Blade, impeller and range hood
Patent Information
- Application Number
- PCT/CN2024/106010
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- Priority Date
- 2024-03-07
- Filing Date
- 2024-07-17
- Publication Date
- 2025-10-02
AI Technical Summary
When the impeller blades of existing range hoods run at high speed, the airflow angle and geometric angle formed by the airflow and the leading edge of the blades are greatly different, resulting in airflow impact and separation, and generating relatively loud noise.
A blade is designed with an arc-shaped cross-section and a bent wing on the leading edge, including a transition section and a guide section. The guide section extends toward the arc-shaped convex side to optimize the airflow angle; the trailing edge of the blade adopts a serrated structure to reduce shear force and vortex.
It effectively reduces the noise generated by airflow impact, increases the impeller air volume, and improves the working efficiency and noise reduction effect of the range hood.
Smart Images
Figure CN2024106010_02102025_PF_FP_ABST
Abstract
Description
Blades, impellers and range hoods
[0001] CROSS-REFERENCE TO RELATED APPLICATIONS
[0002] This application claims priority to Chinese patent application No. 2024204491139, filed on March 7, 2024, entitled “Blades, Impellers and Range Hoods,” which is incorporated herein by reference in its entirety. Technical Field
[0003] The present application relates to the technical field of range hoods, and in particular to a blade, an impeller and a range hood. Background Art
[0004] In the prior art, impellers in range hoods are typically made of sheet metal, offering oil-free, corrosion-resistant, and high-temperature resistance. However, due to manufacturing limitations, the impeller blades are relatively simple in form. When the impeller is running at high speed, the airflow forms an angle with the horizontal plane when entering the impeller. This angle differs significantly from the geometric angle formed by the leading edge of the blades, resulting in significant airflow impact and separation at the air intake point of the impeller blades, generating significant noise.
[0005] Summary of the Invention
[0006] The present application aims to solve at least one of the technical problems existing in the related art. To this end, the present application proposes a blade that reduces the noise generated by airflow impacting the blade.
[0007] The present application also proposes an impeller.
[0008] The present application also provides a range hood.
[0009] The present application proposes a blade, comprising:
[0010] The blade body has an arc-shaped cross-section, and the blade body has relative leading and trailing edges. The leading edge of the blade body is provided with a bent wing, and the bent wing is provided on the arc-shaped convex side of the blade body; the bent wing has a connected transition connection section and a guide section, the transition connection section is connected to the blade body, and the guide section extends toward the arc-shaped convex side.
[0011] According to the blade proposed in the present application, by arranging the bent wing on the arc-shaped convex side of the leading edge of the blade body, the guide section of the bent wing can guide the airflow entering the surface of the blade body, so that the airflow angle α formed by the airflow at the leading edge of the blade is adapted to the geometric angle β formed by the leading edge of the blade, thereby reducing the pressure pulsation caused by the impact of the inlet airflow, effectively increasing the impeller air volume, and eliminating the flow separation and noise caused by the airflow impacting the blade.
[0012] In some embodiments, the bending radius of the transition connecting section is R1.
[0013] In some embodiments, the chord length of the blade body is L.
[0014] In some embodiments, the value of R1 ranges from 0.01L to 0.015L.
[0015] According to one embodiment of the present application, the radius of the guide section is R2.
[0016] In some embodiments, the value of R2 ranges from 0.15L to 0.25L.
[0017] According to one embodiment of the present application, the chord length of the guide section is S.
[0018] In some embodiments, the value of S ranges from 0.1 to 0.2L.
[0019] According to one embodiment of the present application, the trailing edge of the blade has a serrated structure.
[0020] In some embodiments, the sawtooth structure extends along the height direction of the blade.
[0021] According to one embodiment of the present application, the sawtooth structure is an unequally spaced sawtooth structure.
[0022] According to one embodiment of the present application, the waveform of the sawtooth structure is a sine curve.
[0023] In some embodiments, the frequency of the sinusoid is F.
[0024] In some embodiments, the value of F ranges from 30 to 40.
