Atomizing nozzle and atomizing device

Abstract

The utility model is suitable for the technical field of atomizing devices, and provides an atomizing nozzle and an atomizing device. A liquid inlet channel, an airflow channel, a nozzle outlet and a negative pressure mixing cavity are formed in the atomizing nozzle. In the first direction, the upstream end of the negative pressure mixing cavity communicates with the liquid inlet channel and the airflow channel, the downstream end of the negative pressure mixing cavity communicates with the nozzle outlet, and the flow channel sectional area of the upstream end is larger than that of the downstream end. The airflow channel is used for being communicated with an air source and inputting airflow to the upstream end, so that a negative pressure environment is formed in the negative pressure mixing cavity, and the aerosol atomization matrix entering the negative pressure mixing cavity is atomized. The aerosol generating matrix is mixed with the high-speed airflow in the negative pressure mixing cavity, the aerosol generating matrix which is not fully atomized is mixed with the low-speed airflow again at the outlet of the nozzle, and the mixing strength of the atomizing nozzle on two-phase flow of the airflow is enhanced through two-time mixing, so that the airflow can fully cut the aerosol generating matrix; and the content of large liquid drops in the aerosol is reduced.

Description

TECHNICAL FIELD

[0001] The utility model belongs to atomization device technical field especially relates to a kind of atomization nozzle and atomization device. BACKGROUND

[0002] Atomization device is a kind of device that gasoloid atomization matrix gasification is formed into gas and / or cutting into several tiny droplets to form mist medium. In the related art, atomization device includes atomizer and atomization nozzle, atomization nozzle is the spray component in atomizer, airflow and the gasoloid generated matrix to be atomized all pass through atomization nozzle, airflow impact and cut gasoloid generated matrix, to atomize gasoloid generated matrix, form atomized glue and spray to atomization device outside.

[0003] However, the mixing intensity of gas-liquid two-phase flow of the atomization nozzle in the related art is low, and the airflow is difficult to fully cut the gasoloid generated matrix, so that the large droplet content in the aerosol is high, which affects the user's experience. UTILITY MODEL CONTENT

[0004] Therefore, the utility model provides an atomization nozzle and an atomization device to solve the technical problem of how to enhance the mixing intensity of gas-liquid two-phase flow of the atomization nozzle.

[0005] To solve the above problems, the technical scheme provided by the utility model embodiment is as follows:

[0006] The utility model embodiment provides an atomizer, the atomization nozzle is internally provided with: liquid inlet channel, for inputting gasoloid generated matrix; airflow channel, for airflow to flow along the first direction; nozzle outlet, for gasoloid to be guided out; negative pressure mixing cavity, along the first direction, the upstream end of the negative pressure mixing cavity is communicated with the liquid inlet channel and the airflow channel, the downstream end of the negative pressure mixing cavity is communicated with the nozzle outlet, the flow passage cross-sectional area of the upstream end is greater than the flow passage cross-sectional area of the downstream end; wherein, the airflow channel is used to communicate with gas source, and input airflow to the upstream end, so that the negative pressure mixing cavity forms a negative pressure environment, and atomizes the gasoloid atomization matrix entering the negative pressure mixing cavity.

[0007] In some embodiments, the inside of the atomization nozzle has a mixing part for forming the negative pressure mixing cavity, the inner wall of the mixing part is arranged around the first direction, and the diameter of the inner wall of the mixing part decreases along the first direction, and the upstream end and the downstream end are opposite ends of the mixing part.

[0008] In some embodiments, the flow passage diameter of the upstream end is greater than or equal to 1.2 mm and less than or equal to 1.5 mm.

[0009] In some embodiments, the flow passage diameter of the downstream end is greater than or equal to 0.7 mm and less than or equal to 1 mm.

[0010] In some embodiments, the distance from the upstream end to the downstream end is greater than or equal to 0.3 mm and less than or equal to 0.5 mm.

[0011] In some embodiments, the atomizing nozzle comprises: an outer shell having a top end with the nozzle outlet; an inner shell having the liquid inlet channel inside, the inner shell being disposed in the outer shell and spaced apart from a portion of the outer shell; the airflow channel being formed between the inner shell and the outer shell in a radial direction; the top end of the inner shell being spaced apart from the top end of the outer shell to form the negative pressure mixing cavity in the first direction; wherein the outer shell is provided with an air inlet channel communicating the airflow channel and the air source.

[0012] In some embodiments, the outer shell comprises a connected airflow section and a mixing section, the airflow section being spaced apart from the inner shell, and the mixing section being abutted with the inner shell, and the mixing part being formed in the mixing section; wherein a portion of the inner shell abutted with the mixing section is provided with a groove, and the groove and the gap between the airflow section and the inner shell in the radial direction jointly form the airflow channel.

