A fan

Abstract

The present application discloses a fan, comprising: a base, the base having an installation cavity and an air inlet and an air outlet connected to the installation cavity; a fan seat, the fan seat is arranged in the installation cavity, and the fan seat is fixedly connected to the base; a fan, the fan is installed on the fan seat; a tower body, the tower body is rotatably connected to the air outlet, the tower body has a cavity connected to the installation cavity, and a transparent part connected to the cavity is arranged on the outer wall of the tower body; a passive impeller, the passive impeller is arranged in the installation cavity and / or in the cavity, and the passive impeller is fixedly connected to the tower body; when the fan is rotating, a flow air path from the air inlet to the air outlet is formed in the base to drive the passive impeller, so that the passive impeller drives the tower body to rotate. There is no need to set a separate motor to drive the tower body to rotate, saving costs and reducing the volume of the entire fan.

Description

Technical Field

[0001] The present application relates to the technical field of fans, and in particular to a tower fan. Background Art

[0002] As for the traditional electric fan with shaking fan blades, the whole is a tower-shaped structure. The motor in the base drives the fan blades to generate wind, and the wind is transported to the front of the tower fan through the air duct and blown out. Then there is a problem. The wind volume covers a small range, and often only people in the front can blow it. If it is slightly to the side, no wind can be blown. The existing solution is to separate the base of the tower fan and the columnar air outlet tower above, and connect a shaking servo motor in the base through a rotating shaft at the bottom of the air outlet tower. The fan requirements are controlled by a separate motor to improve the coverage range. In this case, the cost of this fan is relatively high, and the price is also high. Summary of the invention

[0003] The disclosed embodiment of the present invention provides a fan to solve the problems of the existing foldable fan having a complex structure, high cost and inaccurate folding angle detection.

[0004] In order to solve the above problems, the present invention discloses the following technical solutions:

[0005] The disclosed embodiment of the present invention provides a fan, comprising:

[0006] A base, the base having a mounting cavity and an air inlet and an air outlet connected to the mounting cavity;

[0007] A fan seat, which is arranged in the installation cavity and fixedly connected to the base;

[0008] A fan is installed on the fan seat.

[0009] A tower body, the tower body is rotatably connected to the air outlet, the tower body has a cavity connected to the installation cavity, and a transparent portion connected to the cavity is arranged on the outer wall of the tower body;

[0010] A passive impeller, the passive impeller is arranged in the installation cavity and / or in the cavity, and the passive impeller is fixedly connected to the tower body;

[0011] When the fan is rotating, a flow path from the air inlet to the air outlet is formed in the base to drive the passive impeller, so that the passive impeller drives the tower body to rotate.

[0012] In the above scheme, the wind force itself cooperates with the structure with a passive impeller to drive the upper air outlet tower body to rotate as a whole. An impeller that can rotate under the blowing of wind is set on the air outlet surface, and the impeller is driven to rotate by the obliquely set blades on itself. Such a passive impeller is set at the intersection of the base and the upper air outlet tower body. When the wind force generated in the base moves into the air outlet tower, it passes through the passive impeller, and the passive impeller drives the entire air outlet tower body to rotate under the action of wind force, so the effect of rotating the air outlet in all directions can be achieved. There is no need to set up a separate motor to drive the tower body to rotate, which saves costs and reduces the volume of the entire fan.

[0013] In a possible implementation manner, the fan includes a shaft; one end of the shaft is fixedly connected to the fan base, and the other end extends out of the air outlet;

[0014] The passive impeller comprises an inner ring portion and an outer ring portion, the inner ring portion and the outer ring portion are connected, and a first air duct connecting the installation cavity and the cavity is formed between the inner ring portion and the outer ring portion;

[0015] The inner ring portion is rotatably connected to the shaft body, and the tower body and the outer ring portion are fixedly connected.

[0016] In the above scheme, the shaft body provides support to make the tower body more stable, and rotatably fixes the inner ring of the passive impeller, so that the passive impeller rotates under the wind and drives the tower body to rotate.

[0017] In a possible implementation manner, the outer ring portion includes a straight section and a tapered section that gradually expands outward from the end of the straight section;

[0018] The conical cylinder section is arranged in the installation cavity, and the straight cylinder section extends out of the air outlet and is connected to the tower body;

[0019] The passive impeller further includes a plurality of first blades arranged on the inner wall of the cone section along the circumferential direction of the cone section.

