Replaceable membrane filter

Abstract

This utility model relates to the field of laboratory filtration technology and proposes a replaceable membrane filter, including an end cap and a filter housing sealed to the end cap. The end of the end cap away from the filter housing is the water inlet, and the end of the filter housing away from the end cap is the water outlet. A middle cylinder and an inner cylinder are fixed inside the filter housing, arranged concentrically. A plurality of first filter elements are radially arranged between the middle cylinder and the filter housing, and second filter elements are arranged between the middle cylinder and the inner cylinder, corresponding to the first filter elements. This utility model, through a four-stage filtration system of pretreatment, coarse filtration, fine filtration, and deep filtration, can accurately intercept impurities of different particle sizes and disperse the filtration load of each stage, significantly reducing the probability of clogging of the core filter membrane. It is especially suitable for filtration scenarios involving large batches of solvents with high impurity content.

Description

Technical Field

[0001] This utility model relates to the field of laboratory filtration technology, specifically to a replaceable membrane filter. Background Technology

[0002] In many fields, including laboratories and industrial production, solvent filtration is frequently required to remove impurities or microorganisms. Currently, replaceable membrane filters are widely used, and some even have sterilization capabilities for use in aseptic environments.

[0003] However, existing conventional sterilizable and replaceable membrane filters have certain limitations. When filtering large batches of solvents or solvents with many impurities, the filter membrane is easily clogged. Once the membrane is clogged, it cannot be replaced on-site in a clean bench, so the entire filter must be re-sterilized. This not only wastes a lot of time and resources, but may also affect the entire production or experimental process due to operational interruption, reducing work efficiency. Utility Model Content

[0004] This invention proposes a replaceable membrane filter, which solves the problem that the membrane of the filter is easily clogged in the prior art, affecting the entire production or experimental process.

[0005] The technical solution of this utility model is as follows: a replaceable membrane filter, including an end cap and a filter housing sealed to the end cap. The end of the end cap away from the filter housing is the water inlet, and the end of the filter housing away from the end cap is the water outlet. A middle cylinder and an inner cylinder are fixed inside the filter housing. A plurality of first filter elements are radially arranged between the middle cylinder and the filter housing. A plurality of second filter elements are arranged between the middle cylinder and the inner cylinder, corresponding to the first filter elements. The plurality of first filter elements divide the cavity between the middle cylinder and the filter housing to form alternating first filtration zones and first purification zones. The plurality of second filter elements divide the cavity between the middle cylinder and the inner cylinder to form alternating second filtration zones and second purification zones. Raw water entering the end cap from the water inlet passes sequentially through the first filtration zone, the first purification zone, the second filtration zone, and the second purification zone before entering the inner cylinder. A filter element is arranged inside the inner cylinder.

[0006] Preferably, the end face of the end cap is a stepped surface, and a fan-shaped opening communicating with the first filtration zone is provided through the stepped surface, and an intercepting net is provided in the fan-shaped opening.

[0007] Preferably, the end cap has a non-penetrating positioning groove at the center of the stepped surface, one end of the filter element is embedded in the positioning groove, and the other end of the filter element is pressed by the filter shell.

[0008] Preferably, both the first filter element and the second filter element include a square frame and a filter membrane disposed within the square frame, and the pore sizes of the intercepting net, the filter membrane of the first filter element, and the filter membrane of the second filter element decrease sequentially.

[0009] Preferably, the accommodating space of the first filtration zone is larger than the accommodating space of the second filtration zone.

[0010] Preferably, the intermediate cylinder has a first slot that connects the first purification zone and the second filtration zone.

[0011] Preferably, the inner cylinder has a second slot that allows the second purification zone to communicate with the inner cavity of the inner cylinder.

[0012] Preferably, the inner wall of the filter housing and the outer wall of the intermediate cylinder are provided with a first rubber clamp for clamping the first filter element, and the inner wall of the intermediate cylinder and the outer wall of the inner cylinder are provided with a second rubber clamp for clamping the second filter element.

[0013] Preferably, a sealing ring is provided between the end cap and the filter housing flange, and the sealing ring is fixed by bolts.

