Atomizing nozzle

Abstract

The present application relates to an atomizing nozzle, comprising a shell, a resonator and a liquid outlet pipe. A deflector is arranged inside the shell, an annular gap is provided between the shell and the deflector, an annular resonance groove is provided between the resonator and the shell, a liquid inlet and a first connecting channel are also provided on the resonator, the liquid outlet pipe is arranged on the resonator, a second connecting channel is provided between the liquid outlet pipe and the resonator, and the liquid outlet pipe, the liquid inlet and the first connecting channel are interconnected through the second connecting channel; the atomizing nozzle of the present application can utilize its special structure so that gas with a relatively low air pressure can form a supersonic jet through the annular gap after being input into the shell, and the supersonic jet is suppressed when entering the annular resonance groove to generate a positive shock wave, so that the liquid entering the second connecting channel through the liquid inlet can be quickly atomized by the subsonic airflow with a periodic positive shock wave, so that the nozzle does not need to be used with a high-pressure water tank, saving the use cost and expanding the scope of use.

Description

Technical Field

[0001] The present application relates to the technical field of nozzles, and in particular to atomizing nozzles. Background Art

[0002] Atomizing nozzles are widely used in dust reduction, fire fighting, virus disinfection and other fields due to their characteristics of small liquid consumption, low pollution and great efficacy.

[0003] At present, in the field of firefighting, water mist nozzles are mostly used for firefighting, but water mist nozzles need to be used in conjunction with high-pressure water tanks so that the sprayed water mist can achieve an atomization effect and firefighting range that meet firefighting requirements. However, the use of high-pressure water tanks will result in higher costs for firefighting nozzles and limited scope of use. Summary of the invention

[0004] Based on this, it is necessary to provide an atomizing nozzle to address the above-mentioned problems of high firefighting costs and limited scope of use.

[0005] An atomizing nozzle, comprising:

[0006] case;

[0007] A deflector is disposed inside the shell, and an annular gap is provided between the shell and the deflector;

[0008] A resonator is arranged on the housing and is located downstream of the deflector. The resonator is provided with an annular resonance groove coaxial with the annular gap, and the notch of the annular resonance groove is arranged toward the annular gap. The resonator is also provided with a liquid inlet and a first connecting channel, and the first connecting channel is coaxial with and communicated with the annular gap.

[0009] a liquid outlet pipe, arranged on the resonator and coaxial with the annular gap, a second connecting channel being provided between the liquid outlet pipe and the resonator, and the liquid outlet pipe, the liquid inlet and the first connecting channel being interconnected through the second connecting channel;

[0010] The liquid outlet pipe has a liquid inlet and a liquid outlet, and the liquid inlet connects the second connecting channel and the liquid outlet, and the cross-sectional area of ​​the annular gap perpendicular to the axial direction of the shell is larger than the cross-sectional area of ​​the liquid inlet perpendicular to the axial direction of the shell.

[0011] In one embodiment, the inner diameter of the liquid inlet hole is smaller than the inner diameter of the liquid outlet hole.

[0012] In one embodiment, the first connecting channel includes a first air inlet hole and a second air inlet hole, the distance between the first air inlet hole and the liquid inlet hole is greater than the distance between the second air inlet hole and the liquid inlet hole, and the aperture of the first air inlet hole is greater than the aperture of the second air inlet hole.

[0013] In one embodiment, the aperture of the first air inlet hole is consistent with the inner diameter of the annular resonant slot.

[0014] In one embodiment, the aperture of the second air inlet hole is consistent with the aperture of the liquid inlet hole.

[0015] In one embodiment, the resonator is provided with a mounting groove, the liquid outlet pipe is inserted into the mounting groove, the second connecting channel includes a connecting gap and an auxiliary channel, the auxiliary channel is arranged on the liquid outlet pipe and is connected with the liquid inlet, the connecting gap is located between the liquid outlet pipe and the first connecting channel, and the connecting gap is connected with the auxiliary channel.

