Novel immersed filtering membrane assembly

Abstract

The utility model discloses a novel immersed filtering membrane component which comprises two or more filtering membranes arranged in parallel, and a supporting framework is arranged between every two adjacent filtering membranes for fixed connection. The filtering membrane comprises a first filtering membrane, a membrane framework and a second filtering membrane which are sequentially arranged from left to right, and filtering output liquid flow channels are formed between the membrane framework and the first filtering membrane and between the membrane framework and the second filtering membrane. Each of the first filtering membrane and the second filtering membrane is of a multi-layer laminated structure and at least comprises a supporting layer capable of meeting the tensile strength requirement and a filtering membrane layer capable of meeting different filtering precision requirements. The supporting frameworks are arranged among the filtering membranes so as to increase the rigidity of the filtering membrane assembly, and meanwhile, when the filtering membranes are backwashed, the supporting frameworks are used for supporting the filtering membranes and preventing the filtering membranes from being damaged or the filtering membranes and the membrane frameworks from being separated and stripped.

Description

Technical Field

[0001] The utility model relates to the field of submerged filter membranes, in particular to a novel submerged filter membrane component. Background Art

[0002] Membrane filtration technology is a high-tech technology widely used in water purification, solution separation, concentration, and extraction of useful substances from wastewater, wastewater purification and reuse. It saves energy, operates at low pressure, and occupies a small area. It is widely used in pure water and ultrapure water equipment, medical sterile and non-pyrogenic raw water equipment, industrial water, drinking water, mineral water purification, industrial separation, concentration, purification, industrial wastewater treatment, electrophoretic paint, and electroplating oily wastewater treatment. In the process of these fields, submerged filter membrane components are used, but the existing submerged filter membrane components are easy to be blocked by dirt during the process of raw liquid entering because there are large particles in the raw liquid. At the same time, there is a lack of skeleton support between the filter membranes, and the anti-deformation ability is insufficient. Furthermore, the price of the filter membrane is also relatively expensive, so it is necessary to develop a new low-cost submerged filter membrane component. Utility Model Content

[0003] The purpose of the utility model is to solve the problems in the background technology and provide a novel submerged filtration membrane component.

[0004] A novel submerged filter membrane assembly comprises two or more filter membranes arranged in parallel, the upper and lower sides of the filter membranes are closed ends, and the left and right sides are liquid outlet ends; a support frame is arranged between two adjacent filter membranes for fixed connection. The filter membrane comprises a first filter membrane, a membrane frame, and a second filter membrane arranged in sequence from left to right, and a filter output liquid flow channel is formed between the membrane frame and the first filter membrane, and between the membrane frame and the second filter membrane. The first filter membrane and the second filter membrane are both multi-layer stacked structures, including at least one support layer that can meet the tensile strength requirements and one filter membrane layer that can meet different filtering accuracy requirements. The outermost edge of the support frame in the direction of the liquid inlet flow channel of the present invention is reliably bonded to the support frame and the filter membrane by a glue bonding process or a hot melt bonding process. The purpose of arranging the support frame between the filter membranes is to increase the rigidity of the filter membrane assembly. At the same time, when the filter membrane is backwashed, the support frame provides support for the filter membrane to prevent the filter membrane from being damaged or the filter membrane from being separated or peeled off from the membrane frame.

[0005] Preferably, the support frame is provided with a liquid inlet channel, and the liquid inlet channel and the output liquid channel of the membrane frame form an angle of 90° with each other.

[0006] The filter membrane and the membrane frame are assembled by glue bonding or hot-melt bonding. The purpose of glue bonding or hot-melt bonding is to ensure that the filter membrane is not separated or peeled off from the membrane frame during operation or backwashing. The filter membrane and the membrane frame can be continuously glued or hot-melt bonded, or intermittently glued or hot-melt bonded. In addition, at least one side of the filter membrane and the membrane frame is glued or hot-melt bonded and can isolate the original liquid of the filtration liquid from the output liquid after filtration, that is, to ensure that the original liquid cannot directly enter the output liquid channel of the filter membrane when the filter membrane is working.

