Wind wheel assembly, fan and range hood

Abstract

The invention discloses a wind wheel assembly, a draught fan and a range hood, the wind wheel assembly comprises a first wind wheel, the first wind wheel comprises a first frame body and a plurality of first blades, and the first blades are distributed in the circumferential direction of the first frame body at intervals to form an air inlet space; each first blade is provided with a front edge surface facing the air inlet space and a rear edge surface opposite to the air inlet space; at least one end of the front edge face is provided with a flow guide face, and the flow guide face is used for guiding smoke in the air inlet space. According to the embodiment, the flow guide faces are arranged at the end portions of the front edge faces of the blades, smoke in the air inlet space can flow along the flow guide faces at the end portions of the front edge faces, and the smoke is in smooth transition through the flow guide faces, so that the flowing rule of vortexes is destroyed, vortexes generated by the smoke at the end portions of the first blades are reduced, and airflow loss is reduced; therefore, the air guide efficiency of the first blades is improved, and the effects of reducing noise and increasing air volume are achieved.

Description

Technical Field

[0001] This application relates to the field of kitchen appliance technology, and in particular to a fan assembly, a fan, and a range hood. Background Technology

[0002] Range hoods are an essential kitchen appliance in modern homes. They operate on the principles of fluid dynamics, using a fan installed inside to draw in and exhaust cooking fumes. If the fan generates excessive eddies during operation, it can result in significant aerodynamic noise from the range hood. Summary of the Invention

[0003] This application provides a wind turbine assembly, a fan, and a range hood, which can reduce eddy current intensity and reduce the operating noise of the range hood.

[0004] This application provides a wind turbine assembly, including:

[0005] The first wind turbine includes a first frame and a plurality of first blades. The plurality of first blades are distributed circumferentially along the first frame to form an air intake space. Each first blade has a leading edge surface facing the air intake space and a trailing edge surface facing away from the air intake space.

[0006] The leading edge surface is provided with a guide surface at at least one end, which is used to guide the flue gas in the intake space.

[0007] In some embodiments of this application, the guiding surface is a guiding slope.

[0008] In some embodiments of this application, the first blade has a first end face located between the leading edge surface and the trailing edge surface, and the first end face is connected to the first frame; the guide surface is formed by a guide slope, the guide slope extends from the leading edge surface to the first end face, and the guide slope is set at an angle to the first end face; or, the guide surface is formed by a plurality of guide slopes connected sequentially, the plurality of guide slopes are connected sequentially between the leading edge surface and the first end face, and at least two of the plurality of guide slopes have different inclination angles relative to the first end face.

[0009] In some embodiments of this application, the guide surfaces are provided at both ends of the leading edge surface.

[0010] In some embodiments of this application, the first blade has a first end face and a second end face disposed opposite to each other, at least one of the first end face and the second end face being connected to the first frame, and the leading edge face, the first end face, the trailing edge face and the second end face being connected in sequence; the guide surface located at the first end of the leading edge face is a first guide slope, the first guide slope extending from the leading edge face to the first end face, and the first guide slope and the first end face being disposed at an angle; the guide surface located at the second end of the leading edge face is a second guide slope, the second guide slope extending from the leading edge face to the second end face, and the second guide slope and the second end face being disposed at an angle.

[0011] In some embodiments of this application, the orthographic projections of the leading edge surface and the trailing edge surface on the first reference plane have corresponding leading edge lines and trailing edge lines. The first reference plane is parallel to the second end face. The leading edge line has a first endpoint close to the air intake space, and the trailing edge line has a second endpoint away from the air intake space. The length of the line connecting the orthographic projections of the first endpoint and the second endpoint on the first reference plane is W1. The second reference plane passes through the first endpoint and the second endpoint, and the second reference plane is perpendicular to the first reference plane. The orthographic projection length of the first guide slope on the second reference plane is W2, where W2 satisfies 0.1W1≤W2≤0.5W1. And / or, the orthographic projection length of the second guide slope on the second reference plane is W3, where W3 satisfies 0.1W1≤W3≤0.5W1.

[0012] In some embodiments of this application, the orthographic projections of the first guide slope and the second guide slope on the second reference plane have corresponding first guide slope lines and second guide slope lines; wherein, the length of the first guide slope line is R1, and the length of the second guide slope line is R2, wherein R1≤R2.

[0013] Secondly, embodiments of this application provide a fan, including a flue casing and a fan assembly as described in any of the above embodiments. The flue casing includes a housing, the housing having a wind cavity and an air inlet and an air outlet communicating with the wind cavity, and the fan assembly is disposed within the wind cavity.

[0014] In some embodiments of this application, the housing includes a first end plate, a second end plate, and a peripheral side plate, with the second end plate spaced apart from the first end plate; the peripheral side plate is located between the first end plate and the second end plate, and the first end plate, the peripheral side plate, and the second end plate together form the air cavity and the air outlet, with the air inlet provided on the first end plate and / or the second end plate; wherein, the outer contour of the peripheral side plate projected onto a first plane includes a first arc, a clearance line, and a second arc arranged sequentially and connected along the circumferential direction of the peripheral side plate, the first plane is perpendicular to the axis of the air inlet, the radius of curvature at each point on the second arc is greater than the radius of curvature at each point on the first arc, and the radius of curvature at each point on the clearance line is greater than the radius of curvature at each point on the second arc.

[0015] In some embodiments of this application, the peripheral side plate is connected to and perpendicular to the first end plate and the second end plate; or, both ends of the peripheral side plate are provided with arc-shaped transition portions, the first end of the peripheral side plate is connected to the first end plate through one of the arc-shaped transition portions, and the second end of the peripheral side plate is connected to the second end plate through another arc-shaped transition portion.