[0014] The beneficial effects of this utility model are as follows: 1. This utility model uses a four-stage filtration system of pretreatment, coarse filtration, fine filtration and deep filtration, which can not only accurately intercept impurities of different particle sizes, but also disperse the filtration load of each stage, greatly reducing the probability of clogging of the core filter membrane. It is especially suitable for filtration scenarios with large batches of solvents with high impurity content. 2. This utility model achieves independent replacement of individual components through the modular design of the core filter components, eliminating the need to re-sterilize the entire filter, saving time and resources, while reducing operational difficulty and improving work efficiency. Attached Figure Description

[0015] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0016] Figure 1 This is a schematic diagram of the overall structure of the replaceable membrane filter proposed in this utility model; Figure 2 This is a schematic diagram of the disassembly structure of the replaceable membrane filter proposed in this utility model; Figure 3 This is a schematic diagram of the end cap, first filter element, second filter element, and filter element structure proposed in this utility model; Figure 4 This is a schematic diagram of the end cap structure proposed in this utility model; Figure 5 This is a schematic diagram of the filter housing structure proposed in this utility model; Figure 6This is a schematic cross-sectional view of the replaceable membrane filter proposed in this utility model. In the diagram: 1. End cap; 11. Fan-shaped opening; 12. Interception net; 13. Positioning groove; 2. Filter housing; 21. Intermediate cylinder; 22. Inner cylinder; 23. First rubber gasket; 24. Second rubber gasket; 25. First slot; 26. Second slot; 3. Water inlet; 4. Water outlet; 5. Bolt; 6. Sealing ring; 7. First filter element; 8. Second filter element; 9. Filter cartridge. Detailed Implementation

[0017] The technical solutions of this utility model will be clearly and completely described below with reference to the embodiments of this utility model. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this utility model.

[0018] Please see Figure 1 and Figure 2 This utility model provides a technical solution: a replaceable membrane filter, including an end cap 1 and a filter housing 2 sealed to the end cap 1. The end of the end cap 1 away from the filter housing 2 is the inlet 3, and the end of the filter housing 2 away from the end cap 1 is the outlet 4. Both the end cap 1 and the filter housing 2 are made of materials with good high temperature and high pressure resistance and good chemical stability, such as high-quality stainless steel or specific types of high-temperature resistant plastics, to ensure that they can withstand conventional sterilization operations (such as high-temperature steam sterilization, with temperatures reaching 121°C and above), and will not chemically react with solvents during the filtration process, thus affecting the filtration effect. The filter housing 2 has a concentrically arranged intermediate cylinder 21 and inner cylinder 22 fixed inside, adopting a three-layer cavity structure with the filter housing 2, intermediate cylinder 21 and inner cylinder 22 concentrically arranged, realizing multi-stage filtration function integration within a limited equipment volume, while ensuring the internal cavity... With no dead angles, it facilitates the penetration of sterilization methods such as high-temperature steam, and is suitable for the aseptic operation requirements of laboratories. Several first filter elements 7 are radially arranged between the intermediate cylinder 21 and the filter shell 2, and second filter elements 8 are arranged between the intermediate cylinder 21 and the inner cylinder 22, corresponding to the first filter elements 7. The several first filter elements 7 divide the cavity between the intermediate cylinder 21 and the filter shell 2 to form alternating first filtration zones and first purification zones. The several second filter elements 8 divide the cavity between the intermediate cylinder 21 and the inner cylinder 22 to form alternating second filtration zones and second purification zones. The raw water entering the end cap 1 from the inlet 3 passes through the first filtration zone, the first purification zone, the second filtration zone, and the second purification zone in sequence before entering the inner cylinder 22. The inner cylinder 22 is equipped with a filter element 9, forming a closed-loop flow path of "radial separation + axial progression" to ensure that each stage of filtration can fully act on the solvent.

