JPH0454482B2 - - Google Patents

Description

[Detailed description of the invention]

(Field of Industrial Application) The present invention relates to a multi-tube filter that has a large filtration area and enables efficient filtration. More specifically, the present invention relates to a multi-tube filter that has a large filtration area and enables efficient filtration. The present invention relates to a multi-tube filter with high mechanical strength and a large filtration area. (Prior Art) Conventionally, as a method of increasing the filtration area of a filter, a multi-tube filter in which a plurality of cylindrical filter bodies are bundled into an integral structure is known from Japanese Patent Laid-Open No. 59-52511. Also known is a columnar body made of a porous body with a plurality of through holes for distributing the stock solution. (Problems to be Solved by the Invention) However, among the above-mentioned filters, the former multi-tube filter requires a large number of manufacturing man-hours and Since there is a space between the filter bodies, the mechanical strength is low. In addition, the latter multi-tube filter has a structure in which the filtrate is discharged in the direction of the outer circumference of the columnar multi-tube filter, so the filter must be housed in the can body to collect the filtrate, making the structure complicated. There were flaws. The purpose of the present invention is to solve the above-mentioned problems, to increase the filtration surface area per unit volume without increasing the filtration resistance, and to provide a multilayer structure that can be manufactured at low cost and that does not impair the mechanical strength of the structure. It is intended to provide a tube filter. (Means for Solving the Problems) The multitubular filter of the present invention has a plurality of through holes through which the stock solution flows, which are provided in a porous columnar body whose outer periphery is coated with a liquid-tight sealant, and a plurality of through holes through which the stock solution flows. a plurality of filtrate discharge holes provided between the holes through which the filtrate flows;
an end sealing plate having a plurality of through holes provided closely to the end surface of the columnar body and communicating with each of the through holes;
It is characterized by comprising a filtrate discharge groove that connects each filtrate discharge hole provided on either the end face of the columnar body or the close contact face of the end sealing plate that is in close contact with the end face. . (Function) With the above-described configuration, a part of the stock solution flowing through the through hole is filtered by passing through the porous columnar body, and the filtrate is passed through each filtrate discharge hole to the end sealing plate or the end face of the columnar body. The filtrate is collected in the filtrate drain groove and discharged to the outside of the filter. At this time, since each filtrate discharge hole is under negative pressure with respect to the through-hole, the filtrate does not flow back toward the through-hole. (Embodiment) FIG. 1 is a perspective view showing an embodiment of a multi-tube filter of the present invention. In this embodiment, an example is shown in which end sealing plates 2 are provided at both ends of a multitubular filter body 1 made of a porous cylindrical body in close contact with each other in a liquid-tight manner.
First, as shown in FIG. 2, which shows the cross-sectional shape of the multitubular filter body 1, a large number of through holes 3 through which the stock solution passes are arranged in a staggered manner in a porous cylindrical body preferably made of alumina, silica, mullite, cordierite, etc. It is extruded so that the filtrate discharge holes 5, through which the filtrate having a smaller diameter flows, are positioned at approximately equal intervals between each of the three triangular through-holes 3. Next, this extrusion molded body is dried and fired to form the multitubular filter body 1. The outer surface of the multi-tube filter body 1 is provided with a coating layer 4 by liquid-tightly coating it with a coating material such as glass. In addition,
At this time, preferably before or after firing the multitubular filter body 1, a suspension containing fine particles of alumina, silica, mullite, cordierite, etc. is caused to flow through each through hole 3 to coat the inner surface of the through hole 3 with these fine particles. When a particle suspension is deposited and fired, a filtration membrane 10 can be formed on the inner peripheral surface of the through hole 3 as shown in FIG. 2, which is more preferable. FIG. 3 is a front view showing one embodiment of the end sealing plate 2. FIG. The end sealing plate 2 of this embodiment has a through hole 6 that communicates with each through hole 3 of the filter body 1 and a filtrate discharge groove 7 that connects each filtrate discharge hole 5, and is in contact with the filter body 1. A joint portion 8 is provided in the portion. Therefore, when the end sealing plate 2 is attached to the end of the filter body 1, the stock solution and the filtrate are completely separated. Further, the end sealing plate 2 is provided with a discharge port 9 for collectively discharging the filtrate collected in the filtrate discharge groove 7 to the outside. Further, when joining the filter body 1 and the end sealing plate 2, it is preferable to seal them with an inorganic adhesive. Example 1 Using a base material with alumina as the main component and kaolin and an organic binder added, the maximum pore diameter after firing is 15 μm, 19 holes with an inner diameter of 7φ are arranged at equal intervals, and 19 holes with an inner diameter of 3φ are arranged at 7φ. Using a vacuum extruder, a cylinder with a diameter of 70 mm was extruded to a length of 60 cm, with one hole each in the center of a triangle consisting of three holes, and 18 holes on the outer periphery, for a total of 42 holes. . After drying, this multi-tube filter material was cut with a cutter into a length of 50 cm. Separately, the same method was used to extrude the material using a nozzle with 42 blind holes of 3.0φ, and after drying, the material was cut into 1.1 cm thick pieces using a cutter. Using a cutting tool, dig a filtrate drainage groove of 2.5 mm in thickness around the through hole, 4.0 mm in the outer periphery, and 3 mm in depth in the remaining part using a cutting tool to join the board. An end face sealing plate having a portion was prepared. In addition, a through hole was provided at one location on the outer periphery to create a discharge port. Furthermore, an adhesive glaze consisting of 60% feldspar, 20% kaolin, 15% silica sand, and 5% dolomite was wet-pulverized in a pot mill until the proportion of particles coarser than 5 μm was within 10%. Add 0.2% organic binder (CMC carboxymethyl cellulose) to this to reduce moisture content to 40%.
% slurry was prepared. Thereafter, glaze slurry was applied three times to a thickness of about 0.3 mm by brushing the grooved surface of the end sealing plate, being careful not to fill the grooves. Next, place the end sealing plate with the groove facing up on the baking table, place the multi-tubular filter on top of it, aligning it with the hole in the sealing plate, and place another end sealing plate on top of it. The stop plates were placed with the grooves facing downward and the holes aligned, surrounded by cylindrical sheaths to prevent them from shifting, and supported by shelf boards with holes of approximately 70φ, and fired at 1500°C in this state. . Furthermore, the average pore size
A filtration layer slurry containing alumina as a main component and having a thickness of 0.95 μm was coated to a thickness of 50 μm on the inner surface of the 19 holes of this multitubular filter as well as on both upper and lower end surfaces. After drying, the above-mentioned glaze was sprayed on the outer periphery to a thickness of about 0.2 mm, and then re-fired at 1500°C to obtain a multi-tube filter of the present invention. In addition, as a reference product, a multitubular filter was fabricated by bonding 19 cylindrical filter bodies each having an outer diameter of 10 mm, an inner diameter of 6 mm, and a length of 500 mm to an end portion of 70 mm in diameter using resin. Table 1 shows the characteristics of each filter.

