CN114738319B - Low-noise axial flow fan and using method thereof - Google Patents
Low-noise axial flow fan and using method thereof Download PDFInfo
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- CN114738319B CN114738319B CN202210420434.1A CN202210420434A CN114738319B CN 114738319 B CN114738319 B CN 114738319B CN 202210420434 A CN202210420434 A CN 202210420434A CN 114738319 B CN114738319 B CN 114738319B
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- 230000001360 synchronised effect Effects 0.000 claims abstract description 5
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- 238000000429 assembly Methods 0.000 claims description 6
- 238000013016 damping Methods 0.000 claims description 6
- 239000011521 glass Substances 0.000 claims description 6
- 238000000926 separation method Methods 0.000 claims description 5
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- 238000010521 absorption reaction Methods 0.000 claims description 4
- 230000005484 gravity Effects 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 19
- 230000009467 reduction Effects 0.000 abstract description 15
- 238000009423 ventilation Methods 0.000 abstract description 2
- 239000010410 layer Substances 0.000 description 30
- 239000012530 fluid Substances 0.000 description 6
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/26—Rotors specially for elastic fluids
- F04D29/32—Rotors specially for elastic fluids for axial flow pumps
- F04D29/38—Blades
- F04D29/384—Blades characterised by form
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/26—Rotors specially for elastic fluids
- F04D29/32—Rotors specially for elastic fluids for axial flow pumps
- F04D29/38—Blades
- F04D29/388—Blades characterised by construction
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/40—Casings; Connections of working fluid
- F04D29/52—Casings; Connections of working fluid for axial pumps
- F04D29/54—Fluid-guiding means, e.g. diffusers
- F04D29/541—Specially adapted for elastic fluid pumps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
- F04D29/661—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps
- F04D29/663—Sound attenuation
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
- F04D29/661—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps
- F04D29/663—Sound attenuation
- F04D29/664—Sound attenuation by means of sound absorbing material
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
- F04D29/661—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps
- F04D29/666—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps by means of rotor construction or layout, e.g. unequal distribution of blades or vanes
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
- F04D29/661—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps
- F04D29/667—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps by influencing the flow pattern, e.g. suppression of turbulence
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/72—Wind turbines with rotation axis in wind direction
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The invention discloses a low-noise axial flow fan and a use method thereof, relates to ventilation equipment, and aims to solve the problem that the best noise reduction effect cannot be maintained under the conditions of the shape of saw teeth and arrangement of different rotating speeds of the fan, and the technical scheme is as follows: including dryer and fan impeller, fan impeller includes a plurality of blades, and the trailing edge swing joint of blade has a plurality of bionic sawtooth, and bionic sawtooth and blade are along the tooth height direction relative slip of bionic sawtooth and realize fixedly through the fastener, and a plurality of bionic sawtooth realize a plurality of bionic sawtooth interval synchronous changes through interval equidistance change mechanism. According to the invention, the space and the tooth height of the bionic saw teeth are changed, so that the fan can keep the best noise reduction effect at different rotating speeds, and the practicability of the fan is improved.
Description
Technical Field
The present invention relates to a ventilation apparatus, and more particularly, to a low noise axial flow fan and a method of using the same.
Background
The axial flow fan has very wide application, namely, the air flow in the same direction with the axis of the fan blade, such as an electric fan, and the fan of the air conditioner external unit is an axial flow running fan. This is called "axial flow" because the gas flows parallel to the fan axis. Axial fans are commonly used in applications where flow requirements are high and pressure requirements are low. The axial flow fan fixes the position and moves the air. The axial flow fan mainly comprises a fan impeller and a shell, has a simple structure but has very high data requirements, when the impeller rotates, gas axially enters the impeller from an air inlet, is pushed by blades on the impeller to raise the energy of the gas, and then flows into the guide vane. The guide vane changes deflection airflow into axial flow, simultaneously guides gas into a diffuser pipe, further converts gas kinetic energy into pressure energy, and finally guides the gas into a working pipeline.
The axial flow fan generates noise when in use, and the axial flow fan contains various noise sources, wherein aerodynamic noise is dominant, and other noise sources such as mechanical noise, electromagnetic noise and the like are secondary under normal operation conditions of the fan. According to the spectrum analysis of noise generated by an axial flow fan, the method is characterized in that frequency bands of discrete frequencies are overlapped on a wide frequency band, so that the noise of the fan has two generation mechanisms, namely vortex noise of the wide frequency band and rotation noise of discrete peaks.
