JPS6141244B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a filtration device capable of rejecting finely dusted filter media, that is, finely divided granular filter media.

Conventionally, there are various types of filtration devices in which a filter layer is formed using granular filter media such as filter sand, but when the granular filter media come into contact with each other when cleaning the filter media, the granular filter media becomes atomized and the filter layer becomes clogged. There is a drawback.

Therefore, the present invention proposes a filtration device capable of accurately rejecting fine dust particles. A partition wall 2 through which the filter medium can pass, and a discharge path for guiding the fine dust filter medium, which is formed between the partition wall 2 and the inner circumferential surface of the body of the rotating drum 1 and extends spirally along the rotational direction of the rotating drum 1. 3, a collection part 4 for fine filter media connected to a part of this discharge path 3, a discharge port 5 for rejecting the particulate filter material collected in this collection part 4 out of the rotating drum 1, and a rotating drum 1. This filtration device has a space 6 formed vertically inside the partition wall 2 and in contact with the inner circumferential surface of the partition wall 2, and a filter layer 7 made of a granular filter medium.

The filter layer 7 of the filtration device according to the present invention is formed of ordinary granular filter media, such as filter sand, which is deposited on the lower side of the rotary drum 1 to form a layer, as shown in the illustrated example. It may also be formed of a layered floating granular filter medium. When the filter layer 7 is formed of such a floating granular filter medium, the space 6 is formed on the lower side of the rotary drum 1 and the filter layer 7 is formed on the upper side, unlike the illustrated example.

Further, the first flowing water section 8 described below is located in the space section 6 on the lower side thereof, and the second flowing water section 9 is located in the filter layer 7 on the upper side thereof.

Moreover, the rotating drum 1 of the filtration device according to the present invention
The body portion is not limited to an inverted cylindrical shape as shown in the illustrated example, but may be an inverted cylindrical shape.

Based on the above, a first embodiment of the present invention will be described below with reference to FIGS. 1 and 2.

The entire surface of the partition wall 2 is formed by a filter net 10 that also functions to filter raw water,
The fine filter medium passes into the discharge passage 3 from substantially the entire surface of the partition wall 2 formed by the filter network 10.

Further, the spiral discharge path 3 has a spiral member 11 between the inner circumferential surface of the body of the rotating drum 1 and the outer circumferential surface of the partition wall 2.
It is formed by the interposition of The terminal end of the discharge path 3 is connected to the gathering part 4 through the first discharge port 13 formed in a part of the second partition wall 12.
is connected to. Further, the repelling port 5 faces the gathering portion 4.

Next, the symbols in the figure will be explained.

In the figure, reference numeral 14 denotes a first flow pipe for raw water inflow and wastewater outflow, which passes through the rotation axis of the rotary drum 1 from outside and has a first flow pipe 8 for raw water inflow and wastewater outflow located within the space 6. be. Reference numeral 15 denotes a second flowing water for filtrate inflow and washing water outflow, which passes through the rotational axis of the rotary drum 1 from outside and has a second water flow section 9 for filtrate inflow and washing water outflow located within the filter layer 7. It's a tube. The first water pipe 14 and the second water pipe 15 extending along the axis of rotation of the rotary drum 1 are formed by partitioning the middle of the same pipe body with a partition member 16 .

Further, the rotating drum 1 rotates with the first water pipe 14 and the second water pipe 15 portion extending on the rotational axis as fixed axes. Therefore, the first water pipe 1
4. The second water pipe 15 is fixed to the pedestal 17 so as not to rotate when the rotating drum 1 rotates. still,
In the present invention, the rotation operation means for the rotary drum 1 is not critical, but in the case of the filtration apparatus shown in FIGS. 1 and 2, the rotation operation is performed by the driving force of a motor (not shown).

Further, in the second water flow section 9 of the second water flow pipe 15, a portion 19 where the second water flow port 18 is provided is covered with a filter net 20, and slides into contact with the inner surface of the filter net 20 during filter medium cleaning. Sliding member 2
1 is formed between the filter net 20 and the portion 19. The sliding contact member 21 is the portion 1
It is formed of a spiral wire member wound around 9.

Returning to the explanation of the symbols in the figure again.

In the figure, reference numeral 22 denotes a discharge pipe connected to the first water pipe 14, and the discharge port 5 is connected to the discharge pipe 22.
It is formed at the tip of. In addition, this displacement pipe 22
A check valve 23 is provided in the middle, and this check valve 23 prevents water from flowing from the first water pipe 14 side to the discharge port 5 side.

