JP5399384B2 - Filter element, filter module and filtration device - Google Patents

Description

  The present invention relates to a filter module that not only reduces filter clogging and reduces the frequency of filter replacement in the filtration of various fluids, but also facilitates replacement work, and a filtration device that enables effective filtration operation. .

  Conventionally, in the fluid filtration process, as shown in FIG. 1, a filtration process is performed in advance with a coarse strainer 1, and a filtration process is performed again with a finer filter 2. This is because if the fluid is directly filtered with a fine filter, even larger foreign matters than necessary are captured on the filter surface, and the filter is clogged early.

  As an embodiment of the strainer, it is known to install a sock-shaped or skirt-shaped filter cloth so as to cover the outer peripheral portion of the filtration membrane (see, for example, Patent Document 1). The above filter cloth is fixed at least to the upper end of the filter membrane element, covers at least the outer peripheral side surface of the filter membrane, can prevent large foreign matter from entering the filter membrane surface, and when the filter membrane is backwashed In addition, the filter cloth itself can be washed.

JP 2007-038172 A

  In the prior art, the strainer 1 and the filter 2 are housed in independent housings 3 and 4, respectively, and piping for connecting them is required, and a large installation space is required.

  Further, when clogging occurs, replacement and cleaning of the strainer 1 and the filter 2 are required, and much labor is required for the work.

  In addition, when the filter cloth described in Patent Document 1 is used for a filtration process with a large flow rate of raw water, the filter cloth may stick to the filtration membrane and be integrated, or the filtration membrane may be clogged and filtered. There was no noticeable improvement in the degree of backwashing of the membrane and filter cloth, and further improvement in performance was desired.

  Accordingly, an object of the present invention is to provide a new filter element and element module that solves these problems with a simple structure, and a filtration device using the same.

  The above problems are solved by the present invention described below. That is, in the present invention, the cylindrical filter 5 having a hole with a hole diameter of 100 μm or less and having a radius r fixed at both ends and the outer periphery of the cylindrical filter 5 covers the periphery of the cylindrical filter 5 and is not fixed. It relates to a filter element 7 having a cylindrical strainer 6 having a radius R of not less than 300 μm and arranged in this manner.

  Further, the present invention is preferably a filter element 7 in which two or more cylindrical filters are arranged, and the distance between the centers of the cylindrical filters 5 is larger than 2R, smaller than 2 × (2R−r), etc. The filter elements 7 are arranged at intervals.

  The present invention also relates to the above filter element in which the gap between the element plate 8 for fixing the cylindrical filter 5 of the filter element 7 and both ends of the cylindrical strainer 6 is equal to or smaller than the hole diameter of the cylindrical strainer 6.

  In the filter module having the housing 14 configured by inserting the filter element 7, the long axis direction of the cylindrical filter 5 is inclined with respect to the horizontal plane in the range of 20 ° to 70 °. It relates to the filter module.

  Furthermore, the present invention relates to a filter device having the above-described filter module and means for changing the filtration flow rate or the flow direction of the target fluid when the target fluid is filtered.

According to the present invention, it is possible to provide a filter module and a filtration device that have a simple structure, have a small installation space, can perform fluid filtration for a long period of time, and can easily replace strainers and filters.

  Hereinafter, actual embodiments of the present invention will be described with reference to the drawings.

  FIG. 2 is a schematic perspective view showing an example of the filter element according to the present invention and a cross-sectional view in the horizontal direction.

  The cylindrical filter of the present invention can be appropriately selected as long as it has a hole with a hole diameter of 100 μm or less and has a cylindrical shape with a radius r. Examples of the material include various synthetic resins, for example, polyolefins such as polyethylene and polypropylene, polyesters, polyamides, celluloses, and metals, but polyolefins are preferable in view of the balance between lightness and rigidity. In the present invention, the pore diameter refers to the nominal pore diameter.

  If the cylindrical strainer of this invention has a hole with a hole diameter of 300 micrometers or more and is a cylindrical shape of the radius R, a suitable thing can be selected suitably. Examples of the material include various synthetic resins, for example, polyolefins such as polyethylene and polypropylene, metals such as polyester, polyamide, and cellulose, but rigidity capable of maintaining a cylindrical shape even when the flow rate of raw water is large. In view of the fact that it is necessary to have the light weight necessary for the strainer itself to move, synthetic resins, particularly polyolefins, are suitable. In addition, the cylindrical strainer is installed on the outer periphery of the cylindrical filter so as to cover the periphery of the cylindrical filter, and further needs to be arranged so as not to be fixed, so that R> r between R and r. There is a relationship.

