CN114713390A - Gas-assisted atomizing nozzle and atomizer thereof - Google Patents
Gas-assisted atomizing nozzle and atomizer thereof Download PDFInfo
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- CN114713390A CN114713390A CN202210492184.2A CN202210492184A CN114713390A CN 114713390 A CN114713390 A CN 114713390A CN 202210492184 A CN202210492184 A CN 202210492184A CN 114713390 A CN114713390 A CN 114713390A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
- B05B7/02—Spray pistols; Apparatus for discharge
- B05B7/04—Spray pistols; Apparatus for discharge with arrangements for mixing liquids or other fluent materials before discharge
- B05B7/0416—Spray pistols; Apparatus for discharge with arrangements for mixing liquids or other fluent materials before discharge with arrangements for mixing one gas and one liquid
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B1/00—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means
- B05B1/34—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to influence the nature of flow of the liquid or other fluent material, e.g. to produce swirl
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Abstract
The invention discloses a gas-assisted atomizing nozzle and a sprayer thereof, and the gas-assisted atomizing nozzle comprises a rear cover body, a middle sleeve and a front sleeve, wherein an annular air cavity is formed between the middle sleeve and a central liquid pipe, a peripheral liquid cavity is formed between the front sleeve and a conical barrel section, an inner annular liquid cavity is formed between the tail end of the conical barrel 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 central 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 are sprayed towards an external space. According to the invention, through the structural design of the nozzle, liquid forms multi-liquid-hole axial jet flow and annular radial jet flow through two liquid flow channels in the nozzle respectively, compressed air forms axial high-speed airflow through the nozzle, 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 flow and the annular radial jet flow respectively, so that the aims of large spray flow, small droplet particle size and low energy consumption are achieved.
Description
Technical Field
The invention relates to the field of spraying, in particular to a gas-assisted atomizing nozzle and a sprayer thereof.
Background
The gas-assisted atomizing nozzle and the sprayer are widely applied to the fields of pesticide spraying, disinfection, drying and the like, liquid such as pesticides can form fine fog drops through the gas-assisted atomizing nozzle, and the fog drops are deposited on the surface of an object under the pushing action of high-speed airflow, so that the functions of killing pests, bacteria and the like can be achieved. In addition, the atomization function of the gas-assisted atomization nozzle can also promote the drying of the solution, so that the spray drying function is achieved. The gas-assisted atomizing nozzle is a nozzle component for assisting liquid atomization by utilizing compressed air, liquid and the compressed air collide and break inside and outside the nozzle, and the liquid generates a fine atomizing phenomenon.
At present, gas-assisted atomizing nozzles are divided into an inner mixing type and an outer mixing type, a gas-liquid mixing area of the inner mixing type gas atomizing nozzle is positioned inside the nozzle and generates fog drops in a pressure atomizing mode, and a gas-liquid mixing area of the outer mixing type gas atomizing nozzle is positioned outside the nozzle and mainly atomizes liquid through high-speed flow of compressed air to form gas-liquid two-phase flow consisting of high-speed airflow and fog drops. Patent No. CN201910669205.1 discloses an external mixing type induction electrostatic atomizer, which utilizes compressed air to generate axial central air flow and external annular air flow, liquid passes through an annular axial flow channel to form annular axial liquid flow, the central air flow forms coaxial pneumatic mixing atomization together with the annular axial liquid flow and the external annular air flow after expansion, the atomizing shape is hollow cone type, the flow channel of the atomizer is long and narrow, the resistance of the air flow channel and the liquid flow channel is large, the compressed air pressure is large, the atomizing flow is small, because the central air flow is mixed with the annular axial liquid flow after expansion, the gas flow velocity at this time is relatively small, the atomizing effect is relatively poor, and the particle size of the mist droplets is relatively large.
