Range hood volute, fan and range hood

Abstract

The invention discloses a range hood volute, a fan and a range hood, the range hood volute comprises a shell, the shell comprises a first end plate, a second end plate and a peripheral side plate, and the second end plate and the first end plate are oppositely arranged at an interval; the peripheral side plate is located between the first end plate and the second end plate, arc-shaped transition parts are arranged at the two opposite ends of the peripheral side plate, the first end plate and the second end plate are connected with the peripheral side plate through the arc-shaped transition parts, an air cavity and an air outlet are defined by the first end plate, the peripheral side plate, the arc-shaped transition parts and the second end plate, and the air outlet communicates with the air cavity; an air inlet communicated with the air cavity is formed in the first end plate and / or the second end plate; the outer contour of the orthographic projection of the peripheral side plate on the first plane comprises a first arc line, a receding line and a second arc line which are sequentially arranged and connected along the peripheral side of the peripheral side plate, the first plane is perpendicular to the axis of the air inlet, and the curvature radius of each position on the receding line is larger than that of each position on the first arc line and the second arc line; according to the embodiment, vortexes in the volute of the range hood can be reduced.

Description

Technical Field

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

[0002] Range hoods have become essential appliances in family kitchens. They absorb cooking fumes and effectively exhaust them outdoors, freeing the kitchen from the nuisance of smoke. The volute of a range hood collects the fumes entering from the impeller and exhausts them through its outlet, functioning as a collector and diffuser. However, in some technologies, the front and back panels of the volute are directly connected to the side panels. As the fumes flow through the volute, some vortices form at the junctions of the front and side panels, and the back and side panels, causing problems such as reduced airflow and increased noise. Summary of the Invention

[0003] This application provides a range hood volute, a fan, and a range hood, which can reduce eddies in the range hood volute.

[0004] In a first aspect, embodiments of this application provide a range hood volute, including a housing, the housing comprising:

[0005] First end plate;

[0006] The second end plate is disposed at a distance from the first end plate;

[0007] A peripheral side plate is located between the first end plate and the second end plate. Both ends of the peripheral side plate are provided with arc-shaped transition portions. The first end of the peripheral side plate is connected to the first end plate through one of the arc-shaped transition portions, and the second end of the peripheral side plate is connected to the second end plate through another arc-shaped transition portion. The first end plate, the peripheral side plate, the arc-shaped transition portions, and the second end plate together form an air cavity and an air outlet. The air outlet communicates with the air cavity. An air inlet communicating with the air cavity is opened on the first end plate and / or the second end plate.

[0008] The outer contour of the peripheral side plate projected onto the first plane includes a first arc, a clearance line, and a second arc arranged sequentially and connected along the periphery of the peripheral side plate. The first plane is perpendicular to the axis of the air inlet, and the radius of curvature at each point on the clearance line is greater than the radius of curvature at each point on the first arc and the second arc.

[0009] In some embodiments of this application, the radius of curvature at each point on the second arc is greater than the radius of curvature at each point on the first arc, and the radius of curvature at each point on the avoidance line is greater than the radius of curvature at each point on the second arc.

[0010] In some embodiments of this application, the overall shape of the air outlet is circular.

[0011] In some embodiments of this application, the distance between the first end plate and the second end plate is B, the arc-shaped transition portion is arc-shaped, and the radius of the arc-shaped transition portion is less than or equal to 0.5B.

[0012] In some embodiments of this application, the air outlet has an orthographic projection area on the first plane, the first end of the first arc extends to the orthographic projection area of ​​the air outlet, and the second end of the first arc is connected to the avoidance line; the first end of the second arc is connected to the avoidance line, and the second end of the second arc extends to the orthographic projection area of ​​the air outlet.

[0013] In some embodiments of this application, the air outlet has an orthographic projection area on the first plane; the outer contour of the orthographic projection of the peripheral side plate on the first plane includes two oppositely arranged avoidance lines, the two avoidance lines being located on both sides of the orthographic projection area of ​​the air outlet.

[0014] In some embodiments of this application, the maximum length of the first end plate and the second end plate along the first direction is H, and the maximum length of the first end plate and the second end plate along the second direction is W, where H < 600 mm and W < 600 mm; wherein, the first direction is parallel to the first plane and the axial direction of the air outlet, the second direction is perpendicular to the first direction, and the second direction is parallel to the first plane.

[0015] In some embodiments of this application, the overall shape of the air outlet is circular, and the diameter of the air outlet is less than 0.5W.

[0016] In some embodiments of this application, the orthographic projection of the centerline of the air inlet onto the first plane is point O. The first plane has a first axis, a first reference point, and a second reference point. The first axis is parallel to the second direction and intersects with point O. The first reference point and the second reference point are symmetrically distributed about the first axis, and the distance between the first reference point and the second reference point is d, where 0.25H≤d≤0.5H.

[0017] The first axis and the avoidance line have a first intersection point. In the second direction, the shortest distance from the first intersection point to the straight line passing through the first reference point and the second reference point is a, where 0.2W≤a≤0.5W.

[0018] The distance between the flow point on the avoidance line and the first reference point is r1, and the distance between the flow point and the second reference point is r2, (0.25d). 2≤r²×r²≤(0.36d) 2 .

[0019] In some embodiments of this application, a guide ring is provided at the air inlet, the guide ring is provided in an arc shape facing away from the air suction cavity, and / or, a guide structure is provided on the side of the guide ring facing the axis of the air inlet.

