Fan assembly and range hood

Abstract

The invention discloses a fan assembly and a range hood. The fan assembly comprises a volute, a volute tongue and a check valve, a wind wheel cavity and a wind cavity outlet communicated with the wind wheel cavity are defined by the volute tongue and the volute, the wind wheel cavity is used for installing a wind wheel, the volute tongue comprises a wind wheel side curved surface facing the wind wheel and an air outlet side curved surface facing the wind cavity outlet, and an included angle is formed between the air outlet side curved surface and the wind wheel side curved surface; the check valve is installed on the volute corresponding to the air cavity outlet and comprises an air guide side curved surface, the air guide side curved surface and the air outlet side curved surface are in smooth transition connection and are both concave arc surfaces, an avoiding space is formed, and vortexes generated when airflow impacts the air guide side curved surface and the air outlet side curved surface can exist in the avoiding space. More airflow can smoothly flow out of the air cavity outlet from the area far away from the air outlet side curved surface, the airflow is smooth, the airflow flow flowing back to the wind wheel is reduced, and therefore noise generated by impact of the backflow airflow and the wind wheel is reduced.

Description

Technical Field

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

[0002] The market trend for range hoods is towards higher airflow and higher static pressure, aiming to improve smoke extraction efficiency. However, with increased airflow, noise levels also rise, impacting the user experience. During operation, the air velocity at the fan outlet can reach over 18 m / s. This rapid airflow generates turbulence as it passes through the outlet area, leading to uneven fan flow, severely hindering airflow, and increasing aerodynamic noise. Summary of the Invention

[0003] This application provides a range hood that can solve the problem of excessive noise at the air outlet of the fan.

[0004] In a first aspect, this application provides a wind turbine assembly, the wind turbine assembly comprising:

[0005] Snail shell;

[0006] Wind turbines, including wind turbines;

[0007] A volute tongue, together with the volute casing, forms a wind turbine cavity and a wind cavity outlet communicating with the wind turbine cavity. The wind turbine is installed in the wind turbine cavity. The volute tongue includes a wind turbine side curved surface facing the wind turbine and an air outlet side curved surface facing the wind cavity outlet. The air outlet side curved surface and the wind turbine side curved surface are arranged at an angle.

[0008] A check valve is installed on the volute corresponding to the air cavity outlet. The check valve includes a guide side curved surface, wherein the guide side curved surface and the outlet side curved surface are smoothly connected and both are concave arc surfaces.

[0009] In some embodiments, the volute tongue further includes a transition side surface, which connects the air outlet side surface and the impeller side surface and is a concave arc surface.

[0010] In some embodiments, the check valve has an air guide duct communicating with the air cavity outlet, and the wall of the air guide duct includes the air guide side curved surface;

[0011] The air guide duct forms an air duct outlet at the end away from the air cavity outlet. Along the direction from the air cavity outlet to the air duct outlet, at least one of the air guide side surface and the air outlet side surface is inclined toward the side where the wind turbine side surface is located.

[0012] In some embodiments, the wind turbine cavity has a central axis, the rotation center of the wind turbine is located on the central axis, and the wind turbine outlet is located on one side of the central axis in a first direction; wherein, the first direction is perpendicular to the central axis;

[0013] Along the direction from the outlet of the air cavity to the outlet of the air duct, the width of the air guide duct gradually increases in the first direction, and the width of the air guide duct in the direction of the central axis gradually increases or remains unchanged.

[0014] In some embodiments, the wall of the air duct includes a main wall, at least a portion of which extends along a second direction to guide airflow out of the air duct, wherein the second direction and the first direction are perpendicular to the central axis.

[0015] In some embodiments, the air duct outlet of the check valve is circular;

[0016] The air outlet side surface of the volute tongue has a first outlet edge, and the volute shell has a second outlet edge. The first outlet edge and the second outlet edge enclose the air cavity outlet, and the second outlet edge is a straight line, a curve, or includes multiple lines connected at an angle.

[0017] In some embodiments, the portion of the volute that defines the air cavity outlet includes a tail portion, the tail portion being disposed opposite to the air outlet side surface;

[0018] The check valve has an air duct outlet at one end away from the air chamber outlet, and the tail end is inclined toward the side where the volute tongue is located along the direction from the air chamber outlet toward the air duct outlet.

[0019] In some embodiments, the volute includes a volute casing plate and two volute casing side plates arranged side by side;

[0020] The volute enclosure is connected between the two volute side plates. The volute enclosure includes a enclosure body and a tail. The enclosure body is arranged around the outer periphery of the impeller. The volute tongue is installed on the enclosure body so that the tail, the two volute side plates and the volute tongue surround and form the air cavity outlet.

[0021] In some embodiments, the volute tongue includes a volute tongue body and a second mating part. The volute tongue body has the impeller side curved surface and the air outlet side curved surface, and the second mating part is connected to the portion of the volute tongue body having the air outlet side curved surface.

[0022] The volute has a first mating portion, and the first mating portion and the second mating portion are respectively inserted into and mated with the check valve to define the position of the check valve relative to the volute.

[0023] In some embodiments, the second mating portion and the first mating portion each have a first step, and the check valve extends into the first step and abuts against the step surface of the first step; or;

[0024] The check valve has a second step, and the second mating part and the first mating part respectively extend into the second step and fit against the step surface of the second step.

[0025] In some embodiments, the volute further includes a sleeve, which is sleeved around the first mating portion and the second mating portion;

[0026] The check valve is detachably installed on the socket.

[0027] In some embodiments, the cochlear tongue includes:

[0028] A volute tongue body is disposed within the internal space of the volute casing. The volute tongue body has a side curved surface of the impeller and a side curved surface of the air outlet. A leeward space is formed on the surface of the volute tongue body facing away from the side curved surface of the impeller and the side curved surface of the air outlet.

[0029] At least one mounting rib is provided in the leeward space and integrally formed with the volute tongue body, and the mounting rib is detachably installed on the volute.

