Volute tongue, fan assembly and range hood

Abstract

The utility model discloses a volute tongue, a fan assembly and a range hood. The volute tongue comprises a wind wheel side curved surface arranged towards a wind wheel of the fan assembly and an air outlet side curved surface arranged towards an air cavity outlet of the fan assembly, the air outlet side curved surface and the wind wheel side curved surface are arranged in an included angle mode so that airflow in the volute inner space where the wind wheel is located can be intercepted and can flow out of the air cavity outlet, and the air outlet side curved surface is a concave arc surface. The edges, adjacent to each other, of the air outlet side curved surface and the wind wheel side curved surface are in concave arc shapes, the air outlet side curved surface and the wind wheel side curved surface are in smooth transition connection, the flow speed of airflow flowing back from the middle area and the edge area of the air outlet side curved surface can be uniform, and the flowing-back airflow can enter the area between the wind wheel side curved surface and the wind wheel more stably; in addition, the area of the air outlet side curved surface can be reduced to a certain degree, the air flow of backflow air impacting the air outlet side curved surface is further reduced, and therefore noise is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of range hoods, and in particular to a volute, a fan assembly and a range hood. Background Art

[0002] Range hoods are trending towards high air volume and high static pressure in the market, aiming to improve fume extraction. However, as air volume increases, so does noise levels, which can negatively impact the user experience. During range hood operation, the wind speed at the fan outlet can reach over 18 m / s. This rapidly flowing airflow can impact the walls of surrounding structural components as it passes through the outlet, generating backflow gas. This backflow can also be unevenly distributed across various areas, severely hindering airflow and increasing aerodynamic noise. Utility Model Content

[0003] The embodiment of the present application provides a range hood that can solve the problem of loud noise at the air outlet of the fan.

[0004] In a first aspect, an embodiment of the present application provides a volute tongue mounted on a volute of a fan assembly, the volute tongue comprising:

[0005] The wind wheel side curved surface is arranged toward the wind wheel of the wind turbine assembly;

[0006] The air outlet side curved surface is arranged toward the air cavity outlet of the fan assembly, and the air outlet side curved surface is arranged at an angle to the wind wheel side curved surface, so as to intercept the airflow in the internal space of the volute where the wind wheel is located and make the airflow flow out from the air cavity outlet;

[0007] The wind outlet side curved surface is a concave arc surface, the edges of the wind outlet side curved surface and the wind wheel side curved surface adjacent to each other are both concave arc-shaped, and the wind outlet side curved surface and the wind wheel side curved surface are smoothly transitioned and connected.

[0008] In some embodiments, the volute tongue further includes a transition side curved surface, the wind wheel side curved surface is smoothly transitioned to the wind outlet side curved surface through the transition side curved surface, and the transition side curved surface is a concave arc surface.

[0009] In some embodiments, the wind outlet side curved surface and the wind wheel side curved surface are spaced apart; or,

[0010] The middle parts of the wind outlet side curved surface and the wind wheel side curved surface are spaced apart, and the edge parts thereof extend toward each other and are connected.

[0011] In some embodiments, the curvature of the transition side curved surface remains unchanged or gradually increases from the wind wheel side curved surface toward the wind outlet side curved surface.

[0012] In some embodiments, the outlet-side curved surface is directly and smoothly connected to the rotor-side curved surface.

[0013] In some embodiments, the wind outlet side curved surface and the wind wheel side curved surface are axially symmetrical about the same plane.

[0014] In some embodiments, the wind outlet side curved surface has a first outlet edge away from the wind wheel side curved surface, and the first outlet edge and the second outlet edge of the volute are combined to form the wind cavity outlet;

[0015] The wind-out side curved surface further has a first transition edge adjacent to the wind wheel side curved surface, and the first transition edge is in a concave arc shape;

[0016] From the middle portion of the first outlet edge toward the edge portion, the distance from the first transition edge to the first outlet edge gradually increases.

[0017] In some embodiments, the first outlet edge is spaced apart from the first transition edge; or

[0018] A middle portion of the first outlet edge is tangent to the first transition edge, and an edge portion is spaced apart from the first transition edge.

[0019] In some embodiments, the rotor side curved surface has a rotor side edge away from the wind outlet side curved surface, and the rotor side curved surface is smoothly transitionally connected to the inner wall surface of the volute at the rotor side edge;

[0020] The wind wheel side curved surface further has a second transition edge adjacent to the wind outlet side curved surface, and the second transition edge is in a concave arc shape;

[0021] The second transition edge is spaced apart from the side edge of the wind wheel.

[0022] In some embodiments, the snail tongue comprises:

[0023] The volute tongue body has the wind rotor side curved surface and the wind outlet side curved surface, and a leeward space is formed on the surface of the volute tongue body facing away from the wind rotor side curved surface and the wind outlet side curved surface; and

[0024] At least one mounting rib is provided in the leeward space and is integrally formed with the volute tongue body. The mounting rib is detachably mounted on the volute.

[0025] In some embodiments, the volute tongue body comprises:

[0026] An air outlet side wall having the air outlet side curved surface;

[0027] The wind wheel side wall has the wind wheel side curved surface;

[0028] Two supporting side walls are arranged side by side, each supporting side wall is connected to the air outlet side wall and the wind wheel side wall respectively, and the surface of each supporting side wall is used to fit with the inner wall surface of the volute.

[0029] In the second aspect, an embodiment of the present application provides a fan assembly, including a volute, a wind wheel and the volute tongue as described above, the volute tongue and the volute enclose a wind wheel cavity and a wind cavity outlet connected to the wind wheel cavity, the wind wheel is arranged in the wind wheel cavity and installed on the volute.

