JP2826991B2 - Solid-liquid separator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plurality of fixed rings which are arranged in the axial direction with a gap therebetween, and are integrally fixed, and a floating ring movably disposed in the gap between the fixed rings. A ring, a screw conveyor disposed in the internal space of the cylindrical body formed by the plurality of fixing rings and the plurality of floating rings, and extending in the axial direction of the cylindrical body, the screw conveyor including By rotating around the central axis, the processing target containing a large amount of water flowing into the internal space of the cylindrical body from the inlet opening at one end side in the axial direction of the cylindrical body, the axis of the cylindrical body Moving toward the outlet opening on the other end side in the direction,
At this time, the water in the object to be processed is discharged outside the cylindrical body through a minute gap between each fixed ring and the floating ring,
The object to be treated having a reduced water content is discharged from the outlet opening of the cylindrical body, and the inner diameter of each floating ring is set on the screw conveyor so that each floating ring moves relative to the fixed ring by the rotation of the screw conveyor. And a solid-liquid separator set smaller than the outer diameter of the solid-liquid separator.

[0002]

2. Description of the Related Art A solid-liquid separation apparatus of the above type for separating water from an object containing a large amount of water can be widely used for sludge treatment, sludge dredging, paper making, surimi and tofu food processing, and the like. It is conventionally known as such (see Japanese Patent Publication No. 7-10440).

[0003] In this type of solid-liquid separation device, the idle ring disposed between the fixed rings can be positively actuated by the rotation of the screw conveyor, so that the minute gap between the fixed ring and the idle ring is reduced. The solids that have entered can be efficiently discharged out of the gap, thereby preventing clogging of the gap.

When a solid-liquid separator of this type is used as a dehydrator, it is desirable to increase the function of separating water from the object to be treated, that is, the dehydration efficiency as much as possible. As an effective means for achieving this object, there is a method of gradually increasing the pressure applied to the processing object in the cylindrical body from the inlet opening side to the outlet opening side of the cylindrical body.
The pressure exerted on the object to be treated introduced into the cylindrical body,
As it moves to the outlet opening of the cylindrical body, it gradually increases. With this configuration, it is possible to improve the dewatering efficiency of the object to be processed as follows.

[0005] In the initial stage when the object to be treated flows into the cylindrical body, the pressure applied to the object to be treated is not so large, but the object to be treated at this time contains a large amount of water. Therefore, water can be efficiently separated from the object to be processed, and can be dropped downward through a minute gap between the fixing ring and the floating ring. On the other hand, as the processing object moving in the cylindrical body approaches the outlet opening, the amount of water contained therein decreases, so that it becomes difficult to separate the water. By applying a large pressure, the dewatering efficiency can be increased. In this way, it is possible to increase the dewatering efficiency in all the steps during which the processing target moves from the inlet opening to the outlet opening of the cylindrical body.

However, according to studies by the present inventor, improvement of dewatering efficiency with respect to an object to be treated is limited by the above-described structure alone.
It has been found that it is difficult to further improve the dewatering efficiency.

[0007]

DISCLOSURE OF THE INVENTION The present invention has been made based on the above-mentioned recognition, and an object of the present invention is to provide a dehydration efficiency with respect to an object to be treated which can be significantly improved as compared with the related art. Another object of the present invention is to provide a solid-liquid separation device of the above type.

[0008]

According to the present invention, in order to achieve the above object, in a solid-liquid separation apparatus of the type described at the outset, the pressure applied to the object to be treated in the cylindrical body is controlled by the inlet of the cylindrical body. Pressure adjusting means for gradually increasing from the opening side to the outlet opening side is provided, and the screw conveyor is provided on the first and second conveyors located on the upstream side and the downstream side, respectively, with respect to the moving direction of the processing target in the cylindrical body. Each of the first and second conveyors is rotationally driven such that the first conveyor positioned on the upstream side in the moving direction of the object to be processed rotates at a higher speed than the second conveyor positioned on the downstream side thereof. A solid-liquid separation device characterized by providing a driving means for performing the above-mentioned operation is proposed.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to the drawings, and the reason why there is a limit to the improvement of the dewatering efficiency with respect to an object to be treated by a conventional solid-liquid separation apparatus will be described with reference to the drawings. And clarify more specifically.

