CN211937474U - Mist making device, atomizing device and carrier - Google Patents

Abstract

The utility model discloses a system fog device, atomizing device and carrier. The fog making device comprises an air duct, an atomizing main body and a plurality of shunting fan blades. The dryer has and opens the mouth, and open mouth department is located to the atomizing main part, and the atomizing main part has the liquid supply channel, and the atomizing main part is located to the reposition of redundant personnel flabellum, prescribes a limit to air flow channel between arbitrary adjacent two reposition of redundant personnel flabellums, and the fluid atomization of flowing out in the liquid outlet will be followed to the air current that blows off from the air outlet. According to the utility model discloses a fog making device is through setting up the feed liquor passageway in the atomizing main part, utilizing two adjacent reposition of redundant personnel flabellums to prescribe a limit to the air outlet channel, and the liquid outlet of feed liquor passageway's at least part is relative with the air current outlet of air current channel to can utilize the striking between air current and the liquid to make liquid atomization, can utilize the air current velocity of flow, liquid velocity of flow control liquid atomization degree from this, and then can realize that the atomization degree is adjustable controllable.

Description

Mist making device, atomizing device and carrier

Technical Field

The utility model belongs to the technical field of plant protection equipment technique and specifically relates to a system fog device, atomizing device and carrier are related to.

Background

In the related art, a centrifugal spray head and a pressure spray head are generally used as a spraying device of plant protection equipment. Wherein, the centrifugal nozzle can not realize the directional spraying function; the pressure nozzle can realize directional spraying but needs high-pressure equipment, so that the structure of the plant protection equipment is complex and the production cost is high.

SUMMERY OF THE UTILITY MODEL

The application provides a system fog device, system fog device has simple structure, the controllable advantage of system fog effect.

The application provides an atomizing device, atomizing device has as above system fog device.

The application still provides a carrier, the carrier has as above system fog device.

According to the utility model discloses system fog device, include: an air duct having an open opening; the atomization main body is arranged at the opening and provided with a liquid supply channel; the flow distribution fan blades are arranged on the atomization main body, an airflow channel is defined between any two adjacent flow distribution fan blades, and the airflow blown out from the airflow outlet atomizes the fluid flowing out from the liquid outlet.

According to the utility model discloses system fog device is through setting up liquid supply channel in the atomizing main part, utilizing two adjacent reposition of redundant personnel flabellums to prescribe a limit to gas flow channel, and liquid supply channel's liquid outlet's at least part is relative with gas flow channel's air current export to can utilize the striking between air current and the liquid to make liquid atomization, can utilize the air current velocity of flow, liquid velocity of flow control liquid atomization degree from this, and then can realize that the atomization degree is adjustable controllable.

In some embodiments, the atomizing body comprises: the main part, the main part has the holding surface, the reposition of redundant personnel flabellum is located the holding surface for inject the liquid supply channel's liquid supply pipeline, liquid supply pipeline wears to locate the main part.

In some embodiments, a plurality of the splitter blades are spaced apart along a circumferential direction of the support surface.

In some embodiments, the supporting surface is located on an end surface of the main body, the liquid supply pipeline penetrates through the supporting surface, an orthographic projection of the liquid outlet on the supporting surface is located at the center of the supporting surface, and the plurality of splitter blades are arranged around the liquid outlet.

In some embodiments, each of the splitter blades extends in the same direction as the radial direction of the liquid outlet.

In some embodiments, the plurality of splitter blades extend in a direction offset from a radial direction of the liquid outlet.

In some embodiments, each of the splitter blades is offset clockwise or counterclockwise from the radial direction at the corresponding location in a radially inward to radially outward direction of the liquid outlet.

In some embodiments, any two of the splitter blades are offset from the radial direction at the corresponding locations by the same angle.

In some embodiments, two end faces of the main body portion in an axial direction are a first end face and a second end face respectively, the liquid supply line is arranged through the main body portion in the axial direction, and the liquid outlet is located on one side of the main body portion having the first end face; the side wall of the main body part in the circumferential direction is the supporting surface, and the plurality of flow dividing fan blades are arranged on the supporting surface and are spaced apart in the circumferential direction of the main body part.

