CN115111176A - Low-pitch noise reduction fan - Google Patents

Low-pitch noise reduction fan Download PDF

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Publication number
CN115111176A
CN115111176A CN202210756778.XA CN202210756778A CN115111176A CN 115111176 A CN115111176 A CN 115111176A CN 202210756778 A CN202210756778 A CN 202210756778A CN 115111176 A CN115111176 A CN 115111176A
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CN
China
Prior art keywords
silencing
air
air inlet
noise reduction
pipe
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Granted
Application number
CN202210756778.XA
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Chinese (zh)
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CN115111176B (en
Inventor
王进
邱浩杰
孙庆华
李润豪
石超
邱召春
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Qingdao Leiting Heavy Industry Co Ltd
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Qingdao Leiting Heavy Industry Co Ltd
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Priority to CN202210756778.XA priority Critical patent/CN115111176B/en
Publication of CN115111176A publication Critical patent/CN115111176A/en
Application granted granted Critical
Publication of CN115111176B publication Critical patent/CN115111176B/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D25/00—Pumping installations or systems
    • F04D25/02—Units comprising pumps and their driving means
    • F04D25/08—Units comprising pumps and their driving means the working fluid being air, e.g. for ventilation
    • 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
    • F04D29/522—Casings; Connections of working fluid for axial pumps especially 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
    • F04D29/40—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
    • 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
    • F04D29/667—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
    • 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
    • F04D29/668—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps damping or preventing mechanical vibrations
    • 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
    • F04D29/70—Suction grids; Strainers; Dust separation; Cleaning
    • F04D29/701—Suction grids; Strainers; Dust separation; Cleaning especially adapted for elastic fluid pumps
    • F04D29/703—Suction grids; Strainers; Dust separation; Cleaning especially adapted for elastic fluid pumps specially for fans, e.g. fan guards
    • 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 bass noise reduction fan, which comprises an air duct and a driving mechanism arranged in the air duct and used for generating wind power, wherein the driving mechanism comprises fan blades and a driving motor used for driving the fan blades to rotate; the air outlet end of the air duct is provided with a silencing device, the silencing device comprises a silencing barrel and a silencing pipe which are coaxially arranged, two ends of the silencing barrel are sealed, the silencing barrel is sleeved on the silencing pipe, and two ends of the silencing pipe penetrate through the silencing barrel; a plurality of guide plates are arranged in the silencing pipe, are spirally distributed around the axis of the silencing pipe, and are provided with a plurality of through holes for air to flow through; according to the scheme, the noise eliminator is arranged at the air outlet of the air duct, so that the generation and transmission of noise are reduced when air is exhausted, and the noise of the whole fan is reduced; the air inlet cover is arranged at the air inlet of the air duct, and the silencing cotton is covered in the air inlet cover, so that the generation and the transmission of noise are further reduced.

Description

Low-pitch noise reduction fan
Technical Field
The invention relates to the technical field of fan noise reduction, in particular to a low-pitch noise reduction fan.
Background
The fan is a mechanical device which can increase gas pressure and discharge gas by inputting mechanical energy, and is widely applied to industrial departments such as chemical industry, petroleum, metallurgy, mine, machinery and the like and some civil departments; in the prior art, an axial flow fan generally comprises a mounting base, a motor and fan blades, the fan blades are driven to rotate by the motor to drive air to circulate, and the direction of air flow is the same as the axial direction of the fan blades.
Refer to the Chinese utility model with patent application No. CN202021655926.1, which discloses an energy-saving axial flow fan, comprising an energy-saving axial flow fan shell and an axial flow fan installed in the energy-saving axial flow fan shell, wherein the port of the energy-saving axial flow fan shell is provided with a net frame and a protective frame, a dust screen is arranged in the net frame, an inner extension ring is integrally formed on the inner wall of the energy-saving axial flow fan shell near the net frame, a projection is integrally formed on the outer part of the protective frame, the dust screen in the net frame can effectively isolate the outer dust through the net frame arranged between the energy-saving axial flow fan shell and the inner groove, and the dust screen can prevent the dust from entering the energy-saving axial flow fan shell, meanwhile, the inner groove arranged on the outer wall of the energy-saving axial flow fan shell and the handle bar formed on the inner groove, and the anti-skid veins distributed on the surface of the energy-saving axial flow fan shell facilitate the normal carrying or transportation of the fan by personnel, the efficient and stable utilization operation of the energy-saving axial flow fan is ensured.