[0016] In one of the embodiments, an annular groove is provided on the outer peripheral surface of the liquid outlet pipe, and a plurality of diversion channels connecting the connecting gap and the annular groove are provided on the liquid outlet pipe. The annular groove and the plurality of diversion channels cooperate to form the auxiliary channel.

[0017] In one embodiment, the ratio of the width a of the annular gap to the wavelength λ of the sound wave at the gas operating frequency is in the range of 0.015-0.03.

[0018] In one embodiment, the ratio of the height h of the annular resonant slot to the width a of the annular gap is in the range of 1.5-2.5.

[0019] In one of the embodiments, along a direction perpendicular to the axial direction of the annular gap, a ratio between a cross-sectional area of ​​the annular gap and a cross-sectional area of ​​the liquid inlet hole is in a range of 1.7-1.8.

[0020] The above-mentioned atomizing nozzle can utilize its special structure to allow gas with a relatively low air pressure to form a supersonic jet through the annular gap after being input into the shell, and to suppress the supersonic jet when entering the annular resonance groove, generating a positive shock wave, and generating a subsonic zone after entering the second connecting channel through the first connecting channel, so that the liquid entering the second connecting channel through the liquid inlet can be quickly atomized by the subsonic airflow with a periodic positive shock wave. At the same time, by making the cross-sectional area of ​​the annular gap along the axial direction perpendicular to the annular gap larger than the cross-sectional area of ​​the liquid inlet hole along the axial direction perpendicular to the annular gap, the atomization effect of the periodic shock wave on the liquid can be further guaranteed, so that the nozzle does not need to be used in conjunction with a high-pressure water tank, saving the use cost and expanding the scope of use. The above-mentioned nozzle structure can also make the particle size of the sprayed atomized liquid smaller, so that the atomized liquid can float in the air and will not fall as soon as possible, thereby saving energy while ensuring the fire-fighting, dust removal and sterilization effects. Moreover, since the above-mentioned nozzle structure only needs to use water and nitrogen when performing fire-fighting operations, it is more environmentally friendly. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] FIG. 1 is a schematic diagram of the structure of an atomizing nozzle according to some embodiments of the present application.

[0022] FIG. 2 is a partial enlarged view of portion A of FIG. 1 .

[0023] FIG. 3 is another schematic diagram of the structure of the atomizing nozzle according to some embodiments of the present application.

[0024] FIG. 4 is a particle size test report of some embodiments of the present application.

[0025] FIG5 is a particle size test report of other embodiments of the present application.

[0026] FIG. 6 is a flow rate variation diagram of some embodiments of the present application.

[0027] FIG. 7 is a diagram showing range variation according to some embodiments of the present application.

[0028] FIG8 is a frequency variation diagram of some embodiments of the present application.

[0029] FIG. 9 is a graph showing particle size variation in some embodiments of the present application.

[0030] Reference numerals:

[0031] 1. Shell; 11. Inlet pipe; 12. Upper gland; 13. Shell; 14. Diverter pipe; 15. Middle gland; 16. Lower gland;

[0032] 2. Resonator;

[0033] 21. Ring resonant tank;

[0034] 22. Liquid inlet;

[0035] 23, first connecting channel; 231, first air inlet; 232, second air inlet;

[0036] 24, second connecting channel; 241, connecting gap; 242, auxiliary channel;

[0037] 3. Liquid outlet pipe; 31. Liquid inlet hole; 32. Liquid outlet hole;

[0038] 4. Deflector;

[0039] 5. Annular gap. DETAILED DESCRIPTION

[0040] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0041] In the description of the present application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0042] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0043] In this application, unless otherwise clearly specified and limited, if the terms "installed", "connected", "connected", "fixed" and the like appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0044] In the present application, unless otherwise clearly specified and limited, if there is a description that a first feature is "above" or "below" a second feature, etc., or similar descriptions appear, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0045] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only implementation method.

[0046] Atomizing nozzles are widely used in pesticide spraying, paint spraying, fire fighting, disinfection and deodorization due to their low liquid consumption, low pollution and high efficacy. At present, most water mist nozzles are used for fire fighting, but they need to be used with high-pressure water tanks so that the sprayed water mist can achieve the atomization effect and fire fighting range that meet the fire fighting requirements. However, the use of high-pressure water tanks will result in higher costs for fire fighting nozzles and limited scope of use.

