Axial-flow type cooling fan

Abstract

The utility model discloses an axial flow type cooling fan which comprises a guide cylinder, a fan arranged in the guide cylinder and a motor fixedly connected to one end of the guide cylinder and used for driving the fan to rotate, the fan comprises a hub in transmission connection with the motor and a plurality of blades evenly distributed on the periphery of the hub, and an adjusting device is arranged in the hub; when the fan is in a running state, the adjusting device adjusts the blades to running angles, when the fan is in a stopping state, the adjusting device adjusts the blades to angles perpendicular to the axis of the guide cylinder, and all the blades are located on the same plane. When the fan is in a stop state, the blades are adjusted to the angle perpendicular to the axis of the guide cylinder through the adjusting device, when the fan is in the stop state, all the blades are located on the same plane, the blades are closed at the moment, the right end of the guide cylinder is blocked, and only a small gap is reserved around the guide cylinder. Therefore, most of external dust and floating objects can be prevented from entering the equipment through the blades and the guide cylinder, and dust accumulation in the equipment is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of fans, in particular to an axial flow heat dissipation fan. Background Art

[0002] Axial-flow cooling fans are a common cooling device used for ventilation and heat dissipation in various equipment. For example, electrical control cabinets generate significant heat during operation. Axial-flow cooling fans are often installed to blow low-temperature external air into the cabinet, ventilating the interior and preventing overheating that could reduce the lifespan of electrical components or cause malfunctions.

[0003] When the equipment stops running, the axial flow cooling fan will also stop running. At this time, the inside and outside of the equipment will be connected through the axial flow fan. Therefore, dust and floating objects in the surrounding environment will continue to enter the interior of the equipment through the axial flow fan, causing dust to continue to accumulate inside the equipment, thereby shortening the service life of the equipment or the maintenance cycle of the equipment.

[0004] Patent Publication No. CN214465142U discloses an automatically closing shutter for an axial flow fan. This system employs a shutter installed next to the fan. When the fan stops, the shutter closes, and when the fan is running, the shutter opens. However, the shutter creates resistance to the flowing air, thereby reducing ventilation volume, increasing the fan's power consumption, and reducing its efficiency. Patent Publication No. CN221503612U discloses a shutter structure for a wall-mounted axial flow fan. Because the shutter is also installed next to the fan, it also suffers from the aforementioned technical problems. Utility Model Content

[0005] The purpose of the utility model is to provide an axial flow cooling fan, which separates the inside and outside of the equipment after the equipment stops running, reduces the entry of external dust and floating objects into the interior of the equipment through the axial flow cooling fan, thereby extending the service life or maintenance cycle of the equipment, and at the same time will not affect the fan air volume.

[0006] In order to achieve the above purpose, the technical solution adopted by the present utility model is:

[0007] An axial flow heat dissipation fan includes a guide tube, a fan arranged in the guide tube, and a motor fixedly connected to one end of the guide tube for driving the fan to rotate. The fan includes a hub connected to the motor and a plurality of blades evenly distributed around the hub. The blades are all rotatably connected to the hub. An adjustment device for changing the angle of the blades is provided in the hub. When the fan is in operation, the adjustment device adjusts the blades to the operating angle. When the fan is in a stopped state, the adjustment device adjusts the blades to an angle perpendicular to the axis of the guide tube. When the fan is in a stopped state, the blades are located in the same plane.

[0008] Furthermore, the hub includes a cylinder, which is coaxial with the motor. A first bevel gear is rotatably connected to each blade position in the cylinder, and the first bevel gears are fixedly connected to the inner ends of the corresponding blades. A second bevel gear is rotatably connected to the cylinder, and the first bevel gears are meshed with the second bevel gears. The motor is connected to the first bevel gear.

