JPS624162B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an opening/closing device for a drainage channel or the like.

More specifically, simply by supplying a certain amount of starting water into the water tank inside the float, it is possible to automatically open the circuit and start drainage, and after the completion of drainage, the circuit can be automatically returned to the closed state. This relates to a fully automatic switchgear that does not require electrical control or hydraulic control.

This type of switchgear utilizes the buoyancy generated in the float by water being poured into the water tank to open the circuit, but it is not used in flow path systems that require a large opening operation force. In the opening/closing device, a very large float is required to increase the buoyancy to obtain the opening operation force, and therefore a large water tank is required to house the float. This has major disadvantages in terms of installation space and equipment costs.
Furthermore, a large amount of starting water is required to float the large float over the required stroke, which limits its uses.

The present invention provides an opening/closing device for drainage channels, etc., which can solve all of the above-mentioned problems. An embodiment in which the present invention is used as an opening/closing means will be described based on the attached illustrative drawings.

In Fig. 1, 1 is a filtration tank, 2 is a water purification tank connected to the top of the filtration tank 1, 3 is a raw water tank located higher than the water purification tank 2, 4 is a deceleration tank, and 5 6 is an inverted U-shaped pipe for a siphon in which the lower end of the rising pipe part 5a is connected to the raw water supply part 1a of the filtration tank 1; 6 is an automatic opening/closing means connected to the lower end of the descending pipe part 5b of the inverted U-shaped pipe 5; Reference numeral 7 denotes a cylindrical filter medium (hereinafter abbreviated as a filter tube) vertically installed inside the filter tank 1. The upper U-turn portion 5c of the inverted U-shaped pipe 5 is connected to the water purification tank 2.
This upper end U-turn portion 5 is located at a higher place than the upper end of the
The upper part in c and the bottom part in the water purification tank 2 are connected to a communicating pipe 8.
It is communicated by.

As shown in FIG. 2, the filter tube 7 is loosely fitted concentrically into the porous tube 9 with a certain annular space in between, and is held by an upper end cover plate 10a and a lower end cover plate 10b. ing. The porous pipe 9 has an upper end penetrating the partition wall 11 between the filtration tank 1 and the water purification tank 2 and opens into the water purification tank 2, and a lower end opening through the cap 1.
It is blocked by 2. Reference numeral 13 denotes an outer cylinder which is fitted concentrically to the filter cylinder 7 with a certain annular space 14 in between.The upper end of the outer cylinder 13 is attached to the upper end cover plate 10a, and the lower end is open.

Details of the automatic opening/closing means 6 are shown in FIG. As shown in the figure, the automatic opening/closing means 6 includes an upper main opening/closing valve 15, a lower auxiliary opening/closing valve 16, and a water tank 18 in which a float 17 is installed.
The main opening/closing valve 15 includes a valve case 20 which is provided with a conical valve seat 19 and whose upper end communicates with the descending pipe portion 5b of the inverted U-shaped pipe 5, and which is movable up and down within the valve case 20. a conical movable valve body 22 with a through passage 21 in the direction, and the conical valve seat 1
On the side of 9, the valve body 2 is located at the lower limit position.
A valve hole 23 is provided which is closed by 2. Reference numeral 24 denotes a water discharge tank in which the upper and lower valves 15 and 16 are housed, and is provided with a water discharge pipe 25 and communicates with the valve hole 23.

The auxiliary opening/closing valve 16 includes a needle valve element 27 that opens and closes a valve hole 26 formed at the bottom of the valve case 20 at a position concentric with the movable valve element 22 by vertical movement.
The needle valve body 27 has an upper shaft portion 27a that passes through the movable valve body 22 so as to be relatively vertically movable, and can push up the movable valve body 22 by upward movement. A space 28 below the valve hole 26 that is opened and closed by the needle valve body 27 is connected to a communication hole 29.
It communicates with the water tank 24 through a hole 30, and with the water tank 18 through a communication hole 30.

