CN220227287U - Stall-preventing structure of axial flow fan - Google Patents
Stall-preventing structure of axial flow fan Download PDFInfo
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- CN220227287U CN220227287U CN202321489309.2U CN202321489309U CN220227287U CN 220227287 U CN220227287 U CN 220227287U CN 202321489309 U CN202321489309 U CN 202321489309U CN 220227287 U CN220227287 U CN 220227287U
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- 230000003014 reinforcing effect Effects 0.000 claims abstract description 13
- 230000000149 penetrating effect Effects 0.000 claims abstract description 3
- 238000003466 welding Methods 0.000 claims description 18
- 239000002994 raw material Substances 0.000 abstract description 3
- 230000000694 effects Effects 0.000 description 4
- 238000005096 rolling process Methods 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 238000003698 laser cutting Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 108010029852 ductin Proteins 0.000 description 1
- 230000003670 easy-to-clean Effects 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
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Abstract
The utility model relates to an anti-stall structure of an axial flow fan, which comprises an air duct, an outer cylinder and a guide vane, wherein the air duct is integrally formed and coiled into a circle, a plurality of through holes penetrating through the inner wall are formed in the inner wall of the air duct, the through holes are distributed in two groups along the direction surrounding the axis of the air duct, the outer cylinder is arranged on the outer wall of the air duct in a surrounding manner, an airflow space is formed between the outer cylinder and the outer wall of the air duct, and the two groups of through holes are communicated with the airflow space; the air flow space is internally provided with a reinforcing plate, two ends of the reinforcing plate are respectively connected with the inner wall of the outer cylinder and the outer wall of the air cylinder, the reinforcing plate is positioned between two groups of through holes so as to separate the two groups of through holes, and the guide vane is arranged in the air flow space. The stall-preventing structure of the axial flow fan can ensure uniform gap between the air duct and the blades, is simple and convenient to form, saves raw materials and saves working hours.
Description
Technical Field
The utility model belongs to the technical field of axial flow fans, and particularly relates to an anti-stall structure of an axial flow fan.
Background
The axial flow fan is widely used due to the technical advantages of high efficiency, small rotor inertia and the like. However, the axial flow fan has a stall area, stall is more likely to occur particularly under a low-flow working condition, a certain risk is brought in operation, and the application range of the axial flow fan is limited. Stall of an axial flow fan is an inherent hydrodynamic property, and although changing the blade profile and the mounting angle can reduce the stall zone to some extent, the changes can reduce the aerodynamic efficiency of the blades at rated flow, and the side effect is that the fan operation efficiency is reduced.
The anti-stall mode of the existing axial flow fan is that an anti-stall structure is arranged on the wind cylinders around the fan blades, so that the anti-stall effect is achieved. As shown in fig. 1, three air cylinders are arranged on the periphery of the blade, wherein two protruding outer cylinders are welded before two adjacent air cylinders, two opposite sides of the three air cylinders are welded with air cylinder flanges, and guide sheets are welded in the protruding outer cylinders, so that a guide cylinder is formed, and an anti-stall structure of the axial flow fan is realized.
However, in the existing anti-stall structure, three steel plates are needed for the wind barrel on the periphery of the impeller to be subjected to splice welding, and the wind barrel and two outer barrels are needed to be subjected to splice welding, so that welding scribing is needed, the welding workload is large, the operation space of the welding space of the axial flow fan is small, the operation is inconvenient, the working time is long, and welding slag is not easy to clean. Meanwhile, the welding part is easy to deform, the roundness of the air duct is influenced by the deformation, the gap between the air duct and the matching part of the blade is uneven, and the blade tip and the inner wall of the air duct are easy to scratch.
Disclosure of Invention
Aiming at the defects in the prior art, the utility model aims to provide an anti-stall structure of an axial flow fan so as to overcome the defects caused by welding of an air duct.
In order to achieve the above purpose, the utility model adopts the technical scheme that: the utility model provides an axial fan prevents stall structure, includes dryer, urceolus and guide vane, dryer integrated into one piece and roll up into circular, is seted up a plurality of through-holes that run through the inner wall on its inner wall, a plurality of the through-holes are two sets of distributions along encircling the direction of dryer axis, the urceolus encircles and sets up on the outer wall of dryer, just form the air current space between urceolus and the outer wall of dryer, two sets of through-holes all with the air current space intercommunication; the air flow space is internally provided with a reinforcing plate, two ends of the reinforcing plate are respectively connected with the inner wall of the outer cylinder and the outer wall of the outer cylinder, the reinforcing plate is positioned between the two groups of through holes so as to separate the two groups of through holes, and the guide vane is arranged in the air flow space and connected with the outer wall of the outer cylinder and the inner wall of the outer cylinder.