Vortex noise is caused by a pulsating force with random properties, and the mechanism of its generation can be analyzed from four aspects:
1. after the airflow on the surface of the blade forms a turbulent boundary layer, pressure pulsation of airflow turbulence in the boundary layer acts on the blade to generate noise. The more severe the turbulent boundary layer development, the more intense the noise generated.
2. When the airflow passes through the blades, vortex separation is generated due to the fact that the boundary layer is developed to a certain extent, particularly when the air passage diffusion degree is large, the vortex separation causes large pulsation, and a classic example is karman vortex street. Periodic vortex shedding will result in a corresponding change in the annular volume and also in a change in the force of the airflow on the blade, which worsens the aerodynamic performance of the blade, so that a strong noise is radiated. Furthermore, vortex shedding at the trailing edge of a blade will be more noisy if it is impacted by a trailing blade.
3. The pulsation of the blade force caused by the turbulence of the beam causes noise. When an airflow with a certain turbulence level flows to the blade, the magnitude of the attack angle of each point on the front edge of the blade depends on the average speed of the airflow and the instantaneous disturbance speed. In turbulent conditions, the instantaneous disturbance speed is obviously irregularly changed, so that the attack angle is irregularly changed, and irregular pulsation of lift force is caused to generate noise.
4. When the air flow flows through the axial flow fan channel, the concave pressure of the blade is larger than the convex pressure, so that a pressure difference is formed, and the air flow flows from the concave to the convex on the end face of the blade, so that secondary vortex noise is formed.
The rotational noise is noise generated by the surrounding gas pressure pulsation caused by the evenly distributed blades on the rotor striking the surrounding gas medium. Such noise is periodic and appears as discrete peaks in the frequency spectrum, the frequency of which is related to the fan speed and is therefore often referred to as rotational noise.
The conventional fan noise reduction scheme is based on the principles of hydrodynamics and aeroacoustics, from the engineering bionics, based on the typical animal flight silence theory, a bionic modification technology is applied, and saw teeth are arranged at the tail edges of the blades, so that the noise of the axial flow fan can be effectively reduced.
According to the difference of the rotating speeds of the axial flow fans, the distance between the saw teeth, the tooth height and the like can have influence on the noise reduction effect, the noise reduction effect is different under the condition that the saw teeth are shaped and arranged at different rotating speeds of the fans, and the best noise reduction effect can not be achieved under many conditions, so that the noise reduction method of the bionic saw teeth has limitations.
There is therefore a need to propose a new solution to this problem.
Disclosure of Invention
Aiming at the defects existing in the prior art, the invention aims to provide a low-noise axial flow fan and a using method thereof.
The technical aim of the invention is realized by the following technical scheme: the utility model provides a low noise axial fan, includes dryer and fan impeller, fan impeller includes a plurality of blades, the trailing edge swing joint of blade has a plurality of bionical saw teeth, bionical saw teeth slides along the relative blade of tooth height direction of bionical saw teeth and sets up and realize fixedly through the fastener, a plurality of bionical saw teeth realizes a plurality of bionical saw teeth interval synchronous change through interval equidistance change mechanism, the inside sunken appearance chamber that is formed with of blade trailing edge, interval equidistance change mechanism includes a pair of fork arm subassembly that cuts, bionical saw teeth installs in the intersection department of fork arm subassembly, the cavity has been seted up to the lateral wall of blade, the cavity opens and shuts through the apron, the spout with appearance chamber intercommunication is seted up to the bottom surface of cavity, the equal sliding connection in the spout of fork arm subassembly homonymy just passes through the fastener and fixes, the equal fixedly connected with in both ends of fork arm subassembly homonymy pass the removal axle of spout, the both sides of spout all are formed with the arc wall of array setting, the fastener is the rotating cap with the arc groove of removing axle threaded connection, be used for fixing in the arc axle that the rotating cap embedding symmetry set up.
