CN219865638U - Cooling fan noise reduction structure, cooling system and engine - Google Patents
Cooling fan noise reduction structure, cooling system and engine Download PDFInfo
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- CN219865638U CN219865638U CN202320893449.XU CN202320893449U CN219865638U CN 219865638 U CN219865638 U CN 219865638U CN 202320893449 U CN202320893449 U CN 202320893449U CN 219865638 U CN219865638 U CN 219865638U
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- 238000001816 cooling Methods 0.000 title claims abstract description 75
- 238000010276 construction Methods 0.000 claims 2
- 238000010586 diagram Methods 0.000 description 7
- 238000001228 spectrum Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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Abstract
The utility model relates to the technical field of engine cooling fans, in particular to a cooling fan noise reduction structure, a cooling system and an engine. The cooling fan noise reduction structure includes: the fan blade is arranged in the accommodating cavity of the air protection ring; the air outlet end of the wind protection ring is provided with a conical opening, the diameter of the outer end of the conical opening is larger than that of the inner end of the conical opening, the tail part of the blade top of the fan blade is provided with a flange, a set gap is reserved between the flange and the conical opening, and the flange is parallel to the conical opening. The cooling fan of the utility model hardly generates vortex, reduces the back flow of blade tips, ensures that the fan operates more stably, and reduces the noise of the fan. And simultaneously, the reduction of vortex flow improves the cooling efficiency of the cooling fan to a certain extent.
Description
Technical Field
The utility model relates to the technical field of engine cooling fans, in particular to a cooling fan noise reduction structure, a cooling system and an engine.
Background
The cooling system of the engine is an important component of the engine, and the main component of the cooling system is a cooling fan, which has a great influence on the power performance, economy and reliability of the engine.
The cooling fan generally comprises a wind protection ring and fan blades, wherein the wind protection ring is of a straight cylindrical structure, and the fan blades are arranged in the wind protection ring. However, in the existing cooling fan structure, the radial gap between the tail end of the fan blade and the wind protection ring is reserved to be larger, and when the fan blade rotates, vortex is formed at the gap of the blade top, so that a larger backflow phenomenon occurs, and the noise of the cooling fan is large.
Disclosure of Invention
Aiming at the defects in the prior art, the embodiment of the utility model aims to provide a cooling fan noise reduction structure so as to solve the problem of large noise of the cooling fan.
In order to achieve the above object, the embodiment of the present utility model provides the following technical solutions:
a cooling fan noise reduction structure, comprising: the fan blade is arranged in the accommodating cavity of the air protection ring; the air outlet end of the wind protection ring is provided with a conical opening, the diameter of the outer end of the conical opening is larger than that of the inner end of the conical opening, the tail part of the blade top of the fan blade is provided with a flange, a set gap is reserved between the flange and the conical opening, and the flange is parallel to the conical opening.
Preferably, the wind protection ring is provided with a cover body, the cover body is cylindrical, a first end of the cover body is used for being connected to the radiator, and a second end of the cover body is provided with the conical opening.
Preferably, the conical opening is 30-60 degrees away from the extension line of the outer wall of the cover body.
Preferably, the conical opening is 45 degrees from the extension line of the outer wall of the cover body.
Preferably, the cover body and the conical opening are of an integral structure.
Preferably, the gap between the flange and the tapered opening is 10-20mm.
Preferably, the blade body of the fan and the flange are of an integral structure.
Preferably, the fan blade has a plurality of fan blades, and one end of the plurality of fan blades, which is far away from the flange, is mounted on the hub.
The embodiment of the utility model also provides a cooling system which comprises the cooling fan noise reduction structure.
The embodiment of the utility model also provides an engine, which comprises the cooling system.
One or more technical solutions provided in the embodiments of the present utility model at least have the following technical effects or advantages:
when the fan blade of the cooling fan rotates, due to the matching of the conical opening and the flange of the fan blade, after the air flows out from the pressure surface of the fan blade, only little air is reversely sucked and reversed from the gap, so that the secondary circulation of the air is greatly reduced, vortex is hardly generated, the back flow of the blade tip is reduced, the operation of the fan is more stable, and the noise of the fan is reduced. At the same time, the reduction of the vortex flow improves the cooling efficiency of the cooling fan to a certain extent.
Additional aspects of the utility model will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the utility model.
In order to make the above objects, features and advantages of the present utility model more comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description serve to explain the utility model.