[0030] In some embodiments, the fan assembly further includes a check valve, which is installed on the volute corresponding to the air cavity outlet. The check valve includes an air-guiding side curved surface, which is smoothly transitioned to the air-outlet side curved surface.

[0031] In a third aspect, an embodiment of the present application provides a range hood comprising a housing and the fan assembly as described above, wherein the fan assembly is installed in an internal space of the housing.

[0032] Based on the volute tongue, fan assembly, and range hood of the embodiments of the present application, by configuring the adjacent surfaces of the impeller-side curved surface and the outlet-side curved surface to be concave arcs, the velocity of the airflow returning from the middle and edge regions of the outlet-side curved surface can be uniformed, allowing the returning airflow to more smoothly enter the area between the impeller-side curved surface and the impeller, thereby reducing the interference of the returning airflow with the airflow flowing toward the air cavity outlet, further reducing the generation of vortices, and thus reducing aerodynamic noise. In addition, configuring the adjacent surfaces of the impeller-side curved surface and the outlet-side curved surface to be concave arcs can also reduce the area of ​​the outlet-side curved surface to a certain extent, thereby reducing the amount of returning gas that strikes the outlet-side curved surface, thereby reducing noise. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without paying any creative work.

[0034] Figure 1 This is a schematic diagram of the three-dimensional structure of a fan assembly according to an embodiment of the present application;

[0035] Figure 2 This is a schematic diagram of the three-dimensional structure of a fan assembly installed on a range hood according to an embodiment of the present application;

[0036] Figure 3 This is a schematic diagram of the three-dimensional structure of the check valve corresponding to the volute installation according to one embodiment of the present application;

[0037] Figure 4 This is a schematic cross-sectional structural diagram of a range hood according to an embodiment of the present application;

[0038] Figure 5 This is a partial cross-sectional structural diagram of a volute tongue installed on a volute according to an embodiment of the present application;

[0039] Figure 6 This is a schematic diagram of the three-dimensional structure of a check valve according to an embodiment of the present application;

[0040] Figure 7 This is a schematic diagram of the three-dimensional structure of a volute tongue installed in a volute according to an embodiment of the present application;

[0041] Figure 8 This is a schematic diagram of a three-dimensional structure of the second matching portion and the first matching portion spliced ​​together according to an embodiment of the present application;

[0042] Figure 9 This is a schematic diagram of a three-dimensional structure of the second matching portion and the first matching portion spliced ​​together according to another embodiment of the present application;

[0043] Figure 10 This is a schematic diagram of the three-dimensional structure of a snail tongue according to an embodiment of the present application;

[0044] Figure 11 Figure (a) is a simulation diagram of turbulent kinetic energy distribution of a fan assembly according to an embodiment of the present application applied to a range hood;

[0045] Figure 11 Figure (b) is a simulation diagram of turbulent kinetic energy distribution of a fan assembly in the related art applied to a range hood;

[0046] Figure 12 This is a noise test distribution diagram of the fan assembly in the embodiments of the present application and related technologies applied to a range hood.

[0047] Reference numerals:

[0048] 10. Fan assembly; 10a. Wind wheel cavity; 10b. Wind cavity outlet; 10c. Wind cavity inlet;

[0049] 100, volute tongue; 101, rotor side curved surface; 102, outlet side curved surface; 1021, first outlet edge; 1022, first transition edge; 1011, second transition edge; 1012, rotor side edge; 103, transition side curved surface; 110, volute tongue body; 120, second mating portion; 130, mounting rib; 114, supporting side wall;

[0050] 200, volute; 210, volute side plate; 221, enclosure body; 222, tail portion; 223, transition portion; 211, second outlet edge; 201, first edge line; 202, second edge line; 230, first mating portion; 231, first flange; 232, second flange; 233, third flange; 240, socket member; 241, socket body; 242, socket flange; 20a, first step;

[0051] 300, check valve; 301, air guide side curved surface; 302, air guide duct; 303, duct outlet; 310, plate; 320, interface; 400, docking portion;

[0052] 20. Range hood; 21. Fan wheel; 22. Housing; A. First direction; B. Second direction; H. Center axis. DETAILED DESCRIPTION

[0053] In order to make the purpose, technical solutions and advantages of this application more clearly understood, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0054] The inventors discovered that during the operation of the range hood, the wind speed at the air outlet of the fan can reach more than 18m / s. This rapidly flowing airflow will generate certain vortices when passing through the area at the air outlet, which will lead to uneven distribution of the fan flow field, seriously hinder the passage of airflow, and increase aerodynamic noise. In addition, the flow characteristics of the airflow generated by a multi-blade centrifugal fan usually lead to the formation of large vortices in the area at the fan outlet, increasing flow resistance and worsening noise. As the pressure in the area at the range hood outlet increases, the coverage of the vortex in this area will also increase, further worsening the overall noise level of the range hood. Based on this, the embodiment of the present application provides a volute tongue, a fan assembly and a range hood, which performs a diversion and noise reduction design at the fan outlet to improve the noise problem at the fan outlet.

[0055] like Figure 1 FIG. 1 is a schematic diagram of the three-dimensional structure of a fan assembly 10 according to an embodiment of the present application. The fan assembly 10 is installed in a range hood, such as Figure 2 Figure 1 is a schematic diagram of the three-dimensional structure of a fan assembly 10 according to an embodiment of the present application, applied to a range hood 20. 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 air from the surrounding environment and discharge the air from the air duct outlet 303 of the fan assembly 10. The airflow generated by the rotation of the fan wheel is prone to generate vortices at the air duct outlet 303 and the area adjacent to the air duct outlet 303, thereby generating noise. In this embodiment of the present application, the structure at the air duct outlet 303 is designed to reduce flow resistance and noise at the air duct outlet 303.

