JP5530974B2 - Spray nozzle dedicated to aeration type - Google Patents

Description

  The present invention relates to a nozzle used for spraying a chemical liquid or the like mixed with air, and particularly to a spray nozzle capable of switching the spray amount.

  Conventionally, as this kind of spray nozzle, what was described in the following patent document 1, for example is known. As shown in FIG. 7, the spray nozzle 51 described in this document includes an upstream main body 54 to which a sprinkler or the like is connected, and a downstream main body 53 having a jet plate 58. The downstream main body 53 includes a nozzle holder 55 having a cap 69 that stops the injection plate 58, and an advance / retreat holder 56 that is connected to the terminal side of the nozzle holder 55. A first orifice plate having a first central orifice hole 63 disposed on the flow path axis C and a peripheral orifice hole 64 disposed around the first orifice hole 63 on the distal side of the downstream body 53. 62 is deployed. An air introduction path 70 is formed between the first orifice plate 62 and the injection plate 58 of the downstream main body 53 to communicate the flow path 74 with the outside of the main body and introduce air outside the main body into the flow path. Has been. An operation cylinder 59 is disposed around the outer periphery of the downstream main body 53, and the operation cylinder 59 is attached to a pivot portion 54B of the upstream main body 54 so as to be rotatable in the circumferential direction.

  Then, the female screw portion 59C formed on the inner peripheral surface of the operation cylinder 59 is screwed with the male screw portion 56A formed on the outer peripheral surface of the downstream main body 53 so that the downstream main body 53 is connected to the upstream main body 54. On the other hand, it is made to advance and retreat in the direction of the nozzle axis C. As a result, when the first orifice plate 62 comes into close contact with the distal end surface 54D of the upstream body 54, the flow path 72 of the upstream body 54 and the central orifice hole 53 of the first orifice plate 52 communicate with each other and the upstream The distal end surface 54 </ b> D of the side body 54 closes the peripheral orifice hole 64 of the first orifice plate 62. On the other hand, when the first orifice plate 62 is separated from the distal end surface 54D of the upstream body 54, the flow path 72 of the upstream body 54 and all of the central orifice hole 63 and the peripheral orifice hole 64 of the first orifice plate 62 Communicate.

The spray nozzle 51 has a large spray particle size, so that the amount of scattering (drift amount) accompanying the wind is small and the spray amount of the chemical solution is small, and the spray type with a small spray particle size and the chemical solution spray amount is large. Switching to a non-air-mixing spray mode is possible. The air non-mixing formula with a small spray particle size is used, for example, for an insecticide, and the air mixing formula with a large spray particle size is used, for example, for a herbicide.
First, in the case of the aeration type, when the operation cylinder 59 is turned by hand to be in the state shown in FIG. 7, the peripheral orifice hole 64 is closed and the communication space 78 is opened. As a result, the chemical solution in the flow path 72 of the upstream main body 54 is jetted into the flow path 74 from only the first central orifice hole 63 of the first orifice plate 62. Therefore, the chemical liquid in the flow path 74 is injected through the flow path 76 and the nozzle 57 after the air sucked from the air introduction path 70 is mixed.
On the other hand, when switching from the air mixing type to the air non-mixing type, when the operating cylinder 59 is turned in the reverse direction, the O-ring 81 comes into contact with the inner peripheral step surface 80 of the operating cylinder 59 and the communication space. 78 is blocked, and the introduction of air from the air introduction path 70 to the flow path 74 is stopped. At the same time, the other end surface of the first orifice plate 62 is separated from the distal end surface 54D of the upstream main body 54, and a space is created between them. Therefore, after the chemical solution from the flow path 72 of the upstream main body 54 flows into the above-described space, it is divided into one that passes through the first central orifice hole 63 and one that passes through the peripheral orifice hole 64. And the chemical | medical solution which passed the 1st center orifice hole 63 and the periphery orifice hole 64 flows out into the flow path 70, and is injected through the flow path 76 and the injection nozzle 57, without mixing air as it is.

