JPH0739705A - Drainage apparatus - Google Patents

Abstract

PURPOSE:To control surely the amt. of discharge of water by a simple and inexpensive structure. CONSTITUTION:A double cylinder body 1 consisting of an outer cylinder member 2 wherein an opening part 11 is provided on the outer peripheral wall and an inner cylinder member 3 wherein an opening part 15 is provided on the outer peripheral wall 3a and which is connected with a water discharging pipe 6 is arranged under a condition where the axial direction is directed in the up and down direction in a water tank 5 and the movement in the up and down direction is controlled and the outer cylinder member 2 and the inner cylinder member 3 can be rotated relatively by means of a driving means 23. In addition, the opening parts 11 and 15 are superposed on each other with these relative movement to realize a superposed communicating condition where the inside of a water tank C and a water discharging pipe 6 are made to communicate with each other through the superposed part 35 and a communication inhibited condition where these become unsuperposed and communication between the inside of the water tank C and the water discharging pipe 6 is inhibited and under the superposed communicating condition, the lower end position 35a of the superposed part 35 is changed in the up and down direction with relative rotation between the outer cylinder member 2 and the inner cylinder member 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drainage device capable of sequentially draining water from the water surface side regardless of a drop in water level, for example, drainage used for draining supernatant water of a sedimentation tank in a wastewater treatment facility or the like. It relates to the device.

[0002]

2. Description of the Related Art Conventionally, a batch treatment method has been known as one of the treatment methods in sewage treatment facilities, and particularly in this batch treatment method, sewage is treated by passing through four treatment steps. There is. That is, the inflow process of inflowing sewage into the water tank (treatment tank), the aeration process of ejecting air into the sewage water in the water tank to perform aeration, and the sludge in the sewage water is allowed to stand for a predetermined time after completion of the aeration. Sewage treatment can be performed continuously by repeating the precipitation process of settling at the bottom and floating the supernatant water above the water tank, and discharging the supernatant water above the water tank and discharging the water in preparation for the next inflow process at predetermined intervals. Is customary.

In this wastewater treatment process, particularly in the drainage process, it is necessary to leave the sludge settling at the bottom of the water tank as it is and to discharge only the clear supernatant water above the sludge layer. When discharging the supernatant water, it is required that the supernatant water is gently discharged from the water surface side and agitating the supernatant water without floating the sludge, regardless of the decrease in the water level accompanying the drainage.

As a drainage device that responds to such demands, a float that floats above the water surface by buoyancy generally has a water collecting port that communicates with a drainage pipe, and constantly collects water from near the water surface regardless of the change in water level due to drainage. There is known a so-called float type drainage device configured to discharge. In this case, since the sludge floating in the wastewater may be discharged during the aeration process if the water intake is always below the surface of the water, it is possible to increase or decrease the buoyancy of the float, and the float floats significantly during the aeration process. In general, the water collecting port is generally located above the water surface.

[0005]

However, in such a float type drainage device, various problems as described below have already been pointed out.

First, each of the above-mentioned steps of wastewater treatment is usually controlled by a timer control. For example, in the drainage process, the supernatant water is discharged over a predetermined time after the completion of the precipitation process. The specified time for clear water is the total amount of discharge water from the full water level of the clear water to the collection water limit level (the water level that is higher than the upper surface of the sludge layer by a predetermined dimension and is set from the viewpoint of preventing the inclusion of sludge), and the drainage. It is set based on the discharge capacity of the device per hour. However, in the case of a float type drainage system, the drainage port is below the water surface and its drainage capacity is
(That is, the discharge amount per hour) is affected by the discharge head defined by the height of the discharge position and the water collection port.Therefore, in the discharge control by timer control, the target total discharge amount and It is relatively difficult to match the actual total amount of discharged water, and for example, it is possible that the water level will drop below the catchment limit water level due to drainage work for a predetermined time. A stopper mechanism for forcibly stopping the movement at the water collection limit water level is required. If this is not provided, some of the sludge will be discharged, which is not preferable.

Secondly, since the float moves up and down as the water level changes, the connecting pipe line connecting the water collecting port provided on the float and the drain pipe fixed to the water tank side is
In order to be able to follow changes in water level, it is necessary to provide a rotary joint in the middle of this if it is made of a flexible hose, or if it is made of a rigid pipe.
In addition, since it is necessary to always maintain the relative position of the water collecting port appropriately with respect to the water surface, it is also necessary to provide a guide mechanism for maintaining the posture of the float that moves up and down in accordance with the change in water level. As a result, the cost of the drainage system is high.

