JPH01249103A - Filter plate for flat membrane-type separator - Google Patents

Abstract

PURPOSE:To prevent the wear of a filter body and a filter frame due to their repeated attachment and detachment by imparting an acuteangled taper to one side wall of the stepped peripheral edge of the window of a frame body, imparting the same taper to one side wall of the base plate of the frame body, matching both tapers, and incorporating the assembly. CONSTITUTION:A taper at an acute angle to a bottom wall surface 10 is provided to the stepped peripheral edge 9 of the frame body (a) of the filter plate for a filter membrane-type separator outside the window 2 to form a side wall surface 11, and protruding detaining parts 10a and 10b are formed on the outer and inner bottom wall surfaces 10 integrally with the frame body (a). Meanwhile, the same taper is provided to the side wall of a filter body (b) corresponding to the acute-angled side wall surface 11 of the window 2. When assembling is carried out, a filter membrane 7 is firstly laid over the base plate 3 of the filter body (b), the acute-angled side wall surface of the base plate 3 is allowed to abut on the stepped peripheral edge 9 of the acute-angled side wall surface of the window 2, and then the inner side of the base plate 3 is allowed to abut on the inner stepped peripheral edge 9. In this case, the detaining parts 10a and 10b of the window 2 are engaged with the engaging parts 3a and 3b of the base plate 3.

Description

Detailed Description of the Invention (Field of Industrial Application) This invention is applicable to a flat membrane separation device for membrane separation using a semipermeable membrane such as an ultrafiltration membrane or a reverse osmosis membrane. Regarding temporary.

(Prior art) Flat membrane separators are widely used in food manufacturing processes, wastewater treatment, etc. The furnace plate, which serves as the separation element, is a plate-shaped substrate made of synthetic resin with an uneven surface. It is constructed by providing a liquid collecting part and extending a filter membrane to this liquid collecting part.

A flat membrane separator is assembled by stacking a plurality of furnace plates with gaskets interposed between them. This is carried out by supplying a stock solution into the gap between the membranes and collecting the permeated liquid that has passed through the membrane in a liquid collecting section.

The processing capacity of a flat membrane separator is proportional to the filtration area. Therefore, if the surface area of the filter plate is large, membrane fraction lt treatment can be advantageously carried out.

Therefore, the present inventor previously produced a filter plate by injection molding the frame body and the filter body separately in Japanese Patent Application No. 100941/1982.
By combining these, we succeeded in creating a filter plate with a large membrane area.

That is, as shown in FIG. 6, the furnace plate 1 of this prior application has four rectangular windows 2, 2, . It is constructed by fitting a filter body as shown in the figure.

The filter body has a plate-shaped substrate 3 made of synthetic resin having the same external shape as the window portion 2, and a liquid collecting portion 6 formed by alternately arranging concave portions 4 and convex portions 5 on the front and back surfaces. , the furnace belly 7 is placed above this liquid collection part 6.
It is further formed by covering the top, bottom, left and right ends with a film stopper member 8.

To assemble the filter into the window 2, the periphery of the window 2 is formed into a stepped periphery 9 as shown in FIG. 8, and the periphery of the filter is fitted onto this bottom wall surface 10. This is done by holding the top surface of the filter with the micro protrusions 12 provided on the top of the side wall surface 11.

(Problems to be Solved by the Invention) However, since the above-mentioned Ga-board of the earlier application is designed to hold the filter body fitted in the window part of the frame body with minute protrusions,
If the filter body is removed from the frame many times to replace the filter membrane, etc., the micro protrusions will wear out, and eventually the filter body will no longer be able to be held.

In addition, due to the pressing force when assembling the furnace plates by stacking them, the left and right parts of the window, that is, the outer frame, swell, creating a gap between the filter body and the frame, which tends to cause liquid to leak. There was a problem.

(Means for Solving the Problems) The present invention has been made to solve the above problems, and includes a frame body having a rectangular window portion formed with a stepped peripheral edge, and a filter film on a substrate. In one door plate for a flat membrane type separator, which is constructed by fitting the filter body into the window part, the stepped peripheral edge side of one side of the window part The wall surface is formed to form an acute angle with the bottom wall surface, and the side wall surface of the i filter that faces the side wall surface forming the acute angle is formed to have the same angle as the side wall surface forming the acute angle. That is.

(Function) The present invention has the above-mentioned configuration, and operates so that the acute-angled side wall surface of the furnace plate contacts and matches the acute-angled side wall surface of the window portion.

