JP4025441B2 - Hollow fiber membrane cartridge and manufacturing method thereof - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a hollow fiber membrane cartridge installed in a tank type filtration device or a rack type filtration device and a method for producing the same. More specifically, the present invention relates to a hollow fiber membrane cartridge used in a filtration device that performs turbidity and sterilization in large quantities using river water, lake water, groundwater, seawater, domestic wastewater, or factory wastewater as raw water.
[0002]
[Prior art]
Conventionally, in order to suspend and support a small hollow fiber membrane cartridge in a filtration tank of a tank type filtration device or a housing of a rack type filtration device, a generally applied technique is a flange of a cartridge head of the hollow fiber membrane cartridge. This is a method of holding the outer periphery of the flange portion with both hands and attaching it to the filtration tank or the housing.
[0003]
However, this method can be applied to a lightweight hollow fiber membrane cartridge having a small diameter and a short length, but is relatively applicable to a water treatment for purifying a large amount, which is an object of the present invention. This method cannot be applied to hollow fiber membrane cartridges with large dimensions.
In addition, in order to perform a hanging process for hanging on the flange of the cartridge head, it is necessary to increase the diameter of the flange or to increase the thickness of the flange. In the former case, there is a problem that the outer diameter size of the tank type filtration device and the rack type filtration device is increased, and in the latter case, the amount of the adhesive forming the brim portion is increased and at the same time the length of the hollow fiber membrane cartridge is reduced. There is a problem of increasing the size.
[0004]
[Problems to be solved by the invention]
The present invention solves the above-mentioned problems, and an object of the present invention is to make it easy to attach and detach a hollow fiber membrane cartridge including a large size in a filtration tank or a housing, It is an object of the present invention to provide a hollow fiber membrane cartridge capable of reducing the size of a rack type filtration device and a method for producing the same.
[0005]
[Means for Solving the Problems]
The present invention solves the above problems.
That is, the present invention relates to a hollow fiber membrane cartridge in which a plurality of hollow fiber membranes are bundled and supported in a filtration tank of a tank type filtration device or in a housing of a rack type filtration device. The membrane is fixed to each other with an adhesive at one end, and a hollow portion is opened on the end surface of the adhesive fixing layer, and screw holes of one or a plurality of nuts embedded in the adhesive fixing layer are opened. The present invention relates to a hollow fiber membrane cartridge.
[0006]
Furthermore, this invention inserts one or a plurality of nuts between the hollow fiber membranes at one end of the hollow fiber membrane bundle, sets an adhesive jig on the outer periphery of the end of the hollow fiber membrane bundle, After a predetermined amount of adhesive is injected into the enclosed area and solidified, a part of the bonded and solidified hollow fiber membrane bundle end is cut, and the hollow portion of the hollow fiber membrane and the screw hole of the nut are formed on the cut surface. The present invention relates to a method of manufacturing a hollow fiber membrane cartridge characterized by being opened.
[0007]
By adopting the configuration as described above, the hollow fiber membrane cartridge can be lifted by using a detachable jig having a male threaded portion that can be screwed into a screw hole of a nut opened on the end surface of the adhesive fixing layer. It can be easily attached to and detached from the filtration tank of the apparatus or the housing of the rack type filtration apparatus.
As a detachable jig applied to the hollow fiber membrane cartridge, for example, a commercially available so-called eyebolt composed of a male screw portion and an O-shaped hanging portion at the upper end thereof can be applied.
[0008]
In addition, since the nut is embedded in the adhesive fixing layer, it is not necessary to enlarge or increase the thickness of the flange of the cartridge head for the hanging process, and the size of the filtration device can be reduced.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the hollow fiber membrane cartridge according to the present invention will be described with reference to the drawings.
