CN113323896A

CN113323896A - Axial-flow fan

Info

Publication number: CN113323896A
Application number: CN202110550362.8A
Authority: CN
Inventors: 王家倍; 张慧
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-05-20
Filing date: 2021-05-20
Publication date: 2021-08-31

Abstract

The invention relates to the technical field of ventilators, in particular to an axial-flow fan, which comprises a cylinder body, wherein a fixing ring is fixed at the left end of the cylinder body, a protective device is fixed at the middle position of the fixing ring, a fixing rod is fixed at the right end of the protective device, a hub is fixed in the cylinder body, a hub fixing piece is fixed at the position between the hubs, fan blades are fixed on the hub, a rotating shaft is fixedly connected at the right end of the hub, a motor is fixed at the right end of the rotating shaft, a gear is fixed at the lower end of a fan blade base, a spring is arranged in the hub, gears and clamping structures are respectively arranged at the lower end of the fan blade base and in the hub, the deflection angle of the fan blades can be adjusted, so that the air volume and the air pressure of the axial-flow fan can be adjusted under the condition that the rotating speed is not changed, and the protective device and the cylinder body are fixedly clamped, the disassembly and the replacement are very convenient.

Description

Axial-flow fan

Technical Field

The invention relates to the technical field of ventilators, in particular to an axial-flow type fan.

Background

The axial-flow fan is an air flow in the same direction as the axis of the fan blade, such as an electric fan, an air conditioner external fan is an axial-flow running fan, the axial-flow fan is also called a local fan, the axial-flow fan is a fan commonly used by industrial and mining enterprises, the axial-flow fan is different from a common fan, the motor and the fan blade of the axial-flow fan are both arranged in a cylinder, the appearance of the axial-flow fan is a cylinder, the axial-flow fan is used for local ventilation, the axial-flow fan is convenient to install, obvious and safe in ventilation effect, and can be connected with the cylinder to send air to a designated area.

The existing market is mainly provided with a centrifugal fan and an axial flow fan, and compared with the centrifugal fan, the axial flow fan does not twist the flow direction of a medium in an air pipe, is convenient to install, but has low air volume and low air pressure, and is not higher than the working efficiency of the centrifugal fan in many times; although the existing axial flow fan is convenient to install, the replacement of some parts is still very complicated; the ventilation is carried out in places with more catkins or fallen leaves, and the cleaning of the filter screen is very frequent.

To this end, an axial fan is proposed.

Disclosure of Invention

The invention aims to provide an axial flow fan, which can adjust the deflection angle of fan blades according to the situation, adjust the air volume and the air pressure of the axial flow fan under the condition of unchanged rotating speed, simultaneously adopts clamping fixation between a protective device and a cylinder body, is very convenient and fast to detach and install, can effectively clean floccules and fallen leaves on the surface of a filter screen due to the special design of the protective device, and is particularly suitable for ventilating places with more fallen leaves and catkins around.

To solve the problems set forth in the background art described above.

In order to achieve the purpose, the invention provides the following technical scheme: an axial flow fan comprises a barrel body, wherein a fixing ring is fixedly installed at the left end of the barrel body, a threaded hole is formed in the fixing ring, a groove is formed in the inner ring of the fixing ring, a protective device is fixedly installed at the middle position of the fixing ring, a fixing rod is fixedly installed at the right end of the protective device, a nameplate is fixedly installed on the barrel body, a switch is fixedly installed at the right side of the nameplate, a hub is fixedly installed inside the barrel body, a hub fixing part is fixedly installed at the position between the hubs, a mounting hole is formed in the hub, a fan blade base is fixedly installed in the mounting hole, a fan blade is fixedly installed at the upper end of the fan blade base, a connecting part is fixedly installed at the middle position of the barrel body, a support frame is fixedly installed below the barrel body, a rotating shaft is fixedly connected with the right end of the hub, and a motor is fixedly connected with the right end of the rotating shaft, fixed mounting has the C template on the motor, fixed mounting has the bolt on the C template, fixed mounting has the packing ring on the bolt, fixed mounting has the screw on the flabellum base, wheel hub's inboard fixed mounting has the fixed plate, the lower extreme fixed mounting of flabellum base has the gear, wheel hub's inside is provided with the spring, the equal fixed mounting in upper and lower both ends of spring has the backing plate, motor and switch electric connection.

