Noise reduction structure and electronic atomization equipment

Abstract

The invention discloses a noise reduction and sound attenuation structure and electronic atomization equipment, and the noise reduction and sound attenuation structure comprises an air channel structure provided with a first fluid channel; the micro-jet system is provided with at least one second fluid channel, the second fluid channel is arranged on the periphery of the first fluid channel, the overall extending direction of the second fluid channel is consistent with the extending direction of the first fluid channel, the second fluid channel is provided with an air outlet port, the sum of the cross sectional areas of the air outlet ports of all the second fluid channels is S, the cross sectional area of the air outlet of the first fluid channel is A, and S is smaller than A. In the embodiment of the invention, the air flow in the second fluid channel flows out of the second channel to form the jet flow, and the jet flow can destroy a large-scale vortex structure caused by an unstable strong shear layer at the downstream of the first fluid channel, strengthen and accelerate the mixing with the tail jet flow flowing out of the first fluid channel, weaken the turbulence pulsation intensity, and improve the stability of the jet flow. Therefore, the generation of peak noise is suppressed.

Description

Technical Field

[0001] This application relates to the technical field of electronic atomization devices, and particularly relates to a noise reduction and silencing structure and an electronic atomization device. Background Art

[0002] In related technologies, the areas with relatively large airflow noise in electronic atomization devices are often the gaps with a relatively small cross-sectional area of the air passage (such as the gap of the TYPE-C female socket, the gap between the battery and the housing of the electronic atomization device) or the flow holes (such as the intake passage, the throttling passage - the suction resistance or flow control passage of the electronic atomization device). Among them, the throttling passage and its surrounding areas are probably the areas with the largest airflow noise distribution in the entire air passage of the electronic atomization device. Further analysis shows that the cross-sectional area of the throttling passage is small. During the suction experience, the flow velocity in the throttling passage increases greatly, and the turbulence intensity, eddy current intensity, pulsation intensity and frequency of the airflow near the related air passage also increase accordingly, thereby generating an airflow noise wave that can be perceived by the human body, and ultimately resulting in a decrease in the comfort and pleasure of the user's suction experience. Summary of the Invention

[0003] This application aims to solve at least one of the technical problems existing in the prior art. For this purpose, this application provides a noise reduction and silencing structure and an electronic atomization device, which can reduce the airflow noise of the electronic atomization device to optimize the usage experience.

[0004] The noise reduction and silencing structure of the embodiment of this application includes:

[0005] An airway structure having a first fluid passage;

[0006] A microspray system having at least one second fluid passage, the second fluid passage is arranged on the outer periphery of the first fluid passage, and the overall extension direction of the second fluid passage is the same as the extension direction of the first fluid passage. Among them, the second fluid passage has an air outlet port, and the sum of the cross-sectional areas of all the air outlet ports of the second fluid passages is S, and the cross-sectional area of the air outlet of the first fluid passage is A, satisfying: S < A.

[0007] Furthermore, the second fluid passage has an air inlet port, and the sum of the cross-sectional areas of all the air inlet ports of the second fluid passages is M, the first fluid passage has an air inlet, and the cross-sectional area of the air inlet is N, satisfying: M > N.

[0008] Furthermore, a flow guiding portion is arranged at the air inlet port, and the end of the flow guiding portion away from the airway structure extends obliquely in a direction away from the airway structure.

[0009] Furthermore, the number of the second fluid passages is two or more, and adjacent two second fluid passages are separated from each other.

[0010] Further, along the air flow direction in the second fluid channel, the cross-sectional area of the second fluid channel gradually decreases.

[0011] Further, the microspray system further includes a throttling structure disposed around the outer periphery of the airway structure. In the air flow direction, the length of the throttling structure is less than that of the airway structure, and at least a part of the second fluid channel is disposed on the throttling structure.

[0012] Further, the throttling structure is located between the air inlet port and the air outlet port of the second fluid channel and is relatively close to the air outlet port.

[0013] Further, the noise reduction and silencing structure further includes a protrusion. One end of the protrusion is connected to the outlet end of the airway structure, and the other end of the protrusion is a free end and extends in a direction away from the outlet end.

[0014] Further, the number of the protrusions is multiple, and the multiple protrusions are arranged at intervals along the circumferential direction of the first fluid channel, so that the outlet end of the airway structure presents a structure with undulations.

[0015] Further, the protrusion is a tooth-shaped structure, and the tooth-shaped structure includes a tooth root, a tooth top and a tooth profile surface, and the tooth profile surface is located between the tooth root and the tooth top.

