An air circulation fan

Abstract

The present invention discloses an air circulation fan, comprising: a base, a body, and a filtering device arranged in the body, a base is arranged on the top of the body, a spherical cavity is arranged in the base, a clean air outlet is opened on the spherical cavity, the body is swingably arranged on the base about a circumferential direction, and the body can be manually rotated on the base to adjust the air outlet area; a head is swingably placed on the spherical cavity along a pitch angle, and the spherical cavity has an open part for the head to swing thereon to discharge air, and a guide part extending and shielding the rear of the head, the guide part is arranged on the peripheral side of the clean air outlet and guides part of the purified air into the head, wherein the extension of the guide part to the rear of the head means that the guide part extends at the air suction area at the rear of the head to improve the air purification effect and the air outlet directionality.

Description

Technical Field

[0001] The invention relates to the technical field of air purification equipment, and in particular to an air circulation fan. Background Art

[0002] The purpose of an air circulation fan is to stir the air so that the indoor air forms a convection cycle, allowing the wind to blow out in a spiral shape along a certain direction. As the fan blades stir, a spiral column of wind can eventually be formed. The wind blown out by an air circulation fan has a longer distance and better directionality.

[0003] At present, an air circulation fan on the market has the function of circumferential rotation or swinging at a pitch angle, but it can only blow out air but cannot purify the air. An air purifier in the prior art has the function of purifying the air, but its air outlet cannot be adjusted and swung at a circumferential or pitch angle, and the air outlet area cannot be adjusted. In addition, the air outlet of this air purifier has a large air divergence. Although it can perform a large-scale purification in a large area, the working efficiency is not high, and the purified air is mixed with the unpurified air and discharged simultaneously, making it difficult to purify the air in a designated area. The air outlet has poor directionality and the purification effect is not good. Summary of the invention

[0004] In view of the deficiencies in the prior art, an object of the present invention is to provide an air circulation fan to improve the air purification effect and air outlet directionality.

[0005] The above technical purpose of the present invention is achieved through the following technical solutions: an air circulation fan, comprising: a base;

[0006] A machine body, wherein a machine base is provided on the top of the machine body, a spherical cavity is provided in the machine base, a clean air outlet is provided on the spherical cavity, the machine body is swingably arranged on the base in a circumferential direction, and the machine body can be manually rotated on the base to adjust the air outlet area;

[0007] The nose is swingably placed on the spherical cavity along a pitch angle, and the spherical cavity has an open portion for the nose to swing thereon to discharge air, and a guide portion extending and shielding the rear of the nose, the guide portion is arranged around the clean air outlet and guides part of the purified air into the nose, wherein the guide portion extending at the rear of the nose means that the guide portion extends at the air suction area at the rear of the nose;

[0008] The filtering device includes at least one purification channel and a circulation fan arranged in the machine body. The circulation fan is arranged at the end of the purification channel, and the circulation fan collects external air entering the machine body and passing through the purification channel, and then discharges the purified air from the clean air outlet to the machine head.

[0009] Furthermore, the rotating shaft of the circulating fan is vertically arranged, the purification channel is coaxially arranged with the rotating shaft of the circulating fan, and the opening of the purification channel faces the machine head, thereby increasing the flow of clean air purified by the filter element in the purification channel and increasing the working efficiency of the air circulation fan.

[0010] Further, the filtering component comprises:

[0011] A partition is mounted above the machine body, and the circulating motor is located on the partition;

[0012] The filter element is arranged between the bottom of the machine body and the partition;

[0013] An air inlet area is formed between the periphery of the filter element and the body, and a purification channel is formed in the inner cavity of the filter element.

[0014] Furthermore, a wind shield seat is provided on the partition, the lower end of the wind shield seat is connected to the circulation fan, and the upper end of the wind shield seat is connected to the clean air outlet, so that a closed air outlet channel is formed between the circulation fan and the clean air outlet, and the output efficiency of the clean air is guaranteed through the purification channel and the air outlet channel.

[0015] Furthermore, the end surface of the base is inclined downward relative to the horizontal plane so that the front of the head is exposed outside the spherical cavity, and the rear of the head is always kept in the spherical cavity, thereby increasing the air outlet space of the head and reducing the mixing of unpurified external air into the head.

