Range hood volute, fan and range hood

Abstract

The utility model 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, the peripheral side plate is connected and perpendicular to the first end plate and the second end plate, an air cavity and an air outlet are defined by the first end plate, the peripheral side plate and the second end plate, the air outlet is communicated with the air cavity, and 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, an avoiding line and a second arc line which are sequentially arranged in the peripheral side direction of the peripheral side plate and connected, the first plane is perpendicular to the axis of the air inlet, and the curvature radius of each position on the avoiding line is larger than the curvature radius of each position on the first arc line and the curvature radius of each position on the second arc line. According to the embodiment, on the basis that vortex is reduced, the production cost of the range hood volute is reduced, and production and connection of the range hood volute are facilitated.

Description

Technical Field

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

[0002] Range hoods have become an essential appliance in every kitchen, absorbing cooking fumes and effectively directing them outdoors, freeing the kitchen from the fumes. The volute of a range hood collects the smoke entering from the impeller and discharges it through the volute's outlet, acting as both a gas collector and a pressure diffuser. To reduce eddy currents, the volute's various joints are connected using curved sheet metal. This makes manufacturing the volute difficult and increases mold costs. Utility Model Content

[0003] The embodiments of the present application provide a range hood volute, a fan, and a range hood, which can reduce the production cost of the range hood volute while reducing eddy currents.

[0004] In a first aspect, an embodiment of the present application provides a range hood volute, comprising a housing, the housing comprising:

[0005] a first end plate;

[0006] a second end plate, spaced apart and arranged opposite to the first end plate;

[0007] a peripheral side plate, located between the first end plate and the second end plate, the peripheral side plate being connected to and perpendicular to the first end plate and the second end plate, the first end plate, the peripheral side plate and the second end plate together forming an air cavity and an air outlet, the air outlet being in communication with the air cavity, and an air inlet in communication with the air cavity being formed on the first end plate and / or the second end plate;

[0008] Among them, the outer contour of the positive projection of the circumferential side panel on the first plane includes a first arc line, a avoidance line and a second arc line arranged and connected in sequence along the circumferential direction of the circumferential side panel, the first plane is perpendicular to the axial center line of the air inlet, and the curvature radius of each point on the avoidance line is greater than the curvature radius of each point on the first arc line and the second arc line.

[0009] In some embodiments of the present 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 the present application, the overall shape of the air outlet is square.

[0011] In some embodiments of the present 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.

[0012] In some embodiments of the present application, the air outlet has a direct projection area on the first plane; the outer contour of the direct projection of the peripheral side panel on the first plane includes two relatively arranged avoidance lines, and the two avoidance lines are respectively located on both sides of the direct projection area of ​​the air outlet.

[0013] In some embodiments of the present 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, H < 600 mm, 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.

[0014] In some embodiments of the present application, the orthographic projection of the axis of the air inlet on the first plane is point O, and 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, 0.25H≤d≤0.5H; the first axis and the avoidance line have a first intersection, and in the second direction, the shortest distance from the first intersection to the straight line passing through the first reference point and the second reference point is a, 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 .

[0015] In some embodiments of the present application, a guide ring is provided at the air inlet, and the guide ring is provided in an arc-shaped protrusion facing away from the wind cavity, and / or a guide structure is provided on the side of the guide ring facing the axis of the air inlet.

[0016] In some embodiments of the present 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 limiting bracket is provided at the air inlet on the second end plate.

[0017] In a second aspect, the embodiments of the present application provide a fan, comprising a wind wheel assembly and the range hood volute according to any of the above embodiments, wherein the wind wheel assembly is arranged in the shell of the range hood volute.

[0018] In a third aspect, the embodiments of the present application provide a range hood, comprising a main body and the fan according to any of the above embodiments, wherein the main body is provided with a flue and an air suction opening in communication with the flue, the flue is in communication with the air inlet, the fan is arranged in the main body, the fan sucks the flue gas from the air suction opening into the flue and the air inlet, and the fan discharges the flue gas from the air outlet out of the range hood.

[0019] In some embodiments of the present application, the range hood further comprises a check valve connected to the main body, the check valve is located at the air outlet, and the check valve is used for discharging the flue gas in the range hood from the air outlet.