FIG. 1 shows a method of treating a large amount of wastewater discharged from a general household, a food processing plant, a pig farm or a hotel,
It is a longitudinal cross-sectional view which shows an example of the solid-liquid separation apparatus comprised as a dehydrator which dehydrates the sludge obtained as a result, and separates sludge and water content with reduced water content. The solid-liquid separation device shown here has an inlet member 1, an outlet member 2, and an intermediate support member 3 disposed therebetween.

The inlet member 1 has an end wall 4 on one side and an open tubular main body 7 on the other side, and an inlet pipe 11 integrally connected to an upper portion of the main body 7. The inlet 11 of the treatment target containing a large amount of water, that is, the sludge, is constituted by 11. A part of the flange 13 integrally provided on the open side of the main body 7 extends downward, and the lower end thereof is fixed to a stay 14 fixed to a pair of front and rear main body side plates (not shown) of the solid-liquid separator. As a result, the inlet member 1 is immovably supported by the main body side plate.

The outlet member 2 has a substantially rectangular cross-section in a horizontal cross section, and has an opening at an upper portion and a lower portion. The opening at the lower portion constitutes a discharge port 15 from which dehydrated sludge is discharged. One side wall 16 of the outlet member 2 extends downward, and a lower end portion thereof is fixed to the stay 17 fixed to the main body side plate, whereby the outlet member 2 is immovably supported by the main body side plate.

The intermediate support member 3 arranged between the inlet member 1 and the outlet member 2 is formed in a substantially cylindrical shape, and flanges 18 and 19 are integrally formed at respective axial ends thereof. Extends downward, and its lower end is fixed to a stay 20 fixed to the main body side plate, whereby the intermediate support member 3 is immovably supported with respect to the main body side plate.

A solid-liquid separator 5 is provided between the inlet member 1 and the intermediate support member 3 and between the intermediate support member 3 and the outlet member 2. The sludge containing a large amount of the inflowing water sequentially moves inside the two solid-liquid separation sections 5, where the sludge undergoes a dehydration treatment to separate the water, and the sludge having a reduced water content is discharged from the discharge port 15.

The solid-liquid separating section 5 has a plurality of fixing rings 6 as shown in FIG. 2, and these fixing rings 6 are concentrically arranged as shown in FIGS. 1, 3 and 4. A spacer 9 is sandwiched between the fixing rings 6, and a bolt 10 is inserted into a hole 8 formed in an ear 6 a of each fixing ring 6 and the spacer 9. In this example, four bolts 1
0 are used, and these are arranged on the same circumference.
Each bolt 10 passes through holes formed in the flange 13 of the inlet member 1, the two flanges 18 and 19 of the intermediate support member 3, and one side wall 16 of the outlet member 2, respectively. It is fixed by the combined nut 32.

As described above, the plurality of fixing rings 6 are arranged in the axial direction with a predetermined gap therebetween by the spacer 9, and are integrally fixed to each other by the bolt 10 and the nut 32. , Fixed to the intermediate support member 3 and the outlet member 2. A protrusion similar to the spacer 9 may be integrally provided on each fixing ring 6 to thereby form a gap between the fixing rings.

As shown in FIGS. 1 to 4, floating rings 30 are arranged in the gaps between the fixing rings 6. As shown in FIG. 4, the thickness T of each floating ring 30
Is set smaller than the gap width G between the fixing rings (T
<G) A predetermined minute gap g is formed between the end face of each fixed ring 6 and the end face of the floating ring 30 facing the end face. For example, when the gap width G is set to 6 mm and the thickness T of the floating ring 30 is set to 5 mm, each minute gap g between them is 0.5 mm. The outer diameter D ₁ of each floating ring 30 is smaller than the diameter D _{2 of} a circle C (FIG. 2) formed by the inner surfaces of the four spacers 9 located therearound, and the inner diameter of each fixed ring 6. It is set to be larger than D _3. With this configuration, each floating ring 30 can be moved in the radial direction without detaching from between the fixed rings 6, and can rotate around the central axis. As described above, the floating ring 30 is disposed so as to be freely movable in the gap between the fixed rings.

