CN109083865B - Forward multi-wing centrifugal fan and impeller thereof - Google Patents
Forward multi-wing centrifugal fan and impeller thereof Download PDFInfo
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- CN109083865B CN109083865B CN201810935048.XA CN201810935048A CN109083865B CN 109083865 B CN109083865 B CN 109083865B CN 201810935048 A CN201810935048 A CN 201810935048A CN 109083865 B CN109083865 B CN 109083865B
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- impeller
- middle disc
- upper cover
- lower cover
- blade
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Classifications
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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
- F04D29/26—Rotors specially for elastic fluids
- F04D29/28—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps
- F04D29/281—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps for fans or blowers
- F04D29/282—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps for fans or blowers the leading edge of each vane being substantially parallel to the rotation axis
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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
- F04D25/00—Pumping installations or systems
- F04D25/02—Units comprising pumps and their driving means
- F04D25/08—Units comprising pumps and their driving means the working fluid being air, e.g. for ventilation
-
- 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
- F04D29/26—Rotors specially for elastic fluids
- F04D29/28—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps
- F04D29/30—Vanes
-
- 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
- F04D29/666—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps by means of rotor construction or layout, e.g. unequal distribution of blades or vanes
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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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/72—Wind turbines with rotation axis in wind direction
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The invention discloses a forward multi-wing centrifugal fan and an impeller thereof, wherein the impeller comprises an impeller upper cover, an impeller lower cover and an impeller middle disc, inclined blades are arranged between the impeller middle disc and the impeller upper cover and between the impeller middle disc and the impeller lower cover, and the suction surfaces of all the inclined blades incline towards the direction of the impeller middle disc. According to the invention, the included angle between the suction surface of the inclined blade in the impeller and the middle disc of the impeller is smaller than 90 degrees, and the included angle between the pressure surface and the middle disc of the impeller is larger than 90 degrees, so that the pressure surface can apply acting force away from the middle disc of the impeller to the air flow in the air flow process, the aggregation of the air to the middle disc of the impeller is reduced, the air flow is more uniformly distributed in the axial direction, the occurrence of boundary layer separation phenomenon is reduced, the working efficiency of a fan is further improved, the generation of vortex is reduced, and the noise of the fan is reduced.
Description
Technical Field
The invention relates to the technical field of fluid machinery, in particular to an impeller. The invention also relates to a forward multi-wing centrifugal fan comprising the impeller.
Background
The forward multi-wing centrifugal fan is an axial air inlet fan, the impeller of the forward multi-wing centrifugal fan is large in width and high in height, and air flows into the fan along the axial direction, is pressurized by the impeller and is discharged along the radial direction. In the process of impeller rotation, the air flow is unevenly distributed along the axial speed, so that in a partial area of the blade, the air flow enters the blade channel area at a larger attack angle, a vortex is formed on the suction surface of the rear edge of the blade, a serious boundary layer separation phenomenon is caused, the working efficiency of a fan is further influenced, and the noise of the fan is increased.
Therefore, how to reduce the occurrence of the boundary layer separation phenomenon on the impeller is a technical problem that needs to be solved by those skilled in the art.
Disclosure of Invention
The invention aims to provide an impeller which can adjust the speed distribution of an airflow in the axial direction and reduce the occurrence of boundary layer separation phenomenon. It is another object of the present invention to provide a forward multi-wing centrifugal fan comprising the impeller described above.
In order to achieve the above purpose, the invention provides an impeller of a forward multi-wing centrifugal fan, which comprises an impeller upper cover, an impeller lower cover and an impeller middle disc, wherein inclined blades are arranged between the impeller middle disc and the impeller upper cover and between the impeller middle disc and the impeller lower cover, and the suction surfaces of all the inclined blades incline towards the direction of the impeller middle disc.
Preferably, the first circumferential angular deviation of the leading edge of the inclined blade is 0 to 30 °, and the second circumferential angular deviation of the trailing edge of the inclined blade is 0 to 30 °.
