CN112610530A - Axial flow fan of distortion diffuser and applied this diffuser - Google Patents
Axial flow fan of distortion diffuser and applied this diffuser Download PDFInfo
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- CN112610530A CN112610530A CN202110017722.8A CN202110017722A CN112610530A CN 112610530 A CN112610530 A CN 112610530A CN 202110017722 A CN202110017722 A CN 202110017722A CN 112610530 A CN112610530 A CN 112610530A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/40—Casings; Connections of working fluid
- F04D29/52—Casings; Connections of working fluid for axial pumps
- F04D29/54—Fluid-guiding means, e.g. diffusers
- F04D29/541—Specially adapted for elastic fluid pumps
- F04D29/545—Ducts
- F04D29/547—Ducts having a special shape in order to influence fluid flow
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
- F04D29/661—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps
- F04D29/663—Sound attenuation
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
- F04D29/661—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps
- F04D29/667—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps by influencing the flow pattern, e.g. suppression of turbulence
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
- F04D29/68—Combating cavitation, whirls, noise, vibration or the like; Balancing by influencing boundary layers
- F04D29/681—Combating cavitation, whirls, noise, vibration or the like; Balancing by influencing boundary layers especially adapted for elastic fluid pumps
Abstract
The invention discloses a twisted diffusion cylinder and an axial flow fan applying the twisted diffusion cylinder, wherein the twisted diffusion cylinder comprises a cylinder body, the cylinder body is provided with a through ventilation hole along the axis direction, the two ends of the cylinder body along the axis direction are an air inlet end and an air outlet end, the air inlet end and the air outlet end are arranged along the axis, the inner wall surface of the cylinder body is gradually increased by the cross section area vertical to the axis, and the cylinder body is twisted along a coaxial spiral line; the axial flow fan comprises a wind wheel and the cylinder, and the spiral direction of the spiral line is opposite to the rotating direction of the wind wheel. The invention has the following beneficial effects: on the premise of not changing the original size and the installation matching size, when the airflow passes through the cylinder, reverse secondary flow is generated to weaken vortex and disturb a boundary layer on the inner wall surface, the rectification effect is enhanced, the tangential airflow flow is reduced, the flow speed of axial airflow is increased, the effects of pressurization, efficiency improvement, noise reduction and resistance reduction are further achieved on the basis of the original diffusion cylinder, the efficiency is improved by more than 2% through experimental calculation, and the noise is reduced by more than 2dB (A).
Description
Technical Field
The invention relates to the technical field of ventilation, in particular to a twisted diffusion cylinder and an axial flow fan applying the same.
Background
At present, the market places more and more importance on the performances of energy efficiency, noise and the like in the application of an axial flow fan, and higher requirements are put forward on the performances of the fan, generally, the axial flow fan comprises a wind wheel, a current collector and a diffusion cylinder, the current collector is coaxially sleeved outside the wind wheel, the air inlet end of the diffusion cylinder is connected with the air outlet end of the current collector, the diffusion cylinder and the current collector are coaxially arranged, the diffusion cylinder is used as an important part of the axial flow fan and can improve the performances of the fan, such as efficiency, noise and the like, the airflow flowing out of the impeller spirally advances according to the rotation direction of the impeller, the diffusion cylinder has the function of reducing the airflow speed by utilizing the airflow cross-sectional area larger than that of the current collector to convert the dynamic pressure of the airflow into static pressure, and plays a role of rectifying similar to a guide vane to a certain extent, however, the direct diffusion cylinder is adopted in, the direct diffusion cylinder has a limited degree of improving the energy efficiency and noise of the axial flow fan.
Therefore, if the components such as the impeller, the current collector and the like can be unchanged, the energy efficiency and the noise of the axial flow fan can be obviously improved only by modifying the diffusion cylinder and not increasing the original size, and the cost and the efficiency can be reduced undoubtedly.
