A gas assisted atomizing nozzle and a sprayer thereof

Abstract

The application discloses a gas-assisted atomizing nozzle and a sprayer thereof, which comprises a rear cover body, an intermediate sleeve and a front sleeve, an annular air cavity is formed between the intermediate sleeve and a center liquid pipe, a peripheral liquid cavity is formed between the front sleeve and a conical cylinder section, an inner ring liquid cavity is formed between the end of the conical cylinder section and the inner surface of a cover plate, compressed air enters a nozzle outlet area through the annular air cavity, liquid enters the nozzle outlet area through the center liquid cavity and the peripheral liquid cavity respectively, and the compressed air and the liquid are mixed and atomized in the nozzle outlet area and sprayed to the outside space. Through the structural design of the nozzle, the liquid passes through two liquid flow channels in the nozzle to form a multi-liquid-hole axial jet and an annular radial jet respectively, the compressed air passes through the nozzle to form an axial high-speed airflow, and the axial high-speed airflow forms multi-liquid-hole coaxial mixed atomization and non-coaxial mixed atomization with the multi-liquid-hole axial jet and the annular radial jet respectively, so that the goals of large spraying flow, small droplet size and low energy consumption are achieved.

Description

Technical Field

[0001] This invention relates to the field of spraying, and more particularly to a gas-assisted atomizing nozzle and its sprayer. Background Technology

[0002] Gas-assisted atomizing nozzles and sprayers are widely used in pesticide spraying, disinfection, and drying. Pesticides and other liquids are atomized into fine droplets through gas-assisted atomizing nozzles. Driven by a high-speed airflow, these droplets deposit on surfaces, effectively killing pests and bacteria. Furthermore, the atomization function of gas-assisted atomizing nozzles can also promote the drying of solutions, achieving spray drying. A gas-assisted atomizing nozzle is a nozzle component that uses compressed air to assist in liquid atomization. The liquid and compressed air collide and break up inside and outside the nozzle, producing a fine atomization. Sprayers using this type of nozzle are characterized by good atomization effect, small droplet size, and long range.

[0003] Currently, gas-assisted atomizing nozzles are divided into two types: internal mixing and external mixing. In internal mixing nozzles, the gas-liquid mixing zone is located inside the nozzle, generating droplets through pressure atomization. In external mixing nozzles, the gas-liquid mixing zone is located outside the nozzle, primarily atomizing the liquid through high-speed compressed air flow, forming a two-phase flow composed of high-speed airflow and droplets. Patent document CN201910669205.1 discloses an external mixing inductive electrostatic atomizing nozzle. It utilizes compressed air to generate an axial central airflow and an outer annular airflow. Liquid passes through the annular axial flow channel to form an annular axial liquid flow. After expansion, the central airflow, together with the annular axial liquid flow and the outer annular airflow, forms coaxial pneumatic mixing atomization. The spray shape is a hollow cone. This nozzle has a relatively narrow and long flow channel, resulting in high resistance in both the air and liquid flow channels, high compressed air pressure, and a relatively low spray flow rate. Because the central airflow mixes with the annular axial liquid flow after expansion, the gas velocity is relatively low, leading to a relatively poor atomization effect and relatively large droplet size.

[0004] Most existing external mixing airflow-assisted atomizing nozzles adopt a single liquid flow channel type. The liquid flow channel is generally a central axial flow channel or annular axial flow channel. The liquid forms a single-hole axial jet or annular axial liquid flow through the liquid flow channel. The cross-sectional dimensions of the liquid flow channel and the air flow channel are very small, and the flow channel is long and narrow. The compressed air resistance is generally large, and the compressed air pressure is mostly above 0.1MPa. The spray flow rate is generally small, mostly below 200 ml per minute. This results in problems such as high compressed air energy consumption, poor atomization performance, small fog cone angle and low operating efficiency, thus reducing the efficiency of spraying operations. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a gas-assisted atomizing nozzle, which is a dual-liquid-channel external mixing gas-assisted atomizing nozzle. Through the nozzle's structural design, liquid flows through the two internal liquid channels to form a multi-hole axial jet and an annular radial jet, respectively. Simultaneously, compressed air passes through the nozzle to form a high-speed axial airflow. The high-speed axial airflow and the multi-hole axial jet and annular radial jet respectively form multi-hole coaxial mixing atomization and non-coaxial mixing atomization.

