CN210889451U - Centrifugal fan blade and centrifugal fan with same - Google Patents
Centrifugal fan blade and centrifugal fan with same Download PDFInfo
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- CN210889451U CN210889451U CN201921689988.1U CN201921689988U CN210889451U CN 210889451 U CN210889451 U CN 210889451U CN 201921689988 U CN201921689988 U CN 201921689988U CN 210889451 U CN210889451 U CN 210889451U
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Abstract
The utility model provides a centrifugal fan blade and have its centrifugal fan, including the blade main part, the blade main part has blade leading edge and blade trailing edge, and the blade main part is circular arc platelike, and the blade leading edge is the wave setting, and at least one side is formed with the section of sweeping forward, and the blade trailing edge is the zigzag setting, and at least one side is formed with the section of sweepback. A centrifugal fan is also provided. The utility model discloses a unsmooth wave type sweepforward leading edge and sawtooth pattern sweepback trailing edge for the vortex of blade leading edge and trailing edge department side surface wall no longer interferes each other, and then has reduced pressure pulsation's production, sweepforward section and sweepback section make the leading edge and the trailing edge extend the noise source phase angle of degree direction stagger each other respectively simultaneously, thereby make local noise can not merge the increase; meanwhile, the flow of the boundary layer is delayed by the sawtooth tail edge, the influence area of the separation area and the wake area is enlarged, the reverse vortex pair is directly crushed after colliding with the original forward vortex pair, and the pneumatic noise of the tail edge is greatly reduced. In addition, the pressure, efficiency and other performances can be synchronously improved.
Description
Technical Field
The utility model relates to a ventilation equipment technical field especially relates to a centrifugal fan blade and have its centrifugal fan.
Background
The centrifugal ventilator has the characteristics of large flow, high pressure and low noise, so that the centrifugal ventilator is widely applied to central air conditioners, rail transit vehicle-mounted air conditioners and kitchen smoke exhaust systems. In some demanding places of use, such as rail transit vehicle air conditioners, the demand for the size of the air conditioner is smaller and smaller, but the required air volume and air pressure are higher and higher, and the noise of the centrifugal fan is required to be as low as possible. Therefore, the centrifugal fan tends to be miniaturized, speeded up, and made low in noise. The fan impeller rotating speed of the traditional centrifugal ventilator is difficult to further reduce, and the diameter of the impeller is difficult to further increase, so the performance of the centrifugal ventilator is generally improved by changing the structure of the blades. However, although the existing blade structure can reduce the noise of the centrifugal ventilator to some extent, the wind pressure and efficiency of the centrifugal ventilator are reduced simultaneously.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the first technical problem that a centrifugal fan blade that not only can make an uproar but also can guarantee pressure and efficiency is provided to above-mentioned prior art current situation.
The utility model aims to solve the second technical problem that provide a centrifugal fan that not only can fall and to fall and can also guarantee pressure and efficiency to above-mentioned prior art current situation.
The utility model provides a technical scheme that above-mentioned first technical problem adopted does: the blade of the centrifugal fan comprises a blade main body, wherein the blade main body is provided with a blade front edge and a blade rear edge, the blade main body is in an arc plate shape, the blade front edge is arranged in a wave shape, at least one side of the blade front edge is provided with a forward swept section, the blade rear edge is arranged in a sawtooth shape, and at least one side of the blade rear edge is provided with a backward swept section.
In one embodiment, the ratio of the length of the forward swept section of the blade leading edge to the length of the blade leading edge is 1: 3. So that the arrangement is that the air conditioner is arranged,
in one embodiment, the forward-swept segment has a forward-swept angle of 3 ° to 5 ° with respect to the leading edge of the blade.
In one embodiment, the ratio of the length of the swept back section of the blade trailing edge to the length of the blade trailing edge is 1: 3. So that the arrangement is that the air conditioner is arranged,
in one embodiment, the swept-back section has a swept-back angle of 3 ° to 5 ° with respect to the trailing edge of the blade.
In one embodiment, the ratio of the wave height of the leading edge of the vane to the width of the main body of the vane is 0.025-0.04; and/or the presence of a catalyst in the reaction mixture,
the ratio of the wave width of the blade leading edge to the width of the blade main body is 0.155-0.17.
In one embodiment, the ratio of the tooth height of the blade trailing edge to the width of the blade main body is 0.05-0.07; and/or the presence of a catalyst in the reaction mixture,
the ratio of the width of the root of the blade trailing edge to the width of the blade main body is 0.03-0.04.
In one embodiment, adjacent sawteeth on the rear edge of the blade have a tooth space distance, and the ratio of the tooth space distance to the width of the blade main body is 0.085-0.105.