[0020] In some embodiments of this application, the air inlet is provided on both the first end plate and the second end plate. A guide ring is provided at the air inlet on the first end plate, and a limit bracket is provided at the air inlet on the second end plate.

[0021] Secondly, embodiments of this application provide a fan, including a fan wheel assembly and a flue gas volute as described in any of the above embodiments, wherein the fan wheel assembly is disposed in the housing of the flue gas volute.

[0022] Thirdly, this application provides a range hood, including a main body and a fan as described in the above embodiments. The main body is provided with a flue and an exhaust port communicating with the flue. The flue is connected to the air inlet. The fan is disposed inside the main body. The fan draws smoke from the exhaust port into the flue and the air inlet, and discharges the smoke from the exhaust port into the range hood.

[0023] In some embodiments of this application, the range hood further includes a check valve connected to the main body, the check valve being located at the air outlet, and the check valve being used to allow the smoke in the range hood to be discharged from the air outlet.

[0024] Based on the range hood volute, fan, and range hood in this embodiment, the outer contour of the side portion of the range hood volute projected onto the first plane is set as an avoidance line shape. This reduces the side protrusion height of the range hood volute, thereby reducing its volume and improving the flow of smoke at the avoidance surface. This reduces backflow and eddy currents of smoke at the avoidance surface, lowering the noise generated by the range hood volute during smoke extraction. Simultaneously, the peripheral side plates are connected to the first and second end plates using a curved transition, further reducing backflow and eddy currents of smoke inside the range hood volute and further reducing noise. Attached Figure Description

[0025] 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.

[0026] Figure 1 This is a first-view structural diagram of the volute casing of a smoke machine in one embodiment of this application;

[0027] Figure 2 This is a second-view structural diagram of the flue casing in one embodiment of this application;

[0028] Figure 3 This is a schematic cross-sectional view of the volute casing of a smoke machine in one embodiment of this application;

[0029] Figure 4 This is a schematic cross-sectional view of the volute casing of a smoke machine in one embodiment of this application;

[0030] Figure 5 This is a third-view structural diagram of the volute casing of a smoke machine in one embodiment of this application;

[0031] Figure 6 This is a schematic projection of the flue casing of the smoke machine onto a first plane in one embodiment of this application;

[0032] Figure 7 For Cassini's oval line;

[0033] Figure 8 The table presents a comparison curve of the airflow at the outlet of the volute casing of the smoke hood in this application and a comparison table of noise test results with the volute casings of smoke hoods in related technologies.

[0034] Figure 9 This is a schematic diagram of the wind turbine assembly in one embodiment of this application;

[0035] Figure 10 This is a schematic diagram of the structure of the first blade in one embodiment of this application and a projection view of the first blade on a first reference plane;

[0036] Figure 11 This is a schematic diagram of the structure of a range hood in one embodiment of this application.

[0037] Figure label:

[0038] 100. Range hood volute; 10. Housing; 101. First end plate; 102. Second end plate; 103. Peripheral side plate; 1031. First arc surface; 103a. First arc line; 1032. Clearance surface; 103b. Clearance line; 1033. Second arc surface; 103c. Second arc line; 104. Arc-shaped transition section; 105. Air inlet; 106. Air outlet; 107. Air cavity; 24. Guide ring; 25. Guide structure; 12. Limiting bracket;

[0039] 1000, Wind turbine; 200, Wind turbine assembly; 201, First frame; 2011, Air intake space; 202, First blade; 200, Wind turbine assembly; 201, First frame; 2011, Air intake space; 202, First blade; 202a, Guide surface; 202a1, Guide slope; 2021, Leading edge surface; 2021a, Leading edge line; 2022, Trailing edge surface; 2022a, Trailing edge line; 2023, First end face; 2024, Second end face; 2025, Pressure surface; 2025a, Pressure line;

[0040] 2000, Range hood; 300, Main body; 301, Exhaust port; 11, Mounting bracket; 13, Check valve; 14, Top plate;

[0041] XX, first direction; YY, second direction; M, first axis. Detailed Implementation

[0042] To more clearly illustrate the technical solutions in the embodiments of this application or related technologies, a clear and complete description will be provided below with reference to the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0043] In related technologies, the front and back plates of the volute are generally directly connected to the side plates. When the flue gas flows in the volute, some of the flue gas will generate eddies at the connection between the front and side plates and the back and side plates of the volute, which will cause problems such as reduced air volume and increased noise in the range hood.

[0044] Regarding the above situation, firstly, please refer to [link / reference needed]. Figure 1 This application proposes a range hood volute 100 for installation in a range hood 2000, wherein a fan 1000 for absorbing smoke can be installed in the range hood volute 100.

[0045] like Figures 1-3As shown, the range hood volute 100 includes a housing 10, which includes a first end plate 101, a second end plate 102, and a peripheral side plate 103. The first end plate 101 and the second end plate 102 are spaced apart from each other, and the peripheral side plate 103 is located between the first end plate 101 and the second end plate 102. Both ends of the peripheral side plate 103 are provided with arc-shaped transition portions 104. The first end of the peripheral side plate 103 is connected to the first end plate 101 through an arc-shaped transition portion 104, and the second end of the peripheral side plate 103 is connected to the second end plate 102 through another arc-shaped transition portion 104. The first end plate 101, the peripheral side plate 103, the arc-shaped transition portion 104, and the second end plate 102 together form a wind cavity 107 and an air outlet 106. The air outlet 106 communicates with the wind cavity 107. An air inlet 105 communicating with the wind cavity 107 is provided on the first end plate 101 and / or the second end plate 102.

