Detachable activated carbon filter element of air purifier

The detachable bolt connection and sealing components solve the problem of difficult replacement caused by the adhesive bonding between the cylindrical activated carbon filter and the air purifier frame, achieving convenient filter replacement and ensuring sealing.

CN223683242UActive Publication Date: 2025-12-19DALIAN UNIV OF TECH
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Patent Information

Application Number
CN202520029081.1
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2025-01-07
Publication Date
2025-12-19
Estimated Expiration
2035-01-07

AI Technical Summary

Technical Problem

The cylindrical activated carbon filter is fixed to the air purifier frame with an adhesive, which enhances the seal but increases the difficulty of replacing the filter.

Method used

The design employs a detachable system, utilizing bolted connections and removable sealing components, including a first frame plate assembly, an inner cylinder assembly, and a sealing assembly, to achieve a detachable seal between the filter element and the device, preventing adhesive adhesion.

Benefits of technology

It improves the convenience of filter replacement and the sealing of the device after replacement, ensuring the purification efficiency of the air purifier and simplifying the filter replacement process.

✦ Generated by Eureka AI based on patent content.

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Patent Text Reader

Abstract

The utility model relates to the technical field of activated carbon filter elements, in particular to a detachable air purifier activated carbon filter element which comprises a filter screen cylinder, an activated carbon folding filter, a first frame plate assembly and a second frame plate assembly. The inner side of the lower end of the filter screen cylinder is fixedly connected with a second frame plate assembly through bolts, the inner side of the filter screen cylinder is sleeved with an activated carbon folding filter, the bottom end of the first frame plate assembly is fixedly connected with a first sealing assembly, the bottom end of the first frame plate assembly is fixedly connected with a built-in cylinder assembly, and the top end of the second frame plate assembly is fixedly connected with a second sealing assembly; the first frame plate assembly comprises a cover plate, an inner hollow groove is formed in the inner side of the cover plate, the device is provided with a detachable structure, sealing between the filter element activated carbon folding filter and the device can be achieved under the condition that glue is not used for bonding, and convenience is improved when the filter element is replaced.
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Description

TECHNICAL FIELD

[0001] The utility model relates to active carbon filter element technical field, concretely is a detachable air purifier active carbon filter element. BACKGROUND

[0002] Air purifier active carbon filter element is a kind of filter material specially designed to remove harmful gases and odors in indoor air, it is mainly composed of active carbon, active carbon is a kind of porous structure material with high adsorption, can remove organic compounds, formaldehyde, benzene series material, bacteria and other harmful substances in air by physical adsorption and chemical adsorption;

[0003] With the increase of use time, active carbon filter element will adsorb more and more pollutants, eventually reach saturation state, at this time, in order to maintain the purification effect of air purifier, active carbon filter element needs to be replaced regularly, disassembling filter element user can replace saturated filter element, to maintain the efficiency of air purifier;

[0004] Cylindrical active carbon filter element usually refers to cylindrical active carbon filter unit, this design helps to increase the surface area in contact with air, so as to improve air flow rate and filtration efficiency, for cylindrical active carbon filter element, they are usually installed on air purifier frame body, when active carbon filter element needs to be replaced or maintained, filter element and frame body are bonded by colloid to ensure sealing, this method although enhances the fixation of filter element, but also correspondingly increases the operation difficulty when replacing filter element, therefore, aiming at the above problems, a detachable air purifier active carbon filter element is provided. UTILITY MODEL CONTENTS

[0005] The utility model aims at providing a kind of detachable air purifier active carbon filter element, to solve the problem that filter element and frame body are bonded by colloid to ensure sealing, this method although enhances the fixation of filter element, but also correspondingly increases the operation difficulty when replacing filter element.

