Fan volute, fan and heating and ventilation device

Abstract

The utility model discloses a fan volute, fan and heating and ventilation equipment, fan volute includes: volute body and current collector. Volute body has the air inlet, the air outlet and the air channel, and the air channel is linked with the air inlet and the air outlet and includes the wind wheel cavity for accommodating the wind wheel, the current collector is set up around the air inlet, and the current collector includes the main part and the tail portion along the axial arrangement of current collector, and the main part is connected with volute body, and the tail portion is located in the air channel and is connected in the side of main part near the wind wheel cavity, and the tail portion forms the rectification tooth structure, and the rectification tooth structure includes a plurality of rectification teeth along the circumferential setting of tail portion, and the thickness size of the tooth top of rectification tooth in the radial direction of current collector is t1, and the thickness size of the tooth root of rectification tooth in the radial direction of current collector is t2, and t1 The fan volute of the utility model embodiment, through setting rectification tooth structure in the tail portion of current collector, has broken the periodicity of vortex, reduced the noise.

Description

Technical Field

[0001] This utility model relates to the field of fan technology, and in particular to a fan casing, a fan, and HVAC equipment. Background Technology

[0002] The air collector installed at the air inlet of the fan primarily guides airflow from the outside of the volute into the impeller inside the volute. The structural design of the air collector in related technologies is not reasonable enough, resulting in turbulence on the inner wall of the air collector and separation vortices on the end face, leading to high noise levels during fan operation. Therefore, improvements are needed. Utility Model Content

[0003] The present invention aims to at least solve one of the technical problems existing in the prior art. Therefore, one objective of the present invention is to provide a fan volute, wherein when a fan with this volute is operating, the noise generated during the airflow process from the collector to the impeller is low.

[0004] This utility model also proposes a fan having the above-mentioned fan volute.

[0005] This utility model also proposes a heating, ventilation and air conditioning device having the above-mentioned fan.

[0006] According to a first aspect of the present invention, a wind turbine volute includes: a volute body having an air inlet, an air outlet, and an air duct, the air duct connecting the air inlet and the air outlet and including a wind turbine cavity for accommodating a wind turbine; and a collector surrounding the air inlet, the collector including a main body and a tail portion arranged axially along the collector, the main body being connected to the volute body, the tail portion being located within the air duct and connected to the side of the main body near the wind turbine cavity, the tail portion forming a rectifier tooth structure, the rectifier tooth structure including a plurality of rectifier teeth arranged circumferentially along the tail portion, the thickness of the tooth tip of the rectifier tooth in the radial direction of the collector being t1, the thickness of the tooth root of the rectifier tooth in the radial direction of the collector being t2, where t1 < t2.

[0007] According to the embodiment of the present invention, the fan volute has a rectifier tooth structure at the tail of the collector. When the fan with the fan volute is working, the airflow entering from the air inlet is guided to the impeller cavity by the collector. When the airflow flows to the tail of the collector, the rectifier tooth structure at the tail of the collector can disrupt the periodicity of the vortex, decompose the large vortex into smaller and more dispersed vortices, thereby reducing the noise intensity of the vortex falling off the tail and reducing the noise generated when the airflow is introduced into the impeller cavity from the air inlet through the collector. Furthermore, by making the thickness of the tooth root of the rectifier tooth in the radial direction of the collector greater than the thickness of the tooth tip of the rectifier tooth in the radial direction of the collector, the risk of stress concentration at the tooth root of the rectifier tooth is reduced, and the tooth root of the rectifier tooth is less likely to break when the airflow generates vortices.

[0008] According to some embodiments of this utility model, 0.4≤t1 / t2≤0.8.

[0009] According to some embodiments of the present invention, the surface of the rectifier tooth includes an inner tooth surface, which extends obliquely toward the direction away from the central axis of the collector in a direction along the axial direction of the collector and close to the impeller cavity.

[0010] According to some embodiments of this utility model, the tooth length h of the rectifier tooth satisfies: 1.2mm≤h≤1.8mm.

[0011] According to some embodiments of the present invention, the width L1 of the tooth tip of the rectifier tooth in the circumferential direction of the collector satisfies: 1.2mm≤L1≤1.6mm.

[0012] According to some embodiments of the present invention, the rectifier tooth includes two tooth lateral faces arranged opposite each other along the circumference of the collector, and the included angle θ between the tooth lateral face and the tooth tip of the rectifier tooth satisfies: 96°≤θ≤108°.

[0013] According to some embodiments of this utility model, the tooth tip is a plane, an arc surface, or a sharp angle.

[0014] According to some embodiments of the present invention, the rectifier tooth includes two tooth lateral surfaces arranged opposite each other along the circumference of the collector, and the tooth lateral surfaces are connected to the tooth tip through a transition surface, which is an arc surface or an inclined plane.

[0015] According to some embodiments of the present invention, a rectifier groove is defined between adjacent rectifier teeth, and the width L2 of the top of the rectifier groove in the circumferential direction of the collector satisfies: 1.4mm≤L2≤2mm.

[0016] According to some embodiments of the present invention, a rectifier groove is defined between adjacent rectifier teeth, and the rectifier groove is U-shaped, V-shaped, trapezoidal, or rectangular.

[0017] According to some embodiments of the present invention, a rectifier groove is defined between adjacent rectifier teeth, and the bottom of the rectifier groove has an arc-shaped profile in the circumferential direction of the collector, and the radius R of the bottom of the groove satisfies: 0.2mm≤R≤1.2mm.

[0018] According to some embodiments of the present invention, the number z of rectifier teeth in a single collector satisfies: 120≤z≤180.

[0019] According to some embodiments of the present invention, the volute body includes a volute main body and an air outlet. The volute main body defines the impeller cavity, and the air outlet defines an air outlet channel communicating with the impeller cavity. The air duct includes the air outlet channel, which is located radially outside the impeller cavity. The volute main body has the air inlet, and the air outlet has the air outlet. The air inlets are formed on both axial sides of the volute main body, and a collector is provided at each air inlet.

[0020] A fan according to a second aspect of the present invention includes: a fan casing as described in a first aspect of the present invention; and a fan wheel housed within the fan wheel cavity.

