JP2004255286A - Screw type filtration and dewatering apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a screw type filtration and dewatering apparatus of which the filtration body is assembled and disassembled accurately, quickly and easily and thus produced at a low cost and is excellent in the maintenance property. <P>SOLUTION: The screw type filtration and dewatering apparatus comprises a cylindrical filtration body 6 obtained by arranging a large number of circular filtration plates 7 at narrow gaps from one another in layers in a cylindrical outer frame 1 having a filtered water flow out window 2 in the wall face and using the respective narrow gaps as filtered water flow out grooves 8 and a screw conveyer 16 fitted in the center hole using the starting aperture of the filtration body 6 as the sludge sending-in port and the terminal aperture as the dewatered cake sending-out port. The outer circumferential rim of each circular filtration plate 7 has a fitting part 9 for positioning formed by grooving and a rod 3 for stopping rotation of the plate along the inner circumference of the cylindrical outer frame 1 is formed vertically. The respective circular filtration plates 7 are arranged in the cylindrical outer frame 1 in such a state that the fitting part 9 for positioning is engaged with the rod 3 for stopping rotation. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention provides, for example, a screw-type filtration dewatering method for separating a suspension containing suspended fine particles generated in a relatively small-scale sewage treatment operation represented by an oxidation ditch method into a filtrate and suspended fine particles. It concerns the device.
[0002]
[Prior art]
A large number of annular filtration plates are arranged in a stacked manner while maintaining a required interval to form a cylindrical filter body having a gap between the annular filtration plates as a drainage drainage groove, and a starting end opening of the filter body is formed. 2. Description of the Related Art A screw type filtration dewatering apparatus in which a screw conveyor is fitted in a center hole with a sludge feeding port and a terminal opening as a dewatering cake feeding port is known. In order to maintain the state of formation of the filter, generally, holes for bolt insertion are drilled in ears protruding from a plurality of locations around each annular filter plate, and a short tubular spacer is interposed to form each plate. A structure is adopted in which a through bolt is inserted into each of the holes of the ears, and an end of the through bolt is screwed with a nut (for example, see Patent Document 1).
[0003]
[Patent Document 1]
JP-A-9-220599 (FIG. 1-4)
[0004]
[Problems to be solved by the invention]
However, in the structure disclosed in Patent Document 1, a large number of annular filtration plates and short tubular spacers must be inserted into a plurality of through bolts one by one when assembling the filter body, which requires a great deal of time and labor. As a result, the workability of assembling is poor and the production cost is increased. This type of apparatus for handling sludge often requires maintenance and inspection involving disassembly of the filter body, such as replacement of a worn plate. In the structure shown in Patent Document 1, a plurality of threads are required for disassembly. The bolts must be extracted from each annular filter plate and the short tubular spacer, and after disassembly, the filter body must be assembled again in the above-described procedure.
[0005]
SUMMARY OF THE INVENTION An object of the present invention is to provide a screw type filtration dewatering apparatus that can accurately and quickly and easily assemble and disassemble a filter body, can be manufactured at low cost, and has excellent maintainability.
[0006]
[Means to solve the problem]
In the screw-type filtration dewatering apparatus according to claim 1 of the present invention, a large number of annular filtration plates are arranged in a stacked manner while holding a narrow gap therebetween in a cylindrical outer frame having a drainage outflow window opened on a wall surface. A slit between each of the annular filtration plates is formed in a cylindrical filter body having a drainage drainage groove, and the start opening of the filter is a sludge feed port, and the end opening is a discharge port of a dehydrated cake. In a screw type filtration dewatering apparatus fitted with a screw conveyor, a positioning fitting portion is engraved on the outer peripheral edge of each annular filtration plate and a detent rod is vertically provided along the inner periphery of the cylindrical outer frame. The annular filter plates are arranged in the cylindrical outer frame in a state in which the positioning fitting portion is engaged with the detent rod. Further, in the screw type filtration and dewatering apparatus according to the second aspect, based on the premise of the first aspect, the detent rod vertically provided on the inner periphery of the cylindrical outer frame is screwed from the outside of the cylindrical outer frame. The bolts are fixed by bolts, and the bolts are removed so that the bolts can be extracted from the ends of the cylindrical outer frame.
[0007]
DESCRIPTION OF THE PREFERRED EMBODIMENTS
This will be described with reference to the following embodiments shown in FIGS.
[0008]