[0006] To achieve the above object, the utility model provides the following technical scheme:

[0007] The utility model provides a detachable air purifier active carbon filter element, including filter screen cylinder, active carbon folding filter, first shelf plate subassembly and second shelf plate subassembly, the inside of filter screen cylinder upper end is fixedly connected with first shelf plate subassembly through bolt, the inside of filter screen cylinder lower extreme is fixedly connected with second shelf plate subassembly through bolt, the inside of filter screen cylinder is equipped with active carbon folding filter, first seal assembly is fixedly connected with the bottom of first shelf plate subassembly, built -in cylinder subassembly is fixedly connected with the bottom of first shelf plate subassembly, second seal assembly is fixedly connected with the top of second shelf plate subassembly, the first shelf plate subassembly includes cover, the inside of cover is equipped with empty slot, the inside of cover is equipped with air outlet guide hole and air inlet guide hole close to empty slot lower end, the inside of cover is equipped with purification gas hole, the inside of purification gas hole that cover is equipped is fixedly connected with sleeve ring, the inside of cover is equipped with reserved screw hole close to filter screen cylinder bolt, built -in cylinder subassembly includes cylinder shell, the inside of cylinder shell is fixedly connected with middle support board, the outside of middle support board is fixedly connected with spring, one end of spring is fixedly connected with double cylinder column, the inside of double cylinder column is equipped with flow channel, the outside of double cylinder column is fixedly connected with rubber ring, first seal assembly includes first seal air bag and second seal air bag, the inside of first seal air bag is equipped with first inflation groove, the upper end of first seal air bag is equipped with first connector, the inside of second seal air bag is equipped with second inflation groove, the upper end of second seal air bag is equipped with second connector, the upper end of filter screen cylinder is fixedly connected with cover through bolt, the bottom of cover is fixedly connected with the top of double cylinder column, the bottom of cover is fixedly connected with the top of first seal air bag.

[0008] As the further optimization of the utility model, the inside of the upper end and the inside of the lower end of the filter screen cylinder are provided with bolts, the bolts of the filter screen cylinder are installed inside the reserved screw holes, the inside of the filter screen cylinder is in close contact with the outside of the cover, and the inside of the filter screen cylinder is in close contact with the outside of the second shelf plate subassembly.

[0009] As the further optimization of the utility model, the air inlet guide hole and the air outlet guide hole penetrate the lower end of the cover, the air inlet guide hole, the empty slot and the air outlet guide hole are communicated, the purification gas hole penetrates the inside of the cover from top to bottom, the number of the purification gas holes is the same as the number of the sleeve rings, the inside of the sleeve ring is hollow, and a plurality of air outlet guide holes are arranged.

[0010] As the further optimization of the utility model, the flow channel of the double cylinder column is communicated with the air inlet guide hole, the flow channel penetrates the inside of the double cylinder column from top to bottom, the inside of the cylinder shell is hollow, the inside of the cylinder shell is communicated with the flow channel of the double cylinder column, the upper end and the lower end of the cylinder shell are penetration structures, the shape of the double cylinder column is two cylinder bodies, the double cylinder column is slidingly connected to the inside of the cylinder shell, and the outside of the rubber ring is attached to the inside of the cylinder shell.

[0011] As a further optimization of this utility model, the number of the double cylindrical columns and springs are both two, the top and bottom of the middle support plate are fixed with springs, and the bottom of the lower double cylindrical column is fixedly connected to the top of the second frame assembly.

[0012] As a further optimization of this utility model, the top end of the second sealing airbag is fixedly connected to the bottom end of the cover plate, the first inflation groove is connected to the first interface, the first interface passes through the upper end of the first sealing airbag, the first interface of the first sealing airbag is connected to the air outlet hole of the cover plate, the second inflation groove is connected to the second interface, the second interface of the second sealing airbag is connected to the air outlet hole of the cover plate, and the structure of the first sealing component is the same as the structure of the second sealing component.

[0013] As a further optimization of this utility model, a gap is provided between the first sealing airbag and the second sealing airbag, and the activated carbon pleated filter is installed inside the gap between the first sealing airbag and the second sealing airbag. The outer side of the activated carbon pleated filter is in close contact with the inner side of the first sealing airbag, and the inner side of the activated carbon pleated filter is in close contact with the outer side of the second sealing airbag.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] In this invention, by setting a first frame plate assembly, an inner cylinder assembly, and a first sealing assembly, the device, through its detachable structure design, can achieve a seal between the activated carbon pleated filter and the device without using adhesive bonding, improving the convenience of filter replacement and ensuring the sealing performance after replacement. This design not only makes it convenient for users to replace saturated filter elements, but also ensures that the air purifier can maintain its purification efficiency after filter replacement. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0017] Figure 2 This is a cross-sectional structural diagram of the filter screen cylinder of this utility model;

[0018] Figure 3 This is an exploded structural diagram of the entire utility model;

[0019] Figure 4 This is a schematic diagram of the first frame assembly structure of this utility model;

[0020] Figure 5 This is a schematic diagram of the structure of the first sealing component of this utility model;

[0021] Figure 6 This is a schematic diagram of the built-in cylinder assembly structure of this utility model.