[0025] In some embodiments, the waveform of the sawtooth structure is a sine curve.
[0026] In some embodiments, the amplitude of the sinusoid is A.
[0027] In some embodiments, the value of A ranges from 0.03 to 0.04L.
[0028] In some embodiments, the sawtooth structure includes a first sawtooth structure and a second sawtooth structure that are spaced apart from each other.
[0029] In some embodiments, the height of the first sawtooth structure is H1.
[0030] In some embodiments, the height of the second sawtooth structure is H2.
[0031] In some embodiments, H1>H2.
[0032] In some embodiments, the value of H1 / (H1+H2) ranges from 0.6 to 0.8.
[0033] The present application also proposes an impeller, comprising:
[0034] The above-mentioned leaves;
[0035] The disc body, the blades are arranged around the circumference of the disc body.
[0036] In some embodiments, the radius of the disk is D1, the radius of the impeller is D2, and the value range of D1 / D2 is 0.75-0.85.
[0037] The impeller proposed in the present application includes the above-mentioned blades and thus also has the beneficial effects of the above-mentioned blades, which will not be described in detail here.
[0038] The present application also proposes a range hood, comprising:
[0039] the impeller mentioned above;
[0040] a volute, wherein the impeller is disposed in the volute;
[0041] The shell is provided with an air duct and a smoking port, the air duct is communicated with the volute, and the smoking port is communicated with the air duct.
[0042] The range hood proposed in the present application includes the above-mentioned impeller and thus also has the beneficial effects of the above-mentioned impeller, which will not be described in detail here.
[0043] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become obvious from the description below, or will be learned through practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS
[0044] In order to more clearly illustrate the technical solutions in the embodiments of the present application or related technologies, the following briefly introduces the drawings required for use in the embodiments or related technical descriptions. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.
[0045] FIG1 is a schematic diagram of the impeller structure provided by the present application;
[0046] FIG2 is a cross-sectional view of the impeller structure provided by the present application;
[0047] FIG3 is a partial enlarged view of point A in FIG2 ;
[0048] FIG4 is a partial enlarged view of point B in FIG3 ;
[0049] FIG5 is a schematic diagram of the blade structure provided in this application;
[0050] FIG6 is a partial enlarged view of point C in FIG5 .
[0051] Reference numerals:
[0052] 10. Impeller;
[0053] 110. Blade; 111. Blade body; 112. Bent wing; 1121. Transition section; 1122. Guide section; 113. Convex side; 114. Sawtooth structure; 1141. First serration structure; 1142. Second serration structure; 115. Leading edge; 1151. Slot; 116. Trailing edge;
[0054] 120. Plate body. DETAILED DESCRIPTION
[0055] The following embodiments of the present invention are described in further detail with reference to the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.
[0056] In the description of the embodiments of the present application, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the embodiments of the present application. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.
[0057] In the description of the embodiments of this application, it should be noted that, unless otherwise specified or limited, the terms "connected" and "connection" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium. Those skilled in the art will understand the specific meanings of the above terms in the embodiments of this application based on the specific circumstances.
[0058] In the embodiments of the present application, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, a first feature being "above," "above," and "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.
[0059] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiments of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples, unless they are contradictory.
[0060] The applicant discovered that impellers in range hoods are typically made of sheet metal, offering oil-free, corrosion-resistant, and high-temperature resistance. However, due to manufacturing limitations, the impeller blades are relatively simple in design. When the impeller is running at high speed, the airflow forms an angle with the horizontal plane when entering the impeller. This angle differs significantly from the geometric angle formed by the leading edge of the blades, resulting in significant airflow impact and separation at the air intake point of the impeller blades, generating significant noise.
[0061] Therefore, in related technologies, a guide plate is installed on the inner concave surface of the blade tail end to prevent gas loss at the outlet and reduce energy consumption. However, since the airflow is faster at the impeller outlet after passing through the impeller, the guide plate will cause airflow obstruction.
[0062] As shown in Figures 2 to 4, the present application provides a blade 110, comprising a blade body 111 and a bent wing 112. In some embodiments, the blade 110 provided by the present application is disposed in an impeller 10, which is disposed in a range hood to provide power for the range hood to extract oil fumes.
