Wind wheel assembly, fan and range hood

Abstract

The invention discloses a wind wheel assembly, a fan and a range hood, and relates to the technical field of fan impeller structures, when the range hood sucks smoke, a second wind wheel sucks the smoke into an air inlet space and forms airflow, the airflow flows to a fixed third blade after being pressurized and accelerated by a second blade, and the third blade diffuses and rectifies the airflow, so that the airflow is compressed and rectified; the kinetic energy of the airflow is converted into pressure energy, the exhaust pressure of the airflow is improved, the first wind wheel continues to suck the airflow, the first wind wheel further increases the exhaust pressure of the airflow, and the flow guide faces on the first blades can reduce or eliminate vortex areas generated due to the fact that the airflow impacts the first blades. Therefore, the flow state in the wind wheel assembly can be improved, the uniformity of airflow distribution is improved, and the exhaust pressure of airflow can be further increased. Therefore, through the first wind wheel, the second wind wheel and the diffusion wind wheel, the static pressure of the smoke exhausted by the range hood can be increased, the air volume of the exhausted smoke is increased, and the smoke suction effect of the range hood is enhanced.

Description

Technical Field

[0001] This application relates to the technical field of fan impeller structure, and more particularly to a fan impeller assembly, a fan, and a range hood. Background Technology

[0002] With the increasing prevalence of high-rise residential buildings, the resistance within shared ventilation ducts has significantly impacted the smoke extraction efficiency of range hoods. Within the same high-rise building, the lower the floor where the range hood is located, the greater the resistance in the shared ventilation duct. Because the external resistance that range hoods on lower floors need to overcome to expel smoke is greater than that on higher floors, the operating airflow of range hoods on lower floors is lower, sometimes even lower than the airflow required to effectively extract smoke, resulting in unsatisfactory smoke extraction.

[0003] In related technologies, to increase the airflow of range hoods, methods include increasing the inner and outer diameters of a single-sided air intake impeller, using a fan system with double-sided air intake impellers, or employing a dual-fan range hood with dual air inlets directly aimed at the stovetop. However, the static pressure of the exhaust gas from the range hood does not increase significantly, and it remains difficult to overcome the resistance within the common flue, resulting in unsatisfactory smoke extraction. Summary of the Invention

[0004] This application provides a wind turbine assembly, a fan, and a range hood, which can solve the technical problem that the high resistance in the public flue of high-rise residential buildings leads to unsatisfactory smoke extraction effect of the range hood.

[0005] In a first aspect, embodiments of this application provide a wind turbine assembly, which includes:

[0006] The first wind turbine includes multiple first blades and a first frame, wherein the multiple first blades are circumferentially spaced along the first frame to form an air intake space; and

[0007] The second impeller is located within the air intake space and is spaced apart from the first impeller. The axis of the first impeller is parallel to the axis of the second impeller. The second impeller includes a plurality of second blades and a second frame. The second frame is mounted on the first frame, and the plurality of second blades are distributed circumferentially along the first frame.

[0008] A diffuser wind turbine includes a plurality of third blades and a third frame disposed between the first blade and the second blade. The plurality of third blades are arranged sequentially at intervals around the axis of the diffuser wind turbine on the third frame. The axis of the diffuser wind turbine is parallel to the axis of the second wind turbine.

[0009] Each of the first blades has a leading edge surface facing the air intake space and a trailing edge surface facing away from the air intake space. At least one end of the leading edge surface is provided with a guide surface, which is recessed towards the trailing edge surface.

[0010] In some embodiments, the diffuser includes a guide ring, which is fixedly disposed on the side of the first wind turbine along the axis of the first wind turbine, and a plurality of the third blades are connected to the guide ring.

[0011] In some embodiments, the guide ring is provided with an arc-shaped protrusion facing away from the first impeller, and / or, the guide ring is provided with a second guide structure on the side facing the axis of the first impeller.

[0012] In some embodiments, the vertical distance between the second blade and the guide ring is L, where L satisfies: 5mm ≤ L ≤ 15mm.

[0013] In some embodiments, the rotation direction of the first blade is opposite to that of the second blade.

[0014] In some embodiments, the direction of rotation of the third blade is opposite to that of the first blade.

[0015] In some embodiments, the axis of the first wind turbine, the axis of the second wind turbine, and the axis of the diffuser wind turbine all coincide.

[0016] In some embodiments, the number of the first blades is N1, where N1 satisfies: 40≤N1≤70, and the number of the second blades is N2, where N2 satisfies: 10≤N2≤60.

[0017] Where N1 and N2 satisfy: 1.5≤N1 / N2≤4;

[0018] And / or, N1 and N2 are coprime numbers.

[0019] In some embodiments, the number of the third blades is N3, where N3 satisfies: 10 ≤ N3 ≤ 60, and N2 and N3 satisfy: N2 = N3.

[0020] In some embodiments, the guide surfaces are provided at both ends of the leading edge surface;

[0021] And / or, the guiding surface is a guiding slope.

[0022] In some embodiments, the guide slope at one end of the leading edge is a first guide slope, and the guide slope at the other end of the leading edge is a second guide slope. The first guide slope extends from the leading edge to a first end face of the first blade, and the second guide slope extends from the leading edge to a second end face of the first blade.

[0023] In some embodiments, the orthographic projections of the leading edge surface and the trailing edge surface onto a plane passing through the second end face have corresponding leading edge lines and trailing edge lines. The line connecting the end of the leading edge line facing the air intake space and the end of the trailing edge line facing the air intake space is parallel to a reference plane. The reference plane is perpendicular to the second end face. The distance between the projections of the end of the leading edge line facing away from the air intake space and the end of the trailing edge line facing away from the air intake space onto the reference plane along the extension direction of the connecting line is W1.

[0024] The distance between the projections of the two ends of the first guide slope on the vertical plane along the extension direction of the connecting line is W2, and W2 satisfies 0.1W1≤W2≤0.5W1;

[0025] And / or, the distance between the projections of the two ends of the second guide slope on the vertical plane along the extension direction of the connecting line is W3, wherein W3 satisfies 0.1W1≤W3≤0.5W1;

[0026] And / or, the first blade has a first guide line corresponding to the first guide slope in the vertical projection, the length of the first guide line being R1, and the first blade has a second guide line corresponding to the second guide slope in the vertical projection, the length of the second guide slope being R2, wherein R2≤R1.

[0027] In some embodiments, at least one of the trailing edge surface and the leading edge surface of the first blade is provided with a first flow guiding structure, the first flow guiding structure extending along the axial direction of the first impeller.

[0028] Secondly, embodiments of this application provide a fan, which includes:

[0029] The wind turbine assembly described in any of the above items; and

[0030] A range hood volute, the range hood volute comprising a housing, the housing forming a wind cavity and an air inlet and an air outlet communicating with the wind cavity;

[0031] The wind turbine assembly is located inside the wind cavity.