[0009] Furthermore, the cylinder is rotatably connected to a connecting sleeve at one end close to the motor, the shafts of the connecting sleeve and the motor are coaxial with the second bevel gear, one end of the connecting sleeve is fixedly connected to the shaft of the motor, and the other end of the connecting sleeve is transmission connected to the second bevel gear; a fixing plate is fixedly connected to the cylinder, and the fixing plate is located between the second bevel gear and the connecting sleeve, and the fixing plate is provided with an arc-shaped slide groove at one end close to the second bevel gear, the axis of the slide groove coincides with the axis of the second bevel gear, and a cylindrical pin that can move in the slide groove is fixedly connected to the second bevel gear, and when the cylindrical pin moves to one end of the slide groove, the blade is at the operating angle, and when the cylindrical pin moves to the other end of the slide groove, the blade is perpendicular to the axis of the guide cylinder.

[0010] Furthermore, a torsion spring for applying torque to the second bevel gear is provided in the cylinder, one end of the torsion spring is connected to the cylinder, and the other end is connected to the second bevel gear. When the motor is working, the motor drives the second bevel gear to rotate through the connecting sleeve, and after overcoming the torsion force of the torsion spring, it drives the first bevel gear to rotate, so that the blade is at the operating angle. When the motor stops running, under the elastic force of the torsion spring, the second bevel gear drives the first bevel gear to rotate, so that the blade is perpendicular to the axis of the guide cylinder.

[0011] Furthermore, an adjusting screw is screwed into the sliding groove of the fixing plate, and when the fan is running, the cylindrical pin abuts against the adjusting screw.

[0012] Furthermore, guide vanes are provided in the guide tube, and outer ends of the guide vanes are fixedly connected to the guide tube.

[0013] Furthermore, the guide vanes are curved into an arc shape, the bending directions of the guide vanes are consistent, and the concave surfaces of the guide vanes face the direction of the wind blown out by the fan.

[0014] Furthermore, an inner cylinder is coaxially arranged inside the guide cylinder, the guide vanes are arranged between the inner cylinder and the guide cylinder, and the inner ends of the guide vanes are fixedly connected to the inner cylinder.

[0015] The positive effects of this utility model are:

[0016] The fan of the utility model includes a motor hub and blades evenly distributed around the hub. The blades are rotatably connected to the hub, and an adjustment device for changing the angle of the blades is provided in the hub. The adjustment device includes a first bevel gear, a second bevel gear, a connecting sleeve, a fixing plate, and a torsion spring. The blades can be opened and closed by the adjustment device without the need for other devices. When the motor is working, each blade can automatically open and reach the operating angle. After the motor stops running, each blade can automatically close to achieve the closure of the guide tube, preventing external dust and debris from passing through the blades and entering the interior of the device, thereby reducing the accumulation of dust and debris inside the device and extending the service life or maintenance cycle of the device. Since there is no structure to block the wind next to the fan, it will not affect the air volume and operating efficiency of the axial flow fan. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a three-dimensional diagram of the utility model;

[0018] Figure 2 It is a side view of the utility model;

[0019] Figure 3 This is a schematic diagram of the fan and motor;

[0020] Figure 4 It is a schematic diagram of the structure of the wheel hub;

[0021] Figure 5 yes Figure 4 Cross-sectional view of the middle AA part;

[0022] Figure 6 This is a state diagram of each blade when the utility model stops running;

[0023] In the picture:

[0024] 1. Guide tube; 2. Protective net; 3. Motor; 4. Hub; 5. Blades; 6. End caps; 7. Turntable; 8. First bevel gear; 9. Cylinder; 10. End cover; 11. Connecting sleeve; 12. Slide groove; 13. Cylindrical pin; 14. Second bevel gear; 15. Torsion spring; 16. Rotating shaft; 17. Guide vane; 18. Adjustment screw; 19. Inner tube. DETAILED DESCRIPTION

[0025] Example 1

[0026] like Figure 1 and 2As shown in the figure, a common axial flow fan currently consists of a cylindrical guide tube 1, a fan mounted inside the tube, a protective screen 2 fixedly connected to the right end of the tube 1, and a motor 3 fixedly mounted in the center of the protective screen 2 and connected to the fan. The left end of the guide tube 1 is mounted on the ventilation hole of the equipment. The motor 3 drives the fan, blowing cooler air from outside into the equipment, achieving ventilation and heat dissipation.

