JP2004169408A - Downstream water level controller - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a downstream water level controller stably working in a preset water level range. <P>SOLUTION: A door body is installed in a watercourse. A float 2 moving in conjunction with the door body is installed in a room 5 formed in the watercourse side. A hydrostatic pond 23 is provided in the upstream of a float room 5 and an upper limit water level detecting tube 26 into which the upstream water flows in and lower limit water level detecting tube 27 are arranged. A retarding pond 24 is made in the downstream of the float room 5 and a detection float 21 detecting the downstream water level is housed therein. The lower part of the lower limit water level detecting tube 27 is extended, U-turned in the retarding pond 24, and opened in the float room 5. A valve body 20 integrally built in the lower part of the detection float 21 is assembled in the inside 28 projected to the retarding pond 24 of the lower limit water level detection tube 27. The valve body 20 is closed in the case that the detection float 21 is higher than a preset water level. Water volume flowing in the float room 5 in compliance with the fluctuation of the downstream water level is adjusted in the upper and lower limit water level. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
TECHNICAL FIELD The present invention relates to a downstream water level control device provided across a water channel to regulate flowing water.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, as one of the gates provided in a waterway, a tender gate 1 shown in FIGS. 2 and 3 is assembled so as to raise and lower a door body 3 in conjunction with the operation of a float 2. The tender gate 1 bypasses the water flowing upstream of the door body 3 through the pit 4 provided on the side of the water channel, and balances the float 2 of the float chamber 5 formed in the pit 4 to determine the position of the door body 3. ing. Water on the upstream side above the set water level flows into the float chamber 5 to float the float 2.
Therefore, the amount of inflow into the float chamber 5 changes due to the fluctuation of the upstream water level, and the float 2 rises or descends, and the upstream water level is maintained substantially constant by raising and lowering the door 3 linked to the float 2. When the upstream water level falls below the set water level, water is not supplied to the float chamber 5, so that the float 2 falls and the door 3 closes the water channel.
[0003]
In the gate 1 shown in FIG. 4, a door 3 and a counterweight 8 are distributed to a main shaft 6 crossing a water channel via an arm 7 extending in the upstream and downstream directions. The main shaft 6 extends to the pit 4 provided on the side of the water channel, and is provided with a guide arm 9 projecting upstream. The guide arm 9 is connected to a vertical arm 10 fixed to the upper surface of the float 2, so that the door 3 and the float 2 operate in the same direction.
The pit 4 is partitioned into a still water pond 11, a float chamber 5, and a retarding pond 12 in order from the left side in the figure. An inflow port 13 and an outflow port 14 are formed on the side wall facing the water channel of the still water pond 11 and the idle water pond 12, and communicate with the water channel on the upstream side and the water channel on the downstream side with respect to the door body 3, respectively.
[0004]
The float 2 accommodated in the float chamber 5 has a water guide chamber 2a at the upper part, a closed chamber 2b at the lower part, and a hole as a ventilation device formed in the upper surface. The connecting portion of the water guide chamber 2a of the float 2 is provided on the lower surface of the float 2, and one end of a flexible communication pipe 15 is attached thereto. The other end of the communication pipe 15 opens upward in the retarding basin 12 at a position below the riverbed of the waterway.
[0005]
A water level detecting float 16 is accommodated in the retarding basin 12, and a valve element 18 for opening and closing a drain port 17 protruding from the float chamber 5 is connected to the drain port 17. The structure is such that even if the valve element 18 is closed, it flows out of the drain port 17 slightly.
[0006]
A large gear 20 is mounted on the main shaft 6 and is connected to a small gear 21. A projection 22 is fixed to the small gear 21, and the projection 22 is connected to the water level detection float 16 via a spring 23. The water level detection float 16 is stationary in a state where buoyancy and spring force are balanced. The still water pond 11 is provided with a water inlet 24 and a water inlet 25 which are open upward, and are respectively connected to the float chamber 5. The upper ends of the openings of the water inlet 24 and the water inlet 25 are adjustable, and the adjustment points are suspended and connected to the protrusions 22 fixed to the small gear 21 described above.
[0007]
Generally, in a downstream area where water in a water channel is used, a downstream gate and a diversion work immediately before the downstream gate are provided. Therefore, when the amount of water used increases in the downstream area of the gate 1 configured as described above, the water surface of the water channel between the gate 1 and the downstream gate drops.
When the water level downstream of the gate 1 falls, first, the water level detection float 16 descends and the drain port 17 is closed. Thereby, the water level of the float chamber 5 rises, and the float 2 rises. Then, the door body 3 rises to increase the amount of water supplied downstream. When the amount of water used in the downstream area decreases and the downstream water level rises, the water level detection float 16 rises and the drain port 17 is opened, and as a result, the door body 3 descends and the water flowing downstream flows. Decrease.