[0022] Figure: 1, filter screen cylinder; 2, activated carbon folding filter;

[0023] 3, the first shelf plate assembly; 31, cover plate; 32, inner hollow groove; 33, gas outlet guide hole; 34, air inlet guide hole; 35, purified gas hole; 36, collar; 37, reserved screw hole;

[0024] 4, the built-in cylinder assembly; 41, cylinder shell; 42, middle support plate; 43, spring; 44, double cylinder column; 45, flow channel; 46, rubber ring;

[0025] 5, the first sealing assembly; 51, the first sealing air bag; 52, the second sealing air bag; 53, the first inflation groove; 54, the first interface; 55, the second inflation groove; 56, the second interface;

[0026] 6, the second sealing assembly; 7, the second shelf plate assembly. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0028] It should be noted that the terms used herein are only intended to describe specific embodiments, and are not intended to limit the exemplary embodiments according to the present application. As used herein, the singular form is intended to include the plural form unless the context clearly indicates otherwise, and furthermore, it should be understood that when the terms "comprise" and / or "include" are used in the specification, there is a feature, step, operation, device, component and / or combination thereof.

[0029] Please refer to Figures 1-6 The present application provides a technical scheme:

[0030] The utility model provides a detachable air purifier active carbon filter element, including filter screen cylinder 1, active carbon folding filter 2, first shelf plate assembly 3 and second shelf plate assembly 7, the inside of filter screen cylinder 1 upper end is fixedly connected with first shelf plate assembly 3 through bolt, the inside of filter screen cylinder 1 lower end is fixedly connected with second shelf plate assembly 7 through bolt, the inside of filter screen cylinder 1 is equipped with active carbon folding filter 2, first shelf plate assembly 3 bottom is fixedly connected with first sealing assembly 5, first shelf plate assembly 3 bottom is fixedly connected with built-in cylinder assembly 4, second shelf plate assembly 7 top is fixedly connected with second sealing assembly 6, first shelf plate assembly 3 includes cover plate 31, the inside of cover plate 31 is equipped with empty slot 32, the inside of cover plate 31 near empty slot 32 lower end is equipped with gas outlet guide hole 33 and air inlet guide hole 34, the inside of cover plate 31 is equipped with purification gas hole 35, the inside of cover plate 31 is equipped with lantern ring 36, the inside of cover plate 31 is equipped with reserved screw hole 37 near filter screen cylinder 1 bolt, built-in cylinder assembly 4 includes cylinder shell 41, the inside of cylinder shell 41 is fixedly connected with middle support plate 42, the outside of middle support plate 42 is fixedly connected with spring 43, one end of spring 43 is fixedly connected with double cylinder column 44, the inside of double cylinder column 44 is equipped with flow channel 45, the outside of double cylinder column 44 is fixedly connected with rubber ring 46, first sealing assembly 5 includes first sealing air bag 51 and second sealing air bag 52, the inside of first sealing air bag 51 is equipped with first inflation groove 53, the upper end of first sealing air bag 51 is equipped with first interface 54, the inside of second sealing air bag 52 is equipped with second inflation groove 55, the upper end of second sealing air bag 52 is equipped with second interface 56, the upper end of filter screen cylinder 1 is fixedly connected with cover plate 31 through bolt, the bottom of cover plate 31 is fixedly connected with the top of double cylinder column 44, the bottom of cover plate 31 is fixedly connected with the top of first sealing air bag 51.