FIG. 1 is a cross-sectional explanatory view showing an example of a hollow fiber membrane cartridge according to the present invention suspended and supported in a tank of a tank type filtration apparatus, and FIG. 2 is suspended and supported in a housing of the rack type filtration apparatus. Cross-sectional explanatory drawing which shows an example of the hollow fiber membrane cartridge which concerns on this invention, FIG. 3 is a principal part expanded sectional view which shows the structure of the hollow fiber membrane cartridge which concerns on this invention, and its attachment / detachment jig. FIG. 4 is an enlarged cross-sectional view of the main part of the cartridge head portion for explaining the method for producing the hollow fiber membrane cartridge according to the present invention.
[0010]
The hollow fiber membrane cartridge 4 of the present invention illustrated in FIG. 1 includes a large number of hollow fiber membranes 3, adhesive fixing layers 11 and 15, a cartridge head 12, a detachable nut 13, and a skirt member 14.
The hollow fiber membrane 3 is opened at its upper end and closed at its lower end. A large number of hollow fiber membranes 3 are bundled and the outer periphery of the upper end is integrally bonded with an adhesive to form the adhesive fixing layer 11. Further, the adhesive fixing layer 11 is inserted into a cylindrical cartridge head 12 and fixed to the cartridge head 12 with an adhesive.
[0011]
A detachable nut 13 is embedded in the adhesive fixing layer 11 of the hollow fiber membrane cartridge 4. The detachable nut is cylindrical and the inner peripheral surface has a female screw shape. The lower end of the detachable nut is closed, but the upper end is open. The detachable nut is embedded in the length direction of the hollow fiber membrane cartridge, and the upper end thereof coincides with the upper surface of the hollow fiber membrane cartridge. The outer peripheral side of the attaching / detaching nut 13 is fixed to the adhesive fixing layer 11.
[0012]
The outer peripheral side of the attaching / detaching nut can take an appropriate shape as appropriate. For example, the outer peripheral surface may be a male screw shape or an uneven shape.
Further, the embodiment shown in FIG. 1 is a case where the attaching / detaching nut embedded in the upper end of the adhesive fixing layer 11 is one in the center, but it corresponds to a case where a high load is applied, etc. It is also possible to arrange the nuts symmetrically.
[0013]
Since the cartridge head 12 serves as a fixing part when the hollow fiber membrane cartridge 4 is suspended in the filtration tank of the tank type filtration device or the housing of the rack type filtration device, the shape of the cartridge head 12 is manufactured in accordance with the suspension / fixation structure. Is done. For example, a shape with a flange as shown in the figure may be used, or a shape in which a step or a groove is provided on the outer periphery.
A skirt member 14 protrudes from the end surface of the hollow fiber membrane and is fixed to the outer periphery of the end portion of the hollow fiber membrane bundle opposite to the cartridge head 12. In FIG. 1, the hollow fiber membrane between the cartridge head and the skirt member is exposed naked, but the hollow fiber membrane bundle between the cartridge head and the skirt member may be covered with an outer case as in the conventional cartridge. .
[0014]
The material of the cartridge head 12, the detachable nut 13, and the skirt member 14 constituting the hollow fiber membrane cartridge 4 is not particularly limited and may be the same or different, but a thermoplastic resin or stainless steel is preferably used. The cartridge head 12 may be made of the same material as the adhesive used for the adhesive fixing layer. As the adhesive used for the adhesive fixing layers 11 and 15, a polymer material such as an epoxy resin, a urethane resin, or an epoxy acrylate resin can be applied. When it is desired to improve the shrinkage and strength of the adhesive, the adhesive may contain a fibrous material such as glass fiber or carbon fiber, or fine powder such as carbon black, alumina, or silica.
[0015]
As the hollow fiber membrane 3 used in the present invention, a microfiltration membrane, an ultrafiltration membrane, a reverse osmosis membrane, or the like can be used. The material of the hollow fiber membrane 3 is not particularly limited, and polysulfone, polyethersulfone, polyimide, polyetherimide, polyamide, polyetherketone, polyetheretherketone, polyethylene, polypropylene, poly-4-methylpentene, cellulose, cellulose acetate, Polyvinylidene fluoride, polyethylene-tetrafluoroethylene copolymer, polytetrafluoroethylene and the like are used. A composite material membrane using a plurality of these materials can also be used as the hollow fiber membrane. As the shape of the hollow membrane yarn, a membrane having an inner diameter of 50 μm to 3000 μm and an inner / outer diameter ratio of 0.3 to 0.8 can be used.
