JP2000084317A - Multiplate screw-press type filtration equipment provided with pressure varying means - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the mobility of moisture in a treating phase by varying a raw water pressing force of a screw-press type filtration equipment. SOLUTION: This equipment consists of the alternately superimposed arrangement of annular fixed plates 10 and annular movable plates 11, a stationary cylindrical space is demarcated by a series of the openings of the fixed plates, and the inner periphery 4 of the cylindrical space is inscribed in the opening of the movable plates to constitute a filtration cylinder 2. Further, a screw 5 is let penetrate the cylindrical space, mechanisms 14, 15 and 16 are provided to oscillate the movable plates by the rotation of the screw, and a pressure varying means 6 is furnished to vary the raw water pressing force at least any one place in the region extending from one end to the other end of the filtration cylinder.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a screw press type 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 A conventional screw press type filtration device is disclosed, for example, in JP-B-63-65364 (Patent No. 152).
No. 0106) There is a screw-through filter tube installation system as described in the gazette. This type of filtration device
In a substantial area excluding both ends in the drum, a filtration cylinder for filtering the treated raw water in the radial direction from the inside of the cylinder to the outside of the cylinder is provided, and a large number of through holes are provided on the drum peripheral surface in the substantial area. In addition, a screw penetrating the filter tube is arranged over the entire length of the drum, and both ends in the drum are used as an inlet chamber for treated raw water and an outlet chamber for a dewatered cake. 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. As a simplified version of this type, a type in which the above-described drum with a through hole is omitted and a filter cylinder is exposed is often used.

[0003] In the above construction, when the raw water is normally propelled by a screw having the same pitch over the entire length and within the filter cylinder having the same cross-sectional area over the entire length, the force acting on the raw water at each position does not fluctuate. In some cases, the movement of water is not active, and the filtration / dewatering efficiency is reduced.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a multiplex method in which the raw water treatment pressure is varied during the feeding in order to prevent the inactivation or stagnation of water in the treatment phase as described above. An object of the present invention is to provide a plate-type screw press filtration device.

[0005]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention comprises: a) a plurality of fixed plates each having a central opening, and the same having an opening diameter slightly larger than the central opening diameter of the fixed plate; With a large number of movable plates capable of swinging in the plane, formed with an alternating superimposed array with each minute filtration gap, having a cylindrical inner peripheral surface regulated by the opening of each fixed plate. B) a screw that penetrates the filter tube, and c) a mechanism that swings the movable plate by rotation of the screw, so that treated raw water received from one end of the filter tube can be used for other purposes. Pressing and pushing toward the end,
A screw press filtration apparatus wherein the filtration gap between the movable plates and each fixed plate is constantly regenerated by swinging the movable plates. D) The raw water pressing force in the filtration tube is increased from one end to the other end. A pressure variation means for varying the pressure at at least one of the points.

The pressure fluctuation means of the present invention is provided by 1) forming an interruption portion on the screw blade, 2) forming a pitch fluctuation portion on the screw blade, and 3) forming a projection on the screw shaft. Is done.

[0007] According to the above configuration of the present invention, since the pressure of the raw water phase to be treated in the filter cylinder can be changed by the pressure fluctuation means in the process of being propelled by the screw blades, the movement of water in the phase is promoted and stable. Filtration and dehydration become possible.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a screw press type filtration apparatus according to a preferred embodiment of the present invention will be described with reference to the drawings.

In the first embodiment of the multi-plate screw press filtration apparatus of the present invention, as shown in FIG. 1, an inlet chamber 1, a filter cylinder 2 and an outlet chamber 3 are provided continuously from the right. The screw 5 penetrates the cylindrical space surrounded by the peripheral surface 4. The screw 5 is composed of a screw blade supported on a shaft 5 a extending from the inlet chamber 1 to the outlet chamber 3. In this case, the screw blade has an interruption portion 6 at a position slightly closer to the inlet than the middle portion of the filter tube 2, and has an end ( The downstream end 5b is aligned with the end of the filter tube 2 and faces the discharge valve 7 fitted and supported on the shaft 5a on the outlet chamber 3 side.
The discharge valve 7 has a conical surface on the front side facing the screw 5, and the back side is supported by a spring 7a located around the shaft 5a. As a result, the discharge valve 7 closes the opening of the end plate 8b of the filter tube 2 when the apparatus is stopped or at the beginning of driving, and shuts off the filter tube 2 and the outlet chamber 3.

