Wind wheel assembly, fan and range hood

Abstract

The embodiment of the utility model provides a wind wheel assembly, a draught fan and a range hood, and relates to the technical field of kitchen wares, a first wind wheel is arranged, 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; the smoke in the air inlet space can flow along the flow guide arc face at the end of the front edge face, the possibility that the smoke generates vortexes at the end of the first blade is reduced, and therefore airflow loss is reduced, and noise can be lowered.

Description

TECHNICAL FIELD

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

[0002] The range hood has become a necessary household appliance in the kitchen, which can absorb the oil fume during cooking and effectively lead it outside, so that the kitchen is free from the trouble of oil fume. When the range hood absorbs the oil fume, the oil fume will collide with the fan blades when passing through the fan blades, which will produce a large noise. CONTENT

[0003] The present application provides a wind wheel assembly, a fan and a range hood, which can atomize the residual water in the water cup by the atomizing device and discharge it outside the cooking device, thereby reducing the probability of breeding bacteria by the residual water.

[0004] The present application provides a wind wheel assembly, which comprises:

[0005] A first wind wheel, comprising a first frame body and a plurality of first blades, the plurality of first blades are spaced apart 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] Wherein, at least one end of the leading edge surface is provided with a flow guide arc surface, and the flow guide arc surface is recessed towards the trailing edge surface.

[0007] Further, both ends of the leading edge surface are provided with the flow guide arc surface.

[0008] Further, the flow guide arc surface at one end of the leading edge surface is a first flow guide arc surface, and the flow guide arc surface at the other end of the leading edge surface is a second flow guide arc surface, the first flow guide arc surface extends from the leading edge surface to a first end surface of the first blade, and the second flow guide arc surface extends from the leading edge surface to a second end surface of the first blade.

[0009] Further, the leading edge surface and the trailing edge surface have corresponding first leading edge lines and first trailing edge lines in the orthogonal projection on the plane passing through the second end surface, the connecting line of one end of the first leading edge line facing the air inlet space and one end of the second leading edge line facing the air inlet space is parallel to a reference plane, and the reference plane is perpendicular to the second end surface.

[0010] The distance between the two ends of the first flow guide arc surface in the projection on the vertical plane in the extension direction of the connecting line is W2, and the W2 satisfies 0.1W1≤W2≤0.5W1.

[0011] And / or, the distance between the projections of the two ends of the second guide arc surface on the vertical plane along the extension direction of the connecting line is W3, and the W3 satisfies 0.1W1≤W3≤0.5W1.

[0012] And / or, the first blade has a first guide arc line corresponding to the first guide arc surface in the vertical projection, and the length of the first guide arc line is R1; the first blade has a second guide arc line corresponding to the second guide arc surface in the vertical projection, and the length of the second guide arc line is R2, wherein R2≤R1.

[0013] Further, the first blade is a backward-curved blade.

[0014] Further, at least one of the trailing edge surface and the leading edge surface of the first blade is provided with a first guide structure extending along the axial direction of the first wind wheel.

[0015] The second aspect of the present application provides a fan, comprising:

[0016] The wind wheel assembly described above; and

[0017] The range hood volute, the shell assembly comprises a shell, the shell has a wind cavity, and an air inlet and an air outlet in communication with the wind cavity;

[0018] The wind wheel assembly is arranged in the wind cavity.

[0019] Further, the shell comprises:

[0020] A first end plate;

[0021] A second end plate is arranged in spaced relation to the first end plate;

[0022] A peripheral side plate is located between the first end plate and the second end plate, and the first end plate and / or the second end plate is / are provided with an air inlet in communication with the wind cavity;

[0023] The outer contour of the orthographic projection of the peripheral side plate on the first plane comprises a first arc line, a clearance line and a second arc line arranged in sequence and connected along the circumferential direction of the peripheral side plate, the first plane is perpendicular to the axis of the air inlet, and the curvature radius of each part of the clearance line is greater than the curvature radius of each part of the first arc line and the second arc line.

[0024] Further, 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<600mm, and W<600mm.

[0025] 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.

[0026] Further, the axial center line of the air inlet projects onto the first plane as 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.

[0027] 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.

[0028] The distance between the flow point on the avoidance line and the first reference point is r1, the distance between the flow point and the second reference point is r2, (0.25d) 2 ≤r1*r2≤(0.36d) 2 .

[0029] Further, a flow guide ring is arranged at the air inlet.

[0030] The flow guide ring is arranged in an arc shape protruding away from the air cavity, and / or the flow guide ring is provided with a second flow guide structure on one side of the axial center line of the air inlet.

[0031] Further, the shell further comprises an arc-shaped transition portion, one end of the peripheral side plate is connected to the first end plate through the arc-shaped transition portion, and the other end of the peripheral side plate is connected to the second end plate through the arc-shaped transition portion.