[0046] Specifically, such as Figures 3-4 As shown, one arc-shaped transition section 104 connects the two ends of the peripheral side plate 103 to the first end plate 101, and the other arc-shaped transition section 104 connects the two ends of the peripheral side plate 103 to the second end plate 102. This allows both end plates to be connected to the peripheral side plate 103 using an arc-shaped transition. An arc-shaped transition differs from a right-angle transition. For example, a right-angle design in the volute can easily cause backflow and vortex phenomena in the flue gas inside the volute, resulting in reduced fume extraction efficiency and increased noise. The arc-shaped transition in this application ensures that there are no sharp corners at the connection point between the two surfaces. The arc-shaped transition better conforms to the airflow pattern, avoiding sharp corners, reducing airflow loss, and improving efficiency. Therefore, this application uses arc-shaped transition sections 104 to connect the end plates and peripheral side plates 103, thereby reducing flue gas backflow and vortex phenomena inside the volute 100 of the range hood. The arc surface of the arc transition part 104 can be in the shape of a circular arc, an elliptical arc, or a splicing of multiple circular arc surfaces; no specific restrictions are imposed here.

[0047] Optionally, the volute 100 of the range hood may have an air inlet 105 communicating with the air cavity 107, that is, the air intake method of the volute 100 of the range hood is single-sided air intake; or, both the first end plate 101 and the second end plate 102 may have air inlets 105 communicating with the air cavity 107, that is, the air intake method of the volute 100 of the range hood is double-sided air intake, and the flue gas can be drawn into the air cavity 107 through the air inlet 105 on the volute 100 under the action of the fan 1000, and then discharged from the air outlet 106.

[0048] like Figures 5-6 As shown, the outer contour of the peripheral side plate 103 projected onto the first plane includes a first arc line 103a, a clearance line 103b, and a second arc line 103c arranged sequentially and connected along the circumferential direction of the peripheral side plate 103. For example, as shown... Figure 6As shown, the first arc 103a and the second arc 103c are dashed lines, while the avoidance line 103b is a solid line. The first plane is perpendicular to the axis of the air inlet 105, that is, the first plane is parallel to the side planes of the first end plate 101 and the second end plate 102. The radius of curvature at all points on the avoidance line 103b is greater than the radius of curvature at all points on the first arc 103a and the second arc 103c. It can be understood that the radius of curvature at all points on the avoidance line 103b is the largest compared to the first arc 103a and the second arc 103c. In other words, the curvature of the avoidance line 103b is less than that of the first arc 103a and the second arc 103c, and the avoidance line 103b is smoother overall (more approximately a straight line).

[0049] Specifically, the outer peripheral side surface of the peripheral side plate 103 includes a first arc surface 1031, a clearance surface 1032, and a second arc surface 1033 arranged sequentially and connected along the peripheral direction of the peripheral side plate 103. The two ends of the clearance surface 1032 are connected to the first arc surface 1031 and the second arc surface 1033, respectively. The orthographic projection of the first arc surface 1031 onto the first plane corresponds to the first arc line 103a; the orthographic projection of the clearance surface 1032 onto the first plane corresponds to the clearance line 103b; and the orthographic projection of the second arc surface 1033 onto the first plane corresponds to the second arc line 103c. The clearance line 103b... b is a curved transition line between the first arc 103a and the second arc 103c. That is to say, the transition between the avoidance surface 1032 and the first arc surface 1031 and the second arc surface 1033 is a curved surface transition. Compared with the transition between two planes at an angle, the curved surface transition can prevent the two surfaces from having sharp corners at the connection. The curved surface transition is more in line with the flow pattern of airflow, which can improve the uniformity of flue gas flow, thereby reducing the backflow and eddy phenomenon of flue gas caused by sharp corners (such as right angles, acute angles or obtuse angles), thereby increasing the air volume of the air outlet 106 and reducing aerodynamic noise.

[0050] It should be noted that the range hood housing 100 is installed within the installation space of the range hood 2000. Therefore, the volume of the range hood housing 100 is limited by the installation space of the range hood 2000. This is because the radius of curvature at various points on the clearance line 103b is the largest compared to the first arc 103a and the second arc 103c. Therefore, the clearance line 103b is smoother than the first arc 103a and the second arc 103c. If the side of the range hood housing 100 exceeds the installation space... In this area, the outer contour of the side portion of the range hood volute 100 projected onto the first plane can be set as the shape of the avoidance line 103b. This reduces the side protrusion height of the range hood volute 100, thereby reducing its volume. Simultaneously, it improves the flow of smoke at the avoidance surface 1032 of the range hood volute 100, reducing backflow and eddy currents, and lowering the noise generated by the range hood volute 100 during smoke extraction. Furthermore, the peripheral side plate 103 is connected to the first end plate 101 and the second end plate 102 using a curved transition, further reducing backflow and eddy currents inside the range hood volute 100, increasing the airflow at the outlet 106, and reducing noise.

[0051] Furthermore, in some embodiments, the radius of curvature at various points on the second arc 103c is greater than the radius of curvature at various points on the first arc 103a. Therefore, the curvature of the second arc 103c is less than that of the first arc 103a, and the second arc 103c is smoother overall than the first arc 103a. Simultaneously, the radius of curvature at various points on the avoidance line 103b is greater than that of the second arc 103c. In other words, the radius of curvature of the avoidance line 103b is the largest compared to both the first and second arcs 103a and 103c. This means that the curvature of the avoidance line 103b is less than that of both the first and second arcs 103a and 103c, and the avoidance line 103b is smoother overall (more closely approximating a straight line).

