JPH0924254A - Filter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify the structure of a gas supply mechanism by which a hollow yarn membrane in a module cylinder is cleaned by supplying gas into the module cylinder and to reduce the cost of equipment. SOLUTION: A hollow yarn membrane is provided in the inside of a module cylinder 14. A module line is formed by arranging the module cylinders 14. A branched flow path 62 is individually prepared for adjacent two module lines. The branched flow path 62 is arranged between adjacent two module lines and in the low parts of the module lines. The respective branched flow paths 62 are connected to a main flow path 61. Further, opening parts are formed on the sides of the main flow path 61 and the branched flow path 62 in correspondence to the open end of the lower part of the module cylinder 14. Gas is supplied from the outside of a vessel 10 to the main flow path 61 and spouted from the opening parts of the main flow path 61 and the branched flow path 62. The hollow yarn membrane is cleaned by flowing the spouted gas into the module cylinder 14 from the open end of the lower part.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a filtration device, and more particularly to a filtration device having a structure for cleaning a filtration module by introducing gas into a tubular filtration module.

[0002]

2. Description of the Related Art In a filtration device for filtering a liquid to be purified, the filtration performance of a filtration module deteriorates due to long-term purification. When the filtration performance deteriorates, the filtration module is washed and reused. In this case, in the filtration device using the hollow fiber membrane module, gas is supplied from the lower side of the hollow fiber membrane module to shake the hollow fiber for cleaning, but it is supplied to each hollow fiber membrane module. If the gas flow rate is too low, the cleaning effect will be reduced, and if it is too high, the life of the hollow fibers will be shortened. Therefore, it is necessary to uniformly supply the gas to each hollow fiber membrane module. Such a hollow fiber membrane module
As a conventional filtering device using a filter, for example, there is one proposed by the following publications.

In this publication, a lower partition plate having an outlet is provided immediately below each hollow fiber membrane module, and a plurality of small holes are provided to open the upper and lower sides. The upper end of the cylinder is connected to the outlet of the lower partition plate, and an air supply pipe is provided below the lower partition plate.
After the gas supplied from the air supply pipe is accumulated in layers under the lower partition plate, it is supplied to each hollow fiber membrane module through the small hole of the cylinder and the outlet of the lower partition plate.

In this publication, an air supply pipe is provided for each row of hollow fiber membrane modules, and a short pipe having a small hole immediately below each hollow fiber membrane module is disclosed. It is connected to an air supply pipe, and air is supplied to each hollow fiber membrane module through the air supply pipe, the short pipe, and the small holes.

[0005]

However, the following problems exist in each of the above-mentioned prior arts. That is, in the above, a large lower partition plate inscribed in the container is required, and the thickness of the gas layer formed under the lower partition plate is made uniform so that each hollow fiber membrane module is evenly distributed. To supply air, it is necessary to connect multiple air supply pipes to the container,
There is a drawback that the equipment cost becomes high.

In addition, in the above, it is necessary to provide an air supply pipe for each row of the hollow fiber membrane module and a short pipe having a complicated structure. In this case as well, there is a drawback that the equipment cost similarly increases. .

An object of the present invention is to provide a filtration device which can reduce the cost of equipment by simplifying the structure of the air supply equipment for supplying the gas for cleaning the filtration module.

[0008]

In order to achieve the above object, the present invention provides a container and a plurality of tubular filtration modules arranged in a zigzag lattice or a square lattice in the container. A filtration device comprising: a water supply means for supplying the liquid to be purified into the container, and passing the liquid to be purified supplied into the container through the tubular filtration module, thereby purifying the liquid to be purified. Of the filtration module rows formed by arranging the tubular filtration modules, one branch flow path is provided for two adjacent filtration module rows, and the branch flow path is provided. Between the two adjacent filtration module rows and below the filtration module row, and an opening is formed in the side surface of the branch flow passage corresponding to the lower open end of each tubular filtration module. And the branch channel is connected to the main channel leading to the outside of the container. Then, the gas supplied from the outside of the container into the main channel is ejected from the opening of the branch channel, and the ejected gas is introduced into the tubular filtration module from the lower open end. It is characterized in that the tubular filtration module is washed.

