A type of fan

Abstract

This utility model relates to the field of home appliance technology, specifically to a fan. It includes a volute with an outlet; the volute includes a volute tongue disposed at the edge of the outlet; fan blades that rotate within the volute to generate airflow; a drive component for driving the fan blades to rotate; a flange for connecting the outlet of the volute; and an air guide component disposed between the volute tongue and the flange, used to evenly distribute the airflow at the outlet of the volute and reduce noise. The air guide component includes an arc; a cavity disposed inside the air guide component and below the arc; the arc has at least one airflow hole communicating with the cavity; one end of the arc is connected to the volute tongue, and the other end is connected to the inner surface of the flange. The air guide component guides the airflow, preventing the formation of eddies and noise generation; the cavity structure provides sound absorption and noise reduction.

Description

Technical Field

[0001] This utility model relates to the field of home appliance technology, specifically to a fan. Background Technology

[0002] In air handling equipment such as multi-split total heat exchange indoor units and multi-split fresh air units, the fan system is the core for realizing air circulation and transportation, and its performance directly affects the heat exchange efficiency, energy consumption, and operating noise of the equipment. Among them, the volute, as a key component of the fan, is responsible for collecting and guiding the airflow generated by the impeller and realizing the conversion of kinetic energy into static pressure energy, while the outlet flange connected at the outlet of the volute is the terminal structure for airflow output. The matching accuracy between the two is crucial to the energy loss and noise control of the entire duct system.

[0003] In traditional designs, the outlet flange often employs a uniform flared or constricted structure along its circumference. When this type of flange is matched with the volute, the uneven velocity distribution of the airflow at the volute outlet easily leads to diffusion losses, contraction losses, and impact losses, resulting in a decrease in the effective static pressure of the fan and a reduction in energy conversion efficiency. To prevent airflow backflow in the volute outlet area, the volute is usually designed with a deep volute tongue and a downward-pressing structure on the upper extension section of the volute. Although this can suppress backflow to some extent, it further exacerbates the diffusion losses at the outlet flange. That is, the airflow forms vortices in the transition area between the deep volute tongue and the flange. At the same time, airflow impact is easily generated on the flange surface below the volute tongue, causing additional energy loss and generating significant aerodynamic noise, including blade passing frequency noise, affecting the comfort of equipment operation.

[0004] Existing technologies address the aforementioned problems by altering the relative positions of the flange and the air outlet, such as adjusting the flange's installation angle and distance, to reduce diffusion losses. However, such solutions only alleviate localized losses under specific operating conditions and cannot fundamentally improve the compatibility between the airflow at the volute outlet and the flange structure, thus limiting their applicability. When the volute outlet undergoes significant changes in size or shape due to equipment model iterations or changes in operating requirements, the matching error between the traditional uniform flange structure and the volute increases significantly, easily leading to problems such as airflow separation and increased turbulence, generating abnormal noises such as whistling sounds, and affecting equipment stability. Utility Model Content

[0005] This utility model solves, to at least a certain extent, one of the technical problems in the related art.

[0006] Therefore, this application aims to provide a fan.

[0007] To achieve the above objectives, in a first aspect, a fan is provided, comprising: A volute, wherein an outlet is provided on the volute; the volute includes a volute tongue, which is disposed at the edge of the outlet of the volute; The fan blades rotate inside the volute, generating airflow; A drive unit is used to drive the fan blades to rotate, and the airflow is discharged from the outlet of the volute. A flange for connecting the outlet of the volute; An air guide is disposed between the volute tongue and the flange. The air guide is used to even out the distribution of airflow at the outlet of the volute and reduce noise. The air guide component includes: An arc, the center of which faces one side of the flange; A cavity is disposed inside the air guide and below the arc; at least one airflow hole is provided on the arc, and the airflow hole communicates with the cavity. One end of the arc is connected to the volute tongue, and the other end is connected to the inner surface of the flange.