[0016] In some embodiments of this application, the maximum length of the first end plate and the second end plate along the first direction is H, and the maximum length of the first end plate and the second end plate along the second direction is W, where H < 600 mm and W < 600 mm; wherein, the first direction is parallel to the axial direction of the air outlet, the second direction is perpendicular to the first direction, and the second direction is parallel to the first plane.

[0017] In some embodiments of this application, the orthographic projection of the centerline of the air inlet onto the first plane is point O. The first plane has a first axis, a first reference point, and a second reference point. The first axis is parallel to the second direction and intersects point O. The first reference point and the second reference point are symmetrically distributed about the first axis, and the distance between the first reference point and the second reference point is d, 0.25H≤d≤0.5H. The first axis and the avoidance line have a first intersection point. In the second direction, the shortest distance from the first intersection point to the straight line passing through the first reference point and the second reference point is a, 0.2W≤a≤0.5W. The distance from the flow point on the avoidance line to the first reference point is r1, and the distance from the flow point to the second reference point is r2, (0.25d). 2 ≤r²×r²≤(0.36d) 2 .

[0018] In some embodiments of this application, a guide ring is provided at the air inlet; the guide ring is provided in an arc shape facing away from the air suction cavity, and / or, a second guide structure is provided on the side of the guide ring facing the axis of the air inlet.

[0019] Thirdly, this application provides a range hood, including a main body and a fan as described in the above embodiments. The main body is provided with a flue and an exhaust port communicating with the flue. The flue is connected to the air inlet. The fan is disposed inside the main body. The fan draws smoke from the exhaust port into the flue and the air inlet, and discharges the smoke from the exhaust port into the range hood.

[0020] Based on the impeller assembly, fan, and range hood in this application embodiment, this embodiment provides a guide surface at the leading edge end of the blade, allowing the flue gas in the intake space to flow along the guide surface at the leading edge end. Since the flue gas transitions smoothly through the guide surface, the flow pattern of the vortex is disrupted, reducing the generation of vortices at the end of the first blade, reducing airflow loss, and thereby improving the wind guiding efficiency of the first blade, achieving the effects of noise reduction and increased air volume. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, 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 this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the wind turbine assembly in one embodiment of this application;

[0023] Figure 2 This is a schematic diagram of the structure of the first blade in one embodiment of this application and a projection view of the first blade on a first reference plane;

[0024] Figure 3 This is a schematic diagram of the structure of the first blade in one embodiment of this application;

[0025] Figure 4 This is a schematic diagram of the structure of a fan in one embodiment of this application;

[0026] Figure 5 This is a cross-sectional structural diagram of the shell in one embodiment of this application;

[0027] Figure 6 This is a cross-sectional structural diagram of a fan in one embodiment of this application;

[0028] Figure 7This is a schematic projection of the flue casing of the smoke machine onto a first plane in one embodiment of this application;

[0029] Figure 8 This is a cross-sectional structural diagram of the shell in one embodiment of this application;

[0030] Figure 9 For Cassini's oval line;

[0031] Figure 10 The table presents a comparison curve of the airflow at the outlet of the volute casing of the smoke hood in this application and a comparison table of noise test results with the volute casings of smoke hoods in related technologies.

[0032] Figure 11 This is a schematic diagram of the structure of a range hood in one embodiment of this application.

[0033] Figure label:

[0034] 200, Wind turbine assembly; 20, First wind turbine; 201, First frame; 2011, Air intake space; 202, First blade; 202a, Guide surface; 202a1, Guide slope; 2021, Leading edge surface; 2021a, Leading edge line; 2022, Trailing edge surface; 2022a, Trailing edge line; 2023, First end face; 2024, Second end face; 2025, Pressure surface; 2025a, Pressure line; 2026, Suction surface; 203, First guide structure;

[0035] 1000, Fan; 100, Smoke hood volute; 10, Housing; 101, First end plate; 102, Second end plate; 103, Peripheral side plate; 1031, First arc surface; 103a, First arc line; 1032, Clearance surface; 103b, Clearance line; 1033, Second arc surface; 103c, Second arc line; 104, Arc-shaped transition section; 105, Air inlet; 106, Air outlet; 107, Air cavity; 24, Guide ring; 25, Second guide structure;

[0036] 2000, Range hood; 300, Main body; 301, Air extraction port; 13, Check valve; 14, Top plate;

[0037] XX, first direction; YY, second direction; M, first axis. Detailed Implementation

[0038] To more clearly illustrate the technical solutions in the embodiments of this application or related technologies, a clear and complete description will be provided below with reference to the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0039] When a range hood is working, it uses a fan installed inside to exhaust and draw in cooking fumes. As the fan blades rotate, the fan generates negative pressure, drawing fumes from below or to the sides of the hood into the ductwork and then expelling them outdoors. During operation, the rotating fan blades cause pulsations in the surrounding air, generating noise, and the fluid within the fan's ductwork also produces noise due to eddies. This results in a significant amount of aerodynamic noise when the range hood is operating.

[0040] Regarding the above situation, firstly, please refer to [link / reference needed]. Figure 1 This application proposes a wind turbine assembly 200, including a first wind turbine 20. The first wind turbine 20 includes a first frame 201 and a plurality of first blades 202. The plurality of first blades 202 are distributed at intervals along the circumference of the first frame 201 to form an air intake space 2011. That is, the first frame 201 is cylindrical, and the plurality of first blades 202 are evenly arranged on the periphery of the cylindrical first frame 201 to form a near-air space in the middle of the cylindrical shape. At the same time, the first frame 201 has an opening communicating with the air intake space 2011, and external flue gas can enter the air intake space 2011 through the opening.

