Purification circulating fan capable of adjusting air inlet area

Abstract

The invention discloses a purification circulating fan capable of adjusting the air inlet area, which comprises a fan body, a fan body air inlet, a fan body air inlet and a fan body air outlet, 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 invention 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 the functions of both fans and air purifiers and are increasingly favored by consumers.

[0003] The purification circulation fans currently available on the market are those that add a purification device to the traditional circulation fan, thereby achieving the two functions of blowing air to dissipate heat and purify the air. However, there are problems with the existing purification circulation fans. While the added purification device is purifying the air, it also blocks the air inlet, resulting in a small air inlet area and a small air inlet volume, which in turn results in insufficient wind. There are disadvantages such as low wind force, low air volume, and short blowing distance. When users need strong wind force, there is no good heat dissipation effect, the noise is also high, and the user experience is not good. The above-mentioned problems have seriously restricted the further promotion and application of this product.

[0004] In view of this, the purpose of the present invention is to provide a new technical solution to solve the existing technical problems. Summary of the invention

[0005] In order to overcome the shortcomings of the prior art, the present invention provides a purification circulation fan with adjustable air inlet area, which solves the technical defects of the 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.

[0006] The technical solution adopted by the present invention to solve its technical problem 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 a fuselage air inlet hole communicating with the hollow inner cavity of the fuselage,

[0009] A motor bracket, the motor bracket being installed in the hollow inner cavity of the fuselage;

[0010] A fan, wherein the fan is arranged at the central position 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 a 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, the air duct is arranged in the hollow inner cavity of the fuselage, the air duct is located between the air outlet grille and the motor bracket, and the air duct is provided with air inlet holes evenly distributed in the circumferential direction;

[0014] A controllable air duct ring, the controllable air duct ring is arranged in the hollow inner cavity of the fuselage, the controllable air duct ring is rotatably sleeved on the outer periphery of the air duct, the controllable air duct ring is provided with an air duct ring air inlet hole adapted to the air duct air inlet hole, 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 connected to each other 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 arranged on the air duct, a rotary drive gear is arranged on the output shaft of the rotary drive motor, and a rotary drive tooth matching the rotary drive gear is arranged on the controllable air duct ring, and the rotary drive tooth and the rotary drive gear are meshed with each other. 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 tooth is arranged on the inner wall of the controllable air duct ring, and the air duct is provided with an escape groove for passing the rotary drive gear so that the rotary drive gear and the rotary drive tooth are meshed with each other.

[0018] As another implementation improvement of the above technical solution, the controllable air duct ring extends outwardly 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, and 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, and 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, the filter assembly is sleeved 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 portion of the hollow inner cavity of the fuselage, the inner wall of the rear cover has a pressure ring plate, the pressure ring plate presses against the rear end of the filter assembly, and a rear cover handle is arranged 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, the front end of the air duct has a front duct ring plate, the rear end of the air duct has a rear duct ring plate, a duct positioning ring is arranged inside the fuselage, the rear side wall of the duct front ring plate abuts against the front side wall of the duct positioning ring, and the rear duct ring plate abuts against 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 has a mounting buckle extending backward, a positioning step and a buckle groove matching the mounting buckle are provided on the inner side of the fuselage, the rear end of the outer ring plate is mounted on the positioning step, the mounting buckle is buckled in the buckle 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 hole of the fuselage is connected to the air space.

[0025] As a further improvement of the above technical solution, the fuselage air inlet holes include rear air inlet holes located at the rear of the fuselage and front air inlet holes located at the front of the fuselage, the rear air inlet holes are elliptical holes evenly distributed radially along the rear of the fuselage, and the front air inlet holes are long strip holes evenly distributed radially along the front of the fuselage, the position of the rear air inlet holes roughly corresponds to the position of the filter assembly, and the position of the front air holes roughly corresponds to the position of the controllable air duct ring.

[0026] As a further improvement of the above technical solution, the air duct air inlet hole and the air duct ring air 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 effect of the present invention is that the present invention provides a purification circulation fan with adjustable air inlet area. The purification circulation fan with 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 hole and the air duct air inlet hole, thereby controlling the air volume entering the air duct, which is the advantage of flexibility of use. When the air needs to be purified, the controllable air duct ring is rotated to close the air duct ring air inlet hole and the air duct air inlet hole. At this time, all the air volume needs to be filtered by the filter component, 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 hole and the air duct air inlet hole. At this time, most of the air flowing in from the air inlet hole of the fuselage will be directly sent out by the fan, and a small part of the air flowing in from the air inlet hole of the fuselage will be filtered by the filter component. Under this use condition, it has the advantages of large 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 purification, large air volume, strong wind force, long air supply distance and low noise. It has high flexibility when consumers use it, better user experience, better market competitiveness, and facilitates 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 is further described below in conjunction with the accompanying drawings and embodiments.

[0031] Figure 1 It is a schematic diagram of the assembly of a purification circulation fan with adjustable air inlet area in Embodiment 1 of the present invention;

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

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

[0034] Figure 4 It is a schematic diagram of the cross section and wind flow 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 It is a schematic diagram of the cross section and wind flow 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 6 This is a schematic diagram of the internal assembly of a purification circulation fan with adjustable air inlet area in Embodiment 1 of the present invention;

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

[0038] Figure 8 This is a structural breakdown diagram of the fuselage, controllable air duct ring and air duct in Example 2 of the present invention. 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 technicians in this field without creative work are all within the scope of protection of the present invention. In addition, all the connection / connection relationships involved in the patent do not simply 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 invention can be combined interchangeably without conflicting with each other, refer to Figure 1-Figure 8 .