[0020] In the above scheme, a conical transition section extending from the fan to the tower body is provided, which can gather the wind into the tower body, form a wind flow channel and increase the wind speed. The blades of the passive impeller are provided in the conical section, and the blades penetrate the entire conical section in the vertical direction, so that the wind receiving area is large, and the tower body rotates faster under the drive of the passive impeller.

[0021] In a possible implementation, the fan base includes an inner cylinder wall and an outer cylinder wall, the outer cylinder wall is connected to the inner cylinder wall, and a second air duct is formed between the outer cylinder wall and the inner cylinder wall;

[0022] The wide mouth end of the conical cylinder section is arranged around the outer cylinder wall.

[0023] In the above scheme, the fan base fixes the fan and guides the wind generated by the fan to the passive impeller, thereby driving the passive impeller to rotate.

[0024] Furthermore, a guide plate is provided between the outer cylinder wall and the inner cylinder wall, and the guide plate forms a certain angle with the blades of the passive impeller, so that the guided wind also forms a certain angle with the blades of the passive impeller, thereby applying circumferential force to the blades, causing the passive impeller to rotate smoothly.

[0025] In a possible implementation manner, the passive impeller includes a second blade that is disposed between the inner ring portion and the outer ring portion and connects the inner ring portion and the outer ring portion, and the second blade is disposed at an angle.

[0026] In the above scheme, the passive impeller blades are tilted, and when the wind blows vertically toward the blades, the passive impeller will be driven to rotate. In addition, the blade area is small, the wind is small, and the rotation speed is slow.

[0027] In a possible implementation manner, the fan includes a conical cover disposed in the installation cavity, a wide end of the conical cover faces the fan seat, and a narrow end of the conical cover extends to the inner side of the outer ring portion.

[0028] In the above scheme, the conical cover is a conical transition section extending from the wind turbine to the tower body, which can gather the wind into the tower body, form a wind flow channel and increase the wind speed.

[0029] In a possible implementation manner, the outer ring portion includes a first ring wall and a second ring wall, and an annular slot is formed between the first ring wall and the second ring wall;

[0030] The tower body is cylindrical and is inserted into the annular slot.

[0031] In the above scheme, the tower body is fixedly connected to the passive impeller by plugging, which makes it convenient for the passive impeller to drive the tower body to rotate, and the connection structure is simple, which is convenient for disassembly, assembly, transportation and maintenance.

[0032] In a possible implementation manner, a shaft sleeve portion is fixedly connected to the fan base, and the shaft body is plugged and fixed to the shaft sleeve portion;

[0033] The fan is installed on a side of the fan seat away from the shaft sleeve portion, and the output shaft of the fan is arranged on an end of the fan away from the shaft sleeve portion.

[0034] In the above solution, the shaft body is plugged and fixed on the shaft sleeve, so that the tower body is more stable.

[0035] In a possible implementation, the base includes a base shell, a base platform and a grid cover;

[0036] The air inlet and the air outlet are arranged on the base shell;

[0037] The grid cover body includes an inner ring body and an annular grid portion circumferentially arranged around the inner ring body; the outer ring of the annular grid portion is connected to the air inlet, and the inner ring body is clamped on the base platform so that there is a gap between the annular grid portion and the base platform.

[0038] In the above solution, the base platform supports the base shell so that the grille cover is suspended in the air, better exposed to the outside, and easier to take in air.

[0039] In a possible implementation manner, a support component is connected to the top of the tower body, and a bearing is provided between the support component and the shaft body;

[0040] The end of the shaft body extends out of the bearing; and an external thread is provided on the shaft section of the shaft body extending out of the bearing;

[0041] The fan further comprises a rotary cover, the rotary cover is threadedly connected to the bearing, and the rotary cover has a ring edge;

[0042] When the rotary cover moves along the axial direction of the shaft body to approach the supporting component, the annular edge presses the supporting component to lock the tower body.

[0043] In the above scheme, a rotary cover is provided to facilitate adjustment of whether the tower body rotates during use, and selection can be made according to needs.

[0044] The technical solution adopted in the embodiments disclosed in the present invention can achieve the following beneficial effects:

[0045] The fan of the present application drives the upper air outlet tower to rotate as a whole by the wind itself and the structure with a passive impeller. An impeller that can rotate under the blowing of wind is set on the air outlet surface. The impeller rotates through the obliquely arranged blades on itself. When it does not need to rotate, it can be locked by a disc nut in the middle. There is no need to set up a separate motor to drive the tower to rotate, which saves costs and reduces the size of the entire fan.