An opening for ejecting gas may be formed in the main flow path at a location corresponding to the lower open end of the tubular filtration module. It is preferable that the opening is formed horizontally or downward. Further, the main flow path and the branch flow path may be configured by piping, or a channel member whose upper surface and both side surfaces are surrounded by flat plates and whose lower surface is open.

In the above filtering device, an auxiliary flow passage having a flow passage cross-sectional area larger than the opening area of the opening and one end thereof connected to the opening can be provided horizontally or downward, and the auxiliary flow thereof can be provided. The other end of the passage may be arranged substantially directly below the lower open end of each of the tubular filtration modules. The auxiliary flow path may be formed by piping or a channel member whose upper surface and both side surfaces are surrounded by flat plates and whose lower surface is open.

Further, in the above-mentioned filtering device, an auxiliary flow channel having a flow channel cross-sectional area larger than the opening area of the opening and having side faces connected to the opening can be provided vertically or inclined. It is preferable that the upper end of the auxiliary flow channel is disposed substantially directly below the lower open end of each of the tubular filtration modules. Further, the auxiliary flow path can be configured by a pipe whose upper and lower ends are open.

Further, according to the present invention, a container, a plurality of cylindrical filtration modules arranged in a zigzag lattice or a square lattice in the container, and a water supply means for supplying the liquid to be purified into the container. In the filtration device for purifying the liquid to be purified by passing the liquid to be purified supplied into the container through the cylindrical filtration module, each of the cylindrical filtration modules is arranged. Among three adjacent filtration module rows, one channel member having an upper surface and two side surfaces surrounded by a flat plate and an open lower surface is prepared for each of three adjacent filtration module rows. Three filtration modules with adjacent components
Of the cylindrical filtration modules, which is arranged directly below the central filtration module row, and is arranged on the upper surface of the channel member so as to correspond to the lower open ends of the tubular filtration modules forming the central filtration module row. An opening is formed on both side surfaces of the channel member so as to correspond to the lower open ends of the tubular filtration modules forming the filtration module rows on both sides, and the outside of the container. The channel member is connected to a main flow path leading to, and gas supplied from the outside of the container into the main flow path is ejected from openings on the upper surface and both side surfaces of the channel member, and the ejected gas is formed into the tubular shape. By introducing it into the filtration module from the lower open end,
The tubular filtration module is characterized by being washed. A hollow fiber membrane is housed inside the above-mentioned tubular filtration module.

[0013]

According to the above construction, when cleaning the tubular filtration module, gas is supplied from the outside of the container to the main flow path,
The gas is ejected from the openings of the main channel and the branch channels. The gas ejected from each opening becomes bubbles and rises by buoyancy, and is introduced into the filtration module from the lower open end. Then, the hollow fiber membrane in the filtration module is shaken to wash the hollow fiber membrane.

In the filtration device having the above structure, one branch flow path is arranged for two adjacent filter module rows, so that one branch flow path is arranged for each of the filtration module rows. It is possible to reduce the number of branch flow paths by half as compared with the conventional one, and thus it is possible to reduce the equipment cost. Further, by appropriately setting the flow passage cross-sectional area of the main flow passage, the flow passage cross-sectional area of the branch flow passage, and the opening area of the opening provided in the branch flow passage, the gas flow rate supplied to each filtration module Can be made uniform.

Further, by providing an opening in the main flow passage as in the branch flow passage, the filtration module can be effectively washed. Further, by making the openings horizontal or downward, it is possible to prevent impurities such as clad gravity falling in the liquid to be purified from flowing into the main channel or the branch channels from the openings.

If an auxiliary channel is provided in the branch channel,
Since the front end or the upper end of the auxiliary flow path is arranged substantially directly below the lower open end of the tubular filtration module, the supplied gas can be more reliably flowed into each tubular filtration module.

[0017]

Embodiments of the present invention will be described below with reference to the drawings. (First Embodiment) A first embodiment of the present invention will be described with reference to FIGS. As shown in FIG. 1, the filtration device of the present invention includes a container 10, and in the container 10, a separator plate 12 that supports a hollow fiber module 11 having a tubular shape is provided. The hollow fiber membrane module 11 includes a hollow fiber membrane 13 having a filtering function.
And a module tube 14 that houses the hollow fiber membrane 13. A water supply pipe 15 is provided below the container 10, and the liquid to be purified is introduced into the container 10 from the outside through the water supply pipe 15. Further, a water supply mechanism 50 is provided in the lower portion of the container 10, and the liquid flowing in via the water supply pipe 15 is supplied to the hollow fiber membrane module 11 with uniform velocity distribution.