Through adopting above-mentioned technical scheme, through not hard up fastener, thereby the distance between bionical sawtooth and the blade is adjustable, thereby change the tooth height of bionical sawtooth, then realize fixing through the fastener, change the distance between the bionical sawtooth through equidistant change mechanism, and change the in-process of distance, equidistant change between the adjacent bionical sawtooth, conveniently adjust the interval between the bionical sawtooth, and keep the precision after adjusting, through interval and the tooth height of changing bionical sawtooth, thereby make the fan homoenergetic keep best noise reduction effect under different rotational speeds, improve the practicality of fan, through opening the apron, slide in the spout through the both ends of scissor arm subassembly, thereby can change the interval between the intersection point department of scissor arm subassembly, and for equidistant change, thereby drive bionical sawtooth change the interval, it is fixed through the fastener, make the tooth height change of bionical sawtooth and interval change can be synchronous fixed after accomplishing, the operation process has been made things convenient for, can seal the cavity through covering, thereby keep the flat on blade surface, through rotating the cap, can drive the cap and break away from the groove, thereby conveniently slide in the spout through removing the axle, adjust the fork arm subassembly homonymy, make the fork arm subassembly pass through rotating cap and change the arc-shaped groove, and then can be fixed through the fixed state of scissor arm.
The invention is further provided with: through holes communicated with two sides of the bionic saw tooth are formed in the bionic saw tooth, the same connecting rod is arranged in the through holes, and two ends of the connecting rod respectively abut against two inner side walls of the containing cavity.
Through adopting above-mentioned technical scheme, when shearing the fork arm subassembly deformation, cut the bionical sawtooth of fork arm subassembly drive and remove, contradict the through-hole inner wall through the connecting rod to make bionical sawtooth can remove along the length direction of connecting rod, and then play the guide effect to bionical sawtooth's removal, keep bionical sawtooth along the rotation direction setting of blade.
The invention is further provided with: the cross points of the scissor arm assemblies are fixedly connected with positioning shafts, and guide grooves which are arranged in a groined shape and used for accommodating movement of the positioning shafts are formed in the inner wall of the accommodating cavity.
Through adopting above-mentioned technical scheme, remove in the guide way through the locating shaft to the deformation to cutting fork arm subassembly plays the guide effect, and then makes the deformation process of cutting fork arm subassembly more steady.
The invention is further provided with: the tail edge of the blade is converged towards the center to form a guide surface, and the edge of the guide surface is abutted against the bionic saw tooth to realize smooth transition between the bionic saw tooth and the blade.
Through adopting above-mentioned technical scheme, the guide surface can make smooth transition between trailing edge and the bionical sawtooth of blade to make the air current flow to bionical sawtooth department along the guide surface, thereby reduce the production and the coming off of vortex, improve the noise reduction effect of fan.
The invention is further provided with: the air duct comprises an inner layer, a thick centrifugal glass cotton layer, a damping layer and an outer layer from inside to outside, wherein a plurality of sound absorption holes distributed in an array are formed in the inner layer.
Through adopting above-mentioned technical scheme, inhale sound hole can effective conduction noise to in the thick centrifugal glass cotton layer, and the fibre in the thick centrifugal glass cotton layer can play good noise reduction effect, and the damping layer can improve the joint strength between skin and the thick centrifugal glass cotton layer, improves the life of dryer.
The invention is further provided with: the blade is integrally formed with an arc convex strip taking the fan impeller as the center of a circle, and the surface of the blade is a non-smooth surface.
By adopting the technical scheme, the direction of the air flow which moves relative to the blades can be changed by the arc convex strips and the non-smooth surface, so that normal micro-vibration which is favorable for reducing tangential adhesion force is generated, the blade interface is discontinuously distributed, and the generated noise is reduced.
The invention is further provided with: the blade is bent along the circumferential direction of the gravity center stacking line, a plurality of air flow holes which are obliquely arranged are formed in the blade, and the first row of air flow holes are distributed in front of separation points of the boundary layers of the blade.
Through adopting above-mentioned technical scheme, the air current hole has changed blade surface static pressure distribution, and the static pressure of blade middle part position is less than blade top and blade root, and the low energy fluid of both ends end wall flows to the blade middle part under the effect of pressure differential to reduced the energy loss that low energy fluid gathered and produced, can slow down the production and the drop of vortex, make fluid flow state more stable, thereby play the effect of making an uproar falls.
The application method of the low-noise axial flow fan is applied to the low-noise axial flow fan and comprises the following steps of: s1, opening a cover plate, and rotating a rotating cap to separate the rotating cap from the arc-shaped groove; s2, changing the interval between the two movable shafts, and moving a plurality of bionic saw teeth through a scissor arm assembly to move and keep equidistant arrangement; s3, moving the two moving shafts to enable the two moving shafts to move in the sliding groove, driving the scissor arm assembly and the bionic saw tooth to move, and changing the tooth height of the bionic saw tooth; s4, rotating the rotary cap to enable the rotary cap to be embedded into the arc-shaped groove, and covering the cover plate.
