Miniaturized desktop advertisement projection screen air purifier

Abstract

The small desktop advertisement projection screen air purifier comprises a shell, a filter cavity, a first air inlet and a first air outlet are formed in the shell, the first air inlet and the first air outlet can communicate with the filter cavity, and a filter element and a fan are arranged in the filter cavity; the shell comprises a first connecting base, a second connecting base and a middle shaft connected between the first connecting base and the second connecting base, the filtering cavity is formed between the first connecting base and the middle shaft, the first air inlet is located in the peripheral side of the middle shaft, and the first air outlet is formed in the first connecting base and located in the end, away from the middle shaft, of the first connecting base; a mounting cavity is concavely formed in one end of the first connecting seat, and a display screen is arranged in the mounting cavity; wherein the peripheral side of the middle shaft is rotationally sleeved with a first annular shell, a first air inlet cavity capable of being communicated with the first air inlet is formed between the inner side of the first annular shell and the outer side wall of the middle shaft, and a second air inlet capable of being communicated with the first air inlet cavity is formed in one side of the first annular shell.

Description

Technical Field

[0001] This invention specifically relates to a miniaturized desktop advertising projection air purifier. Background Technology

[0002] With increasing attention to indoor air quality, desktop air purifiers have become a mainstream product in the market due to their compact size and suitability for small spaces such as office desks and coffee tables. To enhance product value, some desktop air purifiers have begun integrating advertising projection functions to meet the information dissemination needs of offices, restaurants, and other similar settings. However, existing desktop air purifiers with integrated advertising projection still suffer from the following technical challenges: The air inlets of existing products are mostly fixed structures, such as fixed vents on the side walls of the casing, allowing air to enter from only one direction or a localized area. This results in uneven air circulation around the desktop, easily creating "localized purification blind spots," especially in high-traffic desktop scenarios where the purification coverage is insufficient to meet actual needs. Furthermore, the desktop environment contains fine debris such as paper fibers, dust, and hair, which quickly adhere to the surface of the air inlet filter, causing blockage. Existing products either require frequent disassembly and cleaning, which is cumbersome, or the cleaning intervals are too long, affecting purification efficiency. It is difficult to achieve "high-frequency, low-operation-cost" filter maintenance, especially in high-frequency usage scenarios such as offices, where filter clogging is even more pronounced. Summary of the Invention

[0003] The present invention aims to at least partially solve one of the problems existing in the existing related technologies. To this end, the present invention proposes a miniaturized desktop advertising projection air purifier.

[0004] To achieve the above objectives, the present invention provides the following technical solution: A miniaturized desktop advertising projection air purifier includes a housing, a filter chamber inside the housing, and a first air inlet and a first air outlet that are respectively connected to the filter chamber. A filter element and a fan are respectively disposed in the filter chamber. The housing includes a first connecting seat, a second connecting seat, and a central shaft connecting the first connecting seat and the second connecting seat. The filter chamber is formed between the first connecting seat and the central shaft, and the first air inlet is located on the periphery of the central shaft. The first air outlet is disposed on the first connecting seat and located at one end opposite to the central shaft. One end of the first connecting seat has a recessed mounting cavity, and a display screen is disposed in the mounting cavity. The central shaft is rotatably fitted with a first annular shell. A first air inlet cavity, communicating with a first air inlet, is formed between the inner side of the first annular shell and the outer wall of the central shaft. A second air inlet, communicating with the first air inlet cavity, is provided on one side of the first annular shell. A filter screen is provided at the second air inlet. A second annular shell is rotatably fitted with a second annular shell. A second air inlet cavity is formed between the inner side of the second annular shell and the outer wall of the first annular shell. A brush, abutting against the side wall of the filter screen, is provided on the inner side of the second annular shell within the second air inlet cavity. A third air inlet, communicating with the second air inlet cavity, is provided on one side of the second annular shell. The third air inlet and the second air inlet... The orientations are opposite. The second connecting seat is provided with a driving member that can drive the first annular shell to rotate around the central axis. An elastic abutment member is provided between the first annular shell and the second annular shell. The elastic abutment member enables the second annular shell to rotate synchronously and in the same direction as the first annular shell. The elastic abutment member leaves room for the second annular shell to rotate in the opposite direction to the rotation of the first annular shell. A friction member that can rub against the outer surface of the second annular shell is movably provided on the second connecting seat. A transmission member is provided between the friction member and the first annular shell. The transmission member enables the friction member to rub against or move away from the second annular shell as the first annular shell rotates.

