Volute, fan and extractor hood

Abstract

This application relates to the field of fan technology, disclosing a volute, a fan, and a range hood. The volute includes: a first housing including a first annular wall; and a second housing including a second annular wall. The first and second housings are detachably connected by the first and second annular walls to jointly enclose an installation cavity. The axial lengths of the first and second annular walls are different. In situations with limited operating space, the annular wall with the shorter axial length faces the access port, and the connection point of the two annular walls is also close to the access port, facilitating quick disassembly of a portion of the volute housing for easier internal maintenance and improving maintenance convenience.

Description

Technical Field

[0001] This application relates to the field of fan technology, such as a volute, a fan, and a range hood. Background Technology

[0002] Currently, a range hood is a kitchen appliance used to purify the kitchen environment. Installed in conjunction with a kitchen stove, it quickly removes waste from combustion and harmful fumes produced during cooking, expelling them outdoors. Simultaneously, it condenses and collects the fumes, reducing pollution, purifying the air, and providing safety features such as protection against toxic substances and explosions. A fan inside the range hood drives the airflow within the ductwork, enabling it to extract and exhaust smoke.

[0003] In related technologies, a wind turbine includes a volute and an impeller, with the impeller located inside the volute. The volute is typically designed as a detachable symmetrical structure.

[0004] In the process of implementing the embodiments of this disclosure, at least the following problems were found in the related art:

[0005] In related technologies, symmetrical shell structures, where the axial lengths of the two annular walls of the volute are the same, typically require the two shells to be completely separated and removed when internal maintenance is needed. This not only involves numerous and time-consuming steps but is also particularly difficult in space-constrained installation environments.

[0006] It should be noted that the information disclosed in the background section above is only used to enhance the understanding of the background of this application, and therefore may include information that does not constitute prior art known to those skilled in the art. Utility Model Content

[0007] To provide a basic understanding of some aspects of the disclosed embodiments, a brief summary is given below. This summary is not intended as a general commentary, nor is it intended to identify key / important components or describe the scope of protection of these embodiments, but rather as a prelude to the detailed description that follows.

[0008] This disclosure provides a volute, a fan, and a range hood to improve the uniformity of airflow distribution within the volute and increase the efficiency of the fan.

[0009] This disclosure provides a volute housing, comprising: a first housing including a first annular wall; and a second housing including a second annular wall. The first housing and the second housing are detachably connected by the first annular wall and the second annular wall to jointly enclose an installation cavity. The axial length of the first annular wall is different from that of the second annular wall.

[0010] This disclosure also provides a fan, which includes a volute as described in any of the above embodiments.

[0011] This disclosure also provides a range hood, which includes a fan as described in any of the above embodiments.

[0012] The volute, fan, and range hood provided in this disclosure can achieve the following technical effects:

[0013] In this embodiment, the volute's annular walls include a first annular wall and a second annular wall with different axial lengths. This allows for easy disassembly of the casing corresponding to the shorter axial wall when maintenance is required, while the casing corresponding to the longer axial wall remains stationary or is slightly moved, exposing the internal space of the volute. This facilitates quick and convenient disassembly when minor fan problems do not require impeller removal. Especially in situations with limited operating space, the shorter axial wall faces the inspection port, and the connection point between the two annular walls is also close to the inspection port, enabling rapid disassembly of parts of the volute casing for easier internal maintenance and improving maintenance convenience.

[0014] In addition, the asymmetric volute can adapt to the non-uniform centrifugal force field of the asymmetric impeller, which can change the flow path of the airflow in the volute and make the airflow distribution more uniform at different axial positions, thereby improving the ventilation efficiency of the fan, reducing local resistance, enhancing the performance of the fan, and reducing noise. The volute can be used for different working conditions, installation environments and application scenarios.

[0015] The above general description and the description below are exemplary and illustrative only and are not intended to limit this application. Attached Figure Description

[0016] One or more embodiments are illustrated by way of example with reference to the accompanying drawings. These illustrations and drawings do not constitute a limitation on the embodiments. Elements having the same reference numerals in the drawings are shown as similar elements. The drawings are not to be scaled. And wherein:

[0017] Figure 1 This is a partial structural schematic diagram of a range hood provided in an embodiment of this disclosure;

[0018] Figure 2 This is a schematic diagram of the cooperation structure of a fan and motor bracket from one perspective, provided in an embodiment of this disclosure;

[0019] Figure 3 This is a schematic diagram of the assembly structure of a motor bracket and a motor provided in an embodiment of this disclosure;

[0020] Figure 4 This is a schematic diagram of the structure of a motor bracket provided in an embodiment of this disclosure;

[0021] Figure 5This is a schematic diagram of the cooperative structure of a motor bracket, a fan, and a reinforcing plate provided in an embodiment of this disclosure;

[0022] Figure 6 This is a schematic diagram of the structure of a fan and motor bracket from another perspective, provided in an embodiment of this disclosure.

[0023] Figure 7 This is a schematic diagram of the structure of a wind turbine from one perspective, provided in an embodiment of this disclosure;

[0024] Figure 8 yes Figure 7 Schematic diagram of the cross-sectional structure along the AA direction;

[0025] Figure 9 This is a schematic diagram of the structure of an impeller provided in an embodiment of this disclosure;

[0026] Figure 10 This is a schematic diagram of the structure of a volute provided in an embodiment of this disclosure from one perspective;

[0027] Figure 11 This is a schematic diagram of the structure of a first housing provided in an embodiment of this disclosure;

[0028] Figure 12 This is a schematic diagram of the structure of a second housing provided in an embodiment of this disclosure;

[0029] Figure 13 This is a schematic diagram of the cooperative structure of a fan and a noise reduction plate provided in an embodiment of this disclosure;

[0030] Figure 14 yes Figure 13 A schematic diagram of the cross-sectional structure along the BB direction;

[0031] Figure 15 This is a schematic diagram of the structure of a noise reduction board provided in an embodiment of this disclosure;

[0032] Figure 16 This is a schematic diagram of another cooperative structure of a fan and a noise reduction plate provided in an embodiment of this disclosure;

[0033] Figure 17 This is a schematic diagram of another noise reduction board provided in an embodiment of this disclosure;

[0034] Figure 18 This is a schematic diagram of the structure of a fan provided in an embodiment of this disclosure from another perspective;

[0035] Figure 19 This is a schematic diagram of another volute structure provided in an embodiment of this disclosure;

[0036] Figure 20 This is a schematic diagram of another volute structure provided in an embodiment of this disclosure;

[0037] Figure 21 This is a schematic diagram of another fan provided in an embodiment of this disclosure.

[0038] Figure label:

[0039] 10. Outer casing; 11. Air duct; 12. Smoke exhaust port; 14. Reinforcing plate; 141. First reinforcing plate; 142. Second reinforcing plate; 20. Fan; 21. Volute; 211. Mounting cavity; 22. Cover plate; 221. First cover plate; 2211. Air inlet; 222. Second cover plate; 2221. Motor mounting port; 23. Annular wall; 231. First annular wall; 232. Second annular wall; 233. First connecting edge; 234. Second connecting edge; 235. Protrusion; 236. Groove; 237. First connecting hole; 238. Second connecting hole; 24. Chamfer; 25. Check valve; 26. Impeller; 261. Serrated structure; 262. Chamfer; 27. Oil drain port; 271. Insertion protrusion; 272. Second through hole; 28. Motor; 30. Motor bracket; 31. Mounting ring; 32. Connecting plate; 33. Support plate; 331. First support plate; 332. Second support plate; 34. First connecting flange; 341. First flange; 3411. First connecting through hole; 342. Second flange; 3421. Second connecting through hole; 35. Second connecting flange; 40. Noise reduction plate; 41. Noise reduction hole; 42. Silencing cavity; 43. Oil guide groove; 44. Oil drain port; 45. Insertion groove; 451. First through hole; 46. First end; 47. Second end. Detailed Implementation

[0040] To provide a more detailed understanding of the features and technical content of the embodiments of this disclosure, the implementation of the embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. The accompanying drawings are for illustrative purposes only and are not intended to limit the embodiments of this disclosure. In the following technical description, for ease of explanation, several details are used to provide a full understanding of the disclosed embodiments. However, one or more embodiments may still be implemented without these details. In other cases, well-known structures and devices may be simplified in their depiction to simplify the drawings.

