JPH03254804A - Rotary drum type filter apparatus - Google Patents

Abstract

PURPOSE:To certainly partition a liquid tank into a raw solution part and a filtrate part by filtering a raw solution containing particles in a suspended state toward the interior of a rotary drum and allowing the filtrate in the rotary drum to directly flow out of the liquid tank. CONSTITUTION:A screen 3b is provided to the peripheries of cylindrical body parts 3a opened at both ends thereof and the hollow shafts 3c connected to both end parts of the body parts 3a through a plurality of connection arms 3d are provided on both sides of the body parts 3a and a rotary drum 3 wherein one hollow shaft is connected to a variable speed drive means 13 is provided. The drum 3 is arranged so as to pierce through both side walls of a liquid tank 1 in the horizontal direction crossing the introducing direction of the raw solution above the settled particle lump 2 in the liquid tank 1 at a right angle so that both ends of the body parts 3a are allowed to face to the outside of the liquid tank 1. Further, a liquid flow preventing plate suppressing the flow of the raw solution is provided to the inner surface of the rear wall of the liquid tank in a protruding state on the raw solution non-introducing side thereof at a position lower than the center-of-rotation line of the drum 3 over the entire width in the liquid tank in contact with the outer peripheral surface of the drum 3 and fluid jet means 7, 8 are provided through the center holes of the shafts 3c inside the screen on the raw solution non-introducing side of the body parts 3a.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a rotating drum type filtration device for filtering raw water containing suspended particles to separate and recover the particles in the raw water.

[Conventional technology]

A large amount of treated water is used in a granulation treatment facility for metallurgical slag, and the treated water after use is usually continuously collected and recycled for reuse.

However, the treated water after these uses contains hard hair-like slag and fine slag particles in a suspended state, and if this is used for circulation as it is, it may cause abnormal wear of the circulation pump, blockage of pipes and valves, etc. Since this causes problems such as wear and tear on the injection nozzles, the treated water after use is recycled and reused after separating and collecting suspended particles through sedimentation, filtration, etc.

In recent years, filtration devices for separating and collecting suspended particles from raw water have been developed in recent years.While the raw water is filtered using a rotating drum with a screen surrounding the body, the particles in the raw water captured by the screen are A rotating drum type filtration device is often used to separate and collect the water by transferring it to the surface of the water.

Among these rotating drum type filtration devices, the rotating drum is immersed in raw water and the raw solution is directed into the rotating drum for filtration, while particles in the raw water are captured on the outer surface of the screen and transferred to the water surface for recovery. Examples of rotary drum type filtration devices of this type include those disclosed in Japanese Patent Application Laid-open No. 6384612 and Japanese Utility Model Application No. 01-56808.

The former rotating drum type filtration device (Japanese Patent Application Laid-Open No. 63-84612
As shown in Figure 4, the tank (No.
40) a rotating drum (41) disposed in a horizontal direction orthogonal to the introduction direction of raw water W; and a liquid tank (40).
A sealing member (43) arranged on the inner wall surface divides the raw water into a raw water inlet side (40a) and a filtrate outlet side (40b), and as shown by the arrow in the figure, the raw water W is transferred to the rotating drum (41). ) to filter the filtered water F into the rotating drum (41).
In the same figure, the rotating drum (41) is raised on the raw water inlet side (40a) while the filtrate is allowed to flow out of the liquid tank (40) from the outlet pipe (44) provided at the bottom of the filtrate outlet side (40b). The screen (42) is rotated in the direction of arrow A, and the particles P in the raw water W captured on the outer surface of the screen (42) are lifted above the water surface and transferred to the side opposite to the raw water introduction side, and the particles P are placed in the rotating drum (41). The bottom of the tank is blown into a chute (46) provided on the opposite side of the raw water introduction side of the liquid tank (40) by air jetted from the air jetting means (45).

