CN217725898U - Gas-assisted atomizing nozzle and atomizer thereof - Google Patents
Gas-assisted atomizing nozzle and atomizer thereof Download PDFInfo
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- CN217725898U CN217725898U CN202221079993.2U CN202221079993U CN217725898U CN 217725898 U CN217725898 U CN 217725898U CN 202221079993 U CN202221079993 U CN 202221079993U CN 217725898 U CN217725898 U CN 217725898U
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Abstract
The utility model discloses a gaseous supplementary atomizing nozzle and atomizer thereof, including back lid, middle sleeve and preceding sleeve, form annular air chamber between middle sleeve and the central liquid pipe, form peripheral sap cavity between preceding sleeve and the awl section, form the inner ring sap cavity between the terminal of awl section and the apron internal surface, compressed air passes through annular air chamber entering nozzle outlet district, and liquid gets into nozzle outlet district through central sap cavity and peripheral sap cavity respectively, and compressed air and liquid produce the mixed atomization in nozzle outlet district to outside space sprays. Through the structural design of the nozzle, liquid forms multi-liquid-hole axial jet flow and annular radial jet flow respectively through two liquid flow passages inside the nozzle, compressed air forms axial high-speed airflow through the nozzle, and the axial high-speed airflow forms multi-liquid-hole coaxial mixing atomization and non-coaxial mixing atomization respectively with the multi-liquid-hole axial jet flow and the annular radial jet flow, so that the aims of large spray flow, small fog drop particle size and low energy consumption are fulfilled.
Description
Technical Field
The utility model relates to a spraying field especially involves a gaseous auxiliary atomizing nozzle and atomizer 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 in the nozzle 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, wherein 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 document No. CN 20191066961 discloses an external mixing type induction electrostatic atomizer, which utilizes compressed air to generate axial central air flow and external annular air flow, liquid forms annular axial liquid flow through an annular axial flow passage, the central air flow, the annular axial liquid flow and the external annular air flow form coaxial pneumatic mixing atomization after expansion, the spray shape is a hollow cone, the flow passage of the nozzle is long and narrow, the resistance of the air flow passage and the liquid flow passage is large, the compressed air pressure is large, the spray flow is small, because the central air flow is mixed with the annular axial liquid flow after expansion, the gas flow rate at the moment is relatively small, the atomization effect is relatively poor, and the particle size of 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.
SUMMERY OF THE UTILITY MODEL
Exist not enoughly among the prior art, the utility model provides a gaseous auxiliary atomizing nozzle, this nozzle is the gaseous auxiliary atomizing nozzle of the outer formula of mixing of two liquid flow ways, through the structural design of nozzle, make liquid form multifluid hole axial efflux and annular radial efflux respectively through two inside liquid flow ways of nozzle, and simultaneously, compressed air forms axial high velocity air through this nozzle, axial high velocity air respectively with multifluid hole axial efflux, annular radial efflux has formed the coaxial mixed atomizing of multifluid hole and the coaxial mixed atomizing of non-.