[0016] Further, the machine head includes a cover body, a motor base connected to the cover body, and a pitch drive assembly, and the pitch drive assembly includes:

[0017] The bracket, the motor base is provided with a first shaft, and the motor base is rotatably connected to the top end of the bracket through the first shaft;

[0018] The second driving unit is arranged on a side of the motor base away from the first axis,

[0019] A rocker arm, provided at an output end of the second driving unit;

[0020] A connecting rod has one end hinged to the rocker arm and the other end hinged to the second axis of the bracket, the second axis is located below the first axis, and the second driving unit drives the rocker arm to rotate so that one end of the connecting rod presses against the motor seat, driving the motor seat and the cover body to rotate around the first axis.

[0021] Furthermore, the nose is spherically arranged, and the first axis is close to the axis of the nose, or the first axis passes through the center of the nose. Preferably, the first axis passes through the center of the nose, so that the rotation center of the nose is close to the center of gravity of the nose, thereby increasing the stability of the nose during pitch and roll swings, while maintaining a uniform gap between the spherical cavity and the cover body.

[0022] Furthermore, the open portion is coplanar with the spherical cavity and extends to the front of the machine base. When the machine head is in the minimum elevation angle state, the open portion is at least tangent to the bottom of the machine head air outlet, or is lower than the bottom of the machine head air outlet. Preferably, the open portion is tangent to the bottom of the machine head air outlet, and a guide edge is provided on the open portion tangentially downward to guide the air outlet direction and increase the directivity of the air outlet.

[0023] The guide portion is coplanar with the spherical cavity and extends to the rear of the machine base, and the guide portion is close to the horizontal height where the center of the machine head is located.

[0024] Furthermore, a swivel seat is provided at the bottom of the machine body, and a supporting member is provided at the bottom of the swivel seat in point-surface contact with the base, and the supporting member supports the swivel seat to rotatably float on the base, playing a role of circumferential support and reducing the axial deviation between the swivel seat and the base.

[0025] Furthermore, the base is provided with a circumferential drive assembly, including: a first drive motor, which is arranged away from the center of the base;

[0026] The transmission arm is driven to rotate by the first driving motor;

[0027] A sliding cavity is radially arranged at the bottom of the rotating seat, and the transmission arm is constrained in the sliding cavity so that the transmission arm drives the rotating seat to swing.

[0028] Compared with the prior art, the present invention has the following advantages and beneficial effects: 1. A spherical cavity is arranged on the top of the machine base, and the entire machine head is arranged in a spherical shape. The outer contour of the spherical cavity is larger than the contour of the machine head, so that when the machine head is swung at a pitch angle, the machine head is always kept in the spherical cavity, thereby ensuring the stability of the machine head when the machine body rotates circumferentially on the base;

[0029] 2. The circulating fan and the purification channel are coaxially arranged so that the air inlet of the circulating fan faces the end of the purification channel, and the air outlet of the circulating fan faces the clean air outlet of the machine base. When the clean air is discharged through the clean air outlet, it is guided by the spherical cavity and the fan in the machine head works, so that most of the clean air is output to the designated air outlet area by the machine head;

[0030] 3. The guide part is shielded at the rear of the machine head, so that when the clean air is discharged, the clean air at the edge of the clean air outlet is guided by the guide part with a spherical concave surface and then input into the machine head, while the unpurified air is partially shielded by the guide part, thereby increasing the clean air quality and improving the purification effect. The front part of the machine head extends out of the open part, thereby avoiding the influence of the machine base on the air outlet of the machine head and ensuring the air outlet effect;

[0031] 4. Fix the motor base to the machine head, and hinge the motor base on the fixed first axis, so as to limit the motor base to rotate only around the first axis. When in use, the second drive unit drives the rocker arm to rotate. Since the end of the connecting rod is hinged on the fixed second axis, the other end of the connecting rod presses and pushes the rocker arm, thereby providing power for the motor base, driving the motor base to drive the machine head to rotate at a certain angle, reducing the overall weight of the air outlet assembly, and making the rotation center close to the overall middle of the machine head, thereby increasing the stability of the pitch action.