The existing externally-mixed airflow auxiliary atomizing nozzle mostly adopts a single liquid flow channel type, a liquid flow channel is generally a middle axial flow channel or an annular axial flow channel, liquid forms single-hole axial jet flow 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, the shape of the flow channel is long and narrow, the resistance of compressed air is generally large, the pressure of compressed air is mostly more than 0.1MPa, the spray flow is generally small, the spray flow is mostly below 200 milliliters per minute, and the problems of large energy consumption of the compressed air of the nozzle, poor atomizing performance, small fog cone angle, low operation efficiency and the like are solved, and the spray operation efficiency is reduced.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a gas-assisted atomizing nozzle which is an external mixing type gas-assisted atomizing nozzle with double liquid flow channels, through the structural design of the nozzle, liquid forms multi-liquid-hole axial jet flow and annular radial jet flow through the two liquid flow channels in the nozzle respectively, meanwhile, compressed air forms axial high-speed airflow through the nozzle, 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 flow and the annular radial jet flow respectively.
The present invention achieves the above-described object by the following technical means.
A gas-assisted atomizing nozzle comprises a rear cover body, a middle sleeve and a front sleeve; the front sleeve is provided with a nozzle center hole; the middle sleeve comprises a cylindrical section and a conical section; the rear cover body comprises a nozzle rear cover and a central liquid pipe;
wherein, the conical cylinder section is matched with the front sleeve, and the cylindrical section is matched with the nozzle rear cover; the outlet end of the central liquid pipe is in a tapered shape and is arranged in the conical cylinder section;
the cylinder section is provided with an air inlet, and the gas enters an annular air cavity formed by the central liquid pipe and the cylinder section through the air inlet and then is sprayed out from a central hole of the nozzle;
a liquid inlet hole is formed in the front sleeve, and a part of liquid enters a peripheral liquid cavity and an inner ring liquid cavity formed by the front sleeve and the conical barrel section through the liquid inlet hole and then is sprayed out from a central hole of the nozzle;
part of the liquid enters the central liquid pipe through the nozzle rear cover and then is sprayed out from the central hole of the nozzle through central liquid outlet holes uniformly distributed at the tail end of the central liquid pipe.
In the scheme, the tail end of the conical cylinder section is provided with an annular groove, and the inner ring of the annular groove is an inner ring surface of the annular groove; the inlet end and the outlet end of the annular groove are respectively an annular groove end face and a conical cylinder end face, and a plurality of radial guide plates are uniformly distributed on the conical cylinder end face.
In the scheme, the front sleeve comprises a connecting sleeve and a cover plate, wherein the connecting sleeve is provided with a liquid inlet hole, the cover plate is provided with a nozzle center hole, and the outer side of the nozzle center hole is provided with a diffusion hole; the area between the diffusion holes is the nozzle exit area.
In the above scheme, the outlet end of the central liquid pipe is of 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 cone angle in the conical pipe section, and the diffusion angle of the diffusion hole is the diffusion angle of the diffusion hole; wherein, the cone section internal cone angle is greater than the center liquid pipe front end cone angle, and cone section internal cone angle and diffusion hole spread angle satisfy following relational expression:
θ1≤45°
θ3≥1.5θ1
in the formula, theta1-cone angle in cone segments, in degrees; theta3Diffusion hole diffusion angle, in degrees.
In the scheme, an inner extension pipe is arranged on the inner side of the outlet end of the front sleeve; the outer ring of the inner extension pipe is the outer ring surface of the inner extension pipe, and the end surface of the inner extension pipe, which is far away from the outlet end of the front sleeve, is the end surface of the inner extension pipe.
In the scheme, the outer ring surface of the inner extension pipe is arranged in the outer ring surface of the annular groove; the inner ring liquid cavity comprises a radial flow guide cavity, an axial flow guide cavity and an annular jet cavity, wherein the cover plate and the end surface of the cone form the radial flow guide cavity, the outer annular surface of the annular groove and the outer annular surface of the inner extension pipe form the axial flow guide cavity, and the end surface of the inner extension pipe and the end surface of the annular groove form the annular jet cavity; the radial flow guide cavity, the axial flow guide cavity and the annular jet flow cavity are communicated.
