Wind wheel assembly, fan and range hood

Abstract

The utility model discloses a wind wheel assembly, a draught fan and a range hood, the wind wheel assembly comprises a first wind wheel, the first wind wheel comprises a first frame body and a plurality of first blades, and the first blades are distributed in the circumferential direction of the first frame body at intervals to form an air inlet space; each first blade is provided with a front edge surface facing the air inlet space and a rear edge surface opposite to the air inlet space; at least one end of the front edge face is provided with a flow guide face, and the flow guide face is used for guiding smoke in the air inlet space. According to the embodiment, the flow guide faces are arranged at the end portions of the front edge faces of the blades, smoke in the air inlet space can flow along the flow guide faces at the end portions of the front edge faces, and the smoke is in smooth transition through the flow guide faces, so that the flowing rule of vortexes is destroyed, vortexes generated by the smoke at the end portions of the first blades are reduced, and airflow loss is reduced; therefore, the air guide efficiency of the first blades is improved, and the effects of reducing noise and increasing air volume are achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of kitchen appliances, and in particular to a wind wheel assembly, a fan and a range hood. BACKGROUND

[0002] The range hood is one of the essential kitchen appliances in modern families. The range hood works by using the principle of fluid dynamics and through the fan installed inside the range hood to suck and exhaust the oil fume. If the fan generates more vortexes when working, it will cause the range hood to generate more aerodynamic noise when working. CONTENT OF THE UTILITY MODEL

[0003] The wind wheel assembly, the fan and the range hood provided by the embodiments of the present application can reduce the vortex intensity and the working noise of the range hood.

[0004] The wind wheel assembly provided by the embodiments of the present application comprises:

[0005] The first wind wheel comprises a first frame body and a plurality of first blades. The plurality of first blades are distributed at intervals along the circumference of the first frame body to form an air inlet space. Each first blade has a leading edge surface facing the air inlet space and a trailing edge surface facing away from the air inlet space.

[0006] At least one end of the leading edge surface is provided with a flow guide surface. The flow guide surface is used to guide the flow of the flue gas in the air inlet space.

[0007] In some embodiments of the present application, the flow guide surface is a flow guide slope.

[0008] In some embodiments of the present application, the first blade has a first end surface between the leading edge surface and the trailing edge surface. The first end surface is connected to the first frame body. The flow guide surface is formed by one flow guide slope. The flow guide slope extends from the leading edge surface to the first end surface, and the flow guide slope and the first end surface are arranged at an included angle. Alternatively, the flow guide surface is formed by a plurality of flow guide slopes connected in sequence. The plurality of flow guide slopes are connected in sequence between the leading edge surface and the first end surface. At least two of the plurality of flow guide slopes have different inclination angles relative to the first end surface.

[0009] In some embodiments of the present application, the opposite ends of the leading edge surface are both provided with the flow guide surface.

[0010] In some embodiments of the present application, the first blade has oppositely arranged first and second end faces, at least one of which is connected to the first frame body, and the leading edge face, the first end face, the trailing edge face and the second end face are connected in sequence; the flow guide surface at the first end of the leading edge face is a first flow guide inclined surface, which extends from the leading edge face to the first end face and is arranged at an angle between the first flow guide inclined surface and the first end face; and the flow guide surface at the second end of the leading edge face is a second flow guide inclined surface, which extends from the leading edge face to the second end face and is arranged at an angle between the second flow guide inclined surface and the second end face.

[0011] In some embodiments of the present application, the leading edge face and the trailing edge face have corresponding leading edge lines and trailing edge lines in the orthogonal projection on a first reference plane, the first reference plane is parallel to the second end face, the leading edge lines have first end points close to the air inlet space, the trailing edge lines have second end points away from the air inlet space, the length of the line connecting the orthogonal projections of the first end points and the second end points on the first reference plane is W1, wherein a second reference plane passes through the first end points and the second end points, and the second reference plane is perpendicular to the first reference plane; the orthogonal projection length of the first flow guide inclined surface on the second reference plane is W2, W2 satisfies 0.1W1≤W2≤0.5W1; and / or the orthogonal projection length of the second flow guide inclined surface on the second reference plane is W3, W3 satisfies 0.1W1≤W3≤0.5W1.

[0012] In some embodiments of the present application, the first flow guide inclined surface and the second flow guide inclined surface have corresponding first flow guide inclined lines and second flow guide inclined lines in the orthogonal projection on the second reference plane; wherein the length of the first flow guide inclined line is R1, and the length of the second flow guide inclined line is R2, wherein R1≤R2.

[0013] In a second aspect, the embodiments of the present application provide a fan, which comprises a smoke machine volute and a fan wheel assembly as described in any of the above embodiments, the smoke machine volute comprises a shell body having a wind cavity, an air inlet and an air outlet communicating with the wind cavity, and the fan wheel assembly is arranged in the wind cavity.