[Table] From the results in Table 1, it can be seen that, compared to the reference example, the multi-tube filter of the present invention has a larger filtration area, fewer parts, and significantly improved mechanical strength. The present invention is not limited only to the embodiments described above, and numerous modifications and changes are possible. For example, in the above-described embodiment, the columnar body has a circular cross-sectional shape, but it may also have a polygonal shape. Furthermore, the arrangement of the through holes is not limited to a staggered pattern.
In addition, the filtrate drain groove may also be provided on the end face of the columnar body instead of on the end sealing plate, and the filtrate drain groove must also be provided on both the joining surfaces of the columnar body and the end sealing plate. Instead, it may be provided only on at least one of the joint surfaces of the columnar body and the end sealing plate. (Effects of the Invention) As is clear from the above detailed explanation, according to the multi-tube filter of the present invention, the filtration area is large and the filtration efficiency can be improved, and the space between the through hole and the discharge hole is porous. Since it is filled with filter material, it has high mechanical strength and can therefore be used at high filtration pressure. Further, the filtrate can be discharged all at once from one place, and there is no need to house the filter itself in a special can.
Furthermore, since the number of parts is significantly smaller than in conventional methods, it can be manufactured at a low cost.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing an embodiment of the multi-tube filter of the present invention, Fig. 2 is a sectional view of the embodiment shown in Fig. 1, and Fig. 3 is a front view showing an embodiment of the end sealing plate. It is a diagram. 1... Filter body, 2... End sealing plate, 3...
...Through hole, 4...Coating layer, 5...Filtrate discharge hole, 6
...Through hole, 7...Filtrate discharge groove, 8...Joint part, 9
...Discharge port, 10...filtration membrane.

Claims (1)

[Scope of Claims] 1. A plurality of through-holes through which the stock solution flows, provided in a porous columnar body whose outer periphery is coated with a liquid-tight sealant, and through which the filtrate flows between the through-holes. a plurality of filtrate discharge holes, an end sealing plate having a plurality of through holes that are provided in close contact with the end face of the columnar body and communicate with each of the through holes, and an end face of the columnar body or an end that is in close contact with the end face. 1. A multi-tube filter comprising a filtrate discharge groove that connects each filtrate discharge hole provided on one of the close contact surfaces of the sealing plate. 2. The multi-tube filter according to claim 1, wherein a filtration membrane made of a sintered body of fine particles is formed on the inner wall surface of the through hole. 3. Claim 1 or 2, wherein the filtrate discharge holes are provided at approximately equal intervals between three triangular through holes among the plurality of through holes provided in a staggered manner.
Multi-tube filter as described in section. 4. The multitube filter according to any one of claims 1 to 3, wherein the columnar body has a hexagonal cross-sectional shape.