[0008] In the technical solution, the airflow generated by the drive component driving the fan blades enters the flange through the outlet of the volute. Since there is a guide component between the volute and the flange, the center of the arc of the guide component faces the flange, which guides the direction of the airflow and avoids the formation of eddies and noise. The airflow holes on the arc and the cavity form a small acoustic structure that can play a role in sound absorption and noise reduction.

[0009] In some embodiments of this application, the air guide and the flange are integrally connected.

[0010] In this technical solution, the integrated design eliminates the connection gap between the air guide and the flange, avoiding the air leakage problem caused by assembly errors in the split design. When the airflow flows from the volute outlet across the arc surface of the air guide, it can enter the interior of the flange through a continuous and smooth transition, reducing airflow turbulence and vortex generation at the connection point.

[0011] In some embodiments of this application, the volute tongue includes a diffusion surface; The cross-section of the end of the arc that connects to the volute tongue is defined as the first connecting surface; The diffusion surface and the first connecting surface form an angle of 145°-180° toward the center of the flange.

[0012] In the technical solution, the included angle design of 145°-180° is the optimal range for airflow dynamics and acoustic characteristics. The optimized transition structure between the volute tongue and the air guide achieves uniform airflow distribution and noise reduction.

[0013] In some embodiments of this application, the cross-section of the end of the arc connected to the flange is defined as the second connecting surface; The surface on the inner surface of the flange that connects with the arc is defined as the third connecting surface; The angle between the second connecting surface and the third connecting surface toward the center of the flange is 170°-180°.

[0014] In the technical solution, the included angle of 170°-180° makes the connection between the air guide and the flange closer to surface contact, that is, within the same plane, which can reduce energy loss and optimize the uniformity of airflow.

[0015] In some embodiments of this application, the diameter of the airflow hole is 1mm-3mm.

[0016] In this technical solution, a diameter of 1mm-3mm allows the diverted airflow to maintain a dynamic balance with the mainstream airflow. By appropriately diverting the airflow, the velocity gradient of the airflow on the curved surface is reduced, stabilizing the airflow entering the cavity and providing a sound source medium for sound absorption. The volume of the cavity and the diameter of the airflow orifice together determine the resonant frequency. The 1mm-3mm orifice diameter, combined with the cavity structure, can absorb mid-to-high frequency noise during fan operation.

[0017] In some embodiments of this application, the first closed surface is connected to one end of the arc and is used to fit the extended surface of the volute tongue; The second closed surface has one end connected to one end of the first closed surface and the other end connected to the first segment of the arc. Two end-face sealing surfaces are used to seal the two ends of the cavity.

[0018] In the technical solution, the first sealing surface, the second sealing surface, the two end sealing surfaces, and the arc surface together constitute the cavity of the air guide. The airflow enters the cavity through the airflow hole, which plays a role in noise reduction.

[0019] In some embodiments of this application, a gap exists between the flange and the volute outlet; A limiting shoulder is provided on the second sealing surface for connecting and positioning the air guide and the flange. A filling part, which is used to seal gaps.

[0020] In the technical solution, the gap between the flange and the volute needs to be filled with some material to prevent airflow from escaping through the gap.

[0021] In some embodiments of this application, the filling portion is sealing cotton or expanding foam.

[0022] In the technical solution, the filling part uses sealing cotton or expanding foam, which can more efficiently seal the gap between the flange and the volute outlet. Both sealing cotton and expanding foam have good sound absorption and vibration damping properties. The porous structure of the sealing cotton can absorb the high-frequency noise generated by the leaking airflow at the gap, and its elastic properties can buffer the vibration transmission between the flange and the volute during the operation of the fan, reducing the low-frequency noise caused by structural resonance; the elastomer formed after the expanding foam cures can absorb vibration energy through deformation.

[0023] In some embodiments of this application, the airflow hole is a round hole or a diamond-shaped hole.

[0024] In the technical solution, both circular and diamond-shaped holes are easy to process and it is easy to ensure the processing accuracy.