[0014] In some embodiments of the present application, the shell comprises a first end plate, a second end plate and a peripheral side plate, the second end plate is oppositely spaced apart from the first end plate; the peripheral side plate is located between the first end plate and the second end plate, the first end plate, the peripheral side plate and the second end plate jointly enclose the air cavity and the air outlet, the first end plate and / or the second end plate is provided with the air inlet; wherein the outer contour of the peripheral side plate in the orthographic projection on the first plane comprises a first arc line, a clearance line and a second arc line arranged in sequence and connected along the peripheral direction of the peripheral side plate, the first plane is perpendicular to the axis of the air inlet, the radius of curvature of each point on the second arc line is greater than the radius of curvature of each point on the first arc line, and the radius of curvature of each point on the clearance line is greater than the radius of curvature of each point on the second arc line.

[0015] In some embodiments of the present application, the peripheral side plate is connected to and perpendicular to the first end plate and the second end plate; or, the opposite ends of the peripheral side plate are both 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 the other arc-shaped transition portion.

[0016] 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, and W < 600 mm; wherein the first direction is parallel to the axial direction of the air outlet, the second direction is perpendicular to the first direction, and the second direction is parallel to the first plane.

[0017] In some embodiments of the present application, the axis of the air inlet in the orthographic projection 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 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 clearance 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, 0.2W ≤ a ≤ 0.5W; the distance between the flow point on the clearance line and the first reference point is r1, the distance between the flow point and the second reference point is r2, (0.25d) 2 ≤ r2 × r2 ≤ (0.36d) 2 .

[0018] In some embodiments of the present application, a flow guide ring is arranged at the air inlet; the flow guide ring is arranged in an arc shape protruding towards a direction away from the air suction cavity, and / or the flow guide ring is arranged with a second flow guide structure on one side of the axial center line of the air inlet.

[0019] In a third aspect, the embodiments of the present application provide an extractor hood, comprising a main body and a fan as described in the above embodiments, the main body is provided with a flue and an air suction port 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 flue gas from the air suction port into the flue and the air inlet, and discharges the flue gas from the air outlet out of the extractor hood.

[0020] Based on the fan wheel assembly, the fan and the extractor hood in the embodiments of the present application, the fan wheel assembly in the embodiments of the present application sets a flow guide surface at the leading edge surface end of the blade, so that the flue gas in the air inlet space can flow along the flow guide surface of the leading edge surface end. Since the flue gas presents a gentle transition through the flow guide surface, the flow rule of vortex is destroyed, the vortex generated by the flue gas at the end position of the first blade is reduced, the loss of air flow is reduced, the wind guiding efficiency of the first blade is improved, and the effects of noise reduction and air volume increase are achieved. 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 also be obtained by those skilled in the art without creative labor.

[0022] Figure 1 FIG. 1 is a structural schematic diagram of a fan wheel assembly in an embodiment of the present application;

[0023] Figure 2 FIG. 2 is a structural schematic diagram of a first blade and a projection view of the first blade in a first reference plane in an embodiment of the present application;

[0024] Figure 3 FIG. 3 is a structural schematic diagram of a first blade in an embodiment of the present application;

[0025] Figure 4 FIG. 4 is a structural schematic diagram of a fan in an embodiment of the present application;

[0026] Figure 5 FIG. 5 is a sectional structural schematic diagram of a housing in an embodiment of the present application;

[0027] Figure 6 FIG. 6 is a sectional structural schematic diagram of a fan in an embodiment of the present application;

[0028] Figure 7A projection diagram of the smoke machine volute in the first plane in an embodiment of the present application;

[0029] Figure 8 A cross-sectional structure diagram of the shell in an embodiment of the present application;

[0030] Figure 9 A Cassini oval;

[0031] Figure 10 A comparison curve diagram of the air volume of the outlet of the smoke machine volute in the present application and the related art smoke machine volute;

[0032] Figure 11 A structure diagram of the smoke machine in an embodiment of the present application.

[0033] Reference signs:

[0034] 200, a wind wheel assembly; 20, a first wind wheel; 201, a first frame body; 2011, an air inlet space; 202, a first blade; 202a, a guide surface; 202a1, a guide inclined surface; 2021, a leading edge surface; 2021a, a leading edge line; 2022, a trailing edge surface; 2022a, a trailing edge line; 2023, a first end surface; 2024, a second end surface; 2025, a pressure surface; 2025a, a pressure line; 2026, a suction surface; 203, a first guide structure;

[0035] 1000, a fan; 100, a smoke machine volute; 10, a shell; 101, a first end plate; 102, a second end plate; 103, a circumferential side plate; 1031, a first arc surface; 103a, a first arc line; 1032, a position avoiding surface; 103b, a position avoiding line; 1033, a second arc surface; 103c, a second arc line; 104, an arc-shaped transition part; 105, an air inlet; 106, an air outlet; 107, a wind cavity; 24, a guide ring; 25, a second guide structure;

[0036] 2000, a smoke machine; 300, a main body; 301, an air suction port; 13, a check valve; 14, a top plate;

[0037] XX, a first direction; YY, a second direction; M, a first axis. DETAILED DESCRIPTION

[0038] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the related art, the following will be clearly and completely described 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. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the present application.