Through adopting above-mentioned technical scheme, open the switch, the motor begins to rotate, drives the pivot and rotates for rotate with pivot fixed mounting's wheel hub, wheel hub drives the flabellum again and rotates, the continuous wind-force that produces of source, the protector that sets up both can prevent that someone from touching the flabellum carelessly and causing the cut wound, also can prevent to have great object to inhale the inside of stack shell, cause the damage to each part especially flabellum.

Preferably, the flabellum is provided with ten groups altogether, ten groups of flabellum evenly distributed are on wheel hub, mutually support fixed connection through flabellum base, mounting hole and screw between flabellum and the wheel hub, swing joint between flabellum and the flabellum base, welded fastening between flabellum and the gear, an limit and the gear of fixed plate pass through dentate structure fixed connection on the fixed plate, pass through backing plate fixed connection between gear and the spring.

Through adopting above-mentioned technical scheme, press the flabellum for the gear descends, breaks away from the fixed plate, then adjusts the deflection angle of flabellum according to the circumstances, thereby adjust axial-flow fan's amount of wind and wind pressure under the condition of the rotational speed that need not adjust the motor, thereby satisfy the demand, adjust the back, loosen the flabellum, the spring promotes the gear rise this moment and fixes with the fixed plate meshing, guarantees that the flabellum can not take place to rotate.

Preferably, four groups of fixing rods are arranged, the four groups of fixing rods are welded and fixed at four top points of the right end of the protection device, four groups of grooves are arranged, the four groups of grooves are distributed at the four top points of the inner surface of the cylinder body, the cross sections of the grooves are semicircular, and the fixing rods are clamped and fixed with the grooves.

Through adopting above-mentioned technical scheme, when protector installs on axial-flow fan, can be through the block of dead lever and recess and the tension of dead lever itself firmly fixed, and when dismantling the change, transversely can take out very convenient hard easily.

Preferably, gu fixed ring is provided with two sets ofly altogether, two sets of stationary ring symmetric distribution are both ends about the stack shell, a plurality of groups screw hole have all been seted up on two sets of stationary rings, mutually support fixed connection through solid fixed ring, screw hole and screw between stack shell and the dryer.

Through adopting above-mentioned technical scheme, can select whether to connect the dryer according to the demand, guaranteed the convenience of dryer installation and dismantlement simultaneously.

Preferably, the cylinder body is fixedly connected with the support frame through a connecting piece.

Through adopting above-mentioned technical scheme, can adjust the inclination of stack shell through the adjusting connection spare to satisfy different demands.

Preferably, the C-shaped plates are provided with four groups, the four groups of C-shaped plates are distributed on the motor, the bolts and the gaskets are provided with a plurality of groups, two groups of bolts and gaskets are fixedly mounted on each group of C-shaped plates, and the barrel body and the motor are fixedly mounted through the mutual matching of the C-shaped plates, the bolts and the gaskets.

Through adopting above-mentioned technical scheme, can guarantee firmly and steadily between motor and the stack shell, avoid the reduction of the amount of wind and the wind pressure that the flabellum leads to because of the vibrations of motor at the in-process of work.

Preferably, the springs are provided with a plurality of groups, the gears are provided with a plurality of groups, and three groups of springs are fixedly mounted below each group of gears.

Preferably, the guard comprises: the protective device comprises an air inlet cylinder, a first sliding block, a filter screen, a rubber band, a second fan blade, a second sliding block, a connecting shaft, a belt wheel mechanism, a sliding groove, a telescopic rod and a connecting rod, wherein the left end of the air inlet cylinder is provided with the sliding groove, the left end of the air inlet cylinder is provided with an inward bulge, the bulge is connected with the filter screen through a bolt, the middle part of the filter screen protrudes towards the left end, the second fan blade is arranged at the middle part of the air inlet cylinder, the second fan blade is arranged on the connecting shaft, the left end of the connecting shaft is connected with two groups of conical gear sets through a transmission shaft, one of the two groups of conical gear sets is connected with the belt wheel mechanism, the belt wheel mechanism comprises a belt wheel, the belt wheel is connected with one of the two groups of conical gear sets and is positioned at the bottom end inside the air inlet cylinder, the belt wheel is connected with the second belt wheel through a belt, and the second belt wheel is arranged on a mounting seat at the top end inside the air inlet cylinder, the first slide is connected with a belt of the belt wheel mechanism, the left end of the first slide block is connected with the right end of the connecting rod, a groove is formed in the telescopic rod along the long direction, the left end of the connecting rod is installed in the groove, the two ends of the telescopic rod are respectively provided with a second slide block, the second slide block is located in the chute, a rubber band is connected between the two slide blocks, and the rubber band is arranged on the surface of the filter screen.