[0025] Secondly, a fan is provided, comprising: A volute, wherein an outlet is provided on the volute; the volute includes a volute tongue, which is disposed at the edge of the outlet of the volute; The fan blades rotate inside the volute, generating airflow; A drive unit is used to drive the fan blades to rotate, and the airflow is discharged from the outlet of the volute. A flange for connecting the outlet of the volute; An air guide is disposed between the volute tongue and the flange. The air guide is used to even out the distribution of airflow at the outlet of the volute and reduce noise. The air guide component includes: An arc, the center of which faces one side of the flange; A cavity is formed between the flange, the arc, and the volute; at least one airflow hole is provided on the arc, and the airflow hole communicates with the cavity. One end of the arc is connected to the volute tongue, and the other end is connected to the inner surface of the flange.

[0026] In this technical solution, the air guide component is part of the flange assembly. The integrated structural design allows airflow to smoothly transition to the inner surface of the flange, reducing impact and turbulence. It also increases its strength, preventing arc deformation even under extreme operating conditions. Furthermore, it reduces installation steps and minimizes performance fluctuations caused by assembly deviations.

[0027] 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

[0028] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 This is a schematic diagram of the overall structure of the fan according to the embodiments of this application; Figure 2 This is a schematic diagram of the overall structure of the fan according to the embodiments of this application; Figure 3 This is a schematic diagram of the overall structure of the fan according to the embodiments of this application; Figure 4 This is a schematic diagram of the air guide structure of a fan according to an embodiment of this application; Figure 5 This is an enlarged view of part A of the fan according to an embodiment of this application; Figure 6 This is an enlarged view of part B of the fan according to the embodiment of this application; Figure 7 This is a schematic diagram of the volute structure according to an embodiment of this application; Figure 8 This is a schematic diagram of the connection structure between the flange and the air guide according to an embodiment of this application; Figure 9 This is a schematic diagram of the connection structure between the flange and the air guide according to an embodiment of this application; Figure 10 This is a simulation diagram of the airflow effect in the existing technology where the volute and flange are directly connected.

[0030] In the above figures: 1. Volute; 11. Volute tongue; 111. Volute tongue diffuser surface; 112. Volute tongue extension surface; 2. Flange; 3. Air guide; 31. Arc; 311. First connecting surface; 312. First connecting angle; 32. Diverting hole; 33. First sealing surface; 34. Second sealing surface; 35. Positioning shoulder; 36. Rounded corner. Detailed Implementation

[0031] In the description of this (utility model / invention), it should be understood that the terms "center", "longitudinal", "lateral", "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 based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances. In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature. In this utility model, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of this utility model. 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. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0032] The present invention will now be described in detail through exemplary embodiments. However, it should be understood that, without further description, elements, structures, and features in one embodiment may be advantageously incorporated into other embodiments.

[0033] It should be noted that in air handling equipment such as multi-split total heat exchange indoor units and multi-split fresh air units, the fan system is the core of achieving air circulation and delivery, and its performance directly affects the equipment's heat exchange efficiency, energy consumption, and operating noise. Among them, the volute, as a key component of the fan, is responsible for collecting and guiding the airflow generated by the impeller and converting kinetic energy into static pressure energy, while the outlet flange connected at the outlet of the volute is the terminal structure for airflow output. The matching accuracy between the two is crucial to the energy loss and noise control of the entire duct system.

[0034] In traditional designs, the outlet flange often employs a uniform flared or constricted structure along its circumference. When this type of flange is matched with the volute, the uneven velocity distribution of the airflow at the volute outlet easily leads to diffusion losses, contraction losses, and impact losses, resulting in a decrease in the effective static pressure of the fan and a reduction in energy conversion efficiency. To prevent airflow backflow in the volute outlet area, the volute is usually designed with a deep volute tongue and a downward-pressing structure on the upper extension section of the volute. Although this can suppress backflow to some extent, it further exacerbates the diffusion losses at the outlet flange. That is, the airflow forms vortices in the transition area between the deep volute tongue and the flange. At the same time, airflow impact is easily generated on the flange surface below the volute tongue, causing additional energy loss and generating significant aerodynamic noise, including blade passing frequency noise, affecting the comfort of equipment operation.

