Perfluorinated filter element applicable to high-pH working condition

Abstract

The utility model provides a perfluorinated filter element applicable to a high-pH working condition, which belongs to the technical field of liquid filter elements and comprises an outer framework. The inner framework is fixedly connected into the outer framework, and a cavity used for installing the filtering structure is formed between the outer framework and the inner framework; the filtering structure comprises a supporting layer, a filtering membrane and a flow guide layer, the supporting layer, the filtering membrane and the flow guide layer are fixedly connected into the cavity, and the supporting layer, the filtering membrane and the flow guide layer are sequentially arranged from the circumferential surface of the inner framework to the circumferential inner wall of the outer framework; by using the device, fluid is subjected to multi-stage filtration through the filtration structure, the filtration precision is guaranteed, the filter element can be normally used in a high-pH environment through materials used by the device, the fluid flux is kept uniform, the situation that system pressure is increased due to low-flux operation is avoided, and the service life of the filter element is prolonged.

Description

Technical Field

[0001] This utility model belongs to the field of liquid filtration filter element technology, specifically relating to a perfluorinated filter element suitable for high pH conditions. Background Technology

[0002] Perfluorinated filter elements are filter components made of perfluorinated materials, such as polytetrafluoroethylene (PTFE) and perfluoroalkoxy resins (PFA), and are widely used in many fields due to their superior performance. They possess extremely strong chemical stability, resisting corrosion from strong acids, strong alkalis, and organic chemical reagents, while also exhibiting excellent high-temperature resistance, remaining stable in high-temperature environments. Perfluorinated filter elements offer high filtration accuracy and large flow rate, making them suitable for precision filtration and fluid handling under harsh conditions. Their unique material properties make them play a vital role in industries such as chemical, pharmaceutical, and food processing, effectively ensuring fluid purity and stable system operation.

[0003] PFA pleated filter cartridges are made of PFA plastic, a copolymer of polytetrafluoroethylene (PTFE) and perfluoropropyl perfluorovinyl ether (PFVA). They offer high filtration accuracy, stable chemical properties, and resistance to acids, alkalis, corrosion, high temperatures, and oxidation. Compared to PTFE, PFA retains most of the properties of PTFE, but is also easier to process and can melt and flow above its melting point.

[0004] In existing technologies, the flow rate of filter cartridges decreases under high pH conditions, affecting filtration efficiency and resulting in slower water production, which fails to meet water demand. Prolonged low-flow operation also increases system pressure, exacerbates filter cartridge contamination and wear, shortens filter cartridge life, and increases operating costs. Utility Model Content

[0005] The purpose of this invention is to provide a perfluorinated filter element suitable for high pH conditions, aiming to solve the problems in the prior art where the flow rate of the filter element decreases under high pH conditions, affecting the filtration efficiency, resulting in slower water production and failure to meet water demand; long-term low-flow operation also increases system pressure, aggravates filter element contamination and wear, shortens filter element life, and increases operating costs.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A perfluorinated filter element suitable for high pH conditions, comprising:

[0008] Exoskeleton;

[0009] An inner frame is fixedly connected to an outer frame, and a cavity for installing a filter structure is formed between the outer frame and the inner frame.

[0010] The filtration structure includes a support layer, a filter membrane, and a flow guiding layer. The support layer, filter membrane, and flow guiding layer are all fixedly connected within the cavity. The support layer, filter membrane, and flow guiding layer are arranged sequentially from the circumferential surface of the inner skeleton to the circumferential inner wall of the outer skeleton.

[0011] In a preferred embodiment of this utility model, the support layer and the flow guiding layer are both high-purity PFA woven mesh, and the filter membrane is a high-purity, high-precision PTFE filter membrane.

[0012] In a preferred embodiment of this utility model, both the outer skeleton and the inner skeleton are made of high-purity PFA extruded material.

[0013] In a preferred embodiment of this invention, the support layer, filter membrane, and flow guiding layer are all uniformly wrinkled structures.

[0014] As a preferred embodiment of this utility model, the circumferential surface of the inner skeleton is provided with a plurality of first holes, and the circumferential surface of the outer skeleton is provided with a plurality of second holes.

[0015] As a preferred embodiment of this utility model, a plurality of guide tubes are fixedly connected to the circumferential surface of the inner skeleton, and the plurality of guide tubes are respectively connected to a plurality of first holes, and the inner circumferential walls of the plurality of second holes are provided with guide slopes.

[0016] As a preferred embodiment of this utility model, the diameter of the plurality of first pores decreases sequentially from top to bottom.

[0017] Compared with the prior art, the beneficial effects of this utility model are:

[0018] 1. In this solution, by using this device, the fluid undergoes multi-stage filtration through the filtration structure, ensuring filtration accuracy. The materials used in the device enable the filter element to function normally in a high pH environment, maintain uniform fluid flow, avoid increasing system pressure due to low flow operation, and improve the service life of the filter element.