[0032] Or, the peripheral side plate is connected to the first end plate and the second end plate perpendicularly.

[0033] The third aspect of the present application provides an oil fume extractor, comprising:

[0034] a main body, the main body is provided with an air suction port, and the main body is provided with a flue connected to the air suction port; and

[0035] The fan in the above is arranged in the main body, and the fan sucks flue gas from the air suction port into the flue.

[0036] The wind wheel assembly, the fan and the extractor hood provided by the embodiment of the application have the following beneficial effects. The first wind wheel is arranged, the first wind wheel comprises a first frame body and a plurality of first blades, and the plurality of first blades form an air inlet space. In this way, the flue gas in the air inlet space can flow along the flow guide camber surface at the end of the leading edge surface, the possibility of vortex generated by the flue gas at the end of the first blade is reduced, the loss of airflow is reduced, and the noise can be reduced. BRIEF DESCRIPTION OF DRAWINGS

[0037] In order to more clearly illustrate the technical solutions of 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. 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 effort on the basis of these drawings.

[0038] Figure 1 The structure schematic diagram of the extractor hood in an embodiment of the present application is shown in FIG. 1.

[0039] Figure 2 The structure schematic diagram of the fan in an embodiment of the present application is shown in FIG. 2.

[0040] Figure 3 The structure schematic diagram of the first wind wheel in an embodiment of the present application is shown in FIG. 3.

[0041] Figure 4 The structure schematic diagram of the first blade and the projection view of the first blade on the reference plane in an embodiment of the present application are shown in FIG. 4.

[0042] Figure 5 The projection view of the first blade on the first end surface in an embodiment of the present application is shown in FIG. 5.

[0043] Figure 6 The first view structure schematic diagram of the extractor hood in an embodiment of the present application is shown in FIG. 6.

[0044] Figure 7 The second view structure schematic diagram of the extractor hood in an embodiment of the present application is shown in FIG. 7.

[0045] Figure 8 The cross-sectional structure schematic diagram of the extractor hood in an embodiment of the present application is shown in FIG. 8.

[0046] Figure 9 The third view structure schematic diagram of the extractor hood in an embodiment of the present application is shown in FIG. 9.

[0047] Figure 10 The projection schematic diagram of the extractor hood on the first plane in an embodiment of the present application is shown in FIG. 10.

[0048] Figure 11 The Cassini oval is shown in FIG. 11.

[0049] Figure 12 Figure 1 is a comparison curve diagram of the air volume of the air outlet of the oil fume exhaust fan of the present application and the air volume of the air outlet of the related art oil fume exhaust fan. BRIEF DESCRIPTION OF DRAWINGS

[0051] 100, oil fume exhaust fan volute; 10, shell;

[0052] 101, first end plate;

[0053] 102, second end plate;

[0054] 103, peripheral side plate; 1031, first arc surface; 103a, first arc line; 1032, avoidance surface; 103b, avoidance line; 1033, second arc surface; 103c, second arc line;

[0055] 105, air inlet;

[0056] 106, air outlet;

[0057] 107, air cavity;

[0058] 24, flow guide ring; 25, second flow guide structure; 12, limiting support;

[0059] 1000, fan; 200, wind wheel assembly; 20, first wind wheel; 201, first frame body; 2011, air inlet space; 202, first blade; 202a2, flow guide arc 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; 203, first flow guide structure;

[0060] 2000, oil fume exhaust fan; 300, main body; 301, air suction port; 11, mounting support; 13, check valve; 14, top plate;

[0061] XX, first direction; YY, second direction; M, first axis. DETAILED DESCRIPTION

[0062] In order to make the purpose, technical scheme and advantages of the present application more clear, the present application is further described in detail below in combination with the drawings and examples. It should be understood that the specific examples described herein are only used to explain the present application and do not limit the present application.

[0063] With the improvement of people's material living standard, the demand for cooking process free from oil fume invasion is increasing, and the oil fume exhaust fan gradually becomes an essential household electrical appliance for purifying the kitchen environment. The oil fume exhaust fan is used to suck the oil fume and water vapor mixture generated in the cooking process into the fan, and discharge the oil fume and water vapor mixture through the air pressure generated by the fan.

[0064] As an essential electrical appliance in the kitchen, the noise generated during the operation of the range hood is an important issue that needs attention. The main reasons for controlling the noise of the range hood are as follows:

[0065] With the improvement of living standards, people's requirements for living environment are also getting higher and higher. Reducing the noise emission of household appliances helps to create a more quiet and comfortable home environment and reduce noise pollution;

[0066] In the environment of fierce market competition, the performance, quality, appearance and user experience of products are the key factors that determine the competitiveness of products. Controlling noise as an important aspect of improving user experience helps to improve the market competitiveness of products.