[0005] In one embodiment, the elastic abutment member includes a first spring and a protrusion, the inner side of the second annular housing has a recess, the protrusion is fixedly connected to the outer periphery of the first annular housing and extends into the recess, the movable space is formed between the sidewall of the recess and the sidewall of the protrusion, and the first spring is located in the movable space and abuts between the recess and the protrusion.

[0006] In one embodiment, the friction member includes a first movable member, a second movable member, and a connecting rod. The first movable member is movably disposed on a second connecting seat and can be radially displaced along the first annular shell. The second movable member is movably disposed vertically on the second connecting seat. The connecting rod is hinged between the first movable member and the second movable member. The upper side of the second movable member is provided with a friction head that can rub against the outer side of the second annular shell.

[0007] In one embodiment, a guide rail is provided on one side of the second connecting seat along the radial direction of the first annular housing, and the first movable member is movably mounted on the guide rail by a slider.

[0008] In one embodiment, a vertical guide shaft is provided on one side of the second connecting seat, and the second movable member is movably sleeved on the vertical guide shaft via a linear bearing.

[0009] In one embodiment, the transmission component includes a flange provided at one end opening of the first annular housing along the circumference. The flange is provided with a convex ring arranged on the same central axis as the central shaft. A second spring abuts against the side wall of the first movable member and the second connecting seat. The second spring keeps the first movable member in a connection state that tends to abut against the circumferential edge of the convex ring. At this time, the second movable member is kept in a connection state that moves downward away from the second annular housing. An arc-shaped protrusion is provided on the circumferential side of the convex ring. When the arc-shaped protrusion rotates with the first annular housing and presses against the first movable member, it can cause the first movable member to displace.

[0010] In one embodiment, the driving component includes a motor disposed on a second connecting seat, a driving gear disposed on the driving shaft of the motor, and a transmission gear disposed on the flange with the central axis coaxial with the central shaft, the transmission gear meshing with the driving gear.

[0011] In one embodiment, a through opening is provided on one side of the second annular housing that can communicate with the second air inlet cavity, and a cover plate is detachably provided at the opening.

[0012] In one embodiment, the second connecting seat has a recessed hanging groove on the side opposite to the central axis.

[0013] Compared with the prior art, the beneficial effects of the present invention are: The housing of this invention adopts a segmented design of "first connecting seat + second connecting seat + central axis". The filter chamber is integrated between the first connecting seat and the central axis, and the display screen is embedded in the mounting cavity of the first connecting seat, without occupying extra redundant space. The central axis serves as the core support component and simultaneously realizes the function of connecting the air intake channel and the structure, greatly simplifying the overall structure, ensuring that the product size is suitable for desktop scenarios, and resolving the contradiction between "functional integration and miniaturization". Furthermore, the first annular shell can rotate around the central axis, driving the second annular shell to move synchronously circumferentially, causing the main air intake end of the third air inlet to circulate along the central axis, breaking the limitation of the traditional fixed air inlet's "one-way air intake". This design allows the air intake range to cover a 360° area of ​​the desktop, avoiding local air stagnation and improving the uniformity of air circulation. It is especially suitable for shared office desks or restaurant bar counters, and its purification efficiency is more than 30% higher than that of products with fixed air inlets. Furthermore, through the structural design of the convex ring and arc-shaped protrusion in the transmission component, a complete filter cleaning action can be triggered every time the first annular housing rotates around the central axis. This eliminates the need for manual start-up and timed programs, and the cleaning frequency is synchronized with the air intake rotation, ensuring that the filter surface always maintains a low adhesion state, thus completely solving the problem of "fast filter clogging and untimely cleaning". Attached Figure Description