[0041] The terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this disclosure are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for describing embodiments of this disclosure herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion.

[0042] In this disclosure, the terms "upper," "lower," "inner," "middle," "outer," "front," and "rear," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for better description of the embodiments of this disclosure and their implementations, and are not intended to limit the indicated devices, elements, or components to having a specific orientation, or to require them to be constructed and operated in a specific orientation. Furthermore, some of the aforementioned terms may be used to indicate other meanings besides orientation or positional relationship; for example, the term "upper" may in some cases indicate a dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in the embodiments of this disclosure according to the specific circumstances.

[0043] Furthermore, the terms "set up," "connect," and "fix" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this disclosure according to the specific circumstances.

[0044] Unless otherwise stated, the term "multiple" means two or more.

[0045] The term "and / or" describes an association between objects, indicating that three relationships can exist. For example, A and / or B means: A or B, or A and B.

[0046] It should be noted that, unless otherwise specified, the embodiments and features described in the present disclosure can be combined with each other.

[0047] For ease of description, the up / down, left / right, and front / back directions in this application are as follows: Figure 1 As shown in the diagram. The axial direction of the fan refers to the forward and backward direction.

[0048] Combination Figures 1 to 21 As shown, this embodiment of the present disclosure provides a range hood, which includes a fan 20 and a housing 10. The housing 10 defines a duct 11 having a smoke inlet and a smoke outlet 12. The fan 20 is located inside the duct 11, and the fan 20 can exhaust the fumes drawn in by the smoke inlet through the duct 11 and the smoke outlet 12.

[0049] This disclosure provides a fan 20, which includes a volute 21 and an impeller 26. The volute 21 includes a cover plate 22 and an annular wall 23 connected to each other. The cover plate 22 and the annular wall 23 enclose a mounting cavity 211, and the impeller 26 is located inside the mounting cavity 211, that is, inside the volute 21.

[0050] Alternatively, the fan can be a centrifugal fan.

[0051] In some embodiments, the volute 21 is made of a non-metallic material.

[0052] In this embodiment, the volute 21 is made of non-metallic material, which reduces its weight and the requirements for the supporting structure, thus lowering transportation and installation costs. Non-metallic materials also have good corrosion resistance, effectively resisting corrosion from substances such as oil, and extending service life. Furthermore, they possess good electrical insulation properties, effectively preventing live components such as the fan motor from contacting external conductive materials, reducing the risk of leakage. Non-metallic materials can also be rapidly manufactured into volutes with complex shapes and high precision requirements through various molding processes such as injection molding and compression molding. This allows for more flexible and diverse volute structures, enabling optimized internal flow channel shapes and structures based on the aerodynamic performance requirements and installation space constraints of the fan 20, improving the fan's freedom of movement and performance, while also helping to reduce manufacturing costs and production cycles. Compared to metallic materials, non-metallic materials are generally less expensive and do not require complex metal processing equipment and processes such as casting, forging, and machining, reducing energy consumption and mold costs, further lowering the fan's cost.

[0053] Non-metallic materials exhibit relatively stable performance under varying temperature and humidity conditions, unlike metallic materials which are prone to structural deformation or performance degradation due to thermal expansion and contraction. Therefore, fans with volutes made of non-metallic materials can maintain stable performance over a wider range of ambient temperatures, improving the reliability and availability of the fan 20. Furthermore, some non-metallic materials possess excellent damping characteristics, which can absorb and dissipate vibration energy, reducing vibration and noise generated during fan 20 operation.

[0054] Alternatively, the casing may be made of plastic.

[0055] Optionally, such as Figure 7 and Figure 8 As shown, in the axial section of the fan 20, the annular wall 23 bulges towards the side away from the axis. The axis is as follows... Figure 10 As shown by X, the fan's axis is also as shown by X. This increases the airflow area and flow rate within the volute 21, thereby increasing the airflow of the fan 20. It also optimizes the airflow path within the volute 21, reducing eddies and backflow, allowing the airflow to flow more smoothly within the volute 21, thus reducing flow resistance, improving the ventilation efficiency of the fan 20, and reducing noise.

[0056] In some alternative embodiments, in the axial section of the fan 20, the annular wall 23 bulges outward toward the side away from the axis.

[0057] The annular wall 23 is bulging outward from the axis in a drum shape. This means that the profile of the annular wall 23 in the axial section gradually increases from the front and rear sides towards the middle. This not only increases the size of the volute 21 and improves the air volume, but also reduces the dynamic pressure loss caused by the change in cross-sectional area of ​​the airflow in the volute 21, reduces airflow resistance and eddies, improves the smoothness of airflow, and reduces noise.

[0058] In other alternative embodiments, such as Figure 20 As shown, on the axial cross section of the fan 20, the annular wall 23 bulges outwards to the side away from the axis to form multiple protrusions. These multiple protrusions can further change the airflow distribution and flow within the volute 21, so that the fan 20 can adapt to the usage requirements of various scenarios.

[0059] Optionally, multiple protrusions may be arranged sequentially along the axial direction of the fan 20, or multiple protrusions may be arranged sequentially along the circumference of the fan 20. It can be understood that the number and shape of the protrusions formed by the annular wall 23 on the axial section of the fan 20 can be set according to actual needs.

[0060] Optionally, the ring wall 23 is in the shape of a smooth arc, or the ring wall 23 is a multi-segment folded edge structure.

[0061] Optionally, the profile corresponding to the maximum outer diameter of the annular wall 23 corresponds to the center line of the axial direction of the annular wall 23. In this way, after the airflow enters the volute 21, it will be evenly distributed and diffused to both sides of the axial direction along the raised part of the annular wall 23, reducing the generation of eddies and backflow, thereby improving the ventilation efficiency of the fan 20, reducing local resistance, and enhancing the performance of the fan 20.

[0062] Optionally, such as Figure 9 and Figure 21 As shown, in the axial section of the fan 20, the outer ring wall of the impeller 26 bulges towards the side away from the axis.

[0063] In this embodiment, in the axial section of the fan 20, both the annular wall 23 of the volute 21 and the outer wall of the impeller 26 bulge towards the side away from the axis. This not only increases the flow area of ​​the volute 21 and reduces noise, but also allows for a larger impeller 26, increasing airflow and improving its efficiency in working with the airflow, further enhancing the airflow and air pressure output capacity of the fan 20.

[0064] Optionally, the outer wall surface of the impeller 26 is matched with the annular wall 23. That is, the shape of the raised outer wall surface of the impeller 26 is the same as or similar to the shape of the raised annular wall 23. In this way, the impeller 26 and the volute 21 can work together to optimize the airflow and improve the performance of the fan 20.

[0065] In some alternative embodiments, in the axial section of the fan 20, the annular wall 23 bulges outward from the axis, and the outer annular wall of the impeller 26 bulges outward from the axis. Here, the bulging outward from the axis of the outer annular wall of the impeller 26 means that the profile of the outer annular wall of the impeller 26 in the axial section gradually increases from the front and rear sides towards the middle.

[0066] In some alternative embodiments, on the axial section of the fan 20, the annular wall 23 bulges outward toward the side away from the axis to form a plurality of protrusions, and the outer wall surface of the impeller 26 bulges outward toward the side away from the axis to form a plurality of protrusions, with the number of protrusions and protrusions being the same and corresponding one-to-one.

[0067] Optionally, the outer ring wall of the impeller is a smooth arc, or the ring wall 23 is a multi-segment folded edge structure.