As described above, the plurality of fixing rings 6
And a plurality of floating rings 30, a tubular body 21 is formed. In the example shown in FIG. 1, the entire tubular body 21 is formed by two tubular body portions 21a and 21b sandwiching the intermediate support member 3 therebetween. Is configured. Inside the cylindrical body 21,
A space S is defined as shown in FIGS. 3 and 4, and a screw conveyor 31 extending in the axial direction of the tubular body 21 is disposed in the internal space S.

As shown in FIG. 1, the screw conveyor 31 includes a first conveyor 22 which is separately driven.
And one end of the shaft 24 of the first conveyor 22 passes through the end wall 4 of the inlet member 1 and is fixed to the first motor 26 fixedly supported by the end wall 4. Drive-coupled. The other end of the shaft portion 24 is rotatably supported by a bearing member 28 fixed to the intermediate support member 3. One end of the shaft portion 25 of the second conveyor 22 is rotatably supported by the bearing member 28, and the other end thereof passes through an opening 29 formed in one side wall 16 of the outlet member 2 and exits. Penetrating the other side wall 33 of the member 2,
It is drivingly connected to a second motor 27 fixedly supported on the side wall 33. The first and second conveyors 22, 23 are located on the same axis. As described above, the screw conveyor 31 is divided into the first and second conveyors 22 and 23, and the function and effect achieved by this will be described in detail later.

Next, while explaining the details of the operation of the solid-liquid separation device, other configurations will be clarified.

As shown by an arrow A in FIG. 1, a sludge containing a large amount of water after the water treatment is passed through a conduit (not shown) from the inlet 12 to the main body 7 of the inlet member 1 (not shown). Flows in. In this sludge, flocs have been formed by the coagulant mixed in advance with this sludge,
Many flocs are floating in the water.
The water content of the sludge before the treatment is, for example, about 99% by weight.

At this time, the screw conveyor 31 is driven to rotate around its central axis, whereby the sludge flowing into the main body 7 of the inlet member 1 flows out from the open end side of the main body 7, Flows into the internal space S of the cylindrical body 21 from the inlet opening 34 at one end in the axial direction of the cylindrical body 21 formed by the fixing ring 6 and the floating ring 30. Actually, the screw conveyor 31 is
The first and second conveyors 22 and 23 are driven to rotate by the first and second motors 26 and 27, respectively.
Are described as being driven to rotate.

The object to be treated containing a large amount of water, ie, sludge, flowing into the internal space of the cylindrical body 21, the internal space of the intermediate support member 3 is rotated by the rotation of the screw conveyor 31 around its central axis. As a result, the cylindrical body 21 moves toward the outlet opening 35 on the other end side in the axial direction. As described above, the first and second conveyors 2
The opposing ends of the shaft portions 24, 25 of the 2, 23
The bearing member 28 is rotatably supported by the bearing member 28 shown in FIG. 1. The flange portion 28a of the bearing member 28 extends from the circumferential surface of the intermediate support member 3 toward the center thereof as shown in FIG. It is screwed and fixed to the protruding protrusions 43, and has a size large enough to allow sludge to pass between the protrusions 43 and between the bearing member 28 and the inner peripheral surface of the intermediate support member 3. A gap is secured. Thus, the sludge can pass through the intermediate support member 3 without any trouble.

As described above, when the sludge moves inside the cylindrical body 21, the water separated from the sludge is discharged out of the cylindrical body through the minute gap g between each fixed ring 6 and the idle ring 30. Is done. As shown by arrows C ₁ and C ₂ in FIG. 1, the water flowing down from the cylindrical body 21 is received by the first and second trays 36 and 37 fixed to the above-mentioned main body side plate, respectively, and the respective drains thereof are discharged. It is discharged through outlets 38,39.

As described above, the water content of the sludge in the tubular body 21 is reduced, and the sludge having a reduced water content is discharged from the outlet opening 35 of the tubular body 21 and formed on the side wall 16 of the outlet member 2. Opening 29 and discharge hole 4 of regulating member 40 to be described later.
1 and is discharged into the outlet member 2 as shown by an arrow B in FIG. 1 and then dropped downward and collected while being guided by a shooter 42 fixed to the main body side plate. The water content of the sludge thus dewatered is, for example, about 80 to 85% by weight.