[0021] According to the embodiments of the present invention, the fan is equipped with the fan volute described in the first aspect of the present invention, and a rectifier tooth structure is provided at the tail of the collector. When the fan with the fan volute is working, the airflow entering from the air inlet is guided to the impeller cavity through the collector. When the airflow flows to the tail of the collector, the rectifier tooth structure located at the tail of the collector can disrupt the periodicity of the vortex, decompose the large vortex into smaller and more dispersed vortices, thereby reducing the noise intensity of the vortex falling off from the tail and reducing the noise generated when the airflow is introduced into the impeller cavity from the air inlet through the collector. Furthermore, by making the thickness of the root of the rectifier tooth in the radial direction of the collector greater than the thickness of the tooth tip in the radial direction of the collector, the risk of stress concentration at the root of the rectifier tooth is reduced, and the root of the rectifier tooth is less likely to break when the airflow generates vortices.

[0022] The heating, ventilation and air conditioning equipment according to a third aspect of the present invention includes: the fan described in the second aspect of the present invention.

[0023] According to the HVAC equipment of the present invention, by setting the fan described in the second aspect embodiment of the present invention, the fan volute of the fan has a rectifier tooth structure set at the tail of the collector. When the fan with the fan volute is working, the airflow entering from the air inlet is guided to the impeller cavity through the collector. When the airflow flows to the tail of the collector, the rectifier tooth structure located at the tail of the collector can disrupt the periodicity of the vortex, decompose the large vortex into smaller and more dispersed vortices, thereby reducing the noise intensity of the vortex falling off the tail and reducing the noise generated when the airflow is introduced into the impeller cavity from the air inlet through the collector. Furthermore, by making the thickness of the root of the rectifier tooth in the radial direction of the collector greater than the thickness of the tooth tip in the radial direction of the collector, the risk of stress concentration at the root of the rectifier tooth is reduced, and the root of the rectifier tooth is less likely to break when the airflow generates vortices.

[0024] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0025] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0026] Figure 1 This is a schematic diagram of a fan volute according to some embodiments of the present invention;

[0027] Figure 2 yes Figure 1 An enlarged schematic diagram of point A in the middle;

[0028] Figure 3 This is a schematic diagram of a rectifier tooth structure according to some embodiments of the utility model;

[0029] Figure 4 yes Figure 1 Schematic diagram of a current collector;

[0030] Figure 5 yes Figure 4 An enlarged diagram of point B in the middle;

[0031] Figure 6 This is a schematic diagram of the rectifier tooth structure of a fan volute according to other embodiments of the utility model;

[0032] Figure 7 This is a schematic diagram of a fan according to some embodiments of the present invention.

[0033] Figure label:

[0034] 100. Fan casing; 11. Air inlet; 12. Air outlet; 13. Air duct; 131. Fan wheel cavity; 132. Air outlet channel;

[0035] 10. Volute body; 14. Volute main body; 15. Air outlet;

[0036] 20. Collector; 21. Main body; 22. Tail end; 23. Rectifier tooth structure; 231. Rectifier tooth; 232. Inner tooth surface; 233. Lateral tooth surface; 234. Tooth tip; 235. Tooth root; 236. Transition surface; 24. Rectifier slot; 241. Slot top; 242. Slot bottom;

[0037] 200. Fan;

[0038] 30. Windmill. Detailed Implementation

[0039] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0040] The following is for reference. Figures 1-7 Description of a fan volute 100 according to an embodiment of the present utility model.

[0041] refer to Figures 1-4 According to the first aspect of the present invention, the fan volute 100 includes: a volute body 10 and a collector 20.

[0042] The volute body 10 has an air inlet 11, an air outlet 12, and an air duct 13. The air duct 13 connects the air inlet 11 and the air outlet 12, and includes a rotor cavity 131 for accommodating the impeller 30. Airflow enters the air duct 13 inside the volute body 10 from the air inlet 11 and exits from the air outlet 12 through the air duct 13. The impeller cavity 131 accommodates the impeller 30. The volute body 10 serves to prevent dust and protect the internal structure. The inner wall of the volute body 10 guides the airflow. The air inlet 11 on the volute body 10 allows airflow to enter the interior of the volute body 10, and the airflow accelerated and pressurized by the impeller 30 is then discharged through the air outlet 12.

[0043] The collector 20 is arranged around the air inlet 11. For example, the central axis c of the collector 20 is coaxial with the central axis of the impeller 30. The collector 20 includes a main body 21 and a tail 22 arranged along the axial direction of the collector 20. The main body 21 is connected to the volute body 10, and the tail 22 is located in the air duct 13 and is connected to the side of the main body 21 near the impeller cavity 131.

[0044] For example, the air inlet 11 can be circular, the cross-section of the collector 20 can be annular, and the cross-section of the collector 20 is perpendicular to the central axis c of the collector 20.

[0045] The axial side of the tail portion 22 near the impeller cavity 131 constitutes the axial side of the collector 20 near the impeller cavity 131. The collector 20 is used to guide and concentrate the airflow, allowing it to enter the impeller cavity 131 of the volute body 10 more smoothly. For example, both the main body portion 21 and the tail portion 22 of the collector 20 guide and concentrate the airflow. When the airflow enters the collector 20, it first flows through the main body portion 21 of the collector 20, then through the tail portion 22 of the collector 20, and finally enters the impeller cavity 131.

[0046] Alternatively, the collector 20 can be integrally formed with the volute body 10.

[0047] The tail portion 22 of the collector 20 is formed with a rectifier tooth structure 23, which includes a plurality of rectifier teeth 231 arranged circumferentially along the tail portion 22.

[0048] For example, multiple rectifier teeth 231 can be evenly arranged circumferentially along the tail 22. Without these rectifier teeth 231 arranged circumferentially along the tail 22, when the airflow flows along the inner wall of the collector 20 to the tail 22 and then falls off and directly enters the impeller, turbulence and pressure pulsations are easily generated, forming vortices and increasing the noise of the airflow. By circumferentially arranging the rectifier tooth structure 23 at the tail 22 of the collector 20, the rectifier tooth structure 23 can disrupt the periodicity of the vortices when the airflow flows to the tail 22 of the collector 20, decomposing large vortices into smaller, more dispersed vortices, thereby reducing the noise intensity of the vortices falling off the tail 22.

[0049] The thickness of the tooth tip 234 of the rectifier tooth 231 in the radial direction of the collector 20 is t1, and the thickness of the tooth root 235 of the rectifier tooth 231 in the radial direction of the collector 20 is t2, where t1 < t2. The thickness t1 of the tooth tip 234 is smaller than the thickness t2 of the tooth root 235, which can reduce the risk of stress concentration at the tooth root 235 of the rectifier tooth 231, enhance the structural strength of the rectifier tooth 231, and make the tooth root 235 of the rectifier tooth 231 less prone to breakage when the airflow generates vortices.

