High-flux flat ceramic membrane and water treatment device

Abstract

The utility model relates to the technical field of ceramic membranes, in particular to a high-flux flat plate ceramic membrane and a water treatment device, the flat plate ceramic membrane comprises a membrane sheet provided with a plurality of membrane holes, a support column is formed between the side walls of the adjacent membrane holes, and a support wall is formed between the side wall of each membrane hole and the outer surface of the membrane sheet. The width of each supporting column is the same as the thickness of each supporting wall. The flat plate ceramic membrane disclosed by the utility model aims to solve the problem that the high flux and the uniformity of the wall thickness of an opening cannot be balanced by the conventional flat plate ceramic membrane, and can greatly improve the uniformity of the opening and the uniformity of the wall thickness of the flat plate ceramic membrane while keeping the high flux; the phenomena of leakage holes in blank making and warping, breakage and the like in the sintering process are avoided, the high flux of the flat plate ceramic membrane is guaranteed, and the overall strength of the flat plate ceramic membrane is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of ceramic membranes, and more specifically, to a high-flux flat ceramic membrane and a water treatment device. Background Art

[0002] In water resource purification, municipal water supply, drainage and other projects, ceramic membranes are widely used to purify water resources. Ceramic membranes are an efficient separation technology that plays an important role in water purification. Ceramic membranes have many advantages such as high separation efficiency, stable effect, good chemical stability, acid and alkali resistance, organic solvent resistance, bacteria resistance, high temperature resistance, and pollution resistance. They have been successfully used in many fields such as food, beverages, plant and drug deep processing, biomedicine, fermentation, and fine chemicals. They can be used for separation, clarification, purification, concentration, sterilization, and desalination in the process. For the field of water treatment, due to the narrow pore size distribution and high separation efficiency of ceramic membranes, they can effectively remove particles or molecules of a specific size, so they can improve the quality of sewage treatment. The separation performance of ceramic membranes is better than that of ultrafiltration and microfiltration, and they can effectively remove divalent and multivalent ions, and have a good separation effect on low molecular weight organic matter and salts.

[0003] Ceramic membranes are divided into two types: tubular ceramic membranes and flat ceramic membranes. Existing flat ceramic membranes generally adopt a single-layer porous structure, and the shapes of the holes are various, such as square, rectangular, triangular, circular, etc. For example, a Chinese patent document discloses a high-throughput flat ceramic membrane and a water treatment device, whose single-layer flow hole layer is composed of multiple equilateral triangular prism-shaped flow channels. Another example is that a Chinese patent document discloses a hollow structure flat ceramic membrane, whose single-layer flow hole layer is formed by UV-shaped water channels. The single-layer flow hole can achieve filtering, but its flow area is greatly affected by the hole. The flow area is different for different shapes of the flow hole, so a double-layer flow hole layer flat ceramic membrane appears. Although the double-layer flow hole layer flat ceramic membrane can greatly improve the flow rate and flow area of ​​the water collection, the layout of the double-layer flow hole layer is prone to uneven thickness at both ends of the ceramic membrane or at the intersection of the hole layers due to the interlacing or arrangement of the hole layers.

[0004] Although adding multiple layers of flow holes can increase the flow area and improve the flow flux, the flat ceramic membrane is very prone to warping and cracking during the sintering process. At the same time, the membrane is also prone to breakage and corner loss during transportation and installation. Utility Model Content

[0005] The purpose of the utility model is to overcome the problem that the current flat ceramic membrane cannot balance high flux and uniformity of opening wall thickness, and to provide a high-flux flat ceramic membrane and water treatment device. The flat ceramic membrane of the utility model can greatly improve the uniformity of opening and wall thickness of the flat ceramic membrane while maintaining high flux, avoid leakage holes in the blank making and warping and fracture during sintering, ensure the high flux of the flat ceramic membrane and improve the overall strength of the flat ceramic membrane.

[0006] In order to solve the above technical problems, the technical solution adopted by the utility model is:

[0007] A high-flux flat ceramic membrane comprises a membrane with a plurality of membrane holes, support columns are formed between the side walls of adjacent membrane holes, support walls are formed between the side walls of the membrane holes and the outer surface of the membrane, and the width of the support columns and the thickness of the support walls are the same at all locations.