On the other hand, the latter rotating drum type filtration device (Utility Model Publication No. 01568
No. 08) is a liquid tank (No. 5) into which raw water W is introduced, as shown in FIG. 5 a and FIG.
0), a rotating drum (51) is placed in a horizontal direction perpendicular to the introduction direction of raw water W, and drum support tubes (53) provided on both sides of the body are placed outside the liquid tank (50). arranged,
The raw water W is filtered into the rotating drum (51), and the filtered water F is passed through the end openings of the drum support tubes (53) on both sides of the rotating drum (51) as shown by the arrows in Figure 5. The rotating drum (51)
) is rotated in the direction shown by the arrow B in FIG.
A plurality of raking rakes (
54) and lift it above the water surface to the anti-raw water introduction side (50b)
The liquid is transferred by air jetted from the air jetting means (55) disposed within the rotating drum (51). ! ! !
The tank bottom is blown onto a conveyor (56) provided on the raw water introduction side (50b) of (50) and collected.

[Problem to be solved by the invention]

However, these conventional rotary drum type filtration devices each have the following problems.

That is, the former rotating drum type filtration device (JP-A-63-
No. 84612), even if the water level E on the raw water inlet side is raised, the water level on the filtrate outlet side can be kept low, and the particles P captured on the screen can be drained and blown away efficiently. There is a problem in that the sealing member that is supposed to provide a liquid seal between the raw water inlet side and the filtrate outlet side is rapidly worn, making it difficult to maintain a stable and reliable liquid seal between them.

This is the bottom of the tank where the rotating rotating drum and the sealing member at a fixed position come into contact and slide to form a liquid seal between the raw water inlet side and the filtrate outlet side of the tank. , Moreover, since there is a large water level difference between them, the sliding and
This is because raw water with hard particles enters the liquid seal and causes wear and tear on the sealing member and the screen around the outer periphery of the rotating drum.Especially, water pressure is high near the sealing member located at the bottom of the liquid tank. , the filtration action of the screen is intense in the vicinity, and the precipitation action is also added, and the largest number of particles P gathers therein, so that the particles P tend to get caught between the sealing member and the screen, significantly accelerating their wear. For this reason,
During filtration operation, the liquid sealing effect between the raw water inlet side and the filtrate outlet side is impaired, and the raw water W flows into the filtrate outlet side, resulting in filtrate F.
In order to maintain stable and reliable filtration operation over a long period of time, and to maintain the filtration function, frequent replacement and maintenance of screens and sealing members is required.

On the other hand, the latter rotating drum type filtration device (Utility Model Publication No. 01-56
In No. 808), the raw water W and the filtered water F are separated by a rotating drum, and the filtered water F in the rotating drum directly flows out of the liquid tank. Although there is no problem that the water F is contaminated, if the water level E on the raw water inlet side in the liquid tank is raised, the stagnant water level on the communicating side will also be higher, so particles P captured by the screen will be In order to blow off the raw water on the back side of the good introduction side where the screen is almost vertical and recover it reliably and efficiently, it is necessary to suppress the water surface E on the raw water introduction side to a level that does not exceed the height of the rotation axis S of the rotating drum. Sign.

On the other hand, the water surface E on the raw water introduction side is the rotation axis S of the rotating drum.
If the height of the screen is kept below the height of
Since it becomes difficult for the particles P to fall off during draining and move onto the water surface, a plurality of raking rakes are provided protruding from the outer peripheral surface of the screen to raise and hold the particles P, as shown in Fig. 5a.
In order to prevent the particles P from falling from the screen (52), it is necessary to take measures such as providing a negative pressure chamber (57) inside the screen (52), which makes the configuration complicated and increases the cost of the device. There is a problem with inviting people.

In addition, in this latter rotating drum type filtration device, as shown in FIG. However, since the rotating drum (51) is immersed in the raw water W and receives buoyancy, it is necessary to arrange a support roller above the support tube (53). In a structure in which both sides of the rotating drum are supported, it is practically difficult to assemble the drum so that it rotates with a constant center of rotation, and it is very unlikely that the drum will run out during rotation. , often
During filtration operation, raw water may leak out of the tank from the seal between the tank and the support tube, worsening the surrounding environment.
This leakage tends to cause problems such as hard particles in the raw water entering the seal and accelerating its wear.