[0035] Existing technologies address the aforementioned problems by altering the relative positions of the flange and the air outlet, such as adjusting the flange's installation angle and distance, to reduce diffusion losses. However, such solutions only alleviate localized losses under specific operating conditions and cannot fundamentally improve the compatibility between the airflow at the volute outlet and the flange structure, thus limiting their applicability. When the volute outlet undergoes significant changes in size or shape due to equipment model iterations or changes in operating requirements, the matching error between the traditional uniform flange structure and the volute increases significantly, easily leading to problems such as airflow separation and increased turbulence, generating abnormal noises such as whistling sounds, and affecting equipment stability.

[0036] Based on this, this application proposes a fan that guides the airflow by setting an air guide at the connection between the volute and the flange. At the same time, an acoustic cavity is set below the air guide, and the airflow is connected to the cavity through an airflow hole, which can continuously and smoothly deliver the airflow, avoid generating eddies, and reduce noise.

[0037] In the following, embodiments of this application will be described in detail with reference to the accompanying drawings. As attached Figures 1 to 10As shown in an illustrative embodiment of the fan of this utility model, the fan includes a volute 1 with an outlet; the volute 1 includes a volute tongue 11, which is disposed at the edge of the outlet of the volute 1. Fan blades rotate within the volute 1, generating airflow. A drive unit is used to drive the fan blades to rotate, and the airflow is discharged from the outlet of the volute 1. A flange 2 is used to connect to the outlet of the volute 1.

[0038] It should be noted that the specific structure of the aforementioned fan, including the volute 1, volute tongue 11, fan blades, drive flange 2, and the fan's operating principle, are all prior art, and their technical details are well known to those skilled in the art. Therefore, they need not be elaborated upon in this application. The improvement in this application lies only in the air guide 3 and does not involve any improvement to the existing structure and operating principle of the fan itself.

[0039] The fan also includes an air guide 3, which is disposed between the volute tongue 11 and the flange 2. The air guide 3 is used to evenly distribute the airflow at the outlet of the volute 1 and reduce noise.

[0040] The air guide 3 includes an arc 31, the center of which faces the side of the flange 2.

[0041] The air guide 3 also includes a cavity, which is disposed inside the air guide 3 and located below the arc 31; at least one airflow hole is provided on the arc 31, and the airflow hole communicates with the cavity.

[0042] One end of the arc 31 is connected to the volute tongue 11, and the other end is connected to the inner surface of the flange 2.

[0043] It should be noted that the airflow generated by the drive component rotating the fan blades flows towards the outlet under the guidance of the volute 1 and enters the interior of the flange 2. There is a structural transition at the connection between the volute 1 and the flange 2. In traditional designs, this area is prone to vortex and impact due to uneven airflow velocity distribution, generating noise. This solution addresses this problem by incorporating a guide vane 3 between the volute 1 and the flange 2.

[0044] The principle is as follows: the arc 31 of the air guide 3 is a smooth transition surface, with its center facing the flange 2. When the airflow flows out from the outlet of the volute 1 and reaches the surface of the arc 31, it will move forward along the arc 31, avoiding the vortex phenomenon formed by the sudden change of airflow direction at the junction of the volute tongue 11 and the flange 2. The arc 31 can evenly distribute the airflow that was originally concentrated in the local area of ​​the outlet of the volute 1 to the entire cross-section of the flange 2, reducing the turbulence noise caused by the difference in airflow velocity, reducing the direct impact of the airflow on the inner wall of the flange 2, and weakening the generation of impact noise.

[0045] Furthermore, the cavity inside the air guide 3 and at least one airflow hole on the arc 31 form a small acoustic structure. When airflow passes over the surface of the arc 31, some airflow enters the cavity through the airflow hole. The airflow entering the cavity undergoes reflection, interference, and friction within the cavity, causing the vibration energy of the airflow to be consumed, thereby achieving a sound absorption effect. The cavity can absorb noise energy of specific frequencies through resonance, reducing the overall noise level.