[0020] Based on the range hood volute, the fan and the range hood according to the embodiments of the present application, in the embodiments, the outer contour of the normal projection of the side part of the range hood volute on the first plane is arranged in the shape of the avoidance line, thereby reducing the protrusion height of the side part of the range hood volute, reducing the volume of the range hood volute, improving the flow condition of the flue gas at the avoidance surface of the range hood volute, reducing the backflow and vortex phenomenon of the flue gas at the avoidance surface of the range hood volute, and reducing the noise generated by the range hood volute when sucking the flue gas. Meanwhile, the connection between the peripheral side plate and the first end plate and the second end plate is arranged in a 90° right angle, facilitating the production and connection between the first end plate, the peripheral side plate and the second end plate, reducing the mold opening cost of the range hood volute, and reducing the manufacturing difficulty of the range hood volute, thereby facilitating the batch production of the range hood volute. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0022] Figure 1 FIG. 1 is a first perspective view of a range hood volute according to an embodiment of the present application;

[0023] Figure 2 FIG. 2 is a second perspective view of the range hood volute according to the embodiment of the present application;

[0024] Figure 3 FIG. 3 is a cross-sectional view of the range hood volute according to the embodiment of the present application;

[0025] Figure 4A third perspective view of the smoke machine volute according to an embodiment of the present application;

[0026] Figure 5 A projection of the smoke machine volute according to an embodiment of the present application on a first plane;

[0027] Figure 6 A Cassini oval;

[0028] Figure 7 A comparison curve of air volume at the air outlet of the smoke machine volute according to the present application and that of a related art smoke machine volute;

[0029] Figure 8 A structure diagram of the fan according to an embodiment of the present application;

[0030] Figure 9 A structure diagram of the first blade according to an embodiment of the present application and a projection view of the first blade on a first reference plane;

[0031] Figure 10 A structure diagram of the smoke machine according to an embodiment of the present application.

[0032] Reference signs:

[0033] 100, smoke machine volute; 10, shell; 101, first end plate; 102, second end plate; 103, peripheral side plate; 1031, first curved surface; 103a, first curved line; 1032, avoidance surface; 103b, avoidance line; 1033, second curved surface; 103c, second curved line; 105, air inlet; 106, air outlet; 107, air cavity; 24, flow guide ring; 25, flow guide structure; 12, limiting support;

[0034] 1000, fan; 200, fan wheel assembly; 201, first frame body; 2011, air inlet space; 202, first blade; 202a, flow guide surface; 202a1, flow guide inclined surface; 2021, leading edge surface; 2021a, leading edge line; 2022, trailing edge surface; 2022a, trailing edge line; 2023, first end surface; 2024, second end surface; 2025, pressure surface; 2025a, pressure line;

[0035] 2000, smoke machine; 300, main body; 301, air suction port; 11, mounting support; 13, check valve; 14, top plate;

[0036] XX, first direction; YY, second direction; M, first axis. DETAILED DESCRIPTION

[0037] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the technical solutions in the related art, the following will clearly and completely describe the embodiments with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of the present application.

[0038] In the related art, in order to reduce the vortex, each joint of the volute is connected by an arc-shaped sheet metal, so that the manufacturing difficulty of the volute is great, and the mold opening cost is high.

[0039] In view of the above, in a first aspect, referring to Figure 1 The present application provides a range hood volute 100 for installation in a range hood 2000, and a fan 1000 for absorbing flue gas can be installed in the range hood volute 100.

[0040] As Figure 1-Figure 3 shown, the range hood volute 100 includes a housing 10, the housing 10 includes a first end plate 101, a second end plate 102, and a peripheral side plate 103, the first end plate 101 and the second end plate 102 are oppositely spaced, the peripheral side plate 103 is located between the first end plate 101 and the second end plate 102, the peripheral side plate 103 is connected to the first end plate 101 and the second end plate 102 perpendicularly, the first end plate 101, the peripheral side plate 103, and the second end plate 102 jointly form an air cavity 107 and an air outlet 106, the air outlet 106 is in communication with the air cavity 107, and the first end plate 101 and / or the second end plate 102 is provided with an air inlet 105 in communication with the air cavity 107.