[0047] Therefore, the present application provides a new fine water mist nozzle, which can use the special structural resonance groove of the nozzle to atomize water by the periodic shock wave generated in the supersonic gas jet under the condition of low-pressure gas, so as to obtain discrete droplet particle size.

[0048] Referring to Fig. 1, an atomizing nozzle comprises a coaxially arranged housing 1, a resonator 2 and a liquid outlet pipe 3. The resonator 2 refers to an electronic component that generates a resonant frequency and has the characteristics of stability and good anti-interference performance.

[0049] In the specific setting, referring to Figures 1 to 3, a deflector 4 is provided inside the shell 1, and an annular gap 5 is provided between the shell 1 and the deflector 4. Specifically, the shell 1 includes an air inlet pipe 11, an upper pressure cover 12 and an outer shell 13, and the air inlet pipe 11 is connected to the outer shell 13 through the upper pressure cover 12. The deflector 4 includes a fixed part and a deflection part coaxial with the annular gap 5, and the fixed part is located inside the outer shell 13 and connected to the air inlet pipe 11 through a nut and an elastic gasket. A plurality of shunt pipes 14 are provided inside the outer shell 13, and the plurality of shunt pipes 14 are uniformly arranged on the outer circumference of the fixed part around the axial direction of the annular gap 5. The deflection part is arranged on the fixed part, and an annular gap 5 is provided between the fixed part and the inner circumference of the shell 1. Among them, the deflection part has an inclined surface facing the shunt pipe 14. When the gas enters the outer shell 13 through the air inlet pipe 11, it can be blown onto the inclined surface of the deflection part through the plurality of shunt pipes 14, and output to the resonator 2 through the annular gap 5.

[0050] Referring to FIGS. 1 to 3 , the resonator 2 is disposed on the housing 1 , and an annular resonance groove 21 coaxial with the annular gap 5 is disposed on the resonator 2 , and the notch of the annular resonance groove 21 is disposed toward the annular gap 5 . Specifically, the resonator 2 is connected to the housing 13 through the middle pressure cover 15 , and the annular resonance groove 21 opens on the side of the resonator 2 facing the deflector 4 , and extends a distance away from the resonator 2 , and the extension distance is the height h of the annular resonance groove 21 . The annular resonance groove 21 is formed by the resonator 2 and the housing 1 , and the outer diameter of the annular resonance groove 21 is consistent with the outer diameter of the annular gap 5 , and the inner diameter of the annular resonance groove 21 is larger than the outer diameter of the annular gap 5 , so that the gas output from the annular gap 5 can be directly blown into the annular resonance groove 21 .

[0051] The resonator 2 is also provided with a liquid inlet 22 and a first connecting channel 23, and the first connecting channel 23 is coaxially connected to the annular gap 5. Specifically, the first connecting channel 23 is opened on the side of the resonator 2 facing the deflector 4, and the aperture of the first connecting channel 23 is consistent with the inner diameter of the annular resonance groove 21, so that the gas blown into the annular resonance groove 21 can be output through the first connecting channel 23. The liquid inlet 22 is opened on the side wall of the resonator 2, and the axial direction of the liquid inlet 22 is perpendicular to the axial direction of the first connecting channel 23, so that the liquid inlet pipe can be installed on the liquid inlet 22 later.

[0052] The liquid outlet pipe 3 is arranged on the resonator 2 and is coaxial with the annular gap 5. A second connecting channel 24 is provided between the liquid outlet pipe 3 and the resonator 2, and the liquid outlet pipe 3, the liquid inlet 22 and the first connecting channel 23 are interconnected through the second connecting channel 24. Specifically, a mounting groove coaxial with the annular gap 5 is provided on the resonator 2, and the liquid outlet pipe 3 is inserted in the mounting groove and connected to the resonator 2 through the lower pressure cover 16. A second connecting channel 24 is provided between the liquid outlet pipe 3 and the resonator 2, and the second connecting channel 24 is located at the intersection of the liquid outlet pipe 3, the liquid inlet 22 and the first connecting channel 23. The gas in the first connecting channel 23 can be output to the second connecting channel 24, and the liquid in the liquid inlet 22 can also be output to the second connecting channel 24, so that the liquid in the second connecting channel 24 can be quickly atomized under the impact of the gas and sprayed out through the liquid outlet pipe 3.

