Chemical liquid filtering equipment capable of quickly replacing filter element

Abstract

The utility model provides chemical liquid filtering equipment capable of quickly replacing filter elements, which comprises a filtering tank, an annular seat is fixedly mounted at an opening of the filtering tank, a plurality of filter elements are detachably and fixedly mounted in the filtering tank through a support cylinder, the filter elements are connected with the support cylinder in a pluggable manner, and the annular seat is fixedly mounted on the annular seat. An opening end of the filter element is communicated with the interior of the filter tank, a liquid discharge pipe is fixedly mounted at the bottom of the filter tank and is communicated with the interior of the filter tank, a liquid inlet pipe is fixedly mounted on the annular seat and is communicated with the interior of the filter tank, and a sealing cover is detachably and fixedly mounted on the annular seat; according to the design, the overall and local maintenance requirements are considered: when the filter elements need to be replaced in batches, all the filter elements can be synchronously disassembled by disassembling the supporting cylinder, and one-by-one disassembly and assembly are avoided; if a single filter element is damaged, the filter element can be independently plugged and replaced, and the operation is flexible. And the supporting cylinder has an anti-deposition function and can be taken out together with bottom impurities during cleaning, so that the maintenance efficiency is remarkably improved.

Description

Technical Field

[0001] This utility model relates to the chemical industry, and in particular to a chemical liquid filtration device with a quick-replaceable filter element. Background Technology

[0002] Chemical liquid filtration equipment is an indispensable key piece of equipment in chemical production processes. Through mechanisms such as physical interception, adsorption separation, and deep filtration, it systematically removes solid particles, colloids, microorganisms, organic / inorganic pollutants, and sources of risk of loss of high-value components from liquid media. It plays an irreplaceable role in ensuring product purity, process stability, and production environment safety.

[0003] However, existing chemical liquid filtration equipment usually has multiple independent filter elements inside, which means that they need to be replaced one by one when needed, which is very troublesome. At the same time, it is not convenient to clean some impurities stuck at the bottom of the filter.

[0004] Therefore, it is essential to invent a chemical liquid filtration device with a quick-change filter element. Utility Model Content

[0005] To solve the above-mentioned technical problems, this utility model provides a chemical liquid filtration device with quick-replaceable filter elements. The technical solution is as follows: A chemical liquid filtration device with quick-replaceable filter elements includes a filter tank, wherein: an annular seat is fixedly installed at the opening of the filter tank; several filter elements are detachably and fixedly installed inside the filter tank via a support cylinder; the filter elements are plugged into and connected to the support cylinder; the opening end of the filter element communicates with the inside of the filter tank; a drain pipe is fixedly installed at the bottom of the filter tank and communicates with the inside of the filter tank; an inlet pipe is fixedly installed on the annular seat and communicates with the inside of the filter tank; and a sealing cap is detachably and fixedly installed on the annular seat.

[0006] The annular seat has a coaxially formed annular cavity and a threaded cavity, both of which are coaxially connected to the inside of the filter tank. The annular cavity is below the threaded cavity, the diameter of the threaded cavity is larger than the diameter of the annular cavity, and the diameter of the annular cavity is larger than the inner diameter of the filter tank opening.

[0007] Several L-shaped notches are evenly formed on the inner circumferential surface of the annular cavity of the ring seat;

[0008] The top of the support cylinder is an open structure, and the bottom of the support cylinder is a filter plate structure. An integral support edge is provided on the outer side of the open end of the support cylinder. A locking block corresponding to the L-shaped notch is provided on the outer circumferential surface of the support edge. The locking block is locked in the horizontal notch of the L-shaped notch through the vertical notch of the L-shaped notch. After the support cylinder is installed in place, the support edge is locked in the annular cavity.

[0009] The sealing cover includes an inner sealing cover and an outer sealing cover. The inner sealing cover is rotatably mounted on the bottom surface of the outer sealing cover. The inner sealing cover is plugged into and sealed with the annular cavity. The outer sealing cover is threadedly sealed with the threaded cavity.