[0041] Specifically, the connection between the peripheral side plate 103 and the first end plate 101 and the second end plate 102 is provided as a 90° right angle, which facilitates the production and connection between the first end plate 101, the peripheral side plate 103, and the second end plate 102. For example, the first end plate 101 and the second end plate 102 can be planar plate structures, and the peripheral side plate 103 can be formed by bending a long strip-shaped planar plate structure along its length direction. The side of the planar plate structure can be directly connected to the side of the peripheral side plate 103 in the width direction. Thus, not only can the mold opening cost of the range hood volute 100 be reduced, but also the manufacturing difficulty of the range hood volute 100 can be reduced, thereby facilitating the mass production of the range hood volute 100. Among them, the housing 10 can be provided with an air inlet 105 in communication with the air cavity 107, that is, the air inlet mode of the range hood volute 100 is single-sided air inlet; or the first end plate 101 and the second end plate 102 are both provided with an air inlet 105 in communication with the air cavity 107, that is, the air inlet mode of the range hood volute 100 is double-sided air inlet. The flue gas can be sucked into the air cavity 107 through the air inlet 105 on the housing 10 under the action of the fan 1000, and then discharged from the air outlet 106.

[0042] like Figure 4-Figure 5 As shown, the outer contour of the orthographic projection of the circumferential side plate 103 on the first plane includes a first arc line 103a, a avoidance line 103b and a second arc line 103c arranged in sequence and connected along the circumferential direction of the circumferential side plate 103. For example, Figure 5 In the figure, the first arc 103a and the second arc 103c are dotted lines, and 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 of each point on the avoidance line 103b is greater than the radius of curvature of each point on the first arc 103a and the second arc 103c. It can be understood that the radius of curvature of each point 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 as a whole (closer to a straight line).

[0043] Specifically, the outer peripheral side surface of the peripheral side plate 103 includes a first arc surface 1031, a position avoidance surface 1032 and a second arc surface 1033 arranged in sequence and connected along the peripheral direction of the peripheral side plate 103, and the two ends of the position avoidance surface 1032 are connected to the first arc surface 1031 and the second arc surface 1033 respectively, wherein 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 position avoidance surface 1032 on the first plane corresponds to the position avoidance line 103b, and the orthographic projection of the second arc surface 1033 on the first plane corresponds to the position avoidance line 103c. Corresponding to the second arc 103c, the avoidance line 103b and the first arc 103a and the second arc 103c are all arc-shaped transition lines, that is, the avoidance surface 1032 and the first arc surface 1031 and the second arc surface 1033 are all arc-shaped surface transitions. Compared with the transition of two planes at an angle, the arc-shaped surface transition can ensure that there are no sharp corners at the connection between the two surfaces. The arc-shaped surface transition is more in line with the flow pattern of the airflow and can reduce the backflow and vortex phenomenon of the smoke caused by sharp corners (such as right angles, acute angles or obtuse angles).

[0044] It should be noted that the range hood volute 100 is installed in the installation space of the range hood 2000, so the volume of the range hood volute 100 is limited by the installation space of the range hood 2000. Because the curvature radius of each part on the avoidance line 103b is the largest compared to the first arc 103a and the second arc 103c, the avoidance line 103b is smoother than the first arc 103a and the second arc 103c. If the side of the range hood volute 100 has a curvature that exceeds the installation space, the range hood volute 100 will be installed in the installation space. area, the outer contour of the positive projection of the side of the range hood volute 100 on the first plane can be set to the shape of the avoidance line 103b, thereby reducing the protruding height of the side of the range hood volute 100, and reducing the volume of the range hood volute 100. At the same time, it can also improve the flow of smoke at the avoidance surface 1032 of the range hood volute 100, reduce the backflow and vortex phenomenon of smoke at the avoidance surface 1032 of the range hood volute 100, and reduce the noise generated by the range hood volute 100 when smoking. At the same time, the connection between the peripheral side plate 103 and the first end plate 101 and the second end plate 102 is set at a 90° right angle, which is convenient for the production and connection between the first end plate 101, the peripheral side plate 103 and the second end plate 102, which can not only reduce the mold opening cost of the range hood volute 100, but also reduce the manufacturing difficulty of the range hood volute 100, thereby facilitating the mass production of the range hood volute 100.

