CN215333531U - Non-equidistant radial clearance axial flow fan - Google Patents
Non-equidistant radial clearance axial flow fan Download PDFInfo
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- CN215333531U CN215333531U CN202121260033.1U CN202121260033U CN215333531U CN 215333531 U CN215333531 U CN 215333531U CN 202121260033 U CN202121260033 U CN 202121260033U CN 215333531 U CN215333531 U CN 215333531U
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- axial flow
- flow fan
- equidistant radial
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- radial gap
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Abstract
The utility model discloses a non-equidistant radial gap axial flow fan, which comprises: the shell is of a cylindrical structure with two communicated ends; the inner wall of the shell is sequentially provided with an arc section, an equal-diameter section and a conical diffusion section from one side of the air inlet to one side of the air outlet; the mounting frame is arranged in the machine shell, and a driving motor is arranged at the center of the mounting frame; the mounting disc is fixedly connected with an output shaft of the driving motor; a plurality of fan blades are arranged on the mounting disc at equal intervals; the utility model utilizes the non-equidistant radial clearance between the blade tip and the casing, reduces the wind speed and the noise, simultaneously slows down the strength of secondary flow and clearance vortex, and improves the static pressure and the efficiency.
Description
Technical Field
The utility model belongs to the technical field of axial flow fan design, and particularly relates to a non-equidistant radial gap axial flow fan.
Background
Compared with a centrifugal fan, the axial flow fan has the advantages of large air volume, high efficiency, simple structure and the like, but under the same air volume and air pressure, the noise of the axial flow fan is much higher than that of the centrifugal fan, the existing axial flow fan basically achieves the purpose of noise reduction by changing the shape of the blade, and the design and process realization difficulty of the noise reduction blade is high, so that the shell of the axial flow fan needs to be structurally improved on the basis of the original design, and the design and process realization difficulty is reduced while the purpose of noise reduction is achieved.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a non-equidistant radial gap axial flow fan to solve the problems in the background technology.
In order to achieve the purpose, the utility model provides the following technical scheme:
a non-equidistant radial gap axial flow fan comprising:
the shell is of a cylindrical structure with two communicated ends; the inner wall of the shell is sequentially provided with an arc section, an equal-diameter section and a conical diffusion section from one side of the air inlet to one side of the air outlet;
the mounting frame is arranged in the machine shell, and a driving motor is arranged at the center of the mounting frame;
the mounting disc is fixedly connected with an output shaft of the driving motor;
the flabellum, the flabellum has a plurality of, a plurality of the flabellum is located on the installation disc at equal intervals.
And the conical diffusion section is provided with an annular section.
The inner diameter of the annular section is consistent with that of the equal-diameter section.
The width of the annular section and the length of the blade tip of the blade are arranged in a certain proportion;
the fan blade comprises a front edge, a second arc-shaped section and a rear edge, the lower end of the front edge is connected with the lower end of the rear edge through the second arc-shaped section, and the upper end of the front edge is connected with the upper end of the rear edge through the blade tip.
And sawteeth are arranged on the rear edge.
The horizontal distance between the left end face of the annular section and the upper endpoint of the front edge of the blade is a, the horizontal distance between the right end face of the annular section and the upper endpoint of the rear edge of the blade is b, and the ratio of a to b is 3: 2.
Compared with the prior art, the utility model has the beneficial technical effects that:
the utility model utilizes the non-equidistant radial clearance between the blade tip and the casing, reduces the wind speed and the noise, simultaneously slows down the strength of secondary flow and clearance vortex, and improves the static pressure and the efficiency.
Drawings
FIG. 1 is a front view of the present invention;
FIG. 2 is a cross-sectional view of FIG. 1;
FIG. 3 is a schematic view of the upper tip airflow during use.
In the figure: 1. a fan blade; 2. a housing; 11. a leading edge; 13. a trailing edge; 14. a blade tip; 21. a circular arc section; 22. a constant diameter section; 23. an annular segment; 24. a conical diffuser section.
Detailed Description
The utility model is further described with reference to the following figures and specific embodiments.
As shown, a non-equidistant radial gap axial flow fan comprises:
the casing 2 is of a cylindrical structure with two communicated ends; the inner wall of the shell 2 is sequentially provided with an arc section 21, an equal-diameter section 22 and a conical diffusion section 24 from one side of the air inlet to one side of the air outlet;
the arc section 21 of the casing 2 is used for increasing the inlet area to reduce the inlet wind speed and the inlet noise, the conical diffuser section 24 is used for reducing the outlet noise of the blades by increasing the outlet area of the blades and reducing the outlet air speed of the blades and recovering partial annular dynamic pressure of the outlet of the blades into static pressure, and the inlet end and the outlet end of the blades are improved to obtain higher static pressure value and lower noise value than the existing fan.
