Purification circulating fan capable of adjusting air inlet area

Abstract

The utility model discloses a purification circulating fan capable of adjusting air inlet area, which comprises a fan body provided with a fan body air inlet hole; the motor bracket is mounted in the hollow inner cavity; the fan is arranged on the motor support, and fan blades are arranged on an output shaft of the fan; an air outlet grid; a rear cover; air duct air inlet holes which are uniformly distributed in the circumferential direction are formed in the air duct; the controllable air duct ring is rotatably arranged on the periphery of the air duct in a sleeving mode, air duct ring air inlet holes are formed in the controllable air duct ring, and when the controllable air duct ring and the air duct rotate relative to each other, the air duct air inlet holes and the air duct ring air inlet holes communicate with each other or are isolated from each other; and the filtering assembly is arranged between the motor bracket and the inner wall of the machine body. According to the purification circulating fan capable of adjusting the air inlet area, the air inlet amount of the circulating fan can be adjusted by controlling the controllable air duct ring, and the purification circulating fan has the beneficial effects of being high in use flexibility, capable of achieving the advantages of large wind power, large air volume, long air blowing distance and low noise and good in use experience.

Description

Technical Field

[0001] The utility model relates to a purification circulation fan, in particular to a purification circulation fan with adjustable air inlet area. Background Art

[0002] Circulation fans with purification functions are widely used household appliances. They have both fan and air purification functions and are increasingly favored by consumers.

[0003] The purification circulation fans currently available on the market add a purification device to the traditional circulation fan, thereby achieving the dual functions of blowing air for heat dissipation and air purification. However, there are problems with existing purification circulation fans. While the added purification device purifies the air, it also blocks the air inlet, resulting in a small air inlet area and a small air volume. This in turn results in insufficient wind force, small air volume, and a short blowing distance. When users need strong wind force, they do not have a good heat dissipation effect, the noise is also relatively high, and the user experience is poor. These various problems have seriously restricted the further promotion and application of this product.

[0004] In view of this, the purpose of this utility model is to provide a new technical solution to solve the existing technical problems. Utility Model Content

[0005] In order to overcome the shortcomings of the existing technology, the utility model provides a purification circulation fan with adjustable air inlet area, which solves the technical defects of the existing purification circulation fan such as low wind force, small air volume, short blowing distance, high noise, poor flexibility of use, and poor user experience.

[0006] The technical solution adopted by the utility model to solve its technical problems is:

[0007] A purification circulation fan with adjustable air inlet area, comprising:

[0008] The fuselage has a hollow inner cavity extending from front to back, and the fuselage is provided with an air inlet hole communicating with the hollow inner cavity of the fuselage.

[0009] a motor bracket, the motor bracket being mounted in the hollow inner cavity of the fuselage;

[0010] A fan is arranged at the center of the motor bracket, and a fan blade is arranged on the output shaft of the fan;

[0011] an air outlet grille, the air outlet grille being arranged at the front end outlet of the hollow inner cavity of the fuselage;

[0012] a rear cover, the rear cover being arranged at a rear end entrance of the hollow inner cavity of the fuselage;

[0013] An air duct is provided in the hollow inner cavity of the fuselage, the air duct is located between the air outlet grille and the motor bracket, and is provided with air inlet holes evenly distributed circumferentially;

[0014] A controllable air duct ring, the controllable air duct ring being disposed in the hollow inner cavity of the fuselage and rotatably sleeved on the outer periphery of the air duct, the controllable air duct ring being provided with an air duct ring air inlet hole adapted to the air duct air inlet hole, such that when the controllable air duct ring and the air duct rotate relative to each other, the air duct air inlet hole and the air duct ring air inlet hole are interconnected or isolated from each other;

[0015] A filter assembly is arranged between the motor bracket and the inner wall of the fuselage.

[0016] As one of the implementation improvements of the above technical solution, a rotary drive motor is provided on the air duct, a rotary drive gear is provided on the output shaft of the rotary drive motor, and a rotary drive tooth matching the rotary drive gear is provided on the controllable air duct ring. The rotary drive tooth and the rotary drive gear are engaged with each other, and the rotary drive motor can drive the controllable air duct ring to rotate relative to the air duct through the rotary drive gear and the rotary drive tooth.