In one embodiment, the centrifugal fan blade further comprises a blade lug connected to one side or two sides of the blade main body, and one blade lug is connected to one side of the blade main body, or two blade lugs are connected to one side of the blade main body.
The utility model provides a technical scheme that above-mentioned second technical problem adopted does: there is provided a centrifugal fan comprising an impeller and a centrifugal fan blade as claimed in any preceding claim, the centrifugal fan blade being connected to the impeller.
Compared with the prior art, the beneficial effects of the utility model reside in that:
according to the centrifugal fan blade and the centrifugal fan, the concave-convex wave type forward swept front edge and the sawtooth type backward swept tail edge are adopted, so that vortexes on the side surface wall surfaces at the front edge and the rear edge of the blade are not interfered with each other any more, the generation of pressure pulsation is reduced, and meanwhile, the forward swept section and the backward swept section respectively stagger the phase angles of noise sources in the extension degree direction of the front edge and the rear edge, so that local noise is not combined and increased; meanwhile, the flow of the boundary layer is delayed by the sawtooth tail edge, the influence area of the separation area and the wake area is enlarged, the reverse vortex pair is directly crushed after colliding with the original forward vortex pair, and the pneumatic noise of the tail edge is greatly reduced. In addition, the pressure, efficiency and other performances can be synchronously improved.
Drawings
FIG. 1 is a schematic perspective view of a centrifugal fan blade according to an embodiment;
FIG. 2 is another perspective view of the centrifugal fan blade of FIG. 1;
FIG. 3 is a schematic view of a centrifugal fan blade according to an embodiment shown in a first perspective;
FIG. 4 is a schematic view of the centrifugal fan blade of FIG. 3 from a second perspective;
FIG. 5 is a schematic view of the centrifugal fan blade of FIG. 3 from a third perspective;
FIG. 6 is a schematic view of the centrifugal fan blade of FIG. 3 from a fourth perspective;
FIG. 7 is an enlarged partial schematic view of portion B of the centrifugal fan blade shown in FIG. 4;
fig. 8 is a partially enlarged schematic view of a portion a of the centrifugal fan blade shown in fig. 4.
Reference numerals:
a centrifugal fan blade-100; a blade body-110; a blade leading edge-111; forward swept segment-111 a; a blade trailing edge-112; a sweep-back segment-112 b; leaf ear-120.
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 efforts belong to the protection scope of the present invention.
It should be noted that when an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. When an element is referred to as being "secured to" another element, it can be directly secured to the other element or intervening elements may also be present.
It should be understood that in the description of the present invention, the orientation or positional relationship indicated by the terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal, top, bottom", etc. are usually based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplification of description, and in the case of not making a contrary explanation, these terms do not indicate and imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the scope of the present invention; the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
Referring to fig. 1 and fig. 2, fig. 1 is a schematic perspective view of a centrifugal fan blade according to the preferred embodiment, and fig. 2 is a schematic perspective view of another centrifugal fan blade shown in fig. 1.
The centrifugal fan blade 100 includes a blade body 110 and a blade lug 120, wherein the blade body 110 is substantially in the shape of an arc plate and has a blade leading edge 111 and a blade trailing edge 112, the blade lug 120 is connected to one side or both sides of the blade body 110, one blade lug 120 may be connected to one side of the blade body 110, that is, a single-side single-lug structure, or two blade lugs 120 may be connected to one side of the blade body 110, that is, a single-side double-lug structure.
The centrifugal fan blade 100 is simple to form and low in cost, can be used for a centrifugal fan, and is widely applied to various central air conditioners, rail transit vehicle-mounted air conditioners, kitchen smoke exhaust systems and the like.
In the case of a centrifugal fan, which relies on input mechanical energy to accelerate gas by using an impeller rotating at a high speed to increase the pressure of the gas, the existing centrifugal fan generally includes a casing, a main shaft, an impeller, a bearing transmission mechanism, and a motor. The impeller part consists of blades, a curve-shaped front disc and a flat plate rear disc.
Because the size of the existing fan is required to be smaller and smaller, but the requirements on parameters such as air volume, air pressure and the like are larger and larger, and meanwhile, the noise of the existing fan needs to be further reduced, while the rotating speed of an impeller of the existing centrifugal fan is difficult to further reduce, and the diameter of the impeller cannot be further increased, various performances of the fan are usually adjusted by changing the structure of a fan blade.