[0046] Such a passive impeller is arranged at the junction of the base and the air outlet tower body above. When wind is generated in the base and moves toward the air outlet tower, it passes through the passive impeller. The passive impeller drives the entire air outlet tower body to rotate under the action of wind, so the effect of rotating air in all directions can be achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] The drawings described herein are used to provide a further understanding of the disclosure of the present invention and constitute a part of the disclosure of the present invention. The illustrative embodiments of the disclosure of the present invention and their descriptions are used to explain the disclosure of the present invention and do not constitute an improper limitation on the disclosure of the present invention. In the drawings:

[0048] Figure 1 A schematic diagram of the three-dimensional structure of a fan provided in Embodiment 1 of the present application;

[0049] Figure 2 A cross-sectional view of a fan provided in Embodiment 1 of the present application;

[0050] Figure 3 A cross-sectional view of a base of a fan provided in Embodiment 1 of the present application;

[0051] Figure 4 This is a schematic diagram of the structure of the fan provided in Example 2 of the present application.

[0052] Figure 5 A cross-sectional view of the fan provided in Embodiment 2 of the present application.

[0053] In the figure:

[0054] Base 1, base platform 11, grid cover body 12, fan base 2, inner cylinder wall 21, outer cylinder wall 22, fan 3, tower body 4, passive impeller 5, inner ring part 51, outer ring part 52, straight cylinder section 521, conical cylinder section 522, first blade 53, second blade 54, shaft body 6, conical cover 7, drainage plate 8, and rotary cover 9. DETAILED DESCRIPTION

[0055] In order to make the purpose, technical solutions and advantages disclosed in the present invention clearer, the technical solutions disclosed in the present invention will be clearly and completely described below in combination with the specific embodiments disclosed in the present invention and the corresponding drawings. Obviously, the described embodiments are only part of the embodiments disclosed in the present invention, not all of them. Based on the embodiments disclosed in the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection disclosed in the present invention.

[0056] The terms "first", "second", etc. in the specification and claims of the present invention are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the terms used in this way are interchangeable under appropriate circumstances, so that the embodiments disclosed in the present invention can be implemented in an order other than those illustrated or described herein. In addition, the term "and / or" in the specification and claims means at least one of the connected objects, and the character " / " generally indicates that the objects associated with each other are in an "or" relationship.

[0057] The technical solutions disclosed in various embodiments of the present invention are described in detail below in conjunction with the accompanying drawings.

[0058] Embodiment 1

[0059] See also Figures 1 to 3As shown, the present application provides a fan, which includes a base 1, a fan base 2, a fan 3, a tower body 4 and a passive impeller 5. The base 1 has an installation cavity and an air inlet and an air outlet connected to the installation cavity; the fan base 2 is arranged in the installation cavity, and the fan base 2 is fixedly connected to the base 1; the fan 3 is installed on the fan base 2. The tower body 4 is rotatably connected to the air outlet, the tower body 4 has a cavity connected to the installation cavity, and a transparent part connected to the cavity is arranged on the outer wall of the tower body; the passive impeller 5 is arranged in the installation cavity and / or in the cavity, and the passive impeller 5 is fixedly connected to the tower body 4; when the fan 3 rotates, a flow air path from the air inlet to the air outlet is formed in the base 1 to drive the passive impeller 5, so that the passive impeller 5 drives the tower body 4 to rotate. The wind force itself cooperates with the structure with the passive impeller 5 to drive the upper air outlet tower body 4 to rotate as a whole. An impeller that can rotate under the blowing of wind is set on the air outlet surface, and the impeller rotates through the obliquely set blades on itself. Such a passive impeller 5 is set at the intersection of the base 1 and the upper air outlet tower body 4. When the wind force generated in the base 1 moves into the air outlet tower, the passive impeller 5 passes through the passive impeller 5, and the passive impeller 5 drives the entire air outlet tower body 4 to rotate under the action of wind force, so the effect of rotating the air in all directions can be achieved. There is no need to set up a separate motor to drive the tower body 4 to rotate, which saves costs and reduces the volume of the entire fan.

[0060] The tower body 4 is provided with an air outlet, which can be vertically arranged or spirally arranged along the tower body 4 .