[0067] In the related art, when the range hood absorbs oil fume, the oil fume will collide with the fan blade when it is discharged through the fan blade, which will generate a large noise and affect the user experience.

[0068] To solve the above problems, please refer to Figure 1 The present application provides a range hood 2000, which comprises a main body 300 and a fan 1000. The main body 300 serves as an outer protective member of the range hood 2000 to bear and fix the fan 1000 and other components. The material of the main body 300 can be metal, including but not limited to stainless steel and aluminum, etc. The present application does not limit this. When the material of the main body 300 is stainless steel, it has the advantages of high strength, high temperature resistance, environmental protection and health, etc.

[0069] Specifically, the range hood 2000 further comprises a mounting bracket 11, which can be arranged between the end plate of the hood volute 100 and the main body 300. The mounting bracket 11 fixes the hood volute 100 on the main body 300.

[0070] In some embodiments of the present application, as shown in the figure, 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 of the hood volute 100 to the air outlet 106, preventing the flue gas from flowing back from the air outlet 106 to the air cavity and the air inlet 105.

[0071] Specifically, the main body 300 includes 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 arranged on the top plate 14, and the check valve 13 is arranged 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 that the range hood 2000 can suck the flue gas generated by the gas stove to the outside of the kitchen. The working principle of the range hood 2000 has been disclosed in the related art, and details are not repeated here.

[0072] The fan 1000 is used to generate a negative pressure suction force, and the flue gas below or on the side of the range hood 2000 is sucked into the main body 300 through the air suction port 301. The main body 300 has a flue connected with the air suction port 301. When the flue gas enters the main body 300, the flue gas enters the flue under the action of the negative pressure suction force of the fan 1000, and is discharged to the outdoor or the flue gas pipeline through the flue.

[0073] The fan 1000 can be an axial fan, a cross-flow fan and a centrifugal fan. In the embodiment of the application, the fan 1000 is a centrifugal fan, and a multi-blade centrifugal fan is exemplarily described.

[0074] Specifically, referring to Figure 2 , the fan 1000 includes a fan wheel assembly 200 and a range hood volute 100. The range hood volute 100 includes a housing 10, the housing 10 forms a wind cavity 107, an air inlet 105 and an air outlet 106 which are communicated with the wind cavity 107, and the fan wheel assembly 200 is arranged in the wind cavity 107. The housing 10 is an appearance component of the entire fan 1000, which can protect the fan wheel assembly 200 and reduce the probability of contact between foreign matters and the fan wheel assembly 200. In addition, the housing 10 can guide the airflow, so that the flue gas entering the main body 300 enters the wind cavity through the air inlet 105, and then is discharged through the air outlet 106 after the operation of the fan wheel assembly 200. The air outlet 106 is communicated with the flue, so that the flue gas is finally discharged to the outdoor or the flue gas pipeline through the flue.

[0075] In the embodiment of the application, referring to Figure 3 , the fan wheel assembly 200 includes a first fan wheel 20, the first fan wheel 20 includes 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, and at least one end of the leading edge surface 2021 is provided with a flow guide arc surface 202a2 which is recessed towards the trailing edge surface 2022.

[0076] When the wind wheel assembly 200 rotates, the flue gas entering through the air inlet 105 enters the air inlet space 2011 and flows from the leading edge surface 2021 to the trailing edge surface 2022 of the wind wheel assembly 200. In this process, the flue gas in the air inlet space 2011 can flow along the guide arc surface 202a2 at the end of the leading edge surface 2021, so that the flue gas flows more smoothly through the blades, reducing the possibility of vortex at the end of the first blade 202, thereby reducing airflow loss and noise.

[0077] It can be understood that the centrifugal fan can adopt single-sided air inlet or double-sided air inlet. In order to improve the air suction volume and air suction efficiency, in the embodiment of the present application, double air inlets are adopted, that is, the two air inlets 105 are symmetrically distributed on both sides of the shell 10 along the axial direction of the first wind wheel 20. Please refer to Figures 6-7 That is, the two air inlets 105 are respectively located on both sides of the shell 10 along the axial direction of the first wind wheel 20 and are opposite to the air inlet space 2011.

[0078] Based on the fact that the centrifugal fan 1000 adopts a double-sided air inlet mode, please refer to Figures 4-5 Therefore, the guide arc surface 202a2 is arranged at both ends of the leading edge surface 2021 of the first blade 202. The airflow sucked in through the air inlet 105 changes the flow path when passing through the guide arc surface 202a2, thereby reducing or eliminating the vortex area caused by the direct impact of the airflow on the first blade 202 at the air inlet 105.