In the forward multi-wing centrifugal ventilator, gas enters the impeller from one side of the outer edge of the rotor and then passes through the inside of the impeller and is discharged from the other side, and the gas is acted by the force of the blades twice in the impeller. Under the same performance condition, the size is smaller, the rotating speed is lower and the efficiency is higher. Since the axial width can be chosen arbitrarily without affecting the flow conditions of the gas, the gas flow remains uniform over the entire rotor width. For the forward multi-wing centrifugal fan, on the basis of the structure of the arc plate type blade, the beveling treatment of the fan blade can reduce the noise by 1.5dB (A), but the pressure and the efficiency of the fan can also be reduced synchronously, and the reduction can be about 3% at most on the original basis.
The existing use requirement of the forward multi-wing centrifugal ventilator is to further reduce the noise of 4dB (A) on the basis of the noise of the traditional straight-blade fan and ensure the performances of the fan such as pressure, efficiency and the like.
In the fan blade 100 of the present embodiment, the blade body 110 is substantially in the shape of an arc plate and is made of carbon steel, stainless steel, or aluminum alloy. The blade leading edge 111 is arranged in a wave shape, a forward swept section 111a is formed on at least one side of the blade leading edge 111, the blade trailing edge 112 is arranged in a sawtooth shape, and a backward swept section 112b is formed on at least one side of the blade trailing edge 112.
The fan blade 100 adopts a composite bionic design, a passive flow control method is adopted on the basis of the traditional arc plate type full-straight blade, and the front edge 111 of the blade is designed into a concave wave shape and a convex wave shape which extend along the length direction by utilizing the bionic principle of a concave-convex bump at the edge of a fin-shaped limb of a humpback whale; designing the blade trailing edge 112 into a zigzag structure extending along the length direction by using the bird wing tail characteristic principle; meanwhile, the front edge and the rear tail edge at the two ends of the blade are respectively subjected to forward-swept and backward-swept beveling treatment so as to realize the effects of noise reduction, pressurization and synergy.
The front edge 111 of the blade is wavy and designed to simulate humps of a humpback whale, the formed vortex can generate larger buoyancy, the friction force is reduced, the separation phenomenon of air flow at an inlet and an outlet can be effectively weakened, the flow loss is reduced, the operation efficiency is improved, the phase angle of the noise of the front edge 111 of the blade in the length direction of the noise is periodically and effectively staggered, and the noise is not superposed in the length direction of the noise, so that the noise of the front edge is reduced.
Wherein, the buoyancy of the blade leading edge 111 structure is verified to be increased by about 8%, and the friction is verified to be decreased by about 32%.
The blade tail edge area utilizes the principle that the sawtooth tail edge of a mute flying owl can influence the tail trace and the tail vortex characteristics of a wing so as to achieve the purpose of noise reduction, the blade tail edge area is designed into a sawtooth structure which is periodically distributed along the length direction of the blade tail edge area, the tail edge noise phase angle is effectively and periodically staggered, fluid between the tail edge sawtooth teeth is induced by the pressure difference between the suction surface and the pressure surface of the sawtooth tail edge blade to generate secondary turbulent jet flow, and a vortex pair rotating in the reverse direction is formed on the suction surface side. The above factors can affect the aerodynamic characteristics and the streaming flow field characteristics of the sawtooth trailing edge blade, the trailing edge sawtooth delays the flow of the boundary layer, the influence area of the separation region and the trailing region is enlarged, the reverse vortex pair is directly crushed after colliding with the original forward vortex pair, and the effect of the above factors on the reduction of the trailing edge aerodynamic noise is obvious.
The whole blade is changed from an original full-straight structure into a chamfered structure with forward swept front edges and backward swept tail edges at two ends, so that phase angles of noise at the front edge 111 and the rear edge 112 of the blade in the length direction of the blade are sequentially staggered, vortexes on the side surface wall surfaces are not mutually connected and interfered, pressure pulsation is reduced, and noise reduction is facilitated. Meanwhile, the design of forward sweep and backward sweep increases the axial static pressure gradient distribution of the blade main body 110, which is beneficial to forming the axial static pressure gradient pointing to the middle part of the flow channel, can reduce the accumulation of low-energy fluid clusters at the annular walls of the front disk and the rear disk of the impeller, improves the internal flow structure of the moving blade, and effectively improves the operating efficiency and pressure of the blade main body 110 compared with a full straight blade.
Referring to fig. 3 to fig. 6, fig. 3 is a schematic structural view of a centrifugal fan blade according to an embodiment of the present invention at a first viewing angle; FIG. 4 is a schematic view of the centrifugal fan blade of FIG. 3 from a second perspective; FIG. 5 is a schematic view of the centrifugal fan blade of FIG. 3 from a third perspective; fig. 6 is a schematic structural view of the centrifugal fan blade shown in fig. 3 at a fourth viewing angle.
