Fan

Abstract

The utility model relates to the technical field of fans, in particular to a fan. The utility model relates to a fan which comprises a front shell, a rear shell, a front cover and a rear cover. The impeller is positioned in the accommodating cavity; the rear shell covers the front shell, the rear shell is provided with an air inlet, at least part of the rear shell surrounds part of the peripheral side of the front shell, and an air outlet is formed between the rear shell and the front shell; a part of the inner wall of the front shell protrudes to form a first air guide part, the edge of the front shell is bent towards the containing cavity to form a first bent part, and a first sound absorption cavity is formed between the first air guide part and the first bent part. The sound absorption and noise reduction device is provided with multiple sound absorption cavity structures, the sound absorption cavity structures can be matched with one another, sound noise of different frequencies is absorbed, and the overall sound absorption and noise reduction performance is greatly improved.

Description

[0001] This application claims priority to Chinese Patent Application No. 202423093078.0, filed on December 14, 2024, entitled "A Bladeless Fan", the entire contents of which are incorporated herein by reference.

[0002] This application claims priority to Chinese Patent Application No. 202423297651.X, filed on December 27, 2024, entitled "Bladeless Fan", the entire contents of which are incorporated herein by reference.

[0003] This application claims priority to Chinese Patent Application No. 202520076459.3, filed on January 13, 2025, entitled "Bladeless Fan", the entire contents of which are incorporated herein by reference. Technical Field

[0004] This application relates to the field of fan technology, and more particularly to a fan. Background Technology

[0005] A fan is an electrical device that uses an electric motor to drive an impeller to rotate, thereby accelerating the circulation of air. It is mainly used for cooling and ventilating the air and is an essential household item for people in summer.

[0006] A fan typically consists of a housing and an impeller located inside the housing. The housing has an air outlet and an air inlet. When the impeller rotates, it drives the surrounding air to circulate, thus generating wind. However, during operation, the airflow of a fan can easily generate noise, which can affect the user experience. Utility Model Content

[0007] To address the problems mentioned in the background art, reduce the noise generated by the fan during operation, and improve the user experience, this application provides a fan. This application relates to a fan comprising: a front housing having a receiving cavity; an impeller located within the receiving cavity; and a rear housing covering the front housing, having an air inlet, at least a portion of the rear housing surrounding a portion of the outer periphery of the front housing, and an air outlet formed between the rear housing and the front housing.

[0008] A first air guide portion is formed by a protrusion on the inner wall of the front housing, and a first curved portion is formed by bending the edge of the front housing toward the receiving cavity. A first sound-absorbing cavity is formed between the first air guide portion and the first curved portion.

[0009] According to an embodiment provided by the application, one end of the rear shell extends into the accommodating cavity of the front shell; a second air guide part is formed by protruding part of the inner wall of the rear shell; the edge of the end of the rear shell extending into the accommodating cavity is bent to form a second bending part, and a second sound absorption cavity is formed between the second air guide part and the second bending part.

[0010] According to an embodiment provided by the application, the fan further comprises an auxiliary shell, one end of the rear shell extends into the accommodating cavity of the front shell, the auxiliary shell is sleeved on the end of the rear shell extending into the accommodating cavity, and a gap is formed between the auxiliary shell and the accommodating cavity; a third air guide part is formed by protruding part of the inner wall of the rear shell, and a third sound absorption cavity is formed between the auxiliary shell and the third air guide part.

[0011] According to an embodiment provided by the application, the air inlet is located at the central part of the rear shell, and the impeller is at least partially located at the air inlet; the fan further comprises a rear cover, the rear cover covers the air inlet of the rear shell, and a gap is formed between the rear cover and the rear shell, the gap forms a ventilation channel, and the ventilation channel is in communication with the air inlet.

[0012] According to an embodiment provided by the application, a plurality of first partitions are arranged around the air outlet, the plurality of first partitions can also be mounted on the outer periphery of the front shell, the plurality of first partitions can also be mounted on the inner wall of the rear shell, and the first partitions divide the air outlet into a plurality of air outlet channels.

[0013] According to an embodiment provided by the application, a plurality of second partitions are arranged on the auxiliary shell, the second partitions are arranged around the auxiliary shell, and the second partitions divide the third sound absorption cavity into a plurality of sound absorption sub-cavities.