In some embodiments, the splitter blades extend in a twisted manner in a circumferential direction of the main body in an axial direction of the main body.

In some embodiments, the fan blade has a positioning hole, the air duct has a fixing hole, and the mist generator further includes a fixing member, the fixing member is disposed through the fixing hole and the positioning hole.

In some embodiments, the supply line has a tube wall with an outlet aperture.

In some embodiments, the water outlet hole is a plurality of water outlet holes, and the plurality of water outlet holes are spaced apart along the circumferential direction of the liquid supply pipeline.

In some embodiments, the shunting fan blade has a bridging portion protruding from the atomizing main body, and the bridging portion abuts against the edge of the open opening.

In some embodiments, the mist generator further comprises a screw cap disposed at the opening, the screw cap being screw-fitted to a peripheral wall of the air duct, the overlapping portion being interposed between the screw cap and an edge of the opening, the screw cap having a through hole.

In some embodiments, the atomizing body has a reservoir surrounding the liquid outlet.

In some embodiments, the reservoir is annular and the liquid outlet is located in the middle of the annular reservoir.

In some embodiments, the reservoir is a plurality of reservoirs, each reservoir is nested in the liquid outlet, and the plurality of reservoirs are spaced apart along a radial direction of the liquid outlet.

According to the utility model discloses atomizing device, including as above system fog device.

According to the utility model discloses atomizing device is through setting up liquid supply channel in the atomizing main part, utilizing two adjacent reposition of redundant personnel flabellums to prescribe a limit to gas flow channel, and liquid supply channel's liquid outlet's at least part is relative with gas flow channel's air current export to can utilize the striking between air current and the liquid to make liquid atomization, can utilize the air current velocity of flow, liquid velocity of flow control liquid atomization degree from this, and then can realize that atomization degree is adjustable controllable.

According to the utility model discloses carrier of embodiment includes the fog making device as above or the atomizing device as above.

According to the utility model discloses carrier, through set up the feed liquor passageway in the atomizing main part, utilize two adjacent reposition of redundant personnel flabellums to prescribe a limit to the air outlet channel, the liquid outlet of feed liquor passageway's at least part is relative with the air current export of air current channel to can utilize the striking between air current and the liquid to make liquid atomization, can utilize the air current velocity of flow, liquid velocity of flow control liquid atomization degree from this, and then can realize that atomization degree is adjustable controllable.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

fig. 1 is a schematic structural view of a mist generating device according to an embodiment of the present invention;

FIG. 2 is a schematic cross-sectional view taken along A-A of FIG. 1;

FIG. 3 is an enlarged partial schematic view at A in FIG. 2;

fig. 4 is a schematic structural view of an atomizing main body of a mist producing device according to an embodiment of the present invention;

FIG. 5 is a front view of the atomizing body of FIG. 4;

FIG. 6 is a top view of the atomizing body of FIG. 4;

fig. 7 is a schematic structural view of an atomizing main body of a mist producing device according to an embodiment of the present invention;

FIG. 8 is a front view of the atomizing body of FIG. 7;

FIG. 9 is a top view of the atomizing body of FIG. 7;

fig. 10 is a schematic structural view of an atomizing main body of a mist producing device according to an embodiment of the present invention;

FIG. 11 is a front view of the atomizing body of FIG. 10;

figure 12 is a top view of the atomising body in figure 10;

fig. 13 is a schematic structural view of an atomizing main body of a mist producing device according to an embodiment of the present invention;

figure 14 is a front view of the atomising body of figure 13;

FIG. 15 is a top view of the atomizing body of FIG. 13;

fig. 16 is a front view of an atomizing body of a mist producing device according to an embodiment of the present invention;

figure 17 is a top view of the atomising body in figure 16.