[0056] Combine Figure 3 and Figure 4 The fan assembly 10 includes a volute 100, a volute 200 and a check valve 300. The volute 100 and the volute 200 enclose a wind wheel cavity 10a and a wind cavity outlet 10b communicating with the wind wheel cavity 10a. The check valve 300 is installed on the volute 200 corresponding to the wind cavity outlet 10b. The check valve 300 has an air duct outlet 303 communicating with the wind cavity outlet 10b. The wind wheel cavity 10a is used for installing the wind wheel 21. Of course, the volute 200 can be opened with a wind cavity according to actual conditions. Inlet 10c, the wind wheel 21 is set corresponding to the wind cavity inlet 10c. The rotation of the wind wheel 21 causes the gas in the environment of the fan assembly 10 to be sucked into the wind wheel cavity 10a from the wind cavity inlet 10c, and enters the check valve 300 from the wind cavity 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 one-way flow of the airflow from the air cavity outlet 10b to the air duct outlet 303, and prevent the airflow from flowing back into the air cavity from the check valve 300.

[0057] In this embodiment, the wind wheel 21 is a centrifugal wind wheel, which is installed in the wind wheel cavity 10a. When the wind wheel 21 is running, a negative pressure can be generated in the wind wheel cavity 10a, so that the air flow is sucked into the wind wheel cavity 10a, and then, driven by the wind wheel 21, the air flow is discharged from the air duct outlet 303. In this process, the role of the volute tongue 100 is to intercept the flow, preventing the wind wheel 21 from driving the air flow to idle in the wind wheel cavity 10a instead of going out from the air cavity outlet 10b.

[0058] like Figure 4 As shown, the volute tongue 100 includes a rotor-side curved surface 101 and an outlet-side curved surface 102, which are arranged at an angle. The rotor-side curved surface 101 is arranged toward the rotor 21, and the outlet-side curved surface 102 is arranged toward the air cavity outlet 10b. The outlet-side curved surface 102 is used to guide the airflow smoothly toward the air cavity outlet 10b. When the airflow is intercepted by the volute tongue 100 and the rotation speed of the rotor 21 is relatively fast, 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, colliding with the rotor 21 and generating a loud noise. The airflow enters the check valve 300 from the air cavity outlet 10b. During the process of passing 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 a loud noise. The airflow that is impacted and flows back to the wind wheel 21 collides with the airflow that flows toward the air duct outlet 303, generating vortices, increasing flow resistance, and interfering with the airflow that flows smoothly out of the air duct outlet 303, thereby causing more airflow to flow back to the wind wheel cavity 10a, exacerbating the generation of noise.

[0059] Among them, the airflow mainly impacts the outlet side curved surface 102 of the volute 100 and the inner wall surface of the check valve 300 adjacent to the outlet side curved surface 102, and the vortex is also mainly generated near this part of the wall surface, thereby interfering with the airflow in other areas from flowing out of the check valve 300 smoothly. In the embodiment of the present application, the check valve 300 is provided to include an air guide side curved surface 301, and the air guide side curved surface 301 is smoothly connected to the outlet side curved surface 102, and the air guide side curved surface 301 and the outlet side curved surface 102 are both concave arc surfaces, forming an avoidance space. Even when the airflow hits the air guide side curved surface 301 and the outlet side curved surface 102, causing a vortex, the vortex still exists in the avoidance space, allowing more airflow to flow smoothly from the air cavity outlet 10b to the air duct outlet 303, so that the airflow is smooth and the amount of airflow returning to the wind wheel 21 is reduced. In addition, it can also expand 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 wind guide side curved surface 301 and the wind outlet side curved surface 102, and then reduce the amount of airflow impacting the wind guide side curved surface 301 and the wind outlet side curved surface 102, thereby reducing the noise generated by the impact of the return airflow and the wind wheel 21.

[0060] In the embodiment of this application, Figure 5 As shown, the edge of the wind-out side curved surface 102 adjacent to the wind rotor side curved surface 101 (i.e., the first transition edge 1022 described below) and the edge of the wind rotor side curved surface 101 adjacent to the wind-out side curved surface 102 (i.e., the second transition edge 1011 described below) are both concave arc-shaped, and the wind rotor side curved surface 101 and the wind-out side curved surface 102 are smoothly transitioned and connected, so that the end of the volute tongue 100 forms a crescent-shaped avoidance space, and the airflow returning after colliding with the wind-out side curved surface 102 or the wind-guiding side curved surface 301 can bypass the connection between the wind rotor side curved surface 101 and the wind-out side curved surface 102, that is, enter the area between the wind rotor side curved surface 101 and the wind rotor 21 from the crescent-shaped avoidance space. Furthermore, since the velocity of the airflow returning from the middle region of the outlet side curved surface 102 is high and the velocity of the airflow returning from the edge region is low, airflow instability is likely to occur. By setting the edges of the wind wheel side curved surface 101 and the outlet side curved surface 102 adjacent to each other to be concave arcs, the velocity of the airflow returning from the middle region and the edge region of the outlet side curved surface 102 can be uniformed, allowing the returning airflow to enter the area between the wind wheel side curved surface 101 and the wind wheel 21 more smoothly, reducing the mutual interference between the returning airflow and the airflow flowing toward the air cavity outlet 10b, further reducing the generation of vortices, and thus reducing aerodynamic noise. In addition, setting the surfaces of the wind wheel side curved surface 101 and the outlet side curved surface 102 facing each other to be concave arcs can also reduce the area of ​​the outlet side curved surface 102 to a certain extent, thereby reducing the amount of returning gas that strikes the outlet side curved surface 102, thereby reducing noise.