[0053] Referring to Fig. 1-Fig. 2, the liquid outlet pipe 3 has a liquid inlet hole 31 and a liquid outlet hole 32 arranged along the axis, and the liquid inlet hole 31 communicates with the second connecting channel 24 and the liquid outlet hole 32. The atomized liquid in the second connecting channel 24 can enter the liquid outlet pipe 3 through the liquid inlet hole 31 and be sprayed out through the liquid outlet hole 32. Along the axial direction perpendicular to the annular gap 5, the cross-sectional area of ​​the annular gap 5 is larger than the cross-sectional area of ​​the liquid inlet hole 31. By making the atomized liquid be output through the liquid inlet hole 31 with a smaller aperture, the atomization effect of the periodic shock wave on the liquid can be further ensured.

[0054] In summary, the atomizing nozzle of the present application can utilize its special structure to allow the gas with a relatively low pressure to form a supersonic jet through the annular gap 5 after being input into the shell 1, and suppress the supersonic jet when entering the annular resonance groove 21, generate a positive shock wave, and generate a subsonic zone after entering the second connecting channel 24 through the first connecting channel 23, so that the liquid entering the second connecting channel 24 through the liquid inlet 22 can be quickly atomized by the subsonic airflow with a periodic positive shock wave, and at the same time, by making the annular gap 5 along the axial direction perpendicular to the annular gap 5 The cross-sectional area is larger than the cross-sectional area of ​​the liquid inlet hole 31 along the axis perpendicular to the annular gap 5, which can further ensure the atomization effect of the periodic shock wave on the liquid, so that the nozzle does not need to be used in conjunction with a high-pressure water tank, saving the use cost and expanding the scope of use. The above-mentioned nozzle structure can also make the particle size of the sprayed atomized liquid smaller, so that the atomized liquid can float in the air and will not fall as quickly as possible, thereby saving energy while ensuring the fire-fighting, dust removal and sterilization effects. Moreover, since the above-mentioned nozzle structure only needs to use water and nitrogen when performing fire-fighting operations, it is more environmentally friendly.

[0055] The specific effect of the atomizing nozzle of the present application can be referred to the particle size test report in Figures 4 and 5:

[0056] According to the particle size test report in FIG. 4 , the nozzle of the present application can spray droplets with a DV0.50 of 37.656 μm and a DV0.97 of 65.620 μm when the gas pressure is 0.3 MPa and the liquid flow rate is 0.92 L / min.

[0057] According to the particle size test report in FIG. 5 , the nozzle of the present application can spray droplets with a DV0.50 of 35.847 μm and a DV0.97 of 56.389 μm when the gas pressure is 0.35 MPa and the liquid flow rate is 1.02 L / min.

[0058] Among them, DV0.50 is usually used to describe the size distribution of droplets in water mist or water spray. In the technical specifications of fine water mist fire extinguishing systems, DV0.50 refers to the diameter of droplets sprayed from the nozzle and formed on a plane 1.0m below the axis of the nozzle under the minimum design working pressure, where 50% of the droplet diameters are less than or equal to a certain value. This parameter is one of the key indicators for measuring droplet size and is used to ensure that the fine water mist system can produce sufficiently fine droplets to achieve a fire extinguishing effect.

[0059] DV0.97 is often used to describe the characteristics of particle size distribution. In this context, DV stands for "Volume Distribution" and 0.97 represents the cumulative volume percentage. Specifically, DV0.97 means that in the particle size distribution, 97% of the volume of the particles is smaller than a certain particle size. This parameter can be used to measure the breadth of the particle size distribution, that is, in a particle group, the maximum size of the vast majority of particles (97% volume) will not exceed the value represented by DV0.97. For example, in the application of fine water mist fire extinguishing systems, DV0.97 can be used to define the size of water mist droplets to ensure that 97% of the droplet diameter does not exceed a certain value, such as 1000 microns (μm), thereby ensuring the fire extinguishing effect and performance of the fine water mist system.