[0045] Furthermore, in some embodiments, the radius of curvature at each location on the second arc 103c is greater than the radius of curvature at each location 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 each location on the avoidance line 103b is greater than the radius of curvature at each location on the second arc 103c. In other words, the radius of curvature at each location on the avoidance line 103b is the largest compared to the first and second arcs 103a, 103c. In other words, the curvature of the avoidance line 103b is less than that of the first and second arcs 103a, 103c, and the avoidance line 103b is smoother overall (closer to a straight line).

[0046] Alternatively, as Figure 4 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.

[0047] 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 positive 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 and is perpendicular, when the overall shape of the air outlet 106 is When the shape is square, the side surface of the first end plate 101 close to the second end plate 102 is perpendicular to the first curved surface 1031 and the second curved surface 1033, and the side surface of the second end plate 102 close to the first end plate 101 is perpendicular to the first curved surface 1031 and the second curved surface 1033, so that the first end plate 101 and the second end plate 102 can be a flat plate structure, so as to reduce the manufacturing difficulty of the range hood volute 100, thereby facilitating the mass production of the range hood volute 100.

[0048] Alternatively, as Figure 5 As shown, the outer contour of the orthographic projection of the peripheral side plate 103 on the first plane includes two oppositely arranged avoidance lines 103 b , and the two avoidance lines 103 b are respectively located on both sides of the orthographic projection area of ​​the air outlet 106 .

[0049] It should be noted that the outer peripheral side surface of the peripheral side plate 103 includes a first curved surface 1031, a first avoidance surface 1032, a second curved surface 1033 and a second avoidance surface 1032 which are arranged in sequence and connected along the peripheral direction of the peripheral side plate 103, the orthographic projection of the first curved surface 1031 on the first plane corresponds to the first arc line 103a, the orthographic projection of the first avoidance surface 1032 on the first plane corresponds to the avoidance line 103b, the orthographic projection of the second curved surface 1033 on the first plane corresponds to the second arc line 103c, the orthographic projection of the second avoidance surface 1032 on the first plane has the same shape as the avoidance line 103b, the first avoidance surface 1032 and the second avoidance surface 1032 are respectively 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 curved surface 1031 and the second avoidance surface 1032. Figure 1-Figure 2 As shown, the setting of the avoidance surface 1032 on the range hood volute 100 is added, so that the range hood volute 100 can reduce the volume while further improving the flow of smoke at the avoidance surface 1032 of the range hood volute 100, reducing the backflow and vortex phenomenon of smoke at the avoidance surface 1032 of the range hood volute 100, increasing the exhaust volume of the air outlet 106, and reducing the noise generated by the range hood volute 100 when smoking.

[0050] See Figure 4In some embodiments of the present 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, H<600mm, W<600mm; wherein, the first direction XX is parallel to the first plane and the axial direction 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.

[0051] Further, see Figure 5 In some embodiments of the present application, the orthographic projection of the center line of the air inlet 105 on the first plane is point O, and 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, 0.25H≤d≤0.5H; the first axis M and the avoidance line 103b have a first intersection point Q, and 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, 0.2W≤a≤0.5W.

[0052] 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, with the first axis M as the x-axis, and the straight line perpendicular to the first axis M and passing through the first intersection Q as the y-axis. The coordinates of the first intersection Q are the origin coordinates (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), thereby determining the relative positions of the first reference point C1 and the second reference point C2.

[0053] 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 , thereby determining the line shape of the avoidance line 103b, that is, r1×r2=k 2 , k is a constant, and k satisfies 0.25d≤k≤0.36d.

[0054] It should be noted that Figure 6 The complete curve of the Cassini oval is shown in the figure. The curve equation of the Cassini oval is:

[0055] (x 2 +y 2 ) 2 -2b(x 2 -y2 )=b 4 -c 4 (where b and c are constants).

[0056] In the first plane, the first axis M is the x-axis, and the straight line passing through the first reference point C1 and the second reference point C2 is the y-axis. At this time, 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 flow point P are (x1, y1), because r1×r2=k 2 ,so This equation is simplified to:

[0057] (x 2 +y 2 ) 2 -0.5d(x 2 -y 2 )=k 4 -(0.5d) 4 ;

[0058] In summary, the equation of the avoidance line 103b satisfies the curve equation of the Cassini oval, so the line shape of the avoidance line 103b satisfies the characteristics of the Cassini oval, that is, the avoidance line 103b is a part of the line shape on the Cassini oval, so that the flue gas flows more evenly at the avoidance surface 1032 of the range hood volute 100, which can reduce the velocity gradient and vortex 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 range hood volute 100.

