Blade for fan rotor, fan and range hood

Abstract

A blade tip winglet is arranged on the radial outer edge of the blade, the blade tip winglet extends towards the suction side of the blade, and the blade tip winglet comprises a pressure side edge, a suction side edge and a radial outer side face located between the pressure side edge and the suction side edge. A plurality of grooves are formed in the radial outer side surface of the blade tip winglet at intervals; therefore, a plurality of airflow runners are provided between the pressure side edge and the suction side edge of the blade tip winglet through the plurality of grooves, when the blade tip winglet is adopted to weaken leakage flow at the blade top, a plurality of strands of airflow penetrating through the plurality of grooves respectively exist at the blade top of the blade, and a plurality of small-scale airflow vortexes are generated after the plurality of strands of airflow penetrate through the grooves; large-scale blade tip airflow vortexes can be damaged, airflow energy loss and airflow vortex noise caused by the large-scale blade tip airflow vortexes are reduced, and the fan efficiency is improved.

Description

Technical Field

[0001] This invention relates to the field of home appliance technology, and in particular to a blade for a fan rotor, a fan, and a range hood. Background Technology

[0002] Air volume, pressure rise, efficiency, and noise are important performance indicators for range hood fans. Currently, most range hoods use centrifugal fans, while axial or mixed-flow fans are rarely used. To achieve the same air volume and pressure rise, axial and mixed-flow fans are noisier than centrifugal fans. For axial fans to achieve the same performance as centrifugal fans in existing range hoods, the noise level is too high.

[0003] In axial flow fans, in order to ensure the relative motion between the rotor and the casing, there is a certain tip clearance between the top of the moving blades and the casing. When the moving blades rotate, the static pressure on the pressure side of the blade tip is greater than that on the suction side. Under the action of pressure difference, the fluid leaks from the pressure side to the suction side through the tip clearance, generating tip leakage flow and forming vortices, i.e., tip separation flow or tip leakage vortex, which increases the flow resistance, causes airflow loss, generates vortex noise, and affects the efficiency of the fan. Summary of the Invention

[0004] In view of the above-mentioned problems in the prior art, the present invention provides a blade for a fan rotor, a fan and a range hood. By optimizing the blade structure of the fan rotor, leakage flow generated by the blade tip clearance is reduced, thereby reducing fan noise.

[0005] In a first aspect, the present invention provides a blade for a wind turbine rotor, the blade comprising a suction side and a pressure side, wherein a blade tip winglet is provided on the radial outer edge of the blade, the blade tip winglet being connected to the radial outer edge of the blade and extending toward the suction side; The blade tip winglet includes a pressure side edge, a suction side edge, and a radially outer surface located between the pressure side edge and the suction side edge. Multiple grooves are spaced apart on the radially outer surface of the blade tip winglet, and the two ends of the grooves extend to the pressure side edge and the suction side edge, respectively.

[0006] Optionally, the average thickness T1 of the blade and the thickness T2 of the blade tip winglet satisfy: 1≤T2 / T1≤4.

[0007] Optionally, the average thickness T1 is 0.5-4 mm, and the thickness T2 is 1.2-5 mm.

[0008] Optionally, the blade tip winglet includes a main wing segment and two end wing segments located at both ends of the main wing segment. The main wing segment has a height h, which is the distance between the suction-side edge and the pressure-side edge of the main wing segment at any position in its extension direction. The height of the end wing segment gradually decreases from one end closer to the main wing segment toward the other end farther from the main wing segment, and the height of the end wing segment is the distance between the suction-side edge and the pressure-side edge of the end wing segment at any position in its extension direction. The blade tip winglet has a thickness T2, 1≤h / T2≤5.

[0009] Optionally, the blade tip winglet has a thickness T2, and the groove has a depth s, 0.2≤s / T2≤0.8.

[0010] Optionally, the groove has a depth s and a width d, where the width d is the length of the groove in a direction perpendicular to its extension direction and its depth direction, and 0.8 ≤ d / s ≤ 5.