The filter tube 2 has a number of annular fixing plates 10 fixedly arranged in a comb-like manner by, for example, four support rods 9 laid between the filter tube start end plate 8a and the end plate 8b. A plurality of annular movable plates 11 having an opening diameter slightly larger than the opening diameter of the fixed plate are arranged in an alternately superposed arrangement with a small gap for each filtration. The movable plate 11 is connected to the fixed plate 10 by a cam mechanism described later. It is possible to swing in the same plane at an amplitude corresponding to the aperture difference. In this case, a cylindrical space having the above-mentioned inner peripheral surface 4 is defined by the row of openings of all the fixed plates 10, and the inner peripheral surface 4 is inscribed and surrounded by the openings of the movable plate 11, The inner peripheral surface 4 is not narrowed by the swing. Therefore, the outer edge of the screw 5 is
And can rotate continuously.

Both ends of the shaft of the screw 5 are supported by bearings installed on the outer end plates 12 and 13 of the inlet chamber 1 and the outlet chamber 3, and the shaft ends protruding from the bearings of the outlet chamber outer end plate 13 via gears or the like. , And is interlocked with another rotating shaft 15 by a gear train 14. The rotating shaft 15 is provided at the lower part of the filtration device at the outer end plate 1.
The movable plate 11 can be oscillated by having the cam key 16 extending between 2 and 13 and extending in the axial direction within the range of the filter tube 2. The swing mechanism of the movable plate 11 can be better understood with reference to FIG. 2 drawn along the line AA of FIG.

As is apparent from FIG. 2, in this case, the fixed plate 10 has an outer periphery that forms the outer peripheral surface of the filter tube 2;
It has a perfect annular shape having the above-mentioned opening forming the cylindrical inner peripheral surface 4, and itself is penetrated by four support rods 9.
Each space is maintained by a spacer 17 which is supported and is also formed of a small disk that is penetrated and supported by the support rod 9. On the other hand, the main body of the movable plate 11 has an outer peripheral edge 18 located inside the four spacers 17 in the same plane, and an inner peripheral edge 19
Opening (19) having a diameter slightly larger than the opening (cylindrical inner peripheral surface 4)
And has overhanging portions 20a and 20b at the upper and lower portions thereof. A margin hole 21 is formed in the upper overhang portion 20a, and a fulcrum bar 22 is loosely fitted therein. An engagement hole 23 is formed in the lower overhang portion 20b, and the above-described rotary shaft 15 is fitted therein. Thus, the entire movable plate 11 is supported and driven. The fulcrum rod 22 is provided between the filter tube end plates 8a and 8b so as to occupy a position axially symmetric with the rotation shaft 15 in the filter tube 2.

As is apparent from FIG. 3, which is drawn along the line BB of FIG.
The outer spacer 17 has a thickness that sets the distance between the fixed plates 10, 10, in this case a thickness that is slightly greater than the thickness of the movable plate 11, so that
A minute filtration gap 24 is formed between the two, thus completing the filtration tube 2 (FIG. 1) comprising an array of a number of plates 10 and 11.

In the structure of the basic embodiment described above,
When the screw 5 is driven, the rotating shaft 15 is simultaneously rotated by the gear train 14, and the cam key 16 is rotated, whereby the engagement between the cam key 16 and the movable plate 11 directly fitted to the opposite peripheral surface of the rotating shaft 15 is performed. The mating hole 23 (see FIG. 2) is eccentrically rotated, and accordingly, the entire movable plate 11 is swung within a range in which the margin hole 21 of the overhang portion 20a can float around the fulcrum rod 22. In this case, the height of the cam key 16 is set equal to the inner diameter difference between the fixed plate 10 and the movable plate 11, and the difference between the inner diameter of the margin hole 21 and the diameter of the fulcrum rod 21 is set substantially equal to this. The upper edge of the opening 19 of the plate 11 in the lowermost state shown in FIG. 2 coincides with the opening of the fixed plate 10, that is, the upper end of the inner peripheral surface 4 of the filter cylinder. The edge coincides with the opening of the fixed plate 10, that is, the lower end of the inner peripheral surface 4 of the filter cylinder, and does not enter 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 supplied into the filter tube 2. The treated raw water gradually squeezed by the screw 5 in the filter tube 2
The water is squeezed through a filter gap that is constantly (slidably) regenerated between the rocker 1 and the fixed plate 10 by the rocking, radially filtered, drained from the outer periphery, and flows into an appropriate drainage basin (not shown). I do. Thus, the squeezing and dewatering of the treated raw water proceed, and when the dehydrated treated phase continuously reaches the end of the filter tube 2 and rises in pressure, the discharge valve 7 is pushed back and opened to reach the outlet chamber 3. The cake is discharged from the outlet hole 3a.

In the present embodiment, as described above and shown in the drawings, the screw blade is provided with an interruption portion 6, which serves as a pressure varying means. That is, the pressure applied to the treatment phase in the filter tube 2 fluctuates in such a manner that the pressure suddenly decreases in this part 6 and is restored again after this part, thereby increasing the mobility of moisture in the treatment phase. In addition, the filtering and dehydrating functions of the device can be improved.