[0050] For example, when the collector 20 is formed by mold, by making the thickness t1 of the tooth tip 234 of the rectifier tooth 231 in the radial direction of the collector 20 smaller than the thickness t2 of the tooth root 235 of the rectifier tooth 231, it is beneficial for the collector 20 to be demolded and the processing and production difficulty of the collector 20 is reduced.

[0051] According to the embodiment of the present invention, the fan volute 100 has a rectifier tooth structure 23 provided at the tail 22 of the collector 20. When the fan 200 with the fan volute 100 is working, the airflow entering from the air inlet 11 is guided to the impeller cavity 131 by the collector 20. When the airflow reaches the tail 22 of the collector 20, the rectifier tooth structure 23 at the tail 22 of the collector 20 can disrupt the periodicity of the vortex, decomposing the large vortex into smaller and more dispersed vortices, thereby reducing the vortex. The noise intensity of the detached part 22 is reduced, which reduces the noise generated when the airflow is introduced from the air inlet 11 through the collector 20 into the impeller cavity 131. Furthermore, by making the thickness of the tooth root 235 of the rectifier tooth 231 in the radial direction of the collector 20 greater than the thickness of the tooth tip 234 of the rectifier tooth 231 in the radial direction of the collector 20, the risk of stress concentration at the tooth root 235 of the rectifier tooth 231 is reduced, and the tooth root 235 of the rectifier tooth 231 is less likely to break when the airflow generates vortices.

[0052] refer to Figures 4-5 According to some embodiments of this utility model, 0.4 ≤ t1 / t2 ≤ 0.8. For example, the ratio of the thickness t1 of the tooth tip 234 of the rectifier tooth 231 in the radial direction of the collector 20 to the thickness t2 of the tooth root 235 of the rectifier tooth 231 in the radial direction of the collector 20 can be 0.4, 0.45, 0.5, 0.55, 0.6, 0.65, 0.7, 0.75, 0.8, etc.

[0053] If the ratio of t1 to t2 is too small, the thickness of the tooth tip 234 of the rectifier tooth 231 in the radial direction of the collector 20 will be too thin, which will reduce the structural strength of the rectifier tooth 231 and make it more susceptible to impact damage when the airflow generates vortices. If the ratio of t1 to t2 is too large, it will increase the risk of stress concentration at the tooth root 235 of the rectifier tooth 231, making the tooth root 235 more prone to fracture. By ensuring that 0.4≤t1 / t2≤0.8, the overall structural strength of the rectifier tooth structure 23 can be enhanced, thereby improving the service life of the rectifier tooth structure 23.

[0054] Optionally, t1 / t2 = 0.61. By making the ratio of the thickness t1 of the tooth tip 234 of the rectifier tooth 231 in the radial direction of the collector 20 to the thickness t2 of the tooth root 235 of the rectifier tooth 231 in the radial direction of the collector 20 0.61, it is possible to better ensure the structural strength of the rectifier tooth 231 while facilitating the processing of the rectifier tooth 231, thereby reducing the production difficulty and manufacturing cost of the collector 20.

[0055] refer to Figures 4-5According to some embodiments of the present invention, the surface of the rectifier tooth 231 includes an inner tooth surface 232, which extends obliquely toward the direction away from the central axis c of the collector 20 in a direction along the axial direction of the collector 20 and close to the impeller cavity 131.

[0056] For example, when the airflow passes through the tail 22 of the collector 20, if the inner surface 232 of the tooth extends inclined towards the direction close to the central axis c of the collector 20 or extends parallel to the central axis c of the collector 20, then when the airflow enters the impeller 30 located in the impeller cavity 131 from the tail 22 of the collector 20, the airflow direction needs to change by a large angle so that the airflow flows out radially from the impeller 30, thereby increasing the degree of airflow turbulence, and thus easily generating turbulence and separation vortices on the inner wall of the tail 22. By extending the inner surface 232 of the teeth at an angle away from the central axis c of the collector 20 along the axial direction of the collector 20 and close to the impeller cavity 131, the inner surface 232 of the teeth can buffer and guide the airflow when it passes through the tail 22 of the collector 20, guiding the airflow to the impeller 30 more evenly. This allows the airflow to enter the impeller 30 more evenly and smoothly, reducing turbulence and separation vortices generated on the inner wall of the tail 22, thereby reducing the noise generated when the airflow flows through the fan casing 100.

[0057] refer to Figures 2-3 According to some embodiments of the present invention, the tooth length h of the rectifier tooth 231 satisfies: 1.2mm≤h≤1.8mm.

[0058] The tooth length of the rectifier tooth 231 is the length of the rectifier tooth 231 in the axial direction of the collector 20.

[0059] For example, the tooth length h of the rectifier tooth 231 can be 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, etc.

[0060] If the tooth length of the rectifier tooth 231 is too long, its structural strength will be reduced, making it more susceptible to damage from impacts when airflow generates vortices. If the tooth length of the rectifier tooth 231 is too short, the rectifier tooth structure 23 will not be able to effectively disrupt the vortices when the airflow reaches the tail 22 of the collector 20. By ensuring that the tooth length h of the rectifier tooth 231 satisfies 1.2mm≤h≤1.8mm, the rectifier tooth structure 23 can disrupt larger vortices while maintaining the structural strength of the rectifier tooth 231, breaking down large vortices into smaller, more dispersed vortices, thereby reducing the noise intensity of vortices falling off the tail 22.

[0061] Optionally, the tooth length h of the rectifier tooth 231 is 1.65 mm. By making the tooth length h of the rectifier tooth 231 1.65 mm, the structural strength of the rectifier tooth 231 can be better guaranteed, while the rectifier tooth structure 23 can disrupt large eddies, decompose large eddies into smaller and more dispersed eddies, thereby reducing the noise intensity of eddies falling off from the tail 22.

[0062] refer to Figures 2-3 According to some embodiments of this utility model, the width L1 of the tooth tip 234 of the rectifier tooth 231 in the circumferential direction of the collector 20 satisfies: 1.2mm≤L1≤1.6mm. For example, the width L1 of the tooth tip 234 of the rectifier tooth 231 in the circumferential direction of the collector 20 can be 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, etc.

[0063] If the width of the tooth tip 234 of the rectifier tooth 231 in the circumferential direction of the collector 20 is too short, the structural strength of the rectifier tooth 231 will be reduced, making it more susceptible to damage from impact when vortices are generated in the airflow. If the width of the tooth tip 234 of the rectifier tooth 231 in the circumferential direction of the collector 20 is too long, the spatial proportion of a single rectifier tooth 231 will increase, resulting in too few rectifier teeth 231 in the overall rectifier tooth structure 23, which cannot fully disperse the vortices in the airflow. By ensuring that the width L1 of the tooth tip 234 of the rectifier tooth 231 in the circumferential direction of the collector 20 satisfies 1.2mm≤L1≤1.6mm, the structural strength of the rectifier tooth 231 can be guaranteed while fully dispersing the vortices in the airflow.

