CN119755110A - Low-noise multistage axial flow fan - Google Patents
Low-noise multistage axial flow fan Download PDFInfo
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- CN119755110A CN119755110A CN202510252452.7A CN202510252452A CN119755110A CN 119755110 A CN119755110 A CN 119755110A CN 202510252452 A CN202510252452 A CN 202510252452A CN 119755110 A CN119755110 A CN 119755110A
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- 230000000712 assembly Effects 0.000 claims abstract description 32
- 238000000429 assembly Methods 0.000 claims abstract description 32
- 239000012774 insulation material Substances 0.000 claims abstract description 29
- 239000000463 material Substances 0.000 claims description 15
- 238000013016 damping Methods 0.000 claims description 14
- 238000005192 partition Methods 0.000 claims 2
- 241000886569 Cyprogenia stegaria Species 0.000 abstract description 4
- 238000010586 diagram Methods 0.000 description 8
- 238000009413 insulation Methods 0.000 description 7
- 238000009434 installation Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 229920000742 Cotton Polymers 0.000 description 3
- 230000017525 heat dissipation Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000004089 microcirculation Effects 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
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Abstract
The invention discloses a low-noise multistage axial flow fan, which comprises a fan shell, a driving motor, a motor main shaft, an impeller assembly and guide vane assemblies, wherein the fan shell comprises an outer shell, an inner shell and a sound insulation material layer which are integrally installed, the inner shell is formed by assembling guide vane shells of all the guide vane assemblies, the driving motor and the motor main shaft are installed in the guide vane shells positioned in the middle, two ends of the motor main shaft penetrate through the guide vane inner shells, the motor main shaft is connected with all the impeller assemblies, an air inlet guide cover is installed on a first-stage impeller assembly, a guide vane cover plate is installed on a last-stage guide vane assembly, a continuous airflow channel is formed between each impeller assembly and the guide vane assembly, and the driving motor drives the motor main shaft and the impeller assembly to synchronously rotate so as to realize the axial outflow of air from an air inlet to an air outlet. Compared with a conventional fan, the fan provided by the invention is stable in operation, low in noise, long in service life, safe, energy-saving and high in efficiency.
Description
Technical Field
The invention relates to the field of low-noise fan design, in particular to a low-noise multistage axial flow fan.
Background
The fan is used as a power source and widely used in the fields of industry, civil use and the like. The structure of the multistage axial flow fan mainly comprises a shell, an impeller and guide vanes, wherein gas and a fan shaft flow in parallel at the outlet of the fan, and the multistage axial flow fan is suitable for occasions with higher gas flow requirements. The existing axial flow fan products have the problems of large operation noise, low efficiency and high maintenance cost due to imperfect size and structural design, and the performance of the existing axial flow fan products needs to be improved.
Disclosure of Invention
In order to solve the defects in the prior art, the invention provides the low-noise multistage axial flow fan which is stable in operation, low in noise and good in performance of long service life, safety, energy conservation and high in efficiency.
In order to achieve the above object, the present invention provides the following technical solutions:
The utility model provides a multistage axial fan of low noise, includes fan casing, driving motor, motor spindle, impeller subassembly and stator subassembly quantity are more than two, and impeller subassembly includes impeller casing and impeller blade, and the stator subassembly includes stator inner shell, stator blade and stator shell, the fan casing includes the shell body, inner shell and the sound insulation material layer of an organic whole installation, the shell body is assembled by the stator shell of each stator subassembly and is formed, driving motor and motor spindle are installed in the stator shell that is located the centre, motor spindle both ends run through each stator inner shell, and the motor spindle is connected with each impeller subassembly, installs the air intake kuppe on the one-level impeller subassembly, installs the stator apron on the last one-level stator subassembly, forms continuous air current passageway between each impeller subassembly and the stator subassembly, drives motor spindle, impeller subassembly synchronous rotation by driving motor, realizes the axial outflow of gas from the air intake to the air outlet.
