WO2023240828A1

WO2023240828A1 - Housing structure and hollow fiber membrane separator

Info

Publication number: WO2023240828A1
Application number: PCT/CN2022/121160
Authority: WO
Inventors: 杨正根; 付守军; 李浩源; 吴硕莹; 刘晓红; 陈校园
Original assignee: 广州康盛生物科技股份有限公司
Priority date: 2022-06-15
Filing date: 2022-09-26
Publication date: 2023-12-21

Abstract

The present invention relates to the field of membrane separation. Disclosed are a housing structure and a hollow fiber membrane separator. The housing structure comprises a cylindrical housing, flexible pieces circumferentially arranged at intervals are provided at both ends of a main body, and at least some of the flexible pieces are provided with a convex-concave structure. According to the housing structure of some embodiments of the present invention, by means of special structural design of the top end of the flexible piece, the contact area between the top end of the flexible piece and a potting adhesive is greatly increased, so that good adhesive hanging is achieved, thereby improving the sealing effect between a fiber bundle and the housing and reducing yield loss. According to the housing structure of some embodiments of the present invention, by providing a reasonable convex-concave structure, a product can be simply demolded, the processing is simple, and the costs are low.

Description

A shell structure and hollow fiber membrane separator

Technical field

The invention belongs to the field of membrane separation, and specifically relates to a shell structure and a hollow fiber membrane separator.

Background technique

Hollow fiber membrane separation devices generally include a cylindrical shell, a hollow fiber bundle, a sealing layer and end caps at both ends. For environmental protection and safety, the cylindrical shell is mostly made of polypropylene. The membrane separation device is a pipe and container for solute exchange between two fluids. The membrane separation device is divided into two flow spaces through the above structure. The hollow fiber bundle is placed in a cylindrical shell, and both sides are sealed with non-toxic potting materials. The hollow fiber is sealed and fixed with the shell. The hollow fiber is opened outside the sealing layer, and the outer end is closed with end caps at both ends to form a first fluid channel, and the gap between the outer layer of the fiber bundle and the shell forms a second fluid channel.

During the processing of the membrane separation device, the sealing and fixation of the hollow fiber bundle and the shell is a key process in the processing of the membrane separation device. Since the potting glue will shrink to a certain extent when solidifying and sealing, in order to prevent the sealing part from generating large stress, Both ends of the shell need to be equipped with flexible sheets arranged in circumferential separation. The top part of the flexible sheet is embedded in the sealing layer to achieve sealing without causing large stress concentration. This design can be found in existing technologies such as CN101267873A.

Although the flexible sheets arranged in circumferential separation solve the stress problem, when the hollow fiber bundle is sealed with the shell, the non-toxic potting glue cannot hang well on the part to be sealed, that is, the potting glue has the risk of falling off, and the sealing The effect is poor and a series of problems such as high processing defective rate occur. Plasma treatment of the surface of the flexible sheet can reduce the risk of potting glue falling off, but this adds additional operations, increases the difficulty of product processing, and increases processing costs.

In order to reduce the resistance of the liquid and facilitate the potting glue to contact the flexible sheet more evenly, people often set the flexible sheet to have a smooth surface. The flexible sheet has a smooth surface, which is also beneficial to mold design and demoulding during production.

technical problem

The existing hollow fiber membrane separators have certain shortcomings and need further improvement.

Technical solutions

The object of the present invention is to overcome at least one shortcoming of the prior art and provide a shell structure and a hollow fiber membrane separator.

The technical solutions adopted by the present invention are:

A shell structure includes a cylindrical shell, and flexible sheets arranged in circumferential intervals are provided at both ends of the main body, and at least part of the flexible sheets is provided with a concave and convex structure.

In some examples of shell structures, the concave-convex structure has at least one of the following characteristics:

1) The height difference between the upper and lower surfaces of the concave-convex structure is greater than 0 and does not exceed 5mm;

2) Concave-convex structures are continuous grooves or protrusions forming threads;

3) The concave-convex structure is a structure of concave holes or convex points, arranged regularly or irregularly;

4) The concave-convex structure is a concave hole or convex point structure, and the center distance between adjacent concave holes or convex points is 1 to 20 mm;

5) The concave and convex structure is frosted;

6) The total area of the concave-convex structure is 10 to 60% of the total area of the flexible sheet;

7) Concave-convex structures are distributed on the surface and/or sides of the flexible sheet;

8) Concave-convex structures are distributed on at least one side of the flexible sheet;

9) The concave and convex structures are distributed on the free end of the flexible sheet.