[0006] The present invention achieves the above-mentioned technical objectives through the following technical means.

[0007] A gas-assisted atomizing nozzle includes a rear cover, an intermediate sleeve, and a front sleeve; the front sleeve has a nozzle center hole; the intermediate sleeve includes a cylindrical section and a conical section; the rear cover includes a nozzle rear cover and a central liquid tube.

[0008] The conical section mates with the front sleeve, and the cylindrical section mates with the nozzle rear cover; the outlet end of the central liquid pipe is tapered and is located inside the conical section.

[0009] An air inlet is provided on the cylindrical section. Gas enters the annular air cavity formed by the central liquid pipe and the cylindrical section through the air inlet and is then ejected from the central hole of the nozzle.

[0010] The front sleeve is provided with a liquid inlet hole. A portion of the liquid enters the outer liquid cavity and inner ring liquid cavity formed by the front sleeve and the conical section through the liquid inlet hole and is then ejected from the center hole of the nozzle.

[0011] A portion of the liquid enters the central liquid tube through the nozzle cover, then passes through the central liquid outlet holes evenly distributed at the end of the central liquid tube, and is ejected from the central hole of the nozzle.

[0012] In the above scheme, an annular groove is provided at the end of the cone section, and the inner circle of the annular groove is the inner ring surface of the annular groove; the inlet end and outlet end of the annular groove are the end face of the annular groove and the end face of the cone, respectively, and several radial guide plates are evenly distributed on the end face of the cone.

[0013] In the above scheme, the front sleeve includes a connecting sleeve and a cover plate. The connecting sleeve has a liquid inlet hole, the cover plate has a nozzle center hole, and a diffuser hole is formed outside the nozzle center hole. The area between the diffuser holes is the nozzle outlet area.

[0014] In the above scheme, the outlet end of the central liquid pipe has a conical structure, the cone angle of the conical structure is the cone angle of the front end of the central liquid pipe, the cone angle of the conical pipe section is the inner cone angle of the conical section, and the diffusion angle of the diffuser hole is the diffusion angle of the diffuser hole; wherein, the inner cone angle of the conical section is greater than the cone angle of the front end of the central liquid pipe, and the inner cone angle of the conical section and the diffusion angle of the diffuser hole satisfy the following relationship:

[0015] θ1≤45°

[0016] θ3≥1.5θ1

[0017] In the formula, θ1 is the inner cone angle of the cone section, in degrees; θ3 is the diffusion angle of the diffusion hole, in degrees.

[0018] In the above scheme, an inner extension tube is provided on the inner side of the outlet end of the front sleeve; the outer ring of the inner extension tube is the outer annular surface of the inner extension tube, and the end face of the inner extension tube away from the outlet end of the front sleeve is the end face of the inner extension tube.

[0019] In the above scheme, the outer annular surface of the inner tube is placed inside the outer annular surface of the annular groove; the inner annular liquid cavity includes a radial guiding cavity, an axial guiding cavity, and an annular jet cavity, wherein the cover plate and the end face of the cone form the radial guiding cavity, the outer annular surface of the annular groove and the outer annular surface of the inner tube form the axial guiding cavity, and the end face of the inner tube and the end face of the annular groove form the annular jet cavity; the radial guiding cavity, the axial guiding cavity, and the annular jet cavity are connected.

[0020] In the above scheme, the annular jet cavity is constricted from the outside to the inside, the width of the annular jet cavity is the internal axial width of the annular jet cavity, the diameter of the nozzle center hole is larger than the inner diameter of the end of the cone section, and the width of the annular jet cavity satisfies the following relationship:

[0021] 5D 0.5 ≤t<d2

[0022] In the formula, t is the width of the annular jet cavity in millimeters; d2 is the diameter of the central liquid outlet in millimeters; d3 is the inner diameter of the end of the cone section; d4 is the diameter of the nozzle's central hole; and D... 0.5 - The median diameter of the spray droplets from the nozzle, in millimeters.