[0064] Optionally, L1 = 1.32 mm. By making the width L1 of the tooth tip 234 of the rectifier tooth 231 in the circumferential direction of the collector 20 1.32 mm, the structural strength of the rectifier tooth 231 can be better guaranteed while fully dispersing the eddies in the airflow.

[0065] refer to Figures 2-3 According to some embodiments of the present invention, the tooth length h of the rectifier tooth 231 satisfies: 1.2mm≤h≤1.8mm, and the width L1 of the tooth tip 234 of the rectifier tooth 231 in the circumferential direction of the collector 20 satisfies: 1.2mm≤L1≤1.6mm.

[0066] If the tooth length h of the rectifier tooth 231 is too short and the width L1 of the tooth tip 234 in the circumferential direction of the collector 20 is too long, it cannot effectively disperse the eddies in the airflow. If the tooth length h of the rectifier tooth 231 is too long and the width L1 of the tooth tip 234 in the circumferential direction of the collector 20 is too short, the structural strength of the rectifier tooth 231 is low, making it prone to breakage. By ensuring that the tooth length h of the rectifier tooth 231 satisfies 1.2mm≤h≤1.8mm and the width L1 of the tooth tip 234 in the circumferential direction of the collector 20 satisfies 1.2mm≤L1≤1.6mm, the structural strength of the rectifier tooth 231 can be guaranteed while effectively dispersing the eddies in the airflow.

[0067] refer to Figures 2-3 According to some embodiments of the present invention, the rectifier tooth 231 includes two tooth surfaces 233 arranged opposite to each other along the circumference of the collector 20, and the included angle θ between the tooth surfaces 233 and the tooth tip 234 of the rectifier tooth 231 satisfies: 96°≤θ≤108°.

[0068] For example, the angle θ between the tooth flank 233 and the tooth tip 234 of the rectifier tooth 231 can be 96°, 97°, 98°, 99°, 100°, 101°, 102°, 103°, 104°, 105°, 106°, 107°, 108°, etc.

[0069] If the angle θ between the tooth flank 233 and the tooth tip 234 of the rectifier tooth 231 is too small, it will easily increase the risk of stress concentration at the tooth root 235 of the rectifier tooth 231. When the airflow generates vortices, the tooth root 235 of the rectifier tooth 231 is prone to breakage. If the angle θ between the tooth flank 233 and the tooth tip 234 of the rectifier tooth 231 is too large, it will increase the spatial proportion of a single rectifier tooth 231, resulting in too few rectifier teeth 231 in the overall rectifier tooth structure 23, which cannot fully play the role of dispersing vortices in the airflow. By ensuring that the angle θ between the tooth flank 233 and the tooth tip 234 of the rectifier tooth 231 satisfies 96°≤θ≤108°, the structural strength of the rectifier tooth 231 can be guaranteed while fully dispersing vortices in the airflow.

[0070] Optionally, θ = 104°. By making the angle θ = 104° between the tooth flank 233 and the tooth tip 234 of the rectifier tooth 231, the structural strength of the rectifier tooth 231 can be better guaranteed while fully dispersing the vortices in the airflow.

[0071] refer to Figures 2-3 According to some embodiments of the present invention, the included angle θ between the tooth side surface 233 and the tooth tip 234 of the collector 20 satisfies: 96°≤θ≤108° and the tooth length h of the rectifier tooth 231 satisfies: 1.2mm≤h≤1.8mm.

[0072] If the angle θ between the tooth flank 233 and the tooth tip 234 of the rectifier tooth 231 is too small and the tooth length h of the rectifier tooth 231 is too long, the risk of stress concentration at the tooth root 235 of the rectifier tooth 231 will easily increase. When the airflow generates vortices, the tooth root 235 of the rectifier tooth 231 is prone to breakage. If the angle θ between the tooth flank 233 and the tooth tip 234 of the rectifier tooth 231 is too large and the tooth length h of the rectifier tooth 231 is too short, it will not be able to effectively disperse the vortices in the airflow. By ensuring that the angle θ between the tooth flank 233 and the tooth tip 234 of the rectifier tooth 231 satisfies: 96°≤θ≤108° and the tooth length h of the rectifier tooth 231 satisfies: 1.2mm≤h≤1.8mm, the structural strength of the rectifier tooth 231 can be guaranteed while effectively dispersing the vortices in the airflow.

[0073] refer to Figures 2-3 According to some embodiments of the present invention, the included angle θ between the tooth side surface 233 and the tooth tip 234 of the rectifier tooth 231 satisfies: 96°≤θ≤108° and the width L1 of the tooth tip 234 of the rectifier tooth 231 in the circumferential direction of the collector 20 satisfies: 1.2mm≤L1≤1.6mm.

[0074] If the angle θ between the tooth flank 233 and the tooth tip 234 of the collector 20 is too small and the width L1 of the tooth tip 234 of the rectifier tooth 231 in the circumferential direction of the rectifier tooth 231 is too short, it will easily increase the risk of stress concentration at the tooth root 235 of the rectifier tooth 231. When the airflow generates vortices, the tooth root 235 of the rectifier tooth 231 is prone to breakage. If the angle θ between the tooth flank 233 and the tooth tip 234 of the collector 20 is too large and the width L1 of the tooth tip 234 of the rectifier tooth 231 in the circumferential direction of the collector 20 is too long, it will not be able to fully play the role of dispersing vortices in the airflow. By ensuring that the angle θ between the tooth side surface 233 and the tooth tip 234 of the rectifier tooth 231 satisfies: 96°≤θ≤108°, and that the width L1 of the tooth tip 234 of the rectifier tooth 231 in the circumferential direction of the collector 20 satisfies: 1.2mm≤L1≤1.6mm, the rectifier tooth 231 can be guaranteed in its structural strength while effectively dispersing the eddies in the airflow.

[0075] refer to Figures 2-3 According to some embodiments of the present invention, the tooth tip 234 is a flat surface, an arc surface, or a sharp angle. By making the tooth tip 234 of the rectifier tooth 231 a flat surface, it is easier to process the rectifier tooth structure 23; by making the tooth tip 234 of the rectifier tooth 231 an arc surface, the structural strength of the rectifier tooth structure 23 can be increased, preventing the part of the rectifier tooth structure 23 near the tooth tip 234 from breaking; by making the tooth tip 234 of the rectifier tooth 231 a sharp angle, the vortex can be guided, and the vortex in the airflow can be dispersed more fully.