In some examples of shell structures, the flexible sheet has at least one of the following characteristics:

1) The top of the flexible sheet is provided with bifurcation;

2) The width of the end of the flexible sheet close to the main body is greater than the width of the end away from the main body;

3) One end of the flexible sheet close to the main body has a smooth surface;

4) The distance between adjacent flexible sheets is 0 to 20 mm;

5) The total number of flexible pieces at one end is 15 to 20 pieces.

1) The distance between the bifurcations of the same flexible piece is 0 to 10 mm;

2) The length of the smooth surface shall not be less than 1/3 of the total length of the flexible sheet;

3) The total number of flexible sheets is 18.

In some examples of shell structures, the bifurcation has at least one of the following characteristics:

1) At least one side of the bifurcation is provided with the concave-convex structure;

2) The gap between the bifurcations is V-shaped;

3) Symmetrical distribution of bifurcations of the same flexible piece;

4) The width of the end of the bifurcation close to the cylindrical housing is greater than the width of the end far away from the cylindrical housing.

In some examples of shell structures, one end of the flexible sheet close to the main body has a smooth surface, and a bifurcation is provided at the top. The gap between the bifurcations is V-shaped, and the distance between adjacent flexible sheets is 0 to 20 mm. The total number of flexible sheets is 15-20; the concave-convex structure is a frosted surface, and the total area is 10-60% of the total area of the flexible sheets.

In some examples of shell structures, one end of the flexible piece close to the main body has a smooth surface, and a bifurcation is provided at the top. The gap between the bifurcations is V-shaped. The flexible pieces are evenly distributed, and the spacing between adjacent flexible pieces is is 0 to 10 mm, and the total number of flexible sheets at one end is 15 to 20; the concave and convex structure is a frosted surface, and the total area is 10 to 60% of the total area of the flexible sheets.

In some examples of shell structures, one end of the flexible piece close to the main body has a smooth surface, and a bifurcation is provided at the top. The gap between the bifurcations is V-shaped. The flexible pieces are evenly distributed, and the spacing between adjacent flexible pieces is is 0 to 10 mm, and the total number of flexible sheets at one end is 15 to 20; the concave and convex structure is a frosted surface, located on the surface of the bifurcation, and the total area is 10 to 60% of the total area of the flexible sheets.

In some examples of housing structures, the housing structures are made of thermoplastic.

In some examples of housing construction, the thermoplastic is polypropylene.

A second aspect of the invention provides:

A hollow fiber membrane separator includes a cylindrical shell, a hollow fiber bundle, a sealing layer and an end cover. The hollow fiber bundle is placed in the cylindrical shell and fixed with the cylindrical shell as a whole through potting glue. The structure of the cylindrical housing is as described in the first aspect of the present invention.

beneficial effects

The shell structure of some implementations of the present invention, through the special structural design of the top of the flexible sheet, greatly increases the contact area between the top of the flexible sheet and the potting glue, achieving good glue hanging, thereby improving the sealing effect between the fiber bundle and the shell, and reducing Defective rate.

The shell structure of some implementations of the present invention, by arranging a concave and convex structure with reasonable structure, allows the product to be easily demoulded, simple to process, and low in cost.

In some embodiments of the hollow fiber membrane separator of the present invention, the free end of the flexible sheet is provided with a concave and convex structure, which greatly increases the contact area between the top of the flexible sheet and the potting glue, thereby achieving good glue hanging, thereby improving the sealing between the fiber bundle and the shell. Effectively, reduce the defective rate. At the same time, the main fluid channel still has a smooth surface, which is beneficial to reducing fluid resistance.

In some implementations of the hollow fiber membrane separator of the present invention, by arranging concave and convex structures on both sides of the flexible sheet, it is possible to better ensure that the entire flexible body has a smooth surface, on the basis of ensuring good bonding force with the potting glue. It will not cause excessive resistance to the flow of liquid.

Description of the drawings

Figure 1 is a schematic diagram of the overall structure of some example housing structures of the present invention.

Figures 2 to 8 are schematic structural diagrams of flexible sheets in some examples of the present invention.

Figure 9 is a schematic diagram of the overall structure of some examples of hollow fiber membrane separators of the present invention.

Embodiments of the invention

Embodiments of the present invention are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions. The embodiments described below with reference to the drawings are exemplary and are only used to explain the present invention and are not to be construed as limitations of the present invention.

In the description of the present invention, it should be understood that orientation descriptions, such as up, down, front, back, left, right, etc., are based on the orientation or position relationships shown in the drawings and are only In order to facilitate the description of the present invention and simplify the description, it is not intended to indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be construed as a limitation of the present invention.