[0061] The volute tongue 100 also includes a transition side curved surface 103, which is connected between the air outlet side curved surface 102 and the wind rotor side curved surface 101. The air outlet side curved surface 102 is smoothly connected to the wind rotor side curved surface 101 through the transition side curved surface 103, and the transition side curved surface 103 is a concave arc surface. The backflow airflow guided by the transition side curved surface 103 smoothly enters the area between the wind rotor side curved surface 101 and the wind rotor 21. The surface shape of the transition side curved surface 103 can be designed to flexibly adapt to the spacing, angle and other requirements between the air outlet side curved surface 102 and the wind rotor side curved surface 101.

[0062] The wind-out side curved surface 102 has a first transition edge 1022 facing the wind rotor side curved surface 101, and the first transition edge 1022 is in a concave arc shape. The wind rotor side curved surface 101 has a second transition edge 1011 facing the wind-out side curved surface 102, and the second transition edge 1011 is in a concave arc shape. When the snail tongue 100 includes a transition side curved surface 103, the first transition edge 1022 and the second transition edge 1011 are both connected to the transition side curved surface 103. In some embodiments, from the middle part of the first transition edge 1022 toward the edge part, the distance between the first transition edge 1022 and the second transition edge 1011 remains unchanged or at least part of the distance gradually decreases. For example, the distance between the middle part of the first transition edge 1022 and the second transition edge 1011 remains unchanged, and the distance between the edge parts gradually decreases.

[0063] Optionally, the outlet-side curved surface 102 is spaced apart from the rotor-side curved surface 101, that is, the first transition edge 1022 of the outlet-side curved surface 102 is spaced apart from the second transition edge 1011 of the rotor-side curved surface 101, so as to meet the requirement for a large spacing between the outlet-side curved surface 102 and the rotor-side curved surface 101. Optionally, the middle portions of the outlet-side curved surface 102 and the rotor-side curved surface 101 are spaced apart, and the edge portions extend toward each other and connect. In this case, the transition-side curved surface 103 can be a meniscus, so that the end of the volute tongue 100 presents a structure with two sharp corners on the edge and a concave center.

[0064] In some embodiments, the curvature of the transition side curved surface 103 remains unchanged from the wind wheel side curved surface 101 toward the wind outlet side curved surface 102, or the curvature of the transition side curved surface 103 gradually increases. Under these two surface shapes, the wind outlet side curved surface 102, the transition side curved surface 103 and the wind wheel side curved surface 101 are connected in sequence to define a fuller structure, so that the return airflow can flow more smoothly and steadily when passing through the transition side curved surface 103.

[0065] It should be noted that when the curvature of the transition side curved surface 103 gradually increases from the wind rotor side curved surface 101 toward the wind outlet side curved surface 102, the tangents at the connection between the transition side curved surface 103 and the wind outlet side curved surface 102 form an angle, and the tangents at the connection between the transition side curved surface 103 and the wind rotor side curved surface 101 form an angle; when the curvature of the transition side curved surface 103 remains unchanged from the wind rotor side curved surface 101 toward the wind outlet side curved surface 102, the tangents at the first transition edge 1022 of the transition side curved surface 103 and the wind outlet side curved surface 102 form an angle, and the tangents at the second transition edge 1011 of the wind rotor side curved surface 101 form an angle. In some other embodiments, the wind outlet side curved surface 102 is directly and smoothly connected to the wind rotor side curved surface 101, no transition side curved surface 103 is set between the wind outlet side curved surface 102 and the wind rotor side curved surface 101, and the tangents at the connection between the wind outlet side curved surface 102 and the wind rotor side curved surface 101 are collinear, and the tangents are parallel to the second direction B described below.

[0066] 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 are enclosed to form an air cavity outlet 10b, and the first outlet edge 1021 and the second outlet edge 211 are in the same plane, wherein, from the middle part of the first outlet edge 1021 toward the edge part, 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 part of the first transition edge 1022 to the plane where the first outlet edge 1021 is located is smaller, and the distance from the edge part of the first transition edge 1022 to the plane where the first outlet edge 102 is located is larger, so as to shorten the process of the return airflow passing through the middle area of ​​the outlet side curved surface 102, thereby uniformizing the flow rate of the return airflow passing through the first transition edge 1022.

[0067] Optionally, the first outlet edge 1021 is spaced apart from the first transition edge 1022; or, the middle portion of the first outlet edge 1021 is tangent to the first transition edge 1022, and the edge portion is spaced apart from the first transition edge 1022. In the above two cases, the air outlet side curved surface 102 is retained as a continuous and smooth concave arc surface in the circumference of the air cavity outlet 10b, which helps to smooth the airflow through the air outlet side curved surface 102.

[0068] The rotor side curved surface 101 has a rotor side edge 1012, and the rotor side curved surface 101 is smoothly connected to the inner wall surface of the volute 200 at the rotor side edge 1012. The second transition edge 1011 of the rotor side curved surface 101 is spaced apart from the rotor side edge 1012, so that the return airflow, after flowing through the second transition edge 1011, flows toward the inner wall surface of the volute 200 at a smoother and more appropriate angle under the guidance of the rotor side curved surface 101, thereby helping to improve the smoothness of the airflow in the entire rotor cavity 10a.