Disclosure of Invention
In order to solve the above technical problems, an object of the present invention is to provide a twisted diffuser, which includes a cylindrical body, an inner wall surface of the cylindrical body gradually increases in cross-sectional area perpendicular to an axis from an air inlet end to an air outlet end, the cylindrical body is twisted along a spiral line from each cross-section perpendicular to a shaft, and the twisted diffuser has the advantages of significantly increasing pressure and efficiency, reducing noise and reducing drag for an axial flow fan without changing a maximum size of the cylindrical body.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a twisted diffusion cylinder comprises a cylinder body, wherein an air inlet end and an air outlet end are respectively arranged at two ends of the cylinder body along an axis direction, one surface of the cylinder body facing the axis is an inner wall surface, the inner wall surface is from the air inlet end to the air outlet end along the axis, and the inner wall surface is consistent with a straight diffusion cylinder in cross section area perpendicular to the axis and gradually increases;
the barrel is arranged along a coaxial spiral line in a twisted mode, the barrel sequentially comprises a plurality of sections perpendicular to the axis from the air inlet end to the air outlet end along the axis, an ith connecting line is formed by a point on the inner wall surface of the ith section and a central point connecting line, the same point on the inner wall surface of the (i + 1) th section is connected with the central point to form an (i + 1) th connecting line, and the projection of the ith connecting line and the (i + 1) th connecting line on the normal plane of the axis forms a twisted angle thetai，θi＞0°，i＝1、2、……、n，n≥2。
Preferably, the hydraulic diameter of the inner wall surface at the air inlet end is D, the area of the inner wall surface at the air inlet end is S, the circumference of the inner wall surface at the air inlet end is C, D is 4 · S/C, the pitch of the spiral line is L, the twist rate of the cylinder is Tr ═ L/D, Tr is 5 ≤ L/D, Tr is not less than 100, by such arrangement, because the cylinder is twisted along the coaxial spiral line, the reverse secondary flow generated when the air flow passes through the cylinder weakens the air flow vortex flowing out from the current collector, the rectification effect is enhanced, the tangential air flow is reduced, the axial flow speed is increased, and the secondary flow disturbs the boundary layer on the inner wall surface to a certain extent, on the premise of not increasing the maximum size of the original diffusion cylinder, the pressurization effect, noise reduction and drag reduction are further increased on the basis of the original diffusion cylinder, through test, the torsional curvature of the cylinder is in the range of 5-100, and the effect is better; if Tr is less than 5, namely the torsional curvature of the cylinder is too small, the strength of the reverse secondary flow generated by the airflow passing through the cylinder is too large, the generated secondary flow has too large strength and can play a reverse role, so that the flow loss is increased, and the cylinder cannot well play roles in pressurizing, improving the efficiency, reducing the noise and reducing the drag; if Tr is larger than 100, namely the torsional curvature of the cylinder is too large, the secondary flow generated by the airflow passing through the cylinder is too small, and the effects of pressurization, efficiency improvement, noise reduction and drag reduction of the cylinder are not obvious.
Preferably, Tr is more than or equal to 5 and less than or equal to 30, and through the arrangement, the torsion rate of the cylinder is in the range of 5 to 30, so that the best pressurization effect, noise reduction effect and drag reduction effect are achieved.
Preferably, the diameter of the inner wall surface at the air inlet end is d, the height of the cylinder is H, H is more than or equal to 1.5 d and less than or equal to 2.2 d, and through the arrangement, the height required by the cylinder is determined according to the diameter of the inner wall surface at the air inlet end, namely the height of the cylinder is determined according to the air inlet amount, so that the cylinder is ensured to have enough height to guide airflow, and the effects of pressurization, efficiency improvement, noise reduction and drag reduction are achieved.
Preferably, the plane where the axis is located and the inner wall surface intersect at two intersecting lines, connecting lines at two ends of the intersecting lines and the axis form a diffusion angle alpha, wherein alpha is more than or equal to 8 degrees and less than or equal to 12 degrees, and through the arrangement, the diameter of the inner wall surface at the air outlet end is determined according to the diameter of the inner wall surface at the air inlet end and the diffusion angle, so that the optimal diffusion effect of the airflow after flowing out of the cylinder is achieved under the design goal.
Preferably, the inner wall surface has an elliptical or rectangular cross-sectional shape perpendicular to the axis.
Preferably, the minor axis of the inner wall surface of the i-th cross section has a length aiThe length of the major semi-axis of the inner wall surface of the ith section is BiThe radius of the circumscribed circle of the i-th section is Ri，Ai≤Bi≤RiThrough setting up like this, under the prerequisite that does not change the maximum size of original diffusion section of thick bamboo, and can reduce cross sectional size to a certain extent, play the pressure boost to the axial fan and carry the effect, fall the effect of making an uproar and drag reduction.