[0014] Figure 1 This is one of the cross-sectional views of a miniaturized desktop advertising projection air purifier according to the present invention; Figure 2 This is a second cross-sectional view of a miniaturized desktop advertising projection air purifier according to the present invention; Figure 3 This is the third cross-sectional view of a miniaturized desktop advertising projection air purifier according to the present invention; Figure 4 This is one of the exploded views of a miniaturized desktop advertising projection air purifier according to the present invention; Figure 5 This is the second exploded view of a miniaturized desktop advertising projection air purifier according to the present invention; Figure 6 This is the third exploded view of a miniaturized desktop advertising projection air purifier according to the present invention; Figure 7 This is a perspective view of a miniaturized desktop advertising projection air purifier according to the present invention. Detailed Implementation

[0015] The following detailed description provides various embodiments or examples for carrying out the present invention. Of course, these are merely embodiments or examples and are not intended to be limiting. Additionally, repeated reference numerals, such as repeated numbers and / or letters, may be used in different embodiments. These repetitions are for the purpose of simple and clear description of the invention and do not represent a specific relationship between the different embodiments and / or structures discussed.

[0016] like Figures 1 to 7The illustrated miniaturized desktop advertising projection air purifier includes a housing, a filter chamber 3 inside the housing, and a first air inlet 1 and a first air outlet 2 that are respectively connected to the filter chamber 3. A filter element 4 and a fan 5 are respectively provided in the filter chamber 3. The housing includes a first connecting seat 6, a second connecting seat 7, and a central shaft 8 connecting the first connecting seat 6 and the second connecting seat 7. The filter chamber 3 is formed between the first connecting seat 6 and the central shaft 8, and the first air inlet 1 is located on the periphery of the central shaft 8. The first air outlet 2 is provided on the first connecting seat 6 and located at the end opposite to the central shaft 8. One end of the first connecting seat 6 has a recessed mounting cavity, and a display screen 9 is provided in the mounting cavity. The central shaft 8 is rotatably fitted with a first annular shell 10. A first air inlet cavity 11, communicating with a first air inlet 1, is formed between the inner side of the first annular shell 10 and the outer wall of the central shaft 8. A second air inlet, communicating with the first air inlet cavity 11, is provided on one side of the first annular shell 10. A filter screen 12 is provided at the second air inlet. A second annular shell 13 is rotatably fitted with the outer side of the first annular shell 10. A second air inlet cavity 14, formed between the inner side of the second annular shell 13 and the outer wall of the first annular shell 10, is provided on the inner side of the second annular shell 13 within the second air inlet cavity 14. A brush 15, capable of abutting against the side wall of the filter screen 12, is provided on one side of the second annular shell 13. A third air inlet 16, communicating with the second air inlet 14, is provided on one side of the second annular shell 13. The third air inlet 16 and the second air inlet face each other... The two ring housings are arranged in opposite directions. The second connecting seat 7 is provided with a driving member 17 that can drive the first annular housing 10 to rotate around the central axis 8. An elastic abutment member 18 is provided between the first annular housing 10 and the second annular housing 13. The elastic abutment member 18 enables the second annular housing 13 to rotate synchronously and in the same direction as the first annular housing 10. The elastic abutment member 18 provides a space 19 for the second annular housing 13 to rotate in the opposite direction to the rotation of the first annular housing 10. A friction member 20 that can rub against the outer surface of the second annular housing 13 is movably arranged on the second connecting seat 7. A transmission member 21 is provided between the friction member 20 and the first annular housing 10. The transmission member 21 enables the friction member 20 to rub against or move away from the second annular housing 13 as the first annular housing 10 rotates.

[0017] Specifically, after the power is turned on, the fan 5 starts, creating negative pressure in the filter chamber 3 to provide power for airflow; at the same time, the driving component 17 on the second connecting seat 7 actuates, driving the first annular shell 10 to rotate uniformly around the central axis 8, such as clockwise. Since there is an elastic abutment component 18 between the first and second annular shells, this component drives the second annular shell 13 to rotate synchronously and in the same direction as the first annular shell 10 through elastic force. At this time, the elastic abutment component is not compressed, and the activity space 19 is not utilized.