As described above, by continuously supplying sludge to the inlet 12 and rotating the screw conveyor 31, it is possible to separate solid-liquid sludge in a stable state.

By the way, when separating the water and the solid content in the sludge, it is inevitable that a part of the solid content enters the gap g between each of the fixing rings 6 and the floating ring 30, and this is left as it is. Then the gap g becomes clogged,
Water cannot flow down through the gap g.

However, since the floating rings 30 arranged between the fixed rings 6 can move around the axis and in the radial direction, the end faces of the floating rings 30 are
The solids which move with respect to the end face of the fixing ring 6 opposed thereto and have entered the minute gap g due to the scraping operation are efficiently discharged from the gap g. In this way, the minute gap g can be cleaned by the operation of the apparatus itself, clogging thereof can be prevented, and water can be reliably discharged through the gap g.

At this time, as shown in FIG. 4, the outer diameter D ₄ of the screw conveyor 31 is adjusted so that its rotation is not hindered.
Although the size is set slightly smaller than the inner diameter D ₃ of the fixing ring 6, the inner diameter D ₅ of the floating ring 30 is set smaller than the outer diameter D ₄ of the screw conveyor 31. Reference symbol P in FIG. 4 indicates a contact point between the inner peripheral surface of the floating ring 30 and the screw blade edge of the screw conveyor 31. With such a configuration, the rotation of the screw conveyor 31 causes each floating ring 30
Receives an external force from the screw conveyor 31 and positively moves relative to the fixing ring 6 in a direction substantially parallel to the fixing ring 6, thereby increasing the cleaning efficiency for the gap g. That is, since there is a difference (D ₄ −D ₅ ) between the outer diameter D ₄ of the screw conveyor 31 and the inner diameter D ₅ of the floating ring 30, when the screw conveyor rotates, the center axis of each floating ring 30 is adjusted to the screw conveyor. It moves positively relative to the central axis of 31. Since each floating ring 30 performs such a movement, the minute gap g between each floating ring 30 and each fixed ring 6 is obtained.
The solids that have entered can be very efficiently discharged out of the gap, and clogging can be effectively prevented. As described above, in the solid-liquid separation device of the present embodiment, each floating ring 30 is moved so that each floating ring 30 moves relative to the fixed ring 6 by the rotation of the screw conveyor 31.
An inner diameter D ₅ of it was set smaller than the outer diameter D ₄ of the screw conveyor 31.

As described above, the water content of the sludge dehydrated by the solid-liquid separation device described above is, for example, 80 to 85% by weight, and the water content is considerably low. In order to obtain such a sludge having a low water content, it is necessary to increase the dewatering efficiency of the sludge and efficiently separate the water from the sludge.

In order to satisfy this requirement, in the solid-liquid separation device of this embodiment, first, the pressure applied to the object to be treated in the cylindrical body, that is, the sludge, is controlled by applying the pressure applied to the inlet opening 34 of the cylindrical body 21.
, A pressure adjusting means for increasing the pressure gradually toward the outlet opening 35 is provided. In the illustrated example, as shown in FIG. 1, the pitch of the screw blades of the screw conveyor 31 is changed from the inlet opening 34 side of the cylindrical body 21 to the outlet opening 3.
5 and the outlet opening 3
The regulating member 40 provided on the side of 5 constitutes a pressure adjusting means.

As shown in FIG. 5, the regulating member 40 provided at the outlet opening 35 of the cylindrical body 21 has a disk-like shape having a boss 42 through which the shaft 25 of the screw conveyor 31 passes. Is formed. The outer diameter of the disk 45 is larger than the opening 29 formed in the side wall 16 of the outlet member 2, and the disk 45 closes the entire opening 29 from the outside of the cylindrical body 21, and It is located very close to or close to the second side wall 6. The disc 45 of the regulating member 40 is provided with a plurality of discharge holes 41 described above around the center thereof, and the boss portion 42 is formed on the screw conveyor 31, in this example, the shaft portion 25 of the second conveyor 23. Are fixed by screws 44. With this configuration, when the screw conveyor 31 rotates, the regulating member 40 also slides on the side wall 16 or the side wall 1.
6 while maintaining the state of being very close to 6.
Each discharge hole 41 penetrating the disk 45 of the regulating member 40 from the inside to the outside of the cylindrical body 21 is formed in the opening 2 of the side wall 16.
9.