Furthermore, the raw water used for the granulation treatment of metallurgical slag is usually at a relatively high temperature even during filtration, which inhibits the sliding and frictional heat dissipation of the sealing member that comes into contact with the raw water.
It promotes the layering.

In view of the above-mentioned problems of the prior art, the present invention filters a stock solution containing particles in a suspended state into a rotating drum, and allows the filtrate in the rotating drum to directly flow out of the liquid tank.
Even if the partition between the stock solution and the filtrate is ensured, and the liquid level on the stock solution introduction side is higher than the rotation center line of the rotating drum, the liquid level on the side opposite to the stock solution introduction side of the rotating drum can be kept low. hand,
The particles captured by the screen can be drained and blown away efficiently, and the liquid seal between the rotating drum and the liquid tank can be maintained reliably and for a long time, allowing stable and long-term filtration operation with high efficiency and precision. The purpose of the present invention is to provide a rotating drum type filtration device that can continue to perform the following steps.

[Means to solve the problem]

In order to achieve the above object, the present invention has the following configuration. That is, the rotating drum type filtration device according to the present invention includes a liquid tank that is connected to a feeding path for the stock solution and has a settled particle reservoir at the bottom that is connected to a discharge means, and a cylindrical body that is open at both ends. A screen is provided around the body, hollow shafts are provided on both sides connected to each end of the body via a plurality of connecting arms, the hollow shafts on both sides are supported by bearings, and one of the hollow shafts is controlled at a variable speed. a rotating drum connected to a driving means, the rotary drum being inserted through both side walls of the liquid tank in a horizontal direction perpendicular to the introduction direction of the raw solution above the settled particle pool of the liquid tank. The part is arranged with both ends facing the outside of the liquid tank, and the tip edge is in contact with the outer circumferential surface of the rotating drum on the inner surface of the rear wall of the liquid tank on the side opposite to the raw solution introduction side at a position lower than the rotation center line of the rotating drum. A liquid flow blocking plate for suppressing the flow of the stock solution is provided in a protruding manner over the entire width of the tank, and fluid is injected through the center hole of the hollow shaft of the rotating drum to the inside of the screen on the side opposite to the stock solution introduction side of the body of the rotating drum. and an end face sliding seal member having an inverted N-shaped cross section opening in the outer radial direction is disposed on the outer periphery of both ends of the rotary drum body, while the liquid A cylindrical seal receiving portion is provided on each side wall of the tank, protruding concentrically toward the outer periphery of the end of the rotating drum body, and having a groove surrounding the inner diameter surface thereof communicating with the coolant circulation means; End face sliding type seal members on the outer periphery of both ends of the rotary drum body are fitted into the grooves of these cylindrical seal receiving portions so as to be slidable and rotatable.

[Effect]

In the rotating drum type filtration device of the present invention equipped with the tank bottom described above, the stock solution containing suspended particles introduced into the tank is filtered inward through a screen in the body of the rotating drum. The particles inside are captured on the outer surface of the screen, and the filtrate that has passed through the screen is collected by directly flowing out of the liquid tank from the openings at both ends of the rotating drum body, while the rotating drum is rotated in an upward direction on the raw liquid introduction side. The particles captured on the outer surface of the screen are lifted onto the liquid surface and transferred to the side opposite to the raw solution introduction side, and are blown away from the screen by a jet from the fluid jetting means installed inside the screen on the opposite side to the raw solution introduction side. can be recovered.

