Silencing and noise reduction device and atomization equipment

Abstract

The application provides a silencing and noise reduction device and an atomization equipment. The atomization equipment comprises the silencing and noise reduction device. The silencing and noise reduction device is arranged in the atomization equipment and between two air channels. A throttling air channel is connected with the two air channels. The minimum cross-sectional area of the two air channels is greater than the maximum cross-sectional area of the throttling air channel. The silencing and noise reduction device is provided with a throttling air channel penetrating through the top and bottom thereof. The throttling air channel comprises an intermediate air flow channel, an expansion cavity connected with the end of the intermediate air flow channel, and a straight-through air channel connected with the end of the expansion cavity away from the intermediate air flow channel. The minimum cross-sectional area of the expansion cavity is greater than the cross-sectional area of the intermediate air flow channel. The silencing and noise reduction device can effectively reduce the maximum air flow noise at the throttling air channel, so that the user is free from the air flow noise and the comfort of the user's smoking experience is improved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of electronic atomization equipment, and particularly relates to a noise reduction device and an atomization equipment. BACKGROUND

[0002] In the related art, the number of structural components of the atomization device is large, the airway formed by each structural component is complex in shape, and the cross-sectional shape and size of the airway vary. Non-circular smooth transition of the airway, misplacement of the airway, corners, and small hole throttling may all generate airflow noise when a user smokes, and excessive airflow noise may affect the comfort of the user's smoking experience. SUMMARY

[0003] The technical purpose of the present application is to provide a noise reduction device and an atomization equipment, which aims to reduce the maximum airflow noise in the atomization equipment and reduce the noise impact when a user smokes, thereby improving the comfort of the user's smoking experience.

[0004] To solve the above technical problems, the present application is implemented as follows: a noise reduction device is provided, which is provided with a throttling airway penetrating through the top and bottom thereof, the throttling airway comprising a middle airflow channel, an expansion cavity connected to the end of the middle airflow channel, and a straight-through airway connected to the end of the expansion cavity away from the middle airflow channel, and the minimum cross-sectional area of the expansion cavity is greater than the cross-sectional area of the middle airflow channel.

[0005] Further, the middle airflow channel is vertically or obliquely arranged, the bottom end and the top end of the middle airflow channel are both connected to one expansion cavity and one straight-through airway, and the two straight-through airways are respectively connected to the bottom space and the top space of the noise reduction device.

[0006] Further, the cross-sectional area of the straight-through airway is greater than the cross-sectional area of the middle airflow channel, or / and the cross-sectional area of the straight-through airway is smaller than the cross-sectional area of the expansion cavity.

[0007] Further, the noise reduction device comprises a flow uniformizing plate covering the end of the expansion cavity away from the middle airflow channel, the straight-through airway comprises at least two flow holes penetrating through the flow uniformizing plate, and the sum of the cross-sectional areas of the at least two flow holes is greater than the cross-sectional area of the middle airflow channel.

[0008] Further, the expansion cavity covers the end of the middle airflow channel.

[0009] Further, the expansion cavity comprises a main cavity body covering the end of the middle airflow channel and extending radially outward, and a secondary cavity body connected to the main cavity body and extending axially.

[0010] Further, the auxiliary cavity at least partially overlaps the intermediate airflow passage in the radial direction of the intermediate airflow passage.

[0011] Further, the auxiliary cavity is annular and surrounds the outside of the intermediate airflow passage; or,

[0012] The auxiliary cavity comprises at least two sub-cavities which are arranged at intervals and surround the outside of the intermediate airflow passage.

[0013] Further, the end of the straight-through air passage away from the expansion cavity is covered with a flow uniformizing cover, a flow uniformizing cavity is formed in the flow uniformizing cover, and at least two flow uniformizing holes are formed in the flow uniformizing cover.

[0014] Further, the sum of the cross-sectional areas of the at least two flow uniformizing holes is greater than the cross-sectional area of the intermediate airflow passage.

[0015] Further, the flow uniformizing cover comprises a side wall surrounding the outside of the straight-through air passage and an end cover covering the end of the side wall away from the straight-through air passage, and the flow uniformizing holes are arranged in the side wall.

[0016] Further, the flow uniformizing holes are arranged at equal intervals around the side wall, and the flow uniformizing holes are arranged at equal intervals along the axial direction of the side wall.

[0017] Further, the cross-sectional shape of the intermediate airflow passage is the same as the cross-sectional shape of the expansion cavity.

