JP4527232B2 - Rack type filter - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a rack type filtration apparatus using a hollow fiber membrane. More specifically, the present invention relates to a rack-type filtration device that removes and sterilizes a large amount of raw water such as river water, lake water, groundwater, seawater, domestic wastewater, or factory wastewater.
[0002]
[Prior art]
In the conventional rack-type filtration device, the hollow fiber membrane module has the module housing and the hollow fiber membrane bonded and fixed with an adhesive, and when the module reaches the end of its life, the entire module is discarded. Also, depending on the usage conditions of the module, it may be required to have high corrosion resistance, chemical resistance, and high pressure resistance, and it is necessary to use an expensive housing, which is economically expensive and increases waste. Environmental problems also arise. Therefore, a cartridge type module that can divide the module housing and the hollow fiber membrane has been proposed, and it has become possible to reuse the housing and discard only the hollow fiber membrane cartridge. The conventional rack type hollow fiber membrane cartridge type module is based on the premise of an all-filtration operation type, and therefore there is a problem that a stable operation cannot be performed when a cross-flow filtration operation is performed.
[0003]
[Problems to be solved by the invention]
The present invention provides a rack-type filtration device having an inexpensive rack-type module housing that can stably perform the cross-flow filtration operation that has been difficult with the rack-type hollow fiber membrane cartridge type module as described above. In particular, it is an object of the present invention to provide a rack type filtration apparatus provided with a rack type module housing that is useful when a metal material that can be expected to have corrosion resistance, weather resistance and strength is used as a constituent material.
[0004]
[Means for Solving the Problems]
To achieve the above object, the present invention is as follows.
(1) In the rack type filtration apparatus a plurality of cartridges type module of hollow fiber membrane was bonded fixed is supported by being inserted into the rack type housing, circulating water passage which communicates with the housing body of the rack-type housing, the outer panel A rack-type filtration device characterized in that it is liquid-tightly provided in a headband shape on the outer periphery of the housing body by welding and joining the housing to the housing body.
[0005]
(2) The housing body is formed with a plurality of communication holes in the radial direction, and the circulating water flowing through the plurality of communication holes is collected in the circulating water flow path and flows out from the circulating water port. (1) The rack type filtration device according to (1).
[0006]
(3) The rack type filtration device according to (1) or (2), characterized in that the cross-sectional area of the circulating water passage is configured to increase toward the circulating water port.
(4) The rack type filtration device according to (1), (2) or (3), wherein the communication hole has a slit shape having a major axis in the longitudinal direction of the housing body.
(5) The rack type filtration device according to (1), wherein the circulating water flow path is formed by welding and joining a two-part casting.
(6) A rack-type housing is manufactured by casting a cylindrical housing body having a plurality of communication holes and a cylindrical outer plate having a larger diameter than the cylindrical housing body, and then casting two castings by circumferential welding. The rack type filtration device according to (1), wherein the rack type filtration device is manufactured by liquid-tight welding.
(7) A rack type characterized in that the circulating water flow path communicating with the housing main body of the rack type housing is liquid-tightly provided in a headband shape on the outer periphery of the housing main body by welding the outer plate to the housing main body. housing.
[0007]
The rack-type filtration apparatus according to the present invention is a rack-type filtration apparatus in which a cartridge-type module in which a plurality of hollow fiber membranes are bonded and fixed is inserted and supported in a rack-type housing. A water flow path is provided in a liquid-tight manner in a headband shape on the outer periphery of the rack-type housing body.
According to the above-described structure, the circulating water flow path is provided in a bowl-like liquid-tight manner on the outer periphery of the rack-type housing main body, so that it is easy to ensure the flow rate at the circulating water outlet at a certain level or more.
In addition, a plurality of communication holes in the radial direction are formed in the rack-type housing body, and the circulation is made by circulating the plurality of communication holes in a circulating water flow path that is liquid-tightly provided on the outer periphery of the rack-type housing body. It is desirable that the water is collected and flows out from the circulating water port of the circulating water channel.
[0008]
In addition, when the cross-sectional area of the circulation channel provided in a bowl-like liquid-tight manner on the outer periphery of the rack-type housing body is increased toward the circulation water port of the circulation channel, the circulation water channel The flow resistance of the circulating water that increases as it becomes downstream toward the circulating water port can be reduced, and the flow rate of the circulating water port can be kept constant.
Further, when the plurality of communication holes provided in the radial direction in the rack type housing body are formed in a slit shape having a long diameter in the longitudinal direction of the housing, it corresponds to an exchange cartridge for an adhesive layer having an arbitrary length. Can be installed in the housing.