The impeller assembly and the guide vane assembly are five, the impeller assembly is divided into a first-stage impeller, a second-stage impeller, a third-stage impeller, a fourth-stage impeller and a fifth-stage impeller, the guide vane assembly is divided into a first-stage guide vane, a second-stage guide vane, a third-stage guide vane, a fourth-stage guide vane and a fifth-stage guide vane, and each impeller assembly and each guide vane assembly are sequentially arranged along the length direction of a motor spindle.
The structure and the size of each blade of the impeller assembly are the same, the structure and the size of each blade of the guide vane assembly are the same, and the blades of the guide vane assembly are of C-shaped structures.
Preferably, the maximum diameter D=120-240 mm of the air inlet guide cover, the axial distance L=30-45 mm of the air inlet guide cover, the outer edge diameter D=240-360 mm of each impeller blade, the outer wall diameter d=120-240 mm of each impeller shell, the axial distance L=35-50 mm of each impeller shell, the number of blades of each impeller assembly is 5-20, the blade inlet angle beta 1 of each impeller blade is 20 degrees or less and less than 1 degrees or less and the blade outlet angle beta 2 of each impeller blade is 20 degrees or less and the angle beta 2 or less and 90 degrees, and the blade wrap angle theta of each impeller blade is 0 degrees or less and 90 degrees;
The diameter D=242-362 mm of the outer edge of each guide vane blade, the diameter d=120-240 mm of the outer wall of each guide vane inner shell, the axial distance L=100-130 mm of the guide vane inner shell of the motor, the axial distance L=40-60 mm of other guide vane inner shells, the number of guide vane blades of each guide vane assembly is 10-30, the blade inlet angle beta 1 of each guide vane blade is 100 degrees or more and less than or equal to beta 1 degrees or less than 170 degrees, the blade outlet angle beta 2 of each guide vane blade is 20 degrees or more and less than or equal to beta 2 degrees and less than or equal to 90 degrees, and the blade wrap angle theta of each guide vane blade is 0 degrees or less than or equal to theta and less than or equal to 90 degrees.
The motor main shaft is movably mounted in the bearing assembly, the bearing assembly comprises a deep groove ball bearing, a bearing end cover and a wave spring, the deep groove ball bearing is mounted in the middle of the inner shell of the guide vane in an embedded mode, the wave spring and the bearing end cover are mounted on two sides of the deep groove ball bearing, and the bearing end cover is fixed with the inner shell of the guide vane through a bolt assembly.
Guide vane connecting parts are formed on two sides of a guide vane outer shell of each guide vane assembly, adjacent guide vane outer shells are integrally fixed through bolt assemblies, a motor mounting part is arranged on a guide vane inner shell of the guide vane assembly for mounting a driving motor, and a bearing mounting part is arranged on the guide vane inner shell of the guide vane assembly for mounting a bearing assembly.
The end face round nut and the middle round nut are arranged on the motor main shaft, and the shaft sleeve group is arranged between the adjacent impeller assemblies and the adjacent guide vane assemblies on the motor main shaft, so that the positions of all parts on the main shaft are stable, and the operation efficiency of the device is improved.
Install annular shell layer on the shell body, outer baffle is transversely and vertically installed to shell body outer wall, sets up outer sound insulation material layer between shell body outer wall and the annular shell layer, install annular inner shell layer on the inner shell body, install interior sound insulation material layer between annular inner shell layer outer wall and the outer shell body inner wall, inner baffle is transversely installed to inner shell body outer wall, installs the damping material layer between inner shell body outer wall and the annular inner shell layer, and wherein sound insulation material adopts soundproof cotton, and damping material selects materials such as rubber, resin, makes casing stable in structure, reinforcing sound insulation effect.