[0011] Optionally, the angle between the extension direction of the groove and the rotor axis is 60°-90°.

[0012] Optionally, the groove extends circumferentially, and the direction of extension of the groove is perpendicular to the rotor axis, wherein the circumferential direction is circumferential about the rotor axis. There is an axial distance g between two adjacent grooves in the rotor axis, and the blade tip winglet has an axial length L, which is the extension length of the blade tip winglet in the rotor axis, 0.06≤g / L≤0.35.

[0013] Optionally, the radial outer surface is provided with 2-12 grooves.

[0014] Optionally, at least one of the grooves is configured as a V-shaped groove, a U-shaped groove, a rectangular groove, an arc-shaped groove, or a trapezoidal groove.

[0015] Optionally, at least one of the grooves has a cross-section in a plane perpendicular to its extension direction, the width of which increases in the direction from the bottom of the groove to the top of the groove.

[0016] Optionally, the axial length of the blade tip winglet is 12-50 mm, the depth of the groove is 0.4-3 mm, and the width d of the groove is 1-5 mm.

[0017] Secondly, the present invention provides a fan, including blades as described in the above technical solution.

[0018] Thirdly, the present invention provides a range hood, including the fan described in the above technical solution.

[0019] The present invention has the following beneficial effects: A blade for a fan rotor, a fan, and a range hood are provided. The blade has a blade tip winglet on its radially outer edge. The blade tip winglet is connected to the radially outer edge of the blade and extends towards the suction side of the blade. The blade tip winglet includes a pressure side edge, a suction side edge, and a radially outer surface located between the pressure side edge and the suction side edge. Multiple grooves are spaced apart on the radially outer surface of the blade tip winglet, with both ends of each groove extending to the pressure side edge and the suction side edge, respectively. Thus, the groove connects the pressure side edge and the suction side edge of the blade tip winglet. Multiple airflow channels are provided between the pressure-side edge and suction-side edge of the blade tip winglet. The pressure-side fluid at the blade tip flows to the suction side of the blade through the airflow channels formed by the grooves. In this way, while the blade tip winglet weakens the leakage flow at the blade tip, the multiple airflow channels provided by the multiple grooves also allow multiple airflows to pass through the multiple grooves at the blade tip. After passing through the grooves, the multiple airflows generate multiple small-scale airflow vortices, which can destroy the large-scale blade tip airflow vortices. This reduces the airflow energy loss and airflow vortex noise caused by the large-scale airflow vortices at the blade tip, thereby improving the efficiency of the wind turbine. Attached Figure Description

[0020] To more clearly illustrate the technical solution of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of a wind turbine rotor structure including the blades provided by the present invention; Figure 2 This is another structural schematic diagram of a fan rotor including the blades provided by the present invention; Figure 3 This is a schematic diagram of the blade structure provided by the present invention; Figure 4 This is a schematic diagram of a cross-sectional structure of a blade provided according to the present invention.

[0022] Figure label: 10. Blades; 11. Suction side; 12. Pressure side; 13. Tip winglet; 131. Suction side edge; 132. Pressure side edge; 133. Radial outer surface; 134. Groove; 135. Main airfoil section; 136. End airfoil section. Detailed Implementation

[0023] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] It should be noted that the terms "first," "second," etc., in the specification, claims, and drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

[0025] Various exemplary embodiments, features, and aspects of this disclosure will now be described in detail with reference to the accompanying drawings. The same reference numerals in the drawings denote elements that have the same or similar functions. Although various aspects of the embodiments are shown in the drawings, they are not necessarily drawn to scale unless specifically indicated otherwise.

[0026] The term “exemplary” as used herein means “serving as an example, embodiment, or illustration.” Any embodiment illustrated herein as “exemplary” is not necessarily to be construed as superior to or better than other embodiments.