[0032] 5. The center of the swivel seat is rotatably matched with the base, and a gap is formed between the outer periphery of the swivel seat and the base, so that the swivel seat can rotate around the center of the base. The first driving unit is arranged on one side of the center of the swivel seat. The first driving unit drives the transmission arm to rotate circumferentially, and the transmission arm is restricted in the sliding cavity, so that the transmission arm presses against the end wall of the sliding cavity and drives the swivel seat to swing to one side at a certain angle. The swivel seat is connected to the casing, so as to realize the swing of the entire body, and during the swinging process, the transmission arm is always limited in the sliding cavity, and the swivel seat and the base always maintain axial limitation, thereby greatly increasing the swinging stability.

[0033] When working, the circulating fan operates and draws external air into the air inlet area from the air inlet hole at the bottom of the body, and continues to be sucked into the purification channel in the air inlet area. The air is purified after passing through the filter element, forming clean air in the purification channel and output to the clean air outlet through the circulating fan, wherein the air inlet area is circumferentially arranged on the body to obtain sufficient air intake and increase the purification area, and the purification channel is coaxially arranged with the circulating fan, and the purification channel points axially to the clean air outlet, thereby effectively improving the air outlet efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0035] Figure 2 is a cross-sectional view of the present invention;

[0036] Figure 3 It is a partial structural schematic diagram of the machine head of the present invention;

[0037] Figure 4 It is a structural schematic diagram of the pitch drive assembly of the present invention;

[0038] Figure 5 It is a structural schematic diagram of the motor base of the present invention;

[0039] Figure 6 It is a schematic diagram of the structure of the swivel seat and circumferential drive assembly of the present invention;

[0040] Figure 7 It is a schematic diagram of the exploded structure of the swivel, the supporting member and the base of the present invention;

[0041] Figure 8 It is a schematic diagram of the base structure of the present invention;

[0042] In the figure: 1. base; 2. machine body; 2.1. machine base; 2.2. spherical cavity; 2.3. clean air outlet; 2.4. open part; 2.5. air guide part; 2.6. air inlet; 3. machine head; 3.1. cover; 3.2. motor base; 3.3. air outlet; 3.4. third drive unit; 3.5. slideway; 4. filter device; 4.1. purification channel; 4.2. circulating fan; 4.3. partition; 4.4. filter element; 4.5. air inlet area; 4.6. wind shield seat; 4.7, air outlet channel; 5, pitch drive assembly; 5.1, bracket; 5.2, first axis; 5.3, first drive unit; 5.4, rocker arm; 5.5, connecting rod; 5.6, second axis; 6, circumferential drive assembly; 6.1, first drive motor; 6.2, transmission arm; 7, rotating seat; 7.1, sliding cavity; 7.2, supporting member; 7.3, unit cavity; 7.4, elastic member; 7.5, sliding ring; 8, connecting arm; 8.1, positioning part; 8.2, connecting part; DETAILED DESCRIPTION

[0043] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0044] It should be understood that although the terms upper, middle, lower, top, end, etc. appear in this article to describe various elements, these elements are not limited by these terms. These terms are only used to distinguish elements from each other for easy understanding, and are not used to define any direction or order limitation.

[0045] like Figure 1-8 As shown, an air circulation fan comprises: a base 1;

[0046] The machine body 2 is provided in a hollow cavity, and a machine base 2.1 is provided on the top of the machine body 2. A spherical cavity 2.2 is provided in the machine base 2.1, and a clean air outlet 2.3 is provided on the spherical cavity 2.2.

