JP2005199171A - Solid-liquid separator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a solid-liquid separator in which no clogging in filtrate discharging slits is caused, whose maintenance is easy, which has superior durability, and whose running cost is low. <P>SOLUTION: A lot of outer rings 21 and inner rings 22 are alternately arranged around a screw conveyer 3 so as to surround the conveyer 3 rotatably disposed, by providing specified spaces to form the filtrate discharge slits 2a between the respective rings 21 and 22. The outer rings 21 and inner rings 22 are integrally connected respectively, and are connected to driving mechanisms 7, 8, to make the outer rings 21 and inner rings 22 reciprocatingly turn in a reverse direction to each other. By this configuration, water in sludge transferred by the screw conveyer 3 is continuously discharged through the slits 2a to the outside, shearing force is applied to solid intruded into the slits 2a, the solid is not retained inside, and clogging is not caused. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a solid-liquid separator for removing moisture from sludge-like sludge.

  Wastewater discharged from households and the like is generally treated with sludge with a large amount of water separated by water treatment, and this sludge is further dehydrated by a solid-liquid separator and treated as sludge with reduced water content.

  Here, conventionally, as a solid-liquid separation device used for this type of purpose, a feed shaft is provided on the inner surface of a screen drum that is rotatably mounted horizontally, and a feed blade wound around the outer periphery thereof is brought close to the screen drum. The raw liquid supplied to one end of the screen drum is filtered under pressure while being transported to the other end by the rotation of the feed shaft, and the water content of the treated sludge is adjusted by controlling the rotation of the screen drum in the reverse direction. There was something to do. In addition, in the solid-liquid separation device using this type of screen drum, clogging of the screen drum is unavoidable.Therefore, a plurality of washing nozzles are provided in a row along the screen drum, and if necessary, Or, regularly, high-pressure water is jetted from the washing nozzle to remove the solid matter clogged in the filtrate discharge gap provided in the screen drum. (For example, refer to Patent Document 1).

In addition to this, a screen drum provided around a screw conveyor for sludge conveyance is provided with a plurality of fixing rings connected with a predetermined gap and a plurality of holding rings movably held between the fixing rings. It consists of an idle ring and drains the moisture contained in the sludge conveyed by the screw conveyor from the minute gap between the fixed ring and the idle ring, and the idle ring is fixed by the rotation of the screw conveyor at this time. Some of them were slid in the radial direction of the ring to prevent clogging of the minute gap. (For example, refer to Patent Document 2).
Japanese Patent Publication No. 7-57428 (2nd page, Fig. 1) Japanese Examined Patent Publication No. 7-10440 (page 2-4, FIG. 4)

  Among the conventional solid-liquid separators described above, the former using the screen drum cannot avoid clogging of the screen drum. Therefore, a large number of washing nozzles must be provided along the screen drum. However, there is a problem that the apparatus becomes large and the manufacturing cost thereof increases. In addition, since high-pressure water is periodically ejected from the cleaning nozzle, a large amount of cleaning water is required, and the apparatus operating rate is lowered and the running cost is increased.

  In addition, the latter, which comprises a screen drum with a fixed ring and an idle ring, is driven in the circumferential direction with the rotation of the screw conveyor, so that the clogging of the gap is prevented. However, there is no need for washing, but on the other hand, the idle ring is slidably contacted with the outer peripheral end of the spiral blade of the screw conveyor, so that it is pushed outward. There was a problem that driving force was required and energy utilization efficiency was poor. In addition, the screw conveyor and the idle ring are easily worn out by this sliding contact, and there is a risk of being damaged, and there is a problem in durability, and there is a problem that a lot of time is required for parts replacement and maintenance for maintaining the function. Had.

  An object of the present invention is to solve the problems of the conventional solid-liquid separator.