With respect to the related art among the above, the inventors consider that the following drawbacks exist: in the process of starting and running the axial flow fan, airflow rapidly flows in a fan shell and collides and rubs with the fan wall to generate a large amount of noise, and the rotation of fan blades and the airflow also collide and rub to generate noise.
Disclosure of Invention
The invention aims to solve the problem that the noise is too high and cannot be effectively solved in the using and running process of a fan in the prior art, and provides a low-pitch noise reduction fan.A silencing device is arranged at an air outlet of a fan air duct, so that the generation and transmission of noise are reduced in the process of discharging air flow, and the noise of the whole fan is further reduced; in addition, an air inlet cover is arranged at the air inlet of the fan air cylinder, and the inner wall of the air inlet cover is covered with silencing cotton, so that when air flow enters the air cylinder through the air inlet cover, sound absorption treatment can be performed in advance, and the generation and transmission of noise are further reduced.
The technical scheme of the invention is as follows:
a low-pitch noise reduction fan comprises an air duct and a driving mechanism arranged in the air duct and used for generating wind power, wherein the driving mechanism comprises fan blades and a driving motor used for driving the fan blades to rotate; a silencing device is mounted at the air outlet end of the air duct and comprises a silencing barrel and a silencing pipe which are coaxially arranged, the silencing barrel is sleeved on the silencing pipe, two ends of the silencing barrel are sealed, and two ends of the silencing pipe penetrate through the silencing barrel; the silencer is characterized in that a plurality of guide plates are arranged in the silencer pipe, the guide plates are spirally distributed around the axis of the silencer pipe, a curved channel for air circulation is formed between the guide plates and the wall of the silencer barrel, and a plurality of through holes for air to flow through are formed in the guide plates.
Preferably, a guide cone coaxial with the silencing pipe is arranged in the air inlet end of the silencing pipe, the cone top of the guide cone faces the driving motor, the cone bottom of the guide cone is fixed on the end face of one side of the guide plate, and the maximum diameter of the cone bottom of the guide cone is smaller than the inner diameter of the silencing pipe.
Preferably, the joint of the silencing pipe and the silencing barrel is provided with a sealing gasket, the sealing gasket covers the inner wall of the silencing barrel, a cavity is formed between the sealing gasket and the outer wall of the silencing pipe together, and porous foam is filled in the cavity.
Preferably, one end of the air inlet cover is fixedly connected to the air inlet end of the air duct, the other end of the air inlet cover is provided with a noise reduction plate, the noise reduction plate covers the end part of the air inlet cover, and the noise reduction plate is provided with a plurality of air inlet holes for gas circulation.
Preferably, still be provided with the filter screen in the air inlet cover inner chamber, the filter screen is coaxial setting with air inlet cover and the board of making an uproar that falls, and the filter screen is fixed on the inner wall of air inlet cover.
Preferably, a vacuum cavity is formed in the wall of the air duct, and the vacuum cavity surrounds the driving mechanism; the outer wall of the air duct is also provided with a vacuum pump, and the vacuum pump is connected with the vacuum cavity through a connecting pipe.