Preferably, the cross-section of rubber band is square, and the rubber band surface is provided with crisscross circular arc incision, and the rubber band adopts the silica gel material, more anti-oxidant and high temperature resistant.

Through adopting above-mentioned technical scheme, can guarantee that the spring provides sufficient holding power to avoid gear and fixed plate to take place the slippage, cause the not hard up of flabellum, thereby influence the work of whole axial-flow fan.

Compared with the prior art, the invention has the beneficial effects that:

1. the gear and the clamping structure are respectively arranged at the lower end of the fan blade base and in the hub, and the deflection angle of the fan blade can be adjusted, so that the air volume and the air pressure of the axial flow fan can be adjusted under the condition of not changing the rotating speed, and the use requirement is met;

2. what adopt between protector and the stack shell is that the block is fixed, and the power of the dead lever through protector on and the inside recess block of stack shell and the tension of dead lever itself are firmly fixed in the installation, and when needing to dismantle the change, can take out very convenient easily by horizontal hard.

3. Because protector's special design, make the second flabellum rotate through wind-force, the second flabellum passes through bevel gear group and drives the band pulley mechanism operation, band pulley mechanism drives and reciprocates through the second slider that telescopic link and connecting rod are connected with first slider, rubber band on the second slider also follows and reciprocates, the rubber band is at the flexible in-process of telescopic link, the second slider drives the rubber band and stretches out and draws back, arch on the rubber band opens along the crackle and closes, can clear up the tight flocculus of clamp effectively, the attachment on clearance filter screen surface that can be better, the specially adapted ventilates to the place that leaves and catkin are more around.

Drawings

FIG. 1 is a schematic view of the complete structure of the present invention;

FIG. 2 is a full left side view of the present invention;

FIG. 3 is a side view of the internal structure of the present invention;

FIG. 4 is a side view of the motor of the present invention;

FIG. 5 is a cross-sectional view of the fan blade and hub of the present invention;

FIG. 6 is a cross-sectional exploded view of the gear and retaining plate of the present invention;

FIG. 7 is a cross-sectional view of the guard;

FIG. 8 is a left side view of the guard;

FIG. 9 is a front view of a rubber band;

figure 10 is a cross-sectional view of a rubber band.