[0063] As shown in Figures 3 and 4, the cross-section of the blade body 111 is arcuate, and the blade body 111 has a leading edge 115 and a trailing edge 116 opposite each other. When the blade body 111 is in operation, the leading edge 115 of the blade 110 enters, flows along the surface of the blade body 111, and then flows out from the trailing edge 116 of the blade 110. The leading edge 115 of the blade body 111 is provided with a bent wing 112, and the bent wing 112 is provided on the arcuate convex side 113 of the blade body 111. The bent wing 112 has a transition section 1121 and a guide section 1122 connected to each other. The transition section 1121 is connected to the blade body 111, and the guide section 1122 extends toward the arcuate convex side 113.
[0064] As shown in Figure 4, when the airflow enters the surface of the blade body 111, the airflow angle formed at the leading edge 115 of the blade 110 is α, and the geometric angle formed at the leading edge 115 of the blade 110 is β. When the airflow enters the surface of the blade body 111, the airflow can flow along the guide section 1122, so that the airflow angle α and the geometric angle β formed by the leading edge 115 of the blade 110 can be adapted to prevent a large numerical difference between the airflow angle and the geometric angle, thereby reducing the pressure pulsation caused by the impact of the inlet airflow, effectively increasing the air volume of the impeller 10, and eliminating the flow separation and noise caused by the airflow impacting the blade 110.
[0065] According to the blade 110 of the embodiment of the present application, by arranging the bent wing 112 on the curved convex side 113 of the leading edge 115 of the blade body 111, the guide section 1122 of the bent wing 112 can guide the airflow entering the surface of the blade body 111, so that the airflow angle α formed by the airflow at the leading edge 115 of the blade 110 is adapted to the geometric angle β formed by the leading edge 115 of the blade 110, thereby reducing the pressure pulsation caused by the impact of the inlet airflow, effectively increasing the air volume of the impeller 10, and eliminating the flow separation and noise caused by the airflow impacting the blade 110.
[0066] As shown in Figures 3 and 4, in one embodiment of the present application, the bending radius of the transition section 1121 is R1, the chord length of the blade body 111 is L, and the value range of R1 is 0.01L-0.015L. In this way, the bending angle of the transition section 1121 can be determined, and thus the inclination angle of the guide section 1122 relative to the blade body 111 can be determined, to ensure that the guide section 1122 can effectively guide the airflow, reduce the impact and separation of the airflow at the leading edge 115 of the blade 110, and thus reduce noise.
[0067] As shown in Figure 4, in one embodiment of the present application, the radius of the guide section 1122 is R2, and the value range of R2 is 0.15L-0.25L. For example, the radius R2 of the guide section 1122 can be 0.2L. By adjusting the curvature of the guide section 1122, the flow path of the airflow through the guide section 1122 is changed, further ensuring that the guide section 1122 can effectively guide the airflow. This helps reduce the air volume and noise generated during the operation of the range hood, improving the overall performance of the device.
[0068] As shown in FIG4 , in one embodiment of the present application, the chord length of the guide section 1122 is S, and the value of S ranges from 0.1L to 0.2L. This ensures that the guide section 1122 is of sufficient length to guide the airflow, so that the airflow angle α formed by the airflow at the leading edge 115 of the blade 110 is compatible with the geometric angle β formed by the leading edge 115 of the blade 110, thereby reducing the pressure pulsation caused by the impact of the inlet airflow, effectively increasing the air volume of the impeller 10, and eliminating the flow separation and noise caused by the airflow impacting the blade 110. At the same time, this length range also ensures that the guide section 1122 is not too long, avoiding the problem of airflow blockage caused by an overly long guide section 1122, further improving the operating efficiency of the range hood and reducing noise.