[0030] In some embodiments, the cochlear tongue body includes:

[0031] The air outlet sidewall has the aforementioned air outlet curved surface;

[0032] The wind turbine sidewall has the wind turbine side curved surface;

[0033] Two supporting sidewalls are arranged side by side, each of which is connected to the air outlet sidewall and the impeller sidewall respectively, and the surface of each supporting sidewall is in contact with the inner wall surface of the volute.

[0034] Secondly, this application provides a range hood, including a housing and a fan assembly as described above, the fan assembly being installed in the interior space of the housing.

[0035] Based on the fan assembly and range hood of this application embodiment, the guide side curved surface of the check valve and the outlet side curved surface of the volute are smoothly connected, and both the guide side curved surface and the outlet side curved surface are concave arc surfaces, forming a clearance space. The vortex generated by the airflow impacting the guide side curved surface and the outlet side curved surface can exist in this clearance space, allowing more airflow to flow smoothly from the area away from the outlet side curved surface to the air cavity outlet. The airflow is smooth, reducing the airflow flow back to the impeller. In addition, it can also increase the flow area of ​​the air cavity outlet and the inside of the check valve, reducing the pressure of the fluid flowing through the guide side curved surface and the outlet side curved surface, thereby reducing the airflow impacting the guide side curved surface and the outlet side curved surface, and thus reducing the noise generated by the impact of the backflowing airflow on the impeller. Attached Figure Description

[0036] 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.

[0037] Figure 1 This is a three-dimensional structural schematic diagram of a wind turbine assembly according to an embodiment of this application;

[0038] Figure 2 This is a three-dimensional structural diagram of a fan assembly installed in a range hood according to an embodiment of this application;

[0039] Figure 3 This is a three-dimensional structural diagram of a check valve installed on a volute according to an embodiment of this application;

[0040] Figure 4 This is a cross-sectional structural diagram of a range hood according to an embodiment of this application;

[0041] Figure 5 This is a partial cross-sectional view of the volute tongue mounted on the volute shell according to an embodiment of this application;

[0042] Figure 6 This is a three-dimensional structural schematic diagram of a check valve according to an embodiment of this application;

[0043] Figure 7 This is a three-dimensional structural diagram of a volute tongue installed inside a volute shell according to an embodiment of this application;

[0044] Figure 8 This is a three-dimensional structural diagram of the splicing of the second mating part and the first mating part according to an embodiment of this application;

[0045] Figure 9This is a three-dimensional structural diagram of the splicing of the second mating part and the first mating part according to another embodiment of this application;

[0046] Figure 10 This is a three-dimensional structural diagram of the worm tongue according to an embodiment of this application;

[0047] Figure 11 a is a simulation diagram of the turbulent kinetic energy distribution of the fan assembly applied to a range hood according to an embodiment of this application;

[0048] Figure 11 b is a simulation diagram of the turbulent kinetic energy distribution of the fan components of the relevant technology applied to the range hood;

[0049] Figure 12 This is a noise distribution diagram of the fan assembly used in the embodiments of this application and related technologies when applied to a range hood.

[0050] Figure label:

[0051] 10. Fan assembly; 10a. Fan wheel cavity; 10b. Cavity outlet; 10c. Cavity inlet;

[0052] 100. Volute tongue; 101. Impeller side curved surface; 102. Air outlet side curved surface; 1021. First outlet edge; 1022. First transition edge; 1011. Second transition edge; 1012. Impeller side edge; 103. Transition side curved surface; 110. Volute tongue body; 120. Second mating part; 130. Mounting rib; 114. Support sidewall;

[0053] 200. Volute; 210. Volute side plate; 221. Main body of the enclosure; 222. Tail end; 223. Transition section; 211. Second exit edge; 201. First edge line; 202. Second edge line; 230. First mating part; 231. First flange; 232. Second flange; 233. Third flange; 240. Socket; 241. Socket body; 242. Socket flange; 20a. First step;

[0054] 300, Check valve; 301, Air guide side curved surface; 302, Air guide duct; 303, Air duct outlet; 310, Plate; 320, Interface; 400, Connecting part;

[0055] 20. Range hood; 21. Fan wheel; 22. Outer casing; A. First direction; B. Second direction; H. Central axis. Detailed Implementation

[0056] 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.

[0057] The inventors discovered that during the operation of a range hood, the air velocity at the fan outlet can reach over 18 m / s. This rapid airflow generates vortices as it passes through the outlet area, leading to uneven airflow distribution, severely hindering airflow, and increasing aerodynamic noise. Furthermore, the airflow characteristics of multi-blade centrifugal fans typically cause large vortices to form at the fan outlet, increasing flow resistance and worsening noise. As the pressure at the range hood outlet increases, the coverage area of ​​these vortices also increases, further exacerbating the overall noise level of the range hood. Based on this, this application provides a fan assembly and range hood with a flow-guiding and noise-reducing design at the fan outlet to improve the noise problem at the fan outlet.

[0058] like Figure 1 The diagram shown is a three-dimensional structural schematic of a fan assembly 10 according to an embodiment of this application. The fan assembly 10 is installed in a range hood, as shown below. Figure 2 The diagram shown is a three-dimensional structural schematic of a fan assembly 10 applied to a range hood 20 according to an embodiment of this application. The fan assembly 10 includes a fan, which includes a fan wheel. The rotation of the fan wheel enables the range hood 20 to draw in gas from the surrounding environment and discharge the gas from the duct outlet 303 of the fan assembly 10. The airflow generated by the rotation of the fan wheel easily generates eddies at the duct outlet 303 and in the area adjacent to the duct outlet 303, thereby generating noise. This embodiment of the application designs the structure at the duct outlet 303 to reduce flow resistance and noise at the duct outlet 303.