  In FIG. 2, the cylindrical filter 5 is fixed to the upper and lower element plates 8, but the cylindrical strainer 6 is mounted without being fixed to the outer peripheral portion of the cylindrical filter. The gap between the element plate 8 that fixes the cylindrical filter 5 of the filter element 7 and both ends of the cylindrical strainer 6 is preferably equal to or smaller than the hole diameter of the cylindrical strainer 6. As shown in the sectional view of FIG. 2, the cylindrical strainer 6 having the above-described configuration can freely move in a circle having a radius of 2R-r from the center of the element as well as rotating. Although the cylindrical strainer used in the present invention is restricted in movement by the cylindrical filter, the cylindrical strainer and the cylindrical filter are in contact with each other only at a very small part of the surface area of the cylindrical strainer. The strainer and the cylindrical filter are prevented from sticking to each other. By adopting such a filter element configuration including a cylindrical strainer and a cylindrical filter, the cylindrical strainer can move within a circle having a radius of 2R-r by the flow of the fluid to be filtered. As the cylindrical strainer moves in this manner, it collides with the wall surface of the housing that exists between the cylindrical strainer and the cylindrical filter and between the cylindrical strainer and the outer periphery of the cylindrical strainer, and peels off large foreign matter adhering to the cylindrical strainer. It becomes possible. As a result, the filter element of the present invention has an excellent effect of not only reducing clogging of the strainer and reducing the replacement frequency of the filter but also facilitating the replacement work.

  FIG. 3 is a schematic perspective view and a horizontal sectional view showing an example of a filter element in which two or more cylindrical filters 5 are arranged in the filter element 7 according to the present invention.

  Although FIG. 3 shows an example in which three filter elements are arranged, the case where more filter elements are arranged also applies to this.

  Assuming that the distance between the centers of adjacent cylindrical filters is L, it is desirable to set L to 2R <L <2 × (2R−r). By maintaining this distance, it becomes possible for the strainer to freely move around the fixed filter. In addition to the above-mentioned effects, the adjacent strainers collide with each other to peel off foreign matter adhering to the strainer surface. An effect is also born.

  FIG. 4 is a schematic perspective view showing an example of the filter module according to the present invention.

  In FIG. 4, the housing 14 is provided with a pressure-resistant hatch 9 for opening and closing, and four nozzles: a fluid inlet 10, a fluid outlet 11, an air vent 12, and a drain 13.

  The housing 14 can also be installed on the floor surface by the support 15 with an inclination, and it is preferable that the long axis direction of the cylindrical filter is preferably inclined at a range of 20 ° to 70 ° with respect to the horizontal plane. . By adopting such a configuration, it is possible to realize installation in places where the height is restricted, and it is easy to replace the filter element.

  In order to obtain the maximum effect of the present invention, it is important to appropriately move the cylindrical strainer, and this can be achieved by using means for changing the flow rate and direction of the target fluid to be filtered.

  As the means described above, the pump power supply of the filtration device may be periodically turned ON / OFF, but the flow rate of the target fluid may be periodically changed by using an inverter. Further, by performing backflow cleaning, the replacement life of the cylindrical strainer or the cylindrical filter can be more effectively extended.

  FIG. 5 is a flowchart showing an example of the filtration device according to the present invention.

  FIG. 5 is an example of a flowchart of an apparatus in which two filter modules are arranged in parallel. The pump 16, the filter modules 18, 19 and the automatic opening / closing valves 20 to 27 are arranged as shown in the figure.

  Table 1 is a process chart showing an example of an operation process of the filtration device according to FIG.

  The black circles in the table indicate that the pump is ON or the automatic open / close valve is open, and that no mark indicates that the pump is OFF or the automatic open / close valve is closed.

  When the backwashing is performed, the filter is filtered by one filter module 18 without stopping the pump, and the filtered fluid is introduced into the filtration side of the other filter module 19 to cause a backflow on the filtration surface. The foreign matter adhering to the surface can be effectively peeled off and discharged.