[0016] Further, along the air flow direction in the first fluid channel, the cross-sectional area of the tooth-shaped structure gradually decreases; along the direction away from the axis of the first fluid channel, the tooth width of the tooth-shaped structure remains unchanged or gradually decreases.

[0017] Further, an intersection line is formed between the inner wall surface of the tooth-shaped structure and at least one of the tooth profile surface, the tooth top and the tooth root.

[0018] Further, there are two or more tooth-shaped structures, and any two tooth-shaped structures are the same or different.

[0019] Further, the cross-section of the tooth-shaped structure along the circumferential direction of the first fluid channel is one of a sawtooth shape, a petal shape or a mathematical function waveform diagram.

[0020] An electronic atomization device according to another embodiment of the present application includes the noise reduction and silencing structure as described above, wherein

[0021] the electronic atomization device has an air inlet channel and an atomization channel, and the noise reduction and silencing structure is disposed in the air inlet channel or the atomization channel; or, the electronic atomization device further has a throttling channel, and the noise reduction and silencing structure is disposed in the throttling channel.

[0022] The noise reduction and silencing structure and the electronic atomization device according to the embodiments of the present application have at least the following beneficial effects: In the embodiments of the present application, airflows pass through both the first fluid channel and the second fluid channel. Among them, after the gas passes through the first fluid channel, an unstable strong shear layer is likely to be formed downstream, which easily leads to the generation of large-scale vortex structures; while the airflow in the second fluid channel forms a jet flow after flowing out of the second channel. The jet flow can destroy the large-scale vortex structures caused by the unstable strong shear layer downstream of the first fluid channel, strengthen and accelerate the mixing with the tail jet flow flowing out of the first fluid channel, weaken the turbulent pulsation intensity, and thus suppress the generation of peak noise. In this way, it is beneficial to improve the airflow noise of the electronic atomization device and helps to optimize the user experience.

[0023] Additional aspects and advantages of the present application will be given in part in the following description, become apparent in part from the following description, or be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The following further describes the present application with reference to the drawings and embodiments, where:

[0025] Figure 1 is a schematic structural diagram of an electronic atomization device according to an embodiment of the present application. Among them, in the figure, the noise reduction and silencing structure is not shown;

[0026] Figure 2 is Figure 1 the sectional structural diagram of A-A in

[0027] Figure 3 is a schematic structural diagram of a noise reduction and silencing structure according to an embodiment of the present application;

[0028] Figure 4 is Figure 3 the sectional structural diagram of C-C in

[0029] Figure 5 is Figure 4 the partial enlarged schematic diagram of part D in

[0030] Figure 6 is a schematic structural diagram of a noise reduction and silencing structure according to another embodiment of the present application from another perspective;

[0031] Figure 7 is Figure 6 the partial enlarged schematic diagram of E in

[0032] Figure 8 is a schematic structural diagram of a noise reduction and silencing structure according to another embodiment of the present application;

[0033] Figure 9 is Figure 8 the schematic structural diagram of the noise reduction and silencing structure from another perspective in

[0034] Figure 10 is Figure 8 a schematic structural diagram of another perspective of the noise reduction and silencing structure in

[0035] Figure 11 is Figure 10 a schematic cross-sectional structure diagram of F-F in

[0036] Figure 12 is Figure 11 a partially enlarged schematic diagram of part G in

[0037] Reference numerals:

[0038] 110, housing; 120, nozzle; 130, bottom cover; 131, air inlet hole; 140, power supply assembly; 150, atomization core; 160, atomization channel;

[0039] 200, noise reduction and silencing structure;

[0040] 210, silencing structure body; 220, air duct structure; 221, first fluid channel; 231, second fluid channel; 2311, air inlet port; 2312, air outlet port; 232, diversion part; 240, protrusion; 250, support part; 260, throttling structure. Detailed implementation manners

[0041] The embodiments of the present application are described in detail below. The examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions from beginning to end. The embodiments described below by referring to the accompanying drawings are exemplary and are only used to explain the present application and should not be construed as a limitation to the present application.

[0042] In the description of the present application, it should be understood that the orientation or positional relationship indicated by terms such as up, down, front, back, left, right, etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be construed as a limitation to the present application.

[0043] In the description of the present application, the meaning of several is more than one, and the meaning of multiple is more than two. Understandings such as greater than, less than, exceeding, etc. do not include the present number, and understandings such as above, below, within, etc. include the present number. If there is a description of first and second, it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or implicitly indicating the sequence relationship of the indicated technical features.

[0044] In the description of this application, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in this application based on the specific content of the technical solution.