[0014] According to an embodiment provided by the application, a plurality of sound absorption holes are formed in the bottom wall of the front shell, the plurality of sound absorption holes are uniformly distributed on the bottom wall of the front shell, and the sound absorption holes are in communication with the accommodating cavity.

[0015] According to an embodiment provided by the application, the fan further comprises sound absorption cotton, the sound absorption cotton is located on the outer side of the front shell and in contact with the bottom wall of the front shell, and one end of the sound absorption hole is in communication with the sound absorption cotton.

[0016] According to an embodiment provided by the application, the fan provided by the application can be a handheld fan, a desktop fan or a floor fan.

[0017] According to an embodiment provided by the application, the impeller provided by the application can be a centrifugal impeller or a mixed flow impeller.

[0018] Compared with the prior art, the application has the following beneficial effects: the application has various sound absorption cavity structures, and the various sound absorption cavity structures can cooperate with each other to absorb sound noise of different frequencies, greatly improving the overall sound absorption and noise reduction performance; the application is provided with various air guide parts, the air guide parts can accurately guide the airflow direction, and the airflow flows stably to reduce turbulence and vortex phenomena; and the application is further provided with a baffle structure at the air outlet, which can guide the airflow to be discharged more uniformly from the inside of the fan. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced. Obviously, the drawings in the following description can also be obtained by those skilled in the art without creative effort on the basis of these drawings.

[0020] Figure 1 A fan three-dimensional structure schematic diagram provided by the embodiment of the present application;

[0021] Figure 2 A Figure 1 Another perspective structural schematic diagram;

[0022] Figure 3 A cross-sectional structure schematic diagram of a centrifugal impeller fan provided by the embodiment of the present application;

[0023] Figure 4 An explosion structural schematic diagram of a centrifugal impeller fan provided by the embodiment of the present application;

[0024] Figure 5 A Figure 4 Another perspective structural schematic diagram;

[0025] Figure 6 A structural schematic diagram of connection between a front shell and a rear shell in a centrifugal impeller fan scheme provided by the embodiment of the present application;

[0026] Figure 7 A partial front shell structure schematic diagram provided by the embodiment of the present application;

[0027] Figure 8 A rear shell structure schematic diagram provided by the embodiment of the present application;

[0028] Figure 9 A Figure 7 Another perspective structural schematic diagram;

[0029] Figure 10 A cross-sectional structure schematic diagram of a mixed flow impeller fan provided by the embodiment of the present application;

[0030] Figure 11 A structure diagram of a mixed-flow impeller fan rear shell and an auxiliary shell provided by the embodiment of the present application is shown in the figure;

[0031] Figure 12 An explosion structure diagram of a mixed-flow fan provided by the embodiment of the present application is shown in the figure;

[0032] Figure 13 A structure diagram of the embodiment of the present application is shown in the figure. Figure 12 A structure diagram of another view is shown in the figure.

[0033] Reference signs:

[0034] 110 - front shell; 111 - containing cavity; 112 - first air guide part; 113 - first bending part; 114 - first sound absorption cavity; 115 - sound absorption hole; 120 - impeller; 130 - rear shell; 131 - air inlet; 132 - air outlet; 1321 - air outlet channel; 133 - second air guide part; 134 - second bending part; 135 - second sound absorption cavity; 136 - third air guide part; 137 - third sound absorption cavity; 138 - first partition; 140 - auxiliary shell; 141 - second partition; 150 - rear cover body; 151 - ventilation channel; 160 - sound absorption cotton. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme of the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the present application.

[0036] A fan is an electrical appliance that uses a motor to drive an impeller to rotate to achieve air acceleration and circulation. It is mainly used for cooling and air circulation and is a necessary summer household appliance for people.

[0037] A fan usually includes a shell and an impeller located in the shell. The shell has an air outlet and an air inlet. The impeller drives the surrounding air to flow when it rotates, thereby generating wind. However, during the operation of the fan, air flow can easily produce noise, thereby affecting the user experience.

[0038] In the description of the application, it needs to be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the application.

[0039] In the description of the application, it needs to be understood that the terms "include" and "have" and any variations thereof used herein are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device including a series of steps or units does not have to be limited to those steps or units clearly listed, but can include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0040] Unless otherwise explicitly specified and limited, the terms "mount", "connect", "connect", "fix" and the like should be broadly understood, for example, it can be fixed connection, or detachable connection, or become an integral part; it can be directly connected, or indirectly connected through an intermediate medium, it can be connected inside two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the application can be understood according to the specific circumstances. In addition, the terms "first", "second" and the like are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated.