[0032] In some embodiments, the housing includes:

[0033] First end plate;

[0034] The second end plate is disposed at a distance from the first end plate;

[0035] A peripheral side plate is located between the first end plate and the second end plate, and an air inlet communicating with the air cavity is provided on the first end plate and / or the second end plate;

[0036] 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, and the radius of curvature at each point on the clearance line is greater than the radius of curvature at each point on the first arc and the second arc.

[0037] In some embodiments, 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.

[0038] 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.

[0039] In some embodiments, 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.

[0040] 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.

[0041] 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 ≤r1*r2≤(0.36d) 2 .

[0042] In some embodiments, the housing further includes an arc-shaped transition portion, one end of the peripheral side plate is connected to the first end plate through the arc-shaped transition portion, and the other end of the peripheral side plate is connected to the second end plate through the arc-shaped transition portion;

[0043] Alternatively, the peripheral side plate is connected to and perpendicular to the first end plate and the second end plate.

[0044] Thirdly, embodiments of this application provide a range hood, which includes:

[0045] The main body has an air extraction port, and the main body contains a flue connected to the air extraction port; and

[0046] The fan described in any of the above embodiments is located inside the main body, and the fan draws flue gas from the exhaust port into the flue.

[0047] The impeller assembly, fan, and range hood based on the embodiments of this application have at least the following beneficial effects:

[0048] When the range hood extracts gas, the first and second impellers rotate simultaneously. The rotating second impeller draws air into the intake space, forming an airflow. After being pressurized and accelerated by the second blade, the airflow flows towards the fixed third blade. The third blade diffuses and rectifies the airflow, converting its kinetic energy into pressure energy and increasing the exhaust pressure. The rotating first impeller continues to draw in air, further increasing the exhaust pressure. Since each first blade has a leading edge facing the intake space and a trailing edge facing away from the intake space, at least one end of the leading edge is provided with a guide surface to facilitate airflow into the intake space. The guide surface is concave towards the trailing edge. The guide surface reduces or eliminates the vortex area generated by the airflow directly impacting the first blade at the air inlet. This helps improve the flow state inside the impeller assembly and enhances the uniformity of airflow distribution. Therefore, through the dual-stage pressurization of the first and second impellers, the diffusion and rectification effect of the diffuser impeller, and the reduction or elimination of the vortex area generated by the airflow impacting the first blades by the guide surface, the exhaust pressure of the range hood can be increased, that is, the static pressure of the exhaust gas from the range hood can be increased, so that the range hood on the lower floor can overcome the resistance of the common flue, thereby increasing the air volume of exhaust gas and enhancing the smoke extraction effect of the range hood. Attached Figure Description

[0049] 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.

[0050] Figure 1 This is a schematic diagram of the structure of a range hood in one embodiment of this application;

[0051] Figure 2 This is a schematic diagram of the structure of a fan in one embodiment of this application;

[0052] Figure 3 This is an exploded structural diagram of a wind turbine assembly in one embodiment of this application;

[0053] Figure 4 This is a schematic diagram of the wind turbine assembly in one embodiment of this application;

[0054] Figure 5This 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 reference plane;

[0055] Figure 6 This is a comparison curve of the exhaust gas static pressure of the wind turbine assembly of this application and wind turbine assemblies of related technologies;

[0056] Figure 7 This is a schematic diagram of the diffuser impeller in one embodiment of this application;

[0057] Figure 8 This is a top view of a wind turbine assembly in one embodiment of this application;

[0058] Figure 9 This is a cross-sectional structural diagram of a wind turbine assembly in one embodiment of this application;

[0059] Figure 10 This is a schematic diagram of the structure of the first and second wind turbines in one embodiment of this application;

[0060] Figure 11 This is a first-view structural diagram of the volute casing of a smoke machine in one embodiment of this application;

[0061] Figure 12 This is a second-view structural diagram of the flue casing in one embodiment of this application;

[0062] Figure 13 This is a schematic cross-sectional view of the volute casing of a smoke machine in one embodiment of this application;

[0063] Figure 14 This is a third-view structural diagram of the volute casing of a smoke machine in one embodiment of this application;

[0064] Figure 15 This is a schematic projection of the flue casing of the smoke machine onto a first plane in one embodiment of this application;

[0065] Figure 16 For Cassini's oval line;

[0066] Figure 17 This document presents a comparison curve of the airflow at the outlet of the flue housing in this application and a comparison table of noise test results between the flue housings of flue housings in related technologies and those in this application.

[0067] Explanation of reference numerals in the attached figures:

[0068] 100. Range hood volute; 10. Housing;

[0069] 101. First end plate;

[0070] 102. Second end plate;

[0071] 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;

[0072] 105. Air inlet;

[0073] 106. Air vent;

[0074] 107. Wind cavity;

[0075] 1000, Wind turbine; 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; 203, First guide structure; 21, Second wind turbine; 211, Second frame; 212, Second blade; 22, Diffuser wind turbine; 221, Third frame; 222, Third blade; 23, Rotation shaft; 24, Guide ring; 25, Second guide structure;

[0076] 2000, Range hood; 300, Main body; 301, Air extraction port; 11, Mounting bracket; 12, Limiting bracket; 13, Check valve; 14, Top plate;

[0077] XX, first direction; YY, second direction; M, first axis. Detailed Implementation

[0078] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0079] As people's living standards improve, the demand for protection from cooking fumes is also increasing, making range hoods an indispensable household appliance for purifying the kitchen environment. A range hood draws the mixture of cooking fumes and water vapor into a fan and then uses the air pressure generated by the fan to expel the mixture.

[0080] The two most important performance indicators for range hoods are air volume and static pressure. Range hoods with high air volume have good smoke extraction effects and can quickly draw in cooking fumes; range hoods with high static pressure can overcome high pipe network resistance, allowing them to maintain a large air volume even under high back pressure.

[0081] In actual home use scenarios, external resistance is related to various factors in the range hood's operating environment, including the length of the flue, the number of bends in the flue, and the initial static pressure generated by other users venting smoke into the shared flue. Furthermore, because users are on different floors, the operating rate of the range hood varies within the same building, resulting in different initial static pressures in the shared flue. Generally, within a high-rise building, the lower the user's floor, the higher the operating rate, and the greater the resistance in the shared flue. When external resistance differs, the operating airflow also differs. Because the external resistance is greater for users on lower floors than for users on higher floors, the operating airflow is lower for lower floors and higher for higher floors. This has the following adverse effects: for users on lower floors, the operating airflow of the range hood is lower, far below the airflow required to effectively remove cooking fumes, resulting in unsatisfactory smoke extraction.

