Bionic vortex noise reduction centrifugal fan volute structure

Abstract

The utility model relates to the technical field of centrifugal fans, in particular to a bionic vortex noise reduction centrifugal fan volute structure which comprises a bionic vortex main volute, an air inlet is formed in one side of the bionic vortex main volute, and an air outlet is fixedly connected to one end of the bionic vortex main volute. A plurality of guide vanes are uniformly and fixedly connected to the surface of the inner wall of the air outlet, a fixing seat is fixedly connected to the other side of the bionic vortex main volute, a plurality of reinforcing ribs are uniformly and fixedly connected to the surface of the fixing seat, and a porous sound absorption material is pasted to the surface of the inner wall of the bionic vortex main volute; a plurality of spiral protrusions are fixedly connected to the two sides of the inner wall of the bionic vortex main volute, through the arrangement of the porous sound absorption material, the porous sound absorption material is made of porous foamed aluminum or glass wool or polyurethane foam in the using process, when noise is spread in the volute, part of the noise enters pores of the porous sound absorption material, and the sound absorption effect is improved. And sound energy is converted into heat energy through friction and viscosity effects, so that the noise intensity is attenuated.

Description

TECHNICAL FIELD

[0001] The utility model relates to centrifugal fan technical field, concretely relates to a bionic scroll noise reduction centrifugal fan volute structure. BACKGROUND

[0002] The centrifugal fan is according to the principle of kinetic energy conversion for potential energy, utilizes the high-speed rotating impeller to accelerate gas, then decelerates, changes flow direction, makes kinetic energy conversion into potential energy, in single-stage centrifugal fan, gas enters the impeller from the axial, gas changes into radial when passing through the impeller, then enters the diffuser, in the diffuser, gas changes flow direction and the pipe cross section area increases to make airflow decelerate, this deceleration effect converts kinetic energy into pressure energy, pressure increase mainly occurs in the impeller, secondarily occurs in the diffusing process.

[0003] The traditional volute usually adopts simple spiral or archimedes spiral shape, when the airflow produced by fan impeller rotation enters the volute, due to the sudden change and discontinuity of the internal flow passage of the volute, the airflow is easy to produce separation, vortex and other unstable flow phenomena, these unstable airflow and volute wall surface interact, form strong aerodynamic noise.

[0004] The inner wall of the traditional volute is relatively smooth, when noise is produced, is easy to reflect and propagate in the volute, forms reverberation effect, further amplifies noise intensity, and, the existing volute material often has limited noise absorption capacity, cannot effectively attenuate noise. SUMMARY

[0005] In view of the above-mentioned shortcomings of prior art, the utility model provides a bionic scroll noise reduction centrifugal fan volute structure, which can effectively solve the problems raised in the background art.

[0006] To achieve the above object, the utility model realizes by the following technical scheme:

[0007] The utility model provides a bionic scroll noise reduction centrifugal fan volute structure, which comprises: a bionic scroll main volute, an air inlet is formed on one side of the bionic scroll main volute, an air outlet is fixedly connected to one end of the bionic scroll main volute, a plurality of guide vanes are uniformly fixedly connected to the inner wall surface of the air outlet, a fixing seat is fixedly connected to the other side of the bionic scroll main volute, a plurality of reinforcing ribs are uniformly fixedly connected to the surface of the fixing seat, a porous sound-absorbing material is pasted to the inner wall surface of the bionic scroll main volute, and a plurality of spiral protrusions are fixedly connected to both sides of the inner wall surface of the bionic scroll main volute.

[0008] Further, the air outlet is designed in a gradually expanding manner, and the edge of the air inlet is designed in a round corner.

[0009] Further, the outer wall of the bionic vortex main volute is coated with a damping material, and the other end of the air outlet is fixedly connected with a connecting flange, and a plurality of first fixing holes are uniformly arranged on the surface of the connecting flange.

