An air inlet ring, a fan, and an oil fume extraction device

Abstract

This invention belongs to the field of electrical technology, specifically disclosing an air inlet ring, a fan, and an oil fume extraction device. The air inlet ring includes multiple air guide sections connected end-to-end in the circumferential direction. Each air guide section is a curved surface structure convex towards the inner side of the air inlet ring. Each air guide section has inner and outer edges spaced apart radially and axially in the air inlet ring. Circumferentially, each air guide section bulges from both sides towards the center line of the air inlet ring. The fan includes a volute with an air inlet opening, an impeller installed within the volute, and the aforementioned air inlet ring. The air inlet ring is coaxially mounted on the edge of the air inlet opening, with its outer ring connected to the volute and its inner edge extending to the inner side of the impeller. This invention can reduce the noise during fan operation and improve the fan's air intake efficiency.

Description

Technical Field

[0001] This invention relates to the field of electrical technology, and in particular to an air inlet ring, a fan, and an oil fume extraction device. Background Technology

[0002] Range hoods are one of the most commonly used household appliances in modern homes. They use an internal fan to create negative pressure at the smoke inlet, which draws the cooking fumes from the kitchen into a public duct or the external environment, thus purifying the kitchen environment.

[0003] The fan in a conventional range hood typically includes a volute, an impeller housed inside the volute, and a drive motor installed in the volute and connected to the impeller. To improve air intake efficiency, an annular air intake ring is provided at the air intake opening of the volute. The outer ring of the air intake ring is connected to the air intake end of the volute, and the inner ring extends into the inside of the impeller. The cross-sectional shape of the air intake ring is usually arc-shaped to guide the airflow outside the volute along the air intake ring into the inside of the impeller.

[0004] The inlet ring provided by the existing technology is a rotating structure with the same cross-section everywhere. The distance between the inner ring of the inlet ring and the impeller is equal everywhere along the circumference of the impeller, both axially and radially. As a result, the airflow passing through the inlet ring will periodically impact the blades at the same position, resulting in large aerodynamic noise at the impeller and inlet ring. At the same time, secondary backflow will also occur at the mating position of the impeller and the inlet ring, thus reducing the overall efficiency of the fan. Summary of the Invention

[0005] The first technical problem solved by the present invention is to provide an air inlet ring that can improve the air intake and guide effect of the air inlet ring and reduce the noise of the fan using the air inlet ring during operation.

[0006] The second technical problem solved by the present invention is to provide a fan that can reduce the noise during operation and improve the aerodynamic performance of the fan.

[0007] The third technical problem solved by the present invention is to provide an oil fume extraction device that can reduce the noise during operation and improve the oil fume extraction performance.

[0008] The first technical problem mentioned above is solved by the following technical solution:

[0009] An air inlet ring includes a plurality of air guides connected end to end in the circumferential direction. Each air guide is a curved surface structure that protrudes toward the inside of the air inlet ring. Each air guide has an inner edge and an outer edge that are spaced apart in the radial and axial directions of the air inlet ring. In the circumferential direction of the air inlet ring, each air guide protrudes from both sides to the middle along the center line toward the center of the air inlet ring.

[0010] The air inlet ring described in this invention, compared with the prior art, has the following advantages: By setting multiple air guides connected end-to-end with a curved structure, and with each air guide bulging from both sides to the center towards the center of the air inlet ring, the radial distance between the inner edge of each air guide and the inner side of the impeller is different when the air inlet ring is set at the air inlet opening of the volute. This prevents the airflow passing through the air inlet ring from periodically impacting the blades at the same location, thereby avoiding significant aerodynamic noise at the impeller and air inlet ring. This design reduces airflow backflow between the impeller and the inlet ring, improving the efficiency of fans using this inlet ring. Simultaneously, because each guide section is a curved structure convex towards the inside of the inlet ring, the surfaces of multiple guide sections form undulating curved surfaces. This allows airflow entering from around the inlet ring and converging towards the inside of the inlet ring to undergo partial rectification via the curved surface of the inlet ring, thereby reducing airflow resistance, improving the smoothness of airflow entering the inside of the inlet ring, increasing the intake air volume, and ultimately improving the efficiency of fans using this inlet ring.