[0016]
In the hollow fiber membrane cartridge of the present invention, for example, one or more nuts are inserted between the hollow fiber membranes at one end of the hollow fiber membrane bundle, and an adhesive jig is attached to the outer periphery of the end of the hollow fiber membrane bundle. After setting and solidifying by injecting a predetermined amount of adhesive into the area surrounded by the bonding jig, part of the bonded and solidified hollow fiber membrane bundle end is cut, and the hollow portion of the hollow fiber membrane is cut on the cut surface And can be manufactured by opening the screw holes of the nut.
[0017]
Hereinafter, an example (FIG. 1) of a tank type filtration apparatus in which a hollow fiber membrane cartridge according to the present invention is suspended and fixed will be described.
In FIG. 1, reference numeral 1 denotes a tank type filtration apparatus that performs filtration by supplying a stock solution. For example, domestic wastewater, river water, lake water, groundwater or seawater is used as raw water to purify a large amount by microfiltration or ultrafiltration. Applicable to water treatment. In FIG. 1, as an embodiment, a case where the hollow fiber membrane cartridge of the present invention is applied to a so-called all-filtration tank type filtration device that performs filtration without circulating the stock solution will be described. The present invention can be similarly applied to a cross-flow filtration tank type filtration apparatus.
[0018]
The filtration tank 2 of the tank-type filtration device 1 is composed of a tank body 2a and a lid 2b that are arranged at the lower part and are erected by support means (not shown), and are separated at a predetermined height position on the inner wall of the tank body 2a. 5. The partition plate 6 is fixed in a liquid-tight and air-tight manner by welding or the like.
Thereby, the space formed by the lower part of the tank body 2a and the separation plate 5 forms the supply chamber 7, and the space formed by the middle portion of the tank body 2a, the separation plate 5 and the partition plate 6 forms the supply water chamber 8. Is forming.
[0019]
The lid 2b is fixed in a liquid-tight and air-tight manner to the upper portion of the tank body 2a by a fixing means (not shown) via the packing 9, and the treated water chamber 10 is formed by a space formed by the upper partition plate 6 and the lid 2b. Is formed.
Thus, the internal space of the filtration tank 2 is divided into three chambers by the separation plate 5 and the partition plate 6, and one end of the hollow fiber membrane cartridge 4 according to the present invention is supported by the partition plate 6 in the supply chamber 8. I'm hanging.
[0020]
A skirt member 14 is fixed to the outer periphery of the lower end portion of the hollow fiber membrane cartridge 4 by an adhesive layer 15. In the adhesive layer 15, as shown in FIG. 1, through holes 15 a for introducing raw water and a cleaning gas or liquid into the hollow fiber membrane 3 bundle and guiding them to the respective outer peripheral side surfaces of the hollow fiber membrane 3. Is formed.
The separation plate 5 is provided with a hole that allows the supply chamber 7 and the supply chamber 8 to communicate with each other below the hollow fiber membrane cartridge 4 suspended in the supply chamber 8. The hole may have the shape of the nozzle 5a as illustrated in FIG.
[0021]
The partition plate 6 that suspends and supports the hollow fiber membrane module 4 has the upper surface of the hollow fiber membrane cartridge 4 and the partition plate 6 depending on the weight of all the hollow fiber membrane cartridges 4 and the internal pressure (water pressure) applied to the inside of the treated water chamber 10. A plurality of through-holes 6a through which the hollow fiber membrane cartridge 4 is inserted are formed at predetermined positions.