Preferably, the first circumferential angular deviation is equal to the second circumferential angular deviation.
Preferably, a plurality of layers of impeller middle discs are arranged between the impeller upper cover and the impeller lower cover, and inclined blades are respectively arranged between the impeller upper cover and the impeller lower cover and the impeller middle discs adjacent to the impeller upper cover and the impeller lower cover.
Preferably, the height of the inclined blade is 30% -70% of the height between the impeller upper cover and the impeller lower cover.
Preferably, the impeller middle disc comprises a first impeller middle disc and a second impeller middle disc, the first impeller middle disc is positioned close to one side of the impeller upper cover, the second impeller middle disc is positioned close to one side of the impeller lower cover, and vertical blades are arranged between the first impeller middle disc and the second impeller middle disc.
Preferably, the distance between the first impeller middle disc and the impeller upper cover is equal to the distance between the second impeller middle disc and the impeller lower cover.
Preferably, the impeller middle disc comprises a first impeller middle disc, a second impeller middle disc and a third impeller middle disc, and the inclined blades are arranged between the impeller upper cover and the first impeller middle disc and between the third impeller middle disc and the impeller lower cover.
Preferably, the distance between the second impeller middle disc and the impeller upper cover is equal to the distance between the second impeller middle disc and the impeller lower cover, and the distance between the first impeller middle disc and the second impeller middle disc is equal to the distance between the third impeller middle disc and the second impeller middle disc.
The invention also provides a forward multi-wing centrifugal fan, which comprises any impeller.
The impeller provided by the invention comprises an impeller upper cover, an impeller lower cover and an impeller middle plate, wherein inclined blades are arranged between the impeller middle plate and the impeller upper cover and between the impeller middle plate and the impeller lower cover, the suction surfaces of the inclined blades incline towards the impeller middle plate, namely the included angle between the suction surfaces of the inclined blades and the impeller middle plate is smaller than 90 degrees.
In the process of the air flow flowing in the impeller, the air at the impeller upper cover and the impeller lower cover has larger axial velocity, the direction of the axial velocity of the air flow at the impeller upper cover is downward, and the axial velocity of the air flow at the impeller lower cover is upward. Therefore, in the flowing process, the gas gathers near the middle disc of the impeller, so that the flow speed of the gas near the middle disc of the impeller is higher, the boundary layer separation is serious, a low-pressure area is generated at the upper cover of the impeller and the lower cover of the impeller, and the gas flow surge is easy to occur.
According to the invention, the included angle between the suction surface of the inclined blade and the middle disc of the impeller is smaller than 90 degrees, the included angle between the pressure surface and the middle disc of the impeller is larger than 90 degrees, and in the gas flow process, the pressure surface can apply acting force to the gas flow far away from the middle disc of the impeller, so that the gas is reduced to gather towards the middle disc of the impeller, the gas flow is more uniformly distributed in the axial direction, the occurrence of boundary layer separation phenomenon is reduced, the working efficiency of the fan is further improved, the generation of vortex is reduced, and the noise of the fan is reduced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present invention, and that other drawings can be obtained according to the provided drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic view of an impeller according to the present invention;
fig. 2 is a schematic view of the structure of the inclined blade in fig. 1.
Wherein reference numerals in fig. 1 and 2 are:
the impeller comprises an impeller upper cover 1, an impeller lower cover 2, an impeller middle disc 3, upper inclined blades 4, lower inclined blades 5, a first circumferential angle deviation alpha and a second circumferential angle deviation beta.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The present invention will be further described in detail below with reference to the drawings and detailed description for the purpose of enabling those skilled in the art to better understand the aspects of the present invention.
Referring to fig. 1 and 2, fig. 1 is a schematic structural diagram of an impeller according to the present invention; fig. 2 is a schematic view of the structure of the inclined blade in fig. 1.
