Variable-speed low-noise axial flow fan

Abstract

The invention discloses a variable-speed low-noise axial flow fan, and belongs to the technical field of axial flow fans. A variable-speed low-noise axial flow fan comprises a supporting frame, a fan shell and a fan body. The draught fan body is detachably connected with the inner wall of the draught fan shell, and the supporting frames are located on the two sides of the draught fan shell, detachably connected with the two sides of the draught fan shell and used for supporting the draught fan shell. The fan body comprises a fan blade assembly, a speed change assembly and a motor, and the motor is detachably connected with the fan blade assembly through the speed change assembly and used for driving the fan blade assembly to rotate; the fan shell comprises an outer shell and an inner shell, the front end of the outer shell is fixedly connected with the inner shell, the tail end of the outer shell is detachably connected with the inner shell, and a sealing cavity is formed between the inner wall of the outer shell and the outer wall of the inner shell and used for reducing noise in the axial flow fan.

Description

Technical Field

[0001] The present invention belongs to the technical field of axial flow fans, and more specifically, relates to a variable speed and low noise axial flow fan. Background Art

[0002] Axial flow fans are a common type of fans, also known as local ventilation fans, and are widely used in industrial and mining enterprises, agricultural production, construction sites, aerospace and other fields. It is the airflow in the same direction as the axis of the fan blades, such as electric fans and air conditioner outdoor fans, which are axial flow fans. They are called "axial flow" because the gas flows parallel to the fan axis. Axial flow fans are usually used in situations where the flow requirements are high and the pressure requirements are low. Axial flow fans are fixed in position and move the air.

[0003] During operation, the existing axial flow fan may generate loud noise due to the friction between the blades and the airflow and the vibration of the motor, which affects the normal operation of the fan. At the same time, after long-term operation, dust will accumulate inside the axial flow fan. The adhesion of dust on the surface of the axial flow fan component will cause unbalanced operation of the component, which may cause unstable driving of the motor on the blades, thereby shortening the service life of the fan. Taking an axial flow fan with noise reduction function disclosed in a Chinese invention patent document (CN202210548985.6) as an example, the invention arranges an airflow stabilizing mechanism in the shell to prevent the fan blades from being impacted by turbulent airflow and generating excessive noise, and a cleaning mechanism is provided in the middle of the shell to clean the dust accumulated on the fan blades. However, the invention only reduces the noise generated by the friction between the blades and the airflow, and cannot solve the noise generated by the vibration of the motor. At the same time, the cleaning mechanism can only clean the fan blades locally, and the cleaning effect is not good. The efficiency of the axial flow fan will still be reduced due to the dust after long-term operation.

[0004] Therefore, we need an axial flow fan with long service life and good noise reduction effect. Summary of the invention

[0005] The object of the present invention is to provide a variable speed and low noise axial flow fan, which can achieve better noise reduction effect by reducing the vibration of the entire axial flow fan, and at the same time can remove dust from the inside of the fan in real time, thereby improving the stability and service life of the axial flow fan.

[0006] To achieve the above object, the present invention provides the following technical solutions: A variable speed, low noise axial flow fan of the present invention comprises a support frame, a fan casing and a fan body; the fan body is detachably connected to the inner wall of the fan casing, and the support frame is located on both sides of the fan casing and is detachably connected to both sides of the fan casing for supporting the fan casing.

[0007] The fan body includes a fan blade assembly, a speed change assembly and a motor. The motor is detachably mounted inside the fan housing. The motor is detachably connected to the fan blade assembly via the speed change assembly to drive the fan blade assembly to rotate.

[0008] The fan housing includes an outer shell and an inner shell. The front end of the outer shell is fixedly connected to the inner shell, and the rear end of the outer shell is detachably connected to the inner shell, so as to form a sealed cavity between the inner wall of the outer shell and the outer wall of the inner shell, so as to reduce the noise inside the axial flow fan.

