A filter screen detachable portable air purifier

Abstract

The application discloses a portable air purifier with detachable filter screen, which comprises a shell assembly, a purification air duct formed in the shell assembly, and an air inlet arranged on the shell assembly; a filter screen body arranged in the shell assembly and intercepting the purification air duct; a fan transmission mechanism comprising a main shaft, a first fan blade arranged on the main shaft, and a secondary shaft selectively linked with the main shaft, the secondary shaft being provided with an expandable or contractible second fan blade; a centrifugal response mechanism arranged between the main shaft and the secondary shaft, used for driving the secondary shaft to lock rotation with the main shaft when the rotation speed of the main shaft reaches a set threshold; and a driving connection mechanism arranged between the secondary shaft and the filter screen body, used for driving the filter screen body to rotate synchronously when the secondary shaft rotates. The application solves the problems of the prior art, such as the filter screen body being easily blocked to cause wind pressure attenuation, the self-cleaning mechanism being complex, and flocculent substances being easily secondarily adsorbed.

Description

Technical Field

[0001] This invention relates to the field of air purification equipment technology, and in particular to a portable air purifier with a detachable filter. Background Technology

[0002] With increasing public awareness of air quality, portable air purifiers have gained widespread use due to their compact size, portability, and versatility.

[0003] During long-term use, existing portable air purifiers tend to accumulate a large amount of hair, dust, and lint on the windward side of the filter. As the amount of lint increases, airflow resistance increases, leading to a significant decrease in the purifier's airflow and air pressure, thus reducing purification efficiency. To solve the filter clogging problem, existing self-cleaning purifiers typically require an additional motor-driven scraper or brush for cleaning. This not only increases the size, weight, and cost of the device but also makes it easy for lint to be re-adsorbed onto the filter under strong winds.

[0004] Therefore, a portable air purifier with a detachable filter is needed to solve the above problems. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings of existing technologies by proposing a portable air purifier with a detachable filter. This invention solves the problems of easy clogging of the filter body leading to reduced air pressure, complex self-cleaning mechanisms, and easy secondary adsorption of fibrous materials in existing technologies.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: A portable air purifier with a detachable filter includes a housing assembly, wherein a purification air duct is formed inside the housing assembly, and the housing assembly is provided with an air inlet and an air hole. The filter body is located inside the outer casing assembly and is intercepted in the purification air duct; A fan transmission mechanism includes a main shaft, a first fan blade mounted on the main shaft, and a secondary shaft that can selectively drive the main shaft in conjunction with it. The secondary shaft is provided with a second fan blade that can be deployed or retracted. A centrifugal response mechanism is provided between the main shaft and the auxiliary shaft, and is used to drive the auxiliary shaft to lock the main shaft to rotate when the main shaft speed reaches a set threshold. A drive connection mechanism is provided between the secondary shaft and the filter screen body, and is used to drive the filter screen body to rotate synchronously when the secondary shaft rotates; A cleaning mechanism, located inside the housing assembly and adjacent to the surface of the filter body, is used to peel off fibrous material adhering to the surface of the filter body when it rotates.

[0007] In some possible implementations, the housing assembly includes: The lower shell has multiple air inlets located on its outer wall. The upper cover is located at the upper end of the lower shell, and the upper cover has a round opening; The lower shell and the upper cover are fastened together to form an installation cavity, and the filter screen body is vertically installed inside the lower shell.

[0008] In some possible implementations, the fan drive mechanism includes: The upper cylinder is fixedly connected to the inner wall of the circular opening of the upper cover; The lower cylinder is rotatably connected to the lower end of the upper cylinder; The motor mounting box is fixedly installed inside the upper end of the upper cylinder; A servo motor is installed inside the motor mounting box, and the spindle is fixedly connected to the end of the output shaft of the servo motor. The secondary shaft is fixedly connected to the inner bottom of the lower cylinder. A cylindrical groove is provided at the upper end of the secondary shaft, and the lower end of the main shaft extends into the cylindrical groove.