[0008] Furthermore, the membrane holes include regular hexagonal holes and first special-shaped holes that pass through both ends of the membrane and are alternately arranged in a single row at equal intervals, and the opposite sides between adjacent regular hexagonal holes and first special-shaped holes are parallel to each other. The membrane holes also include second special-shaped holes that pass through both ends of the membrane and are located on two symmetrical sides of the membrane, and the opposite sides between the second special-shaped holes and adjacent regular hexagonal holes or first special-shaped holes are parallel to each other.

[0009] Firstly, the utility model uses regular hexagonal holes as the main flow holes of the diaphragm. According to research, under the condition of equal wall thickness and cross-section, the water flow rates per unit area of ​​different hole types are: 46.68% for regular hexagonal holes, 44.63% for triangular holes, and 41.96% for circular holes. The water outlet cross-sectional area of ​​regular hexagonal holes is more advantageous than that of circular and triangular holes. Therefore, the utility model uses regular hexagonal holes as the main flow holes of the diaphragm, which can ensure the high flow flux of the utility model. Secondly, the first special-shaped holes are arranged between adjacent regular hexagonal holes to balance the wall thickness difference caused by the shapes between adjacent regular hexagonal holes, and balance the opening rate per unit area of ​​the diaphragm, so that the thickness of the support column formed between the side walls of adjacent membrane holes remains consistent. The second special-shaped holes are arranged on the symmetrical sides of the diaphragm. Balance the wall thickness difference caused by the shape between the second special-shaped hole and the adjacent regular hexagonal hole or the first special-shaped hole; the utility model arranges the first special-shaped hole in the gap between the adjacent regular hexagonal holes, and arranges the second special-shaped hole between the side of the diaphragm and the adjacent regular hexagonal holes or the first special-shaped holes, which can effectively balance the opening rate of the overall structure of the diaphragm while ensuring high flow flux. When the width of the support column and the thickness of the support wall are the same, the uniformity of the opening and the wall thickness of the flat ceramic membrane can be greatly improved, and the leakage phenomenon in the blank making can be avoided, and the warping and fracture in the sintering process can be avoided, thereby ensuring the high flux of the flat ceramic membrane and improving the overall strength of the flat ceramic membrane. At the same time, the finished product is not easy to be knocked, chipped or fractured during transportation and installation.

[0010] Furthermore, the support column includes a first support column formed between the adjacent regular hexagonal holes and the side walls opposite to the first special-shaped hole, and a second support column formed between the second special-shaped hole and the adjacent regular hexagonal hole or the side wall opposite to the first special-shaped hole; the width of the first support column is the same as the width of the second support column. Due to the division of the diaphragm body by the regular hexagonal holes, the first special-shaped holes and the second special-shaped holes, the structure between the adjacent diaphragm holes forms a support structure for supporting the diaphragm to prevent collapse and splitting. Due to the coordination between different diaphragm holes, the support structure forms a connecting column that is segmented and tortuous in the vertical and horizontal directions, which improves the thickness balance of the diaphragm and also improves the folding resistance and bending resistance of the diaphragm.

[0011] Furthermore, the side walls of the regular hexagonal hole, the first special-shaped hole and the second special-shaped hole respectively form support walls with the outer side wall of the diaphragm.

[0012] As a preferred solution, the first special-shaped hole is composed of two isosceles trapezoidal holes with parallel top sides that are connected to each other, and the hypotenuse of the isosceles trapezoidal hole is equal to the length of any side of the regular hexagonal hole.

[0013] This structural scheme enables the flat ceramic membrane to form a single layer of flow holes that are tightly and evenly arranged. The regular hexagonal holes cooperate with the first special-shaped holes and the second special-shaped holes to meet sufficient flow area, while the wall thickness and support column thickness are uniform.

[0014] As another preferred solution, the first special-shaped hole is composed of two isosceles trapezoidal holes with parallel and opposite top edges, and a reinforcing rib is formed between the two opposite top edges.

[0015] Furthermore, the width of the reinforcing rib is less than or equal to the width of the supporting column.

[0016] This solution configures the first special-shaped hole into a partition-type double-layer flow hole structure, which, in conjunction with the regular hexagonal hole and the second special-shaped hole, forms a combination of single-layer and double-layer water channel holes. Compared with a pure single-layer hole structure, reinforcing ribs are formed between the two opposite top edges to improve the overall strength of the diaphragm and reduce the risk of porcelain chipping, corner loss and breakage during transportation and installation.