[0022]
Bolts 16 are attached to the upper surface of the partition plate 6 in the vertical direction. The nut 18 is fitted to the bolt 16 and tightened with the packing 17 sandwiched between the lower surface of the flange portion 12a of the cartridge head 12 to fix the cartridge head 12 to the partition plate 6, and the hollow fiber membrane cartridge 4 is stably filtered. It is accommodated in the tank 2.
In the above configuration, during the filtration operation by the tank type filtration device 1, the raw water supplied to the supply water chamber 7 from the raw water port 2 c provided in the lower part of the tank body 2 a of the filtration tank 2 from the pump (not shown) The supply water chamber 8 is supplied from the nozzle 5 a to fill the supply water chamber 8, and is guided from the skirt member 14 to the outer peripheral side surface of each hollow fiber membrane 3 through the through hole 15 a of the adhesive fixing layer 15.
[0023]
The raw water in the vicinity of the outer periphery of each hollow fiber membrane 3 is pressure filtered from the outside to the inside of the hollow fiber membrane 3, and the filtrate is introduced into the treated water chamber 10 from the open upper end of the hollow fiber membrane 3. It is burned. The filtered water accommodated in the treated water chamber 10 is taken out of the filtration tank 2 from the treated water outlet 2d provided in the upper part of the lid 2b.
When the hollow fiber membrane 3 is backwashed with filtrate, suspended water (non-permeate) accumulated on the outer wall of the hollow fiber membrane 3 by supplying filtrate from the treated water outlet 2d and backflowing into the supply water chamber 8. Is discharged from the nozzle 5a to the supply water chamber 7, and discharged from the raw water port 2c provided at the lower portion of the tank body 2a to the outside of the filtration tank 2.
[0024]
The hollow fiber membrane cartridge 4 according to the present invention can also be attached in the housing 22 of the rack type filtration device 21. FIG. 2 is an example showing a structure in which the hollow fiber membrane cartridge 4 is mounted in the housing 22 of the rack type filtration device 21.
In the hollow fiber membrane cartridge 4, the flange portion 12 a of the cartridge head 12 is sandwiched between the upper housing head 22 b and the upper cap 26, and fixed and suspended by the upper screw-in cap 29. A hollow fiber membrane cartridge is obtained by tightening the screw 27a of the upper screw cap 29 with the packing 27 between the flange portion 12a of the cartridge head 12 and the upper housing head 22b and the O-ring sandwiched between the flange portion 12a and the upper cap 26. 4 is liquid-tightly and stably attached to the housing.
[0025]
The hollow fiber membrane cartridge 4 attached in the housing 22 of the rack type filtration device 21 in FIG. 2 is assigned the same reference numeral as the hollow fiber membrane cartridge 4 attached to the tank type filtration device 1 in FIG. The description is omitted.
When the hollow fiber membrane cartridge 4 is inserted / removed vertically into / from the tank-type filtration device 1 and the rack-type filtration device 21 to be attached / detached to / from the filtration tank 2 or the housing 22, for example, as shown in FIG. A detachable jig 41 can be used.
[0026]
The attachment / detachment jig 41 is a so-called eyebolt, and includes a male screw portion 41a and an O-shaped hanging portion 41b at the upper end thereof. The material of the attachment / detachment jig 41 is, for example, stainless steel, carbon steel, glass fiber reinforced plastic, or the like.
For mounting in the filtration device, the detachable jig 41 is rotated and fitted in the circumferential direction to one or more detachable nuts 13 embedded in the adhesive fixing layer 11 of the hollow fiber membrane cartridge 4. The attachment / detachment jig 41 is fixed to the hollow fiber membrane cartridge 4 and the hoisting hook 41b is hung on the hanging part 41b of the attachment / detachment jig 41 to suspend the hollow fiber membrane cartridge 4, and the hollow fiber membrane cartridge 4 is stored in the tank. It is inserted into the through hole 6 a of the partition plate 6 of the mold filtration device 1 or the housing main body 22 of the rack type filtration device 21.
[0027]
According to the above configuration, the hollow fiber membrane cartridge having a large diameter or length and the heavy hollow fiber membrane cartridge can be easily mounted in the filtration tank or the housing.