[0079] The guide arc surface 202a2 at one end is a first guide arc surface, and the guide arc surface 202a2 at the other end is a second guide arc surface. The first guide arc surface extends from the leading edge surface 2021 to a first end surface 2023 of the first blade 202, and the second guide arc surface extends from the leading edge surface 2021 to a second end surface 2024 of the first blade 202. In the embodiment of the present application, the first end surface 2023 and the second end surface 2024 are end surfaces distributed at both ends of the first blade 202 along the length direction of the first blade 202. The first end surface 2023 faces one air inlet 105 of the shell 10, and the second end surface 2024 faces the other air inlet 105 of the shell 10.

[0080] It should be understood that in some embodiments, the leading edge surface and the trailing edge surface of the first blade 202 can be arc surfaces. Therefore, the leading edge line 2021a and the trailing edge line 2022a of the normal projection on the plane passing through the second end surface 2024 are arc lines. At this time, the line connecting the end of the leading edge line 2021a facing the air inlet space 2011 and the end of the trailing edge line 2022a facing the air inlet space 2011 is the line connecting the vertex of the leading edge line 2021a and the vertex of the trailing edge line 2022a.

[0081] It can be understood that the first guide arc surface and the second guide arc surface can be a segment of arc surface or composed of multiple segments of arc surface, and the specific case is subject to the convenience of actual processing, and no specific limitation is made in the embodiments of the present application.

[0082] In addition, it can be understood that the first impeller 20 is driven to rotate by the motor, and in order to reduce the part occupied by the motor drive in the air inlet space 2011, that is, not to affect the air inlet of the wind wheel assembly 200, generally, the motor is arranged on one side of the entire shell 10 along the extension direction of the first wind wheel 20 axis. In this way, the arrangement of the motor and the first frame body 201 will affect the air inlet amount of the adjacent air inlet 105, and the air inlet amount is small.

[0083] The first frame body 201 generally includes an upper disc, a lower disc and a middle disc, the upper disc is located at one end face of the plurality of first blades 202, the lower disc is located at the other end face of the plurality of first blades 202, and the middle disc is located between the upper disc and the lower disc. The upper disc, the lower disc and the middle disc are all used to connect the plurality of first blades 202 together, wherein the lower disc is generally adjacent to the motor, and in order to ensure that the air inlet space 2011 has a larger volume, the middle disc is also designed adjacent to the lower disc, as shown in Figure 3 As the middle disc is adjacent to the lower disc, it may affect the design of the guide arc surface 202a2 of the first blade 202 adjacent to the lower disc. In the embodiments of the present application, the air inlet 105 on the side away from the motor is taken as the first air inlet, the air inlet 105 on the side adjacent to the motor is taken as the second air inlet, and the guide arc surface 202a2 corresponding to the first air inlet is taken as the first guide arc surface, and the guide arc surface 202a2 corresponding to the second air inlet is taken as the second guide arc surface.

[0084] Please refer back to Figures 4-5 The front edge surface 2021 and the rear edge surface 2022 have corresponding front edge lines 2021a and rear edge lines 2022a in the orthogonal projection on the plane of the second end face 2024, the line connecting the one end of the front edge line 2021a toward the air inlet space 2011 and the one end of the rear edge line 2022a toward the air inlet space 2011 is parallel to the reference plane, the reference plane is perpendicular to the second end face 2024, and the projection of the one end of the front edge line 2021a away from the air inlet space 2011 and the one end of the rear edge line 2022a away from the air inlet space 2011 on the reference plane extends along the direction of the line at a distance W1.

[0085] The projection of the two ends of the first guide arc surface on the reference plane extends along the direction of the line at a distance W2, and W2 satisfies 0.1W1≤W2≤0.5W1, W2 can be 0.1W1, 0.2W1, 0.3W1, 0.4W1, 0.5W1 or a range composed of any two of them.

[0086] The distance between the projections of the two ends of the second guide arc surface on the reference plane along the extension direction of the connecting line is W3, W3 satisfies 0.1W1≤W3≤0.5W1, W3 can be 0.1W1, 0.2W1, 0.3W1, 0.4W1, 0.5W1, or a range formed by any two of them.

[0087] In this way, by accurately controlling the ratio of W2 and W3 to W1, the flow path of the air flow at the leading edge of the first blade 202 can be further fine-tuned. This fine-tuning helps to reduce the separation and vortex generation of the air flow at the leading edge of the first blade 202, thereby improving the stability and uniformity of the air flow.

[0088] Reasonable values of W2 and W3 can reduce the stress concentration phenomenon of the first blade 202 edge caused by air flow impact, reduce the fatigue damage risk of the first blade 202, thereby helping to prolong the service life of the first blade 202 and improve the reliability and durability of the fan 1000.

