CN211039145U - High-efficient low noise does not have spiral case fan wheel - Google Patents
High-efficient low noise does not have spiral case fan wheel Download PDFInfo
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- CN211039145U CN211039145U CN201921837518.5U CN201921837518U CN211039145U CN 211039145 U CN211039145 U CN 211039145U CN 201921837518 U CN201921837518 U CN 201921837518U CN 211039145 U CN211039145 U CN 211039145U
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Abstract
The utility model discloses a high-efficiency low-noise volute-free fan impeller, which comprises a fan impeller body, wherein the fan impeller body is provided with blades, a wheel cover A, a wheel cover B, a shaft disc and a bearing, the outer diameter of the fan impeller body is 1.15-1.2 times of the outer diameter of the blades, a bladeless diffusion part is added, the speed of outlet air flow can be greatly reduced, the outlet speed and the gas kinetic energy are reduced, the static pressure value of gas is increased, the static pressure efficiency of the fan is improved, an impeller blade outlet angle on the fan impeller body is selected to be between 22.5-30 degrees, thus ensuring that the impeller does work to mainly improve the static pressure energy and also controlling the speed of blade outlet, reducing the noise level, better converting the kinetic energy of the impeller outlet into pressure energy by bladeless diffusion, improving the static pressure efficiency of the fan, reducing the blade outlet angle and reducing the impeller outlet speed, the impeller reaction degree is improved, and the fan fundamental frequency, 1/2 fundamental frequency and frequency doubling noise are reduced by the inclined blade structure and the non-parallel structure of the blade outlet.
Description
Technical Field
The utility model relates to a no spiral case fan wheel technical field specifically is a high-efficient low noise does not have spiral case fan wheel.
Background
The volute-free fan is widely applied to an air handling unit for a third-generation nuclear power station. As the only active part of the air handling unit, the efficiency and the noise performance of the fan directly influence the operation economy and the noise pollution level of the unit operation environment.
The existing volute-free fan impeller generally has two forms, namely a wing-shaped blade and an arc-shaped plate-shaped blade, the two types of impellers are both of structures in which the volute-free fan impeller is directly used without a volute, the matching degree of the impeller and the structures is not enough, and the static pressure efficiency and the noise index of the fan are not ideal enough. The main body is as follows:
1. the speed of an impeller outlet is high, the outlet angle of the existing volute-free fan is about 30-50 degrees, the speed of the fan impeller outlet is high, kinetic energy is high, and because the volute-free fan does not collect gas, the efficiency of converting kinetic energy into static pressure energy is low, and the whole static pressure efficiency is low.
2. Because the outlet speed of the impeller is high, the rotating noise generated by the uneven gas pressure and speed caused by the wake of the blade is high; still because impeller exit velocity is higher, the vortex noise that the gas produced turbulence boundary layer, vortex and breaks away from and cause the pressure distribution pulsation on the blade is great when flowing through the blade.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a high-efficient low noise does not have spiral case fan wheel to solve the problem that proposes in the above-mentioned background art.
In order to achieve the above object, the utility model provides a following technical scheme: the utility model provides a high-efficient low noise does not have spiral case fan wheel, includes the fan wheel body, be equipped with the bearing on the fan wheel body, the outside of bearing is equipped with the blade, the outside lateral wall welded connection of blade and bearing, the both sides of blade are equipped with wheel cap A and wheel cap B respectively, the side of blade respectively with wheel cap A and wheel cap B welded fastening.
Preferably, the outer diameter of the wheel cover A and the outer diameter of the wheel cover B on the fan impeller body are 1.15-1.2 times of the outer diameter of the blades, and the center of the outer side of the wheel cover A is provided with a vaneless diffuser which is connected with the wheel cover A in a welding mode.
Preferably, the exit angle between the shroud a and the rearward impeller blades is 22.5-30 °.
Preferably, a non-vertical structure is adopted between the wheel cover A and the wheel cover B and backward impeller blades, and the included angle between the blades and the wheel cover A and the wheel cover B is 70-85 degrees.