[0017] Furthermore, the symmetrical side of the diaphragm is an arc-shaped transition arc edge, and the side of the second special-shaped hole adjacent to the transition arc edge is also an arc-shaped. The arc-shaped transition edge is not easy to be knocked off during transportation and installation, which can increase the service life. The side of the second special-shaped hole adjacent to the transition arc edge is also set to an arc shape, so that the thickness of the support wall on this side is balanced.

[0018] Furthermore, the diaphragm is in the shape of a rectangular flat plate.

[0019] Furthermore, the diaphragm is a non-metallic material diaphragm. It should be noted that the non-metallic material diaphragm includes but is not limited to an aluminum oxide diaphragm, a silicon dioxide diaphragm or a silicon carbide diaphragm.

[0020] The utility model also provides a water treatment device, comprising the high-flux flat ceramic membrane as described above.

[0021] Compared with the prior art, the beneficial effects of the utility model are:

[0022] The utility model can effectively balance the opening rate of the overall structure of the diaphragm by arranging the first special-shaped holes in random intervals between adjacent regular hexagonal holes and arranging the second special-shaped holes on the side of the diaphragm and between the adjacent regular hexagonal holes or the first special-shaped holes. When the width of the support column and the thickness of the support wall are the same, the regular hexagonal holes can greatly improve the uniformity of the opening and the uniformity of the wall thickness of the flat ceramic membrane while maintaining high flux, avoid leakage in the blank making, avoid warping and fracture in the sintering process, ensure the high flux of the flat ceramic membrane and improve the overall strength of the flat ceramic membrane. At the same time, the finished product is not easy to be knocked, chipped or fractured during transportation and installation. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0024] Figure 2 This is a schematic structural diagram of one of the membrane hole arrangements in Example 1 of the utility model;

[0025] Figure 3 This is a schematic structural diagram of another membrane hole arrangement in Example 1 of the utility model;

[0026] Figure 4 It is a structural schematic diagram of the membrane hole arrangement in Example 2 of the utility model.

[0027] The illustrations are as follows:

[0028] 1-diaphragm, 21-regular hexagonal hole, 22-first special-shaped hole, 221-reinforcement rib, 23-second special-shaped hole, 3-support column, 31-first support column, 32-second support column, 4-support wall. DETAILED DESCRIPTION

[0029] The utility model is further described below in conjunction with specific implementation methods. The drawings are only used for exemplary descriptions, and are only schematic diagrams, not actual pictures, and cannot be understood as limitations on this patent; in order to better illustrate the embodiments of the utility model, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted.

[0030] The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the drawings, it is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and cannot be understood as limitations on this patent. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0031] Example 1

[0032] like Figure 1 As shown, a high-flux flat ceramic membrane includes a diaphragm 1 with a plurality of membrane holes, support columns 3 are formed between the side walls of adjacent membrane holes, support walls 4 are formed between the side walls of the membrane holes and the outer surface of the diaphragm 1, and the width of the support columns 3 and the thickness of the support wall 4 are the same at all locations.

[0033] like Figure 2 and Figure 3 As shown, the membrane holes include regular hexagonal holes 21 and first special-shaped holes 22 that pass through both ends of the membrane 1 and are alternately arranged in a single row at equal intervals, and the opposite sides between adjacent regular hexagonal holes 21 and first special-shaped holes 22 are parallel to each other. The membrane holes also include second special-shaped holes 23 that pass through both ends of the membrane 1 and are located on two symmetrical sides of the membrane 1, and the opposite sides between the second special-shaped holes 23 and adjacent regular hexagonal holes 21 or first special-shaped holes 22 are parallel to each other.

[0034] In this embodiment, the arrangement and shape of the regular hexagonal hole 21, the first special-shaped hole 22 and the second special-shaped hole 23 include but are not limited to the following: Figure 2 to Figure 3 Two styles are shown.

[0035] like Figure 2 and Figure 3 As shown, the support column 3 includes a first support column 31 formed between the side walls opposite to the adjacent regular hexagonal holes 21 and the first special-shaped holes 22, and a second support column 32 formed between the second special-shaped holes 23 and the side walls opposite to the adjacent regular hexagonal holes 21 or the first special-shaped holes 22; the width of the first support column 31 is the same as the width of the second support column 32. Due to the division of the main body of the diaphragm 1 by the regular hexagonal holes 21, the first special-shaped holes 22 and the second special-shaped holes 23, the structure between the adjacent diaphragm holes forms a support structure for supporting the diaphragm 1 without collapse or splitting. Due to the coordination between different diaphragm holes, the support structure forms a connecting column that is segmented and tortuous in the vertical and horizontal directions, which improves the thickness balance of the diaphragm 1 and also improves the folding resistance and bending resistance of the diaphragm 1.