[0089] It should be understood that in some embodiments, the leading edge surface 2021 and the trailing edge surface 2022 of the first blade 202 can be arc surfaces, and the corresponding front edge line 2021a and the trailing edge line 2022a on the front edge line 2021a and the trailing edge line 2022a on the plane passing through the second end surface 2024 are arc lines. At this time, the connecting line of the one end of the leading edge line 2021a towards the air inlet space 2011 and the one end of the trailing edge line 2022a towards the air inlet space 2011 is the connecting line of the vertex of the leading edge line 2021a and the vertex of the trailing edge line 2022a.

[0090] Please continue to refer to Figure 4 In the implementation of the present application, the projection of the first blade 202 on the reference plane has a first guide arc line corresponding to the first guide arc surface, the length of the first guide arc line is R1, the projection of the first blade 202 on the reference plane has a second guide arc line corresponding to the second guide arc surface, the length of the second guide arc line is R2. Since the first guide arc surface is adjacent to the first air inlet and the second guide arc surface is adjacent to the second air inlet, and the air volume of the first air inlet is greater than that of the second air inlet, in order to reduce the manufacturing cost, the second guide arc line R2 does not exceed the first guide arc line R1.

[0091] It can be understood that the second guide arc surface is located between the middle disc and the lower disc, so that when the middle disc is connected with the first blade 202, the first blade 202 has sufficient area to contact the middle disc, thereby ensuring the stability of the connection between the first blade 202 and the entire first frame 201.

[0092] Since the leading edge surface 2021 of the first blade 202 is the first contact surface of the airflow flowing in the working state of the first blade 202, and the trailing edge surface 2022 is the leaving surface of the airflow flowing in the working state of the first blade 202, the first flow guide structure 203 is arranged on the leading edge surface 2021 and the trailing edge surface 2022, which can effectively reduce or eliminate the vortex.

[0093] Specifically, please continue to refer to Figure 4 In the process of rotation of the plurality of first blades 202, the airflow enters the air inlet space 2011 and flows out of the air inlet space 2011 through the airflow channel between the adjacent two first blades 202, and the vortex is generated. By arranging the first flow guide structure 203 on the leading edge surface 2021 or the trailing edge surface 2022 of the first blade 202, or by arranging the first flow guide structure 203 on the leading edge surface 2021 and the trailing edge surface 2022 of the first blade 202 at the same time, the vortex during the operation of the first fan 20 can be significantly reduced, the pressure pulsation on the surface of the first blade 202 can be reduced, the airflow flowing between the first blades 202 can be improved, and thus the starting noise caused by the vortex can be reduced.

[0094] Specifically, the first flow guide structure 203 is a sawtooth structure, which includes wave crests and wave troughs connected in sequence and staggered. The wave crests and wave troughs are distributed along the axial direction of the first fan 20, that is, along the length of the first blade 202. In this way, the starting noise caused by the vortex can be effectively reduced by the wave crests and wave troughs connected in sequence and staggered.

[0095] In order to improve the air volume, in the embodiment of the present application, the first blade 202 is a backward bending (also known as backward tilting) blade. The backward bending blade adopts a streamline design, reduces fluid stall and leakage loss, and makes the air flow more smooth, so that the air volume of the fan 1000 system can be improved under the same input power.

[0096] The present application will further describe the smoke machine volute.

[0097] As Figures 6-7 shown, the smoke machine volute 100 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 and spacedly arranged, 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 is connected with and perpendicular to the first end plate 101 and the second end plate 102. The first end plate 101, the peripheral side plate 103, and the second end plate 102 jointly enclose a wind cavity 107 and an air outlet 106. The air outlet 106 is in communication with the wind cavity 107. An air inlet 105 in communication with the wind cavity 107 is formed in the first end plate 101 and / or the second end plate 102.

[0098] The first end plate 101 and the second end plate 102 are both provided with air inlets 105 communicating with the air cavity 107, that is, the air inlet mode of the smoke machine volute 100 is double-side air inlet, the air inlet 105 on the first end plate 101 is the first air inlet, the air inlet 105 on the second end plate 102 is the second air inlet, the second end plate 102 is provided with a limiting support 12 for mounting a motor, and the flue gas can be sucked into the air cavity 107 through the air inlets 105 on the smoke machine volute 100 under the action of the fan 1000 and then discharged from the air outlet 106.

[0099] As shown in Figures 9-10 , the outer contour of the normal projection of the circumferential side plate 103 on the first plane includes a first arc line 103a, an avoidance line 103b and a second arc line 103c arranged in sequence and connected along the circumferential direction of the circumferential side plate 103, and Figure 10 , the first arc line 103a and the second arc line 103c are dashed 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 plane of the first end plate 101 and the second end plate 102, and the curvature radius of each part of the avoidance line 103b is greater than the curvature radius of each part of the first arc line 103a and the second arc line 103c. It can be understood that the curvature radius of each part of the avoidance 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 avoidance line 103b is smaller than that of the first arc line 103a and the second arc line 103c, and the avoidance line 103b is smoother as a whole (closer to a straight line).