Further, each group of through holes comprises two rows, and the through holes in the two rows are staggered.
Further, each of the through holes is elliptical, and the long axis direction is along the direction around the axis of the outer cylinder.
Further, the distance between two adjacent rows of through holes is half of the length of the through holes in the long axis direction.
Further, the number of the guide vanes is multiple, the guide vanes are respectively located in each row of through holes, and two adjacent through holes are located between the two adjacent through holes.
Further, the guide vane is connected with the air duct and the outer cylinder through spot welding.
Further, the two ends of the air duct along the axial direction extend towards the direction vertical to the axial line to form an air duct flange integrated with the air duct.
Further, the roundness of the wind barrel isWithin the inner part.
Further, the outer cylinder comprises an outer cylinder flange and an outer cylinder coiled plate, the outer cylinder coiled plate is circular, and the outer cylinder flange is respectively connected with the outer cylinder coiled plate and the air cylinder so as to form connection of the outer cylinder and the air cylinder.
Further, the connection between the outer cylinder flange and the outer cylinder coiled plate and the connection between the outer cylinder flange and the air cylinder are welded.
The utility model has the following effects: the air duct is formed by rolling a plate, does not need to be formed by welding a plurality of flat plates, and ensures the roundness of the air ductIn the inside, the even clearance of dryer and blade has been guaranteed. The parts are small in deformation, convenient to install and stable in airflow. The through hole is processed by the laser cutting machine in a numerical control mode, the processing precision is high, the positioning of each part is accurate, the forming is simple and convenient, the welding does not need to be marked, and the manual marking error is reduced. Compared with the original structure, the flange is saved, the welding workload is reduced, raw materials are saved, and the working time is saved.
Drawings
FIG. 1 is a schematic cross-sectional view of an anti-stall structure of a conventional axial flow fan;
FIG. 2 is a schematic structural view of an anti-stall structure of an axial flow fan provided by the utility model;
FIG. 3 is a schematic cross-sectional view of an anti-stall structure of an axial flow fan according to the present utility model;
fig. 4 is a schematic diagram of a via arrangement.
Reference numerals illustrate:
1. an air duct; 2. an outer cylinder; 3. a deflector; 4. a reinforcing plate; 11. a through hole; 21. an airflow space; 12. an air duct flange; 22. an outer cylinder flange; 23. and rolling the outer cylinder.
Detailed Description
The utility model is further described below with reference to the drawings and detailed description.
As shown in fig. 2-4, the stall preventing structure of an axial flow fan provided by the utility model comprises an air duct 1, an outer cylinder 2 and a guide vane 3, wherein the air duct 1 is integrally formed and rolled into a round shape, a plurality of through holes 11 penetrating through the inner wall are formed in the inner wall of the air duct, the through holes 11 are distributed in two groups along the direction encircling the axis of the air duct 1, the outer cylinder 2 is arranged on the outer wall of the air duct 1 in a surrounding manner, an airflow space 21 is formed between the outer cylinder 2 and the outer wall of the air duct 1, and the two groups of through holes 11 are communicated with the airflow space 21. The air flow space 21 is internally provided with the reinforcing plate 4, two ends of the reinforcing plate 4 are respectively connected with the inner wall of the outer cylinder 2 and the outer wall of the air cylinder 1, and the reinforcing plate 4 is positioned between the two groups of through holes 11 so as to separate the two groups of through holes 11, thereby realizing the effects of balancing air flow, reducing vortex, improving fan efficiency and reducing noise, and the guide vane 3 is arranged in the air flow space 21 and positioned at the through holes 11 and connected with the outer wall of the air cylinder 1 and the inner wall of the outer cylinder 2.
Further, each set of through holes 11 includes two rows, and the through holes 11 in the two rows are staggered.
Further, each through hole 11 is oval, and the long axis direction is along the direction around the axis of the outer cylinder 1.
Further, in the two rows of through holes 11, the distance between two adjacent through holes 11 is half the length of the through holes 11 in the longitudinal direction.
Further, the number of the guide vanes 3 is plural.
Further, the guide vane 3 is connected with the air duct 1 and the outer cylinder 2 through spot welding.
Further, both ends of the air duct 1 in the axial direction extend in a direction perpendicular to the axis, forming an air duct flange 12 integral with the air duct 1.
