Flat ceramic membrane, filtration device and filtration system

Abstract

The present invention provides a flat ceramic membrane, a filtering device and a filtering system, wherein the flat ceramic membrane comprises a supporting layer, a transition layer located on one side of the supporting layer, and a surface film layer located on the side of the transition layer away from the supporting layer; the supporting layer comprises a lower supporting layer and an upper supporting layer; the upper supporting layer comprises an upper extension layer, which is composed of a plurality of first arc-shaped areas with arc sections connected end to end; the lower extension layer is composed of a plurality of second arc-shaped areas with arc sections connected end to end, and the lower extension layer is composed of a plurality of second arc-shaped areas with arc sections connected end to end, and the second arc-shaped areas are staggered with the first arc-shaped areas; and a connecting layer is also included to fill the gap between the upper extension layer and the lower extension layer. As long as the supporting body of the supporting layer is composed of the upper extension layer and the upper extension layer, the first arc-shaped area and the second arc-shaped area are staggered, which not only strengthens the overall strength of the supporting layer, but also increases the toughness of the supporting layer, so that it is not easy to cause cracks on the surface of the flat ceramic membrane under high temperature and high pressure environment.

Description

Technical Field

[0001] The present invention generally relates to the field of sewage treatment, and in particular to a flat ceramic membrane, a filtering device and a filtering system. Background Art

[0002] Ceramic flat membrane is a flat filter membrane made of ceramics, which has the advantages of high chemical stability, high temperature resistance, high mechanical strength, high filtration accuracy and high backwashing performance. It is used in industrial wastewater treatment, municipal sewage treatment, drinking water treatment and special separation fields.

[0003] The ceramic flat membrane before improvement consists of a support body, a transition layer and a separation layer. In terms of the properties of ceramics, although it has a higher hardness, its ductility is poor.

[0004] The above technical solution has the following defects: under high temperature and high pressure environment, the ceramic flat membrane is prone to cracking, which can easily affect the service life of the flat membrane. Summary of the invention

[0005] According to the present invention, in view of the problems existing in the above-mentioned prior art, a flat ceramic membrane is provided, including a support layer, a transition layer located on one side of the support layer, and a surface film layer located on the side of the transition layer away from the support layer; the support layer includes a lower support layer; an upper support layer, located above the lower support layer; the upper support layer includes an upper extension layer, which is composed of a plurality of first arc-shaped areas with arc-shaped cross-sections connected end to end, and the concave side of the first arc-shaped areas faces the side of the lower support layer; the lower extension layer, which is composed of a plurality of second arc-shaped areas with arc-shaped cross-sections connected end to end, and the lower extension layer, which is composed of a plurality of second arc-shaped areas with arc-shaped cross-sections connected end to end, and the concave side of the second arc-shaped areas faces the side of the transition layer, and the second arc-shaped areas are staggered with the first arc-shaped areas; and also includes a connecting layer, which fills the gap between the upper extension layer and the lower extension layer, and the first arc-shaped area and the second arc-shaped area are filled with supporting particles, and the minimum diameter of the supporting particles is larger than the minimum pore size of the lower support layer and the connecting layer.

[0006] By having the above-mentioned technical features, the supporting body of the supporting layer only needs to be composed of an upper extension layer and an upper extension layer, and the first arc zone and the second arc zone are staggered, which not only enhances the overall strength of the supporting layer, but also increases the toughness of the supporting layer, thereby preventing the surface of the flat ceramic membrane from cracking under high temperature and high pressure conditions.

[0007] In some embodiments, the first arc-shaped area and the second arc-shaped area have the same volume. Therefore, in a high-pressure environment, when the support layer bends toward the outer arc side of the first arc-shaped area, the bending structure of the first arc-shaped area limits the bending deformation of the support layer; similarly, when the support layer bends toward the outer arc side of the second arc-shaped area, the bending structure of the second arc-shaped area limits the bending deformation of the support; and the staggered arrangement of the first arc-shaped area and the second arc-shaped area ensures the overall strength of the support layer.

[0008] In some embodiments, adjacent first arc-shaped areas are spaced apart. Thus, in a high temperature environment, the space between the first arc-shaped areas provides a deformation space for the first arc-shaped areas, while the oppositely disposed second arc-shaped areas provide opposite stable support.

[0009] In some embodiments, adjacent second arc-shaped areas are spaced apart. Thus, in a high temperature environment, the space between the second arc-shaped areas provides a deformation space for the second arc-shaped areas, while the first arc-shaped areas arranged oppositely provide stable support in opposite directions.