[0082] In related technologies, to increase the air volume of a range hood, the inner and outer diameters of a single-sided air intake impeller can be increased, which leads to an increase in impeller weight and motor power; or a fan system with a double-sided air intake impeller can be used, which can make full use of the area on the motor side of the fan system to improve the airflow inside the range hood and increase the air volume; or a dual-fan range hood can be used, whose dual air intakes can be directly aimed at the stove, hoping to achieve the goal of large air volume and good smoke extraction effect.

[0083] Although the above measures increased the air intake volume, the static pressure did not improve significantly, and it was still difficult to solve the problem of high pipe network resistance and difficulty in smoke exhaust in high-rise building range hoods.

[0084] To resolve the above issues, please refer to [link / reference]. Figure 1 This application provides a range hood 2000, including a main body 300 and a fan 1000. The main body 300 serves as an external protective component for the range hood 2000, supporting and fixing the fan 1000 and other components. The main body 300 can be made of metal, including but not limited to stainless steel and aluminum, etc. This application does not limit this. When the main body 300 is made of stainless steel, it has advantages such as high strength, high temperature resistance, and environmental friendliness.

[0085] 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 range hood volute 100 is fixed to the main body 300 by the mounting bracket 11.

[0086] In some embodiments of this application, such as Figure 1 and Figure 2 As shown, 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 allows the smoke to 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.

[0087] Specifically, the main body 300 includes a top plate 14 and a bottom plate, with the top plate 14 and bottom plate positioned opposite each other. An exhaust port 301 is located on the bottom plate, and an exhaust port 106 is located on the top plate 14. A check valve 13 is installed on the top plate 14. After the range hood 2000 is installed, the bottom plate and exhaust port 301 are close to the gas stove, while the top plate 14 is away from the gas stove. The exhaust port 106 is connected to the outside of the kitchen via the check valve 13 and a flue pipe, allowing the range hood 2000 to draw the fumes generated by the gas stove outside the kitchen. The working principle of the range hood 2000 has been disclosed in relevant technologies and will not be elaborated here.

[0088] The fan 1000 generates negative pressure suction to draw fumes from below or to the side of the range hood 2000 into the main body 300 through the exhaust port 301. The main body 300 has a flue connected to the exhaust port 301. When fumes enter the main body 300, they are drawn into the flue by the negative pressure suction of the fan 1000 and discharged outdoors or into the exhaust pipe.

[0089] The fan 1000 can be an axial flow fan, a cross flow fan, or a centrifugal fan. In this embodiment, the fan 1000 is a centrifugal fan, specifically a multi-blade centrifugal fan, for illustrative purposes.

[0090] Specifically, please refer to Figure 2 The fan 1000 includes a rotor assembly 200 and a flue volute 100. The flue volute 100 includes a housing 10, which forms a wind chamber 107 and an air inlet 105 and an air outlet 106 communicating with the wind chamber 107. The rotor assembly 200 is located inside the wind chamber 107. The housing 10 serves as the exterior component of the entire fan 1000, protecting the rotor assembly 200 and reducing the probability of foreign objects coming into contact with it. In addition, the housing 10 can guide the airflow, allowing the flue gas entering the main body 300 to enter the wind chamber 107 through the air inlet 105. After the operation of the rotor assembly 200, the flue gas is discharged through the air outlet 106. The air outlet 106 is connected to the flue, so the flue gas is finally discharged outdoors or into the exhaust pipe through the flue.

[0091] In the embodiments of this application, please refer to Figure 3 and Figure 4 The wind turbine assembly 200 may include a first wind turbine 20, a second wind turbine 21 and a diffuser wind turbine 22. The second wind turbine 21 may be disposed inside the first wind turbine 20, and the diffuser wind turbine 22 may be partially disposed between the first wind turbine 20 and the second wind turbine 21.

[0092] Combination Figure 3 and Figure 4Specifically, the first impeller 20 may include a plurality of first blades 202 and a first frame 201. The plurality of first blades 202 may be disposed on the first frame 201 and distributed at intervals along the circumference of the first frame 201, so that the plurality of first blades 202 may form an air intake space 2011.

[0093] The second impeller 21 can be disposed inside the air intake space 2011, and the second impeller 21 is spaced apart from the first impeller 20. The axis of the first impeller 20 can be parallel to the axis of the second impeller 21. The second impeller 21 includes a plurality of second blades 212 and a second frame 211. The plurality of second blades 212 are disposed on the second frame 211, and the plurality of second blades 212 can be distributed circumferentially along the first frame 201. The second frame 211 can be installed on the first frame 201, so that the first impeller 20 and the second impeller 21 can rotate synchronously.

[0094] The diffuser 22 can include multiple third blades 222 and a third frame 221. The multiple third blades 222 can be distributed sequentially and at intervals around the axis of the diffuser 22 on the third frame 221. The axis of the diffuser 22 can be parallel to the axis of the second impeller 21, and the third blades 222 can be fixedly disposed between the first blade 202 and the second blade 212.

[0095] Optionally, the first frame 201 can be polygonal, circular, or the like. Multiple first blades 202 are distributed circumferentially along the first frame 201, and the multiple first blades 202 can be arranged in a circumferential direction to form an air intake space 2011. The shape of the second frame 211 can be similar to that of the first frame 201, and the size of the second frame 211 is smaller than that of the first frame 201, so that the second frame 211 can be set in the air intake space 2011. The second frame 211 can be fixed to the first frame 201 by welding or threaded connection. The second blades 212 are set on the second frame 211 and are spaced apart from the first blades 202. Along the axial direction of the second impeller 21, multiple second blades 212 can form an air inlet 105 on the side of the second impeller 21 facing away from the first frame 201.

[0096] When the range hood 2000 is drawing in exhaust gas, the first impeller 20 and the second impeller 21 rotate simultaneously. The rotating second impeller 21 draws air from the air inlet 105 into the air intake space 2011 and forms an airflow. After the airflow is pressurized and accelerated by the second blade 212, it flows towards the fixed diffuser impeller 22. The third blade 222 of the diffuser impeller 22 can diffuse and rectify the airflow. More specifically, the third blade 222 can reduce the formation of eddies and backflows in the airflow, making the airflow flow more evenly and stably. Thus, under the diffusion and rectification effect of the diffuser impeller 22, the kinetic energy of the airflow can be converted into pressure energy, increasing the exhaust pressure of the airflow. The rotating first impeller 20 continues to draw in airflow, and after being pressurized and accelerated by the first blade 202, the exhaust pressure of the airflow can be further increased.

