of the present invention to provide a flap valve that can be opened by slightly opening a valve body even in a small amount of flowing water to reliably drain the water at a normal time, and can be quickly closed when the water level at the drain destination rises. And

[0004]

In order to solve the above problems, a flap valve according to the first aspect of the present invention comprises a valve box connected to a drain pipe and a flap valve body for opening and closing a drain port of the valve box. A support portion for swingably supporting the flap valve body around a horizontal support shaft, and a counterweight for urging the flap valve body in an opening direction, wherein the flap valve body is weighed by the weight of the counterweight. The moment in the opening direction acts on the flap valve body, and the moment in the closing direction acts on the flap valve body due to the weight of the flap valve body. Is decreased, and the moment in the opening direction is increased due to a decrease in buoyancy acting on the counterweight when the water level on the drainage side is lowered.

According to this, the flap valve body is normally urged in the opening direction by the weight of the counterweight, so that the moment in the opening direction is greater than the moment in the closing direction. The body opens slightly. Therefore, even if the amount of flowing water is small, the water is surely drained from the drain outlet to the drain destination. If the water level on the drainage side rises higher than normal, buoyancy acts on the counterweight, and the moment in the opening direction is smaller than the moment in the closing direction. The mouth is closed automatically. This can prevent the water on the drainage side from flowing backward and flowing into the drainage pipe from the flap valve.

Thereafter, when the water level on the drainage side falls and returns to normal, the buoyancy acting on the counterweight decreases, and the moment in the opening direction becomes larger than the moment in the closing direction. Open. Further, in the flap valve according to the second aspect of the invention, the counterweight rises from a predetermined position due to a decrease in the opening moment, the flap valve body closes, and the counterweight descends to a predetermined position due to an increase in the opening moment. The flap valve is opened by a predetermined angle.

According to this, when the water level on the drainage side rises higher than usual, buoyancy acts on the counterweight, and the moment in the opening direction is smaller than the moment in the closing direction. At this time, the counterweight rises from a predetermined position due to a decrease in the moment in the opening direction. Further, when the water level on the drainage side drops, the buoyancy acting on the counterweight decreases, and the moment in the opening direction is greater than the moment in the closing direction, so that the flap valve quickly opens and opens a predetermined angle, At this time, the counterweight descends to a predetermined position and is held by the holding member. Thereby, even if the amount of flowing water is small, the water is surely drained from the drain port to the drain destination.

Further, the flap valve according to the third aspect of the present invention
The flap valve body is mounted on a horizontal support shaft, and the horizontal support shaft is rotatably supported by a support portion provided on the valve box. One end of an arm is mounted on the horizontal support shaft, and a counterweight is connected to a counterweight. The lower end is connected, the other end of the arm and the upper end of the link are connected via a connecting pin, and the connecting pin is inserted into a vertically long hole formed at the upper end of the link. In the state where the counterweight is lowered to a predetermined position and held by the holding member, the flap valve body is moved according to the moving range within the long hole of the connecting pin. , Can be opened at a predetermined angle or more.

According to this, normally, the flap valve is opened at a predetermined angle by lowering the counterweight to a predetermined position and holding it by the holding member. When the amount of flowing water in the drainage pipe increases, the flap valve receives the water flow flowing in the drainage pipe, so that the moment in the opening direction increases, and the flap valve tends to further open. At this time, the horizontal support shaft rotates, the arm swings, and the connecting pin moves in the elongated hole, so that the flap valve body is not restricted (fixed) to a predetermined angle, and the amount of flowing water increases. It opens more than a predetermined angle accordingly.

At this time, the counterweight is still held at the predetermined position by the holding member. Even if the counterweight does not further move down from the predetermined position, the connection pin moves in the elongated hole, The flap valve opens more than a predetermined angle. Therefore, the space required for the vertical movement of the counterweight can be reduced in the vertical direction.

Further, the flap valve according to the fourth aspect of the present invention includes:
The valve box is provided with a switchgear for forcibly opening and closing the flap valve element. According to this, in an emergency, etc., regardless of the amount of water flowing in the drain pipe and the water level on the drain side,
The flap valve body can be forcibly opened and closed using the switch. Also, since the switchgear is provided in the valve box, even if the drainage pipe sinks in the ground, the switchgear is displaced downward integrally with the valve box, so the mounting position of the switchgear with respect to the valve box may be incorrect. There is no.