[0041] like Figures 1-3 As shown, each first blade 202 has a leading edge surface 2021 facing the intake space 2011 and a trailing edge surface 2022 facing away from the intake space 2011. During the outward discharge of flue gas from the intake space 2011, the flue gas first contacts the leading edge surface 2021 of the first blade 202, and then exits the intake space 2011 from the trailing edge surface 2022 of the first blade 202. At least one end of the leading edge surface 2021 is provided with a guide surface 202a, which can be used to guide the flue gas within the intake space 2011.

[0042] It is easy to understand that in related technologies, the blades of a wind turbine are set at right angles. When the wind turbine rotates and forms airflow, the airflow passes through the blade tips. The right-angle design of the blade tips easily causes vortices to form in the flue gas at the blade tips, resulting in adverse phenomena such as reduced exhaust efficiency and increased noise. In this application, the flue gas in the intake space 2011 can flow along the guide surface 202a at the end of the leading edge surface 2021. The setting of the guide surface 202a allows the flue gas in the intake space 2011 to change its flow path when passing through the guide surface 202a, reducing or eliminating the vortex area generated by the flue gas directly impacting the first blade 202. In other words, because the flue gas has a smooth transition through the guide surface 202a, the flow law of vortices is disrupted, reducing the generation of vortices at the end of the first blade 202, reducing airflow loss, and thus improving the air guiding efficiency of the first blade 202, achieving the effects of noise reduction and increased air volume.

[0043] Please see Figure 3 In some embodiments of this application, the first blade 202 is a backward-curved blade, which can increase the air pressure of the flue gas exhaust in the intake space 2011. That is, the first blade 202 has a concave portion and a convex portion that are arranged opposite to each other. The outer surface of the concave portion of the first blade 202 is the pressure surface 2025, which refers to the side that the fluid contacts when passing through the first blade 202, that is, the airflow pressure generated by the fluid on this side is greater. The outer surface of the convex portion of the first blade 202 is the suction surface 2026, which refers to the airflow pressure generated by the fluid on this side is lower.

[0044] Furthermore, such as Figure 2 As shown in (Ⅰ), in some embodiments of this application, the first blade 202 has a first end face 2023 and a second end face 2024 disposed opposite to each other. At least one of the first end face 2023 and the second end face 2024 is connected to the first frame 201. The leading edge surface 2021, the first end face 2023, the trailing edge surface 2022 and the second end face 2024 are connected in sequence. The flow guiding surface 202a can be a flow guiding slope 202a1. One end of the flow guiding slope 202a1 is connected to the leading edge surface 2021 and the other end of the flow guiding slope 202a1 is connected to the first end face 2023. The flow guiding slope 202a1 and the second end face 2024 are arranged at an angle, and the angle is between 0 and 90°.

[0045] Optionally, the guide surface 202a includes a guide slope 202a1. That is, the guide surface 202a is equivalent to cutting the leading edge surface 2021 of the first blade 202 with a line segment, so that the guide slope 202a1 extends from the leading edge surface 2021 to the first end surface 2023, and the guide slope 202a1 and the first end surface 2023 are set at an angle. This allows the flue gas in the intake space 2011 to flow from the leading edge surface 2021 along the inclined surface of the guide slope 202a1, reducing the generation of eddies in the flue gas at the end position of the first blade 202.

[0046] Optionally, the guide surface 202a includes multiple guide slopes 202a1. That is, the guide surface 202a is equivalent to continuously cutting the leading edge surface 2021 of the first blade 202 with multiple line segments, so that the multiple guide slopes 202a1 are connected sequentially between the leading edge surface 2021 and the first end face 2023, and at least two of the multiple guide slopes 202a1 have different inclination angles relative to the first end face 2023. The specific processing can be selected according to the actual situation. For example, the guide surface 202a includes two guide slopes 202a1, which are connected sequentially between the leading edge surface 2021 and the first end surface 2023. The two guide slopes 202a1 and the first end surface 2023 have different inclination angles. By setting two guide slopes 202a1, a certain angle can be formed between the two guide slopes 202a1 (the connection of the two guide slopes 202a1 is convex towards the leading edge surface 2021). The angles between the guide slopes 202a1 and the leading edge surface 2021, and between the guide slopes 202a1 and the first end surface 2023 are small, so that the transition of flue gas at the end position of the first blade 202 is relatively smooth.

[0047] like Figure 2 As shown in (Ⅰ), in some embodiments of this application, guide surfaces 202a are provided at both ends of the leading edge surface 2021 of the first blade 202, thereby further reducing the eddies generated by the flue gas in the intake space 2011 when it flows through the first blade 202. The guide surfaces 202a at the opposite ends of the leading edge surface 2021 are spaced apart; or, the ends of the guide surfaces 202a at the opposite ends of the leading edge surface 2021 are connected to each other.

