Deep filtering unit and deep filtering assembly
By setting a retention layer in the deep filtration assembly, the problems of structural stability of the deep filtration media deteriorate and fiber shedding at high flow rates are solved, and the purity and filtration performance of the permeate are maintained.
Patent Information
- Application Number
- CN202421503069.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-27
- Publication Date
- 2025-05-16
- Estimated Expiration
- 2034-06-27
AI Technical Summary
In existing deep filtration components, deep filtration media is susceptible to impact at high flow rates, resulting in reduced structural stability, fibers falling off and contaminating the permeate, affecting the filtration effect.
A retention layer is provided on the downstream side of the deep filter media. The retention layer supports the deep filter media and intercepts potentially shed fibers or tiny particles through its small pore size and rough surface to ensure the purity of the permeate.
Through the support and retention function of the intercept layer, the structural stability of the deep filter media is improved, the fibers are prevented from falling off and contaminating the permeate, ensuring the purity of the permeate, and maintaining the filtration performance.
Smart Images
Figure CN222871505U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of deep filtration, and in particular relates to a deep filtration unit and a deep filtration component. Background Art
[0002] In the existing deep filter assembly, the deep filter assembly includes at least one filter unit and an end plate disposed at the outermost side of the stacked filter unit, the filter unit includes a deep filter medium and a frame disposed around the outer periphery of the deep filter medium, wherein the frame and the end plate are provided with a liquid inlet, a liquid outlet and an exhaust port corresponding to the position. The material enters the deep filter assembly through the liquid inlet, and the permeate is obtained through the filtering action of the deep filter medium. The permeate is discharged from the deep filter assembly along the liquid outlet, and the bubbles generated during the filtration and the bubbles mixed in the material are discharged from the deep filter assembly along the exhaust port.
[0003] The deep filter medium is directly involved in the filtering process of the material. It is mainly composed of additives such as cellulose, diatomaceous earth and adhesives. The combination of complex additives and cellulose makes the internal structure of the deep filter medium complex and the stability is relatively poor. When the flow rate is high during filtration, the material impacts the deep filter medium, causing the deep filter medium to be subjected to greater pressure. As the filtration proceeds, the deep filter medium is washed away by the material and becomes slightly damaged, resulting in a decrease in the structural stability of the deep filter medium. Some fine fibers of the deep filter medium fall off and mix into the permeate, polluting the permeate and affecting the filtering effect of the deep filter assembly. Utility Model Content
[0004] The utility model provides a deep filter unit and a deep filter assembly, which can effectively ensure the integrity of the deep filter medium, prevent the falling fibers or tiny particles from mixing into the permeate, and ensure the purity of the permeate.
[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:
[0006] A deep filter unit comprises a frame and a deep filter medium arranged on the inner side of the frame, the frame is provided with a frame liquid inlet, a frame liquid outlet and a frame exhaust port, one side of the deep filter medium is a liquid inlet side, and the other side is a liquid outlet side, the frame liquid inlet and the frame exhaust port are connected to the liquid inlet side, the frame liquid outlet is connected to the liquid outlet side, and a retention layer is arranged on the downstream side of the deep filter medium. The retention layer on the downstream side of the deep filter medium can, on the one hand, support the deep filter medium, thereby improving the structural stability of the deep filter medium during the filtration process, and on the other hand, retain fibers or tiny particles that may fall off, and the permeate can smoothly pass through the retention layer to ensure the purity of the permeate.
[0007] Preferably, the average pore size of the interception layer is 0.1 to 0.8 μm; and / or, the roughness of the interception layer is 2 to 50 μm. For an interception layer with a reasonable pore size, the osmotic pressure rise is within a reasonable range when the permeate flows through the interception layer, effectively avoiding damage to the deep filter medium, while ensuring the interception effect of fibers or tiny particles falling off the deep filter medium; the interception layer with a certain rough surface can absorb the fibers free between the interception layer and the deep filter medium, and can also avoid the interception layer causing wear to the deep filter medium.
[0008] Preferably, the retention layer is a filter membrane, a retention membrane and / or a non-woven fabric.