As described above, the cylindrical body 21 is
The sludge that has flowed into the inside is carried to the outlet opening 35 side by the rotation of the screw conveyor 31, and undergoes a dehydration action during that time. At this time, since the regulating member 40 is configured as described above, The sludge dehydrated in the cylindrical body 21 passes through an outlet B
It is discharged outside as shown by. At this time, since the sludge passes through the discharge hole 41 of the regulating member 40, the amount of the sludge discharged from the tubular body 21 to the outside is restricted and regulated, whereby the pressure applied to the sludge in the tubular body 21 is reduced. , As it approaches the outlet opening 35. In addition, the pitch of the screw blades of the screw conveyor 31 gradually decreases from the inlet opening 34 side of the tubular body 21 toward the outlet opening 35, and the effective volume of the internal space of the tubular body 21 decreases. , The pressure applied to the sludge in the tubular body 21 also increases sequentially as the outlet opening 35 is approached, and the effect of squeezing the water on the sludge is enhanced. In this way, the sludge can be efficiently dewatered, and the water content of the dewatered sludge can be reduced as described above.

According to the above configuration, at the initial stage when the sludge flows into the cylindrical body 21, the pressure applied to the sludge is not so large, but the sludge at this time contains a large amount of water. As a result, water is efficiently separated from the sludge, and the water flows downward through the small gap g between the fixed ring 6 and the floating ring 30 by its own weight. This is similar to the phenomenon in which a large amount of water contained in a sludge having a high water content falls into a zigzag and flows downward through the zigzag eyes. If such a dehydration step is referred to as a sludge concentration step,
Such a concentration step is performed, for example, in a solid-liquid separation unit located about half of the entire cylindrical body 21, that is, on the upstream side of the intermediate support member 3 in the sludge moving direction. Referred to the inside region of the cylindrical body 21 to be performed with such a concentration step and concentration zone are denoted by the letter S ₁ designates in Figure 1 for the zone.

The sludge that has passed through the concentration zone S ₁ continues to move to the solid-liquid separation section downstream of the intermediate support member 3 in the sludge moving direction. In this case, as the sludge approaches the outlet opening 35, However, since the amount of water contained in the sludge is reduced, it is originally difficult to separate the water from the sludge. At this time, since a large pressure acts on the sludge, a large squeezing action is applied to the sludge. , Its dehydration efficiency is increased. Thus, the water content of the sludge when it exits the tubular body 21 can be reduced. The step of applying a large pressure to the sludge and increasing the squeezing action is referred to as a squeezing step. The squeezing step is a solid-liquid separation located at a position downstream of the intermediate support member 3 in the sludge moving direction. Done in the department. Such called drawing step cylinder 21 zones diaphragm an interior region of the carried out of, this zone are denoted by the letter S ₂ designates in FIG.

In FIG. 1, the concentration zone S ₁ and the throttle zone S ₂
Are clearly divided for convenience of explanation, but in practice, the process gradually and continuously shifts from the concentration process to the squeezing process, and these are not clearly separated.

By providing the pressure adjusting means as described above, it is possible to increase the dewatering efficiency with respect to sludge. However, as described above, simply providing the pressure adjusting means can reduce the dewatering efficiency with respect to sludge. There is a limit to the improvement, and it has been difficult to further improve the dewatering efficiency with the conventional solid-liquid separation device. The reason is as follows.