[0041] Reference Figure 1 A fan three-dimensional structure schematic diagram provided by an embodiment of the application; Figure 2 A fan three-dimensional structure schematic diagram provided by an embodiment of the application; Figure 1 Another perspective structural schematic diagram; Figure 3 A cross-sectional structural schematic diagram of a centrifugal impeller fan provided by an embodiment of the application; Figure 4 An exploded structural schematic diagram of a centrifugal impeller fan provided by an embodiment of the application; Figure 5 A fan three-dimensional structure schematic diagram provided by an embodiment of the application; Figure 4 Another perspective structural schematic diagram; Figure 6 A structural schematic diagram of the connection between the front shell and the rear shell in the centrifugal impeller fan scheme provided by an embodiment of the application; Figure 7 A partial front shell structural schematic diagram provided by an embodiment of the application; Figure 8 A rear shell structural schematic diagram provided by an embodiment of the application; Figure 9 A fan three-dimensional structure schematic diagram provided by an embodiment of the application; Figure 7 Another perspective structural schematic diagram; Figure 10This is a cross-sectional structural diagram of the mixed-flow impeller fan provided in an embodiment of this application; Figure 11 This is a schematic diagram of the connection between the rear housing and the auxiliary housing of the mixed-flow impeller fan provided in an embodiment of this application; Figure 12 This is a schematic diagram of the exploded structure of the mixed-flow fan provided in an embodiment of this application; Figure 13 for Figure 12 A structural diagram from another perspective.

[0042] To address the problems mentioned in the background art, reduce fan noise, and improve user experience, this application provides a fan. Figure 1 As shown, this application relates to a fan, which includes a front housing 110 having a receiving cavity 111; an impeller 120 located within the receiving cavity 111; and a rear housing 130 covering the front housing 110, having an air inlet 131, at least a portion of the rear housing 130 surrounding a portion of the outer periphery of the front housing 110, and an air outlet 132 formed between the rear housing 130 and the front housing 110.

[0043] A first air guide portion 112 is formed by a protrusion on part of the inner wall of the front housing 110, and a first curved portion 113 is formed by bending the edge of the front housing 110 toward the receiving cavity 111. A first sound-absorbing cavity 114 is formed between the first air guide portion 112 and the first curved portion 113.

[0044] like Figures 1-3 As shown, it should be noted that when the impeller 120 rotates and the airflow flows from the air inlet 131 into the receiving cavity 111, the airflow will flow along the shape of the inner wall. The first air guide 112 can guide the direction of the airflow, optimize the airflow velocity distribution, and make the airflow flow along the direction of the extension of the first air guide 112, so as to avoid chaotic collisions and backflows of the airflow in the receiving cavity 111, thereby reducing the noise caused by airflow turbulence.

[0045] Furthermore, the first curved portion 113 and the first air guide portion 112 cooperate to form a first sound-absorbing cavity 114 with a semi-enclosed structure. The first curved portion 113 bends from the edge of the rear end of the front housing 110 toward the receiving cavity 111. This hook-shaped structure allows the airflow to cooperate with the first air guide portion 112 to form an airflow wall when it passes through, which can trap the sound in the first sound-absorbing cavity 114.

[0046] Further, the airflow generated during the operation of the fan carries sound waves, and part of the sound waves carried by the airflow flow into the first sound absorption cavity 114. Due to the airflow wall formed at the entrance of the first sound absorption cavity 114, the airflow continuously reflects in the semi-enclosed space when entering the first sound absorption cavity 114. During multiple reflections, sound energy is gradually consumed, and noise is effectively trapped inside the sound absorption cavity, thereby greatly reducing the noise transmitted outward, playing a core role in creating a quiet operating environment for the fan, so that users can enjoy the comfortable breeze brought by the fan without being disturbed by noise.

[0047] When the fan operates at a low speed, the first sound absorption cavity 114 can effectively absorb the low-frequency noise generated by the operation of the motor, and the first air guide part 112 guides the airflow to pass through the fan smoothly, thereby reducing the noise generated by the airflow;

[0048] When the fan operates at a high speed, the airflow speed increases significantly, and the generated noise is more obvious. However, due to the semi-enclosed structure of the first sound absorption cavity 114, high-frequency noise can be effectively absorbed. At the same time, the air guide structure can still maintain relatively stable high-speed airflow, reducing additional noise generated by airflow turbulence, thereby ensuring that the fan can maintain a relatively low noise level at high speed, providing a more quiet and comfortable use environment for users.