[0009] As a further improvement of the present invention, a support seat is provided on the top of the fan housing, and a vacuum pump is detachably installed on the upper part of the support seat. The air inlet pipe of the vacuum pump is connected to the interior of the sealed cavity, so as to draw a vacuum inside the sealed cavity and achieve the effect of reducing noise inside the fan housing; the exhaust pipe position extends along the fan inner shell to the position of the fan blade assembly, and can remove dust from the surface of the fan blade assembly in a direction perpendicular to the air inlet direction, so as to prevent dust from adhering to the sides and back of the fan blade assembly and affecting the rotation stability of the fan blade assembly.

[0010] As a further improvement of the present invention, the support frame includes a frame body, a plurality of moving wheels and a plurality of braking devices. The moving wheels can be detachably installed at the bottom of the frame body for adjusting the position of the fan; the braking devices can be detachably installed at the sides of the plurality of moving wheels for fixing the moving wheels to keep the fan stationary when working.

[0011] As a further improvement of the present invention, the braking device includes a pair of connecting plates, a brake plate and a torsion spring, one end of the pair of connecting plates is detachably connected to both sides of the moving wheel, and the brake plate is hinged to the other end of the connecting plate; the torsion spring is detachably installed on one side of the connecting plate, the torsion spring contacts the brake plate, and is used to reset the brake plate after the brake plate brakes the moving wheel.

[0012] As a further improvement of the present invention, the side of the brake plate close to the moving wheel is an elliptical wheel part, and the side away from the moving wheel is a pedal; the elliptical wheel part resists the torsion spring, which is used to reset after the pedal is compressed and causes the elliptical wheel part to rotate; a pad is detachably installed at the lower part of the pedal, and the pad and the pedal can be elastically connected by a spring, which is used to slow down the transmission of vibration of the fan body to the support frame.

[0013] As a further improvement of the present invention, the speed change assembly includes a driving shaft, gear one, gear two, a driven shaft, a sleeve, gear three and gear four, the driving shaft is connected to the output end of the motor, and gear one and gear two are respectively matched with the driving shaft key pin; one end of the driven shaft is detachably connected to the fan blade assembly, a pull arm is fixedly installed on the inner shell, and the other end of the driven shaft is rotatably connected to the pull arm; the sleeve is slidably connected to the driven shaft, and gear three and gear four are respectively matched with the sleeve key pin; gear one matches gear three, and gear two matches gear four, and the distance between gear one and gear two is greater than the distance between gear three and gear four, which is used to slide the sleeve to switch the rotation speed of the fan blade assembly, thereby realizing speed adjustment of the axial flow fan.

[0014] As a further improvement of the present invention, a protective net is detachably installed at the air inlet end of the fan housing to prevent the fan from sucking in large debris and preventing the large debris from damaging the fan blade assembly.