[0039] The range hood works by installing a fan inside the range hood to exhaust smoke and oil. When the fan wheel blades rotate, the fan generates a negative pressure suction force, which sucks the oil smoke below or beside the range hood into the air duct and exhausts the oil smoke in the air duct to the outdoor. When the range hood works, the rotation of the fan wheel causes the surrounding gas pulsation, which produces noise, and the fluid in the flow channel of the fan also produces noise due to vortex, which causes the range hood to produce large aerodynamic noise when it works.

[0040] To solve the above problems, in a first aspect, referring to Figure 1 , the application provides a fan wheel assembly 200, which comprises a first fan wheel 20, the first fan wheel 20 comprising a first frame body 201 and a plurality of first blades 202, the plurality of first blades 202 being spaced apart along the circumference of the first frame body 201 to form an air inlet space 2011. That is, the first frame body 201 is cylindrical, and the plurality of first blades 202 are uniformly arranged on the circumferential side of the cylindrical first frame body 201 to form the air inlet space in the middle of the cylinder. At the same time, the first frame body 201 has an opening communicating with the air inlet space 2011, and the external flue gas can enter the air inlet space 2011 through the opening.

[0041] As Figures 1-3 shown, 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 being discharged outward, the flue gas in the air inlet space 2011 first contacts the leading edge surface 2021 of the first blade 202 and then is discharged 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 guide the flue gas in the air inlet space 2011.

[0042] As can be easily understood, in the related art, the end of the blade in the fan wheel is arranged at a right angle, and when the fan wheel rotates and forms an air flow, the air flow flows through the end of the blade, and the right angle design of the end of the blade easily causes vortex phenomenon of the flue gas at the end of the blade, thereby causing adverse phenomena such as low smoke exhaust efficiency and increased noise. In the present application, 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. The arrangement of the flow guide surface 202a can change the flow path of the flue gas in the air inlet space 2011 when it passes through the flow guide surface 202a, reduce or eliminate the vortex area caused by the direct impact of the flue gas on the first blade 202. That is, since the flue gas presents a gentle transition through the flow guide surface 202a, the flow law of the vortex is destroyed, the vortex of the flue gas at the end of the first blade 202 is reduced, the loss of the air flow is reduced, and the wind guiding efficiency of the first blade 202 is improved, thereby achieving the effects of noise reduction and air volume increase.

[0043] Please refer toFigure 3 In some embodiments of the present application, 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 an inner concave part and an outer convex part arranged relatively to each other. The outer surface of the inner 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 outer convex part of the first blade 202 is the suction surface 2026, which means that the airflow pressure generated by the fluid on this side is lower.

[0044] Further, if Figure 2 As shown in (I), in some embodiments of the present application, the first blade 202 has a first end face 2023 and a second end face 2024 arranged 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 face 2021, the first end face 2023, the trailing edge face 2022 and the second end face 2024 are connected in sequence, and the guide surface 202a can be a guide slope 202a1, one end of the guide slope 202a1 is connected to the leading edge face 2021, and the other end of the guide slope 202a1 is connected to the first end face 2023, and the guide slope 202a1 and the second end face 2024 are arranged at an angle, and the angle is between 0 and 90 degrees.

[0045] Optionally, the guide surface 202a includes a guide slope 202a1, that is, the guide surface 202a is equivalent to using a line segment to cut the leading edge surface 2021 of the first blade 202, so that the guide slope 202a1 extends from the leading edge surface 2021 to the first end surface 2023, and the guide slope 202a1 and the first end surface 2023 are set at an angle, thereby allowing the flue gas in the air intake space 2011 to flow from the leading edge surface 2021 along the inclined surface of the guide slope 202a1, thereby reducing the generation of vortices in the flue gas at the end position of the first blade 202.