In the above scheme, the annular efflux chamber is the shrink form from outside to inside, and annular efflux chamber width is the inside axial width in annular efflux chamber, and nozzle centre bore diameter is greater than the terminal internal diameter of conical cylinder section, and annular efflux chamber width satisfies following relational expression:
5D0.5≤t＜d2
wherein, the width of the t-annular jet cavity is millimeter; d2-central exit hole diameter in mm; d3Inner diameter of the end of the cone section, d4Nozzle centre bore diameter, D0.5The median diameter of the spray droplet volume of the nozzle, in mm.
In the above scheme, a central liquid cavity is formed inside the central liquid pipe; the tail end of the central liquid pipe is the front end of the central liquid pipe, a central liquid outlet hole is formed in the front end of the central liquid pipe, and the central liquid cavity is communicated with the central liquid outlet hole; wherein, the diameter of the central liquid outlet hole and D0.5The relation of (A) is as follows:
d2≥10D0.5
in the formula (d)2Diameter of the central outlet opening, D0.5The spray droplet volume pitch diameter of the nozzle.
In the above scheme, the inner diameter of the cylinder section is larger than the outer diameter D of the central liquid pipe1The inner diameter of the cylinder section and the outer diameter of the central liquid pipe satisfy the following relational expression: d is a radical of1≥4D1；
The terminal internal diameter of awl section of thick bamboo is greater than central liquid pipe external diameter, and the terminal internal diameter of awl section of thick bamboo satisfies following relational expression:
in the formula (d)1Internal diameter of the cylinder segment in mm, D1The outside diameter of the central liquid tube in mm, d3-the internal diameter of the end of the cone section in millimeters;
q-compressed air volume flow at the air inlet, the unit is cubic meter per second;
l-the design range of the nozzle, in meters;
v-designing the axial high-speed airflow velocity at the range L, wherein the unit is meter/second;
k is a correction coefficient, and k is 12-20;
when the range L is more than or equal to 4, the value range of k is more than or equal to 16 and less than or equal to 20; when the range L is less than 4, the value range of k is more than or equal to 12 and less than 16.
An atomizer comprising a gas-assisted atomizing nozzle.
Has the advantages that:
1. the gas-assisted atomizing nozzle provided by the invention has the characteristics of low compressed air pressure, large atomizing flow, small droplet particle size, large fog cone angle and the like, and aims of improving the liquid atomizing efficiency and reducing the energy consumption of compressed air. Under the conditions of the same spray amount and the same operation time, the gas-assisted atomizing nozzle and the gas-assisted atomizing sprayer provided by the invention have higher operation efficiency and lower power consumption, and achieve the aims of energy conservation and emission reduction. In addition, the gas-assisted atomizing nozzle provided by the invention has the characteristics of simple structure, high reliability and convenience in use, and can be suitable for multiple fields of pesticide spraying, disinfection, drying and the like.
2. According to the invention, liquid forms a multi-liquid-hole axial jet flow and an annular radial jet flow through two liquid flow channels in the nozzle respectively, the multi-liquid-hole axial jet flow solves the problems of small gas-liquid contact area, small spray flow and low atomization performance of the traditional single-liquid-hole axial jet flow, and the annular radial jet flow further increases the gas-liquid contact area and the spray flow of the nozzle and improves the atomization performance. The nozzle provided by the invention forms two mixed atomization modes simultaneously, so that the gas-liquid contact area is greatly improved, the spray flow of the nozzle is increased, the atomization performance of the nozzle is also improved, and the nozzle has the characteristics of large spray flow, small droplet particle size, large spray cone angle, large flow adjustable range and the like.
3. The nozzle designed by the invention is provided with the conical cylinder section with the gradually-reduced inner section, the flow velocity of the compressed air is the maximum near the end surface of the conical cylinder and the central hole of the nozzle, and meanwhile, the liquid jet flow and the compressed air are mixed and atomized at the position, so that the atomization capability of the axial high-speed airflow is fully utilized, the atomization efficiency of the compressed air is improved, and the compressed air pressure and the energy consumption required by the nozzle are reduced.