In the squeezing zone S ₂ , in order to enhance the squeezing effect of water on the sludge, a large amount of sludge is packed in the zone S _2, and the sludge with increased pressure is applied to the squeezing zone S ₂
Must be present in large quantities. Therefore, in the concentration zone S _1, rapidly against sludge, possible to separate a large amount of water, it is necessary to feed towards the zone S ₂ squeezed least since sludge water content actively. In order to obtain such an effect, the number of rotations of the screw conveyor 31 in the concentration zone S ₁ is increased, thereby speeding up the movement of the idle ring 30 to be operated, and the small gap g between the idle ring 30 and the fixed ring 6 is reduced. The solids that have entered must be quickly discharged and a large amount of water must be discharged through this gap g in as short a time as possible. If facilitate draining action in such concentrated zone S _1, performs efficiently the draining process by feeding a large amount of sludge in the concentration zone S ₁ per unit time, and large amount of squeezing water content of less since sludge it can be fed to the zone S _2. Thus, in the concentration zone S _1, it is necessary to increase the rotational speed of the screw conveyor 31.

On the other hand, in the stop zone S ₂ ,
Large amount of packed fed from the concentrated zone S ₁ sludge, so the sludge is present packed over a long range in the axial direction of the cylinder 21, to such sludges, while exerting great pressure, slowly And it is necessary to add a squeezing action to the sludge so that a large amount of water can be separated. To obtain such effects, lower the rotational speed of the screw conveyor 31 in the stop zone S _2, it must be reduced the operating speed of the floating ring 30. That is, in the draw zone S _2, it is not necessary to lower the rotational speed of the screw conveyor 31.

As described above, mutually contradictory requirements are imposed on the rotational speed of the screw conveyor 31 in the concentration zone S ₁ and the squeezing zone S ₂ . On the other hand, in the conventional solid-liquid separation device, one screw conveyor is inserted through the entire cylindrical body. That is, each part of the same screw conveyor is arranged for the concentration zone and the squeezing zone. Therefore, it is impossible to satisfy the requirements with respect to the rotational speed of the screw conveyor 31 in the concentration zone S ₁ and the stop zone S ₂ as described above, be sufficiently improved the overall dewatering efficiency has been difficult.

Therefore, in the solid-liquid separation device of this embodiment,
As described above, the screw conveyor 31 is divided into the first and second conveyors 22 and 23 located on the upstream side and the downstream side, respectively, with respect to the moving direction of the sludge (object to be treated) in the tubular body 21. The first conveyor 22 located on the upstream side with respect to the moving direction of the sludge (object to be treated) in the cylindrical body 21 is driven to rotate at a higher speed than the second conveyor located on the downstream side. Second conveyor first motor 26 is rotated at a high rotational speed of the first conveyor 22 is located in the concentration zone S _1, the second motor 27, is located in zone S ₂ stop at a lower rotational speed than the rotational speed 23 is driven to rotate. Thus, in the concentration zone S ₁ as described above, quickly separating the large amount of water from the sludge can be fed into the zone S ₂ squeeze a large amount of enhanced sludge of enrichment, the stop zone S _2, the A large amount of water can be separated slowly over a long period of time while applying a large pressure to the sludge, and the overall dewatering efficiency can be significantly increased. In the squeezing zone S ₂ , the sludge can be packed over a long range in the axial direction of the cylindrical body 21, so that the time required for the sludge sent to the squeezing zone S ₂ to be discharged from the cylindrical body 21. ,
In other words, the residence time can be lengthened,
A large amount of water can be squeezed out of the sludge. In this way, for example, sludge solids having a low water content of 80 to 85% can be discharged from the discharge holes 41 of the regulating member 40.

As can be understood from the above description, in the illustrated example, the first conveyor located on the upstream side in the moving direction of the processing object rotates at a higher speed than the second conveyor located on the downstream side. As described above, the driving means for rotating and driving the first and second conveyors respectively includes the first and second conveyors.
It is constituted by motors 26 and 27. It is desirable that the motors 26 and 27 be motors whose rotation speeds can be varied, and that the rotation speeds of the respective motors are appropriately adjusted in accordance with the properties of the object to be processed.