[0069] The rotor chamber 10a has a central axis H. The rotation center of the rotor 21 is located on the central axis H of the rotor chamber 10a. The chamber outlet 10b is located on one side of the central axis H in a first direction A perpendicular to the central axis H, so that the airflow within the rotor chamber 10a is discharged from the side offset from the central axis. The check valve 300 includes an air guide duct 302 connected to the chamber 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 chamber outlet 10b forms an air duct outlet 303. The airflow within the rotor chamber 10a enters the air guide duct 302 from the chamber 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 chamber outlet 10b in the direction of flowing out of the air duct outlet 303.

[0070] Along the direction from the air cavity outlet 10b toward the air duct outlet 303, at least one of the air guide side curved surface 301 and the air outlet side curved surface 102 is inclined toward the side where the rotor side curved surface 101 is located, thereby increasing the flow area of ​​the airflow, reducing the pressure on the airflow, and facilitating smooth airflow. Optionally, along the direction from the air cavity outlet 10b toward the air duct outlet 303, both the air guide side curved surface 301 and the air outlet side curved surface 102 are inclined toward the side where the rotor side curved surface 101 is located, so that when the air cavity outlet 10b is directed toward the air duct outlet 303, the pressure on the airflow passing near the air cavity outlet 10b and through the air guide duct 302 gradually decreases, further reducing the amount of backflow airflow and thereby reducing noise.

[0071] 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 toward the air duct outlet 303. As the flow area of ​​the air guide duct 302 gradually increases along the direction from the air cavity outlet 10b toward the air duct outlet 303, the pressure exerted on the airflow through the air guide duct 302 also gradually decreases, facilitating smooth airflow out of the air guide duct 302 and reducing noise.

[0072] It can be understood that based on the wind outlet characteristics of the wind wheel 21, the wall surface of the air guide duct 302 relatively arranged in the first direction A is easily impacted by the air flow. Optionally, along the direction of the air cavity outlet 10b toward the air duct outlet 303, the width of the air guide duct 302 in the first direction A gradually increases, and the width of the air guide duct 302 in the direction of the center axis H gradually increases or remains unchanged. In this way, in the direction of the air cavity outlet 10b toward the air duct outlet 303, the flow area of ​​the air guide duct 302 can be gradually increased, and the pressure can be expanded in the first direction A, so that the air flow can flow out of the air guide duct 302 more smoothly.

[0073] When the wind-guiding side curved surface 301 is inclined toward the side where the wind wheel side curved surface 101 (i.e., toward the center axis H) is located along the direction of the wind cavity outlet 10b toward the air duct outlet 303, in some embodiments, the wall surface of the air-guiding duct 302 includes the main wall surface of the air duct, and the main wall surface of the air duct and the wind-guiding side curved surface 301 are combined to form the air-guiding duct 302, and at least a portion of the main wall surface of the air duct extends along the second direction B to guide the airflow in the air-guiding duct 302 to flow out of the air-guiding duct 302, so that the air outlet of the air-guiding duct 302 is smooth, wherein the first direction A and the second direction B are perpendicular to the center axis H. Optionally, in the first direction A, the portion of the main wall of the air duct that is opposite to the wind-guiding side curved surface 301 extends along the second direction B, so that the airflow flows smoothly out of the air-guiding duct 302 in the area away from the wind-guiding side curved surface 301 in the first direction A. In this way, a vortex zone is formed in the area adjacent to the wind-guiding side curved surface 301, and a static flow zone is formed in the area away from the wind-guiding side curved surface 301, thereby reducing the airflow interference between the two areas.

[0074] The shapes of the main wall of the air duct and the wind-guiding side curved surface 301 determine the shape of the air duct outlet 303. The shape of the air duct outlet 303 can be similar to or different from the shape of the air cavity outlet 10b. Figure 6 As shown, the check valve 300 may include multiple plates 310, which are spliced ​​together to form an air guide duct 302. One of the multiple plates 310 has an air guide side curved surface 301, and the surfaces of the remaining plates 310 are spliced ​​together to form the main wall of the duct, so as to form an air guide duct 302 with a smooth wall according to the shapes of the duct outlet 303 and the air cavity outlet 10b.

[0075] In some embodiments, the air duct outlet 303 of the check valve 300 is circular, so that the portion of the check valve 300 with the air duct outlet 303 can be connected to other structures. Optionally, the check valve 300 also includes a valve body interface 320. The valve body interface 320 is annular and connected to the portion of the multiple plates 310 that defines the air duct outlet 303. The valve body interface 320 and the multiple plates 310 are integrally provided, and the multiple plates 310 can be connected to other structures through the valve body interface 320.

[0076] In some embodiments, as Figure 7 As shown, the air outlet curved surface 102 of the volute tongue 100 has a first outlet edge 1021, and the volute 200 has a second outlet edge 211. The first outlet edge 1021 and the second outlet edge 211 are in the same plane and together form the air cavity outlet 10b. The second outlet edge 211 can be a straight line, a curve, or include a polyline connected at an angle. When the second outlet edge 211 is a straight line, the shape of the air cavity outlet 10b can be a semicircle, a semi-ellipse, etc. When the second outlet edge 211 is a curve, the shape of the air cavity outlet 10b can be a meniscus, a spindle, etc. When the second outlet edge 211 includes a polyline connected at an angle, the second outlet edge 211 can include two, three, four, or other number of line segments at an angle, and the polyline is connected end to end with the first outlet edge 1021 to enclose the air cavity outlet 10b. When the air cavity outlet 10 b is in the above-mentioned shape, the air duct outlet 303 can be set to be circular, and the air guide duct 302 can be formed by splicing and enclosing multiple plates 310 .