[0097] Therefore, through the dual-stage pressurization of the first impeller 20 and the second impeller 21, as well as the diffusion and rectification effect of the diffuser impeller 22, the exhaust pressure of the range hood 2000 can be increased, that is, the static pressure of the exhaust gas of the range hood 2000 can be increased, so that the range hood 2000 on the lower floor can overcome the resistance of the common flue, thereby increasing the air volume of exhaust gas and enhancing the smoke extraction effect of the range hood 2000.

[0098] In this application embodiment, when the fan 1000 is described as a centrifugal fan, the air intake direction of the centrifugal fan is axial air intake. Specifically, in this application, the airflow enters the air intake space 2011 through the axial direction of the first impeller 20, that is, the air inlet 105 on the housing 10 is located on one side of the first blade 202 along the axial direction of the first impeller 20.

[0099] Since 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, in order to facilitate airflow into the intake space 2011, please refer to... Figure 5 (I) At least one end of the leading edge surface 2021 is provided with a guide surface 202a, the guide surface 202a is recessed towards the trailing edge surface 2022, and it can be understood that the guide surface 202a is disposed opposite to the air inlet 105.

[0100] Thus, the concave design of the inlet 105 blades effectively alters the airflow path when entering the fan 1000, reducing or eliminating the vortex region generated by the direct impact of airflow on the first blade 202 at the inlet 105. This helps improve the flow state inside the fan 1000 and enhances the uniformity of airflow distribution. By reducing the vortex region, the fan 1000 can utilize airflow energy more effectively during operation, reducing energy loss caused by vortices, thus improving the overall efficiency of the fan 1000 and reducing energy consumption. Furthermore, the vortex region also reduces the startup noise of the entire impeller assembly 200.

[0101] It should also be noted that, Figure 6 A comparison curve showing the static pressure of the flue gas discharged from the wind turbine assembly 200 in the related art and the static pressure of the flue gas discharged from the wind turbine assembly 200 of this application. Figure 6 In the figure, the horizontal axis represents time, and the vertical axis represents the static pressure of the exhaust gas. The darker curves in the figure represent the static pressure values ​​of the exhaust gas from the impeller assembly 200 of this application at different times, while the lighter curves represent the static pressure values ​​of the exhaust gas from the impeller assembly 200 in related technologies at different times. Figure 6 The curve shows that the static pressure of the flue gas discharged by the impeller assembly 200 in this application is greater than that of the impeller assembly 200 in the related art, indicating that the impeller assembly 200 in this embodiment can generate a larger exhaust static pressure, which is more conducive to the discharge of flue gas.

[0102] Please see Figure 7 In some embodiments, the diffuser 22 may include a guide ring 24 along the axial direction of the first impeller 20. The guide ring 24 may be fixedly disposed on the side of the first impeller 20, and a plurality of third blades 222 are connected to the guide ring 24.

[0103] Optionally, the guide ring 24 can be an annular guide element. The guide ring 24 can be disposed on the axial side of the first impeller 20, and the guide ring 24 is located on the side of the second impeller 21 facing away from the first frame 201, so that the guide ring 24 and the air inlet 105 are located on the same side of the multiple second blades 212. The guide ring 24 can guide the air into the air intake space 2011, which can reduce the resistance of the second impeller 21 in drawing air. The guide ring 24 and the third frame 221 are respectively located at the opposite ends of the third blade 222, and the opposite ends of the third blade 222 are respectively connected to the guide ring 24 and the third frame 221.

[0104] Preferably, the centerline of the guide ring 24 can be aligned with the centerline of the air inlet 105, so that the projection of the guide ring 24 on its own axis can coincide with the air inlet 105, thereby providing the guiding effect of the guide ring 24.

[0105] Please see Figure 3 and Figure 7 In some embodiments, the guide ring 24 is provided with an arc-shaped protrusion in the direction away from the first impeller 20, and / or the guide ring 24 is provided with an arc-shaped protrusion on the side where the axis of the first impeller 20 is located.

[0106] Optionally, the guide ring 24 can protrude in a direction away from the first impeller 20, and the protruding part can form an arc-shaped guide convex surface. When the second impeller 21 draws air into the air intake space 2011, the arc-shaped guide convex surface can guide the air into the air intake space 2011, and the guide convex surface can prevent the air from generating vortices at the air inlet 105, reducing the noise generated during ventilation.

[0107] Optionally, the guide ring 24 can protrude towards the side where the axis of the first impeller 20 is located, and the protruding part can form an arc-shaped transition surface. Under the guidance of the transition surface, the airflow flowing into the intake space 2011 can flow into the intake space 2011 more smoothly, reducing the resistance of air flowing into the intake space 2011.

[0108] Preferably, the guide ring 24 can be provided with both a guide convex surface and a transition surface, and the guide convex surface and the transition surface are connected, so that the guide ring 24 can reduce the noise generated during ventilation and reduce the resistance of air flowing into the intake space 2011.

[0109] Please see Figure 8 In some embodiments, the vertical distance between the second blade 212 and the guide ring 24 is L, where L satisfies: 5mm≤L≤15mm.

[0110] Optionally, a gap exists between the second blade 212 and the guide ring 24 along a direction perpendicular to the axis of the second impeller 21. This gap prevents the second impeller 21 from interfering with the guide ring 24 during rotation. More specifically, the vertical distance between the second blade 212 and the guide ring 24 is L, where L satisfies: 5mm ≤ L ≤ 15mm. Within this range, while preventing interference between the second impeller 21 and the guide ring 24, it also reduces the vortex flow of air into the intake space 2011.

[0111] Combination Figure 9 As shown, the first blade 202 and the second blade 212 can have the same or opposite rotation direction. When the rotation direction is the same, the first blade 202 and the second blade 212 can both be forward-curved (also known as forward-tilted) blades and backward-curved (also known as backward-tilted) blades. When the rotation direction is opposite, the first blade 202 can be a forward-curved blade and the second blade 212 can be a backward-curved blade, or the first blade 202 can be a backward-curved blade and the second blade 212 can be a forward-curved blade.

[0112] In this embodiment, the rotation direction of the first blade 202 is opposite to that of the second blade 212, and further, the first blade 202 is a backward-curved blade and the second blade 212 is a forward-curved blade.

[0113] When the first blade 202 is a backward-curved blade and the second blade 212 is a forward-curved blade, the periodic overlap of the first blade 202 and the second blade 212 during the rotation of the wind turbine assembly 200 can be reduced. When the second blade 212 is a forward-curved blade, the leading edge of the blade is more curved than the trailing edge. Therefore, when the airflow passes through the second blade 212, the airflow will be thrust forward due to the curved shape of the blade, resulting in a more uniform airflow passing over the surface of the first blade 202. This not only ensures the aerodynamic performance of the first blade 202 but also reduces the rotational noise of the first blade 202 to a certain extent.