[0015] As a further improvement of the present invention, a cleaning unit is provided at the output end of the motor, and the cleaning unit includes pulley one, pulley two, a belt, a transmission gear, a transmission shaft, an engaging wheel ring and a plurality of cleaning parts; the transmission shaft can be detachably installed inside the fan housing near the wall, and the two ends are respectively connected with pulley two and the transmission gear key pin; pulley one can be detachably installed at the output end of the motor, and pulley one and pulley two are driven by a belt; the engaging wheel ring is located at the air inlet end of the fan housing and is rotatably connected to the fan housing; a plurality of cleaning parts are evenly and detachably installed on one side of the engaging wheel ring close to the air inlet end, and extend along the outer periphery of the engaging wheel ring to the center of the air inlet end of the fan housing; the cleaning part contacts the protective net, and is used to clean the dust remaining at the air inlet end while the axial flow fan is taking in air.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: by arranging a sealed chamber in the fan casing of a variable speed and low noise axial flow fan of the present invention to reduce the internal noise of the axial flow fan, the transmission of the collision noise between the internal airflow of the fan and the fan blade assembly to the outside is reduced, thereby achieving the purpose of noise reduction; by arranging a vacuum pump to extract the gas in the sealed chamber, it is made more difficult for the internal noise of the axial flow fan to be transmitted to the outside, thereby improving the noise reduction effect; by arranging a protective net and a cleaning unit at the air inlet end of the fan casing, it is possible to filter larger volume debris in time and avoid the protective net from absorbing dust, thereby avoiding affecting the air intake efficiency of the air inlet end of the axial flow fan; by arranging a variable speed assembly to adjust the position of the shaft sleeve to realize the change of the speed of the axial flow fan, thereby achieving the purpose of speed regulation of the axial flow fan; by arranging a moving wheel and a brake plate, the movement of the axial flow fan is made more convenient, and at the same time, by arranging a pad elastically connected to the pedal at the rear end of the brake plate, the impact or vibration of the axial flow fan during operation can be reduced, thereby improving the stability of the equipment operation and also improving the noise reduction effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the present invention; Figure 2 It is a schematic diagram of the internal structure of the fan housing of the present invention; Figure 3 It is a schematic diagram of the support frame structure of the present invention; Figure 4 It is a schematic diagram of the structure of the mobile wheel of the present invention; Figure 5 It is a schematic diagram of the structure of the speed change assembly of the present invention; Figure 6 It is a schematic diagram of the cleaning unit structure of the present invention.

[0018] Description of the numbers in the figure: 1 support frame, 11 frame body, 12 moving wheel, 13 braking device, 131 connecting plate, 132 braking plate, 1321 elliptical wheel part, 1322 pedal, 1323 pad, 133 torsion spring, 2 fan housing, 21 outer shell, 22 inner shell, 23 support seat, 24 vacuum pump, 25 intake pipe, 26 exhaust pipe, 27 protection net, 3 fan body, 31 fan blade assembly, 32 speed change assembly, 321 driving shaft, 322 gear 1, 323 gear 2, 324 driven shaft, 325 bushing, 326 gear 3, 327 gear 4, 33 motor, 4 cleaning unit, 41 pulley 1, 42 pulley 2, 43 belt, 44 transmission gear, 45 transmission shaft, 46 meshing wheel ring, 47 cleaning parts. DETAILED DESCRIPTION

[0019] Specific embodiment 1: Please refer to Figure 1-Figure 6 A variable speed low noise axial flow fan comprises a support frame 1, a fan casing 2 and a fan body 3; the fan body 3 is detachably mounted on the inner wall of the fan casing 2, the support frame 1 is located on both sides of the fan casing 2, and is detachably connected to both sides of the fan casing 2 by bolts, for supporting the fan casing 2.

[0020] The fan body 3 includes a fan blade assembly 31, a speed change assembly 32 and a motor 33. The motor 33 is detachably installed inside the fan housing 2. The motor 33 cooperates with the fan blade assembly 31 through the speed change assembly 32 to drive the fan blade assembly 31 to rotate.

[0021] The fan housing 2 includes an outer shell 21 and an inner shell 22. The front end of the outer shell 21 is fixedly connected to the inner shell 22, and the rear end of the outer shell 21 is detachably connected to the inner shell 22 via a cover plate. A sealed cavity is formed between the inner wall of the outer shell 21 and the outer wall of the inner shell 22 to reduce noise inside the axial flow fan.

[0022] Specifically, Figure 2 A support base 23 is provided on the top of the fan housing 2 as shown, and a vacuum pump 24 is detachably installed on the upper part of the support base 23. The air inlet pipe 25 of the vacuum pump 24 is connected to the inside of the sealed cavity, and is used to extract a vacuum inside the sealed cavity, thereby reducing the transmission of the sound inside the fan casing 12 to the outside world, thereby achieving the effect of reducing the noise inside the fan housing 2; the exhaust pipe 26 is located along the inner shell 22 of the fan to the position of the fan blade assembly 31, and can remove dust from the surface of the fan blade assembly 31 in a direction perpendicular to the air inlet direction, thereby preventing dust from adhering to the sides and back of the fan blade assembly 31 that are not easily blown away, thereby improving the cleaning effect, and preventing the fan blade assembly 31 from rotating unbalancedly due to dust, thereby affecting the stability of the rotation of the fan blade assembly 31.