[0023] In the above scheme, a central liquid cavity is formed inside the central liquid tube; the end of the central liquid tube is the front end of the central liquid tube, and a central liquid outlet is formed at the front end of the central liquid tube, with the central liquid cavity communicating with the central liquid outlet; wherein, the diameter of the central liquid outlet is the same as D. 0.5 The relation is:

[0024] d2≥10D 0.5

[0025] In the formula, d2 is the diameter of the central outlet hole, and D is the diameter of the central outlet hole. 0.5 - The median diameter of the spray droplets from the nozzle.

[0026] In the above scheme, the inner diameter of the cylindrical section is larger than the outer diameter D1 of the central liquid pipe, and the inner diameter of the cylindrical section and the outer diameter of the central liquid pipe satisfy the following relationship: d1≥4D1;

[0027] The inner diameter of the end of the conical section is larger than the outer diameter of the central liquid tube, and the inner diameter of the end of the conical section satisfies the following relationship:

[0028]

[0029] In the formula, d1 is the inner diameter of the cylindrical section in millimeters, D1 is the outer diameter of the central liquid tube in millimeters, and d3 is the inner diameter of the end of the conical section in millimeters.

[0030] Q - Compressed air volumetric flow rate at the air inlet, in cubic meters per second;

[0031] L-Nozzle design range, in meters;

[0032] V - Axial high-speed airflow velocity at the design range L, in meters per second;

[0033] k - correction factor, k = 12~20;

[0034] When the range L≥4, the value of k is 16≤k≤20; when the range L<4, the value of k is 12≤k<16.

[0035] A sprayer comprising a gas-assisted atomizing nozzle.

[0036] Beneficial effects:

[0037] 1. The gas-assisted atomizing nozzle provided by this invention features low compressed air pressure, high spray flow rate, small droplet size, and large mist cone angle, thereby improving liquid atomization efficiency and reducing compressed air energy consumption. Under the same spray volume and operating time conditions, the gas-assisted atomizing nozzle and sprayer provided by this invention have higher operating efficiency and lower power consumption, achieving the goal of energy conservation and emission reduction. Furthermore, the gas-assisted atomizing nozzle provided by this invention also features simple structure, high reliability, and ease of use, making it suitable for multiple fields such as pesticide spraying, disinfection, and drying.

[0038] 2. In this invention, the liquid passes through two liquid channels inside the nozzle to form a multi-hole axial jet and an annular radial jet, respectively. The multi-hole axial jet solves the problems of small gas-liquid contact area, small spray flow rate, and low atomization performance of the traditional single-hole axial jet. The annular radial jet further increases the gas-liquid contact area and spray flow rate of the nozzle, and improves atomization performance. Compressed air passes through the nozzle to form a high-speed axial airflow. The high-speed axial airflow forms coaxial and non-coaxial mixed atomization with the multi-hole axial jet and the annular radial jet, respectively. The nozzle provided by this invention simultaneously forms these two mixed atomization modes, greatly increasing the gas-liquid contact area, increasing the spray flow rate of the nozzle, and improving the atomization performance of the nozzle. This makes the nozzle have the characteristics of large spray flow rate, small droplet size, large spray cone angle, and large adjustable flow range.

[0039] 3. The nozzle designed in this invention has a tapered section with a gradually narrowing internal cross-section. The compressed air has the highest flow velocity near the end face of the tapered section and the center hole of the nozzle. At the same time, the liquid jet also mixes and atomizes with the compressed air at this location, making full use of the atomization capability of the axial high-speed airflow, improving the atomization efficiency of the compressed air, and reducing the compressed air pressure and energy consumption required by the nozzle. Attached Figure Description

[0040] Figure 1 This is a schematic diagram of a gas-assisted atomizing nozzle according to an embodiment of the present invention;

[0041] Figure 2 for Figure 1 A magnified view of a portion of the image;

[0042] Figure 3 for Figure 1 A schematic diagram of the rear cover structure involved in the process;

[0043] Figure 4 for Figure 3 A magnified view of a portion of the image;

[0044] Figure 5 for Figure 1 A axial section view of the intermediate sleeve involved in the process;

[0045] Figure 6 for Figure 5 A magnified view of a portion of the image;

[0046] Figure 7 for Figure 1 A axial section view of the front sleeve involved in the process;

[0047] Figure 8 for Figure 7 A magnified view of a portion of the image.