[0010] The inner sealing cover is fixedly installed with a plate corresponding to the L-shaped notch, and the plate is inserted into the vertical notch corresponding to the L-shaped notch;

[0011] The bottom surface of the inner sealing cover has a positioning opening corresponding to the filter element;

[0012] After the inner sealing cover is installed in place, the closed end of each filter element is in the corresponding positioning port.

[0013] An integrated annular support platform is provided in the lower middle part of the filter tank. The upper surface of the annular support platform is in contact with the bottom surface of the support cylinder. The diameter of the annular support platform is the same as the diameter of the support cylinder, and the inner diameter of the annular support platform is the same as the inner diameter of the support cylinder.

[0014] A tube seat is fixedly installed on one side of the outer side of the annular seat. The tube seat is fixedly connected to the inlet pipe. An inlet is provided between the tube seat and the annular seat. The inlet is connected to the filter tank and the inlet pipe. The inlet is located above the support edge.

[0015] The bottom surface inside the support cylinder is evenly provided with several plug-in tube seats. The plug-in tube seats are connected to the inside of the filter tank and are plugged into one end of the corresponding filter element.

[0016] The inner surface of the insertion / removal socket has at least one sealing groove.

[0017] One end of the filter element is a closed structure, and the other end is an open structure. The open end of the filter element is provided with a plug, which is inserted into the corresponding plug-in socket.

[0018] An annular groove is provided between the filter element and the plug, and the annular groove is sealed on the outside of the plug-in tube seat. The end of the filter element with the plug is in contact with the bottom surface inside the support cylinder.

[0019] The plug is fitted with a sealing ring that corresponds to the sealing groove. After the plug is installed, the sealing ring is locked in the corresponding sealing groove.

[0020] The bottom surface of the sealing cover has an installation cavity, and the inner sealing cover is rotatably installed in the installation cavity via a bearing. The bottom surface of the sealing cover is provided with an external threaded ring corresponding to the threaded cavity, and the external threaded ring is threadedly sealed to the threaded cavity.

[0021] The outer sealing cover is fixedly installed with a force application handle.

[0022] Compared with the prior art, the advantages of this utility model are:

[0023] 1. The overall design of this utility model allows for easy removal of all filter elements when all filter elements need to be replaced later. Simply remove the support cylinder to remove the required filter elements at the same time, thus avoiding the hassle of replacing each filter element one by one.

[0024] 2. When a filter element is damaged and needs to be replaced individually, simply pull out that filter element and replace it, making the whole process more convenient and flexible;

[0025] 3. At the same time, the support cylinder can prevent impurities from being trapped at the bottom of the filter tank. When cleaning is required later, simply remove the support cylinder along with the impurities for easy cleaning. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0027] Figure 2 This is a schematic diagram of the full cross-section of this utility model.

[0028] Figure 3 This is a schematic diagram of the opening structure of the sealing cap of this utility model.

[0029] Figure 4 This is a schematic diagram of the structure for removing the support cylinder and filter element according to this utility model.

[0030] Figure 5 This is a schematic diagram of the annular seat structure of this utility model.

[0031] Figure 6 This is a schematic diagram of the structure of the filter element of this utility model being removed from inside the support cylinder.

[0032] Figure 7 This is a schematic diagram of the full cross-sectional structure of the support cylinder of this utility model.

[0033] Figure 8 This is a schematic diagram of the filter element structure of this utility model.

[0034] Figure 9 This is a schematic diagram of the inner sealing cap and outer sealing cap of this utility model.

[0035] Figure 10 This is a schematic diagram of the exploded structure of the inner sealing cap and the outer sealing cap of this utility model.

[0036] Figure 11 This is a partially enlarged structural diagram of point A of this utility model.

[0037] In the picture:

[0038] Filter tank 1, annular seat 2, annular cavity 21, threaded cavity 22, tube seat 23, L-shaped notch 24, liquid inlet 25, support cylinder 3, support edge 31, locking block 32, plug-in tube seat 33, sealing groove 34, filter element 4, plug 41, annular groove 42, sealing ring 43, annular support platform 5, inner sealing cover 6, positioning port 61, insert plate 62, outer sealing cover 7, mounting cavity 71, external threaded ring 72, drain pipe 8, liquid inlet pipe 9, force application handle 10. Detailed Implementation

[0039] To enable those skilled in the art to better understand the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.