[0052] Optionally, such as Figure 5 As shown, the air outlet 106 has an orthographic projection area on the first plane. The first end of the first arc 103a extends to the orthographic projection area of ​​the air outlet 106, and the second end of the first arc 103a is connected to the avoidance line 103b. The first end of the second arc 103c is connected to the avoidance line 103b, and the second end of the second arc 103c extends to the orthographic projection area of ​​the air outlet 106.

[0053] It is easy to understand that the first end of the first arc 103a and the second end of the second arc 103c form the orthographic projection area of ​​the air outlet 106 on the first plane. That is to say, the air outlet 106 of the range hood volute 100 is formed by the first end plate 101, the second end plate 102, the first arc surface 1031, and the second arc surface 1033. Since the peripheral side plate 103 is connected to the first end plate 101 and the second end plate 102 by an arc-shaped transition part 104, when the overall shape of the air outlet 106 is circular, unnecessary sharp corners at the air outlet 106 can be avoided, thereby reducing the phenomenon of smoke flow separation. The overall shape of the air outlet 106 can also be elliptical, semi-circular, or semi-elliptical, etc., and no specific limitation is made here.

[0054] Optionally, such as Figure 6 As shown, the outer contour of the peripheral side plate 103 projected onto the first plane includes two oppositely arranged avoidance lines 103b, which are located on both sides of the projected area of ​​the air outlet 106.

[0055] It should be noted that the outer peripheral side of the peripheral side plate 103 includes a first arc surface 1031, a first clearance surface 1032, a second arc surface 1033, and a second clearance surface 1032 arranged sequentially and connected along the peripheral direction of the peripheral side plate 103. The orthographic projection of the first arc surface 1031 on the first plane corresponds to the first arc line 103a, the orthographic projection of the first clearance surface 1032 on the first plane corresponds to the clearance line 103b, the orthographic projection of the second arc surface 1033 on the first plane corresponds to the second arc line 103c, and the shape of the orthographic projection of the second clearance surface 1032 on the first plane is the same as the shape of the clearance line 103b. The first clearance surface 1032 and the second clearance surface 1032 are located on both sides of the air outlet 106, that is, the air outlet 106 of the range hood volute 100 is formed by the first end plate 101, the second end plate 102, the first arc surface 1031, and the second clearance surface 1032. Figures 1-2 As shown, the addition of the clearance surface 1032 on the range hood volute 100 reduces the volume of the range hood volute 100 while further improving the flow of flue gas at the clearance surface 1032, reducing the backflow and eddy current phenomenon of flue gas at the clearance surface 1032, increasing the exhaust volume of the air outlet 106, and reducing the noise generated by the range hood volute 100 when smoking.

[0056] In some embodiments of this application, the distance between the first end plate 101 and the second end plate 102 is B, the arc transition portion 104 is arc-shaped, and the radius of the arc transition portion 104 is less than or equal to 0.5B. By limiting the size of the arc transition portion 104, the flue gas can flow more evenly in the air cavity 107 of the flue gas volute 100, thereby reducing aerodynamic noise.

[0057] Please see Figure 5 In some embodiments of this application, the maximum length of the first end plate 101 and the second end plate 102 along the first direction XX is H, and the maximum length of the first end plate 101 and the second end plate 102 along the second direction YY is W, where H < 600 mm and W < 600 mm; wherein, the first direction XX is parallel to the first plane and the axis of the air outlet 106, the second direction YY is perpendicular to the first direction XX, and the second direction YY is parallel to the first plane.

[0058] Furthermore, the overall shape of the air outlet 106 is circular, and the diameter of the air outlet 106 is less than 0.5W. By limiting the size of the air outlet 106, more smoke can be discharged from the air chamber 107, thereby increasing the air volume of the air outlet 106 of the range hood volute 100, which is beneficial to the discharge of smoke.

[0059] Further, please see Figure 6 In some embodiments of this application, the centerline of the air inlet 105 is projected onto the first plane as point O. The first plane has a first axis M, a first reference point C1, and a second reference point C2. The first axis M is parallel to the second direction YY and intersects with point O. The first reference point C1 and the second reference point C2 are symmetrically distributed about the first axis M, and the distance between the first reference point C1 and the second reference point C2 is d, where 0.25H≤d≤0.5H. The first axis M and the avoidance line 103b have a first intersection point Q. In the second direction YY, the shortest distance from the first intersection point Q to the straight line passing through the first reference point C1 and the second reference point C2 is a, where 0.2W≤a≤0.5W.

[0060] It is easy to understand that, in the first plane, the orthographic projections of the first reference point C1 and the second reference point C2 are both located inside the orthographic projection of the first end plate 101. The first axis M is taken as the x-axis, and the straight line perpendicular to the first axis M and passing through the first intersection point Q is taken as the y-axis. The coordinates of the first intersection point Q are the coordinates of the origin (0, 0). At this time, the coordinates of the first reference point C1 are (-a, 0.5d), and the coordinates of the second reference point C2 are (-a, -0.5d). Thus, the relative positions of the first reference point C1 and the second reference point C2 are determined.