[0068] Optionally, the profile of the maximum outer diameter of the impeller 26 corresponds to the profile of the maximum outer diameter of the annular wall 23. This results in a more uniform airflow distribution between the outer edge of the impeller 26 and the annular wall 23 of the volute 21 during rotation. The airflow can smoothly flow from the outer edge of the impeller 26 into the volute 21 and is effectively guided and collected along the profile of the annular wall 23, reducing leakage and backflow in this area. This improves the guiding efficiency and airflow collection effect of the fan 20, thereby enhancing its flow rate and pressure output capacity. Furthermore, due to the correspondence between the profiles of the impeller 26 and the annular wall 23, the pressure distribution between the impeller 26 and the volute 21 is more uniform. During the operation of the fan 20, the pressure change of the airflow between the outer edge of the impeller 26 and the annular wall 23 is more stable, avoiding the generation of local high-pressure or low-pressure areas. This is beneficial to improving the structural strength and service life of the impeller 26 and the volute 21, and also helps to reduce the vibration and noise of the fan 20, thereby improving the stability and reliability of the fan 20 operation.

[0069] It is understandable that the profile of the maximum outer diameter of the outer wall of the impeller 26 and the profile of the maximum outer diameter of the ring wall 23 can be set differently.

[0070] In some optional embodiments, when the profile corresponding to the maximum outer diameter of the annular wall 23 is located on the axial centerline of the annular wall 23, the two sides of the axial centerline of the annular wall 23 are symmetrical. This allows the airflow to be distributed symmetrically and evenly on both sides of the annular wall 23 after entering the volute 21, avoiding problems such as airflow deflection and local eddies caused by structural asymmetry. This improves the uniformity of airflow entering the impeller 26, thereby enhancing the aerodynamic performance of the fan 20, reducing energy loss, and enabling the fan 20 to transport gas more effectively during operation. In addition, the symmetrical structure makes the annular wall 23 more uniformly stressed in the axial direction. During the operation of the fan 20, the rotation of the impeller 26 generates various forces. The symmetrical annular wall 23 structure can better withstand these forces, reducing structural deformation and vibration caused by uneven stress, improving the structural strength and stability of the volute 21, extending the service life of the fan 20, and reducing equipment maintenance costs.

[0071] In some alternative embodiments, the profile corresponding to the maximum outer diameter of the annular wall 23 is located on one side of the centerline of the annular wall 23's axial direction. This allows for directional guidance of airflow within the volute 21, causing the airflow to tend to flow towards the side where the profile is located after entering the volute 21. Airflow can be targeted and guided according to actual application needs, achieving precise control of airflow direction and improving the fan 20's ability to deliver airflow in specific directions. For example, in scenarios requiring enhanced local ventilation or exhaust in specific directions, this better meets usage requirements. Furthermore, by shifting the profile corresponding to the maximum outer diameter of the annular wall 23 to one side of the centerline, a specific local airflow field distribution can be formed inside the fan 20. On the side where the profile corresponding to the maximum outer diameter of the annular wall 23 is located, the airflow will be more concentrated and flow at higher speeds, thereby enhancing the airflow delivery efficiency and pressure in that area; while on the other side, the airflow is relatively dispersed and gentler, providing a certain buffering and flow equalization effect. This makes the airflow parameters (such as velocity and pressure) of the fan 20 at different locations more consistent with the diverse needs of actual applications, improving the overall performance of the fan 20.

[0072] Optionally, such as Figure 9 As shown, the trailing edge of the impeller blades of the impeller 26 is provided with a serrated structure 261.

[0073] In this embodiment, when the airflow passes over the trailing edge of the impeller blades 26, the serrated structure 261 splits the originally continuous large vortex into multiple smaller vortices. The energy of these smaller vortices is relatively dispersed and weaker, and the noise intensity generated during their formation and release is also reduced, thereby effectively reducing the broadband noise caused by vortex shedding during the operation of the fan 20, and reducing vortex noise. In addition, the serrated structure 261 can also streamline and guide the airflow at the trailing edge, making the airflow leave the blades more evenly, reducing local vortices and irregular flow, and lowering airflow pulsation and noise.

[0074] Optionally, such as Figure 9 As shown, the trailing edge of the impeller 26 blades is provided with a chamfer 262 at one or both ends along the axial direction of the fan 20.

[0075] In this embodiment, along the axial direction of the fan 20, when the impeller 26 rotates, the tip of the blade trailing edge may collide or experience severe friction with the surrounding air or other components (such as the volute 21). By providing a chamfer 262 at at least one end of the trailing edge, the contact area and impact intensity between the trailing edge tip and surrounding objects can be reduced, thereby reducing the resulting impact noise and friction noise. The chamfer 262 alters the airflow boundary conditions at the trailing edge, making the airflow at the trailing edge tip smoother and reducing noise sources caused by abrupt changes in airflow. Furthermore, the chamfer arrangement causes the outer ring wall of the impeller to bulge outwards in the axial section of the fan.

[0076] Optionally, such as Figures 10 to 12 As shown in Figure 3, the first housing includes a first annular wall 231, the second housing includes a second annular wall 232, and the annular wall 23 includes the first annular wall 231 and the second annular wall 232. The first housing and the second housing are connected by the first annular wall 231 and the second annular wall 232 to jointly enclose the mounting cavity 211. The first annular wall 231 and the second annular wall 232 are detachably connected.

[0077] In this embodiment, the annular wall 23 includes a first annular wall 231 and a second annular wall 232, which are detachably connected. This allows for easy separation of the first and second housings when the fan 20 malfunctions or requires internal maintenance, eliminating the need for large-scale disassembly or destructive operations on the entire fan 20. This enables rapid location of the fault and subsequent repair or replacement, reducing maintenance time and costs. Simultaneously, it facilitates cleaning of the inside of the volute 21, allowing for thorough cleaning and maintenance of components such as the impeller 26 within the volute 21.

[0078] Optionally, the first annular wall 231 and the second annular wall 232 are detachably connected by plugging and / or screwing.

[0079] Optionally, the first annular wall 231 has a first connecting edge 233 at one end away from the axis, and the second annular wall 232 has a second connecting edge 234 at one end away from the axis; wherein, one of the first connecting edge 233 and the second connecting edge 234 has a protrusion 235, and the other of the first connecting plate 32 and the second connecting edge 234 has a groove 236. When the first annular wall 231 is connected to the second annular wall 232, the first connecting edge 233 and the second connecting edge 234 are in contact and the protrusion 235 is located in the groove 236; and / or, the first connecting edge 233 has a first connecting hole 237, and the second connecting edge 234 has a second connecting hole 238. When the first annular wall 231 is connected to the second annular wall 232, the first connecting edge 233 and the second connecting edge 234 are in contact and the fastener passes through the first connecting hole 237 and the second connecting hole 238.

[0080] In this embodiment, the first annular wall 231 and the second annular wall 232 are connected by a groove 236 and a protrusion 235, which ensures the precise installation of the first annular wall 231 and the second annular wall 232 and serves as a positioning mechanism. The two connecting edges fit together and the protrusion 235 and the groove 236 nest together, which effectively prevents gas leakage at the connection, improves the sealing performance at the connection of the first annular wall 231 and the second annular wall 232, and thus improves the air volume and performance of the fan 20. Fasteners pass through the connecting holes for further fixation, making the two annular walls 23 fit tightly together, enhancing connection stability, improving the sealing effect, and ensuring that the connection will not loosen when the fan 20 is running.

[0081] Optionally, the first connecting edge 233 extends circumferentially along the volute 21, and the length of the first connecting edge 233 matches the circumferential length of the first annular wall 231. The second connecting edge 234 extends circumferentially along the volute 21, and the length of the second connecting edge 234 matches the circumferential length of the second annular wall 232. In this way, the first connecting edge 233 and the second connecting edge 234 can be connected circumferentially in the first annular wall 231 and the second annular wall 232, thereby improving the connection stability and sealing effect.