[0013] In some embodiments, the inner wall diameter of the mixing section decreases in the first direction; and / or, the cross-sectional area of the flow passage of the groove decreases in the direction of airflow flowing in the groove.

[0014] In some embodiments, the top end of the inner shell is provided with a converging part, and the converging part is provided with a through hole communicating the liquid inlet channel and the groove.

[0015] The utility model embodiment further provides an atomizing device, comprising the above-mentioned atomizing nozzle, the atomizing device further comprises an atomizer, which has a liquid storage bin for accommodating aerosol atomization substrate inside, the liquid storage bin is communicated with the liquid inlet channel, and the liquid inlet channel inputs the aerosol atomization substrate; a gas pump is communicated with the atomizing nozzle to input airflow; a power supply is used for supplying power to the gas pump.

[0016] The utility model discloses an atomizing nozzle and atomizing device provided by an embodiment, and the atomizing device comprises the atomizing nozzle, the inside of the atomizing nozzle is provided with liquid inlet channel, airflow channel, nozzle outlet and negative pressure mixing chamber, and the liquid inlet channel is used for inputting aerosol generating substrate, the airflow channel is used for airflow to flow along the first direction, and the nozzle outlet is used for exporting aerosol. Along the first direction, the upstream end of the negative pressure mixing chamber is communicated with the liquid inlet channel and the airflow channel, and the downstream end of the negative pressure mixing chamber is communicated with the nozzle outlet, and the flow passage sectional area of the upstream end is greater than the flow passage sectional area of the downstream end. The airflow channel is used for being communicated with the gas source and inputting airflow to the upstream end, so that the negative pressure mixing chamber forms a negative pressure environment, and the aerosol atomization substrate in the negative pressure mixing chamber is atomized. The aerosol generating substrate and airflow are mixed in the negative pressure mixing chamber, the atomizing nozzle is of "internal mixing type" structure, the aerosol generating substrate is mixed with high-speed airflow in the negative pressure mixing chamber, realizing primary atomization, and the aerosol generating substrate that is not fully atomized is mixed with low-speed airflow again at the nozzle outlet, realizing secondary atomization, and the mixing intensity of the two times of mixing enhances the mixing intensity of the two-phase flow of the atomizing nozzle, so that the airflow can cut the aerosol generating substrate more fully, the atomization effect is better, the content of large droplets in the aerosol is reduced, and the user experience is better. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is the perspective structural schematic diagram of the atomizing nozzle provided by the utility model embodiment;

[0018] Figure 2 It is the top view of the atomizing nozzle provided by the utility model embodiment;

[0019] Figure 3 It is Figure 2 the sectional view of A-A direction in

[0020] Figure 4 It is Figure 3 the enlarged view of C in

[0021] Figure 5 It is the explosion view of the atomizing nozzle provided by the utility model embodiment;

[0022] Figure 6 It is the sectional view of A-A direction of the shell provided by the utility model embodiment in Figure 2

[0023] Figure 7 It is the enlarged view of C in Figure 5

[0024] Figure 8 It is the simplified schematic diagram of the atomizing device provided by the utility model embodiment. ​​

[0025] Reference signs:

[0026] 10, atomizing nozzle; 1, liquid inlet channel; 2, air flow channel; 3, nozzle outlet; 4, negative pressure mixing cavity; 41, upstream end; 42, downstream end; 5, outer shell; 51, air inlet channel; 52, air flow section; 53, mixing section; 531, mixing part; 6, inner shell; 61, groove; 62, converging part; 621, through hole; 20, atomizer; 201, liquid storage bin; 30, air pump; 40, power supply. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical scheme and advantages of the utility model more clearly, the following will be further described in detail in combination with the drawings and examples. It should be understood that the specific examples described herein are only used to explain the utility model, and are not used to limit the utility model.

[0028] In the specific examples, each specific technical feature described can be combined in any suitable manner without contradiction, for example, different embodiments and technical solutions can be formed by combining different specific technical features. In order to avoid unnecessary repetition, various possible combinations of each specific technical feature in the utility model are not described again.

[0029] In the following description, the terms "first", "second", etc. are only used to distinguish different objects, and do not mean that there is the same or relationship between the objects. It should be understood that the position description "upper", "lower", "outer", "inner" is the position in the normal use state, and the "left", "right" direction represents the left and right direction shown in the specific corresponding schematic diagram, which can be the left and right direction in the normal use state or not.

[0030] It should be noted that the terms "include", "contain" or any other variant thereof are intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or device. Without more limitation, the element defined by the sentence "including one" does not exclude the existence of other identical elements in the process, method, article or device including the element. "Multiple" means greater than or equal to two.