[0018] Further, the cross-sectional shape of the expansion cavity is a central symmetric figure or an axial symmetric figure.

[0019] Further, the cross-sectional shape of the expansion cavity comprises any one of a circle, an ellipse, and a regular polygon.

[0020] Further, the noise reduction device comprises a throttling body and a noise reduction member embedded in the throttling body; wherein,

[0021] The intermediate airflow passage, the expansion cavity, and the straight-through air passage are formed in the noise reduction member; or the intermediate airflow passage is formed in the noise reduction member, the expansion cavity is formed by the noise reduction member and the throttling body, and the straight-through air passage is formed in the throttling body.

[0022] Further, an atomizing device is provided, comprising the noise reduction device according to any one of the above, the inside of the atomizing device has two air passages, the noise reduction device is arranged in the atomizing device and between the two air passages, the throttling air passage connects the two air passages, and the minimum cross-sectional area of the two air passages is greater than the maximum cross-sectional area of the throttling air passage.

[0023] Compared with existing technologies, the noise reduction device and atomizing equipment of this invention have the following advantages:

[0024] The noise reduction device can be installed between the two air channels of the atomizing device. The two air channels are connected by a throttling air channel, which can be the air intake channel and the atomizing channel, respectively. Since the throttling air channel includes an intermediate airflow channel, an expansion chamber connected to the end of the intermediate airflow channel, and a straight air channel connected to the expansion chamber at the end opposite to the intermediate airflow channel, the minimum cross-sectional area of ​​the expansion chamber is larger than that of the intermediate airflow channel. In this way, during the user's inhalation, the airflow sound waves generated in the intermediate airflow channel directly enter the expansion chamber, causing the sound waves to be reflected in the expansion chamber and interfere with the airflow sound waves at the sound source, thereby reducing noise. This can effectively reduce the maximum airflow noise at the throttling air channel, thus freeing the user from the disturbance of airflow noise and improving the comfort of the user's inhalation experience. Attached Figure Description

[0025] Figure 1 This is a cross-sectional structural diagram of the atomizing device in an embodiment of the present invention;

[0026] Figure 2 The atomizing device of the noise reduction and silencing device of the present invention, implemented in the first manner, is in... Figure 1 Enlarged view of section A in the middle;

[0027] Figure 3 These are bottom views (left) and cross-sectional views (right) of the noise reduction component using the first implementation method in this embodiment of the invention.

[0028] Figure 4 These are top (top) and bottom (bottom) views of the noise reduction component using the second implementation method in this embodiment of the invention.

[0029] Figure 5 The atomizing device of the noise reduction and silencing device of this invention, implemented in the third way, is in... Figure 1 Enlarged view of section A in the middle;

[0030] Figure 6 These are bottom views (left) and cross-sectional views (right) of the noise reduction component using the third implementation method in this embodiment of the invention.

[0031] Figure 7 The atomizing device of the noise reduction and silencing device of this invention, implemented in the fourth way, is in... Figure 1 Enlarged view of section A in the middle;

[0032] Figure 8 This invention employs the fifth implementation method of the noise reduction and silencing device's atomization equipment. Figure 1 Enlarged view of section A in the middle;

[0033] Figure 9 is a top (down) view (left) and a sectional view (right) of the sound-attenuating and noise-reducing piece according to the fourth and fifth implementation manners in the embodiments of the present application.

[0034] In the drawings, the reference signs represent: 100, atomization device; 10, sound-attenuating and noise-reducing device; 20, air inlet channel; 30, atomization channel; 1, throttle matrix; 2, sound-attenuating and noise-reducing piece; 21, intermediate air flow channel; 22, expansion cavity; 23, straight-through air passage; 221, main cavity; 222, auxiliary cavity; 3, flow-equalizing plate; 4, flow-equalizing cover; 41, side wall; 42, end cover. DETAILED DESCRIPTION

[0035] The embodiments of the present application are described in detail below, examples of which are shown in the drawings, wherein the same or similar notations represent the same or similar elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary, and are intended to explain the present application, and cannot be understood as a limitation of the present application, and all other embodiments obtained by those skilled in the art based on the embodiments in the present application without creative labor fall within the scope of protection of the present application.

[0036] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "circumferential", "radial" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do 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 present application.