[0047] The base 1 is provided with a circumferential drive assembly 6, and the output end of the circumferential drive assembly 6 is connected to the bottom of the body 2, so that the body 2 is swingably arranged on the base 1 in the circumferential direction;

[0048] The head 3 is spherically arranged and is swingably placed on the spherical cavity 2.2 along the pitch angle, and the spherical cavity 2.2 has an open portion 2.4 with a lower horizontal height and a guide portion 2.5 with a higher horizontal height. The head 3 is at least partially placed in the spherical cavity 2.2, and the open portion 2.4 is for the head 3 to swing on it to discharge air, and the guide portion 2.5 is shielded at the rear of the head 3. The guide portion 2.5 is arranged on the side of the clean air outlet 2.3 and guides part of the purified air into the head 3, wherein the extension of the guide portion at the rear of the head means that the guide portion extends at the air suction area at the rear of the head;

[0049] The filter device 4 includes a purification channel 4.1 and a circulation fan 4.2 arranged in the body 2. The circulation fan 4.2 is arranged at the end of the purification channel 4.1, and the circulation fan 4.2 collects external air entering the body 2 and passing through the purification channel 4.1, and then discharges the purified air from the clean air outlet 2.3.

[0050] Specifically, the open portion 2.4 is coplanar with the spherical cavity 2.2 and extends to the front of the base 2.1. When the head 3 is in the minimum elevation state, the open portion 2.4 is at least tangent to the bottom of the air outlet 3.3 of the head 3, or is lower than the bottom of the air outlet 3.3 of the head 3. Preferably, the open portion 2.4 is tangent to the bottom of the air outlet 3.3 of the head 3, and a guide edge is provided on the open portion 2.4 in a tangential direction downward, so as to guide the air outlet direction and increase the air outlet directionality;

[0051] The guide portion 2.5 is coplanar with the spherical cavity 2.2 and extends to the rear of the machine base 2.1, and the guide portion 2.5 is close to the horizontal height where the center of the machine head 3 is located.

[0052] As an embodiment of the present invention, a swivel seat 7 is provided at the bottom of the body 2, and the swivel seat 7 is axially limited on the base 1. A supporting member 7.2 is provided at the bottom of the swivel seat 7 in point-surface contact with the base 1, and the supporting member 7.2 supports the swivel seat 7 to float rotatably on the base 1, so that the body 2 can be manually rotated on the base 1 to adjust the air outlet area.

[0053] Specifically, a sliding ring 7.5 is provided on the base 1, and unit cavities 7.3 for inserting support members 7.2 are provided at intervals along the circumferential direction at the bottom of the swivel seat 7. An elastic member 7.4 is provided in the unit cavity 7.3. The elastic member 7.4 can specifically be a spring. The elastic member 7.4 drives the end of the support member 7.2 to slide or position against the sliding ring 7.5. The support member 7.2 is placed in the unit cavity 7.3, which increases the state stability of the support member 7.2 and avoids the tilt of the support member 7.2, thereby ensuring the auxiliary support effect of the support member 7.2 on the swivel seat 7. In addition, the multiple support members 7.2 arranged circumferentially compensate for the axial deviation between the swivel seat 7 and the base 1 through the elastic member 7.4, specifically enhancing the swing stability of the swivel seat 7.

[0054] In order to ensure the service life of the sliding ring 7.5, the material of the sliding ring 7.5 is POM.

[0055] Preferably, the lower end of the support member 7.2 is rounded, so that the support member 7.2 and the sliding ring 7.5 always maintain point-to-surface contact.

[0056] Specifically, the rotating shaft of the circulating fan 4.2 is vertically arranged, the purification channel 4.1 is coaxially arranged with the rotating shaft of the circulating fan 4.2, and the opening of the purification channel 4.1 faces the head 3, thereby increasing the flow of clean air purified by the filter element 4.4 in the purification channel 4.1 and increasing the working efficiency of the air circulation fan.

[0057] Specifically, the filtering component includes:

[0058] The partition 4.3 is erected on the upper part of the machine body 2, the circulating motor is located on the partition 4.3, and an air outlet corresponding to the size of the circulating fan 4.2 is arranged in the middle of the partition 4.3;

[0059] A filter element 4.4, the inner cavity of which forms a purification channel 4.1, the filter element 4.4 is arranged between the bottom of the body 2 and the partition 4.3, specifically, between the rotating seat 7 and the partition 4.3, and the outer walls of the partition 4.3 and the rotating seat 7 are in contact with the inner wall of the body 2, and the maximum outer diameter of the filter element 4.4 is smaller than the inner diameter of the inner wall of the body 2, so that the outer wall of the filter element 4.4, the inner wall of the body 2, the partition 4.3 and the outer edge of the rotating seat 7 extending from the filter element 4.4 form an air inlet area 4.5, and a plurality of air inlet holes 2.6 for air intake are arranged between the upper and lower areas formed by the rotating seat 7 and the partition 4.3 on the body 2.

