JPH0626326Y2 - Rotating drum filter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a rotary drum type filtration device for filtering raw water accompanied by suspended particles to separate and collect suspended particles in the raw water.

[Conventional technology]

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

However, in these treated water after use, hard hairy slag and fine slag particles are contained as suspended particles,
If this is circulated and reused as it is, it causes problems such as abnormal wear of the circulation pump, blockage of pipes and valves, and wear of the injection nozzle.Therefore, the treated water after use separates suspended particles by sedimentation or filtration. -Recycled and reused after collection.

As a filtering device for separating and collecting floating particles from raw water accompanied by such floating particles, in recent years, while filtering the raw water with a rotating drum having a screen on the body, the floating particles in the raw water captured by the screen are collected. A rotating drum type filtration device is often used in which the rotating drum moves to the surface of the water to collect it.

Among these rotary drum type filtration devices, as a rotary drum type filtration device which introduces raw water into the inside from both end openings of the rotary drum and filters the raw water from the inside of the rotary drum to the outside, the Japanese Patent Application No. 62- There is one proposed in 96090.

In this conventional rotary drum type filtration device, as shown in FIG. 5 which is a conceptual explanatory view, a screen (53) is provided around the body (52), and drum support cylinders (54) are provided at both ends thereof. A rotary drum (51) provided with (55) and having both ends opened in a cylindrical shape is supported by drive rollers (56) provided below both ends of the rotary drum (51) and rotatably arranged in the horizontal direction. The water supply channels (57) and (58) are arranged so as to face the openings of both ends of the rotary drum (51).

Then, the raw water W with suspended particles sent through these water supply channels (57) (58) is introduced into the inside from both end openings of the rotating drum (51) as shown by the arrow in the figure Filtered from the bottom to the outside, and the filtered water is filtered from the body (52) of the rotating drum (51).
While collecting via the recovery water channel (59) arranged below,
Suspended particles in the raw water W captured by the screen (53) of the body (52) are transferred onto the water surface by the rotation of the rotating drum (51),
Here, the rotating drum (5
It is supposed to be collected outside the side of 1).

Further, in the water supply channel (57) (58), a water supply weir (60) (61) opened in a semi-circular shape concentric with the inner diameter of the drum support cylinder (54) (55), the rotary drum (51) The drum support cylinders (54) (55) at both ends are provided so as to face the respective openings, and the water supply weirs (60) (61) are projected into the openings of the drum support cylinders (54) (55) from the openings, One of its ends is watertightly connected to the water supply weir (60) (61) opening,
The other end is brought into contact with the inner peripheral surface of the drum support cylinder (54) (55),
In addition, both ends in the circumferential direction are arranged in an arc shape to a position higher than the regulated water surface of the water supply channels (57) (58), and seal bodies (62) (63) made of elastic members such as rubber are provided, and these Seal body (62) (6
By 3), the raw water W is sealed between the water supply weirs (60) (61) provided at fixed positions and the drum support cylinders (54) (55) at both ends of the rotating rotating drum (51). It is configured to do.

[Problems to be solved by the device]

In the conventional rotary drum type filtration device described above, the raw water W can be introduced symmetrically from both sides of the rotary drum (51) to the inside so that the introduction speed of the raw water W can be lowered, and the particles in the raw water W and the screen ( It is possible to reduce the wear of the screen (53) due to the collision with 53), prevent the deterioration of the filtered water quality due to the disturbance of the raw water W, and easily adjust the regulated water surface height to change the filtration area. It has excellent features such as possible,
However, on the other hand, the seal of the raw water W between the openings of both ends of the rotating rotary drum (51) and the water supply weirs (60) (61) of the water supply channels (57) (58) at the fixed position must be ensured. The raw water W leaks downward during filtration and the rotating drum (51)
It is easy to cause a trouble that the filtered water flows into the recovery water channel (59) and contaminates the filtered water.
The wear of (62) (63) progresses significantly, and frequent sealing bodies (62) (6
There is a problem that replacement / maintenance of 3) is forced.

