JP2023178674A - spray nozzle - Google Patents

Abstract

To be able to stably prevent a cap, which is jointed with a screw to a nozzle main body of a spray nozzle to fix a tip member of the nozzle, from loosening with a simple structure.SOLUTION: An engagement part 13, in which mountain-shaped protrusions 13a having inclined surfaces at both sides in a circumferential direction are formed continuously in the circumferential direction, is provided at an inner periphery at a screw-in tip side of a cap 2. Engagement pieces 14, which is constituted of support parts 14a extending out obliquely with respect to a radial direction of a nozzle main body 1 and convex parts 14b leading to tip sides of the support parts 14a and engage with an engagement part 13 of the cap 2, are provided at an outer periphery of the nozzle main body 1. When tightening the cap 2, a protrusion 13a of the engagement part 13 rides over the convex parts 14b of the engagement pieces 14 while displacing the engagement pieces 14 to inside in the radial direction, so that the cap can be tightened smoothly. After the cap 2 is tightened completely, the cap 2 cannot be easily rotated, even when receiving force in a direction in which the cap 2 is loosened by vibration or the like.SELECTED DRAWING: Figure 4

Description

The present invention relates to a spray nozzle used for spraying liquids such as agricultural chemicals and water.

A spray nozzle used for spraying liquids such as pesticides and water has a cylindrical nozzle body with a liquid passage formed through the shaft center and a male thread formed on the outer periphery of the tip, and a liquid passage in the nozzle body. A nozzle tip member such as a spout plate or nozzle tip with a spout opening for spouting the supplied liquid as mist droplets is screwed to the tip of the nozzle body, and the nozzle tip member is attached to the nozzle body with the nozzle exposed. Many of them are equipped with a cap that is fixed to the tip (see, for example, Patent Document 1).

JP 2018-51427 Publication

In the above-mentioned spray nozzle, the tightening of the cap against the nozzle body gradually loosens due to vibrations during use, and this loosening may cause the nozzle tip members such as the spray plate and the nozzle tip to rotate. If the circumferential position of the nozzle tip member changes, the mist particles ejected from the nozzle may be oriented in an unintended direction, and the liquid may not be efficiently sprayed onto the object.

To prevent this, you can periodically retighten the cap, but with large sprayers (for example, boom sprayers with many spray nozzles attached at predetermined intervals along the length of a long boom), etc. , the work of re-tightening the cap becomes complicated.

SUMMARY OF THE INVENTION An object of the present invention is to provide a cap that is screwed to a nozzle body of a spray nozzle to fix a nozzle tip member, and to stably prevent the cap from loosening with a simple structure.

In order to solve the above problems, the present invention provides a cylindrical nozzle body in which a liquid passage is formed through the axial center and a male thread is formed on the outer periphery of the tip, and a liquid that is supplied to the liquid passage in the nozzle body. a nozzle tip member having a nozzle opening for ejecting the water; and a cap screwed to the tip of the nozzle body and fixing the nozzle tip member to the tip of the nozzle body with the nozzle exposed. In the nozzle, the cap is provided with an engaging portion in which a chevron-shaped protrusion having sloped surfaces on both sides in the circumferential direction continues in the circumferential direction on the inner periphery of the screw-in tip side of the female thread that is threadedly connected to the male thread of the nozzle body. The nozzle body has a configuration in which an engaging piece that engages with the engaging portion of the cap is provided on an outer circumference closer to the center in the axial direction than the male thread so that it can be displaced radially inward by elastic deformation. Adopted.

In the above configuration, when the cap is screwed to the tip of the nozzle body when fixing the nozzle tip member to the nozzle body, the engaging part of the cap comes into contact with the engaging piece of the nozzle body. However, if the force used to rotate the cap is increased to a certain extent, the protrusion of the engaging part will elastically deform the engaging piece to displace it radially inward and overcome the engaging piece, making it possible to tighten the cap smoothly. can. When the tightening is completed and the engaging part and the engaging piece are engaged, even if a force is applied in the direction of loosening the cap due to vibration etc., the force will overcome the protrusion of the engaging part and the engaging piece. As long as the cap is not large enough to cause the cap to loosen, the cap can be stably prevented from loosening.