[0008] Therefore, the present invention has been made as a provision of a drainage device capable of reliably controlling the amount of drainage with a simple and inexpensive structure.

[0009]

In the present invention, as a concrete means for solving such a problem, an outer cylinder member having an opening on its outer peripheral wall and a relatively rotatably fitting fit in the outer cylinder member. A double cylindrical body, which is arranged and has an opening on its outer peripheral wall and an inner cylindrical member connected to the drainage pipe, has its axial direction oriented vertically in the water tank and its movement in the vertical direction is restricted. The outer cylinder member and the inner cylinder member can be relatively rotated by the driving means, and the opening of the outer cylinder member and the opening of the inner cylinder member are connected to each other. Along with the relative rotation with the inner cylinder member, these are polymerized with each other and a polymerization communication state in which the inside of the water tank and the drainage pipe are communicated with each other through the overlapped portion, and these are non-polymerized and the inside of the water tank becomes unpolymerized. And a communication blocking state that blocks communication with the drain pipe. Out, in and polymerization communicated state is characterized in that it has as structure the lower end position of the overlapping portion is changed in the vertical direction with the relative rotation between the outer cylinder member and the inner tubular member.

[0010]

According to the present invention, with such a configuration, when the double cylinder is set in the communication blocking state, the double cylinder is provided on the outer opening and the inner cylinder of the outer cylinder of the double cylinder. Since the inner opening is not in communication with each other and the communication between the inside of the water tank and the drain pipe is blocked, even if each of the above openings is located below the water surface, No drainage is performed (that is, in a sludge treatment facility, conditions other than the drainage process).

On the other hand, when the outer cylinder member and the inner cylinder member of the double cylinder body are relatively rotated by the driving means to be in the overlapping communication state, the outer opening of the outer cylinder member and the inner cylinder member are connected to each other. Are polymerized and the inside of the water tank and the drain pipe are communicated with each other through the polymerized portion, so that the water in the water tank flows into the inner tubular member from the polymerized portion and is discharged from the drain pipe. In this case, since the lower end position of the overlapped portion moves in the vertical direction as the outer cylinder member and the inner cylinder member rotate relative to each other, the outer cylinder member gradually decreases in the lower end position. By relatively rotating the inner cylinder member and the inner cylinder member, the drainage action through the overlapping portion can be continuously performed by following the decrease in the water level.

Further, in this case, since the lower end position of the overlapping portion does not drop below the lower end position of the opening of the outer cylinder member or the inner cylinder member, the water level at which drainage is possible is the formation of each of the openings. It is uniquely determined by the position and is not drained more than is necessary, as is the case, for example, with a float drainage system.

[0013]

As described above, according to the drainage device of the present invention, the double cylinder body composed of the outer cylinder member and the inner cylinder member which are rotatable relative to each other is disposed in the water tank, and the outer cylinder member and the inner cylinder member are arranged inside the water tank. By relatively rotating the cylindrical member with the driving means, the overlapping portions of the openings formed in the outer cylindrical member and the inner cylindrical member function as water collecting ports, and drainage is performed through the overlapping portions, and the polymerization is performed. The lower end position of the portion, that is, the portion that defines the drainage limit moves in the vertical direction with the relative rotation of the outer cylinder member and the inner cylinder member, and the relative rotation speed of the outer cylinder member and the inner cylinder member is changed. By properly setting, the water in the water tank can be continuously discharged from the water surface side in sequence and following the decrease of the water level, so that the amount of drainage can be easily and reliably controlled.

Further, since the double cylinder is arranged in a state in which the vertical movement of the double cylinder is restricted with respect to the water tank, the conventional float type drainage device in which the float moves up and down in accordance with the change of the water level. As is the case, there is no need to use relatively expensive parts such as flexible hoses or rotary joints, and it is not necessary to arrange a guide mechanism for maintaining the posture of the float.
The effect that the simplification and cost reduction of the device are promoted to that extent can be obtained.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The drainage device of the present invention will be specifically described below with reference to the accompanying drawings.