  In order to solve the above-mentioned problems, among the present inventions, the invention according to claim 1 is characterized in that a plurality of outer rings arranged in an axial direction and spaced apart from each other and integrally connected, and the outer rings A plurality of inner rings which are arranged between the outer rings with a predetermined gap and are integrally connected, and a screw conveyor which is rotatably arranged inside the plurality of outer rings and the inner rings. In the solid-liquid separation device provided, the outer ring and the inner ring are connected to different drive mechanisms so as to be rotatable, and the two are reciprocally rotated in opposite directions to form a filtrate discharge slit formed between the two rings. It is characterized by preventing solid matter from adhering and clogging.

  The invention according to claim 2 adds a configuration in which the gap between the outer ring and the inner ring is gradually narrowed along the conveying direction of the screw conveyor to the configuration of the invention according to claim 1 above. It is characterized by.

  The invention described in claim 3 is transported by limiting the screw conveyor in the configuration of the invention described in claim 1 above as the rotational axis of the screw conveyor is gradually enlarged in the conveying direction of the screw conveyor. The squeezing force is applied to the sludge.

  In the present invention, a filtrate discharge slit is formed by the alternately arranged outer ring and inner ring, and the outer ring and the inner ring are reciprocated in opposite directions by another drive mechanism. Since it is made to rotate, clogging of the slit can be prevented without sliding the ring or screw conveyor. Therefore, there is no difficulty in driving, it can be operated with a driving force smaller than the conventional one, and the use efficiency of energy is increased, so that the running cost is reduced. In addition, since there is no possibility of parts being worn away or damaged by sliding contact, the durability of the apparatus is improved, the maintenance work is reduced, and the running cost is reduced from this aspect. .

  In the invention according to claim 2, since the gap between the outer ring and the inner ring is gradually narrowed along the conveying direction of the screw conveyor, it is possible to efficiently remove the sludge whose moisture content has decreased along with the conveying. There is an effect that moisture is removed.

  In the invention according to claim 3, since the diameter of the rotation axis of the screw conveyor is gradually increased in the conveying direction of the screw conveyor, the squeezing force is gradually increased against the sludge whose moisture content has decreased with the conveyance. Thus, there is an effect that the solid-liquid separation is efficiently performed according to the change in the moisture content of the treated sludge.

  Hereinafter, the present invention will be described in detail based on illustrated embodiments.

  FIG. 1 is a simplified longitudinal sectional view showing an embodiment of the solid-liquid separation device of the present invention, FIG. 2 is an enlarged transverse sectional view of an essential part thereof, and FIG. 4 is a right side view of FIG. As shown in the figure, this solid-liquid separation device is configured such that a screw conveyor 3 is rotatably mounted in a cylindrical casing 1 installed on an inclination on a gantry 6 and surrounds the screw conveyor 3. A cylindrical screen member 2 is arranged, and drive mechanisms 7 and 8 of an outer ring 21 and an inner ring 22 described later are provided at both ends of the casing 1, and cams of the drive mechanisms 7 and 8 (FIG. 5). (Indicated by reference numeral 81) is integrally fixed to the rotating shaft 3 c of the screw conveyor 3 and is driven to rotate together by the motor 5.

  Further, a sludge inlet 1a is provided on the upper side of the casing 1 on one side (left side in FIG. 1), and the filtrate separated from the sludge is discharged at the bottom of the casing at the lower side of the inlet 1a. A discharge port 1b is provided on the other side (right side in FIG. 1) of the casing 1, and a dewatered sludge discharge port 1c is provided. A back pressure plate 4 is provided inside the discharge port 1c to apply a certain pressure to the sludge sent out by the screw conveyor 3 and adjust the moisture content of the sludge taken out.

  Here, in the solid-liquid separation device of the present invention, the screen member 2 is configured by arranging a large number of outer rings 21 and inner rings 22 alternately as shown in FIG. A filtrate discharge slit (indicated by C in FIG. 3) is formed between the inner ring 22 and the inner ring 22.