Reference numerals:

the mist generating device (100) is provided with a mist generating device,

the air duct 110 is provided with a plurality of air ducts,

the atomizing body 120, the liquid supply channel 121, the liquid outlet 122,

the diverter blades 126, the overlap 1261, the airflow channel 123, the reservoir 127,

the main body 130, the positioning hole 132, the supporting surface 136, the first end surface 137, the second end surface 138,

a liquid supply pipe 150, a water outlet 151,

the fan assembly (170) is provided with a fan,

a screw cap 190 and a through hole 191.

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 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 drawings are exemplary only for the purpose of explaining the present invention, and should not be construed as limiting the present invention.

A mist generating device 100 and a vehicle according to an embodiment of the present invention are described below with reference to fig. 1 to 17. The carrier may be a plant protection device, which is movable in a target area, and the carrier may be mounted with a functional device such as a detection device or a mist generation device. That is, the target area and the target crop can be directionally sprayed by the vehicle and the fog-making device 100 disposed on the vehicle, and the target area can also be directionally mapped by the vehicle and the detecting device disposed on the vehicle.

As shown in fig. 1-2, a mist generating device 100 according to an embodiment of the present invention includes: the air duct 110, the atomizing body 120 and the plurality of splitter blades 126. In the description of the present invention, "a plurality" means two or more, for example, three, five, six, etc. split blades 126.

Specifically, the air duct 110 has an open opening, a fan assembly 170 may be disposed in the air duct 110, and the fan assembly 170 may pump airflow into the air duct 110. The atomizing body 120 is disposed at the opening, and the atomizing body 120 has a liquid supply passage 121. The splitter blades 126 are disposed on the atomizing body 120, an airflow channel 123 is defined between any two adjacent splitter blades 126, at least a portion of the liquid outlet 122 of the liquid supply channel 121 is opposite to the airflow outlet of the airflow channel 123, and the airflow blown out from the airflow outlet is suitable for atomizing the fluid flowing out from the liquid outlet 122. Here, the "splitter blade 126" not only has a function of defining the air flow passage 123, but also has a function of guiding the air flow.

The fluid flowing out of the liquid outlet 122 can be atomized by opposing at least a portion of the liquid outlet 122 of the liquid supply passage 121 to the air flow outlet of the air flow passage 123, whereby the air flow blown out from the air flow outlet and the fluid flowing out from the liquid outlet 122 are cut off from each other.

It should be noted that the air flow pumped into the air duct 110 by the fan assembly 170 can flow to the liquid outlet 122 of the liquid supply channel 121 through the air flow channel 123, and the air flow blown out from the air flow outlet and the liquid flowing out from the liquid outlet 122 will collide, and the liquid is atomized after the collision. In addition, the atomization parameters such as the size of atomized particles, the spraying speed and the like can be controlled by controlling the flow rate of the air flow and the flow rate of the liquid. In order to allow the gas to sufficiently atomize the liquid, the gas flow outlet is opposite the liquid outlet 122, or a partial structure of the gas flow outlet is opposite the liquid outlet 122. In other words, the gas flowing out of the gas flow outlet has an impact, cutting action on the liquid flowing out of the liquid outlet 122.

In addition, the structure of the wind barrel 110 can be designed according to the venturi effect, the inner wall is smooth to reduce the resistance force applied in the gas flowing process, the wind speed and the wind pressure are increased through reducing, and the back pressure phenomenon is avoided or reduced as much as possible while the wind speed and the wind pressure are improved in the selection of the ratio of variation to diameter. The heat dissipation device is attached to improve the working durability and safety of the fan. The air duct 110 may be provided with a dust-proof structure such as a dust screen or dust cotton at the air inlet end of the fan assembly 170. It is understood that, in order to reduce the internal components of the air duct 110, a dust-proof structure may be provided outside the air duct 110. In fact, since the integrated mist making device 100 includes the air duct 110 for realizing the atomizing function, the air duct 110 may be connected with an external air duct having a conveying function, and thus the dustproof structure may also be provided on the external air duct having the conveying function.