[0010] A filtering device comprises a frame, and a flat ceramic membrane, wherein the flat ceramic membrane is provided with at least two sheets; the frame comprises a fixed arm, movable arms connected to both ends of the fixed arm, and a closing arm simultaneously connecting the two movable arms; one end of the flat ceramic membrane is sealed with a closing portion detachably connected to a fixed wall, and the other end of the flat ceramic membrane is sealed with a suction portion detachably connected to the closing arm, and the suction portion is provided with a water outlet channel which is connected to the end face of the flat ceramic membrane and provides an external suction effect.

[0011] Therefore, the frame fixes and protects the flat ceramic membrane, the closing part limits the water inlet at the end of the flat ceramic membrane, and the suction part provides suction to the flat ceramic membrane under external suction, so that the flat ceramic membrane absorbs the liquid to be purified from both sides and discharges it through the water outlet channel.

[0012] In some embodiments, a first rotating shaft is provided in the middle of the closed part, and a first receiving groove for accommodating the rotation of the first rotating shaft is provided on the fixed arm; a second rotating shaft coaxial with the first rotating shaft is provided on the suction part, and a second receiving groove for accommodating the rotation of the second rotating shaft is provided on the closed arm. Thus, the cooperation between the first rotating shaft and the first receiving groove, and the cooperation between the second rotating shaft and the second receiving groove realizes the rotation of the flat ceramic membrane under the limit of the frame. If under a flowing water source, the swinging flat ceramic membrane can not only change the direction of the water flow, but also the impact of the water flow cooperates with the suction of the water outlet channel to ensure the filtration efficiency of the flat ceramic membrane.

[0013] In some embodiments, a driving tube is further included, each of the water outlet channels is interconnected with the driving tube, and is sealed and rotated with the driving tube connecting tube, and the driving tube is provided with a liquid outlet interconnected with an external suction device. Thus, by moving the driving tube, the swinging direction of all the flat ceramic membranes can be changed at the same time, while the suction effect on all the flat ceramic membranes is not affected.

[0014] In some embodiments, the driving tube is used to communicate with the driving tube in the adjacent filter device. Therefore, when multiple filter devices are stacked, the driving tubes can be connected to each other, and a single suction device can act on multiple filter devices at the same time, and the flow path of the water flow can be restricted by the swing of the flat ceramic membrane, thereby increasing the impact of the water flow on the flat ceramic membrane and improving the filtering effect of the flat ceramic membrane.

[0015] A filtering system comprises a pipeline system and a filtering device, wherein a water outlet channel of each filtering device is correspondingly connected to the pipeline system.

[0016] It should be understood that the contents described in the summary of the invention are not intended to limit the key or important features of the embodiments of the present disclosure, nor are they intended to limit the scope of the present disclosure. Other features of the present disclosure will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A schematic cross-sectional view of a ceramic membrane provided by an embodiment of the present invention is shown;

[0018] Figure 2 A schematic diagram showing the overall structure of a filtering device provided by an embodiment of the present invention is shown;

[0019] Figure 3 An exploded schematic diagram of a frame structure in a filtering device provided by an embodiment of the present invention is shown;

[0020] Figure 4 A schematic diagram of the structure of a flat ceramic membrane in a filtering device provided by an embodiment of the present invention is shown;

[0021] Figure 5 A schematic diagram of the connection structure of a suction part in a filtering device provided by an embodiment of the present invention is shown;

[0022] Figure 6 A schematic diagram of the connection structure of a suction part in a filtering device provided by an embodiment of the present invention is shown.

[0023] Explanation of symbols

[0024] 1. Support layer; 11. Lower support layer; 12. Upper support layer; 121. Upper extension layer; 1211. First arc-shaped area; 122. Lower extension layer; 1221. Second arc-shaped area; 123. Connection layer; 2. Transition layer; 3. Surface film layer; 4. Frame; 41. Fixed arm; 42. Movable arm; 43. Closing arm; 431. Clearance hole; 5. Flat ceramic membrane; 51. Closing part; 52. First rotating shaft; 53. Suction part; 54. Second rotating shaft; 55. Water outlet channel; 6. Drive pipe. DETAILED DESCRIPTION

[0025] Hereinafter, preferred embodiments (or implementation modes) of the present invention will be described in detail with reference to the accompanying drawings.