[0046] Optionally, the flow guide surface 202a comprises a plurality of flow guide inclined surfaces 202a1, that is, the flow guide surface 202a is equivalent to continuously cutting the leading edge surface 2021 of the first blade 202 with a plurality of line segments, so that the plurality of flow guide inclined surfaces 202a1 are sequentially connected between the leading edge surface 2021 and the first end surface 2023, and at least two of the plurality of flow guide inclined surfaces 202a1 have different inclination angles relative to the first end surface 2023. The specific processing condition can be selected according to the actual situation. For example, the flow guide surface 202a comprises two flow guide inclined surfaces 202a1, the two flow guide inclined surfaces 202a1 are sequentially connected between the leading edge surface 2021 and the first end surface 2023, and the inclination angles between the two flow guide inclined surfaces 202a1 and the first end surface 2023 are different. By arranging two flow guide inclined surfaces 202a1, a certain included angle can be formed between the two flow guide inclined surfaces 202a1 (the connection between the two flow guide inclined surfaces 202a1 is convexly arranged towards the leading edge surface 2021), and the included angles between the flow guide inclined surface 202a1 and the leading edge surface 2021 and between the flow guide inclined surface 202a1 and the first end surface 2023 are small, so that the transition of flue gas at the end position of the first blade 202 is relatively smooth.

[0047] As shown in Figure 2 (Ⅰ), in some embodiments of the present application, the opposite ends of the leading edge surface 2021 of the first blade 202 are provided with flow guide surfaces 202a, thereby further reducing the vortex generated by the flue gas in the inlet space 2011 when flowing through the first blade 202. The flow guide surfaces 202a located at the opposite ends of the leading edge surface 2021 have a certain interval therebetween; or the end portions of the flow guide surfaces 202a located at the opposite ends of the leading edge surface 2021 are connected to each other.

[0048] Specifically, as shown in Figure 2 (Ⅰ), the flow guide surface 202a located at the first end of the leading edge surface 2021 is a first flow guide inclined surface, the first flow guide inclined surface 202a1 extends from the leading edge surface 2021 to the first end surface 2023, and the first flow guide inclined surface and the first end surface 2023 are arranged at an included angle; the flow guide surface 202a located at the second end of the leading edge surface 2021 is a second flow guide inclined surface, the second flow guide inclined surface extends from the leading edge surface 2021 to the second end surface 2024, and the second flow guide inclined surface and the second end surface 2024 are arranged at an included angle. The left and right ends of the pressure surface 2025 are connected with the leading edge surface 2021 and the trailing edge surface 2022 respectively, the upper and lower ends of the pressure surface 2025 are connected with the first end surface 2023 and the second end surface 2024 respectively, the left and right ends of the suction surface 2026 are connected with the leading edge surface 2021 and the trailing edge surface 2022 respectively, and the upper and lower ends of the suction surface 2026 are connected with the first end surface 2023 and the second end surface 2024 respectively, thereby forming a three-dimensional first blade 202 structure.

[0049] It is easy to understand that the flue gas in the air inlet space 2011 can directly pass through the first guide slope and the second guide slope to exit the air inlet space 2011 when passing through the guide surface 202a, that is, the first guide slope and the second guide slope can more accurately control the flow path of the flue gas when entering the first blade 202. This streamline design helps to reduce the separation and vortex of the flue gas at the leading edge surface 2021 of the first blade 202, thereby improving the stability and uniformity of the flue gas flow.

[0050] Further, please refer to (I), (II), (III) in Figure 2 In some embodiments of the present application, the first reference plane is parallel to the second end surface 2024. It can be 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. Among them, Figure 2 (Ill) in (I), (II) 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 inclined relative to the air inlet space 2011, so the leading edge line 2021a has a first end point E1 close to the air inlet space 2011, and the trailing edge line 2022a has a second end point E2 away from the air inlet space 2011. The length of the line connecting the orthographic projection of the first end point E1 and the second end point E2 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. In the direction perpendicular to the line connecting the two end points of the pressure line 2025a, the maximum width of the first blade 202 is W1.

[0051] Among them, 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 2The length of the normal projection of the first guide slope 202a1 on the first vane 202 on the second reference plane is represented in (II). Optionally, the length of the normal projection of the first guide slope on the second reference plane is W2, and W2 satisfies 0.1W1≤W2≤0.5W1. For example, W2 can be 0.1W1, 0.2W1, 0.3W1, 0.4W1, 0.5W1, or a range formed by any two of them. Optionally, the length of the normal projection of the second guide slope on the second reference plane is W3, and W3 satisfies 0.1W1≤W3≤0.5W1. For example, W3 can be 0.1W1, 0.2W1, 0.3W1, 0.4W1, 0.5W1, or a range formed by any two of them. By limiting the size of the two guide surfaces 202a on the first vane 202, the flow path of the flue gas at the leading edge surface 2021 of the first vane 202 can be further fine-tuned, which helps to reduce separation and vortex of the flue gas at the leading edge surface 2021 of the first vane 202, thereby improving the stability and uniformity of the flue gas flow.