Preferably, the thickness S of the annular outer shell layer is 0.5-2mm, the thickness S of the main body of the outer shell layer is 2-8mm, the length L of the outer shell layer is 460-690mm, the thickness S of the outer sound insulation material layer is 10-30mm, the length L of the outer sound insulation material layer is 455-670mm, the thickness S of the inner sound insulation material layer is 10-40mm, the length L of the inner sound insulation material layer is 455-670mm, the thickness S of the annular inner shell layer is 0.5-2mm, the thickness of the damping material layer is 10-30mm, the thickness S of the main body of the inner shell layer is 2-8mm, the length L of the inner shell layer is 460-675mm, and the diameter D of the inner wall of the inner shell layer is 242-362mm.
The utility model discloses a motor, including shell body, motor, outer shell body, terminal plate, bolt assembly, terminal plate, inner connecting ring, terminal plate and flange, the outer shell body bottom has the base, and two rings are installed at outer shell body top to install motor wiring mouth in the middle of the top, the inner connecting ring is installed to the inner shell body both sides, outer annular plate top, and the outer annular plate outside still is provided with the terminal plate disc, and the terminal plate disc passes through the bolt assembly and installs outer annular plate, inner connecting ring, an organic whole fixed with the inner shell body on the outer shell body, two terminal flange are still installed to outer shell body both sides, and the terminal flange passes through the bolt assembly and installs on the outer shell body and an organic whole fixed with terminal plate, inner shell body.
The invention has the following beneficial effects:
1. The two sound insulation layers and the damping material layer are arranged between the inner shell and the outer shell of the fan, so that the sound insulation effect is remarkably enhanced, the inner shell and the outer shell are made of thin-wall metal plates, the heat dissipation performance is good, the inner shell, the outer shell and the end face flange are integrally installed through the end face disc, the outer ring plate and the inner connecting ring, and the fan is firm in structure, safe and reliable;
2. The fan adopts modularized and integrated design, the inner shell is installed in a manner of assembling and fastening a plurality of guide vane shells, the impeller is installed in the shells of the guide vanes at the same level, the fan is more convenient to manufacture and assemble, the fan is compact in structure, small in size, attractive and durable, the number of the guide vanes and the impellers is set as required, parameters are optimized, and different product specifications and design requirements are met;
3. the invention adopts a mode of multiple impellers of a motor, reasonably uses the optimal interval of motor operation, has convenient control, reduces energy consumption and cost, reduces the total pressure shared by each stage of impellers of the multistage impellers when the total pressure and the flow rate of the fan are unchanged, reduces the circumferential speed of each stage of impellers, reduces the absolute speed in the fan, reduces the noise of the fan, and has reasonable structural design and high working efficiency;
4. the driving motor provided by the invention has a heat dissipation structure, a gap is formed between the adjacent impeller and the guide vane, an airflow channel is formed in the inner shell of the guide vane or an airflow hole is arranged in the inner shell of the guide vane, the pressure difference is formed on the air inlet side and the air outlet side of each stage of guide vane, and airflow microcirculation is formed in the fan, so that the heat dissipation of the motor, the bearing and other parts is facilitated, the service life is long, and the running noise is low;
5. According to the fan, the bearing is arranged on the guide vane, so that the stability of the motor for driving the main shaft to rotate is guaranteed, and the axial movement of the main shaft during operation is reduced, the noise is reduced, and the reliability is good in a mode of arranging the wave spring and configuring a plurality of pairs of round nuts.