[0048] Specifically, such as Figure 2 As shown in (Ⅰ), the guide surface 202a at the first end of the leading edge surface 2021 is a first guide slope, the first guide slope 202a1 extends from the leading edge surface 2021 to the first end surface 2023, and the first guide slope and the first end surface 2023 are set at an angle; the guide surface 202a at the second end of the leading edge surface 2021 is a second guide slope, the second guide slope extends from the leading edge surface 2021 to the second end surface 2024, and the second guide slope and the second end surface 2024 are set at an angle. The left and right ends of the pressure surface 2025 are connected to the leading edge surface 2021 and the trailing edge surface 2022, respectively. The upper and lower ends of the pressure surface 2025 are connected to the first end surface 2023 and the second end surface 2024, respectively. The left and right ends of the suction surface 2026 are connected to the leading edge surface 2021 and the trailing edge surface 2022, respectively. The upper and lower ends of the suction surface 2026 are connected to the first end surface 2023 and the second end surface 2024, respectively, thereby forming a three-dimensional first blade 202 structure.

[0049] It is easy to understand that when the flue gas in the intake space 2011 passes through the guide surface 202a, it can directly exit the intake space 2011 through the first guide slope and the second guide slope. That is, the first guide slope and the second guide slope can more precisely control the flow path of the flue gas when entering the first blade 202. This streamlined design helps to reduce the separation and turbulence of the flue gas at the leading edge surface 2021 of the first blade 202, thereby improving the stability and uniformity of the flue gas flow.

[0050] Further, please see Figure 2 In some embodiments of this application, the first reference plane is parallel to the second end face 2024, as indicated by (Ⅰ), (Ⅱ), and (Ⅲ). It can be understood that the first reference plane can be the plane through which the second end face 2024 passes. The orthographic projection of the leading edge surface 2021 onto the first reference plane has a corresponding leading edge line 2021a, and the orthographic projection of the trailing edge surface 2022 onto the first reference plane has a corresponding trailing edge line 2022a. Figure 2 In the diagram (Ⅲ), the first blade 202 is projected onto the first reference plane. The leading edge line 2021a and the trailing edge line 2022a are inclined relative to the intake space 2011. Therefore, the leading edge line 2021a has a first endpoint E1 close to the intake space 2011, and the trailing edge line 2022a has a second endpoint E2 far from the intake space 2011. The length of the line connecting the first endpoint E1 and the second endpoint E2 on the first reference plane is W1. It can be understood that the pressure surface 2025 of the first blade 202 has a corresponding pressure line 2025a projected onto the first reference plane. In the direction perpendicular to the line connecting the two endpoints of the pressure line 2025a, the maximum width of the first blade 202 is W1.

[0051] The second reference plane passes through the first endpoint E1 and the second endpoint E2, and is perpendicular to the first reference plane. Figure 2(II) shows the orthographic projection length of the guide slope 202a1 on the first blade 202 onto the second reference plane. Optionally, the orthographic projection length of the first guide slope on the second reference plane is W2, where W2 satisfies 0.1W1≤W2≤0.5W1. For example, W2 can be a range consisting of 0.1W1, 0.2W1, 0.3W1, 0.4W1, 0.5W1, or any two of them. Optionally, the orthographic projection length of the second guide slope on the second reference plane is W3, where W3 satisfies 0.1W1≤W3≤0.5W1. For example, W3 can be a range consisting of 0.1W1, 0.2W1, 0.3W1, 0.4W1, 0.5W1, or any two of them. In this embodiment, by limiting the dimensions of the two guide surfaces 202a on the first blade 202, the flow path of the flue gas at the leading edge surface 2021 of the first blade 202 can be further fine-tuned. This fine-tuning helps to reduce the separation and eddies of the flue gas at the leading edge surface 2021 of the first blade 202, thereby improving the stability and uniformity of the flue gas flow.

[0052] Furthermore, in some embodiments of this application, the first guide slope and the second guide slope, when projected onto the second reference plane, have corresponding first guide slope lines and second guide slope lines. The length of the first guide slope line is R1, and the length of the second guide slope line is R2, where R1 ≤ R2.

[0053] Optionally, the first guide slope and the second guide slope can be the same, that is, the first guide slope and the second guide slope are the same; alternatively, the length of the second guide slope is longer than the length of the first guide slope, that is, the second guide slope is larger than the first guide slope, so that more flue gas in the intake space 2011 can flow along the guide surface 202a to increase the air volume at the first blade 202.

[0054] It should be noted that the first frame 201 has two openings that are arranged opposite to each other. The first guide slope and the second guide slope are respectively adjacent to the two different openings on the first frame 201. When the air intake volume of the two openings is different, the opening with the larger air intake volume is set to correspond to the guide slope with the larger orthographic projection length, that is, the opening with the larger air intake volume is set to correspond to the second guide slope.

[0055] Please see Figure 3In some embodiments of this application, at least one of the leading edge surface 2021 and the trailing edge surface 2022 is provided with a first flow guiding structure 203. The first flow guiding structure 203 extends along the axial direction of the first impeller 20, and the arrangement of the first flow guiding structure 203 can guide the flue gas in the air intake space 2011. The first flow guiding structure 203 can be a serrated structure. Taking the serrated first flow guiding structure 203 on the trailing edge surface 2022 as an example, the serrated first flow guiding structure 203 can disrupt the flow pattern of eddies, thereby weakening or even eliminating the eddy phenomenon, achieving the effects of noise reduction and increased airflow.

[0056] Secondly, please see Figures 4-5 This application also provides a fan 1000, including a flue hood volute 100 and a fan wheel assembly 200 as described in any of the above embodiments. The flue hood volute 100 includes a housing 10, which has a wind cavity 107 and an air inlet 105 and an air outlet 106 communicating with the wind cavity 107. The fan wheel assembly 200 is disposed in the wind cavity 107.