[0031] The utility model embodiment provides a kind of atomizing nozzle 10 and atomizing device, such as Figure 8As shown, the atomization device includes an atomizer 20, which stores an aerosol generating substrate and can atomize the aerosol generating substrate into an aerosol. The atomization nozzle 10 is a spraying component in the atomizer 20, which can atomize the aerosol generating substrate to be atomized, so as to form an aerosol and spray it out of the atomization nozzle 10. The atomizer 20 can be applied to various atomization scenarios, for example, the atomizer 20 can be applied to medical cosmetology, daily life, etc. The aerosol generating substrate to be atomized can be a medicinal liquid, a perfume, and an aerosol substrate capable of generating a special smell, etc. Those skilled in the art can understand that the application scenarios of the atomizer 20 can be various, and the application scenarios of the atomizer 20 are not limited in the embodiments of the present application.

[0032] As shown in the Figures 1-3 embodiments of the present application, an atomization nozzle 10 is provided, which is internally provided with a liquid inlet channel 1, an airflow channel 2, a nozzle outlet 3 and a negative pressure mixing cavity 4. The liquid inlet channel 1 is used for inputting an aerosol generating substrate. In the case of ignoring the thickness and wall shape of the airflow channel 2, the airflow channel 2 is used for airflow to flow in a first direction, which is in the extension direction of the airflow channel 2 and also in the height direction of the atomizer 20 in a three-dimensional coordinate system. The first direction is the direction from bottom to top of the atomizer 20 in the use state. In the schematic diagram of the present application, the direction indicated by N1 indicates the first direction. The nozzle outlet 3 is used for guiding the aerosol out. It can be understood that the nozzle outlet 3 is located in front of the airflow channel 2 in the first direction N1, that is, the nozzle outlet 3 is located on the downstream side of the airflow channel 2. In the schematic diagram of the present application, the nozzle outlet 3 is located above the airflow channel 2.

[0033] As shown in the Figure 4 embodiments of the present application, along the first direction N1, the upstream end 41 of the negative pressure mixing cavity 4 communicates with the liquid inlet channel 1 and the airflow channel 2, and the downstream end 42 of the negative pressure mixing cavity 4 communicates with the nozzle outlet 3. The upstream end 41 of the negative pressure mixing cavity 4 is located in front of the first direction N1, which is also the upper end of the negative pressure mixing cavity 4 in the schematic Figure 4 embodiments of the present application; the downstream end 42 of the negative pressure mixing cavity 4 is located behind the first direction, which is also the lower end of the negative pressure mixing cavity 4 in the schematic Figure 4The lower end of the negative pressure mixing cavity 4. The airflow channel 2 is used to communicate with the gas source and input the airflow to the upstream end 41, so that the negative pressure mixing cavity 4 forms a negative pressure environment and atomizes the aerosol atomization substrate entering the negative pressure mixing cavity 4. The aerosol generating substrate and the airflow are mixed in the negative pressure mixing cavity 4. It can be simply understood that the atomizing nozzle 10 provided by the embodiment of the utility model is of an "internal mixing type" structure. The airflow channel 2 inputs high-speed airflow to the negative pressure mixing cavity 4, and the airflow speed is large, so that the negative pressure mixing cavity 4 forms a negative pressure environment. Under the action of negative pressure suction, the aerosol generating substrate is sucked into the negative pressure mixing cavity 4 through the liquid inlet channel 1. The liquid inlet channel 1 does not need to be connected with a liquid supply device such as a syringe pump, a stepping motor push rod, and the like. The number of components arranged in the atomizing nozzle 10 is small, and the structure is relatively simple.

[0034] As shown in Figure 4 , the flow passage cross-sectional area of the upstream end 41 of the negative pressure mixing cavity 4 is larger than that of the downstream end 42. The flow passage cross-sectional area of the upstream end 41 is small. After the airflow and the aerosol substrate that is not fully atomized are collected through the upstream end 41, they are guided to the nozzle outlet 3, and the gas-liquid two-phase flow can be mixed again at the nozzle outlet 3. The high-speed airflow is mixed with the aerosol generating substrate in the negative pressure mixing cavity 4 and cuts the aerosol generating substrate. Then, the high-speed airflow is converted into low-speed airflow and flows to the nozzle outlet 3. The low-speed airflow is mixed again with the aerosol generating substrate that is not fully atomized at the nozzle outlet 3. The low-speed airflow cuts the aerosol generating substrate that is not fully atomized for the second time, realizes secondary atomization, and enhances the mixing intensity of the atomizing nozzle 10 on the gas-liquid two-phase flow through two mixings. The energy of the airflow is more fully utilized, so that the airflow can more fully cut the aerosol generating substrate to reduce the content of large droplets in the aerosol and improve the atomization effect.