[0059] Combination Figure 3 and Figure 4 The fan assembly 10 includes a volute tongue 100, a volute housing 200, and a check valve 300. The volute tongue 100 and the volute housing 200 enclose a fan wheel cavity 10a and a fan cavity outlet 10b communicating with the fan wheel cavity 10a. The check valve 300 is installed on the volute housing 200 corresponding to the fan cavity outlet 10b. The check valve 300 has a duct outlet 303 communicating with the fan cavity outlet 10b. The fan wheel cavity 10a is used for mounting the fan wheel 21. Of course, the volute housing 200 may have a fan cavity provided according to actual conditions. The impeller 21 is set at the inlet 10c of the air chamber. The rotation of the impeller 21 causes the gas in the environment where the fan assembly 10 is located to be drawn from the air chamber inlet 10c into the impeller chamber 10a, and enter the check valve 300 from the air chamber outlet 10b. The airflow entering the check valve 300 flows out of the check valve 300 from the air duct outlet 303. The check valve 300 is used to control the airflow to flow unidirectionally from the air chamber outlet 10b to the air duct outlet 303, and to prevent the airflow from flowing back into the air chamber from the check valve 300.

[0060] In this embodiment, the impeller 21 is a centrifugal impeller, which is installed in the impeller cavity 10a. When the impeller 21 is running, it can generate negative pressure in the impeller cavity 10a, which causes airflow to be drawn into the impeller cavity 10a. Then, driven by the impeller 21, the airflow is discharged from the air duct outlet 303. During this process, the volute tongue 100 is used to intercept the flow and prevent the impeller 21 from driving the airflow to spin idly in the impeller cavity 10a instead of exiting from the air cavity outlet 10b.

[0061] like Figure 4 As shown, the volute 100 includes a rotor-side curved surface 101 and an outlet-side curved surface 102 arranged at an angle. The rotor-side curved surface 101 faces the rotor 21, and the outlet-side curved surface 102 faces the air cavity outlet 10b. The outlet-side curved surface 102 is used to guide the airflow smoothly to the air cavity outlet 10b. When the airflow is intercepted by the volute 100, and the rotor 21 rotates at a relatively high speed, the pressure at the air cavity outlet 10b is relatively high. When the airflow hits the outlet-side curved surface 102, a portion of the airflow will flow back into the rotor cavity 10a and collide with the rotor 21, generating significant noise. The airflow enters the check valve 300 from the air cavity outlet 10b. During its passage through the check valve 300, a portion of the airflow will also hit the inner wall of the check valve 300 and flow back into the rotor cavity 10a, colliding with the rotor 21 and generating noise. The airflow returning to the impeller 21 after being impacted collides with the airflow flowing towards the duct outlet 303, generating vortices, increasing flow resistance, and interfering with the smooth flow of airflow out of the duct outlet 303. This leads to more airflow returning to the impeller cavity 10a, exacerbating noise generation.

[0062] In this process, the airflow mainly impacts the outlet curved surface 102 of the volute tongue 100 and the inner wall of the check valve 300 adjacent to the outlet curved surface 102. Vortexes are also mainly generated near this part of the wall, thus interfering with the smooth flow of airflow from other areas out of the check valve 300. In this embodiment, the check valve 300 includes a guide curved surface 301, which is smoothly connected to the outlet curved surface 102. Both the guide curved surface 301 and the outlet curved surface 102 are concave arc surfaces, forming a clearance space. Even when the airflow impacts the guide curved surface 301 and the outlet curved surface 102, causing vortices to be generated, the vortices still exist in the clearance space, allowing more airflow to flow smoothly from the air cavity outlet 10b to the air duct outlet 303. The airflow is smooth, reducing the airflow returning to the impeller 21. In addition, it can also increase the flow area of ​​the air cavity outlet 10b and the inside of the check valve 300, reduce the pressure of the fluid flowing through the guide side curved surface 301 and the outlet side curved surface 102, thereby reducing the airflow impacting the guide side curved surface 301 and the outlet side curved surface 102, thereby reducing the noise generated by the impact of the return airflow with the impeller 21.

[0063] In the embodiments of this application, such as Figure 5As shown, the edge of the outlet side curved surface 102 adjacent to the wind turbine side curved surface 101 (i.e., the first transition edge 1022 mentioned below) and the edge of the wind turbine side curved surface 101 adjacent to the outlet side curved surface 102 (i.e., the second transition edge 1011 mentioned below) are both concave arc-shaped, and the wind turbine side curved surface 101 and the outlet side curved surface 102 are smoothly connected, so that the end of the volute tongue 100 forms a crescent-shaped clearance space. The airflow that returns after colliding with the outlet side curved surface 102 or the guide side curved surface 301 can bypass the connection between the wind turbine side curved surface 101 and the outlet side curved surface 102, that is, enter the area between the wind turbine side curved surface 101 and the wind turbine 21 from the crescent-shaped clearance space. Furthermore, since the airflow velocity is high in the middle region of the outlet curved surface 102 and low in the edge region, airflow instability is likely to occur. By setting the edges of the impeller side curved surface 101 and the outlet side curved surface 102 adjacent to each other to be concave arc-shaped, the airflow velocity returning from the middle and edge regions of the outlet side curved surface 102 can be evenly distributed. This allows the returning airflow to enter the region between the impeller side curved surface 101 and the impeller 21 more smoothly, reducing the mutual interference between the returning airflow and the airflow flowing towards the air cavity outlet 10b, further reducing the generation of vortices, and thus reducing aerodynamic noise. In addition, setting the surfaces of the impeller side curved surface 101 and the outlet side curved surface 102 facing each other to be concave arc-shaped can also reduce the area of ​​the outlet side curved surface 102 to a certain extent, thereby reducing the airflow rate of the returning gas impacting the outlet side curved surface 102, and thus reducing noise.