In the container 10, an air supply mechanism 60 is provided between the water supply mechanism 20 and the hollow fiber membrane module 11, and the air supply mechanism 60 communicates with the outside through the air supply pipe 16. The air supply mechanism 60 is used when the hollow fiber membrane 13 of the hollow fiber membrane module 11 is washed, and the gas introduced from the outside through the air supply pipe 16 is evenly distributed into the container 10 and ejected. In order to do so, it has a main channel 61 and a branch channel 62. The air supply mechanism 60 is a characteristic part of the present invention, which will be described in detail later.

An outflow pipe 17 is provided at the upper part of the container 10.
Exhaust pipes 18 are provided below the separators 12, respectively. The outflow pipe 17 is for discharging the liquid after being filtered by the hollow fiber membrane module 11, and the exhaust pipe 18 is supplied from the air supply mechanism 60 and is used for cleaning the hollow fiber membrane module 11. The gas is discharged to the outside of the container 10.

Further, a drain pipe 19 is provided at the bottom of the container 10, and impurities such as clad generated by cleaning the hollow fiber membrane module 11 can be discharged from the drain pipe 19 to the outside of the container 10.

In the filtration device having the above-described structure, during normal operation, the liquid to be purified flows in from the water supply pipe 15 and the water supply mechanism 50.
Then, the velocity distribution is made uniform in the container 10 and supplied to the hollow fiber membrane module 11. And the liquid to be purified is
And the impurities such as clad are filtered by the hollow fiber membrane 13 and then flow out from the outflow pipe 17.
Impurities are captured in the hollow fiber membranes 13 by such a filtration operation, but if the filtration function of the hollow fiber membranes 13 deteriorates, it is necessary to wash the hollow fiber membranes 13.

In this case, the supply of the liquid to be purified is stopped, the gas is caused to flow through the air supply pipe 16, and the gas is evenly supplied to each module cylinder 14 via the air supply mechanism 60.
The hollow fiber membrane 13 is shaken by the flow of gas, and the trapped impurities are released. The separated impurities are discharged from the drain pipe 19 together with the liquid to be purified after the cleaning is completed.

On the other hand, at the time of this cleaning, the gas supplied to the module cylinder 14 flows out from the hole provided in the upper part of the module cylinder 14 and is exhausted from the exhaust pipe 18. In such a filtering device, the structure is made simpler and the equipment cost is lower, the velocity distribution of the liquid to be purified in the container 10 is made uniform, and the gas is uniformly supplied to each of the module cylinders 14. There is a need. In particular, if the gas flow rate flowing into the module cylinder 14 is too low, the cleaning effect of the hollow fiber membrane 13 will be weak, and if it is too high, the life of the hollow fiber membrane 13 will be shortened.
It is important to supply gas evenly into each module tube 14. The structure of the air supply mechanism 60, that is, the mechanism for uniformly supplying the gas into each module cylinder 14, will be described in detail below.

2 and 3 show the detailed structure of the air supply mechanism 60. FIG. 2 is a sectional view taken along the line AA of FIG.
FIG. 3 is a part of a cross-sectional view taken along the line BB of FIG. The air supply mechanism 60 includes a main flow passage 61 arranged below the module cylinder 14 and a plurality of branch flow passages 62 connected to the main flow passage 61.
And the branch flow path 62 has two rows of the module rows formed by arranging the module tubes 14.
It is located between the rows. Here, the module cylinder 1
4 are arranged in a houndstooth pattern, but a module cylinder 14
The branch channels 62 can also be arranged in the same manner when the cells are arranged in a square lattice. Horizontal or downward openings 63 and 64 are provided on both sides of the main flow path 61 and the branch flow path 62, respectively. In this embodiment, the main channel 61 and the branch channel 6
2 is composed of piping.

The openings 63 and 64 are, as shown in FIG.
For example, most of the gas flowing out from the opening 64 is provided within the range directly below the module cylinder 14 so that the gas flows into the module cylinder 14 by the buoyancy in the liquid to be cleaned.
That is, the opening 63 of the main flow path 61 or the opening 64 of the branch flow path 62 is provided corresponding to the lower open ends of all the module cylinders 14. In this way, the branch channel 62
By arranging between the two module rows and providing the openings 64 on both side surfaces of the branch flow passage 62, it becomes possible to obtain the minimum necessary structure and equipment, and the equipment cost can be reduced as compared with the prior art. It can be significantly reduced.