[0035] Specifically, as shown in Figure 4 , the inner wall forming the negative pressure mixing cavity 4 can have a regular profile continuously along the first direction N1, so that the flow passage cross-sectional area of the negative pressure mixing cavity 4 gradually decreases along the first direction N1. In this embodiment, the flow passage cross-sectional area at the downstream end 42 of the negative pressure mixing cavity 4 is the largest, and the flow passage cross-sectional area at the upstream end 41 is the smallest. Of course, the inner wall forming the negative pressure mixing cavity 4 can also have an irregular profile with abrupt changes along the first direction N1. In this embodiment, the position with the smallest flow passage cross-sectional area in the negative pressure mixing cavity 4 can be the position of the upstream end 41 or the intermediate position between the upstream end 41 and the downstream end 42. Similarly, the position with the largest flow passage cross-sectional area in the negative pressure mixing cavity 4 can be the position of the downstream end 42 or the intermediate position between the upstream end 41 and the downstream end 42. However, no matter what structure the inner wall forming the negative pressure mixing cavity 4 has, as long as the flow passage cross-sectional area of the upstream end 41 of the negative pressure mixing cavity 4 is larger than that of the downstream end 42.

[0036] The utility model discloses a kind of atomizing nozzles 10 provided in an embodiment, the atomizing nozzle 10 is internally provided with liquid inlet channel 1, airflow channel 2, nozzle outlet 3 and negative pressure mixing chamber 4, liquid inlet channel 1 is used to input aerosol generating substrate, airflow channel 2 is for airflow to flow along the first direction N1, nozzle outlet 3 is used to export aerosol. Along the first direction N1, the upstream end 41 of negative pressure mixing chamber 4 is communicated with liquid inlet channel 1 and airflow channel 2, the downstream end 42 of negative pressure mixing chamber 4 is communicated with nozzle outlet 3, and the flow passage cross-sectional area of upstream end 41 is greater than the flow passage cross-sectional area of downstream end 42. Airflow channel 2 is used to communicate with gas source, and airflow is input to upstream end 41, so that negative pressure mixing chamber 4 forms negative pressure environment, and aerosol atomization substrate is atomized into negative pressure mixing chamber 4. On the one hand, negative pressure mixing chamber 4 forms negative pressure environment, under the action of negative pressure attraction, aerosol generating substrate is input into negative pressure mixing chamber 4 via liquid inlet channel 1, liquid inlet channel 1 does not need to be connected with injection pump, stepping motor push rod and other liquid supply device, and the structure is simple and convenient to implement. On the other hand, high-speed airflow mixes with aerosol generating substrate in negative pressure mixing chamber 4, and cuts aerosol generating substrate, then high-speed airflow is converted into low-speed airflow, low-speed airflow and insufficiently atomized aerosol substrate are gathered after upstream end 41, and guided to nozzle outlet 3. Low-speed airflow mixes with insufficiently atomized aerosol generating substrate again at nozzle outlet 3, and secondary cutting insufficiently atomized aerosol generating substrate, realizes secondary atomization. The atomizing nozzle 10 provided in the embodiment of the utility model is "internal mixing type" structure, aerosol generating substrate is mixed with high-speed airflow in negative pressure mixing chamber 4, and low-speed airflow is mixed with fully atomized aerosol generating substrate again at nozzle outlet 3, and twice mixing enhances the mixing intensity of two-phase flow of atomizing nozzle 10 to airflow, so that airflow can cut aerosol generating substrate more fully, reduce the content of large droplets in aerosol, improve atomization effect, and improve user's use experience.

[0037] In some embodiments, as Figure 3 and Figure 4As shown, the inside of the atomizing nozzle 10 has a mixing part 531 for forming the negative pressure mixing cavity 4, and the upstream end 41 and the downstream end 42 are opposite ends of the mixing part 531, that is, the flow passage cross-sectional area of the upper end of the mixing part 531 is smaller than that of the lower end of the mixing part 531. The inner wall of the mixing part 531 is arranged around the first direction N1, that is, the mixing part 531 is a rotating body, the flow passage shape of the inner wall of the mixing part 531 is approximately circular, and the ratio of the flow passage cross-sectional area of the upper end to the lower end of the mixing part 531 is positively correlated with the ratio of the inner wall diameter of the upper end to the lower end of the mixing part 531, that is, the inner wall diameter at the upper end of the mixing part 531 is smaller than that at the lower end of the mixing part 531. The inner wall diameter of the mixing part 531 decreases along the first direction N1, and it can be understood that the inner wall of the mixing part 531 has a regular profile continuously along the first direction N1, and the cross-sectional shape of the inner wall of the mixing part 531 in the axial direction (i.e., the first direction N1) is approximately trapezoidal, that is, the cross-sectional shape of the negative pressure mixing cavity 4 in the axial direction is approximately trapezoidal. According to Bernoulli's principle, the flow passage cross-sectional area is negatively correlated with the fluid flow rate, that is, the fluid flow rate is faster at the position with smaller flow passage cross-sectional area. The inner wall diameter of the mixing part 531 gradually decreases along the first direction N1, so that the flow passage cross-sectional area of the negative pressure mixing cavity 4 gradually decreases along the first direction N1, and the aerosol generating substrate and the airflow gradually accelerate in the negative pressure mixing cavity 4, which facilitates the formation of a high-speed airflow to form a negative pressure environment in the negative pressure mixing cavity 4, and the molecular flow velocity in the negative pressure mixing cavity 4 is faster, thereby improving the cutting efficiency of the airflow on the aerosol generating substrate and further reducing the content of large droplets in the aerosol.