[0037] In addition, the terms "first", "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0038] The inventor obtains through a large number of practices and simulation experiments that: the place where the maximum airflow noise of the entire atomization equipment air passage occurs is probably the air passage throttling channel (the channel with the smallest cross-sectional area in the atomization equipment airflow passage) and the vicinity thereof, the main reason is that the air passage size is small at this place, the flow velocity in the narrow throttling channel is greatly increased during the user's smoking experience, the airflow turbulence, vortex intensity, pulsation intensity and frequency of the air passage pressure near the air passage are also increased, and in addition, the high-speed airflow rubs against the inner wall of the air passage to generate noise due to the viscosity of air. A real situation is that product research and development engineers or designers only pay attention to the size of the throttling channel and the flow area, and usually adopt the equal cross-section straight-through design, but ignore the noise reduction design of the throttling channel inlet and outlet. Therefore, the application provides a structure improvement at the throttling channel, so as to achieve a good noise reduction effect of the atomization equipment.

[0039] In the embodiment, in combination with Figures 1-9 , an atomization equipment 100 is provided, which comprises a noise reduction device 10, the inside of the atomization equipment 100 has two air passages, the noise reduction device 10 is arranged in the atomization equipment 100 and located between the two air passages, a throttling air passage connects the two air passages, and the minimum cross-sectional areas of the two air passages are both greater than the maximum cross-sectional area of the throttling air passage.

[0040] The noise reduction device 10 is provided with a throttling air passage penetrating through the top and the bottom thereof, the throttling air passage comprises a middle airflow passage 21, an expansion cavity 22 connected to the end of the middle airflow passage 21, and a straight-through air passage 23 connected to the end of the expansion cavity 22 away from the middle airflow passage 21, and the minimum cross-sectional area of the expansion cavity 22 is greater than the cross-sectional area of the middle airflow passage 21.

[0041] The noise reduction device 10 can be arranged between the two air passages of the atomization equipment 100, the two air passages are connected through the throttling air passage, and the two air passages can be an air inlet passage 20 and an atomization passage 30 respectively. Since the throttling air passage comprises the middle airflow passage 21, the expansion cavity 22 connected to the end of the middle airflow passage 21, and the straight-through air passage 23 connected to the end of the expansion cavity 22 away from the middle airflow passage 21, and the minimum cross-sectional area of the expansion cavity 22 is greater than the cross-sectional area of the middle airflow passage 21, in this way, the airflow sound wave generated in the middle airflow passage 21 directly enters the expansion cavity 22 during the user's smoking process, so that the sound wave is reflected in the expansion cavity 22 and interferes with the airflow sound wave at the sound source to reduce the noise, which can effectively reduce the maximum airflow noise at the throttling air passage, so as to prevent the user from being disturbed by the airflow noise and improve the comfort of the user's smoking experience.

[0042] Further, the expansion ratio of the throttling air passage is greater than or equal to 5, and the expansion ratio is the ratio of the cross-sectional area of the throttling air passage at the expansion chamber 22 to the cross-sectional area at the intermediate air flow passage 21. The expansion ratio of the throttling air passage can be set to be between 5 and 10, and the noise reduction effect is optimal.

[0043] Further, the height of the expansion chamber 22 is an odd multiple of 1 / 4 of the wavelength of the air flow sound wave, and the height of the expansion chamber 22 is the distance between the highest point of the top wall and the lowest point of the bottom wall of the expansion chamber 22 in the vertical direction. This arrangement achieves good noise reduction effect.

[0044] Further, in combination with Figure 2 , 3 , 5, 7, 8, the noise reduction device 10 comprises a throttling body 1 and a noise reduction piece 2 embedded in the throttling body 1, wherein the intermediate air flow passage 21, the expansion chamber 22 and the straight-through air passage 23 are formed in the noise reduction piece 2. Specifically, the bottom side or the top side of the throttling body 1 can be provided with a mounting groove and a through port communicating with the mounting groove, and the noise reduction piece 2 is embedded in the mounting groove. The intermediate air flow passage 21 and the expansion chamber 22 communicating with one end of the intermediate air flow passage 21 are formed in the middle of the noise reduction piece 2, and the straight-through air passage 23 communicating with the expansion chamber 22 is formed at the end of the noise reduction piece 2. The shape and size of the straight-through air passage 23 can be the same as the through port, so that when the noise reduction piece 2 is installed in the mounting groove, the straight-through air passage 23 is aligned with the through port. In this way, the integrity of the throttling air passage is better, the size and position are more accurate, and the installation is convenient and fast.