[0060] In summary, the atomizing nozzle of the present application can spray droplets with a DV0.50 of less than 40μm and a DV0.97 of less than 70μm when the gas pressure is 0.3MPa-0.35MPa and the water flow rate is about 1L / min. It meets the droplet requirements of DV0.50 less than 200μm and DV0.99 less than 400μm specified in GB50898 "Technical Specifications for Fine Water Mist Fire Extinguishing Systems". After the droplets sprayed by the atomizing nozzle of the present application enter the fire scene, they can quickly absorb heat and vaporize, cooling the fire scene while the water vapor generated reduces the oxygen content in the air, creating a local inert oxygen environment, and realizing three-dimensional full flooding concentration fire extinguishing, rather than flat covering fire extinguishing, which is conducive to suffocation fire extinguishing. In addition, the gas consumption and water consumption of the atomizing nozzle of the present application are greatly reduced, which not only has obvious energy-saving and environmental protection effects, but also the reduction in water consumption is conducive to protecting the internal structure of the building and reducing the secondary damage of water stains to the building.

[0061] 1-2 , in one embodiment, the inner diameter of the liquid inlet hole 31 is smaller than the inner diameter of the liquid outlet hole 32 , so that the atomized liquid sprayed through the liquid outlet hole 32 can have a larger spray area.

[0062] In one embodiment, the first connecting channel 23 includes a first air inlet hole 231 and a second air inlet hole 232, the distance between the first air inlet hole 231 and the liquid inlet hole 31 is greater than the distance between the second air inlet hole 232 and the liquid inlet hole 31, and the aperture of the first air inlet hole 231 is greater than the aperture of the second air inlet hole 232. The inverted conical first connecting channel 23 achieves a gathering effect on gas.

[0063] Specifically, the first connecting channel 23 is an inverted cone-shaped channel. The gas blown into the annular resonance groove 21 can enter the first connecting channel 23 through the first air inlet hole 231 with a larger aperture, and be output to the second connecting channel 24 through the first air inlet hole 231 with a smaller aperture, so as to achieve the gas gathering effect.

[0064] 1-2 , in one embodiment, the aperture of the first air inlet 231 is consistent with the inner diameter of the annular resonant slot 21. Specifically, the first air inlet 231 and the annular resonant slot 21 are both provided on the side of the resonator 2 facing the deflector 4, so that the gas blown into the annular resonant slot 21 can quickly enter the first air inlet 231 and be output through the first connecting channel 23 while reasonably utilizing the side space of the resonator 2 facing the deflector 4.

[0065] In one embodiment, the aperture of the second air inlet 232 is consistent with the aperture of the liquid inlet 31. After the subsonic airflow output through the second air inlet 232 atomizes the liquid in the second connecting channel 24, the atomized liquid can be blown into the liquid inlet 31 in a relatively concentrated state, thereby ensuring the output effect of the atomized liquid.

[0066] That is, if the aperture of the second air inlet hole 232 is larger than the aperture of the liquid inlet hole 31, part of the atomized liquid will be blown to the side of the liquid outlet pipe 3 facing the second air inlet hole 232, resulting in waste of atomized liquid. If the aperture of the second air inlet hole 232 is smaller than the aperture of the liquid inlet hole 31, part of the liquid will flow into the liquid outlet pipe 3 without being atomized by the impact of the subsonic airflow, thereby affecting the atomization effect.

[0067] Referring to FIGS. 1 to 3 , in one embodiment, the second connecting channel 24 includes a connecting slit 241 and an auxiliary channel 242. The auxiliary channel 242 is disposed on the liquid outlet pipe 3 and communicates with the liquid inlet 22. The connecting slit 241 is located between the liquid outlet pipe 3 and the first connecting channel 23 and communicates with the auxiliary channel 242. The liquid in the liquid inlet 22 can flow into the connecting slit 241 through the auxiliary channel 242 to be impacted and atomized by the subsonic airflow in the connecting slit 241.