[0049] According to an embodiment provided by the present application, as shown in Figures 3-5 The end of the rear shell 130 extends into the accommodating cavity 111 of the front shell 110, part of the inner wall of the rear shell 130 protrudes to form a second air guide part 133, and the edge of the end of the rear shell 130 extending into the accommodating cavity 111 is bent towards the inner wall of the front shell 110 to form a second bending part 134. The second air guide part 133 and the second bending part 134 form a second sound absorption cavity 135 therebetween.

[0050] It should be noted that the external airflow flows through the second air guide part 133 and the first air guide part 112 by the Coanda effect, and finally flows out from the air outlet 132. The general shape of the airflow is S-shaped or mirror-image S-shaped. The second sound absorption cavity 135 is arranged on the rear shell 130 and is arranged on one side of the first sound absorption cavity 114. When the airflow flows into the inside of the fan, the airflow can pass through the two sound absorption cavities in sequence, increasing the path and number of times of noise absorption. For example, part of the noise enters the first sound absorption cavity 114, and another part is reflected and absorbed in the second sound absorption cavity 135, thereby further improving the overall sound absorption and noise reduction effect.

[0051] Meanwhile, this application also provides a partition plate inside the second sound-absorbing cavity 135, that is, a partition plate is provided on the inner side of the second curved portion 134, further dividing the second sound-absorbing cavity 135 into multiple sound-absorbing cavity structures. These partition plates not only enhance the structural stability of the rear housing 130, but also further buffer and slow down the incoming turbulent airflow before it enters the air outlet 132, thereby reducing the noise generated by the airflow; on the other hand, the airflow being diverted by multiple partition plates can also reduce the impedance of the airflow itself and reduce the possibility of airflow turbulence formation, thereby reducing noise.

[0052] According to an embodiment provided in this application, such as Figures 11-13 As shown, the fan also includes: an auxiliary housing 140, one end of the rear housing 130 extending into the receiving cavity 111 of the front housing 110, the auxiliary housing 140 being sleeved on the end of the rear housing 130 extending into the receiving cavity 111, and there is a gap between the auxiliary housing 140 and the receiving cavity 111; a third air guide portion 136 is formed by a protrusion on a portion of the inner wall of the rear housing 130, and a third sound absorption cavity 137 is formed between the auxiliary housing 140 and the third air guide portion 136.

[0053] It should be noted that the auxiliary housing 140 is configured in a scheme using the mixed-flow impeller 120. The auxiliary housing 140 is sleeved on the outer side of the end of the rear housing 130 extending towards the receiving cavity 111, and is connected by at least four thin fixing rods provided on the rear housing 130. Since the auxiliary housing 140 is sleeved on the end of the rear housing 130 that extends into the receiving cavity 111, and there is a gap between the auxiliary housing 140 and the receiving cavity 111, a third air guide 136 is formed by protrusion on the inner wall of the rear housing 130. The third air guide 136 and the auxiliary housing 140 form a third sound-absorbing cavity 137, which is a fan configuration for the mixed-flow impeller 120. The fixed connection between the auxiliary housing 140 and the rear housing 130 can also be in other ways, which are not limited here.

[0054] For the mixed-flow impeller 120, the airflow during operation involves both axial and radial flow, and the third guide vane 136 plays a guiding role. When the mixed-flow impeller 120 rotates at high speed and drives the airflow, the third guide vane 136 can accurately guide the airflow direction according to the airflow characteristics of the mixed-flow impeller 120, making the transition of airflow in the axial and radial directions smoother, reducing airflow collision and turbulence, and thus reducing noise caused by airflow turbulence. At the same time, the rationally designed third guide vane 136 can also optimize the airflow velocity distribution and improve the air output efficiency of the mixed-flow impeller 120 fan.

[0055] Of course, in other embodiments, the auxiliary housing 140 is arranged in the accommodating cavity 111 and is spaced apart from one end of the rear housing 130 facing the accommodating cavity 111, and a third sound absorption cavity 137 is formed between the third air guide part 136 and the auxiliary housing 140. Further, a semi-closed third sound absorption cavity 137 is formed between the third air guide part 136, the auxiliary housing 140, and the rear housing 130 located therebetween. Such a structure can be used in both the mixed-flow impeller 120 and the centrifugal impeller 120, which is not limited herein.