[0008]
[Problems to be solved by the invention]
By the way, when the water level detection float 16 descends, the flow of water to the downstream is increased. However, when the gate 1 is operated so that the water level between the downstream side gate and the diversion works immediately becomes the set water level, the gate 1 The opening is too large and is affected by backwater (backwater). In addition, the open state of the drain port 17 is adjusted in accordance with the degree of opening of the door 3 based on the relationship between the gate 1 and the downstream gate.
In addition, in order to make the water distribution service of the water diversion work useful, the upper limit water level of the gate 1 is determined by the water inlet 24 and the lower limit water level is determined by the water supply port 25.
Therefore, since the adjusting mechanism of the water level detection float 16 and the spring 23 and the adjusting mechanism of the water inlet 24 and the water inlet 25 are mounted, the assembling work of the apparatus is complicated. Further, the adjustment work requires labor.
[0009]
An object of the present invention is to provide a downstream water level control device that has a simple structure and operates stably in a set water level width region.
[0010]
[Means for Solving the Problems]
In order to achieve the above object, according to the present invention, a door is provided on a main shaft crossing a waterway, and a float in a float chamber provided on a side of the waterway is moved in the same direction as a lifting operation. A water reservoir is provided on the upstream side of the float chamber and communicates with a water channel on the upstream side of the door body, and a retarding reservoir is provided on the downstream side of the float chamber and communicates with a water channel on the downstream side of the door body. A downstream water level control device that communicates the float chamber and the retarding pond via an outlet,
In the still water pond, an upper end water level detection tube is provided in which an opening at one end is adjustable in height and the other end is opened to the float chamber,
A lower limit water level detection pipe is provided at the lower position of the still water pond at a position lower than the upper limit water level detection pipe so that the opening at one end is adjustable in height. Open in the float chamber,
A detection float for detecting the downstream water level is disposed in the retarding pond, and a valve body is integrally provided below the detecting float, and the valve body is disposed inside a portion of the lower limit water level detecting pipe that protrudes into the retarding pond. It is characterized in that it is provided so as to close above the set water level of the detection float.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
At the gate provided in the waterway, a door is provided on a main shaft crossing the waterway, and a counterweight is further attached.
As shown in FIG. 1A, a float 2 that operates in the same direction as a door (not shown) fixed to a main shaft 6 is housed in a float chamber 5 in a pit 4 on the side of the water channel. Although not shown, a door is provided on the upstream side of the main arm provided on the main shaft 6, and the float 2 is connected to a float arm 26 protruding from the main shaft 6 on the upstream side.
[0012]
The pit 4 has a structure for controlling the downstream water level. The pit 4 is provided with a still water pond 11 connected to an upstream water passage through an inlet 13 at an upstream side of the float chamber 5 with respect to the door body. 5 is provided downstream from the door body with a water passage on the downstream side of the door body through an outlet 14, and at a position lower than the bottom of the water passage, the float chamber 5 and the water reservoir 12 are connected via a drain port 27. Is communicated. Further, the inside of the float 2 is connected to the downstream pond 12 by a flexible communication pipe 15.
[0013]
The still water pond 11 is provided with an upper limit water level detecting pipe 28 provided with a height adjusting mechanism 28a at an opening at an upper end thereof, and a lower portion of the upper limit water level detecting pipe 28 is bent substantially horizontally and opened to the float chamber 5. . Further, a lower limit water level detection pipe 29 provided with a height adjustment mechanism 29a at an opening at the upper end thereof is provided at a position lower than the upper limit water level detection pipe 28 in the still water pond 11. In addition, the upper limit water level detection pipe 28 and the lower limit water level detection pipe 29 overflow the upper edge and water enters therein.
[0014]
The lower part of the lower limit water level detection pipe 29 is bent substantially horizontally and penetrates through the float chamber 5, and the lower part of the lower limit water level detection pipe 29 protruding into the retarding basin 12 is bent downward and then U-turned, and the float chamber 5 is re-formed. The end is open to the float chamber 5.
[0015]
On the other hand, a detection float 16 for detecting the downstream water level is stored in the retarding basin 12. A rod 30 is attached to a lower part of the detection float 16, and the rod 30 is inserted into a substantially vertical portion 31 of the lower limit water level detection pipe 29 at a position protruding from the water reservoir 12, and is integrally provided at a lower end of the rod 30. The valve body 32 has a substantially frusto-conical shape, and is engaged with a valve seat 31a formed on the substantially vertical portion 31 from below. In addition, packing is attached to the portion of the substantially vertical portion 31 where the rod 30 is inserted.