[0061] The fan further comprises a shaft body 6; one end of the shaft body 6 is fixedly connected to the fan base 2, and the other end extends out of the air outlet; the passive impeller 5 comprises an inner ring portion 51 and an outer ring portion 52, the inner ring portion 51 and the outer ring portion 52 are connected, and a first air duct connecting the mounting cavity and the cavity is formed between the inner ring portion 51 and the outer ring portion 52; the inner ring portion 51 is rotatably connected to the shaft body 6, and the tower body 4 is fixedly connected to the outer ring portion 52. The shaft body 6 provides support to make the tower body 4 more stable, and rotatably fixes the inner ring portion 51 of the passive impeller 5, so that the passive impeller 5 rotates under the wind, thereby driving the tower body 4 to rotate.

[0062] The outer ring portion 52 includes a straight section 521 and a conical section 522 gradually expanding outward from the end of the straight section 521; the conical section 522 is arranged in the installation cavity, and the straight section 521 extends out of the air outlet and is connected to the tower body 4; the passive impeller 5 also includes a plurality of first blades 53 arranged on the inner wall of the conical section 522 along the circumference of the conical section 522. A conical transition section extending from the fan 3 to the tower body 4 is provided, which can gather the wind into the tower body 4, form a wind flow channel and increase the wind speed. The blades of the passive impeller 5 are arranged in the conical section 522, and the blades penetrate the entire conical section 522 in the vertical direction, so that the wind receiving area is large, and the tower body 4 rotates faster under the drive of the passive impeller 5. The fan base 2 includes an inner cylinder wall 21 and an outer cylinder wall 22, the outer cylinder wall 22 is connected to the inner cylinder wall 21, and a second air duct is formed between the outer cylinder wall 22 and the inner cylinder wall 21; the wide-mouth end of the conical cylinder section 522 is arranged around the outer cylinder wall 22. The base fixes the fan 3 and guides the wind generated by the fan 3 to the passive impeller 5, blowing the passive impeller 5 to rotate. Furthermore, a guide plate 8 is arranged between the outer cylinder wall 22 and the inner cylinder wall 21, and the guide plate 8 forms a certain angle with the blades of the passive impeller 5, so that the guided wind also forms a certain angle with the blades of the passive impeller 5, thereby applying a circumferential force to the blades, so that the passive impeller 5 rotates, and the rotation is stable.

[0063] Furthermore, the outer ring portion 52 includes a first annular wall and a second annular wall, and an annular slot is formed between the first annular wall and the second annular wall; the tower body 4 is cylindrical, and the tower body 4 is inserted into the annular slot. The tower body 4 is fixedly connected to the passive impeller 5 by plugging, which is convenient for the passive impeller 5 to drive the tower body 4 to rotate, and the connection structure is simple, which is convenient for disassembly, transportation, maintenance, etc. The fan base 2 is fixedly connected with a shaft sleeve portion, and the shaft body 6 is plugged and fixed on the shaft sleeve portion; the fan 3 is installed on the side of the fan base 2 away from the shaft sleeve portion, and the output shaft of the fan 3 is arranged on the end of the fan 3 away from the shaft sleeve portion. The shaft body 6 is plugged and fixed on the shaft sleeve portion, making the tower body 4 more stable.

[0064] The base 1 includes a base 1 shell, a base platform 11 and a grid cover 12; the base 1 shell is provided with the air inlet and the air outlet; the grid cover 12 includes an inner ring body and an annular grid portion arranged around the inner ring body; the outer ring of the annular grid portion is connected to the air inlet, and the inner ring body is clamped on the base platform 11, so that there is a gap between the annular grid portion and the base platform 11. The base platform 11 supports the base 1 shell, so that the grid cover is suspended in the air, better exposed to the outside, and easier to enter the air. The top of the tower body 4 is connected with a support component, and a bearing is arranged between the support component and the shaft body 6; the end of the shaft body 6 extends out of the bearing; and the shaft section of the shaft body 6 extending out of the bearing is provided with an external thread; the fan also includes a rotary cover 9, which is threadedly connected to the bearing, and the rotary cover 9 has a ring edge; in the process of the rotary cover 9 moving along the axial direction of the shaft body 6 to approach the support component, the ring edge presses the support component to lock the tower body 4. The rotary cover 9 is provided to facilitate the adjustment of whether the tower body 4 rotates during use, and the selection can be made according to needs.