[0046] Furthermore, one end of the arc 31 is connected to the volute tongue 11, and the other end is connected to the inner surface of the flange 2. This connection method allows the air guide 3, the volute 1, and the flange 2 to form a continuous airflow channel, ensuring stable airflow throughout the entire flow path. The air guide 3 can evenly distribute the airflow at the outlet of the volute 1, improving the aerodynamic performance of the fan and reducing noise, allowing the fan to maintain efficient and low-noise operation even under complex conditions such as high static pressure.

[0047] In some embodiments, the air guide 3 and the flange 2 are integrally connected. In this integral connection, there is no gap between the air guide 3 and the flange 2, avoiding air leakage problems caused by assembly errors in a split design. When the airflow flows from the outlet of the volute 1 across the arc 31 surface of the air guide 3, it smoothly enters the interior of the flange 2, reducing airflow turbulence and eddy current generation at the connection point. The uniform flow of air along the flange 2 reduces turbulent noise and impact noise.

[0048] Furthermore, the integrated design enhances the overall rigidity of the air guide 3 and the flange 2, simplifying the production and assembly process. The air guide 3 and flange 2 no longer require separate positioning and connection, reducing assembly steps and sources of error, lowering manufacturing costs, and improving the reliability of the fan product.

[0049] In some embodiments, the volute tongue 11 includes a diffusion surface; the tangent at one end of the arc 31 connected to the volute tongue 11 is defined as the first connecting surface 311; the angle formed between the diffusion surface and the first connecting surface 311 toward the flange 2 is defined as the first connection angle 312, which is 145°-180°.

[0050] Furthermore, the 145°-180° angle range provides a guide for the airflow transition from the volute tongue 11 to the arc 31 of the air guide component 3. When the airflow flows through the volute tongue 11 region, the first connecting surface 311 is the interface between the arc 31 and the volute tongue 11, and the angle formed between it and the diffuser surface determines the smoothness of the airflow turning. If the angle is less than 145°, the angle formed by the two surfaces is sharp, and the airflow is prone to separation at the corner, forming local vortices, resulting in increased energy loss and high-frequency turbulent noise; if the angle is greater than 180°, the diffuser surface and the first connecting surface 311 form an outward-facing structure, which will cause the airflow to break away from the constraint of the air guide component 3 too early, resulting in disordered diffusion before entering the flange component 2, disrupting the uniformity of the airflow. The near-flat angle connection reduces the airflow turning resistance, while the moderate angle maintains effective constraint on the airflow, allowing the airflow to flow from the diffuser surface to the surface of the arc 31. This minimizes the impact loss of the airflow at the connection between the volute tongue 11 and the air guide component 3, avoiding the noise source generated by vortices.

[0051] In some embodiments, the cross-section of the end of the arc 31 that is connected to the flange 2 is defined as the second connecting surface; the surface of the inner surface of the flange 2 that is connected to the arc 31 is defined as the third connecting surface; the included angle between the second connecting surface and the third connecting surface toward the center of the flange 2 is 170°-180°.

[0052] In some embodiments, since the arc 31 has a certain thickness, when the arc 31 is connected to the inner surface of the flange 2, a certain height difference will occur, and a fillet 36 is provided at this height difference for transition.

[0053] Furthermore, the near-straight transition of the connecting angle reduces the turning resistance of the airflow at the junction of the arc 31 of the air guide 3 and the inner surface of the flange 2. When the airflow is guided to the inlet of the flange 2 via the arc 31, the gentle angle formed by the second and third connecting surfaces can prevent airflow separation caused by an excessively small angle, thus avoiding the formation of local vortices, energy loss, and turbulent noise. With an angle design of 170°-180°, the airflow transitions smoothly from the surface of the arc 31 to the inner surface of the flange 2 without impact, flowing steadily along the extension direction of the flange 2, reducing the noise generated by airflow impact.

