JPH02280803A - Precision filtration apparatus - Google Patents

Abstract

PURPOSE:To contrive the implementation of filtration with a high degree of accuracy and eliminate the need for enlarging a specific space of a filter apparatus when a larger filtering amt. is required by performing filtration continuously using powdered filtering materiel while it is being cleaned. CONSTITUTION:Cylindrical filter chambers 12 are arranged in a circular and integral form with their centers in alignment with the rotary axis of a disk- shaped separating wall 4 rotatable in sliding contact with the inner wall of a container 1. A cylindrical filter material holder 11 having powdered filter material S filled therein is received in each filter chamber 12. A cleaning nozzle rod conduit pipe 15 is fixedly provided in a first chamber 2 in communication with a first opening 13 of each filter chamber 12 in an overlapping sequence and approximately in the coaxial line of the holders 11. A cleaning water recovery pipe 29 brought in communication with a second opening 14 of the filter chamber 12 upon communication of the pipe 15 with the first opening 13 is fixedly provided in a second chamber 3. Also provided is a cleaning nozzle rod 19 capable of moving back and forth coaxially of the holders 11 through the pipe 15.

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to a precision filtration device, and more particularly, to a precision filtration device that is configured to be able to perform filtration processing with high accuracy and to also be able to clean the filter medium while continuing filtration processing.

[Conventional technology]

There are various types of filtration devices, and one of them that has the highest filtration accuracy is a sand filtration device. As shown in FIG. 4, this filtration device is provided with a saw-shaped sand tray d inside a main body container a that partitions the internal space into an upper raw water introduction chamber and a lower filtrate outflow chamber C. It is constructed by loading sand e on this sand tray d. The raw water that has flowed into the raw water introduction chamber is filtered as it passes through the sand layer, and this filtered water is transferred to the sand tray d.
The filtrate flows out from the many small drain holes (as shown) in the chamber C.
The filtered water flows down and is discharged from the filtrate outflow chamber C to the outside. In the case of a filtration device using such a granular filter medium, the filtration process is performed in multiple layers when the raw water passes through the filter medium layer, so the filtration accuracy is very high.

[Problem to be solved by the invention]

However, this conventional sand filter device has the following problems. Foreign matter removed from raw water accumulates in the sand layer, and as the amount of foreign matter increases, the filtration ability decreases, so it is necessary to wash the sand frequently. This collects water in the raw water introduction chamber mentioned above,
This is done by stirring the water with sand. Foreign matter stuck between the sand is released from the sand and flushed out along with the water through the drain hole. However, when washing this sand, the filtration process must be completely interrupted.On the other hand, in order to be able to continue the filtration process, at least one similar device must be installed to It had to be configured in multiple formats. In addition, since the filtrate flows down into the filtrate outflow chamber only from the bottom surface of the sand layer, in order to increase the amount of filtrate that flows out into the filtration outflow chamber per unit time, that is, the amount of treatment per unit time, the above-mentioned The diameter CD> of the sand layer must be increased. In other words, in order to increase processing capacity,
The device must be made larger, and its exclusive space becomes larger. The present invention was devised under the above circumstances, and is capable of performing filtration with high precision, eliminates the need to interrupt the filtration process when cleaning the filter medium, and reduces the throughput. To provide a filtration device configured so that it is not necessary to expand the exclusive space of the device when increasing the temperature.

[Means to solve the problem]

In order to solve the above problems, the present invention takes the following technical measures. That is, the precision filtration device of the present invention is provided with a disc-shaped partition wall that divides the internal space of the container into a first chamber and a second chamber and rotates while slidingly contacting the inner circumferential wall of the container. A filtration device in which a plurality of filtration chambers each having a cylindrical internal space are integrally formed in the partition so as to be lined up in a circle around the rotation axis of the partition, and each filtration chamber has an outer peripheral wall. A cylindrical filter medium holder having a large number of drain holes and loaded with a granular filter medium is housed therein, and one end of the filter medium holder is communicated with a first chamber at the end of the first chamber side of the filter chamber. A first opening is formed, and a second opening is formed at the second chamber side end of the filtration chamber to communicate the outer space of the filter medium holder with the second chamber; At a given position,
A cleaning nozzle rod introduction pipe that sequentially overlaps and communicates with the first opening of each of the filtration chambers and is located approximately on the same axis as the filter medium holder is fixedly provided in the first chamber, and the cleaning nozzle A wash water recovery pipe is fixedly provided in the second chamber, which communicates with the second opening of the filtration chamber when the rod introduction pipe communicates with the first opening, and the washing water recovery pipe passes through the washing nozzle rod introduction pipe and communicates with the second opening of the filtration chamber. It is characterized by being equipped with a cleaning nozzle rod that can move forward and backward within the filter medium holder in its axial direction.

