JP2000015013A - Filtration gap regulation type multi-plate screw press filter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a multi-plate screw press filter in which spring spacer structure capable of regulating a filtration gap between plates is constituted. SOLUTION: A filter barrel 2 which is constituted by alternately overlapping and arranging many annular stationary plates 11 and many annular movable plates 12 and holding respective fine gaps for filtration, is installed. A screw 5 passing through the whole length of the filter barrel is arranged and also a mechanism rocking the movable plates is provided. Coil springs 18 which are pinched and pressed on the mutual opposite faces of respective two stationary plates pinching the respective movable plates, are arranged and also a supporting rod 10 screwed in the tip is fittably passed through rod holes 22 in the center of the parts corresponding to the springs of the respective stationary plates. The rear end of the supporting rod is fixed to the outlet end part of the filter barrel. On one side, the tip screw part of the supporting rod is projected from the inlet end part of the filter barrel. The intervals between the respective stationary plates are regulated by a female screw means such as a lock nut.

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. In recent years, the device is often implemented by omitting the drum portion that must surround the filtration tube portion.

In the above configuration, there is a case where it is desired to change the minute gap between the plates in accordance with the concentration, the viscosity and the like of the raw water introduced into the filter tube. That is, in the case of high concentration or high viscosity, the gap must be relatively large, and in the case of low concentration or low viscosity, the gap must be made as small as possible to exhibit appropriate filtration / dehydration ability.

[0004]

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a multi-plate screw press filtration device having a spring spacer structure capable of changing and adjusting the plate gap.

[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 for constantly regenerating the filtration gap between the plates, c) two fixed plates each sandwiching the movable plate at an appropriate position in an opening or a peripheral space formed in each movable plate. Coil springs are arranged on the mutually opposing surfaces, and a rod hole is formed in the center of the spring corresponding portion of each fixing plate. A threaded adjustment rod is fitted and penetrated so that the rear end of the adjustment rod is fixed to the outlet end of the filter cylinder formed of the alternately overlapping arrangement of the plates. It is characterized in that it protrudes from the inlet end and the spacing between each fixed plate can be adjusted by female screw means such as a fastening nut.

According to the above arrangement, the fixed plate interval is adjusted according to the concentration or viscosity of the raw water to be treated,
The filtration gap formed between the movable plate located in the interval and the fixed plate on each side is also adjusted.
It can operate effectively in the dewatering performance.

[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 2.

The filter tube 2 has the above-mentioned rear end plate 8 and a front end plate 9 on the inlet side which is also connected to the inner peripheral surface 4 of the filter tube. Construction support rod 10
And an alternating plate arrangement of a number of annular fixed plates 11 arranged and successively spaced apart from each other and a number of annular movable plates 12 respectively arranged in the intervals. A filter gap is formed between movable plates. The movable plate 12 has a center opening diameter slightly larger than the center opening diameter of the fixed plate, and can swing in the same plane at an amplitude corresponding to the difference in diameter from the fixed plate 11 by a cam mechanism described later. . In this case, the inner peripheral surface 4 that defines the above-mentioned cylindrical space is formed by the row of openings of all the fixed plates 11, and the opening edge of the movable plate 12 is swung by the inner peripheral surface 4.
Dimensions are set so as not to narrow. 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 apparent from FIG.
Has a cam key 16 which penetrates through the fixed plate 11 and the movable plate 12 in the lower part of the filter tube 2, has a smaller diameter in this penetrating range, and protrudes in the axial direction on the peripheral surface of the small diameter portion 15 ′. Fixing plate 1
Reference numeral 1 denotes a circular outer periphery or a non-circular (not shown, for example, a substantially triangular) outer edge contour forming the outer peripheral surface of the filtration tube 2 and a circular or substantially circular opening defining the cylindrical space 4 described above. It is an aperture plate.

The four support rods 10 have their rear ends (not shown) fixed to the rear end plate 8 of the filter tube 2 and their front ends to the front end plate 9.
Is formed as a screw portion 10a (FIG. 1) protruding from the front projection 9a of the front projection 9a. The front face of the front projection 9a is pressed by a nut 10b engaged with the screw 10a so as to regulate the length between both end plates 8, 9. Has become. As shown in FIG. 3, the front projection 9a has a front end plate 9 that communicates with the inner peripheral surface 4 of the filter cylinder with the same diameter.
By making the opening diameter larger than that of the main body and fittingly accepting the rear end of the inlet cylinder 1c having the same diameter as the inner peripheral surface 4, a slight positional displacement occurs with respect to the fixed inlet cylinder 1c. This allows fine adjustment of the interval between the end plates 8 and 9.