[0009] In some possible implementations, the centrifugal response mechanism includes: A groove is formed on the outer wall of the main shaft; An embedded block, which is slidably connected within the groove; A spring, which is elastically connected between the embedded block and the bottom wall of the groove; An embedded hole is formed in the inner wall of the cylindrical groove of the secondary shaft; The centrifugal response mechanism consists of three sets. When the spindle speed reaches a set threshold, the embedded block overcomes the spring tension under the action of centrifugal force, slides outward, and is embedded into the embedded hole, thereby locking the spindle and the auxiliary spindle together.

[0010] In some possible implementations, the outer wall of the secondary shaft is provided with a variable span structure, the variable span structure comprising: Multiple fixing blocks are fixedly connected in pairs to the outer wall of the sub-shaft; A rotating shaft, which is rotatably connected between each pair of the fixed blocks; A torsion spring is sleeved on a rotating shaft, and the two ends of the torsion spring are respectively connected to a fixed block and the rotating shaft; The second fan blade is fixedly connected to the corresponding rotating shaft, and the second fan blade and the first fan blade are arranged circumferentially in an alternating manner; when the secondary shaft drives the second fan blade to rotate and unfolds against the torsion spring force, the second fan blade is projected axially into the gap between two adjacent first fan blades.

[0011] In some possible implementations, the drive connection mechanism includes: Multiple insertion blocks are fixedly connected to the lower end of the lower cylinder; Multiple insertion slots are provided on the upper end face of the filter body; The lower cylinder is inserted into the insertion slot via an insertion block and connected to the filter screen body.

[0012] In some possible implementations, a rotary guide mechanism is also included, the rotary guide mechanism comprising: A fixing ring is fixedly connected to the inner bottom of the lower shell, and the upper end of the fixing ring is provided with an annular groove for accommodating the lower end of the filter screen body. Vertical grooves are formed on the sidewalls of the annular groove; An arc-shaped groove is formed on the side wall of the annular groove and one end is connected to the vertical groove. The extension direction of the arc-shaped groove is consistent with the rotation direction of the servo motor. A protrusion is fixedly connected to the lower end of the outer wall of the filter body; the protrusion is guided along the vertical groove and slidably inserted into the arc-shaped groove, so that the filter body rotates unidirectionally in the annular groove.

[0013] In some possible implementations, the cleaning mechanism includes: Multiple sleeve posts are fixedly installed at the inner bottom of the lower shell; A retaining ring, which is fixedly sleeved on the sleeve post; Multiple positioning posts are fixedly connected to the outer wall of the upper cylinder; The cleaning roller has round holes at both its upper and lower ends, and the outer wall of the cleaning roller is covered with barbs that are inclined in the opposite direction to the rotation direction of the servo motor. The positioning pin is inserted into the upper circular hole from top to bottom, and the sleeve pin is inserted into the lower circular hole from bottom to top. The lower end face of the cleaning roller is supported on the retaining ring, so that the cleaning roller can be rotated and stand upright in the lower shell and rub against the outer wall of the filter screen body.

[0014] In some possible implementations, a gas flow rate sensor is installed on the inner wall of the upper cylinder to detect the gas flow rate in the air duct in real time in order to control the speed adjustment of the servo motor.

[0015] The present invention has the following beneficial effects: Compared with the existing technology, the present invention can realize multiple functions such as "air volume suction", "secondary shaft clutch", "air pressure compensation" and "filter body self-cleaning" with only one servo motor, without the need for an additional cleaning motor, which simplifies the mechanical structure and control logic and reduces the size and failure rate of the equipment. Compared with existing technologies, when the filter body is blocked by fibrous material, causing the gas flow rate to decrease, the servo motor speeds up and triggers the centrifugal response mechanism, which connects the secondary shaft and drives the second fan blade to open up, forming a compound impeller with the first fan blade to supplement the wind pressure and air volume. Compared with existing technologies, the filter body is rotated by the secondary shaft and rubs against the barbed cleaning roller. The friction drives the cleaning roller to rotate slowly. The barbs in the opposite direction roll up and peel off the lint on the filter body in one direction, avoiding the problem of dust and lint being re-adsorbed on the filter body under high wind speed and strong suction. Compared with existing technologies, the combination of vertical grooves and arc-shaped grooves with protrusions at the bottom of the lower shell not only ensures convenient and quick installation of the filter body, but also achieves stable unidirectional circumferential rotation and prevents the filter body from falling off during operation.