[0045] In some embodiments, in combination with Figure 4 , the intermediate air flow passage 21 can be formed in the noise reduction piece 2, the expansion chamber 22 can be formed by the noise reduction piece 2 and the throttling body 1, and the straight-through air passage 23 can be formed in the throttling body 1. Specifically, the bottom side or the top side of the throttling body 1 can be provided with a mounting groove and a straight-through air passage 23 communicating with the mounting groove, and the noise reduction piece 2 is embedded in the mounting groove and fixed with the throttling body 1. The intermediate air flow passage 21 is formed in the noise reduction piece 2 and penetrates the bottom and the top of the noise reduction piece 2. There is a gap between the end of the noise reduction piece 2 and the groove bottom of the mounting groove, so that the end surface of the noise reduction piece 2 and the mounting groove form the expansion chamber 22, and the expansion chamber 22 communicates with the straight-through passage. In this way, only the intermediate air flow passage 21 needs to be formed on the noise reduction piece 2 when the noise reduction piece 2 is processed, the noise reduction piece 2 is convenient and fast to process, and the material cost is low. The process of installing the noise reduction piece 2 into the mounting groove is simple, which greatly simplifies the processing and installation process, and the cost is lower.

[0046] It should be understood that the specific structure of the atomizing device 100 mentioned in the embodiment is not limited, as long as the atomizing device 100 has an air inlet channel 20 and an atomizing channel 30, and the throttle body 1 can be any component or part of any component in the atomizing device 100, as long as it is arranged between the air inlet channel 20 and the atomizing channel 30, so that the two ends of the throttle air passage are respectively communicated with the air inlet channel 20 and the atomizing channel 30. In other embodiments, the noise reduction lining can also be arranged at other positions, as long as it is between two gas flow channels, so the throttle body 1 can be an independent component embedded in the atomizing device 100, or a base of an atomizer in the atomizing device 100, or a part of a battery rod of the atomizing device 100.

[0047] Further, the intermediate airflow channel 21 is vertically or obliquely arranged, and the bottom end and the top end of the intermediate airflow channel 21 are respectively connected with an expansion cavity 22 and a straight air passage 23, and the two straight air passages 23 are respectively communicated with the bottom space and the top space of the noise reduction device 10. Specifically, in the embodiment, the intermediate airflow channel 21 is vertically arranged, that is, the axial direction of the intermediate airflow channel 21 is parallel to the axial direction of the atomizing device 100, and the two ends of the intermediate airflow channel 21 are connected with the expansion cavities 22. In this way, during the suction process, the airflow will first pass through the expansion cavities 22 before flowing into or out of the intermediate airflow channel 21, and the airflow can be mixed and buffered in the expansion cavities 22, so that the airflow flowing into the intermediate airflow channel 21 has more balanced flow rate everywhere, which can reduce noise. On the other hand, the noise generated by the airflow flowing through the intermediate airflow channel 21 will enter the expansion cavities 22 at both ends, and the sound waves will be reflected in the expansion cavities 22 at both ends and interfere with the airflow sound waves at the sound source to reduce noise, so the noise is not easy to be transmitted out of the throttle passage, and the noise reduction effect is good. In some embodiments, the expansion cavities 22 can be arranged only at the bottom end or the bottom end of the intermediate airflow channel 21, so that the noise reduction effect of the throttle air passage can also be achieved, but the noise reduction effect is slightly worse than that of the way of arranging the expansion cavities 22 at both ends of the intermediate airflow channel 21. In some embodiments, the intermediate airflow channel 21 can also be obliquely arranged, and the inclination angle thereof can be 45-90°.