[0017] As a further improvement of the above technical solution, the rotary drive gear is arranged on the inner wall of the controllable air duct ring, and the air duct is provided with an air avoidance groove for passing the rotary drive gear so that the rotary drive gear and the rotary drive gear engage with each other.

[0018] As another implementation improvement of the above technical solution, the controllable air duct ring extends outward with a rotating paddle for driving it to rotate relative to the controllable air duct ring. The rotating paddle passes through the fuselage and extends to the outside of the fuselage. A paddle passing slot is opened on the fuselage to adapt to the rotating paddle.

[0019] As a further improvement of the above technical solution, the motor bracket includes a bracket mounting ring plate, a fan mounting grille plate and a connecting grille connected between the bracket mounting ring plate and the fan mounting grille plate. The bracket mounting ring plate is used to be directly or indirectly fixedly connected to the fuselage. The fan is fixedly mounted on the fan mounting grille plate. The motor bracket is a grille-type barrel structure with an opening and the opening faces the front end of the fuselage.

[0020] As a further improvement of the above technical solution, the filter assembly is a cylindrical filter device, which is mounted on the outside of the connecting grille. The bracket mounting ring plate and the connecting grille form a step outside the motor bracket. The front end of the filter assembly is installed at the step, and the rear end of the filter assembly abuts against the rear cover.

[0021] As a further improvement of the above technical solution, the rear cover is detachably arranged at the rear port position of the hollow inner cavity of the fuselage, the inner wall of the rear cover has a top pressure ring plate, the top pressure ring plate presses to the rear end of the filter assembly, and a rear cover handle is provided at the rear end of the rear cover.

[0022] As a further improvement of the above technical solution, the air duct is an annular cylinder structure that passes through from front to back, with a front duct ring plate at the front end of the air duct and a rear duct ring plate at the rear end of the air duct. A duct positioning ring is provided inside the fuselage, and the rear side wall of the front duct ring plate rests on the front side wall of the duct positioning ring, and the rear duct ring plate rests on the front end of the motor bracket.

[0023] As a further improvement of the above technical solution, the air outlet grille includes an outer ring plate and grille bars connected to the outer ring plate, the outer ring plate extends rearward with a mounting clip, the inner side of the fuselage is provided with a positioning step and a clip groove matching the mounting clip, the rear end of the outer ring plate is fitted on the positioning step, the mounting clip is buckled into the clip groove and fixes the air outlet grille and the fuselage to each other.

[0024] As a further improvement of the above technical solution, there is an air space between the inner wall of the fuselage and the outer wall of the filter assembly and the outer wall of the controllable air duct ring, and the air inlet of the fuselage is connected to the air space.

[0025] As a further improvement of the above technical solution, the fuselage air inlet includes a rear air inlet located at the rear of the fuselage and a front air inlet located at the front of the fuselage. The rear air inlet is an elliptical hole evenly distributed radially along the rear of the fuselage, and the front air inlet is a long strip hole evenly distributed radially along the front of the fuselage. The position of the rear air inlet is roughly corresponding to the position of the filter assembly, and the position of the front air hole is roughly corresponding to the position of the controllable air duct ring.

[0026] As a further improvement of the above technical solution, the air duct inlet hole and the air duct ring inlet hole are both long strip-shaped through holes extending along the axial direction of the fuselage.

[0027] As a further improvement of the above technical solution, it also includes a base, the base includes a base body and a support arm, and the support arm is rotatably connected to the fuselage through a rotating shaft.