The impeller of the forward multi-wing centrifugal fan provided by the invention, as shown in figure 1, comprises an impeller upper cover 1, an impeller lower cover 2 and an impeller middle disc 3 which are coaxially arranged. The impeller upper cover 1 and the impeller middle disc 3 are annular, and inclined blades are arranged between the impeller upper cover 1 and the impeller lower cover 2. The inclined blades comprise upper inclined blades and lower inclined blades, wherein the upper inclined blades are positioned between the impeller middle disc 3 and the impeller upper cover 1, and the lower inclined blades are positioned between the impeller middle disc 3 and the impeller lower cover 2. The pressure surfaces of the inclined blades are inclined towards the impeller mid-disc 3, i.e. the angle between the suction surfaces of the inclined blades and the impeller mid-disc 3 is less than 90 °. Obviously, the angle between the pressure surface of the inclined blade and the disk 3 in the impeller is greater than 90 °.
As shown in fig. 2, the first circumferential angular deviation α of the leading edge of the inclined blade is 0 to 30 °, and the second circumferential angular deviation β of the trailing edge of the inclined blade is 0 to 30 °. The circumferential angle deviation is a circumferential angle corresponding to an arc between a generatrix of the inclined blade and two intersections of the impeller middle disc 3 and the impeller upper cover 1 or between a generatrix of the inclined blade and two intersections of the impeller middle disc 3 and the impeller lower cover 2. The first circumferential angle deviation alpha and the second circumferential angle deviation beta can be selected by users according to the needs.
Taking the above inclined blade as an example, the structure thereof can be obtained by:
and extracting the bone lines of the planar two-dimensional blade shapes of the blades, respectively projecting the bone lines to the impeller upper cover 1 and the impeller middle disc 3, wherein the two projections are positioned on the same axis, and rotating the projection on the impeller upper cover 1 around the axis of the impeller towards the direction of the suction surface by circumferential angle deviation to obtain the inclined blade bone lines of the impeller upper cover 1. And then determining the outline of the inclined blade according to the bone line of the inclined blade, and connecting the outline of the inclined blade on the impeller upper cover 1 and the impeller middle disc 3 through the straight line surface, so as to obtain the structure of the inclined blade.
In the rotation process of the bone line projection on the impeller upper cover 1, the first circumferential angle deviation alpha and the second circumferential angle deviation beta which are rotated by the front edge and the rear edge are generally equal, and of course, a user can select different first circumferential angle deviation alpha and second circumferential angle deviation beta according to the needs.
The profile of the inclined blade can be obtained by widening the bone line, or by connecting the front edge and the rear edge of the bone line by adopting a single-segment circular arc, a multi-segment circular arc or a spline curve similar to the bone line. Of course, the user may also obtain the profile of the inclined blade by other means, not limited herein.
Because the inclined blades are arranged in the impeller, axial force can be generated in the rotation process of the impeller, and the inclined blades on two sides of the impeller middle disc 3 are symmetrically distributed relative to the plane of the impeller middle disc 3 in order to reduce the axial force.
In this embodiment, set up the inclined vane in the impeller, the contained angle between inclined vane pressure face and impeller middle disc 3 is the obtuse angle, and when the impeller rotated, the inclined vane can exert the effort of keeping away from impeller middle disc 3 to the air current, avoids gas to gather near impeller middle disc 3, reduces the flow velocity of gas near impeller middle disc 3, makes the velocity of flow distribution of gas in the blade passageway more even, less boundary layer separation's phenomenon emergence.
The impeller can be provided with a plurality of impeller middle discs 3 along the axial direction, and the impeller is divided into a plurality of layers by the impeller middle discs 3, so that the speed distribution of the air flow along the axial direction is more uniform. The inclined blades are disposed in the blade passages immediately adjacent to the impeller upper cover 1 and the impeller lower cover 2. The height of the inclined blades is 30% -70% of the height between the impeller upper cover 1 and the impeller lower cover 2.