JP 2005-319365 A

As described above, the conventional spray nozzle 51 opens and closes the peripheral orifice hole 64 of the first orifice plate 62 by the contact / separation of the distal end surface 54D of the upstream main body 54, and thereby the air mixing type and the air non-mixing type. However, as described above, in the case of the non-air mixing type, the spray particle size is small and it is easy to cause a drift phenomenon. Therefore, a nozzle that is not suitable for certain types of drugs, for example, herbicides, is used. there were.
On the other hand, in herbicides that frequently use aeration spray nozzles, the amount to be sprayed per unit area may vary depending on the type. For example, some herbicides require 25 L per are, and other herbicides require 100 L per are. Even in such a case, the spray nozzle 1 has a problem that it is not possible to switch only the spraying amount in the air mixing type. Note that it is not normally performed to use a herbicide having a relatively low dilution ratio with respect to the stock solution and a highly toxic herbicide and an insecticide having a relatively high dilution ratio with a single spray nozzle.

  The present invention has been made in view of the above-described conventional problems, and an object thereof is to provide a spray nozzle capable of switching between a large amount spraying and a small amount spraying while being a dedicated nozzle for aeration. To do.

In order to achieve the above object, a spray nozzle according to the present invention is provided with an injection plate at the tip of a flow passage formed through the nozzle body, and the nozzle body includes an upstream main body and a downstream having an injection plate. A first central orifice hole formed on the side body and divided in the direction of the flow path axis and disposed on the flow path axis; and a peripheral orifice hole disposed around the first central orifice hole. One orifice plate is arranged on the end side of the downstream main body, and the air outside the main body is introduced into the flow path between the first orifice plate and the jet plate of the downstream main body and communicating with the outside of the main body. The operation cylinder disposed around the downstream main body is attached to the upstream main body so as to be rotatable in the circumferential direction, and is formed on the inner peripheral surface of the operation cylinder. The threaded female threaded part is screwed down with the male threaded part formed on the outer peripheral surface of the downstream body When the first orifice plate is brought into close contact with the distal end surface of the upstream main body by moving the main body forward and backward with respect to the upstream main body, the flow path of the upstream main body and the central orifice hole of the first orifice plate Are connected to each other and the front end surface of the upstream main body closes the peripheral orifice hole of the first orifice plate. When the first orifice plate is separated from the front end surface of the upstream main body, the flow path of the upstream main body A spray nozzle in which the central orifice hole and the peripheral orifice hole of the first orifice plate communicate with each other, and a flow passage is provided in the flow passage between the air introduction passage and the first orifice plate in the downstream main body. A second orifice plate having a second central orifice hole disposed on the shaft center is provided, and the first orifice plate is disposed between the outer peripheral surface of the downstream main body and the inner peripheral surface of the operation cylinder. Tip From the time of contact, the by stopping the nozzle axis direction downstream side end portion of the female screw portion of the nozzle axial direction downstream side end portion is screwed operating accommodating cylinder of the male thread portion of the downstream body abuts In any case until one orifice plate is at a maximum distance from the distal end surface of the upstream main body, a communication space is provided in which the air introduction path is always in communication with the outside of the nozzle.

  Moreover, in the said structure, the front end surface of an upstream main body is comprised with the elastic member which has a flow path arrange | positioned on the flow-path axis of a nozzle main body.

  According to the spray nozzle according to the present invention, the communication space communicates with the outside of the nozzle at any time when the first orifice plate is in close contact with the distal end surface of the upstream main body or separated from the nozzle body. Air outside the nozzle can be introduced into the flow path in the downstream main body from the communication space and the air introduction path. In addition, since the second orifice plate is disposed in the downstream main body between the air introduction path and the first orifice plate, the chemical solution passing through the first central orifice hole and the chemical solution passing through the peripheral orifice hole can be used when spraying a large amount. However, after joining again in front of the second orifice plate, it is ejected vigorously from the second central orifice hole. Thereby, after the chemical solution from the second central orifice hole has mixed a sufficient amount of air from the air introduction path, it can be ejected in a large amount from the nozzle. In other words, this spray nozzle performs a large amount spraying and a small amount spraying only by switching one nozzle without causing the inconvenience of changing the air mixing type large spray amount nozzle and the air mixing type small spray amount nozzle. be able to