Further, the roundness of the wind barrel 1 isWithin the inner part.
Further, the outer cylinder 2 comprises an outer cylinder flange 22 and an outer cylinder coiled plate 23, the outer cylinder coiled plate 23 is circular, and the outer cylinder flange 22 is respectively connected with the outer cylinder coiled plate 23 and the air cylinder 1 to form connection between the outer cylinder 2 and the air cylinder 1.
Further, the connection between the outer cylinder flange 22, the outer cylinder coiled plate 23 and the air cylinder is welding.
As can be seen from the above embodiments, the utility model is formed by rolling a plate of the air duct without welding a plurality of plates, and the roundness of the air duct is ensuredIn the inside, the even clearance of dryer and blade has been guaranteed. The parts are small in deformation, convenient to install and stable in airflow. The through hole is processed by the laser cutting machine in a numerical control way, the processing precision is high, the positioning of each part is accurate, the forming is simple and convenient, the welding does not need to be marked, and the number of people is reducedAnd (5) scribing errors. Compared with the original structure, the flange is saved, the welding workload is reduced, raw materials are saved, and the working time is saved.
The device according to the utility model is not limited to the examples described in the specific embodiments, and a person skilled in the art obtains other embodiments according to the technical solution of the utility model, which also belong to the technical innovation scope of the utility model.
Claims (10)
1. An anti-stall structure of an axial flow fan, comprising:
the air duct is integrally formed, the coiled plate is circular, a plurality of through holes penetrating through the inner wall are formed in the inner wall of the air duct, the through holes are distributed in two groups along the direction surrounding the axis of the air duct, the outer cylinder is arranged on the outer wall of the air duct in a surrounding mode, an airflow space is formed between the outer cylinder and the outer wall of the air duct, and the two groups of through holes are communicated with the airflow space;
the air flow space is internally provided with a reinforcing plate, two ends of the reinforcing plate are respectively connected with the inner wall of the outer cylinder and the outer wall of the outer cylinder, the reinforcing plate is positioned between the two groups of through holes so as to separate the two groups of through holes, and the guide vane is arranged in the air flow space and connected with the outer wall of the outer cylinder and the inner wall of the outer cylinder.
2. The anti-stall structure of an axial flow fan as claimed in claim 1, wherein:
each group of through holes comprises two rows, and the through holes in the two rows are staggered.
3. The anti-stall structure of axial flow fan as claimed in claim 2, wherein:
each through hole is elliptical, and the long axis direction is along the direction surrounding the axis of the outer cylinder.
4. The anti-stall structure of claim 3, wherein:
the interval distance between two adjacent rows of through holes is half of the length of the through holes in the long axis direction.
5. The anti-stall structure of axial flow fan as claimed in claim 2, wherein:
the number of the guide vanes is multiple, the guide vanes are respectively positioned in each row of through holes, and the guide vanes are positioned between two adjacent through holes.
6. The anti-stall structure of claim 5, wherein:
the guide vane is connected with the air duct and the outer cylinder through spot welding.
7. The anti-stall structure of an axial flow fan as claimed in claim 1, wherein:
the two ends of the air duct along the axial direction extend towards the direction vertical to the axial line to form an air duct flange integrated with the air duct.
8. The anti-stall structure of an axial flow fan as claimed in claim 1, wherein:
the roundness of the air duct isWithin the inner part.
9. The anti-stall structure of an axial flow fan as claimed in claim 1, wherein:
the outer cylinder comprises an outer cylinder flange and an outer cylinder coiled plate, the outer cylinder coiled plate is round, and the outer cylinder flange is respectively connected with the outer cylinder coiled plate and the air cylinder so as to form connection of the outer cylinder and the air cylinder.
10. The anti-stall structure of an axial flow fan as claimed in claim 1, wherein:
the outer cylinder flange is welded with the outer cylinder coiled plate and the air cylinder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321489309.2U CN220227287U (en) | 2023-06-12 | 2023-06-12 | Stall-preventing structure of axial flow fan |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321489309.2U CN220227287U (en) | 2023-06-12 | 2023-06-12 | Stall-preventing structure of axial flow fan |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220227287U true CN220227287U (en) | 2023-12-22 |
Family
ID=89198786
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321489309.2U Active CN220227287U (en) | 2023-06-12 | 2023-06-12 | Stall-preventing structure of axial flow fan |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220227287U (en) |
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2023
- 2023-06-12 CN CN202321489309.2U patent/CN220227287U/en active Active
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