In the illustrated example, the screw blades of the screw conveyor 31 serve as pressure adjusting means for gradually increasing the pressure applied to the sludge in the cylindrical body 21 from the inlet opening 34 to the outlet opening 35 of the cylindrical body. Although the pressure adjusting means is constituted by the structure for changing the pitch and the regulating member 40, the pressure adjusting means may be constituted by another appropriate structure.
For example, instead of a configuration in which the screw blade pitch of the screw conveyor 31 is gradually reduced toward the outlet opening 35,
Alternatively, together with this configuration, the diameter of the shaft portion of the screw conveyor may be gradually increased toward the outlet opening 35, and the effective volume of the internal space of the tubular body 21 may be gradually reduced toward the outlet opening 35. As a result, the desired pressure can be applied to the sludge as described above. In addition, a regulating member having no discharge hole is used, which is disposed slightly apart from the outlet opening 35 of the tubular body 21, and the sludge is passed through a minute gap formed between the tubular body 21 and the regulating member. Can be discharged from the cylindrical body 21.

The solid-liquid separation device according to the present invention is not limited to the solid-liquid separation of sludge, but may be used for the production of surimi, the production of tofu, the papermaking process,
It can be widely used for sludge dredging and solid-liquid separation of construction sludge.

[0045]

According to the solid-liquid separation device of the first aspect, the pressure applied to the object to be treated in the cylindrical body is gradually increased from the inlet opening side to the outlet opening side of the cylindrical body. Since the first conveyor located on the upstream side with respect to the moving direction of the processing object is driven to rotate at a higher speed than the second conveyor located on the downstream side, the first conveyor at the initial stage when the processing object is introduced into the tubular body is driven. It performs water separation quickly and efficiently, and sends a large amount of processing objects toward the outlet opening of the cylindrical body.Here, slowly apply time while applying a large pressure to the large amount of processing objects. Water can be squeezed out, and the overall dewatering efficiency can be significantly increased as compared with the conventional case. In addition, the effect of preventing the solid from being clogged by the fixing ring and the floating ring is not hindered.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a solid-liquid separation device.

FIG. 2 is a perspective view showing one fixing ring, one floating ring, and a spacer.

FIG. 3 is an exploded perspective view of a solid-liquid separation unit.

FIG. 4 is a sectional view of a solid-liquid separation unit.

FIG. 5 is a sectional view taken along the line VV in FIG. 1;

FIG. 6 is a sectional view taken along the line VI-VI of FIG. 1;

[Explanation of symbols]

6 fixing ring 21 the tubular body 22 first conveyor 23 second conveyor 30 floating ring 31 a screw conveyor 34 inlet opening 35 outlet opening D ₄ outer diameter D ₅ inner diameter g microgap S inner space

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁶ , DB name) C02F 11/00-11/20 B01D 29/25 B30B 9/14

Claims (1)

(57) [Claims] A plurality of fixing rings arranged in the axial direction with a gap therebetween and fixed integrally with each other; a floating ring movably disposed in a gap between the fixing rings; A screw conveyor disposed in the internal space of the cylindrical body formed by the fixed ring and the plurality of floating rings, and extending in the axial direction of the cylindrical body, and rotating the screw conveyor around its central axis. By driving, the processing target containing a large amount of water flowing into the internal space of the cylindrical body from the inlet opening at one end side in the axial direction of the cylindrical body, the other end in the axial direction of the cylindrical body It is moved toward the outlet opening, and at this time, water in the object to be treated is discharged through the minute gap between each fixed ring and the floating ring to the outside of the cylindrical body, and the object to be treated having a reduced water content is removed from the cylindrical body. Out In the solid-liquid separation device, the inner diameter of each floating ring is set to be smaller than the outer diameter of the screw conveyor so that each floating ring performs relative movement with respect to the fixed ring by rotating the screw conveyor while discharging from the mouth opening. A pressure adjusting means for gradually increasing the pressure applied to the object to be processed in the cylindrical body from the inlet opening side to the outlet opening side of the cylindrical body; and providing the screw conveyor with the movement of the object to be processed in the cylindrical body. The first conveyor is divided into first and second conveyors respectively located on the upstream side and the downstream side with respect to the direction, and the first conveyor located on the upstream side with respect to the moving direction of the object to be processed is the second conveyor located on the downstream side with respect thereto A solid-liquid separation device comprising a driving means for rotating each of the first and second conveyors so as to rotate at a higher speed.