[0054] In some embodiments, the diameter of the airflow orifice is set to 1mm-3mm. When the airflow flows along the arc 31 surface of the air guide 3, some of the airflow will enter the cavity through the airflow orifice. This diameter range can prevent excessive diversion of the mainstream airflow due to an excessively large orifice diameter. If the orifice diameter is too large, a large amount of airflow rushing into the cavity will disrupt the stability of the mainstream airflow and instead form new turbulence on the surface of the arc 31. It can also prevent insufficient diversion and excessive wind resistance due to an excessively small orifice diameter. An excessively small orifice diameter will make it difficult for the airflow to enter the cavity, failing to play the role of diversion and noise reduction, and may also produce a whistling sound due to excessively high airflow velocity inside the orifice. A diameter of 1mm-3mm allows the diverted airflow to maintain a dynamic balance with the mainstream airflow.

[0055] The airflow holes and the cavity form a highly efficient resonant sound-absorbing structure. The volume of the cavity and the diameter of the airflow holes together determine the resonant frequency. The 1mm-3mm hole diameter and cavity structure can specifically absorb mid-to-high frequency noise during fan operation. When sound waves enter the cavity through the airflow holes, the air column resonates with the cavity wall inside the holes, converting sound energy into heat energy. At the same time, the 1mm-3mm hole diameter does not excessively weaken the structural rigidity of the arc 31. Even under high static pressure conditions, it can avoid deformation of the arc 31 caused by too many or too large openings, ensuring the overall stability of the air guide 3. It also facilitates mass production, controlling production costs while ensuring hole diameter accuracy, and adapting to the needs of industrial mass production.

[0056] In some embodiments, the aperture is 1 mm, ...; In some embodiments, the aperture is 3 mm, ... In some embodiments, the aperture is 1mm~3mm, ...; if it is less than 1mm, then... In some embodiments, the first sealing surface 33 is connected to one end of the arc 31, and the first sealing surface 33 is used to fit the volute tongue extension surface 112; the second sealing surface 34 has one end connected to one end of the first sealing surface 33 and the other end connected to the first segment of the arc 31; the two end sealing surfaces are used to seal the two ends of the cavity.

[0057] Furthermore, the volute tongue 11 includes a volute tongue extension surface 112. A first sealing surface 33 is used to fit the volute tongue extension surface 112. If there is a gap here, some airflow will bypass the air guide 3 and leak directly, causing turbulence in the mainstream airflow and reducing the sound absorption efficiency of the cavity. A second sealing surface 34 is used to connect the first sealing surface 33 and the arc 31, sealing the bottom of the cavity. The two end sealing surfaces seal the sides of the cavity, maintaining the closed volume of the cavity.

[0058] In some embodiments, there is a gap between the flange 2 and the outlet of the volute 1; a limiting shoulder is provided on the second sealing surface 34 for connecting and positioning the air guide 3 and the flange 2; and a filling part is provided to seal the gap.

[0059] Furthermore, the gap between flange 2 and the outlet of volute 1 will generate additional noise due to the interference between the leaking airflow and the mainstream airflow. The limiting shoulder on the second sealing surface 34 is used for positioning and connecting the air guide 3. Because the limiting shoulder exists between the volute tongue 11 and flange 2, a certain connection gap is formed between them, which needs to be sealed with sealing material.

[0060] In some embodiments, the filler is sealing cotton or expanding foam. Sealing cotton is porous and highly elastic; when filled into gaps, it adheres tightly to the contact surface between the flange 2 and the outlet of the volute 1 through its own elasticity, effectively preventing airflow leakage. Expanding foam is liquid before curing, allowing it to fully penetrate the corners of gaps. After curing, it forms a sealed structure with a certain degree of elasticity, capable of sealing visible and difficult-to-observe gaps.