The invention has the beneficial effects that:
according to the bass noise reduction fan provided by the invention, the noise eliminator is arranged at the air outlet of the fan air duct, so that the generation and transmission of noise are reduced in the process of discharging air flow, and the noise of the whole fan is further reduced; in a silencing pipe in a sound device, a plurality of guide plates which are distributed in a spiral circumferential manner are arranged, and through holes are formed in the guide plates, so that air flow entering the silencing device flows along the guide plates and is denoised through the through holes in the backflow plate; in addition, the air inlet cover is arranged at the air inlet of the fan air cylinder, and the inner wall of the air inlet cover is covered with the silencing cotton, so that when air flow enters the air cylinder through the air inlet cover, sound absorption treatment can be performed in advance, and the generation and transmission of noise are further reduced; in addition, through set up buffer gear between fan dryer and base, can avoid the vibrations of fan directly to transmit to base and subaerial, reduce resonance and produce, prevent the propagation of vibrations source to further play and reduce the produced noise of vibrations.
Drawings
Fig. 1 is a schematic view of an overall structure of a bass noise reduction fan provided by the present invention;
FIG. 2 is a schematic cross-sectional view of a low-pitch noise reduction fan according to the present invention;
FIG. 3 is a schematic cross-sectional view of a silencer duct according to the present invention;
FIG. 4 is a first perspective view of the silencer according to the present invention;
FIG. 5 is a schematic perspective view of a silencer according to the present invention;
FIG. 6 is a first schematic view of a baffle structure provided by the present invention;
FIG. 7 is a schematic view of a second embodiment of a baffle structure according to the present invention;
FIG. 8 is a schematic diagram of a noise reduction plate structure according to the present invention;
in the figure, 1, an air duct; 101. a mounting frame; 102. a vacuum chamber; 103. a connecting pipe; 106. a reinforcing plate; 2. a base; 201. a support cylinder; 3. a buffer mechanism; 301. a telescopic rod; 302. a spring; 303. a rubber damper block; 4. an air inlet cover; 401. a noise reduction plate; 402. sound-absorbing cotton; 403. filtering with a screen; 404. an air inlet hole; 5. a muffler device; 501. a silencing barrel; 502. a silencing tube; 503. a gasket; 504. a cavity; 6. a vacuum pump; 701. a drive motor; 702. a fan blade; 703. a dust cover; 8. and (4) bolts.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly understood, the present invention is further described below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and do not limit the invention.
It is to be understood that the terms "horizontal, vertical, oblique, top, bottom, side, two sides, above, below, symmetrical" and the like are used herein to indicate orientations and positional relationships based on those shown in the drawings, and are used merely for convenience in describing and simplifying the present invention, and do not indicate or imply that the device or component being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention.
Referring to fig. 1 to 8, the invention provides a bass noise reduction fan, which includes an air duct 1 and a driving mechanism installed in the air duct 1 for generating air flow, wherein the driving mechanism includes a fan blade 702 and a driving motor 701, a central line of the fan blade 702 and an axis of the air duct 1 are coaxially arranged, the driving motor 701 is fixed on a mounting rack 101 in the air duct 1, and the mounting rack 101 is fixed on an inner wall of the air duct 1; the fan blades 702 are driven to rotate by the driving motor 701 to form air flow and convey air; in addition, an air inlet cover 4 is arranged at an air inlet port of the air duct 1, the air inlet cover 4 is of a horn-shaped structure, a small end of the air inlet cover is fixedly arranged on the air duct 1 through a bolt 8, and the outer contour of the small end of the air inlet cover 4 is matched with the air duct 1, so that the air inlet cover 4 and the air duct 1 can be tightly connected, and the phenomenon of air leakage caused by gaps is avoided; sound absorption cotton 402 covering the whole inner wall of the air inlet cover 4 is laid on the inner wall of the air inlet cover 4, and preliminary sound absorption and noise reduction treatment is carried out on the air flow entering the air inlet cover 4 by arranging the sound absorption cotton 402; in addition, a silencing device 5 is arranged at an air outlet of the air duct 1, and the silencing device 5 is used for silencing and denoising air flow in the air duct 1 to be exhausted, so that noise generated by the fan during operation is further reduced; it