[0011] In one embodiment, the inner edge is an arc-shaped edge protruding away from the outer edge, and the arc-shaped edges of all the air guides are connected to make the inner edge of the air inlet ring wavy.

[0012] In one embodiment, the air guide has two side edges disposed opposite each other in the circumferential direction of the air inlet ring;

[0013] In the projection plane perpendicular to the center line of the air inlet ring, the central angle corresponding to the two side edges is Q, 10°≤Q≤36°; and / or, the air guide has a symmetrical plane located between the two side edges, and the air guide is symmetrically arranged relative to the symmetrical plane.

[0014] In one embodiment, the air guide has a highest protrusion located between the inner edge and the outer edge, the highest protrusion protruding beyond the plane of the outer edge.

[0015] In one embodiment, the air guide has two side edges disposed opposite to each other in the circumferential direction of the air inlet ring and a symmetrical plane located between the two side edges, the air guide being symmetrically disposed relative to the symmetrical plane;

[0016] At the side edge, the distance between the highest protrusion of the air guide and the outer end point along the axial direction of the air inlet ring is h1, where 0≤h1≤5mm;

[0017] At the plane of symmetry, the distance between the highest protrusion of the air guide and the outer end point on the axial direction of the air inlet ring is h2, where h2 > h1.

[0018] In one embodiment, the air guide portion extends along the axial direction of the air inlet ring at the inner edge;

[0019] And / or, the air inlet ring further includes a mounting ring portion, the outer edges of all the air guide portions are connected to the mounting ring portion, and the mounting ring portion extends radially outward along the air inlet ring;

[0020] And / or, the outer edge is an arc-shaped structure that protrudes in a direction away from the center line.

[0021] The second technical problem mentioned above is solved by the following technical solution:

[0022] A fan includes a volute having an air inlet and an impeller installed inside the volute. The fan also includes an air inlet ring as described above, the air inlet ring being coaxially mounted on the edge of the air inlet, and the outer ring of the air inlet ring being connected to the volute, the inner edge of which extends to the inner side of the impeller.

[0023] Compared with the prior art, the fan described in this invention has the following advantages: by adopting the above-mentioned air inlet ring, the noise of the fan during operation can be reduced, the operating efficiency of the fan can be improved, and the user experience of the fan can be enhanced.

[0024] In one embodiment, the distance between the two ends of the inner edge and the inner side of the impeller in the radial direction of the impeller is t1, and the distance between the center of the inner edge in the circumferential direction of the impeller and the inner side of the impeller in the radial direction of the impeller is t2, where t1 < t2 ≤ t1 + 5 mm;

[0025] And / or, the distance between the two ends of the inner edge and the windward end face of the impeller in the axial direction of the impeller is H1, and the distance between the center of the inner edge in the circumferential direction of the impeller and the windward end face in the axial direction is H2, where H1 < H2 ≤ H1 + 10 mm.

[0026] In one embodiment, 2mm ≤ t1 ≤ 6mm, and / or, 0mm ≤ H1 ≤ 10mm.

[0027] The third technical problem mentioned above is solved by the following technical solution:

[0028] An oil fume extraction device, comprising the fan described above.

[0029] Compared with the prior art, the fume extraction equipment of the present invention has the following advantages: by using the above-mentioned fan, the noise of the fume extraction equipment during operation can be reduced, the fume extraction performance of the fume extraction equipment can be improved, and the user experience of the fume extraction equipment can be enhanced. Attached Figure Description

[0030] Figure 1This is a schematic diagram of the structure of a fan provided in an embodiment of the present invention;

[0031] Figure 2 A top view of a fan provided in an embodiment of the present invention;

[0032] Figure 3 for Figure 2 Sectional view at point AA;

[0033] Figure 4 for Figure 3 A magnified view of a section at point I;

[0034] Figure 5 for Figure 2 Sectional view at point BB;

[0035] Figure 6 for Figure 5 A magnified view of a section at point J;

[0036] Figure 7 This is a cross-sectional view of a fan provided in an embodiment of the present invention;

[0037] Figure 8 for Figure 7 A magnified view of a section at point K;

[0038] Figure 9 This is a schematic diagram of the air inlet ring provided in an embodiment of the present invention;

[0039] Figure 10 A cross-sectional view of the air inlet ring provided in an embodiment of the present invention;

[0040] Figure 11 for Figure 10 A magnified view of the area at point L.