In the figure: 1. a guard; 2. fixing the rod; 3. a fixing ring; 4. a threaded hole; 5. a barrel body; 6. a nameplate; 7. a switch; 8. a support frame; 9. a connecting member; 10. a groove; 11. a first fan blade; 12. a fan blade base; 13. mounting holes; 14. a hub; 15. a hub securing member; 16. a rotating shaft; 17. a motor; 18. a bolt; 19. c-shaped plates; 20. a gasket; 21. a screw; 22. a gear; 23. a spring; 24. a fixing plate; 25. a base plate; 26. an air inlet cylinder; 27. a slider; 28. a filter screen; 29. a rubber band; 30. a snap ring; 31. a first connecting shaft; 32. a second fan blade; 33. a second connecting shaft; 331. a belt; 332. a first belt wheel; 333. and a second belt wheel.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1 to 10, the present invention provides an axial flow fan, which comprises: an axial flow fan, as shown in fig. 1 to 8, comprises a barrel 5, a fixing ring 3 is fixedly installed at the left end of the barrel 5, a threaded hole 4 is opened on the fixing ring 3, a groove 10 is opened on the inner ring of the fixing ring 3, a protection device 1 is fixedly installed at the middle position of the fixing ring 3, a fixing rod 2 is fixedly installed at the right end of the protection device 1, a nameplate 6 is fixedly installed on the barrel 5, a switch 7 is fixedly installed at the right side of the nameplate 6, a hub 14 is fixedly installed in the barrel 5, a hub fixing member 15 is fixedly installed at the position between the hubs 14, a mounting hole 13 is opened on the hub 14, a fan blade base 12 is fixedly installed in the mounting hole 13, a first fan blade 11 is fixedly installed at the upper end of the fan blade base 12, a connecting member 9 is fixedly installed at the middle position of the barrel 5, a support frame 8 is fixedly installed below the barrel 5, and a rotating shaft 16 is fixedly connected at the right end of the hub 14, the right-hand member fixedly connected with motor 17 of pivot 16, fixed mounting has C template 19 on the motor 17, fixed mounting has bolt 18 on the C template 19, fixed mounting has packing ring 20 on the bolt 18, fixed mounting has screw 21 on the flabellum base 12, wheel hub 14's inboard fixed mounting has fixed plate 24, the lower extreme fixed mounting of flabellum base 12 has gear 22, wheel hub 14's inside is provided with spring 23, the equal fixed mounting in upper and lower both ends of spring 23 has backing plate 25, motor 17 and switch 7 electric connection.

By adopting the technical scheme, the switch 7 is turned on, the motor 17 starts to rotate to drive the rotating shaft 16 to rotate, the hub 14 fixedly mounted with the rotating shaft 16 rotates, the hub 14 drives the fan blades 11 to rotate again, wind power is continuously generated, and the arranged protection device 1 can prevent people from accidentally touching the fan blades 11 to cause cutting injury and also can prevent large objects from being sucked into the barrel body 5 to damage various parts, particularly the fan blades 11.

Specifically, as shown in fig. 5, the first blades 11 are provided with ten groups, the ten groups of first blades 11 are uniformly distributed on the hub 14, the first blades 11 are mutually matched and fixedly connected with the hub 14 through the blade base 12, the mounting hole 13 and the screw 21, the first blades 11 are movably connected with the blade base 12, the first blades 11 are welded and fixed with the gear 22, one edge of the fixing plate 24 is fixedly connected with the gear 22 through the tooth-shaped structure on the fixing plate 24, and the gear 22 is fixedly connected with the spring 23 through the backing plate 25.

Through adopting above-mentioned technical scheme, press first flabellum 11 for gear 22 descends, break away from fixed plate 24, then adjust first flabellum 11 deflection angle according to the condition, thereby adjust axial fan's amount of wind and wind pressure under the condition of the rotational speed that need not adjust motor 17, thereby satisfy the demand, adjust the back, loosen first flabellum 11, spring 23 promotes gear 22 and rises and fix with the meshing of fixed plate 24 this moment, guarantee that first flabellum 11 can not take place to rotate.

Specifically, as shown in fig. 1, four groups of fixing rods 2 are provided, four groups of fixing rods 2 are welded and fixed at four top points of the right end of the protection device 1, four groups of grooves 10 are provided, four groups of grooves 10 are distributed at four top points of the inner surface of the barrel body 5, the cross section of each groove 10 is semicircular, and the fixing rods 2 and the grooves 10 are clamped and fixed.

Through adopting above-mentioned technical scheme, when protector 1 installed on axial-flow fan, can be through the block of dead lever 2 and recess 10 and the tension of dead lever 2 itself firmly fixed, and when dismantling the change, transversely exert oneself and can take out very conveniently easily.

Specifically, as shown in fig. 1, fixed ring 3 is provided with two sets ofly altogether, and two sets of fixed ring 3 symmetric distribution have all been seted up a plurality of groups of screw hole 4 at both ends about stack shell 5 on two sets of fixed ring 3, and fixed connection is mutually supported through fixed ring 3, screw hole 4 and screw between stack shell 5 and the dryer.

Specifically, as shown in fig. 1, the barrel 5 and the supporting frame 8 are fixedly connected through a connecting member 9.

Through adopting above-mentioned technical scheme, can adjust the inclination of stack shell 5 through adjusting connecting piece 9 to satisfy different demands.