[0038] For ease of explanation, the utility model embodiment provides Table 1, and Table 1 is a performance comparison table measured by different cross-sectional shapes of the negative pressure mixing cavity 4 in the axial direction under the same structure, the experimental data in Table 1 takes the whole machine of the scalp applicator as the atomizer 20, takes the minoxidil medium as the aerosol generating substrate, and is obtained by controlling the cross-sectional shape of the negative pressure mixing cavity 4 in the axial direction by the control variable method. Among them, as shown in Table 1, Figure 4 As shown, the inner wall diameter of the mixing part 531 at the upstream end 41 is L1, the inner wall diameter of the mixing part 531 at the downstream end 42 is L2, and the distance between the upstream end 41 and the downstream end 42 is L3, and it can be understood that L3 represents the height of the mixing part 531 and the negative pressure mixing cavity 4.

[0039]

[0040] Table 1

[0041] As shown in Table 1, under the same structure, different axial cross-sectional shapes of the negative pressure mixing chamber 4 affect the pressure and atomization volume within the negative pressure mixing chamber 4, and also affect the atomized aerosol particle size. In the embodiment in which the axial cross-sectional shape of the negative pressure mixing chamber 4 is roughly trapezoidal, a negative pressure is present within the negative pressure mixing chamber 4. The aerosol-generating matrix in the liquid inlet channel 1 automatically enters the negative pressure mixing chamber 4 under the action of the negative pressure attraction, and can then be cut by the airflow entering from the airflow channel 2 to form an aerosol. In addition, the aerosol particle size reflects the degree of atomization of the aerosol-generating matrix, that is, the degree of cutting of the aerosol-generating matrix by the airflow and the mixing intensity of the airflow and the aerosol-generating matrix. When the aerosol particle size is less than 55 μm, the aerosol located at the nozzle outlet 3 contains fewer large droplets, and the aerosol-generating matrix can be more fully atomized. As shown in Table 1, in the embodiment in which the cross-sectional shape of the negative pressure mixing chamber 4 in the axial direction is roughly trapezoidal, the aerosol particle size at the nozzle outlet 3 is 40 μm, which meets the above requirements. That is, the cross-sectional shape of the negative pressure mixing chamber 4 in the axial direction is roughly trapezoidal, which can make the airflow and the aerosol generating matrix mixed more fully, and the aerosol generating matrix can be more fully cut by the airflow, thereby achieving more sufficient atomization.

[0042] In some embodiments, as Figure 4 As shown, the flow channel diameter at the upstream end 41 is greater than or equal to 1.2 mm and less than or equal to 1.5 mm, that is, 1.2 mm ≤ L1 ≤ 1.5 mm. For example, the inner diameter at the upstream end 41 of the mixing section 531 can be 1.2 mm, 1.25 mm, 1.3 mm, 1.35 mm, 1.4 mm, 1.45 mm, or 1.5 mm, or any other value within the above range. The present invention provides Table 2, which is a comparison table of various performance measurements with different inner diameters L1 of the mixing section 531 at the upstream end 41 under the same structure, wherein L2 = 0.85 mm and L3 = 0.45 mm. The experimental method used is the same as that of Table 1.

[0043]

[0044] Table 2

[0045] As shown in Table 2, in the case of L1 out of the range (L1 < 1.2 mm and L1 > 1.5 mm), the airflow flow rate is not fast enough, the negative pressure mixing cavity 4 cannot form a negative pressure environment, the pressure in the negative pressure mixing cavity 4 is positive, and the aerosol generating substrate in the liquid inlet channel 1 cannot be automatically introduced, so that the liquid supply atomization cannot be normal. In the case of 1.2 mm≤L1≤1.5 mm, the airflow flow rate in the negative pressure mixing cavity 4 is fast, the negative pressure mixing cavity 4 can form a negative pressure environment, so as to provide a negative pressure suction force to guide the aerosol generating substrate in the liquid inlet channel 1 into the negative pressure mixing cavity 4. In addition, in the case of 1.2 mm≤L1≤1.5 mm, the aerosol particle size at the nozzle outlet 3 is less than 55 μm, the airflow and the aerosol generating substrate can be more fully mixed, the airflow energy utilization rate is higher, so that the aerosol generating substrate can be more fully cut by the airflow, and a better atomization effect is obtained.