[0114] In this embodiment, the rotation direction of the third blade 222 can be opposite to that of the first blade 202. Furthermore, the first blade 202 is a backward-curved blade, and the third blade 222 is a forward-curved blade. When the first blade 202 is a backward-curved blade and the third blade 222 is a forward-curved blade, the principle is the same as when the first blade 202 is a backward-curved blade and the second blade 212 is a forward-curved blade, and will not be repeated here.

[0115] In some other embodiments of this application, the rotation direction of the first blade 202 is the same as that of the second blade 212. Furthermore, both the first blade 202 and the second blade 212 are forward-curved blades. In this case, the first blade 202 and the second blade 212 can eject airflow in the same direction. After the airflow is pressurized and accelerated by the second blade 212 in sequence, it can be pressurized and accelerated again by the first blade 202 in the same direction. The static pressure of the airflow can be further increased through the forward two-stage pressurization and acceleration.

[0116] Combination Figure 10 As shown, it can be understood that the first impeller 20 and the second impeller 21 can be driven to rotate by one motor, that is, the first impeller 20 and the second impeller 21 share the same rotating shaft 23, or they can be driven by two motors respectively. When the first impeller 20 is driven to rotate by one motor and the second impeller 21 is driven to rotate by another motor, the speed and direction of each impeller can be controlled independently, which increases the flexibility and adaptability of the equipment. When one motor fails, the other motor can still continue to work, which improves the reliability and fault tolerance of the equipment.

[0117] In this embodiment, the first impeller 20 and the second impeller 21 are controlled by a single motor. Using one motor to drive both the first impeller 20 and the second impeller 21 reduces the number of motors, simplifies the overall structure of the equipment, and lowers manufacturing costs. Under motor drive, the first impeller 20 and the second impeller 21 can rotate synchronously, which helps maintain the stability and uniformity of airflow.

[0118] When the first impeller 20 and the second impeller 21 are driven to rotate by a motor, the motor is mounted on the volute 100 of the smoke machine (not shown in the figure), and the output shaft of the motor is driven to connect to the first frame 201. The second frame 211 is mounted on the first frame 201. In this way, the operation of the motor can drive the first impeller 20 and the second impeller 21 to rotate synchronously.

[0119] Furthermore, in this embodiment, the number of first blades 202 is n1, and the number of second blades 212 is n2. n1 satisfies: 40 ≤ n1 ≤ 70, and n2 satisfies: 10 ≤ n2 ≤ 60, and n2 < n1. That is, n1 can be a range of 40, 50, 60, 70, or any two of these, and n2 can be a range of 10, 20, 30, 40, 50, 60, or any two of these. It is understood that when n1 is 40, then 10 ≤ n2 < 40; when n2 is 60, then 60 < n1 ≤ 70. This ensures that the airflow ejected from each second blade 212 can be quickly accelerated again by the first blade 202, thereby ensuring that the airflow ejected from the first blade 202 has sufficient pressure.

[0120] Generally speaking, when n1 is twice n2, the probability of airflow ejected from multiple second blades 212 colliding with the same first blade 202 can be reduced, thereby reducing eddies and backflow phenomena. This reduces noise while ensuring that the airflow ejected from the first blade 202 has sufficient pressure.

[0121] In this embodiment, n1 and n2 are coprime numbers. When the number of the first blades 202 and the number of the second blades 212 are coprime numbers, resonance is less likely to occur between them. This makes it difficult for the vibration frequencies generated by the first and second impellers during rotation to coincide, thereby reducing the possibility of resonance and thus lowering the overall vibration level of the wind turbine assembly 200, improving the stability and reliability of the system. A stable operating environment can reduce mechanical wear and failures caused by vibration, extending the service life of the equipment. In addition, the reduced overall vibration level of the wind turbine assembly 200 can also effectively reduce noise caused by vibration.

[0122] In this embodiment, the number of third blades 222 is n3, where n3 satisfies: 10 ≤ n3 ≤ 60, and n2 and n3 satisfy: n2 = n3. When n2 and n3 are equal, multiple second blades 212 can be configured one-to-one with multiple third blades 222, so that multiple third blades 222 can respectively diffuse and rectify the airflow thrown out by multiple second blades 212. The airflow thrown out by multiple second blades 212 will flow more uniformly and stably, which can further increase the exhaust pressure of the airflow.

[0123] Combination Figure 4As shown, it can be understood that the axis lines of the first impeller 20, the second impeller 21, and the diffuser 22 can all be parallel, meaning that the axis lines of the first impeller 20, the second impeller 21, and the diffuser 22 can coincide, or they can not coincide. In this embodiment, it is preferable that the axis lines of the first impeller 20, the second impeller 21, and the diffuser 22 coincide. This coincident axis line design may make the airflow interaction between the first impeller 20 and the diffuser 22, as well as between the second impeller 21 and the diffuser 22, more favorable, reducing airflow turbulence and eddy formation. This not only reduces noise but also reduces airflow energy loss, ensuring that the discharged flue gas has sufficient static pressure.

[0124] In addition, the coincidence of the axis lines allows the first wind turbine 20 and the second wind turbine 21 to be connected to the generator through the same transmission system, reducing energy loss in the intermediate transmission links.

[0125] Centrifugal fans can employ single-sided or double-sided air intake. To improve air volume and efficiency, this embodiment uses double air intake, meaning two air inlets 105 are symmetrically distributed on both sides of the housing 10 along the axial direction of the first impeller 20. Please refer to [link to relevant documentation]. Figure 11 That is, the two air inlets 105 are respectively located on both sides of the housing 10 along the axial direction of the first impeller 20, and are opposite to the air intake space 2011.

[0126] Combination Figure 5 As shown in (Ⅰ), since the centrifugal fan adopts a double-sided air intake method, both ends of the leading edge surface 2021 of the first blade 202 have guide surfaces 202a. These guide surfaces 202a at both ends of the leading edge surface 2021 of the first blade 202 can be either guide arc surfaces or guide slope surfaces 202a1. Alternatively, one end of the guide surface 202a can be a guide arc surface, and the other end can be a guide slope surface 202a1. The shape of the guide surfaces 202a is not specifically limited, but it can ensure that the airflow drawn in through the air inlet 105 changes its flow path when passing through the guide surfaces 202a, reducing or eliminating the vortex region generated by the airflow directly impacting the first blade 202 at the air inlet 105. In this embodiment, the example is provided where both ends of the guide surfaces 202a of the leading edge surface 2021 of the first blade 202 are guide slope surfaces 202a1.

[0127] One end of the guide slope 202a1 is the first guide slope, and the other end of the guide slope 202a1 is the second guide slope. The first guide slope extends from the leading edge surface 2021 to the first end surface 2023 of the first blade 202, and the second guide slope extends from the leading edge surface 2021 to the second end surface 2024 of the first blade 202. In this embodiment, the first end surface 2023 and the second end surface 2024 are end surfaces distributed at both ends of the first blade 202 along the length direction of the first blade 202. The first end surface 2023 faces one air inlet 105 of the housing 10, and the second end surface 2024 faces the other air inlet 105 of the housing 10.

