JP3751578B2 - Screw type filter dehydrator - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention is, for example, a screw-type filter dehydration for separating a suspension containing suspended fine particles generated in a relatively small-scale sewage treatment operation represented by an oxidation ditch method into filtrate and suspended fine particles. It relates to the device.
[0002]
[Prior art and its problems]
A large number of annular filtration plates are fixed in a stacked manner while maintaining a required interval, and a ring-shaped movable plate is interposed between the annular filtration plates to form a cylindrical filter body. And forming a screw conveyor in the center hole with the starting end opening of the filter body as a solid-liquid feeding port and the terminal opening as a dehydrating solids feeding port, and in conjunction with the rotation of the screw conveyor, an annular movable plate A screw type filter dehydrator configured to rotate eccentrically is known from Japanese Patent Publication No. 7-73642.
[0003]
The slits between the plates serve as the separation water outflow grooves. If this is too narrow, the outflow of moisture will worsen, and if it is too wide, a large amount of solids will flow out. Will drop. Accordingly, it is necessary to set the slits between the plates to an appropriate size in accordance with the properties of the solid liquid to be processed. In the invention described in the above Japanese Patent Publication No. 7-73642, a slit is provided on the plate surface of the annular movable plate so that a constant slit is secured between the plates. ing. However, disposing such protrusions at important points on the plate surface is a difficult process and increases the manufacturing cost, and has a drawback that the sliding contact area becomes small and wears out early.
[0004]
As a measure for keeping the slits between the plates constant without providing slits for holding the slits, an annular movable plate is formed by arranging the cylindrical filter body 101 in an inclined manner as shown in FIG. It has been proposed that 103 is stably polymerized to the upper surface 102A of the lower annular filtration plate 102 by its own weight, and the separated water flows out from the slit Bg secured on the lower surface 102B of the upper annular filtration plate 102. However, in order for the annular movable plate 103 to stably polymerize to the upper surface 102A of the lower annular filtration plate 12 by its own weight, the slope of the filter body 101 is steep, and the weight of the annular movable plate 103 is large. It must be finished so that the slip of the inner peripheral surface is good.
[0005]
The dewatered cake after the treatment is dropped into the collection tank or is transported to the next processing place by the belt conveyor. In order to smoothly communicate with the collection tank and the belt conveyor, the dehydrated solids are sent out. It is desirable to install the tubular filter body 101 in a gentle gradient so that the mouth is held at a slightly higher position than the solid-liquid supply port. However, if this slopes steeply and the solids outlet is open at a high position, the connection with the collection tank and belt conveyor becomes unsmooth, and the height of the filtration dehydrator itself increases and the room becomes thicker. This is inconvenient for installation in places subject to height restrictions. Further, in order to increase the weight of the annular movable plate 103, the thickness thereof must be increased. As a result, the interval S between the slits Bg and Bg becomes rough, and the outflow of moisture becomes worse. The solid-liquid separation function is lowered, and the cylindrical filter body 101 is also lengthened. Accordingly, a long screw conveyor 111 is required, and the entire apparatus is lengthened. Since the annular plate is generally made by punching a metal plate with a press machine, the inner peripheral surface and the outer peripheral surface are not smooth. However, in order for the annular movable plate 103 to move down along the outer periphery of the screw blade 111B by its own weight, the inner peripheral surface of the plate must be finished to be a smooth surface, which is more expensive than providing a slit holding convex. It will be. Furthermore, when the solid liquid rises along the screw conveyor 111, the annular movable plate 103 is lifted by the influence thereof, and the slit Bg formed between the upper annular filtration plate 102 is unstable. In particular, there is anxiety when treating sludge with a high concentration. As described above, there is a question about the practicality of the above-described proposed technique that attempts to regulate the size of the slit using the weight of the annular movable plate 103.
[0006]
OBJECT OF THE INVENTION
The object of the present invention is to provide a separation water outflow groove of a required gap without providing a slit holding convex, which can be manufactured at a low cost, has an excellent solid-liquid separation function, and has good maintainability. An object of the present invention is to provide a filter dewatering device.