[0065] Embodiment 2

[0066] See also Figures 4 to 5 As shown, the present application provides a fan, which includes a base 1, a fan base 2, a fan 3, a tower body 4 and a passive impeller 5. The base 1 has an installation cavity and an air inlet and an air outlet connected to the installation cavity; the fan base 2 is arranged in the installation cavity, and the fan base 2 is fixedly connected to the base 1; the fan 3 is installed on the fan base 2. The tower body 4 is rotatably connected to the air outlet, the tower body 4 has a cavity connected to the installation cavity, and a transparent part connected to the cavity is arranged on the outer wall of the tower body; the passive impeller 5 is arranged in the installation cavity and / or in the cavity, and the passive impeller 5 is fixedly connected to the tower body 4; when the fan 3 rotates, a flow air path from the air inlet to the air outlet is formed in the base 1 to drive the passive impeller 5, so that the passive impeller 5 drives the tower body 4 to rotate. The wind force itself cooperates with the structure with the passive impeller 5 to drive the upper air outlet tower body 4 to rotate as a whole. An impeller that can rotate under the blowing of wind is set on the air outlet surface, and the impeller rotates through the obliquely set blades on itself. Such a passive impeller 5 is set at the intersection of the base 1 and the upper air outlet tower body 4. When the wind force generated in the base 1 moves into the air outlet tower, the passive impeller 5 passes through the passive impeller 5, and the passive impeller 5 drives the entire air outlet tower body 4 to rotate under the action of wind force, so the effect of rotating the air in all directions can be achieved. There is no need to set up a separate motor to drive the tower body 4 to rotate, which saves costs and reduces the volume of the entire fan.

[0067] The fan includes a shaft body 6; one end of the shaft body 6 is fixedly connected to the fan base 2, and the other end extends out of the air outlet; the passive impeller 5 includes an inner ring portion 51 and an outer ring portion 52, the inner ring portion 51 and the outer ring portion 52 are connected, and a first air duct connecting the mounting cavity and the cavity is formed between the inner ring portion 51 and the outer ring portion 52; the inner ring portion 51 is rotatably connected to the shaft body 6, and the tower body 4 is fixedly connected to the outer ring portion 52. The shaft body 6 provides support to make the tower body 4 more stable, and rotatably fixes the inner ring portion 51 of the passive impeller 5, so that the passive impeller 5 rotates under the wind, thereby driving the tower body 4 to rotate.

[0068] The passive impeller 5 includes a second blade 54 disposed between the inner ring portion and the outer ring portion and connecting the inner ring portion and the outer ring portion, and the second blade 54 is disposed obliquely. The blades of the passive impeller 5 are disposed obliquely, and when the wind blows vertically toward the blades, the passive impeller 5 will be driven to rotate. Moreover, the blade area is small, the wind resistance is small, and the rotation speed is slow. The fan includes a conical cover 7 disposed in the mounting cavity, the wide mouth end of the conical cover 7 faces the fan seat 2, and the narrow mouth end of the conical cover 7 extends to the inner side of the outer ring portion 52. The conical cover 7 is a conical transition section extending from the fan 3 to the tower body 4, which can gather the wind into the tower body 4, form a wind flow channel and increase the wind speed.

[0069] Furthermore, the outer ring portion 52 includes a first annular wall and a second annular wall, and an annular slot is formed between the first annular wall and the second annular wall; the tower body 4 is cylindrical, and the tower body 4 is inserted into the annular slot. The tower body 4 is fixedly connected to the passive impeller 5 by plugging, which is convenient for the passive impeller 5 to drive the tower body 4 to rotate, and the connection structure is simple, which is convenient for disassembly, transportation, maintenance, etc. The fan base 2 is fixedly connected with a shaft sleeve portion, and the shaft body 6 is plugged and fixed on the shaft sleeve portion; the fan 3 is installed on the side of the fan base 2 away from the shaft sleeve portion, and the output shaft of the fan 3 is arranged on the end of the fan 3 away from the shaft sleeve portion. The shaft body 6 is plugged and fixed on the shaft sleeve portion, making the tower body 4 more stable.

[0070] The base 1 includes a base 1 shell, a base platform 11 and a grid cover 12; the base 1 shell is provided with the air inlet and the air outlet; the grid cover 12 includes an inner ring body and an annular grid portion arranged around the inner ring body; the outer ring of the annular grid portion is connected to the air inlet, and the inner ring body is clamped on the base platform 11, so that there is a gap between the annular grid portion and the base platform 11. The base platform 11 supports the base 1 shell, so that the grid cover is suspended in the air, better exposed to the outside, and easier to enter the air. The top of the tower body 4 is connected with a support component, and a bearing is arranged between the support component and the shaft body 6; the end of the shaft body 6 extends out of the bearing; and the shaft section of the shaft body 6 extending out of the bearing is provided with an external thread; the fan also includes a rotary cover 9, which is threadedly connected to the bearing, and the rotary cover 9 has a ring edge; in the process of the rotary cover 9 moving along the axial direction of the shaft body 6 to approach the support component, the ring edge presses the support component to lock the tower body 4. The rotary cover 9 is provided to facilitate the adjustment of whether the tower body 4 rotates during use, and the selection can be made according to needs.