[0082] Alternatively, the fastener can be a screw or bolt, etc.

[0083] Optionally, the protrusion 235 extends circumferentially along one of the first connecting edge 233 and the second connecting edge 234, and the circumferential length of the protrusion 235 is the same as or similar to the length of one of the first connecting edge 233 and the second connecting edge 234. The groove 236 extends circumferentially along the other of the first connecting edge 233 and the second connecting edge 234, and the circumferential length of the groove 236 corresponds to the protrusion 235. The protrusion 235 and the groove 236 can be inserted into each other circumferentially along the first annular wall 231 and the second annular wall 232, further improving the sealing effect and preventing air leakage.

[0084] Optionally, there are multiple first connecting holes 237, which are arranged sequentially at intervals along the circumference of the first annular wall 231. The number of second connecting holes 238 is the same as the number of first connecting holes 237 and corresponds one-to-one. This can improve the connection strength.

[0085] Optionally, there are multiple protrusions 235, which are arranged sequentially at intervals along the circumference of one of the first connecting edge 233 and the second connecting edge 234. The number of grooves 236 is the same as that of the protrusions 235 and they correspond one-to-one.

[0086] Optionally, when there are multiple protrusions 235 and multiple grooves 236, a first connecting hole 237 or a second connecting hole 238 is provided between adjacent protrusions 235, and a second connecting hole 238 or a first connecting hole 237 is provided between adjacent grooves 236. In this way, the connection is staggered by plug-in and screw connection, which further improves the strength of the connection.

[0087] In some alternative embodiments, such as Figure 10 As shown, the axial length of the first annular wall 231 is the same as the axial length of the second annular wall 232. This ensures that the first and second annular walls 231 and 232 are subjected to uniform stress during operation of the fan 20, preventing deformation of both. The identical axial length also makes the entire volute 21 structure more symmetrical, reducing stress concentration that may result from length differences. This improves the structural strength and stability of the volute 21, making the fan 20 operate more smoothly and reducing vibration and noise.

[0088] In other alternative embodiments, such as Figure 19 As shown, the axial length of the first annular wall 231 is different from the axial length of the second annular wall 232.

[0089] In this embodiment, the volute includes a first annular wall and a second annular wall with different axial lengths. This allows for easy disassembly of the casing corresponding to the shorter axial wall when maintenance is required, while the casing corresponding to the longer axial wall remains stationary or is slightly moved, exposing the internal space of the volute. This facilitates quick and convenient disassembly when minor fan problems do not require impeller removal. Especially in situations with limited operating space, the shorter axial wall faces the inspection port, and the connection point between the two annular walls is also close to the inspection port, facilitating rapid disassembly of parts of the volute for internal maintenance. Furthermore, this embodiment allows the fan to be adapted to different working environments. By altering the airflow path within the volute 21, the airflow distribution at different axial positions is improved, thereby increasing the ventilation efficiency of the fan 20, reducing local resistance, enhancing its performance, reducing noise, and increasing its operational flexibility. This makes it suitable for various working conditions, installation environments, and application scenarios.

[0090] In some alternative embodiments, the profile corresponding to the maximum outer diameter of the annular wall 23 is located at the junction of the first annular wall 231 and the second annular wall 232.

[0091] In this embodiment, the connection between the first annular wall 231 and the second annular wall 232 is a region where the volute 21 experiences relatively complex stress. Setting the profile corresponding to the maximum outer diameter of the annular wall 23 at this location can optimize the stress distribution at the connection. The shape of the profile can distribute the stress at the connection more evenly, reduce stress concentration, and thus improve the structural strength and durability of the volute 21 at this location.

[0092] In some alternative embodiments, the profile corresponding to the maximum outer diameter of the annular wall 23 is located in the first annular wall 231 or the second annular wall 232.

[0093] In this embodiment, based on actual application requirements, the profile corresponding to the maximum outer diameter is set at a specific position on the first annular wall 231 or the second annular wall 232, which can achieve targeted control of airflow. For example, when it is necessary to increase the airflow pressure or change the airflow direction in a certain area of ​​the volute 21, the airflow can be guided by the position of the profile to meet specific airflow organization requirements.

[0094] In some embodiments, the axial length of the first annular wall 231 is the same as the axial length of the second annular wall 232, and the profile corresponding to the maximum outer diameter of the annular wall 23 is located at the connection between the first annular wall 231 and the second annular wall 232.

[0095] In other embodiments, the axial length of the first annular wall 231 is the same as the axial length of the second annular wall 232, and the profile corresponding to the maximum outer diameter of the annular wall 23 is located in the first annular wall 231 or the second annular wall 232.

[0096] In some embodiments, the axial length of the first annular wall 231 is different from the axial length of the second annular wall 232, and the profile corresponding to the maximum outer diameter of the annular wall 23 is located at the connection between the first annular wall 231 and the second annular wall 232.

[0097] In other embodiments, the axial length of the first annular wall 231 is different from the axial length of the second annular wall 232, and the profile corresponding to the maximum outer diameter of the annular wall 23 is located in the first annular wall 231 or the second annular wall 232.

[0098] Optionally, the profile of the maximum outer diameter of the impeller 26 corresponds to the connection between the first annular wall 231 and the second annular wall 232, or the profile of the maximum outer diameter of the impeller 26 corresponds to either the first annular wall 231 or the second annular wall 232.

[0099] Optionally, the first annular wall 231 includes one or more first sub-annular walls, and the plurality of first sub-annular walls are sequentially connected along the axial direction of the fan 20 to form the first annular wall 231; and / or, the second annular wall 232 includes one or more second sub-annular walls, and the plurality of second sub-annular walls are sequentially connected along the axial direction of the fan 20 to form the second annular wall 232.

[0100] In this embodiment, the first annular wall 231 and / or the second annular wall 232 may include multiple sub-annular walls (first sub-annular wall or second sub-annular wall). This makes the shape of the annular wall 23 of the volute 21 more flexible, allowing for precise control of the airflow path within the volute 21. The shape and number of each sub-annular wall can also be set according to different usage scenarios and requirements to ensure smoother airflow within the volute 21 and reduce eddies and energy loss. For example, multiple sub-annular walls can form a wave-shaped annular wall 23 structure, resulting in a more uniform airflow distribution when the fan 20 is large.

[0101] Optionally, at least two of the plurality of first sub-ring walls are detachably connected, and / or at least two of the plurality of second sub-ring walls are detachably connected. This facilitates individual replacement of the sub-ring walls, as well as transportation and maintenance.

[0102] Optionally, the multiple first sub-ring walls are integral structures, and / or the multiple second sub-ring walls are integral structures, which can improve the strength of the ring wall 23 and ensure sealing.

[0103] In some alternative embodiments, the cover plate 22 includes a first cover plate 221 and a second cover plate 222. The first housing also includes the first cover plate 221, which is connected to the end of the first annular wall 231 away from the second annular wall 232 and has an air inlet 2211. The second housing also includes the second cover plate 222, which is connected to the end of the second annular wall 232 away from the first annular wall 231 and has a motor mounting port. The first cover plate 221 and the first annular wall 231 are integral structures, and / or the second cover plate 222 and the second annular wall 232 are integral structures.

[0104] In this embodiment, the first cover plate 221 and the second cover plate 222 are arranged along the axial direction of the fan 20. The first cover plate 221, the first annular wall 231, the second cover plate 222, and the second annular wall 232 together enclose the mounting cavity 211. The first cover plate 221 and the first annular wall 231, and the second cover plate 222 and the second annular wall 232 adopt an integrated structure, reducing the number of connections between components and avoiding structural failure due to weak connections. This makes the overall structure of the volute 21 more robust and better able to withstand various loads and stresses generated during the operation of the fan 20, such as airflow pressure, centrifugal force generated by the rotation of the impeller 26, and impact forces that may be brought by the external environment, thereby improving the reliability and service life of the fan 20. The integrated structure eliminates the need for additional assembly between the cover plate 22 and the annular wall 23, and eliminates connection gaps and assembly errors, allowing for smoother and more fluid airflow within the volute 21. The integrated structure also increases the strength of the volute 21, avoiding or reducing deformation of the volute 21. In addition, the volute 21 is made of non-metallic material, which makes the integrated structure of the first cover plate 221 and the first annular wall 231, and the second cover plate 222 and the second annular wall 232 easier to process and assemble, thus improving production efficiency.