[0023] Specifically, Figure 3The support frame 1 shown includes a frame body 11, a plurality of moving wheels 12 and a plurality of braking devices 13. The moving wheels 12 are detachably mounted on the bottom of the frame body 11 by bolt connection and are used to adjust the position of the fan; the braking devices 13 are detachably mounted on the sides of the plurality of moving wheels 12 and are used to fix the moving wheels 12 to keep the fan stationary when working.

[0024] Specifically, Figure 4 The braking device 13 shown includes a pair of connecting plates 131, a braking plate 132 and a torsion spring 133. One end of the pair of connecting plates 131 is detachably connected to the two sides of the moving wheel 12, and the braking plate 132 is hinged to the other end of the connecting plate 131; the torsion spring 133 is detachably installed on one side of the connecting plate 131, and the torsion spring 133 contacts the braking plate 132. When the braking plate 132 rotates, it brakes the moving wheel 12 and squeezes the torsion spring 133. The torsion spring 133 generates a reverse force to reset the braking plate 132 after braking the moving wheel 12.

[0025] Specifically, the side of the brake plate 132 close to the moving wheel 12 is the elliptical wheel portion 1321, and the side away from the moving wheel 12 is the pedal 1322; the elliptical wheel portion 1321 abuts against the torsion spring 133, which is used to reset after the pedal 1322 is compressed and causes the elliptical wheel portion 1321 to rotate; a pad 1323 is detachably installed at the lower part of the pedal 1322, and the pad 1323 and the pedal 1322 can be elastically connected by a spring, which can slow down the transmission of vibration of the fan body 3 to the support frame 1, thereby achieving the effect of reducing the noise of the axial flow fan.

[0026] Specifically, Figure 5 The speed change assembly 32 shown includes a driving shaft 321, a gear 1 322, a gear 2 323, a driven shaft 324, a sleeve 325, a gear 326 and a gear 4 327. The driving shaft 321 is connected to the output end of the motor 33, and the gear 1 322 and the gear 2 323 are respectively keyed with the driving shaft 321; one end of the driven shaft 324 is detachably connected to the fan blade assembly 31 by keying, and the inner shell 22 is fixedly installed with a pull arm, and the other end of the driven shaft 324 is rotatably connected to the pull arm; the sleeve 325 is slidably connected to the driven shaft 324, and the gear 326 and the gear 4 327 are respectively keyed with the sleeve 325 Pin fit; Gear 1 322 can mesh with Gear 3 326, Gear 2 323 can mesh with Gear 4 327, and the distance between Gear 1 322 and Gear 2 323 is greater than the distance between Gear 3 326 and Gear 4 327; The sleeve 325 can be manually slid or electrically driven to switch the meshing of Gear 1 322 and Gear 3 326 to the meshing of Gear 2 323 and Gear 4 327, thereby changing the rotation speed of the fan blade assembly 31 by switching the transmission ratio of Gear 1 322 and Gear 3 326 to the transmission ratio of Gear 2 323 and Gear 4 327, thereby realizing the variable speed adjustment of the axial flow fan.

[0027] Specifically, a protective net 27 is detachably installed at the air inlet end of the fan housing 2 to prevent the fan from sucking in large debris and preventing the large debris from damaging the fan blade assembly 31.