According to the utility model discloses fog making device 100, through set up liquid supply channel 121 on atomizing main part 120, utilize two adjacent reposition of redundant personnel flabellums 126 to inject airflow channel 123, liquid supply channel 121's liquid outlet 122 at least part is relative with airflow channel 123's airflow outlet to can utilize the striking between air current and the liquid to make liquid atomizing, can utilize the air current velocity of flow, liquid velocity of flow control liquid atomization degree from this, and then can realize that atomization degree is adjustable controllable.

As shown in fig. 3, according to some embodiments of the present invention, the shunting fan blade 126 has a lapping portion 1261, the lapping portion 1261 protrudes from the atomizing body 120, and the lapping portion 1261 abuts against the edge of the open opening. It will be appreciated that the overlap 1261 may cooperate with a portion of the structure of the splitter blade 126 to form a stepped structure that may snap over the edge of the open mouth.

As shown in fig. 1 and 2, according to some embodiments of the present invention, the mist generator 100 may further include a screw cap 190, the screw cap 190 is disposed at the opening, the screw cap 190 is screw-fitted to the circumferential wall of the air duct 110, the overlapping portion 1261 is clamped between the screw cap 190 and the edge of the opening, and the screw cap 190 has a through hole 191, so that the atomized fluid may flow out through the through hole 191.

According to some embodiments of the present invention, the atomizing body 120 may include: a main body portion 130 and a liquid supply line 150 for defining a liquid supply passage 121. The main body 130 has a supporting surface 136, the shunting fan blades 126 are disposed on the supporting surface 136, and the liquid supply pipe 150 is disposed through the main body 130. Thereby, the structure of the atomizing body 120 can be simplified.

In some embodiments, as shown in fig. 4-17, the plurality of splitter blades 126 may be spaced apart along the circumferential direction of the support surface 136. It should be noted that the air outlet channel 123 can be defined between any two adjacent splitter blades 126, and the air flow flowing out from each air flow channel 123 has scattering and atomizing effects on the liquid flowing out from the liquid supply channel 121, so that the atomizing effect of the atomizing main body 120 can be improved. As shown in fig. 6, 9, 12, and 15, the direction indicated by the arrow a is the direction of the airflow in the airflow channel 123.

Further, as shown in fig. 4-15, the supporting surface 136 may be located at an end surface of the main body 130, the liquid supply pipeline 150 is disposed through the supporting surface 136, the orthographic projection of the liquid outlet 122 on the supporting surface 136 is located at the center of the supporting surface 136, and the plurality of splitter blades 126 are disposed around the liquid outlet 122. Therefore, the liquid can be atomized from different positions in the circumferential direction, and the atomized liquid drops can be more uniform, so that the atomization effect can be improved.

Further, as shown in fig. 10-12, each splitter blade 126 extends in the same radial direction as the liquid outlet 122. Therefore, the airflow outlet of the airflow channel 123 is opposite to the liquid outlet 122, so that the airflow blows the liquid flowing out of the liquid outlet 122 directly, the impact force of the airflow on the liquid can be improved, and the atomization effect is improved.

It should be noted that the distribution of the splitter blades 126 is not limited to this, for example, in some embodiments, as shown in fig. 4-9 and 13-15, the extending direction of the splitter blades 126 deviates from the radial direction of the liquid outlet 122. From this the air current of following air flow channel 123 outflow can carry out the slant cutting to the liquid that flows out from liquid outlet 122 to can optimize the impact effect of air current to liquid according to fluid characteristic, and then can promote the atomizing effect of atomizing main part 120. Further, as shown in fig. 4-9 and 13-15, in a radial inside to radial outside direction of the liquid outlet 122, each splitter blade 126 is offset from a radial direction at a corresponding position clockwise or counterclockwise, and an angle of any two splitter blades 126 from the radial direction at the corresponding position is the same, so that the atomization uniformity of the atomizing body 120 can be improved.

In order to improve the atomization effect of the atomizing body 120, in some embodiments, as shown in fig. 7-8, the liquid supply pipe 150 has a pipe wall having an outlet hole 151. Wherein the outlet hole 151 is plural, the plural outlet holes 151 are located at the liquid outlet 122, and the plural outlet holes 151 are spaced apart along the circumferential direction of the liquid supply line 150. It will be appreciated that liquid may not only flow out of the liquid outlet 122, but also out of the water outlet hole 151, thereby allowing more liquid to contact the air flow, and thus more air flow to impinge on the liquid to optimize the atomization effect.