[0057] It should be noted that the casing 10 of the flue gas hood volute 100 has an air inlet 105 and an air outlet 106. When the impeller assembly 200 is installed inside the casing 10, the opening on the first frame 201 corresponds to the air inlet 105 on the casing 10, and the axis of the impeller assembly 200, which is also the axis of the first frame 201, is collinear with the axis of the air inlet 105 on the casing 10. A centrifugal fan 1000 is installed in the first frame 201 of the impeller assembly 200. When the centrifugal fan 1000 starts, external flue gas can enter the opening and the intake space 2011 from the air inlet 105. At the same time, the drive motor starts, which drives the entire impeller assembly 200 to rotate around its axis inside the casing 10. As the impeller assembly 200 rotates, the first blades 202 drive the flue gas in the intake space 2011 to rotate, thus doing work on the flue gas, increasing its energy, and simultaneously causing the flue gas to rotate under centrifugal force. The flue gas is thrown out from the circumference of the downward impeller assembly 200 and enters the air chamber 107. Then, the velocity energy of the flue gas is converted into pressure energy by the housing 10 and discharged from the air outlet 106 on the housing 10. After the flue gas in the impeller assembly 200 is discharged, the pressure inside the impeller assembly 200 is lower than the pressure at the air inlet 105 of the housing 10. Therefore, the flue gas outside the flue gas volute 100 will be drawn into the impeller assembly 200 under the action of the pressure difference, so that the flue gas can continuously enter the impeller assembly 200 and be discharged by the centrifugal fan 1000.

[0058] Please continue reading Figures 4-5In some embodiments of this application, the housing 10 includes a first end plate 101, a second end plate 102, and a peripheral side plate 103. The first end plate 101 and the second end plate 102 are arranged at a distance from each other. The peripheral side plate 103 is located between the first end plate 101 and the second end plate 102. The peripheral side plate 103, the first end plate 101, and the second end plate 102 together form a wind cavity 107 and an air outlet 106. An air inlet 105 is provided on the first end plate 101 and / or the second end plate 102. The housing 10 may have an air inlet 105 communicating with the air cavity 107, meaning that the air intake method of the range hood volute 100 is single-sided air intake; or, the first end plate 101 and the second end plate 102 may both have air inlets 105 communicating with the air cavity 107, meaning that the air intake method of the range hood volute 100 is double-sided air intake. The flue gas can be drawn into the air cavity 107 through the air inlet 105 on the housing 10 under the action of the centrifugal fan 1000, and then discharged from the air outlet 106.

[0059] The outer contour of the peripheral side plate 103 projected onto the first plane includes a first arc line 103a, a clearance line 103b, and a second arc line 103c arranged sequentially and connected along the circumferential direction of the peripheral side plate 103. For example, in... Figure 7 In the diagram, the first arc 103a and the second arc 103c are dashed lines, while the avoidance line 103b is a solid line. The first plane is perpendicular to the axis of the air inlet 105. The radius of curvature at all points on the second arc 103c is greater than that at all points on the first arc 103a, and the curvature of the second arc 103c is less than that of the first arc 103a. The second arc 103c is smoother overall than the first arc 103a. The radius of curvature at all points on the avoidance line 103b is greater than that on the second arc 103c. It can be understood that the radius of curvature of the avoidance line 103b is the largest compared to the first and second arcs 103a and 103c. In other words, the curvature of the avoidance line 103b is less than that of the first and second arcs 103a and 103c, and the avoidance line 103b is smoother overall (more closely approximating a straight line).

[0060] Specifically, such as Figures 6-7As shown, the outer peripheral side surface of the peripheral side plate 103 includes a first arc surface 1031, a clearance surface 1032, and a second arc surface 1033 arranged sequentially and connected along the circumferential direction of the peripheral side plate 103. The two ends of the clearance surface 1032 are connected to the first arc surface 1031 and the second arc surface 1033, respectively. The orthographic projection of the first arc surface 1031 on the first plane corresponds to the first arc line 103a, the orthographic projection of the clearance surface 1032 on the first plane corresponds to the clearance line 103b, and the orthographic projection of the second arc surface 1033 on the first plane corresponds to the first arc line 103a. Corresponding to the two arcs 103c, the avoidance line 103b and the first arc 103a and the second arc 103c are all arc-shaped transition lines. That is to say, the avoidance surface 1032 and the first arc surface 1031 and the second arc surface 1033 are all arc-shaped transitions. Compared with the transition between two planes at an angle, the arc-shaped transition can prevent the two surfaces from having sharp corners at the connection. The arc-shaped transition is more in line with the flow pattern of airflow and can reduce the backflow and eddy phenomenon of flue gas caused by sharp corners (such as right angles, acute angles or obtuse angles).

[0061] It should be noted that the range hood housing 100 is installed within the installation space of the range hood 2000. Therefore, the volume of the range hood housing 100 is limited by the installation space of the range hood 2000. This is because the radius of curvature at various points on the clearance line 103b is the largest compared to the first arc 103a and the second arc 103c. Therefore, the clearance line 103b is smoother than the first arc 103a and the second arc 103c. If the side of the range hood housing 100 exceeds the installation space... In this area, the outer contour of the side of the range hood volute 100 projected onto the first plane can be set as the shape of the avoidance line 103b. This reduces the side protrusion height of the range hood volute 100, thereby reducing the volume of the range hood volute 100. At the same time, it can also improve the flow of smoke at the avoidance surface 1032 of the range hood volute 100, reduce the backflow and eddy current phenomenon of smoke at the avoidance surface 1032 of the range hood volute 100, and reduce the noise generated by the range hood volute 100 when smoking.

