A series of replaceable silicon carbide column ultrafiltration membrane group

Abstract

The present invention discloses a silicon carbide column ultrafiltration membrane group with a replaceable membrane core in series, comprising a membrane shell, wherein a plurality of membrane core assemblies are detachably arranged in the membrane shell; the sides of the membrane core assembly near both ends are sealed with the membrane shell by sealing rings; and a plurality of membrane core assemblies are connected in series through a central connecting pipe. The membrane core of the present invention is replaceable, easy to maintain, and has low manufacturing and operating costs; a plurality of membrane cores are arranged in series, which increases the filtration area, and the membrane core has a high porosity and a large flux; the membrane core has high strength, good wear resistance, and a long service life; the thermal stability and chemical stability are improved, and the scope of use is wide.

Description

Technical Field

[0001] The invention relates to a silicon carbide column ultrafiltration membrane, in particular to a silicon carbide column ultrafiltration membrane group with a serially connected replaceable membrane core, belonging to the technical field of filtration. Background Art

[0002] Ultrafiltration membrane groups are used in reverse osmosis pretreatment, drinking water treatment, reclaimed water reuse and other fields. Compared with MBR membrane groups, they have greater filling density, higher recovery rate and better produced water quality.

[0003] At present, the conventional filtration method of column ultrafiltration membrane is generally external pressure type. The membrane core is composed of hollow organic membrane filaments. Usually, both ends of the organic membrane filaments are fixed in the PVC shell with glue, and head covers are fixed at both ends of the PVC shell. The water inlet and water outlet are generally interfaces set on the side of the head cover, and the concentrate outlet is generally an interface set on the axial centerline of the end face of the head cover.

[0004] For example, Chinese invention patent CN200920208459.5 discloses a columnar hollow fiber ultrafiltration membrane assembly with a stepped end structure, including a pressure-bearing housing, with ends at both ends of the outer side of the pressure-bearing housing, and the ends are connected to end caps; an ultrafiltration membrane is arranged inside the pressure-bearing housing, and sealants are arranged on both sides of the ultrafiltration membrane, and the top of the end has a stepped structure, which protrudes from the top surface of the sealant, and a micro water storage tank is formed between the stepped structure and the top surface of the sealant. The advantage of this invention is that the end can be installed conveniently and accurately, so that it can be closely matched with the pressure-bearing housing, and a small amount of water can be stored in the micro water storage tank, making the detection work more intuitive and simple.

[0005] The column ultrafiltration membrane of the above invention patent structure has the following deficiencies in actual use:

[0006] 1. Organic membrane wire has low strength, is easy to break, and has a short service life.

[0007] 2. Poor thermal stability, cannot operate in high temperature water; poor chemical stability, not suitable for use in some acids, alkalis, organic solvents and oxidants, and limited scope of use.

[0008] 3. The membrane core needs to be glued to the membrane shell and cannot be replaced, making maintenance difficult and increasing manufacturing and operating costs.

[0009] 4. The filtration area is limited, the flux is small, and the flux of a single membrane is fixed. When the flux is large, the membrane group is assembled, which requires high manufacturing cost and large installation space.

[0010] In summary, the prior art obviously has inconveniences and defects in practical use, so it is necessary to improve it. Summary of the invention

[0011] The technical problem to be solved by the present invention is to provide a silicon carbide column ultrafiltration membrane group with a series-connected replaceable membrane core in view of the above shortcomings, which can achieve the following purposes:

[0012] 1. The membrane core is replaceable, easy to maintain, and has low manufacturing and operating costs;

[0013] 2. Multiple membrane cores are connected in series to increase the filtration area, and the membrane core has high porosity and large flux;

[0014] 3. The membrane core has high strength, good wear resistance and long service life;

[0015] 4. Improved thermal stability and chemical stability, wide range of applications.

[0016] In order to solve the above technical problems, the present invention adopts the following technical scheme: a silicon carbide column ultrafiltration membrane group with a serially replaceable membrane core, comprising a membrane shell, in which a plurality of membrane core assemblies are detachably arranged; sealing rings are used to seal the side surfaces of the membrane core assembly adjacent to both ends and the membrane shell; and a plurality of membrane core assemblies are connected in series through a central connecting pipe.