[0048] Figure label:

[0049] 1-Rear cover body, 11-Nozzle rear cover, 12-Central liquid tube, 13-Central liquid inlet, 14-Central liquid cavity, 15-Central liquid outlet, 121-Front end of central liquid tube, 122-Outer diameter of central liquid tube, 123-Conical angle of front end of central liquid tube, 151-Diameter of central liquid outlet; 2-Intermediate sleeve, 21-Cylindrical section, 22-Conical section, 23-Air inlet, 24-Annular air cavity, 211-Inner diameter of cylindrical section, 221-End face of conical section, 222-Radial guide plate, 223-Inner annular groove surface, 224-Annular groove, 225-End face of annular groove, 226-Inner circle of conical section Cone angle; 227-inner diameter of the cone section end; 228-axial height of the radial guide plate; 3-front sleeve; 31-connecting sleeve; 32-cover plate; 33-nozzle center hole; 34-nozzle outlet area; 35-peripheral liquid inlet hole; 36-peripheral liquid cavity; 37-inner annular liquid cavity; 321-inner surface of cover plate; 331-diffuser hole; 332-outer annular surface of inner extension tube; 333-end face of inner extension tube; 334-inner extension tube; 335-diameter of nozzle center hole; 336-diffuser hole diffusion angle; 371-radial guide cavity; 372-axial guide cavity; 373-annular jet cavity; 374-width of annular jet cavity. Detailed Implementation

[0050] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0051] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "axial," "radial," "vertical," "horizontal," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. In this invention, unless otherwise expressly specified and limited, the terms "installed," "connected," "joined," "fixed," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components. For those skilled in the art, the specific meaning of the above terms in this invention can be understood according to the specific circumstances.

[0052] As shown in the accompanying drawings, one embodiment of the gas-assisted atomizing nozzle of the present invention includes a rear cover 1, an intermediate sleeve 2, and a front sleeve 3. The rear cover 1 includes a nozzle rear cover 11 and a central liquid tube 12. The intermediate sleeve 2 includes a cylindrical section 21 and a conical section 22. The front sleeve 3 includes a connecting sleeve 31 and a cover plate 32. The nozzle rear cover 11 has a central liquid inlet hole 13 inside, and the central liquid tube 12 has a central liquid cavity 14 inside. The central liquid cavity 14 is connected to an external liquid inlet pipe through the central liquid inlet hole 13. The central liquid tube 12 has a tubular structure, and the central axis of the central liquid cavity 14 coincides with the central axis of the central liquid tube 12. The front end 121 of the central liquid tube has a conical closed structure and has several central liquid outlet holes 15.

[0053] The intermediate sleeve 2 has a thin-walled cylindrical section 21 with an air inlet 23 on its wall. The end of the intermediate sleeve 2 is a conical section 22 with a tapered internal cross-section and a conical end face 221. The connecting sleeve 31 of the front sleeve 3 is a cylindrical structure with an external liquid inlet 35 on its wall. The cover plate 32 is located at the end of the front sleeve 3 and is a circular plate perpendicular to the central axis of the connecting sleeve 31. The center of the cover plate 32 has a nozzle center hole 33, the central axis of which coincides with the central axis of the conical section 22. The internal space of the nozzle center hole 33 is the nozzle outlet area 34.

[0054] The central liquid tube 12 extends into the interior of the intermediate sleeve 2, and an annular air cavity 24 is formed between the inner surface of the intermediate sleeve 2 and the outer surface of the central liquid tube 12. The conical section 22 extends into the interior of the front sleeve 3, and the end face 221 of the conical section is close to the central hole 33 of the nozzle. An outer liquid cavity 36 is formed between the inner surface of the front sleeve 3 and the outer surface of the conical section 22. An inner annular liquid cavity 37 is formed between the end of the conical section 22 and the inner surface 321 of the cover plate. The outer liquid cavity 36 surrounds the inner annular liquid cavity 37.