[Action and effect]

For example, raw water is introduced into the first chamber of the main container, and this is
When performing filtration treatment by flowing water from the filtration chamber into the second chamber through the filtration chamber, the raw water in the first chamber flows into the filter media holder from the first opening of the filtration chamber.6 The raw water that flows into the filter media holder When passing through the filter media gap in the filter media holder, it is filtered in multiple layers, and then flows out from the drain hole of the filter media holder into the outer space of the filter media holder. At this time,
Foreign matter filtered from raw water is buried between the granular filter media. The filtered water that has flowed into the outer space then flows into the second chamber through the second opening of the filtration chamber, and is discharged from the second chamber into the external pipe. By the way, when the partition wall is rotated so that the first opening of one filtration chamber matches the position of the cleaning nozzle rod introduction pipe and the second opening of the filtration chamber matches the position of the washing water recovery pipe, The filtration chamber or the cleaning nozzle rod introduction pipe and the cleaning water recovery pipe are in continuous communication while being sealed from other spaces. In this state, the cleaning nozzle rod
The cleaning nozzle rod can enter the filter medium holder in the filtration chamber through the introduction pipe. The cleaning nozzle rod enters into the filter medium holder without jetting cleaning water, scatters the granular filter medium in the filter medium holder with the cleaning water, and enters into the filter medium holder while forming an entry path. , the granular filter medium is stirred together with the water in the holder, and therefore, the foreign matter stuck between the granular filter medium is released from the filter medium by the above-mentioned filtration process, and is discharged from the drain hole of the filter medium holder along with the washing water to the outer space of the filter medium holder. is washed away. That is, the granular filter medium is washed, and foreign substances stuck between the filter medium can be removed. Then, the cleaning water containing foreign matter flows out from the second opening of the filtration chamber to the cleaning water recovery pipe, and is discharged to the outside from the cleaning water recovery pipe. On the other hand, when cleaning granular filter media in this way, as mentioned above, a four-person cleaning nozzle, a filtration chamber for cleaning,
The cleaning water recovery pipe does not communicate with the first chamber or the second chamber, and the granular filter media and cleaning water stirred during cleaning may flow out, or raw water or filtered water may enter the cleaning nozzle rod introduction pipe. There will be no leakage. therefore,
There is no problem in continuing the filtration process using a filtration chamber other than the filtration chamber involved in cleaning, and the granular filter media in some of the filtration chambers can be washed while performing the filtration process. As described above, with the precision filtration bag r of the present invention, filtration treatment can be performed continuously while cleaning the filter medium. Moreover, since the filtration process is performed using a granular filter medium, the filtration accuracy is also high. In addition, when the filtered water flows out into the second chamber as described above, the filtered water flows out of the filter medium holder from the numerous drain holes formed on the outer peripheral wall of the cylindrical filter medium holder, and leaves the filter holder per unit time. In order to increase the amount of filtered water flowing out, that is, the throughput per unit time, it is sufficient to make the cylindrical holder longer, and there is no need to increase the diameter of the cylindrical holder. Therefore, if the cylindrical holder is installed vertically in the device, there is no need to increase the size of the device in the horizontal direction in order to increase processing capacity, and there is no need for a large amount of dedicated space. .