First Embodiment FIG. 1 shows a drainage device Z according to a first embodiment of the present invention. The drainage device Z is a device used for sequentially draining the supernatant water W located above the sludge layer M settled and deposited at the bottom of the water tank C from the water surface side in the sedimentation process regardless of the decrease in the water level. The double cylinder 1 described later
Is equipped with.

As shown in FIGS. 2 and 3, the double cylinder 1 is provided with an outer cylinder member 2 and an inner cylinder member 3 each having a bottomed cylinder body having substantially the same length.

The outer cylinder member 2 has a bottom wall 2b provided at one end thereof.
A short tubular connection pipe 4 with a flange is concentrically attached to the, and a flange 9 is attached to the open end 2c on the other end side. Further, an isosceles triangular opening 11 is formed at a substantially axially intermediate position of the outer peripheral wall 2a of the outer tubular member 2 so as to gradually narrow from the flange 9 side toward the connecting pipe 4 side. . Further, the outer cylinder member 2 has a substantially vertical structure in which the connecting pipe 4 is directed downward to the inner surface side of the side wall of the water tank C via stay members 8, 8 projecting from both ends of the outer peripheral wall 2a. Fixed in state.

In this case, the outer cylinder member 2 is attached to the water tank C in the vertical direction at the lower end 11a of the opening 11.
Is set so as to coincide with the water collection limit water level (the water level indicated by LWL in FIG. 1, which is separated from the upper surface of the sludge layer M in the maximum accumulation state by a certain dimension H). Further, the connecting pipe 4 of the outer cylinder member 2 is an L-shaped valve provided with a gate valve 7.
It is connected to a drainage pipe 6 having a character shape. The sluice valve 7 is normally kept open except in special cases such as when drainage is stopped in an emergency.

On the other hand, the inner cylinder member 3 is the outer cylinder member 2
It is composed of a cylindrical body having an outer diameter slightly smaller than the inner diameter of, and a short pipe conduit 5 having an outer diameter which can be fitted into the connecting pipe 4 is concentrically attached to a bottom wall 3b provided at one end thereof. At the same time, a drive shaft 21 is concentrically fixed to the open end 3c on the other end side via a lattice-shaped support bracket 20.
A motor 23 (corresponding to drive means in claims) is connected to the drive shaft 21 via a coupling 22. The motor 23 is fixed to a tank lid member 24 that covers the upper opening of the water tank C.

Further, the outer peripheral wall 3a of the inner cylinder member 3 has substantially the same shape and size as the opening 11 of the outer cylinder member 2 and gradually extends from the drive shaft 21 side toward the water conduit 5 side. An isosceles triangular opening 15 is formed which changes in width. At a position corresponding to the opening 15 on the outer peripheral wall 3a of the inner tubular member 3, a string-like sealing material 16 is attached in a substantially V shape so as to surround the opening 15, while Two seal members 17, 17 extending in the axial direction of the inner cylinder member 3 are mounted on the surface opposite to the opening 15.

The inner cylinder member 3 thus constructed is shown in FIG.
As shown in FIG. 2, the outer cylinder member 2 fixed to the side wall of the water tank C is fitted and inserted from the open end 2c side of the upper end thereof to form the double cylinder body 1 together with the outer cylinder member 2. In this case, the openings 11 and 15 of the outer tubular member 2 and the inner tubular member 3 are formed.
The respective vertical forming positions are set so that they can be almost completely overlapped at a specific relative rotational position (state shown in FIG. 7). In addition, the opening 1 of the outer cylinder member 2
1 and the opening 15 of the inner cylinder member 3 are not communicated with each other at a position (a position shown in FIG. 5) relatively rotated from the specific rotation position by a predetermined angle. The watertightness between the openings 11 and 15 is achieved by the sealing member 16 provided on the inner cylinder member 3 side contacting the inner peripheral surface of the outer cylinder member 2 (note that the outer cylinder member 2 and the inner cylinder). The mutual relationship between the openings 11 and 15 associated with the relative rotation with the member 3 will be described later including the operation of the motor 23).

When the inner cylinder member 3 is fitted into the outer cylinder member 2, the water guiding pipe 5 of the inner cylinder member 3 is fitted into the connecting pipe 4 of the outer cylinder member 2 to form the inner cylinder. The member 3 is substantially connected to the drain pipe 6 through the connecting pipe 4 and the water conduit 5. Further, the water conduit 5 is formed by the outer cylinder member 2
By being inserted into the connection pipe 4 of No. 2, it also functions as a radial positioning member between the outer tubular member 2 and the inner tubular member 3 on the lower end side of the double tubular body 1.