[0061] Among them, any point on the avoidance line 103b is taken as the flow point P. The distance between the flow point P and the first reference point C1 is r1, and the distance between the flow point P and the second reference point C2 is r2, (0.25d). 2 ≤r²×r²≤(0.36d) 2 This determines the shape of the avoidance line 103b, that is, r1×r2=k 2 k is a constant, and k satisfies 0.25d≤k≤0.36d.

[0062] It should be noted that, Figure 7 The middle section represents the complete curve of the Cassini oval curve. The equation of the Cassini oval curve is:

[0063] (x 2 +y 2 ) 2 -2b(x 2 -y 2 )=b 4 -c 4 (where b and c are constants).

[0064] In the first plane, the first axis M is taken as the x-axis, and the straight line passing through the first reference point C1 and the second reference point C2 is taken as the y-axis. The coordinates of the first reference point C1 are (0, 0.5d), and the coordinates of the second reference point C2 are (0, -0.5d), where d is a constant. The coordinates of the flowing point P are (x1, y1), because r1 × r2 = k. 2 ,so The equation, after simplification, becomes:

[0065] (x 2 +y 2 ) 2 -0.5d(x 2 -y 2 )=k 4 -(0.5d) 4 ;

[0066] In summary, the equation of the avoidance line 103b satisfies the curve equation of the Cassini oval curve. Therefore, the shape of the avoidance line 103b satisfies the characteristics of the Cassini oval curve, that is, the avoidance line 103b is a part of the shape of the Cassini oval curve. This makes the flue gas flow more uniformly at the avoidance surface 1032 of the flue gas volute 100, which can reduce the velocity gradient and eddy intensity of the flue gas, reduce the turbulent kinetic energy at the avoidance surface 1032, improve the flow uniformity, and thus reduce the aerodynamic noise of the flue gas volute 100.

[0067] It should also be noted that, Figure 8 (a) is a comparison curve of the air volume at the air outlet 106 of the volute casing 100 in the related art and the air volume at the air outlet 106 of the volute casing 100 in this application. Figure 8 In (a), the horizontal axis represents time, and the vertical axis represents the air volume at the air outlet 106. The solid line in the figure represents the air volume at the air outlet 106 of the range hood volute 100 of this application at different times, and the dashed line in the figure represents the air volume at the air outlet 106 of the range hood volute 100 in the related art at different times. Figure 8The curve in (a) shows that the air volume of the air outlet 106 of the volute 100 in this application is larger than that of the air outlet 106 of the volute 100 in the related art, indicating that the air volume of the volute 100 in this embodiment is larger and more conducive to the exhaust of flue gas.

[0068] Figure 8 Table (b) is a comparison table of the operating noise of the flue gas volute 100 in the related art and the flue gas volute 100 of this application. Figure 8 In the operating state described in (b), the range hood 2000 equipped with the volute 100 of this application has an operating noise of 61.2 dB(A), which is 3.1 dB(A) lower than the noise of the range hood 2000 equipped with the volute 100 in the related art. In the semi-silencing high fan speed mode, the noise of the range hood 2000 equipped with the volute 100 of this application is 50.5 dB(A), which is 5 dB(A) lower than the noise of the range hood 2000 equipped with the volute 100 in the related art. This shows that the noise generated by the volute 100 in this embodiment is lower.

[0069] Please see Figures 3-4 In some embodiments of this application, the volute 100 of the range hood also includes a guide ring 24, which is disposed at the air inlet 105 to guide the flue gas. The guide ring 24 is arranged in an arc shape facing away from the suction cavity 107, which facilitates the external flue gas to enter the air cavity 107 from the air inlet 105 along the arc-shaped protruding surface of the guide ring 24.

[0070] In some embodiments, such as Figure 3 As shown, a flow guide structure 25 is provided on the side of the guide ring 24 facing the centerline of the air inlet 105. That is, the first end of the guide ring 24 is connected to the inlet wall of the air inlet 105, and the second end of the guide ring 24 extends away from the air inlet 105. The flow guide structure 25 is located at the second end of the guide ring 24 to guide the external flue gas. The flow guide structure 25 can be a sawtooth structure or a beveled structure. Taking the side of the guide ring 24 facing the centerline of the air inlet 105 as an example, the sawtooth structure can disrupt the flow pattern of the vortex, thereby weakening or even eliminating the vortex phenomenon, achieving the effects of noise reduction and increased air volume.

[0071] Optionally, the guide ring 24 can be arranged in an arc shape facing away from the suction cavity 107. At the same time, the second end of the guide ring 24 is provided with a guide structure 25 to further guide the external smoke, so that more external smoke can enter the air cavity 107 along the guide ring 24.

[0072] Optionally, the housing 10 has an air inlet 105, and a guide ring 24 is provided around the air inlet 105. The air inlet 105 is provided on the first end plate 101, and the guide ring 24 is fixed on the first end plate 101; or, the air inlet 105 is provided on the second end plate 102, and the guide ring 24 is fixed on the second end plate 102.

[0073] Optionally, such as Figure 1 As shown, the housing 10 has at least two air inlets 105, through which external flue gas can enter the air cavity 107. Both the first end plate 101 and the second end plate 102 are provided with air inlets 105. A guide ring 24 is provided around the air inlet 105 on the first end plate 101. The guide ring 24 can be inclined, which facilitates the external flue gas to enter the air cavity 107 from the air inlet 105 along the inclined guide ring 24, thus guiding the flue gas. A limiting bracket 12 is provided at the air inlet 105 on the second end plate 102. The limiting bracket 12 is used for the installation of the fan 1000 inside the flue hood volute 100 and limits the fan 1000 inside, so that the fan 1000 can be stably installed inside the flue hood volute 100.