[0061] Both the sealing cotton and the expanding foam have excellent sound absorption and vibration damping properties. The porous structure of the sealing cotton can absorb high-frequency noise generated by leaking airflow in the gaps, and its elasticity can buffer the vibration transmission between the flange 2 and the volute 1 during the operation of the fan, reducing low-frequency noise caused by structural resonance. The elastomer formed after the expanding foam cures can absorb vibration energy through deformation, reducing the rigid collision noise between metal parts. Together with the sound-absorbing structure of the cavity of the air guide 3, it forms a sound absorption and noise reduction effect, improving the sound absorption and noise reduction effect.

[0062] In some embodiments, the airflow orifice is a circular orifice, a rhomboid orifice, or other polygonal orifice. Circular orifices and polygonal orifices with equal adjacent sides are easy to manufacture. Circular orifices have a circumferentially symmetrical structure; when airflow passes through the arc 31 surface, the resistance distribution of the circular orifice is uniform, avoiding localized airflow turbulence caused by orifice asymmetry, making circular orifices the optimal choice. When airflow enters the cavity through a circular orifice, the resulting jet direction is more stable, uniformly filling the cavity and reducing the formation of vortices near the orifice opening. The manufacturing process for circular orifices is mature; within a diameter range of 1mm-3mm, precise machining can be performed, balancing the ratio of mainstream airflow to diverted airflow.

[0063] Furthermore, the resonant system formed by the circular aperture and the cavity has a more stable frequency response. The circular cross-section of the aperture results in a single vibration mode for the air column within it, with a concentrated resonant frequency, enabling targeted absorption of noise in a specific frequency band. Combined with the volumetric design of the cavity, accurate noise reduction can be achieved. In contrast, the presence of edges and corners in the rhomboid aperture leads to a more complex vibration mode for the air column within it, which can excite resonance in more frequency bands and cover a wider noise spectrum.

[0064] In some embodiments, a fan includes a volute 1 with an outlet; the volute 1 includes a volute tongue 11 disposed at the edge of the outlet of the volute 1; a fan blade that rotates inside the volute 1 to generate airflow; a drive member for driving the fan blade to rotate, and the airflow being discharged from the outlet of the volute 1; and a flange 2 for connecting to the outlet of the volute 1.

[0065] Furthermore, the fan also includes an air guide 3, which is disposed between the volute tongue 11 and the flange 2. The air guide 3 is used to evenly distribute the airflow at the outlet of the volute 1 and reduce noise.

[0066] Furthermore, the air guide 3 includes an arc 31, with the center of the arc 31 facing one side of the flange 2; the arc 31 is used to guide the airflow along the arc 31 to avoid generating vortices. One end of the arc 31 is connected to the volute tongue 11, and the other end is connected to the inner surface of the flange 2.

[0067] Furthermore, the air guide 3 also includes a cavity, which is formed between the flange 2, the arc 31, and the volute 11; at least one airflow hole is provided on the arc 31, and the airflow hole communicates with the cavity. Furthermore, in this embodiment, the cavity structure is formed by the flange 2, the volute 11, and the arc 31, and then the two ends are closed by the end face sealing surfaces on both sides. That is, the end face extension surface of the volute 11 and the inner surface of the flange 2 replace the first sealing surface 33 and the second sealing surface 34. The arc 31 and the end face sealing surfaces at both ends can be fixed to the inner surface of the flange 2 by welding or integral molding. If welding is used, the connection between the components can be strengthened, and the arc 31, the end face sealing surface and the flange 2 can form a whole, effectively resisting the external force brought by the airflow impact. The integral molding process allows the component to become part of the flange 2 from the production stage, completely eliminating the problems that may be caused by the connection gap. Both welding and integral molding connection methods enhance the stability of the overall structure. It can realize the reuse of space, meet the sound absorption requirements, and does not occupy additional space. It helps to improve the compactness of the internal structure of multi-split total heat indoor units, multi-split fresh air units, etc., and helps to reduce the size and weight of the equipment as a whole, and improve the adaptability of the equipment in the installation environment.