[0105] Optionally, such as Figure 10 As shown, a chamfer 24 is formed at the connection between the first cover plate 221 and the first annular wall 231 and / or at the connection between the second cover plate 222 and the second annular wall 232; wherein, the radius of the chamfer 24 gradually changes along the circumference of the volute 21.

[0106] In this embodiment, the chamfer 24 allows the airflow to flow more smoothly when entering the volute 21 or passing through the connection between the cover plate and the annular wall, avoiding airflow separation and eddies caused by right angles or acute angles. The chamfer 24 with a gradually changing radius can gradually guide the airflow to change direction according to the changes in airflow direction and speed, further reducing airflow disturbance and energy loss, thereby improving the airflow delivery efficiency of the fan 20.

[0107] Optionally, chamfer 24 is a rounded chamfer. A rounded chamfer refers to connecting the cover plate 22 and the annular wall 23 with an arc. The radius of chamfer 24 refers to the radius of this arc. Specifically, a rounded chamfer connects two mutually perpendicular surfaces using a quarter-circle arc. The radius of this arc is the fillet radius.

[0108] Optionally, the radius of the chamfer 24 gradually increases along the airflow direction within the volute 21. This causes changes in the airflow velocity and direction as it enters from the inlet of the volute 21 and flows along its inner wall. The gradually increasing radius of the chamfer 24 better guides the airflow smoothly from right-angled or acute-angled regions into the interior of the volute 21, allowing the airflow to gradually diffuse and decrease in velocity, thereby reducing localized eddies and non-uniformity. It can be understood that the radius of the chamfer 24 can also remain constant, or it can gradually decrease along the airflow direction.

[0109] Optionally, the fan 20 also includes a check valve 25, which is located at the air outlet of the volute 21 and is an integral structure with the volute 21.

[0110] In this embodiment, the check valve 25 effectively prevents airflow from flowing back into the fan 20, ensuring unidirectional gas flow. It also prevents external gas backflow when the fan 20 stops operating or malfunctions. The check valve 25 and the volute 21 are an integral structure, improving the connection strength between them and ensuring a tight fit between the check valve 25 and the outlet of the volute 21. This makes the airflow smoother during discharge, preventing air leakage and reducing eddies and energy loss.

[0111] This disclosure provides a fan that includes the volute of any of the above embodiments, and thus has the beneficial effects of the volute of any of the above embodiments, which will not be repeated here.

[0112] This disclosure also provides a range hood, which includes the fan of any of the above embodiments.

[0113] The range hood provided in this disclosure includes the fan of any of the above embodiments, and therefore has the beneficial effects of the fan of any of the above embodiments, which will not be repeated here.

[0114] like Figures 13 to 18 As shown, the range hood includes a fan 20 and a noise reduction plate 40. The noise reduction plate 40 is located on the side of the ring wall 23 away from the axis. The noise reduction plate 40 and the ring wall 23 enclose a sound-absorbing cavity 42. The noise reduction plate 40 has a noise reduction hole 41 that communicates with the sound-absorbing cavity 42. The noise reduction hole 41 penetrates the noise reduction plate 40 and connects the sound-absorbing cavity 42 with the outside. In the axial section of the fan 20, the ring wall 23 bulges towards the side away from the axis, and the noise reduction plate 40 also bulges towards the side away from the axis.

[0115] In this embodiment, the noise reduction plate 40 and the annular wall 23 enclose a sound-absorbing cavity 42, and the noise reduction plate 40 has a noise reduction hole 41 that communicates with the sound-absorbing cavity 42. When the airflow enters the sound-absorbing cavity 42 through the noise reduction hole 41, the noise undergoes multiple reflections and interferences within the sound-absorbing cavity 42, and the energy is effectively attenuated, thereby achieving noise reduction of the fan 20. The noise reduction plate 40 is located on the side of the annular wall 23 away from the axis, that is, the noise reduction plate 40 is located on the outside of the volute 21. In this way, the noise reduction plate 40 is not exposed to the high-speed airflow inside the volute 21, and is not easy to fall off, deform, or age. Moreover, this embodiment uses a sound-absorbing cavity 42 and a sound-absorbing hole for noise reduction, so there is no attenuation problem, which improves the noise reduction effect and service life. The annular wall 23 of the volute 21 bulges away from the axis in the axial section, which optimizes the airflow path in the volute 21, reduces the generation of eddies and backflow, and makes the airflow flow more smoothly, thereby reducing flow resistance and further reducing the noise of the fan 20. The noise reduction plate 40 also bulges away from the axis in the axial section, which can also optimize the airflow distribution in the silencing cavity 42, improve the noise reduction effect, and improve the structural strength of the noise reduction plate 40, prevent the noise reduction plate 40 from deforming, and thus ensure the long-term use and long-term noise reduction effect of the noise reduction plate 40.

[0116] Optionally, there are multiple noise reduction holes 41, which are arranged in an array on the noise reduction plate 40.

[0117] Optionally, the shape of the noise reduction aperture 41 can be circular, elliptical, polygonal, or irregular.

[0118] Optionally, such as Figure 14 As shown, the noise reduction plate 40 is bulging in a drum shape along a direction away from the axis.

[0119] In this embodiment, the drum-shaped bulge of the annular wall 23 improves the airflow path within the volute 21, increasing air volume and reducing noise. The noise-reducing plate 40 also has a drum-shaped bulge, which extends the sound wave propagation path within the silencing cavity 42, increases the number of sound wave reflections, and improves sound energy loss, further enhancing the noise reduction effect. Simultaneously, the bulging structure alters the direction of sound wave propagation, reducing noise radiated outwards.

[0120] Optionally, the noise reduction plate 40 and the ring wall 23 are matched in shape and size along the axial direction of the fan 20. Here, it means that the shape and size of the noise reduction plate 40 along the axial direction of the fan 20 are the same as or similar to the shape and size of the ring wall 23 along the axial direction of the volute 21. This ensures the area of ​​the silencing cavity 42, improves the noise reduction effect, and does not increase the size of the range hood, making it easier to install the fan 20.

[0121] Optionally, the noise reduction plate 40 extends in an arc shape along the circumference of the volute 21, which can better cooperate with the volute 21 to form a sound-absorbing cavity 42, and also allows the oil in the noise reduction plate 40 to flow quickly into the guide groove.

[0122] Optionally, the circumferential length of the noise reduction plate 40 is less than or equal to half the circumferential length of the volute 21, which can prevent the noise reduction plate 40 from being too long and interfering with other components in the air duct 11.

[0123] Optionally, the lowest point of the noise reduction plate 40 corresponds to the lowest point of the annular wall 23 to improve oil drainage efficiency and thoroughness.

[0124] Optionally, the noise reduction plate 40 can be detachably connected to the volute 21 to facilitate the disassembly of the volute 21 and the noise reduction plate 40, thereby facilitating the cleaning, maintenance and replacement of the volute 21 and the noise reduction plate 40 separately.

[0125] Optionally, the wall surface of the noise reduction plate 40 facing the volute 21 has a slot 45, and the wall surface of the volute 21 facing the noise reduction plate 40 has a protrusion 271. When the noise reduction plate 40 is connected to the volute 21, the protrusion 271 is located within the slot 45. The connection method of the protrusion 271 and the slot 45 is simple to operate and can play a positioning role, ensuring the installation accuracy of the noise reduction plate 40 and the volute 21 and avoiding deviations.