[0027] This embodiment is improved on the basis of the existing axial flow fan. Figure 3 、 Figure 4 and Figure 6 As shown, the fan includes a hub 4 that is transmission-connected to a motor 3 and six fan-shaped blades 5 evenly distributed around the hub 4. The blades 5 are all rotationally connected to the hub 4, and an adjustment device for changing the angle of the blades 5 is provided within the hub 4. The fan has two states: running and stopped. When the fan is running, the adjustment device adjusts the blades 5 to the running angle, at which point the fan takes on a propeller-like shape and, driven by the motor, blows air into the air guide tube 1. When the fan is stopped, the adjustment device adjusts the blades 5 to an angle perpendicular to the axis of the air guide tube 1. When the fan is stopped, the blades 5 are located in the same plane. At this point, the blades 5 are closed, thereby blocking the right end of the air guide tube 1, leaving only a small gap around it. This prevents most external dust and floating objects from entering the device through the blades 5 and the air guide tube 1, thereby reducing dust accumulation within the device.

[0028] Example 2

[0029] like Figure 4 and Figure 5 As shown, the hub 4 includes an end cap 6, a cylinder 9 and an end cover 10, which are fixedly connected by screws from left to right. The end cap 6 is in the shape of a truncated cone, and the end plate 10 is in the shape of a disc. The cylinder 9 is cylindrical and coaxial with the shaft of the motor 3. The inner end of each blade 5 is fixedly connected to a disc-shaped turntable 7. The outer wall of the cylinder 9 is milled with pits at the position corresponding to each turntable 7, and the bottom of the pits is flat. A first bevel gear 8 is rotatably connected to the position of each turntable 7 in the cylinder 9. The shaft fixed to the center of the first bevel gear 8 is respectively connected to the cylinder 9 through rotation and is fixedly connected to the corresponding turntable 7. A second bevel gear 14 is provided in the cylinder 9. The second bevel gear 14 is coaxial with the shaft of the motor 3. A rotating shaft 16 is fixedly connected to the center of the second bevel gear 14. The first bevel gear 8 is meshed with the second bevel gear 14.

[0030] The right end of the cylinder 9 is rotatably connected to a connecting sleeve 11, which is in clearance fit with the end cover 10. The connecting sleeve 11 is sealed with the end disc 10 via a sealing ring disposed in the inner hole of the end disc 10. The connecting sleeve 11 and the shaft of the motor 3 are both coaxial with the second bevel gear 14.

[0031] The left end of the rotating shaft 16 is rotatably connected to the end cap 6, and the right end of the rotating shaft 16 is keyed to the connecting sleeve 11. The right end of the connecting sleeve 11 is fixedly connected to the shaft of the motor 3 via a set screw. A circular fixed disk 20 is provided between the second bevel gear 14 and the connecting sleeve 11, which is sleeved around the rotating shaft 16. The rotating shaft 16 and the fixed disk 20 have a clearance fit. The left end surface of the fixed disk 20 is provided with an arc-shaped chute 12, the axis of which coincides with the axis of the second bevel gear 14. A cylindrical pin 12 is fixedly connected to the second bevel gear 14, with the right end of the cylindrical pin 12 inserted into the chute 12. When the second bevel gear 14 rotates, the cylindrical pin 12 moves within the chute 12.