[0007]
[Structure of the invention]
In the screw type filtration dewatering device according to the present invention, a large number of annular filtration plates are fixed in a laminated form while maintaining a required interval, and an annular movable plate is loosely fitted between the annular filtration plates, respectively, to form a cylindrical shape. Formed in the filter body, the starting end opening of the filter body is used as a solid-liquid feed port, the end opening is used as a dehydrated solids feed port, a discharge pressure adjusting valve is attached to the feed port, and the outer diameter of the screw blade is annular A screw conveyor formed to be larger than the inner diameter of the movable plate and smaller than the inner diameter of the annular filtration plate is fitted into the center hole of the filter body, and the outer peripheral edge of the screw blade is the inner peripheral edge of each annular movable plate when the screw conveyor is driven. In contact with each other to cause eccentric rotation and vibration operation on each annular movable plate, and the vibration is suppressed by the pressing force accompanying the movement of the solid liquid. The front surface of the movable plate is in sliding contact with the rear surface of the front annular filtration plate, and the rear surface of each annular movable plate is separated from the front surface of the rear annular filtration plate, and a separation water outflow groove with a fixed gap is secured in the separation portion. After the dehydrated solids are sent out, the sliding contact state with the annular filtration plate is relaxed, and the annular movable plate causes eccentric rotation and vibration operation, so that a part of the front surface is annularly filtered forward. The plate was slidably contacted with the back surface, and a part of the back surface was slidably contacted with the front surface of the rear annular filtration plate.
[0008]
【Example】
The embodiment will be described below with reference to FIGS.
[0009]
Reference numeral 1 denotes a cylindrical filter body, in which a plurality of annular filtration plates 2... 2 are arranged in a stacked manner with a gap therebetween, and a plurality of annular movable plates 3. 2 and has a seat portion 5.. 5 formed on the outer periphery of each annular filtration plate 2 larger in diameter than the outer diameter of each annular movable plate 3. The interval holders 6, 6 attached to 5 are regulated so that the interval between the annular filtration plates 2, 2 is held slightly larger than the wall thickness of the annular movable plates 3, 3. Reference numerals 7... 7 denote fixed bodies that support the respective seats 5... 5 and are constructed so as to be in contact with the annular movable plates 3. In addition, the outer peripheral surface of the filter body 1 may be surrounded by an outer cylinder (not shown) provided with through holes at important points.
[0010]
The starting end opening of the filter body 1 becomes a feed port 8 for solid liquid such as raw sewage water, and the end opening becomes a feed port 9 for solids such as dehydrated cake, and a screw conveyor 11 is fitted in the center hole 10. Reference numeral 12 denotes a prime mover for driving the screw conveyor 11, and 13 denotes a discharge pressure adjusting valve attached to the delivery port 9. The screw conveyor 11 is formed such that the outer diameter M of the screw blade 11B is larger than the inner circumference B of each annular movable plate 3.. 3 and smaller than the inner diameter A of each annular filtration plate 2. The annular filtration plate 2 and the annular movable plate 3 are used while being punched out by a press machine, and it is not necessary to finish the inner peripheral surface and the outer peripheral surface to a particularly smooth surface.
[0011]
[Action]
By driving the screw conveyor 11, the outer peripheral edge of the screw blade 11B slides obliquely on the inner peripheral edge of each annular movable plate 3, 3 to cause eccentric rotation and vibration operation on each annular movable plate 3,. However, due to the pressing force associated with the movement of the solid-liquid mixture fed from the feed port 8 in the filter body 1, the swinging operation of each of the annular movable plates 3,. While sliding in contact with the back surface 2B of the annular filtration plate 2, the back surface of each annular movable plate 3,... 3 is separated from the front surface 2A of the rear annular filtration plate 2, and a separated water outflow groove 4 with a fixed gap is formed in the separation portion. 4 is secured, and after the dehydrated solids are sent out, the sliding contact with the front annular filtration plate 2 is relaxed, and each of the annular movable plates 3. Wake up It becomes door.