Drawings
FIG. 1 is a front perspective view of a low noise multistage axial flow fan of the present invention;
FIG. 2 is a rear perspective view of a low noise multi-stage axial flow fan according to the present invention;
FIG. 3 is a cross-sectional view of a low noise multi-stage axial flow fan according to the present invention;
FIG. 4 is a block diagram of a blower of the present invention with an annular outer shell removed;
FIG. 5 is a diagram of the outer housing of the blower of the present invention;
FIG. 6 is a block diagram of the inner housing, impeller, and vanes of the fan of the present invention;
FIG. 7 is a block diagram of the inner housing of the fan of the present invention with the annular inner housing layer removed;
FIG. 8 is a cross-sectional view of an inner housing, impeller, and guide vanes of the fan of the present invention;
FIG. 9 is a block diagram of a five stage impeller and drive motor of the fan of the present invention;
FIG. 10 is a block diagram of a primary impeller of the fan of the present invention;
FIG. 11 is a block diagram of a primary vane (bearing vane) of the fan of the present invention;
FIG. 12 is a block diagram of a secondary guide vane (motor guide vane) of the fan of the present invention;
FIG. 13 is a graph comparing pressure curves of a blower of the present invention with a conventional blower;
In the figure, the rotor is characterized by comprising a 1-annular outer shell layer, a 2-base, a 3-end flange, a 4-hanging ring, a 5-motor wiring port, a 6-impeller assembly, a 7-guide vane assembly, a 8-outer shell, a 9-outer baffle plate, a 10-outer sound insulation material layer, a 11-step mounting surface, a 12-end disc, a 13-outer annular plate, a 14-inner shell, a 15-annular inner shell layer, a 16-inner baffle plate, a 17-damping material layer, a 18-inner annular ring, a 19-end round nut, a 20-deep groove ball bearing, a 21-bearing end cover, a 22-wave spring, a 23-middle round nut, a 24-driving motor, a 25-motor spindle, a 26-shaft sleeve group, a 30-end flange connection part, a 6 a-primary impeller, a 6 b-secondary impeller, a 6 c-tertiary impeller, a 6 d-quaternary impeller, a 6 e-quaternary impeller, a 60-air inlet guide vane, 61-impeller blades, 7a 7 b-secondary guide vane, 7 c-tertiary guide vane, a 7 d-quaternary guide vane, a 7 e-quaternary guide vane, a 70-quaternary guide vane, a motor-primary guide vane, a 70-outer shell, a motor guide vane, a 25-motor rotor, a 25-motor spindle, a 26-motor rotor, a 7-hub, a rotor hub, a 75-rotor, a rotor hub, a 75-rotor, an inner shell, a 75-hub, and a guide vane.
Detailed Description
The invention is further illustrated by the following examples in conjunction with the accompanying drawings:
As shown in fig. 1 to 4, the low-noise multistage axial flow fan provided by the invention comprises a fan shell, a driving motor 24, a motor main shaft 25, impeller assemblies 6 and guide vane assemblies 7, wherein the number of the impeller assemblies 6 and the guide vane assemblies 7 is more than two, the number of the driving motor 24 and the motor main shaft 25 is one, the impeller assemblies 6 comprise impeller shells and impeller blades 61, the guide vane assemblies 7 comprise guide vane inner shells 73, guide vane blades 72 and guide vane shells 70, the fan shell comprises an outer shell 8, an inner shell 14 and a sound insulation material layer which are integrally installed, the inner shell 14 is assembled by the guide vane shells 70 of each guide vane assembly 7, the driving motor 24 and the motor main shaft 25 are installed in the guide vane shells 70 positioned in the middle, two ends of the motor main shaft 25 penetrate through each guide vane inner shell 73, the motor main shaft 25 is connected with each impeller assembly 6, an air inlet guide vane 60 is installed on one-stage impeller assembly, a guide vane cover plate 76 is installed on the last-stage guide vane assembly, a continuous air flow channel is formed between each impeller assembly 6 and each guide vane assembly 7, and the driving motor main shaft 25 and the impeller assemblies 6 are driven by the driving motor 24 to synchronously rotate, and the air flows out from the guide vane shells 70 to realize horizontal axial air inlet and air outlet.
Specifically, as shown in fig. 9 to 12, the impeller assemblies 6 and the guide vane assemblies 7 are five, the impeller assemblies 6 are divided into a primary impeller 6a, a secondary impeller 6b, a tertiary impeller 6c, a quaternary impeller 6d and a penta-stage impeller 6e, the guide vane assemblies 7 are divided into a primary guide vane 7a, a secondary guide vane 7b, a tertiary guide vane 7c, a quaternary guide vane 7d and a penta-stage guide vane 7e, and the respective impeller assemblies 6 and guide vane assemblies 7 are sequentially arranged along the length direction of the motor main shaft 25.