In addition, after the attachment, the attachment / detachment jig 41 can be easily removed from the attachment / detachment nut 13 embedded in the adhesive fixing layer 11 of the hollow fiber membrane cartridge 4 by rotating the attachment / detachment jig 41 in the circumferential direction. I can do it.
[0028]
In the case of a hollow fiber membrane cartridge having a small diameter and a short length as in the prior art, since the weight is also small, the hollow fiber membrane cartridge 4 is removed from the filtration tank 2 or the housing 22 by holding the flange portion 12a of the cartridge head 12 with both hands. Although it is possible to attach and detach, the method cannot be applied to a hollow fiber membrane cartridge having a relatively large size that can be applied to a large amount of water treatment or the like that is an object of the present invention.
[0029]
In the present invention, since the detachable nut 13 is embedded in the adhesive fixing layer 11 of the hollow fiber membrane cartridge 4, it is not necessary to apply a hanging process for the suspension to the cartridge head 12. Therefore, it is not necessary to increase the thickness and outer diameter of the cartridge head 12 for processing the hanging portion, and the outer diameter and height of the tank type filtration device 1 and the rack type filtration device 21 are not increased.
[0030]
In addition, in the said embodiment, the shape of the O-shaped hanging part 41b of the upper end of the attachment / detachment jig 41 can be selected suitably, and it is applicable even if it is a hook-shaped hanging part with one end released.
Moreover, in FIG. 3, although the fitting part of the attachment / detachment jig 41 and the nut 13 for attachment / detachment is a screw shape as embodiment of this invention, it is possible to select an arbitrary shape for a fitting part.
[0031]
Next, a method of embedding the detachable nut 13 in the adhesive fixing layer 11 will be described with reference to FIG. 4 as an example.
One or a plurality of attaching / detaching nuts 13 are inserted into the end portion of the hollow fiber membrane 3 bundle, the cartridge head 12 and the adhesive jig 51 are set on the outer periphery of the hollow fiber membrane 3 bundle end, and the cartridge head 12 and the adhesive jig 51 are set. A predetermined amount of adhesive is injected into the enclosed area. Since the bundle of hollow fiber membranes 3 is set in the cartridge head 12 in advance, the injected adhesive is filled around the hollow fiber membrane 3 and the detachable nut 13. After the adhesive is cured, the bonding jig 51 is removed. Further, along the cut surface 52 in the figure, the respective ends of the cartridge head 12, the adhesive fixing layer 11, the hollow fiber membrane 3 and the embedded nut 13 are cut so that the nuts for attachment and detachment and the ends of the hollow fiber membrane are made. Open.
[0032]
In order to prevent the adhesive from entering the screw hole of the detachable nut 13, the detachable nut 13 may be attached in a liquid-tight and water-tight manner to a recess provided in the bonding jig 51 in advance. A method of setting the detachable nut in which the screwed lid is fitted to the screw hole end of the detachable nut 13 in the hollow fiber bundle 3 may be used.
The above method is the most desirable method for embedding the attaching / detaching nut 13 in the adhesive fixing layer 11, but other methods such as press fitting or screwing the attaching / detaching nut 13 into the adhesive fixing layer 11 after curing are also applicable. Is possible.
[0033]
【The invention's effect】
Since the present invention has the above-described configuration and action, the male screw portion 41a of the attachment / detachment jig 41 is placed in the circumferential direction with respect to the attachment / detachment nut 13 embedded in the adhesive fixing layer 11 of the hollow fiber membrane cartridge 4. The attachment / detachment jig can be easily fixed to the hollow fiber membrane cartridge by being rotated and fitted to the hollow fiber membrane cartridge, and is hollowed by a hoist such as a hoist via the O-shaped hanging portion 41b at the upper end of the attachment / detachment jig. The thread membrane cartridge can be suspended and inserted into the filtration tank 2 or housing 22, and the hollow fiber membrane cartridge can be suspended in the filtration tank or housing.