  FIG. 6 is a flowchart showing another example of the filtration device according to the present invention. FIG. 6 is an example of a flowchart of an apparatus in which compressed air or nitrogen gas is introduced into the filter module and backwashing is performed from the filtration side. The pump 16, the filter module 17, and the automatic opening / closing valves 28 to 33 are arranged as shown in the figure.

  Table 2 is a process chart showing an example of an operation process of the filtration device according to FIG. The black circles in the table indicate that the pump is ON or the automatic open / close valve is open, and that no mark indicates that the pump is OFF or the automatic open / close valve is closed.

  In backwashing with compressed air or nitrogen gas, the pump 16 is stopped and compressed air or nitrogen gas is sent to the filtration side of the filter module 17 to effectively separate and discharge foreign matter adhering to the filter filtration surface, and the strainer moves such as vibration. By doing this, foreign matter on the strainer surface can also be efficiently peeled off and discharged.

  The present invention is useful in various fluid filtration treatments. For example, if it is used as a pretreatment for microfiltration of hollow fiber membranes or RO membranes, the installation space can be omitted, and the downstream side of the product of the present invention. Can reduce the burden on the processing.

  For example, if it is used in the circulation filtration of a pool or a bathtub, an occupied space in a machine room or the like can be greatly reduced as an alternative to a hair collector and a sand filter.

  Also, for example, if used as a ship ballast water filtration device, the installation space is small and microorganisms in the ballast water can be removed in advance, reducing the filling amount of drugs and inert gas when sterilizing and sterilizing in the ballast tank can do.

It is the conceptual diagram which showed an example of the conventional general fluid filtration processing method. It is the schematic perspective view which shows an example of the filter element which concerns on this invention, and sectional drawing of a horizontal direction. FIG. 4 is a schematic perspective view and a horizontal sectional view showing an example of a filter element in which a plurality of filter elements are arranged in the filter element according to the present invention. It is a schematic perspective view which shows an example of the filter module which concerns on this invention. It is a flowchart figure which shows an example of the filtration apparatus which concerns on this invention. It is a flowchart figure which shows an example of the filtration apparatus which concerns on this invention.

1: Strainer 2: Filter 3: Strainer housing 4: Filter housing 5: Cylindrical filter 6: Cylindrical strainer 7: Filter element 8: Element plate 9: Pressure hatch 10: Fluid inlet nozzle 11: Fluid outlet nozzle 12: Air vent Nozzle 13: Drain nozzle 14: Housing 15: Support 16: Pump 17: Filter module 18: Filter module 1
19: Filter module 2
20: Automatic on-off valve V1
21: Automatic on-off valve V2
22: Automatic open / close valve V3
23: Automatic on-off valve V4
24: Automatic open / close valve V5
25: Automatic open / close valve V6
26: Automatic on-off valve V7
27: Automatic on-off valve V8
28: Automatic on-off valve V9
29: Automatic on-off valve V10
30: Automatic on-off valve V11
31: Automatic on-off valve V12
32: Automatic open / close valve V13
33: Automatic on-off valve V14

Claims (3)

A cylindrical filter having a hole diameter of 100 μm or less and having a radius r fixed at both ends, and the outer periphery of the cylindrical filter covers the periphery of the cylindrical filter, and is not fixed to the outer periphery of the cylindrical filter. A filter element having a cylindrical strainer having a radius R of a pore diameter of 300 μm or more arranged as follows:
In the filter module having a housing configured by inserting a filter element in which the gap between the element plate for fixing the cylindrical filter of the filter element and the both ends of the cylindrical strainer is equal to or less than the hole diameter of the cylindrical strainer ,
A filter module in which a long axis direction of a cylindrical filter is tilted in a range of 20 ° to 70 ° with respect to a horizontal plane . The filter element is a filter element in which two or more cylindrical filters are arranged and fixed to the same element plate, and the distance between the centers of the cylindrical filters is larger than 2R, 2 × (2R−r) smaller filter module according to claim 1 is a flow I Luther elements ing are arranged at equal intervals. A filter device comprising: the filter module according to claim 1 or 2; and means for changing a filtration flow rate or a flow direction of the target fluid when the target fluid is filtered.

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