On the other hand, the radial positioning between the outer tubular member 2 and the inner tubular member 3 on the upper end side of the double tubular body 1 is carried out by mounting the outer tubular member 3 on the outer peripheral wall 3a of the inner tubular member 3. This is performed by the above-mentioned sealing materials 16, 17, 17 which are in sliding contact with the inner peripheral surface of the member 2. Therefore, the respective sealing materials 16, 17, 17 are
Both need to have a function of smoothing the relative rotation of the outer cylinder member 2 and the inner cylinder member 3 as a sliding contact member, in addition to the original seal function. The seal members 16, 17, 17 are made of a material having a high wear resistance and a small friction coefficient, for example, a Teflon resin material. The outer cylinder member 2
The donut-shaped sliding member 18 provided between the bottom wall 2b and the bottom wall 3b of the inner tubular member 3 is also made of a Teflon resin material from the same reason.

Now, the relationship between the operation of the motor 23 and the operation of the double cylinder 1 will be described. First, regarding the operation of the double cylinder body 1, the double cylinder body 1 is rotated by rotating the inner cylinder member 3 relative to the outer cylinder member 2 by the motor 23 as described above. Opening 11 and inner cylinder member 3
It is possible to change the overlapping relationship with the opening 15 of the. Specifically, as shown in FIG. 5, when the two openings 11 and 15 are completely non-polymerized, the communication between the two is cut off by the sealing material 16, so Water tank C facing the opening 11 of the tubular member 2
Communication between the inside of and the drain pipe 6 to which the opening 15 of the inner tubular member 3 is connected is blocked, and the drainage action via the double tubular body 1 is not performed. This state is the communication blocking state referred to in the claims.

On the other hand, the opening 15 of the inner tubular member 3 and the opening 1 of the outer tubular member 2 from the superposed communication state.
When rotated in the direction approaching 1 (the direction of arrow L in FIG. 6),
As shown in FIG.
Polymerization is initiated from the 1b and 15b sides. Since the superposed portion functions as a water collecting port, the superposed portion of the openings 11 and 15 will be referred to as a water collecting port 35 hereinafter. When the water collecting port 35 is formed, the outside of the outer cylinder member 2 (that is, the inside of the water tank C) and the inside of the inner cylinder member 3 (that is, the drain pipe 6) are mutually connected via the water collecting port 35. To the
The clear water W in the water tank C is discharged through the water collecting port 35.

When the relative rotation further progresses from this state, the respective opening portions 11 and 15 move downward in the overlapping range, that is, the opening area of the water collecting port 35, at the position of the lower end 35a of the water collecting port 35. As shown in FIG. 7, the openings 11 and 15 are completely overlapped with each other so that the lower end 35a of the water collecting port 35 is lower than the lower ends 11 of the openings 11 and 15.
The opening area of the water collecting port 35 becomes maximum at the time when it matches with a and 15a. In this way, from the state in which the openings 11, 15 are overlapped with each other to form the water collecting ports 35 having a similar shape to the openings 11, 15, as shown in FIG. The state until the portions 11 and 15 coincide with each other is the polymerization communication state referred to in the claims. Therefore, in this superposed communication state, the position of the lower end 35a of the water collecting port 35 is located at the upper ends 11b and 15b of the openings 11 and 15 as the outer cylinder member 2 and the inner cylinder member 3 rotate relative to each other. It moves up and down from the position corresponding to the position to the position corresponding to the lower ends 11a and 15a.

As shown in FIG. 7, the lower limit 35a of the water collecting port 35 in the completely polymerized state defines the drainage limit water level, and even if this completely polymerized state is continued for a long time, the water level is below the position of the lower end 35a. Does not go down (ie
The situation of excessive drainage cannot occur). Further, during drainage, the water collecting port 35 has a similar shape to the openings 11 and 15, and the opening angle of the water collecting port 35 on the lower end water collecting port 35a side is irrespective of the vertical position of the lower end 35a. Since it is constant, for example, the depth position of the lower end 35a of the water collecting port 35 from the water surface is kept constant (in other words, the effective opening area of the water collecting port 35 is kept constant).
By controlling the relative rotation speed of the inner cylinder member 3, continuous quantitative drainage is possible regardless of changes in the water level.