The invention also aims to provide an axial flow fan, which comprises a wind wheel and a current collector, wherein the current collector is coaxially sleeved outside the wind wheel; the wind wheel is characterized by further comprising the twisted diffusion cylinder, the cylinder body and the current collector are coaxially arranged, the air inlet end of the cylinder body is in butt joint with the air outlet of the current collector, the inner wall surface is located, the diameter of the air inlet end is equal to the inner diameter of the current collector, and the spiral direction of the spiral line is opposite to the rotating direction of the wind wheel.
Compared with the prior art, the invention has the beneficial technical effects that:
the axial flow fan adopts the twisted diffusion cylinder, because the cylinder body is twisted along a coaxial spiral line, the rotating direction of the wind wheel is opposite to the spiral direction of the spiral line, when the air flow flows into the cylinder body from the air outlet of the current collector, the air flow generates reverse secondary flow under the action of the special twisted structure of the cylinder body, the reverse secondary flow weakens the vortex generated from the air outlet of the current collector, plays a role of rectifying similar guide vanes to a certain extent, reduces the tangential air flow, increases the flow speed of axial air flow, reduces the section size to a certain extent on the premise of not changing the maximum size and the installation matching size of the original diffusion cylinder, ensures that the pressure distribution of the section is more uniform, reduces the vortex loss, further plays the roles of boosting and reducing noise on the basis of the original diffusion cylinder, and improves the efficiency by more than 2 percent through test and calculation verification, the noise is reduced by more than 2dB (A), and the reverse secondary flow disturbs the boundary layer on the inner wall surface to a certain extent to play a certain drag reduction role.
Drawings
FIG. 1 is a schematic view of a partial structure of an axial flow fan according to an embodiment of the present invention;
FIG. 2 is a schematic top view of the embodiment of the present invention with respect to FIG. 1;
FIG. 3 is a schematic front view of the embodiment of the present invention with respect to FIG. 1;
FIG. 4 is a schematic cross-sectional view E-E of FIG. 3 illustrating an embodiment of the present invention.
Wherein, the technical characteristics that each reference numeral refers to are as follows:
00-axis, 1-cylinder, 2-wind wheel, 3-helix, 4-air inlet end, 5-air outlet end, 11-inner wall surface and 12-outer wall surface.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments, but the scope of the present invention is not limited to the following embodiments.
Example 1:
referring to fig. 1-4, the present embodiment discloses a twisted diffusion tube, including a tube body 1, the tube body 1 is provided with a through vent hole along the axis 00 direction, the tube body 1 is arranged with an equal wall thickness, two ends of the tube body 1 along the axis 00 direction are respectively an air inlet end 4 and an air outlet end 5, one surface of the tube body 1 facing the axis 00 is an inner wall surface 11, one surface of the tube body 1 facing away from the axis 00 is an outer wall surface 12, the inner wall surface 11 is arranged opposite to the outer wall surface 12, and the inner wall surface 11 gradually increases in cross-sectional area perpendicular to the axis 00 from the air inlet end 4 to the air outlet end 5 along the;
the barrel 1 is twisted along a coaxial spiral line 3 and is arranged from an air inlet end 4 to an air outlet end 5 along an axis 00, the barrel 1 sequentially comprises a plurality of sections vertical to the axis 00, the plurality of sections vertical to the axis 00 of the barrel 1 do not comprise an end face located at the air inlet end 4 and an end face located at the air outlet end 5, one point on an inner wall surface 11 of an ith section forms an ith connecting line with a central point, the same point on the inner wall surface 11 of the ith +1 section is connected with the central point to form an i +1 th connecting line, and a projection of the ith connecting line and the i +1 th connecting line on a normal plane of the axis 00 forms a twist angle thetai，θi＞0°，i＝1、2、……、n，n≥2。
Because the barrel 1 is twisted along the coaxial spiral line 3, reverse secondary flow can be generated when air flow passes through the barrel 1, the reverse secondary flow weakens a main flow vortex, the rectification effect is enhanced, tangential air flow is reduced, the flow speed of axial air flow is increased, the boundary layer on the inner wall surface 11 is disturbed to a certain extent by the reverse secondary flow, the section size is reduced to a certain extent on the premise that the maximum size of the original diffusion barrel is not increased, and the extrusion of the original diffusion barrel is further pressurized, noise is reduced and drag reduction is realized.