[0060] The number of filter elements 4.4 can be one or more. When one filter element 4.4 is arranged in the machine body 2, the filter element 4.4 is vertically arranged in the machine body 2 along the vertical axis. When the number of filter elements 4.4 is multiple, the filter elements 4.4 are vertically arranged on the rotating seat 7 at intervals along the circumferential direction.

[0061] Specifically, a wind shield seat 4.6 is also provided on the partition 4.3, and the lower end of the wind shield seat 4.6 is connected to the circulation fan 4.2, and the upper end of the wind shield seat 4.6 is connected to the clean air outlet 2.3, so that a closed air outlet channel 4.7 is formed between the circulation fan 4.2 and the clean air outlet 2.3. The output efficiency of the clean air is guaranteed through the purification channel 4.1 and the air outlet channel 4.7. Among the above-mentioned components, the body 2, the circulation fan 4.2, the filter element 4.4, the wind shield seat 4.6, the partition 4.3, the rotating seat 7 and the base 1 are all coaxially arranged.

[0062] Specifically, the end surface of the base 2.1 is inclined downward with respect to the horizontal plane, and the inclination direction is toward the air outlet 3.3 of the head 3, so that the front of the head 3 is exposed outside the spherical cavity 2.2, and the rear of the head 3 is always kept in the spherical cavity 2.2, thereby increasing the air outlet space of the head 3 and reducing the mixing of unpurified air from the outside into the head 3.

[0063] As an embodiment of the present invention, the head 3 includes two covers 3.1, a motor base 3.2 connected to the rear cover 3.1, and a pitch drive assembly 5. As an explanation of the head 3 being swingable along the pitch angle, the pitch drive assembly 5 includes:

[0064] Brackets 5.1, the number of the brackets 5.1 is two, and the brackets 5.1 are erected on the base and extend out of the spherical cavity 2.2, the motor base 3.2 is provided with a first shaft 5.2, and the motor base 3.2 is rotatably connected to the top of the brackets 5.1 through the first shaft 5.2;

[0065] The second driving unit is arranged on the side of the motor base 3.2 away from the first axis 5.2,

[0066] A rocker arm 5.4, provided at the output end of the second drive unit;

[0067] The connecting rod 5.5 is hinged at one end to the rocker arm 5.4, and at the other end to the second axis 5.6 of the bracket 5.1. The second axis 5.6 is located below the first axis 5.2. The second driving unit drives the rocker arm 5.4 to rotate so that one end of the connecting rod 5.5 presses against the motor base 3.2, driving the motor base 3.2 and the cover body 3.1 to rotate around the first axis 5.2.

[0068] Specifically, the pitch drive assembly 5 further includes a connecting arm 8, on which is provided at least one positioning portion 8.1 and at least two connecting portions 8.2 connected to the bracket 5.1, and the second axis 5.6 is located on the positioning portion 8.1 or the connecting portion 8.2. The setting of the positioning portion 8.1 facilitates the installation of the connecting arm 8 and the stability of the air outlet assembly.

[0069] Specifically, the bracket 5.1 is in the shape of a sheet, and a slide groove 3.5 is provided at the rear bottom of the nose 3. The bracket 5.1 extends into the slide groove 3.5. The slide groove 3.5 is arranged in a narrow and long shape. The slide groove 3.5 has an initial end and a terminal end. In the initial state of the nose 3, the initial end of the slide groove 3.5 is close to the central axis of the body 2, and the two brackets 5.1 are supported on the nose 3 to increase the stability of the pitch action.

[0070] Specifically, the head 3 is spherically arranged, and the first axis 5.2 is close to the axis of the head 3, or the first axis 5.2 passes through the center of the head 3. Preferably, the first axis 5.2 passes through the center of the head 3, so that the rotation center of the head 3 is close to the center of gravity of the head 3, thereby increasing the stability of the head 3 during pitch and roll swings, and at the same time, maintaining a uniform gap between the spherical cavity 2.2 and the cover body 3.1.