[0059] It should also be noted that Figure 7 The graph in the middle is a comparison of the air volume of the air outlet 106 of the range hood volute 100 in the related art and the air volume of the air outlet 106 of the range hood volute 100 of the present application. Figure 7 In the figure, the horizontal axis is time, the vertical axis is the air volume of the air outlet 106, the solid line in the figure is the air volume of the air outlet 106 of the range hood volute 100 of the present application at different times, and the dotted line in the figure is the air volume of the air outlet 106 of the range hood volute 100 in the related art at different times. Figure 7 The curve graph shows that the air volume of the air outlet 106 of the range hood volute 100 in this application is greater than that of the air outlet 106 of the range hood volute 100 in the related art, indicating that the air volume of the range hood volute 100 in this embodiment is larger and more conducive to the discharge of smoke.

[0060]

[0061] The above table is a comparison table of working noise tests of the smoke machine volute 100 in the related art and the smoke machine volute 100 of the present application. In the working state in the above table, the range hood 2000 provided with the smoke machine volute 100 of the present application has a working noise of 61.2 dB(A), which is 2.3 dB(A) lower than the noise of the range hood 2000 provided with the smoke machine volute 100 in the related art. In the case of half-muffled high wind speed, the range hood 2000 provided with the smoke machine volute 100 of the present application has a noise of 51.3 dB(A), which is 4.2 dB(A) lower than the noise of the range hood 2000 provided with the smoke machine volute 100 in the related art. Thus, it is illustrated that the smoke machine volute 100 in the present embodiment produces less noise.

[0062] Please refer to Figure 3 In some embodiments of the present application, the smoke machine volute 100 further comprises a flow guide ring 24, which is arranged at the air inlet 105 to guide the smoke. The flow guide ring 24 is arranged in an arc shape protruding towards the direction away from the air cavity 107, which is beneficial for the external smoke to enter the air cavity 107 from the air inlet 105 along the arc-shaped protruding surface of the flow guide ring 24.

[0063] In some embodiments, as shown in Figure 3 The flow guide ring 24 is provided with a flow guide structure 25 on one side of the axis of the air inlet 105, that is, the first end of the flow guide ring 24 is connected to the wall of the air inlet 105, and the second end of the flow guide ring 24 extends away from the air inlet 105, and the flow guide structure 25 is arranged at the second end of the flow guide ring 24 to guide the external smoke. The flow guide structure 25 can be a sawtooth structure or an inclined surface structure. Taking the case that the flow guide ring 24 is provided with a sawtooth structure on one side of the axis of the air inlet 105 as an example, the sawtooth structure can destroy the flow rule of the vortex, thereby weakening or even eliminating the vortex phenomenon, achieving the effect of noise reduction and improving the air volume.

[0064] Optionally, the flow guide ring 24 can be arranged in an arc shape protruding towards the direction away from the air cavity 107, and the second end of the flow guide ring 24 is provided with a flow guide structure 25 to further guide the external smoke, so that more external smoke can enter the air cavity 107 along the flow guide ring 24.

[0065] Optionally, the shell 10 has an air inlet 105 provided with a flow guide ring 24. The air inlet 105 is formed in the first end plate 101, and the flow guide ring 24 is fixed to the first end plate 101. Alternatively, the air inlet 105 is formed in the second end plate 102, and the flow guide ring 24 is fixed to the second end plate 102.

[0066] Optionally, as shown in Figure 1As shown, the shell 10 has at least two air inlets 105, and external flue gas can enter the air cavity 107 from the two air inlets 105 of the shell 10. The first end plate 101 and the second end plate 102 are both provided with air inlets 105. The air inlets 105 on the first end plate 101 are provided with a flow guide ring 24. The flow guide ring 24 can be arranged in an inclined manner, which is conducive to the external flue gas entering the air cavity 107 from the air inlets 105 along the inclined flow guide ring 24, thereby guiding the flue gas. The air inlets 105 on the second end plate 102 are provided with a limiting support 12. The limiting support 12 is used for mounting the fan 1000 inside the smoke machine volute 100 and limiting the fan 1000 inside, so that the fan 1000 can be stably mounted inside the smoke machine volute 100.