On the other hand, the stock solution introduced into the liquid tank is prevented from rising on the side opposite to the stock solution introduction side of the rotating drum by a liquid flow blocking plate protruding from the rear wall of the tank on the side opposite to the stock solution introduction side, resulting in low resistance. It flows through the screen and into the rotating drum body while being filtered.
Formation of a retained liquid level higher than the rotational center line of the rotating drum on the side opposite to the introduction of the stock solution is prevented. Therefore, even if the liquid level on the raw solution introduction side is set higher than the center line of rotation of the rotating drum, the height position of the fluid injection means, that is, the position at which the captured particles are blown away, can be adjusted so that the outer circumferential surface of the screen is approximately perpendicular. The screen can be set at a height such that the captured particles can be reliably and efficiently removed from the screen. In addition, the liquid level height on the undiluted solution introduction side can be adjusted by changing the rotation speed of the rotary drum using a variable speed drive means in response to fluctuations in the amount of undiluted solution fed and the particle content in the undiluted solution. Resist! lJ can be adjusted to maintain the height within a predetermined range.

In addition, since the body of the rotating drum is connected to the hollow shaft via the support arm, the liquid can freely flow through the openings at both ends of the body, and the filtrate can flow out without stagnation. Since the hollow shafts on both sides are supported by bearings, the center of rotation can be easily determined, and the rotation during filtration operation can be made smooth with less vibration. On the other hand, since the fluid ejecting means is disposed through the center hole of the hollow rotating shaft of the rotating drum, it is not affected by the rotation of the rotating drum.

Furthermore, the liquid seal between both ends of the rotating drum body and both side walls of the liquid tank is achieved by an end face sliding seal member ringed on the outer periphery of the end of the rotating drum body, and a side wall of the liquid tank. Since it fits into the groove provided around the inner diameter surface of the cylindrical seal receiving part provided in the
In other words, since the filtration is carried out through contact and sliding between both sides of the outer periphery of the end sliding type seal member and both inner sides of the groove of the cylindrical seal receiver, the influence of load fluctuations, temperature of the stock solution, etc. during filtration operation is eliminated. So, even if there is some fluctuation in the rotation of the rotating drum,
It does not impair its liquid sealing function.

In addition, the coolant circulation means communicating with the groove of the cylindrical seal receiver allows a pressure slightly higher than the liquid pressure in the liquid tank to be generated in the annular space formed between the groove and the end face sliding type seal member. By circulating the coolant, 1, sliding 11! In addition to preventing the end face sliding type seal member from rising in temperature due to frictional heat or the temperature of the raw water and maintaining its liquid sealing function for a long time, the raw liquid is kept between the cylindrical seal receiver and the end face sliding type seal member. Intrusion can be completely prevented, and leakage of the undiluted solution to the outside of the liquid tank can be reliably prevented for a long period of time.

On the other hand, if the filtration operation continues, the particles in the stock solution will settle and will not be deposited on the bottom of the tank, but the stock solution at the bottom of the tank where the settled particles are concentrated is transferred to the settled particle reservoir provided at the bottom of the tank. The particles in the stock solution settle at the bottom of the tank, become concentrated and deposited, and are collected outside the liquid tank or circulated again to the raw solution introduction side of the liquid tank by a discharge means communicating with the settled particle reservoir. It is possible to completely prevent the rotation of the rotary drum and damage to the screen, and the filtration operation can be continued stably for a long period of time.

〔Example] Embodiments of the present invention will be described below with reference to the drawings.

1FyJ is a front sectional view of a rotary drum type filtration device according to an embodiment of the present invention, and FIG. 2 is a sectional view taken along the line 1--2 of FIG. In FIGS. 1 and 2, (1) is a liquid tank, and the inlet side of the liquid tank (1) shown by arrow A in FIG. A sedimentary particle reservoir (2) is provided at the bottom with a steep inclination in the shape of an inverted trapezoid and protrudes downward. Further, at the inner bottom of the sedimentary particle reservoir (2), there is a screw a' for discharging sludge. J is provided.