Reference numeral 1 denotes a cylindrical outer frame provided with drainage outflow windows 2... 2 at key points on a wall surface, and 3 denotes a detent rod vertically provided along the inner periphery of the cylindrical outer frame 1. Is fixed by a bolt 4 screwed from the outside of the cylindrical outer frame 1, and can be extracted from the end of the cylindrical outer frame 1 by removing the bolt 4. Is inserted into the concave groove 5 engraved on the inside of the cylindrical outer frame 1 so as to be extractable from the frame end of the cylindrical outer frame 1, or is inserted into the concave groove 5 engraved on the inside of the cylindrical outer frame 1. It is fixed by a bolt 4 screwed from the outside of the cylindrical outer frame 1 and can be extracted from the end of the cylindrical outer frame 1 by removing the bolt 4. Reference numeral 6 denotes a cylindrical filter body, in which a large number of annular filter plates 7,... 7 are arranged in a stacked manner in the cylindrical outer frame 1 while maintaining a required gap, and each annular filter plate 7,. Are formed in the drainage outflow grooves 8. A positioning fitting portion 9 is engraved on the outer peripheral edge of each of the annular filtering plates 7... 7, and each of the annular filtering plates 7 is locked by locking the positioning fitting portion 9 to the detent rod 3. .. 7 are arranged in the cylindrical outer frame 1. The annular movable plates 10 may be loosely fitted between the laminations of the annular filtration plates 7, respectively. Numeral 11... 11 is a spacing holder protruding at a key point on the plate surface of each of the annular filtration plates 7... When the annular movable plates 10. The spacers 11 are provided at positions slightly thicker than the thickness of the annular movable plates 10 and are kept in a non-contact state with the respective annular movable plates 10. Reference numeral 12 denotes a fixed ring for holding the formed state of the filter 6, which is detachably fixed to the end of the cylindrical outer frame 1. Then, a screw conveyor 16 is fitted into the center hole 15 with the opening at the start end of the filter 6 as the feed port 13 for sludge and the end opening at the feed port 14 for the dehydrated cake. Reference numeral 17 denotes a prime mover for driving the screw conveyor 16, and reference numeral 18 denotes a discharge pressure adjusting valve attached to the delivery port 14.
[0009]
When the prime mover 17 is driven, the screw conveyor 16 rotates (when the annular movable plates 10... 10 are loosely fitted between the laminations of the annular filtration plates 7. Performs an eccentric rotational movement along the gap between the annular filtration plates 7,... 7), and the sludge sent into the filter body 6 from the inlet 13 advances in the axial direction while turning along the screw blade 16B. , The filtered water flows down through the drainage outlet channels 4 and 4 and the drainage outlet windows 2 and 2 and is dewatered, and the dehydrated cake having a reduced water content is sequentially discharged from the front outlet 14. Is done. When the filter body 6 is disassembled by replacing a worn plate or the like, the annular filter plates 7... (And the annular movable plates 10. It can be easily removed. When the detent rod 3 is fixed so as to be extractable, the detent rod 3 is extracted from the end of the cylindrical outer frame 1 to rotate the annular filtration plates 7. Since the filter body 6 can be withdrawn in the axial direction while being removed, the filter body 6 can be more easily disassembled.
[0010]
【The invention's effect】
ADVANTAGE OF THE INVENTION According to this invention, assembling and disassembly of a filtration body are performed accurately, quickly and easily, it can manufacture at low cost, and can provide the screw-type filtration dehydration apparatus which was excellent also in maintainability.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional side view schematically showing a configuration of a screw type filtration dewatering apparatus of the present invention.
FIG. 2 is a vertical sectional side view of a main part of the screw type filtration and dewatering apparatus of the present invention.
FIG. 3 is a vertical sectional front view of the screw-type filtration dewatering apparatus of the present invention.
FIG. 4 is a vertical sectional front view of a cylindrical outer frame in the screw-type filtration / dehydration apparatus of the present invention.
FIG. 5 is a front view of an annular filtration plate in the screw-type filtration dewatering apparatus of the present invention.
FIG. 6 is a vertical sectional front view of a cylindrical outer frame in the screw-type filtration / dehydration apparatus of the present invention, wherein a rotation preventing rod vertically provided on the inner periphery of the cylindrical outer frame is screwed from outside the cylindrical outer frame. Fig. 3 shows an example of being fixed by a bolt.
FIG. 7 is a vertical sectional front view of a cylindrical outer frame in the screw-type filtration / dehydration apparatus of the present invention, showing a case where a detent rod is fitted into a concave groove formed in the inner periphery of the cylindrical outer frame. Show.
FIG. 8 is a longitudinal sectional front view of a cylindrical outer frame in the screw-type filtration and dewatering apparatus of the present invention, wherein a detent rod is fitted into a concave groove formed in the inner periphery of the cylindrical outer frame, and The example which is being fixed by the bolt screwed from the outside of a frame is shown.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Cylindrical outer frame 2 Drainage outflow window 3 Non-rotating rod 4 Bolt 6 Filter body 7 Annular filtration plate 8 Drainage outflow groove 9 Positioning fitting 13 Sludge inlet 14 Sludge outlet 15 Center hole 16 Screw conveyor

Claims (2)

A tube in which a large number of annular filtration plates are arranged in a stacked manner while holding a gap between each other in a cylindrical outer frame having a drainage outflow window opened on the wall surface, and a gap between each annular filtration plate is used as a drainage outflow groove. In a screw-type filtration and dehydration apparatus formed by fitting a screw conveyor in the center hole with the opening at the start end of the filtration body as the inlet for sludge and the outlet at the end as the outlet for the dewatered cake, A positioning fitting is engraved on the outer peripheral edge of the annular filtration plate, and a detent rod is vertically provided along the inner periphery of the cylindrical outer frame, and the detent rod is engaged with the positioning fitting. Wherein each annular filtration plate is arranged in a cylindrical outer frame depending on a state of the screw filtration dehydration apparatus. A detent rod vertically provided on the inner periphery of the cylindrical outer frame is fixed by a bolt screwed from the outside of the cylindrical outer frame, and the bolt is removed from the frame end of the cylindrical outer frame. The screw-type filtration / dehydration apparatus according to claim 1, wherein the apparatus is configured to be extractable.

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