[0019] Please see Figure 3 and Figure 4 The end face of the end cap 1 is a stepped surface, and a fan-shaped opening 11 communicating with the first filtration zone is opened through the stepped surface. An interception net 12 is installed in the fan-shaped opening 11. The interception net 12 can be disassembled, replaced and cleaned by snap-fit ​​or other fixing methods. The interception net 12 directly intercepts large particulate precipitates inside the end cap 1. The interception net 12 adopts a large pore size, selected between 200 and 500 micrometers. The interception net 12 prioritizes intercepting large particulate precipitates (such as suspended impurities and blocky pollutants) in the solvent, preventing them from entering the subsequent fine filtration stage and scratching or clogging the filter membrane. The interception net 12 adopts a snap-fit ​​detachable design, which can be removed for cleaning or replacement without disassembling the entire filter.

[0020] Furthermore, a non-penetrating positioning groove 13 is provided at the center of the stepped surface of the end cap 1. One end of the filter element 9 is embedded in the positioning groove 13, and the other end of the filter element 9 is pressed by the filter housing 2. The filter element 9 is used to perform final deep purification of the solvent after fine filtration, further improving the filtration effect and ensuring that the purity of the effluent meets the experimental or production standards. The fact that one end of the filter element 9 is embedded in the non-penetrating positioning groove 13 on the stepped surface of the end cap, and the other end is pressed by the filter housing 2, not only ensures the positioning stability, but also prevents the solvent from leaking from the gap between the filter element 9 and the inner cylinder 22.

[0021] Furthermore, both the first filter element 7 and the second filter element 8 include a square frame and a filter membrane disposed within the square frame. The pore sizes of the interceptor mesh 12, the filter membrane of the first filter element 7, and the filter membrane of the second filter element 8 decrease sequentially. The filter membrane of the first filter element 7 has a relatively large pore size, which can initially filter out larger particles of impurities in the solvent, performing preliminary coarse filtration of the solvent. For example, the pore size of the first filter element 7 can be selected between 10 and 100 micrometers, depending on the actual application scenario and the approximate size range of the impurities to be filtered. The first filter element 7 can perform coarse filtration of the pretreated solvent, removing medium-sized impurities and reducing the pressure on the next stage of filtration. At the same time, the capacity of the first filtration zone is larger than that of the second filtration zone, which can temporarily store more impurities and extend the filtration cycle. The pore size of the second filter element 8 is significantly smaller than that of the filter membrane of the first filter element 7, and is used to further filter out smaller particles or microorganisms remaining in the solvent after treatment by the first filter element 7, achieving fine filtration of the solvent. For example, the pore size of the second filter membrane can be set between 0.1 and 0.45 micrometers to meet different filtration requirements. It can accurately filter tiny particulate impurities or microorganisms, and meet high-precision requirements such as sterile filtration in laboratories. The first filter element 7 and the second filter element 8 are distributed in a corresponding manner to ensure smooth solvent flow and avoid local accumulation.

[0022] Please see Figure 5 and Figure 6The intermediate cylinder 21 has a first slot 25 that connects the first purification zone and the second filtration zone, and the inner cylinder 22 has a second slot 26 that connects the second purification zone and the inner cavity of the inner cylinder 22.

[0023] Furthermore, the inner wall of the filter housing 2 and the outer wall of the intermediate cylinder 21 are provided with first rubber pads 23 for clamping the first filter element 7, and the inner wall of the intermediate cylinder 21 and the outer wall of the inner cylinder 22 are provided with second rubber pads 24 for clamping the second filter element 8. The first filter element 7 and the second filter element 8 are tightly clamped by the corresponding rubber pads, which not only ensures the sealing performance (preventing direct leakage of unfiltered solvent), but also allows for easy insertion and removal for replacement. When a filter element becomes clogged, it is only necessary to disassemble the connection between the end cap 1 and the filter housing 2, remove the filter element from the corresponding rubber pad, and replace it with a new filter element without touching other intact components. The rubber pads are made of elastic materials that are resistant to high temperature and chemical corrosion (suitable for sterilization environments and various solvents). When clamped, they rely on elastic deformation to tightly wrap the square frame of the filter element, preventing the filter element from shifting or the seal from failing.