[0019] 2. In this design, the aperture size decreases sequentially from top to bottom to balance the pressure of the fluid inside the inner skeleton, thus keeping the pressure inside the inner skeleton uniform. Attached Figure Description

[0020] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0021] Figure 1 This is a first-view perspective perspective view of the present invention;

[0022] Figure 2 This is a first sectional view of the present invention;

[0023] Figure 3 This utility model Figure 2 A magnified view of a section at point A in the middle;

[0024] Figure 4 This is a second sectional view of the present invention.

[0025] In the diagram: 1. Outer skeleton; 2. Inner skeleton; 3. Support layer; 4. Filter membrane; 5. Flow guiding layer; 6. First pore; 7. Second pore; 8. Flow guiding slope; 9. Flow guiding tube; 10. Sealing ring; 11. End cap. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model. Example

[0027] Please see Figures 1-4 The present invention provides the following technical solution:

[0028] A perfluorinated filter element suitable for high pH conditions, comprising:

[0029] Exoskeleton 1;

[0030] The inner frame 2 is fixedly connected to the outer frame 1, and a cavity for installing the filter structure is formed between the outer frame 1 and the inner frame 2.

[0031] The filtration structure includes a support layer 3, a filter membrane 4, and a flow guiding layer 5. The support layer 3, the filter membrane 4, and the flow guiding layer 5 are all fixedly connected in the cavity. The support layer 3, the filter membrane 4, and the flow guiding layer 5 are arranged sequentially from the circumferential surface of the inner skeleton 2 to the circumferential inner wall of the outer skeleton 1.

[0032] In a specific embodiment of this utility model, the inner skeleton 2 and the outer skeleton 1 constitute the skeleton part of the perfluorinated filter element. The cavity between the outer skeleton 1 and the inner skeleton 2 is used to install the filter structure. The filter structure consists of a support layer 3, a filter membrane 4, and a flow guiding layer 5. The support layer 3, the filter membrane 4, and the flow guiding layer 5 are arranged sequentially from the circumferential surface of the inner skeleton 2 to the inner circumferential wall of the outer skeleton 1. The filter membrane 4 is located between the support layer 3 and the flow guiding layer 5. The support layer 3 and the filter membrane 4 are used for filtration, and the flow guiding layer 5 plays the functions of filtration and flow guiding, accelerating filtration. The support layer 3, the filter membrane 4, and the flow guiding layer 5 form a multi-stage filtration, effectively ensuring the filtration effect. Two sealing rings 10 are fixedly connected to the upper part of the circumferential surface of the inner skeleton 2. The sealing rings 10 are used to increase the sealing of the filter element installation. End caps 11 are fixedly connected to the lower ends of the outer skeleton 1 and the inner skeleton 2. The end caps 11 are used to improve the stability of the filter structure in the cavity.

[0033] Please refer to the details. Figures 1-4 The support layer 3 and the flow guiding layer 5 are both high-purity PFA woven mesh, and the filter membrane 4 is a high-purity, high-precision PTFE filter membrane.

[0034] In this embodiment: the support layer 3 and the flow guiding layer 5 are made of high-purity PFA woven mesh, and the filter membrane 4 is made of high-purity, high-precision PTFE filter membrane. Using this material allows the filter element to operate normally under high pH conditions. This filter element design, through material science innovation, achieves stable operation under extreme conditions. The PFA woven mesh, as the support and flow guiding layer material, provides reliable support for the filter membrane while ensuring efficient fluid flow between layers due to its excellent chemical corrosion resistance (maintaining structural stability in strong acid and alkali environments at 260℃) and creep resistance. The core filtration unit uses a PTFE filter membrane, whose nanoscale fiber structure is formed into a dense pore size (adjustable from 0.1-10μm) through a biaxial stretching process, achieving a 99.999% retention efficiency while maintaining high throughput. Specifically designed for high pH conditions (pH 1-14), the PTFE surface undergoes hydrophobic treatment to form a self-cleaning interface, effectively preventing hydroxide crystallization and clogging. Meanwhile, the flexible structure of the PFA skeleton compensates for thermal stress deformation. The synergistic effect of these two components allows the filter element to maintain its integrity even under 120°C high-temperature steam sterilization and 10MPa pressure shock. This composite structure is ISO 11737 biocompatibility certified and exhibits superior durability in chemical separation and pharmaceutical purification applications. Its single-use lifespan is up to five times that of traditional PP filter elements, significantly reducing maintenance costs.

[0035] Please refer to the details. Figures 1-4 Both the outer skeleton 1 and the inner skeleton 2 are made of high-purity PFA extruded material.