[0052] Further, in some embodiments of the present application, the normal projection of the first guide slope and the second guide slope on the second reference plane has corresponding first guide slope and second guide slope. The length of the first guide slope is R1, and the length of the second guide slope is R2, wherein R1≤R2.

[0053] 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. Optionally, 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 air inlet space 2011 flows along the guide surface 202a to increase the air volume at the first vane 202.

[0054] It should be noted that the first frame 201 has two openings arranged opposite to each other, and the first guide slope and the second guide slope are adjacent to the two different openings on the first frame 201. When the air inlet volume of the two openings is different, the opening with larger air inlet volume is arranged corresponding to the guide slope with larger normal projection length, that is, the opening with larger air inlet volume is arranged corresponding to the second guide slope.

[0055] Please refer to Figure 3In some embodiments of the present application, the first guide structure 203 is arranged on at least one of the front edge surface 2021 and the rear edge surface 2022, and extends along the axial direction of the first wind wheel 20. The first guide structure 203 can be arranged to guide the flue gas in the air inlet space 2011. The first guide structure 203 can be a sawtooth structure. For example, the sawtooth first guide structure 203 arranged on the rear edge surface 2022 can break the flow rule of the vortex, thereby weakening or even eliminating the vortex phenomenon, achieving the effect of reducing noise and increasing air volume.

[0056] In a second aspect, referring to Figures 4-5 The present application also provides a fan 1000, which comprises a smoke machine volute 100 and the wind wheel assembly 200 as described in any of the above embodiments. The smoke machine volute 100 comprises a shell 10 having a wind cavity 107, an air inlet 105 and an air outlet 106 communicating with the wind cavity 107. The wind wheel assembly 200 is arranged in the wind cavity 107.

[0057] It should be noted that the air inlet 105 and the air outlet 106 are formed on the shell 10 of the smoke machine volute 100. When the wind 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 wind wheel assembly 200, i.e. 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 1000 is installed in the first frame body 201 of the wind wheel assembly 200. When the centrifugal fan 1000 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 wind wheel assembly 200 to rotate around the axis of the wind wheel assembly 200 in the shell 10. With the rotation of the wind wheel assembly 200, the first blade 202 drives the flue gas in the air inlet space 2011 to rotate, so as to do work on the flue gas and increase the energy of the flue gas. At the same time, the flue gas is thrown out to the periphery of the wind wheel assembly 200 under the action of centrifugal force and enters the wind cavity 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 wind wheel assembly 200 is discharged, the pressure in the wind wheel assembly 200 is lower than the pressure at the air inlet 105 of the shell 10. Therefore, the flue gas outside the smoke machine volute 100 is sucked into the wind wheel assembly 200 under the action of the pressure difference, so that the flue gas can continuously enter the wind wheel assembly 200 and be discharged by the centrifugal fan 1000.

[0058] In a second aspect, referring to Figures 4-5In some embodiments of the present application, the shell 10 comprises a first end plate 101, a second end plate 102, and a peripheral side plate 103. The first end plate 101 is oppositely spaced apart from the second end plate 102, and the peripheral side plate 103 is located between the first end plate 101 and the second end plate 102. The peripheral side plate 103, together with the first end plate 101 and the second end plate 102, encloses a wind cavity 107 and an air outlet 106. The first end plate 101 and / or the second end plate 102 is / are provided with an air inlet 105. The shell 10 can be provided with one air inlet 105 that is in communication with the wind cavity 107, i.e., the air inlet mode of the range hood volute 100 is single-sided air inlet. Alternatively, the first end plate 101 and the second end plate 102 are both provided with air inlets 105 that are in communication with the wind cavity 107, i.e., the air inlet mode of the range hood volute 100 is double-sided air inlet. The flue gas can be sucked into the wind cavity 107 through the air inlets 105 on the shell 10 under the action of the centrifugal fan 1000, and then discharged from the air outlet 106.

[0059] The outer contour of the normal projection of the peripheral side plate 103 on the first plane comprises a first arc line 103a, a clearance line 103b, and a second arc line 103c arranged in sequence along the peripheral direction of the peripheral side plate 103 and connected to each other. For example, the first arc line 103a and the second arc line 103c are dashed lines, and the clearance line 103b is a solid line. Figure 7 The first plane is perpendicular to the axis of the air inlet 105. The radius of curvature of each part of the second arc line 103c is greater than the radius of curvature of each part of the first arc line 103a. The bending degree of the second arc line 103c is smaller than the bending degree of the first arc line 103a, and the second arc line 103c is smoother than the first arc line 103a. The radius of curvature of each part of the clearance line 103b is greater than the radius of curvature of each part of the second arc line 103c. It can be understood that the radius of curvature of each part of the clearance line 103b is the largest compared with the first arc line 103a and the second arc line 103c, that is, the bending degree of the clearance line 103b is smaller than the bending degree of the first arc line 103a and the second arc line 103c, and the clearance line 103b is smoother (closer to a straight line) as a whole.