[0028] The beneficial effects of the present invention are as follows: the present invention provides a purification circulation fan with an adjustable air inlet area, and the purification circulation fan with an adjustable air inlet area can be driven to rotate by a controllable air duct ring, and the controllable air duct ring and the air duct are used to adjust the air volume passing through the air duct ring air inlet and the air duct air inlet, thereby controlling the air volume entering the air duct, which is the advantage of flexibility of use. When it is necessary to purify the air, the controllable air duct ring is rotated to close the air duct ring air inlet and the air duct air inlet. At this time, all the air volume needs to pass through the filtering effect of the filter assembly, which has the advantage of maximizing the purification effect. When a large air volume is required, the controllable air duct ring is rotated to open the air duct ring air inlet and the air duct air inlet. At this time, most of the air flowing in from the fuselage air inlet will be directly sent out by the fan, and a small part of the air flowing in from the fuselage air inlet is filtered by the filter assembly. Under this operating condition, it has the advantages of high wind force, large air volume, long air supply distance and low noise. Therefore, this type of purification circulation fan with adjustable air inlet area can flexibly combine the advantages of filtration and purification, large air volume, strong wind force, long air supply distance and low noise. Consumers have high flexibility when using it, better user experience, better market competitiveness, and facilitate the further promotion of this product.

[0029] In summary, this purification circulation fan with adjustable air inlet area solves the technical defects of existing purification circulation fans, such as low wind force, small air volume, short blowing distance, high noise, poor flexibility of use, and poor user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0031] Figure 1 This is a schematic diagram of the assembly of a purification circulation fan with adjustable air inlet area in Example 1 of the present utility model;

[0032] Figure 2 This is another assembly diagram of a purification circulation fan with adjustable air inlet area in Example 1 of the present utility model;

[0033] Figure 3 This is a structural disassembled diagram of a purification circulation fan with adjustable air inlet area in Example 1 of the present utility model;

[0034] Figure 4 This is a schematic diagram of the cross section and airflow direction of a purification circulation fan with adjustable air inlet area in Example 1 of the present invention when the controllable air duct ring is open;

[0035] Figure 5 This is a schematic diagram of the cross section and airflow direction of a purification circulation fan with adjustable air inlet area in Example 1 of the present invention when the controllable air duct ring is closed;

[0036] Figure 6This is a schematic diagram of the internal assembly of a purification circulation fan with adjustable air inlet area in Example 1 of the present utility model;

[0037] Figure 7 This is a schematic diagram of the internal assembly of a purification circulation fan with adjustable air inlet area in Example 2 of the present utility model;

[0038] Figure 8 This is a structural disassembly diagram of the fuselage, controllable air duct ring and air duct in Example 2 of the present utility model. DETAILED DESCRIPTION

[0039] The following will clearly and completely describe the concept, specific structure and technical effects of the present invention in combination with the embodiments and drawings, so as to fully understand the purpose, characteristics and effects of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, other embodiments obtained by technical personnel in this field without creative work are within the scope of protection of the present invention. In addition, all the connection / connection relationships involved in the patent do not refer to the direct connection of components, but refer to the formation of a better connection structure by adding or reducing connection accessories according to the specific implementation situation. The various technical features in the creation of the present utility model can be combined interactively without conflicting with each other, refer to Figures 1-8 .

[0040] Example 1:

[0041] Reference Figure 1-6 , the utility model provides:

[0042] A purification circulation fan with adjustable air inlet area comprises: a body 1, a motor bracket 2, a fan 3, an air outlet grille 4, a rear cover 5, an air duct 6, a controllable air duct ring 7, a filter assembly 6 and a base 100.