[0027] In this document, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent three cases: A alone, A and B simultaneously, and B alone. Furthermore, the term "at least one" in this document means any combination of at least two of any one or more elements. For example, including at least one of A, B, and C can mean including any one or more elements selected from the set consisting of A, B, and C.

[0028] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Since the embodiments disclosed in this invention can be arranged in different directions, these terms indicating direction are only for illustration and should not be regarded as limitations. For example, "upper" and "lower" are not necessarily limited to directions opposite to or consistent with the direction of gravity.

[0029] Furthermore, to better illustrate this disclosure, numerous specific details are set forth in the following detailed description. Those skilled in the art will understand that this disclosure can be practiced without certain specific details.

[0030] like Figure 1-4 As shown, the present invention provides a blade 10 for a fan rotor. The blade 10 is used in an axial flow fan or a mixed flow fan, and serves as a moving blade on the rotor of the axial flow fan or the mixed flow fan. The axial flow fan or the mixed flow fan is a fan in a range hood. The range hood can be an independent range hood or a fume extraction device in an integrated stove. The axial flow fan or the mixed flow fan can provide a suction effect for extracting fumes.

[0031] like Figure 2-3 As shown, the airflow enters the fan along direction M and flows through the fan rotor. The blade 10 includes a suction side 11 and a pressure side 12. The outer radial edge of the blade 10 is provided with a blade tip winglet 13. The blade tip winglet 13 is connected to the outer radial edge of the blade 10 and extends toward the suction side 11. Specifically, the blade tip winglet 13 folds from the outer radial edge of the blade 10 toward the suction side 11 of the blade 10.

[0032] like Figure 4 As shown, the included angle β between the blade tip winglet 13 and the suction side 11 surface of the blade is greater than or equal to 90°.

[0033] The blade tip winglet 13 extends along the radial outer edge of the blade 10. The side of the blade tip winglet 13 connected to the radial outer edge of the blade includes a pressure side edge 132, and the side of the blade tip winglet 13 away from the radial outer edge of the blade includes a suction side edge 131. The blade tip winglet 13 includes a radial outer surface 133, which is located between the pressure side edge 132 and the suction side edge 131.

[0034] A plurality of grooves 134 are provided at intervals on the radially outer surface 133 of the blade tip winglet 13. The two ends of the grooves 134 extend to the pressure side edge 132 and the suction side edge 131, respectively, thereby connecting the pressure side edge 132 and the suction side edge 131 of the blade tip winglet 13.

[0035] The blade provided in this embodiment achieves multiple airflow channels between the pressure-side edge 132 and the suction-side edge 131 of the blade tip winglet 13 by providing multiple grooves 134 on the radially outer surface 133 of the blade tip winglet 13. The airflow channels are formed by the grooves 134. The pressure-side fluid at the blade tip flows to the suction side of the blade through the airflow channels provided by the grooves 134. Thus, while weakening the leakage flow at the blade tip through the blade tip winglet 13, the gas passing through the grooves 134 forms an airflow through the multiple airflow channels provided by the multiple grooves 134. As a result, there are multiple airflows at the blade tip that pass through the multiple grooves 134 respectively. After passing through the grooves 134, the multiple airflows generate multiple small-scale airflow vortices, which can destroy the large-scale blade tip airflow vortices, thereby reducing the airflow energy loss and airflow vortex noise caused by the large-scale airflow vortices at the blade tip and improving the efficiency of the wind turbine.

[0036] In an optional embodiment, the blade 10 has an average thickness T1. Optionally, the blade 10 may have the same thickness or different thicknesses at various locations. For a blade 10 with the same thickness at various locations, the thickness at each location of the blade 10 is taken as its average thickness T1. For a blade 10 with different thicknesses at various locations, the average value of the corresponding thicknesses at each location of the blade 10 is taken as the average thickness T1 of the blade 10. The blade tip winglet 13 has a thickness T2, where 1 ≤ T2 / T1 ≤ 4, preferably 1 ≤ T2 / T1 ≤ 3. For example, the value of T2 / T1 is 1.2, 1.5, 1.8, 2, or 2.5.