[0041] Figure 12 This is a schematic diagram showing the results of fluid simulation of a traditional air inlet ring;

[0042] Figure 13 This is a schematic diagram showing the results of fluid simulation of the air inlet ring provided by the present invention;

[0043] Figure 14 This is a cross-sectional view of the fume extraction device provided in an embodiment of the present invention.

[0044] Label Explanation:

[0045] 100. Fan; 200. Air box; 300. Smoke hood;

[0046] 1. Air inlet ring; 11. Air guide section; 111. Air guide arc section; 112. Air guide end; 113. Inner edge; 114. Outer edge; 115. Side edge; 12. Mounting ring;

[0047] 2. Volute; 21. Air inlet opening; 22. Air inlet end plate; 23. Air outlet;

[0048] 3. Impeller; 31. End plate ring; 311. Windward end face; 32. Blades;

[0049] 4. Drive motor;

[0050] CP, plane of symmetry. Detailed Implementation

[0051] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0052] In the description of this invention, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0053] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0054] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0055] like Figures 1-4 As shown, this embodiment provides a fan 100 to improve the air intake smoothness of the fan 100, reduce the noise of the fan 100 during operation, and enhance the user experience of the fan 100.

[0056] In this embodiment, the fan 100 includes a volute 2, an air inlet ring 1, an impeller 3, and a drive motor 4. The volute 2 has an air inlet opening 21, an air cavity, and an air outlet 23 connected sequentially. The impeller 3 is installed inside the air cavity, with its windward end face 311 facing the air inlet opening 21. The air inlet ring 1 is coaxially arranged around the edge of the air inlet opening 21, and its inner cavity forms an air inlet to guide external airflow into the impeller 3. The drive motor 4 is installed in the volute 2 and connected to the impeller 3, so that the drive motor 4 drives the impeller 3 to rotate.

[0057] The air inlet ring 1 is arranged in a ring shape and has multiple air guide sections 11 connected end to end along the circumference. Each air guide section 11 is a curved surface structure that bulges towards the inside of the air inlet ring 1. Each air guide section 11 has an inner edge 113 and an outer edge 114 that are spaced apart in the radial and axial directions of the air inlet ring 1. In the circumferential direction of the air inlet ring 1, each air guide section 11 bulges from both sides to the center along the center line of the air inlet ring 1. The outer edge 114 of the air guide section 11 is located at the edge of the air inlet opening 21, and the inner edge 113 of the air guide section 11 extends into the interior of the impeller 3.

[0058] The air inlet ring 1 provided in this embodiment has multiple curved air guide sections 11 connected end to end. Each air guide section 11 bulges from both sides towards the center of the air inlet ring 1, ensuring that the radial distance between the inner edge 113 of each air guide section 11 and the inner side of the impeller 3 is different when the air inlet ring 1 is positioned at the air inlet opening 21 of the volute 2. This prevents the airflow passing through the air inlet ring 1 from periodically impacting the blades 32 at the same location, thereby avoiding significant aerodynamic noise between the impeller 3 and the air inlet ring 1, and reducing airflow noise at the impeller. The backflow between the air inlet ring 1 and the air inlet ring 3 improves the efficiency of the fan 100 using the air inlet ring 1. At the same time, since each air guide 11 is a curved structure that protrudes towards the inside of the air inlet ring 1, the surface of the multiple air guides 11 forms a wave-like curved surface. This allows the airflow entering from around the air inlet ring 1 and converging towards the inside of the air inlet ring 1 to be partially rectified by the curved surface of the air inlet ring 1, thereby reducing the airflow resistance, improving the smoothness of the airflow entering the interior of the air inlet ring 1, and thus increasing the intake air volume and improving the efficiency of the fan 100 using the air inlet ring 1.