On the other hand, after the drainage in the state of FIG. 7 is completed, the water collecting port 35 is gradually rotated by rotating the inner cylinder member 3 in the direction opposite to the direction of drainage (direction of arrow R in FIG. 6). The size is reduced, and finally the communication blocking state shown in FIG. 5 is restored.

Next, regarding the operation of the motor 23, in this embodiment, the motor 23 is constituted by a geared motor equipped with a speed reducer, and the reduction ratio thereof is defined by the water level lowering rate and the effective opening area of the water collecting port 35. A fixed amount of wastewater is realized by setting it based on the relationship.

2 and 4, reference numeral 10 is a lid member which is fastened and fixed to the flange 9 at the upper end of the outer tubular member 2, and the lid member 10 is the outer tubular member of the inner tubular member 3. It has a function of preventing the member from coming off from the member 2, a function of preventing dust and the like from entering the inside thereof, and a function of reinforcing the upper end portion of the outer tubular member 2.

On the other hand, a scum baffle 30, which will be described later, is arranged on the outer side of the double cylinder 1 from the viewpoint of preventing scum suction during water collection. This scum baffle 30 is shown in FIG.
Further, as shown in FIG. 3, a baffle plate 32 constituted by an annular plate body having a diameter dimension capable of surrounding the radially outer side of the outer cylinder member 2 at a predetermined interval, and the baffle plate 32 provided outside the baffle plate 32. And a float 31 arranged so as to surround the. Then, in order to guide the vertical movement of the scum baffle 30 following the change of the water level and to restrict the movement in the radial direction and the circumferential direction thereof, two positions facing each other with the center of the inner surface side of the baffle plate 32 sandwiched therebetween. A pair of engaging protrusions 33, 33 are provided at predetermined intervals, and guide bars 12 extending in the axial direction at two positions sandwiching the axial center of the outer peripheral wall 2a of the outer tubular member 2, respectively. 12 is attached, and the guide bars 12 and 12 are engaged with the insides of the pair of engaging protrusions 33 and 33 on the scum baffle 30 side, respectively.

Further, in this embodiment, as shown in FIG. 2, in the portion 32a of the baffle plate 32 of the scum baffle 30 corresponding to the opening 11 of the outer cylinder member 2, as will be described later. From the viewpoint of more completely preventing scum suction, the lower end edge position of the baffle plate 32 is set to a position lower than that of other parts.

Next, with respect to the operation of the drainage device Z having the above-described structure and the operation and effect of each member, when the clear water W is in a full state (water level HWL) as shown by the solid line in FIG. An example will be described in which the drainage process is performed after the process is completed).

First, at the start of the drainage process, the openings 11 and 15 of the double cylinder 1 are set to the communication blocking state. In addition, the scum baffle 30 arranged outside the double cylinder body 1 has the upper end 11 of each opening 11, 15.
It is located near b and 15b.

In this state, when the motor 23 is started, the inner cylinder member 3 starts to rotate in the drainage direction (direction of arrow L in FIG. 6), and the water collecting port 35 is formed in the double cylinder body 1. To be done. Then, with the progress of rotation of the inner cylinder member 3, the drainage action via the water collecting port 35 is started from the time when the position of the lower end 35a of the water collecting port 35 reaches below the water surface. In addition, the drainage action is such that the rotation of the inner cylinder member 3 reaches the end, the water collecting port 35 is fully opened, and the water level is the water collecting port 3.
5 is continuously performed until reaching the lower end 35a.

In this drainage process, as described above, the rotation speed of the inner cylinder member 3 is controlled by the motor 23 so as to keep the effective opening area of the water collection port 35 constant, so that the water level changes with the drainage. Regardless of this, it is possible to always discharge a fixed amount of water. Further, since the water level at the end of drainage is reliably defined by the position of the lower end 35a of the water collection port 35, the situation of excessive drainage unlike the conventional float type drainage device does not occur, and the reliability is high. It is possible to control drainage.