[0069] As shown in Figures 5 and 6, in one embodiment of the present application, the trailing edge 116 of the blade 110 is a sawtooth structure 114, and the sawtooth structure 114 extends along the height direction of the blade 110. Since the multi-blade centrifugal impeller 10 has axial air intake, in a shorter blade path, the airflow is forced to quickly turn at a large angle to achieve radial air discharge, resulting in a low-speed separation zone with high speed at the trailing edge 116 of the blade 110 and low speed at the leading edge 115 of the blade 110. Because the speed of the gas flow at the trailing edge 116 of the blade 110 is significantly higher than the speed of the gas flow at the leading edge 115 of the blade 110, a velocity gradient is generated when the gas exits the trailing edge 116 of the blade 110, thereby causing a shear effect on the airflow. This shear force causes the fluid to form a vortex at the trailing edge 116 of the blade 110, which is also known as a shedding vortex. The shedding vortex not only reduces the aerodynamic performance of the blade 110, but also generates noise.
[0070] When the trailing edge 116 of the blade 110 is configured as a sawtooth shape, the fluid's flow path changes as the fluid passes through the trailing edge 116 due to the change in shape of the trailing edge 116, thereby disrupting the fluid's continuity, reducing the velocity gradient, and thereby reducing the generation of shear forces. Furthermore, the sawtooth shape of the trailing edge 116 of the blade 110 can also break up shedding vortices, further reducing noise.
[0071] Therefore, the trailing edge 116 of the blade 110 is configured in a sawtooth shape, which can reduce the shear force of the airflow itself, improve the aerodynamic performance of the blade 110, and reduce noise.
[0072] As shown in Figure 5, in one embodiment of the present application, the serration structure 114 is an unequally spaced serration structure 114. The unequally spaced serration structure 114 can provide a more complex fluid interference pattern. Compared with equidistant serrations, it can more effectively disrupt and disperse the vortex structure in the fluid. This dispersion effect helps to reduce the separation of the fluid on the surface of the blade 110 and reduce the formation of shedding vortices, thereby improving the aerodynamic performance and efficiency of the blade 110. In addition, the unequally spaced serration structure 114 may also have a positive effect on the structural strength and durability of the blade 110. By optimizing the layout and size of the serrations, stress concentration points can be reduced, thereby improving the structural stability and service life of the blade 110.
[0073] As shown in FIG5 and FIG6 , in one embodiment of the present application, the waveform of the sawtooth structure 114 is a sine curve, wherein the shape of the sine curve conforms to the image of the following function:
[0074] xt=Hn*t^2, t∈0-1, n=1,2;
[0075] yt=A*sin(2π*F*t),t∈0-1,
[0076] Wherein, F is the frequency of the sine curve, and the value range of F is 30-40. A is the amplitude of the sine curve, and the value range of A is 0.03-0.04L.
[0077] As shown in Figures 1 and 5, in some embodiments of the present application, the leading edge 115 of the blade 110 is provided with a slot 1151, and the disc 120 is locked in the slot 1151. The bottom groove wall of the slot 1151 separates the serration structure 114 to form a first serration structure 1141 and a second serration structure 1142. The height of the first serration structure 1141 is H1, and the height of the second serration structure 1142 is H2. H1>H2, and the value range of H1 / (H1+H2) is 0.6-0.8. Setting the height difference between H1 and H2 can further change the fluid dynamic characteristics of the trailing edge 116 of the blade 110, thereby optimizing the aerodynamic performance of the impeller 10.
[0078] According to the above function, when n=1, the function graph is in the shape of the first sawtooth structure 1141 ; when n=2, the function graph is in the shape of the second sawtooth structure 1142 .
[0079] As shown in Figures 1 and 2, the present application also proposes an impeller 10 comprising the aforementioned blades 110 and a disc 120, with the blades 110 disposed around the circumference of the disc 120. The blades 110 can rotate about the disc 120, thereby dynamically adjusting the direction and speed of the airflow. Of course, the arrangement of the blades 110 is not limited to this. In other examples, the blades 110 are fixed around the disc 120, but can oscillate. This allows the blades 110 to adaptively adjust their angles based on changes in the airflow, similarly achieving effective airflow guidance and acceleration. This impeller 10 is designed to improve airflow guidance efficiency and acceleration performance and is suitable for use in range hoods to optimize their intake and exhaust performance. The impeller 10 proposed in the present application, because it includes the aforementioned blades 110, also exhibits the beneficial effects of the blades 110.