[0045] In the description of the present application, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0046] See also Figures 1 to 3 The electronic atomization device includes a shell 110, a liquid storage tank, a power supply component 140, an atomization core 150 and a suction nozzle 120. The liquid storage tank is arranged in the shell 110, and the suction nozzle 120 is arranged at one end of the shell 110. The liquid storage tank stores atomized liquid. The power supply component 140 is used to provide power to the atomization core 150. The atomization core 150 generates an aerosol by conducting the atomized liquid in the liquid storage tank and heating it to atomize. Among them, the electronic atomization device has an atomization channel 320, and the atomization channel 320 is used to pass the aerosol generated by the atomization core 150 to the suction nozzle 120 for the user to inhale.

[0047] In this embodiment, the electronic atomization device also includes a bottom cover 130, which is arranged at one end of the shell 110 away from the nozzle 120. The bottom cover 130 is provided with an air inlet hole 131. External air can enter the electronic atomization device through the air inlet hole 131 and then flow through the atomization core 150, and together with the aerosol generated by the atomization core 150, it flows to the nozzle 120 through the atomization channel 320 for the user to inhale.

[0048] In some embodiments of the present application, the electronic atomization device has an air inlet channel, one end of which is connected to the air inlet hole and the other end is connected to the atomization channel. The air inlet channel is provided with a noise reduction and silencing structure 200 to reduce the airflow noise in the air inlet channel and improve the user experience.

[0049] In some embodiments of the present application, the electronic atomization device further has a throttling channel, and the throttling channel is provided with a noise reduction and silencing structure 200 to reduce the airflow noise in the throttling channel and improve the user experience.

[0050] Another aspect of the present application discloses a noise reduction and silencing structure 200, see Figures 3 to 5 As shown, the noise reduction and silencing structure 200 includes an air duct structure 220 and a micro-spray system.

[0051] Specifically, please continue to refer to Figures 3 to 5 , the airway structure 220 has a first fluid passage 221 for the mainstream air flow to pass through; the microspray system has at least one second fluid passage 231 disposed on the outer periphery of the first fluid passage 221, and the overall extension direction of the second fluid passage 231 is the same as the extension direction of the first fluid passage 221. Among them, the second fluid passage 231 has an air outlet port 2312, and the total cross-sectional area of the air outlet ports 2312 of all the second fluid passages 231 is S, and the cross-sectional area of the air outlet of the first fluid passage 221 is A, satisfying: S < A.

[0052] It should be noted that the X direction in the figure is the extension direction of the first fluid passage 221; alternatively, the X direction refers to the air flow direction in the first fluid passage 221.

[0053] Furthermore, the total cross-sectional area of the air outlet ports 2312 of all the second fluid passages 231 is S, and the cross-sectional area of the air outlet of the first fluid passage 221 is A, satisfying: the value of (A - S) / S is greater than 5%. In this way, it helps to further improve the noise reduction effect.

[0054] In the embodiment of the present application, both the first fluid passage 221 and the second fluid passage 231 are for air flow to pass through. Among them, the first fluid passage 221 is the mainstream passage of the air flow, and most of the air flow mainly passes through the first fluid passage 221; the second fluid passage 231 is an auxiliary passage, mainly used to form a jet flow to destroy the unstable strong shear layer formed downstream of the first fluid passage 221 to suppress the generation of peak noise, so as to achieve the purpose of reducing noise and flow loss.

[0055] In the embodiment of the present application, along the air flow direction, an unstable strong shear layer is easily formed downstream of the first fluid passage 221, which easily leads to the generation of large-scale vortex structures; and the air flow in the second fluid passage 231 will form a jet flow after flowing out of the second passage. The jet flow can destroy the large-scale vortex structures caused by the unstable strong shear layer downstream of the first fluid passage 221, strengthen and accelerate the mixing with the tail jet flow flowing out of the first fluid passage 221, and weaken the turbulent pulsation intensity, thereby suppressing the generation of peak noise. In this way, it is beneficial to improve the air flow noise of the electronic atomization device and helps to optimize the use experience.

[0056] In some embodiments of the present application, refer to Figure 4 and Figure 5 As shown, the second fluid passage 231 has an air inlet port 2311, and the total cross-sectional area of the air inlet ports 2311 of all the second fluid passages 231 is M, and the first fluid passage 221 has an air inlet, and the cross-sectional area of the air inlet is N, satisfying: M > N.

[0057] Specifically, the cross-sectional area of the intake ports 2311 of all the second fluid channels 231 is larger than that of the intake port of the first fluid channel 221, so that the total volume of gas flowing into each of the second fluid channels 231 within the same time period is larger than the volume of gas flowing into the first fluid channel 221. In this way, it helps the second fluid channels 231 to generate jet flows, thereby improving the destruction effect of the jet flows on the large-scale vortex structure formed downstream of the trailing edge of the first fluid channel 221, and further facilitating the improvement of the suppression effect on peak noise.