[0036] In this embodiment, the side walls of the regular hexagonal hole 21 , the first special-shaped hole 22 and the second special-shaped hole 23 respectively form a supporting wall 4 with the outer side wall of the diaphragm 1 .

[0037] like Figure 2 and Figure 3 As shown, the first special-shaped hole 22 is composed of two isosceles trapezoidal holes with parallel top sides facing each other, and a reinforcing rib 221 is formed between the two opposite top sides.

[0038] In this embodiment, the width of the reinforcing rib 221 is less than or equal to the width of the supporting column 3 .

[0039] This solution configures the first special-shaped hole 22 as a partition-type double-layer flow hole structure, and cooperates with the regular hexagonal hole 21 and the second special-shaped hole 23 to form a combination of single-layer and double-layer water channel holes. The two opposite top edges are not connected but form reinforcing ribs 221 to improve the overall strength of the diaphragm 1.

[0040] like Figures 1 to 3As shown, the symmetrical side of the diaphragm 1 is an arc-shaped transition arc edge, and the side of the second special-shaped hole 23 adjacent to the transition arc edge is also an arc-shaped. The arc-shaped transition edge is not easy to be knocked off during transportation and installation, which can increase the service life. The side of the second special-shaped hole 23 adjacent to the transition arc edge is also set to an arc shape, so that the thickness of the support wall 4 on this side is balanced.

[0041] like Figure 1 As shown, the diaphragm 1 is in the shape of a rectangular flat plate, and the diaphragm holes vertically penetrate the two ends of the diaphragm 1 along the width direction of the diaphragm 1.

[0042] In this embodiment, the membrane 1 is a silicon dioxide membrane.

[0043] The principle of this embodiment is as follows: First, the regular hexagonal hole 21 is used as the main flow hole of the diaphragm 1. According to research, under the condition of equal wall thickness and cross-section, the water flow rate per unit area of ​​different hole types is: 46.68% for the regular hexagonal hole 21, 44.63% for the triangular hole, and 41.96% for the circular hole. The water outlet cross-sectional area of ​​the regular hexagonal hole 21 is greater than that of the circular and triangular holes. Therefore, this embodiment selects the regular hexagonal hole 21 as the main flow hole of the diaphragm 1, which ensures the flat ceramic membrane of this embodiment. High flow flux; secondly, the first special-shaped hole 22 is arranged between adjacent regular hexagonal holes 21 to balance the wall thickness difference between adjacent regular hexagonal holes 21 due to the shape, and the opening rate per unit area of ​​the diaphragm 1 is balanced, so that the thickness of the support column 3 formed between the side walls of adjacent membrane holes remains consistent, and the second special-shaped hole 23 is arranged on the symmetrical side of the diaphragm 1 to balance the wall thickness difference between the second special-shaped hole 23 and the adjacent regular hexagonal hole 21 or the first special-shaped hole 22 due to the shape, thereby improving the overall strength of the flat ceramic membrane.

[0044] The advantages of this embodiment are: regular hexagonal holes 21 are selected as the main flow holes of the diaphragm 1, which ensures the high flow flux of the flat ceramic membrane of this embodiment, and the first special-shaped holes 22 are arranged in a random manner between adjacent regular hexagonal holes 21, and the second special-shaped holes 23 are arranged in a random manner between the side of the diaphragm 1 and the adjacent regular hexagonal holes 21 or the first special-shaped holes 22, so that the opening rate of the overall structure of the diaphragm 1 can be effectively balanced. When the width of the support column 3 and the thickness of the support wall 4 are the same, the uniformity of the opening and the wall thickness of the flat ceramic membrane can be greatly improved, and the leakage phenomenon in the blank making can be avoided, and the warping and fracture during the sintering process can be avoided. While ensuring the high flow flux of the flat ceramic membrane, the overall strength of the flat ceramic membrane is also improved. At the same time, the finished product is not easy to be knocked off, cornered or fractured during transportation and installation.