In summary, the invention has the following beneficial effects: through not hard up fastener to adjustable bionic sawtooth and the distance between the blade, thereby change the tooth height of bionic sawtooth, then realize fixing through the fastener, change the distance between the bionic sawtooth through equidistant change mechanism, and change the in-process of distance, equidistant change between the adjacent bionic sawtooth, conveniently adjust the interval between the bionic sawtooth, and keep the precision after adjusting, through interval and the tooth height that change the bionic sawtooth, thereby make the fan homoenergetic keep the best noise reduction effect under different rotational speeds, improve the practicality of fan.
Drawings
FIG. 1 is a schematic diagram of the structure of the present invention;
FIG. 2 is an enlarged schematic view of portion A of FIG. 1;
FIG. 3 is a schematic structural view of a wind tunnel in the present invention;
FIG. 4 is a partial exploded view of a blade according to the present invention;
FIG. 5 is an enlarged schematic view of portion B of FIG. 4;
FIG. 6 is a partial cross-sectional view of a blade according to the present invention;
fig. 7 is a schematic view of a part of a scissor arm assembly according to the present invention.
In the figure: 1. an air duct; 2. a blade; 3. bionic saw teeth; 4. a fastener; 5. a cavity; 6. a scissor arm assembly; 7. a cavity; 8. a cover plate; 9. a chute; 10. a movable shaft; 11. an arc-shaped groove; 12. a connecting rod; 13. positioning a shaft; 14. a guide groove; 15. a guide surface; 16. an inner layer; 17. thick centrifugal glass cotton layer; 18. a damping layer; 19. an outer layer; 20. a sound absorbing hole; 21. arc convex strips; 22. and an airflow hole.
Description of the embodiments
The present invention will be described in detail below with reference to the accompanying drawings and examples.
A low-noise axial flow fan and a use method thereof are shown in figures 1, 2 and 3, and the low-noise axial flow fan comprises a fan drum 1 and a fan impeller, wherein the fan drum 1 sequentially comprises an inner layer 16, a thick centrifugal glass wool layer 17, a damping layer 18 and an outer layer 19 from inside to outside, a plurality of sound absorption holes 20 which are circular and distributed in an array are formed in the inner layer 16, and the outer layer 19 and the inner layer 16 are made of stainless steel.
As shown in fig. 4, 5, 6 and 7, the fan impeller comprises a plurality of blades 2, the tail edges of the blades 2 are movably connected with a plurality of bionic saw teeth 3, the plurality of bionic saw teeth 3 realize the synchronous change of the space between the plurality of bionic saw teeth 3 through a space equidistant change mechanism, in particular, the tail edges of the blades 2 are inwards sunken to form a containing cavity 5, the space equidistant change mechanism comprises a pair of scissor arm assemblies 6, the scissor arm assemblies 6 are of the prior art, so that the details are not repeated here, the bionic saw teeth 3 are rotationally connected at the intersecting points of the scissor arm assemblies 6, through holes which are along the length direction of the scissor arm assemblies 6 and are communicated with two sides of the bionic saw teeth 3 are formed in the bionic saw teeth 3, a same cylindrical connecting rod 12 is arranged in the through holes, two ends of the connecting rod 12 respectively abut against two inner side walls of the containing cavity 5, the side walls of the blades 2 are provided with cavities 7, the cavity 7 is opened and closed through the cover plate 8, the cover plate 8 and the blades 2 are fixed through four bolts positioned at the corners of the cover plate 8, the bottom surface of the cavity 7 is provided with a chute 9 communicated with the accommodating cavity 5, two ends of the same side of the scissor arm assembly 6 are both connected in the chute 9 in a sliding way and fixed through the fastener 4, the bionic saw teeth 3 are arranged in a sliding way relative to the blades 2 along the tooth height direction of the bionic saw teeth 3 and are also fixed through the fastener 4, two ends of the same side of the scissor arm assembly 6 are bonded with a moving shaft 10 penetrating through the chute 9, two sides of the chute 9 are both provided with arc grooves 11 arranged in an array way, the fastener 4 is a rotating cap in threaded connection with the moving shaft 10, the rotating cap is embedded into the two arc grooves 11 which are symmetrically arranged and used for fixing the moving shaft 10, a positioning shaft 13 is uniformly formed at the crossing point of the scissor arm assembly 6, the inner wall of the containing cavity 5 is provided with a guide groove 14 which is arranged in a groined shape and used for containing the movement of the positioning shaft 13.