[0058] As one of the implementation manners, refer to Figures 4 to 7 As shown, the intake port 2311 has a guiding portion 232, and one end of the guiding portion 232 away from the airway structure 220 extends obliquely in a direction away from the airway structure 220, that is, the guiding portion 232 is arranged at an angle with the X direction. In this way, the cross-sectional area of the intake port 2311 of the second fluid channel 231 can be increased, which is beneficial to guiding more airflows into each of the second fluid channels 231, facilitating the generation of jet flows, and further improving the effect of suppressing peak noise.

[0059] It should be noted that the micro-jet system in the embodiments of the present application adopts the Venturi principle. In order to further improve the Venturi effect, the cross-sectional area of the intake port of the micro-jet system should be much larger than that of the outlet port, that is, the sum of the cross-sectional areas of all the intake ports 2311 of the second fluid channels 231 is M, and the sum of the cross-sectional areas of all the outlet ports 2312 of the second fluid channels 231 is S, satisfying that M is much larger than S. For example, S is less than 0.5M.

[0060] Furthermore, the sum of the cross-sectional areas of all the intake ports 2311 of the second fluid channels 231 is M, the first fluid channel 221 has an intake port, and the cross-sectional area of the intake port is N, and N is less than 0.5M. In this way, it helps to further improve the noise reduction effect.

[0061] In some embodiments of the present application, the number of the second fluid channels 231 is two or more, and adjacent two second fluid channels 231 are separated from each other. In this way, it helps to form jet flows, thereby improving the noise reduction effect.

[0062] In some embodiments of the present application, along the airflow direction in the second fluid channel 231, the cross-sectional area of the second fluid channel 231 gradually decreases. In this way, it helps to form jet flows and improve the intensity of the jet flows, thereby improving the noise reduction effect.

[0063] In some embodiments of the present application, refer to Figures 3 to 5As shown, the noise reduction and silencing structure 200 further includes a silencing structure body 210. The silencing structure body 210 has a mounting hole. The air duct structure 220 is disposed in the mounting hole through a support portion 250 and has a certain gap with the inner wall of the mounting hole. Among them, the gap between the outer wall of the air duct structure 220 and the inner wall of the mounting hole forms the aforementioned second fluid passage 231.

[0064] In one of the embodiments, see Figure 3 As shown, the support portion 250 divides the gap between the outer wall of the air duct structure 220 and the inner wall of the mounting hole to form a plurality of second fluid passages 231.

[0065] In some embodiments of the present application, see Figures 8 to 12 As shown, the microspray system further includes a throttling structure 260. The throttling structure 260 is disposed around the outer periphery of the air duct structure 220. In the flow direction of the air flow, the length of the throttling structure 260 is less than the length of the air duct structure 220. The second fluid passage 231 is at least partially disposed on the throttling structure 260. Specifically, the throttling structure 260 is disposed between the air duct structure 220 and the silencing structure body 210. The second fluid passage 231 includes a passage formed by the gap between the silencing structure body 210 and the outer wall of the air duct structure 220 and a passage disposed in the throttling structure 260. Among them, the cross-sectional area (i.e., the cross-sectional area) of the passage disposed in the throttling structure 260 is smaller than the passage formed by the gap between the silencing structure body 210 and the outer wall of the air duct structure 220. Thus, under the guiding action of the guiding portion 232, the air flow outside the intake port 2311 of the second fluid passage 231 can first enter the front section of the second fluid passage 231 (i.e., the passage between the air duct structure 220 and the inner wall of the mounting hole of the silencing structure body 210), and then pass through the second fluid passage 231 disposed in the throttling structure 260, which helps to form a jet flow and further improve the intensity of the jet flow, thereby improving the destruction effect on the vortex structure formed downstream of the trailing edge of the first fluid passage 221 and facilitating the suppression of the generation of peak air flow noise.

[0066] In some embodiments of the present application, see Figure 11 and Figure 12 , the throttling structure 260 is located between the intake port 2311 and the outlet port 2312 of the second fluid passage 231 and is relatively close to the outlet port 2312. Thus, the jet flow can fully intersect with the air flow in the first fluid passage 221, and the destruction effect on the vortex structure formed downstream of the trailing edge of the first fluid passage 221 can be improved, thereby improving the noise reduction and silencing effect.

[0067] In some embodiments of the present application, along the air flow direction (i.e., the X direction), the cross-sectional area (i.e., the cross-sectional area) of the second fluid passage 231 gradually decreases. In this way, the pulsation and kinetic energy loss of the air flow in the second fluid passage 231 can be reduced, which helps to improve the injection effect of the injection flow, and further improve the noise reduction effect.