[0040] Embodiment 1:

[0041] Reference Figure 1-6 , the present invention 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 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 fan blade 31 is arranged on the output shaft of the fan 3; 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 Between the air outlet grille 4 and the motor bracket 2, the air duct 6 is provided with air duct inlet holes 61 which 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 which are adapted to the air duct inlet holes 61, and 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 interconnected 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 wind 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 filtering 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 assembly 6 and then enters the interior, and 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 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, refer 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 matches the rotary drive gear 91. The rotary drive tooth 72 is meshed with the rotary drive gear 91. 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 gear 72. In application, when the air volume needs to be adjusted, the control device of the purification circulation fan controls the rotary drive motor 9 to operate, 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 gear 72, and then the rotating controllable air duct ring 7 is used to control the air intake volume to achieve automatic control.

[0047] In terms of specific structure, the rotary drive teeth 72 are arranged on the inner 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. In this embodiment, the rotary drive motor 9 is a stepping motor.

[0048] In some other embodiments, the rotary drive motor 9 may be disposed on the controllable air duct ring 7, and the rotary drive teeth 72 may be disposed on the air duct 6, which may be disposed as required during specific implementation.

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

[0050] In some embodiments, the filter assembly 8 is a cylindrical filter device, and the filter assembly 8 is sleeved outside the connection grille 23. The bracket mounting ring plate 21 and the connection grille 23 form a step outside the motor bracket 2. The front end of the filter assembly 8 is installed at the step, and the rear end of the filter assembly 8 abuts against the rear cover 5. The filter assembly 8 can adopt an existing known filter device, and the implementer can select a suitable type according to specific needs.

[0051] In some embodiments, the rear cover 5 is detachably arranged at the rear end of the hollow inner cavity 10 of the fuselage 1. The inner wall of the rear cover 5 has a pressing ring plate 51, and the pressing ring plate 51 presses against the rear end of the filter assembly 8. The pressing ring plate 51 can provide a stabilizing function for the filter assembly 8 to prevent the filter assembly 6 from becoming loose and affecting the performance. A rear cover handle is provided at the rear end of the rear cover 5 to facilitate the installation and removal of the rear cover 5. The rear cover can be detachably installed at the rear end of the fuselage 1 through existing known connection forms such as a snap-fit ​​device, a plug-in device, and screws.

[0052] In some embodiments, the air duct 6 is an annular cylinder structure that passes through from front to back, and 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. The fuselage 1 is provided with an air duct positioning ring 13, and 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. The air outlet grille 4 includes an external ring plate 41 and grille bars 42 connected to the external ring plate 41, and the external ring plate 41 extends backward with a mounting buckle 43. The inner side of the fuselage 1 is provided with a positioning step 14 and a buckle groove 15 that matches the mounting buckle 43. The rear end of the external ring plate 41 is mounted on the positioning step 14, and the mounting buckle 43 is buckled in the buckle groove 15 to fix the air outlet grille 4 and the fuselage 1 to each other.

[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 through a rotating shaft. The base body can be a support with an electric rotation function or a hand rotation function, and can specifically adopt an existing known support setting form. The implementer can select a suitable support type according to the needs. A rotation limit device and an angle fixing device can be set at the rotating shaft. The fuselage 1 can be limited to rotate within a certain angle range through an active limit device, and 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 consistent devices, which will not be repeated here.

[0057] Embodiment 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 extends outwardly with a rotating paddle 73 for driving the controllable air duct ring 7 to rotate 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. The fuselage 1 is provided with a paddle passing slot 12 adapted to the rotating paddle 73. The paddle passing slot 12 is a long strip slot. In this embodiment, the rotating paddle 73 is provided to replace the components such as the rotating drive motor 9, the rotating drive gear 91 and the rotating drive gear 72 in the embodiment 1, so as to simplify the structure and reduce the cost.

[0060] The above is a specific description of the preferred implementation of the present invention, but the 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), the fuselage (1) having a hollow inner cavity (10) extending from front to back, the fuselage (1) being 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 installed in the hollow inner cavity (10) of the fuselage (1); A fan (3), wherein the fan (3) is arranged at a central position of the motor bracket (2), and a fan blade (31) is arranged on an output shaft of the fan (3); An air outlet grille (4), the air outlet grille (4) being arranged at a front end outlet of the hollow inner cavity (10) of the fuselage (1); A rear cover (5), the rear cover (5) being arranged at a 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) evenly 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) rotate relative to each other, the air duct air inlet hole (61) and the air duct ring air inlet hole (71) are interconnected or isolated from each other; A filter assembly (8), wherein the filter assembly (8) is arranged between the motor bracket (2) and the inner wall of the body (1).

2. A 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), the output shaft of the rotary drive motor (9) is provided with a rotary drive gear (91), the controllable air duct ring (7) is provided with a rotary drive tooth (72) matching the rotary drive gear (91), the rotary drive tooth (72) and the rotary drive gear (91) are meshed with each other, and 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. A 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); and a paddle passing slot (12) adapted to fit the rotating paddle (73) is opened 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 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 for being directly or indirectly fixedly connected to the fuselage (1); the fan (3) is fixedly mounted on the fan mounting grille plate (22); and the motor bracket (2) is a grille-type barrel-shaped structure having an opening, and the opening faces the front end of the fuselage (1).

6. A 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 outside 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 at the step, 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 port 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) is pressed against the rear end of the filter assembly (8); and a rear cover handle is provided at the rear end 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 connected from front to back. The front end of the air duct (6) has a front air duct ring plate (63), and the rear end of the air duct (6) has a rear air duct ring plate (64). An air duct positioning ring (13) is arranged 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 backward; 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 empty 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 empty 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 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: It also 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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