[0043] Specific reference Figure 2 、 Figure 3 、 Figure 4 and Figure 5In the present technical solution, the fuselage 1 has a hollow inner cavity 10 that passes through the front and back, the fuselage 1 is provided with a fuselage air inlet 11 that is connected to the hollow inner cavity 10 of the fuselage 1, and the motor bracket 2 is installed in the hollow inner cavity 10 of the fuselage 1; the fan 3 is arranged at the central position of the motor bracket 2, and the output shaft of the fan 3 is provided with a fan blade 31; the air outlet grille 4 is arranged at the front end outlet of the hollow inner cavity 10 of the fuselage 1; the rear cover 5 is arranged at the rear end entrance of the hollow inner cavity 10 of the fuselage 1; the air duct 6 is arranged in the hollow inner cavity 10 of the fuselage 1, and the air duct 6 is arranged at the rear end entrance of the hollow inner cavity 10 of the fuselage 1 Between the air outlet grille 4 and the motor bracket 2, the air duct 6 is provided with air duct inlet holes 61 that are evenly distributed in the circumference; the controllable air duct ring 7 is arranged in the hollow inner cavity 10 of the fuselage 1, and the controllable air duct ring 7 is rotatably mounted on the outer periphery of the air duct 6, and the controllable air duct ring 7 is provided with air duct ring inlet holes 71 that are adapted to the air duct inlet holes 61. When the controllable air duct ring 7 and the air duct 6 rotate relative to each other, the air duct inlet holes 61 and the air duct ring inlet holes 71 are connected to or isolated from each other; the filter assembly 8 is arranged between the motor bracket 2 and the inner wall of the fuselage 1.

[0044] In this technical solution, after the purification circulation fan starts working, the fan 3 drives the fan blades 31 to operate, driving the air to pass through the air outlet grille 4 and then blow toward the front end. When the user needs to achieve the maximum purification effect, the controllable air duct ring 7 is controlled to rotate relative to the air duct 6, so that the air duct ring air inlet 71 and the air duct air inlet 61 are isolated from each other. At this time, the air entering the hollow inner cavity 10 from the fuselage air inlet 11 cannot enter the air duct 6 through the air duct ring air inlet 71 and the air duct air inlet 61. All air entering the hollow inner cavity 10 needs to pass through the filtration process of the filter assembly 8 before entering the air duct. In this case, almost all air needs to be filtered to maximize the filtering function.

[0045] When the user needs the purification circulation fan to blow air with high wind force and air volume, the controllable air duct ring 7 is controlled to rotate relative to the air duct 6, so that the air duct ring air inlet 71 is connected to the air duct air inlet 61. At this time, a small part of the air entering the hollow inner cavity 10 from the fuselage air inlet 11 is filtered by the filter component 6 and then enters the interior. Most of the air entering the hollow inner cavity 10 from the fuselage air inlet 11 passes through the air duct ring air inlet 71 and the air duct air inlet 61 and then enters the interior of the air duct 6. At this time, the purification circulation fan has high wind force, large air volume, long air outlet distance, good cooling experience, low noise, and high flexibility in use.

[0046] In this embodiment, referring to Figure 3 、 Figure 4 、 Figure 6The air duct 6 is provided with a rotary drive motor 9, and a rotary drive gear 91 is provided on the output shaft of the rotary drive motor 9. The controllable air duct ring 7 is provided with a rotary drive tooth 72 that cooperates with the rotary drive gear 91. The rotary drive tooth 72 and the rotary drive gear 91 are meshed with each other. The rotary drive motor 9 can drive the controllable air duct ring 7 to rotate relative to the air duct 6 through the rotary drive gear 91 and the rotary drive tooth 72. During application, when it is necessary to adjust the air volume, the control device of the purification circulation fan controls the operation of the rotary drive motor 9, and the rotary drive motor 9 drives the rotary drive gear 91 to rotate. The rotary drive gear 91 drives the controllable air duct ring 7 to rotate through the rotary drive tooth 72. The rotating controllable air duct ring 7 is then used to control the air intake volume, thereby realizing automatic control.

[0047] In terms of specific structure, the rotary drive teeth 72 are arranged on the inner side wall of the controllable air duct ring 7, and the air duct 6 is provided with a clearance groove 62 for passing the rotary drive gear 91 so as to enable the rotary drive gear 91 to mesh with the rotary drive teeth 72. In this embodiment, the rotary drive motor 9 is a stepping motor.

[0048] In some other embodiments, the rotary drive motor 9 may be arranged on the controllable air duct ring 7, and the rotary drive teeth 72 may be arranged on the air duct 6. The arrangements may be made as needed during specific implementation.