  Both the outer ring 21 and the inner ring 22 are formed in an annular shape having an inner diameter slightly larger than the outer diameter of the blade 3b of the screw conveyor 3, and a rod (as shown in FIG. Protrusions 21a and 22a are provided for inserting the rings 21 (or 22) of the same type through the passages (indicated by reference numerals 10 and 11 in FIG. 5). Therefore, the protrusions 21a and 22a are provided at different positions on the outer ring 21 and the inner ring 22 so that the rod 10 connecting the outer rings 21 and the rod 11 connecting the inner rings 22 do not interfere with each other. It has been. Further, a spacer 9 is inserted in the rod 10 (or 11) between the adjacent rings 21 and 21 (or 22 and 22), and the space between the outer ring 21 and the inner ring 22 is as shown in FIG. A predetermined gap C serving as a filtrate discharge slit 2a is formed. The spacer 9 has a gap C of the filtrate discharge slit 2a formed between the outer ring 21 and the inner ring 22 in the conveying direction of the screw conveyor 3 (right direction in FIG. 2) as shown in FIG. Along the lines, the thickness gradually decreases so as to be gradually narrowed to 0.5 mm, 0.3 mm, 0.2 mm, and 0.15 mm.

  Both ends of the rods 10 and 11 are connected to drive mechanisms 7 and 8 provided at both ends of the rotary shaft 3 c of the screw conveyor 3. The drive mechanisms 7 and 8 are provided on both sides of the rotating shaft 3c oppositely, that is, in plane symmetry. Accordingly, the structure of the drive mechanism 8 on one side will be described as an example. This drive mechanism 8 is fixed to the rotating shaft 3c of the screw conveyor 3 and rotates together with the screw conveyor 3 as shown in the exploded perspective view of FIG. Disc-shaped cam 81, levers 84 and 85 reciprocally driven by cam followers 90 and 91 engaged with cam groove 81a of cam 81, and arms 86 and 87 coupled to levers 84 and 85, And drive rings 82 and 83 connected to the arms 86 and 87 and driven to reciprocate in the direction of rotation. The drive rings 82 and 83 have the same shape as the outer ring 21 or the inner ring 22 described above, and the ring 21 (or 22) having the same shape is connected to a projecting portion 82a (or 83a) protruding on the outer periphery. The end of the rod 10 (or 11) is fixed to prevent it from coming off. Further, a ball bearing 96 is attached to the rods 10 and 11 so that the outer periphery protrudes outward from the protrusions 82a and 83a. The ball bearing 96 is in contact with a bearing guide 100 provided in the periphery thereof. Thus, the drive rings 82 and 83 are smoothly rotated and guided.

  Here, the lever 85 for driving the drive ring 83 connected to the outer ring 21 and the lever 84 for driving the drive ring 82 connected to the inner ring 22 are provided symmetrically with respect to the cam 81. Therefore, the arms 87 (or 86) connected to the respective levers 85 (or 84) are driven to reciprocate up and down synchronously, and the drive rings 83 and 82 connected to the arms 87 and 86 are mutually connected. It is designed to rotate in the opposite direction.

  Although the screw conveyor 3 is a conventionally well-known thing in which the blade | wing 3b was provided helically around the rotating shaft 3c, in the screw conveyor 3 used for this invention, the rotating shaft 3a is the conveyance direction of the screw conveyor 3. The diameter gradually increases toward the upper right (in FIG. 1 diagonally upward).

  The solid-liquid separation device of the present invention has the above-described configuration.

  In FIG. 5, reference numerals 88 and 89 are fulcrum brackets that pivotally support one side of the arms 84 and 85, 97, 98, and 99 are collars, and 92 and 93 are engaged with grooves 86a and 87a at the lower ends of the arms 86 and 87. The ring side cam followers 94 and 95 indicate brackets for fixing the cam followers 92 and 93 to the drive rings 82 and 83, respectively.

  Reference numeral 101 denotes a nut for fixing the ends of the rods 10 and 11 to holes provided in the protrusions 82a and 83a of the drive rings 82 and 83, and reference numeral 102 denotes a bolt for fixing the brackets 94 and 95. Show.