In addition, the mechanism that prevents the cap from loosening in this way is made up of an engaging part consisting of a plurality of chevron-shaped protrusions formed on the inner periphery of the screwed-in tip of the cap, and an engaging part that can be displaced radially inward on the outer periphery of the nozzle body. Since it is composed only of the provided engagement piece, the structure is simple and there is no need to increase the number of parts of the entire spray nozzle.

Here, the engagement piece includes a support portion that extends diagonally from the outer periphery of the nozzle body in the radial direction, and a protrusion that is continuous to the distal end side of the support portion and that is adjacent to the protrusion in the circumferential direction of the cap. It is also possible to adopt a configuration comprising a convex portion that enters the valley between the two. By employing this engagement piece, the design of the cap's resistance to loosening (ease of attachment and detachment) can be easily adjusted.

Further, it is preferable that a plurality of the engagement pieces are provided at equal intervals in the circumferential direction of the nozzle main body, since the force for rotating the cap is applied to the cap in a well-balanced manner.

As described above, in the spray nozzle of the present invention, when the cap is screwed to the nozzle body, the engaging portion consisting of a plurality of chevron-shaped protrusions formed on the inner periphery of the screwed-in tip side of the cap and the nozzle body Since the cap is engaged with an engagement piece provided on the outer periphery so as to be displaceable inward in the radial direction, the cap can be stably prevented from loosening with a simple structure. Therefore, it is possible to prevent the nozzle tip member from rotating due to vibrations or the like during use, and it is possible to always accurately spray the liquid onto the object without having to periodically retighten the cap.

External perspective view of a spray nozzle according to an embodiment Exploded perspective view of main parts of the spray nozzle in Figure 1 Vertical front view of the spray nozzle in Figure 1 Cross-sectional view along line IV-IV in Figure 3

Hereinafter, embodiments of the present invention will be described based on FIGS. 1 to 4. As shown in FIGS. 1 to 3, this spray nozzle includes a cylindrical nozzle body 1 having a liquid passage 1a penetratingly formed in the axial center and a male thread 1b formed on the outer periphery of the tip; A cap 2 that is screwed to the tip, a disc-shaped spray plate (nozzle tip member) 3 that is attached to the nozzle body 1 by the cap 2, and an annular seal member 4 that seals between the spray plate 3 and the nozzle body 1. , a core 5 disposed between the tip surface of the nozzle body 1 and the spray plate 3, an orifice plate 6 disposed in the liquid passage 1a near the rear end of the nozzle body 1, and a rear end surface of the nozzle body 1. A cylindrical packing 7 in close contact with each other, a filter 8 disposed inside the packing 7, a holder 9 that holds the rear end of the nozzle body 1, a union nut 10 that connects the holder 9 to the nozzle body 1, and a union A lock nut 11 is provided to prevent the nut 10 from loosening. A mechanism 12 for preventing the cap 2 from loosening relative to the nozzle body 1 (hereinafter referred to as a "locking mechanism") is provided between the nozzle body 1 and the cap 2.

The nozzle body 1 is provided with a pair of arc-shaped core receivers 1c on the inner periphery of the large diameter portion of the tip of the liquid passage 1a in a state that slightly protrudes from the tip surface of the nozzle body 1. A pair of pin holes 1d are provided in the stepped surface that forms the bottom of the diameter portion. Further, an air introduction hole 1e penetrating from the outer peripheral surface to the liquid passage 1a is provided in the longitudinal center portion, and a flange 1f for locking the union nut 10 is provided on the outer periphery of the rear end portion.

The cap 2 has a female thread 2a formed on its inner periphery to be screwed together with the male thread 1b of the nozzle body 1, and has an inner flange 2b at its tip. Then, with the spout plate 3 pressed against the tip surface of the nozzle body 1 via the seal member 4, the outer peripheral edge of the spout plate 3 is tightened with the inner flange 2b by screwing the spout plate 3 to the nozzle body 1. The plate 3 is fixed to the nozzle body 1 together with the seal member 4 and the core 5.

The spout plate 3 is formed with a bulging portion 3a having a U-shaped cross section extending along the radial direction, and the liquid supplied to the liquid passage 1a of the nozzle body 1 is disposed in the longitudinal center of the bulging portion 3a. A spout 3b is opened to emit water. The cap 2 is fixed to the tip of the nozzle body 1 with the nozzle 3b exposed.