The openings 63 and 64 are arranged so that most of the gas ejected from the openings 63 and 64 flows into the respective module cylinders 14 by the buoyancy in the liquid to be cleaned. Since it is provided within the range immediately below, the gas flowing out from each opening 63, 64 can be surely made to flow into each module cylinder 14, and the opening 63, 64 is provided.
By properly adjusting the area of each module cylinder 1
It is possible to make the gas flow rate flowing into 4 uniform. Furthermore, by opening the openings 63 and 64 horizontally or downward, impurities such as clad do not flow into the main flow path 61 or the branch flow path 62 from the openings 63 and 64 by gravity.

Next, the structure for supporting the main flow path 61 and the branch flow path 62 on the container 10 will be described. As shown in FIG. 2, the branch channel 62 is supported by support rods 68, and both ends of the support rods 68 are fixed to the inner surface of the container 11 by support metal fittings 69.
Further, one end of the main channel 61 is fixed to the inner surface of the container 11 by a support fitting 67.

5 and 6 show the structure of the support fitting 67, FIG. 5 is a plan view thereof, and FIG. 6 is a side view thereof. As shown in both figures, the support fitting 67 is a lower support fitting 67A.
And the upper support fitting 67B. The lower support fitting 67A is welded to the inside of the container 10,
7B is fixed to the lower support fitting 67A with, for example, bolts. The support fitting 69 that supports the support rod 68 has the same configuration as the support fitting 67 of the main flow path 61. With such a configuration, the air supply mechanism 60 is inserted into the container 10,
After placing one end of the main flow path 61 on the lower support fitting 67A, the other end of the main flow path 61 is inserted into and connected to the air supply pipe 16 connected to the container 11 as shown in FIG. By fixing the metal fitting 67B to the lower support metal fitting 67A, the air supply mechanism 60 can be easily assembled.

8 and 9 show the detailed structure of the water supply mechanism 50. FIG. 8 is a front view thereof, and FIG. 9 is a sectional view taken along line CC of FIG.
It is sectional drawing along the line. As shown in both figures, the water supply mechanism 5
0 is, for example, a water supply device 51 connected to the water supply pipe 15 and provided with a first liquid outlet 52, and a first liquid outlet 52.
And a liquid rectifier 53 provided with a second liquid outlet 54 surrounding the liquid rectifier 53. Second liquid outlet 5
The area of No. 4 is larger than the area of the first liquid outlet 52. First liquid outlet 52 and second liquid outlet 54
A first liquid outlet 52 and a second liquid outlet 54 are provided downward so that the liquid flows downward from the horizontal direction. First liquid outlet 52 and second liquid outlet 5
4 may be a plurality of slits or a plurality of holes.

In the water supply mechanism 50 of this embodiment, the area of the second liquid outlet 54 of the liquid rectifier 53 is set to the water supply 51.
By making the area larger than that of the first liquid outlet 52, the liquid is evenly distributed from the first liquid outlet 52 to the liquid rectifier 53, and then the second liquid outlet 5 having a large area is formed.
Since the fluid is decelerated at 4, the liquid is uniformly supplied into the container 10. This makes the macroscopic velocity distribution in the container 10 uniform. At this time, the nonuniformity of the microscopic velocity distribution is formed between the opening and the non-opening of the liquid rectifier 53.
The liquid flows downward at the second liquid outlet 54,
Since it rises after reversing at the bottom of 0, the mixing distance from the second liquid outlet 54 to the lower end of the module cylinder 14 can be lengthened, and the microscopic velocity distribution can be made more uniform.

As described above, according to the filtering apparatus of this embodiment, the branch flow passage 62 is arranged between the two module rows, and the openings 64 are provided on both sides of the branch flow passage 62. , It becomes possible to have the minimum required structure and equipment,
Compared with the prior art, the facility cost can be significantly reduced, and since the openings 63, 64 are provided within the range directly below the module cylinder 14, the gas ejected from the openings 63, 64 Can be surely allowed to flow into each module tube 14, and the opening areas of the openings 63 and 64 are appropriately adjusted to make the gas flow rate into each module tube 14 uniform. You can Further, by opening the openings 63, 64 horizontally or downward, the impurities such as the clad do not flow into the main flow path 61 or the branch flow path 62 from the openings 63, 64 when the impurities sink by gravity.