[0040] In the description of the embodiments, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," and "the other end," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the present invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. In the description of the utility model, it should be noted that unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in the present utility model based on the specific circumstances.

[0041] The present invention will be further described below with reference to the accompanying drawings:

[0042] Example

[0043] Reference Figure 1-11A chemical liquid filtration device with quick-replacement filter element includes a filter tank 1, wherein: an annular seat 2 is fixedly installed at the opening of the filter tank 1 to support and limit the sealing cover and support cylinder 3; several filter elements 4 are detachably fixedly installed inside the filter tank 1 through the support cylinder 3 so that all filter elements 4 can be removed from the filter tank 1 at the same time through the support cylinder 3; the filter elements 4 are plugged and pulled to the support cylinder 3 so that the filter elements 4 can be disassembled and installed individually; a drain pipe 8 is fixedly installed at the bottom of the filter tank 1 and communicates with the inside of the filter tank 1 so that the chemical liquid filtered by the filter elements 4 can be discharged from the inside of the filter tank 1; an inlet pipe 9 is fixedly installed on the annular seat 2 and communicates with the inside of the filter tank 1 so that the chemical liquid to be filtered can be transported into the inside of the filter tank 1 through the inlet pipe 9; a sealing cover is detachably fixedly installed on the annular seat 2 so as to seal the opening of the filter tank 1 and facilitate the disassembly and assembly of the support cylinder 3 and the filter elements 4 in the future;

[0044] Specifically, when the filter element 4 is installed inside the filter canister 1 through the support cylinder 3, the end of the filter element 4 near the opening of the filter canister 1 is flush with the outer end of the annular seat 2.

[0045] The annular seat 2 has an annular cavity 21 and a threaded cavity 22 coaxially formed on it. Both the annular cavity 21 and the threaded cavity 22 are coaxially connected to the inside of the filter tank 1. The annular cavity 21 is below the threaded cavity 22. The diameter of the threaded cavity 22 is larger than the diameter of the annular cavity 21. The diameter of the annular cavity 21 is larger than the inner diameter of the opening of the filter tank 1. The annular cavity 21 can limit the opening end of the support cylinder 3 and provide installation space for the inner sealing cover 6. The threaded cavity 22 provides installation space for the outer sealing cover 7.

[0046] Several L-shaped notches 24 are evenly provided on the inner circumferential surface of the annular cavity 21 of the annular seat 2, so as to limit the support cylinder 3 through the L-shaped notches 24 and ensure the stability of the support cylinder 3 installed inside the filter tank 1.

[0047] The top of the support cylinder 3 is an open structure, and the bottom of the support cylinder 3 is a filter plate structure. This allows the filter plate structure to intercept precipitated impurities during the filtration process, preventing sediment buildup at the bottom of the filter tank 1. An integrated support edge 31 is provided on the outer side of the open end of the support cylinder 3. During installation, the support edge 31 supports and limits the support cylinder 3, securing it at the opening of the annular cavity 21 and the filter tank 1, ensuring the support cylinder 3 is properly installed. The outer circumferential surface of the support edge 31 is provided with... The locking block 32 corresponding to the L-shaped notch 24 is locked in the horizontal notch of the L-shaped notch 24 through the vertical notch of the L-shaped notch 24. The locking block 32 and the L-shaped notch 24 are designed to prevent the support cylinder 3 from accidentally coming out of the L-shaped notch 24 after installation. At the same time, this structure makes it easy to quickly remove the support cylinder 3 from the filter tank 1 later. After the support cylinder 3 is installed in place, the supporting edge 31 is locked in the annular cavity 21. A sealing gasket is provided between the supporting edge 31 and the annular cavity 21.