[0056] According to an embodiment provided by the present application, as shown in Figure 3 and Figure 10 The air inlet 131 is located at the central part of the rear housing 130, and the impeller 120 is at least partially located at the air inlet 131. The fan further comprises a rear cover body 150, which is arranged at the air inlet 131 of the rear housing 130, and the rear cover body 150 has a gap with the rear housing 130, and the gap forms a ventilation channel 151, which is in communication with the air inlet 131. Of course, the rear cover body 150 can also be formed with a through hole, which communicates the ventilation channel 151 with the outside, that is, the rear cover body 150 can also have an air inlet function.

[0057] It should be noted that the rear cover body 150 is arranged in both the mixed-flow impeller 120 and the centrifugal impeller 120, and the ventilation channel 151 formed by the rear cover body 150 and the rear housing 130 is in communication with the air inlet 131, which greatly optimizes the air inlet mode of the fan.

[0058] For the mixed-flow impeller 120, the axial and radial flow of the airflow is relatively complex during operation. The ventilation channel 151 can preliminarily guide and comb the entering airflow, so that the airflow enters the air inlet 131 more orderly, and then reaches the mixed-flow impeller 120. This helps to reduce the turbulence of the airflow when entering the impeller 120, improves the working efficiency of the mixed-flow impeller 120, and reduces the noise caused by airflow impact. At the same time, the existence of the ventilation channel 151 can also increase the static pressure of the air inlet to a certain extent, so that the mixed-flow impeller 120 can more stably push the airflow during operation, further improving the overall performance of the fan.

[0059] In the working scenario of the centrifugal impeller 120, the centrifugal impeller 120 mainly relies on centrifugal force to throw out the airflow, and the ventilation channel 151 can ensure that the entering airflow is uniformly distributed around the centrifugal impeller 120, avoiding unbalanced operation of the impeller 120 due to uneven air inlet, thereby reducing the noise caused by vibration of the impeller 120. In addition, the ventilation channel 151 can also guide the airflow to enter the centrifugal impeller 120 at a suitable angle, improve the acceleration effect of the centrifugal impeller 120 on the airflow, and improve the air outlet efficiency of the fan.

[0060] According to an embodiment provided by the present application, as shown in Figures 4-5 The first baffle plates 138 are arranged around the air outlet 132. The first baffle plates 138 can be arranged on the outer periphery of the front shell 110 or the inner wall of the rear shell 130. The first baffle plates 138 divide the air outlet 132 into a plurality of air outlet channels 1321.

[0061] It should be noted that the arrangement of the first baffle plates 138 around the air outlet 132 significantly optimizes the performance of the fan. The first baffle plates 138, whether arranged on the outer periphery of the front shell 110 or the inner wall of the rear shell 130, can effectively divide the air outlet 132 into a plurality of air outlet channels 1321.

[0062] Further, the design of the plurality of air outlet channels 1321 makes the airflow more orderly when flowing out of the fan. When the impeller 120 pushes the airflow to flow towards the air outlet 132, the first baffle plates 138 can finely guide and constrain the airflow. The airflow is stably discharged through each air outlet channel 1321, avoiding disordered diffusion of the airflow at the air outlet. In combination with the first air guide part 112 and the second air guide part 133, the overall airflow stability of the fan is further improved, and the noise generated by airflow turbulence is reduced.

[0063] In addition, high-speed airflow is prone to strong turbulence and noise. The presence of the first baffle plates 138 divides the high-speed airflow into a plurality of relatively stable airflows, which flow out of different air outlet channels 1321, effectively reducing the mutual interference and collision between the airflows, thereby reducing the additional noise generated by airflow turbulence. At the same time, the first baffle plates 138 can also change the flow direction and speed distribution of the airflow, making the wind blown by the fan more uniform and improving the user experience.

[0064] Further, the first baffle plates 138 cooperate with the first sound absorption cavity 114 and the second sound absorption cavity 135. When noise propagates to the air outlet 132, the first baffle plates 138 can reflect and block part of the noise, causing the noise to be reflected multiple times within the air outlet channel 1321, prolonging the propagation path of the noise inside the fan and increasing the opportunity for noise to be absorbed. The absorption effect of the fan on different frequency noises is further improved, and the noise level can be effectively reduced even at high speed, creating a quiet and comfortable use environment for users.