[0060] Specifically, as shown in Figures 6-7As shown, the outer circumferential surface of the circumferential plate 103 includes a first arc surface 1031, a clearance surface 1032 and a second arc surface 1033 arranged in sequence along the circumferential direction of the circumferential plate 103 and connected with each other, two ends of the clearance surface 1032 are connected with 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 clearance surface 1032 on the first plane corresponds to the clearance line 103b, and the orthographic projection of the second arc surface 1033 on the first plane corresponds to the second arc line 103c. The clearance line 103b is an arc transition line between the first arc line 103a and the second arc line 103c, that is, the clearance surface 1032 and the first arc surface 1031 and the second arc surface 1033 are arc surface transitions. Compared with two plane transitions with an included angle, the arc surface transition can prevent the existence of sharp corners at the connection of two surfaces, and the arc surface transition is more in line with the flow mode of the airflow, which can reduce the backflow and vortex phenomenon of the flue gas caused by sharp corners (such as right angles, acute angles or obtuse angles).

[0061] 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. Since the radius of curvature of the clearance line 103b is the largest compared with the first arc line 103a and the second arc line 103c, the clearance line 103b is smoother than the first arc line 103a and the second arc line 103c. If the side of the range hood volute 100 has an area exceeding the installation space, the outer contour of the orthographic projection of the side of the range hood volute 100 on the first plane can be set as the shape of the clearance line 103b, thereby reducing the protrusion height of the side of the range hood volute 100, reducing the volume of the range hood volute 100, and improving the flow of flue gas at the clearance surface 1032 of the range hood volute 100, reducing the backflow and vortex phenomenon of the flue gas at the clearance surface 1032 of the range hood volute 100, and reducing the noise generated by the range hood volute 100 when sucking smoke.

[0062] Please refer to Figure 5In some embodiments of the present application, the peripheral side plate 103 is connected and perpendicular to the first end plate 101 and the second end plate 102, and specifically, the connection between the peripheral side plate 103 and the first end plate 101 and the second end plate 102 is 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 flat plate structures, and the peripheral side plate 103 can be formed by bending a long strip-shaped flat plate structure along its length direction. The side of the flat plate structure can be directly connected to the side of the peripheral side plate 103 in the width direction. Thus, not only the mold opening cost of the range hood volute 100 can be reduced, but also the manufacturing difficulty of the range hood volute 100 can be reduced, thereby facilitating the batch production of the range hood volute 100.

[0063] Alternatively, please refer to Figure 8 In some embodiments, the opposite 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 one 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. Thus, the two end plates and the peripheral side plate 103 are connected in an arc surface transition manner. The arc surface transition is different from the right angle transition. For example, the right angle design in the volute is easy to cause the backflow and vortex phenomenon of the flue gas in the volute, thereby causing the low efficiency of the oil smoke suction, the increase of the noise and other adverse phenomena. The arc surface transition manner in the present application can avoid the sharp corners at the connection between the two surfaces, and is more in line with the flow manner of the airflow, thereby avoiding the sharp corners and reducing the loss of the airflow and improving the efficiency. Therefore, the arc-shaped transition portion 104 is arranged to connect the end plate and the peripheral side plate 103, thereby reducing the backflow and vortex of the flue gas in the range hood volute 100.

[0064] Please refer to Figure 6 In 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 < 600 mm, and W < 600 mm. The first direction XX is parallel to the first plane and the axial direction of the air outlet 106, and the second direction YY is perpendicular to the first direction XX and parallel to the first plane.

[0065] Further, please refer to Figure 7In some embodiments of the present application, the axis 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 the 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.

[0066] It is easy to understand that in the first plane, the projections of the first reference point C1 and the second reference point C2 are both inside the projection of the first end plate 101, taking the first axis M as the x-axis and the straight line perpendicular to the first axis M and passing through the first intersection point Q as the y-axis, the coordinates of the first intersection point 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.

[0067] Wherein, any point on the avoidance line 103b is taken as a flow point P, the distance between the flow point P and the first reference point C1 is r1, 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.

[0068] It should be noted that, Figure 9 is a complete curve of Cassini oval, and the curve equation of Cassini oval is:

[0069] (x 2 +y 2 ) 2 -2b(x 2 -y 2 )=b 4 -c 4 (wherein, b, c are constants).