In addition, at the time of drainage, the scum baffle 30 which descends following the change of the water level prevents the suction of scum. In this embodiment, the scaffold baffle plate 32 of the scum baffle 30 is used as described above. The position of the lower end edge of the double cylinder 1 corresponding to the water collecting port 35 is set lower than that of the other parts, so that the scum suction prevention effect of the scum baffle 30 can be further ensured. Is. That is, when draining water, the surrounding water passes through the lower end side of the baffle plate 32 and flows into the water collecting port 35 side, so that the scum floating on the water surface is prevented from flowing into the water collecting port 35. In this case, for example, when the height of the lower end edge of the baffle plate 32 is constant, water is intensively introduced from a portion close to the water collecting port 35, and the flow velocity of this portion is locally increased, so that the stirring action by the high flow velocity is caused. The sludge may be rolled up and flow into the water collecting port 35. In this case, if the lower end edge of the portion of the baffle plate 32 corresponding to the water collecting port 35 is set lower than the other portions as in this embodiment, concentrated inflow from the portion near the water collecting port 35 is suppressed. As a result, no local high-velocity portion is generated, and as a result, sludge hoisting and scum inflow are reliably prevented.

As described above, in the drainage device Z of this embodiment, the drainage amount is controlled by controlling the height position of the lower end 35a of the water collecting port 35.
For example, the drainage amount does not depend on the head difference between the drain pipe and the water collecting port as in the conventional float type drainage device, and the drainage amount can be controlled more easily and reliably. , The reliability of drainage control will be greatly improved.

Further, in this embodiment, the double cylinder 1 is fixed to the water tank C side and does not move up and down with the change of the water level unlike the float type, so that the float type drainage device is used. It is not necessary to provide a relatively expensive flexible hose or rotary joint to respond to changes in water level, as described above, and it is not necessary to provide a guide mechanism for maintaining the posture of the float. Therefore, the structure can be simplified and the cost can be reduced. It is a thing.

Second Embodiment FIG. 8 shows a double cylinder 1 constituting a drainage device according to a second embodiment of the present invention. The double cylinder body 1 of this embodiment has the same basic structure as that of the first embodiment, and is different from that of the first embodiment in that the first embodiment has an outer cylinder member 2 and an inner cylinder member. Openings 1 formed in 3 respectively
While both 1 and 15 have the same triangular shape, the opening 11 formed on the outer cylinder member 2 side is a rectangular opening extending in the axial direction, and the opening on the inner cylinder member 3 side is also formed. Reference numeral 15 indicates a rectangular opening extending in a spiral shape.

Even in the case of such a construction, by rotating the inner cylinder member 3 relative to the outer cylinder member 2, the opening 11 on the outer cylinder member 2 side and the opening on the inner cylinder member 3 side. 15
Since the position of the overlapping portion with, that is, the position of the water collecting port 35 gradually moves in the vertical direction, the same operational effect as in the case of the first embodiment can be expected.

As for the structure of the peripheral portion, in the first embodiment, the sealing property between the openings 11 and 15 is achieved by the string-shaped sealing material 16 arranged on the outer peripheral wall 3a of the inner cylindrical member 3. In contrast to this, in this embodiment, a coating layer 40 made of a rubber / resin material or the like is formed on the inner peripheral surface of the inner cylindrical member 3, and the sealing property is ensured by this coating layer 40. The difference is that you did. In this case, the coating layer 40 also functions to position the outer tubular member 2 and the inner tubular member 3 in the radial direction.

Third Embodiment FIG. 9 shows a double cylinder 1 constituting a drainage device according to a third embodiment of the present invention. Similar to the second embodiment, this embodiment has the same basic structure as that of the first embodiment, and is different from the second embodiment in that the second embodiment is different from the second embodiment. In the embodiment, the opening 15 on the inner cylinder member 3 side has a rectangular opening extending spirally, whereas a large number of circular openings 42, 42, ... This is the point that it was constructed and formed.

Even in the case of such a structure, the overlapping portion of the opening 11 of the outer tubular member 2 and the opening 15 of the inner tubular member 3 with the rotation of the inner tubular member 3, that is, the water collecting port 35. Since the lower end position of is moved in the vertical direction, the same effect as in the first and second embodiments can be expected.

In each of the above embodiments, the outer cylinder member 2
Is fixed to the water tank C side and the inner cylinder member 3 is rotated, but the present invention is not limited to this, and the point is that the outer cylinder member 2 and the inner cylinder member 3 are relatively rotatable. Is sufficient. For example, the inner cylinder member 3 is fixed to the water tank C side and the outer cylinder member 2 is rotated, or the outer cylinder member 2 or the inner cylinder member 3 is rotated with respect to the water tank C. Support as much as possible,
It goes without saying that a configuration in which both of them are rotated together can be adopted.