[0126] Optionally, the groove wall of the insertion slot 45 is provided with a first through hole 451, which penetrates the noise reduction plate 40 along the thickness direction. The insertion protrusion 271 is provided with a second through hole 272. When the insertion protrusion 271 is located in the insertion slot 45, the first through hole 451 and the second through hole 272 correspond to each other. Fasteners (hereinafter referred to as second fasteners for ease of description) pass through the first through hole 451 and the second through hole 272 to connect the noise reduction plate 40 and the volute 21.

[0127] In this embodiment, after the insertion protrusion 271 is inserted into the insertion slot 45, it can also be connected and fixed by the second fastener, thereby realizing the connection between the noise reduction plate 40 and the volute 21 and improving the connection stability.

[0128] Optionally, the insertion protrusion 271 extends downward from the outer wall of the annular wall 23, and the upper end of the insertion groove 45 and the end facing the volute 21 are open, so that the insertion protrusion 271 can be inserted into the insertion groove 45 from above and from the side.

[0129] Optionally, the first through hole 451 extends vertically, and the second through hole 272 extends vertically, with the second through hole 272 penetrating the noise reduction plate 40. The second fastener can pass through the second through hole 272 and the first through hole 451 sequentially from below the noise reduction plate 40. This ensures that the second fastener will not deviate during assembly and also improves the ease of installation of the noise reduction plate 40.

[0130] Optionally, the noise reduction plate 40 includes a third end and a fourth end that are arranged opposite each other in the circumferential direction. The third end and the fourth end of the noise reduction plate 40 are provided with a plug-in groove 45, and the plug-in protrusion 271 corresponds to the plug-in groove 45. In this way, the noise reduction plate 40 is connected to the volute 21 from the edge. The plug-in protrusion 271, the plug-in groove 45 and the second fastener will not affect the noise reduction effect of the silencing cavity 42, and can also improve the stability of the connection and prevent the noise reduction plate 40 from falling off.

[0131] Optionally, there are multiple insertion protrusions 271, the number of insertion slots 45 is the same as the number of insertion protrusions 271 and corresponds one-to-one, the number of first through holes 451 is the same as the number of insertion protrusions 271 and corresponds one-to-one, and the number of second through holes 272 is the same as the number of first through holes 451 and corresponds one-to-one.

[0132] Optionally, when the annular wall 23 includes a first annular wall 231 and a second annular wall 232, the noise reduction plate 40 is connected to both the first annular wall 231 and the second annular wall 232. This not only improves the connection stability of the noise reduction plate 40, but also allows the noise reduction plate 40 to further connect and limit the first annular wall 231 and the second annular wall 232, preventing them from separating.

[0133] Optionally, the noise reduction plate 40 is located below the ring wall 23. The bottom of the ring wall 23 is provided with an oil drain port 27. The noise reduction plate 40 is provided with an oil guide groove 43 and an oil drain port 44. The oil guide groove 43 corresponds to the oil drain port 27. The oil drain port 44 is located at the lowest point of the oil guide groove 43. The bottom wall of the oil guide groove 43 slopes downward toward the direction close to the oil drain port 44.

[0134] In this embodiment, the noise reduction plate 40 can work with the volute 21 to form a sound-absorbing cavity 42 for noise reduction. Simultaneously, the oil inside the volute 21 can be discharged through the oil drain port 27. The oil guide groove 43 of the noise reduction plate 40 corresponds to the oil drain port 44, thus the oil guide groove 43 receives the oil inside the volute 21, preventing oil accumulation and affecting the normal operation of the fan 20. Furthermore, the oil guide groove 43 is connected to the oil drain port 44, and the oil drain port 44 is located at the lowest point of the oil guide groove 43. The bottom wall of the oil guide groove 43 slopes downwards towards the oil drain port 44, allowing the oil flowing into the oil guide groove 43 to be quickly discharged from the oil drain port 44 under the guidance of the bottom wall of the oil guide groove 43. This effectively removes the oil accumulated on the oil guide groove 43 and the noise reduction plate 40, preventing oil accumulation on the noise reduction plate 40 or the guide groove, which could block the noise reduction holes 41 and affect the noise reduction effect and the normal operation of the fan 20.

[0135] Optionally, the oil drain 27 is located at the lowest point of the annular wall 23 so that the oil in the volute 21 can be effectively discharged from the oil drain 27.

[0136] Optionally, the oil guide groove 43 is located at the lowest point of the noise reduction plate 40, so that the oil in the noise reduction plate 40 can also flow effectively into the oil guide groove 43 and then be discharged from the oil drain port 44.

[0137] Optionally, the noise reduction plate 40 includes a first end 46 and a second end 47 disposed opposite to each other along the axial direction of the fan 20; wherein, the oil drain port 44 is disposed between the first end 46 and the second end 47.

[0138] In this embodiment, the oil drain port 44 is located at the lowest point of the oil guide groove 43. The position of the oil drain port 44 can be set according to actual needs. When the oil drain port 44 is set between the first end 46 and the second end 47, there are guide grooves around the oil drain port 44. The bottom wall of the oil guide groove 43 around the oil drain port 44 is inclined downward towards the direction close to the oil drain port 44. In this way, the oil in the oil guide groove 43 can flow quickly to the oil drain port 44 and be discharged from the guide groove.

[0139] Optionally, the noise reduction plate 40 includes a first end 46 and a second end 47 disposed opposite to each other along the axial direction of the fan 20, and an oil drain port 44 is disposed on the side of the first end 46 away from the second end 47, or the oil drain port 44 is disposed on the side of the second end 47 away from the first end 46.

[0140] In this embodiment, the oil outlet 44 is located on the outside of the first end 46 or the outside of the second end 47. That is, the oil guide groove 43 extends to the side of the first end 46 away from the second end 47, or the oil guide groove 43 extends to the side of the second end 47 away from the first end 46. The oil guide groove 43 protrudes from the noise reduction plate 40 in the axial direction of the fan 20. This increases the flow path and the capacity of the guide groove, thereby increasing the oil storage capacity. The oil outlet 44 is located at the lowest point of the guide groove. The oil in the oil guide groove 43 flows from one side of the oil outlet 44 to the oil outlet 44. Even when there is a lot of oil in the oil outlet 44, the oil in the oil guide groove 43 will not overflow into the noise reduction plate 40, thus preventing the oil from clogging the noise reduction hole 41 and ensuring the noise reduction effect.

[0141] Optionally, the first end 46 and the second end 47 are arranged along the direction from the first cover plate 221 to the second cover plate 222. The oil guide groove 43 extends to the side of the first end 46 away from the second end 47. The bottom wall of the oil guide groove 43 slopes downward in the direction away from the second end 47, and the oil outlet 44 is located at the lowest point of the guide groove. In this way, the oil guide groove 43 extends towards the air inlet 2211, which can avoid interference between the oil guide groove 43 and the motor 28 or the connection device of the motor 28, so as to ensure the normal operation of the fan 20.

[0142] Optionally, the noise reduction plate 40 includes a third end and a fourth end that are arranged opposite each other along the circumference of the volute 21, with the distance from the third end to the guide groove being the same as the distance from the fourth end to the oil guide groove 43. This makes the noise reduction plate 40 symmetrically arranged in the circumference, improving the uniformity of the appearance.

[0143] This disclosure also provides a range hood, such as... Figures 1 to 6 As shown, the range hood includes a fan 20, a housing 10, and a motor bracket 30. The housing 10 defines an air duct 11. The fan 20 is located inside the air duct 11 and is used to drive the airflow within the air duct 11. The fan 20 includes a volute 21, a motor 28, and an impeller 26. The impeller 26 is located inside the volute 21. The motor 28 is connected to the impeller 26 and is used to drive the impeller 26 to rotate, thereby driving the airflow within the air duct 11 to flow into the volute 21 from the air inlet 2211 and then out of the air outlet of the volute 21 before flowing back into the air duct 11. The motor bracket 30 is connected to both the volute 21 and the housing 10, and the motor 28 is mounted on the motor bracket 30.

