Axial flow fan with special purpose

Abstract

The invention relates to the technical field of axial flow fan equipment, in particular to a special-purpose axial flow fan which comprises a barrel, a driving motor is connected into the barrel, and fan blades are connected to an output shaft of the driving motor; a siphon gap is reserved between the siphon cylinder and the cylinder body, and an air inlet hole is formed in the cylinder body; the air collecting barrel is coaxially connected with the siphon barrel, the air collecting barrel is located on the side, away from the driving motor, of the siphon barrel, and the outer diameter of the air collecting barrel is smaller than that of the siphon barrel; the heat dissipation frame is connected with the barrel body, a plurality of air outlet holes are formed in one side of the heat dissipation frame, and an air inlet of the heat dissipation frame is right opposite to an opening in the end, away from the air collection barrel, of the siphon gap; the axial flow fan has the advantages that external normal-temperature gas is sucked in through the air inlet holes and guided to the position near the driving motor through the heat dissipation frame, so that cooling operation on the driving motor is completed, the temperature of the driving motor is kept within a reasonable range, and the possibility of equipment failures when the axial flow fan is applied to ventilation in a high-temperature environment is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of axial flow fan equipment, and in particular to an axial flow fan for special purposes. Background Art

[0002] Axial flow fan is a widely used fluid machinery. Its working principle is to rely on input mechanical energy to increase gas pressure and discharge gas. It is usually used for ventilation or enhanced heat dissipation. The axial flow fans widely used in the current market mainly include blades, hubs, motors and casings. Several core components realize effective air circulation and ventilation functions, greatly improving the production and living environment.

[0003] The prior art discloses an axial flow fan, which includes a shell, a fixing frame mounted on the shell, a driving motor mounted on the fixing frame, and a wind wheel mounted on the rotating shaft of the driving motor, wherein a rotating drum controlled by the driving motor is arranged in the shell, the rotating drum is located between the wind wheel and the shell, and the rotating drum extends from the air outlet of the shell to the air inlet; two connecting bearings are arranged between the outer wall of the rotating drum and the inner wall of the shell, and the two connecting bearings are respectively located at two ends of the rotating drum; the shell includes a straight cylinder part and an expanded cylinder part fixedly connected, the fixing frame is installed at the opening of the straight cylinder part, and the shape of the rotating drum is the same as that of the shell; the fixing frame includes a fixing ring connected to the shell and a connecting arm for mounting the driving motor, and the connecting arm is inclined toward the other end of the shell along the axis direction of the shell.

[0004] With regard to the above-mentioned related technologies, when axial flow fans are applied to some high-temperature working environments for ventilation operations, due to the high air temperature in the working environment and the heat generated by the drive motor of the axial flow fan itself when it is working, the temperature of the drive motor will be high, and the possibility of equipment failure is high during long-term use. Summary of the invention

[0005] In order to reduce the possibility of equipment failure when the axial flow fan is used for ventilation in a high-temperature environment, the present application provides an axial flow fan for a special purpose.

[0006] The present application provides a special-purpose axial flow fan adopts the following technical solution: A special-purpose axial flow fan, comprising: A cylinder with openings at both ends, wherein a drive motor is connected inside the cylinder, and a fan blade is coaxially connected to an output shaft of the drive motor; A siphon cylinder, wherein the siphon cylinder is coaxially connected to the cylinder body, a siphon gap is left between the siphon cylinder and the cylinder body, and the cylinder body is provided with a plurality of air inlet holes connected with the siphon gap; An air collecting cylinder, the air collecting cylinder is coaxially connected to the siphon cylinder, the air collecting cylinder is located on a side of the siphon cylinder away from the driving motor, and the outer diameter of the air collecting cylinder is smaller than the outer diameter of the siphon cylinder; A hollow heat sink is connected to the cylinder, a plurality of air outlets are provided on the side of the heat sink facing the drive motor, and an air inlet of the heat sink is directly opposite to an opening of a siphon gap away from one end of the air collecting cylinder.