should be noted that the silencing device 5 includes a silencing barrel 501 and a silencing tube 502 coaxially disposed with the silencing barrel 501, wherein, in the specific embodiment of the present invention, the silencing barrel 501 is a horn-shaped structure with two sealed ends, the large end of the silencing barrel 501 is fixedly mounted at the air outlet port of the air duct 1 through a bolt 8, and the outline of the large end of the silencing barrel 501 is matched with the air duct 1, so that the silencing barrel 501 and the air duct 1 are tightly mounted and matched, and noise caused by gap is avoided when air flows pass; two ends of the silencing pipe 502 penetrate through the sealing end faces on two sides of the silencing barrel 501 respectively, so that air flow generated by the driving mechanism can be discharged from the integral fan after passing through the silencing pipe 502; it should be further noted that a plurality of guide plates 505 are arranged in the pipe of the silencing pipe 502, the guide plates 505 are spirally distributed around the axis of the silencing pipe 502, the side wall of each guide plate 505 is fixed on the inner wall of the silencing pipe 502, so that a channel for air flow to pass through is formed between each guide plate 505 and the inner wall of the silencing pipe 502; the plate surface of each guide plate 505 is provided with a plurality of uniformly distributed through holes 506, the through holes 506 are used for air flow to pass through, the guide plate 505 is designed in a spiral shape, and the guide plate 505 is provided with the through holes 506, so that the air flow entering the silencing pipe 502 must pass through the through holes 506 in the process of moving along the guide plate 505, the resonance between the air flow and the silencing pipe 502 is changed, a good silencing effect is achieved, and the noise is greatly reduced; further, in another embodiment of the present invention, the spiral degree of the plurality of guide plates 505 can be adjusted according to the maximum power of the driving motor 701, when the maximum power of the driving motor 701 is larger, the rotating speed of the fan blade 702 is driven to rotate faster, the generated air flow and pressure are larger, at this time, the spiral degree of the plurality of guide plates 505 is increased, the flowing length of the air flow and the number of the through holes 506 passing through are increased, so as to perform noise reduction and silencing on the air flow; if the maximum power of the driving motor 701 is small, the rotating speed of the fan blades 702 is driven to rotate slowly, the generated air flow and pressure are small, and the spiral degree of the guide plates 505 can be properly reduced, so that the requirements of noise reduction and noise reduction on the air flow can be met.
Referring to fig. 3 to 7, in an embodiment of the present invention, a flow guiding cone 507 is disposed in an air inlet of the muffling pipe 502, the flow guiding cone 507 is in a conical structure, a top of the flow guiding cone is toward the driving motor 701, and a bottom of the flow guiding cone is fixed on end surfaces of the plurality of flow guiding plates 505; in addition, the guide cone 507 is arranged coaxially with the silencing pipe 502, and the maximum diameter of the profile of the guide cone 507 is smaller than the inner diameter of the silencing pipe 502; by arranging the flow guide cone 507, air entering the silencing pipe 502 is divided in advance, so that air flow can enter a channel formed between the flow guide plate 505 and the inner wall of the silencing pipe 502 more smoothly, and the generation of friction noise caused by excessive contact between the air flow and the end face of the flow guide plate 505 is avoided.
Referring to fig. 2, in an embodiment of the present invention, a sealing gasket 503 is disposed at a connection position of the silencing tube 502 and the silencing pot 501, and a gap at the connection position of the silencing tube 502 and the silencing pot 501 is sealed by the sealing gasket 503, so that an air flow is prevented from entering the interior of the silencing pot 501 through the gap, and noise generated when the air flow passes through the gap is also prevented; in addition, the sealing gasket 503 covers the inner wall of the silencing pot 501, and the sealing gasket 503 and the outer wall of the silencing pipe 502 together enclose a cavity 504, and the cavity 504 is filled with porous foam; through setting up cavity 504, on the one hand reduce the area of contact of noise tube 502 and noise damping section of thick bamboo 501, block the route that sound propagated between fixed, on the other hand, through filling porous foam in cavity 504, make some noise that propagates through noise tube 502 solid absorbed when the porous foam of process, further the separation absorption of carrying on to the noise avoids the noise transmission.