[0036] In this embodiment, the outer skeleton 1 and the inner skeleton 2 are made of high-purity PFA extruded material to ensure that the filter element can be used normally under high pH conditions.

[0037] Please refer to the details. Figure 4 The support layer 3, filter membrane 4, and flow guiding layer 5 are all uniformly wrinkled structures.

[0038] In this embodiment: the support layer 3, the filter membrane 4, and the flow guiding layer 5 are all uniformly pleated structures, which greatly increases the filtration surface area per unit length; compared with the straight structure, the surface area of ​​the pleated filter element is increased by multiples, thereby providing higher filtration efficiency in the same volume, keeping the water flow velocity uniform, meeting water demand; keeping the fluid flux uniform, avoiding low-flux operation from increasing system pressure, and improving the service life of the filter element.

[0039] Please refer to the details. Figures 1-4 The inner skeleton 2 has multiple first holes 6 on its circumferential surface, and the outer skeleton 1 has multiple second holes 7 on its circumferential surface.

[0040] In this embodiment, multiple first pores 6 and second pores 7 respectively make the surfaces of the inner skeleton 2 and the outer skeleton 1 porous. The porous structure allows the fluid to have more contact opportunities with the filter element, thereby improving the particle retention efficiency.

[0041] Please refer to the details. Figures 1-4 Multiple guide pipes 9 are fixedly connected to the circumferential surface of the inner skeleton 2. The multiple guide pipes 9 are respectively connected to multiple first holes 6. The inner circumferential walls of multiple second holes 7 are provided with guide slopes 8.

[0042] In this embodiment, multiple guide tubes 9 are connected to multiple first pores 6 respectively, which serves to guide the flow and improve the contact efficiency between the fluid and the filter structure.

[0043] Please refer to the details. Figures 1-4 The diameter of the multiple first pores 6 decreases sequentially from top to bottom.

[0044] In this embodiment, the aperture size decreases sequentially from top to bottom to balance the pressure of the fluid inside the inner skeleton 2, so that the pressure inside the inner skeleton 2 remains uniform.

[0045] The working principle and usage process of this utility model are as follows: First, the device is installed inside the equipment. The fluid enters the inner frame 2 and passes through the filtration structure. The fluid undergoes multi-stage filtration through the support layer 3, filter membrane 4, and flow guiding layer 5 in the filtration structure. The filtered fluid flows out through the pores on the surface of the outer frame 1. By using this device, the fluid undergoes multi-stage filtration through the filtration structure, ensuring filtration accuracy. The materials used in the device allow the filter element to operate normally in a high pH environment, maintaining uniform fluid flow, avoiding low-flow operation that increases system pressure, and improving the service life of the filter element.

[0046] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A perfluorinated filter element suitable for high pH conditions, characterized in that, include: Exoskeleton (1); The inner frame (2) is fixedly connected to the outer frame (1), and a cavity for installing the filter structure is formed between the outer frame (1) and the inner frame (2). The filtration structure includes a support layer (3), a filter membrane (4) and a flow guiding layer (5). The support layer (3), the filter membrane (4) and the flow guiding layer (5) are all fixedly connected in the cavity. The support layer (3), the filter membrane (4) and the flow guiding layer (5) are arranged sequentially from the circumferential surface of the inner skeleton (2) to the circumferential inner wall of the outer skeleton (1).

2. The perfluorinated filter element suitable for high pH conditions according to claim 1, characterized in that: The support layer (3) and the flow guiding layer (5) are both high-purity PFA woven mesh, and the filter membrane (4) is a high-purity and high-precision PTFE filter membrane.

3. A perfluorinated filter element suitable for high pH conditions according to claim 2, characterized in that: Both the outer skeleton (1) and the inner skeleton (2) are made of high-purity PFA extruded material.

4. A perfluorinated filter element suitable for high pH conditions according to claim 3, characterized in that: The support layer (3), filter membrane (4) and flow guiding layer (5) are all uniformly wrinkled structures.

5. A perfluorinated filter element suitable for high pH conditions according to claim 4, characterized in that: The inner skeleton (2) has a plurality of first holes (6) on its circumferential surface, and the outer skeleton (1) has a plurality of second holes (7) on its circumferential surface.

6. A perfluorinated filter element suitable for high pH conditions according to claim 5, characterized in that: The inner skeleton (2) has multiple guide tubes (9) fixedly connected to its circumferential surface. The multiple guide tubes (9) are respectively connected to multiple first holes (6). The inner circumferential walls of the multiple second holes (7) are provided with guide slopes (8).

7. A perfluorinated filter element suitable for high pH conditions according to claim 6, characterized in that: The diameter of the plurality of first pores (6) decreases sequentially from top to bottom.

Images