[0068] In some embodiments of the present application, refer to Figures 3 to 5 As shown, the noise reduction and silencing structure 200 further includes a protrusion 240. One end of the protrusion 240 is connected to the outlet end of the air duct structure 220, and the other end of the protrusion 240 is a free end and extends in a direction away from the outlet end. Among them, Figure 4 the X direction in

[0069] is the air flow direction in the first fluid passage 221, and the extending direction of the free end of the protrusion 240 is the same as the air flow direction in the first fluid passage 221.

[0070] It should be noted that in the above embodiments, the second fluid passage 231 and the protrusion 240 cooperate with each other, that is, the jet flow and the jet flow formed by the micro-jet system cooperate to destroy the eddy current structure, which can further improve the noise reduction effect.

[0071] In some embodiments of the present application, refer to Figure 5 and Figure 12 As shown, the number of the protrusions 240 is multiple, and the multiple protrusions 240 are arranged at intervals along the circumferential direction of the first fluid passage 221, so that the outlet end of the air duct structure 220 presents a structure with undulating height. In this way, more jet flows can be formed in the circumferential direction of the first fluid passage 221, which is beneficial to improving the destruction effect of the jet flow on the vortex, and thus beneficial to improving the noise reduction effect.

[0072] In a traditional atomizer, when air flow ejects from the trailing edge through the first fluid passage 221, due to the separation of the laminar boundary layer at the trailing edge, the air flow detaches from the wall surface of the first fluid passage 221, generating a continuously shedding von Kármán vortex street. Its shedding frequency is consistent with the peak noise frequency of the air flow. Therefore, the shedding of the boundary layer von Kármán vortex street is one of the main reasons for the air flow noise. In this embodiment, a protrusion 240 is provided at the air outlet of the first fluid passage 221, and the vortex shedding at the trailing edge of the first fluid passage 221 is effectively suppressed. Specifically, an upward jet is generated at the root position of the protrusion 240, which destroys the vortex structure shed from the suction surface, strengthens the mixing between the wake and the mainstream, weakens the turbulent pulsation intensity, and thus suppresses the generation of peak noise, achieving the purpose of reducing air flow noise and flow loss.

[0073] In some embodiments of the present application, please continue to refer to Figure 5 and Figure 12 As shown, the protrusion 240 is a toothed structure, and the toothed structure includes a tooth root, a tooth tip, and a tooth profile surface, and the tooth profile surface is located between the tooth root and the tooth tip.

[0074] Specifically, the tooth root is closer to the air outlet of the first fluid passage 221 than the tooth tip. When the air flow flows out from the air outlet of the first fluid passage 221, the air flow passes through the tooth root, the tooth profile surface, and the tooth tip in sequence. During the process of the air flow passing through the tooth root, due to the pressure difference between the inner wall and the outer wall at the tooth root, a jet can be formed at the tooth root in the direction away from the air outlet of the first fluid passage 221. This jet can destroy the vortices shed from the suction surface and strengthen the mixing between the wake and the main air flow in the first fluid passage 221. In this way, it helps to weaken the pulsation intensity of the turbulence in the mainstream air flow, thereby suppressing the generation of peak noise.

[0075] It should be noted that the tooth root can be a line segment or a connecting portion connecting the roots of two adjacent protrusions 240; similarly, the tooth tip can be the intersection line of the two tooth profile surfaces of the same protrusion 240 or a connecting portion connecting the tooth profile surfaces on both sides of the same protrusion 240.

[0076] In some embodiments of the present application, there is a gap between the side of the tooth profile surface of the toothed structure close to the inner wall surface of the structure body and the tooth profile surface of another adjacent toothed structure. Specifically, the interval between two adjacent toothed structures is greater than the maximum width of the tooth width, and the two tooth profile surfaces of two adjacent toothed structures close to each other are connected by a connecting portion. In this way, the area or space of the tooth root can be made larger, so that the boundary line trajectory where the tooth root intersects with the inner wall of the first fluid passage 221 is longer. Further, the boundary line maintains a sharp feature rather than a smooth transition, which is beneficial to improving the jet effect at the tooth root, thereby improving the noise reduction effect.

[0077] It should be understood that the tooth width refers to the length of the protrusion 240 in the circumferential direction of the first fluid passage 221.

[0078] Among them, the connecting part can be a plane, a curved surface, or a surface formed by a combination of a plane and a curved surface, which is not limited herein.

