Impellers, centrifugal fans and range hoods

Abstract

The present invention relates to the field of fan equipment, and more specifically, to an impeller, a centrifugal fan, and a range hood. The impeller includes blades each having a flow-disrupting structure fixed thereto, the flow-disrupting structure protruding from the convex side of the blade. A centrifugal fan includes the aforementioned impeller. A range hood includes the aforementioned centrifugal fan. The impeller, centrifugal fan, and range hood provided by the present invention have an airflow boundary layer near the blades that is not easily separated from the blades, resulting in low vortex noise, excellent aerodynamic performance, and enhanced fume extraction.

Description

Technical Field

[0001] The present invention relates to the field of fan equipment, and in particular to an impeller, a centrifugal fan and a range hood. Background Art

[0002] Range hoods generally use strongly forward-curved multi-blade centrifugal fans to suck in oil smoke from the middle air inlet of the centrifugal fan and discharge it to the peripheral side of the impeller through the channels between the blades of the centrifugal fan's impeller. During the flow of air in the channels between the blades of the impeller, an air flow boundary layer will be formed in the area close to the blade surface. In this air flow boundary layer, the fluid has a large viscous force.

[0003] However, the impeller of a strongly forward-curved multi-blade centrifugal fan has a very short flow path and the blades are greatly curved, which causes the boundary layer of the airflow near the blades to easily separate from the blades during the flow, displacing the mainstream airflow, causing airflow backflow, and then forming a strong vortex, which not only easily reduces the aerodynamic performance of the fan and affects the oil fume extraction effect of the range hood, but also easily generates a lot of noise.

[0004] In summary, how to overcome the above-mentioned defects of the impeller of the existing strongly forward curved multi-blade centrifugal fan is a technical problem that needs to be solved urgently by those skilled in the art. Summary of the Invention

[0005] The object of the present invention is to provide an impeller, a centrifugal fan and a range hood to alleviate the technical problem in the prior art of the impeller of the strongly forward-curved multi-blade centrifugal fan that the airflow boundary layer close to the blades is easily separated from the blades during the flow process.

[0006] The impeller provided by the present invention comprises a blade, on which a flow-disturbing structure is fixed, and the flow-disturbing structure protrudes from the convex side of the blade.

[0007] Preferably, as an implementable embodiment, the flow-disturbing structure is located between the impeller front disk and the impeller middle disk of the impeller.

[0008] Preferably, as an implementable embodiment, the ratio of the distance between the spoiler structure and the impeller center disk of the impeller to the width of the impeller is in the range of 0.1 to 0.5; and / or, the line connecting the outer end and the inner end of the spoiler structure is inclined from the inside to the outside toward the impeller center disk, and the inclination angle of the line connecting the outer end and the inner end of the spoiler structure is in the range of 0° to 60°.

[0009] Preferably, as an implementable embodiment, the spoiler structure includes a guide vane, and the guide vane is inclined along a straight line from the inside to the outside toward the impeller center disk.

[0010] Preferably, as an implementation method, the edge of the impeller disk has a guide cone surface, and the inclination angle of the guide plate is the same as the inclination angle of the generatrix of the guide cone surface; and / or, the ratio of the thickness of the guide plate to the thickness of the blade is in the range of 1 to 2.

[0011] Preferably, as an implementable embodiment, the guide vane is fixed on each of the blades.

[0012] Preferably, as an implementable embodiment, a plurality of the guide vanes are sequentially connected along the circumference of the impeller to form a guide ring.

[0013] Preferably, as an implementable embodiment, the guide ring is provided with first slots corresponding one-to-one to the blades, and each blade is provided with a second slot corresponding to the guide ring.

[0014] Each of the blades can be snapped into the corresponding first slot, and the guide ring can be snapped into each of the second slots.

[0015] Preferably, as an implementable embodiment, the notch of the first card slot is arranged to face outward, and the notch of the second card slot is arranged to face inward.

[0016] Preferably, as an implementation method, the guide ring is a circular ring, and the guide ring is coaxial with the impeller, the inner diameter of the guide ring is equal to the inner diameter of the impeller, and the outer diameter of the guide ring is equal to the outer diameter of the impeller center disk.

[0017] Correspondingly, the present invention also provides a centrifugal fan, which includes the above-mentioned impeller.

[0018] The present invention also provides a range hood comprising the centrifugal fan.