[0018] Under the negative pressure of the fan 5, outside air first enters through the third air inlet 16 of the second annular housing 13. Because the second annular housing rotates with the first annular housing, the third air inlet moves 360° around the central axis, achieving full-range air intake and avoiding the local purification blind spots of traditional fixed air inlets. After the air enters the second air inlet chamber 14, the airflow is buffered here because the second and third air inlets face opposite directions, preventing the airflow from directly impacting the filter screen and causing impurities to embed deep in the filter material. Then, it passes through the second air inlet of the first annular housing 10 and is pre-filtered by the filter screen 12, intercepting hair, fibers, large dust particles and other debris. The pre-filtered air enters the first air inlet chamber 11, and then enters the filter chamber 3 through the first air inlet 1 on the side of the central axis 8. In the filter chamber 3, the air passes through the filter element 4 to achieve efficient filtration of PM2.5, odors and other harmful substances, and the fan 5, and finally exits from the first air outlet 2 on the first connecting seat 6 at the end opposite to the central axis 8. The process involves discharge, completing purification; during this process, the display screen 9 inside the first connecting seat 6 works synchronously to play advertisements, notifications, and other content, achieving a dual-function synergy of "purification + screen projection"; Through the cooperation of the transmission component 21 and the friction component 20, the second annular shell is triggered to rotate in opposite directions, and the filter screen is cleaned by a brush. The specific steps are as follows: During the continuous rotation of the first annular shell 10, the transmission component 21 between it and the friction component 20 moves as the transmission component rotates with the first annular shell, pushing the friction component to move, so that the friction component 20, which was originally far away from the second annular shell 13, moves closer to the outer surface of the second annular shell and rubs against it, providing reverse resistance to the second annular shell. Due to the frictional resistance of the friction component 20, the second annular shell 13 can no longer continue to rotate synchronously with the first annular shell 10; at this time, the first annular shell 10 continues to rotate, compressing the elastic abutment component 18, while the reserved movable space 19 of the elastic abutment component allows the second annular shell 13 to rotate in the opposite direction relative to the first annular shell 10, such as the first annular shell rotating clockwise and the second annular shell rotating counterclockwise.

[0019] The brush 15 inside the second annular housing 13 rotates in the opposite direction, and the brush tip rubs tightly against the side wall of the filter screen 12, scraping off the debris attached to the filter screen surface. At the same time, because the second air inlet and the third air inlet face opposite directions, when the second annular housing rotates in the opposite direction, some airflow forms a reverse flow between the first air inlet cavity 11 and the second air inlet cavity 14 and is discharged from the first air inlet cavity → second air inlet → second air inlet cavity → third air inlet. This reverse airflow can blow the debris scraped off by the brush away from the filter screen surface, preventing the debris from re-attaching and improving the cleaning effect. After the filter screen is cleaned, the first annular housing 10 continues to rotate, and the transmission component 21 drives the friction component 20 away from the second annular housing 13, and the friction resistance disappears. The elastic abutment component 18 restores its elastic deformation and drives the second annular housing 13 to rotate synchronously and in the same direction as the first annular housing 10 again. The equipment returns to the "normal air purification mode" and forms a cycle of "purification-cleaning-reset-repurification" to ensure that the filter screen remains unobstructed for a long time and maintains a stable purification efficiency.

[0020] Furthermore, the elastic abutment member 18 includes a first spring 22 and a protrusion 23. The inner side of the second annular housing 13 has a recess 24. The protrusion 23 is fixedly connected to the outer periphery of the first annular housing 10 and extends into the recess 24. The movable space 19 is formed between the sidewall of the recess 24 and the sidewall of the protrusion 23. The first spring 22 is located in the movable space 19 and abuts against the recess 24 and the protrusion 23.

[0021] Specifically, when the first annular housing 10 rotates, the protrusion 23 fixed to its outer periphery rotates together with it in the same direction and at the same speed. Since the spring 22 initially abuts against the sidewalls of the protrusion 23 and the concave portion 24, when the protrusion 23 rotates, it will exert a pushing force on the sidewalls of the concave portion 24 through the spring 22. This pushing force is transmitted to the second annular housing 13 through the concave portion 24, causing the second annular housing 13 to rotate synchronously and in the same direction as the first annular housing 10. At this time, the active space 19 is not fully utilized, the relative positions of the protrusion and the concave portion remain stable, and the spring only plays the role of "power transmission medium". When the two annular housings rotate synchronously, the third air inlet 16 on the second annular housing 13 moves 360° around the central axis 8 to achieve full-range air intake. It works with the filter screen 12 and the filter element 4 to complete air purification. During this stage, the elastic abutment component ensures the stable expansion of the air intake range and avoids the second annular housing from "idling" or "relagging in rotation".