[0049] In some embodiments, the motor bracket 2 includes a bracket mounting ring plate 21, a fan mounting grille plate 22, and a connecting grille 23 connected between the bracket mounting ring plate 21 and the fan mounting grille plate 22. The bracket mounting ring plate 21 is used to be directly or indirectly fixedly connected to the fuselage 1. The fan 3 is fixedly mounted on the fan mounting grille plate 22. The motor bracket 2 is a grille-like barrel structure with an opening, and the opening is facing the front end of the fuselage 1. The fan mounting grille plate 22 includes a grille and a fan mounting seat in the middle, and the fan 3 is mounted on the fan mounting seat. The fan grille plate 22 has grille holes for air to pass through. The connecting grilles 23 are evenly distributed circumferentially, and there are grille holes between adjacent connecting grilles 23.

[0050] In some embodiments, the filter assembly 8 is a cylindrical filter device that is sleeved onto the exterior of the connecting grille 23. The bracket mounting ring plate 21 and the connecting grille 23 form a step outside the motor bracket 2. The front end of the filter assembly 8 is mounted on the step, and the rear end of the filter assembly 8 abuts against the rear cover 5. The filter assembly 8 can be a conventionally known filter device, and the implementer can select an appropriate type based on specific needs.

[0051] In some embodiments, the rear cover 5 is removably mounted at the rear end of the hollow interior 10 of the housing 1. The inner wall of the rear cover 5 includes a pressure ring 51, which presses against the rear end of the filter assembly 8. This pressure ring 51 provides a secure fit for the filter assembly 8, preventing it from becoming loose and potentially affecting performance. A rear cover handle is provided at the rear end of the rear cover 5 to facilitate installation and removal. The rear cover can be removably mounted to the rear end of the housing 1 using known connection methods, such as snap-fit devices, plug-in devices, and screws.

[0052] In some embodiments, the air duct 6 is an annular cylindrical structure that passes through from front to back. The front end of the air duct 6 has a front duct ring plate 63, and the rear end of the air duct 6 has a rear duct ring plate 64. A duct positioning ring 13 is provided inside the fuselage 1. The rear side wall of the front duct ring plate 63 abuts against the front side wall of the duct positioning ring 13, and the rear duct ring plate 64 abuts against the front end of the motor bracket 2. The air outlet grille 4 includes an outer ring plate 41 and grille bars 42 connected to the inner portion of the outer ring plate 41. The outer ring plate 41 has a mounting clip 43 extending rearward. The inner side of the fuselage 1 is provided with a positioning step 14 and a clip groove 15 that cooperates with the mounting clip 43. The rear end of the outer ring plate 41 is mounted on the positioning step 14. The mounting clip 43 is engaged with the clip groove 15 to secure the air outlet grille 4 to the fuselage 1.

[0053] In some embodiments, there is an air space between the inner wall of the fuselage 1 and the outer wall of the filter assembly 8 and the outer wall of the controllable air duct ring 7, and the fuselage air inlet 11 is connected to the air space.

[0054] In some embodiments, the fuselage air inlet 11 includes a rear air inlet located at the rear of the fuselage 1 and a front air inlet located at the front of the fuselage 1. The rear air inlet is an elliptical hole evenly distributed radially along the rear of the fuselage 1, and the front air inlet is a long strip hole evenly distributed radially along the front of the fuselage 1. The position of the rear air inlet is roughly corresponding to the position of the filter assembly 8, and the position of the front air hole is roughly corresponding to the position of the controllable air duct ring 7.

[0055] In some embodiments, the air duct inlet hole 61 and the air duct ring inlet hole 71 are both long strip-shaped through holes extending along the axial direction of the fuselage.

[0056] The base 100 includes a base body and a support arm 101, and the support arm 101 is rotatably connected to the fuselage 1 via a rotating shaft. The base body can be a support with an electric rotation function or a manual rotation function. Specifically, it can adopt an existing known support setting form. The implementer can select a suitable support type according to specific needs. A rotation limit device and an angle fixing device can be set at the rotating shaft. The active limit device can limit the rotation of the fuselage 1 within a certain angle range. The angle fixing device is used to limit the fuselage to a suitable angle. The angle fixing device can adopt a damping type, an elastic buckle type, or other similar devices, which will not be described in detail here.