[0065] In addition, the design of the plurality of air outlet channels 1321 can also be adjusted according to different use requirements. For example, in some scenarios with special requirements for the air outlet direction, the angle and layout of the first baffle plates 138 can be adjusted to change the direction of the air outlet channel 1321, achieving directional air outlet and meeting diversified use scenarios.

[0066] According to an embodiment provided by the present application, as shown in Figure 11 The auxiliary shell 140 is provided with a plurality of second partitions 141, which are arranged on the auxiliary shell 140 and divide the third sound absorption cavity 137 into a plurality of sound absorption sub-cavities.

[0067] It should be noted that further, the third sound absorption cavity 137 has a plurality of partitions inside, which are the second partitions 141, and the second partitions 141 divide the third sound absorption cavity 137 into more cavities, further enhancing the noise reduction performance of the mixed flow impeller 120 fan. When the fan operates to generate noise, part of the noise will propagate to the third sound absorption cavity 137, and the noise will be reflected in the third sound absorption cavity 137, and the sound energy will be gradually consumed, thereby effectively reducing the amount of noise propagating outward. In other embodiments, the inside of the second sound absorption cavity 135 can also have a plurality of partitions like the third sound absorption cavity 137.

[0068] According to an embodiment provided by the present application, as shown in Figures 6-9 The bottom wall of the front shell 110 is also provided with a plurality of sound absorption holes 115, which are uniformly distributed on the bottom wall of the front shell 110 and communicate with the accommodating cavity 111.

[0069] According to an embodiment provided by the present application, the sound absorption cotton 160 is located outside the front shell 110 and in contact with the bottom wall of the front shell 110, and one end of the sound absorption hole 115 communicates with the sound absorption cotton 160.

[0070] It should be noted that the sound absorption cotton 160 can be made of a variety of materials. In the organic fiber sound absorption material, cotton and hemp fibers can effectively capture sound waves due to their natural fiber structure; wooden fiberboards hinder sound propagation due to their tight arrangement of wooden fibers. In inorganic fiber sound absorption materials, rock wool and glass wool have the characteristics of porous and interwoven fibers, which have significant sound absorption and scattering effects. In the foam plastic sound absorption material, polyurethane foam and polyester foam use unique cell structure to reflect and attenuate sound waves. The metal fibers of the metal fiber sound absorption material absorb sound energy by their own physical properties. In addition, rubber materials, diatomaceous mud, sound absorption paint, etc. also effectively absorb, isolate or weaken sound based on their different physical structures and chemical properties to achieve the purpose of noise reduction.

[0071] By setting the sound absorption hole 115 and the sound absorption cotton 160, the noise reduction effect of the bladeless fan is further enhanced. The sound absorption hole 115 allows sound waves to enter a specific space, and the sound absorption cotton 160 plays a role in converting or blocking sound energy, thereby providing users with a more comfortable user experience.

[0072] It is worth noting that in other embodiments, to comprehensively improve the noise reduction effect, noise reduction structures can also be set in the air intake area and the air outlet area. The noise reduction structure in the air intake area can process the noise generated when the airflow enters, while the noise reduction structure in the air outlet area can further reduce the noise carried by the airflow when the fan finally exhausts the air. By working together from both ends of the fan operation, a quiet environment is created for the user.

[0073] Furthermore, it should be noted that the central portion of the front housing 110 is recessed rearward, thereby forming a negative pressure zone. The air flowing out from the air outlet 132 flows forward and inward through the inner surface of the front housing 110, thus allowing the user to be exposed to a large area and a large volume of concentrated airflow.

[0074] It should be understood that in this embodiment, the central portion of the face is recessed backward, but in other embodiments, the face may be convex forward, or it may be flat. The flow-gathering effect of a convex face is greater than that of a flat face, and the flow-gathering effect of a flat face is greater than that of a recessed face. Different facial shapes can be set according to the desired flow-gathering effect.

[0075] According to one embodiment provided in this application, the fan involved in this application can be a handheld fan, a desktop fan, or a floor fan.

[0076] According to one embodiment provided in this application, the impeller 120 involved in this application can be a centrifugal impeller 120 or a mixed-flow impeller 120.