[0046] In some embodiments, as shown in Figure 4 the flow channel diameter of the downstream end 42 is greater than or equal to 0.7 mm and less than or equal to 1 mm, that is, 0.7 mm≤L2≤1 mm, for example, the inner diameter of the upstream end 41 of the mixing part 531 can be 0.7 mm, 0.75 mm, 0.8 mm, 0.85 mm, 0.9 mm, 0.95 mm or 1 mm, etc. The utility model embodiment provides Table 3, and Table 3 is a performance comparison table measured by different inner diameters L2 of the mixing part 531 at the downstream end 42 under the same structure, wherein L1=1.25 mm, L3=0.45 mm, and the experimental method adopted is the same as that in Table 1.

[0047]

[0048] Table 3

[0049] As shown in Table 3, in the case of L2 out of the range (L2 < 0.7 mm and L2 > 1 mm), the pressure in the negative pressure mixing cavity 4 is positive, and the aerosol generating substrate in the liquid inlet channel 1 cannot be input, so that the liquid supply atomization cannot be normal. In the case of 0.7 mm≤L2≤1 mm, the negative pressure mixing cavity 4 can form a negative pressure environment, so as to provide a negative pressure suction force to guide the aerosol generating substrate in the liquid inlet channel 1 into the negative pressure mixing cavity 4. And the aerosol particle size at the nozzle outlet 3 is less than 55 μm, the airflow and the aerosol generating substrate can be more fully mixed, so as to more fully atomize the aerosol generating substrate.

[0050] In some embodiments, the distance from the upstream end 41 to the downstream end 42 is greater than or equal to 0.3 mm and less than or equal to 0.5 mm, i.e. 0.3 mm≤L3≤0.5 mm. For example, the height of the mixing portion 531 can be 0.3 mm, 0.35 mm, 0.4 mm, 0.45 mm or 0.5 mm or any other value within the above range. The present embodiment provides Table 4, which is a performance comparison table of different heights L3 of the mixing portion 531 under the same structure, wherein L1=1.25 mm, L2=0.85 mm, and the experimental method is the same as that of Table 1.

[0051]

[0052] Table 4

[0053] As shown in Table 4, in the case of L3<0.3 mm, although the negative pressure mixing cavity 4 can form a negative pressure environment, the utilization rate of airflow energy is poor, and the airflow is difficult to fully cut the aerosol generating substrate, the aerosol particle size at the nozzle outlet 3 is large, which does not meet the requirement that the aerosol particle size is less than 55 μm, the atomization is not sufficient, and the content of large droplets in the aerosol is high. In the case of L3>0.5 mm, the pressure in the negative pressure mixing cavity 4 is positive, and the aerosol generating substrate in the liquid inlet channel 1 cannot be input, so that the liquid supply atomization cannot be normal. In the case of 0.3 mm≤L3≤0.5 mm, the fluid flow rate in the negative pressure mixing cavity 4 is fast, the negative pressure mixing cavity 4 can form a negative pressure environment, so as to automatically guide the aerosol generating substrate in the liquid inlet channel 1 into the negative pressure mixing cavity 4. And the aerosol particle size at the nozzle outlet 3 is less than 55 μm, and the airflow and the aerosol generating substrate can be fully mixed.

[0054] In some embodiments, as shown in Figure 3 and Figure 5 , the atomizing nozzle 10 comprises an outer shell 5 and an inner shell 6, the top end of the outer shell 5 is provided with a nozzle outlet 3, and the inner shell 6 is provided with a liquid inlet channel 1. The inner shell 6 is arranged in the outer shell 5 and is spaced apart from part of the outer shell 5, i.e. the outer shell 5 and the inner shell 6 are spaced apart in the radial direction, and the spacing between the inner shell 6 and the outer shell 5 in the radial direction forms an airflow channel 2 to input airflow into the negative pressure mixing cavity 4. In the first direction N1, the spacing between the top end of the inner shell 6 and the top end of the outer shell 5 forms the negative pressure mixing cavity 4 (see Figure 4 ). The outer shell 5 and the inner shell 6 jointly constitute the atomizing nozzle 10, and the airflow channel 2 is formed by the spacing between the outer shell 5 and the inner shell 6 in the radial direction, and the negative pressure mixing cavity 4 is formed by the spacing between the top end of the inner shell 6 and the top end of the outer shell 5 in the axial direction, which simplifies the processing difficulty of the airflow channel 2 and the negative pressure mixing cavity 4, and has a simple structure and is easy to implement.