[0032] When motor 3 starts, its shaft rotates connecting sleeve 11, which in turn rotates second bevel gear 14 via shaft 16. Inertia causes relative rotation between second bevel gear 14 and cylinder 9, moving cylindrical pin 13 along slot 12 toward one end. This causes second bevel gear 14 to rotate first bevel gear 8, causing the angle of blade 5 to change. When cylindrical pin 13 reaches the end of slot 12, blade 5 reaches its operating angle.

[0033] A torsion spring 15 for applying torque to the second bevel gear 14 is further provided in the connecting sleeve 11 . The left end of the torsion spring 15 is inserted into the blind hole on the left side of the end cap 6 , and the right end is inserted into the corresponding blind hole on the second bevel gear 14 .

[0034] When the motor 3 is started, due to inertia, the connecting sleeve 11 and the cylinder 9 rotate relative to each other. The motor 3 drives the second bevel gear 14 to rotate through the connecting sleeve 11. After overcoming the torsion force of the torsion spring 15, it drives the first bevel gear 8 to rotate, so that the blades 5 are at the operating angle. At the same time, the torque of the air resistance acting on the cylinder 9 during the rotation of the blades 5 is greater than the torque acting on the cylinder 9 by the torsion spring 19, thereby maintaining the operating angle of the blades 5. When the motor 3 stops running, the air resistance will gradually decrease as the speed of the blades 5 decreases. When the torque of the air resistance acting on the cylinder 9 is less than the torque acting on the cylinder 9 by the torsion spring 19, the second bevel gear 14 drives the first bevel gear 8 to rotate under the elastic force of the torsion spring 15, so that the blades 5 return to a state perpendicular to the axis of the guide tube 1, and the blades 5 are closed.

[0035] In this embodiment, no other device is required to open and close the blades 5. When the motor 3 is working, the blades 5 can automatically open and reach the operating angle. After the motor 3 stops running, the blades 5 can automatically close to close the guide tube 1.

[0036] The fixing plate 20 is screwed with an adjusting screw 18 in the chute 12. When the fan is running, the cylindrical pin 13 abuts against the adjusting screw 18. By changing the position of the adjusting screw 18 in the chute 12, the running angle of the blade 5 can be adjusted when the fan is running, thereby adjusting the air volume.

[0037] Example 3

[0038] like Figure 1 As shown, the difference between this embodiment and embodiment 2 is that:

[0039] An inner cylinder 19 is provided within the guide cylinder 1. Curved guide vanes 17, formed from bent steel plates, are positioned between the inner cylinder 19 and the guide cylinder 1. The ends of the guide vanes 17 are fixedly connected to the guide cylinder 1 and the inner cylinder 19, respectively. The guide vanes 17 are curved in the same direction, with their concave surfaces facing the direction of the spiral wind blown by the fan. The cylinder 9 is located within the inner cylinder 19 and has a clearance fit therewith.

[0040] After the airflow passes through the blades 5 and performs work, it simultaneously moves axially around the axis, forming a spiral. The moment the spiral airflow hits the guide vanes 17, the wind direction changes, converging the rotating air's kinetic energy toward the inner cylinder 19. This increases the wind speed in the center of the guide cylinder 1, making the axial wind speed produced by the present invention more uniform.

[0041] The above-mentioned embodiments are described in a relatively detailed and specific manner, expressing preferred embodiments of the present invention. They are only used to illustrate the technical ideas and features of the present invention. Their purpose is to enable those skilled in the art to understand the contents of the present invention and implement them accordingly. However, they are not limited to the present invention alone, and the patent scope of the present invention cannot be limited solely by these embodiments. That is, any equivalent changes or modifications made to the spirit disclosed by the present invention, for researchers or technicians in this field, without departing from the structure of the present invention, local improvements within the system and changes and conversions between subsystems, etc., are still within the patent scope of the present invention.