As shown in FIG. 1B, when the detection float 16 rises above the set water level, the valve body 32 is provided so as to engage with the valve seat 31a and close, so that the water on the upstream side floats. Room 5 is prevented from entering.
[0016]
Next, the operation of this gate will be described.
When the upstream water level is lower than the lower limit water level, there is no inflow of water from the lower limit water level detection pipe 29 into the float chamber 5, the water in the float chamber 5 flows downstream from the drain port 27, and the float 2 decreases in buoyancy and decreases. , The gate is fully closed.
[0017]
When the upstream water level is between the lower water level and the upper water level, the gate operates to maintain the set water level.
That is, when the water usage on the downstream side of the gate increases and the water level falls below the set water level, first, the detection float 16 of the downstream water level falls. Then, the valve element 32 at the lower part of the detection float 16 is also separated downward from the valve seat 31 a of the substantially vertical part 31 to open the valve, and water flows into the float chamber 5 from the lower limit water level detection pipe 29. As a result, the float 2 generates buoyancy and rises, and the gate opens. As a result, the water level on the downstream side of the gate rises and returns to the set water level.
Further, when the water suddenly flows downstream, the water level immediately downstream rises, so that the float 2 rises and works to stop the flow of water into the float chamber 5.
When the water level on the downstream side of the gate becomes equal to or higher than the set water level, the detection float 16 rises and the valve is closed, the flow from the lower limit water level detection pipe 29 to the float chamber 5 is blocked, and the water level in the float chamber 5 is reduced. Falls, the float 2 descends, and the gate descends. This lowers the water level downstream of the gate and returns to the set water level.
[0018]
Next, when the upstream water level is higher than the upper limit water level, a large amount of water flows into the float chamber 5 from the upper limit water level detection pipe 28, the float 2 rises, the gate is opened, and the function of keeping the upstream water level constant works.
[0019]
Therefore, when the upper limit water level and the lower limit water level are set at the water level on the upstream side of the gate, the door body operates without delay during this time, and the downstream water level is maintained constant.
[0020]
【The invention's effect】
The present invention is as described above. According to the first aspect of the present invention, when the water level on the upstream side of the gate is located between the upper limit water level and the lower limit water level, the amount of water in the float chamber is adjusted by the detection float of the downstream water level. By operating the float, the water level downstream of the gate can be kept constant.
In addition, when the door body is suddenly operated to adjust the amount of water, the detection float rises and falls, thereby suppressing the flow rate adjustment to the downstream side at an appropriate speed.
Further, when the water level on the upstream side of the gate is lower than the lower limit water level, there is no flow path from the upstream side to the downstream side of the gate, so that valuable water resources can be effectively used in the upstream side area of the gate.
[Brief description of the drawings]
FIG. 1 is a schematic view of a side cross section (a) and a cross section of a main part (b) of a downstream water level control device according to an embodiment of the present invention.
FIG. 2 is a plan view of a conventional tender gate.
FIG. 3 is a sectional view of a pit of the tender gate shown in FIG. 2;
FIG. 4 is a cross-sectional view around a pit of another conventional gate.
[Explanation of symbols]
2 Float 3 Door body 5 Float room 6 Main shaft 11 Still water pond 12 Reservoir 16 Detection float 26 Float arm 27 Drain port 28 Upper limit water level detection pipe 29 Lower limit water level detection pipe 31 Inside 32 Valve body

Claims (1)

A door is provided on the main shaft that crosses the waterway, and a float in the float chamber provided on the side of the waterway and a lifting / lowering operation direction are provided in the same manner, and a waterway on the upstream side of the door is provided on the upstream side of the float chamber. In addition to providing a still water pond that is communicated with, a downstream pond that is provided downstream of the float chamber and communicating with a water channel downstream of the door body, and a downstream water level that communicates the float chamber and the wet pond via an outlet. A control device,
In the still water pond, an upper end water level detection tube is provided in which an opening at one end is adjustable in height and the other end is opened to the float chamber,
A lower limit water level detection pipe is provided at the lower position of the still water pond at a position lower than the upper limit water level detection pipe so that the opening at one end is adjustable in height. Open in the float chamber,
A detection float for detecting the downstream water level is disposed in the retarding pond, and a valve body is integrally provided below the detecting float, and the valve body is disposed inside a portion of the lower limit water level detecting pipe that protrudes into the retarding pond. A downstream water level control device provided so as to close at or above a set water level of a detection float.

Images