[0022] When the friction member 20 comes into contact with the outer surface of the second annular housing 13, a reverse resistance is applied to the second annular housing, such as when the first annular housing rotates clockwise. This resistance keeps the second annular housing stationary, preventing the second annular housing 13 from continuing to rotate synchronously with the first annular housing 10. At this time, the driving member 17 still drives the first annular housing 10 to continue rotating, and the protrusion 23 fixed to the first annular housing also continues to rotate. However, the second annular housing 13 and the inner recess 24 are "resisted" due to the resistance. When the protrusion 23 continues to rotate, it will compress the spring 22 in the movable space 19. One end of the spring abuts against the fixed sidewall of the recess 24, and the other end is pushed to the other side of the movable space by the protrusion 23. The spring is gradually compressed, and at the same time, the protrusion 23 moves relative to the first annular shell in the movable space 19 of the recess 24 along the rotation direction of the first annular shell. If the protrusion moves clockwise, the recess remains stationary, and the two generate a circumferential relative displacement. This relative displacement causes the second annular shell 13 to rotate in the opposite direction relative to the first annular shell 10. The first annular shell rotates clockwise, and the second annular shell rotates counterclockwise due to resistance and spring compression. This drives the brush 15 inside the second annular shell 13 to rotate synchronously in the opposite direction. The brush tip rubs against the sidewall of the filter screen 12 to scrape away the debris on the surface of the filter screen. Furthermore, the friction component 20 includes a first movable member 25, a second movable member 26, and a connecting rod 27. The first movable member 25 is movably disposed on the second connecting seat 7 and can be radially displaced along the first annular housing 10. The second movable member 26 is movably disposed on the second connecting seat 7. The connecting rod 27 is hinged between the first movable member 25 and the second movable member 26. The upper side of the second movable member 26 is provided with a friction head 28 that can rub against the outer side of the second annular housing 13.

[0023] Specifically, during the normal purification phase, the transmission component 21 does not trigger the first movable component 25, and the first movable component 25 is in its initial radially inner position near the central axis 8. Due to the hinge relationship of the connecting rod 27, the inner position of the first movable component 25 drives the second movable component 26 to a low vertical position via the connecting rod. The friction head 28 on the second movable component 26 moves down accordingly, maintaining a gap with the outer wall of the second annular shell 13 without contact, and no frictional resistance is generated. In this state, the second annular shell 13 can rotate freely and synchronously with the first annular shell 10 under the drive of the elastic abutment component 18, ensuring that the third air inlet 16 rotates 360° to intake air without being disturbed by the friction component.

[0024] When the transmission component 21 triggers the cleaning action, the transmission component 21 rotates with the first annular housing 10, causing the first movable component 25 to move radially outward away from the central axis 8. When the first movable component 25 moves outward, it pulls the connecting rod to rotate through the hinge point of the connecting rod 27. One end of the connecting rod moves outward with the first movable component, while the other end pushes the second movable component 26 upward. Under the thrust of the connecting rod, the second movable component 26 moves vertically upward from a low position to a high position, and the friction head 28 at its top moves upward accordingly, eventually coming into close contact with the outer wall of the second annular housing 13. The friction head 28 is made of rubber, which can provide sufficient friction while avoiding damage to the outer surface of the second annular housing 13.

[0025] Furthermore, a guide rail is provided on one side of the second connecting seat 7 along the radial direction of the first annular housing 10, and the first movable member 25 is movably mounted on the guide rail by a slider. This ensures that the first movable member can stably move radially along the first annular housing.

[0026] Furthermore, a vertical guide shaft 29 is provided on one side of the second connecting seat 7, and the second movable member 26 is movably sleeved on the vertical guide shaft 29 via a linear bearing. This ensures that the second movable member can stably move up and down relative to the second connecting seat.

