JP2007245044A - Liquid spray nozzle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a plastic made liquid spray nozzle for introducing compressed air and liquid inside, mixing them and spraying the mixture, the liquid spray nozzle being constituted in such a manner that the leakage of liquid from the nozzle tip hardly occurs. <P>SOLUTION: The liquid spray nozzle (1) has: at the distal end, a spray port (11a); at the other end, an air introducing port (11b) to which a compressed air supply means (2) is connected; in the peripheral surface, a liquid introducing port (12b) to which a liquid storage means (3) is connected; and in the inside, an air flow passage (11C) communicating with the air introducing port (11b), a liquid flow passage (13b) communicating with the liquid introducing port (12b) and crossing the air flow passage (11b), and a mixing flow passage (11d) communicating with the spray port (11a) from the crossing part, wherein the spray port (11a) is arranged nearly direct above the liquid introducing port (12b) and the crossing part of the air flow passage (11c) to the liquid flow passage (13b) is provided in the vicinity of the spray port (11a). A plurality of air feeding ports (11f) are formed around the spray port (11a). <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention is a plastic liquid ejection nozzle that is used by being integrally attached to an air ejection end of a compressed air supply means such as an air gun, and introduces compressed air into the liquid from a liquid storage means such as a storage tank. Is sucked out, mixed with air and ejected from a jet outlet.

When supplying a liquid such as a cleaning liquid or a rust preventive liquid to a liquid passage inside the mold, an air gun 51 for ejecting compressed air and a liquid storage tank 52 filled with a liquid to be ejected are shown in FIG. A liquid supply tool including a nozzle 53 attached integrally to the air ejection end 51a of the air gun 51 is used.
Specifically, the liquid storage tank 52 has a wall surface that expands and contracts in an accordion manner, and is attached to the lower portion of the nozzle 53 attached to the air gun 51. Further, as shown in FIG. 6, the nozzle 53 includes an air inlet 53 b connected to the nozzle 53 a at the tip, an air outlet 51 a of the air gun 51 at the other end, and a mouth 52 a of the liquid storage tank 52 on the lower peripheral surface. Has a liquid introduction port 53c connected thereto, an air flow channel 53d communicating with the air introduction port 53b therein, a liquid flow channel 53e communicating with the liquid introduction port 53c and intersecting the air flow channel 53d, and the flow channel Each channel of a tubular mixing channel 53f that communicates with the jet port 53a from the intersecting portion is provided and is integrally formed.
The liquid supply tool sucks the liquid in the liquid storage tank 52 into the nozzle by blowing compressed air from the air gun 51 into the nozzle 53 to bring the downstream side of the liquid flow path 53e into a negative pressure state. It mixes with air, and this is ejected from the nozzle 53a of the nozzle front-end | tip (for example, refer patent document 1).

Japanese Patent Laying-Open No. 2005-14339 (FIGS. 13, 14, and 19 to 22).

In the nozzle 53 shown in the prior art, the tip of which is elongated and formed in a tubular shape, it is possible to reliably inject liquid into a confined narrow part such as the inside of a mold.
However, since the liquid is ejected linearly from the ejection port 53a, for example, when the liquid is ejected on a wide surface, the liquid adheres to the surface, and the liquid is uniformly coated with a uniform concentration. It was difficult. Further, when the liquid is ejected from the nozzle 53, there is a problem that the liquid soot leaks from the spout 53a.

  In view of such problems of the prior art, the present invention can eject a liquid jet nozzle made of plastic that introduces and mixes compressed air and liquid into the interior, and sprays the liquid in a mist form. It is an object of the present invention to configure so that the liquid does not easily leak from the nozzle tip.

  Liquid leakage from the tip of the nozzle collides with and adheres to the inner wall surface of the flow path in the process where the liquid that collides with the compressed air in the nozzle and mixes with the compressed air scatters and passes through the tubular mixing flow path. This is considered to be due to the granularity, which is caused by dripping down to the jet outlet while increasing the particle size. Therefore, if the tubular portion at the tip of the nozzle is shortened, the amount of liquid that collides with the inner wall surface of the flow path is reduced, making it difficult for liquid to leak, and from the intersection of the flow paths where the compressed air and liquid mix inside the nozzle. By shortening the distance to the jet outlet, the liquid that has collided with the compressed air inside the nozzle and has become mist can be ejected as it is.