[0074] Secondly, please see Figures 9-11 This application embodiment also provides a fan 1000, including a fan assembly 200 and a range hood volute 100 as described in any of the above embodiments. The fan assembly 200 is disposed in the housing 10 of the range hood volute 100 and is fixedly installed inside the range hood volute 100. The fan assembly 200 is used to draw external smoke from the air inlet 105 of the range hood volute 100 into the air chamber 107 and to discharge the smoke in the air chamber 107 out of the air outlet 106.

[0075] It should be noted that the wind turbine assembly 200 includes a first frame 201 and a plurality of first blades 202. The plurality of first blades 202 are distributed circumferentially along the first frame 201 to form an air intake space 2011. Each first blade 202 has a leading edge surface 2021 facing the air intake space 2011 and a trailing edge surface 2022 facing away from the air intake space 2011. When the flue gas in the air intake space 2011 is discharged outward, it will first contact the leading edge surface 2021 of the first blade 202, and then be discharged from the trailing edge surface 2022 of the first blade 202 into the air intake space 2011. At least one end of the leading edge surface 2021 is provided with a guide surface 202a. The guide surface 202a can be inclined or curved, so that the flue gas in the intake space 2011 can flow along the guide surface 202a at the end of the leading edge surface 2021, reducing the generation of vortices in the flue gas at the end of the first blade 202 and reducing airflow loss.

[0076] In some embodiments, guide surfaces 202a can be provided at both ends of the leading edge surface 2021 of the first blade 202. These guide surfaces 202a at both ends of the leading edge surface 2021 can be either guide arc surfaces or guide slope surfaces. Alternatively, one end of the guide surface 202a can be a guide arc surface, and the other end a guide slope surface. The shape of the guide surfaces 202a is not specifically limited, but it can change the flow path of the flue gas in the intake space 2011 when passing through the guide surfaces 202a, reducing or eliminating the vortex region generated by the direct impact of the flue gas on the first blade 202, thereby further reducing the vortex generated by the flue gas in the intake space 2011 when flowing through the first blade 202. The guide surfaces 202a at both ends of the leading edge surface 2021 are spaced apart; or, the ends of the guide surfaces 202a at both ends of the leading edge surface 2021 are connected to each other.

[0077] Specifically, such as Figure 10 As shown, the first blade 202 is a backward-curved blade, which can increase the air pressure of the flue gas exiting the intake space 2011. That is, the first blade 202 has a concave part and a convex part that are arranged opposite to each other. The outer surface of the concave part of the first blade 202 is the pressure surface 2025, which is the side that the fluid contacts when passing through the first blade 202. That is, the airflow pressure generated by the fluid on this side is greater. The outer surface of the convex part of the first blade 202 is the suction surface (the suction surface is opposite to the pressure surface 2025), which means that the airflow pressure generated by the fluid on this side is lower. The left and right ends of the pressure surface 2025 are connected to the leading edge surface 2021 and the trailing edge surface 2022, respectively. The left and right ends of the suction surface are also connected to the leading edge surface 2021 and the trailing edge surface 2022, respectively.

[0078] like Figures 9-10 As shown, taking the guide surface 202a at the end of the leading edge surface 2021 of the first blade 202 as the guide slope 202a1 as an example, in Figure 10 In (I), the first blade 202 has a first end face 2023 and a second end face 2024 disposed opposite to each other. At least one of the first end face 2023 and the second end face 2024 is connected to the first frame 201. The leading edge surface 2021, the first end face 2023, the trailing edge surface 2022, and the second end face 2024 are connected sequentially. The first reference plane is parallel to the second end face 2024. It can be understood that the first reference plane can be the plane through which the second end face 2024 passes. The orthographic projection of the leading edge surface 2021 on the first reference plane has a corresponding leading edge line 2021a, and the orthographic projection of the trailing edge surface 2022 on the first reference plane has a corresponding trailing edge line 2022a. Figure 10In the diagram (Ⅲ), the first blade 202 is projected onto the first reference plane. The leading edge line 2021a and the trailing edge line 2022a are inclined relative to the intake space 2011. Therefore, the leading edge line 2021a has a first endpoint E1 close to the intake space 2011, and the trailing edge line 2022a has a second endpoint E2 far from the intake space 2011. The length of the line connecting the first endpoint E1 and the second endpoint E2 on the orthographic projection onto the first reference plane is W1. It can be understood that the pressure surface 2025 of the first blade 202 has a corresponding pressure line 2025a projected onto the first reference plane, such as... Figure 10 As shown in (II), the maximum width of the first blade 202 is W1 in the direction perpendicular to the line connecting the two endpoints of the pressure line 2025a.

[0079] Wherein, the guide surface 202a located at the first end of the leading edge surface 2021 is the first guide slope, the guide surface 202a located at the second end of the leading edge surface 2021 is the second guide slope, the second reference plane passes through the first endpoint E1 and the second endpoint E2, and the second reference plane is perpendicular to the first reference plane. Figure 10 (II) shows the orthographic projection length of the guide slope 202a1 on the first blade 202 onto the second reference plane. Optionally, the orthographic projection length of the first guide slope on the second reference plane is W2, where W2 satisfies 0.1W1≤W2≤0.5W1; alternatively, the orthographic projection length of the second guide slope on the second reference plane is W3, where W3 satisfies 0.1W1≤W3≤0.5W1. This embodiment limits the dimensions of the two guide surfaces 202a on the first blade 202 to minimize eddies by maximizing the cutting length of the guide surfaces 202a.