Referring to fig. 2 and 8, in an embodiment of the present invention, a noise reduction plate 401 is disposed at the large end of the air inlet cover 4, the noise reduction plate 401 is fixedly mounted at the port of the air inlet cover 4 through a bolt 8, and the profile of the noise reduction plate 401 matches with the large end of the air inlet cover 4, so that the noise reduction plate 401 covers the port of the air inlet cover 4; in addition, a plurality of air inlet holes 404 are uniformly distributed on the surface of the noise reduction plate 401, air enters the air inlet cover 4 through the air inlet holes 404, and when air flow passes through the air inlet holes 404, the pressure and the flow speed of the air flow are reduced, so that the noise is reduced.
Further, as shown in fig. 2, a filter screen 403 is further disposed in an inner cavity of the air inlet cover 4, the filter screen 403, the air inlet cover 4 and the noise reduction plate 401 are coaxially disposed, the filter screen 403 covers the inside of the air inlet cover 4 and is fixed on an inner wall of the air inlet cover 4, by disposing the filter screen 403, air entering the air inlet cover 4 and the air duct 1 is filtered, so that dust and impurities in the air are prevented from polluting the driving motor 701 and fan blades, and meanwhile, the dust and impurities are also prevented from entering the noise reduction pipe 502 after passing through the air duct 1 to affect the noise reduction effect of the noise reduction pipe 502.
Referring to fig. 2, in the embodiment of the present invention, a vacuum chamber 102 is disposed in the wall of the air duct 1, the vacuum chamber 102 is disposed around the axis of the air duct 1, and the contour dimension of the vacuum chamber 102 is larger than the contour dimension of the driving mechanism, so that the driving mechanism is surrounded by the vacuum chamber 102; in addition, a vacuum pump 6 is fixed on the outer wall of the air duct 1, the vacuum pump 6 is connected with the vacuum cavity 102 through a connecting pipe 103, one end of the connecting pipe 103 is fixed on the vacuum pump 6, and the other end of the connecting pipe penetrates through the wall of the air duct 1 and then extends into the vacuum cavity 102; through setting up vacuum pump 6, extract the gas in vacuum cavity 102 when the fan uses, be in the vacuum state in messenger vacuum cavity 102, do not have the medium in the vacuum and make sound unable transmission, and then realize reducing the effect of fan noise.
Further, referring to fig. 1 and 2, in a specific embodiment of the present invention, a base 2 for fixing a position of the air duct 1 is disposed below the air duct 1, two vertically disposed support cylinders 201 are fixed on a top surface of the base 2, and a buffer mechanism 3 is disposed between the support cylinders 201 and the air duct 1, wherein the buffer mechanism 3 includes a telescopic rod 301 and a rubber damper 303, the rubber damper 303 is disposed between the support cylinders 201 and the air duct 1, and the rubber damper 303 is disposed coaxially with the support cylinders 201, a bottom end of the rubber damper 303 is fixed on a top surface of the support cylinders 201, a top end of the rubber damper 303 is fixed on a reinforcing plate 106 on the air duct 1, and the rubber damper 303 is disposed to slow down vibration transmission between the air duct 1 and the base 2, so as to avoid noise; in addition, set up the through hole that is used for telescopic link 301 to pass through in rubber snubber block 303, the vertical setting of telescopic link 301 is in support sleeve 201, the bottom of telescopic link 301 is fixed on base 2, the top of telescopic link 301 stretches into in rubber snubber block 303 and fixes on reinforcing plate 106, and still the cover is equipped with spring 302 on telescopic link 301, spring 302's both ends respectively with base 2 and the surperficial looks butt of reinforcing that 106, through setting up telescopic link 301 and spring 302, further carry out the bradyseism to dryer 1, avoid the vibrations of fan directly to transmit to base 2 and subaerial, reduce resonance and produce, prevent the propagation in vibrations source, thereby play and reduce the produced noise of vibrations.