[0064] The volute tongue 100 also includes a transition side surface 103, which connects the air outlet side surface 102 and the impeller side surface 101. The air outlet side surface 102 is smoothly connected to the impeller side surface 101 through the transition side surface 103, and the transition side surface 103 is a concave arc surface. The airflow guided by the transition side surface 103 smoothly enters the area between the impeller side surface 101 and the impeller 21. The surface shape of the transition side surface 103 can be designed to flexibly adapt to the requirements of the distance, angle and other aspects between the air outlet side surface 102 and the impeller side surface 101.

[0065] The air outlet side curved surface 102 has a first transition edge 1022 facing the impeller side curved surface 101, and the first transition edge 1022 is concave arc-shaped. The impeller side curved surface 101 has a second transition edge 1011 facing the air outlet side curved surface 102, and the second transition edge 1011 is concave arc-shaped. When the volute tongue 100 includes a transition side curved surface 103, both the first transition edge 1022 and the second transition edge 1011 are connected to the transition side curved surface 103. In some embodiments, from the middle portion of the first transition edge 1022 toward the edge portion, the distance between the first transition edge 1022 and the second transition edge 1011 remains unchanged or at least the distance gradually decreases. For example, the distance between the middle portion of the first transition edge 1022 and the second transition edge 1011 remains unchanged, while the distance between the edge portions gradually decreases.

[0066] Optionally, the outlet side curved surface 102 and the impeller side curved surface 101 are spaced apart, that is, the first transition edge 1022 of the outlet side curved surface 102 and the second transition edge 1011 of the impeller side curved surface 101 are spaced apart, so as to adapt to the large spacing requirement between the outlet side curved surface 102 and the impeller side curved surface 101. Optionally, the middle portions of the outlet side curved surface 102 and the impeller side curved surface 101 are spaced apart, and the edge portions extend towards each other and connect. In this case, the transition side curved surface 103 can be meniscus, so that the end of the volute tongue 100 has a structure with two sharp corners on the edge and a concave middle.

[0067] In some embodiments, the curvature of the transition side surface 103 remains unchanged from the direction of the impeller side surface 101 toward the outlet side surface 102, or the curvature of the transition side surface 103 gradually increases. Under these two surface types, the sequential connection of the outlet side surface 102, the transition side surface 103 and the impeller side surface 101 can define a fuller structure, so that the returning airflow can flow more smoothly and steadily when passing through the transition side surface 103.

[0068] It should be noted that when the curvature of the transition surface 103 gradually increases from the direction of the wind turbine side surface 101 toward the air outlet side surface 102, the tangents at the connection between the transition surface 103 and the air outlet side surface 102 form an angle, as do the tangents at the connection between the transition surface 103 and the wind turbine side surface 101; when the curvature of the transition surface 103 remains unchanged from the direction of the wind turbine side surface 101 toward the air outlet side surface 102, the tangents at the first transition edge 1022 of the transition surface 103 and the air outlet side surface 102 form an angle, as do the tangents at the second transition edge 1011 of the transition surface 103 and the wind turbine side surface 101. In some other embodiments, the air outlet side curved surface 102 and the impeller side curved surface 101 are directly and smoothly connected, and no transition side curved surface 103 is provided between the air outlet side curved surface 102 and the impeller side curved surface 101. Furthermore, the tangents at the connection between the air outlet side curved surface 102 and the impeller side curved surface 101 are collinear, and the tangents are parallel to the second direction B described below.

[0069] In some embodiments, the outlet side curved surface 102 has a first outlet edge 1021 facing the guide side curved surface 301, and the volute 200 has a second outlet edge 211. The first outlet edge 1021 and the second outlet edge 211 enclose to form an air cavity outlet 10b. The first outlet edge 1021 and the second outlet edge 211 are on the same plane. In this case, from the middle portion of the first outlet edge 1021 toward the edge portion, the distance from the first transition edge 1022 of the outlet side curved surface 102 to the first outlet edge 1021 gradually increases. That is, the distance from the middle portion of the first transition edge 1022 to the plane where the first outlet edge 1021 is located is small, and the distance from the edge portion of the first transition edge 1022 to the plane where the first outlet edge 1022 is located is large. This shortens the flow path of the returning airflow through the middle region of the outlet side curved surface 102, thereby uniformly controlling the flow velocity of the returning airflow through the first transition edge 1022.

[0070] Optionally, the first outlet edge 1021 and the first transition edge 1022 are spaced apart; or, the middle part of the first outlet edge 1021 is tangent to the first transition edge 1022, and the edge part is spaced apart from the first transition edge 1022. In both cases, the outlet side curved surface 102 is retained as a continuous and smooth concave arc surface in the circumferential direction of the air cavity outlet 10b, which helps the airflow through the outlet side curved surface 102 to be smooth.

[0071] The impeller side surface 101 has an impeller side edge 1012. The impeller side surface 101 smoothly transitions to the inner wall of the volute 200 at the impeller side edge 1012. The second transition edge 1011 of the impeller side surface 101 is spaced apart from the impeller side edge 1012 so that the returning airflow, after passing through the second transition edge 1011, flows towards the inner wall of the volute 200 at a more stable and suitable angle under the guidance of the impeller side surface 101, thereby helping to improve the stability of the airflow in the entire impeller cavity 10a.

[0072] The impeller cavity 10a has a central axis H, and the rotation center of the impeller 21 is located at the central axis H of the impeller cavity 10a. In a first direction A perpendicular to the central axis H, the air outlet 10b is located on one side of the central axis H, so that the airflow in the impeller cavity 10a is sent out from the side deviating from the central axis. The check valve 300 has an air guide duct 302 communicating with the air outlet 10b. The wall of the air guide duct 302 includes an air guide side curved surface 301. The end of the air guide duct 302 away from the air outlet 10b forms an air duct outlet 303. The airflow in the impeller cavity 10a enters the air guide duct 302 from the air outlet 10b and flows out from the air duct outlet 303. The wall of the air guide duct 302 further guides the airflow passing through the air outlet 10b to flow out of the air duct outlet 303.