[0007] The multi-layered filter membrane must have a certain bonding strength between the layers to ensure that the support layer and the filter membrane layer do not separate or peel off when the filter membrane filters liquid or backwashes. If the bonding strength between the support layer and the filter membrane material is not high or the pore size of the support layer is too large, one or more transition layers can be added between the support layer and the filter membrane layer. The purpose of the transition layer is to increase the bonding strength between the layers and realize the filtration pore size of the filter membrane layer. The transition layer is preferably coated on the support layer by a coating process. The plane shape of the filter membrane can be a polygon, preferably a rectangle.

[0008] The support layer is a non-woven fabric, a woven mesh or a textile filter cloth with a thickness ranging from 10 to 1000 microns, a tensile strength of 10 to 800 kN, and a porosity greater than or equal to 30%. Preferably, it is a polyethylene terephthalate non-woven fabric or a polypropylene non-woven fabric with a thickness of 100 to 300 microns and a tensile strength of 100 to 300 kN. The filter membrane layer is formed by coating polyvinylidene fluoride, polysulfone, polypropylene or vinyl chloride. The coated filter membrane layer has a thickness ranging from 5 to 1000 microns, preferably 20 to 500 microns, to ensure filtration while reducing costs.

[0009] The nominal pore size of the filtration membrane layer is in the range of 0.3 to 5000 nanometers; preferably, the nominal pore size is in the range of 3 to 20 nanometers, that is, an ultrafiltration membrane; preferably, the nominal pore size is in the range of 0.3 to 3 nanometers, that is, a nanofiltration membrane; preferably, the nominal pore size is in the range of 100 to 200 nanometers, that is, a microfiltration membrane.

[0010] Preferably, the support frame is fixedly connected to the first filter membrane and the second filter membrane by gluing.

[0011] Preferably, a flat filter screen is provided on both sides of the support frame, and the filter screen has a nominal aperture range of 0.5 to 500 microns, preferably 5 to 100 microns; the filter screen is fixed to the support frame by hot melt bonding or glue bonding, and the hot melt bonding or glue bonding position is the support platform of the support frame, which can be continuous hot melt bonding or bonding, or intermittent hot melt bonding and glue bonding. The purpose of arranging the filter screen on both sides of the support frame is to prevent particulate matter from fouling the filter membrane layer, and to prevent sharp particulate matter from scratching the filter membrane layer.

[0012] The water inlet side of the filter membrane layer may also be provided with a flat pre-filter, the nominal aperture of which ranges from 0.5 to 500 microns, preferably from 5 to 100 microns; the pre-filter is fixed to the liquid inlet side of the filter membrane layer by hot melt bonding or glue bonding. The purpose of providing the pre-filter on the liquid inlet side of the filter membrane layer is to prevent particles from fouling the filter membrane layer and to prevent sharp particles from scratching the filter membrane layer.

[0013] The filter screen arranged on the surface of the supporting frame can be a polymer material filter screen, preferably a polypropylene melt-spraying cotton filter screen or a polyethylene terephthalate (commonly known as polyester resin) non-woven filter screen; it can also be a corrosion-resistant metal filter screen, preferably an austenitic stainless steel wire woven filter screen or a filter screen made of punched austenitic stainless steel thin plates or an austenitic stainless steel foam filter screen.

[0014] The cross-section of the support frame (the section perpendicular to the liquid inlet channel) is a symmetrical or asymmetrical sine wave, a trapezoid with rounded corners, a triangle with rounded corners, or a continuous cross with rounded corners.

[0015] Preferably, the membrane skeleton is a non-flat structure, including a first resistance surface and a second resistance surface, a height difference is formed between the first resistance surface and the second resistance surface, the first resistance surface is in contact with the first filter membrane, the second resistance surface is in contact with the second filter membrane, and the first resistance surface is connected to the second resistance surface through a transition plate; the filtered output liquid flow channel is formed between two adjacent transition plates and the first filter membrane or the second filter membrane, respectively.

[0016] The present invention supports the first filter membrane through the first resistance surface and supports the second filter membrane through the second resistance surface, thereby preventing the filter membrane from being deformed during use and extending its service life.

