JP2000005521A - Cushioned gap multiplate screw press filter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To form a cushion structure for removing or relaxing the effect of the solid penetrating between the plates in the multiplate screw press filter. SOLUTION: A filter cylinder 2 formed by alternately and overlappingly arranging many annular fixed plates 11 and many annular movable plates 12 with a minute filtration gap among them is set between an inlet chamber 1 for receiving the raw water to be treated and an outlet chamber 3 for discharging the treated cake, a screw 5 extended from the inside of the inlet chamber and piercing the whole length of the filter cylinder is arranged, a mechanism 13 is furnished to oscillate the movable plate, and a surface cushion layer 11a consisting of rubber or synthetic resin is formed on any one face among the opposed faces of the fixed plate and the adjacent movable plate to constitute the multiplate screw press filter.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-plate screw press filtration apparatus for filtering treated raw water containing sludge and other suspended matter to separate the filtrate into a filtrate and a dewatered cake.

[0002]

2. Description of the Related Art As a conventional multi-plate screw press filtration apparatus, there is a screw-through filter cylinder installation system as described in, for example, Japanese Patent Publication No. 63-36464 (Patent No. 1520106). In this type of filtration device, a filtration tube for filtering raw water from the inside of the drum to the outside in a radial direction is installed in a substantial range excluding both end portions in the drum, and a drum peripheral surface in the substantial range is provided. A large number of through-holes are provided, and furthermore, a screw penetrating through the filter tube is arranged over the entire length of the drum, so that both ends in the drum are used as an inlet chamber for treated raw water and an outlet chamber for a dewatered cake. It was done. The filtration passage in the filter tube is formed by a minute gap between the plates in an alternate arrangement of the annular fixed plate and the annular movable plate that constitute the tube.

[0003] In the above configuration, when the raw water to be introduced into the filter cylinder is a 100% inorganic fresh concrete washing drainage, etc., when the inorganic solids in the raw water enter the filtration gap between the plates, the movable water is moved. Scratching and locking of the plate, or wear of the plate rubbed against the solid matter,
This may cause a decrease in filtration dewatering efficiency, a failure or stop of the device, and the like.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a multi-plate screw press filtration apparatus provided with a cushion structure between plates which can reduce the influence of the intrusion of solids into the plate gap as described above. It is to be.

[0005]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention comprises: a) a plurality of annular fixing plates and an opening having a diameter slightly larger than the opening diameter of the fixing plate. It consists of a number of annular movable plates capable of swinging in the same plane at the same amplitude, and alternately overlapping arrangements each having a small filtration gap, and a fixed cylindrical space is defined by the row of openings of the fixed plate. The formed filtration tube,
B) installed between an inlet chamber for receiving treated raw water and an outlet chamber for discharging treated cake; and b) arranging a screw starting from the inlet chamber and penetrating the entire length of the cylindrical space of the filter tube. By providing a mechanism for swinging the movable plate by rotation of the screw, the processing raw water received in the filter tube from the inlet chamber is pressed and propelled toward the outlet chamber, and the swinging of the movable plate causes A screw press filtration device wherein said filtration gap between plates is constantly regenerated, and c) a surface cushion made of rubber or synthetic resin on one of opposing surfaces of said fixed plate and a movable plate adjacent thereto. A layer is formed.

[0006] According to the above structure, the inorganic solid material that has entered between the plates is buried in the surface cushion layer made of rubber or synthetic resin formed on the surface of the fixed plate or the movable plate. (Pressing effect) is greatly reduced or reduced. The frequency of solid intrusion between the plates varies depending on the raw water to be treated,
Until the surface cushion layer is damaged or degraded by a large number of invading solids, the above-described relaxation and attenuation effects are maintained.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of the present invention will be described below with reference to the accompanying drawings.

In the embodiment of the screw press filtration device of the present invention, as shown in FIG. 1, an inlet chamber 1, a filter tube 2 and an outlet chamber 3 are provided continuously from the right, and are formed on an inner peripheral surface 4 of the filter tube 2. A screw 5 penetrates into the cylindrical space to be formed, and its screw blade is supported by a screw shaft 5a extending from the inlet chamber 1 to a position short of the outlet chamber 3 over substantially the entire length of the present filtration device. An inlet hole 1a for receiving the raw water for treatment is formed in an upper part of the inlet chamber 1, and an outlet hole 3a is formed in a lower part of the outlet chamber 3. The screw shaft 5a has a main leading edge 5b corresponding to the screw blade that ends immediately before the outlet chamber 3 from the filter tube 2, and forms a small-diameter tip shaft 5c therefrom. This tip shaft 5c is connected to the outer end wall 3 of the outlet chamber 3.
The bearing is supported at b. The tip shaft 5c fits and supports an outlet valve 6 having a substantially trapezoidal diameter cross section so as to be movable in the axial direction, and a coil spring 7 is mounted behind the end valve 5c.
The valve 6 is pressed forward by the coil spring 7 and occupies a closed position where the front end face abuts the main front edge 5b at all times or at the time of starting the apparatus.