[0073] Along the direction from the air cavity outlet 10b to the air duct outlet 303, at least one of the guide side curved surface 301 and the outlet side curved surface 102 is inclined toward the side where the impeller side curved surface 101 is located, so as to increase the airflow area, reduce the pressure on the airflow, and facilitate smooth airflow. Optionally, along the direction from the air cavity outlet 10b to the air duct outlet 303, both the guide side curved surface 301 and the outlet side curved surface 102 are inclined toward the side where the impeller side curved surface 101 is located, so that in the direction from the air cavity outlet 10b to the air duct outlet 303, the pressure on the airflow gradually decreases when it flows near the air cavity outlet 10b and through the guide air duct 302, further reducing the return airflow and thus reducing noise.

[0074] In some embodiments, the flow area of ​​the air guide duct 302 remains constant or gradually increases along the direction from the air cavity outlet 10b to the air duct outlet 303. When the flow area of ​​the air guide duct 302 gradually increases along the direction from the air cavity outlet 10b to the air duct outlet 303, the pressure on the airflow flowing through the air guide duct 302 also gradually decreases, which helps the airflow to flow smoothly out of the air guide duct 302 and reduces noise.

[0075] Understandably, based on the air outlet characteristics of the impeller 21, the wall surface of the air guide duct 302, which is relatively set in the first direction A, is easily impacted by airflow. Optionally, along the direction from the air cavity outlet 10b to the air duct outlet 303, the width of the air guide duct 302 gradually increases in the first direction A. The width of the air guide duct 302 in the direction of the central axis H gradually increases or remains unchanged. In this way, in the direction from the air cavity outlet 10b to the air duct outlet 303, the flow area of ​​the air guide duct 302 can be gradually increased, and the air can be diffused in the first direction A, so that the airflow can flow out of the air guide duct 302 more smoothly.

[0076] When the air guide side surface 301 is inclined toward the side of the impeller side surface 101 (i.e., toward the central axis H) along the direction from the air cavity outlet 10b toward the air duct outlet 303, in some embodiments, the wall of the air guide duct 302 includes the main wall of the air duct. The main wall of the air duct and the air guide side surface 301 enclose the air guide duct 302 to form the air guide duct 302. At least a portion of the main wall of the air duct extends along the second direction B to guide the airflow in the air guide duct 302 out of the air guide duct 302, so that the air outlet of the air guide duct 302 is smooth. The first direction A and the second direction B are perpendicular to the central axis H. Optionally, in the first direction A, the portion of the main wall of the air duct that is opposite to the guide side curved surface 301 extends along the second direction B, so that the airflow in the first direction A flows smoothly out of the guide air duct 302 in the region away from the guide side curved surface 301. In this way, a vortex zone is formed in the region adjacent to the guide side curved surface 301, and a quiescent zone is formed in the region away from the guide side curved surface 301, reducing airflow interference between the two regions.

[0077] The shapes of both the main wall surface of the duct and the air-guiding side curved surface 301 determine the shape of the duct outlet 303. The shape of the duct outlet 303 can be similar to or dissimilar to the shape of the air cavity outlet 10b. In some embodiments, such as Figure 6 As shown, the check valve 300 may include multiple plates 310, which are spliced ​​together to form an air duct 302. One of the plates 310 has an air-guiding side curved surface 301, and the surfaces of the remaining plates 310 are spliced ​​together to form the main wall of the air duct, so as to form a smooth air duct 302 by splicing together according to the shapes of the air duct outlet 303 and the air cavity outlet 10b.

[0078] In some embodiments, the air duct outlet 303 of the check valve 300 is circular so that the portion of the check valve 300 having the air duct outlet 303 can interface with other structures. Optionally, the check valve 300 also includes a valve body interface 320, which is annular and connected to the portion of the plurality of plates 310 that defines the air duct outlet 303. The valve body interface 320 and the plurality of plates 310 are integrally formed, and the plurality of plates 310 interface with other structures through the valve body interface 320.

[0079] In some embodiments, such as Figure 7 As shown, the air outlet side curved surface 102 of the volute tongue 100 has a first outlet edge 1021, and the volute shell 200 has a second outlet edge 211. The first outlet edge 1021 and the second outlet edge 211 are on the same plane and enclose each other to form the air cavity outlet 10b. The second outlet edge 211 can be a straight line, a curve, or include multiple lines connected at an angle. When the second outlet edge 211 is a straight line, the shape of the air cavity outlet 10b can be semi-circular, semi-elliptical, etc. When the second outlet edge 211 is a curve, the shape of the air cavity outlet 10b can be crescent-shaped, spindle-shaped, etc. When the second outlet edge 211 includes multiple lines connected at an angle, the second outlet edge 211 can include 2, 3, 4, or other line segments at an angle, and the multiple lines are connected end-to-end with the first outlet edge 1021 to enclose and form the air cavity outlet 10b. When the air cavity outlet 10b has the above-mentioned shape, the air duct outlet 303 can be set to be circular and formed by splicing multiple plates 310 to form the air guide duct 302.

[0080] Optionally, when the second exit edge 211 includes three lines, one of the lines is the first edge 201, which extends in a direction parallel to the central axis H and is positioned opposite to the first exit edge 1021 in the first direction A. The remaining two lines are the second edges 202, which both extend in the first direction A and are parallel to each other. Each second edge 202 is connected between the first edge 201 and the first exit edge 1021. At this time, the check valve 300 can be configured with four plates 310. One plate 310 is corresponding to the first outlet edge 1021 and has a guide side curved surface 301. The remaining three plates 310 are respectively corresponding to the first edge 2013 and the two sections of the second edge 202. The portions of the three plates 310 facing the air cavity outlet 10b are approximately flat. In the direction from the air cavity outlet 10b to the air duct outlet 303, the three plates 310 gradually bend and enclose the plate 310 with the guide side curved surface 301 to form a circular air duct outlet 303. The middle portion of the plate 310 corresponding to the first edge 201 always extends along the second direction B to guide a portion of the fluid in the guide air duct 302 to flow out of the guide air duct 302 along the second direction B.