Further, the cross-sectional shapes of the inner wall surfaces 11 at any two cross-sections are similar, and the cross-sectional shape of the inner wall surface 11 perpendicular to the axis 00 is an ellipse or a rectangle.
In one embodiment, the shape of the inner wall surface 11 on each cross section is a rectangle including a long side and a short side, and the meaning of the same point on the inner wall surface 11 on the i +1 th cross section means that: connecting the midpoint and the center of the short side of the inner wall surface 11 of the ith section to form an ith connecting line, and connecting the midpoint and the center of the same short side of the inner wall surface 11 of the (i + 1) th sectionThe point connection forms an i +1 th connecting line, and the projection of the i th connecting line and the i +1 th connecting line on a normal plane of the axis 00 forms a twist angle thetai，θiThe angle > 0 ° is merely an example of the midpoint of the short side of the inner wall surface 11, and the point on the inner wall surface 11 of the i-th cross section is not limited to the midpoint of the short side of the inner wall surface 11.
In the present embodiment, the shape of the inner wall surface 11 in each cross section is an ellipse, and the meaning of the same point on the inner wall surface 11 in the i +1 th cross section means: the major axis and the minor axis of the inner wall surface 11 of the ith section are perpendicularly intersected at the central point, the point where the positive half axis of the major axis is intersected with the inner wall surface 11 is connected with the central point to form an ith connecting line, the major axis and the minor axis of the inner wall surface 11 of the (i + 1) th section are perpendicularly intersected at the central point, the point where the positive half axis of the major axis is intersected with the inner wall surface 11 is connected with the central point to form an (i + 1) th connecting line, and the projection of the ith connecting line and the (i + 1) th connecting line on the normal plane of the axisi，θiThe angle is more than 0 degrees, only the intersection point of the inner wall surface 11 and the positive half axis of the major axis is taken as an example, one point on the inner wall surface 11 of the ith section is not limited to the intersection point of the inner wall surface 11 and the positive half axis of the major axis, and the flow guiding effect of the inner wall surface 11 with the oval section shape is better than that of the inner wall surface 11 with the rectangular section shape, so that the supercharging effect, the noise reduction effect and the drag reduction effect are better.
If the distance between any two adjacent cross sections of the cylinder 1 is equal, then theta1＝θ2＝…＝θn＞0°。
The hydraulic diameter of the inner wall surface 11 of the air inlet end 4 is D, the area of the inner wall surface 11 of the air inlet end 4 is S, the circumference of the inner wall surface 11 of the air inlet end 4 is C, D is 4S/C, the thread pitch of the spiral line 3 is L, the torsional curvature of the cylinder 1 is Tr L/D, Tr is more than or equal to 5 and less than or equal to 100, the torsional curvature of the cylinder 1 is defined by taking the torsional curvature of the cylinder 1 at the air inlet end 4 as a reference, because the cylinder 1 is arranged along the coaxial spiral line 3 in a twisted mode, when the airflow passes through the cylinder, reverse secondary flow is generated, airflow vortex flowing out of a current collector is weakened, the rectification effect is enhanced, tangential airflow flow is reduced, the axial flow speed is increased, the secondary flow disturbs a boundary layer on the inner wall surface to a certain degree, and on the premise that the maximum size of the original diffusion cylinder is not increased, the boosting, The noise and drag reduction are realized, and the torsional curvature of the cylinder body 1 in the range of 5-100 has better effect through test tests; if Tr is less than 5, namely the torsional curvature of the cylinder body 1 is too small, the strength of the reverse secondary flow generated by the airflow passing through the cylinder body 1 is too large, the generated secondary flow has a reverse effect due to too large strength, the flow loss is increased, and the cylinder body 1 cannot well play roles in pressurizing, improving the efficiency, reducing the noise and reducing the drag; if Tr is more than 100, that is, the torsional curvature of the cylinder 1 is too large, the secondary flow generated by the airflow passing through the cylinder 1 is too small, and the effects of pressurization, efficiency improvement, noise reduction and drag reduction of the cylinder 1 are not obvious.
Preferably, Tr is more than or equal to 5 and less than or equal to 30, and through test tests, the torsional curvature of the cylinder body 1 is in the range of 5-30, so that the effects of pressurization, efficiency improvement, noise reduction and drag reduction are the best.