[0048] Further, the cross-sectional area of the straight-through air passage 23 is greater than the cross-sectional area of the intermediate air flow passage 21; the cross-sectional area of the straight-through air passage 23 is less than the cross-sectional area of the expansion cavity 22. Specifically, in the axial direction of the intermediate air flow passage 21, the projection of the straight-through air passage 23 covers the intermediate air flow passage 21, so that in the process of air flow into the straight-through air passage 23, the air flow aligned with the intermediate air flow passage 21 can directly enter the intermediate air flow passage 21, more smoothly, and is not easy to produce noise, and for the turbulent air flow, it is easier to enter the expansion cavity 22 from the edge of the straight-through air passage 23 to realize rectification, and the noise generated by the turbulent flow can be reflected and interfered in the expansion cavity 22 to consume energy; in the process of air flow flowing out of the straight-through air passage 23 from the intermediate air flow passage 21, the air flow in the same direction as the axial direction of the intermediate air flow passage 21 is more likely to flow out of the straight-through air passage 23, and the air flow is not easy to be blocked, and is not easy to produce noise, and the air flow in the axial direction of the intermediate air flow passage 21 is more likely to flow into the expansion cavity 22 to realize rectification, and the noise generated is reflected and interfered in the expansion cavity 22 to consume energy. Through the implementation of the scheme, on the one hand, the rectification of the air flow can be realized, and the generation of noise can be reduced, on the other hand, the energy of the noise can be consumed through the expansion cavity 22, the noise reduction effect is good.

[0049] Further, the ratio between the cross-sectional area of the straight-through air passage 23 and the cross-sectional area of the intermediate air flow passage 21 can be 1.3-1.7, such as 1.4, 1.5, 1.6, etc. The ratio between the cross-sectional area of the straight-through air passage 23 and the cross-sectional area of the expansion cavity 22 can be 0.3-0.6, such as 0.4, 0.5, etc. The straight-through air passage 23, the intermediate air flow passage 21 and the expansion cavity 22 adopt such cross-sectional area setting scheme, which can achieve better noise reduction effect.

[0050] Further, the end edges of the straight-through air passage 23 located at the air inlet and the end edges of the straight-through air passage 23 located at the air outlet can be chamfered, preferably rounded, which can make the air flow into or out of the throttle air passage more smoothly, not easy to produce turbulent flow, and can reduce the generation of noise.

[0051] In some embodiments, in combination with Figure 5 and 6The muffling and noise reduction device 10 comprises a flow equalizing plate 3 covering one end of the expansion chamber 22 away from the intermediate airflow channel 21, and the straight-through air passage 23 comprises at least two flow holes penetrating through the flow equalizing plate 3, and the sum of the cross-sectional areas of the at least two flow holes is greater than the cross-sectional area of the intermediate airflow channel 21. Specifically, in the embodiment, the straight-through air passage 23 can comprise one flow hole arranged at the center of the flow equalizing plate 3 and four flow holes arranged around the center of the flow equalizing plate 3, and the sum of the cross-sectional areas of the five flow holes is greater than the sum of the cross-sectional areas of the intermediate airflow channel 21, and in the axial direction of the intermediate airflow channel 21, the projections of the five flow holes are at least partially located outside the intermediate airflow channel 21. By arranging the straight-through air passage 23 in the form of multiple flow holes, the airflow flowing into or out of the throttling air passage can be more moderate and stable, and noise is less likely to be generated. Moreover, through the arrangement form of the flow holes, the noise inside the throttling air passage is less likely to be transmitted to the outside, and the effect of isolating noise is better. It should be understood that the number and arrangement form of the flow holes are not limited, as long as they are balanced; the shape of the flow holes can also be adaptively arranged, and the shape of each flow hole can be arranged to be the same or at least two different, and the shape of the flow hole is preferably circular, of course, the shape of the flow hole can also be arranged to be square, rectangular, regular pentagonal, regular hexagonal, etc.

[0052] Further, the expansion chamber 22 covers the end of the intermediate airflow channel 21. Specifically, the extension direction of the intermediate airflow channel 21 passes through the expansion chamber 22, so that the airflow flowing into the intermediate airflow channel 21 and the airflow flowing out of the intermediate airflow channel 21 will all enter the expansion chamber 22 and will not be blocked, and turbulence is less likely to be generated, and turbulence is more likely to diffuse into the inner cavity of the expansion chamber 22 to achieve buffering and flow regulation.

[0053] Further, in combination with Figure 2 、 3, 9, the expansion cavity 22 includes a main cavity 221 covering the end of the intermediate airflow channel 21 and extending radially outward, and a secondary cavity 222 connected to the main cavity 221 and extending axially; the secondary cavity 222 at least partially overlaps in the radial direction of the intermediate airflow channel 21. The airflow turbulence and noise can pass through the main cavity 221 and propagate into the secondary cavity 222, achieving more reflection and interference, and the noise reduction effect is better; in addition, since the secondary cavity 222 at least partially overlaps in the radial direction of the intermediate airflow channel 21, that is, the intermediate airflow channel 21 and the secondary cavity 222 share a part of the cavity wall, and the intermediate airflow channel 21 and the secondary cavity 222 are located on both sides of the cavity wall, so that the gas in the intermediate airflow channel 21 and the gas in the secondary cavity 222 can be consumed through the cavity wall when vibrating, further improving the noise reduction effect. The expansion cavity 22 is equivalent to a soundproof cover, and the cover is arranged at both ends of the intermediate airflow channel 21, so that the noise can be reduced from the intermediate airflow channel 21, and the user's smoking experience is improved.