[0144] In this embodiment, the motor bracket 30 is used to mount the motor 28 to achieve stable installation of the motor 28. The motor bracket 30 is connected to both the volute 21 and the outer shell 10, so that the weight of the motor 28 is shared by the volute 21 and the outer shell 10. Similarly, the vibration generated by the motor 28 during operation can also be distributed to the volute 21 and the outer shell 10 through the motor bracket 30, reducing the stress on the volute 21, avoiding or mitigating the deformation of the volute 21, thereby reducing noise and ensuring user experience.

[0145] Optionally, the motor bracket 30 is a one-piece structure. This increases the strength of the motor bracket 30, effectively distributing and bearing these forces, reducing component loosening and deformation caused by vibration, and improving the reliability and stability of the fan 20. Furthermore, since the motor bracket 30 is a one-piece structure, there is no need to splice and assemble multiple bracket components during fan 20 installation, reducing assembly complexity and difficulty, improving assembly efficiency, and minimizing potential errors during assembly.

[0146] Optionally, the motor bracket 30 is detachably connected to the volute 21, and / or the motor bracket 30 is detachably connected to the housing 10. This facilitates the disassembly, inspection, and replacement of the motor bracket 30.

[0147] Optionally, the motor bracket 30 and the volute 21 can be detachably connected by means of screws, bolts, magnetic attraction or plug-in.

[0148] Optionally, the motor bracket 30 and the housing 10 can be detachably connected by means of screws, bolts, magnetic attraction or plug-in.

[0149] Optionally, such as Figure 3 and Figure 4 As shown, the motor bracket 30 includes a mounting ring 31 and a connecting plate 32. The mounting ring 31 is located inside the volute 21 and is used to mount the motor 28. The connecting plate 32 is connected to the mounting ring 31 and extends from the mounting ring 31 to the outside of the volute 21. The connecting plate 32 is connected to both the outer shell 10 and the volute 21. The mounting ring 31 is an integral closed circular ring structure.

[0150] In this embodiment, the mounting ring 31 is located inside the volute 21 for mounting the motor 28. The connecting plate 32 extends to the outside of the volute 21 for connecting to the outer casing 10. The connecting plate 32 also connects to the volute 21. The mounting ring 31 is an integral circular structure, so that when the motor bracket 30 is subjected to force, the mounting ring 31 can bear the force evenly in the circumference, thereby balancing the force on the motor bracket 30, preventing deformation of the motor bracket 30, and improving the strength of the motor bracket 30.

[0151] Optionally, the motor 28 is connected to the mounting ring 31 by screws. Specifically, the mounting ring 31 has a plurality of screw holes along its circumference to facilitate the fixing of the motor 28 to the mounting ring 31 by screws.

[0152] Optionally, the connecting plate 32 includes a support plate 33 and a first connecting flange 34. One end of the support plate 33 is connected to the mounting ring 31, and the other end of the support plate 33 extends to the outside of the volute 21. The first connecting flange 34 is connected to the other end of the support plate 33. The first connecting flange 34 is connected between the outer shell 10 and the volute 21.

[0153] In this embodiment, one end of the support plate 33 is connected to the mounting ring 31, and the other end extends to the outside of the volute 21 and connects with the outer shell 10 and the volute 21, forming a stable support structure. The support plate 33 can effectively transmit the weight and vibration of the motor 28 to the outer shell 10 and the volute 21, making the support of the motor 28 more robust and reliable. The first connecting flange 34 increases the contact area between the connecting plate 32 and the outer shell 10 and the volute 21, making the connection tighter and more robust, thereby improving the connection strength and reliability between the motor bracket 30 and other components of the fan 20.

[0154] In some alternative embodiments, the first connecting flange 34 is a single-layer flange that connects to both the volute 21 and the outer shell 10. For example, the single-layer flange has a connecting through hole, through which a screw or bolt passes to the outer shell 10, the connecting through hole, and the volute 21 to achieve connection.

[0155] In some alternative embodiments, the first connecting flange 34 includes a first flange 341 and a second flange 342. The first flange 341 is connected to the outer shell 10; the second flange 342 is connected to the side of the first flange 341 facing the volute 21 and is connected to the volute 21.

[0156] In this embodiment, the first flange 341 is connected to the outer casing 10, and the second flange 342 is connected to the volute 21. This allows the load borne by the motor bracket 30 to be transferred to the outer casing 10 and the volute 21 respectively through the two flanges, distributing the load and preventing excessive stress on a single connection point. This improves the overall strength and stability of the connection between the motor bracket 30 and the outer casing 10 and the volute 21. Furthermore, the double-layer flange structure reduces loosening and damage caused by vibration and impact of the motor 28, ensuring the stability of the motor bracket 30. In addition, the first flange 341 and the second flange 342 provide installation positions for the motor bracket 30 to the outer casing 10 and the volute 21 respectively, facilitating assembly and improving assembly efficiency.

[0157] Optionally, the first flange 341 and the second flange 342 are spaced apart, so that the gap between the first flange 341 and the second flange 342 can provide installation space for the connector between the outer shell 10 and the first flange 341, and also provide operation space for the connection between the second flange 342 and the volute 21.

[0158] Optionally, the first flange 341 and the second flange 342 are set in parallel, or the first flange 341 and the second flange 342 are set out of parallel.

[0159] Optionally, the first flange 341 is provided with a first connecting through hole 3411, and the second flange 342 is provided with a second connecting through hole 3421. The first connecting hole and the second connecting through hole 3421 are corresponding to each other and spaced apart. In this way, the first connecting through hole 3411 is used to connect with the outer shell 10, and the second connecting through hole 3421 is used to connect with the volute 21.

[0160] Optionally, the second flange 342 is connected to the side of the volute 21 facing the outer casing 10, or the second flange 342 is connected to the side of the volute 21 facing the mounting cavity 211.

[0161] This allows for more flexible positioning of the second flange 342. It can be positioned on the outside of the volute 21 for ease of installation and operation. Alternatively, the second flange 342 can be positioned on the inside of the volute 21, allowing it to not only connect to the volute 21 but also serve as a limiting element to prevent the motor bracket 30 from moving.

[0162] Optionally, the housing 10 includes a housing body and a plurality of reinforcing plates 14, the plurality of reinforcing plates 14 being disposed on the side of the housing body facing the air duct 11, and the plurality of reinforcing plates 14 being spaced apart; wherein, the first connecting flange 34 is connected between at least two reinforcing plates 14.

[0163] In this embodiment, multiple reinforcing plates 14 are spaced apart on the side of the outer shell facing the air duct 11, which can significantly enhance the rigidity of the outer shell 10. This reduces the deformation of the outer shell 10 when subjected to loads such as airflow pressure in the air duct 11 and vibration generated during the operation of the fan 20. The outer shell 10 is connected to the first connecting flange 34 by the reinforcing plates 14, providing a solid connection foundation for the first connecting flange 34, increasing the contact area and strength of the connection, and preventing the motor bracket 30 from separating from the outer shell 10 under force. This makes the connection between the motor bracket 30 and the outer shell 10 more secure and reliable, and can better resist external forces such as vibration and impact during the operation of the fan 20, reducing the possibility of loosening the connection and ensuring the long-term stable operation of the fan 20.

[0164] The first connecting flange 34 is connected between at least two reinforcing plates 14, so that the connection force between the motor bracket 30 and the housing 10 can be distributed and transmitted through the reinforcing plates 14, avoiding stress concentration in a few parts and reducing the risk of damage to the connection between the housing 10 and the motor bracket 30 due to excessive stress.

[0165] Optionally, when the first connecting flange 34 is connected to the outer casing 10, the first connecting flange 34 is close to the wall of the outer casing 10 facing the air duct 11, which can increase the connection area and thus increase the connection strength.

[0166] Optionally, when the first connecting flange 34 is connected to the outer casing 10, the first flange 341 abuts against the wall of the outer casing 10 facing the air duct 11.