[0017] Preferably, the filter membrane and the membrane frame are both rectangular and the length and width of the two are equal or the length and width of the filter membrane are slightly more than the length and width of the membrane frame by 1 to 5 mm, respectively, and the length-to-width ratio is preferably in the range of 0.5 to 3.0. The filter membrane and the membrane frame are continuously and reliably bonded with glue at the edge in the length direction (i.e., the direction of the output liquid flow channel) or the filter membrane and the membrane frame are continuously and reliably bonded with each other by hot melting, and the bonding or bonding width is preferably in the range of 2 to 10 mm; the two ends of the filter membrane and the membrane frame that are not bonded or hot melt bonded are the outlet ends of the filtered output liquid of the filter membrane, and the left and right outlet ends of the filtered output liquid are respectively inserted into two preset notches of the filtered output liquid collection tubes, so that the filtered output liquid collection tube is connected to the filtered output liquid flow channel, and then the surface of the filter membrane output liquid port and the seam of the notch of the filtered output liquid collection tube are reliably sealed with glue to achieve complete isolation of the filtered raw liquid and the filtered output liquid. The top of the filtered output liquid collection tube is provided with a standard pipe interface, which is convenient for connecting the pipelines of the filtration system composed of the filtration membrane assembly. Multiple filter membranes share one filtered output liquid collection tube. The present invention can collect the filtered output liquid uniformly through the filtered output liquid collection tube.

[0018] Preferably, the top surfaces of the first resistance surface and the second resistance surface are arc-shaped surfaces, and the top surfaces of the first resistance surface and the second resistance surface are planes. The arc-shaped surfaces or planes can increase the contact area between the resistance surfaces and the filter membrane, thereby enhancing the stability and reliability of the connection between the filter membrane and the supporting frame.

[0019] Preferably, the cross-sectional shape of the membrane skeleton is a symmetrical or asymmetrical sine wave, a trapezoid with rounded corners, a triangle with rounded corners, or a continuous cross with rounded corners.

[0020] Preferably, the cross-sectional shape of the support skeleton is a symmetrical or asymmetrical sine wave, a trapezoid with rounded corners, a triangle with rounded corners, or a continuous cross with rounded corners.

[0021] Preferably, the material of the membrane skeleton can be a thermoplastic polymer material, preferably polypropylene or polyethylene; it can also be a corrosion-resistant metal material, preferably austenitic stainless steel.

[0022] Preferably, the membrane skeleton can be formed by pressing a thin plate and a mold, or directly extruded by a mold; or can be formed by injection molding or casting.

[0023] Preferably, the material of the support frame can be a thermoplastic polymer material, preferably polypropylene or polyethylene or polyethylene terephthalate; it can also be a corrosion-resistant metal material, preferably austenitic stainless steel.

[0024] Preferably, the support frame can be formed by pressing a thin plate and a mold, or directly extruded by a mold, or injection molded or cast by a mold.

[0025] The outermost side of the filter membrane assembly (the side in contact with the filtered stock solution) is provided with a large particle filter screen structure, which is used to improve the anti-fouling and anti-clogging effect of the filter membrane assembly, and at the same time, prevent sharp objects from scratching the outermost filter membrane. Preferably, the large particle filter screen structure includes a partition frame, which is divided into a plurality of installation spaces, and a filter screen that cooperates with the installation space is installed in the installation space, and the nominal pore size range of the filter screen is 0.5~500 microns, preferably 5~100 microns. Each of the installation spaces is provided with a rotating plate that can rotate on the partition frame, one end of the rotating plate is rotatably connected to the partition frame, and the other end is a free end. By rotating the rotating plate, the filter screen can be partially replaced, which is more energy-saving and environmentally friendly.

