JPH0451852Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to an improvement of a tubular membrane separation module used under relatively low pressure such as ultrafiltration or microfiltration.

<Prior Art and Problems> The present applicant has developed a tubular membrane separation module for use under relatively low pressures such as ultrafiltration, in which a plurality of separation tubes each having a permeable membrane formed on the inner surface of a nonwoven fabric tube are placed inside an outer cylinder. It has already been proposed that a partition wall formed by filling and solidifying a resin material is provided between the inner surface of the outer cylinder and the outer surface of the separation tube at both ends of the outer cylinder.

This tubular membrane separation module has the following advantages:
That is, (1) the seal between the outer tube end and the separation tube end does not require any accessory parts such as a packing or retainer, so it is easy and inexpensive to manufacture; and (2) the separation tubes can be tightly bundled. , the membrane area per module unit area can be increased. (3) Only the outside of the separation tube end is filled with synthetic resin material, so the cross-sectional area of the flow path can be secured in the seal part as well as in other parts,
Pressure loss can be reduced (4) The outer surface of the separation tube is made of non-woven fabric, and the non-woven fabric blends well with the synthetic resin for casting, resulting in excellent sealing properties. (5) Due to the water-retaining properties of the non-woven fabric itself, the module It has the advantage that the permeable membrane can be easily prevented from drying during storage. It is necessary to attach a socket pipe to the above tubular membrane separation module for connection with piping.
As shown in FIG. 1, it is conceivable to provide a socket between the end of the outer cylinder and the resin partition wall, and to fit the socket pipe into this socket via an adhesive.

By the way, when fitting this socket pipe,
Hoop stress (circumferential tensile stress) acts on the socket, and the influence of the hoop stress on the adhesive interface between the outer cylinder and the resin partition wall is unavoidable. On the other hand, in the injection of resin material for resin partition molding,
Since the nonwoven fabric tube is flexible, the injected resin cannot be pressurized and must be injected under normal pressure, so the adhesive strength at the interface between the outer cylinder and the resin partition wall cannot be made very strong.

Therefore, when the stress that spreads to the adhesive interface between the outer cylinder and the resin partition wall becomes large, the adhesive strength of the adhesive interface is not so strong, so the interface easily peels off, and the sealing performance of the partition wall is ensured. It's difficult.

<Purpose of the invention> The purpose of the invention is to provide a tubular membrane separation module that can sufficiently ensure the sealing performance of the adhesive interface between the outer cylinder and the resin partition wall despite the attachment of a socket pipe.

<Configuration of the invention> In the tubular membrane separation module of the invention, a plurality of separation tubes are inserted into an outer cylinder, and a membrane is inserted between the inner surface of the outer cylinder and the outer surface of the separation tube at a location inside the outer cylinder separated by a predetermined distance from the end of the outer cylinder. A partition wall is provided by filling and solidifying a resin material into the container, and the inner surface of the outer cylinder socket portion between the partition wall and the outer cylinder end has a tapered surface with an inner diameter that becomes larger as it reaches the outer cylinder end, The inner surface of the insertion part of the socket pipe is a tapered surface with an inner diameter that becomes larger as it reaches the tip of the insertion part, and the outer diameter of the insertion part is larger than the inner diameter of the inner end of the outer cylinder socket part. , the insertion part of this socket pipe is inserted into the above-mentioned outer cylinder socket part through an adhesive coating layer,
This structure is characterized in that the adhesive squeezed at the tip of the insertion part of the socket pipe covers the boundary between the inner surface of the outer cylinder and the partition wall.

<Explanation of Examples> The present invention will be explained below with reference to the drawings.

In FIG. 1, 1, . . . are separation tubes, and a tubular permeable membrane 12 is formed on the inner surface of a nonwoven fabric tube 11. The outer diameter of the separation tube is usually 4 to 25 mm, and in addition to polyester nonwoven tubes, nonwoven tubes made of polyethylene, polypropylene, polyamide, or cellulose can also be used. Reference numeral 2 designates an outer cylinder, which has socket portions 21, 21 with tapered inner surfaces at both ends thereof, and surface roughened portions 22, 22 are provided adjacent to these socket portions, respectively. 23 is a permeate outlet.

For this outer cylinder, a synthetic resin pipe such as polyvinyl chloride, acrylic resin, polyethylene, FRP, etc. can be used. As shown in FIG. 2, the above-mentioned separation tubes 1, . . . are inserted into the outer cylinder 2 in a dense group. In FIG. 1, reference numerals 3 and 3 denote resin partition walls, which are molded by filling and solidifying a synthetic resin material for casting between the roughened portion 22 on the inner surface of the outer cylinder and the separation tube 1.