[0055] As shown in Figure 6 and Figure 8As shown in FIG. 1, the outer shell 5 is provided with an air inlet channel 51 which is in communication with the airflow channel 2 and the air source. In this way, the inner shell 6 forms the liquid inlet channel 1, and the outer shell 5 forms the air inlet channel 51, so that the airflow input path and the input path of the aerosol generating substrate are arranged on different components, facilitating the separation of the airflow path and the flow path of the aerosol generating substrate, so as to reduce the possibility of the airflow mixing with the aerosol generating substrate without being sufficiently accelerated.

[0056] In some embodiments, as shown in FIG. 1, Figure 3 and Figure 6 As shown in FIG. 1, the outer shell 5 includes a airflow section 52 and a mixing section 53 which are connected, the airflow section 52 is arranged in spaced apart relationship with the inner shell 6, and the mixing section 53 is arranged in abutting relationship with the inner shell 6, and a mixing portion 531 is formed in the mixing section 53. It should be noted that the present embodiment divides the outer shell 5 into the airflow section 52 and the mixing section 53, which means that the outer shell 5 is roughly divided into two regions in appearance, rather than being divided into two components, and in the schematic view shown in FIG. 1, the mixing section 53 is roughly located at the position of the square frame. Figure 6

[0057] As shown in FIG. 1, Figure 3 and Figure 7 As shown in FIG. 1, the portion of the inner shell 6 which is in abutting relationship with the mixing section 53 is provided with a groove 61, and the groove 61 and the gap between the airflow section 52 and the inner shell 6 in the radial direction together form the airflow channel 2. It can be understood that the groove 61 is in communication with the negative pressure mixing cavity 4, and the end of the groove 61 which is in communication with the negative pressure mixing cavity 4 forms the outlet end of the airflow channel 2, and the airflow sequentially flows through the air inlet channel 51, the gap between the airflow section 52 and the inner shell 6 in the radial direction, the groove 61, the negative pressure mixing cavity 4, and the nozzle outlet 3 in the atomizing nozzle 10. The airflow flows into the narrow groove 61 from the radial gap between the airflow section 52 and the inner shell 6, and the airflow speed is accelerated, facilitating the accumulation of kinetic energy of the airflow to more fully cut the aerosol generating substrate.

[0058] In some embodiments, as shown in FIG. 1, Figure 3 and Figure 6 As shown in FIG. 1, the inner wall diameter of the mixing section 53 decreases along the first direction N1. The inner wall of the mixing section 53 gradually converges the airflow, and the airflow gradually converges and accumulates towards the liquid inlet channel 1, so as to facilitate the mixing of the airflow and the aerosol generating substrate, thereby utilizing the kinetic energy of the airflow to cut the aerosol generating substrate to atomize the aerosol with less large droplet content.

[0059] In some embodiments, as shown in FIG. 1, Figure 3 and Figure 7 ​As shown, along the direction of airflow flowing in the groove 61, the cross-sectional area of the flow passage of the groove 61 decreases. In each groove 61, the airflow gradually accelerates along the flow direction, and the kinetic potential energy of the airflow gradually increases, so as to form a high-speed airflow in the negative pressure mixing cavity 4, so that the negative pressure mixing cavity 4 forms a negative pressure environment, and the large liquid droplet content in the aerosol is reduced by using the large airflow kinetic energy to impact the aerosol generating substrate.

[0060] In some embodiments, as shown in Figure 4 and Figure 7 As shown, the top end of the inner shell 6 is provided with a converging portion 62 located in the negative pressure mixing cavity 4 and provided with a through hole 621 communicating the liquid inlet channel 1 and the groove 61, so as to mix the aerosol generating substrate entering from the liquid inlet channel 1 and the airflow entering from the groove 61. The converging portion 62 is located in the negative pressure mixing cavity 4, and therefore it can be understood that the space in the through hole 621 is smaller than the space in the negative pressure mixing cavity 4. Compared with the embodiment in which the airflow and the aerosol generating substrate are directly discharged into the negative pressure mixing cavity 4 for mixing, the converging portion 62 provided with the through hole 621 in the embodiment of the application mixes the airflow and the aerosol generating substrate in the through hole 621, so that the airflow and the aerosol generating substrate are mixed in a smaller space, thereby enhancing the mixing intensity of the airflow and the aerosol generating substrate, facilitating the airflow to cut the aerosol generating substrate more fully, and further reducing the large liquid droplet content in the aerosol.