[0027] Furthermore, the transmission component 21 includes a flange 30 provided circumferentially at one end opening of the first annular housing 10. The flange 30 is provided with a convex ring 31 arranged coaxially with the central shaft 8. A second spring 99 abuts against the side wall of the first movable member 25 and the second connecting seat 7. The second spring 99 keeps the first movable member 25 in a connection state that tends to abut against the peripheral edge of the convex ring 31. At this time, the second movable member 26 is kept in a connection state that moves downward away from the second annular housing 13. An arc-shaped protrusion 32 is provided on the periphery of the convex ring 31. When the arc-shaped protrusion 32 rotates with the first annular housing 10 and presses against the first movable member 25, it can cause the first movable member 25 to be displaced.

[0028] Specifically, a flange 30 extends circumferentially from one end of the opening of the first annular housing 10, which is equivalent to an "extension flange" of the first annular housing. A convex ring 31 is fixed on the flange 30, and the convex ring 31 is coaxial with the central shaft 8 to ensure that the convex ring rotates synchronously and coaxially when the first annular housing rotates. An arc-shaped protrusion 32 is provided on the peripheral edge of the convex ring 31, which usually extends 30°-45° along the circumference of the convex ring, ensuring that the arc-shaped protrusion contacts the first movable part only once per revolution of the first annular housing, which meets the requirement of "cleaning once per revolution". The first movable part 25 is movably mounted on the second connecting seat 7, and a spring 99 abuts between the first movable part 25 and the side wall of the second connecting seat 7. In its initial state, the elastic force of the spring 99 always pushes the first movable part 25 to move towards the convex ring 31, so that the end of the first movable part is kept in contact with the peripheral edge of the convex ring 31. The first movable member 25 is hinged to the second movable member 26 via the connecting rod 27. The displacement of the first movable member is converted into the up-and-down movement of the second movable member through the connecting rod, ultimately controlling the contact state between the friction head 28 and the second annular housing 13.

[0029] Furthermore, the driving component 17 includes a motor 33 mounted on the second connecting seat 7. A driving gear 34 is mounted on the driving shaft of the motor 33, and a transmission gear 35 is mounted on the flange 30, which is coaxial with the central shaft 8. The transmission gear 35 meshes with the driving gear 34. Specifically, the motor drives the driving gear to rotate, thereby driving the first annular housing to rotate relative to the central shaft via the transmission gear.

[0030] Furthermore, an opening is provided through one side of the second annular housing 13, which communicates with the second air inlet chamber 14. A cover plate 36 is detachably installed at the opening. The user can then periodically remove the cover plate 36 to clean and discharge the debris collected in the second air inlet chamber 14, thus completing the filter maintenance.

[0031] Furthermore, the second connecting seat 7 has a recessed hanging groove 37 on the side opposite to the central axis 8. The hanging groove 37 at the bottom of the second connecting seat 7 can be hung on the edge of the desktop by means of an external hook, so that part of the product can be suspended outside the desktop, further saving desktop space and making it suitable for scenarios with limited desktop space, such as office workstations and coffee shop counters.

[0032] Based on the accompanying drawings and the foregoing illustrations and descriptions, the basic principles and main features of the present invention, as well as its advantages, those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the present invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A miniaturized desktop advertising projection air purifier, comprising a housing, wherein a filter chamber (3) is provided inside the housing, and a first air inlet (1) and a first air outlet (2) respectively connected to the filter chamber (3), and a filter element (4) and a fan (5) are respectively provided inside the filter chamber (3), characterized in that: The housing includes a first connecting seat (6), a second connecting seat (7), and a central shaft (8) connecting the first connecting seat (6) and the second connecting seat (7). The filter chamber (3) is formed between the first connecting seat (6) and the central shaft (8). The first air inlet (1) is located on the periphery of the central shaft (8). The first air outlet (2) is provided on the first connecting seat (6) and located at the end opposite to the central shaft (8). One end of the first connecting seat (6) has a recessed mounting cavity, and a display screen (9) is provided in the mounting cavity. Among them, a first annular shell (10) is rotatably sleeved on the outer periphery of the central shaft (8). A first air inlet cavity (11) is formed between the inner side of the first annular shell (10) and the outer wall of the central shaft (8) and can communicate with the first air inlet (1). A second air inlet is provided on one side of the first annular shell (10) and can communicate with the first air inlet cavity (11). A filter screen (12) is provided at the second air inlet. A second annular shell (13) is rotatably sleeved on the outer periphery of the first annular shell (10). A second air inlet cavity (14) is formed between the inner side of the second annular shell (13) and the outer wall of the first annular shell (10). A brush (15) that can abut against the side wall of the filter screen (12) is provided on the inner side of the second annular shell (13) in the second air inlet cavity (14). A third air inlet (16) that can communicate with the second air inlet cavity (14) is provided on one side of the second annular shell (13). The third air inlet (16) and the second air inlet are oriented at an angle. Conversely, the second connecting seat (7) is provided with a driving member (17) that can drive the first annular shell (10) to rotate around the central axis (8). An elastic abutment member (18) is provided between the first annular shell (10) and the second annular shell (13). The elastic abutment member (18) enables the second annular shell (13) to rotate synchronously and in the same direction with the first annular shell (10). The elastic abutment member (18) leaves a space (19) for the second annular shell (13) to rotate in the opposite direction to the rotation of the first annular shell (10). A friction member (20) that can rub against the outer surface of the second annular shell (13) is movably provided on the second connecting seat (7). A transmission member (21) is provided between the friction member (20) and the first annular shell (10). The transmission member (21) enables the friction member (20) to rub against or move away from the second annular shell (13) with the rotation of the first annular shell (10).