[0068] Specifically, an annular groove is provided on the outer circumference of the liquid outlet pipe 3, and a plurality of shunt channels connecting the connecting gap 241 and the annular groove are provided on the liquid outlet pipe 3, and the auxiliary channel 242 is formed by the cooperation of the annular groove and the plurality of shunt channels. More specifically, the annular groove is coaxial with the liquid outlet pipe 3, and the plurality of shunt channels are evenly arranged on the liquid outlet pipe 3 around the axial direction of the liquid outlet pipe 3, and the axial ends of the plurality of shunt channels are respectively connected with the annular groove and the connecting gap 241. The liquid in the liquid inlet 22 can flow into the plurality of shunt channels through the annular groove, and be evenly input into the connecting gap 241 through the plurality of shunt channels, so as to be impacted and atomized by the subsonic airflow in the connecting gap 241.

[0069] Referring to Figures 1 and 2, in one embodiment, the ratio of the width a of the annular gap 5 to the wavelength λ of the sound wave at the gas operating frequency is in the range of 0.015-0.03. According to tests, within this ratio range, the droplet diameter and particle size distribution characteristics of the atomizing nozzle can reach the droplet diameter and particle size distribution characteristics specified in GB50898 "Technical Specifications for Fine Water Mist Fire Extinguishing Systems".

[0070] That is, since the diameter of the droplets is different due to the sound wave wavelength λ under different gas operating frequencies, the above formula can be used to change the length a of the annular gap 5 by adjusting the sound wave wavelength under the gas operating frequency, so that the diameter of the droplets sprayed by the nozzle falls within the range of droplet diameters with good fire extinguishing effect.

[0071] In one embodiment, the ratio of the height h of the annular resonant groove 21 along the annular gap 5 to the width a of the annular gap is in the range of 1.5-2.5. According to tests, within this ratio range, the droplet diameter and particle size distribution characteristics of the mist sprayed by the atomizing nozzle can reach the droplet diameter and particle size distribution characteristics specified in GB50898 "Technical Specifications for Fine Water Mist Fire Extinguishing Systems".

[0072] In one embodiment, the ratio of the cross-sectional area of ​​the annular gap 5 to the cross-sectional area of ​​the liquid inlet hole 31 is in the range of 1.7-1.8 along the axial direction perpendicular to the annular gap 5. According to tests, when the ratio of the cross-sectional area of ​​the annular gap 5 to the cross-sectional area of ​​the liquid inlet hole 31 is in the range of 1.7-1.8, the droplet diameter and particle size distribution characteristics of the atomizing nozzle can reach the droplet diameter and particle size distribution characteristics specified in GB50898 "Technical Specifications for Fine Water Mist Fire Extinguishing Systems" and also have a good fire extinguishing effect.

[0073] To verify the above range, the present application changes the cross-sectional area of ​​the annular gap 5 while keeping the cross-sectional area of ​​the liquid inlet hole 31 unchanged, so that the ratio range between the cross-sectional area of ​​the annular gap 5 and the cross-sectional area of ​​the liquid inlet hole 31 is reduced by 15% (ΔSi(-15%), 1.7-1.8 (the upper and lower limits of the ratio are 1.7 and 1.8, respectively) and the upper limit of the ratio is increased by 15% (ΔSi(+15%), respectively. The flow rate Q, range H, frequency f and droplet size of the atomizing nozzle are tested and compared, and the flow rate, range, frequency and particle size change comparison diagrams as shown in Figures 6 to 9 are obtained.

[0074] According to the above comparison chart, when the upper limit of the ratio 1.8 is enlarged by 15%, the flow rate will increase significantly, but the range and frequency will decrease greatly, and the droplet size will be doubled, which will affect the fire extinguishing effect. When the lower limit of the ratio 1.7 is reduced by 15%, the flow rate, range and frequency will decrease significantly, and the droplet size will be about 20% smaller than the original, which will also affect the fire extinguishing effect. Therefore, when the ratio between the cross-sectional area of ​​the annular gap 5 and the cross-sectional area of ​​the liquid inlet 31 is in the range of 1.7-1.8, the flow rate, range, frequency and particle size are all within a relatively suitable range, and the atomizing nozzle has the best fire extinguishing effect.