Further, the flap valve according to the fifth aspect of the present invention includes:
When the flap valve body is forcibly opened by the opening / closing device, the counterweight descends to a predetermined position and is held by the holding member, and further, the connecting pin moves in the elongated hole, and the flap valve body moves beyond the predetermined angle. It is fully opened at a large angle. According to this, when the flap valve body is forcibly opened by the switch, the flap valve body is fully opened at an angle larger than the predetermined angle. At this time, the counterweight is still held at the predetermined position by the holding member, and even if the counterweight does not further move down from the predetermined position, the connecting pin moves in the elongated hole, and the flap valve body is moved. Fully open at an angle larger than the predetermined angle. Therefore, the space required for the vertical movement of the counterweight can be reduced in the vertical direction.

[0013]

FIG. 1 is a block diagram showing an embodiment of the present invention.
This will be described with reference to FIG. As shown in FIG.
1 (an example of a drainage pipe) is provided to penetrate the embankment 13 in order to drain water from a land side or a wastewater treatment plant to a river 12 at a drainage destination. A flap valve 15 is attached to the tip of the gutter tube 11. The flap valve 15 is opened at the time of drainage, and is closed at the time of increasing the river 12 to prevent the backflow of the river water.

The construction of the flap valve 15 will be described below. As shown in FIGS. 1 and 2, the valve box 16 of the flap valve 15 is connected to the tip of the gutter pipe 11, and is attached and fixed to a floor 18 (an example of a holding member) via a leg 17. I have. A flap valve 20 for opening and closing the drain port 19 is attached to the valve box 16 via a valve rod 21 (an example of a horizontal support shaft). That is, the valve stem 21 is horizontally inserted into a pair of left and right cylindrical support members 22 (an example of a support portion) provided on the upper part of the valve box 16 and is rotatably supported. The upper part of the flap valve body 20 is attached to the central part of the valve stem 21, whereby the flap valve body 20 is swingably supported around the valve stem 21.

A pair of left and right counterweights 24 for urging the flap valve body 20 in the opening direction are provided at both ends of the valve stem 21 via link mechanisms 23, respectively. Each of the counterweights 24 has a float portion 25 having a hollow structure and a weight portion 2 for adjusting the weight.
6. The left and right link mechanisms 2
3 is an arm 28, a link 29 and an upper connecting pin 3 respectively.
0 and a lower connecting pin 31. One end of the arm 28 is attached to an end of the valve stem 21. The lower end of the link 29 is rotatably connected to the counterweight 24 via a lower connecting pin 31. Further, the other end of the arm 28 is connected to the inlet 3 of the valve box 16.
5 and the other end of the arm 28 and the link 29
Is rotatably connected to the upper end via an upper connecting pin 30. An elongated hole 32 in the vertical direction is formed at the upper end of the link 29. The upper connecting pin 30
Is inserted into the elongated hole 32 and is configured to be vertically movable along the elongated hole 32.

A hydraulic cylinder device 36 forcibly opening and closing the flap valve element 20 is provided above the valve box 16.
(An example of a switchgear) is provided. The tip of the piston rod 37 of the cylinder device 36 is
8, it is connected to the valve stem 21. One end of the opening / closing arm 38 is attached to the valve rod 21, and the other end is connected to the tip of the piston rod 37 via a connecting pin 39. At the other end of the opening / closing arm 38, an arc-shaped long hole 40 long in the front-rear direction is formed. The connection pin 39 is inserted into the elongated hole 40 and is configured to be movable back and forth along the elongated hole 40.

As shown in FIG. 6, the operation room 41 installed on the embankment 13 has the cylinder device 3
A manual pump 42 for reciprocating the piston rod 37 of No. 6 is installed. Further, the periphery of the drain port 19 of the flap valve 15 is covered with a grid-like screen 43. The screen 43 can prevent a problem that dust or the like from the river 12 enters the inside of the flap valve 15 or bites between the flap valve body 20 and the valve box 16.

The operation of the above configuration will be described below. As shown in FIG. 3, the valve stem 2 of the flap valve body 20
In the vicinity of 1, a closing moment M1 for closing the flap valve 20 (swinging in the closing direction) and an opening moment for opening the flap valve 20 (swinging in the opening direction) M2 acts. When M1> M2, the flap valve body 20 swings in the closing direction, and when M1 <M2, the flap valve body 20 swings in the opening direction.

The closing moment M1 is generated by the weight of the flap valve body 20 and changes as the horizontal distance between the center of gravity of the flap valve body 20 and the valve rod 21 changes according to the opening. Each degree is constant. The opening moment M2 is generated by the weight of the counterweight 24, and increases as the weight of the counterweight 24 increases.

At normal times, as shown in FIG. 3, the water level A of the river 12 is lower than the upper surface 18a (corresponding to a predetermined position) of the floor 18 and M1 <M2, so that the flap valve 20 is opened. , Slightly open by a predetermined angle α. That is, the two counterweights 24 move the upper surface 1 of the floor 18 by their own weight.
8a, and is held by the floor 18. At this time, the upper connecting pin 30 is located at the upper end of the elongated hole 32 and the link 29
Is pulled down by the counterweight 24, the other end of the arm 28 swings downward, whereby the valve stem 21 rotates to one side and the flap valve body 20 opens. Then, when the counterweight 24 is lowered to the upper surface 18a of the floor portion 18, the opening movement of the flap valve body 20 stops.