[0016] Other features and advantages disclosed in this invention will be described in detail in the following detailed description section. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the external structure of a portable air purifier with a detachable filter proposed in this invention. Figure 2 This is a schematic diagram of the internal structure of the lower shell; Figure 3 This is a schematic diagram of the upper cover structure; Figure 4 for Figure 3 A sectional view; Figure 5 This is a schematic diagram of the filter screen body. Figure 6 A structural diagram of the main shaft and the secondary shaft; Figure 7 for Figure 6 A sectional view; Figure 8 This is a schematic diagram of the cleaning roller.

[0018] In the diagram: 101 Lower shell, 102 Upper cover, 103 Filter screen body, 201 Upper cylinder, 202 Lower cylinder, 203 Air hole, 204 Motor mounting box, 205 Main shaft, 206 First fan blade, 207 Sub-shaft, 208 Second fan blade, 209 Cylindrical groove, 301 Fixing ring, 302 Vertical groove, 303 Arc groove, 304 Insertion block, 305 Insertion slot, 306 Protrusion, 401 Sleeve post, 402 Retaining ring, 403 Positioning post, 404 Cleaning roller, 405 Round hole, 501 Embedding hole, 502 Embedding block, 503 Spring, 504 Slide groove, 601 Fixing block, 602 Rotating shaft, 603 Torsion spring. Detailed Implementation

[0019] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

[0020] Reference Figures 1-2 A portable air purifier with a detachable filter includes a housing assembly comprising a lower housing 101 and an upper cover 102 covering the upper part of the lower housing 101. The outer wall of the lower housing 101 has multiple air inlets for the air to be purified to enter. The upper cover 102 has a circular opening and is fastened to the lower housing 101 to form an installation cavity. The filter body 103 is vertically disposed inside the lower housing 101.

[0021] During long-term operation, air purifier filters can become clogged, causing an exponential increase in resistance within the air duct. If the fan maintains a constant power output, the airflow and air pressure will decrease dramatically, resulting in a severe drop in purification efficiency.

[0022] To address the aforementioned problems, in some embodiments of this disclosure, reference is made to... Figures 3-4 By integrating a gas flow rate sensor into the inner wall of the upper cylinder 201, the actual gas flow rate changes in the duct can be monitored in real time, providing accurate data feedback for the adaptive speed adjustment of the servo motor. The rotational cooperation between the split upper cylinder 201 and the lower cylinder 202 not only ensures the stable installation of the motor in the upper section of the duct, but also provides axial support and freedom of movement for the lower section sub-shaft 207 to transmit torque to drive the rotation of the filter body 103.

[0023] Specifically, an upper cylinder 201 is fixedly connected to the inner wall of the circular opening of the upper cover 102, and a lower cylinder 202 is rotatably connected to the lower end of the upper cylinder 201. Air holes 203 are provided on the opposite sides of the upper cylinder 201 and the lower cylinder 202. A motor mounting box 204 is fixedly installed inside the upper end of the upper cylinder 201. A servo motor is installed inside the motor mounting box 204. A main shaft 205 is fixedly connected to the end of the output shaft of the servo motor. Multiple first fan blades 206 are fixedly installed on the outer wall of the main shaft 205. A secondary shaft 207 is fixedly connected to the upper end of the lower cylinder 202. A cylindrical groove 209 is opened at the upper end of the secondary shaft 207. The lower end of the main shaft 205 extends into the cylindrical groove 209. A gas flow rate sensor is also installed on the inner wall of the upper cylinder 201 to detect the gas flow rate in the air duct in real time.