[0059] The fan 100 provided in this embodiment, by adopting the aforementioned air inlet ring 1, can reduce the noise of the fan 100 during operation, improve the efficiency of the fan 100, and enhance the user experience of the fan 100.

[0060] In one embodiment, one end of the volute 2 has an air inlet 21, meaning the fan 100 uses a single-sided air inlet configuration. The air inlet 21 is located on the air inlet end plate 22 of the volute 2, and the drive motor 4 is mounted on the side of the volute 2 opposite to the air inlet end plate 22. In other embodiments, the volute 2 may also have two air inlets 21, one of which is a main air inlet and the other is an auxiliary air inlet. It is possible that only the main air inlet has the aforementioned air inlet ring 1, or that both air inlets 21 have the aforementioned air inlet ring 1.

[0061] The impeller 3 includes end plate rings 31 arranged opposite each other in the circumferential direction and blades 32 connected between the two end plate rings 31. Multiple blades 32 are arranged at intervals along the circumferential direction of the end plate rings 31, wherein one end face of the end plate ring 31 near the air inlet 21 forms the windward end face 311.

[0062] It is worth noting that the structure of the volute 2, impeller 3 and drive motor 4 and their mutual cooperation structure can be set with reference to the existing technology. This is not the focus of this invention, and this invention does not limit or elaborate on it.

[0063] like Figures 2 to 6 As shown, in one embodiment, the inner edge 113 of each air guide 11 is an arc-shaped edge that protrudes away from the outer edge 114. The arc-shaped edges of all air guides 11 are connected end to end, so that the inner edge of the air inlet ring 1 is a wavy edge. The arc-shaped edge setting makes the distance between the inner edge 113 and the windward end face 311 of the impeller 3 in the axial direction of the fan 100 gradually increase from both sides to the middle. This allows the airflow entering the impeller 3 along the air guide 11 to enter the impeller 3 sequentially in the axial direction of the impeller 3, avoiding the formation of periodic shear airflow between the high-speed rotating impeller 3 and the air inlet ring 1 at the same axial position. This reduces the turbulent boundary layer separation airflow, further reduces the noise of the fan 100 during operation, and improves the efficiency of the fan 100.

[0064] The air guide section 11 has two side edges 115 arranged opposite each other around the air inlet ring 1. In the projection plane perpendicular to the center line of the air inlet ring 1, the central angle between the two side edges 115 is Q, where 10° ≤ Q ≤ 36°. If the angle Q is too large, the surface area of ​​a single air guide section 11 will be too large, resulting in the air inlet ring 1 being approximately polygonal, thus reducing the airflow guiding effect. If the angle Q is too small, with the curvature of the air guide section 11 remaining constant, the radial distance between the inner edge 113 of the air guide section 11 and the inner side of the impeller 3 will be too small, resulting in a poorer noise reduction effect. Conversely, if the radial distance difference between the inner edge 113 and the inner side of the impeller 3 is maintained, the curvature of the air guide section 11 will be large, further degrading its airflow guiding effect. Therefore, setting Q to between 10° and 36° can better ensure the airflow guiding and noise reduction effects of the air guide section 11.

[0065] The air guide section 11 has a symmetrical plane CP located between two side edges 115. The air guide section 11 is symmetrically arranged with respect to the symmetrical plane CP, that is, the height of the air guide section 11 at the symmetrical plane CP relative to the two side edges 115 is the greatest, which can improve the smoothness of airflow through the air guide section 11. At the same time, this arrangement also helps to improve the processing and design convenience of the air inlet ring 1 and reduce processing costs.

[0066] The air guide section 11 forms an air guide surface on the side facing the fan axis. Axially, the air guide section 11 has a highest protrusion located between the inner edge 113 and the outer edge 114, protruding beyond the plane of the outer edge 114. That is, the air guide surface is partially higher than the opening end face of the air inlet 21, facilitating the guidance of airflow into the air inlet ring 1. This increases the contact area between the airflow and the air inlet ring 1, thereby improving the smoke condensation effect, increasing grease separation, and ultimately enhancing the performance of the range hood using this air inlet ring 1.