Drawings
FIG. 1 is a schematic view of a gas-assisted atomizing nozzle according to an embodiment of the present invention;
FIG. 2 is an enlarged view of a portion of FIG. 1;
FIG. 3 is a schematic view of the rear cover structure of FIG. 1;
FIG. 4 is an enlarged view of a portion of FIG. 3;
FIG. 5 is an axial cross-sectional view of the intermediate sleeve referred to in FIG. 1;
FIG. 6 is an enlarged view of a portion of FIG. 5;
FIG. 7 is an axial cross-sectional view of the front sleeve referred to in FIG. 1;
fig. 8 is a partially enlarged view of fig. 7.
Reference numerals:
1-rear cover body, 11-nozzle rear cover, 12-central liquid pipe, 13-central liquid inlet hole, 14-central liquid cavity, 15-central liquid outlet hole, 121-central liquid pipe front end, 122-central liquid pipe outer diameter, 123-central liquid pipe front end cone angle and 151-central liquid outlet hole diameter; 2-middle sleeve, 21-cylinder section, 22-cone section, 23-air inlet, 24-annular air cavity, 211-cylinder section inner diameter, 221-cone end face, 222-radial guide plate, 223-annular groove inner annular face, 224-annular groove, 225-annular groove end face, 226-cone section inner cone angle, 227-cone section end inner diameter, 228-radial guide plate axial height; 3-front sleeve, 31-coupling sleeve, 32-cover plate, 33-nozzle central hole, 34-nozzle outlet region, 35-peripheral liquid inlet hole, 36-peripheral liquid cavity, 37-inner ring liquid cavity, 321-cover plate inner surface, 331-diffusion hole, 332-inner extension pipe outer ring surface, 333-inner extension pipe end surface, 334-inner extension pipe, 335-nozzle central hole diameter, 336-diffusion hole diffusion angle, 371-radial diversion cavity, 372-axial diversion cavity, 373-annular jet cavity and 374-annular jet cavity width.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative and intended to explain the present invention and should not be construed as limiting the present invention.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "axial," "radial," "vertical," "horizontal," "inner," "outer," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present invention and for simplicity in description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting. In the present invention, unless otherwise explicitly stated or limited, the terms "mounted," "connected," "fixed," and the like are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
Referring to the 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 pipe 12, the intermediate sleeve 2 includes a cylindrical section 21 and a conical section 22, and the front sleeve 3 includes a coupling sleeve 31 and a cover plate 32. The nozzle rear cover 11 is internally provided with a central liquid inlet hole 13, the central liquid pipe 12 is internally provided with a central liquid cavity 14, the central liquid cavity 14 is communicated with an external liquid inlet pipe through the central liquid inlet hole 13, the central liquid pipe 12 is of a tubular structure, the central axis of the central liquid cavity 14 is superposed with the central axis of the central liquid pipe 12, the front end 121 of the central liquid pipe is of a conical closed structure, and the front end 121 of the central liquid pipe is provided with a plurality of central liquid outlet holes 15.
The cylinder section 21 of the middle sleeve 2 is a thin-wall circular tube structure, the tube wall of the cylinder section 21 is provided with an air inlet 23, the tail end of the middle sleeve 2 is a cone section 22, the cone section 22 is a conical tube structure with a gradually reduced inner section, and the tail end of the cone section 22 is provided with a cone end surface 221. The connecting sleeve 31 of the front sleeve 3 is a circular tube structure, the tube wall of the connecting sleeve 31 is provided with a peripheral liquid inlet hole 35, the cover plate 32 is positioned at the tail end of the front sleeve 3, the cover plate 32 is a circular plate structure perpendicular to the central axis of the connecting sleeve 31, the center of the cover plate 32 is provided with a nozzle central hole 33, the central axis of the nozzle central hole 33 is coincided with the central axis of the conical tube section 22, and the inner space of the nozzle central hole 33 is a nozzle outlet area 34.