[0007] By adopting the above technical solution, an external power supply provides electric energy for the driving motor, and the output shaft of the driving motor drives the fan blades to rotate. When the fan blades rotate, an air pressure difference occurs on both sides of the fan blades, and then the gas in the high-temperature environment is pumped to the outside through the cylinder and the pipeline. During the gas pumping process, the gas extracted from the high-temperature environment will transfer the temperature to the driving motor when flowing through the driving motor. The heat generated by the driving motor will cause the temperature of the driving motor to rise rapidly. At this time, part of the gas enters the siphon gap through the gap between the air collecting cylinder and the cylinder. Since the gap of the gas in the siphon gap is narrowed, the flow rate is accelerated, resulting in a decrease in the air pressure in the siphon gap. At this time, the outside air at normal temperature enters through the air inlet hole and passes through The air flows through the inner cavity of the heat sink to the drive motor to cool the drive motor, so that the temperature of the drive motor is kept within a reasonable range; the specially designed axial flow fan is convenient for installing the drive motor through the cylinder, and cooperates with the fan blades to form a space with a fixed air inlet diameter, and part of the gas can be introduced into the siphon gap through the air collecting tube, and with the cooperation of the siphon tube, the flow rate of the gas in the siphon gap is increased by reducing the gap, and then the external normal temperature gas is sucked in through the air inlet hole and guided to the vicinity of the drive motor through the heat sink, thereby completing the cooling operation of the drive motor, so that the temperature of the drive motor is kept within a reasonable range, reducing the possibility of equipment failure when the axial flow fan is used for ventilation in a high-temperature environment.

[0008] In a specific possible implementation scheme, the heat dissipation frame is rotatably connected to the cylinder, and a plurality of inclined driving plates are connected to the heat dissipation frame, and the inclined directions of the plurality of driving plates are consistent.

[0009] By adopting the above technical solution, a heat sink designed to be rotatably connected to the cylinder can be rotated through the cooperation of the driving plate, thereby achieving uniform heat absorption for the entire drive motor and avoiding local overtemperature on the drive motor.

[0010] In a specific possible implementation manner, the heat sink is arranged in an arc shape, and the axis of the heat sink is located on a side of the heat sink away from the driving motor.

[0011] By adopting the above technical solution, the heat sink is designed to be arc-shaped and the axis is located on the side of the heat sink away from the drive motor, which can facilitate the siphoned-in normal temperature air to smoothly enter the heat sink.

[0012] In a specific feasible implementation scheme, a rotating ring is coaxially rotatably connected to the cylinder body, and the rotating ring is sleeved on the cylinder body. The inner cavity of the rotating ring is connected to the siphon gap through the air inlet hole, and a fixing rod is connected between the rotating ring and the siphon cylinder. A blocking piece is connected to the cylinder body, and the blocking piece is connected to the air collecting cylinder. When the fixing rod passes through the air inlet hole and abuts against the cylinder body, the blocking piece blocks the opening of the air collecting cylinder at one end away from the siphon cylinder.

[0013] By adopting the above technical solution, the designed rotating ring and fixed rod can realize the rotation of the siphon tube, and then cooperate with the blocking piece to achieve the blocking of the air inlet of the air collecting tube.

[0014] In a specific embodiment, the blocking member comprises A blocking ring, the blocking ring is connected to the air collecting tube, and the blocking ring is provided with a plurality of air inlet notches; A plurality of arc-shaped windshield strips are connected to the cylinder, and when the fixing rod abuts against the cylinder, the arc-shaped windshield strips block the air inlet gaps opened on the blocking ring.

[0015] By adopting the above technical solution, the designed blocking piece can achieve the blocking and opening of the opening of the wind collecting tube away from the siphon tube through the cooperation of the blocking ring and a plurality of arc-shaped wind shielding strips.

[0016] In a specific embodiment, it further includes a driving unit, wherein the driving unit includes A hollow temperature sensing tube, the temperature sensing tube is connected to the cylinder and extends into the inner cavity of the cylinder, and the temperature sensing tube is located on one side of the driving motor; A sliding plug, wherein the sliding plug is slidably connected to the inner wall of the temperature sensing tube, and the sliding plug and the temperature sensing tube form a closed receiving cavity for storing the temperature sensing liquid; A conductive member is connected to the sliding plug, and the conductive member is connected to the rotating ring. The sliding plug slides along the axial direction of the temperature sensing tube and drives the rotating ring to rotate through the conductive member.