  Further, in the case where the tip surface of the upstream body is made of an elastic member having a flow path disposed on the flow path axis of the nozzle body, the first orifice plate is brought into contact with the upstream second orifice plate. When this is done, the elastic member is elastically deformed and closely contacts the end face of the first orifice plate, so that the peripheral orifice hole can be reliably sealed. Accordingly, liquid leakage from the peripheral orifice hole can be prevented, and the liquid flow state from the first orifice plate to the second orifice plate can be kept constant.

It is a front view of a spray nozzle and a dispersion basket concerning Embodiment 1 of the present invention. It is a disassembled perspective view of the said spray nozzle. It is a sectional side view which shows the state which the end surface of the 1st orifice plate and the front end surface of the upstream main body contact | adhered in the said spray nozzle. It is a sectional side view which shows the state which the end surface of the 1st orifice plate and the front end surface of the upstream main body are spaced apart in the said spray nozzle. It is a sectional side view which shows the state which the end surface of a 1st orifice plate and the front end surface of the elastic member of an upstream main body are closely_contact | adhering in the spray nozzle which concerns on Embodiment 2 of this invention. It is a sectional side view which shows the state which the end surface of the 1st orifice plate and the front end surface of the elastic member of an upstream main body are spaced apart in the spray nozzle of the said Embodiment 2. It is a side view including the partial cross section which shows the conventional spray nozzle.

Embodiments of the present invention will be described with reference to the drawings. The embodiment described below is merely an example embodying the present invention, and does not limit the technical scope of the present invention.
“Embodiment 1”:
FIG. 1 is a front view of a spray nozzle and a sprinkle according to Embodiment 1 of the present invention, FIG. 2 is an exploded perspective view of the spray nozzle, and FIG. 3 is a view of the end face of the first orifice plate and the upstream main body in the spray nozzle. It is a sectional side view which shows the state which the front end surface is closely_contact | adhering.
In each figure, the spray nozzle 1 according to this embodiment includes an upstream main body 4, an O-ring 21, a first orifice plate 12, a second orifice plate 10, an advance / retreat holder 6, an operation cylinder 9, which will be described later. The coupling cap 15, the nozzle holder 5, the core 16, the O-ring 18, the injection plate 8, and the tip cap 19 are configured. In the spray nozzle 1, the distal end side of the angled coupling tool 40 is screwed to the female screw portion 15 </ b> A of the coupling port 27 of the coupling cap 15. And the terminal side of the angled coupling tool 40 is connected with the spreading spear 42 via the joint part 41, and is used for spraying chemical liquids, such as a herbicide. In this embodiment, the tip side is synonymous with the downstream side in the liquid circulation direction, and the terminal side is synonymous with the upstream side in the liquid circulation direction (hereinafter the same).

  The nozzle body 2 described above has flow paths 22, 23, 24, 25, 26, and 17 that are formed so as to penetrate the front end side and the end side in series, and the upstream main body 4 and the jet plate 8. And the downstream main body 3 that is divided into the flow path axis C direction. That is, the nozzle plate 8 having the nozzle hole 7 is provided at the tip of the flow path 22, 23, 24, 25, 26, 17. The downstream main body 3 is engaged with an advance / retreat holder 6 that is movably connected to the upstream main body 4 in the direction of the flow axis C, and an engagement protrusion 5B is engaged with an engagement hole 6C at the tip of the advance / retreat holder 6. The nozzle holder 5 is comprised. A mixing channel 25 is formed through the nozzle holder 5, and a diffuser channel 26 is formed in front of the mixing channel 25. In front of the diffuser flow path 26, a core 16 is mounted that guides the nozzle 7 after colliding a chemical solution. The core 16 is formed with a flow path 17 through which the chemical solution after the collision flows. An O-ring 18 is placed on the tip surface of the nozzle holder 5 around the core 16, and the spray plate 8 is placed on the tip side of the O-ring 18, and a tip cap 19 is put on these. The distal end cap 19 has its female threaded portion 19A screwed with the male threaded portion 5A of the nozzle holder 5, and the spray plate 8, the O-ring 18 and the core 16 are fixed together.