[0012]
Thus, during the movement of the solid liquid by the drive of the screw conveyor 11, the separated water outflow grooves 4.. 4 of a certain gap are secured on the front surface 2 A of each annular filtration plate 2. It flows out of the filter body 1 through the separated water outflow grooves 4... 4, and the clogging of the separated water outflow grooves 4. . Since a lubricating film made of liquid or the like is formed on the sliding contact surface between the back surface 2B of the front annular filtration plate 2 and the annular movable plate 3, the eccentric rotational motion is performed very smoothly by the lubricating action. The dehydrated solids are sent out from the delivery port 9. After the dehydrated solids are sent out, the sliding contact state between the front surface of each annular movable plate 3 and the rear surface 2B of each annular filtration plate 2 is relaxed. By causing the plate 3 to be eccentrically rotated and oscillated, a part of the front surface comes into sliding contact with the rear surface 2B of the front annular movable plate 2, and a part of the rear surface comes into sliding contact with the front surface 2A of the rear annular filtration plate 2. Become. Therefore, if the idling operation is performed for a while after the sludge is discharged and flushing water is flushed during that time, the filter body 1 is automatically cleaned. Further, even when the operation of the screw conveyor 11 is stopped simultaneously with the completion of the sludge discharge, the sliding contact state between the annular filtration plate 2 and the annular movable plate 3 is released, so that this portion can be manually cleaned. is there.
[0013]
【The invention's effect】
In the screw type filtration dehydration apparatus of the present invention, a separation water outflow groove of a required gap is secured without providing a slit holding convex, which can be manufactured at a low cost and has an excellent solid-liquid separation function. There is an advantage that the cleaning operation after the discharge is easy and the maintainability is also good.
[Brief description of the drawings]
FIG. 1 is a longitudinal side view schematically showing the configuration of a screw-type filtration and dehydration apparatus that is an object of the present invention.
FIG. 2 is a longitudinal sectional side view of an essential part of the apparatus of the present invention, and schematically shows a state during solid-liquid movement accompanying driving of a screw conveyor.
FIG. 3 is a cross-sectional plan view of an essential part of the apparatus of the present invention, and schematically shows a state in which the screw conveyor is being driven after the dehydrated solids are sent out.
FIG. 4 is a longitudinal front view of the device of the present invention.
FIG. 5 is a longitudinal sectional front view of a filter body in the device of the present invention.
FIG. 6 is a longitudinal front view of a screw conveyor in the device of the present invention.
FIG. 7 is a longitudinal sectional side view of a main part of a screw-type filtration and dehydration apparatus proposed as a structure in which a gap between each plate is kept constant without providing a slit holding convex.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Cylindrical filter body 2 Annular filtration plate 2A Front surface of annular filtration plate 2B Rear surface of annular filtration plate 3 Annular movable plate 4 Separation water outflow groove 8 Solid liquid feed port 9 Dehydrated solid content feed port 10 Center hole of filter body 11 Screw conveyor 11B Screw blade
13 Discharge pressure adjustment valve A Inner diameter of annular filtration plate B Inner diameter of annular movable plate M Outer diameter of screw blade

Claims (1)

A large number of annular filtration plates are fixed in a stacked manner while maintaining a required interval, and an annular movable plate is loosely fitted between the annular filtration plates to form a cylindrical filter body. A discharge pressure adjusting valve is attached to the outlet with the opening as the solid-liquid inlet and the terminal opening as the dehydrated solids outlet, and the outer diameter of the screw blade is larger than the inner diameter of the annular movable plate. A screw conveyor formed smaller than the inner diameter is fitted into the center hole of the filter body, and when the screw conveyor is driven, the outer peripheral edge of the screw blade is in sliding contact with the inner peripheral edge of each annular movable plate to perform eccentric rotation and vibration operation. Oscillating action is suppressed by the pressing force generated by the moving action of the solid liquid generated in each annular movable plate, and the front surface of each annular movable plate is the front annular filtration plate. And the back of each annular movable plate is separated from the front surface of the rear annular filtration plate, and eccentric rotation is performed with a separation water outflow groove having a fixed gap secured in the separation portion. After the feeding, the sliding contact state with the annular filtration plate is relaxed, and the annular movable plate causes eccentric rotation and vibration operation so that a part of the front surface is in sliding contact with the rear surface of the front annular filtration plate and A screw type filter dehydrating apparatus, wherein the portion is configured to be in sliding contact with the front surface of the rear annular filtration plate.

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