[0017] Furthermore, the membrane core assembly includes a plurality of membrane blocks, which are arranged circumferentially to form a cylindrical structure with a central circular hole; a first gap is left between two adjacent membrane blocks; the plurality of cylindrical membrane blocks are arranged in the shell, and a second gap is formed between the outer circumferential surfaces of the plurality of membrane blocks and the shell;

[0018] The two ends of the membrane block are sleeved with rubber supporting plates near the ends, and the skeleton of the rubber supporting plates is filled in the first gap and the second gap; the first gap and the second gap between the ends of the membrane block and the rubber supporting plates are sealed with sealant.

[0019] Furthermore, the first slit, the second slit, and the central circular holes formed by the plurality of membrane blocks are interconnected to form a flow channel for clean water to seep out of each membrane block.

[0020] Furthermore, the membrane block is a columnar structure of silicon carbide material, and the cross-section of the membrane block is fan-shaped; a plurality of through holes are evenly arranged in the membrane block along the length direction; and the through holes of the plurality of membrane blocks are distributed in a honeycomb shape.

[0021] Furthermore, the two ends of the shell are sealed with a head, the head is a hollow cylindrical structure, the inner cavity of the head is sealed with a reinforcing sleeve, the reinforcing sleeve is a circular frame structure, and the reinforcing sleeve is provided with a fan-shaped hole corresponding to the position of each membrane block;

[0022] The reinforcing sleeve center sleeve is provided with a center pipe; the center pipe is inserted into the center circular hole formed by the membrane block and passes through the rubber supporting plate; the connection between the center pipe and the inner side of the membrane block is sealed with sealant.

[0023] Furthermore, the membrane shell is a hollow cylindrical structure, and the material of the membrane shell is fiberglass; the sides of the membrane shell close to both ends are respectively provided with a first side water outlet and a second side water outlet; and a central water pipe is provided at the center of the end faces of both ends of the membrane shell.

[0024] Furthermore, the first side water outlet is connected to the corresponding membrane shell inner cavity as a first water chamber, and the second side water outlet is connected to the corresponding membrane shell inner cavity as a second water chamber; both the first water chamber and the second water chamber are provided with spacers, and the spacers include two upper and lower circular rings and a plurality of oblique ribs connecting the two circular rings; the diameter of the upper circular ring is smaller than the diameter of the lower circular ring.

[0025] Furthermore, the bottom end of the spacer sleeve is in conflict with the end of the membrane core assembly; the top end of the spacer sleeve is in conflict with the end cover, and the end cover is detachably fixed in the membrane shell; a central water pipe is provided in the center of the end cover, and the central water pipe passes through the spacer sleeve and is plugged and fixed with a plug, and the plug is plugged and fixed in a central connecting pipe; sealing rings are used between the plug and the central water pipe, and between the plug and the central connecting pipe.

[0026] Furthermore, the two ends of the central connecting pipe are respectively plugged and fixed in the central connecting pipes of two adjacent membrane core assemblies;

[0027] The water production chamber is between the two ends of the glue seals of the multiple membrane blocks; the transition water chamber is between the glue seal end of one membrane core assembly and the glue seal end of the adjacent membrane core assembly.

[0028] Furthermore, the rubber supporting plate is a circular structure, and is provided with a plurality of through holes through which the membrane block passes; the shape of the through holes is the same as the cross-sectional shape of the membrane block.

[0029] After adopting the above technical solution, the present invention has the following advantages compared with the prior art:

[0030] 1. The membrane core and the membrane shell of the present invention are not sealed as one, but are detachably fixed in the membrane shell and sealed by a sealing ring, and can be disassembled and replaced, which is convenient for maintenance and has low manufacturing and operating costs.

[0031] 2. The multiple membrane core components of the present invention are arranged in series, which increases the filtration area, and the through holes on the membrane core components are distributed in a honeycomb shape, with high porosity and large flux.

[0032] 3. The membrane core of the present invention comprises a plurality of column structures of silicon carbide material, which has good wear resistance and long service life.

[0033] 4. The membrane core of the present invention adopts silicon carbide material, which improves thermal stability and chemical stability, has a wide range of applications, and can be used in various acid, alkali, organic solvent, oxidant, high temperature and other environments.