[0128] In this way, the airflow that originally entered through the inlet 105 and might have collided with the first blade 202 can now directly enter the intake space 2011 through the first and second guide slopes. That is, the first and second guide slopes can more precisely control the flow path of the airflow when entering the blade. This streamlined design helps to reduce airflow separation and vortex generation at the leading edge of the blade, thereby improving the stability and uniformity of the airflow.

[0129] It is understood that the first and second guide slopes can be a single slope or a combination of multiple slopes, depending on the convenience of actual processing. No specific restrictions are imposed in this embodiment.

[0130] In this embodiment, the first impeller and the second impeller are driven to rotate by a motor. In order to reduce the size of the motor-driven part occupying the air intake space 2011, i.e., to not affect the air intake of the impeller assembly 200, the motor is generally located on one side of the entire housing 10 along the axis of the first impeller 20. Thus, the arrangement of the motor and the first frame 201 will affect the air intake of the adjacent air inlet 105, resulting in a smaller air intake.

[0131] The first frame 201 generally includes an upper plate, a lower plate, and a middle plate. The upper plate is located on one end face of multiple first blades 202, the lower plate is located on the other end face of multiple first blades 202, and the middle plate is located between the upper and lower plates. The upper plate, lower plate, and middle plate are all used to connect the multiple first blades 202 together. The lower plate is generally located near the motor, and in order to ensure that the intake space 2011 has a large volume, the middle plate is also designed to be near the lower plate, such as... Figure 3As shown, since the middle plate is close to the lower plate, it may affect the design of the guide slope 202a1 of the first blade 202 near the lower plate. In this embodiment, the air inlet 105 on the side away from the motor is used as the first air inlet, and the air inlet 105 on the side close to the motor is used as the second air inlet. The guide slope 202a1 corresponding to the first air inlet is used as the first guide slope, and the guide slope 202a1 corresponding to the second air inlet is used as the second guide slope.

[0132] Combination Figure 5 (II) Figure 5 (III) Wherein, the orthographic projections of the leading edge surface 2021 and the trailing edge surface 2022 onto the plane passing through the second end surface 2024 have corresponding leading edge lines 2021a and trailing edge lines 2022a. The line connecting the end of the leading edge line 2021a facing the intake space 2011 and the end of the trailing edge line 2022a facing the intake space 2011 is parallel to the reference plane. The reference plane is perpendicular to the second end surface 2024. The distance between the projections of the end of the leading edge line 2021a facing away from the intake space 2011 and the end of the trailing edge line 2022a facing away from the intake space 2011 onto the reference plane along the extension direction of the connecting line is W1.

[0133] Combination Figure 5 (II) Wherein, the distance between the projections of the two ends of the first guide slope on the reference plane along the extension direction of the connecting line is W2, and W2 satisfies 0.1W1≤W2≤0.5W1, and W2 can be a range of 0.1W1, 0.2W1, 0.3W1, 0.4W1, 0.5W1 or any two of them.

[0134] The distance between the projections of the two ends of the second guide slope onto the reference plane along the direction of the connecting line is W3. W3 satisfies 0.1W1≤W3≤0.5W1. W3 can be a range consisting of 0.1W1, 0.2W1, 0.3W1, 0.4W1, 0.5W1, or any two of them.

[0135] Thus, by precisely controlling the ratio of W2 and W3 to W1, the flow path of the airflow at the leading edge of the first blade 202 can be further fine-tuned. This fine-tuning helps reduce airflow separation and vortex generation at the leading edge of the first blade 202, thereby improving the stability and uniformity of the airflow.

[0136] Reasonable W2 and W3 values ​​can reduce the stress concentration at the edge of the first blade 202 caused by airflow impact, reduce the risk of fatigue damage to the first blade 202, and thus help extend the service life of the first blade 202 and improve the reliability and durability of the fan 1000.

[0137] It should be understood that in some embodiments, the leading edge surface 2021 and the trailing edge surface 2022 of the first blade 202 may be curved surfaces. In this case, the leading edge line 2021a and the trailing edge line 2022a, which are projected onto the plane passing through the second end surface 2024, are curved lines. At this time, the line connecting the end of the leading edge line 2021a toward the air intake space 2011 and the end of the trailing edge line 2022a toward the air intake space 2011 is the line connecting the vertex of the leading edge line 2021a and the vertex of the trailing edge line 2022a.

[0138] Please continue reading. Figure 5 (I) In this application, the projection of the first blade 202 on the reference plane has a first guide slope corresponding to the first guide slope, and the length of the first guide slope is R1. The projection of the first blade 202 on the reference plane has a second guide slope corresponding to the second guide slope, and the length of the second guide slope is R2. Since the first guide slope is adjacent to the first air inlet and the second guide slope is adjacent to the second air inlet, and the air volume of the first air inlet is greater than the air volume of the second air inlet, in order to reduce manufacturing costs, the second guide slope R2 does not exceed the first guide slope R1.

[0139] Furthermore, it is understandable that the second guide slope is located between the middle plate and the lower plate. In this way, when the middle plate is connected to the first blade 202, the first blade 202 has sufficient area to contact the middle plate, thus ensuring the stability of the connection between the first blade 202 and the entire first frame 201.

[0140] Since the leading edge surface 2021 of the first blade 202 is the first contact surface of the airflow when the first blade 202 is in operation, and the trailing edge surface 2022 is the exit surface of the airflow when the first blade 202 is in operation, the first guide structure 203 is provided on the leading edge surface 2021 and the trailing edge surface 2022, which can effectively reduce or eliminate eddies.

[0141] Specifically, during the rotation of multiple first blades 202, eddies are generated as airflow enters the intake space 2011 and exits the intake space 2011 through the airflow channel between two adjacent first blades 202. By setting a first guide structure 203 on the leading edge surface 2021 or the trailing edge surface 2022 of the first blade 202, or by setting the first guide structure 203 on both the leading edge surface 2021 and the trailing edge surface 2022 of the first blade 202, the eddies during the operation of the first impeller 20 can be significantly reduced, the pressure pulsation on the surface of the first blade 202 can be reduced, and the airflow between the first blades 202 can be improved, thereby reducing the start-up noise caused by eddies.

[0142] Specifically, the first guide structure 203 is a sawtooth structure, which includes wave crests and troughs connected in sequence. The wave crests and troughs are distributed along the axial direction of the first impeller 20, that is, along the length of the first blade 202. In this way, the wave crests and troughs connected in sequence can effectively reduce the start-up noise caused by eddies.