[0019] The impeller, centrifugal fan and range hood provided by the present invention have the following beneficial effects:

[0020] The impeller provided by the present invention has a spoiler structure protruding from the convex side of the blade fixed on the blade of the impeller. When the airflow boundary layer close to the blade passes through the spoiler structure, the spoiler structure protruding from the blade will disturb the airflow, prompting the airflow boundary layer to mix with the mainstream airflow, so that the fluid momentum in the airflow boundary layer is increased, so as to improve the resistance of the fluid momentum of the airflow boundary layer to the fluid viscosity force. In this way, the airflow boundary layer close to the blade is not easy to separate from the blade, and accordingly, the airflow boundary layer is not easy to squeeze out the mainstream airflow, which alleviates the problem of airflow backflow and reduces the vortex intensity. Therefore, the noise generated by the vortex can be reduced and the aerodynamic performance of the centrifugal fan can be improved.

[0021] The centrifugal fan provided by the present invention includes the above-mentioned impeller.

[0022] Therefore, the centrifugal fan provided by the present invention has better aerodynamic performance and generates less noise.

[0023] The range hood provided by the present invention includes the above-mentioned fan.

[0024] Therefore, the range hood provided by the present invention has better aerodynamic performance, better oil fume extraction effect, and generates less noise. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0026] Figure 1 A three-dimensional diagram of an impeller provided in an embodiment of the present invention;

[0027] Figure 2 A cross-sectional view of an impeller provided in an embodiment of the present invention;

[0028] Figure 3 A three-dimensional diagram of the assembly structure of a guide ring and a blade in an impeller provided in an embodiment of the present invention;

[0029] Figure 4 for Figure 3 Enlarged view of part A;

[0030] Figure 5 A front view of the assembly structure of a guide ring and a blade in an impeller provided by an embodiment of the present invention;

[0031] Figure 6 A three-dimensional diagram of blades in an impeller provided in an embodiment of the present invention;

[0032] Figure 7 for Figure 6 Magnified view of part B.

[0033] icon:

[0034] 100 - impeller;

[0035] 110 - blade; 111 - second slot;

[0036] 120 - guide ring; 121 - guide vane; 122 - first slot;

[0037] 130-impeller center disc; 131-guide cone;

[0038] 140-Impeller front disc. DETAILED DESCRIPTION

[0039] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0040] In the description of the present invention, it should be noted that the terms "inner" and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0041] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted" and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0042] The present invention will be further described in detail below through specific embodiments in conjunction with the accompanying drawings.

[0043] See also Figure 1 and Figure 2 This embodiment provides an impeller 100 , which includes a blade 110 . A flow-disturbing structure is fixed on the blade 110 , and the flow-disturbing structure protrudes from the convex side of the blade 110 .

[0044] When the airflow boundary layer near the blade 110 passes through the spoiler structure, the spoiler structure protruding from the blade 110 will disturb the airflow, causing the airflow boundary layer to mix with the mainstream airflow, thereby increasing the fluid momentum in the airflow boundary layer, so as to improve the resistance of the fluid momentum of the airflow boundary layer to the fluid viscosity. In this way, the airflow boundary layer near the blade 110 will not easily separate from the blade 110, and accordingly, the airflow boundary layer will not easily squeeze out the mainstream airflow, alleviating the airflow backflow problem and reducing the vortex intensity. Therefore, the noise generated by the vortex can be reduced and the aerodynamic performance of the centrifugal fan can be improved.

[0045] Preferably, see Figure 1 and Figure 2The above-mentioned spoiler structure is installed between the impeller front disk 140 and the impeller middle disk 130 of the impeller 100.

[0046] It should be noted that the vortex caused by the airflow boundary layer generally appears between the impeller front disk 140 and the impeller middle disk 130. Therefore, installing the spoiler structure between the impeller front disk 140 and the impeller middle disk 130 of the impeller 100 can more fully exert the spoiler effect of the spoiler structure. In this way, the airflow channel area occupied by the spoiler structure can be reduced, thereby reducing the vortex intensity while reducing the impact of the spoiler structure on the ventilation area of ​​the impeller 100, thereby improving the aerodynamic performance of the centrifugal fan.

[0047] Furthermore, the ratio of the distance between the spoiler structure and the impeller center disk 130 to the width of the impeller 100 can be set to a range of 0.1 to 0.5.

[0048] It should be noted that the vortex caused by the airflow boundary layer generally gathers in the area between the impeller middle disk 130 and the impeller front disk 140, close to the impeller middle disk 130. Therefore, setting the distance between the spoiler structure and the impeller middle disk 130 to 0.1 to 0.5 times the width of the impeller 100 can better exert the spoiler effect of the spoiler structure.