Further, according to the filtering apparatus of this embodiment, the area of the second liquid outlet 54 of the liquid rectifier 53 is set to the water supply unit 51.
By making it larger than the area of the first liquid outlet 52, the macroscopic velocity distribution in the container 10 is made uniform, and
Since the liquid flows out downward at the second liquid outlet 54 and then reverses and rises, the mixing distance to the lower end of the module cylinder 14 can be lengthened, and the microscopic velocity distribution can be made more uniform.

(Second Embodiment) Next, a second embodiment of the present invention will be described with reference to FIGS. The feature of this embodiment is that the shapes of the main flow path and the branch flow path forming the air supply mechanism are changed as compared with the first embodiment. In the figure, the first
The same parts as those in the embodiment are designated by the same reference numerals.

FIG. 10 shows the air supply mechanism 160 in this embodiment.
11 shows a part of the cross section taken along the line BB of FIG. 10, respectively. As shown in the figure, the air supply mechanism 160 is composed of a main flow channel 161 and a branch flow channel 162,
The main channel 161 and the branch channel 162 have a channel shape in which the upper surface and both side surfaces are surrounded by flat plates and the lower surface is open. In particular, in this embodiment, the flat plates on both side faces forming the main flow channel 161 and the branch flow channel 162 are slanted, and the open end of the lower portion is narrow and the upper portion is widened to have a channel shape. For this reason, the openings 163 and 164 formed on both side surfaces of the main flow channel 161 and the branch flow channel 162 face downward.

The flat plates on the both side surfaces forming the main flow channel 161 and the branch flow channel 162 may be provided vertically, that is, at right angles to the upper surface. In this case, the openings 163,1
64 is horizontal.

In the above structure, the gas supplied to the main flow channel 161 at the time of cleaning the hollow fiber membrane flows into each branch flow channel 162, and a gas layer is formed in the main flow channel 161 and the branch flow channel 162 to form a gas-liquid mixture. The interface 170 is formed. And the gas-liquid interface 1
Due to the pressure of the liquid acting on 70, gas flows out from the opening 163 of the main flow channel 161 and the opening 164 of the branch flow channel 162 and is evenly supplied into each module cylinder 14.

In this embodiment, the main channel 161 and the branch channel 16
The lower surface of No. 2 is open, and impurities should be exposed in the opening 16 by any chance.
Even if the gas flows in through the module 3 or the opening 164, it falls from the lower surface and is not accumulated inside, but gas is supplied to each module cylinder 14
In order to supply the liquid evenly, it is necessary to raise the heights of the main flow channel 161 and the branch flow channel 162 to some extent to secure the pressure of the liquid acting on the gas-liquid interface 170, and the structure is larger than that of the first embodiment. Equipment cost will be slightly higher.

(Third Embodiment) A third embodiment of the present invention will be described with reference to FIGS. The feature of this embodiment is that an air supply mechanism having an auxiliary flow path is provided at the opening of the branch flow path. In the figure, the same parts as those in the first embodiment are designated by the same reference numerals.

FIG. 12 shows the air supply mechanism 260 in this embodiment.
FIG. 13 shows a part of the cross section taken along line BB of FIG. 12, respectively. In the figure, the air supply mechanism 2
The point 60 is different from the air supply mechanism 60 of the first embodiment is that the auxiliary flow path 266 is provided horizontally (or downward) so as to include the opening 264 of the branch flow path 262. Main flow path 26
1 and its opening 263 are the same as in the first embodiment.

According to the above structure, the gas supplied to the main flow channel 161 at the time of cleaning the hollow fiber membrane flows into each branch flow channel 162, and the opening 163 of the main flow channel 161 and the opening 264 of the branch flow channel 262. Although the gas flows out, as shown in FIG. 14, the gas flowing out from the opening 264 of the branch flow path 262 does not flow into the auxiliary flow path 2
It flows out through 66 and is supplied to each module cylinder 14. In this case, the opening 264 for adjusting the flow rate of the supplied gas may be provided in the auxiliary flow channel 266 instead of the branch flow channel 262.