In one embodiment, the ratio of the length of the forward swept section 111a of the blade leading edge 111 to the length of the blade leading edge 111 is 1: 3. In the preferred embodiment, both sides of the blade leading edge 111 are formed with forward-swept sections 111a, and the forward-swept angle of the two forward-swept sections 111a relative to the blade leading edge 111 is preferably, but not limited to, 3 ° to 5 °. In other embodiments, the forward swept segment 111a may be formed on only a single side of the blade leading edge 111.
In one embodiment, the ratio of the length of the swept back section 112b of the blade trailing edge 112 to the length of the blade trailing edge 112 is 1: 3. In the preferred embodiment, the two sides of the blade trailing edge 112 are both formed with the swept-back sections 112b, and the swept-back angle of the two swept-back sections 112b relative to the blade trailing edge 112 is preferably, but not limited to, 3 ° to 5 °. In other embodiments, the swept-back section 112b may be formed on only a single side of the blade trailing edge 112.
Referring to fig. 7, fig. 7 is a partially enlarged view of a portion B of the centrifugal fan blade shown in fig. 4. Wave height h of blade leading edge 1111And the width w of the blade body 1101The ratio of the ratio is 0.025 to 0.04; and/or the wave width lambda of the leading edge 111 of the blade and the width w of the blade body 1101The ratio of the ratio is 0.155 to 0.17.
Referring to fig. 8, fig. 8 is a partially enlarged view of a portion a of the centrifugal fan blade shown in fig. 4. Tooth height h of blade trailing edge 1122And the width w of the blade body 1101The ratio of the ratio is 0.05 to 0.07; and/or root width w of blade trailing edge 1122And the width w of the blade body 1101The ratio of the ratio is 0.03 to 0.04.
Further, adjacent sawteeth of the blade trailing edge 112 have a tooth space e therebetween, which is equal to the width w of the blade main body 1101The ratio of the ratio is 0.085 to 0.105.
In the fan blade 110, the concave-convex wave-shaped forward swept section 111a and the sawtooth-shaped backward swept section 112b provided by this embodiment, by forming a reverse vortex with suitable strength to transport momentum to the boundary layer, and at the same time, the concave-convex wave-shaped forward swept section 111a and the sawtooth-shaped backward swept section 112b reduce the negative pressure gradient of the blade along the length direction of the blade and the chord direction in the convex peak plane, so that the flow still shows an attached state when the flow stalls deeply, thereby suppressing fluid separation to a certain extent, and simultaneously, the forward and backward sweep design at the two ends of the blade increases the static pressure gradient distribution at the front disk and the rear disk, which is beneficial to forming a radial static pressure gradient pointing to the middle of the flow channel, so as to reduce the accumulation of low-energy fluid at the annular wall of the front disk and the rear disk, improve the internal flow structure of the moving blade, and improve the pressure and efficiency of the blade during operation.
Specifically, through verification, under the condition that the original area of the blade is not changed, the aerodynamic noise of the centrifugal fan blade is reduced by more than 4dB (A) compared with that of the traditional full-straight blade, the pressure can be increased by more than 2.5%, and meanwhile, the efficiency can be synchronously increased by more than 2%. After the forward multi-wing centrifugal fan adopts a composite bionic design, the levels of aerodynamic noise, pressure and efficiency of the impeller are comprehensively improved, and the overall economy is better.
The composite bionic blade provided by the embodiment can further reduce noise. The reason is that the pressure difference between the pressure surface and the suction surface exists, and the air flow generates strong mutual interference with the surface wall surfaces of the front edge and the rear edge of the blade in the process of flowing from the pressure surface to the suction surface, so that strong pressure pulsation is generated. From the dipole source term in the FW-H equation, it can be seen that a reduction in airfoil surface pressure pulsations reduces the dipole source strength.
The utility model discloses a unsmooth wave type sweepforward leading edge and sawtooth pattern sweepback trailing edge for the vortex of blade leading edge and trailing edge department side surface wall no longer interferes each other, and then has reduced pressure pulsation's production, sweepforward section and sweepback section make the leading edge and the trailing edge extend the noise source phase angle of degree direction stagger each other respectively simultaneously, thereby make local noise can not merge the increase; meanwhile, the flow of the boundary layer is delayed by the sawtooth tail edge, the influence area of the separation area and the wake area is enlarged, the reverse vortex pair is directly crushed after colliding with the original forward vortex pair, and the pneumatic noise of the tail edge is greatly reduced. In addition, the pressure, efficiency and other performances can be synchronously improved. Through verification, the noise of the centrifugal fan blade 100 of the embodiment can be reduced by more than 4db (a) compared with the conventional full-straight design blade.