[0067] In a second aspect, referring to Figure 8 The embodiment of the present application also provides a fan 1000, which comprises a wind wheel assembly 200 and a smoke machine volute 100 as described in any of the above embodiments. The wind wheel assembly 200 is arranged in the shell 10 of the smoke machine volute 100 and is fixedly installed inside the smoke machine volute 100. The wind wheel assembly 200 is used for sucking external flue gas into the air cavity 107 from the air inlets 105 of the smoke machine volute 100 and discharging the flue gas in the air cavity 107 from the air outlets 106.

[0068] It should be noted that the wind wheel assembly 200 comprises a first frame body 201 and a plurality of first blades 202. The plurality of first blades 202 are distributed along the circumference of the first frame body 201 to form an air inlet space 2011. Each first blade 202 has a leading edge surface 2021 facing the air inlet space 2011 and a trailing edge surface 2022 facing away from the air inlet space 2011. In the process of discharging outward, the flue gas in the air inlet space 2011 first contacts the leading edge surface 2021 of the first blade 202 and then discharges from the trailing edge surface 2022 of the first blade 202. At least one end of the leading edge surface 2021 is provided with a flow guide surface 202a, which can be arranged in an inclined manner or an arcuate manner. Therefore, the flue gas in the air inlet space 2011 can flow along the flow guide surface 202a at the end of the leading edge surface 2021, thereby reducing the vortex of the flue gas at the end of the first blade 202 and reducing the loss of airflow.

[0069] In some embodiments, guide surfaces 202a may be provided at opposite ends of the leading edge surface 2021 of the first blade 202. The guide surfaces 202a at opposite ends of the leading edge surface 2021 may be both curved guide surfaces, or both inclined guide surfaces, or the guide surface 202a at one end of the leading edge surface 2021 may be a curved guide surface and the guide surface 202a at the other end may be an inclined guide surface. The shape of the guide surfaces 202a is not specifically limited, and can alter the flow path of the flue gas in the air intake space 2011 as it passes through the guide surfaces 202a, thereby reducing or eliminating vortex regions generated by the flue gas directly impacting the first blade 202, thereby further reducing vortexes generated by the flue gas in the air intake space 2011 as it flows through the first blade 202. Furthermore, the guide surfaces 202a at opposite ends of the leading edge surface 2021 may be spaced apart, or the ends of the guide surfaces 202a at opposite ends of the leading edge surface 2021 may be connected to each other.

[0070] Specifically, such as Figure 9 As shown, the first blade 202 is a backward curved blade, which can increase the air pressure of the smoke discharged from the air intake space 2011, that is, the first blade 202 has a concave part and a convex part arranged relatively to each other, and the outer surface of the concave part of the first blade 202 is the pressure surface 2025, which refers to the side that the fluid contacts when passing through the first blade 202, that is, the airflow pressure generated by the fluid on this side is greater, and 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, wherein the left and right ends of the pressure surface 2025 are respectively connected to the leading edge surface 2021 and the trailing edge surface 2022, and the left and right ends of the suction surface are also respectively connected to the leading edge surface 2021 and the trailing edge surface 2022.

[0071] like Figure 8-Figure 9 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, Figure 9 In (I), the first blade 202 has a first end surface 2023 and a second end surface 2024 that are oppositely disposed. At least one of the first end surface 2023 and the second end surface 2024 is connected to the first frame 201. The leading edge surface 2021, the first end surface 2023, the trailing edge surface 2022, and the second end surface 2024 are connected in sequence. The first reference plane is parallel to the second end surface 2024. It is understood that the first reference plane can be a plane through which the second end surface 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 9The middle (III) represents the projection shape of the first blade 202 on the first reference plane, the leading edge line 2021a and the trailing edge line 2022a are arranged obliquely relative to the air inlet space 2011, therefore, the leading edge line 2021a has a first end point E1 close to the air inlet space 2011, the trailing edge line 2022a has a second end point E2 away from the air inlet space 2011, and the length of the line connecting the first end point E1 and the second end point E2 on the orthographic projection on the first reference plane is W1. It can be understood that the orthographic projection of the pressure surface 2025 of the first blade 202 on the first reference plane has a corresponding pressure line 2025a, as shown in Figure 9 (Ⅱ), the maximum width of the first blade 202 in the direction perpendicular to the line connecting the two end points of the pressure line 2025a is W1.