[0080] Furthermore, the first and second guiding slopes, when projected onto the second reference plane, have corresponding first and second guiding slopes. The length of the first guiding slope is R1, and the length of the second guiding slope is R2, where R1 ≤ R2.

[0081] Optionally, the first guide slope and the second guide slope can be the same, that is, the first guide slope and the second guide slope are the same; alternatively, the length of the second guide slope is longer than the length of the first guide slope, that is, the second guide slope is larger than the first guide slope, so that more flue gas in the intake space 2011 can flow along the guide surface 202a to increase the air volume at the first blade 202.

[0082] In some embodiments, the first frame 201 has two openings that are arranged opposite to each other. The first guide slope and the second guide slope are respectively adjacent to the two different openings on the first frame 201. When the air intake volume of the two openings is different, the opening with a larger air intake volume is arranged in relation to the guide slope with a larger orthographic projection length, that is, the opening with a larger air intake volume is arranged in relation to the second guide slope.

[0083] It should also be noted that the casing 10 of the flue gas hood volute 100 has an air inlet 105 and an air outlet 106. When the impeller assembly 200 is located inside the casing 10, the opening on the first frame 201 corresponds to the air inlet 105 on the casing 10, and the axis of the impeller assembly 200, which is also the axis of the first frame 201, is collinear with the axis of the air inlet 105 on the casing 10. A centrifugal fan is installed in the first frame 201 of the impeller assembly 200. When the centrifugal fan starts, external flue gas can enter the opening and the intake space 2011 from the air inlet 105. At the same time, the drive motor starts, which drives the entire impeller assembly 200 to rotate around its axis inside the casing. As the impeller assembly 200 rotates, the first blades 202 drive the flue gas in the intake space 2011 to rotate, thus doing work on the flue gas, increasing its energy, and causing the flue gas to move under centrifugal force. The flue gas is thrown out from all sides of the impeller assembly 200 and enters the air chamber 107. Then, the velocity energy of the flue gas is converted into pressure energy by the housing 10 and discharged from the air outlet 106 on the housing 10. After the flue gas in the impeller assembly 200 is discharged, the pressure inside the impeller assembly 200 is lower than the pressure at the air inlet 105 of the housing 10. Therefore, the flue gas outside the flue gas volute 100 will be drawn into the impeller assembly 200 under the action of the pressure difference, so that the flue gas can continuously enter the impeller assembly 200 and be discharged by the centrifugal fan.

[0084] It should also be noted that the casing 10 of the flue gas hood volute 100 has an air inlet 105 and an air outlet 106. When the impeller assembly 200 is located inside the casing 10, the opening on the first frame 201 corresponds to the air inlet 105 on the casing 10, and the axis of the impeller assembly 200, which is also the axis of the first frame 201, is collinear with the axis of the air inlet 105 on the casing 10. A centrifugal fan is installed in the first frame 201 of the impeller assembly 200. When the centrifugal fan starts, external flue gas can enter the opening and the intake space 2011 from the air inlet 105. At the same time, the drive motor starts, which drives the entire impeller assembly 200 to rotate around its axis inside the casing. As the impeller assembly 200 rotates, the first blades 202 drive the flue gas in the intake space 2011 to rotate, thus doing work on the flue gas, increasing its energy, and causing the flue gas to move under centrifugal force. The flue gas is thrown out from all sides of the impeller assembly 200 and enters the air chamber 107. Then, the velocity energy of the flue gas is converted into pressure energy by the housing 10 and discharged from the air outlet 106 on the housing 10. After the flue gas in the impeller assembly 200 is discharged, the pressure inside the impeller assembly 200 is lower than the pressure at the air inlet 105 of the housing 10. Therefore, the flue gas outside the flue gas volute 100 will be drawn into the impeller assembly 200 under the action of the pressure difference, so that the flue gas can continuously enter the impeller assembly 200 and be discharged by the centrifugal fan.

[0085] Thirdly, please see Figure 11 This application also provides a range hood 2000, including a main body 300 and a fan 1000 as described in the above embodiments. The main body 300 is provided with a flue 301 and an exhaust port 301 connected to the flue 301. The flue 301 is connected to an air inlet 105, and the exhaust port 106 is connected to the outside of the main body 300. The fan 1000 is located inside the main body 300. The fan 1000 draws the smoke from the exhaust port 301 into the flue 301 and the air inlet 105, and discharges the smoke from the exhaust port 106 into the range hood 2000.

[0086] Specifically, the range hood 2000 also includes a mounting bracket 11, which can be set between the end plate of the range hood volute 100 and the main body 300, and the fan 1000 is fixed to the main body 300 by the mounting bracket 11.

[0087] In some embodiments of this application, such as Figure 11 As shown, the range hood 2000 also includes a check valve 13 connected to the main body 300. The check valve 13 is located at the air outlet 106. The check valve 13 allows the smoke to be discharged unidirectionally from the air chamber 107 of the range hood volute 100 to the air outlet 106, preventing the smoke from flowing back from the air outlet 106 to the air chamber 107 and the air inlet 105.