Next, the filtration action of the filtration device shown in FIGS. 1 and 2 will be explained.

Raw water is made to continuously flow into the rotating drum 1 from the first water pipe 14 by operating a pump (not shown) or the like.

The raw water passes through the first water pipe 14 → the first water flow part 8 and reaches the inside of the space 6, as shown by the solid line arrow in FIG. Most of the raw water that has reached the space 6 enters the filter layer 7 from the surface of the filter layer 7 and is filtered, and then passes through the filter network 20 of the second water flow section 9 and is filtered. The water is filtered and discharged through the second water flow section 9 → the second water flow pipe 15. Further, a part of the raw water that has reached the space 6 passes through the filter network 10 of the partition wall 2 that is in contact with the space 6, is filtered, and enters the discharge path 3. Then, it passes through the filter net 10 of the partition wall 2 that is in contact with the filter layer 7, enters the filter layer 7, and is filtered, and then the filter net 2 of the second water flow section 9.
After passing through 0 and being filtered, the second flowing water section 9 → the second
It is filtered and reduced through the water pipe 15.

Further, a part of the raw water that has entered the discharge path 3 flows from the first discharge port 13 to the collection portion 4 . Then, the raw water that has reached the collection part 4 is sucked up from the drainage port 5 by the flow of raw water in the first water pipe 14 → drainage port 5 → drainage pipe 22 → first water pipe 14 →
It returns to the space 6 via the first flowing water section 8. In this way, the filtration device according to the embodiment uses the filter layer 7 for filtering raw water.
Many parts of the filter are effectively utilized, and the filter networks 10 and 20 are also effectively utilized.

Next, the cleaning action of the filtration device shown in Figs. 1 and 2 will be explained. Since the filtration device is configured so that cleaning of the filter medium and discharge of the fine filter medium can be performed at the same time, the discharge will also be explained. I will also explain.

Washing water is made to continuously flow into the rotating drum 1 from the second water pipe 15, and the rotating drum 1 is rotated. As the rotary drum 1 rotates, the granular filter media in the filter layer 7 move as shown by solid arrows in FIG. 2, and the adhering suspended solids are dissociated by rubbing the granular filter media against each other. Further, by rubbing the granular filter medium against the inner surface of the filter net 10 of the partition wall 2, the suspended matter adhering to the inner surface of the filter net 10 is dissociated.

Then, these dissociated adhering suspended solids are discharged by discharging the washing water as described below. When the filter layer 7 is formed of filter sand, the surface of the filter layer 7 is inclined at an angle of 30 degrees, which is the angle of repose of the sand, and the granular filter medium moves by continuously sliding down.

On the other hand, the previous wash water reaches the second water flow part 9 through the second water flow pipe 15 as shown by the dotted line arrow in FIG. part becomes an upward flow and washes the inside of the filter layer 7,
From the surface of the filter layer 7 to the space 6. Most of the washing water that has reached this space 6 is discharged via the first water flow section 8 → the first water flow pipe 14. In addition, the second
A part of the washing water flowing out from the second water outlet 18 of the water flow section 9 becomes a downward flow and washes the inside of the filter layer 7.
Filter net 10 of partition wall 2 when in contact with
It passes through the section and reaches the discharge passage 3. The cleaning water that has reached the discharge path 3 passes through the first discharge port 13 and reaches the collecting section 4 together with the cleaning water that has entered from the filter net 10 portion of the partition wall 2 when it comes into contact with the space 6. As the cleaning water flows in the first water pipe 14, it is sucked up from the drainage port 5, and is discharged to the outside via the drainage port 5, the drainage pipe 22, and the first water pipe 14.

In addition, during this washing, the granular filter medium and the filter net 20 are rubbed together due to the flow of the granular filter medium and the accompanying movement of the filter net 20 in the second flowing water section 9, and the turbidity, etc. on the outer surface of the filter net 20 is removed. The deposits are dissociated and removed.

Further, as the filter net 20 is moved, the filter net 20 and the sliding member 21 are also rubbed together, and the deposits on the inner surface of the filter net 20 are also dissociated and removed.