[0048] Specifically, the filter plate structure uses metal filter elements, such as stainless steel sintered filter elements (filtration accuracy 1-200μm) or titanium rod filter elements (pressure resistant 2MPa), which can withstand high oil temperature (150-200℃) and high pressure impact, and support backflushing regeneration;

[0049] The sealing cover includes an inner sealing cover 6 and an outer sealing cover 7, so as to achieve double sealing between the sealing cover and the annular seat 2. The inner sealing cover 6 is rotatably installed on the bottom surface of the outer sealing cover 7. The rotatable structure ensures that the connection between the outer sealing cover 7 and the threaded cavity 22 is not affected after the inner sealing cover 6 is installed in place. The inner sealing cover 6 and the annular cavity 21 are connected by a pull-in sealing connection. A sealing gasket is provided between the inner sealing cover 6 and the annular cavity 21. The outer sealing cover 7 and the threaded cavity 22 are connected by a threaded sealing connection.

[0050] An insert plate 62 corresponding to the L-shaped notch 24 is fixedly installed on the inner sealing cover 6. The insert plate 62 is inserted into the vertical notch of the corresponding L-shaped notch 24 so that after the inner sealing cover 6 is installed, the insert plate 62 can block the L-shaped notch 24 and further limit the locking block 32 to prevent the locking block 32 from accidentally coming out of the L-shaped notch 24, thereby ensuring the stability of the support cylinder 3 installed inside the filter tank 1. At the same time, this structure facilitates the quick separation of the inner sealing cover 6 from the annular seat 2.

[0051] The bottom surface of the inner sealing cover 6 is provided with a positioning port 61 corresponding to the filter element 4. After the inner sealing cover 6 is installed in place, the closed end of each filter element 4 is in the corresponding positioning port 61, so that each filter element 4 can be limited by the positioning port 61, so that each filter element 4 is firmly squeezed and fixed between the support cylinder 3 and the inner sealing cover 6, preventing each filter element 4 from accidentally separating from the support cylinder 3, and at the same time facilitating the separation between the inner sealing cover 6 and each filter element 4.

[0052] In this embodiment, an integrated annular support platform 5 is provided in the lower middle part of the filter tank 1. The upper surface of the annular support platform 5 is in contact with the bottom surface of the support cylinder 3. The diameter of the annular support platform 5 is the same as the diameter of the support cylinder 3, and the inner diameter of the annular support platform 5 is the same as the inner diameter of the support cylinder 3, so that the support cylinder 3 can be supported by the annular support platform 5, avoiding the weight of each filter element 4 and the pressure generated during the filtration process from being entirely applied to the support cylinder 3, while not affecting the filtration at the bottom of the support cylinder 3.

[0053] In this embodiment, a tube seat 23 is fixedly installed on one side of the outer side of the annular seat 2. The tube seat 23 is fixedly connected to the liquid inlet pipe 9. A liquid inlet 25 is opened between the tube seat 23 and the annular seat 2. The liquid inlet 25 is connected to the filter tank 1 and the liquid inlet pipe 9. The liquid inlet 25 is above the support edge 31 so that the chemical liquid that needs to be filtered can enter the support cylinder 3 from the opening of the support cylinder 3 and then be filtered through each filter element 4.

[0054] In this embodiment, several plug-in tube seats 33 are evenly arranged on the bottom surface inside the support cylinder 3. The plug-in tube seats 33 are connected to the inside of the filter tank 1. The plug-in tube seats 33 are plugged and inserted into one end of the corresponding filter element 4 so as to allow for individual disassembly and assembly of the filter element 4.

[0055] In this embodiment, one end of the filter element 4 is a closed structure and the other end is an open structure. The open end of the filter element 4 is provided with a plug 41. The plug 41 is inserted into the corresponding plug-in socket 33. After the plug 41 is inserted into the corresponding plug-in socket 33, they are in close contact to prevent leakage.

[0056] In this embodiment, an annular groove 42 is provided between the filter element 4 and the plug 41. The annular groove 42 is sealed and fitted outside the plug-in tube seat 33. One end of the filter element 4 with the plug 41 contacts the bottom surface inside the support cylinder 3. Through this structure, the plug 41 and the plug-in tube seat 33 can be sealed to prevent filtration leakage.