FIG. 4 shows a second embodiment of the screw press filtration device according to the present invention. The screw pitch is enlarged or shortened in place of the screw blade interruption portion 6 as the pressure fluctuation means shown in FIG. In this case, pitch changing portions 6a and 6b whose pitch is shortened) are provided. Other parts are the same as those of the first embodiment shown in FIGS. 1 to 3, and the same reference numerals are given to the respective parts, and the description will be omitted.

In the second embodiment, the pressure applied to the processing phase in the filter tube 2 also decreases in the pitch change portions 6a and 6b, and changes again in such a manner that the pressure recovers after this portion. The mobility of the water in the phase is increased, and the filtration / dehydration function of the device can be improved.

FIG. 5 shows a third embodiment of the screw press filtration apparatus according to the present invention. Instead of the screw blade interruption section 6 as the pressure fluctuation means shown in FIG. The projections 6a 'and 6b' are provided. Other parts are the same as those of the first embodiment shown in FIGS. 1 to 3, and the same reference numerals are given to the respective parts, and the description will be omitted.

In the third embodiment, the pressure applied to the processing phase in the filter cylinder 2 is controlled by the convex portions 6a 'as pressure varying means.
6b 'increases with decreasing cross-sectional area,
Fluctuation occurs in such a manner as to recover again after passing through this portion, so that the mobility of water in the treatment phase is increased in these portions, and therefore, the filtration / dewatering function of the apparatus can be improved.

FIG. 6 shows a screw press filtration device according to a fourth embodiment of the present invention, specifically, screw pitch variation portions 6a and 6b as pressure variation means shown in FIG.
The shaft protrusions 6a 'and 6b' shown in FIG. 5 are provided alternately. Other parts are the same as those of the first embodiment shown in FIGS. 1 to 3, and the same reference numerals are given to the respective parts, and the description will be omitted.

In the fourth embodiment, the pressure applied to the processing phase in the filter cylinder 2 is reduced in the pitch fluctuation portions 6a and 6b, but the cross-sectional area is small in the convex portions 6a 'and 6b' which are alternately provided. Therefore, the degree of fluctuation increases as a whole. Therefore, the mobility of water in the treatment phase is further increased, and the filtration and dehydration functions of the device can be sufficiently improved.

[0023]

As described above, according to the present invention, the provision of the pressure fluctuation means in the filter tube enhances the mobility of water in the treatment phase, increases the filtration and dewatering ability of the apparatus, and further increases the length of the apparatus. Life can be extended.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing an embodiment of a multi-plate screw press filtration device in a first embodiment.

FIG. 2 is an enlarged sectional view taken along the line AA of FIG. 1;

FIG. 3 is a partially enlarged cross-sectional view taken along a line BB in FIG. 2;

FIG. 4 is a longitudinal sectional view showing an embodiment of a multi-plate screw press filtration device in a second embodiment.

FIG. 5 is a longitudinal sectional view showing an embodiment of a multi-plate screw press filtration device in a third embodiment.

FIG. 6 is a longitudinal sectional view showing an embodiment of a multi-plate screw press filtration device in a fourth embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Inlet chamber 2 Filter tube 3 Outlet room 4 Cylindrical inner peripheral surface 5 Screw 6 Pressure fluctuation means 7 Discharge valve 8a Filter tube start end plate 8b Filter tube end plate 9 Support rod 10 Fixed plate 11 Movable plate 12 Inlet chamber outer end plate 13 Exit Outdoor end plate 14 Gear train 15 Rotary shaft 16 Cam key

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) B30B 9/14 B01D 33/36 C02F 11/12

Claims (4)

[Claims] A) a number of fixed plates each having a central opening; and a number of movable plates having an opening diameter slightly larger than the central opening diameter of the fixed plate and capable of swinging in the same plane. A filter tube having a cylindrical inner peripheral surface which is formed by an alternately superposed array having a fine filtration gap therebetween and which is regulated by an opening of each fixed plate; and b) a screw penetrating the filter tube. C) by providing a mechanism for swinging the movable plate by rotation of the screw, presses and propells the raw water received from one end of the filter tube toward the other end,
A screw press filtration apparatus wherein the filtration gap between the movable plates and each fixed plate is constantly regenerated by swinging the movable plates. D) The raw water pressing force in the filtration tube is increased from one end to the other end. A multi-plate screw press filtration device provided with a pressure changing means for changing the pressure at at least one of the positions. 2. The filtering device according to claim 1, wherein the pressure varying means comprises a break portion of a screw blade. 3. The filtering device according to claim 1, wherein said pressure changing means comprises a pitch changing portion of a screw blade. 4. The filtering device according to claim 1, wherein the pressure varying means comprises a convex portion provided on a screw shaft.