Claims

1. An axial flow heat dissipation fan, comprising a guide tube (1), a fan arranged in the guide tube (1), and a motor (3) fixedly connected to one end of the guide tube (1) for driving the fan to rotate, characterized in that: The fan comprises a hub (4) connected to the motor (3) in a transmission manner and a plurality of blades (5) uniformly distributed around the hub (4), wherein the blades (5) are all rotatably connected to the hub (4), and an adjustment device for changing the angle of the blades (5) is provided in the hub (4); when the fan is in operation, the adjustment device adjusts the blades (5) to an operating angle, and when the fan is in a stopped state, the adjustment device adjusts the blades (5) to an angle perpendicular to the axis of the guide tube (1), and when the fan is in a stopped state, the blades (5) are located in the same plane.

2. The axial flow cooling fan according to claim 1, characterized in that: The hub (4) includes a cylinder (9), the cylinder (9) is coaxial with the motor (3), and a first bevel gear (8) is rotatably connected to each blade (5) in the cylinder (9), and the first bevel gear (8) is fixedly connected to the inner end of the corresponding blade (5). A second bevel gear (14) is rotatably connected to the cylinder (9), and the first bevel gear (8) is meshed with the second bevel gear (14). The motor (3) is connected to the first bevel gear (8).

3. The axial flow cooling fan according to claim 2, characterized in that: The cylinder (9) is rotatably connected to a connecting sleeve (11) at one end close to the motor (3); the shafts of the connecting sleeve (11) and the motor (3) are coaxial with the second bevel gear (14); one end of the connecting sleeve (11) is fixedly connected to the shaft of the motor (3); the other end of the connecting sleeve (11) is transmission-connected to the second bevel gear (14); a fixing plate (20) is fixedly connected inside the cylinder (9); the fixing plate (20) is located between the second bevel gear (14) and the connecting sleeve (11); the fixing plate ( 20) An arc-shaped chute (12) is provided at one end close to the second bevel gear (14), the axis of the chute (12) coincides with the axis of the second bevel gear (14), and a cylindrical pin (13) is fixedly connected to the second bevel gear (14) and can move in the chute (12). When the cylindrical pin (13) moves to one end of the chute (12), the blade (5) is located at the operating angle, and when the cylindrical pin (13) moves to the other end of the chute (12), the blade (5) is perpendicular to the axis of the guide tube (1).

4. The axial flow cooling fan according to claim 3, characterized in that: A torsion spring (15) for applying torque to the second bevel gear (14) is further provided in the cylinder (9). One end of the torsion spring (15) is connected to the cylinder (9), and the other end is connected to the second bevel gear (14). When the motor (3) is working, the motor (3) drives the second bevel gear (14) to rotate through the connecting sleeve (11). After overcoming the torsion force of the torsion spring (15), the motor drives the first bevel gear (8) to rotate, so that the blade (5) is at an operating angle. When the motor (3) stops running, under the elastic force of the torsion spring (15), the second bevel gear (14) drives the first bevel gear (8) to rotate, so that the blade (5) is perpendicular to the axis of the guide cylinder (1).

5. The axial flow heat dissipation fan according to claim 3, characterized in that: The fixing plate (20) is provided with an adjusting screw (18) screwed into the sliding groove (12). When the fan is running, the cylindrical pin (13) abuts against the adjusting screw (18).

6. The axial flow cooling fan according to claim 1, characterized in that: Guide vanes (17) are provided in the guide cylinder (1), and outer ends of the guide vanes (17) are fixedly connected to the guide cylinder (1).

7. The axial flow cooling fan according to claim 6, characterized in that: The guide blades (17) are curved into an arc shape, the bending directions of the guide blades (17) are consistent, and the concave surfaces of the guide blades (17) face the direction of the wind blown out by the fan.

8. The axial flow cooling fan according to claim 6, characterized in that: An inner cylinder (19) is coaxially arranged inside the guide cylinder (1), the guide vanes (17) are arranged between the inner cylinder (19) and the guide cylinder (1), and the inner ends of the guide vanes (17) are fixedly connected to the inner cylinder (19).

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