[0009] Preferably, the retention membrane comprises retention wires and a substrate layer, and the substrate layer and the retention wires are integrally formed to form the retention membrane. The mechanical strength of the retention membrane can be effectively improved by providing the retention wires and the substrate layer.
[0010] Preferably, the diameter of the intercepting wire is 5-200 μm. The intercepting wire with suitable diameter can ensure that the intercepting layer has sufficient mechanical strength, and at the same time, avoid the intercepting wire with too large diameter affecting the filtering performance of the deep filtration unit.
[0011] Preferably, a support layer is provided at least at one of the upstream side and the downstream side of the retention layer. The openings of the support layer can support the retention membrane and provide a buffer for the retention membrane without affecting the filtering performance of the deep filtration assembly, thereby preventing the large filtering pressure of the deep filtration assembly from impacting the retention membrane and causing deformation and damage thereof.
[0012] Preferably, the support layer is a screen structure, the average pore size of the support layer openings is 2-6 mm, and the fiber diameter of the screen is 0.7-1.8 mm. The openings of the support layer can support the retention membrane and provide a buffer for the retention membrane without affecting the filtration performance of the deep filtration medium, preventing the retention membrane from being deformed and damaged by the impact of a large filtration pressure. The screen with a suitable fiber diameter can effectively support the retention membrane, prevent the retention membrane from being damaged, and at the same time have a good buffering effect on the retention membrane.
[0013] Preferably, the deep filter medium is composed of at least one layer of deep filter paperboard, and the thickness of the deep filter paperboard is 2-5 mm.
[0014] Preferably, the ratio of the thickness of the interception layer to the thickness of the deep filter paperboard is 0.01 to 0.15. Reasonable interception layer thickness can ensure the structural strength of the interception layer, and at the same time, the permeate encounters less resistance when flowing through the interception layer, thereby ensuring the filtration efficiency.
[0015] Preferably, the periphery of the retention layer and the periphery of the deep filter medium are fixedly connected to the frame. By means of the fixed connection at the periphery, fibers falling off the deep filter medium are prevented from flowing from the edge of the retention layer into the downstream permeate and causing contamination.
[0016] Preferably, the fixed connection is any one of extrusion connection, hot melt welding, ultrasonic welding and glue bonding.
[0017] A deep filter assembly comprises end plates arranged on both sides and at least one deep filter unit arranged between the end plates, wherein the end plates are provided with an end plate liquid inlet, an end plate liquid outlet and an end plate exhaust port which are correspondingly connected with a frame liquid inlet, a frame liquid outlet and a frame exhaust port.
[0018] The beneficial effects of the utility model are: (1) by arranging a retention layer on the downstream side of the deep filter medium, fibers or tiny particles that may fall off are retained to ensure the purity of the permeate; (2) the retention layer has a certain degree of roughness, which can adsorb the fibers free between the retention layer and the deep filter medium, while reducing the wear on the deep filter medium; (3) the retention layer has a high mechanical strength, which can improve the support performance for the deep filter medium, which is beneficial to maintaining the integrity of the deep filter medium, while reducing the impact on the filtering performance. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] Figure 1 It is a structural exploded view of Embodiment 1 of the present utility model;
[0020] Figure 2 It is a schematic diagram of the structure of Embodiment 1 of the present utility model;
[0021] Figure 3 It is a structural exploded view of Embodiment 2 of the present utility model;
[0022] Figure 4 It is a structural exploded view of Embodiment 3 of the present utility model;
[0023] Figure 5 This is a schematic diagram of the structure of the liquid inlet side of Embodiment 3 of the present utility model;
[0024] Figure 6 This is a schematic diagram of the structure of the liquid outlet side of Example 3 of the utility model;
[0025] Figure 7 It is a structural schematic diagram of Embodiment 4 of the present utility model;
[0026] Figure 8 It is a structural schematic diagram of embodiment 5 of the present utility model.
[0027] In the figure: deep filter medium 1, deep filter paperboard 11, liquid inlet side 101, liquid outlet side 102, deep filter unit 2, frame 20, frame liquid inlet 21, frame exhaust port 22, frame liquid outlet 23, retention layer 3, support layer 4, end plate 5, end plate liquid inlet 51, end plate exhaust port 52, end plate liquid outlet 53. DETAILED DESCRIPTION
[0028] The utility model is further described below in conjunction with the accompanying drawings and specific implementation methods.