According to some embodiments of the present invention, as shown in fig. 10-15, the atomizing body 120 has a reservoir 127, the reservoir 127 surrounding the liquid outlet 122. Further, the sump 127 is annular, and the liquid outlet 122 is located in the middle of the annular sump 127. The reservoir 127 can thus be used to store liquid that is not blown out, preventing the backflow of liquid from affecting the normal operation of the mist generating device 100. Further, the reservoir 127 may be plural, each reservoir 127 housing the liquid outlet 122, the plural reservoirs 127 being spaced apart in a radial direction of the liquid outlet 122. It will be appreciated that a plurality of annular reservoirs 127 may be sequentially nested within the liquid outlet 122 in a direction from radially inward to radially outward of the liquid outlet 122. Whereby the backflow of the liquid can be further prevented.

In addition, it should be noted that the reservoir 127 may be formed by a plurality of ribs, the reservoir 127 is defined between two adjacent ribs, and the height of the rib does not affect the speed, flow rate and other parameters related to the atomization performance of the air flow as much as possible, or the height of the rib needs to reduce the influence on the above parameters. When the atomizing body 120 has a plurality of reservoirs 127, the reservoirs 127 may be of the same or different depths. In addition, the vertical distance between the two ribs of each reservoir 127 is the width of the reservoir 127, and the widths of the reservoirs 127 on the same atomizing body 120 may be the same or different.

According to some embodiments of the present invention, as shown in fig. 16 and 17, two end faces of the main body 130 in the axial direction are the first end face 137 and the second end face 138, respectively, the liquid supply pipeline 150 is disposed through the main body 130 in the axial direction, and the liquid outlet 122 is located on one side of the main body 130 having the first end face 137. The sidewall of the main body 130 in the circumferential direction is a supporting surface 136, and the plurality of splitter blades 126 are disposed on the supporting surface 136 and spaced apart from each other in the circumferential direction of the main body 130. It will be appreciated that the airflow passage 123 defined by two adjacent splitter blades 126 extends generally axially along the main body portion 130. As shown in fig. 16, the direction indicated by the arrow b is the direction of the airflow in the airflow channel 123. As shown in fig. 16, according to some embodiments of the present invention, in the axial direction of the main body 130, the splitter blades 126 extend along the circumferential direction of the main body 130 in a twisted manner.

In order to facilitate the installation of the atomizing body 120 to the air duct 110, in some embodiments, as shown in fig. 16, the splitter blade 126 has a positioning hole 132, the air duct 110 has a fixing hole, and the mist generating device 100 further includes a fixing member, and the fixing member is disposed through the fixing hole and the positioning hole 132.

The atomization device according to the embodiment of the present invention includes the mist generation device 100 as described above.

According to the utility model discloses atomizing device, through set up liquid supply channel 121 on atomizing main part 120, utilize two adjacent reposition of redundant personnel flabellums 126 to inject airflow channel 123, liquid supply channel 121's liquid outlet 122 at least part is relative with airflow channel 123's airflow outlet to can utilize the striking between air current and the liquid to make liquid atomizing, can utilize the air current velocity of flow, liquid velocity of flow control liquid atomization degree from this, and then can realize that atomization degree is adjustable controllable.

The vehicle according to the embodiment of the present invention includes the mist generating device 100 or the atomizing device as described above. The vehicle may be a vehicle, an aircraft, a ship, or the like, and may be a manned machine as well as an unmanned machine.

According to the utility model discloses carrier, through set up liquid supply channel 121 on atomizing main part 120, utilize two adjacent reposition of redundant personnel flabellums 126 to inject airflow channel 123, liquid supply channel 121's liquid outlet 122 at least part is relative with airflow channel 123's airflow outlet to can utilize the striking between air current and the liquid to make liquid atomizing, can utilize the air current velocity of flow, liquid velocity of flow control liquid atomization degree from this, and then can realize that atomization degree is adjustable controllable.