[0067] At the side edge 115, the distance between the highest protrusion of the air guide 11 and its outer end point along the axial direction of the air inlet ring 1 is h1, where 0 ≤ h1 ≤ 5 mm; at the symmetry plane CP, the distance between the highest protrusion of the air guide 11 and its outer end point along the axial direction of the air inlet ring is h2, where h2 > h1. By setting h1 to be greater than or equal to zero, the air guide 11 can protrude axially relative to the outer edge 114. However, the protrusion of the air guide 11 increases the axial dimension of the fan 100. If the protrusion height of the air guide 11 is too large, it will reduce the axial clearance between the fan 100 and the air box, thereby reducing the effective air intake area of ​​the fan 100. Therefore, setting h1 between 0 and 5 mm is beneficial for improving the air intake area and air intake efficiency; h2 ≤ h1 + 5 mm is set to avoid the air guide 11 protruding too much from both sides to the middle in the circumferential direction, which would affect the air intake. Specifically, h1 can be, but is not limited to, 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm or 5mm.

[0068] In one embodiment, the distance between the two ends of the inner edge 113 and the windward end face 311 of the impeller 3 is H1, where 0mm ≤ H1 ≤ 10mm. This arrangement ensures that there is no axial gap between the inlet ring 1 and the impeller 3, thereby reducing leakage of secondary airflow at this gap during the operation of the fan 100 and avoiding the problem of reduced aerodynamic efficiency due to airflow leakage. Simultaneously, it also avoids the problem of a large axial overlap between the inlet ring 1 and the impeller 3, which would reduce the contact area between the impeller 3 and the airflow, thus preventing a decrease in the operating efficiency of the blades 32. That is, setting H1 between 0 and 10mm can better guarantee the aerodynamic efficiency of the fan 100. Specifically, H1 can be, but is not limited to, 1mm, 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, or 10mm.

[0069] The axial distance between the center of the inner edge 113 and the windward end face 311 is H2, where H1 < H2 ≤ H1 + 10 mm. This causes the axial distance between the inner edge 113 and the windward end face 311 to gradually increase from both ends to the center. This results in the airflow introduced by the air inlet ring 1 having different axial contact positions with the impeller 3. It also avoids a large difference between H2 and H1, which would lead to excessive obstruction of the blades 32 and thus affect the aerodynamic performance of the fan 100.

[0070] like Figure 7 and Figure 8 As shown, in one embodiment, the radial dimension of the end of the inner edge 113 and the center line in the air inlet ring 1 is d1, and the radial dimension of the center of the inner edge 113 in the circumferential direction of the air inlet ring 1 and the center line in the air inlet ring 1 is d2, where d1-5mm≤d2<d1. This results in the radial distance between the inner edge 113 and the impeller 3 gradually increasing from both sides of the circumference towards the plane of symmetry CP, while avoiding an excessively large difference between d1 and d2 that would lead to a small curvature of the air guide section 11, thus affecting the air guiding effect.

[0071] That is, the distance between the two ends of the inner edge 113 and the inner side of the impeller 3 in the radial direction of the impeller 3 is t1, and the distance between the center of the inner edge 113 in the circumferential direction of the impeller 3 and the inner side of the impeller 3 in the radial direction of the impeller 3 is t2, where t1 < t2 ≤ t1 + 5 mm.

[0072] In one embodiment, 2mm ≤ t1 ≤ 6mm. If the value of t1 is small, manufacturing errors may cause the inner edge 113 to scrape against the impeller 3, leading to abnormal noise or jamming of the impeller 3 during rotation. If the value of t1 is too large, the secondary backflow airflow generated by the impeller 3 during operation may leak at the gap between the impeller 3 and the air inlet ring 1. That is, the setting of the parameters t1 and t2 helps to reduce backflow at the gap while ensuring the effective air intake area, thereby improving the efficiency of the fan 100.