This is the drum support cylinder (54) (55) at both ends of the rotating drum (51).
And the water supply weirs (60) (61) are to be sealed, the seal bodies (62) (63) are cantilevered at the openings of the water supply weirs (60) (61) and the drum support cylinder (54). It is in the shape of a semi-circle that is abutted against the inner peripheral surface of (55) and is hard to be pressed uniformly in the outer peripheral direction.
It is difficult to bring these seal bodies (62) and (63) into contact with the inner peripheral surface of the drum support cylinders (54) and (55) with sufficient and uniform pressing force to obtain the sealing effect. drum
However, since the (51) does not have a central axis due to the restriction of opening both ends, the water supply weir (60) (6) (6)
It is difficult to place the semi-circular opening in (1) so that it is perfectly aligned with the center of the opening, and it is easy to cause center runout relative to the fixed side during rotation, which makes the sealing effect unstable. Is.

In addition, the raw water W normally used for water granulation of metallurgical slag
The temperature is relatively high even at the time of filtration, which hinders the dissipation of sliding / friction heat of the seal bodies (62) (63) in contact with the raw water W and promotes the abrasion of the raw water W. This is because the hard slag particles inside penetrate into the sliding surfaces of the seal bodies (62) and (63), further accelerating the abrasion and shortening the service life.

In view of the above problems, the present invention can reliably seal between the open end of the rotating rotary drum and the water supply weir of the water supply passage arranged at a fixed position, and maintain the sealing effect for a long period of time. It is an object of the present invention to provide a rotary drum type filtration device having a possible structure.

[Means for Solving the Problems]

In order to achieve the above object, the rotary drum type filtration device of the present invention is rotatably arranged in a horizontal direction, a screen is provided around the body, and at least one end of the screen is opened cylindrically. A rotary drum, a water supply weir that is disposed so as to face the cylindrical opening end of the rotary drum, and has a water passage opening toward the inside of the cylindrical opening, and is connected to the water passage of the water weir. In the rotary drum type filtration device including the water supply passage, an end face sliding type seal member having a reverse Π shape whose cross-sectional shape opens in the outer diameter direction is provided on the outer peripheral surface of the cylindrical opening end portion of the rotary drum. On the other hand, a cylindrical seal receiving member is provided on the surface of the water supply weir facing the rotating drum, which is concentrically protruding toward the outer periphery of the cylindrical end of the rotating drum and has a square groove on the inner diameter surface. While protruding the part, rotate in the square groove of the cylindrical seal receiving part of this water supply weir An end surface sliding type seal member on the outer periphery of the ram end portion is slidably fitted to the ram end portion, and at least the rectangular groove bottom provided around the inner diameter surface of the cylindrical seal receiving portion of the water supply weir communicates with the outside. Two liquid passages are provided, and the liquid supply / drainage means for circulating the cooling liquid is connected to these liquid passages.

In addition to the above-mentioned configuration, an annular sloped surface portion that reduces in diameter toward the opening end is formed on the inner peripheral surface of the cylindrical opening end portion of the rotating drum, while the surface of the water supply weir facing the rotating drum is rotated. The drum is formed into an arc along the lower inner peripheral surface of the cylindrical opening end, projects toward the inside of the cylindrical opening, and contracts toward the tip toward the outer peripheral surface facing the annular sloped surface of the inner peripheral surface of the cylindrical opening end. A circular arc member formed by forming a circular arc-shaped slope surface portion is provided in a protruding manner, and the cross-sectional shape narrows toward the water supply weir side between the circular slope surface portion of the inner circumference of these cylindrical end portions and the arc-shaped slope surface portion of the circular arc member. A wedge-shaped arc-shaped seal member is provided, and this arc-shaped seal member is connected to and held by an ammunition machine provided at a fixed portion on the water supply weir side to move the rotary drum in the rotation direction. It was supposed to be restrained and urged toward the water supply weir side There.

〔Example〕

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

FIG. 1 is a front sectional view showing a main part 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 AA of FIG.

In FIG. 1 and FIG. 2, (1) is a rotary drum, and this rotary drum (1) has a screen panel (1b) made of stainless steel mesh around the outer periphery of the body (1a). The support cylinders (1c) and (1d) having a diameter smaller than the diameter of the body portion (1a) are provided at both ends thereof. The rotary drum (1) is rotatably supported in the horizontal direction by a pair of drive rollers (2) and (3) provided below the supporting cylinders (1c) and (1d) at both ends thereof. .