[0088] Specifically, the main body 300 includes a top plate 14 and a bottom plate, with the top plate 14 and bottom plate positioned opposite each other. An exhaust port 301 is located on the bottom plate, and an exhaust port 106 is located on the top plate 14. A check valve 13 is installed on the top plate 14. After the range hood 2000 is installed, the bottom plate and exhaust port 301 are close to the gas stove, while the top plate 14 is away from the gas stove. The exhaust port 106 is connected to the outside of the kitchen via the check valve 13 and a flue pipe, allowing the range hood 2000 to draw the fumes generated by the gas stove outside the kitchen. The working principle of the range hood 2000 has been disclosed in relevant technologies and will not be elaborated here.

[0089] In the accompanying drawings of this embodiment, the same or similar reference numerals correspond to the same or similar components. In the description of this application, it should be understood that if terms such as "upper," "lower," "left," and "right" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the components or elements referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting this application. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0090] The above are merely preferred embodiments of this application and are not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A range hood volute, characterized in that, Includes a housing, the housing comprising: First end plate; The second end plate is disposed at a distance from the first end plate; A peripheral side plate is located between the first end plate and the second end plate. Both ends of the peripheral side plate are provided with arc-shaped transition portions. The first end of the peripheral side plate is connected to the first end plate through one of the arc-shaped transition portions, and the second end of the peripheral side plate is connected to the second end plate through another arc-shaped transition portion. The first end plate, the peripheral side plate, the arc-shaped transition portions, and the second end plate together form an air cavity and an air outlet. The air outlet communicates with the air cavity. An air inlet communicating with the air cavity is opened on the first end plate and / or the second end plate. The outer contour of the peripheral side plate projected onto the first plane includes a first arc, a clearance line, and a second arc arranged sequentially and connected along the periphery of the peripheral side plate. The first plane is perpendicular to the axis of the air inlet, and the radius of curvature at each point on the clearance line is greater than the radius of curvature at each point on the first arc and the second arc.

2. The volute casing of the range hood according to claim 1, characterized in that, The radius of curvature at each point on the second arc is greater than the radius of curvature at each point on the first arc, and the radius of curvature at each point on the avoidance line is greater than the radius of curvature at each point on the second arc.

3. The volute casing of the range hood according to claim 1, characterized in that, The air outlet is circular in shape.

4. The volute casing of the range hood according to claim 1, characterized in that, The distance between the first end plate and the second end plate is B, the arc-shaped transition portion is arc-shaped, and the radius of the arc-shaped transition portion is less than or equal to 0.5B.

5. The volute casing of the range hood according to claim 1, characterized in that, The air outlet has an orthographic projection area on the first plane, the first end of the first arc extends to the orthographic projection area of ​​the air outlet, and the second end of the first arc is connected to the avoidance line. The first end of the second arc is connected to the avoidance line, and the second end of the second arc extends to the orthographic projection area of ​​the air outlet.

6. The volute casing of the range hood according to claim 1, characterized in that, The air outlet has an orthographic projection area on the first plane; the outer contour of the orthographic projection of the peripheral side plate on the first plane includes two oppositely arranged avoidance lines, which are located on both sides of the orthographic projection area of ​​the air outlet.

7. The volute casing of the range hood according to claim 1, characterized in that, The maximum length of the first end plate and the second end plate along the first direction is H, and the maximum length of the first end plate and the second end plate along the second direction is W, where H < 600 mm and W < 600 mm. Wherein, the first direction is parallel to both the first plane and the axial direction of the air outlet, the second direction is perpendicular to the first direction, and the second direction is parallel to the first plane.

8. The volute casing of the range hood according to claim 7, characterized in that, The air outlet is circular in shape, and its diameter is less than 0.5W.

9. The volute casing of the range hood according to claim 7, characterized in that, The orthographic projection of the centerline of the air inlet onto the first plane is point O. The first plane has a first axis, a first reference point, and a second reference point. The first axis is parallel to the second direction and intersects with point O. The first reference point and the second reference point are symmetrically distributed about the first axis, and the distance between the first reference point and the second reference point is d, where 0.25H≤d≤0.5H. The first axis and the avoidance line have a first intersection point. In the second direction, the shortest distance from the first intersection point to the straight line passing through the first reference point and the second reference point is a, where 0.2W≤a≤0.5W. The distance between the flow point on the avoidance line and the first reference point is r1, and the distance between the flow point and the second reference point is r2, (0.25d). 2 ≤r²×r²≤(0.36d) 2 .

10. The volute casing of the range hood according to claim 1, characterized in that, A guide ring is provided at the air inlet, and the guide ring is arranged in an arc shape protruding in the direction away from the air suction cavity, and / or, a guide structure is provided on the side of the guide ring facing the axis of the air inlet.

11. The volute casing of the range hood according to claim 1, characterized in that, Both the first end plate and the second end plate are provided with air inlets. A guide ring is provided at the air inlet on the first end plate, and a limit bracket is provided at the air inlet on the second end plate.

12. A fan, characterized in that, include: The volute casing of the smoke hood as described in any one of claims 1 to 11; and, A fan assembly is disposed within the housing of the flue gas hood volute.

13. A range hood, characterized in that, include: The fan as described in claim 12; and, The main body is provided with a flue and an exhaust port connected to the flue. The flue is connected to the air inlet. The fan is located inside the main body. The fan draws the flue gas from the exhaust port into the flue and the air inlet, and discharges the flue gas from the exhaust port into the range hood.

14. The range hood according to claim 13, characterized in that, The range hood also includes a check valve connected to the main body. The check valve is located at the air outlet and is used to allow the smoke in the range hood to be discharged from the air outlet.

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