[0100] Specifically, the outer circumferential surface of the circumferential side plate 103 includes a first arc surface 1031, an avoidance surface 1032 and a second arc surface 1033 arranged in sequence and connected along the circumferential direction of the circumferential side plate 103, and the two ends of the avoidance surface 1032 are connected with the first arc surface 1031 and the second arc surface 1033 respectively, wherein the normal projection of the first arc surface 1031 on the first plane corresponds to the first arc line 103a, the normal projection of the avoidance surface 1032 on the first plane corresponds to the avoidance line 103b, and the normal projection of the second arc surface 1033 on the first plane corresponds to the second arc line 103c. The avoidance line 103b and the first arc line 103a and the second arc line 103c are all arc transition lines, that is, the avoidance surface 1032 and the first arc surface 1031 and the second arc surface 1033 are all arc surface transitions. Compared with two plane transitions at an angle, the arc surface transition can cause the two surfaces to have no sharp corners at the connection, 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).

[0101] It should be noted that the smoke machine volute 100 is installed in the installation space of the range hood 2000, so the volume of the smoke machine volute 100 is limited by the installation space of the range hood 2000. Since the radius of curvature of the avoidance line 103b is the largest compared to the first arc line 103a and the second arc line 103c, the avoidance line 103b is smoother than the first arc line 103a and the second arc line 103c. If the side of the smoke machine volute 100 has an area that exceeds the installation space, the outer contour of the orthographic projection of the side of the smoke machine volute 100 on the first plane can be set as the shape of the avoidance line 103b, thereby reducing the protrusion height of the side of the smoke machine volute 100, reducing the volume of the smoke machine volute 100, and improving the flow of flue gas at the avoidance surface 1032 of the smoke machine volute 100, reducing the backflow and vortex phenomenon of flue gas at the avoidance surface 1032 of the smoke machine volute 100, and reducing the noise generated by the smoke machine volute 100 when smoking.

[0102] Further, in some embodiments, the radius of curvature of the second arc line 103c is greater than the radius of curvature of the first arc line 103a at each point, so the bending degree of the second arc line 103c is smaller than that of the first arc line 103a, and the second arc line 103c is smoother than the first arc line 103a as a whole. At the same time, the radius of curvature of the avoidance line 103b is greater than the radius of curvature of the second arc line 103c at each point, that is, the radius of curvature of the avoidance line 103b is the largest compared to the first arc line 103a and the second arc line 103c, that is, the bending degree of the avoidance line 103b is smaller than that of the first arc line 103a and the second arc line 103c, and the avoidance line 103b is smoother (closer to a straight line) as a whole.

[0103] Optionally, as shown in Figure 10 the outflow opening 106 has an orthographic projection area on the first plane, the first end of the first arc line 103a extends to the orthographic projection area of the outflow opening 106, and the second end of the first arc line 103a is connected with the avoidance line 103b; the first end of the second arc line 103c is connected with the avoidance line 103b, and the second end of the second arc line 103c extends to the orthographic projection area of the outflow opening 106.

[0104] As can be easily understood, the first end of the first arc 103a and the second end of the second arc 103c form a projection area of the air outlet 106 on the first plane, that is, the air outlet 106 of the range hood volute 100 is formed by the first end plate 101, the second end plate 102, the first arc surface 1031 and the second arc surface 1033, and since the circumferential side plate 103 is connected to the first end plate 101 and the second end plate 102 perpendicularly, when the overall shape of the air outlet 106 is square, the side surface of the first end plate 101 close to the second end plate 102 is perpendicular to the first arc surface 1031 and the second arc surface 1033, and the side surface of the second end plate 102 close to the first end plate 101 is perpendicular to the first arc surface 1031 and the second arc surface 1033, so that the first end plate 101 and the second end plate 102 can be planar plate structures, thereby reducing the manufacturing difficulty of the range hood volute 100, and facilitating the batch production of the range hood volute 100.

[0105] Optionally, as shown in Figure 10 the outer contour of the projection of the circumferential side plate 103 on the first plane includes two oppositely arranged avoidance lines 103b, and the two avoidance lines 103b are respectively located on the two sides of the projection area of the air outlet 106.