[0026] Reference below Figure 1-Figure 6 A flat ceramic membrane 5, a filtering device and a filtering system of the present invention are described.

[0027] Figure 1 FIG. 2 is a cross-sectional schematic diagram of a ceramic membrane provided by an embodiment of the present invention. Figure 1 As shown, a flat ceramic membrane 5 provided in this embodiment includes a support layer 1, a transition layer 2 connected to one side of the support layer 1, and a surface film layer 3 connected to a side of the transition layer 2 facing away from the support layer 1.

[0028] The support layer 1 is generally a porous structure, which increases the strength of the flat ceramic membrane 5 and provides stable support, so that the flat ceramic membrane 5 can withstand a certain pressure without being damaged. In actual applications, the flat ceramic membrane 5 may be subjected to fluid pressure or external impact force. The support layer 1 can ensure the strength of the flat ceramic membrane 5 and guarantee the overall integrity.

[0029] Specifically, the support layer 1 includes a lower support layer 11 and an upper support layer 12 connected to one side of the lower support layer 11; the upper support layer 12 includes an upper extension layer 121 and a lower extension layer 122 located on one side of the upper extension layer 121; the upper extension layer 121 is composed of a plurality of arc-shaped first arc-shaped areas 1211 arranged at intervals, and the inner concave side of each first arc-shaped area 1211 is arranged toward the lower extension layer 122; and the lower extension layer 122 is composed of a plurality of arc-shaped second arc-shaped areas 1221 arranged at intervals, and the inner concave side thereof is arranged toward The upper extension layer 121 is provided, and the first arc-shaped area 1211 and the second arc-shaped area 1221 have the same volume and opposite directions, and the first arc-shaped area 1211 and the second arc-shaped area 1221 are arranged alternately, so that the two ends of the first arc-shaped area 1211 are located in the concave area of ​​the second arc-shaped area 1221, and the two ends of the second arc-shaped area 1221 are located in the concave area of ​​the first arc-shaped area 1211, so that the upper extension layer 121 and the lower extension layer 122 fit more closely and the connection is more stable. The upper extension layer 121 and the lower extension layer 122 are connected to each other through the connecting layer 123, so as to fill the gap between the connecting layers 123. The lower support layer 11 is located on the side of the lower extension layer 122 away from the upper extension layer 121, and fills the curved arc on the surface of the lower extension layer 122, so that the side of the support layer 1 in contact with the external environment is smoother.

[0030] The first arc-shaped area 1211, the second arc-shaped area 1221, the connecting layer 123, and the lower supporting layer 11, the above-mentioned layer structures are composed of ceramic materials with different uniform particle sizes. The minimum diameter of the supporting particles filled in the first arc-shaped area 1211 and the second arc-shaped area 1221 is much larger than the minimum pore size of the connecting layer 123 of the lower supporting layer 11; and the function of the connecting layer 123 is to fill the gaps between the supporting particles in the first arc-shaped area 1211 and the second arc-shaped area 1221, thereby ensuring that the upper extension layer 121 and the lower extension layer 122 are more tightly connected.

[0031] The diameter of the supporting particles of the first arc-shaped area 1211 and the second arc-shaped area 1221 is larger than the minimum aperture of the connecting layer 123 of the lower supporting layer 11, thereby ensuring the supporting strength of the supporting layer 1. However, there will be gaps between the supporting particles, which will also cause the first arc-shaped area 1211 and the second arc-shaped area 1221 to deform under high pressure. When the first arc-shaped area 1211 undergoes a slight deformation, its own arc-shaped structure increases the toughness of its own structure and is easy to return to its original position. The second arc-shaped area 1221 will also limit its large-scale deformation. Similarly, the first arc-shaped area 1211 will also limit the large-scale deformation of the second arc-shaped area 1221. While ensuring the supporting strength of the supporting layer 1 itself, it also ensures the toughness of the supporting layer 1 and is not prone to cracks. In a high temperature environment, due to the gap between the adjacent first arc-shaped area 1211 and the adjacent second arc-shaped area 1221, a small deformation space is provided, which ensures the overall supporting strength of the supporting layer 1 while preventing the small internal deformation from being transmitted to the external surface.