[0055] Compressed air enters the nozzle exit region 34 sequentially through the air inlet 23 and the annular air cavity 24, forming an axial high-speed airflow in the nozzle exit region 34. A portion of the liquid enters the nozzle exit region 34 sequentially through the central liquid inlet 13, the central liquid cavity 14, and the central liquid outlet 15, forming a multi-hole axial jet in the nozzle exit region 34. Another portion of the liquid enters the nozzle exit region 34 sequentially through the peripheral liquid inlet 35, the peripheral liquid cavity 36, and the inner annular liquid cavity 37, forming an annular radial jet in the nozzle exit region 34. The axial high-speed airflow and the multi-hole axial jet form a coaxial mixing atomization in the nozzle exit region, while the axial high-speed airflow and the annular radial jet form a non-coaxial mixing atomization in the nozzle exit region and are sprayed into the external space.

[0056] Combination Figures 1 to 4As shown, according to this embodiment, the central axis of the central liquid tube 12 coincides with the central axis of the conical section 22. The front end 121 of the central liquid tube is close to the central hole 33 of the nozzle. The central liquid cavity 14 is cylindrical in shape. The front end 121 of the central liquid tube has several circumferentially evenly distributed central liquid outlet holes 15. The central liquid cavity 14 is connected to the nozzle outlet area 34 through the central liquid outlet holes 15. The central axis of the central liquid outlet hole 15 is parallel to the central axis of the central liquid cavity 14. The diameter 151 of the central liquid outlet hole satisfies the following relationship:

[0057] d2≥10D 0.5

[0058] In the formula, d2 is the diameter of the central liquid outlet hole, in millimeters;

[0059] D 0.5 It is the median diameter of the spray droplets from the nozzle, measured in millimeters.

[0060] Combined with appendix Figure 1 , 2 As shown in Figures 5 and 6, according to this embodiment, the cone end face 221 is perpendicular to the central axis of the cone section 22. The cone end face 221 has a plurality of circumferentially uniformly distributed radial guide plates 222, and a plurality of circumferentially uniformly distributed radial guide cavities 371 are formed between the radial guide plates 222. The cone end face 221 is in contact with the inner surface 321 of the cover plate, and the axial height 228 of the radial guide plates satisfies the following relationship:

[0061] 40D 0.5 ≤h≤60D 50

[0062] In the formula, h is the axial height of the radial guide vane, in millimeters, and D... 0.5 It is the median diameter of the spray droplets from the nozzle, measured in millimeters.

[0063] The radial guide plate 222 is located on the outer edge of the cone end face 221. The radial guide plate 222 is in the shape of a straight blade. The inner edge of the cone end face 221 has an annular groove 224. The annular groove 224 is close to the central liquid outlet hole 15. The central axis of the inner annular surface 223 of the annular groove coincides with the central axis of the cone section 22. The annular groove end face 225 is perpendicular to the central axis of the cone section 22.

[0064] like Figure 1 , Figure 2 and Figure 3 As shown, according to this embodiment, the inner diameter 211 of the cylindrical section is greater than the outer diameter 122 of the central liquid pipe, and the inner diameter 211 of the cylindrical section and the outer diameter 122 of the central liquid pipe satisfy the following relationship: d1≥4D1.

[0065] The inner diameter 227 at the end of the conical section is greater than the outer diameter 122 of the central liquid tube, and the inner diameter 227 at the end of the conical section satisfies the following relationship:

[0066]

[0067] In the formula, d1 is the inner diameter of the cylindrical section in millimeters, D1 is the outer diameter of the central liquid tube in millimeters, and d3 is the inner diameter of the end of the conical section in millimeters.

[0068] Q is the compressed air volumetric flow rate at the air inlet, measured in cubic meters per second;

[0069] L is the design range of the nozzle, measured in meters;

[0070] V is the axial high-speed airflow velocity at the designed range L, measured in meters per second;

[0071] k is the correction factor, k = 12 to 20;

[0072] When the range L≥4, the value of k is 16≤k≤20; when the range L<4, the value of k is 12≤k<16.

[0073] Combined with appendix Figure 7 and 8 As shown, according to this embodiment, the nozzle center hole 33 includes an inner tube 334 and a diffuser hole 331. The inner tube 334 is a tubular structure extending from the inner edge of the nozzle center hole 33 toward the central liquid tube 12. The inner tube 334 is located inside the annular groove 224. An axial flow guide cavity 372 is formed between the outer annular surface 332 of the inner tube and the inner annular surface 223 of the annular groove. An annular jet cavity 373 is formed between the end face 333 of the inner tube and the end face 225 of the annular groove. The annular jet cavity 373 surrounds the nozzle outlet region 34. The inner annular liquid cavity 37 includes a radial flow guide cavity 371, an axial flow guide cavity 372, and an annular jet cavity 373. The outer liquid cavity 36 is connected to the nozzle outlet region 34 through the inner annular liquid cavity 37.