[0031] As further implementation of the scheme, the inside of filter screen cylinder 1 upper end and the inside of lower end are all equipped with bolt, the bolt of filter screen cylinder 1 is installed inside reserved screw hole 37, the inside of filter screen cylinder 1 is close to the outside of cover plate 31, the inside of filter screen cylinder 1 is close to the outside of second shelf plate assembly 7, the position between first shelf plate assembly 3 and second shelf plate assembly 7 is fixed conveniently,

[0032] As further implementation of the scheme, air inlet guide hole 34 and gas outlet guide hole 33 all penetrate the lower end of cover plate 31, air inlet guide hole 34, empty slot 32 and gas outlet guide hole 33 are communicated, purification gas hole 35 penetrates the inside of cover plate 31 up and down, the number of purification gas hole 35 is same with the number of lantern ring 36, the inside of lantern ring 36 is hollow, the number of gas outlet guide hole 33 is set to be multiple, the gas in the inside of built-in cylinder assembly 4 is convenient to enter the inside of first shelf plate assembly 3, and is distributed to the inside of first sealing air bag 51 and second sealing air bag 52 through first shelf plate assembly 3;

[0033] As a further implementation of the present scheme, the flow channel 45 opened in the double-cylinder column 44 is in communication with the air inlet guide hole 34, the flow channel 45 penetrates the inner side of the double-cylinder column 44 up and down, the inner side of the cylinder shell 41 is hollow, the inner side of the cylinder shell 41 is in communication with the flow channel 45 opened in the double-cylinder column 44, the upper end and the lower end of the cylinder shell 41 are both penetrating structures, the shape of the double-cylinder column 44 is two cylindrical bodies, the double-cylinder column 44 is slidingly connected to the inner side of the cylinder shell 41, the outer side of the rubber ring 46 is attached to the inner side of the cylinder shell 41, the number of the double-cylinder column 44 and the spring 43 is both two, the top end and the bottom end of the middle support plate 42 are both fixed with the spring 43, the bottom end of the lower double-cylinder column 44 is fixedly connected to the top end of the second shelf plate assembly 7, and the built-in cylinder assembly 4 is extruded by the first shelf plate assembly 3 and the second shelf plate assembly 7, so that the gas in the built-in cylinder assembly 4 moves out and enters the interiors of the first shelf plate assembly 3 and the second shelf plate assembly 7, respectively. This operation mode improves the convenience of installation, and the thrust of the built-in cylinder assembly 4 can move the first shelf plate assembly 3 and the second shelf plate assembly 7 at the same time, improving the efficiency of disassembly.

[0034] As a further implementation of the present scheme, the top end of the second sealing air bag 52 is fixedly connected to the bottom end of the cover plate 31, the first inflation groove 53 is in communication with the first interface 54, the first interface 54 penetrates the upper end of the first sealing air bag 51, the first interface 54 opened in the first sealing air bag 51 is in communication with the air outlet guide hole 33 opened in the cover plate 31, the second inflation groove 55 is in communication with the second interface 56, the second interface 56 opened in the second sealing air bag 52 is in communication with the air outlet guide hole 33 opened in the cover plate 31, the structure of the first sealing assembly 5 is the same as that of the second sealing assembly 6, there is a gap between the first sealing air bag 51 and the second sealing air bag 52, the activated carbon folding filter 2 is installed in the gap between the first sealing air bag 51 and the second sealing air bag 52, the outer side of the activated carbon folding filter 2 is tightly attached to the inner side of the first sealing air bag 51, and the inner side of the activated carbon folding filter 2 is tightly attached to the outer side of the second sealing air bag 52. After the gas in the first shelf plate assembly 3 enters the interiors of the second sealing assembly 6, the first sealing air bag 51 and the second sealing air bag 52, the sealing between the activated carbon folding filter 2 and the device is realized under the inflation of the second sealing assembly 6, the first sealing air bag 51 and the second sealing air bag 52. This sealing mode improves the convenience of installation and ensures the sealing performance after installation, and facilitates the disassembly of the activated carbon folding filter 2 later.