FIG. 1 is a schematic diagram of a conventional cooling fan;
FIG. 2 is a schematic diagram of a prior art cooling fan flow field vortex noise;
FIG. 3 is a front view of a cooling fan provided by an embodiment of the present utility model;
FIG. 4 is a first angular perspective view of a cooling fan according to an embodiment of the present utility model;
FIG. 5 is a second angular perspective view of a cooling fan according to an embodiment of the present utility model;
FIG. 6 is a schematic diagram of a fan blade according to an embodiment of the present utility model;
FIG. 7 is a schematic diagram of cooling fan flow field eddy current noise provided by an embodiment of the utility model;
FIG. 8 is a noise spectrum diagram of a conventional cooling fan structure;
FIG. 9 is a noise spectrum of the cooling fan structure of the present utility model;
in the figure: 1. a wind-protecting ring, 11 and a conical opening; 2. fan blades; 21. a flange; 3. a hub; 4. a heat sink;
the mutual spacing or dimensions are exaggerated for the purpose of showing the positions of the various parts, and the schematic illustrations are used for illustration only.
Detailed Description
It should be noted that the following detailed description is illustrative and is intended to provide further explanation of the utility model. 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 utility model belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the present utility model. As used herein, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the utility model clearly indicates otherwise, and it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.
For convenience of description, the words "upper", "lower", "left" and "right" in the present utility model denote only the correspondence with the upper, lower, left, and right directions of the drawing itself, and do not limit the structure, but merely facilitate description of the present utility model and simplify description, without indicating or implying that the apparatus or element to be referred to must have a specific orientation, configuration and operation in a specific orientation, and therefore should not be construed as limiting the present utility model.
Term interpretation section:
an engine cooling system: and part of heat absorbed by the heated part is timely emitted, so that the engine is ensured to work in an optimal temperature state. A common engine cooling system is an air-cooled system.
NVH: english abbreviations of noise, vibration and harshness (Noise, vibration, harshness). This is a comprehensive problem in measuring the quality of automobile manufacture, and it is most direct and superficial to the perception of the automobile user. The NVH problem of vehicles is one of the concerns of various large-vehicle manufacturing enterprises and parts enterprises in the automotive industry. Statistics show that about 1/3 of the fault problems of the whole vehicle are related to the NVH problems of the vehicle, and about 20% of research and development cost of each large company is consumed in solving the NVH problems of the vehicle.
The conventional cooling fan structure is shown in fig. 1, and comprises a straight cylindrical wind-protecting ring, in which fan blades are arranged. The existing cooling fan flow field vortex noise principle is shown in fig. 2, wherein the left side of the cooling fan flow field vortex noise principle is a radiator, the right side of the upper end of the radiator is a wind protection ring, and the lower side of the wind protection ring is provided with fan blades.
In the rotating process of the fan, air is sucked from the suction surface of the fan blade and flows out from the pressure surface of the fan blade, and because the radial clearance between the fan blade and the air protection ring is reserved larger, air flows out from the pressure surface of the fan blade and then reversely sucks in countercurrent from the clearance and is sucked by the suction surface of the fan blade again, secondary circulation is generated, vortex is formed when the air flows out, and the operation of the fan is unstable due to the existence of the vortex, so that NVH noise is larger. Meanwhile, the larger vortex flow can generate larger resistance to the air flow, so that the air output is reduced, and the efficiency of the cooling fan is reduced to a certain extent. With the continuous increase of the power and the rotation speed of the engine, the requirements on the cooling system are higher and higher, and the noise problem of the cooling fan and the cooling efficiency of the fan are higher and higher.
In order to solve the above technical problems, an embodiment of the present utility model provides a cooling fan noise reduction structure, as shown in fig. 3 to 7, including: the fan comprises a fan protection ring 1 and fan blades 2, wherein an accommodating cavity is formed in the fan protection ring 1, the fan blades 2 are arranged in the accommodating cavity of the fan protection ring 1, and when the fan blades 2 rotate, heat is blown out to realize heat dissipation; the air outlet end part of the air protection ring 1 is provided with a conical opening 11, the diameter of the outer end of the conical opening 11 is larger than that of the inner end, as shown in fig. 4, 5 and 7, the outer end refers to the right end of the conical opening 11, namely, the end far away from the radiator 4; the inner end refers to the left end in fig. 7, i.e. the end near the heat sink 4. The top tail of the fan blade is provided with a flange 21, the flange 21 has a set gap with the conical opening 11, and the flange 21 is parallel to the conical opening 11.
As shown in fig. 4, 5 and 7, the air outlet end of the shroud ring 1 of the engine cooling fan is a bell-mouthed tapered opening 11, and the bell-mouths face outward and are provided around the shroud ring 1. As shown in fig. 3 and 6, the tail of the blade top of each fan blade is provided with a flange 21, and the flare is matched with the flange 21 of the blade top of the fan. As shown in FIG. 7, when the fan blade of the cooling fan of the utility model rotates, air is sucked from the suction surface of the fan blade and then flows out from the pressure surface of the fan blade, and because the conical opening 11 is matched with the flange 21 of the fan blade, after the air flows out from the pressure surface of the fan blade, only little air is sucked reversely from the gap and flows back, thus greatly reducing the secondary circulation of the air, almost avoiding vortex, reducing the back flow of the blade tip, ensuring the operation of the fan to be more stable and reducing the noise of the fan. At the same time, the reduction of the vortex flow improves the cooling efficiency of the cooling fan to a certain extent.