[0054] In some embodiments, in combination Figure 5 and 6 , the expansion cavity 22 can also only include the main cavity 221, and the shape of the main cavity 221 can be a cylinder or a polygonal prism. The expansion cavity 22 can also be other shapes of cavities, as long as the cross-sectional area of the expansion cavity 22 is greater than that of the intermediate airflow channel 21.

[0055] Further, the secondary cavity 222 is annular and surrounds the outside of the intermediate airflow channel 21; or the secondary cavity 222 includes at least two sub-cavities arranged at intervals and surrounding the outside of the intermediate airflow channel 21. In this embodiment, the secondary cavity 222 is a complete annular and surrounds the outside of the intermediate airflow channel 21, wherein the cross-sectional outer profiles of the intermediate airflow channel 21, the expansion cavity 22 and the straight-through air passage 23 are all circular, which is convenient for processing and the noise reduction and rectification effects are more balanced in the circumferential direction. In some embodiments, the secondary cavity 222 can also include two, three, four or the like sub-cavities arranged at intervals and surrounding the outside of the intermediate airflow channel 21, and each sub-cavity is arranged at an equal angle interval around the intermediate airflow channel 21; preferably, the number of sub-cavities is even, and each sub-cavity is symmetrically arranged, so that the vibration mechanical energy is more easily consumed when the noise drives the air vibration during propagation in the expansion cavity 22, thereby achieving a better noise reduction effect.

[0056] Further, the cross-sectional shape of the expansion cavity 22 is both a central symmetric figure and an axial symmetric figure. Such a setting can be more conducive to the vibration of the air in the expansion cavity 22 driven by the noise to consume mechanical energy, achieving a better noise reduction effect.

[0057] It should be understood that the cross-sectional outer profile shapes of the intermediate airflow channel 21, the expansion chamber 22 and the straight-through air passage 23 are all the same or at least two are different, and their shapes can be adjusted accordingly, for example, they can be selected from the following shapes: circular, oval, regular polygon, etc.

[0058] Further, in combination with Figures 7-9 In order to further improve the noise reduction effect, the end of the straight-through air passage 23 away from the expansion chamber 22 is covered with a flow equalization cover 4, a flow equalization cavity is formed in the flow equalization cover 4, and at least two flow equalization holes are provided in the flow equalization cover 4; the sum of the cross-sectional areas of the flow equalization holes in the flow equalization cover 4 is greater than the cross-sectional area of the intermediate airflow channel 21. Specifically, the flow equalization cover 4 includes a side wall 41 surrounding the straight-through air passage 23 and an end cover 42 covering the end of the side wall 41 away from the straight-through air passage 23, and the flow equalization holes are provided in the side wall 41. The cross-sectional shape of the side wall 41 is the same as that of the straight-through air passage 23, the inner wall surface of the flow equalization cavity is flush with the inner wall surface of the straight-through air passage 23, the flow equalization holes are arranged equidistantly around the side wall 41, the flow equalization holes are arranged equidistantly along the axial direction of the side wall 41, and the flow equalization holes are the same in shape and size. In this way, when the flow equalization cover 4 is arranged at the inflow end of the throttling air passage, the gas flows into the flow equalization cavity through the flow equalization holes, the flow equalization holes are uniformly arranged on the side wall 41, and the size of each flow equalization hole is small, so the gas flow entering from the flow equalization holes is small, the gas flow is more regular and stable, mixing in the flow equalization cavity is easy, the mixed gas flow is more balanced, and turbulence is less, which can further reduce the generation of noise, and the flow equalization cavity can also reflect and isolate noise, so the noise reduction effect is better. When the flow equalization cover 4 is arranged at the outflow end of the throttling air passage, the gas flows out from the flow equalization holes, the outflow gas flow is divided into multiple parts, and the flow of each part is small and more regular, which can effectively reduce the turbulence generated when the gas flows out, and noise is not easy to generate. Similarly, the flow equalization cavity can mix and buffer the gas flowing out from the corresponding straight-through air passage 23, and reflect and isolate noise, so the noise reduction effect is better.