As described above, since the flap valve element 20 is slightly opened by the predetermined angle α, even when the amount of flowing water in the gutter tube 11 is small, the water flow B in the gutter tube 11 is surely discharged to the drain port 19. From the river to the river 12. Also, in this state,
When the amount of flowing water in the gutter tube 11 increases, as shown in FIG. 4, the flap valve body 20 is pushed by receiving the water flow B flowing in the gutter tube 11, so that the opening direction moment M2 increases and the flap valve The body 20 is about to open further from the predetermined angle α. At this time, the valve stem 21 further rotates to one side,
The other end of the arm 28 further swings downward, and the upper connecting pin 30 moves from the upper end in the elongated hole 32 to the lower part. For this reason, the flap valve body 20 is opened or moved to the predetermined angle α or more in accordance with the increase in the amount of flowing water in the gutter 11 without being restricted (fixed) to the predetermined angle α. Thereby, even if the amount of flowing water in the gutter 11 increases, the gutter 11
The internal water flow B can be sufficiently drained from the flap valve 15 to the river 12.

At this time, the counterweight 24 is attached to the floor 1
8, the upper connecting pin 30 moves from the upper end to the lower part in the long hole 32 even if the counterweight 24 does not further descend from the upper surface 18a of the floor portion 18. The above-mentioned flap valve element 2
0 opens more than a predetermined angle α. Therefore, the space S (see FIG. 1) required for the vertical movement of the counterweight 24 can be reduced in the vertical direction.

Further, as shown in FIG. 1, when the water level A of the river 12 rises above the upper surface 18a of the floor 18 due to rainfall or the like, the river water 44 causes the two counterweights 2 to flow.
4, the self-weight of the counterweight 24 is reduced by the amount of the buoyancy F.
2 decreases, and M1> M2. Therefore, the flap valve body 20 closes quickly, and the drain port 19 is automatically closed. At this time, the valve stem 21 rotates to the other side, and the other end of the arm 28 swings upward, whereby the link 29 is pulled up and the counterweight 24 is moved to the upper surface 1 of the floor 18.
It rises from 8a.

In this manner, since the flap valve body 20 is closed, it is possible to prevent the river water 44 of the river 12 from flowing backward and flowing from the flap valve 15 into the gutter 11. Thereafter, when the water level A of the river 12 falls, the buoyancy F acting on the counterweight 24 decreases,
As the opening moment M2 increases and M1 <M2, as shown in FIG.
Is lowered to the upper surface 18a of the floor portion 18 and is held, and the flap valve body 20 opens and opens by a predetermined angle α.

When the flap valve 20 is opened and closed as described above, the connecting pin 39 is inserted into the long hole 40 of the opening and closing arm 38.
Is inserted, the opening / closing arm 38 can swing over the range of the long hole 40 even if the piston rod 37 of the cylinder device 36 is fixed, so that the flap valve body 20 is not restrained. It is opened and closed. Also,
In an emergency or the like, the cylinder device 36 can be operated to forcibly open and close the flap valve body 20 irrespective of the amount of water flowing in the gutter 11 or the water level A of the river 12. That is, by operating the manual pump 42 to retract the piston rod 37 as shown in FIG. 5, the connecting pin 39 is connected to one end of the elongated hole 40 of the opening / closing arm 38 (that is, the end on the inlet 35 side). ), The valve stem 21 rotates to one side together with the opening / closing arm 38, the other end of the arm 28 swings downward, the link 29 descends, and both counterweights 2 move.
4 is held on the upper surface 18 a of the floor 18. Then, the valve stem 21 further rotates to one side, and the other end of the arm 28 further swings downward, whereby the upper connecting pin 30 moves from the upper end to the lower end in the elongated hole 32, , The flap valve body 20 is fully opened at an angle larger than the predetermined angle α.

At this time, the counterweight 24 is attached to the floor 1
8, the upper connecting pin 30 moves from the upper end to the lower end in the elongated hole 32 without the counterweight 24 further descending from the upper surface 18a of the floor portion 18. Thereby, the flap valve body 20 is fully opened at an angle larger than the predetermined angle α. Therefore, the space S (see FIG. 1) required for the vertical movement of the counterweight 24 can be reduced in the vertical direction.