(3) is a rotating drum, and the rotating drum (3) is
A cylindrical body (3a) with both ends open;
〉A screen (3b) made of a stainless steel mesh panel removably installed around the outer periphery is connected to each end of the body (3a) via a plurality of connecting arms (3d) arranged radially. The part (3a) is provided with a hollow shaft (3c) protruding from both sides, and extends in a horizontal direction perpendicular to the introduction direction of the raw water W directly above the settled particle reservoir (2) of the liquid tank (1). Both ends of the body (3a) are connected to both side walls (l) of the liquid tank (1).
a) (lb) and is disposed so as to face the filtration waterway FL provided on both outsides of the liquid tank (1). Also,
The rotating drum (3) has hollow shafts (3c) on both sides supported by self-aligning bearings (4) disposed on both sides of the liquid tank (1), and one hollow shaft (3c) It is driven and rotated by an electric motor 03) with a transmission connected to the motor 03) so that the rotational speed can be changed.

(5) is an upper liquid flow blocking plate, (6) is a lower liquid flow blocking plate, and these upper and lower liquid flow blocking plates (5) (61 are liquid tank (1)
On the inner surface of the rear wall (1c) of the anti-raw water introduction system, move the shelf up and down at a position lower than the rotation center line S of the rotating drum (3), and attach the tip edge of each shelf to the body (3a) of the rotating drum (3). )
It is curved in the horizontal direction over the entire width of the liquid tank (1) in contact with the outer periphery. In addition, these upper and lower liquid flow blocking plates (5
Seal plates (5a) and (6a) made of heat-resistant and wear-resistant rubber are attached to the tip edges of ) and (6).

(7) is an air injection nozzle, and this air injection nozzle (7) is a tube body provided with a large number of injection holes, and a rotating drum (
A screen (
3b) arranged horizontally along the inner surface;

(8) is a fountain nozzle, and this fountain nozzle (8) is a pipe body provided with a large number of injection holes, and the air injection nozzle (8) is a pipe body provided with a large number of injection holes. Nozzle (7)
The lower screen (3b) is arranged horizontally along the inner surface of the screen (3b).

The air injection nozzle (7) is arranged at a position approximately at the same height or slightly higher than the rotation center line S of the rotating drum (3), with its injection hole directed toward the outer circumferential direction of the rotating drum (3), The inlet side communication pipe (7a) is connected to an external holder and compressed air supply device (not shown here) through the center hole of one hollow shaft (3c) of the rotating drum (3). , the fountain nozzle (8) is an air injection nozzle (
7) is arranged below with its injection hole facing between the upper and lower liquid flow blocking plates (5) and (6) at the rear of the rotating drum (3),
The inlet communication pipe (8a) is connected to an external holder and pressurized water supply device (not shown here) through the center hole of the other hollow shaft (3c) of the rotating drum (3). . In addition, these air injection nozzles (7) and fountain nozzles (8) are connected to a connecting rod 07) arranged between them.
They are connected and held together within the rotary tram (3) via.

(9) is a particle shooter, the particle shooter (9)
is provided on the rear wall (lc) of the liquid tank (1) on the opposite raw water inlet side, and its upper inlet side is aligned with the rotation center line S of the rotating drum (3).
The opening is at approximately the same height as the liquid tank (), and the outlet opening below it is opened at approximately the same height as the liquid tank.
) It is placed on top of the particle collection container located on the rear side. In addition, the upper rear wall of the particle unit (9) is provided relatively high, and on its inner surface there is an anti-I!
Absorbent rubber plates (9a) are replaceably attached at intervals.

On the other hand, the outer circumferential surface of each of both ends of the body (3a) of the rotating drum (3) has a cross-sectional shape extending in the outer radial direction, as shown in FIG. opening inverted n
A seal ring 00) with a sliding end face shaped like a letter is mounted on the ring. This seal ring 0ω is made of highly abrasion-resistant nitrile butadiene rubber, and is firmly secured by metal drive bunts (151) on the outer peripheral surface of each end of the body (3a) of the rotating drum (3). Being fastened and restrained.

On the other hand, on the outer surface of each of the through parts at the ends of the body (3a) of the rotating drum (3) on both side walls (la) (lb) of the liquid tank (1), the body (3a) of the rotating drum (3) is ) A cylindrical seal receiver 00 is provided that protrudes concentrically toward the outer periphery of the end portion.