  Next, a series of operations of the solid-liquid separation device of the present invention having the above-described configuration will be described. First, when sludge (not shown) is introduced into the casing 1 from the inlet 1a provided on the upper part of one side of the casing 1, The introduced sludge with a large amount of water is sequentially fed into the cylindrical screen member 2 constituted by the outer ring 21 and the inner ring 22 by the screw conveyor 3 and moves inside the screen member 2. By the pumping force, the contained moisture is discharged to the outside from the filtrate drain slit 2a between the outer ring 21 and the inner ring 22, and the dewatered sludge is discharged from the discharge port 1c.

  At this time, in the solid-liquid separation device of the present invention, the rotational axis 3a of the screw conveyor 3 gradually increases in diameter in the sludge conveying direction, and the back provided on the outlet side (right side in FIG. 1). A strong squeezing force acts on the sludge transported in combination with the action of the pressure plate 4, and the filtrate drain slit 2 a provided on the screen member 2 also has a gap in a stepwise manner along the transport direction. Therefore, the solid content of the sludge is less likely to be pushed out from the filtrate drain slit 2a, and the solid-liquid separation is efficiently performed.

  In this solid-liquid separation, in the solid-liquid separation device of the present invention, the outer ring 21 and the inner ring 22 constituting the screen member 2 are reciprocally driven by the drive mechanisms 7 and 8 so as to rotate in opposite directions. Therefore, even if the solid content of sludge enters the filtrate drain slit 2a formed between the outer ring 21 and the inner ring 22, a shearing force acts on the solid content and is pushed out. Coupled with the pressure of the filtrate, there is no risk of clogging by being quickly pushed out of the filtrate drain slit 2a and staying inside or adhering to the inside. Therefore, the function deterioration due to the clogging of the slit 2a does not occur, and the maintenance work is unnecessary.

  The filtrate discharged from the filtrate drain slit 2a of the screen member 2 flows through the inside of the casing 1 to the discharge port 1b, and is discharged from the discharge port 1b to the outside.

It is the simple longitudinal section showing the embodiment of the solid-liquid separation device of the present invention. FIG. 2 is an enlarged cross-sectional view of a main part of the solid-liquid separator shown in FIG. 1. FIG. 3 is an enlarged view of a main part of FIG. 2. FIG. 3 is a right side view of FIG. 2. It is a disassembled perspective view of a drive mechanism. It is a disassembled perspective view of a screen member.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Casing 1a Inlet 1b, 1c Outlet 2 Screen member 3 Screw conveyor 3a Rotating shaft center 3b Blade 3c Rotating shaft 4 Back pressure plate 5 Motor 6 Base 7, 8 Drive mechanism 9 Spacer 10, 11 Rod 21 Outer ring 21a Projection 22 Inner ring 22a Protrusion 81 Cam 81a Cam groove 82, 83 Drive ring 84, 85 Lever 86, 87 Arm 88, 89 Bracket for fulcrum 90, 91, 92, 93 Cam follower 94, 95 Mounting bracket 96 Ball bearing 97, 98 , 99 Color 100 Bearing guide

Claims (3)

A plurality of outer rings arranged in an axial direction with a space between them and integrally connected to each other, and arranged between each outer ring with a predetermined gap with the outer rings, and integrally connected In the solid-liquid separation device comprising a plurality of inner rings and a screw conveyor rotatably arranged inside the plurality of outer rings and inner rings,
The outer ring and the inner ring are connected to different drive mechanisms so as to be rotatable, and are reciprocally rotated in opposite directions, thereby clogging due to solid content adhering to the filtrate discharge slit formed between the two rings. A solid-liquid separator characterized in that the liquid is prevented. 2. The solid-liquid separator according to claim 1, wherein the gap between the outer ring and the inner ring is gradually narrowed along the conveying direction of the screw conveyor. 2. The solid-liquid separation according to claim 1, wherein the rotation axis of the screw conveyor is gradually expanded in diameter toward the conveying direction of the screw conveyor so that the squeezing force acts on the conveyed sludge. apparatus.

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