The central liquid tube 12 extends into the interior of the intermediate sleeve 2, and an annular air chamber 24 is formed between the inner surface of the intermediate sleeve 2 and the outer surface of the central liquid tube 12. The conical cylinder section 22 extends into the front sleeve 3, the end surface 221 of the conical cylinder is close to the central hole 33 of the nozzle, a peripheral liquid cavity 36 is formed between the inner surface of the front sleeve 3 and the outer surface of the conical cylinder section 22, an inner annular liquid cavity 37 is formed between the tail end of the conical cylinder section 22 and the inner surface 321 of the cover plate, and the peripheral liquid cavity 36 surrounds the inner annular liquid cavity 37.
Compressed air enters the nozzle outlet area 34 through the air inlet holes 23 and the annular air chamber 24 in sequence, and axial high-speed airflow is formed in the nozzle outlet area 34; a portion of the liquid passes through central liquid inlet aperture 13, central liquid chamber 14 and central liquid outlet aperture 15 in sequence into nozzle outlet region 34, forming a multi-orifice axial jet at nozzle outlet region 34. Another part of the liquid sequentially passes through the peripheral liquid inlet hole 35, the peripheral liquid cavity 36 and the inner annular liquid cavity 37 to enter the nozzle outlet area 34, and annular radial jet flow is formed in the nozzle outlet area 34. The axial high-speed airflow and the multi-liquid-hole axial jet flow form multi-liquid-hole coaxial mixed atomization in the nozzle outlet area, and the axial high-speed airflow and the annular radial jet flow form non-coaxial mixed atomization in the nozzle outlet area and jet towards the outer space.
With reference to fig. 1 to 4, according to the present embodiment, a central axis of the central liquid pipe 12 coincides with a central axis of the conical cylinder section 22, the central liquid pipe front end 121 is close to the nozzle central hole 33, the central liquid chamber 14 is cylindrical, the central liquid pipe front end 121 has a plurality of central liquid outlet holes 15 uniformly distributed in the circumferential direction, the central liquid chamber 14 is communicated with the nozzle outlet area 34 through the central liquid outlet holes 15, the central axis of the central liquid outlet holes 15 is parallel to the central axis of the central liquid chamber 14, and the central liquid outlet hole diameter 151 satisfies the following relation:
d2≥10D0.5
in the formula (d)2The diameter of the central liquid outlet hole is in millimeters;
D0.5is the volume median diameter of the spray droplets of the nozzle, and the unit is millimeter.
With reference to fig. 1, 2, 5, and 6, according to this embodiment, the cone end surface 221 is perpendicular to the central axis of the cone section 22, the cone end surface 221 has a plurality of radial deflectors 222 uniformly distributed in the circumferential direction, a plurality of radial deflector cavities 371 uniformly distributed in the circumferential direction are formed between the radial deflectors 222, the cone end surface 221 is in contact fit with the cover plate inner surface 321, and the radial deflector axial height 228 satisfies the following relation:
40D0.5≤h≤60D50
wherein h is the axial height of the radial guide plate in mm and D0.5Is the volume median diameter of the spray droplets of the nozzle, and the unit is millimeter.
The radial guide plate 222 is located at the outer edge of the end surface 221 of the conical cylinder, the radial guide plate 222 is in a straight blade shape, the inner edge of the end surface 221 of the conical cylinder is provided with an annular groove 224, the annular groove 224 is close to the direction of the central liquid outlet hole 15, the central axis of the annular surface 223 in the annular groove is overlapped with the central axis of the conical cylinder section 22, and the end surface 225 of the annular groove is perpendicular to the central axis of the conical cylinder section 22.
As shown in fig. 1, 2 and 3, according to the present embodiment, the cylinder section inner diameter 211 is larger than the center tube outer diameter 122, and the cylinder section inner diameter 211 and the center tube outer diameter 122 satisfy the following relation: d1≥4D1。
The terminal internal diameter 227 of conical section is greater than central liquid pipe external diameter 122, and the terminal internal diameter 227 of conical section satisfies the following relational expression:
in the formula (d)1Internal diameter of the cylinder segment in mm, D1The outside diameter of the central liquid tube in mm, d3-the internal diameter of the end of the cone section in millimeters;
q is the compressed air volume flow at the air inlet, and the unit is cubic meter per second;
l is the designed range of the nozzle, and the unit is meter;
v is the axial high-speed airflow velocity at the designed range L, and the unit is meter/second;
k is a correction coefficient, and k is 12-20;
when the range L is more than or equal to 4, the value range of k is more than or equal to 16 and less than or equal to 20; when the range L is less than 4, the value range of k is more than or equal to 12 and less than 16.