[0037] Optionally, the average thickness T1 of the blade 10 is 0.5-4 mm, preferably 0.8-3.5 mm, such as 1 mm, 1.2 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm or 3.5 mm.

[0038] Optionally, the thickness T2 of the blade tip winglet 13 is 1.2-5 mm, preferably 1.5-4 mm, such as 1.8 mm, 2 mm, 2.5 mm, 3 mm or 3.5 mm.

[0039] The blade tip winglet 13 extends along the radial outer edge of the blade 10. In the direction of extension along the radial outer edge of the blade, the blade tip winglet 13 includes a main wing section 135 and two end wing sections 136 located at both ends of the main wing section 135. Figure 4The cross-sectional structure of the blade is shown in a predetermined plane passing through the main airfoil 135, which extends axially and radially along the wind turbine rotor. The main airfoil 135 has a uniform height h along its radial outer edge, the height h being the distance between the suction-side edge 131 and the pressure-side edge 132 of the main airfoil 135 at any position in its extension direction, the extension direction of the main airfoil 135 being substantially the same as the extension direction of the radial outer edge of the blade. The height of the tip airfoil 136 gradually decreases from one end closer to the main airfoil 135 toward the other end farther from the main airfoil 135, the height of the tip airfoil 136 being the distance between the suction-side edge 131 and the pressure-side edge 132 of the tip airfoil 136 at any position in its extension direction, the extension direction of the tip airfoil 136 being substantially the same as the extension direction of the radial outer edge of the blade, thereby the height of the tip winglets 13 gradually decreases in the tip sections at both ends.

[0040] Optionally, 1 ≤ h / T2 ≤ 5, preferably 1.2 ≤ h / T2 ≤ 4, for example, the value of h / T2 can be 1.5, 1.8, 2, 2.5, 3 or 3.5.

[0041] Optionally, the height h of the main wing section 135 is 1.2-12 mm, preferably 1.5-10 mm, especially 2-8 mm, such as 3 mm, 4 mm, 5 mm or 6 mm.

[0042] Optionally, the radial outer edge of the blade 10 includes a first outer edge segment and two second outer edge segments. The first outer edge segment is the outer edge segment of the radial outer edge that is connected to the main airfoil segment 135, and the second outer edge segment is the outer edge segment of the radial outer edge that is connected to the end airfoil segment 136. The first outer edge segment has a first extension length p, and the second outer edge segment has a second extension length q. 0.6≤p / (p+2q)≤0.98, preferably 0.7≤p / (p+2q)≤0.95. For example, the value of p / (p+2q) is 0.75, 0.8, 0.85, or 0.9.

[0043] In an alternative example, the blade tip winglets 13 have the same height h0 at all points along their extension direction which extends along the radial outer edge of the blade.

[0044] Optionally, 1 ≤ h0 / T2 ≤ 5, preferably 1.2 ≤ h0 / T2 ≤ 4. For example, the value of h0 / T2 can be 1.5, 1.8, 2, 2.5, 3 or 3.5.

[0045] Optionally, the height h0 of the main wing section 135 is 1.2-12 mm, preferably 1.5-10 mm, especially 2-8 mm, such as 3 mm, 4 mm, 5 mm or 6 mm.

[0046] The groove 134 has a depth s, which can be optionally 0.2≤s / T2≤0.8, preferably 0.3≤s / T2≤0.7, for example, the value of s / T2 is 0.4, 0.5, 0.55, 0.6 or 0.65.

[0047] Optionally, the depth s of the groove 134 is 0.4-4mm, preferably 0.6-3mm, such as 0.8mm, 1mm, 1.2mm, 1.5mm, 2mm or 2.5mm.

[0048] The groove 134 has a width d, which is the extension length of the groove 134 in the direction perpendicular to its extension direction and its depth direction, 0.8≤d / s≤5, preferably 1≤d / s≤3, for example, the value of d / s is 1.2, 1.5, 1.8, 2, 2.2, 2.5 or 3.5.