In order to match with an air outlet of a collector, a molded line of the inner wall surface 11 at the air inlet end 4 is circular, and a diameter of the inner wall surface 11 at the air inlet end 4 is D, for convenience of design, generally, a hydraulic diameter D is D, because D is a fixed value, it is convenient to calculate a torsion rate Tr is L/D, a height of the cylinder 1 is H, H is not less than 1.5 · D and not more than 2.2 · D, in this embodiment, H is 2 · D, a height required by the cylinder 1 is determined according to a diameter of the inner wall surface 11 at the air inlet end 4, that is, the height of the cylinder 1 is determined according to an air intake, and the cylinder 1 is ensured to have sufficient height to guide airflow, so that the effects of boosting, increasing efficiency, reducing noise and reducing drag are achieved.
The molded line that the internal wall face 11 is located air-out end 5 is circular, and the plane that axis 00 place intersects in two intersecting lines with internal wall face 11, and the line of one of them intersecting line both ends forms diffusion angle alpha with axis 00, and alpha is more than or equal to 8 degrees and is less than or equal to 12 degrees, and in this embodiment, alpha is 10 degrees, and the diameter that internal wall face 11 is located air-out end 5 is decided jointly according to the diameter that internal wall face 11 is located air-in end 4 and the diffusion angle, reaches the required diffusion and the diffusion effect of the air current after flowing out from barrel 1.
The minor axis of the inner wall surface 11 of the i-th cross section has a length AiThe length of the major axis of the inner wall surface 11 of the ith cross section is Bi, and the radius of the circumscribed circle of the ith cross section is Ri，Ai≤Bi≤RiWhen A isi＝Bi＜RiThe cross-sectional shape of the inner wall surface 11 is square; when A isi＜Bi＜RiIn this case, the cross-sectional shape of the inner wall surface 11 is rectangular; when A isi＜Bi＝RiWhen the cross-sectional shape of the inner wall surface 11 is elliptical; on the premise of not changing the maximum size of the original diffusion cylinder, the cross section size can be reduced to a certain extent, and the effects of boosting, improving the efficiency, reducing noise and reducing drag are achieved for the axial flow fan; when A isi＝Bi＝RiThe cross-sectional shape of the inner wall surface 11 is circular, and the barrel 1 is subjected to subsequent twisting process treatment in production.
Example 2:
referring to fig. 1-4, a current collector is hidden in the drawings, and an axial flow fan is disclosed in this embodiment, including a wind wheel 2 and a current collector, the current collector is coaxially sleeved outside the wind wheel 2;
still include foretell distortion diffusion tube, barrel 1 and the coaxial setting of collector, and the air inlet end 4 of barrel 1 and the air outlet butt joint of collector, for the air current flows more smoothly, the internal diameter that internal wall 11 is located air inlet end 4 equals with the internal diameter of collector, and the spiral direction of helix 3 is opposite with the direction of rotation of wind wheel 2 during operation.
The axial flow fan adopts a twisted diffusion cylinder, the cylinder body 1 is twisted along a coaxial spiral line 3, the rotation direction of the wind wheel 2 is opposite to the spiral direction of the spiral line 3, when the air flow flows into the cylinder body 1 from the air outlet of the current collector, the air flow generates reverse secondary flow under the action of the cylinder body 1, the reverse secondary flow weakens vortex generated from the air outlet of the current collector, the effect similar to a guide vane is achieved to a certain extent, the tangential air flow is reduced, the flow speed of axial air flow is increased, the section size is reduced to a certain extent on the premise of not changing the maximum size and the installation matching size of the original diffusion cylinder, the pressure distribution of the section is more uniform, the vortex loss is reduced, the effects of pressurization and noise reduction are further achieved on the basis of the original diffusion cylinder, the effects are improved by more than 2 percent through experimental calculation, the noise is reduced by more than 2dB (A), and the boundary layer on the inner wall surface 11 is disturbed by the reverse, plays a certain role in reducing drag.
Variations and modifications to the above-described embodiments may occur to those skilled in the art, which fall within the scope and spirit of the above description. Therefore, the present invention is not limited to the specific embodiments disclosed and described above, and some modifications and variations of the present invention should fall within the scope of the claims of the present invention. Furthermore, although specific terms are employed herein, they are used in a generic and descriptive sense only and not for purposes of limitation.