[0143] The embodiments of this application will further describe the volute housing 100 of the range hood.

[0144] Please see Figure 11 This application proposes a volute 100 for installation in a range hood 2000, wherein a fan 1000 for absorbing flue gas can be installed in the volute 100.

[0145] like Figures 11-13 As shown, the range hood volute 100 includes a housing 10, which 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 intervals relative to 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 is connected to and perpendicular to the first end plate 101 and the second end plate 102. The first end plate 101, the peripheral side plate 103, and the second end plate 102 together form a wind cavity 107 and an air outlet 106. The air outlet 106 communicates with the wind cavity 107. An air inlet 105 communicating with the wind cavity 107 is provided on the first end plate 101 and / or the second end plate 102.

[0146] 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, thus facilitating the mass production of the range hood volute 100. 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, and 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 fan 1000, and then discharged from the air outlet 106.

[0147] like Figures 14-15As shown, 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 15 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, meaning the first plane is parallel to the side planes of the first end plate 101 and the second end plate 102. The radius of curvature at all points on the avoidance line 103b is greater than that at all points on the first arc 103a and the second arc 103c. This means that the radius of curvature on the avoidance line 103b is the largest compared to the first arc 103a and the second arc 103c. In other words, the curvature of the avoidance line 103b is less than that of the first arc 103a and the second arc 103c, and the avoidance line 103b is smoother overall (more closely resembling a straight line).

[0148] Specifically, the outer peripheral side of the circumferential 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 circumferential 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... Corresponding to the second arc 103c, the avoidance line 103b is an arc-shaped transition line between the first arc 103a and the second arc 103c. That is to say, the avoidance surface 1032 is an arc-shaped transition between the first arc surface 1031 and the second arc surface 1033. 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).

[0149] 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 avoidance line 103b is the largest compared to the first arc 103a and the second arc 103c. Therefore, the avoidance line 103b is smoother than the first arc 103a and the second arc 103c. If the side of the range hood housing 100 has an area exceeding the installation space... In this case, the outer contour of the side portion 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 its volume. Simultaneously, it improves the flow of flue gas at the avoidance surface 1032 of the range hood volute 100, reducing backflow and eddy currents at this surface, and lowering the noise generated during smoke extraction. Furthermore, the connections 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, facilitating the production and connection of the first end plate 101, peripheral side plate 103, and second end plate 102. This not only reduces the mold opening cost of the range hood volute 100 but also lowers its manufacturing difficulty, thus benefiting mass production.

[0150] Furthermore, in some embodiments, the radius of curvature at various points on the second arc 103c is greater than the radius of curvature at various points on the first arc 103a. Therefore, the curvature of the second arc 103c is less than that of the first arc 103a, and the second arc 103c is smoother overall than the first arc 103a. Simultaneously, the radius of curvature at various points on the avoidance line 103b is greater than that of the second arc 103c. In other words, the radius of curvature of the avoidance line 103b is the largest compared to both the first and second arcs 103a and 103c. This means that the curvature of the avoidance line 103b is less than that of both the first and second arcs 103a and 103c, and the avoidance line 103b is smoother overall (more closely approximating a straight line).

[0151] Optionally, such as Figure 14 As shown, the air outlet 106 has an orthographic projection area on the first plane. The first end of the first arc 103a extends to the orthographic projection area of ​​the air outlet 106, and the second end of the first arc 103a is connected to the avoidance line 103b. The first end of the second arc 103c is connected to the avoidance line 103b, and the second end of the second arc 103c extends to the orthographic projection area of ​​the air outlet 106.

[0152] It is easy to understand that the first end of the first arc 103a and the second end of the second arc 103c form the orthographic projection area of ​​the air outlet 106 on the first plane. That is to say, the air outlet 106 of the range hood volute 100 is formed by the first end plate 101, the second end plate 102, the first arc surface 1031, and the second arc surface 1033. Since the peripheral side plate 103 is connected to and perpendicular to the first end plate 101 and the second end plate 102, when the overall shape of the air outlet 106 is... When the shape is square, the surface of the first end plate 101 near the second end plate 102 is perpendicular to both the first arc surface 1031 and the second arc surface 1033, and the surface of the second end plate 102 near the first end plate 101 is perpendicular to both the first arc surface 1031 and the second arc surface 1033. This allows the first end plate 101 and the second end plate 102 to be planar plate structures, which reduces the manufacturing difficulty of the range hood volute 100 and facilitates the mass production of the range hood volute 100.

[0153] Optionally, such as Figure 15 As shown, the outer contour of the peripheral side plate 103 projected onto the first plane includes two oppositely arranged avoidance lines 103b, which are located on both sides of the projected area of ​​the air outlet 106.

[0154] It should be noted that the outer peripheral side of the peripheral side plate 103 includes a first arc surface 1031, a first clearance surface, a second arc surface 1033, and a second clearance surface arranged sequentially and connected along the peripheral direction of the peripheral side plate 103. 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 first clearance surface on the first plane corresponds to the clearance line 103b, the orthographic projection of the second arc surface 1033 on the first plane corresponds to the second arc line 103c, and the shape of the orthographic projection of the second clearance surface on the first plane is the same as the shape of the clearance line 103b. The first clearance surface and the second clearance surface are located on both sides of the air outlet 106. That is to say, the air outlet 106 of the range hood volute 100 is formed by the first end plate 101, the second end plate 102, the first arc surface 1031, and the second clearance surface. Figures 11-12 As shown, the addition of the clearance surface 1032 on the range hood volute 100 reduces the volume of the range hood volute 100 while further improving the flow of flue gas at the clearance surface 1032, reducing the backflow and eddy current phenomenon of flue gas at the clearance surface 1032, increasing the exhaust volume of the air outlet 106, and reducing the noise generated by the range hood volute 100 when smoking.

[0155] Please see Figure 14In 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.

[0156] Further, please see Figure 15 In 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.

[0157] 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 Q 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.

[0158] 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.

[0159] It should be noted that, Figure 16 The middle section represents the complete curve of the Cassini oval curve. The equation of the Cassini oval curve is:

[0160] (x 2 +y 2 ) 2 -2b(x 2 -y2 )=b 4 -c 4 (Where b and c are constants).

[0161] 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:

[0162] (x 2 +y 2 ) 2 -0.5d(x 2 -y 2 )=k 4 -(0.5d) 4 ;

[0163] 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 thus reduce the aerodynamic noise of the flue gas volute 100.

[0164] It should also be noted that, Figure 17 (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 17 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 17 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.

[0165] Figure 17 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 17In 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.

[0166] Please see Figure 13 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.

[0167] In some embodiments, such as Figure 13 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.

[0168] Optionally, 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.