In addition, when a double pipe structure portion provided in a bowl shape on the outer periphery of the rack type housing body is manufactured by two-piece casting and then welded and manufactured, an inexpensive rack type housing may be manufactured. I can do it.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of a rack-type filtration device according to the present invention will be specifically described with reference to the drawings. FIG. 1 is an explanatory cross-sectional view showing a configuration of a rack type filtration apparatus according to the present invention, and FIG. 2 is an enlarged view of a main part showing a configuration of a connecting portion when a cartridge type module is inserted.
Hereinafter, an embodiment of a so-called cross-flow filtration type rack type filtration apparatus that performs filtration while circulating a stock solution as a rack type filtration apparatus according to the present invention will be described with reference to FIGS. 1 and 2.
[0010]
In FIG. 1, reference numeral 1 denotes a so-called cross-flow filtration type rack type filtration device that performs filtration while circulating a stock solution. For example, river water, lake water, groundwater, seawater, domestic wastewater, or factory wastewater. Etc. can be applied to water treatment for purifying by microfiltration using ultrafiltration or ultrafiltration equipment.
A cartridge-type module 3 in which a plurality of hollow fiber membranes are bonded and fixed is inserted and supported in a rack-type housing 2 of the rack-type filtration device 1.
[0011]
The rack-type housing 2 includes a housing main body 4 that is arranged on the upper and lower parts and is erected by support means (not shown), a cap 5 and a nut 6 that are attached to the upper part of the housing.
In the cartridge type module 3, the flange portion 7 a of the cartridge head 7 is sandwiched between the housing head 8 and the cap 5 and fixed by the nut 6. By tightening the nut 9a with the packing 9 between the flange 7a of the cartridge head and the housing head 8 and the O-ring 10 between the flange 7a and the cap 5, the cartridge-type module 3 is It is liquid-tightly attached to the rack-type housing 2.
[0012]
Further, as shown in FIG. 3 and FIG. 4, an outer plate 13 having a U-shaped longitudinal section that forms a circulating water flow path 12 communicating with the inside of the housing body 4 on the outer periphery of the housing body 4 at the side of the circulating water port 11. Headband-like liquid-tight. A plurality of communication holes 14 are formed in the wall surface of the housing body 4 in the radial direction of the housing body so as to communicate the inside of the housing body and the circulating water flow path 12. Circulating water that has circulated through the plurality of communication holes 13 from the inside of the housing body is collected in the circulating water channel 12 formed by the plate 13 and flows out from the circulating water port 11 of the circulating water channel 12.
[0013]
As shown in FIG. 4, the longitudinal cross-sectional area of the circulating water passage 12 provided in a bowl-like liquid-tight manner on the outer periphery of the housing body 4 is configured to increase toward the circulating water port 11 of the circulating water passage 12. Thus, the flow resistance of the circulating water that increases as it goes downstream toward the circulating water port 11 of the circulating water flow path 12 can be reduced.
In addition, in this embodiment, although an example when the longitudinal cross-sectional shape of the circulating water flow path 12 is formed in a square shape is demonstrated, a cross-sectional semicircle shape, a cross-sectional C-shape, etc. as other structures of the circulating water flow path 12, It can be formed in various shapes.
[0014]
Further, in this embodiment, the circulating water flow path 12 is disposed in a headband shape substantially horizontally on the outer periphery of the housing body 4, but may be disposed with a predetermined inclination as necessary.
Further, the number, the diameter shape, and the diameter area of the communication holes 14 communicating the circulating water flow path 12 and the inside of the housing body 4 can be set to various numbers, the diameter shapes, and the diameter areas.
In particular, when the shape of the communication hole 14 is a slit shape having a long axis with respect to the axial direction of the housing body 4, various cartridge type modules 3 having different thicknesses of the adhesive layer 17 can be mounted.
[0015]
The cap 5 is fixed in a water-tight and liquid-tight manner to the cartridge head 7 via the O-ring 10, and a treated water chamber 15 is formed by a space formed by the cap 5 and the cartridge head 7.
The materials of the housing body 4 and the cap 5 and nut 6 used in the present invention are not particularly limited and may be the same or different, but stainless steel is preferably used in terms of corrosion resistance, weather resistance and strength reliability. It is done.