[0035] Work flow: when the active carbon folding filter 2 is installed while ensuring the sealing after installation, the active carbon folding filter 2 is properly expanded and then sleeved from the outside of the first shelf plate assembly 3 and the first sealing assembly 5, when the active carbon folding filter 2 is between the first sealing assembly 5 and the second sealing assembly 6, the upper end of the active carbon folding filter 2 is inserted into the gap between the first sealing air bag 51 and the second sealing air bag 52, the second shelf plate assembly 7 and the first shelf plate assembly 3 are pressed towards the direction of the cylinder assembly 4 at the same time, at this time the cover plate 31 drives the double cylinder column 44 to move to the inside of the cylinder shell 41, the double cylinder column 44 slides on the inside of the cylinder shell 41, the double cylinder column 44 extrudes the spring 43, under the action of the elasticity of the spring 43, the two double cylinder columns 44 can move towards the outside of the cylinder shell 41, at the same time, under the action of the elasticity of the spring 43, it is convenient to disassemble the active carbon folding filter 2 later, in the process of moving the double cylinder column 44, the gas in the inside of the cylinder shell 41 enters the inside of the air inlet guide hole 34 from the flow channel 45, then enters the inside of the inner hollow groove 32 and the air outlet guide hole 33 from the air inlet guide hole 34, and then enters the inside of the first interface 54 and the second interface 56 respectively from the air outlet guide hole 33, at this time the first inflation groove 53 opened by the first sealing air bag 51 and the second inflation groove 55 opened by the second sealing air bag 52 are full of gas, at this time the second sealing air bag 52 and the first sealing air bag 51 expand respectively, so that the first sealing air bag 51, the second sealing air bag 52 are tightly attached to the active carbon folding filter 2, realizing the sealing effect, then the active carbon folding filter 2 is inserted into the gap inside the second sealing assembly 6 in the same way as the above operation, so that the second sealing assembly 6 seals the lower end of the active carbon folding filter 2, the structure of the second shelf plate assembly 7 is the same as that of the first shelf plate assembly 3 except for the structure of the purification gas hole 35 and the sleeve ring 36 of the first shelf plate assembly 3, the second shelf plate assembly 7 can be inflated inside the second sealing assembly 6, then the filter screen cylinder 1 is sleeved on the outside of the whole, the filter screen cylinder 1 is fixed with the cover plate 31 through the bolts of the filter screen cylinder 1, and then the filter screen cylinder 1 is fixed with the second shelf plate assembly 7, the detachable structure of the device can replace the active carbon folding filter 2 to maintain the efficiency of the air purifier, and the active carbon folding filter 2 and the device can be sealed without the need for colloid bonding, which improves the convenience of replacing the active carbon folding filter 2 and ensures the sealing performance of the device after replacement. When filtering gas, the external gas contacts the active carbon folding filter 2 through the pores of the filter screen cylinder 1, the filter screen cylinder 1 filters large particles of impurities, and the purified air is inside the active carbon folding filter 2, which flows out through the sleeve ring 36 fixed inside the purification gas hole 35, thereby realizing the air purification work.

[0036] Although the embodiments of the present application have been shown and described, it is to be understood that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present application, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A detachable active carbon filter cartridge for air purifier, comprising a filter screen cylinder (1), an active carbon folded filter (2), a first shelf plate assembly (3) and a second shelf plate assembly (7), characterized in that: The inner side of the upper end of the filter screen cylinder (1) is fixedly connected with the first frame plate assembly (3) through bolts, the inner side of the lower end of the filter screen cylinder (1) is fixedly connected with the second frame plate assembly (7) through bolts, the inner side of the filter screen cylinder (1) is sleeved with the activated carbon folding filter (2), the bottom end of the first frame plate assembly (3) is fixedly connected with the first sealing assembly (5), the bottom end of the first frame plate assembly (3) is fixedly connected with the built-in cylinder assembly (4), and the top end of the second frame plate assembly (7) is fixedly connected with the second sealing assembly (6). The first frame plate assembly (3) comprises a cover plate (31), the inner side of the cover plate (31) is provided with an inner hollow groove (32), the inner side of the cover plate (31) close to the lower end of the inner hollow groove (32) is provided with an air outlet guide hole (33) and an air inlet guide hole (34), the inner side of the cover plate (31) is provided with a purified gas hole (35), the inner side of the purified gas hole (35) provided in the cover plate (31) is fixedly connected with a sleeve ring (36), the inner side of the cover plate (31) close to the bolt of the filter screen cylinder (1) is provided with a reserved screw hole (37), the built-in cylinder assembly (4) comprises a cylinder shell (41), the inner side of the cylinder shell (41) is fixedly connected with a middle support plate (42), the outer side of the middle support plate (42) is fixedly connected with a spring (43), one end of the spring (43) is fixedly connected with a double cylinder column (44), the inner side of the double cylinder column (44) is provided with a flow channel (45), the outer side of the double cylinder column (44) is fixedly connected with a rubber ring (46), the first sealing assembly (5) comprises a first sealing air bag (51) and a second sealing air bag (52), the inner side of the first sealing air bag (51) is provided with a first inflation groove (53), the upper end of the first sealing air bag (51) is provided with a first interface (54), the inner side of the second sealing air bag (52) is provided with a second inflation groove (55), and the upper end of the second sealing air bag (52) is provided with a second interface (56). The upper end of the filter screen cylinder (1) is fixedly connected with the cover plate (31) through bolts, the bottom end of the cover plate (31) is fixedly connected with the top end of the double cylinder column (44), and the bottom end of the cover plate (31) is fixedly connected with the top end of the first sealing air bag (51).