[0076] refer to Figure 6According to some embodiments of the present invention, the rectifier tooth 231 includes two tooth surfaces 233 arranged opposite to each other along the circumference of the collector 20. The tooth surfaces 233 and the tooth tips 234 are connected by a transition surface 236, which is an arc surface or a sloping plane.

[0077] For example, the transition surface 236 can be a circular arc surface or a sloping plane. By connecting the tooth lateral surface 233 and the tooth tip 234 through the transition surface 236, the stress concentration at the connection between the tooth lateral surface 233 and the tooth tip 234 can be reduced. When the airflow generates vortices, the rectifier tooth structure 23 is less likely to be damaged, thereby improving the service life of the rectifier tooth structure 23.

[0078] refer to Figures 2-3 According to some embodiments of the present invention, a rectifier groove 24 is defined between adjacent rectifier teeth 231, and the width L2 of the top 241 of the rectifier groove 24 in the circumferential direction of the collector 20 satisfies: 1.4mm≤L2≤2mm.

[0079] For example, the width L2 of the top 241 of the rectifier 24 in the circumferential direction of the collector 20 can be 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2mm, etc.

[0080] If the width of the top 241 of the rectifier slot 24 in the circumferential direction of the collector 20 is too short, the spacing between adjacent rectifier teeth 231 will be small, resulting in an excessively high density of rectifier teeth 231 and affecting the processing difficulty of the rectifier tooth structure 23. If the width of the top 241 of the rectifier slot 24 in the circumferential direction of the collector 20 is too long, the spacing between adjacent rectifier teeth 231 will be too large, failing to adequately guide the airflow and disperse the eddies in the airflow. By ensuring that the width L2 of the top 241 of the rectifier slot 24 in the circumferential direction of the collector 20 satisfies 1.4mm≤L2≤2mm, it is possible to guide the airflow and disperse the eddies in the airflow while reducing the processing difficulty of the rectifier tooth structure 23.

[0081] Optionally, L2 = 1.6 mm. By making the width L2 of the groove top 241 of the rectifier tooth 231 in the circumferential direction of the collector 20 1.6 mm, it is possible to better disperse the vortices in the airflow while facilitating the machining of the rectifier tooth 231.

[0082] refer to Figures 2-3 According to some embodiments of the present invention, a rectifier groove 24 is defined between adjacent rectifier teeth 231. The width L2 of the top 241 of the rectifier groove 24 in the circumferential direction of the collector 20 satisfies: 1.4mm≤L2≤2mm and the tooth length h of the rectifier teeth 231 satisfies: 1.2mm≤h≤1.8mm.

[0083] If the width L2 of the top 241 of the rectifier 24 in the circumferential direction of the collector 20 is too small and the tooth length h of the rectifier tooth 231 is too long, the arrangement density of the rectifier tooth 231 will be too high, and the long tooth length h will make it difficult to process, further increasing the difficulty of processing and forming the rectifier tooth structure 23. If the width L2 of the top 241 of the rectifier 24 in the circumferential direction of the collector 20 is too large and the tooth length h of the rectifier tooth 231 is too short, it will not be able to fully disperse the eddies in the airflow. By ensuring that the width L2 of the top 241 of the rectifier 24 in the circumferential direction of the collector 20 satisfies: 1.4mm≤L2≤2mm and the tooth length h of the rectifier tooth 231 satisfies: 1.2mm≤h≤1.8mm, it is possible to better disperse the eddies in the airflow while facilitating the processing of the rectifier tooth 231.

[0084] refer to Figures 2-3 According to some embodiments of the present invention, a rectifier groove 24 is defined between adjacent rectifier teeth 231. The width L2 of the groove top 241 of the rectifier groove 24 in the circumferential direction of the collector 20 satisfies: 1.4mm≤L2≤2mm, and the width L1 of the tooth top 234 of the rectifier tooth 231 in the circumferential direction of the collector 20 satisfies: 1.2mm≤L1≤1.6mm.

[0085] If the width L2 of the top 241 of the rectifier 24 in the circumferential direction of the collector 20 is too small and the width L1 of the tooth tip 234 of the rectifier 231 in the circumferential direction of the collector 20 is too small, then the arrangement of the rectifier teeth 231 in the circumferential direction of the collector is too dense, further increasing the difficulty of processing and forming the rectifier tooth structure 23; if the width L2 of the top 241 of the rectifier 24 in the circumferential direction of the collector 20 is too large and the width L1 of the tooth tip 234 of the rectifier 231 in the circumferential direction of the collector 20 is too large, then the arrangement of the rectifier teeth 231 in the circumferential direction of the collector is too sparse, and cannot fully play the role of dispersing the eddies in the airflow. By ensuring that the width L2 of the top 241 of the rectifier slot 24 in the circumferential direction of the collector 20 satisfies: 1.4mm≤L2≤2mm, and the width L1 of the tooth top 234 of the rectifier tooth 231 in the circumferential direction of the collector 20 satisfies: 1.2mm≤L1≤1.6mm, the rectifier tooth 231 is appropriately arranged in the circumferential direction of the collector 20, which can better disperse the vortices in the airflow and facilitate the processing of the rectifier tooth 231.

[0086] refer to Figures 2-3 According to some embodiments of the present invention, a rectifier groove 24 is defined between adjacent rectifier teeth 231. The width L2 of the groove top 241 of the rectifier groove 24 in the circumferential direction of the collector 20 satisfies: 1.4mm≤L2≤2mm and the included angle θ between the tooth side surface 233 and the tooth top 234 of the rectifier tooth 231 satisfies: 96°≤θ≤108°.

[0087] If the width L2 of the top 241 of the rectifier 24 in the circumferential direction of the collector 20 is too small and the angle θ between the tooth side 233 and the tooth tip 234 of the collector 20 is too small, then the rectifier teeth 231 are arranged too densely in the circumferential direction of the collector, further increasing the difficulty of processing and forming the rectifier tooth structure 23; if the width L2 of the top 241 of the rectifier 24 in the circumferential direction of the collector 20 is too large and the angle θ between the tooth side 233 and the tooth tip 234 of the rectifier teeth 231 is too large, then the rectifier teeth 231 are arranged too sparsely in the circumferential direction of the collector, and cannot fully play the role of dispersing the eddies in the airflow. By ensuring that the width L2 of the top 241 of the rectifier slot 24 in the circumferential direction of the collector 20 satisfies: 1.4mm≤L2≤2mm and the angle θ between the tooth side surface 233 and the rectifier tooth 231 of the collector 20 satisfies: 96°≤θ≤108°, the rectifier tooth 231 is appropriately arranged in the circumferential direction of the collector 20, which can better disperse the vortices in the airflow and facilitate the processing of the rectifier tooth 231.