[0075] It is worth mentioning that the above tests were conducted under the same external working conditions. Although the droplet size can be reduced by increasing the gas pressure, this will increase the energy consumption of the external equipment and thus increase the cost.

[0076] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0077] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. An atomizing nozzle, characterized in that: include: case; A deflector is disposed inside the shell, and an annular gap is provided between the shell and the deflector; A resonator is arranged on the housing and is located downstream of the deflector. The resonator is provided with an annular resonance groove coaxial with the annular gap, and the notch of the annular resonance groove is arranged toward the annular gap. The resonator is also provided with a liquid inlet and a first connecting channel, and the first connecting channel is coaxial with and communicated with the annular gap. a liquid outlet pipe, arranged on the resonator and coaxial with the annular gap, a second connecting channel being provided between the liquid outlet pipe and the resonator, and the liquid outlet pipe, the liquid inlet and the first connecting channel being interconnected through the second connecting channel; Among them, the liquid outlet pipe has a liquid inlet hole and a liquid outlet hole, and the liquid inlet hole connects the second connecting channel and the liquid outlet hole, the cross-sectional area of ​​the annular gap perpendicular to the axial direction of the shell is larger than the cross-sectional area of ​​the liquid inlet hole perpendicular to the axial direction of the shell, and along the direction perpendicular to the axial direction of the annular gap, the ratio between the cross-sectional area of ​​the annular gap and the cross-sectional area of ​​the liquid inlet hole is in the range of 1.7-1.

8.

2. The atomizing nozzle according to claim 1, characterized in that: The inner diameter of the liquid inlet hole is smaller than the inner diameter of the liquid outlet hole.

3. The atomizing nozzle according to claim 1, characterized in that: The first connecting channel includes a first air inlet hole and a second air inlet hole, the distance between the first air inlet hole and the liquid inlet hole is greater than the distance between the second air inlet hole and the liquid inlet hole, and the aperture of the first air inlet hole is greater than the aperture of the second air inlet hole.

4. The atomizing nozzle according to claim 3, characterized in that: The aperture of the first air inlet hole is consistent with the inner diameter of the annular resonance slot.

5. The atomizing nozzle according to claim 3, characterized in that: The aperture of the second air inlet hole is consistent with the aperture of the liquid inlet hole.

6. The atomizing nozzle according to claim 1, characterized in that: The resonator is provided with a mounting groove, the liquid outlet pipe is inserted in the mounting groove, the second connecting channel includes a connecting gap and an auxiliary channel, the auxiliary channel is arranged on the liquid outlet pipe and is connected with the liquid inlet, the connecting gap is located between the liquid outlet pipe and the first connecting channel, and the connecting gap is connected with the auxiliary channel.

7. The atomizing nozzle according to claim 6, characterized in that: An annular groove is arranged on the outer peripheral surface of the liquid outlet pipe, and a plurality of diversion channels connecting the connection gap and the annular groove are arranged on the liquid outlet pipe. The annular groove and the plurality of diversion channels cooperate to form the auxiliary channel.

8. The atomizing nozzle according to claim 7, characterized in that: The annular groove is coaxial with the liquid outlet pipe, a plurality of the diversion channels are evenly arranged on the liquid outlet pipe around the axial direction of the liquid outlet pipe, and axial ends of the plurality of the diversion channels are respectively connected with the annular groove and the connecting gap.

9. The atomizing nozzle according to claim 1, characterized in that: The ratio of the width a of the annular gap to the wavelength λ of the sound wave at the working frequency of the gas is in the range of 0.015-0.

03.

10. The atomizing nozzle according to claim 9, characterized in that: The ratio of the height h of the annular resonant slot to the width a of the annular gap is in the range of 1.5-2.5.

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