[0081] In some embodiments, the portion of the volute 200 defining the air cavity outlet 10b includes a tail 222. The tail 222 is disposed opposite to the outlet side curved surface 102 in a first direction A. Airflow passing through the tail 222 in the impeller cavity 10a further enters the air guide duct 302. Along the direction from the air cavity outlet 10b toward the air duct outlet 303, the tail 222 is inclined toward the side where the volute tongue 100 is located. That is, both the tail 222 and the outlet side curved surface 102 are inclined toward the side where the central axis H is located, so as to guide the airflow out of the air cavity outlet 10b. The volute 200 also includes a transition portion 223, which is connected to the end of the tail 222 away from the air cavity outlet 10b. The transition portion 223 extends along a second direction B to guide the airflow toward the tail 222.

[0082] In some embodiments, the volute 200 includes a volute enclosure and two volute side plates 210 arranged side by side. The volute enclosure is connected between the two volute side plates 210. The volute enclosure includes an enclosure body 221, a tail 222, and a transition portion 223. The transition portion 223 is connected between the tail 222 and the enclosure body 221. The enclosure body 221 is arranged around the outer periphery of the impeller 21. The volute tongue 100 is installed on the enclosure body 221 so that the tail 222, the two volute side plates 210, and the volute tongue 100 enclose and form the air cavity outlet 10b. At this time, the tail 222 and the two volute side plates 210 together form a second outlet edge 211 towards the edge of the check valve 300. The tail 222 forms a first edge 201 towards the edge of the check valve 300. The first edge 201 can be straight or curved. The volute side plates 210 form a second edge 202 towards the edge of the check valve 300. The second edge 202 can be straight or curved.

[0083] The volute tongue 100 includes a volute tongue body 110, which includes a wind turbine sidewall and an air outlet sidewall. The wind turbine sidewall has a wind turbine side curved surface 101 and is located inside the wind turbine cavity 10a. The air outlet sidewall has an air outlet side curved surface 102. The air outlet sidewall and the tail 222 of the volute casing are arranged opposite each other in the first direction A. The volute 200 has a first mating part, and the volute tongue 100 also includes a second mating part 120. The second mating part 120 is connected to the air outlet side wall, and the first mating part and the second mating part 120 are spliced ​​together to form a docking part. The docking part is inserted into the check valve 300 to make the air outlet side curved surface 102 and the air guide side curved surface 301 smoothly transition and connect. The check valve 300 is tightly fitted to the walls of the first mating part and the second mating part 120 respectively, sealing the gap between the first mating part, the second mating part 120 and the check valve 300, and limiting the position of the check valve 300 relative to the volute 200. It is easy to assemble and has good connection stability. At the same time, it can directly align the relative positions of the air outlet side curved surface 102 and the air guide side curved surface 301, preventing the airflow from being negatively interfered with due to poor alignment between the air outlet side curved surface 102 and the air guide side curved surface 301.

[0084] In some embodiments, the first mating part is connected to the two volute side plates 210 and the tail 222, so that the first mating part and the second mating part 120 surround to form a smooth and complete circumferential docking part, and the docking part is smoothly inserted into the check valve 300 and has better sealing performance.

[0085] In some embodiments, the portion of the second mating part 120 connected to the volute body 110 is in a concave arc shape similar to the first outlet edge 1021. Both the portion of the second mating part 120 connected to the volute body 110 and the first mating part extend away from the air cavity outlet 10b to engage with the check valve 300, facilitating the alignment of the air outlet curved surface 102 and the air guide curved surface 301.

[0086] In some embodiments, the first mating part includes a first flange 231 and two second flanges 232. The first flange 231 is connected to the first edge 201 of the tail 222 and is integrally formed with the tail 222. Each of the second flanges 232 is connected to the second edge 202 of one of the volute side plates 210 and is integrally formed with the corresponding volute side plate 210. The second mating part 120 is arranged opposite to the first flange 231 in a direction perpendicular to the two volute side plates 210 arranged side by side (first direction A), and is respectively fitted with the two second flanges 232. The first flange 231, the two second flanges 232 and the second mating part 120 are inserted into the check valve 300 to form a circumferentially closed structure and achieve a good sealing effect.

[0087] In some embodiments, the first mating part and the second mating part 120 each have a first step 20a, and the check valve 300 extends into the first step 20a and abuts against the step surface of the first step 20a. At this time, as... Figure 8 As shown, the first mating part may also include a third flange 233. The third flange 233 is connected to the part of the main body 221 facing the tail 222. The first flange 231, the two second flanges 232 and the third flange 233 enclose to form a docking opening. The second mating part 120 is provided in the docking opening, and the first step 20a of the second mating part 120 and the first mating part are spliced ​​to form a step groove for the check valve 300 to be inserted, thereby limiting the position of the check valve 300 relative to the volute 200 in the second direction B and the plane perpendicular to the second direction B. At this time, the air guide side curved surface 301 of the check valve 300 is directly connected to the air outlet side curved surface 102 of the volute tongue 100 to achieve a smooth transition connection.

[0088] Optionally, when the first mating part includes a first flange 231, two second flanges 232 and a third flange 233, the volute 200 also includes a sleeve 240. The sleeve 240 has a sleeve opening, and the first flange 231, two second flanges 232 and the third flange 233 extend into the sleeve opening and are fixedly connected to the sleeve 240 by welding, snap-fit ​​or other means to limit the relative position of the first flange 231, two second flanges 232 and the third flange 233. The check valve 300 is detachably installed on the sleeve 240. At this time, the second mating part 120 is provided at the docking opening. The second mating part 120 extends along the first direction A and away from the first flange 231 to avoid the air cavity outlet 10b, and extends to fit against the wall surface of the two second flanges 232 and the third flange 233, sealing the area between the two second flanges 232 and the third flange 233, making the structure compact, improving the installation stability of the volute tongue 100, and preventing the volute tongue 100 from deforming.