[0029] Example 1
[0030] like Figure 1 , Figure 2 In the illustrated embodiment, a deep filter unit comprises a frame 20 and a deep filter medium 1 arranged on the inner side of the frame 20, the frame 20 is provided with a frame liquid inlet 21, a frame liquid outlet 23 and a frame exhaust port 22, one side of the deep filter medium 1 is a liquid inlet side 101, and the other side is a liquid outlet side 102, the frame liquid inlet 21 and the frame exhaust port 22 are connected to the liquid inlet side 101, the frame liquid outlet 23 is connected to the liquid outlet side 102, and a retention layer 3 is arranged on the downstream side of the deep filter medium 1. The deep filter medium 1 is generally composed of cellulose, a filter aid and an adhesive, wherein the cellulose fiber is used as a base material to provide the basic structure and mechanical strength of the paperboard; common filter aids include diatomaceous earth and perlite, and these natural mineral materials can be added to the paperboard to enhance its filtering ability and adsorption performance, especially the retention of fine particles; the adhesive is used to increase the structural stability of the filter medium. By arranging a retention layer 3 downstream of the deep filter medium 1, possible detached fibers or tiny particles can be further removed to ensure that the purity of the permeate obtained after the material is filtered meets the requirements.
[0031] The average pore size of the retention layer 3 is 0.1 to 0.8 μm. The average pore size of the retention layer 3 should not be too small. When the average pore size of the retention layer 3 is less than 0.1 μm, the osmotic pressure rises when the permeate flows through the retention layer 3. When only a single-layer deep filtration unit is provided inside the deep filtration assembly, the osmotic pressure does not increase significantly, but it will also affect the smoothness of the filtration. As the number of deep filtration units continues to increase, the osmotic pressure increases significantly, and even causes damage to the deep filtration medium 1 or the deep filtration assembly. The average pore size of the retention layer 3 should not be too large. When the average pore size of the retention layer 3 is greater than 0.8 μm, although the retention layer 3 does not cause the filtration pressure of the deep filtration assembly to rise, the fibers shed from the deep filtration medium 1 are also easy to pass through the large pores of the retention membrane, causing the permeate to be contaminated.
[0032] The roughness of the interception layer 3 is 2 to 50 μm. The rough surface of the interception layer 3 can effectively absorb the shed fibers and prevent the shed fibers from flowing between the deep filter medium 1 and the interception layer 3. The shed fibers will cause wear to the deep filter medium 1, causing more fibers to fall off from the deep filter medium 1. When the roughness of the interception layer 3 is less than 2 μm, the interception layer 3 cannot effectively absorb the shed fibers; when the roughness of the interception layer 3 is greater than 50 μm, the rough interception layer 3 is easy to wear the deep filter medium 1, causing more fibers to fall off and contaminate the permeate.
[0033] The retention layer 3 is a filter membrane, a retention membrane and / or a non-woven fabric. The retention layer 3 uses a filter membrane, a retention membrane and / or a non-woven fabric, and through a smaller average pore size, it can effectively intercept fibers and finer particles that may fall off the deep filter paperboard 11, thereby ensuring the cleanliness of the final filtrate. When the retention layer 3 uses a filter membrane, at least one of a polytetrafluoroethylene (PTFE) membrane, a polyethersulfone (PES) membrane or a nylon membrane can be selected. The use of a multi-stage filtration strategy not only ensures the filtration efficiency, but also improves the safety and reliability of the filtration process.
[0034] The retention membrane includes a retention wire and a substrate layer, and the substrate layer and the retention wire are integrally formed to form the retention membrane, and the wire diameter of the retention wire is 5-200μm. By setting the retention wire, the mechanical strength of the retention membrane can be effectively improved. When the wire diameter of the retention wire is less than 5μm, the excessively fine retention wire cannot effectively adsorb the fibers shed from the deep filter medium 1, causing the shed fibers to flow between the retention membrane and the deep filter medium 1; and when the wire diameter of the retention wire is greater than 200μm, although the retention wire can ensure the mechanical strength of the retention membrane, the retention wire that cannot penetrate the feed liquid will increase the filtration pressure of the deep filtration component and affect the filtration performance of the deep filtration component.