The working process and principle of the invention are as follows:
when the air inlet hood is used, the air inlet hood 4 and the silencing device 5 are fixedly installed on the air duct 1 through the bolts 8, the air inlet hood 4 is installed at the air inlet port of the air duct 1, the silencing device 5 is located at the air outlet port of the air duct 1, then the driving motor 701 and the vacuum pump 6 are started simultaneously through the starting switch, after the vacuum pump 6 is started, gas in the vacuum cavity 102 is extracted, the inside of the vacuum cavity 102 is kept in a vacuum state, the driving motor 701 drives the fan blades 702 to rotate, when air flow enters the air inlet hood 4, the air flow is subjected to primary noise reduction through the noise reduction plate 401 on the air inlet hood 4, then after the air flow enters the air inlet hood 4, the noise reduction treatment is performed again through the sound absorption cotton 402 arranged on the inner wall of the air inlet hood 4, and then the generation of noise is reduced before the air flow enters the air duct 1; after the air flow enters the air duct 1, noise is generated due to collision between the fan blades 702 and the air flow in the operation process, and the noise transmission is blocked through the vacuum cavity 102 on the wall of the air duct 1, so that the effect of reducing the noise is achieved; when the air current enters the muffling pipe 502 of the muffling device 5 after passing through the air duct 1, the air current is divided by the flow guiding cone 507, so that the air current can uniformly and smoothly enter a channel defined by the flow guiding plate 505 and the muffling pipe 2, and the generation of friction noise caused by excessive contact between the air current and the side end face of the flow guiding plate 505 is avoided, and the resonance of the air current is slowed down through the through holes 506 on the flow guiding plate 505, so as to reduce the generation of noise.
The foregoing description of the specific embodiments of the present invention has been presented for the purposes of illustration and description and is not intended to limit the invention to the precise form disclosed, and obviously many modifications and variations are possible in light of the above teaching, the examples having been selected and described for the purpose of illustrating the particular principles of the invention and the practical application, thereby enabling others skilled in the art to make and use various embodiments of the invention and various alternatives and modifications. It is intended that the scope of the invention be defined by the claims and their equivalents.

Claims (6)

1. A low-pitch noise reduction fan comprises an air duct (1) and a driving mechanism which is arranged in the air duct (1) and used for generating wind power, wherein the driving mechanism comprises fan blades (702) and a driving motor (701) used for driving the fan blades (702) to rotate, and the low-pitch noise reduction fan is characterized in that an air inlet cover (4) is arranged at an air inlet end of the air duct (1), and sound absorption cotton (402) is paved on the inner wall of the air inlet cover (4); a silencing device (5) is mounted at an air outlet end of the air duct (1), the silencing device (5) comprises a silencing barrel (501) and a silencing pipe (502) which are coaxially arranged, the silencing barrel (501) is sleeved on the silencing pipe (502), two ends of the silencing barrel (501) are sealed, and two ends of the silencing pipe (502) penetrate through the silencing barrel (501); a plurality of guide plates (505) are arranged in the silencing pipe (502), the plurality of guide plates (505) are spirally distributed around the axis of the silencing pipe (502), curved channels for air circulation are formed between the guide plates and the wall of the silencing pipe (501), and a plurality of through holes (506) for air to flow through are formed in the guide plates (505).
2. The bass noise reduction fan according to claim 1, wherein a guide cone (507) coaxial with the sound-deadening pipe (502) is arranged in the air inlet port of the sound-deadening pipe (502), the top of the guide cone (507) faces the driving motor (701), the bottom of the guide cone (507) is fixed on the side end face of the guide plate (505), and the maximum diameter of the bottom of the guide cone (507) is smaller than the inner diameter of the sound-deadening pipe (502).
3. The bass noise reduction fan according to claim 2, wherein a sealing gasket (503) is arranged at the joint of the silencing tube (502) and the silencing tube (501), the sealing gasket (503) covers the inner wall of the silencing tube (501), a cavity (504) is formed between the sealing gasket (503) and the outer wall of the silencing tube (502), and porous foam is filled in the cavity (504).