The rear end plate 8 of the filter tube 2 has an inner peripheral edge 8a connected to the inner peripheral surface 4. The inner peripheral edge 8a projects slightly rearward, and its distal end is constantly pressed against the coil spring 7 at the start of the apparatus. The valve 6 is pressed against the conical side surface of the valve 6, thereby closing the outlet of the filter tube 21.

The filter cylinder 2 has the above-mentioned rear end plate 8 and front end plate 9, and is provided between these end plates 8, 9;
Each filtration of a number of annular fixed plates 11 fixed by the support rods 10 (FIG. 2) and the like and a number of annular movable plates 12 having a center opening diameter slightly larger than the center opening diameter of the fixed plates. The movable plate 12 is capable of swinging in the same plane by a cam mechanism described later at an amplitude corresponding to a difference in diameter between the movable plate 12 and the fixed plate 11. In this case, the inner peripheral surface 4 that defines the above-described cylindrical space is formed by the row of openings of all the fixed plates 11, and the opening edge of the movable plate 12 does not narrow the inner peripheral surface 4 due to its swing. Dimensioned. Therefore, the outer edge of the screw 5 is fitted to this inner peripheral surface, and can rotate continuously.

The outer ends of the screw shafts 5a, 5c are supported by bearings installed on the outer end plates 1b, 3b of the inlet chamber 1 and the outlet chamber 3, and the main screw shafts projecting from the bearings of the inlet chamber outer end plate 1b. The outer end of 5a fixedly supports the gear 13. A gear 14 meshed with the gear 13 is a thin rotary shaft 1 extending from the inlet chamber 1 over the entire length of the filter cylinder 2.
The gears 13 and 14 are driven by further gears or the like (not shown) to interlock the screw 5 and the rotating shaft 15. As is clear with reference to FIG. 2, the rotating shaft 15 penetrates the fixed plate 11 and the movable plate 12 at the lower part of the filter tube 2,
In this penetrating range, the diameter is further reduced, and a cam key 16 protrudes in the axial direction on the peripheral surface of the small diameter portion 15 ′.

The fixed plate 11 has a circular outer periphery or a non-circular (not shown, for example, substantially triangular) outer edge contour forming the outer peripheral surface of the filter tube 2 and a circular or substantially circular shape defining the cylindrical space 4 described above. In one embodiment of the present invention, the opening plate of FIG.
It has a surface cushion layer indicated by a. This surface cushion layer 11a is formed of natural or synthetic rubber or elastic plastic.

All the fixed plates 11 are penetrated and supported by the four support rods 10. Spacers formed of small disks which are also penetrated and supported by the support rods 10 between the adjacent plates 11 with the movable plate 12 interposed therebetween. 17 maintain the mutual spacing. On the other hand, the movable plate 12 is
The annular plate has an outer periphery slightly smaller than the circular fixed plate 11 formed with a concave portion 18 surrounding the portion with a margin, and an opening 19 having a diameter slightly larger than the opening (cylindrical space 4) of the fixed plate 11, and upper and lower portions thereof. An upper hole 20a and a lower hole 20b are respectively formed, and a fulcrum rod 2 is formed in the upper hole 20a.
1 is loosely fitted, and the above-described intermediate small diameter portion 15 'of the rotating shaft 15 is fitted into the lower hole 20b. Small diameter part 1
As is clear from FIG. 1, the lower hole of each fixing plate 11 through which 5 ′ penetrates corresponds to the circular locus of the cam key 16 or has a diameter larger than that of the cam key 16 so that the small diameter portion 15 ′, Therefore, although the rotation of the rotating shaft 15 is permitted, the above-described lower hole 20b of each movable plate 12 has only a diameter slightly larger than the size obtained by adding the projection size of the cam key 16 to the main body diameter of the small diameter portion 15 '. As the cam key 16 rotates, it is driven by a cam to rotate eccentrically, and the movable plate 12 itself mainly swings up and down with a fulcrum rod 21 penetrating through the upper hole 20a as a fulcrum.

Next, as apparent from FIG. 3, which is a partial cross-sectional view enlarged along the line BB in FIG. 2, the spacer 17 in the recess 18 is formed by two fixed plates 11 , 11 (specifically, the surface cushion layer 11a, 1
1a), having a thickness that is slightly greater than the thickness of the movable plate 12, thereby forming a small filtration gap between the plates 11, 12.
Thus, a filter tube 2 (FIG. 1) composed of an array of a number of plates 11 and 12 is completed.

In the structure of the first embodiment described above, when the main screw shaft 5a is driven, the gear train 13,
The rotary shaft 15 also rotates via the cam key 16 at the same time.
Is rotated, the lower hole 20b (see FIG. 2) of the movable plate 12 is eccentrically rotated as described above. With this, the upper hole 20a of the entire movable plate 12 can float around the fulcrum rod 21. Swing in range. In this case, the height of the cam key 16 is set between the fixed plate 11 and the movable plate 1.
2 and the difference between the inner diameter of the small hole 20a and the diameter of the fulcrum rod 21 is set to be substantially equal to this, so that the opening 19 of the movable plate 12 is in the lowest state shown in FIG. The upper edge coincides with the opening of the fixed plate 11, that is, the upper end of the inner peripheral surface of the filter cylinder 2, and in the uppermost state in which the rotary shaft 15 has rotated half a turn, the lower edge has the opening of the fixed plate 10, that is, the inner peripheral surface of the filter cylinder 2. Of the rotating shaft 15
During rotation, it does not enter the inside of the filter cylinder inner peripheral surface 4.