The utility model discloses a realize above-mentioned technical purpose through following technological 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;
a part of 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 central hole, and the outer side of the nozzle central 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 angle in the conical cylinder section is greater than the cone angle of the front end of the central liquid tube, and the cone angle in the conical cylinder section and the diffusion hole angle satisfy the following relational expression:
θ 1 ≤45°
θ 3 ≥1.5θ 1
in the formula, theta 1 -cone angle in cone section, in degrees; theta.theta. 3 Diffusion 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:
5D 0.5 ≤t＜d 2
wherein t is the width of the annular jet cavity and is measured in millimeters; d is a radical of 2 -central exit hole diameter in mm; d is a radical of 3 Inner diameter of the end of the cone section, d 4 Nozzle centre bore diameter, D 0.5 The 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, the 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 D 0.5 The relation of (A) is as follows:
d 2 ≥10D 0.5
in the formula, d 2 Diameter of central exit opening, D 0.5 The 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 pipe 1 The inner diameter of the cylinder section and the outer diameter of the central liquid pipe satisfy the following relational expression: d is a radical of 1 ≥4D 1 ；
The inner diameter of the tail end of the conical cylinder section is larger than the outer diameter of the central liquid pipe, and the inner diameter of the tail end of the conical cylinder section meets the following relational expression:
in the formula, d 1 Internal diameter of the cylinder segment in mm, D 1 The outside diameter of the central liquid tube in mm, d 3 -the internal diameter of the end of the cone section in millimeters;
q-compressed air volume flow at the air inlet, and 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-correction factor, k =12 to 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 beneficial effects that:
1. the utility model provides a gaseous supplementary atomizing nozzle has characteristics such as compressed air pressure is low, the spray flow is big, the droplet particle diameter is little and fog cone angle is big, has improved liquid atomization efficiency, has reduced the purpose of compressed air energy consumption. Under same spray volume and activity duration condition, the utility model provides a gas-assisted atomizing nozzle and atomizer have higher operating efficiency and lower consumption to reach energy saving and emission reduction's target. Furthermore, the utility model provides a gas-assisted atomizing nozzle still has simple structure, the reliability is high and convenient to use's characteristics, can be applicable to a plurality of fields such as pesticide spraying, disinfection and drying.
2. The utility model discloses well liquid forms many liquid holes axial efflux and annular radial efflux respectively through two inside liquid flow ways of nozzle, and many liquid holes axial efflux has solved the gas-liquid area of contact that traditional single liquid hole axial efflux exists little, the little and the low problem of atomizing performance of spraying flow, and annular radial efflux has then further increaseed the gas-liquid area of contact and the spraying flow of nozzle to atomizing performance has been improved. Compressed air forms axial high-speed air current through this nozzle, and axial high-speed air current has formed coaxial mixed atomization of many liquid holes and non-coaxial mixed atomization with many liquid hole axial efflux, the radial efflux of annular respectively, the utility model provides a this kind of nozzle forms these two kinds of mixed atomization modes simultaneously, very big improvement gas-liquid area of contact, has increased the spraying flow of nozzle, has still improved the atomizing performance of nozzle for this nozzle has characteristics such as the spraying flow is big, the droplet particle diameter is little, the fog cone angle is big and the flow adjustable range is big.
3. The utility model discloses a nozzle has the awl section of thick bamboo section of internal cross-section convergent, and compressed air is the biggest at awl section of thick bamboo terminal surface and near the velocity of flow of nozzle centre bore, and meanwhile, the liquid efflux also produces mixed atomizing with compressed air in this department, make full use of axial high velocity air's atomizing ability, improved compressed air's atomization efficiency, reduced required compressed air pressure of shower nozzle and energy consumption.
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 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-front end of central liquid pipe, 122-outer diameter of central liquid pipe, 123-front end cone angle of central liquid pipe and 151-diameter of central liquid outlet hole; 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-connecting sleeve, 32-cover plate, 33-nozzle central hole, 34-nozzle outlet area, 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 tube outer annular surface, 333-inner extension tube end surface, 334-inner extension tube, 335-nozzle central hole diameter, 336-diffusion hole diffusion angle, 371-radial flow guide cavity, 372-axial flow guide cavity, 373-annular jet cavity and 374-annular jet cavity width.
Detailed Description
Reference will now be made in detail to the embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining 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 "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "axial", "radial", "vertical", "horizontal", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used merely for convenience of description and for simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention. In the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly, e.g., as being 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 meaning of the above terms in the present invention can be understood according to specific situations by those of ordinary skill in the art.