4. The bass noise reduction fan according to claim 1, wherein one end of the air inlet cover (4) is fixedly connected to the air inlet end of the air duct (1), the other end of the air inlet cover (4) is provided with a noise reduction plate (401), the noise reduction plate (401) covers the end of the air inlet cover (4), and a plurality of air inlet holes (404) for air circulation are formed in the noise reduction plate (401).
5. The bass noise reduction fan according to claim 4, wherein a filter screen (403) is further disposed in the inner cavity of the air inlet cover (4), the filter screen (403) is disposed coaxially with the air inlet cover (4) and the noise reduction plate (401), and the filter screen (403) is fixed on the inner wall of the air inlet cover (4).
6. The bass noise reduction fan according to claim 1, wherein a vacuum chamber (102) is formed in a wall of the air duct (1), and the vacuum chamber (102) is disposed around the driving mechanism; the outer wall of the air duct (1) is further provided with a vacuum pump (6), and the vacuum pump (6) is connected with the vacuum cavity (102) through a connecting pipe (103).
CN202210756778.XA 2022-06-30 2022-06-30 Bass noise reduction fan Active CN115111176B (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116517890A (en) * 2023-06-27 2023-08-01 平安电气股份有限公司 Ventilator adopting vacuum combined silencing structure
CN118188546A (en) * 2024-04-30 2024-06-14 广东铨达环保通风设备有限公司 Air circulation diversion fan and intelligent control system thereof

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KR20090060832A (en) * 2007-12-10 2009-06-15 한국항공우주연구원 Inducer with circulation flow pipe line
CN204458553U (en) * 2015-01-09 2015-07-08 国家电网公司 A kind of Multifunctional pneumatic power reclaiming type ventilation silencer
CN205805959U (en) * 2016-06-07 2016-12-14 山东华力机电有限公司 Noise reduction double-walled dust suppression fall haze air-assisted type spraying machine
CN208294797U (en) * 2018-03-25 2018-12-28 无锡市晋业航空安全设备有限公司 A kind of aviation helicopter low noise axial fan
CN212318393U (en) * 2020-05-23 2021-01-08 朱斌 Fan silencer with spiral chute
CN112628215A (en) * 2020-11-16 2021-04-09 宁波洲驰车业有限公司 Muffler that amortization nature is strong
CN215108988U (en) * 2020-09-27 2021-12-10 吴令 Mine is with falling formula of making an uproar ventilation unit
CN216381902U (en) * 2021-11-29 2022-04-26 武汉中瀚暖通空调设备有限公司 Low-noise energy-saving mixed-flow fan

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KR20090060832A (en) * 2007-12-10 2009-06-15 한국항공우주연구원 Inducer with circulation flow pipe line
CN204458553U (en) * 2015-01-09 2015-07-08 国家电网公司 A kind of Multifunctional pneumatic power reclaiming type ventilation silencer
CN205805959U (en) * 2016-06-07 2016-12-14 山东华力机电有限公司 Noise reduction double-walled dust suppression fall haze air-assisted type spraying machine
CN208294797U (en) * 2018-03-25 2018-12-28 无锡市晋业航空安全设备有限公司 A kind of aviation helicopter low noise axial fan
CN212318393U (en) * 2020-05-23 2021-01-08 朱斌 Fan silencer with spiral chute
CN215108988U (en) * 2020-09-27 2021-12-10 吴令 Mine is with falling formula of making an uproar ventilation unit
CN112628215A (en) * 2020-11-16 2021-04-09 宁波洲驰车业有限公司 Muffler that amortization nature is strong
CN216381902U (en) * 2021-11-29 2022-04-26 武汉中瀚暖通空调设备有限公司 Low-noise energy-saving mixed-flow fan

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116517890A (en) * 2023-06-27 2023-08-01 平安电气股份有限公司 Ventilator adopting vacuum combined silencing structure
CN118188546A (en) * 2024-04-30 2024-06-14 广东铨达环保通风设备有限公司 Air circulation diversion fan and intelligent control system thereof

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