[0028] Specifically, Figure 6 The output end of the motor 33 is provided with a cleaning unit 4, and the cleaning unit 4 includes a pulley 1 41, a pulley 2 42, a belt 43, a transmission gear 44, a transmission shaft 45, a meshing wheel ring 46 and a plurality of cleaning members 47; the transmission shaft 45 is detachably mounted in the fan housing 2 near the wall, and the two ends are respectively connected with the pulley 2 42 and the transmission gear 44 by key pins; the pulley 1 41 is detachably mounted on the output end of the motor 33, and the pulley 1 41 and the pulley 2 42 are driven by the belt 43; the meshing wheel ring 46 is located at the air inlet end of the fan housing 2, and is rotatably connected to the fan housing 2; a plurality of cleaning members 47 are evenly detachably mounted on the meshing wheel ring 46 near the fan housing 2 On one side near the air inlet end, it extends along the outer periphery of the meshing wheel ring 46 to the center of the air inlet end of the fan housing 2; the cleaning member 47 contacts the protective net 27, and the contact position between the cleaning member 47 and the protective net 27 can be a brush, which is used to clean the dust remaining on the protective net 27 while the axial flow fan is taking in air; when the axial flow fan is working, the motor 33 drives the fan blade assembly 31 to rotate and at the same time drives the transmission shaft 45 where the pulley 2 42 is located to rotate through the pulley 1 41, and the transmission shaft 45 drives the transmission gear 44 to drive the meshing wheel ring 46 to rotate around the air inlet end of the axial flow fan, thereby driving the cleaning member 47 to clean the dust on the surface of the protective net 27 to avoid the influence of dust on the air inlet of the axial flow fan.

[0029] During use, the vacuum pump 24 is started to evacuate the inside of the sealed chamber, and the evacuated gas is passed through the exhaust pipe 26 to clean the side of the fan blade assembly 31; the motor 33 is turned on to drive the fan blade assembly 31 to rotate through the speed change assembly 32, and the collision between the airflow and the fan blade assembly 31 and the noise of the motor 33 will be isolated by the vacuum sealed chamber, thereby achieving the purpose of reducing the noise during the operation of the fan body 3; the protective net 27 is arranged at the air inlet end of the fan housing 2 to filter larger volume debris, and under the drive of the motor 33, through the transmission of the pulley 1 41 and the pulley 2 42, the cleaning members 47 installed on the meshing wheel ring 46 can clean the dust adsorbed on the surface of the protective net 27, so as to avoid the accumulation of dust affecting the air intake efficiency of the air inlet end of the axial flow fan; at the same time, during the operation of the axial flow fan, the pedal 1322 and the pad 1323 elastically connected at the rear end of the brake plate 132 are used to reduce the impact or vibration of the axial flow fan during operation, improve the stability of the equipment operation, and also improve the noise reduction effect.

[0030] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A variable speed, low noise axial flow fan. Features: The fan housing (2) comprises a support frame (1), a fan housing (2) and a fan body (3); the fan body (3) is detachably connected to the inner wall of the fan housing (2); the support frame (1) is located on both sides of the fan housing (2) and is detachably connected to both sides of the fan housing (2) for supporting the fan housing (2); The fan body (3) comprises a fan blade assembly (31), a speed change assembly (32) and a motor (33); the motor (33) is detachably mounted inside the fan housing (2); the motor (33) is detachably connected to the fan blade assembly (31) via the speed change assembly (32) and is used to drive the fan blade assembly (31) to rotate; The fan housing (2) comprises an outer shell (21) and an inner shell (22), wherein the front end of the outer shell (21) is fixedly connected to the inner shell (22), and the rear end of the outer shell (21) is detachably connected to the inner shell (22), so as to form a sealed cavity between the inner wall of the outer shell (21) and the outer wall of the inner shell (22), so as to reduce the internal noise of the axial flow fan.

2. A variable speed and low noise axial flow fan according to claim 1, Features: A support seat (23) is provided on the top of the fan housing (2); a vacuum pump (24) is detachably mounted on the upper portion of the support seat (23); an air inlet pipe (25) of the vacuum pump (24) is connected to the interior of the sealed cavity and is used to extract a vacuum from the interior of the sealed cavity; an exhaust pipe (26) is located along the fan inner housing (2) to the position of the fan blade assembly (31) and is used to remove dust from the surface of the fan blade assembly (31).