[0010] Further, the other side of the fixing seat is fixedly connected with a fixing flange, and a plurality of second fixing holes are uniformly arranged on the surface of the fixing flange.

[0011] Further, the other side of the fixing flange is fixedly connected with a motor, and the output end of the motor is connected with an impeller through a spline.

[0012] Further, the inner wall surface of the bionic vortex main volute is fixedly connected with a viscous layer, and the surface of the viscous layer is fixedly connected with the porous sound-absorbing material.

[0013] Compared with the prior art, the technical scheme has the following beneficial effects:

[0014] 1. The porous sound-absorbing material is made of porous aluminum foam, glass wool or polyurethane foam, has good sound absorption performance, and the thickness of the porous sound-absorbing material is selected according to the noise frequency characteristics of the fan, generally between 10-30mm, the porous structure of the porous sound-absorbing material can effectively absorb noise, when the noise propagates in the volute, a part of the noise will enter the pores of the porous sound-absorbing material, and the sound energy will be converted into heat energy through friction and viscous effect, thereby attenuating the noise intensity.

[0015] 2. The spiral protrusions are distributed on both sides of the inner wall of the bionic vortex main volute, the spiral protrusions simulate the microstructure on the surface of some insect wings, the height and spacing of the spiral protrusions are optimized according to the size and operating conditions of the fan, generally between 1-5mm in height and 5-20mm in spacing, when the airflow passes through the spiral protrusions, the spiral protrusions will induce small vortices, the vortices interact with the main flow, consume the energy of the airflow, thereby reducing the turbulence degree of the airflow and reducing the generation of noise.

[0016] 3. The air outlet is designed in a gradually expanding manner, and the expansion angle is optimized according to the flow rate and pressure requirements of the fan, generally between 5°-15°, this gradually expanding structure can gradually slow down the airflow flowing out of the volute, reduce the outlet velocity of the airflow, reduce the noise generated by high-speed injection of the airflow, and the inner wall surface of the air outlet is fixedly connected with a plurality of guide vanes, which can guide the airflow to flow out uniformly, further stabilize the airflow, reduce the fluctuation and vortex of the airflow, and thereby reduce the noise. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the description of the embodiments or the prior art. Obviously, the drawings described in the following are only some of the embodiments of the present application, and for those skilled in the art, other drawings can also be obtained from these drawings without creative labor.

[0018] Figure 1 It is a schematic diagram of the overall structure of the present application.

[0019] Figure 2 It is a schematic diagram of the cross-sectional first perspective structure of the present application.

[0020] Figure 3 It is a schematic diagram of the bionic scroll main volute structure of the present application.

[0021] Figure 4 It is a schematic diagram of the impeller structure of the present application.

[0022] Figure 5 It is a schematic diagram of the cross-sectional second perspective structure of the present application.

[0023] The numbers in the figure represent respectively:

[0024] 1, bionic scroll main volute; 101, air inlet; 2, air outlet; 201, guide vane; 3, connecting flange; 301, first fixing hole; 4, fixing seat; 401, reinforcing rib; 5, fixing flange; 501, second fixing hole; 6, motor; 7, impeller; 8, viscous layer; 9, porous sound-absorbing material; 10, spiral protrusion. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical scheme and advantages of the embodiments of the present application more clear, the following will combine the drawings in the embodiments of the present application to clearly and completely describe the technical scheme in the embodiments of the present application. Obviously, the described embodiments are some of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0026] The present application will be further described below in combination with the embodiments. Embodiment 1

[0027] Reference Figures 1-5For the first embodiment of the utility model discloses a kind of bionic scroll noise reduction centrifugal fan volute structure, comprising: bionic scroll main volute 1, the side of bionic scroll main volute 1 is equipped with air inlet 101, one end of bionic scroll main volute 1 is fixedly connected with air outlet 2, the inner wall surface of air outlet 2 is uniformly fixedly connected with several guide vanes 201, the other side of bionic scroll main volute 1 is fixedly connected with fixed seat 4, the surface of fixed seat 4 is uniformly fixedly connected with several reinforcing ribs 401, the inner wall surface of bionic scroll main volute 1 is pasted with porous sound-absorbing material 9, the both sides of the inner wall of bionic scroll main volute 1 are fixedly connected with several spiral protrusions 10.