[0017] By adopting the above technical solution, a driving unit is designed, in which the temperature-sensitive liquid in the temperature-sensitive tube can be converted between liquid and gas according to the gas temperature near the driving motor in the cylinder. When the gas temperature near the driving motor is high, the temperature-sensitive liquid vaporizes and drives the sliding plug to slide. When the sliding plug slides, the power is converted and guided to the rotating ring through the conductive member, thereby driving the rotating ring to rotate, thereby realizing the opening of the air inlet on the side of the air collecting cylinder away from the siphon cylinder, and realizing the cooling operation of the driving motor.

[0018] In a specific embodiment, the conductive member includes A linear rack extending into the temperature sensing tube and connected to the sliding plug; An arc-shaped rack, wherein the arc-shaped rack is coaxially connected to the rotating ring; A transmission rod is rotatably connected to the cylinder, and both ends of the transmission rod are connected to transmission gears, one transmission gear is meshed with the linear rack, and the other transmission gear is meshed with the arc rack.

[0019] By adopting the above technical scheme, the temperature-sensitive liquid in the temperature-sensitive tube can be converted between liquid and gaseous states according to the gas temperature near the driving motor in the cylinder. When the gas temperature near the driving motor is high, the temperature-sensitive liquid vaporizes and drives the sliding plug to slide. The sliding plug drives the linear rack to move while sliding. The linear rack meshes with the transmission gear, and the rotation of the arc-shaped rack is realized through the transmission rod and another transmission gear. Finally, the arc-shaped rack drives the rotating ring to move, and the air inlet at the end of the air collecting tube away from the siphon tube is opened. The designed transmission member can realize the rotation of the rotating ring through the cooperation of the linear rack, the arc-shaped rack, the transmission rod and the transmission gear, thereby realizing the opening or closing of the air inlet at the end of the air collecting tube away from the siphon tube.

[0020] In a specific possible implementation mode, a plurality of water-absorbing sponges are embedded in the rotating ring.

[0021] By adopting the above technical solution, the designed water-absorbing sponge can increase the air humidity when the outside air enters the siphon gap, and then adhere to the drive motor and then evaporate again to absorb heat, thereby improving the cooling effect of the drive motor.

[0022] In summary, the present application includes at least one of the following beneficial technical effects: 1. The specially designed axial flow fan is convenient for installing the drive motor through the cylinder, and cooperates with the fan blades to form a space with a fixed air inlet diameter. Part of the gas can be introduced into the siphon gap through the air collecting cylinder, and with the cooperation of the siphon cylinder, the flow rate of the gas in the siphon gap is increased by reducing the gap, and then the external normal temperature gas is sucked in through the air inlet hole and guided to the vicinity of the drive motor through the heat sink, thereby completing the cooling operation of the drive motor, so that the temperature of the drive motor is maintained in a reasonable range, reducing the possibility of equipment failure when the axial flow fan is used for ventilation in a high temperature environment.

[0023] 2. The axial flow fan designed for special purpose can realize the rotation of the heat sink through the heat sink connected to the cylinder through the cooperation of the driving plate, thereby realizing uniform heat absorption of the whole driving motor and avoiding the situation of local over-temperature on the driving motor.

[0024] 3. The axial flow fan designed for special purposes can be converted between liquid and gaseous states according to the gas temperature near the driving motor in the cylinder through the temperature-sensitive liquid in the temperature-sensitive tube. When the gas temperature near the driving motor is high, the temperature-sensitive liquid vaporizes and pushes the sliding plug to slide. When the sliding plug slides, the power is converted and guided to the rotating ring through the conduction member, thereby driving the rotating ring to rotate, thereby opening the air inlet on the side of the wind collecting cylinder away from the siphon cylinder, and realizing the cooling operation of the driving motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the structure of an axial flow fan for special purposes according to an embodiment of the present application.

