JP3018167B2 - Screw pressure filtration device with load pressure control - Google Patents

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 radially filtering the raw water from the inside of the cylinder to the outside of the cylinder is installed, and a large number of through-holes are arranged 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.

In the above configuration, when the water content of the raw water to be treated is high and the viscosity is low, the amount of filtered water squeezed from between the plates toward the outer periphery of the filter tube increases, but the screw is propelled in the filter tube by the screw. Since the flow of the raw water to be caked is improved, the water content of the cake reaching the outlet chamber may not be sufficiently reduced.

In the outlet chamber, there is provided an outlet control valve which is elastically urged to occupy an opening position corresponding to a load pressure (cake pressure) at the outlet end of the filter tube from a valve closing position for sealing the other end of the filter tube. There is also a configuration to provide, but the load pressure changes immediately according to the retracted position of the control valve that has been retracted and opened by receiving the load pressure, which immediately affects the water squeezing effect between the plates and reduces the water content of the cake. There was the disadvantage of making it unstable.

[0005]

SUMMARY OF THE INVENTION It is a first object of the present invention to provide a screw press type filtration device capable of sufficiently reducing the water content of a discharged cake.

A second object of the present invention is to provide a screw press type filtration device in which the open state of an outlet control valve is controlled in accordance with the load pressure applied to the valve.

[0007]

In order to achieve the first object, the present invention comprises: a) a plurality of annular fixing plates, and having an opening diameter slightly larger than the opening diameter of the fixing plate, according to the difference in the diameters. And a plurality of annular movable plates capable of oscillating at different amplitudes, each of which has an alternately overlapped array with a small filtration gap, and a fixed cylindrical space defined by the row of openings of the fixed plate. B) installing a screw that penetrates the cylindrical space of the filter tube, and b. Providing a mechanism for swinging the movable plate in the same plane by rotation of the screw, whereby the filter tube Screw press type filtration in which treated raw water received from the inlet end is pressed and propelled toward the outlet end, and the gap for filtration between the plates is constantly regenerated by swinging the movable plate. In the apparatus, c) the outlet side of the filter tube is higher than the inlet side
By inclining the angle freely, the load pressure applied to the screw is increased.

To achieve the second object, the present invention provides:
a) a large number of annular fixed plates, and a large number of annular movable 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 diameters, A filter tube is provided, which has an alternating superimposed arrangement with each minute filtration gap, and defines a fixed cylindrical space by the row of openings of the fixed plate; b) penetrating through the cylindrical space of the filter tube By disposing a screw and providing a mechanism for swinging the movable plate by rotation of the screw, the raw water received from the inlet end of the filter tube is pressed and propelled toward the outlet end, and the movable plate is pushed. A filter for constantly regenerating the filtration gap between the plates by the rocking of c), and c) an outlet end connected to the outlet end. An outlet control valve that is supported and driven so as to occupy an open position of the opening corresponding to the load pressure of the filtration tube from a closed position that closes sealed, by detecting the load pressure exerted on the control valve open state of the control valve And a load pressure detection and valve opening control circuit for controlling the load pressure to a desired constant value.

[0009]

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.

As shown in FIG. 1, an embodiment of an inclined screw press type filtration apparatus according to the present invention has an inlet chamber 1, a filter cylinder 2 and an outlet chamber 3 connected from the right, and an inner peripheral surface 4 of the filter cylinder 2. A screw 5 extending through the entire length of the present filtration device from the inlet chamber 1 to the outlet chamber 3 penetrates the cylindrical space surrounded by. An inlet hole 1a for receiving the raw water for treatment is arranged 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, respectively. A drainage basin 6 is located at the bottom of the filter tube 2.
These integrated structures are arranged so as to be inclined such that the angle formed between the axis of the filter cylinder, that is, the axis of the screw 5 and the horizontal plane (ground) is an acute angle α. Numeral 7 is adjusting support means for maintaining the integrated structure at an acute angle α which is preferably adjustable with respect to a horizontal plane. This means can be appropriately configured within the scope of the prior art.