According to the present embodiment, since the auxiliary flow passage 266 is provided, even if the intervals between the module pipes 14 are wide, each of the module pipes 262 does not need to have a large branch flow passage 262. The gas can be reliably supplied to 14. In addition, an auxiliary flow path may be provided so as to include the opening 263 of the main flow path 261 as necessary.

(Fourth Embodiment) A fourth embodiment of the present invention will be described with reference to FIGS. A feature of the present embodiment is that the air supply mechanism is provided with an auxiliary flow path whose upper end and lower end are opened vertically or inclined so as to include the openings of the main flow path and the branch flow path. In the figure, the same parts as those in the first embodiment are designated by the same reference numerals.

FIG. 15 shows the air supply mechanism 360 in this embodiment.
16 shows part of the cross section taken along the line BB of FIG. 15, respectively. In the figure, the air supply mechanism 3
60 is different from the air supply mechanism 60 of the first embodiment in that the opening 363 of the main flow passage 361 and the opening 364 of the branch flow passage 362 are different.
That is, the auxiliary flow paths 365 and 366 are provided so as to be vertical or inclined.

According to the above structure, the gas supplied to the main flow passage 361 at the time of cleaning the hollow fiber membrane flows into each branch flow passage 362, and the opening 363 of the main flow passage 361, the auxiliary flow passage 365, and the branch flow passage 362. It is supplied to each module cylinder 14 through the opening 364 and the auxiliary flow path 366. Note that the opening 363
And 364 can be provided on either the main flow channel 361 and the branch flow channel 362 side or the auxiliary flow channels 365 and 366 side.

According to this embodiment, the auxiliary channels 365 and 3
Since 66 is provided, the gas can be flown upward from immediately below the module cylinder 14, and each module can be discharged.
The gas can be surely supplied by the barrel 14. In addition, since the lower ends of the auxiliary flow paths 365 and 366 are open, impurities such as clad are removed from the auxiliary flow paths 365 and 36.
It does not accumulate even if it flows into No. 6.

(Fifth Embodiment) A fifth embodiment of the present invention will be described with reference to FIGS. The feature of this embodiment is that the main channel of the air supply mechanism is provided on the inner wall side of the container. In the figure, the same parts as those in the first embodiment are designated by the same reference numerals.

FIG. 17 shows the air supply mechanism 460 in this embodiment.
18 shows a part of the cross section taken along the line BB of FIG. 17, respectively. In the figure, the air supply mechanism 4
The difference of 60 from the air supply mechanism 60 of the first embodiment is that the main flow passage 461 is provided on the inner wall side of the container 11 and the branch flow passage 462 is connected to one side of the main flow passage 461.

According to the above construction, the gas supplied to the main flow passage 461 at the time of cleaning the hollow fiber membrane flows into each branch flow passage 462, passes through each opening 464 of the branch flow passage 462, and reaches each module.
It is supplied to the barrel 14. According to this embodiment, the main flow path 46
1 is provided on the container inner wall 11 side, so that the branch flow path 462
Can be reduced. Other functions and effects are similar to those of the first embodiment.

(Sixth Embodiment) A sixth embodiment of the present invention will be described with reference to FIGS. The feature of the present embodiment is that, compared with the second embodiment, the branch passages of the air supply mechanism are provided for every three rows of module cylinders. In the figure, the second
The same parts as those in the embodiment are designated by the same reference numerals.

FIG. 19 shows an air supply mechanism 560 in this embodiment.
20 shows a part of the cross section taken along the line BB of FIG. 19, respectively. In the figure, a branch channel 56
Similar to the case of the second embodiment, 2 has a channel shape in which the upper surface and both side surfaces are surrounded by flat plates and the lower surface is open. Particularly, in the present embodiment, flat plates on both side surfaces forming the branch channel 562 are provided. Is slanted, the open end of the lower part is narrow, and the upper part is wide. The difference from the second embodiment is that the main channel 561 is the same as in the fifth embodiment.
Is provided on the side of the container 11 and branch passages 562 are provided for each of the three rows of the module tubes 14, and the opening portions 564 are included in the module tubes 14 on both sides of the branch channel 562. To
That is, the auxiliary flow path 566 is provided to extend immediately below the module cylinder 14.