The float 17 in the water tank 18 moves the needle valve body 27 of the sub-opening/closing valve 16 by upward movement.
It can be pushed up via its upwardly protruding shaft portion 17a. 31 is a small-diameter siphon tube for draining water from the water tank 18. 32 is a communication pipe that communicates the inside of the water tank 18 with the upper part of the upper end U-turn portion 5c of the inverted U-shaped pipe 5.

Next, the method of use and effect will be explained. Water with low suspended solids (SS), such as river water, industrial sewage, and general wastewater, or pretreated water (hereinafter referred to as raw water) is supplied to the raw water tank 3 through the raw water supply pipe 33, and is supplied to the raw water tank 3 through the overflow pipe 34. The water flows into the deceleration tank 4 through the water supply pipe 35 while being maintained at a constant water level. Here, the flow rate is reduced, and the water enters the filtration tank 1 from the bottom opening of the filtration tank 1, that is, the raw water supply section 1a, via the water supply pipe 36 and the flow rate adjustment valve 37. The purified water after being filtered by the filter cylinder 7 in the filter tank 1 enters the water purification tank 2, and the inside of the water purification tank 2 is kept at a certain level L1.
After the water is filled to the maximum, it overflows from the water outlet pipe 38 at the upper end of the water purification tank and is used as water supply. 39 is an air vent pipe from inside the water purification tank 2. A portion of the raw water supplied to the raw water supply section 1a of the filtration tank 1 enters the rising pipe section 5a of the inverted U-shaped pipe 5 and naturally rises due to water pressure. The flow rate regulating valve 37 in the water supply pipe 36 is adjusted and fixed so that the amount of water coming out from the water outlet pipe 38 is a specified amount. At this time, the raw water level L in the rising pipe section 5a of the inverted U-shaped pipe 5
2 and the purified water level L1 in the water purifying tank 2 becomes the filtration start water head H1 of this device.

SS adheres to filtration 7 as filtration operation progresses
The amount of water increases, the water flow resistance in this filtration 7 increases, and the amount of filtrated water decreases. On the other hand, since the amount of raw water supplied is constant, the level of raw water in the rising pipe section 5a increases, and a part of the raw water finally passes over the upper U-turn section 5c of the inverted U-shaped pipe 5 and flows into the descending pipe section 5b. begins to flow into At this time, as shown in FIG.
is at the lower limit position, and the valve holes 23 and 26, which are opened and closed by the valve bodies 22 and 27, are closed, so that raw water is stored in the downcomer pipe portion 5b. The air inside the inverted U-shaped pipe 5 is transferred to the communication pipe 3.
2, water tank 18, communication holes 30, 29, water tank 24,
and is discharged via the water discharge pipe 25.

The raw water that flows into the downcomer pipe section 5b and gradually rises finally reaches a level L3 at which it fills the entire inverted U-shaped pipe 5, including the upper end U-turn section 5c. Connecting pipe 3 from the top of
The raw water flows into the water tank 18 via 2. As a result of the raw water flowing into this water tank 18 lifting the float 17, its upper end protruding shaft portion 17a
pushes up the needle valve body 27 of the sub-opening/closing valve 16 and opens the valve hole 26. Subsequently, the rising needle valve body 7 pushes up the movable valve body 22 of the main opening/closing valve 15, so that the valve body 23 is opened. Therefore, the raw water in the downcomer pipe section 5b is rapidly discharged from the water discharge pipe 25 via the valve box 20, the valve hole 23, and the water discharge tank 24, and as a result, the siphon action is started, and the raw water is continuously discharged. Ru. By making the amount of water discharged per unit time due to this siphon action sufficiently larger than the amount of water supplied per unit time of raw water supplied from the water supply pipe 36, the water absorption power of the high water head due to the siphon action is It acts on the purified water in the water purification tank 2 via the filter tank 1, and the purified water in the water purification tank 2 passes through the filtration tank 1 and the inverted U-shaped pipe 8, together with the raw water supplied from the water supply pipe 36. It is continuously released from the release pipe 25. This becomes high water head backwash water for the filter cylinder 7.