Referring to fig. 7 and 8, according to the present embodiment, the nozzle central hole 33 includes an inner tube 334 and a diffusion hole 331, the inner tube 334 is a tubular structure with an inner edge of the nozzle central hole 33 extending toward the central liquid tube 12, the inner tube 334 is located inside the annular groove 224, an axial flow guiding cavity 372 is formed between an outer annular surface 332 of the inner tube and an inner annular surface 223 of the annular groove, an annular jet cavity 373 is formed between an end surface 333 of the inner tube and an end surface 225 of the annular groove, and the annular jet cavity 373 surrounds the nozzle outlet region 34. The inner annular liquid cavity 37 comprises a radial flow guide cavity 371, an axial flow guide cavity 372 and an annular jet cavity 373, and the peripheral liquid cavity 36 is communicated with the nozzle outlet area 34 through the inner annular liquid cavity 37
Referring to fig. 1-8, according to the present embodiment, the annular jet cavity 373 is tapered from outside to inside, the annular jet cavity width 374 is the inner axial width of the annular jet cavity 373, the nozzle central hole diameter 335 is larger than the cone section end inner diameter 227, and the annular jet cavity width 374 satisfies the following relationship:
5D0.5≤t＜d2
wherein, the width of the t-ring-shaped jet cavity is millimeter; d2-central exit hole diameter in mm; d is a radical of3Inner diameter of the end of the cone section, d4Nozzle centre bore diameter, D0.5The median diameter of the spray droplet volume of the nozzle, in mm.
The cone section inner cone angle 226 is larger than the center liquid pipe front end cone angle 123, and the cone section inner cone angle 226 and the diffusion hole diffusion angle 336 satisfy the following relation:
θ1≤45°
θ3≥1.5θ1
in the formula, theta1-cone angle in cone segments, in degrees; theta3Diffusion hole diffusion angle, in degrees.
The nozzle rear cover 11 of the rear cover body 1 is connected with the cylinder section 21 of the middle sleeve 2 through a sealing thread, the cylinder section 21 of the middle sleeve 2 is connected with the connecting sleeve 31 of the front sleeve 3 through a sealing thread, the central liquid inlet hole 13 and the peripheral liquid inlet hole 35 are connected with an external liquid inlet pipe through a sealing thread, and the air inlet hole 23 and an external compressed air pipe are connected through a sealing thread.
Example 2
A nebulizer comprising a gas-assisted nebulization nozzle according to example 1 and thus having the advantages of example 1, will not be described in detail herein.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
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, and that variations, modifications, substitutions and alterations can be made in the above embodiments by those of ordinary skill in the art without departing from the principle and spirit of the present invention.
Claims (10)
1. A gas-assisted atomizing nozzle is characterized by comprising a rear cover body (1), a middle sleeve (2) and a front sleeve (3); a nozzle center hole (33) is formed in the front sleeve (3); the middle sleeve (2) comprises a cylindrical section (21) and a conical section (22); the rear cover body (1) comprises a nozzle rear cover (11) and a central liquid pipe (12);
wherein, the conical cylinder section (22) is matched with the front sleeve (3), and the cylindrical section (21) is matched with the nozzle rear cover (11); the outlet end of the central liquid pipe (12) is in a tapered shape, and the outlet end of the central liquid pipe (12) is arranged in the conical barrel section (22);
an air inlet (23) is formed in the cylinder section (21), and air enters an annular air cavity (24) formed by the central liquid pipe (12) and the cylinder section (21) through the air inlet (23) and then is sprayed out from a nozzle central hole (33);
a liquid inlet hole (35) is formed in the front sleeve (3), and a part of liquid enters a peripheral liquid cavity (36) and an inner ring liquid cavity (37) which are formed by the front sleeve (3) and the conical barrel section (22) through the liquid inlet hole (35) and then is sprayed out from the nozzle central hole (33);
a part of liquid enters the central liquid pipe (12) through the nozzle rear cover (11) and then is sprayed out from the nozzle central hole (33) through the central liquid outlet holes (15) uniformly distributed at the tail end of the central liquid pipe (12).