Claims (8)
1. A twisted diffusion cylinder comprises a cylinder body (1), wherein an air inlet end (4) and an air outlet end (5) are respectively arranged at two ends of the cylinder body (1) along the direction of an axis (00), one surface, facing the axis (00), of the cylinder body (1) is an inner wall surface (11), the inner wall surface (11) is gradually increased from the air inlet end (4) to the air outlet end (5) along the axis (00) and is vertical to the cross-sectional area of the axis (00);
the air-conditioning fan is characterized in that the barrel (1) is arranged along a coaxial spiral line (3) in a twisted mode, the barrel (1) is arranged along the axis (00) from the air inlet end (4) to the air outlet end (5) and is overlapped with a fan rotating shaft after being installed, the barrel design (1) sequentially comprises a plurality of sections perpendicular to the axis (00), one point on the inner wall surface (11) of the ith section forms an ith connecting line with a central point connecting line, the same point on the inner wall surface (11) of the ith +1 section is connected with the central point to form an i +1 th connecting line, and the projection of the ith connecting line and the i +1 th connecting line on the normal plane of the axis (00) forms a twisted angle thetai，θi>0°，i＝1、2、……、n，n≥2。
2. The twisted diffuser according to claim 1, wherein the hydraulic diameter of the inner wall surface (11) at the air inlet end (4) is D, the area of the inner wall surface (11) at the air inlet end (4) is S, the circumference of the inner wall surface (11) at the air inlet end (4) is C, D is 4S/C, the pitch of the helical line (3) is L, the twist rate of the cylinder (1) is Tr L/D, and Tr is 5 ≤ 100.
3. The twisted diffuser cartridge of claim 2 wherein Tr is 5 ≦ 30.
4. The twisted diffuser barrel as claimed in claim 1, wherein the diameter of the inner wall surface (11) at the air inlet end (4) is d (the cross section of the air inlet end and the outlet of the fan collector are both round and have the same inner diameter), the height of the barrel (1) is H, and H is more than or equal to 1.5. d and less than or equal to 2.2. d.
5. The twisted diffuser cartridge of claim 4 wherein the plane of the axis (00) intersects the inner wall surface (11) at two intersecting lines, wherein a line connecting the two ends of one of the intersecting lines forms a diffusion angle α with the axis, wherein α is 8 ° or more and 12 ° or less.
6. The twisted diffuser cartridge according to claim 1, wherein the inner wall surface (11) is elliptical or rectangular in cross-sectional shape perpendicular to the axis (00).
7. The twisted diffuser basket according to claim 6, wherein the minor axis of the inner wall surface (11) of the i-th cross-section has a length AiThe length of the major axis of the inner wall surface (11) of the ith section is BiThe radius of the circumscribed circle of the i-th section is Ri，Ai≤Bi≤Ri。
8. An axial flow fan comprises a wind wheel (2) and a current collector, wherein the current collector is coaxially sleeved outside the wind wheel (2);
the twisted diffusion tube is characterized by further comprising the twisted diffusion tube according to any one of claims 1 to 7, wherein the tube body (1) and the current collector are coaxially arranged, an air inlet end (4) of the tube body (1) is in butt joint with an air outlet of the current collector, the diameter of the inner wall surface (11) at the air inlet end (4) is equal to the inner diameter of the current collector, and the spiral direction of the spiral line (3) is opposite to the rotation direction of the wind wheel (2).
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| CN202110017722.8A CN112610530A (en) | 2021-01-07 | 2021-01-07 | Axial flow fan of distortion diffuser and applied this diffuser |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113623249A (en) * | 2021-08-26 | 2021-11-09 | 西安交通大学 | Parallel type efficient axial flow fan with partition plates arranged in rectangular outlet diffusion cylinder |
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| CN113623249A (en) * | 2021-08-26 | 2021-11-09 | 西安交通大学 | Parallel type efficient axial flow fan with partition plates arranged in rectangular outlet diffusion cylinder |
| CN113623249B (en) * | 2021-08-26 | 2022-10-28 | 西安交通大学 | Parallel type efficient axial flow fan with partition plates arranged in rectangular outlet diffusion cylinder |
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Application publication date: 20210406 |