[0024] Furthermore, a sealing ring 6 is provided between the end cap 1 and the flange of the filter housing 2, and is fixed by bolts 5. This ensures overall sealing (preventing solvent leakage) and allows for quick disassembly and assembly. When it is necessary to replace the interceptor 12, filter element or filter cartridge 9, the end cap 1 and filter housing 2 can be separated by loosening the bolts 5. The operation is convenient, and the sealing ring 6 can be replaced separately, reducing maintenance costs.

[0025] The working principle and usage process of this utility model are as follows: The raw water entering the end cover 1 through the inlet 3 enters the first filtration zone through the fan-shaped opening 11, and large particles of sediment are directly intercepted in the end cover 1 by the interception net 12. After the first filtration, the raw water enters the first purification zone after being filtered a second time by the first filter element 7, and then enters the second filtration zone through the first slot 25. After the second filtration, the raw water enters the second purification zone after being filtered a third time by the second filter element 8, and then enters the inner cylinder 22 through the second slot 26. After being finely filtered by the filter element 9, it is discharged through the outlet 4.

[0026] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A replaceable membrane filter, comprising an end cap (1) and a filter housing (2) sealed to the end cap (1), wherein the end of the end cap (1) away from the filter housing (2) is an inlet (3), and the end of the filter housing (2) away from the end cap (1) is an outlet (4), characterized in that, The filter housing (2) is fixed with a concentrically arranged intermediate cylinder (21) and inner cylinder (22). A plurality of first filter elements (7) are radially arranged between the intermediate cylinder (21) and the filter housing (2). A plurality of second filter elements (8) corresponding to the first filter elements (7) are arranged between the intermediate cylinder (21) and the inner cylinder (22). The plurality of first filter elements (7) divide the cavity between the intermediate cylinder (21) and the filter housing (2) to form alternating first filtration zone and first purification zone. The plurality of second filter elements (8) divide the cavity between the intermediate cylinder (21) and the inner cylinder (22) to form alternating second filtration zone and second purification zone. The raw water entering the end cap (1) from the inlet (3) passes through the first filtration zone, the first purification zone, the second filtration zone and the second purification zone in sequence before entering the inner cylinder (22). A filter element (9) is arranged in the inner cylinder (22).

2. The replaceable membrane filter of claim 1, wherein, The end face of the end cap (1) is a stepped surface, and a fan-shaped opening (11) communicating with the first filter area is provided through the stepped surface. An intercepting net (12) is provided in the fan-shaped opening (11).

3. The replaceable membrane filter of claim 2, wherein, The end cap (1) has a non-penetrating positioning groove (13) at the center of the stepped surface. One end of the filter element (9) is embedded in the positioning groove (13), and the other end of the filter element (9) is pressed by the filter housing (2).

4. The replaceable membrane filter of claim 2, wherein, Both the first filter element (7) and the second filter element (8) include a square frame and a filter membrane disposed within the square frame. The pore sizes of the interceptor mesh (12), the filter membrane of the first filter element (7), and the filter membrane of the second filter element (8) decrease sequentially.

5. The replaceable membrane filter of claim 1, wherein, The capacity of the first filtration zone is greater than that of the second filtration zone.

6. The replaceable membrane filter of claim 1, wherein, The intermediate cylinder (21) has a first slot (25) that connects the first purification zone and the second filtration zone.

7. The replaceable membrane filter according to claim 1, characterized in that, The inner cylinder (22) has a second slot (26) that allows the second purification zone to communicate with the inner cavity of the inner cylinder (22).

8. The replaceable membrane filter of claim 1, wherein, The inner wall of the filter housing (2) and the outer wall of the intermediate cylinder (21) are provided with a first rubber pad (23) for clamping the first filter element (7), and the inner wall of the intermediate cylinder (21) and the outer wall of the inner cylinder (22) are provided with a second rubber pad (24) for clamping the second filter element (8).

9. The replaceable membrane filter of claim 1, wherein, A sealing ring (6) is provided between the end cap (1) and the flange of the filter housing (2), and is fixed by bolts (5).

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