  A recessed portion 6 </ b> D that is depressed toward the distal end side of the advance / retreat holder 6 is formed on the end side of the flow paths 23, 24 of the advance / retreat holder 6. A first orifice plate 12 is disposed in the recess 6D. The first orifice plate 12 has a first central orifice hole 13 disposed on the flow path axis C and, for example, two peripheral orifice holes 14 and 14 disposed around the first central orifice hole 13. ing. The second orifice plate 10 is arranged between the air introduction path 20 and the first orifice plate 12 in the recess 6 </ b> D of the advance / retreat holder 6, that is, at the boundary between the merging channel 23 and the collecting channel 24. The second central orifice hole 11 of the second orifice plate 10 is also disposed on the flow path axis C. The second orifice plate 10 is disposed away from the first orifice plate 12 in the direction of the flow axis C, and the spray liquid that has passed through the first central orifice hole 13 and the peripheral orifice holes 14 and 14 respectively is provided between them. It becomes the flow path 23 for confluence | merging.

  In the recess 6 </ b> D of the advance / retreat holder 6, a small diameter portion 4 </ b> F on the distal end side of the upstream main body 4 is mounted. A circumferential groove 4C is formed on the entire outer circumference of the small diameter portion 4F. The O-ring 21 fitted in the circumferential groove 4C slides in the liquid seal state on the inner circumferential surface of the recess 6D of the advance / retreat holder 6 in the direction of the flow path axis C. An air introduction path 20 is formed on the downstream side of the first orifice plate 12 in the advance / retreat holder 6. The air introduction path 20 is for communicating the collecting flow path 24 and the outside of the main body to introduce air outside the main body into the collecting flow path 24. An operation cylinder 9 is provided around the advance / retreat holder 6, and an outer peripheral flange 9 </ b> B at the end of the operation cylinder 9 is attached to the pivotal support 4 </ b> B of the upstream body 4 so as to be rotatable in the circumferential direction. It has been. A male threaded portion 4A is formed on the outer peripheral surface of the upstream end of the main body 4 and is screwed with the female threaded portion 15A of the cap 15. The outer peripheral flange portion 9B of the operation cylinder 9 is turnably locked by the inner peripheral flange portion of the tip end portion of the cap 15 so as to be prevented from coming off.

  Then, the female screw portion 9C formed on the inner peripheral surface 9A of the operation cylinder 9 is screwed with the male screw portion 6A formed on the outer peripheral surface 6B of the advance / retreat holder 6 so that the advance / retreat holder 6 is connected to the upstream main body 4. On the other hand, it is made to advance and retreat in the direction of the flow path axis C. As a result, when the end face 12A of the first orifice plate 12 is in close contact with the tip face 4D of the upstream body 4, the tip face 4D of the upstream body 4 closes the peripheral orifice holes 14, 14 of the first orifice plate 12. To do. Further, when the first orifice plate 12 is separated from the front end surface 4D of the upstream body 4, the flow path 22 of the upstream body 4 communicates with the peripheral orifice holes 14 and 14. Note that the flow path 22 of the upstream main body 4 and the first central orifice hole 13 of the first orifice plate 12 are always in communication with each other regardless of whether the downstream main body 3 is advanced or retracted relative to the upstream main body 4. On the distal side of the advance / retreat holder 6, for example, two engagement grooves 6E, 6E are formed. These engaging groove portions 6E and 6E engage with rotation preventing projections 4E and 4E formed on the outer peripheral surface of the small diameter portion 4F of the upstream body 4. This prevents the advance / retreat holder 6 from rotating in the circumferential direction with respect to the upstream main body 4. Further, a communication space 28 is formed between the outer peripheral surface 6B of the advance / retreat holder 6 and the inner peripheral surface 9A of the operation cylinder 9. Through this communication space 28, the air introduction path 20 and the outside of the nozzle are always in communication. In other words, the air introduction path is used when the first orifice plate 12 is in close contact with the distal end surface 4D of the upstream body 4 and when the first orifice plate 12 is separated from the distal end surface 4D of the upstream body 4. 20 communicates with the outside of the nozzle.