The filter cylinder 2 has a number of annular fixing plates 10 fixed between, for example, four support rods 9 laid between an inlet indoor end plate 8a and an outlet indoor end plate 8b, and the opening of these fixed plates. A large number of annular movable plates 11 having an opening diameter slightly larger than the aperture are arranged alternately in an overlapping arrangement with a small gap for each filtration. The movable plate 11 is formed by a cam mechanism described later in accordance with a difference in diameter from the fixed plate 10. At the same amplitude. In this case, the cylindrical row having the above-described inner peripheral surface 4 is defined by the row of openings of all the fixed plates 10, and the movable plate 11 does not narrow the inner peripheral surface 4 due to its swing. Therefore, the outer edge of the blade 5a of the screw 5 is fitted to the inner peripheral surface 4,
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 are driven by gears or the like. , And is interlocked with another rotating shaft 15 by a gear train 14. The rotating shaft 15 extends from the left end of the apparatus in FIG. 1 to the inlet indoor end plate 8 a located at the right end of the filter tube 2 at the lower portion of the horizontally arranged filter device, and has a cam key 16 that extends in the axial direction within the range of the filter tube 2. This allows the movable plate 11 to swing. This movable plate 11
1 will be better understood with reference to FIG. 2 which is drawn along the line AA of FIG.

As is apparent from FIG. 2, the fixed plate 10 has a perfect annular shape having an outer periphery forming the outer peripheral surface of the filter tube 2 and an opening coplanar with the inner peripheral surface 4 of the cylinder. Of each plate 1
Numerals 0 are maintained at an interval from each other by a spacer 17 made of a small disk that is also penetrated and supported by the support rod 9. On the other hand, the movable plate 11 has a recess 18 surrounding the spacer 17 with a margin. The outer periphery is slightly smaller than the fixed plate 10, and the opening 19 has a diameter slightly larger than the opening of the fixed plate 10 (the cylindrical inner peripheral surface 4). It has an annular shape, and a margin hole 20a and an engagement hole 20b are respectively formed in upper and lower portions thereof. A fulcrum rod 21 is loosely fitted in the upper margin hole 20a, and the above-described rotary shaft 15 is fitted in the lower engagement hole 20b. By doing so, it is supported and driven. The fulcrum rod 21 is provided between the inner end plates 8a and 8b so as to occupy a position axially symmetric with the rotation shaft 15 in the filter cylinder 2.

As can be seen with reference to FIG. 3, which is drawn along the line BB in FIG. 2 and enlarged, the spacer 17 in the recess 18 has a thickness which sets the spacing between the fixing plates 10, 10. In this case, by having a thickness slightly larger than the thickness of the movable plate 11, a minute filtration gap is formed between the plates 10 and 11, and thus a large number of plates 1 are formed.
The filter cylinder 2 (FIG. 1) having the arrangement of 0 and 11 is completed.

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, so that the small size of the movable plate 11 directly fitted on the opposite peripheral surface of the cam key 16 and the rotating shaft 15. The hole 20b (see FIG. 2) is eccentrically rotated, and accordingly, the entire movable plate 11 swings in a range where the upper small hole 20a can freely move around the fulcrum rod 21. 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 small hole 20a and the diameter of the fulcrum rod 21 is set substantially equal to this. In the lowermost state shown in FIG. 2, the upper edge of the opening 19 of the plate 11 coincides with the opening of the fixed plate 10, that is, the upper end of the inner peripheral surface 4 of the filter cylinder.
In the uppermost state in which the rotating shaft 15 rotates half a turn, the lower edge coincides with the opening of the fixed plate 10, that is, the lower end of the inner circumferential surface 4 of the filtering tube, and the inner side of the inner circumferential surface 4 of the filtering tube during one rotation of the rotating shaft 15. Do not invade.

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
Due to the rocking of 1, it is radially filtered through a filtering gap that is constantly (slidably) regenerated between it and the fixed plate 10, is discharged from the outer periphery, flows down, and flows into the drainage basin 6. The cake reaching the outlet chamber 3 is discharged from the outlet hole 3a by the squeezing and dewatering of the treated raw water.