[0077] Optionally, when the second outlet edge 211 includes three lines, one of the lines is the first edge 201, the first edge 201 extends in a direction parallel to the center axis H, and is arranged opposite to the first outlet edge 1021 in the first direction A, and the remaining two lines are the second edges 202, both of the second edges 202 extend in the first direction A and are parallel, and each second edge 202 is connected between the first edge 201 and the first outlet edge 1021. In this case, the check valve 300 can be configured to include four plates 310, one of which is disposed corresponding to the first outlet edge 1021 and has an air-guiding curved surface 301. The remaining three plates 310 are disposed one-to-one 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 toward the air duct outlet 303, the three plates 310 gradually bend and, together with the plate 310 having the air-guiding curved surface 301, form a circular air duct outlet 303. The middle portion of the plate 310 corresponding to the first edge 201 extends consistently along the second direction B, thereby directing a portion of the fluid within the air duct 302 to flow out of the air duct 302 along the second direction B.

[0078] In some embodiments, the portion of the volute 200 defining the air cavity outlet 10b includes a tail portion 222. The tail portion 222 is disposed opposite the outlet-side curved surface 102 in a first direction A. Airflow within the rotor cavity 10a that passes through the tail portion 222 further enters the air guide duct 302 and travels along the air cavity outlet 10b toward the duct outlet 303. The tail portion 222 is inclined toward the side where the volute tongue 100 is located. That is, both the tail portion 222 and the outlet-side curved surface 102 are inclined toward the side where the central axis H is located, thereby directing the airflow out of the air cavity outlet 10b. The volute 200 further includes a transition portion 223 connected to the end of the tail portion 222 away from the air cavity outlet 10b. The transition portion 223 extends along a second direction B to direct the airflow toward the tail portion 222.

[0079] 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 a 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 wind wheel 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 together form an air cavity outlet 10b. At this time, the second outlet edge 211 is formed by the edges of the tail 222 and the two volute side plates 210 facing the check valve 300. The edge of the tail 222 facing the check valve 300 forms a first edge 201, and the first edge 201 can be a straight line or a curve. The edge of the volute side plate 210 facing the check valve 300 forms a second edge 202, and the second edge 202 can be a straight line or a curve.

[0080] The volute tongue 100 includes a volute tongue body 110, and the volute tongue body 110 includes a wind wheel side wall and an air outlet side wall. The wind wheel side wall has a wind wheel side curved surface 101, and the wind wheel side wall is arranged in the wind wheel cavity 10a. The air outlet side wall has an air outlet side curved surface 102, and the air outlet side wall and the tail portion 222 of the volute enclosure are arranged opposite to each other in the first direction A. The volute 200 has a first matching portion, and the volute tongue 100 also includes a second matching portion 120. The second matching portion 120 is connected to the air outlet side wall, and the first matching portion and the second matching portion 120 are spliced ​​to form a docking portion. The docking portion is plugged into and matched with 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 with the wall surfaces of the first matching portion and the second matching portion 120 respectively, sealing the gaps among the first matching portion, the second matching portion 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 air outlet side curved surface 102 and the air guide side curved surface 301 from being poorly aligned and causing negative interference to the flow of air.

[0081] In some embodiments, the first mating portion is connected to the two volute side plates 210 and the tail portion 222, so that the first mating portion and the second mating portion 120 are enclosed to form a circumferentially smooth and complete docking portion, and the docking portion is smoothly plugged into the check valve 300 and has better sealing performance.

[0082] In some embodiments, the portion of the second mating portion 120 connected to the volute tongue body 110 is in a concave arc shape similar to the first outlet edge 1021. The portion of the second mating portion 120 connected to the volute tongue body 110 and the first mating portion both extend toward a side away from the air cavity outlet 10b so as to be plugged into and mated with the check valve 300, thereby facilitating alignment of the air outlet side curved surface 102 and the air guide side curved surface 301.

[0083] In some embodiments, the first mating portion includes a first flange 231 and two second flanges 232. The first flange 231 is connected to the first edge 201 of the tail portion 222 and is integrally formed with the tail portion 222. Each second flange 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 portion 120 is disposed opposite the first flange 231 in a direction perpendicular to the side-by-side arrangement of the two volute side plates 210 (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 portion 120 are plugged into and fitted with the check valve 300 to form a circumferentially closed structure, achieving a good sealing effect.

[0084] In some embodiments, the first matching portion and the second matching portion 120 each have a first step 20a, and the check valve 300 extends into the first step 20a and fits with the step surface of the first step 20a. Figure 8 As shown, the first mating portion may also include a third flange 233, which is connected to the portion of the enclosure body 221 facing the tail portion 222. The first flange 231, the two second flanges 232 and the third flange 233 are combined to form a docking opening. The second mating portion 120 is arranged in the docking opening, and the first steps 20a of the second mating portion 120 and the first mating portion are spliced ​​to form a step groove for the check valve 300 to be plugged in, thereby limiting 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-guiding side curved surface 301 of the check valve 300 is directly docked with the air-out side curved surface 102 of the volute tongue 100 to achieve a smooth transition connection.

[0085] Optionally, when the first mating portion includes a first flange 231, two second flanges 232 and a third flange 233, the volute 200 also includes a socket 240, the socket 240 has a socket opening, the first flange 231, the two second flanges 232 and the third flange 233 extend into the socket opening, and are fixedly connected to the socket 240 by welding, clamping, etc. to limit the relative positions of the first flange 231, the two second flanges 232 and the third flange 233, and the check valve 300 is detachably mounted on the socket 240. At this time, the second matching portion 120 is arranged at the docking opening, and the second matching portion 120 extends along the first direction A and to the side away from the first flange 231 to avoid the air cavity outlet 10b, and extends to fit with the wall surface of the two second flanges 232 and the third flange 233, blocking the area between the two second flanges 232 and the third flange 233, making the structure compact, improving the installation stability of the snail tongue 100, and preventing the snail tongue 100 from deformation.