[0035] The deep filter medium 1 is composed of two layers of deep filter paperboard 11, the thickness of the deep filter paperboard 11 is 2-5 mm, and the ratio of the thickness of the interception layer 3 to the thickness of the deep filter paperboard 11 is 0.01 to 0.15. When the thickness of the interception layer 3 is too small, the structural strength of the interception layer 3 is insufficient. Under the high-pressure filtering environment of the deep filter assembly, the interception layer 3 with insufficient thickness is easily damaged, thereby contaminating the permeate; and when the thickness of the interception layer 3 is large, the permeate filtered by the deep filter medium 1 is subject to greater resistance when flowing through the interception layer 3, affecting the filtering efficiency of the deep filter assembly.
[0036] The periphery of the retention layer 3 and the periphery of the deep filter medium 1 are fixedly connected to the frame 20, and the fixed connection is any one of extrusion connection, hot melt welding, ultrasonic welding and glue bonding. Through the fixed connection, it is effectively prevented that the fibers falling off the deep filter medium 1 flow into the downstream permeate from the edge of the retention membrane and cause pollution.
[0037] Example 2
[0038] The difference between Example 2 and Example 1 is that Figure 3 As shown, a support layer 4 is provided on the downstream side of the retention layer 3. The support layer 4 is a screen structure, and the average pore size of the openings of the support layer 4 is 2-6 mm. The openings of the support layer 4 can support the retention layer 3 and provide a buffer for the retention layer 3 without affecting the filtration performance, thereby preventing a large filtration pressure from impacting the retention layer 3 and causing its deformation and damage. When the average pore size of the openings of the support layer 4 is less than 2 mm, the average pore size of the support layer 4 is too small, which can easily cause the filtration pressure to rise and affect the smoothness of the filtration; and when the average pore size of the openings is greater than 6 mm, due to the impact of the material during filtration, the retention layer 3 is more embedded in the support layer 4, causing damage.
[0039] The screen can effectively support the retention layer 3 and prevent the retention layer 3 from being damaged. The fiber of the screen is the main structural component of the screen supporting the retention layer 3, and the fiber diameter of the screen is 0.7-1.8mm. When the fiber diameter of the screen is less than 0.7mm, the screen is easily embedded in the retention layer 3, causing the retention layer 3 to be damaged. At the same time, the too small screen fiber diameter cannot effectively support and protect the retention layer 3; when the fiber diameter of the screen is greater than 1.8mm, the too large screen fiber diameter over-supports the retention layer 3. The retention layer 3 cannot be buffered by the screen under high-pressure impact, and it is easy to deform and block the holes in the retention layer 3 or directly cause the retention layer 3 to be damaged.
[0040] Example 3
[0041] The difference between Example 3 and Example 2 is that Figure 4 , Figure 5 and Figure 6 As shown, support layers 4 are provided on both the upstream and downstream sides of the retention layer 3. The support layer 4 located on the upstream side of the retention layer 3 is arranged on the upstream side of the deep filter medium 1, so that in the overall arrangement, the support layer 4 is located at the outermost side, playing a good supporting and protective role.
[0042] Example 4
[0043] A depth filter assembly, such as Figure 7 As shown, it includes end plates 5 arranged on both sides and a deep filter unit 2 arranged between the end plates 5, and the end plates 5 are provided with an end plate liquid inlet 51, an end plate liquid outlet 53 and an end plate exhaust port 52 correspondingly connected to the frame liquid inlet 21, the frame liquid outlet 23 and the frame exhaust port 22. The end plates 5 are fixedly welded to the frame 20 of the deep filter unit 2 to form a deep filter assembly.
[0044] During actual filtration, the feed liquid fluid flows in through the end plate liquid inlet 51, enters the liquid inlet surface of the deep filter medium 1 through the frame liquid inlet 21 of the deep filter unit 2, flows out from the liquid outlet surface of the deep filter medium 1 after being filtered by the deep filter medium 1, passes through the frame liquid outlet 23 of the deep filter unit 2, and is discharged from the end plate liquid outlet 53.