[0073] like Figures 9-11 As shown, the outer convex surface of the air guide 11 forms a guide surface. In one embodiment, the air guide 11 extends along the axial direction of the air inlet ring 1 at its inner edge 113. This allows the airflow entering the impeller 3 along the guide surface to enter the impeller 3 along the axial direction of the impeller 3, reducing the probability of the airflow colliding with the blades 32 of the impeller 3, thereby reducing the noise during airflow and improving the efficiency of the fan 100.

[0074] Furthermore, the air guide portion 11 includes an air guide arc portion 111 and a guide end portion 112. The air guide arc portion 111 is an arc surface convex towards the center line, and the guide end portion 112 is smoothly connected to the inner end of the air guide arc portion 111 and is parallel to the center line. The axial length of the guide end portion 112 is 1mm to 5mm to improve the directional rectification effect on the introduced airflow. Specifically, the axial length of the guide end portion 112 can be, but is not limited to, 1mm, 2mm, 3mm, 4mm, or 5mm.

[0075] Furthermore, on the projection plane perpendicular to the center line, the guide end 112 is an arc-shaped structure with its opening facing away from the center line. In the projection plane perpendicular to the symmetry plane CP and parallel to the center line, the guide end 112 is an arc-shaped structure with its opening facing upwards.

[0076] In one embodiment, the outer edge 114 is an arc-shaped structure that protrudes in a direction away from the center line, so that the shape of the outer edge 114 can better match the overall shape of the air guide 11, thereby improving the air guiding effect. At the same time, this arrangement allows all outer edges 114 to be located in the same plane, reducing the processing difficulty of the air inlet ring 1.

[0077] In one embodiment, the air inlet ring 1 further includes a mounting ring 12, and the outer edges 114 of all the air guides 11 are connected to the mounting ring 12. The mounting ring 12 extends outward along the radial direction of the air inlet ring 1. By providing the mounting ring 12, the connection convenience of the air inlet ring 1 on the volute 2 can be improved.

[0078] In one embodiment, the air inlet ring 1 is welded to or detachably connected to the volute 2, allowing the air inlet ring 1 and the volute 2 to be separately configured, reducing processing difficulty and improving the ease of replacement of the air inlet ring 1. In other embodiments, the air inlet ring 1 can also be integrally configured with the volute 2. Specifically, the mounting ring 12 is attached to the air inlet end face of the volute 2, and the projection of the inner edge 113 on the windward end face 311 is located inside the air inlet opening 21 to improve the airflow guiding effect.

[0079] like Figure 12 and Figure 13As shown in the simulation cloud diagram, the traditional air inlet ring has a large and concentrated high static pressure area, while the area of ​​the high static pressure area on the air inlet ring 1 provided by the present invention is significantly smaller than that of the traditional air inlet ring. This indicates that the airflow is more evenly distributed within the air inlet ring 1, thereby reducing flow separation, lowering the turbulent kinetic energy intensity inside the fan 100, and thus reducing energy loss and improving the overall flow efficiency. At the same time, the reduction of the high static pressure area can reduce the pressure gradient inside the fan 100, reduce energy loss, and improve the total pressure efficiency of the fan 100.

[0080] like Figure 14 As shown, this embodiment also provides an oil fume extraction device, including the aforementioned fan 100. The oil fume extraction device provided in this embodiment, by employing the aforementioned fan 100, can reduce the noise during operation of the oil fume extraction device and improve the user experience.

[0081] In one embodiment, the fume extraction device includes a fume hood 300 and a fan box 200 installed on the upper end of the fume hood 300. The fume hood 300 has a smoke inlet and a smoke collection chamber communicating with the smoke inlet. A fan 100 is installed inside the fan box 200, and the air inlet 21 communicates with the smoke collection chamber through the inner cavity of the fan box 200.

[0082] In other embodiments, the fume extraction device can also be an integrated stove or other structure capable of fume extraction. This embodiment does not limit the specific model of the fume extraction device. At the same time, the installation structure of the fan 100 in the fume extraction device can be set using existing technology. This is not the focus of this invention, and this invention does not limit or elaborate on it.