These cylindrical seal receivers OD have square grooves (Il) on their inner diameter surfaces.
a) is made of stainless steel and can be divided into two in the vertical direction, and can be attached to and detached from the liquid tank (1). In addition, the square grooves (
On both side walls of lla), there are ring-shaped sliding plates O with low frictional resistance.
Q is removably attached.

In the rectangular grooves (lla) of these cylindrical seal receivers aO, seal rings αω, which are ringed around the outer circumferential surface of both ends of the body (3a) of the rotating drum (3), are attached to the sliding surfaces on both sides of the outer circumference. Ring-shaped sliding plate on both sides of the square groove (Ila) 06) WJ
It is fitted in such a way that it can slide and rotate while abutting against it.

In addition, the upper and lower parts of the cylindrical seal receiver OD are provided with water ports (Ilb) (Ilc) that communicate the inside of the rectangular groove (lla) with an external cooling water supply means (not shown). The rectangular groove (l) of the cylindrical seal receiver OD is
Pressure water for cooling is circulated within the annular space formed between the seal ring 0ω and the outer periphery of the seal ring 0ω.

In this embodiment, the upper water inlet (llb) of the cylindrical seal receiver 01) is the outlet side, while the lower water inlet (llb) is the outlet side.
llc) with a large wound, and a pressure regulating valve is installed in the pipe connected to the outlet side, and the pressure water for cooling is circulated from the bottom to the top, and the water pressure can be adjusted arbitrarily with the pressure regulating valve. And so.

On the other hand, the screw 0 installed at the inner bottom of the settled particle reservoir (2)
The force forms a left-right reverse screw with the central part as the boundary, and draws the sedimented particles thickened into sludge to the central side of the sedimentary particle reservoir (2) to the discharge port (2a) provided at the lower center of the sedimentary particle reservoir (2). The system is designed to reduce the load on the liquid seals at both ends.

In the rotating drum type filtration device of this embodiment having the above configuration, first, raw water W containing particles P such as hair-like slag in a suspended state is introduced into the liquid M(1) via the water supply channel. At the same time, the rotating drum (1) is rotated in the direction of rising on the introduction side of raw water W and descending on the good introduction side (in the direction shown by arrow B in Fig. 1), while compressed air is injected into the air injection nozzle (7). is supplied and ejected from the injection hole to start the filtration operation.

The raw water W introduced into the liquid tank (1) is transferred to the rotating drum (3).
The filtered water F that has passed through the screen (3b) of the body (3a) flows out from the openings at both ends of the body (3a) without stagnation,
The liquid is collected through filtration channels PL provided on both sides of the liquid tank. On the other hand, the particles P in the raw water W captured on the outer surface of the screen (3b) by this filtration are lifted above the water surface by the rotation of the rotating drum (3) and descended on the side opposite to the raw water introduction side of the screen (3b). The airflow from the air injection nozzle (7), which is moved to the rear side and is disposed in the body (3a) of the rotating drum (3) on the side opposite to the raw water inlet, blows the particle shooter from the screen (3b). (9) Particle collection conveyor (b) that is blown inward and placed below it.
be collected through.

At this time, the height of the water surface E on the raw water introduction side in the liquid tank (1) is such that the contact area between the screen (3b) and the raw water W is increased to increase the filtration efficiency, and the draining position of the screen (3b) is is set higher than the rotation center line S of the rotating drum (3) in order to make the screen (3b) surface oblique and at a high position where particles P captured on its outer surface can be prevented from falling off.

Here, in this embodiment, the screen (3b
) to maintain the height of the water surface E on the raw water introduction side within a predetermined range.