[0057] Example 2:

[0058] Reference Figure 7 、 Figure 8 This embodiment is basically the same as embodiment 1, except that:

[0059] In this embodiment, the controllable air duct ring 7 has a rotating paddle 73 extending outwardly for driving its rotation relative to the controllable air duct ring 7. The rotating paddle 73 passes through the body 1 and extends to the outside of the body 1. The body 1 is provided with a paddle slot 12 adapted to accommodate the rotating paddle 73. The paddle slot 12 is an elongated slot. In this embodiment, the rotating paddle 73 replaces the rotating drive motor 9, rotating drive gear 91, and rotating drive gear 72 of Example 1, thereby simplifying the structure and reducing costs.

[0060] The above is a specific description of the preferred implementation of the present invention, but the invention of the present invention is not limited to the embodiments. Those skilled in the art can make various equivalent modifications or substitutions without violating the spirit of the present invention. These equivalent modifications or substitutions are all included in the scope defined by the claims of this application.

Claims

1. A purification circulation fan with adjustable air inlet area, characterized in that: include: A fuselage (1), wherein the fuselage (1) has a hollow inner cavity (10) extending from front to back, and the fuselage (1) is provided with a fuselage air inlet hole (11) communicating with the hollow inner cavity (10) of the fuselage (1). a motor bracket (2), the motor bracket (2) being mounted in the hollow inner cavity (10) of the fuselage (1); A fan (3), the fan (3) being arranged at a central position of the motor bracket (2), and a fan blade (31) being arranged on an output shaft of the fan (3); an air outlet grille (4), the air outlet grille (4) being arranged at the front end outlet of the hollow inner cavity (10) of the fuselage (1); a rear cover (5), the rear cover (5) being arranged at the rear end entrance of the hollow inner cavity (10) of the fuselage (1); An air duct (6), the air duct (6) being arranged in the hollow inner cavity (10) of the fuselage (1), the air duct (6) being located between the air outlet grille (4) and the motor bracket (2), and the air duct (6) being provided with air inlet holes (61) uniformly distributed in the circumferential direction; A controllable air duct ring (7), the controllable air duct ring (7) being arranged in the hollow inner cavity (10) of the fuselage (1), the controllable air duct ring (7) being rotatably sleeved on the outer periphery of the air duct (6), the controllable air duct ring (7) being provided with an air duct ring air inlet hole (71) adapted to the air duct air inlet hole (61), and when the controllable air duct ring (7) and the air duct (6) are rotated relative to each other, the air duct air inlet hole (61) and the air duct ring air inlet hole (71) are connected to each other or isolated from each other; A filter assembly (8) is provided between the motor bracket (2) and the inner wall of the body (1).

2. The purification circulation fan with adjustable air inlet area according to claim 1, characterized in that: The air duct (6) is provided with a rotary drive motor (9), an output shaft of the rotary drive motor (9) is provided with a rotary drive gear (91), and the controllable air duct ring (7) is provided with a rotary drive tooth (72) that matches the rotary drive gear (91), and the rotary drive tooth (72) and the rotary drive gear (91) are meshed with each other. The rotary drive motor (9) can drive the controllable air duct ring (7) to rotate relative to the air duct (6) through the rotary drive gear (91) and the rotary drive tooth (72).

3. The purification circulation fan with adjustable air inlet area according to claim 2, characterized in that: The rotary drive teeth (72) are arranged on the inner side wall of the controllable air duct ring (7), and the air duct (6) is provided with an escape groove (62) for passing the rotary drive gear (91) so that the rotary drive gear (91) and the rotary drive teeth (72) are meshed with each other.

4. The purification circulation fan with adjustable air inlet area according to claim 1, characterized in that: The controllable air duct ring (7) has a rotating paddle (73) extending outwardly for driving the rotating paddle (7) relative to the controllable air duct ring (7). The rotating paddle (73) passes through the fuselage (1) and extends to the outside of the fuselage (1). A paddle passing slot (12) adapted to fit the rotating paddle (73) is provided on the fuselage (1).