[0026] In summary, the beneficial effects of the utility model are:

[0027] 1. The filter membrane support layer of the present invention is a non-woven fabric, a woven mesh or a textile filter cloth, and the filter membrane layer is a structure coated with polyvinylidene fluoride, polysulfone, polypropylene or vinyl chloride, with low raw material cost, high production efficiency and low membrane component cost; at the same time, the filter membrane has high mechanical strength and long service life; while achieving filtering performance, the system investment is reduced;

[0028] 2. The membrane module of the present invention has a rectangular structure, which has a high space volume utilization rate and can reduce the investment in the filtration system;

[0029] 3. The present invention provides filter screens on both sides of the support frame, so that large particles can be blocked, thereby enhancing the anti-fouling and anti-clogging ability of the filter membrane, while preventing sharp particles from scratching the filter membrane layer, thereby increasing the service life of the membrane assembly;

[0030] 4. The purpose of the present invention to provide a support frame between the filter membrane sheets is to increase the rigidity of the filter membrane assembly. At the same time, when the filter membrane is backwashed, it provides support for the filter membrane to prevent the filter membrane from being damaged or the filter membrane from being separated or peeled off from the membrane frame, thereby extending the service life of the membrane assembly.

[0031] 5. The present invention supports the first filter membrane through the first resistance surface and supports the second filter membrane through the second resistance surface, which can prevent the filter membrane from being deformed during use and extend the service life of the membrane assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0033] Figure 1 It is an overall schematic diagram of Embodiment 1 of the present utility model;

[0034] Figure 2 This is a cross-sectional schematic diagram of the connection between the support frame and the filter membrane in Example 1 of the utility model;

[0035] Figure 3 It is a schematic diagram of the first filter membrane or the second filter membrane of Example 1 of the utility model;

[0036] Figure 4 This is a schematic diagram of the membrane skeleton of Example 2 of the present utility model;

[0037] Figure 5 This is a schematic diagram of the membrane skeleton of Example 3 of the utility model;

[0038] Figure 6 It is a schematic diagram of the membrane skeleton of Example 4 of the utility model;

[0039] Figure 7 It is a schematic diagram of Embodiment 5 of the present utility model;

[0040] Figure 8 This is a schematic diagram of the structure of the large particle filter screen of Example 5 of the utility model;

[0041] Fig. 9 This is a schematic diagram of Example 1 of the utility model after adding a pre-filter. DETAILED DESCRIPTION

[0042] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, rather than all of the embodiments. It should be noted that the embodiments of the utility model and the features in the embodiments can be combined with each other without conflict.

[0043] It should be noted that the terms "first", "second", etc. in the specification and claims of the utility model and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence.

[0044] In the present invention, unless otherwise specified, directional words such as "up, down, left, right" are usually used with reference to the directions shown in the drawings, or with reference to the components themselves in the vertical, perpendicular or gravity directions; similarly, for ease of understanding and description, "inside and outside" refer to the inside and outside relative to the outline of each component itself, but the above directional words are not used to limit the present invention.

[0045] The following specific embodiments are merely explanations of the present invention and are not limitations of the present invention. After reading this specification, those skilled in the art may make modifications to the embodiments without any creative contribution as needed. However, as long as they are within the scope of the claims of the present invention, they are protected by the patent law.

[0046] The present invention will be described in detail below with reference to the accompanying drawings. Example 1