Preferably, the blade outlet is of an inclined structure, an included angle between the blade outlet and the bearing is 10-20 degrees, and the diameter of the blade on one side close to the wheel cover A and the wheel cover B is large.
Compared with the prior art, the beneficial effects of the utility model are that:
(1) the whole outer diameter of the impeller is 1.15-1.2 times of the outer diameter of the blade, a bladeless diffusion part is added, the outlet air flow speed can be greatly reduced, the outlet speed and the air kinetic energy are reduced, the static pressure value of air is increased, and the static pressure efficiency of the fan is improved;
(2) the outlet angle of the impeller blade is selected to be 22.5-30 degrees, so that the impeller can be ensured to do work to mainly improve static pressure energy, and the speed of the outlet of the blade can be controlled to reduce the noise level;
(3) the installation angle of the blade and the wheel cover is 70-85 degrees, so that the stress at the blade root of the blade of the impeller can be reduced, the working area of the blade can be increased, the flow field is improved, the efficiency of the fan is improved, and the noise of the fan is reduced;
(4) the blade outlet is of a non-parallel structure, the included angle between the blade outlet and the axial direction is about 10-20 degrees, and the diameter of the blade close to the wheel cover is large, so that the pulse airflow at the impeller outlet can be effectively reduced, and the noise of the fan is remarkably reduced;
(5) through the application of the bladeless diffusion, kinetic energy of an impeller outlet is better converted into pressure energy, the static pressure efficiency of the fan is improved, the outlet angle of the blade is reduced by reducing the outlet angle of the blade, the outlet speed of the impeller is reduced, the reaction degree of the impeller is improved, and through the inclined blade structure, the non-parallel structure of the outlet of the blade reduces the fundamental frequency, 1/2 fundamental frequency and frequency doubling noise of the fan.
Drawings
Fig. 1 is a schematic diagram of a three-dimensional structure of a volute-free fan impeller of the present invention;
fig. 2 is a schematic view of the impeller blade angle and the vaneless diffusion of the volute-less fan impeller of the present invention;
fig. 3 is a cross-sectional view of the volute-free fan impeller of the present invention;
FIG. 4 shows a non-perpendicular structure of the blade and the wheel cover of the present invention;
fig. 5 is a schematic view of the non-parallel structure of the blade outlet of the present invention.
In the figure: 1. a blade; 2. a wheel cover A; 3. a wheel cover B; 4. a reel; 5. a bearing; 6. A fan impeller body.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Referring to fig. 1-5, the present invention provides a technical solution: the utility model provides a high-efficient low noise does not have spiral case fan wheel, includes fan wheel body 6, is equipped with bearing 5 on the fan wheel body 6, and bearing 5's the outside is equipped with blade 1, and blade 1 and bearing 5's outside lateral wall welded connection, blade 1's both sides are equipped with wheel cap A2 and wheel cap B3 respectively, and blade 1's side respectively with wheel cap A2 and wheel cap B3 welded fastening.
A wheel cover A2 is arranged on a fan impeller body 6, the outer diameter of a wheel cover B3 is 1.15-1.2 times of the outer diameter of a blade, a vaneless diffuser is arranged in the center of the outer side of the wheel cover A2 and is connected with the wheel cover A2 in a welding mode, a vaneless diffuser portion is added, the speed of outlet air flow can be greatly reduced, the speed of outlet air and kinetic energy of air are reduced, the static pressure value of air is increased, and the static pressure efficiency of a fan is improved.
The outlet angle between the shroud A2 and the backward impeller blade is 22.5-30 degrees, which can ensure the impeller work to improve the static pressure energy, and can control the outlet speed of the blade to reduce the noise level.
A non-vertical structure is adopted between the wheel cover A2 and the wheel cover B3 and the backward impeller blade 1, and the included angle between the blade and the wheel cover A2 and between the wheel covers B3 is 70-85 degrees, so that the stress at the blade root of the impeller blade can be reduced, the working area of the blade 1 can be increased, the flow field is improved, the efficiency of the fan is improved, and the noise of the fan is reduced.