[0079] Exemplarily, between two tooth profile surfaces that are close to each other in two adjacent tooth-like structures, they are connected by a plane, an arc surface, or a curved surface.

[0080] In some embodiments of the present application, on one side of the tooth profile surface of the tooth-like structure close to the inner wall surface of the structure body, it intersects with the tooth profile surface of another adjacent tooth-like structure. That is to say, the tooth profile surfaces of two adjacent tooth-like structures intersect, and the intersection line formed by the two tooth profile surfaces is the tooth root.

[0081] In some embodiments of the present application, refer to Figure 4 and Figure 5 As shown, along the air flow direction in the first fluid passage 221, the cross-sectional area of the tooth-like structure gradually decreases. In the figure, the X direction is the air flow direction in the first fluid passage 221; the cross-section of the tooth-like structure refers to the cross-section formed by the protrusion 240 and the plane perpendicular to the X direction. Along the X direction, the area where the air flow communicates with the outside gradually increases rather than changes sharply, which helps to reduce the pulsation intensity and frequency of the air flow pressure, is beneficial to reducing the air flow noise wave that can be perceived by the human body, and thus improves the comfort of the suction experience.

[0082] In some embodiments of the present application, along the direction away from the axis of the first fluid passage 221, the tooth width of the tooth-like structure remains unchanged or gradually decreases.

[0083] As one example, along the direction away from the axis of the first fluid passage 221, the tooth width of the tooth-like structure remains unchanged. That is to say, the tooth width on the side of the tooth-like structure close to the inner wall of the first fluid passage 221 is equal to the tooth width on the side of the tooth-like structure close to the outer wall.

[0084] As another example, along the direction away from the axis of the first fluid passage 221, the tooth width of the tooth-like structure gradually decreases. That is to say, the tooth width on the side of the tooth-like structure close to the inner wall of the airway structure 220 is greater than the tooth width on the side away from the inner wall of the airway structure 220.

[0085] In some embodiments of the present application, a intersection line is formed between the inner wall surface of the tooth-like structure and at least one of the tooth profile surface, the tooth top, and the tooth root. In this way, the position where the intersection line is formed does not guide the flowing air flow, which is beneficial to enabling the air flow close to the inner wall surface in the first fluid passage 221 to smoothly separate in sequence.

[0086] In some embodiments of the present application, refer to Figure 5 and Figure 12As shown, an intersection curve is formed between the inner wall surface of the tooth-shaped structure and the tooth profile surface. In other words, a sharp feature is maintained between the inner wall surface of the tooth-shaped structure and the tooth profile surface, rather than a smooth transition. Thus, the tooth profile surface of the tooth-shaped structure does not guide the flowing air, which is conducive to the smooth sequential shedding and separation of the air flow near the inner wall surface in the first fluid passage 221.

[0087] In some embodiments of the present application, referring to Figure 12 As shown, an intersection curve is formed between the inner wall surface of the tooth-shaped structure and the tooth tip. In other words, a sharp feature is maintained between the inner wall surface of the tooth-shaped structure and the tooth tip, rather than a smooth transition. Thus, the tooth tip of the tooth-shaped structure does not guide the flowing air, which is conducive to the smooth sequential shedding and separation of the air flow near the inner wall surface in the first fluid passage 221.

[0088] In some embodiments of the present application, referring to Figure 12 As shown, an intersection curve is formed between the inner wall surface of the tooth-shaped structure and the tooth root. In other words, a sharp feature is maintained between the inner wall surface of the tooth-shaped structure and the tooth root, rather than a smooth transition. Thus, the tooth root of the tooth-shaped structure does not guide the flowing air, which is conducive to the smooth sequential shedding and separation of the air flow near the inner wall surface in the first fluid passage 221.

[0089] In some embodiments of the present application, there are two or more tooth-shaped structures, and any two tooth-shaped structures may be the same or different.

[0090] Exemplarily, in some embodiments, the noise reduction and sound absorption structure 200 has a plurality of protrusions 240 (i.e., tooth-shaped structures) and the structure of each protrusion 240 is the same; in other embodiments, the noise reduction and sound absorption structure 200 has a plurality of protrusions 240, but the structures of each protrusion 240 are different from each other; in still other embodiments, the noise reduction and sound absorption structure 200 has a plurality of protrusions 240, the structures of some protrusions 240 are the same, and the structures of some other protrusions 240 are different from the former.

[0091] In some embodiments of the present application, the cross-section of the tooth-shaped structure along the circumferential direction of the first flow channel is one of a sawtooth shape, a petal shape, or a mathematical function waveform diagram.