As shown in fig. 1, fig. 2 and fig. 4, a guiding surface 15 is formed by converging the tail edge of the blade 2 towards the center, the edge of the guiding surface 15 is abutted against the bionic saw tooth 3 to realize smooth transition between the bionic saw tooth 3 and the blade 2, a plurality of arc-shaped convex strips 21 taking a fan impeller as a circle center are integrally formed on the blade 2, the surface of the blade 2 is a non-smooth surface, the blade 2 is circumferentially bent along a barycenter stacking line of the blade 2, a plurality of air flow holes 22 which are obliquely arranged are formed on the blade 2, and the first air flow holes 22 are distributed in front of separation points of the surface layers of the blade 2.
The application method of the low-noise axial flow fan is applied to the low-noise axial flow fan and comprises the following steps of S1, opening a cover plate 8, and rotating a rotating cap to separate from an arc-shaped groove 11; s2, changing the interval between the two movable shafts 10, and adjusting a plurality of bionic saw teeth 3 to move and keep equidistant arrangement through a scissor arm assembly 6; s3, moving the two moving shafts 10 to move in the sliding groove 9 to drive the scissor arm assembly 6 and the bionic saw teeth 3 to move, and changing the tooth height of the bionic saw teeth 3; s4, rotating the rotary cap to enable the rotary cap to be embedded into the arc-shaped groove 11, and covering the cover plate 8.
Working principle: the cover plate 8 is opened, thereby expose the cavity 7, thereby through not hard up fastener 4, thereby the distance between bionical sawtooth 3 and blade 2 is adjustable, thereby change bionical sawtooth 3's tooth height, specifically, through rotating the cap, can drive the cap and break away from arc wall 11, thereby conveniently slide in spout 9 through removal axle 10, adjust the distance at the both ends of fork arm subassembly 6 homonymy and the holistic position of fork arm subassembly 6, slide in spout 9 through the both ends of fork arm subassembly 6, thereby can change the interval between the intersection department of fork arm subassembly 6, and change for the equidistance, thereby drive bionical sawtooth 3 and change the interval, when fork arm subassembly 6 deformation, the fork arm subassembly 6 drives bionical sawtooth 3 and removes, through connecting rod 12 conflict through-hole inner wall, thereby make bionical sawtooth 3 can remove along connecting rod 12's length direction, and then play the guide effect to bionical sawtooth 3's removal, keep bionical sawtooth 3 along blade 2's rotation direction setting, remove in guide way 14 through location axle 13, thereby play the guide effect to the deformation of fork arm subassembly 6, and then make the process deformation of fork arm subassembly 6 more steady.
Then realize fixing through fastener 4, specifically, make its embedding arc wall 11 in through rotating the cap, can fix cap and remove axle 10, and then conveniently keep cutting fork arm assembly 6's state, then through covering apron 8 and with apron 8 and blade 2 bolt, can seal cavity 7 to keep the level and smooth of blade 2 surface.
The distance between the bionic saw teeth 3 is changed through the equidistant change mechanism, and the distance is changed, in the process of changing the distance, the equidistant change between the adjacent bionic saw teeth 3 is convenient for adjusting the distance between the bionic saw teeth 3, and the adjusted precision is kept, through changing the distance and the tooth height of the bionic saw teeth 3, the fan can keep the best noise reduction effect under different rotating speeds, the practicability of the fan is improved, the guide surface 15 can enable the tail edge of the blade 2 and the bionic saw teeth 3 to smoothly transition, thereby enabling the airflow to flow to the bionic saw teeth 3 along the guide surface 15, reducing the generation and the falling of vortex, improving the noise reduction effect of the fan, the arc convex strips 21 and the non-smooth surface can enable the airflow which relatively moves with the blade 2 to change the direction, thereby generating the normal micro vibration which is beneficial to reducing the tangential adhesion, the interface of the blade 2 is discontinuously distributed, so that generated noise is reduced, the static pressure distribution of the surface of the blade 2 is changed by the arrangement of the airflow holes 22, the static pressure at the middle position of the blade 2 is smaller than that of the blade top and the blade root, low-energy fluid at the end walls of the two ends flows to the middle of the blade 2 under the action of pressure difference, so that energy loss caused by accumulation of the low-energy fluid is reduced, vortex generation and falling can be slowed down, the fluid flowing state is more stable, the noise reduction effect is achieved, the sound absorption holes 20 can effectively conduct noise into the thick centrifugal glass wool layer 17, the fibers in the thick centrifugal glass wool layer 17 can have good noise reduction effect, the connecting strength between the outer layer 19 and the thick centrifugal glass wool layer 17 can be improved by the damping layer 18, and the service life of the air duct 1 is prolonged.