[0032] The above-mentioned transition layer 2 is located on the side of the upper extension layer 121 away from the lower extension layer 122, and it plays the role of connecting the support layer 1 and the surface film layer 3, and plays a good connection role, so that the support layer 1 and the surface film layer 3 are connected more closely, and the flat ceramic membrane 5 is prevented from being delaminated when in use. In addition, the side of the transition layer 2 that is in contact with the upper extension layer 121 is in contact with the arc-shaped contours of the multiple first arc-shaped areas 1211, and the other side is close to a flat surface, thereby providing a good foundation for the attachment of the surface film layer 3, and indirectly improving the performance and stability of the surface film layer 3.

[0033] The surface film layer 3 is a key part of the flat ceramic membrane 5 to achieve the separation function, and usually has a fine microporous structure. According to different separation requirements, it can allow molecules or particles of a specific size to pass through, while preventing other unwanted substances from passing through, thereby achieving the separation of different components in the fluid.

[0034] Figure 2 The overall structure diagram of a filtering device provided by an embodiment of the present invention is shown. Figure 2 As shown, a filtering device provided in this embodiment includes a frame 4 and a plurality of flat ceramic membranes 5 fixed in the frame 4, wherein at least two or more flat ceramic membranes 5 are provided.

[0035] Figure 3 FIG. 4 is an exploded schematic diagram of a frame 4 structure in a filtering device provided by an embodiment of the present invention. Figure 3As shown, the frame 4 includes a fixed arm 41, two movable arms 42 located on both sides of the fixed arm 41, and a closed arm 43 connected between the two movable arms 42 and located on the opposite side of the fixed arm 41. The fixed arm 41, the movable arm 42, and the closed arm 43 can be fixed by bolts, or can be mutually clamped or plugged, the purpose of which is to realize the combination to form a rectangular frame structure, thereby playing a role in supporting and fixing the flat ceramic membrane 5 inside.

[0036] Figure 4 FIG. 5 is a schematic diagram showing the structure of a flat ceramic membrane 5 in a filtering device provided by an embodiment of the present invention. Figure 4 As shown, the flat ceramic membrane 5 is a rectangular plate-shaped structure, one end of which is connected to a closing part 51, and the other end is connected to a suction part 53. The closing part 51 and the suction part 53 are both shell structures sleeved on the two ends of the flat ceramic membrane 5, and the connection areas of the closing part 51, the suction part 53 and the flat ceramic membrane 5 are all sealed, wherein the sealing structure can use a rubber ring to fill the gap, or can also perform a sealing treatment in the gap to ensure the normal operation of the flat ceramic membrane 5. A cavity is formed between the suction part 53 and the end face of the flat ceramic membrane 5, and the suction part 53 is located on one side of the second rotating shaft 54. A water outlet channel 55 is fixed and communicated with the internal cavity of the closing part 51, and the axis of the water outlet channel 55 is parallel to the axis of the second rotating shaft 54.

[0037] A first rotating shaft 52 is fixed to the closing portion 51 facing away from the flat ceramic membrane 5, and a second rotating shaft 54 ​​is fixed to the side of the suction portion 53 facing away from the flat ceramic membrane 5. The second rotating shaft 54 ​​is coaxially arranged with the first rotating shaft 52. A plurality of first accommodating grooves for accommodating the first rotating shaft 52 are provided in the middle area of ​​the fixed arm 41 at intervals along the length direction of the fixed arm 41, and a second accommodating groove for accommodating the second rotating shaft 54 ​​is provided in the area opposite to each first accommodating groove, thereby realizing the installation and rotation of the flat ceramic membrane 5 by the frame 4.

[0038] Figure 5 FIG. 5 is a schematic diagram showing the connection structure of the suction part 53 in a filtering device provided by an embodiment of the present invention. Figure 5As shown, the closing arm 43 is located in the area of ​​the water outlet channel 55, and a strip-shaped clearance hole 431 is opened along the length direction of the closing arm 43, and a driving pipe 6 is arranged in the area of ​​the clearance hole 431. The driving pipe 6 is interconnected and rotatably connected with each water outlet channel 55, so that the displacement of the water outlet channel 55 can simultaneously drive multiple flat ceramic membranes 5 to rotate around the first rotating shaft 52. The two ends of the driving pipe 6 are open, one end of which can be connected to the end of the driving pipe 6 in the adjacent filtering device through a hose, and the other end can be sealed, or can be connected to an external suction device. Through the operation of the suction device, the suction part 53 is driven to provide suction to the end of the flat ceramic membrane 5. Since the other end of the flat ceramic membrane 5 is sealed, the sewage in the environment will be sucked into the inside of the flat ceramic membrane 5 through the two sides of the flat ceramic membrane 5 and will be sucked into the suction part 53 through the filtration of the flat ceramic membrane 5, and the filtered liquid will be transferred from the driving pipe 6 to the storage area to complete the final filtration.