3. A variable speed and low noise axial flow fan according to claim 1, Features: The support frame (1) comprises a frame body (11), a plurality of moving wheels (12) and a plurality of braking devices (13); the moving wheels (12) are detachably mounted on the bottom of the frame body (11) and are used to adjust the position of the fan; the braking devices (13) are detachably mounted on the sides of the plurality of moving wheels (12) and are used to fix the moving wheels (12).

4. A variable speed and low noise axial flow fan according to claim 3, Features: The braking device (13) comprises a pair of connecting plates (131), a braking plate (132) and a torsion spring (133); one end of the pair of connecting plates (131) is detachably connected to two sides of the moving wheel (12); the braking plate (132) is hinged to the other end of the connecting plate (131); the torsion spring (133) is detachably mounted on one side of the connecting plate (131); the torsion spring (133) abuts against the braking plate (132) and is used for the braking plate (132) to reset after braking the moving wheel (132).

5. A variable speed and low noise axial flow fan according to claim 4, Features: The side of the brake plate (132) close to the moving wheel (12) is an elliptical wheel portion (1321), and the side away from the moving wheel (12) is a pedal (1322); the elliptical wheel portion (1321) abuts against a torsion spring (133) and is used to reset after the pedal (1322) is compressed and causes the elliptical wheel portion (1321) to rotate; a pad (1323) is detachably mounted on the lower part of the pedal (1322), and the pad (1323) and the pedal (1322) are elastically connected via a spring and are used to reduce the transmission of vibration of the fan body (3) to the support frame (1).

6. A variable speed and low noise axial flow fan according to claim 1, Features: The air inlet end of the fan housing (2) is detachably provided with a protective net (27) for preventing the fan from sucking in large debris.

7. A variable speed and low noise axial flow fan according to claim 1, Features: The speed change assembly (32) comprises a driving shaft (321), a gear 1 (322), a gear 2 (323), a driven shaft (324), a shaft sleeve (325), a gear 3 (326) and a gear 4 (327); the driving shaft (321) is connected to the output end of the motor (33); the gear 1 (322) and the gear 2 (323) are respectively key-engaged with the driving shaft (321); one end of the driven shaft (324) is detachably connected to the fan blade assembly (31); a pull arm (221) is fixedly mounted on the inner shell (22); and the driven shaft (324) is The other end is rotatably connected to the pull arm (221); the shaft sleeve (325) is slidably connected to the driven shaft (324); gear three (326) and gear four (327) are key-matched with the shaft sleeve (325) respectively; gear one (322) matches gear three (326), gear two (323) matches gear four (327), and the spacing between gear one (322) and gear two (323) is greater than the spacing between gear three (326) and gear four (327), so as to slide the shaft sleeve (325) to switch the rotation speed of the fan blade assembly (31).

8. A variable speed and low noise axial flow fan according to claim 1, Features: A cleaning unit (4) is provided at the output end of the motor (33), the cleaning unit (4) comprising a belt pulley 1 (41), a belt pulley 2 (42), a belt (43), a transmission gear (44), a transmission shaft (45), a meshing wheel ring (46) and a plurality of cleaning members (47); the transmission shaft (45) is detachably mounted inside the fan housing (2) near the wall, and its two ends are respectively connected by key pins to the belt pulley 2 (42) and the transmission gear (44); the belt pulley 1 (41) is detachably mounted at the output end of the motor (33), and the belt pulley 1 (41) and the belt pulley 2 (42) are driven by the belt (43); the meshing wheel ring (46) is located at the air inlet end of the fan housing (2) and is rotatably connected to the fan housing (2); and a plurality of cleaning members (47) are evenly detachably mounted on one side of the meshing wheel ring (46) near the air inlet end, and extend along the outer circumference of the meshing wheel ring (46) to the center of the air inlet end of the fan housing (2), and are used to clean dust remaining at the air inlet end.

Images