In the inclined screw press type filtration apparatus of the present invention, even if the concentration of suspended fine particles in the raw water to be treated is relatively low and thus the viscosity is low, the inside of the filtration cylinder 2 is not sufficiently filtered and squeezed out of the water. Propelled by the screw 5, it is possible to avoid that the treated raw water reaches the outlet chamber 3 in a manner that is almost straight. That is, when the introduced raw water reaches the entire length of the filter tube 2 and the outlet chamber 3, the filter tube 2 and the like are inclined so that the outlet side becomes higher. The closer the raw water is, the more strongly pressurized from the outlet side, the more the filtration from the filtration gap between the plates 10 and 11
Water is promoted. If the specific gravity of the suspended particulates in the treated raw water is sufficiently lighter than water, the suspended particulates are gradually floated in the inclined cylinder, and above the substantial water surface formed according to the moisture content at the outlet side. As a result, the water content of the cake discharged from the outlet hole 3a can be reduced.

FIG. 4 shows an embodiment of the load pressure detecting and controlling screw press type filtration device according to the present invention, in which there is no inclination as in the filtration device shown in FIG. 1 and FIG. There is no adjustment support means 7 for the angle α. In this embodiment, an outlet control valve 22 for opening and closing the outlet end of the filter tube 2 is disposed in a relatively large outlet chamber 3 ′,
For example, the piston rods 24a, 24b of a pair of hydraulic cylinders 23a, 23b located outside the outlet chamber 3 '
To support and drive. Therefore, although the piston rods 24a and 24b slidably penetrate the outer end wall 13 ', there is no room for penetrating and supporting other shafts and the like. It is applied and enables the driving of the screw and the swinging of the movable plate similar to the embodiment shown in FIG. The hydraulic cylinders 23a and 23b are driven by a hydraulic circuit 25 generated from a hydraulic pump P,
Is a controller 27 that generates an output in accordance with a difference between a detection output of a hydraulic pressure gauge 26 attached to the hydraulic circuit 25 and a set pressure.
Is controlled by

In this embodiment, the outlet control valve 22 is kept closed until the head of the treated raw water reaches the outlet end of the filter tube 2 and is sufficiently pressurized. When the pressure applied to the outlet control valve 22 exceeds a predetermined value, the valve 22 opens and the cake formed by dehydration from the treated raw water is discharged through the outlet chamber 3 ′. This leads to a decrease, with a corresponding change in the water content of the cake. However, according to the pressure detection and control function of the present invention, the outlet end pressure of the treated raw water (this is defined as the load pressure) is measured by the pressure gauge 2.
6, the positions of the hydraulic cylinders 23a and 23b, and thus the control valve 22, are controlled to an arbitrary set pressure via the controller 27, and the water content of the cake is kept substantially constant.

[0020]

As described above, according to the present invention, the filtration dehydration function is enhanced by inclining the filtration tube or by configuring a screw press type filtration device with an outlet valve having load pressure detection and control functions. Thus, the moisture content of the finished cake can be kept low and constant.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing an embodiment of an inclined screw press type filtration device.

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 longitudinal sectional view showing an embodiment of a screw press type filtration device with an outlet valve having a load pressure detection and control circuit.

[Description of Signs] 1 Inlet chamber 2 Filter tube 3 Outlet chamber 4 Cylindrical inner peripheral surface 5 Screw 6 Drainage basin 7 Adjusting and supporting means of angle α 8a Inlet indoor end plate 8b Outlet indoor end plate 9 Support rod 10 Fixed plate 11 Movable Plate 12 Inlet outdoor end plate 13 Outlet outdoor end plate 14 Gear train 15 Rotating shaft 16 Cam key 17 Spacer 18 Concave 19 Opening of movable plate 20a Extra hole 20b Engagement hole 21 Support rod 22 Exit control valve

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification code FI B01D 33/27 B01D 33/38 33/44 33/58 33/70 37/04 (58) Investigation field (Int.Cl. ⁷ , DB name) B01D 33/00-33/82

Claims (1)

(57) [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. A filter tube having an alternately overlapped arrangement with a movable plate and having a fine filtration gap therebetween, wherein a filter tube having a fixed cylindrical space defined by an opening row of the fixed plate is installed; b) a tube of the filter tube By disposing a screw penetrating the cylindrical space and providing a mechanism for swinging the movable plate by the rotation of this screw, the treated raw water received from the inlet end of the filter tube is pressed and propelled toward the outlet end. A screw press-type filtration device wherein the filtration gap between the plates is constantly regenerated by swinging the movable plate; and c) the outlet side of the filter tube is closer to the inlet side. In such a way that the higher
A load pressure control type screw press type filtration device characterized in that a load pressure applied to a screw is increased by inclining the angle freely .