In the description of the present invention, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like, indicate orientations and positional relationships based on the orientations and positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element so 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 description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like 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 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.

While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims (20)

1. A mist producing apparatus, comprising:

an air duct having an open opening;

the atomization main body is arranged at the opening and provided with a liquid supply channel;

the fluid atomization device comprises a liquid supply channel, a plurality of flow distribution fan blades and an atomization main body, wherein the flow distribution fan blades are arranged on the atomization main body, an airflow channel is defined between any two adjacent flow distribution fan blades, and fluid flowing out of a liquid outlet of the liquid supply channel is atomized by airflow blown out from an airflow outlet of the airflow channel.

2. The mist generator as claimed in claim 1, wherein the atomizing body comprises:

the main body part is provided with a supporting surface, and the shunting fan blades are arranged on the supporting surface;

a liquid supply line for defining the liquid supply channel, the liquid supply line passing through the main body portion.

3. The mist generator of claim 2, wherein a plurality of said splitter blades are spaced apart in a circumferential direction of said support surface.

4. The mist generator as claimed in claim 2, wherein the support surface is provided on an end surface of the main body, the liquid supply line is provided through the support surface,

the orthographic projection of the liquid outlet on the supporting surface is located at the center of the supporting surface, and the plurality of shunting fan blades are arranged around the liquid outlet.

5. The mist generator of claim 4, wherein each of said splitter vanes extends in the same direction as the radial direction of said liquid outlet.

6. The mist generator of claim 4, wherein a plurality of said splitter vanes extend in a direction offset from a radial direction of said liquid outlet.

7. The mist generator of claim 6, wherein each of the splitter blades is offset clockwise or counterclockwise from the radial direction at the corresponding location in a radially inward to radially outward direction of the liquid outlet.

8. The mist generator of claim 7, wherein any two of said splitter blades are angled at the same angle from a radial direction at the corresponding location.

9. The mist generating apparatus according to claim 2, wherein two end surfaces of the main body portion in an axial direction are a first end surface and a second end surface, respectively, the liquid supply line is inserted through the main body portion in the axial direction, and the liquid outlet is located on a side of the main body portion having the first end surface;

the side wall of the main body part in the circumferential direction is the supporting surface,

the plurality of the shunting fan blades are arranged on the supporting surface and are spaced along the circumferential direction of the main body part.

10. The mist generator as claimed in claim 9, wherein the splitter blades extend twisted in a circumferential direction of the main body in an axial direction of the main body.

11. The mist generator as claimed in claim 9, wherein the fan blades have positioning holes, the air duct has fixing holes,

the fog making device further comprises a fixing piece, and the fixing piece penetrates through the fixing hole and the positioning hole.

12. The mist generator of claim 2, wherein the supply conduit has a wall with an outlet aperture.

13. The mist producing apparatus according to claim 12, wherein the water outlet hole is plural, and plural water outlet holes are spaced in a circumferential direction of the liquid supply pipe.

14. The mist generator as claimed in claim 1, wherein the fan blades have overlapping portions protruding from the atomizing body, the overlapping portions abutting against edges of the open opening.

15. The mist producing apparatus according to claim 14, further comprising a screw cap provided at the opening, the screw cap being screw-engaged with a peripheral wall of the air duct,

the overlapping portion is sandwiched between the screw cap and the edge of the open mouth,

the screw cap has a through hole.

16. The mist generator of any one of claims 1-15, wherein the atomizing body has a reservoir that surrounds the liquid outlet.

17. The mist generator of claim 16, wherein said reservoir is annular and said liquid outlet is located in the middle of the annular reservoir.

18. The mist generator of claim 17, wherein said reservoir is a plurality of reservoirs, each said reservoir housing said liquid outlet, said plurality of reservoirs being spaced radially of said liquid outlet.

19. An atomising device comprising a mist producing device according to any of the claims 1-18.

20. A vehicle comprising a mist-generating device according to any one of claims 1-18 or a nebulizing device according to claim 19.

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