When the flap valve 20 is forcibly closed, the piston rod 37 is made to protrude, so that the reverse operation of the above-described case of opening is performed. Further, since the cylinder device 36 is provided in the valve box 16,
Even if the gutter tube 11 sinks in the ground, the cylinder device 36 is displaced downward integrally with the valve box 16, so that the mounting position of the cylinder device 36 with respect to the valve box 16 does not change.

In the above embodiment, as shown in FIG.
Since a pair of counterweights 24 are provided at both ends of the valve stem 21 via the link mechanism 23, a balance can be obtained on both left and right sides of the flap valve body 20. However,
If the balance is not hindered, a counterweight 24 may be provided at only one end of the valve stem 21 via the link mechanism 23.

In the above embodiment, the water is drained from the flap valve 4 to the river 12, which is the drainage destination, but may be drained to the sea or lake.

[0030]

As described above, according to the present invention, the flap valve is normally urged in the opening direction by the weight of the counterweight, so that the moment in the opening direction is larger than the moment in the closing direction. And the flap valve body slightly opens. Therefore, even if the amount of flowing water is small, the water is surely drained from the drain outlet to the drain destination.

When the water level on the drain side rises higher than usual, buoyancy acts on the counterweight, and the moment in the opening direction is smaller than the moment in the closing direction, so that the flap valve body closes quickly. And the drain is closed automatically. This can prevent the water on the drainage side from flowing backward and flowing into the drainage pipe from the flap valve.

Thereafter, when the water level on the drainage side falls and returns to normal, the buoyancy acting on the counterweight decreases, and the moment in the opening direction becomes larger than the moment in the closing direction. Open.

[Brief description of the drawings]

FIG. 1 is a side view of a flap valve according to an embodiment of the present invention, showing a state where a flap valve body is closed.

FIG. 2 is a front view of the same flap valve.

FIG. 3 is a side view of the flap valve, showing a state where the flap valve is slightly opened by a predetermined angle.

FIG. 4 is a side view of the flap valve, showing a state where the flap valve body is opened at a predetermined angle or more.

FIG. 5 is a side view of the flap valve, showing a state where the flap valve body is forcibly fully opened by a cylinder device.

FIG. 6 is a diagram showing the flap valve and its periphery.

FIG. 7 is a diagram showing a conventional flap valve and its periphery.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Gutter pipe (drain pipe) 12 River (drainage destination) 15 Flap valve 16 Valve box 18 Floor (holding member) 18a Upper surface (predetermined position) 19 Drain outlet 20 Flap valve 21 Valve stem (horizontal support shaft) 22 Support member (Supporting part) 24 Counterweight 28 Arm 29 Link 30 Upper connecting pin 32 Slot 36 Cylinder device (switch) A Water level F Buoyancy M1 Moment in closing direction M2 Moment in opening direction α Predetermined angle

Claims (5)

[Claims] Claims 1. A valve box connected to a drain pipe and disposed, a flap valve element for opening and closing a drain port of the valve box, and a support part for swingably supporting the flap valve element about a horizontal support shaft. A counterweight for urging the flap valve body in the opening direction, a moment in the opening direction acting on the flap valve body by the weight of the counterweight, and a flap valve body by the weight of the flap valve body. The moment in the closing direction acts on the counterweight, and when the water level on the drainage side rises, the buoyancy acting on the counterweight reduces the moment in the opening direction.When the water level on the drainage side decreases, the buoyancy acting on the counterweight decreases. A flap valve, wherein the moment in the opening direction increases. 2. The counterweight rises from a predetermined position due to a decrease in the moment in the opening direction, the flap valve body closes, and the counterweight descends to a predetermined position due to an increase in the moment in the opening direction and is held by the holding member. 2. The flap valve according to claim 1, wherein the flap valve is opened at a predetermined angle. 3. The flap valve body is attached to a horizontal support shaft,
The horizontal support shaft is rotatably supported by a support portion provided on the valve box, one end of an arm is attached to the horizontal support shaft, the lower end of the link is connected to the counterweight, and the other end of the arm is connected to the counterweight. The upper end of the link is connected to the upper end of the link via a connecting pin, and the connecting pin is inserted into a vertically elongated hole formed at the upper end of the link, and is configured to be vertically movable along the elongated hole. In the state where the counterweight is lowered to the predetermined position and held by the holding member, the flap valve is configured to be able to open at a predetermined angle or more in accordance with the moving range within the long hole of the connection pin. The flap valve according to claim 2, wherein 4. The flap valve according to claim 3, wherein the valve box is provided with a switch for forcibly opening and closing the flap valve body. 5. When the flap valve body is forcibly opened by the switch, the counterweight descends to a predetermined position and is held by the holding member, and further, the connecting pin moves in the elongated hole, and the flap valve body moves. The flap valve according to claim 4, wherein the valve is fully opened at an angle larger than a predetermined angle.