[0088] refer to Figures 2-3 According to some embodiments of this utility model, a rectifier groove 24 is defined between adjacent rectifier teeth 231, and the rectifier groove 24 is U-shaped, V-shaped, trapezoidal, or rectangular. By making the rectifier groove 24 U-shaped, the tooth side surface 233 of the rectifier teeth 231 can have a certain curvature, which is beneficial to enhancing the structural strength of the rectifier teeth 231; by making the rectifier groove 24 V-shaped, the distance between the tooth roots 233 of two adjacent rectifier teeth 231 can be closer, making the arrangement of the rectifier teeth 231 more compact, which is beneficial to enhancing the structural strength of the rectifier teeth 231; by making the rectifier groove 24 trapezoidal, the distance between the tooth roots 233 of two adjacent rectifier teeth 231 can be farther, making the processing and forming difficulty of the rectifier tooth structure 23 lower; by making the rectifier groove 24 rectangular, the tooth side surface 233 of the rectifier tooth structure 23 can all be parallel to the axial direction of the collector 20, making the processing and forming difficulty of the rectifier tooth structure 23 lower.

[0089] refer to Figures 2-3 According to some embodiments of the present invention, a rectifier groove 24 is defined between adjacent rectifier teeth 231. The bottom 242 of the rectifier groove 24 has an arc-shaped profile in the circumferential direction of the collector 20. By making the bottom 242 of the rectifier groove 24 have an arc-shaped profile in the circumferential direction of the collector 20, it is beneficial to disperse eddies in the airflow.

[0090] Furthermore, the radius R of the bottom of the groove 242 satisfies: 0.2mm≤R≤1.2mm.

[0091] For example, the radius R of the bottom of the groove 242 can be 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1.0mm, 1.1mm, 1.2mm, etc.

[0092] If the radius of the bottom 242 of the rectifier groove 24 is too small, the spacing between two adjacent rectifier teeth 231 will be too small, resulting in an excessively high density of rectifier teeth 231 and affecting the processing difficulty of the rectifier tooth structure 23. If the radius of the bottom 242 of the rectifier groove 24 is too large, the spacing between adjacent rectifier teeth 231 will be too large, failing to adequately guide the airflow and disperse the eddies in the airflow. By ensuring that the radius R of the bottom 242 satisfies 0.2mm≤R≤1.2mm, the eddies in the airflow can be dispersed while reducing the processing difficulty of the rectifier tooth structure 23.

[0093] Optionally, R = 0.4 mm. By setting the radius R of the bottom 242 of the rectifier groove 24 to 0.4 mm, it is possible to better disperse vortices in the airflow while making the machining and forming difficulty of the rectifier tooth structure 23 lower.

[0094] refer to Figures 2-3 According to some embodiments of the present invention, a rectifier groove 24 is defined between adjacent rectifier teeth 231, the radius R of the groove bottom 242 satisfies: 0.2mm≤R≤1.2mm, and the width L2 of the groove top 241 of the rectifier groove 24 in the circumferential direction of the collector 20 satisfies: 1.4mm≤L2≤2mm.

[0095] If the radius R of the bottom 242 of the rectifier 24 is too small and the width L2 of the top 241 of the rectifier 24 in the circumferential direction of the collector 20 is too small, the rectifier teeth 231 will be too densely arranged in the circumferential direction of the collector, further increasing the difficulty of processing and forming the rectifier tooth structure 23; if the radius R of the bottom 242 of the rectifier 24 is too large and the width L2 of the top 241 of the rectifier 24 in the circumferential direction of the collector 20 is too large, the rectifier teeth 231 will be too sparsely arranged in the circumferential direction of the collector, and will not be able to fully play the role of dispersing the eddies in the airflow. By ensuring that the radius R of the bottom 242 of the rectifier 24 satisfies: 0.2mm≤R≤1.2mm and the width L2 of the top 241 of the rectifier 24 in the circumferential direction of the collector 20 satisfies: 1.4mm≤L2≤2mm, the rectifier teeth 231 are arranged appropriately in the circumferential direction of the collector 20, which can better disperse the vortices in the airflow and facilitate the processing of the rectifier teeth 231.

[0096] refer to Figures 2-3According to some embodiments of the present invention, a rectifier groove 24 is defined between adjacent rectifier teeth 231, the radius R of the groove bottom 242 satisfies: 0.2mm≤R≤1.2mm, and the angle θ between the tooth side surface 233 and the tooth tip 234 of the rectifier tooth 231 satisfies: 96°≤θ≤108°.

[0097] If the radius R of the bottom 242 of the rectifier 24 is too small and the angle θ between the tooth side 233 and the tooth tip 234 of the rectifier tooth 231 is too small, the rectifier tooth 231 will be too densely arranged in the circumferential direction of the collector, further increasing the difficulty of processing and forming the rectifier tooth structure 23; if the radius R of the bottom 242 of the rectifier 24 is too large and the angle θ between the tooth side 233 and the tooth tip 234 of the collector 20 is too large, the rectifier tooth 231 will be too sparsely arranged in the circumferential direction of the collector, and will not be able to fully play the role of dispersing the eddies in the airflow. By ensuring that the radius R of the groove bottom 242 satisfies: 0.2mm≤R≤1.2mm and the angle θ between the tooth side surface 233 and the tooth tip 234 of the rectifier tooth 231 satisfies: 96°≤θ≤108°, the rectifier tooth 231 is appropriately arranged in the circumferential direction of the collector 20, which can better disperse the vortices in the airflow and facilitate the processing of the rectifier tooth 231.

[0098] According to some embodiments of the present invention, the number z of rectifier teeth 231 in a single collector 20 satisfies: 120≤z≤180.

[0099] For example, the number z of rectifier teeth 231 in a single collector 20 can be 120, 125, 130, 135, 140, 145, 150, 155, 160, 165, 170, 175, 180, etc.

[0100] If the number of rectifier teeth 231 in a single collector 20 is too large, it increases the manufacturing difficulty of the collector 20; if the number of rectifier teeth 231 in a single collector 20 is too small, it cannot fully disperse the eddies in the airflow. By setting the number of rectifier teeth 231 z in a single collector 20 to 120≤z≤180, it is possible to disperse the eddies in the airflow while facilitating the manufacturing of the collector 20.