Each blade structure and the size of impeller subassembly 6 are the same, each blade structure and the size of stator subassembly 7 are the same, and the blade of stator subassembly 7 is C shape structure, and impeller subassembly 6, the quantity of the blade of stator subassembly 7 set up as required, and impeller subassembly 6, the blade of stator subassembly 7 are prime number each other and crisscross the setting, have the clearance between adjacent impeller subassembly 6 and the stator subassembly 7, have airflow channel or set up the air current hole in stator inner shell 73, realize standardized preparation, reduce cost, and pleasing to the eye durable, work efficiency is high.
Bearing assemblies are arranged on the first-stage guide vane 7a assembly 7 positioned on the left side and the fourth-stage guide vane 7d assembly 7 positioned on the right side, and a motor main shaft 25 is movably arranged in the bearing assemblies, so that the supporting effect on the main shaft and the impeller assembly 6 arranged on the main shaft is enhanced.
As shown in fig. 3 and 8, the bearing assembly comprises a deep groove ball bearing 20, a bearing end cover 21 and a wave spring 22, the deep groove ball bearing 20 is embedded and installed in the middle of the guide vane inner shell 73, the wave spring 22 and the bearing end cover 21 are installed on two sides of the deep groove ball bearing 20, and the bearing end cover 21 is fixed with the guide vane inner shell 73 through a bolt assembly, so that the installation is convenient, stable and reliable.
As shown in fig. 11 and 12, the vane outer shells 70 of the vane assemblies 7 are formed with vane connecting portions 71 on both sides, adjacent vane outer shells 70 are integrally fixed by bolt assemblies, the vane assembly 7 for mounting the driving motor 24 is provided with a motor mounting portion 75 on the vane inner shell 73, and the vane assembly 7 for mounting the bearing assembly is provided with a bearing mounting portion 74 on the vane inner shell 73, so that the installation is convenient and the structure is stable.
As shown in fig. 3 to 8, the motor main shaft 25 is provided with an end face round nut 19 and a middle round nut 23, the round nut can bear larger axial force, the position stability is improved through a locking component, the running efficiency and the service life of the device are improved, and a shaft sleeve group 26 is arranged between the adjacent impeller assemblies 6 and guide vane assemblies 7 on the motor main shaft 25, so that the axial position stability of each motor component is improved.
Install annular shell layer 1 on the shell body 8, outer baffle 9 is transversely and vertically installed to shell body 8 outer wall, sets up outer sound insulation material layer 10 between shell body 8 outer wall and the annular shell layer 1, install annular inner shell layer 15 on the inner shell body 14, install interior sound insulation material layer between annular inner shell layer 15 outer wall and the shell body 8 inner wall, inner baffle 16 is transversely installed to inner shell body 14 outer wall, install damping material layer 17 between inner shell body 14 outer wall and the annular inner shell layer 15, the baffle has increased casing structural strength, damping material layer 17 and double-deck soundproof cotton's setting, the good sound insulation effect of guarantee casing.
As shown in fig. 1 and 2, the bottom of the outer shell 8 is provided with a base 2, two hanging rings 4 are installed at the top of the outer shell 8, and a motor wiring port 5 is installed in the middle of the top, so that the structure is firm, and the installation and the use are convenient.
As shown in fig. 3 to 8, the two sides of the inner housing 14 are provided with outer ring plates 13, an inner connecting ring 18 is installed above the outer ring plates 13, an end surface disc 12 is further arranged on the outer side of the outer ring plates 13, the end surface disc 12 is installed on the outer housing 8 through a bolt assembly, the outer ring plates 13, the inner connecting ring 18 and the inner housing 14 are integrally fixed, and the inner housing is convenient to install, stable in structure and beneficial to adding and replacing damping materials and soundproof cotton.
Two end face flanges 3 are installed on two sides of the outer shell 8, the end face flanges 3 are installed on the outer shell 8 through bolt assemblies and are integrally fixed with the end face disc 12 and the inner shell 14, the structural strength of the end face flanges 3 is high, and the applicability of the fan is improved through combination of the fan or connection with an external pipeline.