In conclusion, the bionic design of the concave and convex wave-shaped front edge, the sawtooth tail edge, the front edge forward sweep and the tail edge backward sweep of the centrifugal fan blade 100 not only meets the requirement of ultra-low noise of the forward multi-wing centrifugal fan, but also synchronously meets the requirement of pressure and efficiency improvement of the centrifugal fan, and in addition, the centrifugal fan blade 100 also has better economy.
The present invention further provides a centrifugal fan (not shown), which comprises an impeller and any one of the above centrifugal fan blades 100, wherein the centrifugal fan blades 100 are connected to the impeller.
It should be noted that the terms "first", "second", and the like are used to define the components, and are only used for convenience of distinguishing the corresponding components, and if not stated otherwise, the terms have no special meaning, and therefore, the scope of the present invention should not be construed as being limited.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.
Claims (10)
1. A centrifugal fan blade (100) comprising a blade body (110), the blade body (110) having a blade leading edge (111) and a blade trailing edge (112), characterized in that,
the blade main body (110) is in the shape of an arc plate, the front edge (111) of the blade is arranged in a wave shape, at least one side of the front edge (111) of the blade is provided with a forward swept section (111a), the rear edge (112) of the blade is arranged in a zigzag shape, and at least one side of the rear edge (112) of the blade is provided with a rear swept section (112 b).
2. Centrifugal fan blade (100) according to claim 1, characterized in that the ratio of the length of the forward swept section (111a) of the blade leading edge (111) to the length of the blade leading edge (111) is 1: 3.
3. Centrifugal fan blade (100) according to claim 1 or 2, characterized in that the forward-swept angle of the forward-swept section (111a) with respect to the blade leading edge (111) is 3 ° to 5 °.
4. Centrifugal fan blade (100) according to claim 1, characterized in that the ratio of the length of the swept back section (112b) of the blade trailing edge (112) to the length of the blade trailing edge (112) is 1: 3.
5. Centrifugal fan blade (100) according to claim 1 or 4, characterized in that the swept-back angle of the swept-back section (112b) with respect to the blade trailing edge (112) is 3 ° to 5 °.
6. Centrifugal fan blade (100) according to claim 1, wherein the wave height (h) of the blade leading edge (111)1) And the width (w) of the blade body (110)1) The ratio of the ratio is 0.025 to 0.04; and/or the presence of a catalyst in the reaction mixture,
a wave width (λ) of the blade leading edge (111) and a width (w) of the blade body (110)1) The ratio of the ratio is 0.155 to 0.17.
7. Centrifugal fan blade (100) according to claim 1, characterized in that the tooth height (h) of the blade trailing edge (112) is such that2) And the width (w) of the blade body (110)1) The ratio of the ratio is 0.05 to 0.07; and/or the presence of a catalyst in the reaction mixture,
root width (w) of the blade trailing edge (112)2) And the width (w) of the blade body (110)1) The ratio of the ratio is 0.03 to 0.04.
8. Centrifugal fan blade (100) according to claim 7, characterized in that adjacent serrations of the blade trailing edge (112) have a tooth-space spacing (e) between them, which is related to the width (w) of the blade body (110)1) The ratio of the ratio is 0.085 to 0.105.
9. The centrifugal fan blade (100) of claim 1, wherein the centrifugal fan blade (100) further comprises a lobe (120) attached to one or both sides of the blade body (110), one lobe (120) attached to one side of the blade body (110), or two lobes (120) attached to one side of the blade body (110).
10. A centrifugal fan comprising an impeller and a centrifugal fan blade (100) according to any of claims 1 to 9, the centrifugal fan blade (100) being connected to the impeller.
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| CN201921689988.1U CN210889451U (en) | 2019-10-10 | 2019-10-10 | Centrifugal fan blade and centrifugal fan with same |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114109895A (en) * | 2021-11-25 | 2022-03-01 | 北京航空航天大学 | Circumferential offset high-speed centrifugal impeller for inhibiting boundary layer separation |
| CN114295378A (en) * | 2021-11-17 | 2022-04-08 | 南京航空航天大学 | Hinge type distortion generator with serrated edge |
-
2019
- 2019-10-10 CN CN201921689988.1U patent/CN210889451U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114295378A (en) * | 2021-11-17 | 2022-04-08 | 南京航空航天大学 | Hinge type distortion generator with serrated edge |
| CN114109895A (en) * | 2021-11-25 | 2022-03-01 | 北京航空航天大学 | Circumferential offset high-speed centrifugal impeller for inhibiting boundary layer separation |
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