2. The gas-assisted atomizing nozzle according to claim 1, wherein an annular groove (224) is formed at the end of the conical barrel section (22), and an inner ring of the annular groove (224) is an annular groove inner ring surface (223); the inlet end and the outlet end of the annular groove (224) are respectively an annular groove end face (225) and a conical cylinder end face (221), and a plurality of radial guide plates (222) are uniformly distributed on the conical cylinder end face (221).
3. The gas-assisted atomizing nozzle according to claim 1, wherein the front sleeve (3) comprises a coupling sleeve (31) and a cover plate (32), wherein the coupling sleeve (31) is provided with a liquid inlet hole (35), the cover plate (32) is provided with a nozzle center hole (33), and the outer side of the nozzle center hole (33) is provided with a diffusion hole (331); the area between the diffusion holes (331) is the nozzle outlet region (34).
4. The gas-assisted atomizing nozzle of claim 1, characterized in that said central liquid tube (12) outlet end is of a conical configuration having a cone angle (123) at the forward end of the central liquid tube, a cone section having a cone angle (226) within the cone section, and a diffuser aperture (331) having a diffuser aperture diffuser angle (336); wherein, the cone section internal cone angle (226) is greater than the center liquid pipe front end cone angle (123), and the cone section internal cone angle (226) and the diffusion hole diffusion angle (336) satisfy the following relational expression:
θ1≤45°
θ3≥1.5θ1
in the formula, theta1-cone angle in cone segments, in degrees; theta.theta.3Diffusion hole diffusion angle, in degrees.
5. A gas-assisted atomizing nozzle according to any one of claims 1 to 4, characterized in that the front sleeve (3) is provided with an inner extension tube (334) inside the outlet end; the outer ring of the inner extension pipe (334) is an outer ring surface (332) of the inner extension pipe, and the end surface, away from the outlet end of the front sleeve, of the inner extension pipe (334) is an end surface (333) of the inner extension pipe.
6. The gas-assisted atomizing nozzle of claim 5, wherein said inner extension tube outer annular surface (332) is disposed within an annular groove outer annular surface (223); the inner ring liquid cavity (37) comprises a radial flow guide cavity (371), an axial flow guide cavity (372) and an annular jet cavity (373), wherein the cover plate (32) and the conical cylinder end surface (221) form the radial flow guide cavity (371), the annular groove outer ring surface (223) and the inner extension pipe outer ring surface (332) form the axial flow guide cavity (372), and the inner extension pipe end surface (333) and the annular groove end surface (225) form the annular jet cavity (373); the radial flow guide cavity (371), the axial flow guide cavity (372) and the annular jet cavity (373) are communicated.
7. The gas-assisted atomizing nozzle according to claim 6, characterized in that said annular jet cavity (373) is constricted from outside to inside, the annular jet cavity width (374) is the inner axial width of the annular jet cavity (373), the nozzle central bore diameter (335) is greater than the cone section tip inner diameter (227), and the annular jet cavity width (374) satisfies the following relationship:
5D0.5≤t＜d2
wherein, the width of the t-annular jet cavity is millimeter; d2-central exit hole diameter in mm; d3Inner diameter of the end of the cone section, d4Nozzle centre bore diameter, D0.5The median diameter of the spray droplet volume of the nozzle, in mm.