As shown in fig. 5, the outer casing 8 has an end flange connection portion 30, the end flange 3 is aligned with the end flange connection portion 30 and is fastened and mounted by a bolt assembly, an annular step mounting surface 11 is provided on the end flange connection portion 30, and the outer peripheral edge of the end disc 12 is embedded in the step mounting surface 11, so that the surface of the end disc 12 is flush with the surface of the end flange connection portion 30, and the installation is convenient, and the outer peripheral edge of the end disc 12 is attractive and durable.
Meanwhile, in order to improve the fan efficiency, the low-noise multistage axial flow fan parameter of the invention meets the following conditions:
Parameters of the annular shell layer, the shell body and the outer sound insulation material layer, namely the thickness S of the annular shell layer 1 is=0.5-2 mm, the main body thickness S of the shell body 8 is=2-8 mm, the length L of the shell body 8 is=460-690 mm, the thickness S of the outer sound insulation material layer 10 is=10-30 mm, and the length L of the outer sound insulation material layer 10 is=455-670 mm;
The parameters of the inner sound insulation material layer, the annular inner shell layer, the inner shell and the damping material layer are that the thickness S of the inner sound insulation material layer is 10-40mm, the length L of the inner sound insulation material layer is 455-670mm, the thickness S of the annular inner shell layer 15 is 0.5-2mm, the thickness of the damping material layer 17 is 10-30mm, the main body thickness S of the inner shell 14 is 2-8mm, the length L of the inner shell 14 is 460-675mm, and the diameter D of the inner wall of the inner shell 14 is 242-362mm;
Air inlet guide cover parameters, namely the maximum diameter D=120-240 mm of the air inlet guide cover 60, and the axial distance L=30-45 mm of the air inlet guide cover 60;
The parameters of each stage of impeller comprise that the diameter D of the outer edge of each impeller blade 61 is=240-360 mm, the diameter D of the outer wall of each impeller shell is=120-240 mm, the axial distance L of each impeller shell is=35-50 mm, the number of blades of each stage of impeller is 5-20, the inlet angle beta 1 of each impeller blade 61 is 20 degrees or more and less than or equal to beta 1 degrees and less than or equal to 90 degrees, the outlet angle beta 2 of each impeller blade 61 is 20 degrees or more and less than or equal to beta 2 degrees and less than or equal to 90 degrees, and the blade wrap angle theta of each impeller blade 61 is 0 degrees or more and less than or equal to theta and less than or equal to 90 degrees;
The outer edge diameter D=242-362 mm of the guide vane 72, the outer wall diameter d=120-240 mm of the guide vane inner shell 73, the axial distance L=100-130 mm of the guide vane inner shell 73 for mounting the motor, the axial distance L=40-60 mm of other guide vane inner shells 73, the number of the guide vane 72 at each stage is 10-30, the blade inlet angle beta 1 of the guide vane 72 is 100 degrees or less and is equal to or less than 1 degrees and is equal to or less than 170 degrees, the blade outlet angle beta 2 of the guide vane 72 is 20 degrees or less and is equal to or less than 2 degrees and is equal to or less than 90 degrees, and the blade wrap angle theta of the guide vane 72 is 0 degrees or less and is equal to or less than 90 degrees.
It can be understood that the design size of the fan can be calculated in a dimensionless manner, and the fan has the same technical effect when the parameter value is reduced in equal proportion or increased in equal proportion.