(Example) An example of the present invention will be described based on the drawings. Note that the same reference numerals are given to the same components as in the prior art for explanation.

FIG. 1 is a front view of a furnace plate 1 for a flat membrane separator according to the present invention, which is composed of a frame a and a filter body.

Of these, frame a is made of synthetic resin and is integrally molded by injection molding, and has a flat, vertically rectangular shape as a whole, and has vertically long internal walls on the top, bottom, left and right. A rectangular window portion 2°2... is opened.

The periphery of each window portion 2, 2, . . . is formed with a stepped periphery 9, as shown in FIG. 2.3.

The stepped peripheral edge 9 on one side of the outside of each window portion 2.2... has a taper at an acute angle with respect to the bottom wall surface 10 to form a side wall surface 11, and the opposing outside and inside bottom wall surfaces At 10, protruding locking portions 10a and 10b are integrally formed with the frame a.

Above and below the frame body a, there are upper openings 13. which form the stock solution passage when the filter plates 1 are stacked. Lower opening 14. A permeated liquid hole 15 forming a permeated liquid passage and a concentrated liquid hole 16 forming a tank a liquid passage are opened, and a central opening 17 forming a passage for the stock solution is also opened in the center.

A ring-shaped gasket retaining groove 18 is provided around the back surface of the frame a, and the frame a corresponds to the groove 18.
A gasket contact groove 19 is provided on the surface of the gasket.

Further, support pieces 20 are integrally formed so as to protrude to the left and right above the frame a.

The filter body has the same external shape as the windows 2, 2, etc. of the frame body a, and its thickness is slightly thinner than the thickness of the frame body a.The filter membrane 9 is wound around a substrate 3 made of synthetic resin. It is configured.

Concave portions 4 and convex portions 5 are alternately provided at a predetermined interval on the front and back surfaces of the substrate 3 to form liquid collection portions 6,
A filter membrane 7 is wound in the longitudinal direction of the substrate 3 so as to cover this liquid collection part 6, and a membrane stopper member 8 is wrapped around the substrate 3 from above the furnace belly 7.
The membrane 7 is fixed by pressing it with.

The side wall shape of one outside side of the substrate 3, that is, the side wall shape corresponding to the side wall surface forming an acute angle of the above-mentioned windows 2, 2... has the same taper as the side wall surface forming an acute angle. window portions 2.2... are formed on the outer and inner bottom wall surfaces.
Recessed engaging portions 3a and 3b into which the protruding locking portions 10a and 10b are inserted are integrally formed with the substrate 3.

To assemble the filter body to the frame a, first attach the furnace belly 7 to the substrate 3 of the filter body i, and then attach it to the window parts 2, 2 of the frame body.
Insert it into...

That is, as shown by the two-dot broken line in FIG.
This is carried out by bringing the acute-angled side wall surface of the substrate 3 into contact with the stepped peripheral edge 9 of the side wall surface forming an acute angle, and then by contacting the inner side of the substrate 3 with the inner stepped peripheral edge 9. At this time, window 2.2
The locking parts 10a, 10b of... are the engaging parts 3a of the board 3,
3b.

After the filter body is fitted to the frame a, several locations (four locations in the embodiment) on the inside of the substrate 3 are fixed with countersunk screws 21 and washers 22. Therefore, a notch is provided in the frame a and the substrate 3 so that the washer r22 does not protrude from the surface of the frame a, and an insertion hole for the countersunk screw 21 is formed in the frame a.

On the other hand, in order to remove the filter from the frame a, it is sufficient to remove the screw 21 and washer 22 and press the inside of the filter from the back side of the frame a.

The permeate from the filter body incorporated in the frame a is passed through the permeate hole 1.
5, as shown enlarged in FIGS. 4 and 5, one corner of the substrate 3 is cut out, a rubber gasket 23 of the same size as this notch is glued to the substrate 3, and the transparent This is done by passing a pipe 24 through the rubber gasket 23 from the liquid hole 15.

Therefore, the frame body a of the permeated liquid hole 15 and the rubber packing 23 have through holes 2 that communicate with the liquid collecting section 6 provided in the substrate 3.
5 is provided.

The plate has a central opening 7, a permeated liquid opening 15, and concentrated liquid discharge holes 16 at the top and bottom.
Since this is the filter plate proposed by No. 1, the detailed explanation of the function of each hole will be left to the earlier application, but in order to assemble a flat membrane type separator using this furnace plate 1, first A plurality of sheets (for example, 10 sheets) are stacked together with a gasket interposed to form one unit, and this unit is connected to an intermediate plate (not shown).
Assemble by stacking multiple pieces together.