[0092] It should be noted that for the case where the noise reduction and sound absorption structure 200 has a plurality of protrusions 240, the tooth-shaped structures in the noise reduction and sound absorption structure 200 can be one of straight teeth, helical teeth, spiral teeth, or bevel teeth, or a combination of more than one, that is, the tooth-shaped structures in the noise reduction and sound absorption structure 200 include two or more shapes of straight teeth, helical teeth, spiral teeth, or bevel teeth.

[0093] In some embodiments of the present application, the cross-section of the tooth-shaped structure along the circumferential direction of the first fluid structure is one of a sawtooth shape, a petal shape, or a mathematical function waveform diagram.

[0094] As an example, the cross-section of the toothed structure along the circumferential direction of the first fluid passage 221 is serrated. Further, the boundary line of one side of the toothed structure can be parallel to the air flow direction in the first fluid passage 221. Further, an intersection line is formed between the boundary line and the inner wall of the structure body, that is, the boundary line and the inner wall of the structure body maintain sharp features instead of smooth transitions.

[0095] As another example, the cross-section of the toothed structure along the circumferential direction is petal-shaped.

[0096] As yet another example, the contour trajectory of the cross-section of the toothed structure along the circumferential direction presents a mathematical function waveform, and the mathematical function includes but is not limited to sine function, cosine function, etc.

[0097] It should be understood that the first fluid passage 221 in the embodiment of the present application can specifically be an intake passage, a throttle passage, or other passages that need to control the flow rate or noise. In other words, the noise reduction and silencing structure 200 in the embodiment of the present application can specifically be arranged at the intake end, throttle position, or other positions that need to control the air flow rate or noise of the electronic atomization device.

[0098] The noise reduction and silencing structure 200 of the embodiment of the present application will be described in detail below through specific embodiments. It should be understood that the following embodiments are only exemplary descriptions and should not be construed as limitations on the noise reduction and silencing structure 200 of the embodiment of the present application.

[0099] In one embodiment, referring to Figures 3 to 7 , the noise reduction and silencing structure 200 includes an airway structure 220 and a microspray system. Among them, the first fluid passage 221 of the airway structure 220 is a throttle passage, and the trailing edge end of the airway structure 220 is a serrated protrusion 240; the inner wall of the protrusion 240 and the contour boundary line of the protrusion 240 maintain sharp features; a microspray system is arranged circumferentially on the outer wall of the airway structure 220, and the microspray system specifically includes 4 second fluid passages 231 with variable cross-sections. Among them, the total cross-sectional area at the intake port 2311 of the second fluid passage 231 is larger than the cross-sectional area at the intake port of the first fluid passage 221; the total cross-sectional area at the outlet port 2312 of the second fluid passage 231 is smaller than the cross-sectional area at the outlet port of the first fluid passage 221. When an air flow is generated in the first fluid passage 221, jet flows are generated in each of the second fluid passages 231 simultaneously, which can destroy the large-scale vortex structure caused by the unstable strong shear layer downstream of the trailing edge of the first fluid passage 221, strengthen and accelerate the mixing of the trailing jet flow, and weaken the turbulent pulsation intensity, thereby suppressing the generation of peak noise.

[0100] In the above embodiment, any two of the second fluid passages 231 are separated from each other, and the noise suppression effect of the microspray system is better compared with the case where the adjacent second fluid passages 231 are not separated.

[0101] In one embodiment, referring to Figures 8 to 12 , the noise reduction and silencing structure 200 includes an airway structure 220, a protrusion 240, and a microspray system. The protrusion 240 has a straight tooth structure; the inner wall of the protrusion 240 maintains a sharp feature at the intersection boundary line of the protrusion 240 features; one side of the outer wall of the airway structure 220 is a microspray system with circumferentially distributed circular through holes. Among them, the microspray system includes a plurality of second fluid channels 231. Along the airflow direction, the second fluid channels 231 include an air inlet port 2311, an intermediate section, and an air outlet port 2312. It should be noted that the microspray system is specifically N (N>1) second fluid channels 231 with variable cross-sections. The total cross-sectional area at the air inlet ports 2311 of all the second fluid channels 231 in the microspray system is larger than the cross-sectional area at the air inlet of the first fluid channel 221; the total cross-sectional area at the air outlet ports 2312 of all the second fluid channels 231 in the microspray system is smaller than the cross-sectional area at the air outlet of the first fluid channel 221. When an air current is generated in the first fluid channel 221, microjets are simultaneously generated in each of the second fluid channels 231, which can destroy the large-scale vortex structure caused by the unstable strong shear layer downstream of the trailing edge of the first fluid channel 221, strengthen and accelerate the mixing of the exhaust jet, weaken the turbulent pulsation intensity, and thus suppress the generation of peak noise.