[0167] Optionally, the first end face of the reinforcing plate 14 abuts against the outer shell body, and the second end face of the reinforcing plate 14 abuts against the first connecting flange 34. This not only improves the connection strength of the reinforcing plate 14, but also ensures the connection strength of the motor bracket 30.

[0168] Optionally, the volute 21 includes a second cover plate 222, which has a motor mounting port 2221. When the first connecting flange 34 is connected to the volute 21, the first connecting flange 34 is close to the second cover plate 222 to increase the connection area between the motor bracket 30 and the second cover plate 222, thereby increasing the connection strength.

[0169] Optionally, when the first connecting flange 34 includes a second flange 342, the second flange 342 abuts against the second cover plate 222.

[0170] Optionally, the second flange 342 abuts against the side of the second cover plate 222 away from the mounting cavity 211, or the second flange 342 abuts against the side of the second cover plate 222 facing the outer casing 10.

[0171] Optionally, such as Figure 5 and Figure 6As shown, the outer casing 10 includes a mounting side plate, a reinforcing plate 14 is disposed on the side of the mounting side plate facing the air duct 11, and the fan 20 is inclinedly disposed in the air duct 11. Along the direction from bottom to top, the distance between the second cover plate 222 and the reinforcing plate 14 gradually decreases. In the same direction from bottom to top, the distance between the first flange 341 and the second cover plate 222 gradually decreases, so that the first flange 341 is always in contact with the reinforcing plate 14.

[0172] Optionally, the plurality of reinforcing plates 14 include a first reinforcing plate 141 and a second reinforcing plate 142, wherein the distance between the first reinforcing plate 141 and the volute 21 is less than the distance between the second reinforcing plate 142 and the volute 21, and a first flange 341 is connected between the first reinforcing plate 141 and the second reinforcing plate 142, wherein, along the direction from the first reinforcing plate 141 to the second reinforcing plate 142, the first flange 341 is inclined in a direction away from the volute 21.

[0173] Optionally, there are multiple support plates 33, including a first support plate 331 and a second support plate 332. The other end of the first support plate 331 is connected to the first connecting flange 34. The second support plate 332 and the first support plate 331 are spaced apart along the circumference of the mounting ring 31. The connecting plate 32 also includes a second connecting flange 35, which is connected to the other end of the second support plate 332 and connected to one or more reinforcing plates 14.

[0174] In this embodiment, the arrangement of multiple support plates 33 can distribute the load of the motor bracket 30, allowing the weight and vibration of the motor 28 to be transmitted to the outer shell 10 and / or the volute 21 through different paths. This avoids a single support plate 33 bearing excessive load, thereby improving the stability and reliability of the motor bracket 30. The second connecting flange is connected to the reinforcing plate 14, that is, the second connecting flange 35 is connected to the outer shell 10. Thus, the first connecting flange 34 is connected to both the outer shell 10 and the volute 21, and the second connecting flange 35 is connected to the outer shell 10. This increases the connection point between the motor bracket 30 and the outer shell 10. In this way, the outer shell 10 can not only improve the connection stability of the motor bracket 30, but also distribute more vibration and deformation, preventing the motor bracket 30 from deforming or being damaged.

[0175] Optionally, the second connecting flange 35 is connected to a reinforcing plate 14, and the second connecting flange 35 is abutted against the reinforcing plate 14.

[0176] Optionally, the first connecting flange 34 and the second connecting flange 35 are staggered along the circumference of the mounting ring 31, so that the force on the first connecting flange 34 and the second connecting flange 35 can be evenly transmitted to the mounting ring 31, improving the uniformity of the force on the motor bracket 30 and preventing deformation of the motor bracket 30.

[0177] Optionally, a reinforcing plate 14 includes a first connecting portion and a second connecting portion. The first connecting portion is connected to a first connecting flange 34, and the second connecting portion is connected to a second connecting flange 35. Here, since the first connecting flange 34 connects at least two reinforcing plates 14, the structure of multiple reinforcing plates 14, the first connecting flange 34, and the second connecting flange 35 forms a closed support structure with the reinforcing plates 14 and the volute 21. This further improves the connection strength of the motor support 30, and the force and vibration of the motor support 30 can be dispersed in multiple directions, improving the shock absorption effect.

[0178] Optionally, the plurality of reinforcing plates 14 include a first reinforcing plate 141 and a second reinforcing plate 142 arranged sequentially from top to bottom. Both ends of the first reinforcing plate 141 and the second reinforcing plate 142 are connected to the left and right side walls of the outer shell 10. A first connecting flange 34 is connected between the first reinforcing plate 141 and the second reinforcing plate 142, and a second connecting flange 35 is connected to either the first reinforcing plate 141 or the second reinforcing plate 142.

[0179] Optionally, the two first connecting flanges and the two second connecting flanges are staggered along the circumference of the mounting ring. The two first connecting flanges 34 are arranged opposite each other in the left-right direction, and the two second connecting flanges 35 are spaced apart in the up-down direction. Both first connecting flanges 34 are connected to the first reinforcing plate 141 and the second reinforcing plate 142. One of the two second connecting flanges 35 is connected to the first reinforcing plate 141, and the other is connected to the second reinforcing plate 142. In this way, the connecting plate 32 of the motor bracket 30 is not only directly connected to the reinforcing plate 14, but also indirectly connected through the reinforcing plate 14, forming an integrated frame structure. This improves the installation stability of the motor bracket 30 and enhances its resistance to deformation and vibration.

[0180] The foregoing description and accompanying drawings fully illustrate embodiments of the present disclosure to enable those skilled in the art to practice them. Other embodiments may include structural and other changes. The embodiments represent only possible variations. Individual components and functions are optional unless explicitly required, and the order of operation may vary. Parts and features of some embodiments may be included or substituted for parts and features of other embodiments. Embodiments of the present disclosure are not limited to the structures described above and shown in the accompanying drawings, and various modifications and changes may be made without departing from its scope. The scope of the present disclosure is limited only by the appended claims.

Claims

1. A volute, characterized in that, include: The first housing includes a first annular wall; The second housing includes a second annular wall, and the first housing and the second housing are detachably connected by the first annular wall and the second annular wall to jointly enclose the mounting cavity; The axial length of the first ring wall is different from that of the second ring wall.

2. The volute according to claim 1, characterized in that, The first and second annular walls are connected to form an annular wall, which bulges toward the side away from the axis in the axial section of the volute.

3. The volute according to claim 2, characterized in that, The profile corresponding to the maximum outer diameter of the ring wall is located at the junction of the first and second ring walls, or the profile corresponding to the maximum outer diameter of the ring wall is located on either the first or second ring wall.

4. The volute according to claim 1, characterized in that, The first housing also includes: The first cover plate is connected to the end of the first ring wall away from the second ring wall and has an air inlet. The second housing also includes: The second cover plate is connected to the end of the second ring wall away from the first ring wall and has a motor mounting port. The first cover plate and the first annular wall are integral structures, and / or the second cover plate and the second annular wall are integral structures.

5. The volute according to claim 1, characterized in that, The first annular wall includes one or more first sub-annular walls, which are sequentially connected along the axial direction of the volute to form the first annular wall; and / or, The second annular wall includes one or more second sub-annular walls, which are sequentially connected along the axial direction of the volute to form the second annular wall.

6. The volute according to any one of claims 1 to 5, characterized in that, The volute is made of non-metallic material.

7. A fan, characterized by Includes the volute as described in any one of claims 1 to 6.

8. The fan of claim 7, wherein, Also includes: The impeller is located inside the mounting cavity; In the axial section of the fan, the outer wall of the impeller bulges towards the side away from the axis.

9. The fan according to claim 8, characterized in that, The profile of the impeller's maximum outer diameter corresponds to the profile of the volute's maximum outer diameter.

10. A range hood characterized by Includes the wind turbine as described in any one of claims 7 to 9.

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