[0059] It should be understood that the flow equalization cover 4 can be arranged only outside the straight-through air passage 23 at the top end of the noise reduction device 10, or only outside the straight-through air passage at the bottom end. In addition, the flow equalization cover 4 can also be arranged outside the straight-through air passage at the top end and the bottom end respectively. In the case where the flow equalization cover 4 is arranged at both ends of the throttling air passage, the noise reduction effect of the noise reduction device 10 is better than that of the noise reduction device 10 with the flow equalization cover 4 arranged at only one end.

[0060] The above description is only a preferred embodiment of the present application, and is not intended to limit the present application. Any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A noise reduction device, characterized in that, It is provided with a throttling air passage that runs through its top and bottom. The throttling air passage includes an intermediate airflow channel, an expansion cavity connected to one end of the intermediate airflow channel, and a straight air passage connected to one end of the expansion cavity that is away from the intermediate airflow channel. The minimum cross-sectional area of ​​the expansion cavity is larger than the cross-sectional area of ​​the intermediate airflow channel. The expansion cavity includes a main cavity that covers the end of the intermediate airflow channel and extends radially outward, and a secondary cavity that is connected to the main cavity and extends axially. The cross-sectional shape of the expansion cavity is both centrally symmetric and axially symmetric.

2. The noise reduction device according to claim 1, characterized in that, The intermediate airflow channel is set vertically or at an angle. The bottom and top ends of the intermediate airflow channel are connected to an expansion cavity and a straight air passage, respectively. The two straight air passages are connected to the bottom space and the top space of the noise reduction device.

3. The noise reduction device according to claim 1, characterized in that, The cross-sectional area of ​​the straight air passage is larger than the cross-sectional area of ​​the intermediate airflow passage; or / and the cross-sectional area of ​​the straight air passage is smaller than the cross-sectional area of ​​the expansion cavity.

4. The noise reduction device according to claim 1, characterized in that, The noise reduction device includes a flow equalization plate covering one end of the expansion cavity away from the intermediate airflow channel, and the straight air passage includes at least two flow holes penetrating the flow equalization plate, the sum of the cross-sectional areas of the at least two flow holes being greater than the cross-sectional area of ​​the intermediate airflow channel.

5. The noise reduction device according to claim 1, characterized in that, The secondary cavity at least partially overlaps with the intermediate airflow channel in the radial direction.

6. The noise reduction device according to claim 1, characterized in that, The secondary cavity is annular and surrounds the outside of the intermediate airflow channel; or, The sub-cavities include at least two sub-cavities that are spaced apart and surround the outside of the intermediate airflow channel.

7. The noise reduction device according to claim 1, characterized in that, The end of the straight air passage away from the expansion cavity is covered with a flow equalization hood, and a flow equalization cavity is formed inside the flow equalization hood. The flow equalization hood has at least two flow equalization holes.

8. The noise reduction device according to claim 7, characterized in that, The sum of the cross-sectional areas of the at least two flow equalization orifices is greater than the cross-sectional area of ​​the intermediate airflow channel.

9. The noise reduction device according to claim 8, characterized in that, The flow equalization hood includes a sidewall surrounding the straight air passage and an end cap covering the sidewall at the end away from the straight air passage, and the flow equalization holes are all disposed on the sidewall.

10. The noise reduction device according to claim 9, characterized in that, The flow equalization holes are arranged at equal intervals around the sidewall, and at equal intervals along the axial direction of the sidewall.

11. The noise reduction device according to any one of claims 1-10, characterized in that, The noise reduction device includes a throttling housing and a noise reduction component embedded in the throttling housing; wherein... The intermediate airflow channel, the expansion cavity, and the straight air passage are all formed within the noise reduction component; or, the intermediate airflow channel is formed within the noise reduction component, the expansion cavity is formed by the noise reduction component and the throttling body, and the straight air passage is opened in the throttling body.

12. An atomizing device, characterized in that, The device includes a noise reduction device as described in any one of claims 1-11, wherein the atomizing device has two air passages inside, the noise reduction device is disposed inside the atomizing device and located between the two air passages, the throttling air passage connects the two air passages, and the minimum cross-sectional area of ​​the two air passages is greater than the maximum cross-sectional area of ​​the throttling air passage.

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