[0106] It should be noted that the outer circumferential surface of the circumferential side plate 103 includes the first arc surface 1031, the first avoidance surface 1032, the second arc surface 1033 and the second avoidance surface 1032 arranged in sequence and connected along the circumferential direction of the circumferential side plate 103, the projection of the first arc surface 1031 on the first plane corresponds to the first arc 103a, the projection of the first avoidance surface 1032 on the first plane corresponds to the avoidance line 103b, the projection of the second arc surface 1033 on the first plane corresponds to the second arc 103c, and the shape of the projection of the second avoidance surface 1032 on the first plane is the same as that of the avoidance line 103b, and the first avoidance surface 1032 and the second avoidance surface 1032 are respectively located on the two sides of the air outlet 106, that is, the air outlet 106 of the range hood volute 100 is formed by the first end plate 101, the second end plate 102, the first arc surface 1031 and the second avoidance surface 1032, as shown in Figures 1-2 the avoidance surface 1032 of the range hood volute 100 is added, so that the range hood volute 100 is reduced in size while further improving the flow of flue gas at the avoidance surface 1032 of the range hood volute 100, reducing the backflow and vortex phenomenon of flue gas at the avoidance surface 1032 of the range hood volute 100, increasing the exhaust capacity of the air outlet 106, and reducing the noise generated by the range hood volute 100 when smoking.

[0107] Please refer to Figure 9In 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; 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.

[0108] Further, please refer to Figure 10 In some embodiments of the present application, the axial center line of the air inlet 105 is the O point in the orthographic projection of the first plane, 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 the O point, 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.

[0109] It is easy to understand that in the first plane, the orthographic projection of the first reference point C1 and the second reference point C2 is located inside the orthographic 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.

[0110] 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, 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.

[0111] It should be noted that Figure 6 is the complete curve of Cassini oval, and the curve equation of Cassini oval is:

[0112] (x 2 +y 2 ) 2 -2b(x 2 -y2 ) = b 4 -c 4 (wherein, b, c are constants).

[0113] 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), 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 x r2 = k 2 , so After the equation is simplified, the following equation is obtained:

[0114] (x 2 +y 2 ) 2 -0.5d(x 2 -y 2 ) = k 4 -(0.5d) 4 ;

[0115] 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, as shown in Figure 11 , 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 is reduced.

[0116] Please refer to Figure 8 , in some embodiments of the present application, a flow guide ring 24 is arranged at the air inlet 105 to guide the flow of flue gas, the flow guide ring 24 is arranged in an arc shape protruding away from the air cavity 107, which is beneficial for the external flue gas to enter the air cavity 107 from the air inlet 105 along the arc-shaped protruding surface of the flow guide ring 24.

[0117] In some embodiments, as shown in 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 with the wall of the air inlet 105, 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 flow of external flue gas. Wherein, the second flow guide structure 25 can be a sawtooth structure or an inclined surface structure, for example, the sawtooth structure is arranged on one side of the flow guide ring 24 facing the axis of the air inlet 105, the sawtooth structure can destroy the flow rule of vortex, thereby weakening or even eliminating the vortex phenomenon, achieving the effect of noise reduction and improving air volume.

[0118] Optionally, the flow guide ring 24 can be arc-shaped convexly arranged towards the direction away from the air cavity 107, and meanwhile, 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 inside of the air cavity 107 along the flow guide ring 24.

[0119] In 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, that is, the connection between the peripheral side plate 103 and the first end plate 101 and the second end plate 102 is all arranged 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 with the side of the peripheral side plate 103 in the width direction. Therefore, 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.

[0120] In some other embodiments of the present application, the housing 10 further comprises an arc-shaped transition portion, one end of the peripheral side plate 103 is connected with the first end plate 101 through the arc-shaped transition portion, and the other end of the peripheral side plate 103 is connected with the second end plate 102 through the arc-shaped transition portion. In this way, it is beneficial to further reduce the flue gas backflow and vortex phenomenon inside the range hood volute 100, and further increase the air volume of the air outlet 106 and reduce the noise.

[0121] The embodiments of the present application are exemplarily described with the range hood volute 100 in which the peripheral side plate 103 is connected and perpendicular to the first end plate 101 and the second end plate 102.

[0122] It should be further pointed out that, Figure 12 For the comparison curve diagram of the air volume of the air outlet 106 of the range hood in the related art and the air volume of the air outlet 106 of the range hood 2000 in the present application, in Figure 12 , the abscissa is time, the ordinate 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 2000 in 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 in the related art at different times, Figure 12 The curve diagram of the air volume of the air outlet 106 of the range hood 2000 in the present application compared with the air volume of the air outlet 106 of the range hood 2000 in the related art shows that the air volume of the range hood 2000 in the present embodiment is larger, which is more conducive to the exhaust of flue gas.

[0123]

[0124] Table 1

[0125] Table 1 is a comparison table of working noise of the range hood in the related art and the range hood of the present application, in which Figure 12 In the working state, the range hood 2000 equipped with the range hood of the present application has a working noise of 61.2 dB(A), which is 2.3 dB(A) lower than that of the range hood in the related art; in the case of half-muffled high wind, the range hood 2000 has a noise of 51.3 dB(A), which is 4.2 dB(A) lower than that of the range hood 2000 in the related art, thus indicating that the range hood 2000 in the embodiment produces less noise.