Specifically, as shown in fig. 4, four groups of C-shaped plates 19 are provided, four groups of C-shaped plates 19 are distributed on the motor 17, a plurality of groups of bolts 18 and washers 20 are provided, two groups of bolts 18 and washers 20 are fixedly mounted on each group of C-shaped plates 19, and the barrel 5 and the motor 17 are fixedly mounted by the C-shaped plates 17, the bolts 18 and the washers 20 in a mutually matched manner.

Through adopting above-mentioned technical scheme, can guarantee firmly and steadily between motor 17 and stack shell 5, avoid first flabellum 11 at the in-process of work because the reduction of the amount of wind and the wind pressure that the vibrations of motor 17 lead to.

Specifically, as shown in fig. 5, the springs 23 are provided with a plurality of groups, the gears 22 are provided with a plurality of groups, and three groups of springs 23 are fixedly mounted below each group of gears 22.

Through adopting above-mentioned technical scheme, can guarantee that spring 23 provides sufficient holding power to avoid gear 22 and fixed plate 24 to take place the slippage, cause not hard up of first flabellum 11, thereby influence the work of whole axial-flow fan.

Specifically, as shown in fig. 7 and 8, the protection device 1 includes: the protection device 1 comprises an air inlet cylinder 26, a first sliding block 27, a filter screen 28, a rubber band 29, second fan blades 30, a second sliding block 31, a connecting shaft 32, a belt wheel mechanism 33, a sliding groove 34, an expansion rod 35 and a connecting rod 36, wherein the sliding groove 34 is arranged at the left end of the air inlet cylinder 26, an inward bulge is arranged at the left end of the air inlet cylinder 26, the bulge is connected with the filter screen 28 through a bolt, and the middle part of the filter screen 28 protrudes towards the left end; the air inlet cylinder 26 is provided with a second fan blade 30 at the middle position, the second fan blade 32 is installed on a connecting shaft 32, the left end of the connecting shaft 32 is connected with two sets of conical gear sets through a transmission shaft, one of the two sets of conical gear sets is connected with a belt wheel mechanism 33, the belt wheel mechanism 33 comprises a belt wheel 332, the belt wheel 332 is connected with one of the two sets of conical gear sets and is located at the bottom end inside the air inlet cylinder 26, the belt wheel 332 is connected with the belt wheel 333 through a belt 331, the belt wheel 333 is installed on an installation seat at the top end inside the air inlet cylinder 26, the first slider 27 is connected with the belt 331 of the belt wheel mechanism 33, the left end of the first slider 27 is connected with the right end of a connecting rod 36, a groove is formed in the telescopic rod 35 along the long direction, the left end of the connecting rod 36 is installed in the groove, and the two ends of the telescopic rod 35 are respectively provided with a second slider 31, the second sliding block 31 is positioned in the sliding groove, a rubber band 29 is connected between the two sliding blocks, and the rubber band 29 is arranged on the surface of the filter screen 28.

Through adopting above-mentioned technical scheme, make second flabellum 32 rotate through wind-force, second flabellum 32 drives band pulley mechanism 33 operation through the bevel gear group, band pulley mechanism 33 drives and reciprocates through the second slider 31 that telescopic link 35 and connecting rod 36 are connected with first slider 27, and rubber band 29 on the second slider 31 also follows and reciprocates, has realized the floccule and the fallen leaves on the clearance filter screen 28, has guaranteed that wind energy gets into air inlet cylinder 26 smoothly.

Specifically, as shown in fig. 9 and 10, the rubber band 29 has a square cross section, a circular protrusion is adhered to the surface of the rubber band 29 by glue, a crack is formed in the middle of the protrusion, and the rubber band 29 is made of silica gel and is more resistant to oxidation and high temperature.

Through adopting above-mentioned technical scheme, the rubber band 29 is at the flexible in-process of telescopic link 35, and second slider 31 drives rubber band 29 and stretches out and draws back, and the arch on the rubber band 29 opens and closes along the crackle, can clear up effectively and press from both sides tight flocculus, the attachment on clearance filter screen 28 surface that can be better.