[0101] Optionally, the number z of rectifier teeth 231 in a single collector 20 can be an odd number.

[0102] For example, the number z of rectifier teeth 231 in a single collector 20 can be 123, 129, 133, 139, 143, 149, 153, 159, 163, 169, 173, 179, etc. By making the number of rectifier teeth 231 in a single collector 20 odd, when the rectifier teeth 231 are evenly distributed around the tail 22 of the collector 20, the projections of any two rectifier teeth 231 at the tail 22 of the collector 20 in the radial direction of the collector 20 can be staggered. This prevents airflows of the same frequency from flowing in opposite directions on the same straight line when passing through the gaps in the rectifier teeth 231, thus reducing noise by reducing airflow fluctuations.

[0103] Optionally, z = 149. By making the number of rectifier teeth 231 in a single collector 20 z 149, it is possible to better disperse eddies in the airflow, prevent the generation of resonance of the airflow at the same frequency, and facilitate the processing of the collector 20.

[0104] refer to Figure 1 According to some embodiments of the present invention, the volute body 10 includes a volute main body 14 and an air outlet 15. The volute main body 14 defines an air impeller cavity 131, and the air outlet 15 defines an air outlet channel 132 communicating with the air impeller cavity 131. The air duct 13 includes the air outlet channel 132, which is located radially outside the air impeller cavity 131. The volute main body 14 has an air inlet 11, and the air outlet 15 has an air outlet 12. Airflow enters the volute main body 14 from the air inlet 11 through the air duct 13, circulates in the air impeller cavity 131, and is then discharged from the air outlet 15 through the air outlet channel 132. The air outlet 15 is used to discharge the air flowing through the volute main body 14.

[0105] Air inlets 11 are formed on both axial sides of the volute body 14, and a collector 20 is provided at each air inlet 11. By forming air inlets 11 and collectors 20 on both axial sides of the volute body 14, air can be simultaneously introduced into the impeller cavity 131 through the collectors 20 on both sides. With airflow on both sides of the impeller 30, the axial force on the impeller 30 can be more even, reducing wear and noise during operation of the impeller 30. It also makes the airflow distribution in the impeller cavity 131 more uniform, reducing energy consumption and increasing air volume output.

[0106] refer to Figure 7 The fan 200 according to the second aspect of the present invention includes: a fan volute 100 and a fan wheel 30 according to the first aspect of the present invention, wherein the fan wheel 30 is accommodated in a fan wheel cavity 131.

[0107] For example, fan 200 can be a centrifugal fan 200.

[0108] According to the embodiment of the present invention, the fan 200, by providing the fan casing 100 of the first aspect of the present invention, has a rectifier tooth structure 23 circumferentially arranged at the tail 22 of the collector 20. When the fan 200 with the fan casing 100 is working, the airflow entering from the air inlet 11 is guided to the impeller cavity 131 through the collector 20. When the airflow flows to the tail 22 of the collector 20, the rectifier tooth structure 23 located at the tail 22 of the collector 20 can disrupt the periodicity of the vortex, decomposing the large vortex into smaller, more... The dispersed vortices reduce the noise intensity of vortices falling off the tail 22, thus reducing the noise generated when the airflow is introduced from the inlet 11 through the collector 20 into the impeller cavity 131. Furthermore, by making the thickness of the tooth root 235 of the rectifier tooth 231 in the radial direction of the collector 20 greater than the thickness of the tooth tip 234 of the rectifier tooth 231 in the radial direction of the collector 20, the risk of stress concentration at the tooth root 235 of the rectifier tooth 231 is reduced, and the tooth root 235 of the rectifier tooth 231 is less likely to break when the airflow generates vortices.

[0109] The heating, ventilation and air conditioning equipment according to a third aspect of the present invention includes: a fan 200 according to a second aspect of the present invention.

[0110] For example, HVAC equipment can be air conditioning systems, heat pump systems, etc. HVAC equipment can include indoor units and outdoor units. The aforementioned fan 200 can be used in the indoor unit, and the aforementioned fan 200 can serve as the air supply fan 200 for the indoor unit. For example, the indoor unit can be a ducted air conditioner.

[0111] According to the HVAC equipment of the present invention, by providing a fan 200 as described in the second aspect of the present invention, the fan volute 100 of the fan 200 has a circumferentially arranged rectifying tooth structure 23 at the tail 22 of the collector 20. When the fan 200 with the fan volute 100 is working, the airflow entering from the air inlet 11 is guided to the impeller cavity 131 through the collector 20. When the airflow flows to the tail 22 of the collector 20, the rectifying tooth structure 23 located at the tail 22 of the collector 20 can disrupt the periodicity of the vortex, causing the large vortex to decompose. To create smaller, more dispersed vortices, thereby reducing the noise intensity of vortices falling off the tail 22, the noise generated when airflow is introduced from the inlet 11 through the collector 20 into the impeller cavity 131 is reduced; furthermore, by making the thickness of the tooth root 235 of the rectifier tooth 231 in the radial direction of the collector 20 greater than the thickness of the tooth tip 234 of the rectifier tooth 231 in the radial direction of the collector 20, the risk of stress concentration at the tooth root 235 of the rectifier tooth 231 is reduced, and the tooth root 235 of the rectifier tooth 231 is less likely to break when the airflow generates vortices.

[0112] The following is for reference. Figures 1-7 A fan 200 according to some embodiments of the present invention is described.

[0113] In this embodiment, reference Figures 1-7 The fan 200 includes a fan casing 100 and a fan wheel 30. The fan casing 100 includes a casing body 10 and a collector 20.

[0114] The volute body 10 includes a volute main body 14, an air outlet 15, an air inlet 11, an air outlet 12, and an air duct 13. The air duct 13 connects the air inlet 11 and the air outlet 12 and includes an air impeller cavity 131 for accommodating the impeller 30. The volute main body 14 defines the air impeller cavity 131, and the air outlet 15 defines an air outlet channel 132 that communicates with the impeller cavity 131. The air duct 13 includes the air outlet channel 132, which is located radially outside the impeller cavity 131. The volute main body 14 has an air inlet 11, and the air outlet 15 has an air outlet 12. Air inlets 11 are formed on both axial sides of the volute main body 14, and a collector 20 is provided at each air inlet 11.

[0115] The collector 20 is arranged around the air inlet 11. The collector 20 includes a main body 21 and a tail 22 arranged along the axial direction of the collector 20. The main body 21 is connected to the volute body 10, and the tail 22 is located in the air duct 13 and connected to the side of the main body 21 near the impeller cavity 131.