[0057] In this embodiment, the inner surface of the plug-in socket 33 is provided with at least one sealing groove 34, and the plug 41 is fitted with a sealing ring 43 corresponding to the sealing groove 34. After the plug 41 is installed in place, the sealing ring 43 is stuck in the corresponding sealing groove 34. This structure is designed to ensure the sealing between the plug 41 and the plug-in socket 33, and at the same time, to ensure the stability between the plug 41 and the plug-in socket 33, and to prevent them from accidentally separating.

[0058] In this embodiment, the bottom surface of the sealing cover 7 is provided with an installation cavity 71 to provide installation space for the inner sealing cover 6, thereby reducing the overall volume. The inner sealing cover 6 is rotatably installed in the installation cavity 71 by bearings to ensure the stability between the sealing cover 7 and the inner sealing cover 6, as well as the smoothness of rotation. The bottom surface of the sealing cover 7 is provided with an external threaded ring 72 corresponding to the threaded cavity 22, and the external threaded ring 72 is threadedly sealed to the threaded cavity 22.

[0059] In this embodiment, a force-applying handle 10 is fixedly installed on the outside of the outer sealing cover 7 so that the outer sealing cover 7 and the annular seat 2 can be disassembled by rotating the force-applying handle 10.

[0060] Specifically, for filtering mechanical impurities in chemical liquids, filter element type 4 needs to be selected based on the characteristics of the impurities, the properties of the liquid, and process requirements. The following is a detailed analysis and recommendations:

[0061] I. Criteria for Selecting Filter Cartridge Type

[0062] Impurity characteristics adaptability

[0063] High-precision interception: For microorganisms such as bacteria and bacteriophages larger than 0.2μm, absolute precision filter cartridges (such as PTFE pleated filter cartridges and polyethersulfone PES filter cartridges) are recommended, with a rejection efficiency of up to 10. 7 Grade 1, meeting pharmaceutical-grade sterility requirements.

[0064] Large particle pre-filtration: For visible particles (10-20μm) such as sand, gravel, and rust, wound filter cartridges or PP melt-blown filter cartridges are preferred. Their gradient pore structure can achieve deep filtration and extend the life of the final filter cartridge.

[0065] Corrosion-resistant applications: In the filtration of strong acids (such as hydrochloric acid and sulfuric acid), strong alkalis (sodium hydroxide) or organic solvents, PTFE hydrophobic filter elements or titanium rod filter elements are the first choice due to their corrosion resistance (titanium rods can withstand temperatures of 500-600℃).

[0066] Liquid chemical compatibility

[0067] Hydrophilic / hydrophobic matching: Aqueous solution filtration requires hydrophilic membranes (such as nylon, mixed cellulose ester MCE), while organic solvents require hydrophobic membranes (such as PVDF, PTFE) to avoid membrane swelling or dissolution.

[0068] Low adsorption requirements: Filtration of high value-added products (such as antibodies and collagen) requires low protein adsorption filter materials (such as modified PES and PVDF) to reduce the loss of effective ingredients.

[0069] Process compatibility

[0070] High pressure and high temperature conditions: High-temperature steam sterilization (121-134℃) requires high-temperature resistant filter elements (such as titanium sintered filter elements at 280℃, stainless steel filter elements at 200℃), and high-pressure reverse osmosis (0.42-0.6MPa) requires high-strength filter media.

[0071] High flow rate requirements: Filtration of high-viscosity liquids (such as lubricating oil) requires high-flow filter elements (such as high-flow pleated filter elements), with a single element flow rate of 1-10 m³ / h. 3 / h, reducing system pressure differential.

[0072] II. Filter Cartridge Recommendations for Typical Scenarios

[0073] Lubricating oil / hydraulic oil filtration

[0074] Metal filter element: Sintered stainless steel filter element (filtration accuracy 1-200μm) or titanium rod filter element (pressure resistant 2MPa), which can withstand high temperature (150-200℃) and high pressure impact of oil, and supports backflushing regeneration.