The working principle is as follows: the gear 22 and the clamping structure are respectively arranged at the lower end of the fan blade base 12 and inside the hub 14, and the deflection angle of the first fan blade 11 can be adjusted, so that the air volume and the air pressure of the axial flow fan can be adjusted under the condition of not changing the rotating speed, and the use requirement is met; the protection device 1 and the barrel body 5 are fixed in a clamping manner, the protection device is firmly fixed by clamping force of the fixing rod 2 on the protection device 1 and a groove in the barrel body 5 and tension of the fixing rod 2, and the protection device can be easily taken out by transversely exerting force when needing to be detached and replaced, so that the protection device is very convenient and fast; because protector 1's special design, make second flabellum 32 rotate through wind-force, second flabellum 32 drives band pulley mechanism 33 operation through the bevel gear group, band pulley mechanism 33 drives and reciprocates through the second slider 31 that telescopic link 35 and connecting rod 36 are connected with first slider 27, rubber band 29 on the second slider 31 also follows and reciprocates, has realized the floccule and the fallen leaves on the clearance filter screen 28, and specially adapted ventilates to the place that falls leaves and catkin more around.

The using method comprises the following steps: firstly, the deflection angle of a first fan blade 11 is adjusted, the inclination angle of a barrel body 5 is adjusted, whether the wind barrel needs to be connected or not is selected, then a switch 7 is started, a motor 17 starts to rotate to drive a rotating shaft 16 to rotate, so that a hub 14 fixedly installed with the rotating shaft 16 rotates, the hub 14 drives the first fan blade 11 to rotate, wind is continuously sucked into the barrel body 5 from a protection device 1, meanwhile, a second fan blade 32 rotates through wind power, the second fan blade 32 drives a belt wheel mechanism 33 to operate through a bevel gear set, the belt wheel mechanism 33 drives a second sliding block 31 connected with a first sliding block 27 through a telescopic rod 35 and a connecting rod 36 to move up and down, a rubber band 29 on the second sliding block 31 also moves up and down, the rubber band 29 drives the rubber band 29 to stretch and retract in the stretching process of the telescopic rod 35, the second sliding block 31 drives the rubber band 29 to stretch and close, and clamping floccules can be effectively cleaned, the attachment on clearance filter screen 28 surface that can be better, protector 1 that sets up at the front end of stack shell 5 both can prevent that someone from touching first flabellum 11 carelessly and causing the cut wound, also can prevent to have great object to be inhaled the inside of stack shell 5, especially first flabellum 11 to each part causes the damage, can also effectively clear up the foreign matter on the protection network, improve the ventilation quality, the specially adapted ventilates to the place that leaves and catkin are more around, after the use is accomplished, the power is turned off, place safely, wait for next use.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. An axial-flow fan, includes stack (5), its characterized in that: the fan blade fixing device is characterized in that a fixing ring (3) is fixedly mounted at the left end of the barrel body (5), a threaded hole (4) is formed in the fixing ring (3), a groove (10) is formed in the inner ring of the fixing ring (3), a protection device (1) is fixedly mounted at the middle position of the fixing ring (3), a fixing rod (2) is fixedly mounted at the right end of the protection device (1), a nameplate (6) is fixedly mounted on the barrel body (5), a switch (7) is fixedly mounted at the right side of the nameplate (6), a hub (14) is fixedly mounted in the barrel body (5), a hub fixing piece (15) is fixedly mounted at the position between the hubs (14), a mounting hole (13) is formed in the hub (14), a fan blade base (12) is fixedly mounted in the mounting hole (13), and a first fan blade (11) is fixedly mounted at the upper end of the fan blade base (12), the middle position of the barrel body (5) is fixedly provided with a connecting piece (9), the lower part of the barrel body (5) is fixedly provided with a support frame (8), the right end of the hub (14) is fixedly connected with a rotating shaft (16), the right end of the rotating shaft (16) is fixedly connected with a motor (17), the motor (17) is fixedly provided with a C-shaped plate (19), the C-shaped plate (19) is fixedly provided with a bolt (18), the bolt (18) is fixedly provided with a gasket (20), the fan blade base (12) is fixedly provided with a screw (21), the inner side of the hub (14) is fixedly provided with a fixing plate (24), the lower end of the fan blade base (12) is fixedly provided with a gear (22), the inside of the hub (14) is provided with a spring (23), and the upper end and the lower end of the spring (23) are fixedly provided with a backing plate (25), the motor (17) is electrically connected with the switch (7).