The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above examples, and all technical solutions belonging to the concept of the present invention belong to the protection scope of the present invention. It should be noted that modifications and adaptations to the present invention may occur to one skilled in the art without departing from the principles of the present invention and are intended to be within the scope of the present invention.
Claims (8)
1. A low noise axial fan, characterized in that: including dryer (1) and fan impeller, fan impeller includes a plurality of blades (2), the trailing edge swing joint of blade (2) has a plurality of bionic sawtooth (3), bionic sawtooth (3) are along the relative blade (2) slip setting of tooth height direction of bionic sawtooth (3) and realize fixedly through fastener (4), a plurality of bionic sawtooth (3) are realized a plurality of bionic sawtooth (3) interval synchronous change through interval equidistance change mechanism, the inwards sunken appearance chamber (5) that is formed of blade (2) trailing edge, interval equidistance change mechanism includes a pair of fork arm subassembly (6) that cuts, the intersection department at fork arm subassembly (6) is installed to bionic sawtooth (3), cavity (7) have been seted up to the lateral wall of blade (2), cavity (7) are opened and shut through apron (8), spout (9) with appearance chamber (5) intercommunication are seted up to the bottom surface of cavity (7), the both ends of fork arm subassembly (6) homonymy all slide connection in spout (9) and are fixed through fastener (4), the both ends that are connected with the equal axle (10) of fork arm subassembly (6) are connected with both sides of moving the equal to form the arc groove (10) and are connected with the equal-axis (10), the rotating cap is embedded into two arc-shaped grooves (11) which are symmetrically arranged and used for fixing the movable shaft (10).
2. The low noise axial flow fan according to claim 1, wherein: through holes communicated with two sides of the bionic saw tooth are formed in the bionic saw tooth (3), the same connecting rod (12) is installed in a plurality of through holes, and two ends of the connecting rod (12) respectively abut against two inner side walls of the containing cavity (5).
3. The low noise axial flow fan according to claim 1, wherein: the cross points of the scissor arm assemblies (6) are fixedly connected with positioning shafts (13), and guide grooves (14) which are arranged in a groined shape and used for accommodating movement of the positioning shafts (13) are formed in the inner wall of the accommodating cavity (5).
4. The low noise axial flow fan according to claim 1, wherein: the tail edge of the blade (2) is converged towards the center to form a guide surface (15), and the edge of the guide surface (15) is abutted against the bionic saw tooth (3) to realize smooth transition between the bionic saw tooth (3) and the blade (2).
5. The low noise axial flow fan according to claim 1, wherein: the air duct (1) sequentially comprises an inner layer (16), a thick centrifugal glass cotton layer (17), a damping layer (18) and an outer layer (19) from inside to outside, wherein a plurality of sound absorption holes (20) distributed in an array are formed in the inner layer (16).
6. The low noise axial flow fan according to claim 1, wherein: the fan is characterized in that the blades (2) are integrally formed with arc convex strips (21) taking the fan impeller as the center of a circle, and the surfaces of the blades (2) are non-smooth surfaces.
7. The low noise axial flow fan according to claim 1, wherein: the blade (2) is bent along the circumferential direction of the gravity center stacking line, a plurality of air flow holes (22) which are obliquely arranged are formed in the blade (2), and the first row of air flow holes (22) are distributed in front of the separation point of the boundary layer of the blade (2).
8. A method for using a low noise axial flow fan, applied to the low noise axial flow fan of claim 1, characterized in that: the method comprises the following steps: s1, opening a cover plate (8), and rotating the rotary cap to separate from the arc-shaped groove (11); s2, changing the interval between two movable shafts (10), and adjusting a plurality of bionic saw teeth (3) to move and keep equidistant arrangement through a scissor arm assembly (6); s3, moving the two moving shafts (10) to move in the sliding groove (9) to drive the scissor arm assembly (6) and the bionic saw teeth (3) to move, and changing the tooth height of the bionic saw teeth (3); s4, rotating the rotary cap to enable the rotary cap to be embedded into the arc-shaped groove (11), and covering the cover plate (8).
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| CN202210420434.1A CN114738319B (en) | 2022-04-20 | 2022-04-20 | Low-noise axial flow fan and using method thereof |
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| CN202210420434.1A CN114738319B (en) | 2022-04-20 | 2022-04-20 | Low-noise axial flow fan and using method thereof |
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| CN114738319B true CN114738319B (en) | 2023-11-14 |
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