Further, these drive rollers (2) and (3) are connected to a drive means (not shown here), and rotate the rotary drum (1) in the direction of arrow A in FIG.

(4) and (5) are water supply weirs, and these water supply weirs (4) and (5) are close to each other so as to cover the open ends of the supporting cylinders (1c) and (1d) at both ends of the rotating drum (1). And are arranged vertically. Further, these water supply weirs (4) and (5) are provided with water passage openings (4a) and (5a) which are opened so as to face the lower opening ends of the support cylinders (1c) and (1d).

(6) and (7) are water channels, and these water channels (6) and (7) are upper open type water channels with a regulated water surface, and the end of the channel is a rotating drum.
(1) They are located at the sides of both ends, and are arranged so as to communicate with the water inlets (4a) and (5a) of the water supply weirs (4) and (5), respectively. Further, the upper edges of these water supply channels (6) and (7) are set to have substantially the same height as the rotation center of the rotary drum (1).

Reference numeral (8) is a filtered water channel, and the filtered water channel (8) is arranged such that the upper opening of the inlet side end thereof is located directly below the body portion (1a) of the rotary drum (1).

(9) is a particle collecting trough, which is located above the inside of the rotating drum (1), and in the rotation axis direction of the rotating drum (1), inside the rotating drum (1). From the side to the outside, and a screw conveyor for transferring particles on the inner bottom of the screw conveyor.
(9a) is provided.

(10) is an injection nozzle, and this injection nozzle (10) is located on the upper side of the body (1a) of the rotating drum (1) and corresponds to the upper opening of the particle collecting trough (9). ), Which is provided in the direction of the rotation axis, and is provided with a large number of injection ports arranged in a row facing the upper opening of the particle collection gutter (9).

On the other hand, as shown in FIG. 3 which is an enlarged cross-sectional view of a part of FIG. An end-face sliding type seal ring (11) having an inverted Π shape, which is open to the outside in the radial direction, is attached.

These seal rings (11) are made of high abrasion resistant nitrile butadiene rubber (NBR), are fitted on the outer peripheral surfaces of the opening ends of the supporting cylinders (1c) and (1d), and are made of metal. It is firmly tightened and held by the drive band (14).

On the other hand, the surfaces of the water supply weirs (4) and (5) facing the supporting cylinders (1c) and (1d) are concentric toward the outer circumference of the seal ring (11) of the supporting cylinders (1c) and (1d). Cylindrical seal receivers (12) and (13) protruding to the inside are provided in a protruding manner. These cylindrical seal receivers (12) (13) are made of stainless steel (JIS; SUS304) with square grooves (12a) (13a) provided on the inner diameter surface of each, and can be divided into two parts in the vertical direction.
Moreover, it is provided so as to be attachable to and detachable from the water supply weirs (4) and (5).
Further, ring-shaped sliding plates (15) with low friction resistance are detachably attached to both side walls of each of the rectangular grooves (12a) and (13a).

And, the rectangular groove of each of these cylindrical seal receivers (12) (13)
In (12a) and (13a), the outer peripheral portion of the seal ring (11) annularly attached to the outer peripheral surface of the opening end of each of the supporting cylinders (1c) and (1d) has a rectangular sliding surface on both sides of the outer peripheral portion. The grooves (12a) and (13a) are fitted in contact with the surfaces of the ring-shaped sliding plate (15) on both side walls.

Also, the outer circumference of the inserted seal ring (11) and the square groove (12
a) (13a) A predetermined space is provided between the bottom and the bottom of each of the cylindrical seal receivers (11) and (12), and inside and outside of the rectangular grooves (12a) (13a). Water passage (12b) communicating with
(12c) and (13b) (13c) are punched. Then, as shown by the alternate long and short dash line in FIG. 3, these water passages (12b) (12c) and (13b) (13c) are provided with conduits which communicate with cooling water supply / discharge means not shown here. Connected, through these, in the rectangular groove (12a) (13a) of the cylindrical seal receiver (11) (12), that is, these rectangular groove (12a) (13a) and the outer periphery of the seal ring (11) The pressurized water from the supply / drainage means of the cooling water is fed / circulated in the annular space formed therebetween.