[0045] Example 2

[0046] This embodiment is similar to Embodiment 1, except that in this embodiment:

[0047] like Figure 4 As shown, the first special-shaped hole 22 is composed of two isosceles trapezoidal holes with parallel top sides that are connected to each other, and the hypotenuse of the isosceles trapezoidal hole is equal to the length of any side of the regular hexagonal hole 21.

[0048] In this embodiment, there is no reinforcing rib 221 .

[0049] This structural scheme enables the flat ceramic membrane to form a single layer of flow holes that are tightly and evenly arranged. The regular hexagonal holes 21 cooperate with the first special-shaped holes 22 and the second special-shaped holes 23 to meet sufficient flow area, while the wall thickness and the thickness of the support column 3 are uniform.

[0050] The other structures and principles of this embodiment are the same as those of Embodiment 1.

[0051] Example 3

[0052] This embodiment also provides a water treatment device, comprising the high-flux flat ceramic membrane as described in the above embodiment 2.

[0053] The finished flat ceramic membrane of this embodiment is not prone to knocking, chipping, or breaking during transportation and installation in a water treatment device. The water treatment device installed with the flat ceramic membrane has a good water flow area and filtering effect, and has good stability in use and a long service life.

[0054] Obviously, the above embodiments of the utility model are only examples for clearly explaining the utility model, and are not intended to limit the implementation methods of the utility model. For ordinary technicians in the relevant field, other different forms of changes or modifications can be made on the basis of the above description. It is not necessary and impossible to list all the implementation methods here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the utility model should be included in the protection scope of the claims of the utility model.

Claims

1. A high flux flat ceramic membrane, comprising a membrane sheet (1) provided with a plurality of membrane holes, characterized in that: A support column (3) is formed between the side walls of adjacent membrane holes, and a support wall (4) is formed between the side walls of the membrane holes and the outer surface of the membrane sheet (1), and the width of the support column (3) is the same as the thickness of the support wall (4) at all locations; the membrane holes include regular hexagonal holes (21) and first special-shaped holes (22) that pass through both ends of the membrane sheet (1) and are alternately arranged in a single row at equal intervals, and the opposite sides between the adjacent regular hexagonal holes (21) and the first special-shaped holes (22) are parallel to each other, and also include second special-shaped holes (23) that pass through both ends of the membrane sheet (1) and are located on two symmetrical sides of the membrane sheet (1), and the opposite sides between the second special-shaped holes (23) and the adjacent regular hexagonal holes (21) or the first special-shaped holes (22) are parallel to each other.

2. A high flux flat ceramic membrane according to claim 1, characterized in that: The support column (3) comprises a first support column (31) formed between the opposite side walls of the adjacent regular hexagonal holes (21) and the first special-shaped holes (22), and a second support column (32) formed between the opposite side walls of the second special-shaped holes (23) and the adjacent regular hexagonal holes (21) or the first special-shaped holes (22); the width of the first support column (31) at all locations is the same as the width of the second support column (32) at all locations.

3. A high flux flat ceramic membrane according to claim 1, characterized in that: The support wall (4) is formed between the side walls of the regular hexagonal hole (21), the first special-shaped hole (22) and the second special-shaped hole (23) and the outer side wall of the diaphragm (1).

4. A high flux flat ceramic membrane according to claim 1, characterized in that: The first special-shaped hole (22) is composed of two isosceles trapezoidal holes with parallel and opposite top edges, and a reinforcing rib (221) is formed between the two opposite top edges.

5. A high flux flat ceramic membrane according to claim 1, characterized in that: The first special-shaped hole (22) is composed of two isosceles trapezoidal holes with parallel top sides that are connected to each other, and the hypotenuse of the isosceles trapezoidal hole is equal to the length of any side of the regular hexagonal hole (21).

6. A high flux flat ceramic membrane according to claim 1, characterized in that: The symmetrical sides of the diaphragm (1) are arc-shaped transition arc edges.

7. A high flux flat ceramic membrane according to claim 6, characterized in that: The side of the second special-shaped hole (23) adjacent to the transition arc edge is also in an arc shape.

8. A high flux flat ceramic membrane according to claim 1, characterized in that: The diaphragm (1) is in the shape of a rectangular flat plate.

9. A high flux flat ceramic membrane according to claim 1, characterized in that: The diaphragm (1) is a diaphragm made of non-metallic material.

10. A water treatment device, characterized in that: It comprises a high flux flat ceramic membrane as described in any one of claims 1 to 9.

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