[0047] like Figures 1 to 3 and Fig. 9As shown, a sheet-type ultrafiltration membrane assembly includes two or more filter membranes 1 arranged in parallel, and two adjacent filter membranes 1 are fixedly connected by a support frame 10. A flat filter screen is arranged on both sides of the support frame, and the filter screen has a nominal aperture range of 0.5 to 500 microns, preferably 5 to 100 microns; the filter screen is fixed to the support frame by a hot melt bonding or glue bonding process, and the hot melt bonding or glue bonding position is the support base of the support frame, which can be continuous hot melt bonding or bonding, and can also be intermittent hot melt bonding and glue bonding. The liquid inlet side of the filter membrane layer 122 can also be provided with a flat pre-filter screen, and the nominal aperture range of the pre-filter screen is 0.5 to 500 microns, preferably 5 to 100 microns. The pre-filter screen is fixed to the liquid inlet side of the filter membrane layer 122 by a hot melt bonding or glue bonding process. The filter membrane 1 includes a first filter membrane 12, a membrane skeleton 13, and a second filter membrane 14, which are arranged from left to right. A filter output liquid flow channel 16 is formed between the membrane skeleton 13 and the first filter membrane 12, and between the membrane skeleton 13 and the second filter membrane 14. The first filter membrane 12 and the second filter membrane 14 are multi-layered structures, which include at least one support layer 121 that can meet the tensile strength requirements and a filter membrane layer 122 that can meet different filtering precision requirements. The support skeleton is provided with a liquid inlet flow channel 101, and the liquid inlet flow channel 101 and the output liquid flow channel of the membrane skeleton are at a 90° angle to each other. There must be a certain bonding strength between the layers of the multi-layered structure of the filter membrane to ensure that the support layer and the filter membrane layer are not separated or peeled off when the filter membrane is filtering liquid or backwashing the filter membrane; if the bonding strength between the support layer and the filter membrane layer is not high or the pore size of the support layer is too large, one or more transition layers can be added between the support layer and the filter membrane layer. The purpose of the transition layer is to increase the bonding strength between the layers and realize the filtering pore size of the filter membrane layer. The plane shape of the filter membrane can be a polygon, preferably a rectangle. The support layer is a non-woven fabric with a thickness range of 10 to 1000 microns and a tensile strength of 10 to 800 kN, or a textile filter cloth with a porosity greater than 30%, or a woven mesh with a porosity greater than 30%, preferably a polyethylene terephthalate (commonly known as polyester resin) non-woven fabric or a polypropylene non-woven fabric with a thickness of 100 to 300 microns and a tensile strength of 100 to 300 kN. The filter membrane layer is a filter membrane layer coated with polyvinylidene fluoride, polysulfone, polypropylene or vinyl chloride, and the thickness of the coated membrane layer ranges from 5 to 1000 microns, preferably 20 to 500 microns. The membrane skeleton 13 includes a first resistance surface 131 and a second resistance surface 132, and a height difference is formed between the first resistance surface 131 and the second resistance surface 132. The first resistance surface 131 is in contact with the first filter membrane 12, and the second resistance surface 132 is in contact with the second filter membrane 14. The first resistance surface 131 is connected to the second resistance surface 132 through a transition plate 133; the filtered output liquid flow channel 16 is respectively formed between two adjacent transition plates 133 and the first filter membrane 12 or the second filter membrane 14.A filtered output liquid collecting pipe 17 is provided at the outlet end of the output liquid flow channel, and an output liquid interface 171 is provided at the top of the filtered output liquid collecting pipe 17 . Multiple filter membranes 1 share one filtered output liquid collecting pipe 17 .

[0048] Working principle:

[0049] like Figures 1 to 3 and Fig. 9 As shown, when the present invention is used, the output liquid interface 171 is sucked, and the raw liquid passes through the liquid inlet channel of the support frame, and first passes through the filter screens 102 on both sides of the support frame to filter large particles, and then passes through the first filter membrane 12 or the second filter membrane 14 for further filtration, and then flows out through the filtered output liquid channel, and is sucked away through the filtered output liquid collection pipe. Large particles can be blocked by the first filter screen 102, so as to achieve the effect of anti-fouling and anti-clogging, and extend the service life of the membrane assembly. A support frame is arranged between the filter membranes to enhance the rigidity of the filter membrane assembly. At the same time, when the filter membrane is backwashed, support is provided to the filter membrane to prevent damage to the filter membrane or separation and peeling of the filter membrane from the membrane frame. Example 2

[0050] like Figure 4 As shown, different from the first embodiment, the top surfaces of the first resistance surface 131 and the second resistance surface 132 are arc-shaped surfaces. Example 3

[0051] like Figure 5 As shown, different from the first embodiment, the top surfaces of the first resistance surface 131 and the second resistance surface 132 are planar. Example 4

[0052] like Figure 6 As shown, different from the embodiment 1, the cross section of the membrane skeleton 13 is in a continuous cross shape. Example 5

[0053] like Figure 7-8 As shown, different from Example 1, a large particle filter screen structure 11 is further provided on the outside of the outermost filter membrane sheet 1 of the filter membrane assembly, and the large particle filter screen structure 11 includes a partition frame 111, and the partition frame 111 is divided into a plurality of installation spaces 112, and a filter screen 113 cooperating with the installation space 112 is installed in the installation space 112, and the nominal pore size range of the filter screen 113 is 0.5~500 microns, preferably 5~100 microns; each of the installation spaces 112 is provided with a rotating plate 114 that can rotate on the partition frame 111, one end of the rotating plate 114 is rotatably connected to the partition frame 111, and the other end is a free end, so as to enhance the anti-fouling and anti-clogging effect. During use, when it is found that the filter screen on the filter screen structure needs to be replaced, it only needs to rotate the rotating plate to carry out partial replacement, which is more energy-saving and environmentally friendly.