  Furthermore, the following conditions are set for the jet plate 8, the second orifice plate 10, and the first orifice plate 12. For example, the second central orifice hole 11 and the first central orifice hole 13 are disposed on a common flow path axis C. Further, the hole area (or hole diameter) of the nozzle hole 7 of the injection plate 8 is made larger than the hole area (or hole diameter) of the second central orifice hole 11. The respective orifice holes 11, 13 are set so that the spray amount from all the orifice holes 13, 14, 14 in the first orifice plate 12 is larger than the spray amount from the second central orifice hole 11 in the second orifice plate 10. , 14 and the number of peripheral orifice holes 14 are determined. The spray amount is determined by the hole area of the first central orifice hole 13 of the first orifice plate 12 when spraying a small amount, and is determined by the hole area of the second central orifice hole 11 of the second orifice plate 10 when spraying a large amount. In addition, the hole area of the nozzle hole 7 of the nozzle plate 8 does not affect the spray amount. In order to obtain an aeration type nozzle, the hole area of the nozzle hole 7 must be larger than the hole area of the second central orifice hole 11 of the second orifice plate 10.

  The material of each of the above components is not particularly limited, but the nozzle holder 5, the tip cap 19, the core 16, the coupling cap 15, the operation cylinder 9, the advance / retreat holder 6, and the upstream main body 4 are, for example, It is good to comprise with synthetic resins, such as a polyacetal and a polypropylene. The jet plate 8, the first orifice plate 12, and the second orifice plate 10 may be made of a metal such as stainless steel or brass. The O-rings 18 and 21 may be made of, for example, NBR or fluororubber.

Next, the operation of the spray nozzle 1 configured as described above will be described.
First, the case of small amount spraying (for example, 0.5 L / min) will be described. The advancing and retracting the holder 6 when the operation accommodating cylinder 9 so as to abut on the upstream side main body 4 is rotated, as shown in FIG. 3, the other end surface 12A of the first orifice plate 12 of the upstream-side main body 4 front end surface 4D Abut. At this time, in the first orifice plate 12, the first central orifice hole 13 communicates with the collecting channel 23, while the peripheral orifice holes 14 and 14 are closed. As a result, a small amount of the chemical solution flows out from the flow path 22 of the upstream main body 4 only through the first central orifice hole 13 to the merging flow path 23, and further, the second central orifice hole 11 of the second orifice plate 10. To the collecting flow path 24. The chemical solution in the collecting channel 24 further flows through the mixing channel 25 and the diffuser channel 26, thereby sucking air from the air introduction channel 20. In the collecting channel 24, air from the air introduction path 20 is mixed into the chemical solution from the second central orifice hole 11, collides with the end face of the core 16, and then passes through the channel 17 from the nozzle 7. Be injected.

  On the other hand, when the operation cylinder 9 is rotated so as to separate the advance / retreat holder 6 from the upstream main body 4 for a large amount of spraying (for example, 1.4 L / min), as shown in FIG. The other end surface 12A of the first orifice plate 12 moves away from the distal end surface 30C of the elastic member 30, and a flow path 29 is formed between them. As a result, after a large amount of chemical liquid flows into the flow path 29 from the flow path 22 of the upstream main body 4, it is divided into those passing through the first central orifice hole 13 and those passing through the peripheral orifice holes 14 and 14 on both sides. Then, the chemicals that have passed through the first central orifice hole 13 and the peripheral orifice holes 14 and 14 merge again in the merging channel 23, and then the collecting channel 24 from the second central orifice hole 11 of the second orifice plate 10. After flowing out and mixed with air, it is ejected from the nozzle 7.