In this embodiment, the upper water passages (12b) (13b) of the cylindrical seal receivers (11) (12) are used as the outlet side, while the lower water passage ports are formed.
(12c) (13c) is the inlet side, and a pressure regulating valve is provided in the pipe line connected to the outlet side, and pressurized water for cooling is sealed in a tubular seal (11).
The rectangular grooves (12a) and (13a) of (12) are circulated from the lower side to the upper side, and the water pressure thereof can be arbitrarily adjusted by a pressure adjusting valve.

In the rotary drum type filtration device of the present embodiment having the above configuration, the raw water W with suspended particles sent through the water supply passages (6) and (7), as shown by the arrow in FIG. Water Weir (4)
It is made to flow in from both sides of the rotating drum (1) through the water passages (4a) and (5a) of (5), and then the body (1) of the rotating drum (1).
It is filtered downward through the screen panel (1b) provided around a).

Then, the filtered water is provided immediately below the body portion (1a), is collected through the filtered water channel (8) and is reused, while:
The suspended particles trapped on the screen panel (1b) by this filtration are the screen panels that accompany the rotation of the rotating drum (1).
It is lifted above the water surface by the rotational movement of (1b), and the trunk (1a)
Is dropped into the particle collection gutter (9) by a jet of water or air jetted from a jet nozzle (10) provided on the upper side of the rotary drum (1) through the particle collection gutter (9). Will be collected outside.

As described above, in the rotary drum type filtration device of the present embodiment, the raw water W is symmetrically introduced into the rotary drum (1) from both sides during the filtration, so that the flow velocity of the raw water W is high enough to obtain a predetermined flow rate. Since it is low, the disturbance of the raw water W in the rotating drum (1) is small, and since it acts so as to block the other flows, the flow velocity of each is further reduced, Almost stagnant. This reduces the movement of suspended particles in the raw water W,
The settling of suspended particles is promoted, the suspended particles can be easily captured by the screen panel (1b), the filtration efficiency is improved, and the screen panel (1
b) Wear can be prevented.

On the other hand, in the rotary drum type filtration device of the present embodiment, the rotating drum (1) that is rotating, the open ends of the supporting cylinders (1c) (1d) at both ends, and the water supply weir at the fixed position (4) (5 A seal ring (11) for sealing the raw water W between the inner and outer sides of the outer peripheral portion of the seal ring (11) is provided at fixedly arranged water supply weirs (4) and (5). These seal rings (11) are the center of rotation of the rotary drum (1) during filtration because they are of the end face sliding type that abuts and slides on both side wall surfaces of the rectangular grooves (12a) and (13a) of (13). Even if some relative runout occurs between the fixed side water supply weirs (4) and (5), the sealing effect is not impaired.

In addition, these seal rings (11) contact with both side walls of the rectangular grooves (12a) and (13a) of the cylindrical seal receivers (12) and (13) with a certain pressing force by their elasticity, and their sliding In addition to providing a surface seal, the pressure water for cooling that is supplied and circulated between the outer periphery of the rectangular grooves (12a) and (13a) spreads the outer periphery toward both sides in a reverse Π shape. The pressure on the sliding surface can be made more sufficient and even because it is urged by the rotating drum (1) and the openings at both ends and the water supply weir (4).
Leakage of raw water W between (5) can be surely prevented.

In this example, the raw water W used for water granulation of metallurgical slag and having a water temperature of 85 to 95 ° C., which was still high, was filtered. Seal ring that heats up due to dynamic friction heat (11)
Has been maintained at a temperature of 50 ° C or less by heat exchange with the cooling pressure water that is fed and circulated around its periphery, and there was no concern that it would abnormally heat up and deteriorate its wear resistance. .

By the way, as the cooling pressure water, clear water of 35 ° C. or less is used, and the water pressure is 0.5 to ¹ kg / cm ^{2 which} is higher than the water pressure due to the head of the raw water W.
Was set to. In this way, the water pressure of the cooling pressure water supplied and circulated in the rectangular grooves (12a) (13a) of the cylindrical seal receivers (12) (13) is changed to the water pressure of the raw water W in the rotating drum (1). By setting it higher, even if an unexpected break occurs in the sliding portion of the seal ring (11) on the raw water W side, the pressure water for cooling simply flows out to the raw water W side due to the water pressure difference, and Seal ring
(11) It does not leak to the outside through the outer periphery.