2. The detachable active carbon filter cartridge of claim 1, wherein: The inner side of the upper end and the inner side of the lower end of the filter screen cylinder (1) are provided with bolts, the bolts of the filter screen cylinder (1) are installed in the inside of the reserved screw hole (37), the inner side of the filter screen cylinder (1) is close to the outer side of the cover plate (31), and the inner side of the filter screen cylinder (1) is close to the outer side of the second frame plate assembly (7).

3. The detachable active carbon filter cartridge of claim 1, wherein: The air inlet guide hole (34) and the air outlet guide hole (33) penetrate through the lower end of the cover plate (31), the air inlet guide hole (34), the inner hollow groove (32) and the air outlet guide hole (33) are communicated, the purified gas hole (35) penetrates through the inner side of the cover plate (31) up and down, the number of the purified gas hole (35) is the same as that of the sleeve ring (36), the inner side of the sleeve ring (36) is hollow, and the number of the air outlet guide hole (33) is provided to be multiple.

4. The separable activated carbon filter cartridge of claim 1, wherein: The double-cylinder column (44) is provided with a flow channel (45) in communication with the air inlet guide hole (34), the flow channel (45) penetrates the inner side of the double-cylinder column (44) from top to bottom, the inner side of the cylinder shell (41) is hollow, the inner side of the cylinder shell (41) is in communication with the flow channel (45) of the double-cylinder column (44), the upper end and the lower end of the cylinder shell (41) are both penetrating structures, the shape of the double-cylinder column (44) is two cylindrical bodies, the double-cylinder column (44) is slidingly connected to the inner side of the cylinder shell (41), and the outer side of the rubber ring (46) is attached to the inner side of the cylinder shell (41).

5. The separable activated carbon filter cartridge of claim 1, wherein: The number of the double-cylinder column (44) and the spring (43) is two, the top end and the bottom end of the middle support plate (42) are fixed with the spring (43), and the bottom end of the double-cylinder column (44) is fixedly connected to the top end of the second frame plate assembly (7).

6. The separable activated carbon filter cartridge of claim 1, wherein: The top end of the second sealing air bag (52) is fixedly connected to the bottom end of the cover plate (31), the first inflation groove (53) is in communication with the first interface (54), the first interface (54) penetrates the upper end of the first sealing air bag (51), the first interface (54) of the first sealing air bag (51) is in communication with the air outlet guide hole (33) of the cover plate (31), the second inflation groove (55) is in communication with the second interface (56), the second interface (56) of the second sealing air bag (52) is in communication with the air outlet guide hole (33) of the cover plate (31), and the structure of the first sealing assembly (5) is the same as that of the second sealing assembly (6).

7. The separable activated carbon filter cartridge of claim 1, wherein: The first sealing air bag (51) and the second sealing air bag (52) are provided with a gap, the activated carbon folding filter (2) is installed in the gap between the first sealing air bag (51) and the second sealing air bag (52), the outer side of the activated carbon folding filter (2) is attached to the inner side of the first sealing air bag (51), and the inner side of the activated carbon folding filter (2) is attached to the outer side of the second sealing air bag (52).