[0089] In some embodiments, the check valve 300 has a second step, and the second mating portion 120 and the first mating portion respectively extend into the second step and abut against the step surface of the second step. Optionally, as Figure 9 As shown, the first mating part consists only of a first flange 231 and two second flanges 232. The second mating part 120, the first flange 231, and the two second flanges 232 extend into the second step of the check valve 300 and fit against the step surface of the second step, thereby defining the position of the check valve 300 relative to the volute 200 in the second direction B and in a plane perpendicular to the second direction B. At this time, the air guide side curved surface 301 of the check valve 300 and the air outlet side curved surface 102 of the volute tongue 100 are connected through the wall surface of the second mating part 120 to achieve a smooth transition connection.

[0090] Optionally, when the first mating part includes only the first flange 231 and two second flanges 232, the volute 200 also includes a sleeve 240. The sleeve 240 has a sleeve opening, and the second mating part 120, the first flange 231 and the two second flanges 232 extend into the sleeve opening and are fixedly connected to the sleeve 240 by welding, snap-fit ​​or other means to limit the relative position of the second mating part 120, the first flange 231 and the two second flanges 232. The check valve 300 is detachably installed on the sleeve 240. At this time, one part of the second mating part 120 extends along the second direction B to insert into the second step of the check valve 300, and the other part of the second mating part 120 extends along the first direction A and toward the side away from the first flange 231 to avoid the air cavity outlet 10b, and extends to fit against the wall surface that defines the socket opening of the sleeve 240. The structure is compact, which helps to improve the installation stability of the volute tongue 100 and prevent the volute tongue 100 from deforming.

[0091] The socket 240 includes a socket body 241 and a socket flange 242. The socket body 241 surrounds the first mating part and the second mating part 120, and the three are fixedly connected. The socket body 241 defines the relative position between the structures of the first mating part and the second mating part 120, preventing deformation of the first mating part and the second mating part 120 from affecting the sealing performance. The socket flange 242 is connected to the socket body 241 at an included angle. The socket flange 242 and the socket body 241 can be integrally formed to improve the structural strength of the socket 240.

[0092] The sleeve flange 242 is flat, wherein the part of the check valve 300 that is not inserted into the second mating part 120 is fitted together. That is, the part of the check valve 300 that extends along the first direction A and away from the first flange 231 is fitted together, and the check valve 300 is also fitted together with the sleeve flange 242, thereby increasing the contact area between the check valve 300 and the second mating part 120 and the sleeve flange 242 respectively, further improving the sealing effect and improving the installation stability.

[0093] The volute tongue body 110 is disposed within the internal space of the volute casing 200. The volute tongue body 110 is fitted against the inner wall surface of the surrounding plate body 221, allowing a smooth transition between the impeller-side curved surface 101 and the inner wall surface of the surrounding plate body 221. A leeward space is formed on the surface of the volute tongue body 110 facing away from the impeller-side curved surface 101 and the outlet-side curved surface 102. In some embodiments, such as... Figure 10 As shown, the volute tongue also includes at least one mounting rib 130. The mounting rib 130 is located in the leeward space and is integrally formed with the volute tongue body 110. The mounting rib 130 avoids the second mating part 120 and is detachably mounted to the surrounding plate body 221 of the volute housing 200 to improve the fit between the volute tongue body 110 and the inner wall surface of the surrounding plate body 221, thereby making the impeller side curved surface 101 and the inner wall surface of the surrounding plate body 221 smoothly transition. The surface of the volute tongue body 110 also fits against the wall surface of the volute housing 200 to seal the leeward space, preventing airflow in the impeller cavity 10a and the leeward space from interfering with each other through the gap between the volute tongue body 110 and the volute housing 200.

[0094] In some embodiments, the volute tongue body 110 further includes two supporting sidewalls 114, which are arranged side by side. Each supporting sidewall 114 is connected to the air outlet sidewall and the impeller sidewall, respectively, to improve the structural strength of the volute tongue 100. The surface of each supporting sidewall 114 is in contact with the inner wall surface of the volute shell 200 to prevent air leakage between the volute tongue 100 and the volute shell 200.

[0095] In some embodiments, the volute tongue body 110 further includes a transition sidewall with a transition side curved surface 103. The transition sidewall connects the impeller sidewall and the air outlet sidewall. The surfaces of the transition sidewall, impeller sidewall, air outlet sidewall, and two supporting sidewalls 114 facing away from the impeller cavity 10a together form a leeward space. When the volute tongue 100 also includes a second mating part 120, the second mating part 120 is integrally formed with the impeller sidewall.

[0096] This application also provides a range hood 20, which includes a housing 22, a fan, and a fan assembly 10 as described above. The specific structure of the fan assembly 10 is as described in the above embodiments. The fan assembly 10 is installed on the housing 22, which has an oil suction port facing the stove. The fan includes a fan wheel 21. The fan wheel 21 rotates to suck up the oil fumes from the oil suction port and discharge them to the duct outlet 303. The fan wheel 21 can be a centrifugal fan. The fan wheel 21 is installed in the fan wheel cavity 10a of the fan assembly 10. Since the range hood 20 adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described in detail here.

[0097] The following experiment compares the air output effect of the fan assembly in the related technology applied to the range hood 20 with that of the fan assembly 10 in the embodiment of this application applied to the range hood 20. The difference between the fan assembly in the related technology and the fan assembly 10 in the embodiment of this application is that the air outlet side curved surface 102 of the volute tongue 100 and the air guide side curved surface 301 of the check valve 300 are replaced with flat surfaces. The rest of the structure is the same as that of the fan assembly 10 in the embodiment of this application.