2. The axial flow fan of claim 1, wherein: first flabellum (11) are provided with ten groups altogether, ten first flabellum (11) evenly distributed of group are on wheel hub (14), between first flabellum (11) and wheel hub (14) through flabellum base (12), mounting hole (13) and screw (21) mutually support fixed connection, swing joint between first flabellum (11) and flabellum base (12), welded fastening between first flabellum (11) and gear (22), an limit and gear (22) of fixed plate (24) are through dentate structure fixed connection on fixed plate (24), pass through backing plate (25) fixed connection between gear (22) and spring (23).

3. The axial flow fan of claim 1, wherein: the fixing rods (2) are provided with four groups, the four groups of fixing rods (2) are welded and fixed at four top points of the right end of the protection device (1), the grooves (10) are provided with four groups, the four groups of grooves (10) are distributed at four top points of the inner surface of the barrel body (5), the cross section of each groove (10) is semicircular, and the fixing rods (2) are clamped and fixed with the grooves (10).

4. The axial flow fan of claim 1, wherein: fixed ring (3) are provided with two sets ofly altogether, two sets of fixed ring (3) symmetric distribution are both ends about stack shell (5), a plurality of groups screw hole (4) have all been seted up on two sets of fixed ring (3), mutually support fixed connection through fixed ring (3), screw hole (4) and screw between stack shell (5) and the dryer.

5. The axial flow fan of claim 1, wherein: the barrel body (5) is fixedly connected with the support frame (8) through a connecting piece (9).

6. The axial flow fan of claim 1, wherein: c template (19) are provided with four groups altogether, four groups of C templates (19) all distribute on motor (17), bolt (18) and packing ring (20) all are provided with a plurality of groups, equal fixed mounting has two sets of bolts (18) and packing ring (20) on every group C template (19), mutually support fixed mounting through C template (17), bolt (18) and packing ring (20) between stack shell (5) and motor (17).

7. The axial flow fan of claim 1, wherein: the spring (23) is provided with a plurality of groups, the gear (22) is provided with a plurality of groups, and three groups of springs (23) are fixedly mounted below each group of gears (22).

8. The axial flow fan of claim 1, wherein: the protection device (1) comprises an air inlet cylinder (26), a first sliding block (27), a filter screen (28), a rubber band (29), a second fan blade (30), a second sliding block (31), a connecting shaft (32), a belt wheel mechanism (33), a sliding groove (34), a telescopic rod (35) and a connecting rod (36), wherein the sliding groove (34) is formed in the left end of the air inlet cylinder (26), an inward bulge is formed in the left end of the air inlet cylinder (26), the bulge is connected with the filter screen (28) through a bolt, the middle of the filter screen (28) protrudes towards the left end, the second fan blade (30) is arranged in the middle of the air inlet cylinder (26), the second fan blade (32) is installed on the connecting shaft (32), the left end of the connecting shaft (32) passes through a transmission shaft and two sets of conical gear sets, one set of the two sets of conical gear sets is connected with the belt wheel mechanism (33), and the belt wheel mechanism (33) comprises a belt wheel (332), first band pulley (332) with a set of connection in two sets of conical gear group just is located the inside bottom of an air inlet section of thick bamboo (26), is connected through belt (331) between band pulley (332) and No. two band pulleys (333), install on the mount pad on the inside top of an air inlet section of thick bamboo (26) No. two band pulleys (333), first slider (27) are connected with belt (331) of band pulley mechanism (33), first slider (27) left end is connected with connecting rod (36) right-hand member, be equipped with the recess along the length direction on telescopic link (35), install connecting rod (36) left end in the recess, telescopic link (35) both ends respectively are equipped with second slider (31), second slider (31) are located the spout, be connected with rubber band (29) between two sliders, rubber band (29) set up the surface at filter screen (28).

9. The axial flow fan of claim 8, wherein: the rubber band (29) is square in cross section, circular protrusions are adhered to the surface of the rubber band (29) through glue, and cracks are formed in the middles of the protrusions.