According to the above construction, the gas supplied to the main flow passage 561 at the time of cleaning the hollow fiber membrane flows into each branch flow passage 562, and to the module cylinder 14 immediately above the branch flow passage 562. Through the opening 564 on the upper surface of the branch channel 562, the branch channel 5
Openings 564 are provided for the module cylinders 14 on both sides of 62.
And is supplied to each module cylinder 14 through the auxiliary flow path 566.

According to this embodiment, since the lower surface of the branch flow path 562 is open, even if impurities should flow in from the opening 564, they will fall from the lower surface and will not be accumulated inside, so the branch flow path 562 will be accumulated. An opening 564 can also be provided on the upper surface of the branch flow passage 562, so that the air can be supplied from one branch flow passage 562 to the module cylinders 14 in a larger number of rows. It becomes possible to do.

[0053]

As described above, according to the present invention, the following effects can be expected.

Since one branch flow path is provided for each adjacent two or three filtration module rows, the number of branch flow paths is reduced to 1/2 or less or 1/3 or less as compared with the prior art. It is possible to reduce the cost, and it is possible to significantly reduce the equipment cost.

The positions of the openings of the main channel and the branch channels, and the tip positions of the auxiliary channels extended from the openings are
Since it corresponds to the lower open end of the filtration module, the gas ejected from the opening can surely flow into the filtration module, and the hollow fiber membrane in the filtration module can be effectively washed. Becomes

The flow passage area of the main flow passage, the flow passage area of the branch flow passage,
By appropriately setting the area of the opening provided in the branch flow path, it is possible to make the flow rate of gas supplied into each filtration module uniform.

The main channel and the branch channel are provided with an opening in the same manner as the branch channel so as to supply air to the filtration module close to the main channel, so that the main channel and the branch channel can be arranged more efficiently. can do.

By making the openings of the main flow path and the branch flow path or the auxiliary flow path horizontal or downward, impurities such as clad that gravity-falls in the liquid to be purified will flow from the opening or the auxiliary flow path tip to the main flow path or the auxiliary flow path. It can be prevented from flowing into the inside of the branch flow path.

[Brief description of drawings]

FIG. 1 is an overall structural view of a filtering device according to a first embodiment of the present invention.

FIG. 2 is a detailed structural diagram of an air supply mechanism according to the first embodiment of the present invention.

3 is a diagram showing a part of a cross section taken along line BB of FIG. 2. FIG.

FIG. 4 is a diagram showing a state of gas supplied to a filtration module in the air supply mechanism according to the first embodiment.

FIG. 5 is a plan view of a support fitting for supporting the main channel on the inner wall of the container.

FIG. 6 is a side view of the support fitting shown in FIG.

FIG. 7 is a structural diagram of a connecting portion for connecting the main flow path to a device outside the container.

FIG. 8 is a structural diagram of a water supply mechanism.

9 is a cross-sectional view taken along the line CC of FIG.

FIG. 10 is a detailed structural diagram of an air supply mechanism according to a second embodiment of the present invention.

11 is a diagram showing a part of a cross section taken along line BB of FIG.

FIG. 12 is a detailed structural diagram of an air supply mechanism according to a third embodiment of the present invention.

13 is a diagram showing a part of a cross section taken along the line BB of FIG.

FIG. 14 is a view showing a state of gas supplied to the filtration module in the air supply mechanism according to the third embodiment.

FIG. 15 is a detailed structural diagram of an air supply mechanism according to a fourth embodiment of the present invention.

16 is a diagram showing a part of a cross section taken along line BB of FIG.

FIG. 17 is a detailed structural diagram of an air supply mechanism according to a fifth embodiment of the present invention.

FIG. 18 is a diagram showing a part of a cross section taken along line BB of FIG. 17.

FIG. 19 is a detailed structural diagram of an air supply mechanism according to a sixth embodiment of the present invention.

20 is a diagram showing a part of a cross section taken along line BB of FIG.