[0074] Combined with appendix Figure 1-8 As shown, according to this embodiment, the annular jet cavity 373 is constricted from the outside to the inside, and the width of the annular jet cavity 374 is the internal axial width of the annular jet cavity 373. The diameter of the nozzle center hole 335 is greater than the inner diameter 227 of the end of the cone section. The width of the annular jet cavity 374 satisfies the following relationship:

[0075] 5D 0.5 ≤t<d2

[0076] In the formula, t is the width of the annular jet cavity in millimeters; d2 is the diameter of the central liquid outlet in millimeters; d3 is the inner diameter of the end of the cone section; d4 is the diameter of the nozzle's central hole; and D... 0.5- The median diameter of the spray droplets from the nozzle, in millimeters.

[0077] The inner cone angle 226 of the conical section is greater than the front cone angle 123 of the central liquid tube. The inner cone angle 226 of the conical section and the diffusion angle 336 of the diffuser hole satisfy the following relationship:

[0078] θ1≤45°

[0079] θ3≥1.5θ1

[0080] In the formula, θ1 is the inner cone angle of the cone section, in degrees; θ3 is the diffusion angle of the diffusion hole, in degrees.

[0081] The nozzle rear cover 11 of the rear cover body 1 and the cylindrical section 21 of the intermediate sleeve 2 are connected by a sealing thread. The cylindrical section 21 of the intermediate sleeve 2 and the connecting sleeve 31 of the front sleeve 3 are connected by a sealing thread. The central liquid inlet hole 13 and the peripheral liquid inlet hole 35 are both connected to the external liquid inlet pipe by a sealing thread. The air inlet hole 23 and the external compressed air pipe are connected by a sealing thread.

[0082] Example 2

[0083] A sprayer comprising the gas-assisted atomizing nozzle described in Example 1, and thus having the beneficial effects of Example 1, which will not be repeated here.

[0084] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0085] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention without departing from the principles and spirit of the present invention.

Claims

1. A gas-assisted atomizing nozzle, characterized in that, It includes a rear cover (1), an intermediate sleeve (2) and a front sleeve (3); the front sleeve (3) has a nozzle center hole (33); the intermediate sleeve (2) includes a cylindrical section (21) and a conical section (22); the rear cover (1) includes a nozzle rear cover (11) and a central liquid tube (12). Among them, the conical section (22) is fitted with the front sleeve (3), and the cylindrical section (21) is fitted with the nozzle rear cover (11); the outlet end of the central liquid pipe (12) is tapered, and the outlet end of the central liquid pipe (12) is placed inside the conical section (22); An air inlet (23) is provided on the cylindrical section (21). Gas enters the annular air cavity (24) formed by the central liquid pipe (12) and the cylindrical section (21) through the air inlet (23) and is then ejected from the central hole (33) of the nozzle. The front sleeve (3) is provided with an inlet hole (35). A portion of the liquid enters the outer liquid cavity (36) and inner ring liquid cavity (37) formed by the front sleeve (3) and the cone section (22) through the inlet hole (35) and is then ejected from the nozzle center hole (33). Another portion of the liquid enters the central liquid pipe (12) through the nozzle rear cover (11) and then passes through the central outlet holes (15) evenly distributed at the end of the central liquid pipe (12) before being ejected from the nozzle center hole (33). The inner ring liquid cavity (37) includes a radial flow guide cavity (371), an axial flow guide cavity (372), and an annular jet cavity (373). The cover plate (32) and the cone end face (221) form a radial flow guide. The radial flow guide cavity (371), the outer annular surface (223) of the annular groove and the outer annular surface (332) of the inner tube form an axial flow guide cavity (372), and the end face (333) of the inner tube and the end face (225) of the annular groove form an annular jet cavity (373); the radial flow guide cavity (371), the axial flow guide cavity (372) and the annular jet cavity (373) are connected; the annular jet cavity (373) is constricted from the outside to the inside, the width (374) of the annular jet cavity is the internal axial width of the annular jet cavity (373), the diameter (335) of the nozzle center hole is greater than the inner diameter (227) of the end of the cone section, and the width (374) of the annular jet cavity satisfies the following relationship: In the formula, t is the width of the annular jet cavity, in millimeters; - Diameter of the center outlet hole, in millimeters; d3 - Inner diameter of the cone section end; d4 - Diameter of the nozzle center hole; D 0.5 - The median diameter of the spray droplets from the nozzle, in millimeters.