[0126] In the drawings of the embodiment, the same or similar reference numerals correspond to the same or similar parts; 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 the orientations or positional relationships based on 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 devices 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 patent, and for those skilled in the art, the specific meanings of the above terms can be understood according to the specific circumstances.

[0127] The above is only a preferred embodiment of the present application, and is not intended to limit the present application, and any modifications, equivalent replacements and improvements made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A wind wheel assembly, characterized by Comprising: a first wind wheel comprising a first frame body and a plurality of first blades, the plurality of first blades being spaced apart along a circumferential direction of the first frame body to form an air inlet space, each of the first blades having 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 flow guide camber surface, the flow guide camber surface being concave towards the trailing edge surface.

2. The wind wheel assembly of claim 1, wherein, Both ends of the leading edge surface are provided with the flow guide camber surface.

3. The wind wheel assembly of claim 2, wherein, The flow guide camber surface at one end of the leading edge surface is a first flow guide camber surface, and the flow guide camber surface at the other end of the leading edge surface is a second flow guide camber surface, the first flow guide camber surface extending from the leading edge surface to a first end surface of the first blade, and the second flow guide camber surface extending from the leading edge surface to a second end surface of the first blade.

4. The wind wheel assembly of claim 3, wherein, The leading edge surface and the trailing edge surface have corresponding leading edge lines and trailing edge lines in orthographic projection on a plane passing through the second end surface, a line connecting one end of the leading edge line facing the air inlet space and one end of the trailing edge line facing the air inlet space is parallel to a reference plane, and the reference plane is perpendicular to the second end surface; a distance between the two ends of the first flow guide camber surface in orthographic projection on the perpendicular plane in the extension direction of the line is W2, and the W2 satisfies 0.1W1≤W2≤0.5W1; and / or, a distance between the two ends of the second flow guide camber surface in orthographic projection on the perpendicular plane in the extension direction of the line is W3, and the W3 satisfies 0.1W1≤W3≤0.5W1; and / or, the first blade has a first flow guide camber line corresponding to the first flow guide camber surface in orthographic projection on the perpendicular plane, the first flow guide camber line has a length R1, the first blade has a second flow guide camber line corresponding to the second flow guide camber surface in orthographic projection on the perpendicular plane, and the second flow guide camber line has a length R2, wherein R2≤R1.

5. The wind wheel assembly according to claim 1, wherein the first blade is a back-curved blade.

6. The wind wheel assembly according to claim 1, wherein at least one of the trailing edge surface and the leading edge surface of the first blade is provided with a first flow guide structure, and the first flow guide structure extends in an axial direction of the first wind wheel.

7. A fan, characterized by Comprising: the wind wheel assembly according to any one of claims 1-6; and a range hood volute, the range hood volute comprising a housing having a wind cavity, an air inlet and an air outlet in communication with the wind cavity; wherein the wind wheel assembly is arranged in the wind cavity. The housing comprises:

8. The fan of claim 7, wherein, a first end plate; a second end plate arranged opposite to the first end plate; a circumferential side plate between the first end plate and the second end plate, and the first end plate and / or the second end plate is / are provided with an air inlet in communication with the wind cavity; wherein an outer contour of orthographic projection of the circumferential side plate on a first plane comprises a first camber line, a clearance line and a second camber line arranged in sequence and connected along a circumferential direction of the circumferential side plate, the first plane is perpendicular to an axial line of the air inlet, and a radius of curvature of each part of the clearance line is greater than a radius of curvature of each part of the first camber line and the second camber line. ​ 9. The fan of claim 8, wherein, The maximum length of the first end plate and the second end plate in the first direction is H, and the maximum length of the first end plate and the second end plate in the second direction is W, H < 600 mm, and 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.

10. The fan of claim 9, wherein, The axial center line of the air inlet is a projection of the first plane, 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 the O point, 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 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, the distance between the flow point and the second reference point is r2, (0.25d) 2 ≤ r1*r2 ≤ (0.36d) 2 .

11. The fan of claim 8, wherein, The air inlet is provided with a flow guide ring; The flow guide ring is arc-shaped and protrudes away from the air cavity, and / or the flow guide ring is provided with a second flow guide structure on one side of the axial center line of the air inlet.

12. The fan of claim 8, wherein The shell further comprises an arc-shaped transition portion, one end of the peripheral side plate is connected to the first end plate through the arc-shaped transition portion, and the other end of the peripheral side plate is connected to the second end plate through the arc-shaped transition portion. Or, the peripheral side plate is connected to the first end plate and the second end plate perpendicularly.

13. A range hood characterized by Comprising: A main body, an air suction port is formed in the main body, and a flue connected to the air suction port is arranged in the main body; And The fan of any one of claims 7-12 is arranged in the main body, and the fan sucks flue gas from the air suction port into the flue.

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