[0049] The line connecting the outer end and the inner end of the spoiler structure can be tilted from the inside to the outside toward the impeller center disk 130, and the inclination angle range of the line connecting the outer end and the inner end of the spoiler structure can be set to 0°-60°, which can alleviate the problem of the spoiler structure blocking the airflow and improve the aerodynamic performance of the centrifugal fan.

[0050] In particular, the distance between the outer end of the flow-turbulating structure and the impeller center disk 130 of the impeller 100 may be set to 12 mm.

[0051] See also Figure 2 - Figure 5 A guide vane 121 (the guide vane 121 in this embodiment is the guide structure) may be provided in the guide structure, and the guide vane 121 is tilted along a straight line from the inside to the outside toward the impeller center disk 130 .

[0052] It should be noted that the airflow between the impeller front disk 140 and the impeller middle disk 130 is blown out from the inside to the outside toward the impeller middle disk 130. Therefore, tilting the guide vane 121 from the inside to the outside toward the impeller middle disk 130 along a straight line can reduce the blocking area of ​​the guide vane 121 on the airflow, reduce the impact of the guide vane 121 on the ventilation area of ​​the impeller 100, and improve the aerodynamic performance of the centrifugal fan.

[0053] See also Figure 2The edge of the impeller center disk 130 has a guide cone 131, and the inclination angle of the guide vane 121 is set to be the same as the inclination angle of the generatrix of the guide cone 131 of the impeller center disk 130 (for example, the inclination angle of the guide vane 121 is set to 35°). In this state, the flow direction of the guide vane 121 is closest to or the same as that of the airflow, and the blocking area of ​​the airflow generated by the guide vane 121 is minimized, which can minimize the impact of the guide vane 121 on the ventilation area of ​​the impeller 100.

[0054] In particular, the ratio of the thickness of the guide vane 121 to the thickness of the blade 110 can be set to a range of 1 to 2. In this way, while ensuring the strength of the guide vane 121 itself, the blocking area of ​​the guide vane 121 on the airflow can be reduced, and the impact of the guide vane 121 on the ventilation area of ​​the impeller 100 can be reduced.

[0055] See also Figure 1 and Figure 2 A guide vane 121 can be fixed on each blade 110 so that the boundary layer fluid on the convex side of each blade 110 can be disturbed by the guide vane 121, so that the boundary layer fluid corresponding to each blade 110 is not easy to separate from the blade 110, so that the vortex intensity at each blade 110 can be reduced, the vortex has less impact on the performance of the centrifugal fan, and the noise reduction effect is better.

[0056] Based on the above structure, see Figure 3 , multiple guide vanes 121 can be connected in sequence along the circumference of the impeller 100 to form an annular guide ring 120. In this way, multiple guide vanes 121 are connected into an integral structure, thereby reducing the difficulty of assembling the guide vanes 121 and the blades 110.

[0057] It should be noted that the guide ring 120 can be one or more, that is, multiple guide vanes 121 can be divided into one or more groups, that is, several guide vanes 121 are fixed on each blade 110, and the guide vanes 121 in the same group are interconnected to form a guide ring 120, and multiple groups of guide vanes 121 can form multiple guide rings 120.

[0058] Preferably, only one guide ring 120 is provided to reduce the influence of the guide ring 120 on the ventilation area of ​​the impeller 100 .

[0059] Specifically, see Figure 3 - Figure 7 , a first slot 122 corresponding to each of the blades 110 may be provided on the guide ring 120 , and a second slot 111 corresponding to the guide ring 120 may be provided on each blade 110 .

[0060] When the guide ring 120 and the blade 110 are assembled, the notch of the second slot 111 on the blade 110 can be aligned with the notch of the first slot 122 on the guide ring 120, and then the blade 110 is inserted into the first slot 122. When the blade 110 is inserted to the bottom of the first slot 122, the guide ring 120 can be inserted into the second slot 111 until the bottom of the first slot 122 contacts the bottom of the second slot 111. In this way, the blade 110 is positioned by the first slot 122 on the guide ring 120, and the guide ring 120 is also positioned by the second slot 111 on the blade 110, thereby realizing the assembly of the blade 110 and the guide ring 120. The assembly process is simple and the structure is firm after the assembly is completed.

[0061] See also Figure 3 In the specific structure of the guide ring 120, any two adjacent guide plates 121 are separated by the first card slot 122, that is, the area between each two adjacent first card slots 122 is used to be clamped in the air flow channel between the two adjacent blades 110. It should be noted that Figure 3 Only one of the guide plates 121 and one of the first slots 122 are marked for illustration.