Example 1:
Embodiment 1 is the above-mentioned five-stage axial fan, and the structure, the size of each impeller are the same, and one-level, four-level are the bearing guide vane that the structure is the same, and the second grade is the motor guide vane, and three-level, five-level are the cavity guide vane, and the structure, the size of each guide vane are basically the same, but motor guide vane length is greater than other guide vanes, further adopts following parameter:
Annular shell layer, outer shell, outer sound insulation layer parameters: annular shell layer 1 thickness s=1 mm, outer shell body 8 body thickness s=5 mm, outer shell body 8 length l=567mm, outer sound insulation layer 10 thickness s=20 mm, outer sound insulation layer 10 length l=551 mm;
the parameters of the inner sound insulation material layer, the annular inner shell layer, the inner shell and the damping material layer are that the thickness S of the inner sound insulation material layer is=30 mm, the length L of the inner sound insulation material layer is=551 mm, the thickness S of the annular inner shell layer 15 is=1 mm, the thickness of the damping material layer 17 is 16mm, the main body thickness S of the inner shell 14 is=6 mm, the length L of the inner shell 14 is=553 mm, and the diameter D of the inner wall of the inner shell 14 is=301 mm;
air inlet guide cover parameters, namely the maximum diameter D=153 mm of the air inlet guide cover 60, and the axial distance L=36 mm of the air inlet guide cover 60;
The parameters of the primary impeller, namely the diameter D=300 mm of the outer edges of the blades of the primary impeller 6a, the diameter d=153 mm of the outer wall of the shell of the primary impeller 6a, the axial distance L=43 mm of the primary impeller 6a, the number of the blades of the primary impeller 6a is 14, the inlet angle beta 1 =25 degrees of the blades of the primary impeller 6a, the outlet angle beta 2 =50 degrees of the blades of the primary impeller 6a, and the blade wrap angle theta=40 degrees of the primary impeller 6 a;
The primary guide vane parameters are that the outer edge diameter D=301 mm of the primary guide vane 7a blades 72, the outer wall diameter d=153 mm of the guide vane inner shell 73 of the primary guide vane 7a, the axial distance L=52 mm of the guide vane inner shell 73 of the primary guide vane 7a, the number of the primary guide vane 7a blades 72 is 17, the blade inlet angle beta 1 =160° of the primary guide vane 7a blades 72, the blade outlet angle beta 2 =80° of the primary guide vane 7a blades 72, and the blade wrap angle theta=3° of the primary guide vane 7a blades 72;
two to five stage impeller parameters: the same as the primary impeller 6 a;
Secondary guide vane parameters, namely the axial distance L=116 mm of the guide vane inner shell 73 of the secondary guide vane 7b, and other designs are the same as those of the primary guide vane 7 a;
the three to five stage guide vane parameters are the same as the one stage impeller 6 a.
Through fan test, as shown in fig. 13, compared with a conventional fan with the same flow, the fan has higher pressure and better fan efficiency, the noise of the conventional fan is 82dB, the noise of the fan is 64dB, and the operation noise is also obviously reduced.
It should be noted that the above-mentioned embodiments are merely preferred embodiments of the present invention, and are not intended to limit the scope of the present invention, and equivalent changes made on the basis of the above-mentioned embodiments are all within the scope of the present invention.
Claims (10)
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| CN202510252452.7A CN119755110A (en) | 2025-03-05 | 2025-03-05 | Low-noise multistage axial flow fan |
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| CN201526473U (en) * | 2009-10-23 | 2010-07-14 | 上海鼓风机厂有限公司 | Axial flow compressor formed by connecting a plurality of single-stage axial flow fans in series |
| CN108431426A (en) * | 2015-06-12 | 2018-08-21 | 创科（澳门离岸商业服务）有限公司 | Axial flow fan blower |
| CN206330187U (en) * | 2016-12-29 | 2017-07-14 | 宁波方太厨具有限公司 | A kind of single air-inlet range hood |
| CN111927795A (en) * | 2020-08-20 | 2020-11-13 | 绍兴智新机电科技有限公司 | Two-stage axial flow low-noise fan |
| CN217055722U (en) * | 2022-04-24 | 2022-07-26 | 山西省安瑞风机电气股份有限公司 | Mining low-noise local ventilator capable of quickly replacing noise reduction layer |
| CN119062594A (en) * | 2024-11-05 | 2024-12-03 | 绍兴智新机电科技有限公司 | A low-vibration and low-noise two-stage axial flow fan |
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