As shown in fig. 4 and 5, the wind protection ring 1 has a cover body, the cover body is cylindrical, a first end of the cover body is connected to the radiator 4, that is, a left end of the cover body in fig. 4 is connected to the radiator 4, a second end of the cover body is provided with the conical opening 11, that is, a right end of the cover body in fig. 4 is an air outlet, and the end of the air outlet is provided with the conical opening 11. The fan blades 2 rotate to timely radiate heat of the radiator 4, so that the engine is ensured to work in an optimal temperature state.
The angle between two generatrix of the same axial section (section of the shaft passing through the cone) of the conical opening 11 is 60-120 degrees, which is 30-60 degrees relative to the extension line of the outer wall of the cover body. Further preferably, the conical opening 11 is 45 ° from the extension of the outer wall of the housing body.
As for the gap between the flange 21 and the tapered opening 11, those skilled in the art can reasonably select the gap between the flange 21 and the tapered opening 11 in this embodiment to be 10-20mm according to the size of the cooling fan, the rotation speed of the cooling fan, and other parameters.
The cover body and the tapered opening 11 may be in a split structure and then assembled, and in this embodiment, the cover body and the flange 21 are integrally formed. The blade body of the fan is also integrally formed with the flange 21. The integrated into one piece simple structure does not need too much process and spare part, has reduced the equipment time, has guaranteed the wholeness, moreover can reduce cost.
As shown in fig. 3 and 6, the fan blade has a plurality of fan blades 2, one end far away from the flange 21 of the fan blade is mounted on the hub 3, and the hub 3 rotates to drive the fan to rotate.
Fig. 8 is a noise spectrum diagram of a conventional cooling fan structure, and fig. 9 is a noise spectrum diagram of a cooling fan structure according to the present utility model. As can be seen by comparison, the existing cooling fan has a large radial clearance, a local broadband of 179-300Hz, a large amplitude and obvious fan noise. By adopting the cooling fan, the local broadband amplitude of 179-300Hz is obviously reduced, and by calculating the sound pressure level within 0-2000Hz, the cooling fan is reduced by 2.9dBA compared with the traditional cooling fan, and the noise reduction effect is obvious.
Based on the cooling fan noise reduction structure, the utility model further provides a cooling system and an engine. Since the cooling fan noise reduction structure has the above technical effects, the cooling system and the engine adopting the cooling fan noise reduction structure refer to the above embodiments.
While the foregoing description of the embodiments of the present utility model has been presented in conjunction with the drawings, it should be understood that it is not intended to limit the scope of the utility model, but rather, it is intended to cover all modifications or variations within the scope of the utility model as defined by the claims of the present utility model.
Claims (10)
1. A cooling fan noise reduction structure, characterized by comprising: the fan blade is arranged in the accommodating cavity of the air protection ring;
the air outlet end of the wind protection ring is provided with a conical opening, the diameter of the outer end of the conical opening is larger than that of the inner end of the conical opening, the tail part of the blade top of the fan blade is provided with a flange, a set gap is reserved between the flange and the conical opening, and the flange is parallel to the conical opening.
2. The cooling fan noise reduction structure according to claim 1, wherein the shroud has a shroud body having a cylindrical shape, a shroud body first end for connection to a radiator, and a shroud body second end provided with the tapered opening.
3. The cooling fan noise reduction structure according to claim 2, wherein the tapered opening is 30 ° to 60 ° from an extension line of the outer wall of the cover body.
4. The cooling fan noise reduction structure according to claim 3, wherein the tapered opening is 45 ° from an extension line of the outer wall of the cover body.
5. The cooling fan noise reduction structure according to claim 2, wherein the cover body is of unitary construction with the tapered opening.
6. The cooling fan noise reduction structure of claim 1, wherein a gap between the flange and the tapered opening is 10-20mm.
7. The cooling fan noise reduction structure according to claim 1, wherein the blade body of the fan is of unitary construction with the flange.
8. The cooling fan noise reducing structure according to claim 1, wherein said fan blade has a plurality of pieces, and wherein an end of said plurality of fan blades remote from said flange is mounted on a hub.
9. A cooling system comprising the cooling fan noise reduction structure of any one of claims 1-8.
10. An engine comprising the cooling system of claim 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320893449.XU CN219865638U (en) | 2023-04-17 | 2023-04-17 | Cooling fan noise reduction structure, cooling system and engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320893449.XU CN219865638U (en) | 2023-04-17 | 2023-04-17 | Cooling fan noise reduction structure, cooling system and engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219865638U true CN219865638U (en) | 2023-10-20 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320893449.XU Active CN219865638U (en) | 2023-04-17 | 2023-04-17 | Cooling fan noise reduction structure, cooling system and engine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219865638U (en) |
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2023
- 2023-04-17 CN CN202320893449.XU patent/CN219865638U/en active Active
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