[0071] When the nose 3 moves along the pitch angle, the second drive unit drives the rocker arm 5.4 to rotate. Since the end of the connecting rod 5.5 is hinged on the fixed second shaft 5.6, the other end of the connecting rod 5.5 presses and pushes the rocker arm 5.4, thereby providing power for the motor base 3.2, driving the motor base 3.2 to drive the nose 3 to rotate at a certain angle, reducing the overall weight of the air outlet assembly, and making the rotation center close to the overall middle of the nose 3, thereby increasing the stability of the pitch action.

[0072] As an embodiment of the present invention, as an explanation of the circumferential swingability of the body 2, the base 1 is provided with a circumferential drive assembly 6, comprising: a first drive motor 6.1, which is arranged away from the center of the base 1;

[0073] The transmission arm 6.2 is driven to rotate by the first driving motor 6.1;

[0074] A sliding cavity 7.1 is radially provided at the bottom of the rotating seat 7, and the transmission arm 6.2 is constrained in the sliding cavity 7.1, so that the transmission arm 6.2 drives the rotating seat 7 to swing.

[0075] Specifically, the sliding cavity 7.1 is linearly arranged along the radial direction of the rotating seat 7, and the width of the sliding cavity 7.1 corresponds to the end of the transmission arm 6.2, so that the transmission arm 6.2 is always limited in the sliding cavity 7.1, reducing the setback of the transmission arm 6.2 and the sliding cavity 7.1.

[0076] When the body 2 rotates about the circumferential direction, at the initial position of the body 2, the transmission arm 6.2, the sliding cavity 7.1 and the center of the rotating seat 7 are in the same straight line. At this time, the transmission arm 6.2 is relatively close to the center of the rotating seat 7. When the transmission arm 6.2 rotates 90°, the rotating seat 7 swings to the extreme position. As the transmission arm 6.2 continues to rotate to 180°, the rotating seat 7 swings toward the other side at a certain angle until it returns to the initial position. At this time, the transmission arm 6.2, the sliding cavity 7.1 and the center of the rotating seat 7 are in the same straight line, and the transmission arm 6.2 is relatively far away from the center of the rotating seat 7.

[0077] When the transmission arm 6.2 rotates 270°, the swivel seat 7 swings to another extreme position. As the transmission arm 6.2 continues to rotate 90°, the swivel seat 7 swings toward the other side at a certain angle until it returns to the initial position.

[0078] A third driving unit 3.4 for driving the fan blades is also provided at the front of the motor base 3.2. The first driving unit 5.3, the second driving unit and the third driving unit 3.4 are motors.

[0079] This specific embodiment is merely an explanation of the present invention and is not a limitation of the present invention. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed. However, as long as they are within the scope of the claims of the present invention, they are protected by the patent law.

Claims

1. An air circulation fan, characterized in that: include: Base (1); A machine body (2), wherein a machine base (2.1) is provided on the top of the machine body (2), a spherical cavity (2.2) is provided in the machine base (2.1), a clean air outlet (2.3) is provided on the spherical cavity (2.2), and the machine body (2) is swung on the base (1) in a circumferential direction; The head (3) is spherically arranged and can be swung along a pitch angle on the spherical cavity (2.2) and is always kept in the spherical cavity. The spherical cavity (2.2) has an open portion (2.4) with a relatively low horizontal height and a guide portion (2.5) with a relatively high horizontal height. The front portion of the head extends over the open portion, and the guide portion (2.5) extends to the air suction area at the rear of the head (3). The guide portion (2.5) is arranged around the clean air outlet (2.3) and guides part of the purified air into the head (3). The filter device (4) comprises at least one purification channel (4.1) and a circulation fan (4.2) arranged in the machine body (2), wherein the circulation fan (4.2) collects external air that enters the machine body (2) and passes through the purification channel (4.1), and then discharges the purified air from the clean air outlet (2.3) to the machine head (3).