A mounting frame arranged in the casing 2, wherein a driving motor is arranged at the center of the mounting frame (the mounting frame and the driving motor are not shown in the figure); the mounting rack can be a cross-shaped mounting rack;
the mounting disc is fixedly connected with an output shaft of the driving motor;
flabellum 1, flabellum 1 has a plurality of, a plurality of flabellum 1 is located on the installation disc at equal intervals.
The conical diffuser section 24 is provided with an annular section 23.
The inner diameter of the ring section 23 is identical to the inner diameter of the constant diameter section 22.
The width of the annular section 23 is set in proportion to the length of the blade tip 14 of the blade; between 1:15 and 1: 20.
FIG. 3 is a schematic view of the upper tip airflow during use. Through the structure, when the airflow flows in the gap between the blade tip 14 and the annular section 23, sudden acceleration and deceleration actions are generated, and further, the secondary flow and the gap vortex strength are effectively slowed down.
The fan blade 1 comprises a front edge 11, a second arc-shaped section and a rear edge 13, the lower end of the front edge 11 is connected with the lower end of the rear edge 13 through the second arc-shaped section, and the upper end of the front edge 11 is connected with the upper end of the rear edge 13 through a blade tip 14. The second arc-shaped section is connected with the side surface of the mounting disc.
The rear edge 13 is provided with serrations.
As shown in fig. 2, the horizontal distance between the left end surface of the ring-shaped section 23 and the upper end point of the leading edge 11 of the blade is a, the horizontal distance between the right end surface of the ring-shaped section 23 and the upper end point of the trailing edge 13 of the blade is b, and the ratio of a to b is 3: 2.
The utility model reduces the wind speed and noise of the inlet and the outlet by changing the shape of the casing 2 and changing the axial flow line of the blade runner, and changes the flow field distribution of the runner of the blade tip 14 by adding the annular section 23 in the casing 2, thereby effectively slowing down the secondary flow and the vortex strength of the clearance, improving the static pressure and the efficiency of the fan, and further reducing the noise value of the blade tip 14.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the utility model, and any modifications, equivalents, improvements and the like that are within the spirit and principle of the present invention are intended to be included in the scope of the present invention.
Claims (7)
1. A non-equidistant radial gap axial flow fan, comprising:
the shell is of a cylindrical structure with two communicated ends; the inner wall of the shell is sequentially provided with an arc section, an equal-diameter section and a conical diffusion section from one side of the air inlet to one side of the air outlet;
the mounting frame is arranged in the machine shell, and a driving motor is arranged at the center of the mounting frame;
the mounting disc is fixedly connected with an output shaft of the driving motor;
the flabellum, the flabellum has a plurality of, a plurality of the flabellum is located on the installation disc at equal intervals.
2. A non-equidistant radial gap axial flow fan according to claim 1, wherein said conical diffuser section is provided with an annular section.
3. A non-equidistant radial gap axial flow fan according to claim 2, wherein the inner diameter of said annular segment coincides with the inner diameter of the constant diameter segment.
4. A non-equidistant radial gap axial flow fan according to claim 3, wherein the width of said ring segment is proportional to the tip length of said fan blades.
5. The non-equidistant radial gap axial flow fan of claim 4, wherein said fan blades comprise a leading edge, a second arc segment and a trailing edge, a lower end of said leading edge being connected to a lower end of said trailing edge by said second arc segment, an upper end of said leading edge being connected to an upper end of said trailing edge by said blade tip.
6. A non-equidistant radial gap axial flow fan according to claim 5, wherein said trailing edge is provided with serrations.
7. The non-equidistant radial gap axial flow fan of claim 6, wherein the horizontal distance between the left end surface of the ring segment and the upper end point of the front edge of the fan blade is a, the horizontal distance between the right end surface of the ring segment and the upper end point of the rear edge of the fan blade is b, and the ratio of a to b is 3: 2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121260033.1U CN215333531U (en) | 2021-06-07 | 2021-06-07 | Non-equidistant radial clearance axial flow fan |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121260033.1U CN215333531U (en) | 2021-06-07 | 2021-06-07 | Non-equidistant radial clearance axial flow fan |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215333531U true CN215333531U (en) | 2021-12-28 |
Family
ID=79551539
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121260033.1U Active CN215333531U (en) | 2021-06-07 | 2021-06-07 | Non-equidistant radial clearance axial flow fan |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215333531U (en) |
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2021
- 2021-06-07 CN CN202121260033.1U patent/CN215333531U/en active Active
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