2. The miniaturized desktop advertising projection air purifier according to claim 1, characterized in that: The elastic abutment member (18) includes a first spring (22) and a protrusion (23). The inner side of the second annular shell (13) has a recess (24). The protrusion (23) is fixedly connected to the outer periphery of the first annular shell (10) and extends into the recess (24). The movable space (19) is formed between the side wall of the recess (24) and the side wall of the protrusion (23). The first spring (22) is located in the movable space (19) and abuts between the recess (24) and the protrusion (23).

3. The miniaturized desktop advertising projection air purifier according to claim 1, characterized in that: The friction component (20) includes a first movable component (25), a second movable component (26), and a connecting rod (27). The first movable component (25) is movably disposed on the second connecting seat (7) and can be radially displaced along the first annular shell (10). The second movable component (26) is movably disposed on the second connecting seat (7). The connecting rod (27) is hinged between the first movable component (25) and the second movable component (26). The upper side of the second movable component (26) is provided with a friction head (28) that can rub against the outer side of the second annular shell (13).

4. A miniaturized desktop advertising projection air purifier according to claim 3, characterized in that: The second connecting seat (7) has a guide rail arranged radially along the first annular housing (10) on one side, and the first movable part (25) is movably mounted on the guide rail by a slider.

5. A miniaturized desktop advertising projection air purifier according to claim 3, characterized in that: The second connecting seat (7) has a vertical guide shaft (29) on one side, and the second movable part (26) is movably sleeved on the vertical guide shaft (29) through a linear bearing.

6. A miniaturized desktop advertising projection air purifier according to claim 3, characterized in that: The transmission component (21) includes a flange (30) provided at one end of the opening of the first annular housing (10) along the circumference. The flange (30) is provided with a convex ring (31) arranged with the central axis (8) in the same direction. A second spring (99) abuts between the first movable member (25) and the side wall of the second connecting seat (7). The second spring (99) keeps the first movable member (25) in a connection state that tends to abut against the circumferential edge of the convex ring (31). At this time, the second movable member (26) is kept in a connection state that moves downward away from the second annular housing (13). An arc-shaped protrusion (32) is provided on the circumference of the convex ring (31). When the arc-shaped protrusion (32) rotates with the first annular housing (10) and presses against the first movable member (25), it can cause the first movable member (25) to move.

7. A miniaturized desktop advertising projection air purifier according to claim 6, characterized in that: The driving component (17) includes a motor (33) mounted on the second connecting seat (7). A driving gear (34) is mounted on the driving shaft of the motor (33). A transmission gear (35) is mounted on the flange (30) and is arranged on the same central axis as the central shaft (8). The transmission gear (35) meshes with the driving gear (34).

8. A miniaturized desktop advertising projection air purifier according to claim 1, characterized in that: The second annular shell (13) has a through opening on one side that can communicate with the second air inlet cavity (14), and a cover plate (36) is detachably provided at the opening.

9. A miniaturized desktop advertising projection air purifier according to claim 1, characterized in that: The second connecting seat (7) has a recessed hanging groove (37) on the side opposite to the central axis (8).

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