[Explanation of Codes] 10 Container 11 Filtration Module 13 Hollow Fiber Membrane 14 Module Cylinder 15 Water Supply Pipe 16 Air Supply Pipe 50 Water Supply Mechanism 51 Water Supply Device 52 First Liquid Outlet 53 Liquid Rectifier 54 Second Liquid Outlet 60 Supply Air mechanism 61 Main flow path 62 Branch flow path 63 Opening 64 Opening 67 Support metal fittings 68 Support rod 160 Air supply mechanism 161 Main flow path 162 Branch flow path 163 Opening 164 Opening 260 Air supply mechanism 261 Main flow path 262 Branch flow path 263 Opening 264 Opening 266 Auxiliary flow path 360 Air supply mechanism 361 Main flow path 362 Branch flow path 363 Opening part 364 Opening part 365 Auxiliary flow path 366 Auxiliary flow path 460 Air supply mechanism 461 Main flow path 462 Branch flow path 464 Opening part 560 Supply Air mechanism 561 Main flow path 362 Branch flow path 564 Opening 566 Auxiliary flow path

Claims (10)

[Claims] 1. A container, a plurality of cylindrical filtration modules arranged in a zigzag lattice or a square lattice in the container, and water supply means for supplying a liquid to be purified into the container, In the filtration device for purifying the liquid to be purified by passing the liquid to be purified supplied into the container through the tubular filtration module, the cylindrical filtration modules are arranged and formed. Of the filtration module rows, one branch channel is prepared for two adjacent filtration module rows, and the branch channel is provided between the two adjacent filtration module rows and The tubular filtration modules are arranged below the filtration module row, and
An opening is formed on the side surface of the branch flow path corresponding to the lower open end of the container, and the branch flow path is connected to the main flow path leading to the outside of the container, and is supplied from the outside of the container into the main flow path. It is possible to wash the tubular filtration module by ejecting the gas through the opening of the branch channel and introducing the ejected gas into the tubular filtration module from the lower open end. Characteristic filtering device. 2. The filtering device according to claim 1, wherein an opening for ejecting gas is formed in the main flow path at a position corresponding to a lower open end of the tubular filtration module. Characteristic filtering device. 3. The filtering device according to claim 1, wherein the opening is formed horizontally or downward. 4. The filtering device according to claim 1, wherein the main flow path and the branch flow path are formed by piping or a channel member whose upper surface and both side surfaces are surrounded by flat plates and whose lower surface is open. Filtering device. 5. The filtering device according to claim 1, wherein the auxiliary flow path having a flow passage cross-sectional area larger than the opening area of the opening and one end connected to the opening is provided horizontally or downward. The filtration device is characterized in that the other end of the auxiliary flow path is arranged substantially directly below the lower open end of each of the tubular filtration modules. 6. The filtering device according to claim 5, wherein the auxiliary flow path is constituted by a pipe or a channel member whose upper surface and both side surfaces are surrounded by a flat plate and whose lower surface is open. 7. The filtering device according to claim 1, wherein the auxiliary flow path having a flow passage cross-sectional area larger than an opening area of the opening and a side surface connected to the opening is provided vertically or inclined. At the same time, the upper end of the auxiliary flow path is arranged substantially directly below the lower open end of each of the tubular filtration modules. 8. The filtering device according to claim 7, wherein the auxiliary flow path is constituted by a pipe whose upper and lower ends are open. 9. A container, a plurality of tubular filtration modules arranged in a zigzag lattice or a square lattice in the container, and water supply means for supplying the liquid to be purified into the container, In the filtration device for purifying the liquid to be purified by passing the liquid to be purified supplied into the container through the tubular filtration module, the cylindrical filtration modules are arranged and formed. Of the three filtration module rows adjacent to each other, one channel member having an upper surface and both side surfaces surrounded by a flat plate and an open lower surface is prepared for adjacent three filtration module rows, and the channel members are adjacent to each other. Of the three filtration module rows, the tubular filtration modules are arranged directly below the central filtration module row, and on the upper surface of the channel member, the lower portion of each tubular filtration module forming the central filtration module row is opened. Form an opening corresponding to the edge Openings are formed on both side surfaces of the channel member so as to correspond to the lower open ends of the tubular filtration modules forming the filtration module rows on both sides, and the main flow path leading to the outside of the container is formed. By connecting a channel member, the gas supplied from the outside of the container into the main flow path is ejected from the openings of the upper surface and both side surfaces of the channel member, and the ejected gas is introduced into the tubular filtration module. A filtration device characterized in that the tubular filtration module is washed by introducing it from the lower open end. 10. The filtration device according to claim 1 or 9, wherein a hollow fiber membrane is housed inside the tubular filtration module.