In a specific embodiment of the invention, the impeller middle disc 3 comprises a first impeller middle disc and a second impeller middle disc which are distributed along the axial direction, wherein the first impeller middle disc and the second impeller middle disc are both positioned between the impeller upper cover 1 and the impeller lower cover 2, the first impeller middle disc is positioned at one side close to the impeller upper cover 1, upper inclined blades are arranged between the impeller upper cover 1 and the first impeller middle disc, and the included angle between the pressure surface of each upper inclined blade and the first impeller middle disc is an obtuse angle; the lower impeller middle disc 3 is positioned at one side close to the impeller lower cover 2, lower inclined blades are arranged between the impeller lower cover 2 and the second impeller middle disc, and the included angle between the pressure surface of each lower inclined blade and the second impeller middle disc is an obtuse angle. Vertical blades are arranged between the middle disc of the first impeller and the middle disc of the second impeller.
Optionally, the distance between the first impeller middle disc and the impeller upper cover 1 is equal to the distance between the second impeller middle disc and the impeller lower cover 2, the height of the vertical blades is 30% -70% of the height between the impeller upper cover 1 and the impeller lower cover 2, the proportion of the corresponding inclined blades in the impeller height is 70% -30%, and the proportion of the upper inclined blades and the lower inclined blades is the same. Of course, the user may also have the upper or lower inclined blades occupy a larger proportion as desired, without limitation.
In this embodiment, the inclined blade and the vertical blade are used simultaneously, and because the manufacturing cost of the inclined blade is high, the area with the maximum axial velocity of the air flow is adjusted by the inclined blade, and the manufacturing cost of the impeller can be reduced by adopting the vertical blade in other areas.
In another embodiment of the present invention, the impeller middle disc 3 comprises a first impeller middle disc, a second impeller middle disc and a third impeller middle disc which are coaxially arranged, and all three are located between the impeller upper cover 1 and the impeller lower cover 2.
Specifically, the distance between the second impeller middle disc and the impeller upper cover 1 is equal to the distance between the first impeller middle disc and the second impeller middle disc is equal to the distance between the second impeller middle disc and the third impeller middle disc, and the inclined blades are arranged between the impeller upper cover 1 and the first impeller middle disc and between the third impeller middle disc and the impeller lower cover 2.
The upper inclined blades are arranged between the first impeller middle disc and the impeller upper cover 1, and the height between the first impeller middle disc and the impeller upper cover 1 is 15% -35% of the height between the impeller upper cover 1 and the impeller lower cover 2; the lower inclined blades are arranged between the third impeller middle disc and the impeller lower cover 2, and the height between the third impeller middle disc and the impeller lower cover 2 is 15% -35% of the height between the impeller upper cover 1 and the impeller lower cover 2.
Because the air flow between the first impeller middle disc and the second impeller middle disc also has smaller axial velocity gradient, a first inclined blade and a second inclined blade can be respectively arranged between the first impeller middle disc and the second impeller middle disc and between the second impeller middle disc and the third impeller middle disc, the inclined direction of the first inclined blade is the same as that of the upper inclined blade, and the circumferential angle deviation of the first inclined blade is smaller than that of the upper inclined blade; the second inclined blades and the first inclined blades are symmetrically distributed about the middle disk of the second impeller. Of course, vertical vanes may also be provided between the first impeller mid-disk and the third impeller mid-disk.
In this embodiment, the impeller middle disc 3 includes a first impeller middle disc, a second impeller middle disc and a third impeller middle disc, the three divide the impeller into four layers of blade channels, an upper inclined blade and a lower inclined blade are respectively arranged in the blade channels close to the impeller upper cover 1 and the impeller lower cover 2, and a first inclined blade and a second inclined blade are arranged in the blade channels on two sides of the second impeller middle disc. Because in the upper and lower two-layer blade passageway, the gradient of air current axial velocity is great, and air current axial velocity is less in the middle two-layer blade passageway, and the circumference angle deviation of upper inclined blade and lower inclined blade is greater than the circumference angle deviation of first inclined blade and second inclined blade can make the speed distribution of air current in axial more even, further improves fan efficiency, reduces fan noise.