[0062] Please see Figure 5In some embodiments of this application, the peripheral side plate 103 is connected to and perpendicular to the first end plate 101 and the second end plate 102. Specifically, the connection points between the peripheral side plate 103 and the first end plate 101 and the second end plate 102 are all set at 90° right angles, which facilitates the production and connection between the first end plate 101, the peripheral side plate 103 and the second end plate 102. For example, the first end plate 101 and the second end plate 102 can be planar plate structures, and the peripheral side plate 103 can be formed by bending a long strip of planar plate structure along its length direction. The side of the planar plate structure can be directly connected to the side of the peripheral side plate 103 along its width direction. This not only reduces the mold opening cost of the range hood volute 100, but also reduces the manufacturing difficulty of the range hood volute 100, thereby facilitating the mass production of the range hood volute 100.

[0063] Alternatively, please see Figure 8 In some embodiments, arc-shaped transition portions 104 are provided at both ends of the peripheral side plate 103. The first end of the peripheral side plate 103 is connected to the first end plate 101 through an arc-shaped transition portion 104, and the second end of the peripheral side plate 103 is connected to the second end plate 102 through another arc-shaped transition portion 104. This allows both end plates to be connected to the peripheral side plate 103 using an arc-shaped transition. An arc-shaped transition is different from a right-angle transition. For example, a right-angle design in the volute can easily cause backflow and eddy currents of flue gas inside the volute, resulting in reduced fume extraction efficiency and increased noise. In this application, the arc-shaped transition method ensures that there are no sharp corners at the connection between the two surfaces. The arc-shaped transition is more in line with the airflow pattern, avoiding sharp corners, reducing airflow loss, and improving efficiency. Therefore, this application uses arc-shaped transition portions 104 to connect the end plate and the peripheral side plate 103, thereby reducing flue gas backflow and eddy currents inside the volute 100 of the range hood.

[0064] Please see Figure 6 In some embodiments of this application, the maximum length of the first end plate 101 and the second end plate 102 along the first direction XX is H, and the maximum length of the first end plate 101 and the second end plate 102 along the second direction YY is W, where H < 600 mm and W < 600 mm; wherein, the first direction XX is parallel to the first plane and the axis of the air outlet 106, the second direction YY is perpendicular to the first direction XX, and the second direction YY is parallel to the first plane.

[0065] Further, please see Figure 7In some embodiments of this application, the centerline of the air inlet 105 is projected onto the first plane as point O. The first plane has a first axis M, a first reference point C1, and a second reference point C2. The first axis M is parallel to the second direction YY and intersects with point O. The first reference point C1 and the second reference point C2 are symmetrically distributed about the first axis M, and the distance between the first reference point C1 and the second reference point C2 is d, where 0.25H≤d≤0.5H. The first axis M and the avoidance line 103b have a first intersection point Q. In the second direction YY, the shortest distance from the first intersection point Q to the straight line passing through the first reference point C1 and the second reference point C2 is a, where 0.2W≤a≤0.5W.

[0066] It is easy to understand that, in the first plane, the orthographic projections of the first reference point C1 and the second reference point C2 are both located inside the orthographic projection of the first end plate 101. The first axis M is taken as the x-axis, and the straight line perpendicular to the first axis M and passing through the first intersection point Q is taken as the y-axis. The coordinates of the first intersection point are the coordinates of the origin (0, 0). At this time, the coordinates of the first reference point C1 are (-a, 0.5d), and the coordinates of the second reference point C2 are (-a, -0.5d). Thus, the relative positions of the first reference point C1 and the second reference point C2 are determined.

[0067] Among them, any point on the avoidance line 103b is taken as the flow point P. The distance between the flow point P and the first reference point C1 is r1, and the distance between the flow point P and the second reference point C2 is r2, (0.25d). 2 ≤r²×r²≤(0.36d) 2 This determines the shape of the avoidance line 103b, that is, r1×r2=k 2 k is a constant, and k satisfies 0.25d≤k≤0.36d.

[0068] It should be noted that, Figure 9 The middle section represents the complete curve of the Cassini oval curve. The equation of the Cassini oval curve is:

[0069] (x 2 +y 2 ) 2 -2b(x 2 -y 2 )=b 4 -c 4 (where b and c are constants).

[0070] In the first plane, the first axis M is taken as the x-axis, and the straight line passing through the first reference point C1 and the second reference point C2 is taken as the y-axis. The coordinates of the first reference point C1 are (0, 0.5d), and the coordinates of the second reference point C2 are (0, -0.5d), where d is a constant. The coordinates of the flowing point P are (x1, y1), because r1 × r2 = k.2 ,so The equation, after simplification, becomes:

[0071] (x 2 +y 2 ) 2 -0.5d(x 2 -y 2 )=k 4 -(0.5d) 4 ;

[0072] In summary, the equation of the avoidance line 103b satisfies the curve equation of the Cassini oval curve. Therefore, the shape of the avoidance line 103b satisfies the characteristics of the Cassini oval curve, that is, the avoidance line 103b is a part of the shape of the Cassini oval curve. This makes the flue gas flow more uniformly at the avoidance surface 1032 of the flue gas volute 100, which can reduce the velocity gradient and eddy intensity of the flue gas, reduce the turbulent kinetic energy at the avoidance surface 1032, improve the flow uniformity, and also reduce the aerodynamic noise of the flue gas volute 100.