Claims

1. A novel submerged filtration membrane assembly, characterized in that: The invention comprises two or more filter membranes (1) arranged in parallel, wherein the upper and lower sides of the filter membrane (1) are closed ends, and the left and right sides are liquid outlet ends; two adjacent filter membranes (1) are fixedly connected by a support frame (10) of a non-flat structure; the filter membrane (1) comprises a first filter membrane (12), a membrane frame (13) of a non-flat structure, and a second filter membrane (14) arranged in sequence from left to right; a filter output liquid flow channel (16) is formed between the membrane frame (13) and the first filter membrane (12), and between the membrane frame (13) and the second filter membrane (14); the first filter membrane (12) and the second filter membrane (14) are both multi-layer laminated structures, and at least include a support layer (121) that can meet the tensile strength requirements, and a filter membrane layer (122) that can meet the requirements of different filtering accuracies.

2. A novel submerged filtration membrane assembly according to claim 1, characterized in that: The support layer (121) is a non-woven fabric, a woven mesh, or a textile filter cloth with a thickness ranging from 10 to 1000 microns, a tensile strength of 10 to 800 kilonewtons, and a porosity greater than or equal to 30%. The filter membrane layer (122) is a coated polyvinylidene fluoride, a coated polysulfone, a coated polypropylene, or a coated vinyl chloride, and the coating layer thickness ranges from 5 to 1000 microns.

3. A novel submerged filtration membrane assembly according to claim 1, characterized in that: The nominal pore size of the filter membrane layer (122) ranges from 0.3 to 5000 nanometers.

4. A novel submerged filtration membrane assembly according to claim 1, characterized in that: Flat-lay filter screens (102) may be provided on both sides of the support frame (10); the filter screen (102) has a nominal aperture range of 0.5 to 500 micrometers, and the filter screen is fixed to the support frame (10) by hot-melt bonding or glue bonding.

5. A novel submerged filtration membrane assembly according to claim 1, characterized in that: A flat pre-filter (103) may also be provided on the liquid inlet side of the filter membrane layer (122), wherein the nominal pore size of the pre-filter (103) ranges from 0.5 to 500 microns; the pre-filter (103) is fixed to the liquid inlet side of the filter membrane layer (122) by hot-melt bonding or gluing.

6. A novel submerged filtration membrane assembly according to claim 1, characterized in that: The support frame (10) is a non-flat plate structure, and its cross-sectional shape is a symmetrical or asymmetrical sine wave, a trapezoid with rounded corners, a triangle with rounded corners, or a continuous cross with rounded corners.

7. A novel submerged filtration membrane assembly according to claim 1, characterized in that: The membrane skeleton (13) comprises a first resistance surface (131) and a second resistance surface (132), a height difference being formed between the first resistance surface (131) and the second resistance surface (132), the first resistance surface (131) being in contact with the first filter membrane (12), the second resistance surface (132) being in contact with the second filter membrane (14), the first resistance surface (131) being connected to the second resistance surface (132) via a transition plate (133); the filtered output liquid flow channel (16) is formed respectively between two adjacent transition plates (133) and the first filter membrane (12) or the second filter membrane (14).

8. A novel submerged filtration membrane assembly according to claim 1, characterized in that: A filtered output liquid collection pipe (17) is provided at the outlet end side of the filtered output liquid flow channel, a top end of the filtered output liquid collection pipe (17) is provided with an output liquid interface (171), and a plurality of filter membranes (1) share one filtered output liquid collection pipe (17).

9. A novel submerged filtration membrane assembly according to claim 7, characterized in that: The top surfaces of the first resistance surface (131) and the second resistance surface (132) are arc-shaped surfaces.

10. A novel submerged filtration membrane assembly according to claim 7, characterized in that: The top surfaces of the first resistance surface (131) and the second resistance surface (132) are plane.

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