JPS6019012A - Screw type filtering method and apparatus thereof - Google Patents

Abstract

PURPOSE:To also efficiently perform the filtering of a low conc. suspension, by performing filtering while regenerating filtering gaps mutually formed between suspended fine particles by moving said suspended fine particles adhered to the inner peripheral surface of a filter body by the reciprocating motion of a movable plate. CONSTITUTION:A suspension is supplied into a filter tank 1 from a suspension supply port 2 and a screw 13 for transferring suspended fine particles while a filtrate is discharged to the outside from permeation orifices 4 provided to the peripheral surface of the filter tank 1. On the other hand, suspended fine particles adhered and laminated to the inner peripheral surface of a filter body 5 are always moved by a reciprocating movable plate 7 and filtering is allowed to advance while filtering orifices between fine particles are always regenerated while suspended fine particles are continuously sent forwardly by the screw 21 and discharged from a discharge port 3 as a sufficiently pressurized and dehydrated cake.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a screw sieve method and apparatus for filtering a suspension containing suspended fine particles and separating both liquids and suspended fine particles. be.

(Prior art) Suspended particles and filtrate are separated by supplying a suspension liquid to the center hole of a filter body made by stacking and fixing a large number of annular filter plates, and discharging the filtrate to the outside through the slits in the opening of each filter plate. A filtration device that separates the filtration system and the filtration system has already been put into practical use; There were problems in that the filtration accuracy was poor and it could not be operated for a long time.

(Object of the Invention) The present invention was completed with the aim of solving the above-mentioned problems and providing a screw set filtration method and device that can efficiently filter low-concentration suspensions. .

(Structure of the Invention) The present invention includes a plurality of annular filtration plates arranged at required intervals, and a movable plate interposed between each filtration plate to form a slit between each filtration plate. A screw is provided in the center hole of the cylindrical filter body formed by the above, and while driving the screw, the suspension is supplied from one end of the center hole where discharge from the outlet side opening is restricted. The suspended fine particle layer attached to the inner peripheral surface of the filter body is moved by the movable plate, and the filtrate is regenerated while regenerating the filtration slits between the suspended fine particles forming the suspended fine particle layer. The particles are removed from the outer periphery of the filter body through the gap between the filter plate and the movable plate, and the suspended particles deposited in the center hole of the filter body are moved to the other end using a screw to form a cake after pressure dehydration. A first invention characterized in that the cake is discharged from the other end of the central hole, and a large number of through holes are arranged in a curved shape, and a suspension supply port and a suspended fine particle discharge port are provided at the end. A cylindrical filter body consisting of a large number of annular filtration plates and an annular movable plate interposed between each filtration plate via a spacer is provided inside the filtration tank provided with the filtration tank. A screw is provided in the central hole of the body to transport the suspended particles deposited therein toward the discharge port, and an opening on the discharge port side of the central hole is provided with a screw for transporting the suspended particles deposited therein toward the discharge port. According to the second aspect of the present invention, a discharge valve is provided for restricting the discharge of the liquid.

(Embodiment) Next, the present invention will be explained in detail with reference to the illustrated embodiment. In (1), the suspension supply port (2) is provided on the negative side, and the suspended particulate discharge port (3) is provided on the other side. It is a horizontal cylindrical filtration tank provided on the side, and the periphery of the filtration tank (1) is provided with a large number of through holes (4) for discharging one liquid, and the inside of the filtration tank (1) is is provided with a cylindrical filter body (5) which will be described later. This filter body (5) includes an annular filter plate (6) made of a thin metal plate such as a stainless steel plate, a movable plate (7) having a smaller diameter than the filter flute (6), and an intervening plate (6). and an annular spacer (8) that is slightly thicker than the movable plate (7), and multiple poles inserted through the filtration grate (6) and spacer (8). Fixed plate Qυ, (
2), and the movable plate (7) is connected to each filtration plate with a spacer (8) between the filtration plates (6) arranged at a required interval between the fixed plate Qυ and (2). It is movably interposed with a gap formed between it and the plate (6), and is fixed inside the filtration tank (1) using the fixing plates 0υ, a4. a3 is the filter tank (
1) is a screw for transporting suspended particulates provided in the center hole (9) of the filter body (5) in the inside, the screw blades of the screw a3 are formed such that the pitch becomes smaller as it goes from one end to the other end, The outlet side opening of the center hole (9) at the other end of the screw 03 is normally sealed with a discharge valve (J4) that is spring-loaded by a spring OQ. When the discharge pressure of the suspended particles in the hole (9) reaches a certain level or higher, the seal by the discharge valve 04) is released and the pressure-dehydrated cake is discharged from the discharge port (3). ing. Note that this discharge valve 04) is for restricting the discharge of suspended particles in the central hole (9), and is not necessarily necessary if the discharge port side opening is narrowed.

With this configuration, if the suspension is supplied from the suspension supply port (2) into the filtration tank (1) and the screw a3 for transferring suspended particles is rotated, the suspension can be is transferred by screw 0■, and the annular filter plate (6) provided on the outer periphery and the annular movable plate (
7) and cylindrical filter bodies (5) that are stacked alternately, this filtration is mainly carried out by filter bodies (5)
The filtrate flows through the slit between the brake 1- (6) and the movable plate (7) into the filtration tank (1).
It is discharged to the outside through a through hole (4) provided in the circular surface of the cylinder.