[0072] Wherein, the guide flow surface 202a at the first end of the leading edge surface 2021 is the first guide flow inclined surface, the guide flow surface 202a at the second end of the leading edge surface 2021 is the second guide flow inclined surface, the second reference plane passes through the first end point E1 and the second end point E2, and the second reference plane is perpendicular to the first reference plane, Figure 9 (Ⅱ) represents the length of the orthographic projection of the guide flow inclined surface 202a1 on the first blade 202 on the second reference plane, optionally, the length of the orthographic projection of the first guide flow inclined surface on the second reference plane is W2, W2 satisfies, 0.1W1≤W2≤0.5W1; optionally, the length of the orthographic projection of the second guide flow inclined surface on the second reference plane is W3, W3 satisfies, 0.1W1≤W3≤0.5W1. The embodiment limits the size of the two guide flow surfaces 202a on the first blade 202, so that the cutting length of the guide flow surface 202a can reduce the vortex to the greatest extent.

[0073] Further, the orthographic projection of the first guide flow inclined surface and the second guide flow inclined surface on the second reference plane has a corresponding first guide flow inclined line and a second guide flow inclined line. Wherein, the length of the first guide flow inclined line is R1, and the length of the second guide flow inclined line is R2, wherein, R1≤R2.

[0074] Optionally, the first guide flow inclined line and the second guide flow inclined line can be the same, that is, the first guide flow inclined surface and the second guide flow inclined surface are the same; optionally, the length of the second guide flow inclined line is longer than the length of the first guide flow inclined line, that is, the second guide flow inclined surface is larger than the first guide flow inclined surface, so that more flue gas in the air inlet space 2011 can flow along the guide flow surface 202a to increase the air volume at the first blade 202.

[0075] In some embodiments, the first frame body 201 has two openings arranged oppositely, and the first guide slope and the second guide slope are respectively adjacent to the two different openings on the first frame body 201. When the air inlet amounts of the two openings are different, the opening with the larger air inlet amount is arranged corresponding to the guide slope with the larger normal projection length, that is, the opening with the larger air inlet amount is arranged corresponding to the second guide slope.

[0076] It should be further noted that the shell 10 of the range hood volute 100 is formed with an air inlet 105 and an air outlet 106. When the fan wheel assembly 200 is arranged in the shell 10, the opening on the first frame body 201 corresponds to the air inlet 105 on the shell 10, and the axis of the fan wheel assembly 200, that is, the axis of the first frame body 201, is collinear with the axis of the air inlet 105 on the shell 10. The centrifugal fan is installed in the first frame body 201 of the fan wheel assembly 200. When the centrifugal fan is started, the external flue gas can enter the opening and the air inlet space 2011 from the air inlet 105. At the same time, the driving motor is started, which can drive the entire fan wheel assembly 200 to rotate around the axis of the fan wheel assembly 200 in the shell. With the rotation of the fan wheel assembly 200, the first blade 202 drives the flue gas in the air inlet space 2011 to rotate to do work on the flue gas, so that the energy of the flue gas is increased, and at the same time, the flue gas is thrown to the periphery of the fan wheel assembly 200 under the action of centrifugal force and enters the air chamber 107. Then, the speed energy of the flue gas is converted into pressure energy by the shell 10, and the flue gas is discharged from the air outlet 106 on the shell 10. After the flue gas in the fan wheel assembly 200 is discharged, the pressure in the fan wheel assembly 200 is lower than the pressure at the air inlet 105 of the shell 10. Therefore, the flue gas outside the range hood volute 100 will be sucked into the fan wheel assembly 200 under the action of the pressure difference, so that the flue gas can continuously enter the fan wheel assembly 200 and be discharged through the centrifugal fan.

[0077] In the third aspect, referring to Figure 10 The oil smoke machine 2000 further includes a mounting bracket 11, which can be arranged 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 through the mounting bracket 11.

[0078] Specifically, the oil smoke machine 2000 further includes a mounting bracket 11, which can be arranged 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 through the mounting bracket 11.