[0080] As shown in FIG2 , in some embodiments of the present application, the radius of the disk 120 is D1 , the radius of the impeller 10 is D2 , and the value range of D1 / D2 is 0.75-0.85. For example, the value of D1 / D2 may be 0.8.
[0081] Table 1 shows the test results of an existing impeller and the impeller 10 provided by this application in the same range hood. As can be seen, at the same speed, the existing impeller produces an air volume of 17.2 cm3 and a noise power of 67.6 dB. The impeller 10 designed using this application achieves an air volume of 18.1 cm3 and a noise power of 66.2 dB. Compared to the existing impeller 10, the impeller 10 designed using this application achieves a 5% increase in air volume and a 1.4 dB reduction in noise.
[0082] Table 1 Overall performance test results
[0083] The present application also provides a range hood (not shown in the figure), comprising the above-mentioned impeller 10, a volute (not shown in the figure), and a housing (not shown in the figure). The impeller 10 is disposed in the volute, and the housing is provided with an air duct and a smoke outlet, the air duct being connected to the volute, and the smoke outlet being connected to the air duct.
[0084] The range hood proposed in the present application includes the above-mentioned impeller 10 and thus also has the beneficial effects of the above-mentioned impeller 10, which will not be described in detail here.
[0085] Finally, it should be noted that the above embodiments are intended only to illustrate the present application and are not intended to limit the present application. Although the present application has been described in detail with reference to the embodiments, those skilled in the art should understand that various combinations, modifications, or equivalent substitutions of the technical solutions of the present application do not depart from the scope of the technical solutions of the present application and should be encompassed by the claims of the present application.
Claims
1. A blade comprising: The blade body has an arc-shaped cross-section, and the blade body has relative leading and trailing edges. The leading edge of the blade body is provided with a bent wing, and the bent wing is provided on the arc-shaped convex side of the blade body; the bent wing has a connected transition connection section and a guide section, the transition connection section is connected to the blade body, and the guide section extends toward the arc-shaped convex side.
2. The blade according to claim 1, wherein The bending radius of the transition connection section is R1, the chord length of the blade body is L, and the value range of R1 is 0.01L-0.015L.
3. The blade according to claim 1 or 2, wherein: The radius of the guide section is R2, and the value range of R2 is 0.15L-0.25L.
4. The blade according to any one of claims 1 to 3, wherein: The chord length of the diversion section is S, and the value range of S is 0.1-0.2L.
5. The blade according to any one of claims 1 to 4, wherein: The trailing edge of the blade is in a sawtooth structure, and the sawtooth structure extends along the height direction of the blade.
6. The blade according to claim 5, wherein: The sawtooth structure is an unequally spaced sawtooth structure.
7. The blade according to claim 6, wherein: The waveform of the sawtooth structure is a sine curve, the frequency of the sine curve is F, and the value range of F is 30-40.
8. The blade according to any one of claims 5 to 7, wherein: The waveform of the sawtooth structure is a sine curve, the amplitude of the sine curve is A, and the value range of A is 0.03-0.04L.
9. The blade according to any one of claims 5 to 8, wherein: The sawtooth structure includes a first sawtooth structure and a second sawtooth structure spaced apart from each other. The height of the first sawtooth structure is H1, the height of the second sawtooth structure is H2, H1>H2, and the value range of H1 / (H1+H2) is 0.6-0.
8.
10. An impeller comprising: The blade according to any one of claims 1 to 9; The disc body, the blades are arranged around the circumference of the disc body.
11. The impeller according to claim 10, wherein: The radius of the disk is D1, the radius of the impeller is D2, and the value range of D1 / D2 is 0.75-0.
85.
12. A range hood comprising: The impeller according to any one of claims 10-11; a volute, wherein the impeller is disposed in the volute; The shell is provided with an air duct and a smoking port, the air duct is communicated with the volute, and the smoking port is communicated with the air duct.