[0083] In the specific implementation of the above embodiments, the technical features can be combined in any non-contradictory way. For the sake of brevity, not all possible combinations of the above technical features are described. However, as long as the combination of these technical features is not contradictory, it should be considered to be within the scope of this specification.

[0084] The specific embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of this patent should be determined by the appended claims.

Claims

1. An air inlet ring, characterized in that: The air inlet ring includes a plurality of air guides (11) connected end to end in the circumferential direction. Each air guide (11) is a curved surface structure that protrudes towards the inside of the air inlet ring. Each air guide (11) has an inner edge (113) and an outer edge (114) that are spaced apart in the radial and axial directions of the air inlet ring. In the circumferential direction of the air inlet ring, each air guide (11) protrudes from both sides to the middle along the center line towards the air inlet ring. The air guide (11) has two side edges (115) arranged opposite each other in the circumference of the air inlet ring. In the projection plane perpendicular to the center line of the air inlet ring, the central angle corresponding to the two side edges (115) is Q, 10°≤Q≤36°. The air guide (11) has a highest protrusion position located between the inner edge (113) and the outer edge (114), and the highest protrusion position protrudes from the plane of the outer edge (114) in the axial direction of the air inlet ring.

2. The air inlet ring according to claim 1, characterized in that, The inner edge (113) is an arc-shaped edge that protrudes away from the outer edge (114), and the arc-shaped edges of all the air guides (11) are connected to make the inner edge of the air inlet ring wavy.

3. The air inlet ring according to claim 1, characterized in that, The air guide (11) has a symmetry plane (CP) located between the two side edges (115), and the air guide (11) is symmetrically arranged with respect to the symmetry plane (CP).

4. The air inlet ring according to claim 1, characterized in that, The air guide (11) has two side edges (115) arranged opposite each other in the circumferential direction of the air inlet ring and a symmetry plane (CP) located between the two side edges (115), and the air guide (11) is symmetrically arranged with respect to the symmetry plane (CP); At the plane passing through the side edge (115) and the axis of the air inlet ring, the distance between the highest protrusion of the air guide (11) and the outer end of the air guide (11) in the axial direction of the air inlet ring is h1, 0≤h1≤5mm; At the plane of symmetry (CP), the distance between the highest protrusion of the air guide (11) and the outer end of the air guide (11) along the axial direction of the air inlet ring is h2, where h2 > h1.

5. The air inlet ring according to any one of claims 1-4, characterized in that, The air guide (11) extends along the axial direction of the air inlet ring at the inner edge (113); And / or, the air inlet ring further includes a mounting ring (12), the outer edges (114) of all the air guides (11) are connected to the mounting ring (12), the mounting ring (12) extending radially outward along the air inlet ring; And / or, the outer edge (114) is an arc-shaped structure that protrudes in a direction away from the center line.

6. A fan comprising a volute (2) having an air inlet (21) and an impeller (3) mounted within said volute (2), characterized in that, The fan further includes an air inlet ring as described in any one of claims 1-5, the air inlet ring being coaxially mounted on the edge of the air inlet opening (21), and the outer ring of the air inlet ring being connected to the volute (2), the inner edge (113) extending to the inner side of the impeller (3) and spaced apart from the impeller (3).

7. The fan according to claim 6, characterized in that, The distance between the two ends of the inner edge (113) and the inner side of the impeller (3) in the radial direction is t1, and the distance between the center of the inner edge (113) in the circumferential direction of the impeller (3) and the inner side of the impeller (3) in the radial direction is t2, where t1 < t2 ≤ t1 + 5 mm; And / or, the distance between the two ends of the inner edge (113) and the windward end face (311) of the impeller (3) in the axial direction of the impeller (3) is H1, and the distance between the center of the inner edge (113) in the circumferential direction of the impeller (3) and the windward end face (311) in the axial direction is H2, where H1 < H2 ≤ H1 + 10 mm.

8. The fan according to claim 7, characterized in that, 2mm≤t1≤6mm, and / or, 0mm≤H1≤10mm.

9. A fume extraction device, characterized in that, Including the wind turbine as described in any one of claims 6-8.

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