[0077] It should be noted that the blades of the mixed-flow impeller 120 are connected to the radial outer side of the hub at intervals. The hub is arranged to increase radially from back to front, and the outer surface of the hub is slightly concave towards the central shaft. That is, the slope of the outer surface of the hub gradually increases from back to front, thereby enhancing the effect of wind gathering and guiding.

[0078] Furthermore, it should be noted that the axial projections of the leading and trailing edges of each blade do not overlap. This means that as the blade extends from the trailing edge to the leading edge, the leading edge undergoes deformation and twisting relative to the trailing edge. The root, tip, leading edge, and trailing edge are roughly trapezoidal, and the angle between the trailing edge and tip is opposite to the angle between the leading edge and root. Moreover, viewed from back to front, the axial projections of adjacent blades overlap, which is beneficial for enhancing wind pressure.

[0079] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A fan, characterized by, Comprising: a front shell (110) having a receiving cavity (111); an impeller (120) located in the receiving cavity (111); a rear shell (130) covering the front shell (110), the rear shell (130) having an air inlet (131), at least part of the rear shell (130) surrounding part of the outer periphery of the front shell (110), and the rear shell (130) and the front shell (110) forming an air outlet (132) therebetween; part of the inner wall of the front shell (110) protruding to form a first air guide portion (112), and the edge of the front shell (110) bending towards the receiving cavity (111) to form a first bending portion (113), and the first air guide portion (112) and the first bending portion (113) forming a first sound absorption cavity (114) therebetween.

2. The fan of claim 1, wherein, One end of the rear shell (130) extends into the receiving cavity (111) of the front shell (110); part of the inner wall of the rear shell (130) protruding to form a second air guide portion (133), and the edge of the end of the rear shell (130) extending into the receiving cavity (111) bending towards the inner wall of the front shell (110) to form a second bending portion (134), and the second air guide portion (133) and the second bending portion (134) forming a second sound absorption cavity (135) therebetween.

3. The fan of claim 1, wherein, Further comprising: an auxiliary shell (140), one end of the rear shell (130) extending into the receiving cavity (111) of the front shell (110), the auxiliary shell (140) being sleeved on the end of the rear shell (130) extending into the receiving cavity (111), and the auxiliary shell (140) having a spacing with the receiving cavity (111); part of the inner wall of the rear shell (130) protruding to form a third air guide portion (136), and the auxiliary shell (140) and the third air guide portion (136) forming a third sound absorption cavity (137) therebetween.

4. The fan according to any one of claims 1 to 3, wherein: the air inlet (131) is located at the central part of the rear shell (130), and the impeller (120) is at least partially located at the air inlet (131); the fan further comprises: a rear cover body (150) covering the air inlet (131) of the rear shell (130), and the rear cover body (150) having a gap with the rear shell (130), the gap forming a ventilation channel (151) connected with the air inlet (131).

5. The fan of any one of claims 1 to 3, wherein, a plurality of first partitions (138) are arranged around the air outlet (132), and / or a plurality of first partitions (138) are arranged around the outer periphery of the front shell (110), And / or the rear shell (130) is surrounded by a plurality of first partitions (138), and the first partitions (138) divide the air outlet (132) into a plurality of air outlet channels (1321).

6. The fan of claim 3, wherein, The auxiliary shell (140) is provided with a plurality of second partitions (141), the second partitions (141) are surrounded by the auxiliary shell (140), and the second partitions (141) divide the third sound absorption cavity (137) into a plurality of sound absorption sub-cavities.

7. The fan of any one of claims 1 to 3, wherein, A plurality of sound absorption holes (115) are also formed in the bottom wall of the front shell (110), and the sound absorption holes (115) are uniformly distributed on the bottom wall of the front shell (110), and the sound absorption holes (115) are in communication with the containing cavity (111).

8. The fan of claim 7, wherein, It also includes sound absorption cotton (160), the sound absorption cotton (160) is located on the outside of the front shell (110) and is in contact with the bottom wall of the front shell (110), and one end of the sound absorption hole (115) is in communication with the sound absorption cotton (160).

9. The fan of any one of claims 1 to 3, wherein, The fan is a handheld fan, a desktop fan or a floor fan.

10. The fan of any one of claims 1 to 3, wherein, The impeller (120) is a centrifugal impeller (120) or a mixed flow impeller (120).

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