Referring to the drawings, an 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, wherein 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 sequentially enters the nozzle outlet area 34 through the air inlet holes 23 and the annular air cavity 24, and axial high-speed airflow is formed in the nozzle outlet area 34; a portion of the liquid passes through the central liquid inlet aperture 13, the central liquid chamber 14 and the central liquid outlet aperture 15 in sequence into the nozzle outlet region 34, forming a multi-aperture axial jet at the nozzle outlet region 34. Another part of the liquid enters the nozzle outlet area 34 through the peripheral liquid inlet hole 35, the peripheral liquid cavity 36 and the inner annular liquid cavity 37 in sequence, 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:
d 2 ≥10D 0.5
in the formula (d) 2 The diameter of the central liquid outlet hole is in millimeters;
D 0.5 is 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:
40D 0.5 ≤h≤60D 50
wherein h is the axial height of the radial guide plate in mm and D 0.5 Is 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: d is a radical of 1 ≥4D 1 。
The cone section end inner diameter 227 is greater than the central liquid pipe outer diameter 122, and the cone section end inner diameter 227 satisfies the following relation:
in the formula, d 1 Internal diameter of the cylinder section in mm, D 1 The outside diameter of the central liquid tube in mm, d 3 -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 design range of the nozzle, and the unit is meter;
v is the axial high-speed airflow velocity at the design range L, and the unit is meter/second;
k is a correction coefficient, k =12 to 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:
5D 0.5 ≤t＜d 2
wherein, the width of the t-ring-shaped jet cavity is millimeter; d is a radical of 2 -central exit hole diameter in mm; d is a radical of 3 Inner diameter of the end of the cone section, d 4 Nozzle center hole diameter, D 0.5 The 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:
θ 1 ≤45°θ 3 ≥1.5θ 1
in the formula, theta 1 -cone angle in cone segments, in degrees; theta.theta. 3 Diffusion 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 of the present specification, reference to the description of "one embodiment," "some embodiments," "an example," "a specific example," or "some examples" or the like means 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 present 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, it is to be understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that changes, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art without departing from the principles 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, characterized in that 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 connecting sleeve (31) and a cover plate (32), wherein the connecting 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:
θ 1 ≤45°
θ 3 ≥1.5θ 1
in the formula, theta 1 -cone angle in cone segments, in degrees; theta 3 Diffusion 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 inner 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 inner ring surface (223) of the annular groove and the outer ring surface (332) of the inner extension pipe form the axial flow guide cavity (372), and the end surface (333) of the inner extension pipe and the end surface (225) of the annular groove 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. A gas-assisted atomizing nozzle according to claim 6, wherein said annular jet chamber (373) is convergent from the outside inward, the annular jet chamber width (374) is the internal axial width of the annular jet chamber (373), the nozzle central bore diameter (335) is greater than the cone section tip inner diameter (227), and the annular jet chamber width (374) satisfies the following relationship:
5D 0.5 ≤t＜d 2
wherein t is the width of the annular jet cavity and is measured in millimeters; d is a radical of 2 -central exit hole diameter in mm; d 3 Inner diameter of the end of the cone section, d 4 Nozzle centre bore diameter, D 0.5 The median diameter of the spray droplet volume of the nozzle, in mm.
8. A gas-assisted atomizing nozzle according to claim 1, characterized 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 central liquid outlet hole has a diameter (151) and D 0.5 The relation of (A) is as follows:
d 2 ≥10D 0.5
in the formula, d 2 Diameter of central exit opening, D 0.5 The spray droplet volume pitch diameter of the nozzle.
9. A gas-assisted atomizing nozzle according to claim 1, characterized in that the cylinder section inner diameter (211) is greater than the center tube outer diameter (122), and the cylinder section inner diameter (211) and the center tube outer diameter (122) satisfy the following relationship:
d 1 ≥4D 1
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 (d) 1 Internal diameter of the cylinder segment in mm, D 1 Outside diameter of the central tube in mm, d 3 -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-correction factor, k =12 to 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 (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221079993.2U CN217725898U (en) | 2022-05-07 | 2022-05-07 | Gas-assisted atomizing nozzle and atomizer thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2023216291A1 (en) * | 2022-05-07 | 2023-11-16 | 江苏大学 | Gas-assisted atomizing nozzle and sprayer comprising same |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2023216291A1 (en) * | 2022-05-07 | 2023-11-16 | 江苏大学 | Gas-assisted atomizing nozzle and sprayer comprising same |
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