[0071] The fan in the second embodiment is different from the fan in the first embodiment mainly in the setting of the position of the passive impeller 5 and the area of ​​the blades on the passive impeller 5, so that the rotation speeds of the tower body 4 in the two cases are different and can be selected according to needs and use environment.

[0072] The embodiments of the present invention are described above in conjunction with the accompanying drawings, but the present invention is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present invention, ordinary technicians in this field can make many forms without departing from the purpose of the present invention and the scope of protection of the claims, all of which are within the protection of the present invention.

Claims

1. A fan, characterized in that: include: A base, the base having a mounting cavity and an air inlet and an air outlet connected to the mounting cavity; A fan seat, which is arranged in the installation cavity and fixedly connected to the base; A fan, wherein the fan is mounted on the fan base; A tower body, the tower body is rotatably connected to the air outlet, the tower body has a cavity connected to the installation cavity, and a transparent portion connected to the cavity is arranged on the outer wall of the tower body; A passive impeller, the passive impeller is arranged in the installation cavity and / or in the cavity, and the passive impeller is fixedly connected to the tower body; When the fan is rotating, a flow path from the air inlet to the air outlet is formed in the base to drive the passive impeller, so that the passive impeller drives the tower body to rotate; Wherein, the fan comprises a shaft; one end of the shaft is fixedly connected to the fan base, and the other end extends out of the air outlet; The passive impeller comprises an inner ring portion and an outer ring portion, the inner ring portion and the outer ring portion are connected, and a first air duct connecting the installation cavity and the cavity is formed between the inner ring portion and the outer ring portion; The inner ring portion is rotatably connected to the shaft body, and the tower body and the outer ring portion are fixedly connected; Wherein, the base comprises a base shell, a base platform and a grid cover; The air inlet and the air outlet are arranged on the base shell; The grid cover body includes an inner ring body and an annular grid portion circumferentially arranged around the inner ring body; the outer ring of the annular grid portion is connected to the air inlet, and the inner ring body is clamped on the base platform so that there is a gap between the annular grid portion and the base platform.

2. The fan according to claim 1, characterized in that The outer ring portion includes a straight section and a tapered section that gradually expands outward from the end of the straight section; The conical cylinder section is arranged in the installation cavity, and the straight cylinder section extends out of the air outlet and is connected to the tower body; The passive impeller further includes a plurality of first blades arranged on the inner wall of the cone section along the circumferential direction of the cone section.

3. The fan according to claim 2, characterized in that: The fan base comprises an inner cylinder wall and an outer cylinder wall, the outer cylinder wall is connected to the inner cylinder wall, and a second air duct is formed between the outer cylinder wall and the inner cylinder wall; The wide mouth end of the conical cylinder section is arranged around the outer cylinder wall.

4. The fan according to claim 1, characterized in that: The passive impeller includes a second blade that is disposed between the inner ring portion and the outer ring portion and connects the inner ring portion and the outer ring portion, and the second blade is disposed obliquely.

5. The fan according to claim 4, characterized in that: The fan comprises a conical cover arranged in the installation cavity, the wide end of the conical cover faces the fan seat, and the narrow end of the conical cover extends to the inner side of the outer ring part.

6. The fan according to claim 4, characterized in that: The outer ring portion includes a first ring wall and a second ring wall, and an annular slot is formed between the first ring wall and the second ring wall; The tower body is cylindrical and is inserted into the annular slot.

7. The fan according to claim 1, characterized in that: The fan base is fixedly connected with a shaft sleeve, and the shaft body is plugged and fixed on the shaft sleeve; The fan is installed on a side of the fan seat away from the shaft sleeve portion, and the output shaft of the fan is arranged on an end of the fan away from the shaft sleeve portion.

8. The fan according to claim 1, characterized in that The top of the tower body is connected to a supporting component, and a bearing is provided between the supporting component and the shaft body; The end of the shaft body extends out of the bearing; and an external thread is provided on the shaft section of the shaft body extending out of the bearing; The fan further comprises a rotary cover, the rotary cover is threadedly connected to the bearing, and the rotary cover has a ring edge; When the rotary cover moves along the axial direction of the shaft body to approach the supporting component, the annular edge presses the supporting component to lock the tower body.

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