[Description of Embodiments] Hereinafter, embodiments of the present invention will be specifically described with reference to the drawings. As shown in FIG. 1, the main body container 1 has an almost upright cylindrical shape as a whole, and has a disk-shaped partition wall inside thereof that partitions the internal space into an upper first chamber 2 and a lower second chamber 3. 4 are provided. An inlet pipe 5 for introducing raw water into the first chamber 2 is provided on the side outer wall of the first chamber 2 . Further, an outlet pipe 6 for discharging the filtered water to the outside is provided on the side outer wall of the second chamber 3. The partition wall 4 is attached to a drive shaft 9 that is rotationally driven by an electric motor 8 attached to the upper part of the ceiling plate 7 of the container 1. When the electric motor 8 is started, the outer periphery slides against the inner peripheral wall of the container l. It rotates around the drive shaft 9. Further, above the partition wall 4, a disk-shaped slide plate 10 fixedly fitted onto the drive shaft 9 is arranged at a predetermined interval. Between this slide plate 10 and the partition wall 4,
In this example, a plurality of filtration chambers 12 each having a cylindrical internal space for accommodating a cylindrical filter medium holder 11 are integrally formed so as to be arranged in a circle around the drive shaft 9. 12 is constituted by a cylindrical tube interposed between the slide plate 10 and the partition wall 4. Further, a first opening 13 is provided at the upper end of the filtration chamber 12 on the side of the first chamber, and is provided with a first opening 13 that communicates the inside of the filter medium holder 11 with the second chamber 2, and at the end of the lower part on the side of the second chamber. A second opening 14 that communicates the outer space of the filter medium holder 11 with the second chamber 3 is provided. The filter medium holder 11 has its upper and lower ends connected to the slide plate 1.
0 and the partition wall 4, respectively, and are provided in the filtration chamber 12, and only the upper end thereof is opened, so that the first opening 13 and the inside of the holder communicate with each other. In addition, the filter medium holder 11 has an upper non-communicating cylindrical portion 11.
a and a lower communicating cylindrical portion 11b. The drain holes 4C provided in the filter medium holder 11 are not formed at all on the outer circumferential wall of the non-communicating cylindrical portion 11a, and as shown in FIG. is forming. Note that the communication cylinder portion 11b is, for example,
It can be constructed by a mesh tube or the like formed by winding metal wires into a coil and fixing each metal wire with a connecting member so that gaps are formed at a constant interval between adjacent metal wires. Then, as shown in FIGS. 1 and 3, sand S used as a granular filter medium is loaded into the filter medium holder 11 up to the middle height of the non-communicating cylindrical portion 11a. For convenience of illustration, in FIG. 3, the sand S and the drain hole 4 are
c is shown larger than it actually is. Needless to say, the size of the water drain hole 4C is smaller than the sand S. On the other hand, in the -th chamber 2, the drive shaft 9 of the filter medium holder 11 is
A cleaning nozzle rod introduction pipe 15 that can overlap on the same axis as the first opening 13 of the filtration chamber 12 is provided at a position that is the same distance as the distance from the cleaning nozzle rod introduction pipe 15 . This cleaning nozzle rod introduction pipe 1
5 extends into the second chamber 3 from the ceiling plate 7 of the container 1, and its lower surface is in close contact with the upper surface of the slide plate 10 while smoothly sliding in rotation of the slide plate 10. A nozzle 16 is inserted. The nozzle 16 is biased downward by a compression coil spring 17 loaded in the cleaning nozzle rod introduction pipe 15, and is elastically pressed against the slide plate IO. A piston cylinder 18 is connected to the upper end of the cleaning nozzle rod introduction pipe 15 protruding from the ceiling plate 7 of the container l, and a cleaning nozzle rod 19 is connected to the piston cylinder 18 and the cleaning nozzle rod introduction pipe 15. Decorated. In this example, as shown in FIG. 2, the cleaning nozzle rod 19 includes a cylindrical piston rod portion 20 with open upper and lower ends, and a cleaning water injection nozzle added to the tip of the piston rod portion 20. 21, and a large-diameter piston portion 22 that is wrapped around the upper end portion of the piston rod portion 20. The piston rod portion 20 is slidably inserted into a rod insertion hole 18a formed in the bottom of the piston cylinder 18, and projects into the cleaning nozzle rod introduction pipe 15 from the rod insertion hole 18a. Further, the cleaning water injection nozzle 21 is connected to the piston rod portion 20.
A cylindrical cleaning water introduction pipe 2 screwed onto the lower end spiral portion 20a of the
3, and a nozzle cap 24 that is screwed onto the tip of the cleaning water introduction pipe 23 and has an axial hole 24a that communicates with the pipe hole of the cleaning water introduction pipe 23. The nozzle cap 24 is provided with a plurality of cleaning water injection nozzle holes 25 communicating with the axial hole 24a at the tip and its peripheral portion. As will be described later, the cleaning water flowing into the piston rod portion 20 is transferred to the cleaning water introduction pipe 23.
The cleaning water is ejected from the cleaning water injection nozzle hole 25 through the axial hole 24a. Further, the piston portion 22 is attached to the piston rod portion 20 in an unremovable manner by screws 26 and 26 screwed onto the upper end portion of the piston rod portion 20, and the outer periphery of the piston cylinder 18 is It is attached to the inner wall. Piston cylinder 1 that slides and guides this piston part 22
8 is provided with a water supply port 27 above the piston portion 22 in the axial direction, and an air port 28 below the piston portion 22. The water supply port 27 passes through a high-pressure washing water supply source (not shown) via a valve device, while the air port 28
is connected to a valve device (not shown) via an air duct. Further, in the piston cylinder 18, below the piston portion 22, an air piston chamber 18b is formed with a certain degree of airtightness. In this example, cleaning water is introduced into the piston cylinder 18 from the water supply port 2.degree. 7, and the cleaning nozzle rod 19 is moved back and forth in the axial direction. The water pressure of the cleaning water flowing into the piston cylinder 18 can push down the piston part 22 and the cleaning nozzle rod 19, and the repulsive force of the compressed air piston chamber 18b can push the cleaning nozzle rod 19 back. I can do it. Thereby, the cleaning nozzle rod 19 can be advanced into the filter medium holder 11 from the cleaning nozzle rod introducing pipe 15, as will be described later. Also, at this time, the cleaning water that enters into the piston rod portion 20 from the upper end opening,
The water is ejected from the washing water injection nozzle hole 25 of the washing water injection nozzle 21. In addition, cleaning nozzle rod 1
The movement stroke 9 is sufficient to allow the cleaning water injection nozzle 21 to move forward and backward within the filter element 11 over its entire axial length. In addition, the cleaning nozzle rod 19