[0075] Glass fiber filter cartridges: designed for small particles such as iron oxide and rust, their high dirt holding capacity (up to 500g per cartridge) can extend maintenance cycles.

[0076] Solvent recovery / organic synthesis

[0077] PTFE pleated filter cartridge: Excellent hydrophobicity, resistant to strong acids and alkalis (pH 0-14), suitable for filtering solvents such as toluene and DMF, and can be steam sterilized.

[0078] Ceramic filter element: Dual-control membrane ceramic filter element (average pore size 0.1μm) is suitable for high-temperature solvent (300℃) filtration and has a lifespan of up to 2000 hours.

[0079] Fermentation broth / biopharmaceuticals

[0080] PES sterilization filter cartridge: Excellent hydrophilicity, low protein adsorption rate (<5μg / cm³). 2 It is suitable for sterilization and filtration of cell culture media and buffer solutions.

[0081] PVDF hollow fiber filter cartridge: high-flux design (single cartridge flow rate 100-500L / min), suitable for large-scale fermentation broth clarification.

[0082] Electronic grade chemicals

[0083] Perfluorinated filter element: Made of PFA material, resistant to extreme solvents such as aqua regia and hydrofluoric acid, with metal ion precipitation of <0.01ppb, meeting the ultrapure water requirements of the semiconductor industry.

[0084] Nuclear pore membrane filter element: pore size uniformity ≤5%, suitable for filtering high-purity liquids such as photoresist and electronic specialty gases.

[0085] Specifically, during use, unfiltered chemical liquid is transported to the support cylinder 3 inside the filter tank 1 through the inlet pipe 9 and the inlet port 25, and filtered through each filter element 4. The filtered chemical liquid enters the filter tank 1 through the plug-in seat 33 and is finally discharged through the drain pipe 8.

[0086] When all the filter elements 4 need to be replaced later, first turn the outer sealing cover 7 counterclockwise by the handle 10 to separate the outer sealing cover 7 and the inner sealing cover 6 from the annular seat 2, so that the support cylinder 3 and the filter element 4 can be exposed.

[0087] At this point, rotate the support cylinder 3 clockwise to move the locking block 32 from the horizontal notch of the L-shaped notch 24 to the vertical notch of the L-shaped notch 24. Then lift the support cylinder 3 to remove all the filter elements 4 from the inside of the filter canister 1. The filter plate at the bottom of the support cylinder 3 will carry out the sediment generated during the filtration process, preventing the sediment from accumulating on the bottom surface inside the filter canister 1. After removing the filter elements, install the support cylinder 3 containing the new filter elements 4 inside the filter canister 1 and cover it with the sealing cap.

[0088] When a single filter element 4 needs to be replaced, simply open the sealing cover, lift up the filter element 4 that needs to be replaced, and remove the filter element 4 from the support cylinder 3. Then insert a new filter element 4.

[0089] Any technical solution that achieves the above-mentioned technical effects by utilizing the technical solution described in this utility model, or by designing a similar technical solution inspired by the technical solution described in this utility model, falls within the protection scope of this utility model.