The sealing member 4 is a general-purpose O-ring, and when the cap 2 is tightened, it is compressed between the spray plate 3 and the tip surface of the nozzle body 1, and the liquid flows between the spray plate 3 and the nozzle body 1. It is designed to be tightly sealed.

The core 5 adjusts the flow of the liquid mixed with the air sucked in from the air introduction hole 1e of the nozzle body 1 and passed through the liquid passage 1a, and the liquid flows through the passage 5a toward the spray plate 3. There are two. Further, a pair of positioning pins 5b are provided on the back surface (the surface on the nozzle body 1 side), and a pair of protrusions 5c are provided on the peripheral edge of the front surface (the surface on the spout plate 3 side). Each positioning pin 5b is inserted into the pin hole 1d of the nozzle body 1, and is assembled with a part of the peripheral edge of the back surface abutting the core receiver 1c of the nozzle body 1. During this assembly, each protrusion 5c of the core 5 fits into a groove on the back surface (the surface on the core 5 side) of the bulging portion 3a of the spout plate 3, so that the core 5 and the spout plate 3 are connected to each other. is positioned in the circumferential direction.

The holder 9 has a liquid introduction path 9a that communicates with the liquid passage 1a of the nozzle body 1 through the inner space of the packing 7, and has a tip portion that holds the rear end of the nozzle body 1 and the outer periphery of the packing 7. , a member connected to a liquid supply source (not shown) such as an external liquid guide pipe.

The union nut 10 has an inner flange 10a at its tip, and by screwing it to the tip of the holder 9, the inner flange 10a tightens the flange 1f of the nozzle body 1 to connect the nozzle body 1 to the holder 9. In this state, the lock nut 11 prevents loosening.

Here, among the above-mentioned members, the spray plate 3, the orifice plate 6, and the filter 8 are made of stainless steel, the seal member 4 and the packing 7 are made of rubber, and the other members are made of resin. Although the material of the member made of resin may be replaced with another material that is resistant to the liquid to be sprayed, it is preferable that the nozzle body 1 is made of resin, as will be described later.

As shown in FIGS. 3 and 4, the locking mechanism 12 that prevents the cap 2 from loosening with respect to the nozzle body 1 has sloped surfaces on both sides in the circumferential direction on the inner periphery of the cap 2 closer to the threaded tip than the female thread 2a. In addition, as shown in FIGS. 2 to 4, a cap is provided at a centrally symmetrical position on the outer periphery of the nozzle body 1 on the axial center side of the male thread 1b. A pair of engagement pieces 14 that engage with two engagement portions 13 are provided.

Each engagement piece 14 of the nozzle body 1 includes a support portion 14a that extends obliquely from the outer periphery of the nozzle body 1 to the radial direction, and a protrusion that is continuous to the distal end side of the support portion 14a and that is adjacent to the cap 2 in the circumferential direction. It consists of a convex portion 14b that fits into the valley between the support portions 13a, and is provided in a state that it can be displaced radially inward of the nozzle body 1 by bending and deforming the support portion 14a. Here, each engagement piece 14 is formed integrally with the nozzle body 1 from resin, and is designed so that an appropriate amount of displacement occurs due to deflection deformation of the support portion 14a.

By employing the locking mechanism 12 described above, when the spout plate 3 is fixed to the nozzle body 1 together with the sealing member 4 and the core 5, when the cap 2 is screwed to the tip of the nozzle body 1, the cap 2 The engaging portion 13 comes into contact with the convex portion 14b of each engaging piece 14 of the nozzle body 1. However, if the force for rotating the cap 2 is increased to a certain extent at this time, the protrusion 13a of the engagement part 13 will bend the support part 14a of the engagement piece 14 and displace it radially inward, causing the engagement piece 14 to The cap 2 can be smoothly tightened because it goes over the convex portion 14b. After the cap 2 is sufficiently tightened, the tightening can be completed with the protrusion 14b of the engagement piece 14 entering the valley between the protrusions 13a adjacent to each other in the circumferential direction of the cap 2. can.

In this manner, when the cap 2 is completely tightened and the engagement piece 14 of the nozzle body 1 is engaged with the engagement portion 13 of the cap 2, even if force is applied in the direction of loosening the cap 2 due to vibration or the like, As long as the force is not large enough to cause the protrusion 13a of the engagement portion 13 to overcome the convex portion 14b of the engagement piece 14, the cap 2 can be stably prevented from loosening.