[0070] In the first plane, taking the first axis M as the x-axis and the straight line passing through the first reference point C1 and the second reference point C2 as the y-axis, at this time the coordinates of the first reference point C1 are (0, 0.5d), the coordinates of the second reference point C2 are (0, -0.5d), wherein d is a constant, and the coordinates of the flow point P are (x1, y1), because r1×r2=k2 So The equation is simplified as follows:

[0071] (x 2 +y 2 ) 2 -0.5d(x 2 -y 2 )=k 4 -(0.5d) 4 ;

[0072] As can be seen from the above, 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 of the Cassini oval, so that the flue gas flows more uniformly at the avoidance surface 1032 of the smoke machine volute 100, the speed gradient and vortex intensity of the flue gas can be reduced, the turbulent kinetic energy at the avoidance surface 1032 is reduced, the flow uniformity is improved, and the aerodynamic noise of the smoke machine volute 100 can be reduced.

[0073] It should be further pointed out that, taking the example that the circumferential side plate in the smoke machine volute 100 is vertically arranged with the first end plate and the second end plate, Figure 10 Fig. 6 is a comparison curve diagram of the air volume of the air outlet 106 of the smoke machine volute 100 in the related art and the smoke machine volute 100 in the present application, in which Figure 10 In Fig. 6, the abscissa represents time, and the ordinate represents the air volume of the air outlet 106. The solid line in the figure represents the air volume of the air outlet 106 of the smoke machine volute 100 in the present application at different times, and the dashed line represents the air volume of the air outlet 106 of the smoke machine volute 100 in the related art at different times, Figure 10 The comparison curve diagram of the air volume of the air outlet 106 of the smoke machine volute 100 in the present application and the air volume of the air outlet 106 of the smoke machine volute 100 in the related art indicates that the air volume of the air outlet 106 of the smoke machine volute 100 in the present application is larger than that of the smoke machine volute 100 in the related art, which means that the smoke machine volute 100 in the present embodiment has a larger air volume, which is more conducive to the discharge of flue gas.

[0074]

[0075] The above table is a comparison table of the working noise test of the smoke machine volute 100 in the related art and the smoke machine volute 100 in the present application. Under the working conditions in the above table, the working noise of the range hood 2000 provided with the smoke machine volute 100 in the present application is 61.2 dB(A), which is 2.3 dB(A) lower than that of the range hood 2000 provided with the smoke machine volute 100 in the related art. In the case of half-muffled high wind, the working noise of the range hood 2000 provided with the smoke machine volute 100 in the present application is 51.3 dB(A), which is 4.2 dB(A) lower than that of the range hood 2000 provided with the smoke machine volute 100 in the related art. Therefore, it is indicated that the noise generated by the smoke machine volute 100 in the present embodiment is smaller.

[0076] Please refer to Figure 5 or Figure 8 In some embodiments of the present application, the range hood volute 100 further comprises a flow guide ring 24, which is arranged at the air inlet 105 to guide the flue gas. The flow guide ring 24 is arranged in an arc shape protruding towards the direction away from the suction cavity 107, which is conducive to the external flue gas entering the air cavity 107 from the air inlet 105 along the arc-shaped protruding surface of the flow guide ring 24.

[0077] In some embodiments, as shown in Figure 5 or Figure 8 , the flow guide ring 24 is provided with a second 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 port 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 second flow guide structure 25 is arranged at the second end of the flow guide ring 24 to guide the external flue gas. Among them, the second flow guide structure 25 can be a sawtooth structure or an inclined surface structure, taking the example that the sawtooth structure is arranged on one side of the flow guide ring 24 towards the axis of the air inlet 105, the sawtooth structure can destroy the flow rule of the vortex, thereby weakening or even eliminating the vortex phenomenon, achieving the effect of reducing noise and improving air volume.

[0078] Or, as shown in Figure 5 or Figure 8 , the flow guide ring 24 can be arranged in an arc shape protruding towards the direction away from the suction cavity 107, and the second end of the flow guide ring 24 is provided with a second flow guide structure 25 to further guide the external flue gas, so that more external flue gas can enter the air cavity 107 along the flow guide ring 24.

[0079] Thirdly, please refer to Figure 11 , the present application also provides a range hood 2000, which comprises 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 air outlet 301 communicating with the flue 301. The flue 301 communicates with the air inlet 105, and the air outlet 106 communicates with the outside of the main body 300. The fan 1000 is arranged in the main body 300. The fan 1000 sucks the flue gas from the air outlet 301 into the flue 301 and the air inlet 105, and discharges the flue gas from the air outlet 106 of the range hood 2000.

[0080] Specifically, the range hood 2000 further comprises 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.

[0081] It should be noted that 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 discharge from the air cavity 107 of the smoke machine 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. 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 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 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.

[0082] 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 of the present application, for those skilled in the art, the specific meanings of the above terms can be understood according to the specific circumstances.