[0024] In the normal purification mode, having the secondary shaft 207, the second fan blade 208, and the filter body 103 rotate at high speed along with the main shaft 205 will not only consume a lot of useless work and greatly increase the energy consumption and operating noise of the equipment, but also accelerate the mechanical wear of the transmission components and the filter body seals.

[0025] To address the aforementioned problems, in some embodiments of this disclosure, reference is made to... Figures 6-7The centrifugal response mechanism utilizes physical centrifugal force and the deformation of spring 503 to achieve adaptive clutch engagement. At normal low speed, the clutch is completely disengaged, and the secondary shaft 207 and the mechanism below remain stationary, ensuring that the equipment operates with extremely quiet operation and low energy consumption. When the wind resistance increases, causing the servo motor to actively accelerate and reach the set speed threshold, the embedded block 502 is instantly thrown out by the centrifugal force and locked into the embedded hole 501. The overall structure is extremely compact.

[0026] Specifically, the centrifugal response mechanism is located between the main shaft 205 and the secondary shaft 207. The outer wall of the main shaft 205 has multiple grooves 504, and each groove 504 has an insert block 502 slidably connected in it. A spring 503 is elastically connected between the insert block 502 and the bottom wall of the groove 504. The inner wall of the cylindrical groove 209 of the secondary shaft 207 has multiple insertion holes 501 corresponding to the insert blocks 502.

[0027] Fans with fixed aerodynamic blades have inherent performance bottlenecks when dealing with high wind resistance environments: fewer blades result in quiet operation at low wind resistance but insufficient pressure head at high wind resistance; more blades result in high intake wind resistance and high noise during normal operation.

[0028] To address the aforementioned problems, in some embodiments of this disclosure, reference is made to... Figure 6 The second blade 208 and the torsion spring 603 form an adaptive variable blade deployment mechanism. When the secondary shaft is not engaged, the second blade 208 is in a suspended and close-fitting posture, which does not block the main airflow of the duct at all, ensuring the smooth and quiet operation of conventional purification. When the centrifugal response mechanism is engaged and the secondary shaft 207 rotates, the second blade 208 is instantly thrown open by centrifugal force, which cleverly fills the circumferential gap between the first blades 206, instantly reconstructing the impeller into a high-blade-density composite impeller, providing a strong static pressure compensation capability to overcome high wind resistance.

[0029] Specifically, the outer wall of the secondary shaft 207 is provided with a variable airfoil structure. Multiple pairs of fixed blocks 601 are fixed to the outer wall of the secondary shaft 207. A rotating shaft 602 is rotatably connected between each pair of fixed blocks 601. A torsion spring 603 is sleeved on the rotating shaft 602, with its two ends connected to the fixed block 601 and the rotating shaft 602, respectively. The second fan blade 208 is fixedly connected to the corresponding rotating shaft 602. The second fan blade 208 and the first fan blade 206 are arranged circumferentially in a staggered manner. When the second fan blade 208 is flung open by centrifugal force, its axial projection falls precisely into the gap between two adjacent first fan blades 206.

[0030] When the cylindrical filter body is self-cleaning at high speed, if there is no reliable axial constraint and radial positioning at the top and bottom ends, it is very easy to experience axial jumping, eccentric shaking, or even being thrown off under high-speed eccentric force or airflow disturbance; at the same time, it is also necessary to take into account the smoothness of manual installation of the filter body and the blind insertion positioning requirements of the user.