[0034] The present invention is described in detail below with reference to the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a schematic diagram of the structure of the present invention;

[0036] Figure 2 yes Figure 1 Enlarged view of point A in the middle;

[0037] Figure 3 yes Figure 1 Enlarged view of point B in the middle;

[0038] Figure 4 is a three-dimensional schematic diagram of the end portion of the present invention (without the membrane shell);

[0039] Figure 5 It is a schematic diagram of the structure of the membrane core assembly;

[0040] Figure 6 It is a three-dimensional diagram of the membrane core assembly;

[0041] Figure 7 yes Figure 5 Enlarged view of point C in the middle;

[0042] Figure 8 It is a schematic diagram of the membrane block arrangement;

[0043] Fig. 9 It is a top view of the rubber support board;

[0044] In the figure,

[0045] 1-membrane shell, 2-membrane core assembly, 21-membrane block, 22-head, 23-shell, 24-rubber support plate, 25-center pipe, 26-through hole, 27-through hole, 28-first gap, 29-second gap, 210-reinforcement sleeve, 3-first side water outlet, 4-second side water outlet, 5-center water pipe, 6-end cover, 7-spacer, 8-center connecting pipe, 9-first water chamber, 10-water production chamber, 11-second water chamber, 12-transition water chamber, 13-insertion pipe. DETAILED DESCRIPTION

[0046] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, specific embodiments of the present invention are now described with reference to the accompanying drawings.

[0047] Example 1

[0048] like Figure 1-9 As shown together, the present invention provides a silicon carbide column ultrafiltration membrane group with a series-type replaceable membrane core, including a membrane shell 1 and a plurality of membrane core assemblies 2 arranged in the membrane shell 1; the plurality of membrane core assemblies are connected end to end to form a series mode; in this embodiment, the number of membrane core assemblies 2 is two.

[0049] The membrane shell 1 is a hollow cylindrical structure, and the material of the membrane shell 1 is glass fiber reinforced plastic; the sides of the membrane shell 1 close to both ends are respectively provided with a first side water outlet 3 and a second side water outlet 4.

[0050] The membrane core assembly 2 is cylindrical and can be detachably installed in the membrane shell 1. A sealing ring is used to seal between the side of the membrane core assembly 2 near the top and the membrane shell, and between the side of the membrane core assembly 2 near the bottom and the membrane shell. The sealing ring is a rubber sealing ring.

[0051] The membrane core assembly 2 includes a plurality of membrane blocks 21, the membrane blocks 21 are made of silicon carbide, the membrane blocks 21 are columnar structures, and the cross-section of the membrane blocks 21 is fan-shaped; a plurality of through holes 26 are evenly arranged in the membrane blocks 21 along the length direction, and the diameter of the through holes 26 is about 2.5 mm; the through holes 26 of the plurality of membrane blocks 21 are distributed in a honeycomb shape, with high porosity and large flux.

[0052] The multiple membrane blocks 21 are arranged circumferentially to form a cylindrical structure with a central circular hole. A first gap 28 is left between two adjacent membrane blocks 21 , and the first gap 28 is interconnected with the central circular hole formed by the multiple membrane blocks 21 .

[0053] A plurality of cylindrical membrane blocks 21 are arranged in a shell 23, and the shell 23 is a hollow cylindrical structure with openings at both ends. A second gap 29 is formed between the outer circumferential surfaces of the plurality of membrane blocks 21 and the shell 23, and the second gap 29 is connected to the first gap 28; the central circular hole formed by the plurality of membrane blocks 21, the first gap 28 and the second gap 29 are flow channels for clean water to seep out of each membrane block 21.

[0054] Rubber support plates 24 are sleeved near the ends of both ends of the membrane block 21. The rubber support plates 24 are circular in structure and are provided with a plurality of through holes 27 through which the membrane block 21 passes. The shape of the through holes 27 is the same as the cross-sectional shape of the membrane block 21, both of which are fan-shaped.

[0055] The frame of the rubber supporting plate 24 is filled in the first gap 28 and the second gap 29; the first gap 28 and the second gap 29 between the end of the membrane block 21 and the rubber supporting plate 24 are sealed with sealant.

[0056] The two ends of the multiple membrane blocks 21 sealed with glue form a water production chamber 10 , in which raw water is filtered through the membrane blocks 21 to produce clean water.

[0057] The two ends of the shell 23 are sealed with a head 22, which is a hollow cylindrical structure. A reinforcing sleeve 210 is fixed in the inner cavity of the head 22, and the head 22 and the side connection of the reinforcing sleeve 210 are fixed with sealant; the reinforcing sleeve 210 is a circular frame structure, and the reinforcing sleeve 210 is provided with fan-shaped holes corresponding to the position of each membrane block 21 to facilitate water flow into the membrane block 21; a central sleeve of the reinforcing sleeve 210 is provided with a central connecting pipe 25; the central connecting pipe 25 is inserted into the central circular hole formed by the membrane block 21 and passes through the rubber supporting plate 24; the connection between the central connecting pipe 25 and the inner side of the membrane block 21 is sealed with sealant.