[0098] Figure 11 a is a simulation diagram of the turbulent kinetic energy distribution of the fan assembly 10 applied to the range hood 20 according to an embodiment of this application. Figure 11 b is a simulation diagram of the turbulent kinetic energy distribution of the fan component 10 applied to the range hood 20, based on related technologies. Figure 11 a and Figure 11 As can be seen from b, the fan assembly 10 in this embodiment of the application significantly reduces the area where eddies exist and improves the uniformity of airflow at the air cavity outlet 10b.

[0099] Figure 12 This is a noise distribution diagram of the fan assembly 10 in the embodiments of this application and related technologies applied to the range hood 20. Figure 12 As can be seen, the fan assembly 10 of this application embodiment can effectively reduce the operating noise of the range hood 20. Compared with the fan assembly in the related art, the operating noise of the fan assembly 10 of this application embodiment is reduced by about 1dB, which significantly improves the noise quality of the kitchen.

[0100] 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.

[0101] 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 fan assembly, characterized in that, The wind turbine assembly includes: Snail shell; Wind turbines, including wind turbines; A volute tongue, together with the volute casing, forms a wind turbine cavity and a wind cavity outlet communicating with the wind turbine cavity. The wind turbine is installed in the wind turbine cavity. The volute tongue includes a wind turbine side curved surface facing the wind turbine and an air outlet side curved surface facing the wind cavity outlet. The air outlet side curved surface and the wind turbine side curved surface are arranged at an angle. A check valve is installed on the volute corresponding to the air cavity outlet. The check valve includes a guide side curved surface, wherein the guide side curved surface and the outlet side curved surface are smoothly connected and both are concave arc surfaces.

2. The wind turbine assembly according to claim 1, characterized in that, The volute tongue also includes a transition side surface, which connects the air outlet side surface and the impeller side surface, and is a concave arc surface.

3. The wind turbine assembly according to claim 1 or 2, characterized in that, The check valve has an air guide duct that communicates with the outlet of the air chamber, and the wall of the air guide duct includes the air guide side curved surface. The air guide duct forms an air duct outlet at the end away from the air cavity outlet. Along the direction from the air cavity outlet to the air duct outlet, at least one of the air guide side surface and the air outlet side surface is inclined toward the side where the wind turbine side surface is located.

4. The wind turbine assembly according to claim 3, characterized in that, The wind turbine cavity has a central axis, the rotation center of the wind turbine is located on the central axis, and the outlet of the wind turbine is located on one side of the central axis in a first direction; wherein, the first direction is perpendicular to the central axis; Along the direction from the outlet of the air cavity to the outlet of the air duct, the width of the air guide duct gradually increases in the first direction, and the width of the air guide duct in the direction of the central axis gradually increases or remains unchanged.

5. The wind turbine assembly according to claim 4, characterized in that, The wall of the air guide duct includes a main wall, at least a portion of which extends along a second direction to guide the airflow in the air guide duct out of the air guide duct. The second direction and the first direction are perpendicular to the central axis.

6. The wind turbine assembly according to claim 3, characterized in that, The air duct outlet of the check valve is circular; The air outlet side surface of the volute tongue has a first outlet edge, and the volute shell has a second outlet edge. The first outlet edge and the second outlet edge enclose the air cavity outlet, and the second outlet edge is a straight line, a curve, or includes multiple lines connected at an angle.

7. The wind turbine assembly according to claim 1, characterized in that, The portion of the volute that defines the air cavity outlet includes a tail portion, which is disposed opposite to the air outlet side curved surface; The check valve has an air duct outlet at one end away from the air chamber outlet, and the tail end is inclined toward the side where the volute tongue is located along the direction from the air chamber outlet toward the air duct outlet.

8. The wind turbine assembly according to claim 7, characterized in that, The volute includes a volute casing plate and two volute casing side plates arranged side by side; The volute enclosure is connected between the two volute side plates. The volute enclosure includes a enclosure body and a tail. The enclosure body is arranged around the outer periphery of the impeller. The volute tongue is installed on the enclosure body so that the tail, the two volute side plates and the volute tongue surround and form the air cavity outlet.

9. The wind turbine assembly according to claim 1, characterized in that, The volute tongue includes a volute tongue body and a second mating part. The volute tongue body has the impeller side curved surface and the air outlet side curved surface. The second mating part is connected to the part of the volute tongue body that has the air outlet side curved surface. The volute has a first mating portion, and the first mating portion and the second mating portion are respectively inserted into and mated with the check valve to define the position of the check valve relative to the volute.

10. The wind turbine assembly according to claim 9, characterized in that, The second mating part and the first mating part each have a first step, and the check valve extends into the first step and fits against the step surface of the first step; or; The check valve has a second step, and the second mating part and the first mating part respectively extend into the second step and fit against the step surface of the second step.

11. The wind turbine assembly according to claim 9, characterized in that, The volute also includes a sleeve, which is sleeved around the first mating part and the second mating part; The check valve is detachably installed on the socket.

12. The wind turbine assembly according to claim 1, characterized in that, The cochlear tongue includes: A volute tongue body is disposed within the internal space of the volute casing. The volute tongue body has a side curved surface of the impeller and a side curved surface of the air outlet. A leeward space is formed on the surface of the volute tongue body facing away from the side curved surface of the impeller and the side curved surface of the air outlet. At least one mounting rib is provided in the leeward space and integrally formed with the volute tongue body, and the mounting rib is detachably installed on the volute.

13. The wind turbine assembly according to claim 12, characterized in that, The cochlear tongue body includes: The air outlet sidewall has the aforementioned air outlet curved surface; The wind turbine sidewall has the wind turbine side curved surface; Two supporting sidewalls are arranged side by side, each of which is connected to the air outlet sidewall and the impeller sidewall respectively, and the surface of each supporting sidewall is in contact with the inner wall surface of the volute.

14. A range hood, characterized in that, include: shell; and The fan assembly as claimed in any one of claims 1-13, wherein the fan assembly is installed in the interior space of the housing.

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