Further, by bringing the seal ring (11) into contact with the sliding surface with even and strong pressing force, and setting the pressure of the cooling pressure water on the outer periphery of the seal ring (11) higher than the water pressure of the raw water W, It is possible to prevent the hard particles in the raw water W from entering the sliding surface of the seal ring (11) and prevent the shortening of the service life due to abnormal wear of the seal ring (11) due to these hard particles.

In this embodiment, a seal ring is provided around the outer circumference of the open end of the supporting cylinders (1c) and (1d) at both ends of the rotary drum (1).
The configuration is such that the raw water W is sealed by the (11) and the cylindrical seal receiver (11) provided on the fixed side water supply weirs (4), (5). This is, for example, another embodiment. As shown in FIG. 4 which is an enlarged cross-sectional view of the main part of FIG. 4, in addition to these configurations, a sealing structure is provided also on the inner peripheral side of the opening ends of the supporting cylinders (1c) and (1d) to improve the sealing effect. It can be made more reliable. Here, FIG. 4 is an enlarged cross-sectional view of an essential part corresponding to FIG. 3 which is an enlarged cross-sectional view of a portion of FIG.
The same reference numerals as those in the figure are the same as those described above, and the description thereof will be omitted here.

In this alternative embodiment, the inner peripheral surface of the opening end of each of the supporting cylinders (1c) and (1d) at both ends of the rotary drum (1) has a fourth
As shown in the figure, a sliding ring (16) made of stainless steel (JIS; SUS304) having a sloped inner peripheral surface with a tilt angle of about 10 degrees toward each opening end is provided around. is there.
On the other hand, the outer surfaces of the water supply weirs (4) and (5) on the side of the supporting cylinders (1c) and (1d) are concentric with the sliding rings (16) of the supporting cylinders (1c) and (1d), and the sliding ring (16 ) A circular arc with a smaller diameter is formed, and both upper ends of the circular arc project into the open ends of the support cylinders (1c) (1d) with the upper edges of the water supply weirs (4) and (5) being approximately at the same height, and (1c) Sliding ring (16d) of sliding ring (16)
Gradient of (16)
A circular arc plate (17) made of stainless steel (JIS; SUS304) having a circular arc sloped surface whose diameter is reduced with an inclination angle of 10 degrees is provided in a protruding manner.

In addition, the slanted inner surface of the sliding ring (16) and the circular arc plate (17)
A circular arc seal member (18) having a wedge-shaped cross section is disposed between the circular arc-shaped gradient surfaces. The circular arc seal member (18) is made of highly heat-resistant ethylene propylene terpolymer rubber (EPTR), and has a semicircular arc shape in which the cross-sectional shape is a lateral trapezoid whose inner and outer peripheral surfaces are inclined at an angle of about 10 degrees. Of which the inner peripheral surface is an arc plate (17)
It is fitted between the circular arc plate (17) and the sliding ring (16) with the outer peripheral surface abutting the inner peripheral surface of the sliding ring (16).

And, this circular arc seal member (18) penetrates the wall on the outer peripheral side of the water inlets (4a), (5a) of the water supply weirs (4), (5) horizontally, and a plurality of them at equal pitches in the circumferential direction. Book-provided stainless steel
It is connected to the end of the holding shaft (19) made of (JIS; SUS304).
On the other hand, each holding shaft (19) is urged toward the anti-support cylinder (1c) (1d) side by the spring (20) provided at the end portion on the anti-arc seal member (18) side, The seal member (18) is restricted from moving in the circumferential direction by the holding shafts (19), and is urged toward the water supply weirs (4) and (5).

In this alternative embodiment, a rotating drum (1) that rotates.
The seal of the raw water W between the open ends of the support cylinders (1c) (1d) at both ends and the water supply weirs (4) (5) at the fixed position is the open ends of the support cylinders (1c) (1d). Since the inner peripheral side and the outer peripheral side of the portion are double-structured, the sealing effect can be made more reliable.