[0028] By the setting of porous sound-absorbing material 9, porous sound-absorbing material 9 is made of porous aluminum foam, glass wool or polyurethane foam when in use, has good sound-absorbing performance, the thickness of porous sound-absorbing material 9 is selected according to the noise frequency characteristics of fan, generally between 10-30mm, the pore structure of porous sound-absorbing material 9 can effectively absorb noise, when noise propagates in volute, part of noise will enter the pores of porous sound-absorbing material 9, and sound energy is converted into heat energy through friction and viscous effect, so as to attenuate noise intensity. Embodiment 2

[0029] Refer to Figures 1-5 For the second embodiment of the utility model, which is different from the first embodiment:

[0030] Air outlet 2 adopts gradually expanding design, the edge of air inlet 101 adopts round angle design, the outer wall of bionic scroll main volute 1 is coated with damping material, the other end of air outlet 2 is fixedly connected with connecting flange 3, and the surface of connecting flange 3 is uniformly provided with a plurality of first fixing holes 301.

[0031] By the setting of air outlet 2, air outlet 2 adopts gradually expanding design when in use, and the expansion angle is optimized according to the flow and pressure requirements of fan, generally between 5°-15°, and the gradually expanding structure can gradually slow down the airflow flowing out of the volute, reduce the outlet velocity of airflow, reduce the noise generated by high-speed injection of airflow, and the inner wall surface of air outlet 2 is uniformly fixedly connected with several guide vanes 201, which can guide the airflow to flow out uniformly, further stabilize the airflow, reduce the fluctuation and vortex of airflow, and thus reduce the noise.

[0032] The other side of fixed seat 4 is fixedly connected with fixed flange 5, the surface of fixed flange 5 is uniformly provided with a plurality of second fixing holes 501, the other side of fixed flange 5 is fixedly connected with motor 6, the output end of motor 6 is connected with impeller 7 through spline, the inner wall surface of bionic scroll main volute 1 is fixedly connected with adhesive layer 8, and the surface of adhesive layer 8 is fixedly connected with porous sound-absorbing material 9.

[0033] Through the arrangement of the spiral protrusions 10, the spiral protrusions 10 are distributed on both sides of the inner wall of the bionic vortex main volute 1 during use, the spiral protrusions 10 imitate the microstructure on the surface of some insect wings, the height and spacing of the spiral protrusions 10 are optimized according to the size and operating condition of the fan, and the height is generally between 1-5mm and the spacing is generally between 5-20mm, when the airflow passes through the spiral protrusions 10, the spiral protrusions 10 can induce micro-vortices, the micro-vortices interact with the main flow, consume the energy of the airflow, and thus reduce the turbulence degree of the airflow and the generation of noise.

[0034] The rest of the structure is the same as that of example 1.

[0035] The working process of the utility model is as follows:

[0036] Firstly, the motor 6 drives the impeller 7 to rotate, the airflow enters the inside of the bionic vortex main volute 1 from the air inlet 101, the edge of the air inlet 101 is designed with a round corner, so that the air inlet is smoother, the outer wall of the bionic vortex main volute 1 is coated with a damping material, so that the noise of the shell vibration radiation is suppressed, the surface of the fixing seat 4 is uniformly connected with a plurality of reinforcing ribs 401, so that the rigidity is improved and the resonance noise is reduced, then the airflow is discharged through the air outlet 2, the air outlet 2 is designed with a gradual expansion type, and the expansion angle is optimized according to the flow and pressure requirements of the fan, generally between 5°-15°, the gradual expansion type structure can gradually reduce the airflow flowing out of the volute, reduce the outlet velocity of the airflow, reduce the noise generated by the high-speed injection of the airflow, and the inner wall surface of the air outlet 2 is uniformly connected with a plurality of guide vanes 201, which can guide the airflow to flow out uniformly, further stabilize the airflow, reduce the fluctuation and vortex of the airflow, and thus reduce the noise.