[0068] Furthermore, this design avoids the problem of large gaps appearing after the separate air guide component 3 is installed. Large gaps between the air guide component 3 and related parts due to insufficient installation precision can lead to airflow leakage, causing turbulent eddies and generating additional noise. In this solution, a cavity is constructed using the existing structure, and related parts are fixed by welding or integral molding, reducing the number of connection interfaces between components and minimizing the occurrence of gaps. The integrated structural design allows airflow to smoothly transition to the inner surface of the flange, reducing impact and turbulence. It also increases its strength, preventing deformation of the arc 31 even under extreme operating conditions. This reduces installation steps and minimizes performance fluctuations caused by assembly deviations.

[0069] For ease of explanation, the above description has been provided in conjunction with specific embodiments. However, the above exemplary discussion is not intended to be exhaustive or to limit the embodiments to the specific forms disclosed above. Various modifications and variations can be obtained based on the above teachings. The selection and description of the above embodiments are for the purpose of better explaining the principles and practical applications, thereby enabling those skilled in the art to better utilize the embodiments and various different variations of the embodiments suitable for specific application considerations.

Claims

1. A fan, characterized in that, include: A volute, wherein an outlet is provided on the volute; the volute includes a volute tongue, which is disposed at the edge of the outlet of the volute; The fan blades rotate inside the volute, generating airflow; A drive unit is used to drive the fan blades to rotate, and the airflow is discharged from the outlet of the volute. A flange for connecting the outlet of the volute; An air guide is disposed between the volute tongue and the flange. The air guide is used to even out the distribution of airflow at the outlet of the volute and reduce noise. The air guide component includes: An arc, the center of which faces one side of the flange; A cavity is disposed inside the air guide and below the arc; at least one airflow hole is provided on the arc, and the airflow hole communicates with the cavity. One end of the arc is connected to the volute tongue, and the other end is connected to the inner surface of the flange.

2. The fan according to claim 1, characterized in that: The air guide component and the flange component are integrally connected.

3. The fan according to claim 1, characterized in that: The cochlear tongue includes a diffusion surface; The cross-section of the end of the arc that connects to the volute tongue is defined as the first connecting surface; The diffusion surface and the first connecting surface form an angle of 145°-180° toward the center of the flange.

4. The fan according to claim 1, characterized in that: The tangential surface at the end of the arc that connects to the flange is defined as the second connecting surface; The surface on the inner surface of the flange that connects with the arc is defined as the third connecting surface; The angle between the second connecting surface and the third connecting surface toward the center of the flange is 170°-180°.

5. The fan according to claim 1, characterized in that: The diameter of the airflow hole is 1mm-3mm.

6. The fan according to claim 1, characterized in that, The cavity includes: a first closed surface connected to one end of the arc, used to fit the extended surface of the volute tongue; The second closed surface has one end connected to one end of the first closed surface and the other end connected to the first segment of the arc. Two end-face sealing surfaces are used to seal the two ends of the cavity.

7. The fan according to claim 1, characterized in that, There is a gap between the flange and the volute outlet; A limiting shoulder is provided on the second sealing surface for connecting and positioning the air guide and the flange. A filling part, which is used to seal gaps.

8. The fan according to claim 7, characterized in that, The filling part is sealing cotton or expanding foam.

9. The fan according to claim 1, characterized in that, The airflow hole is a round hole or a diamond-shaped hole.

10. A fan, characterized in that, include: A volute, wherein an outlet is provided on the volute; the volute includes a volute tongue, which is disposed at the edge of the outlet of the volute; The fan blades rotate inside the volute, generating airflow; A drive unit is used to drive the fan blades to rotate, and the airflow is discharged from the outlet of the volute. A flange for connecting the outlet of the volute; An air guide is disposed between the volute tongue and the flange. The air guide is used to even out the distribution of airflow at the outlet of the volute and reduce noise. The air guide component includes: An arc, the center of which faces one side of the flange; A cavity is formed between the flange, the arc, and the volute; at least one airflow hole is provided on the arc, and the airflow hole communicates with the cavity. One end of the arc is connected to the volute tongue, and the other end is connected to the inner surface of the flange.

Images