To form this partition wall, as shown in FIG.
3 is a rubber plate, 44, ... are fixing screws) are inserted into each separation tube end 10, and the outer tube 2 is erected (the erected angle is
45 to 90°), the resin may be injected through the perforation 25 provided in the socket. Epoxy resin is usually used as the casting resin, but polyester resin and epoxy acrylate curable resin can also be used.

In FIG. 1, reference numerals 5 and 5 indicate socket tubes, which have an insertion port 52 on the distal end side, and the inner surface of the insertion port has a tapered surface 51, and the wall thickness becomes gradually thinner toward the distal end side.

The taper angle α of the tapered surface 51 is usually 10 to 60 degrees, and the material of the socket tube is usually the same as that of the outer cylinder.

After applying adhesive to the outer surface of the insertion part 52 of the socket pipe 5 and the inner surface 210 of the socket part of the outer cylinder, the insertion part 52 of the socket pipe 5 is inserted into the socket part 21 of the outer cylinder. There is. The inner diameter R ₁ of the inlet of the socket 21 is slightly larger than the outer diameter R ₂ of the socket of the socket pipe 5, but the inner diameter R ₃ of the inner end of the socket is larger than the outer diameter R ₂ of the socket of the socket pipe. It is slightly smaller,
Therefore, as the socket pipe 5 is inserted, hoop stress acts on the socket portion 21 of the outer cylinder.

When this socket pipe is inserted, a part of the adhesive on the inner surface of the outer cylinder receptacle is squeezed at the tip of the socket pipe, and this adhesive a forms the boundary P between the outer cylinder and the resin partition wall, as shown in Fig. 4. , the sealing performance between the outer cylinder and the resin partition wall can be improved.

The distance between the tip of the socket pipe and the resin partition is 2 to 5 mm.
A distance of preferably 3 mm is preferred.

In the above, the outer diameter of the insertion part of the socket tube is
It is slightly larger than the inner diameter of the socket part of the outer cylinder (average inner diameter), the inner diameter of the socket part of the outer cylinder is R, the thickness is T,
The Young's modulus is E, and the outer diameter of the insertion part of the socket pipe is R.
+ΔR, the thickness is t, and Young's modulus is E, the hoop stress δ acting on the socket of the outer cylinder is δ=EΔR/R(1/1+T/t) −.

In this way, in the hoop stress generated in the outer cylinder, the stress that spreads to the adhesive interface between the outer cylinder and the resin partition wall is the stress (called stress δ ₀₎ in the outer cylinder part located at the tip of the socket tube near this adhesive interface. ) However, since the thickness t of the tip of the socket tube is made sufficiently thin by tapering the inner surface of the tip, as is clear from the result of reducing t in the first equation, The stress δ ₀ can be made sufficiently small, and therefore the stress δ ₀ that spreads to the adhesive interface can be made sufficiently small.

<Effects of the invention> The tubular membrane module of the present invention has the configuration as described above, and when inserting the insertion part of the socket tube into the socket of the outer cylinder, the membrane module is coated on the inner surface of the outer cylinder socket and the outer surface of the socket tube insertion opening. The squeezed adhesive is squeezed at the tip of the socket, and the squeezed adhesive covers the boundary between the inner surface of the outer cylinder and the bulkhead. In this case, the tip of the socket pipe is made thinner, suppressing the forced diameter expansion of the socket of the outer cylinder due to insertion of the socket pipe, and eliminating separation of the adhesive interface between the outer cylinder and the partition wall. Therefore, the sealing performance at the interface between the outer cylinder and the partition wall can be improved as a whole.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing a tubular membrane separation module according to the present invention, FIG. 2 is a cross-sectional view of FIG. FIG. 3 is an explanatory diagram showing a method of attaching a socket pipe in the module of the present invention. In the figure, 1, ... are separation tubes, 11, ... are nonwoven pipes, 2 is an outer cylinder, 21, 21 are socket parts, 5, 5
is a socket pipe, and 51, 51 are tapered surfaces of the socket pipe.

Claims (1)

[Scope of utility model registration request] A plurality of separation tubes are inserted into the outer cylinder, and a partition wall is provided at a location within the outer cylinder at a predetermined distance from the end of the outer cylinder by filling and solidifying a resin material between the inner surface of the outer cylinder and the outer surface of the separation tube, The inner surface of the outer tube receptacle between the partition wall and the outer tube end is a tapered surface with an inner diameter that becomes larger as it reaches the outer tube end, and the inner surface of the socket tube insertion portion is tapered to the outer tube end. The socket tube has a tapered surface with an inner diameter that becomes larger toward the tip, and the outer diameter of the socket tube is larger than the inner diameter of the inner end of the outer cylinder socket, and the socket tube has a tapered surface with an inner diameter that becomes larger toward the tip. The socket is fitted into the socket via an adhesive coating layer, and the adhesive squeezed at the tip of the socket tube covers the boundary between the inner surface of the outer cylinder and the partition wall. Tubular membrane separation module.