Claims

1. A chemical liquid filtration device with a quickly replaceable filter element, characterized in that: The filter includes a filter canister (1), wherein: an annular seat (2) is fixedly installed at the opening of the filter canister (1); several filter elements (4) are detachably and fixedly installed inside the filter canister (1) via a support cylinder (3); the filter elements (4) are plugged into the support cylinder (3); the opening end of the filter element (4) is connected to the inside of the filter canister (1); a drain pipe (8) is fixedly installed at the bottom of the filter canister (1); the drain pipe (8) is connected to the inside of the filter canister (1); an inlet pipe (9) is fixedly installed on the annular seat (2); the inlet pipe (9) is connected to the inside of the filter canister (1); and a sealing cover is detachably and fixedly installed on the annular seat (2). The annular seat (2) has an annular cavity (21) and a threaded cavity (22) coaxially formed on it. The annular cavity (21) and the threaded cavity (22) are coaxially connected to the inside of the filter tank (1). The annular cavity (21) is below the threaded cavity (22). The annular seat (2) has several L-shaped notches (24) evenly opened on the inner circumferential surface of the annular cavity (21); The top of the support cylinder (3) is an open structure, and the bottom of the support cylinder (3) is a filter plate structure. An integral support edge (31) is provided on the outer side of the open end of the support cylinder (3). A locking block (32) corresponding to the L-shaped notch (24) is provided on the outer circumferential surface of the support edge (31). The locking block (32) is locked in the horizontal notch of the L-shaped notch (24) through the vertical notch of the L-shaped notch (24). After the support cylinder (3) is installed in place, the support edge (31) is locked in the annular cavity (21). The sealing cover includes an inner sealing cover (6) and an outer sealing cover (7). The inner sealing cover (6) is rotatably mounted on the bottom surface of the outer sealing cover (7). The inner sealing cover (6) is plugged and sealed with the annular cavity (21). The outer sealing cover (7) is threaded and sealed with the threaded cavity (22). An insert plate (62) corresponding to the L-shaped notch (24) is fixedly installed on the inner sealing cover (6), and the insert plate (62) is inserted into the vertical notch corresponding to the L-shaped notch (24); The bottom surface of the inner sealing cover (6) is provided with a positioning port (61) corresponding to the filter element (4); After the inner sealing cover (6) is installed in place, the closed end of each filter element (4) is in the corresponding positioning port (61).

2. The chemical liquid filtration device with a quickly replaceable filter element as described in claim 1, characterized in that: An integrated annular support platform (5) is provided in the lower middle part of the filter tank (1), and the upper surface of the annular support platform (5) is in contact with the bottom surface of the support cylinder (3).

3. A chemical liquid filtration device with a quickly replaceable filter element as described in claim 1, characterized in that: A tube seat (23) is fixedly installed on one side of the outer side of the annular seat (2). The tube seat (23) is fixedly connected to the liquid inlet pipe (9). A liquid inlet (25) is opened between the tube seat (23) and the annular seat (2). The liquid inlet (25) is connected to the filter tank (1) and the liquid inlet pipe (9). The liquid inlet (25) is above the support edge (31).

4. A chemical liquid filtration device with a quickly replaceable filter element as described in claim 1, characterized in that: The bottom surface inside the support cylinder (3) is uniformly provided with a number of plug-in tube seats (33). The plug-in tube seats (33) are connected to the inside of the filter tank (1). The plug-in tube seats (33) are plugged into one end of the corresponding filter element (4).

5. A chemical liquid filtration device with a quickly replaceable filter element as described in claim 4, characterized in that: The inner surface of the insertion / removal socket (33) has at least one sealing groove (34).

6. A chemical liquid filtration device with a quickly replaceable filter element as described in claim 5, characterized in that: One end of the filter element (4) is a closed structure and the other end is an open structure. The open end of the filter element (4) is provided with a plug (41), which is inserted into the corresponding plug-in socket (33).

7. A chemical liquid filtration device with a quickly replaceable filter element as described in claim 6, characterized in that: An annular groove (42) is provided between the filter element (4) and the plug (41). The annular groove (42) is sealed on the outside of the plug-in tube seat (33). The end of the filter element (4) with the plug (41) is in contact with the bottom surface inside the support cylinder (3).

8. A chemical liquid filtration device with a quickly replaceable filter element as described in claim 7, characterized in that: The plug (41) is fitted with a sealing ring (43) that corresponds to the sealing groove (34). After the plug (41) is installed in place, the sealing ring (43) is stuck in the corresponding sealing groove (34).

9. A chemical liquid filtration device with a quickly replaceable filter element as described in claim 1, characterized in that: The bottom surface of the sealing cover (7) is provided with an installation cavity (71). The inner sealing cover (6) is rotatably installed in the installation cavity (71) through a bearing. The bottom surface of the sealing cover (7) is provided with an external threaded ring (72) corresponding to the threaded cavity (22). The external threaded ring (72) is threadedly sealed to the threaded cavity (22).

10. A chemical liquid filtration device with a quickly replaceable filter element as described in claim 9, characterized in that: The outer sealing cover (7) is fixedly installed with a force application handle (10).

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