[0086] In some embodiments, the check valve 300 has a second step, and the second matching portion 120 and the first matching portion extend into the second step and fit with the step surface of the second step. Figure 9 As shown, the first mating portion includes only the first flange 231 and two second flanges 232. The second mating portion 120, the first flange 231, and the two second flanges 232 collectively extend into the second step of the check valve 300 and abut against the 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 point, the air-guiding curved surface 301 of the check valve 300 and the air-outlet curved surface 102 of the volute tongue 100 are butted against each other through the wall of the second mating portion 120, achieving a smooth transition connection.

[0087] Optionally, when the first fitting part only includes a first flange 231 and two second flanges 232, the volute 200 also includes a socket 240, the socket 240 has a socket opening, the second fitting part 120, the first flange 231 and the two second flanges 232 extend into the socket opening, and are fixedly connected to the socket 240 by welding, clamping, etc. to limit the relative positions of the second fitting part 120, the first flange 231 and the two second flanges 232, and the check valve 300 is detachably mounted on the socket 240. At this time, a portion of the second matching portion 120 extends along the second direction B to extend into the second step of the check valve 300, and another portion of the second matching portion 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 with the wall surface of the socket opening defined by the socket 240. The structure is compact, which helps to improve the installation stability of the volute tongue 100 and prevent the volute tongue 100 from deformation.

[0088] The socket 240 includes a socket body 241 and a socket flange 242. The socket body 241 surrounds the first and second mating portions 120, and the three are fixedly connected. The socket body 241 defines the relative position between the first and second mating portions 120, preventing deformation of the first and second mating portions 120 that could affect sealing. The socket flange 242 is connected to the socket body 241 at an angle. The socket flange 242 and the socket body 241 can be integrally formed to enhance the structural strength of the socket 240.

[0089] The sleeve flange 242 is flat, wherein the check valve 300 fits with the portion of the second fitting portion 120 that is not inserted into the check valve 300, that is, the check valve 300 fits with the portion of the second fitting portion 120 extending along the first direction A and toward the side away from the first flange 231, and the check valve 300 also fits with the sleeve flange 242, thereby increasing the contact area between the check valve 300 and the second fitting portion 120 and the sleeve flange 242 respectively, further improving the sealing effect, and improving the installation stability.

[0090] The volute tongue body 110 is arranged in the internal space of the volute 200, wherein the volute tongue body 110 is fitted with the inner wall surface of the panel body 221 so that the wind rotor side curved surface 101 and the inner wall surface of the panel body 221 are smoothly transitioned and connected. The surface of the volute tongue body 110 facing away from the wind rotor side curved surface 101 and the wind outlet side curved surface 102 forms a leeward space. In some embodiments, such as Figure 10 As shown, the volute tongue further includes at least one mounting rib 130, which is provided in the leeward space and is integrally formed with the volute tongue body 110. The mounting rib 130 avoids the second mating portion 120 and is detachably mounted on the shroud body 221 of the volute 200, so as to improve the fit between the volute tongue body 110 and the inner wall surface of the shroud body 221, thereby achieving a smooth transition between the rotor side curved surface 101 and the inner wall surface of the shroud body 221. The surface of the volute tongue body 110 also fits against the wall surface of the volute 200 to seal the leeward space, preventing the airflow in the rotor cavity 10a and the leeward space from flowing through the gap between the volute tongue body 110 and the volute 200.

[0091] In some embodiments, the volute tongue body 110 also includes two supporting side walls 114, which are arranged side by side. Each supporting side wall 114 is respectively connected to the air outlet side wall and the wind wheel side wall to improve the structural strength of the volute tongue 100, and the surface of each supporting side wall 114 is in contact with the inner wall surface of the volute 200 to prevent air leakage from the gap between the volute tongue 100 and the volute 200.

[0092] In some embodiments, the volute tongue body 110 further includes a transition sidewall having a transition side curved surface 103. The transition sidewall is connected between the rotor sidewall and the outlet sidewall. The transition sidewall, the rotor sidewall, the outlet sidewall, and the surfaces of the two supporting sidewalls 114 facing away from the rotor cavity 10a collectively form a leeward space. When the volute tongue 100 further includes a second mating portion 120, the second mating portion 120 is integrally formed with the rotor sidewall.

[0093] The present embodiment further provides a range hood 20, comprising a housing 22, a fan, and the fan assembly 10 described above. The specific structure of the fan assembly 10 is similar to that of the above embodiment. The fan assembly 10 is mounted on the housing 22, which has an oil suction port facing the stove. The fan includes a fan wheel 21, which rotates to draw in oil smoke from the oil suction port and deliver it to the air duct outlet 303 for discharge. The fan wheel 21 can be a centrifugal fan wheel and is mounted 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 about by the technical solutions of the above embodiments, which will not be detailed here.

[0094] The following experimental comparison is conducted between the air outlet effects of a fan assembly in the related art applied to a range hood 20 and the fan assembly 10 in the embodiment of the present application applied to the range hood 20. The difference between the fan assembly in the related art and the fan assembly 10 in the embodiment of the present application is that the air outlet side curved surface 102 of the volute 100 and the air guide side curved surface 301 of the check valve 300 are both replaced with planes, and the remaining structure is the same as that of the fan assembly 10 in the embodiment of the present application.