2. An air circulation fan according to claim 1, characterized in that: The purification channel (4.1) is coaxially arranged with the rotating shaft of the circulating fan (4.2), and the opening of the purification channel (4.1) faces the machine head (3).

3. An air circulation fan according to claim 1, characterized in that: The filtering device comprises: A partition (4.3) is mounted on the upper part of the machine body (2), and the circulating fan is located on the partition (4.3); A filter element (4.4) is disposed between the bottom of the machine body (2) and the partition plate (4.3); An air inlet area (4.5) is formed between the periphery of the filter element (4.4) and the machine body (2), and a purification channel (4.1) is formed in the inner cavity of the filter element (4.4).

4. An air circulation fan according to claim 3, characterized in that: The partition plate (4.3) is also provided with a wind shield seat (4.6), the lower end of the wind shield seat (4.6) is connected to the circulation fan (4.2), and the upper end of the wind shield seat (4.6) is connected to the clean air outlet (2.3), so that a closed air outlet channel (4.7) is formed between the circulation fan (4.2) and the clean air outlet (2.3).

5. The air circulation fan according to claim 3, characterized in that: The end surface of the machine base (2.1) is tilted downward relative to the horizontal plane so that the front part of the machine head (3) is exposed outside the spherical cavity (2.2), and the rear part of the machine head (3) is always kept in the spherical cavity (2.2).

6. The air circulation fan according to claim 1, characterized in that: The machine head (3) comprises a cover body (3.1), a motor base (3.2) connected to the cover body (3.1), and a pitch drive assembly (5), wherein the pitch drive assembly (5) comprises: A bracket (5.1), wherein a first shaft (5.2) is provided on the motor base (3.2), and the motor base (3.2) is rotatably connected to the top end of the bracket (5.1) via the first shaft (5.2); The second drive unit is arranged on a side of the motor base (3.2) away from the first axis (5.2), A rocker arm (5.4), arranged at the output end of the second driving unit; The connecting rod (5.5) has one end hinged to the rocker arm (5.4) and the other end hinged to the second shaft (5.6) of the bracket (5.1), the second shaft (5.6) being located below the first shaft (5.2), and the second driving unit drives the rocker arm (5.4) to rotate so that one end of the connecting rod (5.5) presses against the motor seat (3.2), thereby driving the motor seat (3.2) and the cover body (3.1) to rotate around the first shaft (5.2).

7. An air circulation fan according to claim 6, characterized in that: The machine head (3) is arranged in a spherical shape, and the first axis (5.2) is close to the axis of the machine head (3), or the first axis (5.2) passes through the center of the machine head (3).

8. The air circulation fan according to claim 1, characterized in that: The spherical cavity (2.2) is also provided with an open portion (2.4) on which the machine head (3) swings to discharge air, and the open portion (2.4) is coplanar with the spherical cavity (2.2) and extends to the front of the machine base (2.1), and when the machine head (3) is in a state of minimum elevation angle, the open portion (2.4) is at least tangent to the bottom of the air outlet (3.3) of the machine head (3), or is lower than the bottom of the air outlet (3.3) of the machine head (3); The flow guide portion (2.5) is coplanar with the spherical cavity (2.2) and extends to the rear of the machine base (2.1), and the flow guide portion (2.5) is close to the horizontal height where the center of the machine head (3) is located.

9. The air circulation fan according to claim 1, characterized in that: A rotating seat (7) is provided at the bottom of the machine body (2), and a supporting component (7.2) which is in point-surface contact with the base (1) is provided at the bottom of the rotating seat (7), and the supporting component (7.2) supports the rotating seat (7) so that it can rotate and float on the base (1).

10. An air circulation fan according to claim 9, characterized in that: The base (1) is provided with a circumferential drive assembly (6), comprising: a first drive motor (6.1) arranged offset from the center of the base (1); The transmission arm (6.2) is driven to rotate by the first driving motor (6.1); A sliding cavity (7.1) is radially provided at the bottom of the rotating seat (7), and the transmission arm (6.2) is constrained in the sliding cavity (7.1) so that the transmission arm (6.2) drives the rotating seat (7) to swing.

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