[0116] The tail portion 22 of the collector 20 is formed with a rectifier tooth structure 23, which includes a plurality of rectifier teeth 231 arranged circumferentially along the tail portion 22, and the number of rectifier teeth 231 is z = 149. The tooth tip 234 of the rectifier tooth 231 is flat, and the width of the tooth tip 234 in the circumferential direction of the collector 20 is L1 = 1.32 mm. A rectifier groove 24 is defined between adjacent rectifier teeth 231. The bottom 242 of the rectifier groove 24 has an arc-shaped profile in the circumferential direction of the collector 20. The width of the top 241 of the rectifier groove 24 in the circumferential direction of the collector 20 is L2 = 1.6 mm, and the radius of the bottom 242 is R = 0.4 mm. The tooth length of the rectifier tooth 231 is h = 1.65 mm. The thickness of the tooth tip 234 of the rectifier tooth 231 in the radial direction of the collector 20 is t1, and the thickness of the tooth root 235 of the rectifier tooth 231 in the radial direction of the collector 20 is t2. 0.4 ≤ t1 / t2 ≤ 0.8.

[0117] The surface of the rectifier tooth 231 includes an inner tooth surface 232 and two circumferentially opposite tooth surfaces 233. In the direction along the axial direction of the collector 20 and close to the impeller cavity 131, the inner tooth surface 232 extends obliquely in the direction away from the central axis c of the collector 20. The tooth surfaces 233 and the tooth tip 234 are connected by a transition surface 236, which is an arc surface. The angle θ between the tooth surfaces 233 and the tooth tip 234 of the rectifier tooth 231 is 104°.

[0118] When the fan 200 is working, the airflow enters the collector 20 from the air inlets 11 on both sides of the fan casing 100. After flowing through the main body 21 and tail 22 of the collector 20, the periodicity of the vortices in the airflow is disrupted by the rectifier teeth 231, breaking down the large vortices in the airflow into more dispersed vortices. The airflow then enters the impeller cavity 131 in the casing body 10. Under the rotation of the impeller 30, the airflow flows along the inner wall of the casing, and then flows from the air duct 13 to the outlet section under the guidance of the volute tongue. As the airflow flows through the outlet section, the cross-section of the outlet section gradually increases, causing the airflow velocity to gradually decrease. Part of the kinetic energy of the airflow is converted into static pressure energy, and the airflow is finally discharged from the outlet 12 with a higher static pressure.

[0119] Through comparative experiments, the noise generated by the fan 200 of this utility model embodiment can be reduced by 1.1 dB compared with that of a conventional fan 200 (a fan 200 without a rectifier tooth structure 23 at the tail 22) under the same air intake conditions.

[0120] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0121] In the description of this utility model, "first feature" and "second feature" may include one or more of the features.

[0122] In the description of this utility model, "multiple" means two or more.

[0123] In the description of this utility model, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or it may include the first and second features not being in direct contact but being in contact through another feature between them.

[0124] In the description of this utility model, the terms "above", "over" and "on top" for the first feature and the second feature include the first feature being directly above or diagonally above the second feature, or simply indicate that the first feature is at a higher horizontal level than the second feature.

[0125] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0126] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A fan casing, characterized in that, include: The volute body has an air inlet, an air outlet, and an air duct. The air duct connects the air inlet and the air outlet and includes a wind turbine cavity for accommodating the wind turbine. A collector is provided, which surrounds the air inlet. The collector includes a main body and a tail section arranged along the axial direction of the collector. The main body is connected to the volute body. The tail section is located in the air duct and connected to the side of the main body near the impeller cavity. The tail section has a rectifier tooth structure, which includes a plurality of rectifier teeth arranged circumferentially along the tail section. The thickness of the tooth tip of the rectifier tooth in the radial direction of the collector is t1, and the thickness of the tooth root of the rectifier tooth in the radial direction of the collector is t2, where t1 < t2.

2. The fan casing according to claim 1, characterized in that, 0.4≤t1 / t2≤0.

8.

3. The fan casing according to claim 1, characterized in that, The surface of the rectifier tooth includes an inner tooth surface that extends obliquely toward the direction away from the central axis of the collector in a direction along the axial direction of the collector and close to the impeller cavity.

4. The fan casing according to claim 1, characterized in that, The tooth length h of the rectifier tooth satisfies: 1.2mm≤h≤1.8mm.

5. The fan casing according to claim 1, characterized in that, The width L1 of the tooth tip of the rectifier tooth in the circumferential direction of the collector satisfies: 1.2mm≤L1≤1.6mm.

6. The fan casing according to any one of claims 1-5, characterized in that, The rectifier tooth includes two tooth lateral faces arranged opposite each other along the circumference of the collector, and the included angle θ between the tooth lateral face and the tooth tip of the rectifier tooth satisfies: 96°≤θ≤108°.

7. The fan casing according to any one of claims 1-5, characterized in that, The tooth tip is a plane, an arc surface, or a sharp angle; and / or, the rectifier tooth includes two tooth lateral surfaces arranged opposite each other along the circumference of the collector, the tooth lateral surfaces and the tooth tip are connected by a transition surface, the transition surface being an arc surface or an inclined plane.

8. The fan casing according to any one of claims 1-5, characterized in that, A rectifier slot is defined between adjacent rectifier teeth, and the width L2 of the top of the rectifier slot in the circumferential direction of the collector satisfies: 1.4mm≤L2≤2mm.

9. The fan casing according to any one of claims 1-5, characterized in that, A rectifier groove is defined between adjacent rectifier teeth, and the rectifier groove is U-shaped, V-shaped, trapezoidal, or rectangular; Alternatively, the bottom of the rectifier slot has an arc-shaped profile in the circumferential direction of the collector, and the radius R of the bottom of the slot satisfies: 0.2mm≤R≤1.2mm.

10. The fan casing according to any one of claims 1-5, characterized in that, The number z of rectifier teeth in a single collector satisfies: 120 ≤ z ≤ 180.

11. The fan casing according to any one of claims 1-5, characterized in that, The volute body includes a volute main body and an air outlet. The volute main body defines the impeller cavity, and the air outlet defines an air outlet channel communicating with the impeller cavity. The air outlet channel is located radially outside the impeller cavity. The volute main body has the air inlet, and the air outlet has the air outlet. The air inlets are formed on both axial sides of the volute main body, and a collector is provided at each air inlet.

12. A fan, characterized in that, include: The fan casing according to any one of claims 1-11; The wind turbine is housed within the wind turbine cavity.

13. A heating, ventilation, and air conditioning (HVAC) device, characterized in that, include: The fan according to claim 12.

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