[0016]
On the other hand, the hollow fiber has an upper end opened and a lower end closed, and as shown in FIG. 2, a plurality of hollow fiber membranes 16 are bundled and the outer periphery of the upper end is bonded by an adhesive. The adhesive layer 17 is integrally bonded, and the adhesive layer is fitted into the cylindrical cartridge head 7 and fixed to the cartridge head with an adhesive.
In addition, a cartridge cylinder 18 fitted to the outer periphery of the hollow fiber membrane 16 that is integrally bundled is fixed to the lower end portion of the cartridge type module 3 by welding or adhesion.
[0017]
The pore diameter of the hollow fiber membrane used in the present invention is not particularly limited, and a hollow fiber membrane having a pore diameter in the range of an ultrafiltration membrane or a microfiltration membrane is preferably used. Moreover, the material of the hollow fiber membrane is not particularly limited, and a membrane of a synthetic polymer, ceramic, or a composite material thereof can be used.
The adhesive used in the cartridge type module of the present invention is not particularly limited, and an epoxy resin, a urethane resin, a silicon resin, or the like can be used. The material of the cartridge head, cartridge cylinder and skirt may be the same or different, and is not particularly limited, and is selected from moldability, pressure resistance, chemical resistance and economy. Preferred materials include thermoplastic resins such as polyvinyl chloride, polyethylene, polypropylene, polyamide, ABS resin, AS resin, PVDF, and stainless steel having high mechanical strength.
[0018]
As shown in FIG. 1, the length from the upper end of the cartridge type module 3 to the lower end of the cartridge cylinder 18 connected to the cartridge head is set to be longer than the total length of the hollow fiber membrane, The raw water or air bubbling air supplied from the supply water chamber 21 is efficiently guided to the hollow fiber membrane 16 of each cartridge type module 3 by the skirt 18a of the cartridge cylinder extending further downward than the lower end of the cartridge 16. Yes.
In the above configuration, during the filtration operation by the rack type filtration device 1, the raw water supplied to the supply water chamber 21 from the raw water port 22 provided in the lower part of the housing body 4 by a pump (not shown) is supplied to the skirt portion 18 a of the cartridge type module 3. Led.
[0019]
A portion of the raw water that has passed through the outer periphery of the hollow fiber membrane 16 of the cartridge type module 3 is pressure filtered from the outer surface of the hollow fiber membrane 16 to the hollow portion, and treated from the open upper end of the hollow fiber membrane. The filtrate is led to the water chamber 15, and a part thereof passes through the outer periphery of the hollow fiber membrane 16 as it is.
The filtrate contained in the treated water chamber 15 is taken out of the rack type filtration device 1 from the treated water port 23 at the upper part of the cap, and the raw water that has passed through the outer periphery of the hollow fiber membrane 16 is directly applied to the side wall portion of the housing body 4. Water is collected from the plurality of communication holes 14 formed at a predetermined pitch in the circumferential direction through the head-circulated circulating water flow path 12 and is led from the circulating water port 11 on the downstream side to the outside of the rack filtration device 1.
[0020]
In this way, a portion of the supplied water is circulated through the circulating water flow path 12 provided in a bowl shape on the outer periphery of the housing body 4 to collect water, thereby maintaining a high membrane surface flow rate and stably increasing the water permeability. The maintained cross flow filtration operation becomes possible.
On the other hand, at the time of backwashing, for example, filtered water is supplied from the treated water port 23 and backflowed to the circulating water flow path 12 and the supply water chamber 21, and suspended substances accumulated in the hollow fiber membrane 16 are stripped off. To eliminate.
[0021]
According to the above configuration, the circulating water flow path 12 communicating with the inside of the housing body 4 is liquid-tightly provided on the outer periphery of the housing body 4 in a bowl-like shape, so that the flow rate of the circulating water outlet 11 can be secured above a certain level. Easy to do.
Further, when the plurality of communication holes 14 provided in the radial direction in the rack type housing body 4 are formed in a slit shape having a long diameter in the longitudinal direction of the housing, the cartridge type module of the adhesive layer 17 having an arbitrary length is used. 3 can be mounted in the housing 2 correspondingly.
[0022]
Further, when considering applying a metal material to the housing 2 as means for improving corrosion resistance, weather resistance and strength, the housing head 8 and the outer plate 13 provided in a headband shape on the outer periphery of the housing body 4 are considered. If the heavy pipe structure is divided into a plurality of parts and each part is manufactured by cutting, the cost will be very high. In addition, it is difficult to manufacture the double pipe portion as a single body by casting and molding.