[0058] The first side water inlet 3 is connected to the corresponding inner cavity of the membrane shell 1 to form a first water chamber 9, and the second side water inlet 4 is connected to the corresponding inner cavity of the membrane shell 1 to form a second water chamber 11; a spacer 7 is provided in each of the first water chamber 9 and the second water chamber 11, and the spacer 7 includes two upper and lower circular rings and a plurality of inclined ribs connecting the two circular rings; the diameter of the upper circular ring is smaller than the diameter of the lower circular ring, and the plurality of inclined ribs are inclined inwardly, so that the spacer 7 forms a cone.

[0059] The bottom end of the spacer 7 contacts the end of the membrane core assembly 2 to prevent the membrane core assembly 2 from axial movement;

[0060] The top end of the spacer sleeve 7 is in conflict with the end cover 6, and the end cover 6 is detachably fixed in the membrane shell 1, and the end cover 6 is fixed to the membrane shell 1 by clamping or bolting; a central water pipe 5 is arranged at the center of the end cover 6, and the central water pipe 5 passes through the spacer sleeve 7 and is plugged and fixed with the insert pipe 13, and the insert pipe 13 is plugged and fixed in the central connecting pipe 25; sealing rings are used to seal between the insert pipe 13 and the central water pipe 5, and between the insert pipe 13 and the central connecting pipe 25.

[0061] Two adjacent membrane core assemblies 2 are connected via a central connecting pipe 8 , and two ends of the central connecting pipe 8 are respectively inserted and fixed in the central connecting pipes 25 of the two membrane core assemblies 2 , so that the two membrane core assemblies 2 are connected in series.

[0062] A transition water chamber 12 is formed between the glue-sealed end of one membrane core assembly 2 and the glue-sealed end of an adjacent membrane core assembly 2 . The filtered raw water in one membrane core assembly 2 passes through the transition water chamber 12 and enters the membrane core assembly 2 connected in series with it for further filtration.

[0063] Working principle of the present invention:

[0064] When in use, raw water enters the first water chamber through the first side water inlet, or enters the second water chamber from the second side water inlet, and then enters the series-connected membrane core components in turn for filtration. Specifically, the raw water enters the through holes of each membrane block, and under the action of pressure, small molecules or liquids seep to the outside of the membrane block and finally flow out through the central water pipe; large molecules or solids are intercepted in the membrane block, and finally enter the second water chamber and flow out through the second side water inlet, or enter the first water chamber and flow out through the first side water inlet.

[0065] In actual use, the unused end of the center water pipe can be blocked with a plug.

[0066] The membrane shell and the membrane core of the present invention are not sealed as one body by glue, but are sealed by a sealing ring, and can be disassembled and replaced, which is convenient for maintenance and has low manufacturing and operating costs.

[0067] The multiple membrane core components of the present invention are arranged in series, which increases the filtering area, and the through holes on the membrane core components are distributed in a honeycomb shape, with high porosity and large flux.

[0068] The membrane core of the present invention comprises a plurality of column structures made of silicon carbide material, has good wear resistance and long service life.

[0069] The membrane core of the present invention adopts silicon carbide material, which improves thermal stability and chemical stability, has a wide range of applications, and can be suitable for various acid and alkali, organic solvent, oxidant, high temperature and other environments.

[0070] The above is an example of the best implementation of the present invention, and the parts not described in detail are common knowledge of ordinary technicians in the field. The protection scope of the present invention shall be based on the content of the claims, and any equivalent transformation based on the technical enlightenment of the present invention is also within the protection scope of the present invention.