In this way, as filtration progresses, the filtration plate (
6) and a movable plate (7).
) Suspended particles gradually adhere to the inner circumferential surface of the filter, and filtration is performed by passing through the filtration gaps between the suspended particles forming this suspended particle layer. The rotation of the screw α4 causes local pressure fluctuations on the inner circumferential surface of the filter body (5), and frictional force is generated between the suspended particles transferred by the screw 0 and the movable plate (7). , the movable grate (7) causes floating rotation when the filter plates (6) and (6) are open due to these forces, and the suspended fine particles adhered and stacked on the inner circumferential surface of the 1-mi filter (5) move due to the free movement of the movable plate. (7), and the filtration holes between the particles are constantly regenerated as the filtration progresses. Therefore, the inner peripheral surface of the filter body (5) is not clogged and can be operated continuously for a long time. is possible. Moreover, since the discharge port side opening of the center hole (9) is normally sealed with a discharge valve 04) to restrict discharge, the suspended particulates concentrated in the center hole (9) is transferred while being gradually pressurized and dehydrated by the Kuriyu 01 whose pitch becomes smaller toward the tip, and accumulates below the discharge valve 0 (material). Since the turbid particles are continuously fed in by the screw IJ knee 03, the pressure at the tip of the screw 03 gradually increases, and sufficient dehydration is carried out here, and this pressure exceeds the pressing force of the spring αQ. When it becomes large, the discharge valve 04) opens and the sufficiently pressurized and dehydrated cake is discharged from the discharge port (3), which has an excellent dehydration effect as well as a clogging prevention effect. It is suitable for filtering suspensions with relatively low concentrations. Figure 1 shows a second embodiment of the device of the present invention, in which unevenness (2) is formed on the inner circumferential surfaces of the filter plate (6) and the movable plate (7). (c) has the effect of violently agitating the flow of the suspension on the inner circumferential surface of the filter body (5), thereby moving the suspended fine particles adhering to the inner circumferential surface of the filter body (5) more violently, and The unevenness (C) on the inner peripheral surface of the movable plate (7) promotes the free movement of the movable plate (7) by increasing the frictional force between the suspension transferred by the screw Q3 and the movable plate (7). The unevenness (A) may be parallel to the axis of the screw a, but the flow pressure of the suspension can be controlled by the movable plate (7).
It may be tilted with respect to the axis of the screw so that it can be effectively converted into rotational force. Furthermore, Section S
The figure shows a third embodiment of the present invention.
By tilting the feed vane forward, the suspension can be transferred more efficiently by the rotation of the screw, and the dewatering effect can be further improved.

(Effects of the Invention) As is clear from the above description, according to the first invention, suspended fine particles attached to the inner circumferential surface of a filter body made up of a filter plate and a movable plate and between each filter plate and the movable plate. is moved by the movement of this movable grate, and filtration is performed while regenerating the fine gaps between each suspended fine particle.Therefore, unlike conventional methods, suspended fine particles are not mixed into the sieve residue, and the precision is improved. In addition to good sowing, the suspension can be filtered for a long time without the risk of clogging, and the concentrated suspended particles are compressed into a cake-like form within the center hole of the filter. It has the advantage of being drained after being dehydrated. In the second invention, a special filter body with movable plates interposed between a plurality of filter plates and a screw are provided in the filtration tank.

Both have a simple structure in which only a meeting point is provided at the outlet side opening of the central hole of this filter body, but the suspension is filtered with high filtration accuracy for a long period of time and discharged as a cake. This is a screw filtration method and device that solves the problems of conventional suspension filtration, and will greatly contribute to the development of the industry.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway front view showing a first embodiment of the device of the present invention, Fig. 2 is a partially cutaway side view, Fig. 3 is a view taken along arrow A-A in Fig. 2, and Fig. μ. 1 is a partially cutaway side view showing a second embodiment of the device of the present invention, and FIG. J is a partially cutaway front view showing a third embodiment of the device of the present invention. (1) Two filtration tanks, (2): Suspension supply port, (3): Suspended particulate discharge port, (4): Through hole, (5): Secondary body, (6
): Filter plate, (7): Movable plate, (8) Varnish spacer, (9): Center hole, α Niscrew, a4)
: Discharge valve. Patent applicant: Nippon Insulators Co., Ltd. Figure 1

Claims (1)

[Claims] / A movable plate 1 which is interposed between a large number of annular filter plates arranged at required intervals and is interposed between each filter plate to form a slit between each filter plate. - A screw is provided in the center hole of the cylindrical filter body formed by and, and while driving the screw, the suspension is discharged from one end of the center hole where discharge from the outlet side opening is restricted. The suspended fine particle layer that is supplied and adhered to the inner circumferential surface of the filter body is moved by the movable plate to regenerate the gaps between each suspended fine particle forming the suspended fine particle layer. At the same time, the fighting liquid is removed from the outer periphery of the filter body through the gap between the filter plate and the movable plate, and the suspended particles deposited in the center hole of the filter body are moved to the other end by the screw and turned into a cake shape. 1. A screw method for acid quantification, which comprises discharging the cake from the other end of the central hole after pressurized dehydration. ! Inside the filter tank (1), a large number of through holes (4) are arranged on the circumferential surface, and a suspension supply port (2) and a suspended particulate discharge port (3) are provided at the end. annular filter plate)
(6) and each passing plate (6), spacer (
A cylindrical filter body (5) consisting of an annular movable plate (7) interposed therebetween is provided, and the filter body (
The central hole (9) of the center hole (9) is provided with a screw for transporting the suspended fine particles deposited therein toward the discharge port (3), - A screw filtration device characterized in that the IO side opening is provided with a discharge valve 04) for restricting the discharge of suspended particles in the central hole (9).