In addition, the arc seal member (18) that performs the seal on the inner peripheral side is
Sliding ring (16) of supporting cylinder (1c) (1d)
Of the spring (20) of the holding shaft (19) while contacting the inner peripheral inclined surface of the and the outer peripheral inclined surface of the circular arc plate (17) of the water supply weirs (4) and (5).
Since it is pressed by the elasticity of, even if it is worn to some extent by sliding, it can move horizontally by the elasticity of the spring (20) of the holding shaft (19) to supplement and maintain the sealing effect, and for a long time. It does not lose its sealing effect. Further, these arc sealing members (18) prevent floating particles in the raw water W from moving to the seal ring (11) side that serves as a seal on the outer peripheral side, and stabilize the sealing effect of the seal ring (11). Helps maintain long term.

[Effect of device]

As described above, the rotary drum type filtration device according to the present invention can reliably seal between the open end of the rotating rotary drum and the water supply weir arranged at the fixed position, and The sealing effect can be maintained for a long period of time, and stable filtration can be continuously performed for a long period of time without causing leakage of raw water and troubles due to leakage of raw water.

[Brief description of drawings]

FIG. 1 is a front sectional view showing a main part of a rotary drum type filtration device according to an embodiment of the present invention, FIG. 2 is a sectional view taken along the line AA in FIG. 1, and FIG.
1 is an enlarged sectional view of a portion of FIG. 1, FIG. 4 is an enlarged sectional view of a main part of a rotary drum type filtration device according to another embodiment of the present invention, and FIG. 5 is a main part of a conventional rotary drum type filtration device. FIG. (1) …… Rotating drum, (1a) …… Body, (1b) …… Screen panel, (1c) (1d) …… Supporting cylinder, (4) (5) …… Water supply weir,
(6) (7) …… Water channel, (11) …… Seal ring, (12) (13)…
… Cylindrical seal holder, (12a) (13a) …… Square groove, (12b) (12c) and (13b) (13c) …… Water inlet, (16) …… Sliding ring, (17)
…… Arc plate, (18) …… Arc seal member, (19) …… Retaining shaft, (20) …… Spring.

Claims (2)

[Scope of utility model registration request] 1. A rotary drum which is rotatably arranged in a horizontal direction, has a screen around a body, and has at least one end opened cylindrically, and a cylindrical opening end of the rotary drum. In a rotary drum type filtration device comprising a water supply weir arranged to face and having a water passage opened toward the inside of the tubular opening, and a water supply passage communicating with the water passage of the water supply weir, On the outer peripheral surface of the cylindrical opening end portion of the rotating drum, an end face sliding type seal member having a reversing Π shape whose cross-sectional shape opens in the outer diameter direction is annularly mounted while facing the rotating drum of the water supply weir. On the surface, a cylindrical seal receiving portion, which projects concentrically toward the outer circumference of the cylindrical end portion of the rotary drum and has a square groove on the inner diameter surface, is provided in a convex shape. The end face sliding type seal member on the outer periphery of the rotary drum end can be slidably rotated in the rectangular groove of the receiving part. And the cylindrical seal receiving part of the water supply weir is provided with at least two liquid passages that connect the bottom of the rectangular groove around the inner diameter surface to the outside, and the liquid passages are cooled. A rotary drum type filtration device characterized in that liquid supply / drainage means for liquid circulation are communicated with each other. 2. An inner peripheral surface of a cylindrical opening end portion of the rotary drum is formed with an annular slope surface portion whose diameter is reduced toward the opening end, while a surface of the water supply weir facing the rotary drum is provided with a rotary drum surface. A circular arc along the lower inner peripheral surface of the tubular opening end projects toward the inside of the tubular opening, and the outer peripheral surface of the inner peripheral end of the tubular opening facing the annular gradient surface portion is reduced in diameter toward the tip. An arcuate member having a shape of an arcuate sloped surface is provided in a convex shape, and the cross-sectional shape narrows toward the water supply weir side between the annular sloped surface on the inner circumference of the cylindrical end and the arcuate sloped surface of the arcuate member. And the arc-shaped seal member is connected to and held by the ammunition machine provided in the fixed part on the water supply weir side, and the movement of the rotary drum in the rotation direction is restricted. The first contract characterized by being urged toward the side of the water supply weir. Rotary drum filtering apparatus of claim wherein.