In the description of the present invention, several means one or more, plural means two or more, greater than, less than, more than, etc. are understood to exclude the original number, and above, below, within, etc. are understood to include the original number. If there is a description of first and second, it is only for the purpose of distinguishing technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of indicated technical features or implicitly indicating the order of indicated technical features. relation.

In addition, the terms “first” and “second” are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of indicated technical features. Thus, features defined as "first" and "second" may explicitly or implicitly include one or more features.

In the description of the present invention, it should be noted that, unless otherwise clearly stated and limited, the term "connection" should be understood in a broad sense. For example, it can be a fixed connection or a movable connection, or a detachable connection or a non-detachable connection. , or integrally connected; it can be mechanical connection, electrical connection or mutual communication; it can be directly connected, or it can be indirectly connected through an intermediate medium, it can be internal connection, indirect connection or two elements' internal connection. interactive relationship.

The following disclosure provides many different embodiments or examples for implementing different aspects of the invention.

Referring to Figures 1 to 8, a shell structure includes a cylindrical shell 1. Both ends of the main body 1 are provided with flexible sheets 2 arranged circumferentially. At least part of the flexible sheet 2 is provided with a concave and convex structure 3. .

In some examples of shell structures, the height difference between the upper and lower surfaces of the concave-convex structure is greater than 0 and does not exceed 5 mm. The data shows that under this height difference, the mold can be easily demoulded and prepared in one step, and the potting glue can also be well glued.

In some examples of shell structures, the concave and convex structures are continuous grooves or protrusions forming threads. This allows the potting glue to form threads within the concave and convex structure, resulting in a tighter combination.

In some examples of shell structures, the concave and convex structures are concave holes or convex point structures, arranged regularly or irregularly.

In some examples of shell structures, the concave and convex structures are concave holes or convex point structures, and the center distance between adjacent concave holes or convex points is 1 to 20 mm. The circle center distance can also be adjusted accordingly as needed, such as set to 1~15mm, 1~10mm, 2~15mm, 2~12mm, etc.

In some examples of shell structures, the concave and convex structures are frosted surfaces. This can increase the contact area between the potting glue and the flexible sheet. At the same time, the frosted surface is easy to prepare and can be demoulded at one time, which is beneficial to reducing production costs.

In some examples of shell structures, the total area of the concave-convex structure is 10-60% of the total area of the flexible sheet, preferably 20-60%, 30-60%.

In some examples of shell structures, the top end of the flexible sheet 2 is provided with a bifurcation 21 . By setting bifurcations, the top part of the flexible sheet can be more easily bent and deformed, which is more conducive to reducing the stress generated when the potting glue is cured.

In some examples of shell structures, the width of the end of the flexible sheet close to the main body is greater than the width of the end far away from the main body. The inclined design can facilitate the demoulding of the shell during injection molding and can also make the top part of the flexible sheet easier to bend. Deformation is more conducive to reducing the stress generated when the potting glue is cured.

The spacing of the flexible sheets can be adjusted accordingly according to the size of the cylindrical shell to meet the needs of shell structures of different sizes. In some examples of shell structures, the distance between the flexible sheets is 0 to 20 mm, 1 to 15 mm, or 1 to 10 mm.

In some examples of shell structures, the total number of flexible sheets at one end of the cylindrical shell 1 is 15 to 20, preferably 18. The data shows that 18 flexible sheets can ensure the mechanical strength of both ends of the shell, ensure that the shell will not deform when connected and sealed, and that the flexible sheets are not easy to break.

In some examples of shell structures, the distance between the bifurcations 21 of the same flexible sheet 2 is 0 to 10 mm.

In some examples of shell structures, the gaps between the bifurcations are V-shaped. The width of the end of the bifurcation close to the cylindrical housing is greater than the width of the end away from the cylindrical housing. This allows the bifurcation to bend better, reduces the deformation of the base flexible sheet, and obtains a potting structure with basically no stress accumulation.

In some examples of shell structures, at least one side of the bifurcation 21 is provided with the concave-convex structure 3 . In some examples of shell structures, the concave and convex structures 3 are distributed on at least one side of the flexible sheet 2 . This can not only increase the contact area between the potting glue and the concave-convex structure, but also reduce or even prevent the potting glue from further flowing to the lower end of the flexible sheet, which would adversely affect the flow of the liquid.

In some examples of shell structures, the concave-convex structures 3 are distributed on the surface and/or sides of the flexible sheet 2 .

In some examples of shell structures, one end of the flexible sheet close to the main body has a smooth surface. One end of the flexible sheet close to the main body forms a flow channel, which has a smooth surface, which is more conducive to reducing resistance to fluid flow and facilitating subsequent use.

The free end of the flexible sheet is the main curing area of the potting glue. In some examples of shell structures, the concave and convex structures are distributed on the free end of the flexible sheet. This can better hang the glue and prevent the potting glue from flowing down to the end of the cylindrical shell.