2. The gas-assisted atomizing nozzle according to claim 1, characterized in that, The cone section (22) has an annular groove (224) at its end, and the inner ring of the annular groove (224) is the inner annular surface (223). The inlet end and outlet end of the annular groove (224) are the annular groove end face (225) and the cone end face (221) respectively. Several radial guide plates (222) are evenly distributed on the cone end face (221).

3. The gas-assisted atomizing nozzle according to claim 1, characterized in that, The front sleeve (3) includes a connecting sleeve (31) and a cover plate (32). The connecting sleeve (31) has an inlet hole (35), and the cover plate (32) has a nozzle center hole (33). A diffuser hole (331) is provided on the outside of the nozzle center hole (33). The area between the diffuser holes (331) is the nozzle outlet area (34).

4. The gas-assisted atomizing nozzle according to claim 1, characterized in that, The outlet end of the central liquid pipe (12) has a conical structure. The cone angle of the conical structure is the cone angle (123) at the front end of the central liquid pipe, the cone angle of the conical pipe section is the cone angle (226) inside the conical section, and the diffusion angle of the diffusion hole (331) is the diffusion angle (336). Among them, the cone angle (226) inside the conical section is greater than the cone angle (123) at the front end of the central liquid pipe. The cone angle (226) inside the conical section and the diffusion angle (336) of the diffusion hole satisfy the following relationship: , In the formula, - The cone angle inside the conical section, in degrees; - Diffusivity angle of the diffuser hole, in degrees.

5. The gas-assisted atomizing nozzle according to any one of claims 1 to 4, characterized in that, An inner extension tube (334) is provided on the inner side of the outlet end of the front sleeve (3); the outer ring of the inner extension tube (334) is the outer ring surface (332) of the inner extension tube, and the end face of the inner extension tube (334) away from the outlet end of the front sleeve is the end face (333) of the inner extension tube.

6. The gas-assisted atomizing nozzle according to claim 5, characterized in that, The outer annular surface (332) of the inner tube is placed within the inner annular surface (223) of the annular groove; the inner diameter (211) of the cylindrical section is larger than the outer diameter (122) of the central liquid tube, and the inner diameter (211) of the cylindrical section and the outer diameter (122) of the central liquid tube satisfy the following relationship: .

7. The gas-assisted atomizing nozzle according to claim 1, characterized in that, A central liquid cavity (14) is provided inside the central liquid tube (12); the end of the central liquid tube (12) is the central liquid tube front end (121), and a central liquid outlet (15) is provided at the central liquid tube front end (121). The central liquid cavity (14) communicates with the central liquid outlet (15); wherein, the diameter (151) of the central liquid outlet is the same as that of D. 0.5 The relation is: In the formula, d2 is the diameter of the central outlet hole, and D is the diameter of the central outlet hole. 0.5 - The median diameter of the spray droplets from the nozzle.

8. The gas-assisted atomizing nozzle according to claim 1, characterized in that, The inner diameter (227) at the end of the conical section is greater than the outer diameter (122) of the central liquid tube, and the inner diameter (227) at the end of the conical section satisfies the following relationship: In the formula, d1 is the inner diameter of the cylindrical section in millimeters, D1 is the outer diameter of the central liquid pipe in millimeters, and d3 is the inner diameter of the end of the conical section in millimeters; Q is the volumetric flow rate of compressed air at the air inlet in cubic meters per second; L is the design range of the nozzle in meters; V is the axial high-speed airflow velocity at the design range L in meters per second; k is the correction coefficient, k = 12~20; when the range L ≥ 4, the value of k is 16 ≤ k ≤ 20; when the range L < 4, the value of k is 12 ≤ k < 16.

9. A sprayer, characterized in that, It includes the gas-assisted atomizing nozzle as described in any one of claims 1-4 and 6-8.

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