[0061] As shown in Figure 8 The utility model discloses an atomization device, the atomization device includes atomization nozzle 10, atomizer 20, air pump 30 and power supply 40, because the atomization device adopts above-mentioned atomization nozzle 10, therefore the atomization device provided by the utility model embodiment has the same technical effect with atomization nozzle 10, namely the airflow utilization rate of atomization device is higher, and the mixing intensity of gas-liquid two-phase flow is higher, can atomize aerosol generating substrate more fully, obtains the aerosol of less large liquid droplet content.

[0062] As shown in Figure 8As shown, the atomizer 20 has a liquid storage chamber 201 inside for accommodating aerosol atomization substrate, the liquid storage chamber 201 is communicated with the liquid inlet channel 1, and the aerosol atomization substrate is input to the liquid inlet channel 1. The liquid storage chamber 201 does not need to rely on a syringe pump, a stepping motor push rod or other liquid supply device to supply liquid to the liquid inlet channel 1, a negative pressure environment is formed in the negative pressure mixing chamber 4, a pressure difference is generated between the upper end and the lower end of the liquid inlet channel 1 to form a siphon effect, the aerosol generating substrate automatically flows to the negative pressure mixing chamber 4 through the liquid inlet channel 1, the number of components in the atomization device is less, the structure is simple, and the atomization device is easy to implement. The air pump 30 is communicated with the atomization nozzle 10 to input airflow, the air pump 30 refers to a device that discharges gas from a closed space or adds gas to a closed space, the air pump 30 continuously compresses gas by power or hand force, generates air pressure, and thus the airflow is pressed into the atomization nozzle 10. The airflow entering the atomization nozzle 10 impacts the aerosol atomization substrate input from the liquid inlet channel 1 under a certain pressure, so that the aerosol atomization substrate is atomized into aerosol. The power supply 40 is used to supply power to the air pump 30, and in the case that the atomizer 20 needs to be powered, the power supply 40 can also be used to supply power to the atomizer 20.

[0063] The above only describes the preferred embodiments of the present application and is not intended to limit the present application, and 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. An atomizing nozzle characterized by, The atomizing nozzle is internally provided with a mixing portion for forming the negative pressure mixing chamber, an inner wall of the mixing portion is arranged around the first direction, and a diameter of the inner wall of the mixing portion decreases along the first direction, the upstream end and the downstream end being opposite two ends of the mixing portion. The flow channel diameter of the upstream end is greater than or equal to 1.2 mm and less than or equal to 1.5 mm. The flow channel diameter of the downstream end is greater than or equal to 0.7 mm and less than or equal to 1 mm. The distance from the upstream end to the downstream end is greater than or equal to 0.3 mm and less than or equal to 0.5 mm. The atomizing nozzle comprises: An outer shell, a top end of the outer shell being provided with the nozzle outlet; 2. The atomizing nozzle of claim 1, wherein An inner shell, the inner shell being internally provided with the liquid inlet channel, the inner shell being arranged in the outer shell and being spaced apart from part of the outer shell; along the radial direction, the inner shell and the outer shell form the airflow channel; along the first direction, a top end of the inner shell is spaced apart from a top end of the outer shell to form the negative pressure mixing chamber; 3. The atomizing nozzle of claim 2, wherein The outer shell is provided with an air inlet channel for communicating the airflow channel and the air source.

4. The atomizing nozzle according to claim 2 or 3, characterized in that The outer shell comprises a gas flow section and a mixing section connected with each other, the gas flow section being arranged in a spaced-apart manner with the inner shell, and the mixing section being arranged in abutment with the inner shell, and the mixing portion being formed in the mixing section; 5. The atomizing nozzle of claim 1 or 2, wherein The part of the inner shell in abutment with the mixing section is provided with a groove, and the groove and the gap between the gas flow section and the inner shell in the radial direction jointly form the airflow channel.

6. The atomizing nozzle of claim 2 wherein, The diameter of the inner wall of the mixing section decreases along the first direction; And / or, along the airflow flow direction in the groove, the flow channel cross-sectional area of the groove decreases. The top end of the inner shell is protrudingly provided with a gathering portion, and the gathering portion is provided with a through hole for communicating the liquid inlet channel and the groove. The atomizing device comprises the atomizing nozzle according to any one of claims 1 to 9, and further comprises:

7. The atomizing nozzle of claim 6 wherein, An atomizer, the atomizer being internally provided with a liquid storage bin for accommodating the aerosol atomization substrate, the liquid storage bin being in communication with the liquid inlet channel and inputting the aerosol atomization substrate into the liquid inlet channel; An air pump, the air pump being in communication with the atomizing nozzle to input the airflow; 8. The atomizing nozzle of claim 7, wherein A power supply, the power supply being used for supplying power to the air pump. ​ 9. The atomizing nozzle of claim 7 wherein, ​ 10. An atomising device characterised in that, ​ ​ ​ ​

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