Referring again to FIG. 2, the movable plate 12
Has a U-shaped notch 17 surrounding each support rod 10 with a margin, and two fixed plates 11 facing each other with the movable plate 12 interposed therebetween are coiled by a coil spring 18 surrounding the support rod 10 in the notch 17. The opposing portion surfaces are pressed and supported, and the mutual interval is maintained by fittingly penetrating the support rod 10 into a rod hole 22 provided at the center of the opposing portion surface. That is, the coil spring 18 forms a spring spacer for arranging the fixed plate 11.

In this embodiment, the movable plate 12 is an annular plate having an outer periphery slightly smaller than the circular fixed plate 11 and an opening 19 having a diameter slightly larger than the opening of the fixed plate 11 (the cylindrical space 4). Upper hole 2 in part
0a and the lower hole 20b, respectively, and the upper hole 20a
The fulcrum rod 21 is loosely fitted in the lower hole 20b, and the intermediate small diameter portion 15 'of the rotary shaft 15 is fitted in the lower hole 20b. As shown in FIG. 1, the lower hole of each fixing plate 11 through which the small-diameter portion 15 ′ passes 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 in the fixed state. Although the rotation of the rotary shaft 15 is permitted, the above-mentioned lower hole 20b of each movable plate 12 has a diameter slightly larger than the sum of the diameter of the main body of the small-diameter portion 15 'and the projection of the cam key 16. Therefore, the cam plate 16 is driven eccentrically by the rotation of the cam key 16 to rotate eccentrically, and the movable plate 12 itself mainly swings up and down with the fulcrum rod 21 penetrating through the upper hole 20a as a fulcrum.

FIG. 4 is a partial cross-sectional view taken along line CC of FIG. 2 and enlarged. 4, the coil spring 18 in the notch 17 maintains the distance between the two fixed plates 11, 11 at a distance slightly larger than the thickness of the movable plate 12, A small filtration gap g is formed between the plates 11 and 12.
Such a mutual interval between the fixed plates 11 is distributed by changing the compression state of the coil spring 18 according to the length between the front and rear end plates 9 and 8 of the filter cylinder 2. In the end, the end plates 8 and 9 described above by tightening and tightening the nut 10b with respect to the tip screw portion 10a of the support rod 10 that has passed through the rod hole 22 of each fixing plate 11
Obviously, it is set in the fine adjustment of the interval.

In the structure of the embodiment described above, when the main screw shaft 5a is driven, the gear trains 13, 14
As a result, the lower shaft 20b (see FIG. 2) of the movable plate 12 is eccentrically rotated by the rotation of the cam key 16 as described above. Swings in a range in which the upper hole 20a can move around the fulcrum rod 21. In this case, the height of the cam key 16 is set to be equal to the inner diameter difference between the fixed plate 11 and the movable plate 12, 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.
In the lowermost state shown in FIG. 2, the upper edge of the opening 19 of the movable plate 12 coincides with the opening of the fixed plate 11, that is, the upper end of the inner peripheral surface of the filter tube 2. Coincides with the opening of the fixed plate 10, that is, the lower end of the inner peripheral surface of the filter cylinder 2, and does not enter the inside of the inner peripheral surface 4 of the filter cylinder during one rotation of the rotating shaft 15.

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 compressed and constantly (slidably) regenerated by the swing of the movable plate 12 through a filtration gap g having a thickness suitable for the treated raw water. The water is radially 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 processing phase that has reached the outlet chamber 3, that is, the cake whose moisture content has been sufficiently reduced is reduced to the outlet hole 3
is discharged from a.

[0019]

As described above, according to the present invention, a multi-plate screw press filtration device having a spring spacer structure capable of adjusting a plate gap, that is, a filtration gap, is provided. It also exerts filtration and dehydration effects.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing an 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. 1;

FIG. 4 is a partial sectional view taken along the line CC of FIG. 2;

[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 U-shaped notch 18 Coil spring (spring spacer)

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) B01D 33/58 B30B 9/14

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 for constantly regenerating the filtration gap between the plates, c) two fixed plates each sandwiching the movable plate at an appropriate position in an opening or a peripheral space formed in each movable plate. Coil springs are arranged on the mutually opposing surfaces, and a rod hole is formed in the center of the spring corresponding portion of each fixing plate. A threaded support rod is fitted and penetrated so that the rear end of the support rod is fixed to the outlet end of the filter cylinder formed of the alternately overlapping arrangement of the plates, while the distal end thread portion of the support rod is fixed to the filter cylinder. A multi-plate type screw press filtration device with a filtration gap adjustment, wherein the distance between each fixed plate is adjustable by female screws such as a fastening nut so as to protrude from an inlet end.