[0169] Optionally, the housing 10 has an air inlet 105, and a guide ring 24 is provided around the air inlet 105. The air inlet 105 is provided on the first end plate 101, and the guide ring 24 is fixed on the first end plate 101; or, the air inlet 105 is provided on the second end plate 102, and the guide ring 24 is fixed on the second end plate 102.

[0170] Optionally, such as Figure 11As shown, the housing 10 has at least two air inlets 105, through which external flue gas can enter the air cavity 107. Both the first end plate 101 and the second end plate 102 are provided with air inlets 105. A guide ring 24 is provided around the air inlet 105 on the first end plate 101. The guide ring 24 can be inclined, which facilitates the external flue gas to enter the air cavity 107 from the air inlet 105 along the inclined guide ring 24, thus guiding the flue gas. A limiting bracket 12 is provided at the air inlet 105 on the second end plate 102. The limiting bracket 12 is used for the installation of the fan 1000 inside the flue hood volute 100 and limits the fan 1000 inside, so that the fan 1000 can be stably installed inside the flue hood volute 100.

[0171] 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 accompanying drawings, they are only for the convenience of describing this application 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. Therefore, the terms used to describe positional relationships in the accompanying drawings are only for illustrative purposes and should not be construed as limiting this patent. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0172] The above description is merely a preferred embodiment of this application and is 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 multiple first blades and a first frame, with the multiple first blades distributed circumferentially along the first frame to form an air intake space; as well as The second impeller is located within the air intake space and is spaced apart from the first impeller. The axis of the first impeller is parallel to the axis of the second impeller. The second impeller includes a plurality of second blades and a second frame. The second frame is mounted on the first frame, and the plurality of second blades are distributed circumferentially along the first frame. A diffuser wind turbine includes a plurality of third blades and a third frame disposed between the first blade and the second blade. The plurality of third blades are arranged sequentially at intervals around the axis of the diffuser wind turbine on the third frame. The axis of the diffuser wind turbine is parallel to the axis of the second wind turbine. Each of the first blades has a leading edge surface facing the air intake space and a trailing edge surface facing away from the air intake space. At least one end of the leading edge surface is provided with a guide surface, which is recessed towards the trailing edge surface.

2. The wind turbine assembly according to claim 1, characterized in that, The diffuser impeller includes: A flow guide ring is fixedly disposed on the side of the first wind turbine along the axis of the first wind turbine, and multiple third blades are connected to the flow guide ring.

3. The wind turbine assembly according to claim 2, characterized in that, The guide ring is provided with an arc-shaped protrusion facing away from the first wind turbine, and / or, the guide ring is provided with a second guide structure on the side facing the axis of the first wind turbine.

4. The wind turbine assembly according to claim 2, characterized in that, The vertical distance between the second blade and the guide ring is L, where L satisfies: 5mm≤L≤15mm.

5. The wind turbine assembly according to claim 1, characterized in that, The rotation direction of the first blade is opposite to that of the second blade.

6. The wind turbine assembly according to claim 5, characterized in that, The direction of rotation of the third blade is opposite to that of the first blade.

7. The wind turbine assembly according to claim 1, characterized in that, The axis of the first wind turbine, the axis of the second wind turbine, and the axis of the diffuser wind turbine all coincide.

8. The wind turbine assembly according to claim 1, characterized in that, The number of the first leaf is N1, and N1 satisfies: 40≤N1≤70; the number of the second leaf is N2, and N2 satisfies: 10≤N2≤60. Where N1 and N2 satisfy: 1.5≤N1 / N2≤4; And / or, N1 and N2 are coprime numbers.

9. The wind turbine assembly according to claim 8, characterized in that, The number of the third leaflets is N3, where N3 satisfies: 10≤N3≤60, and N2 and N3 satisfy: N2=N3.

10. The wind turbine assembly according to claim 1, characterized in that, The guide surface is provided at both ends of the leading edge surface; And / or, the guiding surface is a guiding slope.

11. The wind turbine assembly according to claim 10, characterized in that, The flow guiding slope at one end of the leading edge is a first flow guiding slope, and the flow guiding slope at the other end of the leading edge is a second flow guiding slope. The first flow guiding slope extends from the leading edge to the first end face of the first blade, and the second flow guiding slope extends from the leading edge to the second end face of the first blade.

12. The wind turbine assembly according to claim 11, characterized in that, The orthographic projections of the leading edge surface and the trailing edge surface onto the plane passing through the second end face have corresponding leading edge lines and trailing edge lines. The line connecting the end of the leading edge line facing the air intake space and the end of the trailing edge line facing the air intake space is parallel to the reference plane. The reference plane is perpendicular to the second end face. The distance between the projections of the end of the leading edge line facing away from the air intake space and the end of the trailing edge line facing away from the air intake space onto the reference plane along the extension direction of the connecting line is W1. The distance between the projections of the two ends of the first guide slope on the vertical plane along the extension direction of the connecting line is W2, and W2 satisfies 0.1W1≤W2≤0.5W1; And / or, the distance between the projections of the two ends of the second guide slope on the vertical plane along the extension direction of the connecting line is W3, wherein W3 satisfies 0.1W1≤W3≤0.5W1; And / or, the first blade has a first guide line corresponding to the first guide slope in the vertical projection, the length of the first guide line being R1, and the first blade has a second guide line corresponding to the second guide slope in the vertical projection, the length of the second guide slope being R2, wherein R2≤R1.

13. The wind turbine assembly according to claim 10, characterized in that: At least one of the trailing edge surface and the leading edge surface of the first blade is provided with a first flow guiding structure, which extends along the axial direction of the first impeller.

14. A fan, characterized in that, include: The wind turbine assembly according to any one of claims 1-13; and A range hood volute, the range hood volute comprising a housing, the housing forming a wind cavity and an air inlet and an air outlet communicating with the wind cavity; The wind turbine assembly is located inside the wind cavity.

15. The fan according to claim 14, 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, and an air inlet communicating with the air cavity 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, and the radius of curvature at each point on the clearance line is greater than the radius of curvature at each point on the first arc and the second arc.

16. The fan according to claim 15, 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.

17. The fan according to claim 16, 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 ≤r1*r2≤(0.36d) 2 .

18. The fan according to claim 15, characterized in that, The housing further includes an arc-shaped transition section, one end of the peripheral side plate is connected to the first end plate through the arc-shaped transition section, and the other end of the peripheral side plate is connected to the second end plate through the arc-shaped transition section; Alternatively, the peripheral side plate is connected to and perpendicular to the first end plate and the second end plate.

19. A range hood, characterized in that, include: The main body has an air extraction port, and the main body has a flue connected to the air extraction port. as well as The fan according to any one of claims 14-18, wherein the fan is disposed within the main body, and the fan draws flue gas from the exhaust port into the flue.

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