On the other hand, when replacing the spout plate 3, etc., simply rotate the cap 2 with a certain amount of force in the opposite direction to the tightening direction, and the protrusion 13a of the engagement part 13 will engage the convex part 14b of the engagement piece 14. Since the cap 2 is climbed over, the cap 2 can be smoothly loosened and removed from the nozzle body 1.

This spray nozzle has the above-described configuration, and the liquid supplied from an external liquid supply source to the liquid introduction path 9a of the holder 9 passes through the filter 8 inside the packing 7 and flows into the liquid path 1a of the nozzle body 1. After passing through the orifice plate 6 and mixing with the air introduced from the air introduction hole 1e, the air is rectified as it passes through the flow path 5a of the core 5, and is formed into mist particles from the nozzle 3b of the spray plate 3. Injected.

Here, the cap 2 that fixes the spout plate 3 to the nozzle body 1 is prevented from loosening with respect to the nozzle body 1 by a loosening mechanism 12, and is not easily rotated due to vibrations or the like during use. Therefore, without having to periodically retighten the cap 2, the liquid can always be accurately sprayed onto the object, and the conventional troublesome work of retightening the cap can be eliminated.

Furthermore, the locking mechanism 12 is composed only of an engaging portion 13 formed on the inner periphery of the cap 2 and consisting of a plurality of chevron-shaped protrusions 13a, and an engaging piece 14 provided on the outer periphery of the nozzle body 1. , the structure is simple, and the number of parts of the entire spray nozzle does not increase.

Furthermore, since the engagement piece 14 of the nozzle body 1 has a support portion 14a extending diagonally from the outer periphery of the nozzle body 1 with respect to the radial direction, changing the length and cross-sectional area of the support portion 14a can The design of the resistance to loosening of the cap 2 (ease of attachment and detachment) can be easily adjusted.

It is sufficient that at least one engaging piece is provided on the outer periphery of the nozzle body, but if a plurality of engaging pieces are provided at equal intervals in the circumferential direction of the nozzle body as in this embodiment, the cap can be This is preferable because the rotating force is applied to the cap in a well-balanced manner.

The embodiments disclosed this time should be considered to be illustrative in all respects and not restrictive. The scope of the present invention is indicated by the scope of the claims, not the meaning described above, and is intended to include meanings equivalent to the scope of the claims and all changes within the scope.

For example, the engagement piece is not limited to the one in the embodiment, but may be any other piece as long as it is displaceable inward in the radial direction of the nozzle body by elastic deformation.

Moreover, the present invention can of course be applied to a spray nozzle incorporating a nozzle tip member (for example, a nozzle tip, etc.) other than the spray plate as in the embodiment.

1 Nozzle body 1a Liquid passage 1b Male thread 2 Cap 2a Female thread 3 Spray plate (nozzle tip member)
3b Spout 12 Locking mechanism 13 Engagement part 13a Protrusion 14 Engagement piece 14a Support part 14b Convex part

Claims (3)

A cylindrical nozzle body having a liquid passage formed through the shaft center and a male thread formed on the outer periphery of the tip, and a nozzle tip member having a spout for spouting liquid supplied to the liquid passage of the nozzle body. and a cap that is screwed to the tip of the nozzle body and fixes the nozzle tip member to the tip of the nozzle body with the nozzle exposed,
The cap is provided with an engaging portion in which a chevron-shaped projection having sloped surfaces on both sides in the circumferential direction continues in the circumferential direction on the inner periphery on the screwed-in tip side of the female thread that is screwed together with the male thread of the nozzle body,
The nozzle body is characterized in that an engaging piece that engages with the engaging portion of the cap is provided on the outer circumference of the nozzle body on the axially central side of the male thread so that it can be displaced radially inward by elastic deformation. spray nozzle. The engagement piece includes a support portion extending diagonally from the outer periphery of the nozzle body in the radial direction, and a valley between the protrusions that are continuous to the distal end side of the support portion and are adjacent to each other in the circumferential direction of the cap. 2. The spray nozzle according to claim 1, wherein the spray nozzle comprises a convex portion that enters the convex portion. The spray nozzle according to claim 1 or 2, wherein a plurality of the engagement pieces are provided at equal intervals in the circumferential direction of the nozzle body.

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