Claims

1. A series-connected silicon carbide column ultrafiltration membrane group with replaceable membrane core, characterized in that: It comprises a membrane shell (1), wherein a plurality of membrane core assemblies (2) are detachably arranged in the membrane shell (1); the sides of the membrane core assembly (2) adjacent to both ends are sealed with the membrane shell (1) by means of sealing rings; and the plurality of membrane core assemblies (2) are connected in series via a central connecting pipe (8); The membrane core assembly (2) comprises a plurality of membrane blocks (21), wherein the plurality of membrane blocks (21) are arranged circumferentially to form a cylindrical structure with a central circular hole; a first gap (28) is left between two adjacent membrane blocks (21); the plurality of cylindrical membrane blocks (21) are arranged in a shell (23), and a second gap (29) is formed between the outer circumferential surfaces of the plurality of membrane blocks (21) and the shell (23); The membrane block (21) is a columnar structure made of silicon carbide material; The membrane shell (1) is provided with a first side water outlet (3) and a second side water outlet (4) at the sides close to the two ends respectively; The first side water inlet (3) is connected to the corresponding inner cavity of the membrane shell (1) to form a first water chamber (9), and the second side water inlet (4) is connected to the corresponding inner cavity of the membrane shell (1) to form a second water chamber (11); a spacer (7) is provided in each of the first water chamber (9) and the second water chamber (11), and the spacer (7) comprises two upper and lower circular rings and a plurality of oblique ribs connecting the two circular rings; the diameter of the upper circular ring is smaller than the diameter of the lower circular ring; The bottom end of the spacer (7) contacts the end of the membrane core assembly (2); and the top end of the spacer (7) contacts the end cover (6).

2. A silicon carbide column ultrafiltration membrane group with a serially replaceable membrane core as claimed in claim 1, characterized in that: A rubber support plate (24) is sleeved at positions near the ends of both ends of the membrane block (21), and the frame of the rubber support plate (24) is filled in the first gap (28) and the second gap (29); the first gap (28) and the second gap (29) between the end of the membrane block (21) and the rubber support plate (24) are sealed with a sealant.

3. A series-connected replaceable silicon carbide column ultrafiltration membrane group according to claim 2, characterized in that: The first slit (28), the second slit (29), and the central circular holes formed by the plurality of membrane blocks (21) are interconnected to form a circulation channel for clean water to seep out of each membrane block (21).

4. The silicon carbide column ultrafiltration membrane group with a serially replaceable membrane core as claimed in claim 2, characterized in that: The cross section of the membrane block (21) is fan-shaped; a plurality of through holes (26) are evenly arranged in the membrane block (21) along the length direction; and the through holes (26) of the plurality of membrane blocks (21) are distributed in a honeycomb shape.

5. The silicon carbide column type ultrafiltration membrane group with a serially replaceable membrane core as claimed in claim 2, characterized in that: The two ends of the shell (23) are sealed with a sealing head (22), the sealing head (22) is a hollow cylindrical structure, the inner cavity of the sealing head (22) is sealed with a reinforcing sleeve (210), the reinforcing sleeve (210) is a circular frame structure, and the reinforcing sleeve (210) is provided with a fan-shaped hole at a position corresponding to each membrane block (21); The reinforcing sleeve (210) is provided with a central pipe (25) at the center thereof; the central pipe (25) is inserted into the central circular hole formed by the membrane block (21) and passes through the rubber supporting plate (24); and the connection between the central pipe (25) and the inner side surface of the membrane block (21) is sealed with a sealant.

6. A series-connected silicon carbide column ultrafiltration membrane group with replaceable membrane core as claimed in claim 5, characterized in that: The membrane shell (1) is a hollow cylindrical structure, and the material of the membrane shell (1) is glass fiber reinforced plastic; a central water pipe (5) is provided at the center of the end surfaces at both ends of the membrane shell (1).

7. The silicon carbide column ultrafiltration membrane group with a serially replaceable membrane core as claimed in claim 5, characterized in that: The end cover (6) is detachably fixed in the membrane shell (1); a central water pipe (5) is provided at the center of the end cover (6); the central water pipe (5) passes through the spacer (7) and is plugged and fixed to the insert pipe (13); the insert pipe (13) is plugged and fixed in the central connecting pipe (25); sealing rings are used to seal between the insert pipe (13) and the central water pipe (5) and between the insert pipe (13) and the central connecting pipe (25).

8. The silicon carbide column ultrafiltration membrane group with a serially replaceable membrane core as claimed in claim 5, characterized in that: The two ends of the central connecting pipe (8) are respectively inserted and fixed in the central connecting pipes (25) of two adjacent membrane core assemblies (2); A water production chamber (10) is formed between the two ends of the glue seal of the plurality of membrane blocks (21); and a transition water chamber (12) is formed between the glue seal end of one membrane core assembly (2) and the glue seal end of an adjacent membrane core assembly (2).

9. The silicon carbide column ultrafiltration membrane group with a serially replaceable membrane core as claimed in claim 2, characterized in that: The rubber support plate (24) is a circular structure, and is provided with a plurality of through holes (27) through which the membrane block (21) passes; the shape of the through holes (27) is the same as the cross-sectional shape of the membrane block (21).

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