That is, the water level difference between the raw water level L3 that has reached the upper end of the inverted U-shaped pipe 5 and the purified water level L1 in the water purifying tank 2 becomes the backwashing start water head H2 for the filter cylinder 7, and the backwashing effect is started as described above. As a result, the SS adhering to the front side of the filter cylinder 7 is treated with high head backwash water at a pressure corresponding to a low to medium level water head in the range from filtration start water head H1 to backwash start water head H2. The filter cylinder 7 in the filter tank 1 is then washed and removed by the purified water in the water purification tank 2 that flows in the opposite direction from the back side to the front side.

When the purified water level in the water purification tank 2 reaches a lower limit level L4 equal to the opening level of the communication pipe 8, air flows into the upper U-turn portion 5c of the inverted U-shaped pipe 5 via this communication pipe 8. Therefore, the siphon action is stopped, the raw water supplied from the supply pipe 36 flows into the filtration tank 1 again, and the desired filtration action is started. At the same time, the raw water in the rising pipe section 5a of the inverted U-shaped pipe 5 is at a level L corresponding to the filtration start water head H1.
Go back to 2.

In addition, during the filter cylinder backwashing action based on the above-mentioned siphon action, the water tank 18 in the automatic opening/closing means 6
The water inside is gradually discharged from the siphon pipe 31, but a larger amount of water than this discharged water flows into the communication pipe 32,
Since the water continuously flows into the water tank 18 from the valve hole 26 of the sub-opening/closing valve 16 and the water discharge tank 24, the float 17 is maintained in a floating state to a required level. Furthermore, when the backwashing action is completed due to the inflow of air into the inverted U-shaped pipe 5, the water in the descending pipe section 5b flows through the valve hole 23 of the main opening/closing valve 15 and the valve hole 26 of the auxiliary opening/closing valve 16. After the water in the water tank 18 is completely drained out, the water in the water tank 18 is discharged by the siphon pipe 31, and as a result, the float 17 is lowered, and the needle valve body 27 and the movable valve body 22 are accordingly lowered by gravity. The valve holes 23 and 26 are respectively closed. In this way, preparations for the next backwashing operation are completed.

The opening/closing device for drainage channels, etc. of the present invention can be implemented and used like the automatic opening/closing means 6 in the above embodiment, and its feature is that the valve hole on the side of the valve case is placed in the lowered position. An upper main opening/closing valve equipped with a conical movable valve body that is closed and has a vertical passage, and a needle valve that can be raised and lowered to close a valve hole provided at the bottom of the valve case at the lower limit position. A lower sub-opening/closing valve having a body and a water tank having a float inside which can be filled with water, the floating of the float pushes up a needle valve body of the lower sub-opening/closing valve to open a valve hole of the sub-opening/closing valve, The upward movement of the needle valve element pushes up the movable valve element of the upper main opening/closing valve to open the valve hole of the main opening/closing valve, and is equipped with a siphon pipe for automatically draining water from the water tank inside the float. At the point.

According to the opening/closing device of the present invention, simply by supplying a certain amount of starting water (raw water supplied from the communication pipe 32 in the embodiment) into the water tank inside the float, the circuit is automatically opened and drainage starts. It can be conveniently used as a fully automatic opening/closing device that does not require electrical control or hydraulic control, and can automatically return to a closed state after draining is completed. According to the structure, the movable valve body in the main opening/closing valve in the closed state also flows upward through the through passage to the stored water (in the embodiment, the downcomer pipe portion 5b
Since the movable valve body receives water pressure (raw water inside the valve) and is pressed against the valve seat by the pressure difference between the water pressure acting downward, the operating force required to move the movable valve body upward to open the circuit is small. It's over. On the other hand, what the floating float directly pushes up is the needle valve element of the sub-opening/closing valve, and although upward water pressure does not act on this as mentioned above, since it is a needle valve element, it is reliably pushed up by the slight buoyancy. I was able to push it up. Therefore, the opening operation force of the opening/closing device as a whole required to push up the needle valve element of the auxiliary opening/closing valve and to push up the conical movable valve element of the main opening/closing valve with the needle valve element is less than that of the conventional general opening/closing valve. Device,
In other words, the opening operation force required by the main opening/closing valve alone is extremely small compared to the opening/closing force required in a switching device that directly pushes up the conical movable valve body to open the circuit.