As shown in FIG. 5, the double pipe portion is divided into two parts, a housing body 4 having a communication hole 14 in the upper portion and an outer plate 13 portion, and each is manufactured by casting or molding and then welded. Thus, it is possible to manufacture a housing body that is relatively inexpensive and has a high dimensional system.
[0023]
In this case, the housing body 4 may be prepared as a single casting if the overall length is short. When the housing body 4 is long, the housing body is divided into three parts, a head part, a body part, and a raw water port part 22, and the head part and the raw water port part are made of cast metal, and then the body part of a commercial pipe is used. The housing body 4 may be manufactured by welding.
[0024]
【The invention's effect】
In the present invention, the circulating water flow path communicating with the inside of the housing body is provided in a liquid-tight manner like a headband on the outer periphery of the rack-type housing body, so that the flow rate of the circulating water port can be easily secured above a certain level.
In addition, when the cross-sectional area of the circulation channel provided in a bowl-like liquid-tight manner on the outer periphery of the rack-type housing body is increased toward the circulation water port of the circulation channel, the circulation water channel The flow resistance of the circulating water that increases as it goes downstream toward the circulating water port can be reduced, and the flow rate of the circulating water port can be kept constant.
[0025]
Further, when a plurality of communication holes provided in the radial direction in the rack type housing main body are formed in a slit shape in the longitudinal direction of the housing, the inside of the housing corresponds to the cartridge type module of the adhesive layer having an arbitrary length. Can be attached to.
In addition, when a double pipe structure portion provided in a bowl shape on the outer periphery of the rack type housing body is manufactured by two-piece casting and then welded and manufactured, an inexpensive rack type housing may be manufactured. I can do it.
[Brief description of the drawings]
FIG. 1 is a cross-sectional explanatory view showing a configuration of a rack type filtration apparatus according to the present invention.
FIG. 2 is an enlarged view of a main part showing a configuration of a connecting portion when a cartridge type module is inserted into a rack type housing.
FIG. 3 is a perspective view showing a configuration of a circulating water flow path provided in a headband shape on the outer periphery of the housing body.
FIG. 4 is an explanatory plan view showing a configuration of a circulating water flow path provided in a headband shape on the outer periphery of the housing body.
FIG. 5 is a perspective view of each part when the double pipe structure part of the circulating water flow path is made of a two-part casting, wherein (a) is an outer plate part, and (b) is a housing body part. It is a perspective view shown.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Rack type filtration apparatus 2 ... Rack type housing 3 ... Cartridge type module 4 ... Housing main body 5 ... Cap 6 ... Nut
6a ... Screw part 7 ... Cartridge head
7a ... brim 8 ... housing head 9 ... packing
10 ... O-ring
11 ... Circulating water outlet
12 ... Circulating water flow path
13… Shell
14 ... Communication hole
15 ... treated water chamber
16 ... Hollow fiber membrane
17… Adhesive layer
18 ... cartridge cylinder
18a ... Skirt
19… Adhesive layer
20 ... through hole
21 ... Supply water chamber
22 ... Haramizuguchi
23 ... treated water outlet

Claims (7)

  In a rack type filtration device in which a cartridge type module in which a plurality of hollow fiber membranes are bonded and fixed is inserted and supported in a rack type housing, a circulating water flow path communicating with the housing main body of the rack type housing has an outer plate as a housing main body. A rack-type filtration device characterized in that it is liquid-tightly provided in a bowl-like shape on the outer periphery of the housing body by being welded to the housing.   A plurality of communication holes are formed in the housing body in a radial direction, and the circulating water that has circulated through the plurality of communication holes is collected in the circulating water flow path and flows out from the circulation water port. The rack type filtration apparatus according to claim 1.   The rack-type filtration device according to claim 1 or 2, wherein a cross-sectional area of the circulating water channel is configured to increase toward the circulating water port.   The rack-type filtration device according to claim 1, 2 or 3, wherein the communication hole has a slit shape having a major axis in the longitudinal direction of the housing body.   The rack-type filtration device according to claim 1, wherein the circulating water flow path is formed by welding and joining a two-part casting.   A rack-type housing is manufactured by casting a cylindrical housing body having a plurality of communication holes and a cylindrical outer plate having a larger diameter than the cylindrical housing body, and then liquid-tightening two castings by circumferential welding. 2. The rack type filtration apparatus according to claim 1, wherein the rack type filtration apparatus is manufactured by welding jointly. A rack-type housing characterized in that a circulating water flow path communicating with a housing body of the rack-type housing is liquid-tightly provided in a headband shape on the outer periphery of the housing body by welding and joining an outer plate to the housing body .

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