[0031] To address the aforementioned problems, in some embodiments of this disclosure, reference is made to... Figure 2 and Figure 3 The filter body is equipped with a drive and rotation guide mechanism. The plug-in type of the top insertion block 304 and the insertion slot 305 not only facilitates the user's direct insertion and removal of the filter body, but also efficiently transmits torque during rotation. The bottom vertical slot 302 and arc slot 303 form a snap-fit ​​one-way anti-detachment track. After the protrusion 306 is inserted vertically along the vertical slot 302, it will automatically slide into and lock in the arc slot 303 under the inertial torque of the clockwise rotation of the motor, which completely eliminates axial movement during high-speed rotation and ensures the stability of the filter body 103 during rotation.

[0032] Specifically, a plurality of insertion blocks 304 are fixedly connected to the lower end of the lower cylinder 202, and a plurality of insertion slots 305 that cooperate with the insertion blocks 304 are opened on the upper end surface of the filter screen body 103. The lower cylinder 202 is connected to the filter screen body 103 by inserting the insertion blocks 304 into the insertion slots 305. A fixing ring 301 is fixedly connected to the inner bottom of the lower shell 101. An annular groove is opened at the upper end of the fixing ring 301. The lower end of the filter screen body 103 is accommodated in the annular groove. A vertical groove 302 and an arc groove 303 communicating with the vertical groove 302 are opened on the side wall of the annular groove. The extension direction of the arc groove 303 is consistent with the rotation direction of the servo motor. A protrusion 306 is fixedly connected to the lower end of the outer wall of the filter screen body 103. The protrusion 306 is guided along the vertical groove 302 and inserted into the arc groove 303.

[0033] Inside air purifiers operating in strong airflow conditions, traditional hard scrapers or brushes can easily damage the filter fibers. Furthermore, the hair and lint scraped off can be easily "re-adsorbed" back onto the filter under strong suction, causing the self-cleaning function to fail completely. In addition, stationary scrapers can easily cause tangled material to accumulate and become stuck.

[0034] To address the aforementioned problems, in some embodiments of this disclosure, reference is made to... Figure 2 and Figure 8 The system is equipped with a cleaning mechanism. The cleaning roller 404 is supported in a "non-powered self-rotation state" by the positioning column 403 and the sleeve column 401. When the filter body 103 rotates and rubs against the cleaning roller 404, the friction drives the cleaning roller 404 to rotate slowly, avoiding local wear. The barb structure on the outer wall of the cleaning roller is inclined in opposite directions. It uses the unidirectional hooking characteristic to roll up the hair and lint on the windward side of the filter body 103 onto the cleaning roller 404. The barb setting avoids the technical problem of lint being adsorbed back onto the filter body in strong wind environment.

[0035] Specifically, the cleaning mechanism includes four sleeves 401 fixed to the bottom of the lower shell 101. A retaining ring 402 is fixedly fitted on the sleeves 401. A plurality of downwardly extending positioning posts 403 are fixedly connected to the outer wall of the upper cylinder 201. Four cleaning rollers 404 are vertically arranged inside the purifier. The outer wall of the cleaning rollers 404 is distributed with barbs, and the inclination of the barbs is opposite to the rotation direction of the servo motor. The upper and lower ends of the cleaning rollers 404 are provided with round holes 405. The positioning posts 403 are inserted into the upper round hole 405 from top to bottom, and the sleeves 401 are inserted into the lower round hole 405 from bottom to top. The lower end face of the cleaning rollers 404 is supported on the retaining ring 402, so that the four cleaning rollers 404 can be rotated and stand upright in the lower shell 101 and rub against the outer wall of the filter screen body 103.

[0036] The functional principle of this invention can be explained through the following operational methods: Normal purification mode: The servo motor drives the main shaft 205 to rotate, which in turn drives the first fan blade 206 to rotate at high speed and generate negative pressure. Air enters through the air inlet on the lower shell 101, is filtered by the filter screen body 103, and is discharged upward. At this time, the speed of the main shaft 205 has not reached the threshold. The embedded block 502 is stored in the slide groove 504 under the tension of the spring 503. The secondary shaft 207 does not rotate. The second fan blade 208 is in a suspended and retracted posture under the action of the torsion spring 603. The filter screen body 103 remains stationary.