In this way, the cleaning action of this filtration device is achieved by the movement of the granular filter medium as the rotary drum 1 rotates, and the outflow of cleaning water from the second water flow section 9 in the filter layer 7 in two directions. While cleaning is carried out properly, at the same time, the fine dust filter medium is also discharged as follows.

Granular filter media made into fine dust by the above-mentioned rubbing, etc.
That is, as the rotating drum 1 rotates, the fine filter medium passes through the filter net 10 of the partition wall 2 and enters the discharge passage 3, and then is guided through the discharge passage 3 as the rotary drum 1 rotates. 1 and gather at the gathering part 4 through the discharge port 13. The particulate filter material collected in the collecting part 4 is mixed with the washing water discharged from the collecting part 4 to the outside through the displacement pipe 22, that is, along with the flow of washing water in the first water pipe 14. , due to the suction action from the ejection port 5, the ejection port 5 → the ejection pipe 2
2→The water is automatically discharged to the outside via the first water pipe 14. Therefore, although the discharge of the particulate filter medium from the discharge port 5 in this embodiment is automatically performed by discharging the washing water, the discharge port 5 according to the present invention is not limited to such a structure. Alternatively, for example, as shown in FIG. 3, a discharge port 5 with a lid 24 that can be opened and closed manually may be formed to take out the particulate filter material collected in the collecting portion 4 to the outside at a timely manner.

Next, a second embodiment of the filtration device according to the present invention will be described based on FIG. 4.

The filtration device according to the second embodiment is different from the first embodiment in that the first water pipe 14 and the second water pipe 15 pass through the rotation axis of the rotary drum 1 from the same direction side, and A part of the first water pipe 14 passes through a part of the second water pipe 15. Further, the rotary drum 1 is configured to be rotated by manual rotation operation of a handle 25 fixed to the side surface of the rotary drum 1. Other than these points, there is no fundamental difference from the first embodiment, so a description thereof will be omitted by indicating with the same reference numerals.

In the filtration device according to the present invention configured as described above, the granular filter medium becomes fine dust to produce fine dust filter medium, and when the filter layer becomes clogged due to this fine dust filter medium, the rotating drum 1 is rotated. let As the rotary drum 1 rotates, the granular filter material (including the particulate filter material) moves, and the particulate filter material enters the discharge passage 3 through the partition wall 2 portion through which it can pass. Then, the particulate filter material that has entered the discharge passage 3 is guided by the discharge passage 3 as the rotary drum 1 rotates, and collects in the collection part 4. It is rejected outside the rotating drum 1.

Therefore, according to the filtration device of the present invention, the particulate filter material intrudes into the discharge passage 3 from the part of the partition wall 2 through which it can pass, and the particulate filter material collects in the collection part 4 by being guided through the discharge passage 3. There is an advantage that the collection can be carried out properly by the rotation of the rotary drum 1. Then, the rotating drum 1 of the fine filter medium is discharged from the ejection port 5.
By expelling the particles to the outside, clogging of the filter layer 7 caused by the fine filter medium can be eliminated.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of the filtration device according to the first embodiment, FIG. 2 is a cross-sectional view of the - part of FIG. 1 during cleaning, and FIG. 3 is a partial modification of the first embodiment. Partial sectional view, FIG. 4 is a sectional view of a filtration device according to a second embodiment. Main symbols in the diagram...1: Rotating drum, 2: Partition wall, 3: Discharge path, 4: Collection section, 5: Rejection port, 6:
Space part, 7: filter layer.

Claims (1)

[Scope of Claims] 1. A partition wall 2 which is provided at intervals along the inner circumferential surface of the body of a horizontal rotating drum 1 and through which a particulate filter medium can pass; A discharge path 3 for guiding particulate filter medium is formed between the inner peripheral surfaces of the body and extends spirally along the rotational direction of the rotating drum 1.
, a particulate filter material collection part 4 connected to a part of this discharge passage 3, a discharge port 5 for rejecting particulate filter material collected in this collection part 4 to the outside of the rotating drum 1, and a part of the rotary drum 1. A space 6 formed vertically inside the partition wall 2 and in contact with the inner circumferential surface of the partition wall 2
and a filter layer 7 made of a granular filter medium. 2. The filtration device according to claim 1, wherein the filter layer 7 comprises a floating granular filter material floating in water to form a layer. 3. The filtration device according to claim 1 or 2, wherein the body is a rotating drum 1 having an oblique cylindrical shape.