[0026] Figure 2 yes Figure 1 First perspective cross-sectional view.

[0027] Figure 3 yes Figure 1 A cross-sectional view from a second perspective.

[0028] Figure 4 is Figure 3 Cross-sectional view of the foundation after the rotating ring and fixed rod are added.

[0029] Figure 5 is Figure 4 Schematic diagram of the three-dimensional structure after adding blocking parts on the basis of.

[0030] Figure 6 is Figure 5 Schematic diagram of the three-dimensional structure after adding the drive unit on the basis of .

[0031] Figure 7 yes Figure 6 sectional view of .

[0032] Explanation of the reference numerals: 1. Cylinder body; 11. Driving motor; 12. Fan blades; 13. Air inlet; 2. Siphon cylinder; 21. Siphon gap; 3. Air collecting cylinder; 4. Heat dissipation frame; 41. Air outlet; 42. Driving plate; 5. Rotating ring; 51. Fixed rod; 6. Sealing member; 61. Sealing ring; 62. Arc-shaped wind shield strip; 7. Driving unit; 71. Temperature sensing tube; 72. Sliding plug; 73. Conducting member; 731. Linear rack; 732. Arc-shaped rack; 733. Transmission rod; 734. Transmission gear; 8. Water-absorbing sponge. DETAILED DESCRIPTION

[0033] The following is combined with Figure 1-7 This application is described in further detail.

[0034] The embodiment of the present application discloses an axial flow fan for special purposes.

[0035] Reference Figure 1 and Figure 2 A special-purpose axial flow fan includes a cylinder 1, a driving motor 11 and blades 12. The cylinder 1 is hollow and has openings at both ends. The driving motor 11 is located inside the cylinder 1, and the driving motor 11 is bolted to the cylinder 1. The output shaft of the driving motor 11 is keyed to the blades 12. In order to facilitate the assembly and disassembly of the driving motor 11, the driving motor 11 is opened at one end close to the cylinder 1, and the other end of the cylinder 1 away from the driving motor 11 can be connected to the ventilation duct, thereby completing the gas extraction in the target space.

[0036] Reference Figure 2 and Figure 3 When the axial flow fan is used to extract gas in a high-temperature environment, the heat of the high-temperature gas and the heat generated by the operation of the drive motor 11 itself will cause the drive motor 11 to be in a continuous high-temperature state, thereby increasing the failure rate. In order to reduce the temperature of the drive motor 11 when it is working, the special-purpose axial flow fan also includes a siphon tube 2, an air collection tube 3 and a heat sink 4. The siphon tube 2 is located in the cylinder body 1, and the siphon tube 2 is coaxially arranged with the cylinder body 1. A siphon gap 21 is left between the siphon tube 2 and the cylinder body 1, and a plurality of air inlet holes 13 connected to the siphon gap 21 are opened on the cylinder body 1. The air collection tube 3 is coaxially welded and fixed with the siphon tube 2, and the air collection tube 3 is located on the side of the siphon tube 2 away from the drive motor 11, and the outer diameter of the air collection tube 3 is smaller than the outer diameter of the siphon tube 2.

[0037] Reference Figure 2 and Figure 3The heat sink 4 is connected to the cylinder 1, and a plurality of air outlet holes 41 are provided on the side of the heat sink 4 facing the drive motor 11. The air inlet of the heat sink 4 is directly opposite to the opening of the siphon gap 21 away from the end of the air collecting cylinder 3. The drive motor 11 extracts gas in the high-temperature environment when it works, and part of the gas enters the gap between the air collecting cylinder 3 and the cylinder 1, and then enters the siphon gap 21. Since the gap of the siphon gap 21 is small, the gas flow rate is accelerated and the air pressure is reduced. The external normal temperature air enters the siphon gap 21 through the air inlet hole 13, and then enters the heat sink 4, and finally blows to the drive motor 11 through the air outlet hole 41, thereby completing the cooling of the drive motor 11.