5. The purification circulation fan with adjustable air inlet area according to claim 1, characterized in that: The motor bracket (2) comprises a bracket mounting ring plate (21), a fan mounting grid plate (22), and a connecting grid (23) connected between the bracket mounting ring plate (21) and the fan mounting grid plate (22); the bracket mounting ring plate (21) is used for being directly or indirectly fixedly connected to the fuselage (1); the fan (3) is fixedly mounted on the fan mounting grid plate (22); and the motor bracket (2) is a grid-type barrel-shaped structure having an opening, and the opening faces the front end of the fuselage (1).

6. The purification circulation fan with adjustable air inlet area according to claim 5, characterized in that: The filter assembly (8) is a cylindrical filter device. The filter assembly (8) is sleeved on the outside of the connecting grille (23). The bracket mounting ring plate (21) and the connecting grille (23) form a stepped position outside the motor bracket (2). The front end of the filter assembly (8) is mounted on the stepped position, and the rear end of the filter assembly (8) abuts against the rear cover (5).

7. The purification circulation fan with adjustable air inlet area according to claim 1, characterized in that: The rear cover (5) is detachably arranged at the rear end portion of the hollow inner cavity (10) of the body (1); the inner wall of the rear cover (5) is provided with a pressing ring plate (51); the pressing ring plate (51) presses against the rear end of the filter assembly (8); and a rear cover handle is provided at the rear end portion of the rear cover (5).

8. The purification circulation fan with adjustable air inlet area according to claim 1, characterized in that: The air duct (6) is an annular cylindrical structure that is continuous from front to back. The front end of the air duct (6) is provided with a front air duct ring plate (63), and the rear end of the air duct (6) is provided with a rear air duct ring plate (64). An air duct positioning ring (13) is provided inside the fuselage (1). The rear side wall of the air duct front ring plate (63) abuts against the front side wall of the air duct positioning ring (13), and the air duct rear ring plate (64) abuts against the front end of the motor bracket (2).

9. The purification circulation fan with adjustable air inlet area according to claim 1, characterized in that: The air outlet grille (4) comprises an outer ring plate (41) and grille bars (42) connected to the outer ring plate (41); the outer ring plate (41) is provided with a mounting buckle (43) extending rearward; a positioning step (14) and a buckle groove (15) matching the mounting buckle (43) are provided on the inner side of the fuselage (1); the rear end of the outer ring plate (41) is mounted on the positioning step (14); the mounting buckle (43) is buckled in the buckle groove (15) and fixes the air outlet grille (4) and the fuselage (1) to each other.

10. The purification circulation fan with adjustable air inlet area according to claim 1, characterized in that: There is an air space between the inner wall of the fuselage (1) and the outer wall of the filter assembly (8) and the outer wall of the controllable air duct ring (7), and the fuselage air inlet (11) is connected to the air space.

11. The purification circulation fan with adjustable air inlet area according to claim 1, characterized in that: The fuselage air inlet holes (11) include rear air inlet holes located at the rear of the fuselage (1) and front air inlet holes located at the front of the fuselage (1), the rear air inlet holes are elliptical holes evenly distributed along the radial direction of the rear of the fuselage (1), and the front air inlet holes are long strip holes evenly distributed along the radial direction of the front of the fuselage (1), the position of the rear air inlet holes roughly corresponds to the position of the filter assembly (8), and the position of the front air inlet holes roughly corresponds to the position of the controllable air duct ring (7).

12. The purification circulation fan with adjustable air inlet area according to claim 1, characterized in that: The air duct air inlet hole (61) and the air duct ring air inlet hole (71) are both long strip-shaped through holes extending along the axial direction of the fuselage.

13. The purification circulation fan with adjustable air inlet area according to claim 1, characterized in that: The device further comprises a base (100), wherein the base (100) comprises a base body and a support arm (101), and the support arm (101) is rotatably connected to the body (1) via a rotating shaft.

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