[0062] Specifically, the notch of the first card slot 122 can be arranged to face outward, and correspondingly, the notch of the second card slot 111 can be arranged to face inward, which is more convenient for installation.

[0063] Optionally, the length of the second slot 111 on the blade 110 is set to 7 mm.

[0064] In particular, the guide ring 120 can be set as a circular ring, and the guide ring 120 and the impeller 100 are coaxial. On this basis, the inner diameter of the guide ring 120 is set to be equal to the inner diameter of the impeller 100. At the same time, the outer diameter of the guide ring 120 is set to be equal to the outer diameter of the impeller center plate 130. In this way, not only can the guide effect of the guide ring 120 on the airflow be improved, but also the guide ring 120 does not have a part protruding from the blades 110, which can reduce the impact of the guide ring 120 on the original structure of the impeller 100.

[0065] This embodiment also provides a centrifugal fan, which includes the impeller 100 described above.

[0066] Therefore, the centrifugal fan provided in this embodiment has better aerodynamic performance and generates less noise.

[0067] This embodiment also provides a range hood, which includes the above-mentioned fan.

[0068] Therefore, the range hood provided in this embodiment has better aerodynamic performance, better oil fume extraction effect, and generates less noise.

[0069] In summary, the present invention discloses an impeller 100, a centrifugal fan, and a range hood that overcome many technical drawbacks of conventional impellers 100 for strongly forward-curved multi-blade centrifugal fans. The impeller 100, centrifugal fan, and range hood provided in this embodiment prevent the boundary layer of airflow near the blades 110 from easily separating from the blades 110, resulting in low vortex noise, excellent aerodynamic performance, and enhanced fume extraction.

[0070] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A centrifugal fan, the centrifugal fan being a strongly forward-curved multi-blade centrifugal fan, the centrifugal fan comprising an impeller (100), characterized in that: The impeller (100) comprises a blade (110), a flow-disturbing structure being fixed to the blade (110), the flow-disturbing structure protruding from a convex side of the blade (110); When the boundary layer of the airflow near the blade (110) passes through the spoiler structure, the spoiler structure protruding from the blade (110) will cause disturbance to the airflow; The flow-disturbing structure is located between the impeller front disk (140) and the impeller middle disk (130) of the impeller (100); The line connecting the outer end and the inner end of the flow-disturbing structure is inclined from the inside to the outside toward the impeller center disk (130), and the inclination angle of the line connecting the outer end and the inner end of the flow-disturbing structure ranges from 0° to 60°.

2. The centrifugal fan according to claim 1, characterized in that: The ratio of the distance between the flow-turbulating structure and the impeller center disk (130) of the impeller (100) to the width of the impeller (100) is in the range of 0.1 to 0.

5.

3. The centrifugal fan according to claim 1, characterized in that: The flow-disturbing structure comprises a guide vane (121), and the guide vane (121) is inclined along a straight line from the inside to the outside toward the impeller center disk (130).

4. The centrifugal fan according to claim 3, characterized in that: The edge of the impeller center disk (130) has a guide cone surface (131), and the inclination angle of the guide plate (121) is the same as the inclination angle of the generatrix of the guide cone surface (131); And / or, the ratio of the thickness of the guide plate (121) to the thickness of the blade (110) is in the range of 1 to 2.

5. The centrifugal fan according to claim 3 or 4, characterized in that: The guide plate (121) is fixed on each of the blades (110).

6. The centrifugal fan according to claim 5, characterized in that: The plurality of guide blades (121) are sequentially connected along the circumference of the impeller (100) to form a guide ring (120).

7. The centrifugal fan according to claim 6, characterized in that: The guide ring (120) is provided with first slots (122) corresponding one-to-one to the blades (110), and each blade (110) is provided with a second slot (111) corresponding to the guide ring (120); Each blade (110) can be snapped into the corresponding first snap-in groove (122), and the guide ring (120) can be snapped into each second snap-in groove (111).

8. The centrifugal fan according to claim 7, characterized in that: The notch of the first card slot (122) is arranged outward, and the notch of the second card slot (111) is arranged inward.

9. The centrifugal fan according to claim 6, characterized in that: The guide ring (120) is a circular ring, and the guide ring (120) is coaxial with the impeller (100), the inner diameter of the guide ring (120) is equal to the inner diameter of the impeller (100), and the outer diameter of the guide ring (120) is equal to the outer diameter of the impeller center disk (130).

10. A range hood, characterized in that: A centrifugal fan comprising the centrifugal fan according to any one of claims 1 to 9.

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