[0038] Reference Figure 2 and Figure 3 Furthermore, the heat sink 4 is rotatably connected to the cylinder 1, and the rotation axis of the heat sink 4 coincides with the axis of the output shaft of the drive motor 11. A plurality of inclined drive sheets 42 are welded and fixed to the heat sink 4, and the inclination directions of the plurality of drive sheets 42 are consistent. When the drive motor 11 drives the fan blades 12 to rotate, the gas flows through the drive sheet 42 and applies force to the drive sheet 42, thereby driving the heat sink 4 to rotate; the heat sink 4 rotatably connected to the cylinder 1 can be rotated by cooperating with the drive sheet 42, thereby achieving uniform heat absorption of the entire drive motor 11, thereby avoiding the situation where the temperature of the drive motor 11 is too high locally.

[0039] Reference Figure 2 and Figure 3 Furthermore, the heat sink 4 is arranged in an arc shape, and the axis of the heat sink 4 is located on the side of the heat sink 4 away from the driving motor 11. The heat sink 4 is arranged in an arc shape and the axis is located on the side of the heat sink 4 away from the driving motor 11, so that the normal temperature air siphoned in can smoothly enter the heat sink 4.

[0040] Reference Figure 4 A rotating ring 5 is rotatably connected to the cylinder 1, and the rotating ring 5 is coaxially sleeved on the cylinder 1, and the inner cavity of the rotating ring 5 is connected with the siphon gap 21 through the air inlet hole 13. A plurality of through holes are opened on the rotating ring 5 to facilitate external normal temperature air to enter the inner cavity of the rotating ring 5. The air inlet hole 13 is arranged in a strip shape, and the air inlet hole 13 is coaxially arranged with the cylinder 1. The rotating ring 5 is connected to the siphon cylinder 2 by a fixing rod 51, and the fixing rod 51 is arranged through the air inlet hole 13.

[0041] Reference Figure 5 At this time, applying force to the rotating ring 5 can drive the siphon tube 2 to rotate through the fixed rod 51. In order to facilitate the blocking of the air inlet of the wind collecting tube 3 away from the end of the siphon tube 2 while the siphon tube 2 rotates, a blocking member 6 is also connected to the cylinder body 1. The blocking member 6 is connected to the siphon tube 2, and when the fixing member abuts against the end of the air inlet hole 13, that is, the cylinder body 1, the blocking member 6 blocks the opening of the air collecting tube 3 away from the end of the siphon tube 2.

[0042] Reference Figure 5 Specifically, the blocking member 6 includes a blocking ring 61 and a plurality of arc-shaped wind shielding strips 62. The blocking ring 61 is welded and fixed to the air collecting cylinder 3, and a plurality of air inlet notches are provided on the blocking ring 61. The inner cavity of the cylinder 1 is connected with the gap between the air collecting cylinder 3 and the cylinder 1 through the air inlet notches. The arc-shaped wind shielding strip 62 is welded and fixed to the cylinder 1, and the arc-shaped wind shielding strip 62 is coaxially arranged with the air collecting cylinder 3. When the fixing rod 51 abuts against the cylinder 1, the arc-shaped wind shielding strip 62 blocks the air inlet notches provided on the blocking ring 61.

[0043] Reference Figure 6 and Figure 7 In order to facilitate the linkage between the overall temperature of the driving motor 11 and the opening of the cooling function, a driving unit 7 is also included. The driving unit 7 includes a temperature sensing tube 71, a sliding plug 72 and a conductive member 73. The temperature sensing tube 71 is hollow and is welded and fixed to the cylinder 1. The temperature sensing tube 71 extends into the inner cavity of the cylinder 1 and is arranged close to the driving motor 11. The sliding plug 72 is slidably connected to the temperature sensing tube 71, and a closed accommodating cavity is formed between the sliding plug 72 and the temperature sensing tube 71 for storing temperature sensing liquids with low boiling points such as alcohol, methanol, etc.