Further, the openings 11, 15 of the first embodiment,
The openings 11 on the outer cylinder member 2 side of the second and third embodiments are both formed parallel to the axis, but the point is that the openings 11 are formed by the relative rotation of the outer cylinder member 2 and the inner cylinder member 3. It suffices that the positions of the overlapping portions of 15, and 15, that is, the position of the water collecting port 35 are moved in the vertical direction. Furthermore, each of these openings 11, 1
Similarly, for the shape of 5, various shapes other than a triangle and a rectangle can be selected.

In each of the above embodiments, the outer cylinder member 2
One opening 11 and one opening 15 are formed in the inner cylinder member 3 and the inner cylinder member 3, respectively, but the present invention is not limited to this, and a plurality of these openings may be provided. .

Further, from the viewpoint of further improving the sealing property between the outer tubular member 2 and the inner tubular member 3, it is conceivable to form the outer tubular member 2 and the inner tubular member 3 in a tapered shape, for example.

Further, in each of the above embodiments, the motor 23 is used as the drive means, and this is constituted by the geared motor, but the present invention is not limited to this, and for example, as the motor 23. Quantitative drainage is realized by adopting a pulse motor that can obtain a rotation amount proportional to the number of input pulses and setting the number of unit pulses based on the relationship between the water level decrease rate and the effective opening area of the water collection port 35. You can also choose to do so. Further, instead of these motors, various hydraulic / pneumatic actuators such as hydraulic / pneumatic cylinders or hydraulic / pneumatic motors can be adopted as the drive means.

Further, the drainage device of the present invention is not limited to the drainage of the supernatant water in the sewage treatment facility as in the above embodiment,
It is needless to say that it can be widely applied to a drainage device in which water is sequentially collected and drained from the water surface side.

[Brief description of drawings]

FIG. 1 is a sectional view of a main part of a sewage treatment facility including a drainage device according to a first embodiment of the present invention.

2 is a partially enlarged cross-sectional view of the drainage device shown in FIG.

3 is a sectional view taken along line III-III in FIG.

FIG. 4 is an exploded perspective view of the drainage device shown in FIG.

FIG. 5 is an operation explanatory view of the drainage device.

FIG. 6 is an operation explanatory view of the drainage device.

FIG. 7 is an explanatory diagram of the operation of the drainage device.

FIG. 8 is an exploded perspective view of a drainage device according to a second embodiment of the present invention.

FIG. 9 is an exploded perspective view of a drainage device according to a third embodiment of the present invention.

[Explanation of symbols]

1 is a double cylinder, 2 is an outer cylinder member, 3 is an inner cylinder member, 4 is a connecting pipe, 5 is a water pipe, 6 is a drain pipe, 7 is a sluice valve, 8 is a stay member, 9 is a flange, 10 is A lid member, 11 is an opening portion, 1
2 is a guide bar, 15 is an opening, 16 is a sealing material, 17
Is a sealing material, 18 is a sliding member, 20 is a support bracket,
21 is a drive shaft, 22 is a coupling, 23 is a motor, 2
4, tank lid material, 30 scum baffle, 31 float,
32 is a baffle plate, 33 is an engaging protrusion, 40 is a coating layer, 42 is an opening, C is a water tank, M is a sludge layer, W is clear water, and Z is a drainage device.

Claims (1)

[Claims] 1. An outer cylinder member having an opening on an outer peripheral wall thereof, and an outer cylinder member fitted and arranged so as to be rotatable relative to the outer cylinder member and having an opening on the outer peripheral wall and connected to a drain pipe. A double cylinder body including an inner cylinder member is arranged in the water tank in a state in which its axial direction is oriented in the up-down direction and movement in the up-down direction is restricted, and the outer cylinder member and the inner cylinder member are driven. The outer cylinder member and the inner cylinder member are overlapped with each other by the relative rotation of the outer cylinder member and the inner cylinder member. A polymerization communication state in which the inside of the water tank and the drain pipe are communicated with each other through a polymerization portion, and a communication blocking state in which these become non-polymerization and block communication between the water tank interior and the drain pipe are revealed, and In the overlapped communication state, the lower end position of the overlapped portion and the outer cylinder member Drainage device, characterized in that the as configured changes in the vertical direction with the relative rotation of the tubular member.