The descending speed of can be easily adjusted by adjusting the opening degree of the valve device connected to the air port 28. Further, in the -th chamber, a second opening 1 of the filtration chamber 12 is located on the same axis as the cleaning nozzle rod introduction pipe 15.
A wash water recovery pipe 29 is provided which can be overlapped on the same axis as 4. The wash water recovery pipe 29 is introduced from the side wall of the container 1, and has a nozzle 30 at its upwardly extending tip, the upper end surface of which slides into close contact with the lower surface of the partition wall 4 when the partition wall 4 rotates. The jacket is slidable in the axial direction. Note that this nozzle 30 is urged upward by a compression coil spring 31 loaded in the wash water recovery pipe 29.
It is elastically pressed against the partition wall 4. Further, the wash water recovery pipe 29 communicates via a valve device 32 with an open end or a low pressure source (not shown). Next, the operation of the present filtration device configured as described above will be explained. First, during normal filtration processing, the partition wall 4 is stopped. The raw water flowing into the second chamber 2 from the artificial pipe 5 is passed through each filtration chamber 12.
It enters the filter medium holder 11 through the first opening 13 at the upper end of the filter, and is filtered when passing through the sand layer (S) inside the filter medium holder 11. The filtered water flows out into the outer space of the filter medium holder 11 from the drain hole of the communication cylinder part 11b of the filter medium holder 11, and further flows into the second chamber 3 through the second opening 14 of the filtration chamber 12, and flows into the second chamber 3. 3 through an outlet pipe 6 to an external line. As the filtration process is repeated, if foreign matter removed from the raw water becomes buried in the filtration gap of the sand layer (S), it becomes necessary to remove it. This can be easily known by detecting that the differential pressure of the sand S has exceeded a predetermined value.Therefore, when the differential pressure has exceeded a predetermined value, the cleaning process for the sand S is automatically performed. Alternatively, the cleaning process may be carried out manually.The sand S can be cleaned by rotating the partition walls 4 in steps at regular intervals, for example, to clean each filtration chamber 12. This is done by aligning the position with the cleaning nozzle rod introduction pipe 15 and the cleaning water recovery pipe 29, and in synchronization with this, keeping the valve device connected to the water supply port 27 open for a predetermined period of time.In this state, The cleaning nozzle port, the introduction pipe 15, the cleaning water recovery pipe 29, and the filtration chamber 12 are sealed with a certain degree of sealing performance.The cleaning nozzle rod is pushed down by the water pressure of the cleaning water flowing into the piston cylinder 18. 19 enters the filter medium holder 11 and reciprocates within the filter medium holder 11 over its entire length in the axial direction.At this time, the cleaning nozzle rod 19 sprays cleaning water from the cleaning water injection nozzle holes 25... , as shown in FIG. 3, the sand S is scattered by the washing water and enters the filter medium holder 11 while forming an entrance path.Therefore, the sand S is stirred together with the water in the holder, and as a result, The foreign matter stuck between the sands is released from the sand S and flushed out together with the washing water from the drain hole of the communicating cylinder portion 11b of the filter medium holder l1 into the outer space of the filter medium holder 11. Therefore, the foreign matter is released from the sand layer. The foreign matter is removed.The wash water containing the foreign matter flows out from the second opening 14 of the filtration chamber 12 to the wash water recovery pipe 29.
is discharged to the outside. Note that the downward movement of the cleaning nozzle loft 19 is started with the valve device 32 connected to the cleaning water recovery pipe 29 closed and water stored in the filtration chamber 12, and as the cleaning nozzle rod 19 moves downward, the above-mentioned The valve device 32 is gradually opened. Then, after a certain period of time has elapsed, the partition wall 4 is rotated step by step, and the sand S in the filter medium holder 11 of the next filter chamber 12 is washed in the same manner as above, and this wash is applied to all the filter chambers 12. repeated in. By the way, each nozzle 16° 30 attached to the tip of the cleaning nozzle rod introduction pipe 15 and the cleaning water recovery pipe 29 is in close contact with the upper surface of the slide plate 10 and the lower surface of the partition wall 4, respectively. The tube 15 and the like are sealed to the outside with a certain degree of sealing performance. Therefore, since the stirred sand S will not flow out into the -th chamber 3, the filtration chambers 12 and 12 other than the filtration chamber 12 being washed
... allows the filtration process to continue. In addition, in this filtration device, since filtration is performed using a granular filter medium, the filtration accuracy is also good. Moreover, in this example,
The filter medium holder 11 is provided with the non-communicating cylindrical portion 11a, and the sand S is loaded up to the middle height of the non-communicating cylindrical portion 11a so that the raw water always passes through the sand layer over a certain vertical range. There will be no inconvenience such as the water flowing out of the filter medium holder without passing through the sand layer. By the way, the scope of the present invention is not limited to the embodiments described above. For example, in the embodiments described above, raw water is introduced into the first upper chamber, and filtered water is caused to flow into the lower second chamber. However, this water flow can also be reversed. In this case, a substantially circular plate-shaped filter medium outflow prevention net having approximately the same size and having a notch at a position corresponding to the cleaning nozzle rod introduction pipe is fixed on the slide plate. It is recommended that the
Further, in this case, it is preferable to use a cylindrical filter element having a large number of filter gaps in the filter medium holder, thereby making it possible to further improve the filter accuracy. Further, in the above embodiments, sand is used as the filter medium, but it goes without saying that the filter medium is not limited to this. On the other hand, various mechanisms for driving the cleaning nozzle rod are conceivable; for example, an air cylinder device may be used to move the cleaning nozzle rod. Also,
This rank and
A binion mechanism can also be arranged to move the cleaning nozzle rod. Other than this, any particular type may be used as long as the cleaning nozzle rod can be moved in the same direction in the axial direction.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view of an embodiment of the present invention, and FIG. 2 is a sectional view of a cleaning nozzle rod and its surrounding area according to the embodiment.
FIG. 3 is an explanatory diagram of the operation of the embodiment, and FIG. 4 is a diagram showing a conventional example. 1... Container, 2... Second chamber, 3... Second chamber, 4...
... partition wall, 11 ... filter medium holder, 12 ... filtration chamber,
13...first opening, 14...second opening, 15...
Washing nozzle rod introduction pipe, 19... Washing nozzle rod, 29... Washing water recovery pipe, S... Granular filter medium (sand).