In addition, in the open state, waste water flows between the outer periphery of the conical movable valve body of the main opening/closing valve and the through passage, and flows into the valve hole located on the side of the movable valve body. , the force exerted on the movable valve body in the direction of closing the valve by the outflowing waste water is also small, and in particular,
The discharge flow rate of wastewater is adjusted so that the inside of the valve box containing the conical movable valve body is always filled with wastewater, and buoyancy is applied to the conical movable valve body in an open state. As a result, the acting force for maintaining the open circuit can be small.

As a result, even if a small float with low buoyancy is used, the circuit opening operation can be performed reliably and smoothly. Furthermore, since a small float is sufficient, the water tank in which the float is housed can also be small, and the amount of starting water supplied to the water tank can also be small, resulting in tremendous economic effects.

In addition, in the embodiment, the main opening/closing valve is opened (valve hole 2
A part of the wastewater discharged by the opening of 3) and the wastewater flowing out by the opening of the sub-opening/closing valve (opening of the valve hole 26) are introduced into the water tank 18 inside the float, and the water level in the water tank 18 is raised. However, it is possible to continuously supply water into the tank 18 so that the water level in the tank 18 can be maintained at a predetermined level until drainage is completed. When implemented with such a configuration, all waste water can be discharged into the discharge pipe 25. Furthermore, if the conical movable valve body 22 and the needle valve body 27 can completely close the corresponding valve holes 23 and 26, then both the valve bodies 2
It is also possible to configure 2 and 27 integrally.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of the configuration of a filtration device using the opening/closing device of the present invention, FIG. 2 is a vertical side view showing details of the inside of the filtration tank, and FIG. 3 is an illustration of the automatic opening/closing device according to an embodiment of the present invention. FIG. 1...filtration tank, 1a...raw water supply section, 2...water purification tank,
3... Raw water tank, 5... Inverted U-shaped pipe for siphon, 5a
... Ascending pipe section, 5b... Descending pipe section, 5c... Upper end U-turn section, 6... Automatic opening/closing means, 7... Filter tube, 8, 32...
Communication pipe, 9... Porous pipe, 13... Water guide outer cylinder, 15...
Upper main opening/closing valve, 16...Lower auxiliary opening/closing valve, 1
7... Float, 18... Water tank, 19... Conical valve seat,
21... Penetration path, 22... Conical movable valve body, 23, 2
6...Valve hole, 24...Water tank, 25...Water pipe, 27...
Needle valve body, 31...Small diameter siphon pipe, 33
...Raw water supply pipe, 34...Overflow pipe, 35,
36... Water supply pipe, 37... Flow rate adjustment valve.

Claims (1)

[Claims] 1. An upper main opening/closing valve equipped with a conical movable valve body that closes the valve hole on the side surface of the valve case at the lower limit position and has a vertical passage, and a valve hole provided at the bottom of the valve case. The needle valve of the lower sub-opening/closing valve is equipped with a lower auxiliary opening/closing valve equipped with a needle valve element that can be raised and lowered to close the lower auxiliary opening/closing valve at the lower limit position, and a water tank inside a float that can be filled with water. The needle valve element is pushed up to open the valve hole of the auxiliary opening/closing valve, and the upward movement of the needle valve element pushes up the movable valve element of the upper main opening/closing valve to open the valve hole of the main opening/closing valve. An opening/closing device for drainage channels, etc., which is equipped with a siphon pipe that automatically drains water from the water tank inside the float.