[0034]
After the attachment, the attachment / detachment jig 41 can be easily removed from the attachment / detachment nut 13 embedded in the adhesive fixing layer 11 of the hollow fiber membrane cartridge by rotating the attachment / detachment jig 41 in the circumferential direction.
As described above, according to the present invention, the hollow fiber membrane cartridge 4 including a large size can be easily attached to and detached from the filtration tank or the housing.
[0035]
In addition, since the attaching / detaching nut 13 is embedded in the adhesive fixing layer 11, it is not necessary to apply a hanging process to the cartridge head 12. Therefore, it is not necessary to increase the thickness and outer diameter of the flange 12a of the cartridge head 12 for processing the hanging portion, and the outer diameter and height of the tank type filtration device 1 and the rack type filtration device 21 are not increased. There is an advantage that the size of the filtration device can be reduced.
[Brief description of the drawings]
FIG. 1 is a cross-sectional explanatory view showing an example of a tank-type filtration device in which a hollow fiber membrane cartridge according to the present invention is suspended and supported in a filtration tank.
FIG. 2 is a cross-sectional explanatory view showing an example of a rack type filtration device in which a hollow fiber membrane cartridge according to the present invention is suspended and supported in a housing.
FIG. 3 is an enlarged cross-sectional view of a main part showing the configuration of a hollow fiber membrane cartridge and a detachable jig according to the present invention.
FIG. 4 is an enlarged cross-sectional view of a main part showing an example of a method for producing the hollow fiber membrane cartridge in which a detachable nut is embedded in an adhesive fixing layer of the hollow fiber membrane cartridge according to the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Tank type filtration apparatus 2 ... Filtration tank 2a ... Tank main body 2b ... Lid 2c ... Raw water inlet 2d ... Treated water outlet 3 ... Hollow fiber membrane 4 ... Hollow fiber membrane cartridge 5 ... separation plate 5a ... nozzle 6 ... partition plate 6a ... through holes 7, 8 ... feed water chamber 9 ... packing 10 ... treated water chamber 11 ··· Adhesive fixing layer 12 ··· Cartridge head 12a ··· Flange portion 13 ··· Detachable nut 14 · · · Skirt member 15 · · · Adhesive layer 15a · · · through hole 16 · · · Bolt 17 ··· Packing 18 ··· Nut 21 ··· Rack type filter 22 · · · Housing body 22a · · · Pipe 22b · · · Upper housing head 22c · · · Male screw 22d · · · Horizontal nozzle 22e · · · Circulation Water port 22f ... Lower housing head 22g ... male screw 23 ... lower cap 23a ... raw water port 24 ... O-ring 25 ... lower screw-in cap 25a ... female screw 26 ... upper cap 26a ... treated water port 27 ··· Packing 28 ··· O-ring 29 ··· Upper screw cap 29a ··· Female screw 30 ··· Eye plate 41 · Detachment jig 41a · · · Male screw portion 41b · · · O-shaped hanging portion 51 · ..Adhesive jig 52 ... cut surface

Claims (2)

A hollow fiber membrane cartridge in which a plurality of hollow fiber membranes are bundled and supported in a filtration tank of a tank type filtration device or in a housing of a rack type filtration device,
The hollow fiber membranes are fixed to each other with an adhesive at one end, and the hollow portion is opened at the end surface of the adhesive fixing layer, and one or a plurality of nut screw holes embedded in the adhesive fixing layer are opened. A hollow fiber membrane cartridge characterized by One or more nuts are inserted between the hollow fiber membranes at one end of the hollow fiber membrane bundle, an adhesive jig is set on the outer periphery of the end of the hollow fiber membrane bundle, and the region surrounded by the adhesive jig After a predetermined amount of adhesive is injected and solidified, a part of the bonded and solidified hollow fiber membrane bundle end is cut, and the hollow portion of the hollow fiber membrane and the screw hole of the nut are opened on the cut surface A method for producing a hollow fiber membrane cartridge.

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