[0037] Self-cleaning and wind pressure compensation modes: When the surface of the filter body 103 accumulates flocculent material, causing increased wind resistance and reduced gas flow rate, the gas flow rate sensor detects the decrease in wind speed and feeds it back to the controller, which controls the servo motor to increase its speed within a preset time. When the speed of the main shaft 205 reaches the preset threshold, the embedded block 502 is pushed outward by centrifugal force, overcoming the tension of the spring 503, and is thrown into the embedded hole 501 of the secondary shaft 207, thus realizing the locking transmission between the main shaft 205 and the secondary shaft 207.

[0038] When the secondary shaft 207 rotates, the second fan blade 208, under the action of centrifugal force, overcomes the elastic force of the torsion spring 603 and unfolds outward, filling the gap between the adjacent first fan blade 206 and increasing the static pressure and exhaust volume of the impeller; at the same time, the secondary shaft 207 drives the lower cylinder 202 to rotate, and the lower cylinder 202 drives the filter screen body 103 to rotate in the annular groove through the cooperation of the insertion block 304 and the insertion groove 305 (the protrusion 306 slides in the arc groove 303 to restrict axial movement).

[0039] The rotating filter body 103 brushes against the four cleaning rollers 404. The friction drives the cleaning rollers 404 to rotate slowly. Since the barbs on the outer wall of the cleaning rollers 404 face opposite to the direction of rotation, the barbs hook and peel off the hair and lint from the windward side of the filter body 103 and roll them evenly onto the roller of the cleaning roller 404. This effectively prevents the lint from being adsorbed back onto the filter body 103 under strong wind conditions. After cleaning is completed, the servo motor slows down, the centrifugal response mechanism resets and disconnects, and the quiet and high-efficiency operation is restored.

[0040] The above are merely preferred embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A portable air purifier with a detachable filter, characterized in that, include: The housing assembly has a purification air duct formed inside it and an air inlet on it. The filter body (103) is located inside the outer casing assembly and is intercepted in the purification air duct; A fan transmission mechanism includes a main shaft, a first fan blade mounted on the main shaft, and a secondary shaft that can selectively drive the main shaft in conjunction with it. The secondary shaft is provided with a second fan blade that can be deployed or retracted. A centrifugal response mechanism is provided between the main shaft and the auxiliary shaft, and is used to drive the auxiliary shaft to lock the main shaft to rotate when the main shaft speed reaches a set threshold. A drive connection mechanism is provided between the secondary shaft and the filter screen body (103) for driving the filter screen body (103) to rotate synchronously when the secondary shaft rotates; A cleaning mechanism, disposed inside the housing assembly and adjacent to the surface of the filter body (103), is used to peel off fibrous material adhering to its surface when the filter body (103) rotates.

2. A portable air purifier with a detachable filter according to claim 1, characterized in that: The housing assembly includes: The lower shell (101) has multiple air inlets on its outer wall; The upper cover (102) is located on the upper end of the lower shell (101), and the upper cover (102) has a round opening; The lower shell (101) and the upper cover (102) are fastened together to form an installation cavity, and the filter screen body (103) is vertically arranged inside the lower shell (101).

3. A portable air purifier with a detachable filter according to claim 2, characterized in that: The fan transmission mechanism includes: The upper cylinder (201) is fixedly connected to the inner wall of the round opening of the upper cover (102); The lower cylinder (202) is rotatably connected to the lower end of the upper cylinder (201); The motor mounting box (204) is fixedly installed inside the upper end of the upper cylinder (201); A servo motor is installed in the motor mounting box (204), and the spindle (205) is fixedly connected to the end of the output shaft of the servo motor; The secondary shaft (207) is fixedly connected to the inner bottom of the lower cylinder (202). A cylindrical groove (209) is provided at the upper end of the secondary shaft (207), and the lower end of the main shaft (205) extends into the cylindrical groove (209).