In some examples of housing construction, the thermoplastic is polypropylene.

The above technical features can be combined arbitrarily as long as they are not mutually exclusive.

实施例Example 11 ：:

A shell structure, including a cylindrical shell 1. The diameter of the cylindrical shell 1 is 32-44mm and the length is 250-280mm. Both ends of the main body 1 are provided with 18 flexible sheets 2 arranged circumferentially. , the length of the flexible sheet 2 is 10-40mm, the bottom width is 2-15mm, the flexible sheet is provided with a symmetrical bifurcation 21 at 1/2 position, the outer edge of the bifurcation 21 is provided with a concave-convex structure 3, the concave-convex structure 3 is arranged up and down The height difference between the surfaces is 0 to 3 mm.

Referring to Figure 9, a hollow fiber membrane separator includes a cylindrical shell 1, a hollow fiber bundle, a sealing layer and an end cover 4. The hollow fiber bundle is placed in the cylindrical shell 1 and connected to the cylinder through potting glue. The cylindrical casing 1 is fixed as a whole, and the structure of the cylindrical casing 1 is as described in the first aspect of the present invention.

The above is a further detailed description of the present invention and should not be regarded as a limitation on the specific implementation of the present invention. For those of ordinary skill in the technical field to which the present invention belongs, simple deductions or substitutions without departing from the concept of the present invention are all within the protection scope of the present invention.

Claims

A shell structure includes a cylindrical shell, and flexible sheets arranged in circumferential intervals are provided at both ends of the main body. It is characterized in that at least part of the flexible sheets is provided with a concave and convex structure.
The shell structure according to claim 1, wherein the concave-convex structure has at least one of the following characteristics:

The height difference between the upper and lower surfaces of the concave-convex structure is greater than 0 and does not exceed 5 mm;

Concave-convex structures are continuous grooves or protrusions forming threads;

The concave-convex structure is a structure of concave holes or convex points, arranged regularly or irregularly;

The concave-convex structure is a concave hole or convex point structure, and the center distance between adjacent concave holes or convex points is 1 to 20 mm;

The concave and convex structure is frosted;

The total area of the concave-convex structure is 10 to 60% of the total area of the flexible sheet;

Concave-convex structures are distributed on the surface and/or sides of the flexible sheet;

Concave-convex structures are distributed on at least one side of the flexible sheet;

The concave and convex structures are distributed on the free end of the flexible sheet.
The shell structure according to claim 1, wherein the flexible sheet has at least one of the following characteristics:

The top of the flexible sheet is provided with bifurcation;

The width of the end of the flexible sheet close to the main body is greater than the width of the end away from the main body;

One end of the flexible sheet close to the main body has a smooth surface;

The distance between adjacent flexible sheets is 0 to 20 mm;

The total number of flexible pieces at one end is 15 to 20 pieces.
The shell structure according to claim 3, wherein the flexible sheet has at least one of the following characteristics:

The distance between the bifurcations of the same flexible piece is 0 to 10 mm;

The length of the smooth surface shall not be less than 1/3 of the total length of the flexible sheet;

The total number of flexible sheets is 18.
The shell structure according to claim 3 or 4, characterized in that the bifurcation has at least one of the following characteristics:

At least one side of the bifurcation is provided with the concave-convex structure;

The gap between the bifurcations is V-shaped;

Symmetrical distribution of bifurcations of the same flexible piece;

The width of the end of the bifurcation close to the cylindrical housing is greater than the width of the end far away from the cylindrical housing.
The shell structure according to claim 1, characterized in that one end of the flexible piece close to the main body has a smooth surface, and a bifurcation is provided at the top. The gap between the bifurcations is V-shaped, and the distance between adjacent flexible pieces is 0～20 mm, the total number of flexible pieces at one end is 15～20 pieces;

The concave-convex structure is a frosted surface, and the total area is 10-60% of the total area of the flexible sheet.
The shell structure according to claim 6, wherein the flexible pieces are evenly distributed, and the distance between adjacent flexible pieces is 0 to 10 mm.
The shell structure according to claim 6 or 7, characterized in that the concave and convex structures are located on the surface of the bifurcation.
The housing structure according to any one of claims 1 to 8, characterized in that the housing structure is made of thermoplastic plastic.
A hollow fiber membrane separator, including a cylindrical shell, a hollow fiber bundle, a sealing layer and an end cover, characterized in that the hollow fiber bundle is placed in the cylindrical shell and fixed with the cylindrical shell through potting glue Integrated, the structure of the cylindrical shell is as described in any one of claims 1 to 9.