[0039] Figure 6 FIG. 5 is a schematic diagram showing the connection structure of the suction part 53 in a filtering device provided by an embodiment of the present invention. Figure 6 As shown, in some embodiments, the filter devices can be stacked and the swing direction of the flat ceramic membrane 5 in each filter device can be adjusted by the displacement of the driving tube 6, thereby forming a tortuous water channel. During the flow of sewage in the water channel, it will impact the flat ceramic membrane 5, thereby cooperating with the external suction force combined with the impact of the water flow to improve the filtering effect of the flat ceramic membrane 5.

[0040] The filter device disclosed in the above embodiment is applied to a filter system. In one embodiment, the filter system includes a pipeline system and a filter device as provided in the above embodiment, and the water outlet management of each filter device is connected to the pipeline system. The pipeline system is used to control the flow and transmission of liquid.

[0041] In the description of this specification, the terms "connection", "installation", "fixation" and the like should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0042] The above are only preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A filtering device, characterized in that: The invention comprises a frame (4) and a flat ceramic membrane (5), wherein the flat ceramic membrane (5) is provided with at least two sheets, and the flat ceramic membrane (5) comprises a support layer (1), a transition layer (2) located on one side of the support layer (1), and a surface film layer (3) located on the side of the transition layer (2) away from the support layer (1); the support layer (1) comprises A lower supporting layer (11); An upper supporting layer (12) is located above the lower supporting layer (11); the upper supporting layer (12) comprises The upper extension layer (121) is composed of a plurality of first arc-shaped areas (1211) with arc-shaped cross sections connected end to end, wherein the concave side of the first arc-shaped area (1211) faces the lower support layer (11); The lower extension layer (122) is composed of a plurality of second arc-shaped areas (1221) with arc-shaped cross-sections connected end to end, the concave side of the second arc-shaped area (1221) faces the transition layer (2), and the second arc-shaped area (1221) and the first arc-shaped area (1211) are arranged alternately; and further includes A connecting layer (123) filling the gap between the upper extension layer (121) and the lower extension layer (122); The first arc-shaped area (1211) and the second arc-shaped area (1221) are filled with support particles, wherein the minimum diameter of the support particles is greater than the minimum pore diameter of the lower support layer (11) and the connection layer (123); The frame (4) comprises a fixed arm (41), movable arms (42) connected to both ends of the fixed arm (41), and a closing arm (43) connected to the two movable arms (42) at the same time; a sealing portion (51) detachably connected to the fixed arm (41) is sealed and fixed at one end of the flat ceramic membrane (5); a suction portion (53) detachably connected to the closing arm (43) is sealed and fixed at the other end of the flat ceramic membrane (5); the suction portion (53) is provided with a water outlet channel (55) which is in communication with the end face of the flat ceramic membrane (5) and provides an external suction function; A first rotating shaft (52) is disposed in the middle of the closing portion (51), and a first accommodating groove for accommodating the rotation of the first rotating shaft (52) is provided on the fixed arm (41); The suction portion (53) is provided with a second rotating shaft (54) coaxial with the first rotating shaft (52), and the closing arm (43) is provided with a second accommodating groove for accommodating the rotation of the second rotating shaft (54); It also includes a drive pipe (6), each of the water outlet channels (55) is interconnected with the drive pipe (6) and is sealed and rotated with the drive pipe (6) connecting pipe, and the drive pipe (6) is used to communicate with an external suction device.

2. A filtering device according to claim 1, characterized in that: The driving pipe (6) is used to communicate with the driving pipe (6) in an adjacent filtering device.

3. A filtering device according to claim 1, characterized in that: The first arc-shaped area (1211) and the second arc-shaped area (1221) have the same volume.

4. A filtering device according to claim 1, characterized in that: Adjacent first arc-shaped areas (1211) are arranged at intervals.

5. A filtering device according to claim 1, characterized in that: Adjacent second arc-shaped areas (1221) are arranged at intervals.

6. A filtering system, characterized in that: It comprises a pipeline system and a filtering device as described in any one of claims 1 to 5, and the water outlet pipeline of each filtering device is correspondingly connected to the pipeline system.

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