[0044] Reference Figure 6 and Figure 7 The transmission member 73 is connected to the sliding plug 72, and the transmission member 73 is connected to the rotating ring 5. When the sliding plug 72 slides along the axial direction of the temperature sensing tube 71, the rotating ring 5 is driven to rotate through the transmission member 73. Specifically, the transmission member 73 includes a linear rack 731, an arcuate rack 732, a transmission rod 733 and two transmission gears 734. The linear rack 731 is welded and fixed to the sliding plug 72, and the linear rack 731 is staggered with the temperature sensing tube 71. The arcuate rack 732 is coaxially connected to the rotating ring 5. The transmission rod 733 is rotationally connected to the cylinder 1. The two transmission gears 734 are coaxially clamped at the opposite ends of the transmission rod 733, respectively, and one transmission gear 734 is meshed with the linear rack 731, and the other transmission gear 734 is meshed with the arcuate rack 732.

[0045] Reference Figure 7 In order to further improve the cooling effect of the drive motor 11, a plurality of water-absorbing sponges 8 are embedded in the rotating ring 5, and some water can be input into the water-absorbing sponges 8 during cooling; through the water-absorbing sponges 8, the air humidity can be increased when the outside air enters the siphon gap 21, and then adheres to the drive motor 11 and then evaporates again to absorb heat, thereby improving the cooling effect of the drive motor 11.

[0046] The implementation principle of a special-purpose axial flow fan in the embodiment of the present application is as follows: an external power supply provides electric energy for the driving motor 11 to work, and the output shaft of the driving motor 11 drives the fan blades 12 to rotate. When the fan blades 12 rotate, an air pressure difference occurs in the air on both sides of the fan blades 12, and then the gas in the high-temperature environment is pumped to the outside through the cylinder 1 and the pipeline. During the gas pumping process, the gas extracted from the high-temperature environment will transfer the temperature to the driving motor 11 when it flows through the driving motor 11. The heat generated by the driving motor 11 will cause the temperature of the driving motor 11 to rise rapidly. At this time, the temperature-sensitive liquid in the temperature-sensitive tube 71 can be converted between liquid and gas according to the gas temperature near the driving motor 11 in the cylinder 1. When the gas temperature near the driving motor 11 is high, the temperature-sensitive liquid vaporizes and pushes the sliding plug 72 to slide. When the sliding plug 72 slides, the power conversion is guided to the rotating ring 5 through the conductive member 73, and then the rotating ring 5 is driven to rotate, so as to realize the opening of the air inlet on the side of the air collecting tube 3 away from the siphon tube 2. At this time, part of the gas passes through the temperature sensing tube 71. The gas enters the siphon gap 21 through the gap between the air collecting cylinder 3 and the cylinder body 1. Since the gap of the gas in the siphon gap 21 is narrowed, the flow rate is accelerated, resulting in a decrease in the air pressure in the siphon gap 21. At this time, the ambient air enters through the air inlet hole 13, and flows through the inner cavity of the heat sink 4 to the drive motor 11 to cool the drive motor 11, so that the temperature of the drive motor 11 is maintained within a reasonable range; the cylinder body 1 is convenient for installing the drive motor 11, and cooperates with the fan blades 12 to form a space with a fixed air inlet diameter, part of the gas can be introduced into the siphon gap 21 through the air collecting cylinder 3, and with the cooperation of the siphon cylinder 2, the flow rate of the gas in the siphon gap 21 is increased by reducing the gap, and then the ambient air is sucked in through the air inlet hole 13 and guided to the vicinity of the drive motor 11 through the heat sink 4, thereby completing the cooling operation of the drive motor 11, so that the temperature of the drive motor 11 is maintained within a reasonable range, reducing the possibility of equipment failure when the axial flow fan is used for ventilation in a high-temperature environment.