[0095] Figure 11 Figure (a) is a simulation diagram of turbulent kinetic energy distribution of the fan assembly 10 of the embodiment of the present application applied to the range hood 20, Figure 11 Figure (b) is a simulation diagram of the turbulent kinetic energy distribution of the fan assembly 10 of the related art applied to the range hood 20. Figure 11 As can be seen from Figures (a) and (b) in the figure, the fan assembly 10 in the embodiment of the present application greatly reduces the area where vortices exist and improves the uniformity of the air flow at the air cavity outlet 10b.

[0096] Figure 12 The noise test distribution diagram of the fan assembly 10 in the embodiment of the present application and the related art applied to the range hood 20 is shown in FIG. Figure 12 It can be seen that the fan assembly 10 of the embodiment of the present application can effectively reduce the working noise of the range hood 20. Compared with the fan assembly in the related art, the working noise of the fan assembly 10 of the embodiment of the present application is reduced by about 1dB(A), which significantly improves the noise quality of the kitchen.

[0097] The same or similar numbers in the drawings of this embodiment correspond to the same or similar parts; in the description of this application, it should be understood that if the terms "upper", "lower", "left", "right", etc. indicate an orientation or position relationship, they are based on the orientation or position relationship shown in the drawings. This is only for the convenience of describing this application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, the terms describing the position relationship in the drawings are only used for illustrative purposes and cannot be understood as a limitation on this patent. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0098] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present application should be included in the scope of protection of the present application.

Claims

1. A snail tongue, characterized in that: Mounted on a volute of a fan assembly, the volute tongue comprises: The wind wheel side curved surface is arranged toward the wind wheel of the wind turbine assembly; The air outlet side curved surface is arranged toward the air cavity outlet of the fan assembly, and the air outlet side curved surface is arranged at an angle to the wind wheel side curved surface, so as to intercept the airflow in the internal space of the volute where the wind wheel is located and make the airflow flow out from the air cavity outlet; The wind outlet side curved surface is a concave arc surface, the edges of the wind outlet side curved surface and the wind wheel side curved surface adjacent to each other are both concave arc-shaped, and the wind outlet side curved surface and the wind wheel side curved surface are smoothly transitioned and connected.

2. The snail tongue according to claim 1, characterized in that The volute tongue further includes a transition side curved surface, through which the wind wheel side curved surface is smoothly transitionally connected to the wind outlet side curved surface, and the transition side curved surface is a concave arc surface.

3. The snail tongue according to claim 2, characterized in that The wind outlet side curved surface and the wind wheel side curved surface are spaced apart; or, The middle parts of the wind outlet side curved surface and the wind wheel side curved surface are spaced apart, and the edge parts thereof extend toward each other and are connected.

4. The snail tongue according to claim 2, characterized in that From the wind wheel side curved surface toward the wind outlet side curved surface, the curvature of the transition side curved surface remains unchanged or gradually increases.

5. The snail tongue according to claim 1, characterized in that The wind outlet side curved surface is directly and smoothly transitionally connected to the wind wheel side curved surface.

6. The snail tongue according to claim 1, characterized in that The wind outlet side curved surface and the wind wheel side curved surface are arranged in axisymmetry with respect to the same plane.

7. The snail tongue according to claim 1, characterized in that The wind outlet side curved surface has a first outlet edge away from the wind wheel side curved surface, and the first outlet edge and the second outlet edge of the volute are combined to form the wind cavity outlet; The wind-out side curved surface further has a first transition edge adjacent to the wind wheel side curved surface, and the first transition edge is in a concave arc shape; From the middle portion of the first outlet edge toward the edge portion, the distance from the first transition edge to the first outlet edge gradually increases.

8. The snail tongue according to claim 7, characterized in that The first outlet edge is spaced apart from the first transition edge; or, A middle portion of the first outlet edge is tangent to the first transition edge, and an edge portion is spaced apart from the first transition edge.

9. The snail tongue according to claim 1, characterized in that The wind rotor side curved surface has a wind rotor side edge away from the wind outlet side curved surface, and the wind rotor side curved surface is smoothly transitionally connected to the inner wall surface of the volute at the wind rotor side edge; The wind wheel side curved surface further has a second transition edge adjacent to the wind outlet side curved surface, and the second transition edge is in a concave arc shape; The second transition edge is spaced apart from the side edge of the wind wheel.

10. The snail tongue according to claim 1, characterized in that The snail tongue comprises: The volute tongue body has the wind rotor side curved surface and the wind outlet side curved surface, and a leeward space is formed on the surface of the volute tongue body facing away from the wind rotor side curved surface and the wind outlet side curved surface; and At least one mounting rib is provided in the leeward space and is integrally formed with the volute tongue body. The mounting rib is detachably mounted on the volute.

11. The snail tongue according to claim 10, characterized in that The snail tongue body comprises: An air outlet side wall having the air outlet side curved surface; The wind wheel side wall has the wind wheel side curved surface; Two supporting side walls are arranged side by side, each supporting side wall is connected to the air outlet side wall and the wind wheel side wall respectively, and the surface of each supporting side wall is used to fit with the inner wall surface of the volute.

12. A fan assembly, characterized in that: include: volute; The volute tongue according to any one of claims 1 to 11, wherein the volute tongue and the volute casing enclose a wind wheel cavity and a wind cavity outlet communicating with the wind wheel cavity; and The wind wheel is arranged in the wind wheel cavity and installed on the volute.

13. The fan assembly according to claim 12, characterized in that: The fan assembly further includes a check valve, which is installed on the volute corresponding to the air cavity outlet. The check valve includes an air-guiding side curved surface, which is smoothly transitioned to the air-outlet side curved surface.

14. A range hood, characterized in that: include: shell; and The fan assembly according to any one of claims 12 to 13, wherein the fan assembly is installed in the internal space of the housing.

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