[0079] In some embodiments of the present application, as Figure 10 As shown, the range hood 2000 further comprises a check valve 13 connected with the main body 300, the check valve 13 is arranged at the air outlet 106, the arrangement of the check valve 13 can make the flue gas only unidirectionally discharged from the air cavity 107 of the range hood volute 100 to the air outlet 106, and prevent the flue gas from flowing back from the air outlet 106 to the air cavity 107 and the air inlet 105.

[0080] Specifically, the main body 300 comprises a top plate 14 and a bottom plate, the top plate 14 is arranged opposite to the bottom plate, the air suction port 301 is arranged on the bottom plate, the air outlet 106 is located on the top plate 14, and the check valve 13 is installed on the top plate 14. After the installation of the range hood 2000 is completed, the bottom plate and the air suction port 301 are close to the gas stove, the top plate 14 is away from the gas stove, and the air outlet 106 is communicated to the outside of the kitchen through the check valve 13 and the flue gas pipeline, so as to suck the flue gas generated by the gas stove to the outside of the kitchen by the range hood 2000. Wherein, the working principle of the range hood 2000 has been disclosed in the related art, which will not be repeated here.

[0081] The same or similar reference numerals in the drawings of the embodiments correspond to the same or similar components; in the description of the present application, it should be understood that the orientations or positional relationships indicated by the terms "upper", "lower", "left", "right" and the like are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the components or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore the terms describing the positional relationship in the drawings are only used for exemplary illustration, and cannot be understood as a limitation on the present application, for those skilled in the art, the specific meanings of the above terms can be understood according to the specific circumstances.

[0082] The above is only a preferred embodiment of the present application, and does not limit the present application, any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A range hood volute, characterized in that: The invention comprises a housing, wherein the housing comprises: a first end plate; a second end plate, spaced apart and arranged opposite to the first end plate; a peripheral side plate, located between the first end plate and the second end plate, the peripheral side plate being connected to and perpendicular to the first end plate and the second end plate, the first end plate, the peripheral side plate and the second end plate together forming an air cavity and an air outlet, the air outlet being in communication with the air cavity, and an air inlet in communication with the air cavity being formed on the first end plate and / or the second end plate; Among them, the outer contour of the positive projection of the circumferential side panel on the first plane includes a first arc line, a avoidance line and a second arc line arranged and connected in sequence along the circumferential direction of the circumferential side panel, the first plane is perpendicular to the axial center line of the air inlet, and the curvature radius of each point on the avoidance line is greater than the curvature radius of each point on the first arc line and the second arc line.

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

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

4. The range hood volute 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; A first end of the second arc is connected to the avoidance line, and a second end of the second arc extends to an orthographic projection area of ​​the air outlet.

5. The range hood volute 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, and the two avoidance lines are respectively located on both sides of the orthographic projection area of ​​the air outlet.

6. The range hood volute 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, H<600 mm, W<600 mm; 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.

7. The range hood volute according to claim 6, characterized in that: The orthographic projection of the axis of the air inlet on the first plane is point O. The first plane has a first axis, a first reference point, and a second reference point. The first axis is parallel to the second direction and intersects point O. The first reference point and the second reference point are symmetrically distributed about the first axis. The distance between the first reference point and the second reference point is d, and 0.25H≤d≤0.5H; The first axis and the avoidance line have a first intersection point, and in the second direction, the shortest distance from the first intersection point to a straight line passing through the first reference point and the second reference point is a, 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 .

8. The range hood volute according to claim 1, characterized in that: A guide ring is provided at the air inlet, and the guide ring is provided in an arc-shaped protrusion in a direction away from the air cavity, and / or a guide structure is provided on the side of the guide ring facing the axis of the air inlet.

9. The range hood volute according to claim 1, characterized in that: 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 limiting bracket is provided at the air inlet on the second end plate.

10. A fan, characterized in that: include: The range hood volute according to any one of claims 1 to 9; and, A wind wheel assembly is arranged in the shell of the range hood volute.

11. A range hood, characterized in that: include: The fan as claimed in claim 10; and, The main body is provided with a flue and an air exhaust port connected to the flue, the flue is connected to the air inlet, the fan is arranged in the main body, the fan sucks the smoke from the air exhaust port into the flue and the air inlet, and discharges the smoke from the air outlet to the range hood.

12. The range hood according to claim 11, characterized in that: The range hood further comprises a check valve connected to the main body, the check valve being located at the air outlet and being used for allowing smoke in the range hood to be discharged from the air outlet.

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