[0037] Secondly, through the arrangement of the porous sound-absorbing material 9, the porous sound-absorbing material 9 is made of porous aluminum foam, glass wool or polyurethane foam, has good sound-absorbing performance, the thickness of the porous sound-absorbing material 9 is selected according to the noise frequency characteristics of the fan, generally between 10-30mm, the pore structure of the porous sound-absorbing material 9 can effectively absorb noise, when the noise propagates in the volute, part of the noise will enter the pores of the porous sound-absorbing material 9, and the sound energy is converted into heat energy through friction and viscous effect, so as to attenuate the noise intensity.

[0038] Finally, through the setting of the spiral protrusions 10, the spiral protrusions 10 are distributed on both sides of the inner wall of the bionic vortex main volute 1 during use, the spiral protrusions 10 imitate the microstructure of the surface of some insect wings, the height and spacing of the spiral protrusions 10 are optimized according to the size and operating condition of the fan, and the height is generally between 1-5mm and the spacing is generally between 5-20mm; when the airflow passes through the spiral protrusions 10, the spiral protrusions 10 will induce micro vortexes, the vortexes interact with the main flow, consume the energy of the airflow, thereby reducing the turbulence degree of the airflow and reducing the generation of noise.

[0039] The above examples are only used to illustrate the technical solutions of the present application, but not to limit it; although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that the technical solutions recorded in the foregoing examples can still be modified, or some technical features can be replaced equivalently; and these modifications or replacements will not make the essence of the corresponding technical solutions deviate from the protection scope of the technical solutions of the embodiments of the present application.

Claims

1. A biomimetic scroll noise-reducing centrifugal fan volute structure, characterized in that, Include: Bionic scroll main volute (1), one side of the bionic scroll main volute (1) is provided with air inlet (101), one end of the bionic scroll main volute (1) is fixedly connected with air outlet (2), the inner wall surface of the air outlet (2) is uniformly fixedly connected with a plurality of guide vanes (201), the other side of the bionic scroll main volute (1) is fixedly connected with fixed seat (4), the surface of the fixed seat (4) is uniformly fixedly connected with a plurality of reinforcing ribs (401), the inner wall surface of the bionic scroll main volute (1) is pasted with porous sound-absorbing material (9), the both sides of the inner wall of the bionic scroll main volute (1) are fixedly connected with a plurality of spiral protrusions (10).

2. A biomimicry scroll noise reduction centrifugal fan volute structure according to claim 1, wherein, The air outlet (2) is designed in a gradually expanding manner, and the edge of the air inlet (101) is designed in a round corner.

3. A biomimicry scroll noise reduction centrifugal fan volute structure according to claim 1, wherein, The outer wall of the bionic scroll main volute (1) is coated with damping material, the other end of the air outlet (2) is fixedly connected with connecting flange (3), and the surface of the connecting flange (3) is uniformly provided with a plurality of first fixing holes (301).

4. A biomimicry scroll noise reduction centrifugal fan volute structure according to claim 1, wherein, The other side of the fixed seat (4) is fixedly connected with fixed flange (5), and the surface of the fixed flange (5) is uniformly provided with a plurality of second fixing holes (501).

5. A biomimicry scroll noise reduction centrifugal fan volute structure according to claim 4, wherein, The other side of the fixed flange (5) is fixedly connected with motor (6), and the output end of the motor (6) is connected with impeller (7) through spline.

6. A biomimicry scroll noise reducing centrifugal fan volute structure as claimed in claim 1, wherein, The inner wall surface of the bionic scroll main volute (1) is fixedly connected with adhesive layer (8), and the surface of the adhesive layer (8) is fixedly connected with porous sound-absorbing material (9).

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