Claims (1)

[Claims] (1) Inside the main container, a disk-shaped partition wall is provided that divides the internal space of the container into a first chamber and a second chamber, and that rotates while slidingly contacting the inner circumferential wall of the container. A filtration device in which a plurality of filtration chambers each having an internal space are integrally formed so as to be arranged in a circle around the rotation axis of the partition wall, and each of the filtration chambers has a large number of drainage holes in the outer peripheral wall. a cylindrical filter medium holder loaded with a granular filter medium therein, and a first opening that communicates one end of the filter medium holder with the first chamber is formed at the first chamber side end of the filter chamber; A second opening is formed at the second chamber side end of the filtration chamber to communicate the outer space of the filter medium holder with the second chamber, and at a predetermined position on the rotational circumference of each of the filter medium holders,
A cleaning nozzle rod introduction pipe that sequentially overlaps and communicates with the first opening of each of the filtration chambers and is located approximately on the same axis as the filter medium holder is fixedly provided in the first chamber, and the cleaning nozzle A wash water recovery pipe is fixedly provided in the second chamber, which communicates with the second opening of the filtration chamber when the rod introduction pipe communicates with the first opening, and the washing water recovery pipe passes through the washing nozzle rod introduction pipe and communicates with the second opening of the filtration chamber. A precision filtration device comprising a cleaning nozzle rod that can move forward and backward within a filter medium holder in its axial direction.