4. A portable air purifier with a detachable filter according to claim 3, characterized in that: The centrifugal response mechanism includes: A groove (504) is formed on the outer wall of the main shaft (205); An embedded block (502) is slidably connected within the groove (504); A spring (503) is elastically connected between the embedded block (502) and the bottom wall of the groove (504); An embedded hole (501) is formed in the inner wall of the cylindrical groove (209) of the secondary shaft (207); The centrifugal response mechanism is provided in three sets. When the rotational speed of the main shaft (205) reaches the set threshold, the embedded block (502) overcomes the tension of the spring (503) under the action of centrifugal force, slides out and is embedded in the embedded hole (501), so that the main shaft (205) and the secondary shaft (207) are locked together.

5. A portable air purifier with a detachable filter according to claim 3, characterized in that: The outer wall of the secondary shaft (207) is provided with a variable span structure, the variable span structure comprising: Multiple fixing blocks (601) are fixedly connected in pairs to the outer wall of the secondary shaft (207); A rotating shaft (602) is rotatably connected between each pair of the fixed blocks (601); A torsion spring (603) is sleeved on a rotating shaft (602), and the two ends of the torsion spring (603) are respectively connected to a fixing block (601) and a rotating shaft (602). The second fan blade (208) is fixedly connected to the corresponding rotating shaft (602), and the second fan blade (208) and the first fan blade (206) are arranged in a circumferentially staggered manner; when the secondary shaft (207) drives the second fan blade (208) to rotate and unfolds against the elastic force of the torsion spring (603), the second fan blade (208) is projected into the gap between two adjacent first fan blades (206) in the axial direction.

6. A portable air purifier with a detachable filter according to claim 3, characterized in that: The drive connection mechanism includes: Multiple insertion blocks (304) are fixedly connected to the lower end of the lower cylinder (202); Multiple insertion slots (305) are provided on the upper end face of the filter body (103); The lower cylinder (202) is inserted into the insertion slot (305) via the insertion block (304) and connected to the filter body (103).

7. A portable air purifier with a detachable filter according to claim 2, characterized in that: It also includes a rotary guide mechanism, which comprises: A fixing ring (301) is fixedly connected to the inner bottom of the lower shell (101), and the upper end of the fixing ring (301) is provided with an annular groove for accommodating the lower end of the filter screen body (103). A vertical groove (302) is formed on the side wall of the annular groove; An arc-shaped groove (303) is formed on the side wall of the annular groove and one end is connected to the vertical groove (302). The extension direction of the arc-shaped groove (303) is consistent with the rotation direction of the servo motor. A protrusion (306) is fixedly connected to the lower end of the outer wall of the filter body (103); the protrusion (306) is guided along the vertical groove (302) and slidably inserted into the arc groove (303), so that the filter body (103) rotates unidirectionally in the annular groove.

8. A portable air purifier with a detachable filter according to claim 3, characterized in that: The cleaning mechanism includes: Multiple sleeve posts (401) are fixedly disposed at the inner bottom of the lower shell (101); A retaining ring (402) is fixedly sleeved on the sleeve post (401); Multiple positioning posts (403) are fixedly connected to the outer wall of the upper cylinder (201); The cleaning roller (404) has round holes (405) at both its upper and lower ends, and the outer wall of the cleaning roller (404) is provided with barbs that are inclined in the opposite direction to the rotation direction of the servo motor. The positioning post (403) is inserted into the upper circular hole (405) from top to bottom, and the sleeve post (401) is inserted into the lower circular hole (405) from bottom to top. The lower end face of the cleaning roller (404) is supported on the retaining ring (402), so that the cleaning roller (404) can be rotated and stand upright in the lower shell (101) and rub against the outer wall of the filter screen body (103).

9. A portable air purifier with a detachable filter according to claim 3, characterized in that: A gas flow rate sensor is installed on the inner wall of the upper cylinder (201) to detect the gas flow rate in the air duct in real time in order to control the speed adjustment of the servo motor.

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