[0049] Optionally, the width d of the groove 134 is 1-5mm, preferably 1.2-4mm, such as 1.5mm, 1.8mm, 2mm, 2.2mm, 2.5mm, 2.8mm, 3mm or 3.5mm.

[0050] The angle between the extension direction of the groove 134 and the rotor axis is 60°-90°, preferably 70°-90°, and especially 80°-90°.

[0051] The grooves 134 have the same or different extension directions at various locations. For example, the grooves 134 include an air inlet section near the pressure side edge 132 of the blade tip winglet 13. The angle between the extension direction of the air inlet section and the rotor axis is less than 90°, and the air inlet section extends toward the air inlet end of the fan rotor, which facilitates the airflow into the groove.

[0052] Optionally, the grooves 134 may have the same direction of extension at all locations. For example, if the grooves 134 extend circumferentially and the direction of extension of the grooves 134 is perpendicular to the rotor axis, and the circumferential direction is around the rotor axis, then the grooves 134 generally provide an arc-shaped flow channel; or, if there is an angle between the direction of extension of the grooves 134 and the rotor axis, such as an angle of 80° or 85°, then the grooves 134 generally provide a spiral flow channel.

[0053] In a specific example, such as Figure 2As shown, the groove 134 extends circumferentially, and the extension direction of the groove 134 is perpendicular to the rotor axis. There is an axial distance g between two adjacent grooves 134 in the rotor axis. The blade tip winglet 13 has an axial length L, which is the extension length of the blade tip winglet 13 in the rotor axis. 0.06≤g / L≤0.35, preferably 0.1≤g / L≤0.3. For example, the value of g / L is 0.08, 0.12, 0.15, 0.18, 0.2, 0.22 or 0.25.

[0054] Optionally, the axial length L of the blade tip winglet 13 is 12-50mm, preferably 15-45mm, for example, 18mm, 20mm, 22mm, 25mm, 30mm, 35mm or 40mm.

[0055] Optionally, the axial spacing g between two adjacent grooves 134 is 1.5-8 mm, preferably 2-6 mm, for example, 2.5 mm, 2.8 mm, 3 mm, 3.5 mm, 4 mm, 4.5 mm or 5 mm.

[0056] Optionally, the radial outer surface 133 is provided with 2-12 grooves, preferably 4-10 grooves, such as 3, 5, 6 or 8 grooves.

[0057] Optionally, at least one of the grooves 134 has a cross-section in a plane perpendicular to its extension direction, the width of which increases or remains constant in the direction from the bottom of the groove 134 to the top of the groove, preferably gradually increasing.

[0058] For example, the cross-section of the groove 134 is triangular, inverted arch, trapezoidal, rectangular, or semi-circular. Optionally, at least one of the grooves 134 is configured as a V-shaped groove, U-shaped groove, rectangular groove, arc-shaped groove, circular arc groove, or trapezoidal groove. The cross-sectional shape of the groove 134 is not limited to the above shapes, and the cross-sectional shape of the groove 134 can be configured into other shapes.

[0059] This invention also provides a fan, which is an axial flow fan or a mixed flow fan, used in a range hood, and includes blades 10 as described in the above technical solution.

[0060] Specifically, the fan includes a fan housing, an air inlet at one end of the housing, a rotor inside the fan housing, and a moving blade. The moving blade is preferably mounted on a hub, which is connected to a motor. The moving blade is constructed as blade 10 as described in the above technical solution, and the blade tip winglet 13 of the blade 10 is disposed opposite to the inner surface of the fan housing.

[0061] This invention also provides a range hood, including the fan described in the above technical solution.

[0062] Specifically, the range hood includes a fan frame and a smoke collection hood. The smoke collection hood is provided with an airflow inlet, and the fan is installed inside the fan frame. The airflow inlet of the smoke collection hood is connected to the air inlet of the fan.