  As described above, in the spray nozzle 1, when the first orifice plate 12 is in close contact with the front end surface 4A of the upstream main body 4, or when the first orifice plate 12 is separated from the front end surface 4A of the upstream main body 4. In any case, since the communication space 28 between the advance / retreat holder 6 and the operation cylinder 9 communicates with the outside of the nozzle, air outside the nozzle is always passed from the communication space 28 and the air introduction path 20 into the advance / retreat holder 6. Can be introduced into the collecting channel 24. A second orifice plate 10 is provided in the advance / retreat holder 6 with the air introduction passage 20, and a confluence channel 23 is provided between the first orifice plate 12 and the second orifice plate 10. Therefore, when a large amount is sprayed, the chemical solution passing through the first central orifice hole 13 and the chemical solution passing through the peripheral orifice holes 14 and 14 are merged again in the merging flow path 23, and the second central orifice of the second orifice plate 10. It is ejected vigorously from the hole 11. As a result, a large amount of the chemical solution from the second central orifice hole 11 is ejected from the nozzle 7 after mixing a sufficient amount of air from the air introduction path 20. That is, the spray nozzle 1 can perform chemical spraying only with an aeration type spraying mode in both cases of small amount spraying (for example, 0.5 L / min) and large amount spraying (for example, 1.4 L / min). .

“Embodiment 2”:
Next, the spray nozzle according to Embodiment 2 of the present invention will be described. As shown in FIGS. 5 and 2, the spray nozzle 1 </ b> A of the second embodiment has many configurations in common with the spray nozzle 1 of the first embodiment described above, but the difference in configuration is that the flow path of the upstream main body 4. An engagement hole 4G is formed at the distal end of 22 and an elastic member 30 made of, for example, a rubber material is mounted in the engagement hole 4G. The elastic member 30 includes a disk part 30D and a locking protrusion 30B formed to protrude from the disk part 30D to the other end side. And the flow path 30A arrange | positioned on the flow-path axis C is penetrated and formed in the latching protrusion 30B from the disk center of the disk part 30D. The elastic member 30 is made of, for example, a rubber material such as NBR or fluorine rubber, or a thermoplastic elastomer. The elastic member 30 is fixed by the latching protrusion 30 </ b> B being inserted into the engagement hole 4 </ b> G of the upstream body 4 and hooked. That is, the distal end portion of the upstream main body 4 is configured by the elastic member 30.

  Therefore, when the operation cylinder 9 is turned to bring the end face 12A of the first orifice plate 12 into contact with the end face 30C of the elastic member 30, the elastic member 30 is elastically deformed and the end face of the first orifice plate 12 is reached. It closely adheres to 12A (see FIG. 5). Thereby, the peripheral orifice holes 14 and 14 can be reliably sealed. As a result, liquid leakage from the peripheral orifice holes 14 and 14 can be prevented, and the chemical liquid can flow exclusively from the first central orifice hole 13 to the second central orifice hole 11 of the second orifice plate 10. Further, since the elastic member 30 is not in contact with the rigid bodies but is in soft contact with each other, no contact noise is generated and the sound is quiet.

  On the other hand, when the operating cylinder 9 is rotated so as to separate the advance / retreat holder 6 from the upstream main body 4, the advance / retreat holder 6 moves as shown by an arrow U as shown in FIG. The other end surface 12A is separated from the distal end surface 30C of the elastic member 30, and a flow path 29 is formed between them. As a result, the chemical solution from the flow path 30A of the elastic member 30 is divided into a flow path 29 that passes through the first central orifice hole 13 and a flow path that passes through the peripheral orifice holes 14 and 14 on both sides. Then, the chemicals that have passed through the first central orifice hole 13 and the peripheral orifice holes 14 and 14 merge again in the merging channel 23, and then the collecting channel 24 from the second central orifice hole 11 of the second orifice plate 10. After flowing out and mixed with air, it is injected from the nozzle 7.

  Therefore, according to this spray nozzle 1A, in both cases of small amount spraying and large amount spraying, it is needless to say that the chemical liquid spraying can be performed only by the air mixing type. The peripheral orifice holes 14 and 14 can be reliably sealed by contacting and closely contacting the end face 12A. As a result, a small amount of spraying can be maintained at a specified amount, and the spray state is also stabilized.