[0083] The above is only the 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 wind wheel assembly, characterized in that: include: a first wind wheel comprising a first frame and a plurality of first blades, wherein the plurality of first blades are spaced apart along the circumference of the first frame to form an air inlet space, and each first blade has a leading edge surface facing the air inlet space and a trailing edge surface facing away from the air inlet space; Wherein, at least one end of the leading edge surface is provided with a guide surface, and the guide surface is used to guide the smoke in the air intake space.

2. The wind wheel assembly according to claim 1, characterized in that: The guide surface is a guide slope.

3. The wind wheel assembly according to claim 1, characterized in that: The first blade has a first end surface located between the leading edge surface and the trailing edge surface, and the first end surface is connected to the first frame; The guide surface is formed by a guide slope, the guide slope extends from the leading edge surface to the first end surface, and the guide slope is arranged at an angle to the first end surface; or, The guide surface is formed by connecting a plurality of guide slopes in sequence, wherein the plurality of guide slopes are connected in sequence between the leading edge surface and the first end surface, and at least two of the plurality of guide slopes have different inclination angles relative to the first end surface.

4. The wind wheel assembly according to claim 1, characterized in that: The guide surfaces are provided at opposite ends of the leading edge surface.

5. The wind wheel assembly according to claim 4, characterized in that: The first blade has a first end surface and a second end surface that are opposite to each other, at least one of the first end surface and the second end surface is connected to the first frame, and the leading edge surface, the first end surface, the trailing edge surface and the second end surface are connected in sequence; The guide surface located at the first end of the leading edge surface is a first guide slope, the first guide slope extends from the leading edge surface to the first end surface, and the first guide slope is arranged at an angle to the first end surface; The guide surface located at the second end of the leading edge surface is a second guide slope, the second guide slope extends from the leading edge surface to the second end surface, and the second guide slope is arranged at an angle to the second end surface.

6. The wind wheel assembly according to claim 5, characterized in that: The orthographic projections of the leading edge surface and the trailing edge surface on a first reference plane have corresponding leading edge lines and trailing edge lines, the first reference plane is parallel to the second end surface, the leading edge line has a first endpoint close to the air intake space, the trailing edge line has a second endpoint away from the air intake space, and the length of a line connecting the orthographic projections of the first endpoint and the second endpoint on the first reference plane is W1, wherein a second reference plane passes through the first endpoint and the second endpoint, and the second reference plane is perpendicular to the first reference plane; The orthographic projection length of the first guide slope on the second reference plane is W2, and W2 satisfies 0.1W1≤W2≤0.5W1; and / or, The orthographic projection length of the second guide slope on the second reference plane is W3, and W3 satisfies 0.1W1≤W3≤0.5W1.

7. The wind wheel assembly according to claim 6, characterized in that: The orthographic projections of the first guide slope and the second guide slope on the second reference plane have corresponding first guide oblique lines and second guide oblique lines; The length of the first diagonal guiding line is R1, and the length of the second diagonal guiding line is R2, wherein R1≤R2.

8. The wind wheel assembly according to claim 1, characterized in that: The first blade is a backward curved blade.

9. The wind wheel assembly according to claim 1, characterized in that: A first flow guiding structure is provided on at least one of the leading edge surface and the trailing edge surface, and the first flow guiding structure extends along the axial direction of the first wind wheel.

10. A fan, characterized in that: include: The wind wheel assembly according to any one of claims 1 to 9; and, The range hood volute comprises a shell having an air cavity and an air inlet and an air outlet communicated with the air cavity, and the wind wheel assembly is arranged in the air cavity.

11. The fan according to claim 10, characterized in that 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, wherein the first end plate, the peripheral side plate, and the second end plate together form the air cavity and the air outlet, and the first end plate and / or the second end plate are provided with the air inlet; Among them, the outer contour of the positive projection of the circumferential side panel on the first plane includes a first arc, a avoidance line and a second arc arranged in sequence and connected along the circumferential direction of the circumferential side panel, the first plane is perpendicular to the axial center line of the air inlet, 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.

12. The fan according to claim 11, characterized in that The peripheral side plate is connected to the first end plate and the second end plate and is perpendicular to the first end plate; or, The opposite ends of the peripheral side plate are both provided with arc-shaped transition parts, the first end of the peripheral side plate is connected to the first end plate through one of the arc-shaped transition parts, and the second end of the peripheral side plate is connected to the second end plate through another of the arc-shaped transition parts.

13. The fan according to claim 11, 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 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.

14. The fan according to claim 13, 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 .

15. The fan according to claim 10, characterized in that A guide ring is provided at the air inlet; The guide ring is provided with an arc-shaped protrusion in a direction away from the air suction chamber, and / or a second guide structure is provided on the side of the guide ring facing the axis of the air inlet.

16. A range hood, characterized in that: include: The fan according to any one of claims 10 to 15; 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 of the shell, 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.

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