[0047] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A special-purpose axial flow fan, characterized in that: include: A cylinder (1) with openings at both ends, a drive motor (11) connected inside the cylinder (1), and a fan blade (12) coaxially connected to an output shaft of the drive motor (11); A siphon tube (2), wherein the siphon tube (2) is coaxially connected to the cylinder (1), a siphon gap (21) is left between the siphon tube (2) and the cylinder (1), and the cylinder (1) is provided with a plurality of air inlet holes (13) connected to the siphon gap (21); An air collecting cylinder (3), the air collecting cylinder (3) being coaxially connected to the siphon cylinder (2), the air collecting cylinder (3) being located on a side of the siphon cylinder (2) away from the driving motor (11), and the outer diameter of the air collecting cylinder (3) being smaller than the outer diameter of the siphon cylinder (2); A heat sink (4) is arranged in a hollow shape, the heat sink (4) is connected to the cylinder (1), a plurality of air outlet holes (41) are provided on the side of the heat sink (4) facing the drive motor (11), and an air inlet of the heat sink (4) is arranged opposite to an opening of a siphon gap (21) away from one end of the air collecting cylinder (3).

2. The special-purpose axial flow fan according to claim 1, characterized in that: The heat dissipation frame (4) is rotatably connected to the cylinder (1), and a plurality of inclined drive plates (42) are connected to the heat dissipation frame (4), and the inclination directions of the plurality of drive plates (42) are consistent.

3. The special-purpose axial flow fan according to claim 2, characterized in that: The heat dissipation frame (4) is arranged in an arc shape, and the axis of the heat dissipation frame (4) is located on a side of the heat dissipation frame (4) away from the drive motor (11).

4. The special-purpose axial flow fan according to any one of claims 1 to 3, characterized in that: A rotating ring (5) is coaxially rotatably connected to the cylinder (1), and the rotating ring (5) is sleeved on the cylinder (1). The inner cavity of the rotating ring (5) is connected to the siphon gap (21) through the air inlet hole (13), and a fixing rod (51) is connected between the rotating ring (5) and the siphon cylinder (2). A blocking member (6) is connected to the cylinder (1), and the blocking member (6) is connected to the air collecting cylinder (3). When the fixing rod (51) passes through the air inlet hole (13) and abuts against the cylinder (1), the blocking member (6) blocks the opening of the air collecting cylinder (3) at one end away from the siphon cylinder (2).

5. The special-purpose axial flow fan according to claim 4, characterized in that: The blocking member (6) comprises A blocking ring (61), the blocking ring (61) is connected to the air collecting cylinder (3), and a plurality of air inlet notches are formed on the blocking ring (61); A plurality of arc-shaped wind shielding strips (62), wherein the arc-shaped wind shielding strips (62) are connected to the cylinder (1), and when the fixing rod (51) is in contact with the cylinder (1), the arc-shaped wind shielding strips (62) block the air inlet openings provided on the blocking ring (61).

6. The special-purpose axial flow fan according to claim 5, characterized in that: It also includes a driving unit (7), wherein the driving unit (7) includes a hollow temperature sensing tube (71), the temperature sensing tube (71) being connected to the cylinder (1) and extending into the inner cavity of the cylinder (1), and the temperature sensing tube (71) being located on one side of the driving motor (11); A sliding plug (72), wherein the sliding plug (72) is slidably connected to the inner wall of the temperature sensing tube (71), and the sliding plug (72) and the temperature sensing tube (71) form a closed receiving cavity for storing temperature sensing liquid; A conductive member (73), wherein the conductive member (73) is connected to the sliding plug (72), and the conductive member (73) is connected to the rotating ring (5), and the sliding plug (72) slides axially along the temperature sensing tube (71) and drives the rotating ring (5) to rotate through the conductive member (73).

7. The special-purpose axial flow fan according to claim 6, characterized in that: The conductive member (73) comprises A linear rack (731), the rack extending into the temperature sensing tube (71) and connected to the sliding plug (72); An arc-shaped rack (732), wherein the arc-shaped rack (732) is coaxially connected to the rotating ring (5); A transmission rod (733), the transmission rod (733) is rotatably connected to the cylinder (1), and both ends of the transmission rod (733) are connected to transmission gears (734), one of the transmission gears (734) is meshed with the linear rack (731), and the other transmission gear (734) is meshed with the arc rack (732).

8. The special-purpose axial flow fan according to claim 4, characterized in that: A plurality of water-absorbing sponges (8) are embedded in the rotating ring (5).

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