[0073] It should also be noted that, taking the peripheral side plate of the range hood volute 100 as being perpendicular to the first end plate and the second end plate as an example, Figure 10 (a) is a comparison curve of the air volume at the air outlet 106 of the volute casing 100 in the related art and the air volume at the air outlet 106 of the volute casing 100 in this application. Figure 10 In (a), the horizontal axis represents time, and the vertical axis represents the air volume at the air outlet 106. The solid line in the figure represents the air volume at the air outlet 106 of the range hood volute 100 of this application at different times, and the dashed line in the figure represents the air volume at the air outlet 106 of the range hood volute 100 in the related art at different times. Figure 10 The curve in (a) shows that the air volume of the air outlet 106 of the volute 100 in this application is larger than that of the air outlet 106 of the volute 100 in the related art, indicating that the air volume of the volute 100 in this embodiment is larger and more conducive to the exhaust of flue gas.

[0074] Figure 10 Table (b) is a comparison table of the operating noise of the flue gas volute 100 in the related art and the flue gas volute 100 of this application. Figure 10 In the operating state described in (b), the range hood 2000 equipped with the volute 100 of this application has an operating noise of 61.2 dB(A), which is 2.3 dB(A) lower than the noise of the range hood 2000 equipped with the volute 100 in the related art. In the semi-silence high fan speed mode, the noise of the range hood 2000 equipped with the volute 100 of this application is 51.3 dB(A), which is 4.2 dB(A) lower than the noise of the range hood 2000 equipped with the volute 100 in the related art. This shows that the noise generated by the volute 100 in this embodiment is lower.

[0075] Please see Figure 5 or Figure 8 In some embodiments of this application, the volute 100 of the range hood also includes a guide ring 24, which is disposed at the air inlet 105 to guide the flue gas. The guide ring 24 is arranged in an arc shape facing away from the suction cavity 107, which facilitates the external flue gas to enter the air cavity 107 from the air inlet 105 along the arc-shaped protruding surface of the guide ring 24.

[0076] In some embodiments, such as Figure 5 or Figure 8 As shown, a second flow guiding structure 25 is provided on the side of the guide ring 24 facing the centerline of the air inlet 105. That is, the first end of the guide ring 24 is connected to the inlet wall of the air inlet 105, and the second end of the guide ring 24 extends away from the air inlet 105. The second flow guiding structure 25 is located at the second end of the guide ring 24 to guide the external flue gas. The second flow guiding structure 25 can be a sawtooth structure or a beveled structure. Taking the side of the guide ring 24 facing the centerline of the air inlet 105 as an example, the sawtooth structure can disrupt the flow pattern of the vortex, thereby weakening or even eliminating the vortex phenomenon, achieving the effects of noise reduction and increased air volume.

[0077] Or, such as Figure 5 or Figure 8 As shown, the guide ring 24 can be arranged in an arc shape facing away from the suction cavity 107. At the same time, the second end of the guide ring 24 is provided with a second guide structure 25 to further guide the external smoke, so that more external smoke can enter the air cavity 107 along the guide ring 24.

[0078] Thirdly, please see Figure 11 This application also provides a range hood 2000, including a main body 300 and a fan 1000 as described in the above embodiments. The main body 300 is provided with a flue 301 and an exhaust port 301 connected to the flue 301. The flue 301 is connected to an air inlet 105, and the exhaust port 106 is connected to the outside of the main body 300. The fan 1000 is located inside the main body 300. The fan 1000 draws the smoke from the exhaust port 301 into the flue 301 and the air inlet 105, and discharges the smoke from the exhaust port 106 into the range hood 2000.

[0079] Specifically, the range hood 2000 also includes a mounting bracket 11, which can be set between the end plate of the range hood volute 100 and the main body 300, and the fan 1000 is fixed to the main body 300 by the mounting bracket 11.

[0080] It should be noted that the range hood 2000 also includes a check valve 13 connected to the main body 300. The check valve 13 is located at the air outlet 106. The check valve 13 ensures that the smoke can only be discharged unidirectionally from the air chamber 107 of the range hood volute 100 to the air outlet 106, preventing the smoke from flowing back from the air outlet 106 to the air chamber 107 and the air inlet 105. The main body 300 includes a top plate 14 and a bottom plate, which are arranged opposite to each other. The exhaust port 301 is located on the bottom plate, and the air outlet 106 is located on the top plate 14. The check valve 13 is installed on the top plate 14. After the range hood 2000 is installed, the bottom plate and the exhaust port 301 are close to the gas stove, while the top plate 14 is far away from the gas stove. The air outlet 106 is connected to the outside of the kitchen through the check valve 13 and the smoke pipe, so that the range hood 2000 can draw the smoke generated by the gas stove to the outside of the kitchen.

[0081] In the accompanying drawings of this embodiment, the same or similar reference numerals correspond to the same or similar components. In the description of this application, it should be understood that if terms such as "upper," "lower," "left," and "right" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the components or elements referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting this application. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0082] The above are merely preferred embodiments of this application and are not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A wind turbine assembly, characterized in that, include: The first wind turbine includes a first frame and a plurality of first blades. The plurality of first blades are distributed circumferentially along the first frame to form an air intake space. Each first blade has a leading edge surface facing the air intake space and a trailing edge surface facing away from the air intake space. The leading edge surface is provided with a guide surface at at least one end, which is used to guide the flue gas in the intake space.

2. The wind turbine assembly according to claim 1, characterized in that, The guiding surface is a guiding slope.

3. The wind turbine assembly according to claim 1, characterized in that, According to claim 1, the wind turbine assembly is characterized in that the first blade has a first end face located between the leading edge surface and the trailing edge surface, and the first end face is connected to the first frame. The guiding surface is formed by a guiding ramp, which extends from the leading edge to the first end face, and the guiding ramp and the first end face are arranged at an angle; or... The guide surface is formed by connecting multiple guide slopes in sequence. The multiple guide slopes are connected between the leading edge surface and the first end surface in sequence, and at least two of the multiple guide slopes have different inclination angles relative to the first end surface.