The outlet of the blade 1 is of an inclined structure, an included angle between the outlet of the blade 1 and the bearing 5 is 10-20 degrees, the diameter of the blade close to one side of the wheel cover A2 and the wheel cover B3 is large, and the diameter of the blade close to the wheel cover is large, so that the pulse airflow at the outlet of the impeller can be effectively reduced, and the noise of the fan is remarkably reduced.
This fan impeller body 6 is through utilizing the bladeless diffusion to change impeller export kinetic energy better for pressure energy, has improved the static pressure efficiency of fan, through reducing blade exit angle, reduces impeller exit velocity, improves impeller reaction degree, and through the blade 1 structure of slope, the non-parallel structure of blade export has reduced the fan fundamental frequency, 1/2 fundamental frequency and doubling of frequency noise.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (5)
1. The utility model provides a high-efficient low noise does not have spiral case fan wheel, includes fan wheel body (6), its characterized in that: be equipped with bearing (5) on fan wheel body (6), the outside of bearing (5) is equipped with blade (1), the outside lateral wall welded connection of blade (1) and bearing (5), the both sides of blade (1) are equipped with wheel cap A (2) and wheel cap B (3) respectively, the side of blade (1) respectively with wheel cap A (2) and wheel cap B (3) welded fastening.
2. A high efficiency, low noise, volute-free fan impeller as claimed in claim 1, wherein: the impeller of the fan is characterized in that a wheel cover A (2) is arranged on the fan impeller body (6), the outer diameter of the wheel cover B (3) is 1.15-1.2 times of the outer diameter of a blade, a vaneless diffuser is arranged in the center of the outer side of the wheel cover A (2), and the vaneless diffuser is connected with the wheel cover A (2) in a welding mode.
3. A high efficiency, low noise, volute-free fan impeller as claimed in claim 1, wherein: the exit angle between the shroud A (2) and the rearward impeller blades is 22.5-30 deg.
4. A high efficiency, low noise, volute-free fan impeller as claimed in claim 1, wherein: the impeller is characterized in that the impeller cover A (2), the impeller cover B (3) and the backward impeller blades (1) are in a non-vertical structure, and the included angle between each blade and the impeller cover A (2) and the included angle between the impeller covers B (3) are 70-85 degrees.
5. A high efficiency, low noise, volute-free fan impeller as claimed in claim 1, wherein: the outlet of the blade (1) is of an inclined structure, an included angle between the outlet of the blade (1) and the bearing (5) is 10-20 degrees, and the diameter of the blade close to one side of the wheel cover A (2) and the wheel cover B (3) is large.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921837518.5U CN211039145U (en) | 2019-10-30 | 2019-10-30 | High-efficient low noise does not have spiral case fan wheel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921837518.5U CN211039145U (en) | 2019-10-30 | 2019-10-30 | High-efficient low noise does not have spiral case fan wheel |
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| Publication Number | Publication Date |
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| CN211039145U true CN211039145U (en) | 2020-07-17 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201921837518.5U Active CN211039145U (en) | 2019-10-30 | 2019-10-30 | High-efficient low noise does not have spiral case fan wheel |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113175443A (en) * | 2021-06-01 | 2021-07-27 | 雷勃电气(嘉兴)有限公司 | Efficient low-noise three-dimensional flow impeller of backward centrifugal fan without volute |
-
2019
- 2019-10-30 CN CN201921837518.5U patent/CN211039145U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113175443A (en) * | 2021-06-01 | 2021-07-27 | 雷勃电气(嘉兴)有限公司 | Efficient low-noise three-dimensional flow impeller of backward centrifugal fan without volute |
| CN113175443B (en) * | 2021-06-01 | 2023-01-10 | 雷勃电气(嘉兴)有限公司 | Efficient low-noise three-dimensional flow impeller of backward centrifugal fan without volute |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP02 | Change in the address of a patent holder |
Address after: School of mechanical and energy engineering, Tongji University, no.4800 Cao Road, Anting Town, Jiading District, Shanghai 201800 Patentee after: Yu Boyang Address before: No.88, Tongsheng Avenue, Nantong Economic and Technological Development Zone, Nantong City, Jiangsu Province, 226000 Patentee before: Yu Boyang |
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| CP02 | Change in the address of a patent holder |