The invention also provides a forward multi-wing centrifugal fan, which comprises any impeller; other parts of the multi-wing centrifugal fan can refer to the prior art, and are not described in detail herein.
It should be noted that in this specification relational terms such as first and second are used solely to distinguish one entity from another entity without necessarily requiring or implying any actual such relationship or order between such entities.
The forward multi-wing centrifugal fan and the impeller thereof provided by the invention are described in detail. The principles and embodiments of the present invention have been described herein with reference to specific examples, the description of which is intended only to facilitate an understanding of the method of the present invention and its core ideas. It should be noted that it will be apparent to those skilled in the art that various modifications and adaptations of the invention can be made without departing from the principles of the invention and these modifications and adaptations are intended to be within the scope of the invention as defined in the following claims.
Claims (2)
1. The impeller of the forward multi-wing centrifugal fan comprises an impeller upper cover (1), an impeller lower cover (2) and an impeller middle disc (3), and is characterized in that an upper inclined blade and a lower inclined blade are arranged between the impeller middle disc (3) and the impeller upper cover (1) and between the impeller lower cover (2), and an included angle between the suction surfaces of the upper inclined blade and the lower inclined blade and the impeller middle disc (3) is smaller than 90 degrees;
the first circumferential angle deviation of the front edges of the upper inclined blades and the lower inclined blades is 0-30 degrees, the second circumferential angle deviation of the rear edges of the upper inclined blades and the lower inclined blades is 0-30 degrees, and the first circumferential angle deviation is equal to the second circumferential angle deviation;
a plurality of layers of impeller middle discs (3) are arranged between the impeller upper cover (1) and the impeller lower cover (2), and upper inclined blades and lower inclined blades are respectively arranged between the impeller upper cover (1) and the impeller lower cover (2) and the impeller middle discs (3) adjacent to the impeller upper cover and the impeller lower cover;
the impeller middle disc (3) comprises a first impeller middle disc, a second impeller middle disc and a third impeller middle disc, and the upper inclined blades and the lower inclined blades are respectively arranged between the impeller upper cover (1) and the first impeller middle disc and between the third impeller middle disc and the impeller lower cover (2);
the distance between the second impeller middle disc and the impeller upper cover (1) is equal to the distance between the second impeller middle disc and the impeller lower cover (2), and the distance between the first impeller middle disc and the second impeller middle disc is equal to the distance between the third impeller middle disc and the second impeller middle disc;
the upper inclined blades are arranged between the first impeller middle disc and the impeller upper cover (1), and the height between the first impeller middle disc and the impeller upper cover (1) is 15% -35% of the height between the impeller upper cover (1) and the impeller lower cover (2); the lower inclined blades are arranged between the third impeller middle disc and the impeller lower cover (2), and the height between the third impeller middle disc and the impeller lower cover (2) is 15% -35% of the height between the impeller upper cover (1) and the impeller lower cover (2);
the first impeller middle disc and the second impeller middle disc and the third impeller middle disc are respectively provided with a first inclined blade and a second inclined blade, the inclined direction of the first inclined blade is the same as that of the upper inclined blade, and the circumferential angle deviation of the first inclined blade is smaller than that of the upper inclined blade; the second inclined blades and the first inclined blades are symmetrically distributed about the middle disk of the second impeller.
2. A forward multi-wing centrifugal fan comprising the impeller of claim 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201810935048.XA CN109083865B (en) | 2018-08-16 | 2018-08-16 | Forward multi-wing centrifugal fan and impeller thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810935048.XA CN109083865B (en) | 2018-08-16 | 2018-08-16 | Forward multi-wing centrifugal fan and impeller thereof |
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| CN109083865A CN109083865A (en) | 2018-12-25 |
| CN109083865B true CN109083865B (en) | 2023-08-22 |
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| CN111350691A (en) * | 2020-04-17 | 2020-06-30 | 山东攀峰通风设备有限公司 | High-pressure centrifugal fan impeller |
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