Also, for the first unit, the liquid passes through the upper and lower holes 13 and 14.
The stock solution flows from the central opening 17 toward the central opening 17, and in the next unit, it flows from the central opening 17 toward the upper and lower openings 13 and 14. Moreover, the concentrated liquid and the permeated liquid are also discharged from the passages formed when the filter plates are stacked.

According to this embodiment, the side wall on one side of the stepped periphery of the window portion of the frame body is tapered at an acute angle, and the side wall on one side of the substrate of the filter body is also tapered, and these tapers are matched with each other. Since the filter body is fitted into the furnace frame, the window portion does not wear out and the filter body and filter frame can be repeatedly assembled, resulting in a filter plate with excellent durability.

In addition, a locking portion is provided on the bottom wall surface of the facing stepped peripheral edge of the window, and an engaging portion that is fitted into the locking portion is provided on the substrate of the i-filter, so that multiple i-filters can be pressed. When stacking and assembling a membrane separation device, the substrate prevents the window of the frame from expanding due to this pressing force, effectively preventing the inconvenience of liquid leakage caused by a gap between the filter body and the filter frame. be done.

Generally speaking, since the permeate collected in the east liquid part of the i-filter is discharged to the permeate hole provided in the frame through a rubber gasket, there is no risk of the raw liquid getting mixed into the permeate. The permeate can be obtained effectively without any problems.

In addition, although the above-mentioned embodiment shows a plate with an opening in the center, it may be a conventional furnace plate without this, or it may have four filters on the top and bottom, left and right sides of the frame. We have shown an example of incorporating the
It is also possible to incorporate the information in the form of an individual or the like.

Generally speaking, the tapered stepped peripheral edge is provided on the outside of the window portion, but it may be provided on the inside. However, if it is provided outside as in this embodiment, it is convenient because the left and right filter bodies can be held with one washer.

(Effects) As described above, the present invention provides an acute angle taper to the side wall of one side of the stepped peripheral edge of the window portion of the frame, and also provides the same taper to the side wall of one side of the substrate of the filter body. Since they are aligned and assembled, the window part does not wear out unlike in the conventional case, and the i-filter and the furnace frame can be repeatedly assembled, resulting in a highly durable furnace plate.

In addition, a locking portion is provided on the bottom wall surface of the facing stepped periphery of the window, and an engaging portion that is fitted into the locking portion is provided on the substrate of the filter body, so that multiple filter bodies can be pressed and stacked. When assembling the membrane separator, the substrate prevents the window of the frame from expanding due to this pressing force, creating a gap between the filter and the furnace frame.
The disadvantage of liquid leakage occurring is effectively prevented.

[Brief explanation of the drawing]

1 to 5 show one embodiment of the present invention, in which FIG. 1 is a front view thereof, FIG. 2 is an enlarged sectional view taken along the line ■-■ in FIG. 1, and FIG. 1, FIG. 4 is an enlarged view of part A in FIG. 1, FIG. 5 is an enlarged sectional view along v-v line in FIG. 4, and FIGS. Fig. 6 shows the front view of the filter plate, and Fig. 7 shows the Vl-VI of Fig. 6.
The enlarged line sectional view and FIG. 8 are exploded perspective views of the T-filter. 1...Filter plate 2...Window section 3...Substrates 3a, 3b...Engaging section 6...Liquid collecting section 7...1 Door membrane 9...Stepped peripheral edge 10...・Bottom wall surfaces 10a, 10b...Locking portion 11...Side wall surface a...Frame body b...Filtering body Patent applicant Aqua Renaissance Technology Research Association Agent Patent attorney Kazu 1) Establishment Rule No. 2 Figure 3-7 Figure 4 Figure 5 Figure 6

Claims (1)

[Claims] 1. A frame body having a rectangular window portion formed with a stepped peripheral edge;
A filter plate for a flat membrane separator, comprising a filter body formed by stretching a filter membrane on a substrate, and the filter body is fitted into the window portion, comprising: a step on one side of the window portion; The side wall surface of the peripheral edge is formed to form an acute angle with the bottom wall surface, and the side wall surface of the filter body that faces the side wall surface forming the acute angle is formed to have the same angle as the side wall surface forming the acute angle. A filter plate for a flat membrane separator, characterized by the following.