[0063] Optionally, the fume extraction device can be a standalone range hood or a fume extraction device within an integrated stove.

[0064] The above-disclosed embodiments are merely a few preferred embodiments of the present invention and should not be construed as limiting the scope of the present invention. Therefore, any equivalent variations made in accordance with the claims of the present invention are still within the scope of the present invention.

Claims

1. A blade (10) for a fan rotor, the blade (10) comprising a suction side (11) and a pressure side (12), the outer radial edge of the blade (10) being provided with a blade tip winglet (13), the blade tip winglet (13) being connected to the outer radial edge of the blade (10) and extending toward the suction side (11); Its features are, The blade tip winglet (13) includes a pressure side edge (132), a suction side edge (131), and a radially outer surface (133) located between the pressure side edge (132) and the suction side edge (131). A plurality of grooves (134) are provided at intervals on the radially outer surface (133) of the blade tip winglet (13), and the two ends of the grooves (134) extend to the pressure side edge (132) and the suction side edge (131), respectively.

2. The blade (10) according to claim 1, characterized in that, The average thickness T1 of the blade (10) and the thickness T2 of the blade tip winglet (13) satisfy: 1≤T2 / T1≤4.

3. The blade (10) according to claim 2, characterized in that, The average thickness T1 is 0.5-4 mm, and the thickness T2 is 1.2-5 mm.

4. The blade (10) according to any one of claims 1-3, characterized in that, The blade tip winglet (13) includes a main wing section (135) and two end wing sections (136) located at both ends of the main wing section (135). The main wing section (135) has a height h, which is the distance between the suction side edge (131) and the pressure side edge (132) of the main wing section (135) at any position in its extension direction. The height of the end wing section (136) gradually decreases from one end closer to the main wing section (135) toward the other end farther from the main wing section (135), and the height of the end wing section (136) is the distance between the suction side edge (131) and the pressure side edge (132) of the end wing section (136) at any position in its extension direction. The blade tip winglet (13) has a thickness T2, 1≤h / T2≤5.

5. The blade (10) according to any one of claims 1-3, characterized in that, The blade tip winglet (13) has a thickness T2, and the groove (134) has a depth s, 0.2≤s / T2≤0.

8.

6. The blade (10) according to any one of claims 1-3, characterized in that, The groove (134) has a depth s and a width d, the width d being the extension length of the groove (134) in a direction perpendicular to its extension direction and its depth direction, 0.8≤d / s≤5.

7. The blade (10) according to any one of claims 1-3, characterized in that, The angle between the extension direction of the groove (134) and the rotor axis is 60°-90°.

8. The blade (10) according to claim 7, characterized in that, The groove (134) extends circumferentially, and the direction of extension of the groove (134) is perpendicular to the rotor axis, the circumferential direction being the circumferential direction around the rotor axis; There is an axial distance g between two adjacent grooves (134) in the rotor axis, and the blade tip winglet (13) has an axial length L, which is the extension length of the blade tip winglet (13) in the rotor axis, 0.06≤g / L≤0.

35.

9. The blade (10) according to any one of claims 1-3, characterized in that, The radial outer surface (133) is provided with 2-12 grooves (134).

10. The blade (10) according to any one of claims 1-3, characterized in that, At least one of the grooves (134) is configured as a V-shaped groove, a U-shaped groove, a rectangular groove, an arc groove or a trapezoidal groove; Alternatively, at least one of the grooves (134) has a cross-section in a plane perpendicular to its extension direction, the width of which increases in the direction from the bottom of the groove to the top of the groove.

11. The blade (10) according to any one of claims 1-3, characterized in that, The axial length of the blade tip winglet (13) is 12-50 mm, the depth of the groove (134) is 0.4-3 mm, and the width d of the groove (134) is 1-5 mm.

12. A fan, characterized in that, Includes the blade (10) as described in any one of claims 1-11.

13. A range hood, characterized in that, Including the wind turbine as described in claim 12.

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