4. The wind turbine assembly according to claim 1, characterized in that, The guide surface is provided at both ends of the leading edge surface.

5. The wind turbine assembly according to claim 4, characterized in that, The first blade has a first end face and a second end face that are disposed opposite to each other. At least one of the first end face and the second end face is connected to the first frame. The leading edge face, the first end face, the trailing edge face and the second end face are connected in sequence. The flow guiding surface located at the first end of the leading edge surface is a first flow guiding slope, which extends from the leading edge surface to the first end surface, and the first flow guiding slope and the first end surface are arranged at an angle. The guide surface located at the second end of the leading edge surface is a second guide slope, which extends from the leading edge surface to the second end surface, and the second guide slope and the second end surface are arranged at an angle.

6. The wind turbine assembly according to claim 5, characterized in that, The orthographic projections of the leading edge surface and the trailing edge surface onto the first reference plane have corresponding leading edge lines and trailing edge lines. The first reference plane is parallel to the second end face. The leading edge line has a first endpoint close to the air intake space, and the trailing edge line has a second endpoint away from the air intake space. The length of the line connecting the orthographic projections of the first endpoint and the second endpoint onto the first reference plane is W1. The second reference plane passes through the first endpoint and the second endpoint, and the second reference plane is perpendicular to the first reference plane. The orthographic projection length of the first guide slope onto the second reference plane is W2, where W2 satisfies 0.1W1≤W2≤0.5W1; and / or, The orthographic projection length of the second guide slope on the second reference plane is W3, and W3 satisfies 0.1W1≤W3≤0.5W1.

7. The wind turbine assembly according to claim 6, characterized in that, The first and second guiding slopes, when projected onto the second reference plane, have corresponding first and second guiding slopes. Wherein, the length of the first guide slope is R1, and the length of the second guide slope is R2, wherein R1≤R2.

8. The wind turbine assembly according to claim 1, characterized in that, The first blade is a backward-curved blade.

9. The wind turbine assembly according to claim 1, characterized in that, A first flow guiding structure is provided on at least one of the leading edge surface and the trailing edge surface, and the first flow guiding structure extends along the axial direction of the first impeller.

10. A fan, characterized in that, include: The wind turbine assembly as described in any one of claims 1-9; and, A range hood volute includes a housing, the housing having a wind cavity and an air inlet and an air outlet communicating with the wind cavity, and the impeller assembly being disposed within the wind cavity.

11. The fan according to claim 10, characterized in that, The housing includes: First end plate; The second end plate is disposed at a distance from the first end plate; A peripheral side plate is located between the first end plate and the second end plate. The first end plate, the peripheral side plate, and the second end plate together form the air cavity and the air outlet. The air inlet is provided on the first end plate and / or the second end plate. The outer contour of the peripheral side plate projected onto the first plane includes a first arc, a clearance line, and a second arc arranged sequentially and connected along the periphery of the peripheral side plate. The first plane is perpendicular to the axis of the air inlet. The radius of curvature at each point on the second arc is greater than the radius of curvature at each point on the first arc, and the radius of curvature at each point on the clearance line is greater than the radius of curvature at each point on the second arc.

12. The fan according to claim 11, characterized in that, The peripheral side plate is connected to and perpendicular to the first end plate and the second end plate; or... Both ends of the peripheral side plate are provided with arc-shaped transition portions. The first end of the peripheral side plate is connected to the first end plate through one of the arc-shaped transition portions, and the second end of the peripheral side plate is connected to the second end plate through another arc-shaped transition portion.

13. The fan according to claim 10, characterized in that, The maximum length of the first end plate and the second end plate along the first direction is H, and the maximum length of the first end plate and the second end plate along the second direction is W, where H < 600 mm and W < 600 mm. Wherein, the first direction is parallel to the axial direction of the air outlet, the second direction is perpendicular to the first direction, and the second direction is parallel to the first plane.

14. The fan according to claim 13, characterized in that, The orthographic projection of the centerline of the air inlet onto the first plane is point O. The first plane has a first axis, a first reference point, and a second reference point. The first axis is parallel to the second direction and intersects with point O. The first reference point and the second reference point are symmetrically distributed about the first axis, and the distance between the first reference point and the second reference point is d, where 0.25H≤d≤0.5H. The first axis and the avoidance line have a first intersection point. In the second direction, the shortest distance from the first intersection point to the straight line passing through the first reference point and the second reference point is a, where 0.2W≤a≤0.5W. The distance between the flow point on the avoidance line and the first reference point is r1, and the distance between the flow point and the second reference point is r2, (0.25d). 2 ≤r²×r²≤(0.36d) 2 .

15. The fan according to claim 10, characterized in that, A guide ring is provided at the air inlet; The guide ring is provided with an arc-shaped protrusion facing away from the air intake cavity, and / or, the guide ring is provided with a second guide structure on the side facing the center line of the air inlet.

16. A range hood, characterized in that, include: The fan as described in any one of claims 10-15; and, The main body is provided with a flue and an exhaust port connected to the flue. The flue is connected to the air inlet of the housing. The fan is located inside the main body. The fan draws the flue gas from the exhaust port into the flue and the air inlet, and discharges the flue gas from the exhaust port into the range hood.

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