8. A gas-assisted atomisation nozzle according to claim 1, characterised in that the central liquid tube (12) is internally provided with a central liquid chamber (14); the tail end of the central liquid pipe (12) is a central liquid pipe front end (121), a central liquid outlet hole (15) is formed in the central liquid pipe front end (121), and the central liquid cavity (14) is communicated with the central liquid outlet hole (15); wherein, the diameter (151) of the central liquid outlet hole and D0.5The relation of (A) is as follows:
d2≥10D0.5
in the formula (d)2Diameter of the central outlet opening, D0.5The spray droplet volume pitch diameter of the nozzle.
9. A gas-assisted atomizing nozzle according to claim 1, wherein the cylinder segment inner diameter (211) is greater than the center liquid tube outer diameter (122), the cylinder segment inner diameter (211) and the center liquid tube outer diameter (122) satisfying the following relationship:
d1≥4D1
the inner diameter (227) of the end of the conical barrel section is larger than the outer diameter (122) of the central liquid pipe, and the inner diameter (227) of the end of the conical barrel section meets the following relational expression:
in the formula, d1Internal diameter of the cylinder section in mm, D1The outside diameter of the central liquid tube in mm, d3-the inner diameter of the end of the conical section,the units are millimeters;
q-compressed air volume flow at the air inlet, the unit is cubic meter per second;
the design range of the L-shaped nozzle is meter;
v-designing the axial high-speed airflow velocity at the range L, wherein the unit is meter/second;
k-correction coefficient, k being 12-20;
when the range L is more than or equal to 4, the value range of k is more than or equal to 16 and less than or equal to 20; when the range L is less than 4, the value range of k is more than or equal to 12 and less than 16.
10. A nebulizer comprising a gas-assisted nebulization nozzle according to any one of claims 1 to 4, 6 to 9.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210492184.2A CN114713390A (en) | 2022-05-07 | 2022-05-07 | Gas-assisted atomizing nozzle and atomizer thereof |
| PCT/CN2022/093743 WO2023216291A1 (en) | 2022-05-07 | 2022-05-19 | Gas-assisted atomizing nozzle and sprayer comprising same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210492184.2A CN114713390A (en) | 2022-05-07 | 2022-05-07 | Gas-assisted atomizing nozzle and atomizer thereof |
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| Publication Number | Publication Date |
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| CN114713390A true CN114713390A (en) | 2022-07-08 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202210492184.2A Pending CN114713390A (en) | 2022-05-07 | 2022-05-07 | Gas-assisted atomizing nozzle and atomizer thereof |
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| Country | Link |
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| CN (1) | CN114713390A (en) |
| WO (1) | WO2023216291A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115228642A (en) * | 2022-08-02 | 2022-10-25 | 北京航空航天大学 | Small-flow dispersion flow atomizing nozzle and low-flow-velocity atomizer |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE69304648T2 (en) * | 1992-10-13 | 1997-02-13 | Abb Lummus Global Inc | Feed atomization process in a fluid catalytic cracking process |
| US8960571B2 (en) * | 2012-08-17 | 2015-02-24 | Spraying Systems Co. | Full cone air-assisted spray nozzle assembly |
| CN204127950U (en) * | 2014-07-25 | 2015-01-28 | 烟台双强燃烧工程有限公司 | Triple combination atomized oil gun |
| CN107723814B (en) * | 2017-11-24 | 2023-05-26 | 北京化工大学 | Multistage jet airflow auxiliary refining device for electrostatic spinning |
| BE1025961B1 (en) * | 2018-01-30 | 2019-08-28 | Safran Aero Boosters S.A. | ANNULAR PASSAGE BETWEEN A VIROLE AND A ROTORIC PLATFORM OF TURBOMACHINE |
| CN217725898U (en) * | 2022-05-07 | 2022-11-04 | 江苏大学 | Gas-assisted atomizing nozzle and atomizer thereof |
-
2022
- 2022-05-07 CN CN202210492184.2A patent/CN114713390A/en active Pending
- 2022-05-19 WO PCT/CN2022/093743 patent/WO2023216291A1/en unknown
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115228642A (en) * | 2022-08-02 | 2022-10-25 | 北京航空航天大学 | Small-flow dispersion flow atomizing nozzle and low-flow-velocity atomizer |
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| WO2023216291A1 (en) | 2023-11-16 |
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