By the way, the raw water W introduced into the liquid tank (1) tries to form a water surface on the opposite raw water introduction side of the rotating drum (3) at the same height as the water surface E on the raw water introduction side. (1)
A protrusion is provided on the inner surface of the rear wall (1c) on the side opposite to the raw water introduction side at a position lower than the rotation center line S of the rotating drum (3). > The upper and lower liquid flow blocking plates (5) (6) in contact with the outer periphery prevent the liquid from rising on the side opposite to the raw water introduction side of the rotating drum (3), and the liquid flows through the screen (3b) with low resistance to the body. (3a) flows inward while being filtered, and is prevented from forming a water level higher than the rotation center line S of the rotating drum (3) on the side opposite to the raw water introduction side.
), the filtered water F in the body (3a) directly flows out of the liquid tank (1) from the openings at both ends and does not stay in the body (3a), and the screen located below the opposite raw water inlet side (3b)
This is due to the combined effects of the fact that the filtration ability is restored immediately after receiving the airflow ejected from the inside, and that the rise is prevented by the two-stage structure of the upper and lower liquid flow blocking plates (5) and (6). considered certain.

Here, in this embodiment, from the fountain nozzle (8) provided below the air injection nozzle (7) in the body (3a) of the rotating drum (3) to the upper and lower liquid flow blocking plates (5) (6) By jetting pressurized water toward the inner surface of the screen (3b) located between the screen (3b), the filtration ability of the screen (3b) is reliably restored, and the raw water W that has risen beyond the lower liquid flow blocking plate (6) is
By promoting the filtration inflow into the body part (3a) of the rotary drum (3), the rising of the raw water W on the side opposite to the raw water introduction side of the rotating drum (3) is further ensured.

In addition, seal plates (5a) (6a) made of heat-resistant and wear-resistant rubber are attached to the tip edges of the upper and lower liquid flow blocking plates (5) (6).
are attached to ensure the liquid flow blocking effect and to reduce wear of the screen (3b) that comes into contact with and slides on these.

In this way, in the rotating drum type filtration device of this embodiment that suppresses the rise of the raw water W on the side opposite to the raw water introduction side of the rotating drum (3), the water surface E on the raw water introduction side is controlled by the rotating drum (3).
The screen (3b) is higher than the rotation center line S of 3).
The screen (3b)
The draining position of the screen (3b) can be set at a high position where the trapped particles P can be prevented from falling off.
), and the captured particles P
can be easily and reliably removed from the screen (3b), thereby increasing the filtration efficiency.

On the other hand, in the rotating drum type filtration device of this embodiment, since the rotating drum (3) has both ends of its body (3a) connected to the hollow shafts (3c) on both sides via the connecting arms (3d), The filtered water F can flow out from the openings at both ends of the body (3a) without being retained, and the hollow shafts (
3C) is supported by the self-aligning bearing (4), the center of rotation can be easily and reliably determined and assembled, and rotation during filtration operation can be made smooth with less runout.

In addition, the liquid seal between both ends of the body (3a) of the rotating drum (3) and both side walls (la) (lb) of the liquid tank (1) is connected to the cylindrical seal receiver OD of the liquid tank (1). Contact/sliding between the stomach inner surface of the square groove (lla) and both outer peripheral side surfaces of the end-sliding type seal ring 00) of the rotating drum (3) fitted into the square groove (lla). During the filtration operation,
Even if there is some fluctuation in the rotation of the rotating drum (3) due to load fluctuations or the temperature of the raw water W, the liquid sealing effect will not be impaired, and this rectangular groove (lla) and seal By setting the pressure of cooling water to be circulated between the outer periphery of ring 00) to be slightly higher than the water pressure in the liquid tank (1), seal ring 0 [D
In addition to preventing the temperature from rising, it can also completely prevent the raw water W from entering between the cylindrical seal receiver OD and the seal ring O[D. At the same time, leakage of the raw water W to the outside of the liquid tank (1) can be reliably prevented for a long period of time.

On the other hand, if the filtration operation is continued, some of the particles P in the raw water W will settle and be deposited on the bottom of the liquid tank (1). The sludge-like raw water W in which the settled particles are concentrated is guided to the settled particle reservoir (2) provided at the bottom using a screw provided at the inner bottom.
Since the particles P in the raw water W are collected outside the liquid tank (1) and forced to circulate again to the raw water introduction side of the liquid tank (1), the particles P in the raw water W are collected outside the liquid tank (1).
) The filtration operation can be continued stably for a long period of time without settling or accumulating at the bottom and inhibiting the rotation of the rotating drum (3) or damaging the screen (3b).