In the above embodiment, the peripheral orifice holes 14 and 14 of the first orifice plate 12 are linearly arranged at both side positions of the first central orifice hole 13, but the spray nozzle of the present invention is limited thereto. Instead, the opening position of the peripheral orifice hole 14 may be anywhere as long as it can be closed by the distal end surface 4D of the upstream body 4 or the elastic member 30. Further, the number of peripheral orifice holes 14 provided in the first orifice plate 12 is not limited to two.
Further, by changing the respective hole areas of the first central orifice hole 13, the second central orifice hole 11, and the injection hole 7, it is possible to provide an aeration type spray nozzle with various spray amounts.

1, 1A Spray nozzle 2 Nozzle body 3 Downstream side body 4 Upstream side body 4B Pivot 4D Tip surface 5 Nozzle holder 6 Advance / retreat holder 6A Male thread
6At Nozzle axial direction downstream side end portion 6B Outer peripheral surface 7 Injection hole 8 Spray plate 9 Operation cylinder 9A Inner peripheral surface 9C Female thread portion
9Ct Nozzle axial direction downstream end 10 Second orifice plate 11 Second central orifice hole 12 First orifice plate 12A End face 13 First central orifice hole 14 Peripheral orifice hole 17 Flow path 20 Air introduction path 22 Flow path 23 Merge Flow path 24 Collecting flow path 25 Mixing flow path 26 Diffuser flow path 27 Mounting port 28 Communication space 29 Flow path 30 Elastic member 30A Flow path 30C Tip face 40 Angled coupling tool 41 Joint part 42 Scattering bowl C Flow path shaft Heart U arrow

Claims (2)

A nozzle plate is provided at the tip of the flow path formed through the nozzle body,
The nozzle body is formed by dividing the upstream body and the downstream body having the injection plate in the flow axis direction,
A first orifice plate having a first central orifice hole disposed on the flow axis and a peripheral orifice hole disposed around the first central orifice hole is disposed on a distal side of the downstream body;
An air introduction path is formed between the first orifice plate and the jet plate of the downstream main body to communicate the flow path and the outside of the main body and introduce air outside the main body into the flow path,
The operation cylinder arranged around the downstream main body is attached to the upstream main body so as to be rotatable in the circumferential direction.
The internal thread portion formed on the inner peripheral surface of the operation cylinder is screwed with the external thread portion formed on the outer peripheral surface of the downstream main body to advance and retract the downstream main body in the nozzle axis direction with respect to the upstream main body. Thus, when the first orifice plate is in close contact with the distal end surface of the upstream main body, the flow path of the upstream main body and the central orifice hole of the first orifice plate communicate with each other and the distal end surface of the upstream main body is the first surface. The peripheral orifice hole of the orifice plate is closed, and when the first orifice plate is separated from the front end surface of the upstream body, the flow path of the upstream body, the central orifice hole and the peripheral orifice hole of the first orifice plate, Is a spray nozzle configured to communicate,
A second orifice plate having a second central orifice hole disposed on the flow axis is disposed in the flow path between the air introduction path and the first orifice plate in the downstream main body, and the outer peripheral surface of the downstream main body. When the first orifice plate comes into close contact with the front end surface of the upstream main body between the first cylinder and the inner peripheral surface of the operation cylinder , the downstream end in the nozzle axial direction of the male screw portion of the downstream main body is screwed. At any time until the first orifice plate is maximally separated from the front end surface of the upstream main body by coming into contact with the downstream end portion in the nozzle axial direction of the female threaded portion of the operating cylinder and stopping. A spray nozzle dedicated to an aeration type , characterized in that a communication space is provided in which the introduction path and the outside of the nozzle are always in communication. 2. The spray nozzle for exclusive use in an aeration type according to claim 1, wherein a distal end surface of the upstream main body is formed of an elastic member having a flow path disposed on a flow path axis of the nozzle main body.

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