[0045] Example 5
[0046] The difference between Example 5 and Example 4 is that Figure 8 As shown, a plurality of deep filter units 2 are arranged between the two end plates 5. The deep filter units 2 are stacked and arranged between the two end plates 5, and the end plates 5 and the deep filter units 2 and the deep filter units 2 are fixed by welding, so as to form a deep filter assembly. The liquid inlet sides 101 of the deep filter units 2 are arranged relative to each other, and the liquid outlet sides 102 of the deep filter units 2 are arranged relative to each other, so that the end plate liquid inlet 51 and the frame liquid inlet 21 of the deep filter unit 2 between the two end plates 5 form a liquid inlet channel, and the end plate liquid outlet 53 and the frame liquid outlet 23 of the deep filter unit 2 between the two end plates form a liquid outlet channel. During actual filtration, the feed liquid flows in through the end plate liquid inlet 51, enters each deep filter unit 2 in turn, and flows into the liquid inlet surface of the deep filter medium 1 from the frame liquid inlet 21, flows out from the liquid outlet surface after being filtered by the deep filter medium 1, passes through the frame liquid outlet 23, and finally is discharged from the end plate liquid outlet 53.
[0047] The above is a detailed introduction to the embodiments of the present invention. Specific examples are used in this article to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method and core idea of the present invention. At the same time, for technicians in this field, according to the idea of the present invention, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the present invention.
Claims
1. A deep filter unit, comprising a frame (20) and a deep filter medium (1) arranged on the inner side of the frame (20), wherein the frame (20) is provided with a frame liquid inlet (21), a frame liquid outlet (23) and a frame air outlet (22), one side of the deep filter medium (1) is a liquid inlet side (101), and the other side is a liquid outlet side (102), the frame liquid inlet (21) and the frame air outlet (22) are in communication with the liquid inlet side (101), and the frame liquid outlet (23) is in communication with the liquid outlet side (102), wherein: A retention layer (3) is provided on the downstream side of the deep filter medium (1).
2. A deep filter unit according to claim 1, characterized in that: The average pore size of the retention layer (3) is 0.1 to 0.8 μm; and / or the roughness of the retention layer (3) is 2 to 50 μm.
3. A deep filter unit according to claim 1, characterized in that: The retention layer (3) is a filter membrane, a retention membrane and / or a non-woven fabric.
4. A deep filter unit according to claim 3, characterized in that: The retention membrane comprises retention wires and a substrate layer, and the substrate layer and the retention wires are integrally formed to form the retention membrane.
5. A deep filter unit according to claim 4, characterized in that: The diameter of the retained wire is 5-200 μm.
6. A deep filter unit according to claim 1, characterized in that: A support layer (4) is provided at least at one of the upstream side and the downstream side of the retention layer (3).
7. A deep filter unit according to claim 6, characterized in that: The support layer (4) is a screen structure, the average aperture size of the openings of the support layer (4) is 2-6 mm, and the fiber diameter of the screen is 0.7-1.8 mm.
8. A deep filter unit according to claim 1, characterized in that: The deep filter medium (1) is composed of at least one layer of deep filter paperboard (11), and the thickness of the deep filter paperboard (11) is 2-5 mm.
9. A deep filter unit according to claim 8, characterized in that: The ratio of the thickness of the retention layer (3) to the thickness of the deep filter paperboard (11) is 0.01 to 0.
15.
10. A deep filter unit according to claim 1, characterized in that: The outer periphery of the retention layer (3) and the outer periphery of the deep filter medium (1) are fixedly connected to the frame (20).
11. A deep filter unit according to claim 10, characterized in that: The fixed connection is any one of extrusion connection, hot melt welding, ultrasonic welding and glue bonding.
12. A deep filter assembly, comprising end plates (5) arranged on both sides and at least one deep filter unit (2) according to any one of claims 1 to 11 arranged between the end plates (5), characterized in that: The end plate (5) is provided with an end plate liquid inlet (51), an end plate liquid outlet and an end plate air outlet (52) which are correspondingly connected to the frame liquid inlet (21), the frame liquid outlet (23) and the frame air outlet (22).