The treated raw water introduced from the inlet 1a is propelled by the screw 5 in the inlet chamber 1, and is supplied into the filter tube 2 without stagnation. The raw water treated by the screw 5 in the filter cylinder 2 is gradually squeezed, and is radiated through the filtration gap constantly (slidably) regenerated between the plates 11 and 12 by the swing of the movable plate 12 described above. The water is filtered and dehydrated from the outer periphery. The processing phase that has reached the front 3 of the outlet chamber 3 enters the outlet chamber 3 by pushing the outlet valve 6 backward against the coil spring 7 due to an increase in pressure due to the increase of the subsequent processing phase by the screw 5. As a result, the treatment phase that has reached the outlet chamber 3, that is, the cake whose moisture content has been sufficiently reduced is discharged from the outlet hole 3a.

As described above, the raw water to be treated is 100 minerals.
% Of fresh concrete washing drainage, etc., the inorganic solid matter in the treated raw water easily enters between the plates 11 and 12. However, the inorganic solids are in this case fixed plate 11
Buried in the surface cushion layer 11a made of rubber or synthetic resin formed on both surfaces of the substrate, the effect (pressing effect) on the metal plate surface on the opposite side is greatly reduced or reduced. For example, when the solid foreign matter 22 is sandwiched between the conventional fixed plate 11 'and the movable plate 12' shown in FIG. 4A, when the movable plate 12 'is driven to rise, the solid foreign matter Corners 22a, 22 of
Due to the rotational moment generated between the fixed plates 11 ′, the space between the fixed plate 11 ′ and the fixed plate 11 ′ is partially expanded with the rise as shown in FIG. 4B. Such movement of the movable plate may cause contact with another fixed plate or stop if the movement itself is impossible. On the other hand, according to the present invention, as is apparent from FIG. 5, the above-described rotational moment of the solid substance 23 (see FIG. 5A) is absorbed by being buried in the cushion layer 11a (FIG. 5).
b).

Thereafter, the infiltrated solids slide with the opposing plate without difficulty while being held in the cushion layer 11a in the most stable posture. Also, the frequency of solid intrusion between the plates varies depending on the raw water to be treated,
The surface cushion layer is eventually damaged or degraded by a large number of invading solids while continuing to exhibit the above-mentioned relaxing and reducing effects, and the cushion layer may be repaired for the first time.

[0019]

As described above, according to the present invention, a multi-plate screw press filtration device having a cushion structure between plates capable of mitigating the influence of the intrusion of solid matter into the plate gap is constituted. It also enables effective and long-time use in the treatment of fresh concrete washing and drainage.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a first embodiment of a multi-plate screw press filtration device of the present invention.

FIG. 2 is a sectional view taken along the line AA of FIG.

FIG. 3 is a partial cross-sectional view taken along the line BB of FIG. 2;

FIG. 4 is a schematic cross-sectional view showing a state (a) in which solid foreign matter enters a conventional inter-plate structure and a state (b) between plates affected by a rotational moment due to the solid foreign matter.

FIG. 5 is a schematic cross-sectional view showing a state (a) in which solid foreign matter enters the inter-plate structure of the present invention and a state (b) between plates affected by a rotational moment caused by the solid foreign matter.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Inlet room 2 Filter tube 3 Outlet room 4 Cylindrical space 5 Screw 5a Main screw shaft 5b Main tip edge 5c Tip shaft 6 Outlet valve 7 Coil spring 8 Filter tube rear end plate 9 Filter tube front end plate 10 Support rod 11 Fixing plate 11a Surface Cushion layer 12 Movable plate 13, 14 Gear 15 Rotation axis 16 Cam key 17 Spacer 22, 23 Infiltration solid

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) C02F 11/12

Claims (1)

[Claims] A) a plurality of annular fixed plates, and a plurality of annular plates having an opening diameter slightly larger than the opening diameter of the fixed plate and capable of swinging in the same plane at an amplitude corresponding to the difference in the opening diameters. With a movable plate, a filtration tube, which consists of an alternately superimposed array with each minute filtration gap, and defines a fixed cylindrical space by the row of openings of the fixed plate,
B) installed between an inlet chamber for receiving treated raw water and an outlet chamber for discharging treated cake; and b) arranging a screw starting from the inlet chamber and penetrating the entire length of the cylindrical space of the filter tube. By providing a mechanism for swinging the movable plate by rotation of the screw, the processing raw water received in the filter tube from the inlet chamber is pressed and propelled toward the outlet chamber, and the swinging of the movable plate causes A screw press filtration device wherein said filtration gap between plates is constantly regenerated, and c) a surface cushion made of rubber or synthetic resin on one of opposing surfaces of said fixed plate and a movable plate adjacent thereto. A multi-plate screw press filtration device characterized by forming a layer.