In this example, a screw 0 is disposed at the inner bottom of the settled particle reservoir (2), and the settled particles P are thereby collected from the discharge port (2b) to the outside of the liquid tank (1). However, this is just an example, and other discharge means such as a sludge pump provided outside of the liquid N (1) is connected to the settled particle reservoir (2).
) may be configured to communicate with the outlet (2b) of the outlet (2b).

〔Effect of the invention〕

As described above, the rotating drum type filtration device according to the present invention filters the stock solution containing suspended particles into the rotating drum, and directly drains the filtrate in the rotating drum to the outside of the liquid tank. By letting the liquid flow out, the separation between the stock solution and the filtrate in the liquid tank can be ensured, and even if the liquid level on the stock solution introduction side is higher than the rotation center line of the rotating drum, it is possible to ensure the partition between the stock solution and the filtrate in the liquid tank. The liquid level on the inlet side can be kept low, allowing the particles captured by the screen to drain and be blown away efficiently, and the liquid seal between the rotating drum and the liquid tank can be reliably maintained for a long period of time. It is possible to continue stable and long-term filtration operation with high efficiency and precision.

[Brief explanation of drawings]

Figure tJJ1 is a front cross-sectional view showing a rotating drum type filtration device according to an embodiment of the invention, Figure 2 is a cross-sectional view taken along the line ■-■ in Figure 1, Figure 3 is an enlarged cross-sectional view of the A section in Figure 1, and Figure 4. 5 is a front sectional view showing an overview of a conventional rotating drum type filtration device, FIG. 5 a is a front sectional view showing an overview of another conventional rotating drum filtration device, and FIG. (1)-liquid tank, (3) one-rotation drum, (3bL-screen, (3d)-connection arm, (5)-upper liquid flow blocking plate, (7)-air injection nozzle, (9)-particles Shooter, 01) - cylindrical seal receiver, Q21 - screw, E - raw solution introduction side water surface, P - particles, W - raw water, A cross-sectional view. 00 ) - Seal ring, (lla) - Unilateral groove, 0 and 1 electric motor with gearbox, F - Filtered water, S - Center of rotation, WL - One waterway. agent

Claims (1)

[Claims] A liquid tank having a settled particle reservoir connected to a supply path of the raw solution and communicating with a discharge means at the bottom, and a cylindrical body with both ends open and a screen surrounding the body, and a screen provided at both ends of the body. Each drum is provided with hollow shafts on both sides that are connected to each other through a plurality of connecting arms, the hollow shafts on both sides are supported by bearings, and one of the hollow shafts is connected to a variable speed drive means. , the rotating drum is disposed in a horizontal direction perpendicular to the introduction direction of the raw solution above the settled particle pool of the liquid tank, passing through both side walls of the liquid tank so that both ends of the body face the outside of the liquid tank. At the same time, a liquid flow blocking plate is installed on the inner surface of the rear wall of the liquid tank at a position lower than the center line of rotation of the rotating drum on the side opposite to the introduction of the liquid solution, the leading edge of which comes into contact with the outer peripheral surface of the rotating drum to suppress the flow of the liquid liquid. A fluid ejecting means is disposed in a protruding manner over the entire width of the liquid tank, and is disposed inside the screen on the opposite side of the raw solution introduction side of the rotary drum body through a center hole of the hollow shaft of the rotary drum, and On the outer periphery of both ends of the liquid tank, an end face sliding seal member having an inverted Π-shaped cross section opening in the outer radial direction is installed. A cylindrical seal receiving part is provided concentrically protruding toward the outer periphery of the drum, and has a circumferential groove on its inner diameter surface that communicates with the coolant circulation means. 1. A rotating drum type filtration device, characterized in that end face sliding type seal members on the outer periphery of both ends of the part are slidably and rotatably fitted.