[0102] In the above embodiment, any two second fluid channels 231 are separated from each other, and the cross-sectional area of each second fluid channel 231 gradually changes along the airflow direction. Compared with the situation where adjacent second fluid channels 231 are not separated or the cross-sectional area of the second fluid channel 231 remains fixed, the noise suppression effect of the microspray system is better. In the foregoing embodiment, the first fluid channel 221 may specifically be a flow-through hole, a throttle hole, or other through holes.

[0103] The embodiments of the present application have been described in detail above with reference to the drawings. However, the present application is not limited to the above embodiments. Within the knowledge scope of those of ordinary skill in the art to which the present application pertains, various changes can be made without departing from the purpose of the present application. In addition, without conflict, the embodiments of the present application and the features in the embodiments can be combined with each other.

Claims

1. A noise reduction and sound absorption structure, characterized in that, Comprising: An airway structure having a first fluid passage; A microspray system having at least one second fluid passage disposed on the outer periphery of the first fluid passage, the overall extension direction of the second fluid passage being the same as the extension direction of the first fluid passage. Wherein, the second fluid passage has an air outlet port, and the sum of the cross-sectional areas of all the air outlet ports of the second fluid passages is S, and the cross-sectional area of the air outlet of the first fluid passage is A, satisfying: S < A.

2. The noise reduction and silencing structure according to claim 1, wherein The second fluid passage has an air inlet port, and the sum of the cross-sectional areas of all the air inlet ports of the second fluid passages is M, and the first fluid passage has an air inlet, and the cross-sectional area of the air inlet is N, satisfying: M > N.

3. The noise reduction and silencing structure according to claim 2, characterized in that, A diversion portion is provided at the air inlet port, and one end of the diversion portion away from the airway structure extends obliquely away from the airway structure.

4. The noise reduction and silencing structure according to any one of claims 1 to 3, characterized in that, The number of the second fluid passages is two or more, and adjacent two of the second fluid passages are separated from each other.

5. The noise reduction and silencing structure according to any one of claims 1 to 3, characterized in that, Along the air flow direction in the second fluid passage, the cross-sectional area of the second fluid passage gradually decreases.

6. The noise reduction and silencing structure according to claim 2 or 3, characterized in that, The microspray system further includes a throttling structure disposed around the outer periphery of the airway structure. In the air flow direction, the length of the throttling structure is less than the length of the airway structure, and at least a part of the second fluid passage is disposed on the throttling structure.

7. The noise reduction and silencing structure according to claim 6, characterized in that, The throttling structure is located between the air inlet port and the air outlet port of the second fluid passage and is relatively close to the air outlet port.

8. The noise reduction and silencing structure according to claim 1, characterized in that, The noise reduction and silencing structure further includes a protrusion, one end of the protrusion is connected to the outlet end of the airway structure, and the other end of the protrusion is a free end and extends away from the outlet end.

9. The noise reduction and silencing structure according to claim 8, characterized in that, The number of the protrusions is multiple, and the multiple protrusions are spaced along the circumferential direction of the first fluid passage, so that the outlet end of the airway structure presents a structure with undulations.

10. The noise reduction and silencing structure according to claim 8 or 9, characterized in that, The protrusion is a tooth-like structure, and the tooth-like structure includes a tooth root, a tooth top, and a tooth profile surface, and the tooth profile surface is located between the tooth root and the tooth top.

11. The noise reduction and silencing structure according to claim 10, characterized in that, Along the air flow direction in the first fluid passage, the cross-sectional area of the tooth-like structure gradually decreases; along the direction away from the axis of the first fluid passage, the tooth width of the tooth-like structure remains unchanged or gradually decreases.

12. The noise reduction and silencing structure according to claim 10, characterized in that, A generatrix is formed between the inner wall surface of the tooth-like structure and at least one of the tooth profile surface, the tooth top, and the tooth root.

13. The noise reduction and silencing structure according to claim 12, characterized in that, There are two or more of the tooth-like structures, and any two of the tooth-like structures are the same or different.

14. The noise reduction and silencing structure according to claim 13, characterized in that, The cross-section of the tooth-like structure along the circumferential direction of the first fluid passage is one of a sawtooth shape, a petal shape, or a mathematical function waveform diagram.

15. An electronic atomization device, characterized in that, Comprising the noise reduction and silencing structure according to any one of claims 1 to 14, wherein The electronic atomization device has an air inlet passage and an atomization passage, and the noise reduction and silencing structure is disposed in the air inlet passage or the atomization passage; Or, The electronic atomization device further has a throttling passage, and the noise reduction and silencing structure is disposed in the throttling passage.

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