Therefore, the present invention has an air inlet having a jet outlet at the tip, an air inlet to which the compressed air supply means is connected at the other end, a liquid inlet having a liquid reservoir connected to the peripheral surface, and an air communicating with the air inlet inside. The flow path, the liquid flow path that communicates with the liquid introduction port and intersects the air flow path, and the mixing flow path that communicates from the intersecting portion of the flow path to the jet outlet are integrally formed. The liquid ejection nozzle is configured such that the ejection port is disposed immediately above the liquid introduction port, and an intersection portion of the air flow channel and the liquid flow channel is provided in the vicinity of the ejection port.
According to this, since the intersection part of an air flow path and a liquid flow path is provided in the vicinity of a jet nozzle, the liquid which collided with compressed air at this intersection part and sprayed is sprayed out from a jet nozzle as it is. In addition, since the mixing flow path from the intersection to the jet outlet is short, the amount of the liquid adhering to the inner wall surface of the flow path is very small and hardly becomes granular, and the liquid is prevented from leaking from the nozzle tip. be able to.

In the nozzle configured as described above, if a plurality of air delivery holes are formed around the ejection port and the compressed air introduced into the nozzle from the air introduction port is ejected from the air delivery hole, the ejection is ejected from the ejection port. A compressed air delivery path (air curtain) is formed in front of the nozzle around the liquid, thereby suppressing the mist-like ejected liquid from spreading in front of the nozzle, and the ejection direction between the air delivery hole and the air delivery hole. Can be regulated.
Furthermore, if a projecting piece extending in the axial direction of the ejection port is provided outside the air delivery hole, the straightness of the ejection liquid can be increased together with the compressed air ejected from the air delivery hole. You may provide a cylindrical cover in the outer peripheral part of the air delivery hole of a nozzle front-end | tip.
A plurality of air delivery holes are formed around the jet outlet, and these are preferably formed so as to sandwich the jet outlet and are spaced apart from each other along the circumferential direction of the jet outlet. The projecting width of the projecting piece or the cylindrical cover is appropriately set according to the opening diameter of the ejection port.

  As the compressed air supply means for blowing compressed air into the nozzle, an appropriate device or instrument that can be attached to the air inlet of the nozzle and blown compressed air, such as a compressor, pump, or air gun, can be used. . In addition, the liquid storage means includes a mouth portion that is compactly attached to the liquid inlet port of the nozzle and can be filled with an appropriate volume of liquid to be ejected. A structure that expands and contracts with the outflow, for example, a liquid storage tank having a bellows-type wall surface can be used.

A preferred embodiment of the present invention will be described with reference to the drawings.
1 to 3 show an embodiment of the nozzle of the present invention. The nozzle of the present invention is integrally molded by injection molding using a synthetic resin. As shown in the figure, the nozzle 1 has a cylindrical neck portion on the lower peripheral surface of a bell-shaped main body portion 11 which is turned sideways. A cylindrical lid portion 12 having a diameter larger than that of the lid portion 12 is arranged through the outer circumferential surface 13, and the flange 14 is formed on the outer peripheral surface extending from both upper side edges of the lid portion 12 to the upper portion of the main body portion 11. It is.

More specifically, as shown in FIG. 2, the main body 11 of the nozzle 1 has a spout 11a formed at the center of the tapered front end surface, and the rear end is wide open in a hollow shape so that the compressed air is compressed. The air introduction port 11b is connected to the supply means 2, and the jet port 11a and the air introduction port 11b are communicated with each other through an air flow channel 11c and a mixing flow channel 11d. A concave groove 11e is formed in the inner peripheral surface of the air introduction port 11b to fit the outer peripheral portion of the air ejection end 21 of the compressed air supply means 2.
In the air flow path 11c, the inner diameter gradually decreases from the rear end opening face facing the air introduction port 11b to the front end side, and the inner diameter of the front end opening face connected to the mixing flow path 11d is set to be the smallest. The mixing channel 11d is set to have an inner diameter slightly larger than the opening surface of the front end of the air channel 11c and communicates with the ejection port 11a. Both flow paths are provided on the same axis as the jet nozzle 11a.

  In addition, a pair of air delivery holes 11f and 11f are formed on the left and right sides of the ejection port 11a on the distal end surface of the main body portion 11. As shown in FIG. 3, the two air delivery holes 11f and 11f communicate with air delivery paths 11g and 11g formed inside the main body 11 and leading to the air outlet 11b, respectively, and are supplied with compressed air supply means. A part of the compressed air blown into the main body 11 from 2 is sent to the front of the nozzle from the air delivery holes 11f and 11f. In addition, the opening diameter of the air delivery holes 11f and 11f is made smaller than the jet nozzle 11a.

The lid portion 12 of the nozzle 1 has a cylindrical shape that is externally fitted and connected to the mouth portion 31 of the liquid storage means 3, and a tube portion 12 a that is inserted into the inner periphery of the mouth portion 31 is provided on the inner side thereof. The lower opening surface on which the part 31 is mounted is used as the liquid inlet 12b.
The neck portion 13 has a cylindrical shape smaller in diameter than the lid portion 12 and is provided between the lower peripheral surface of the main body portion 11 and the top portion of the lid portion 12, and the inside thereof serves as an opening portion 13 a that communicates with the tube portion 12 a. In the center of the top surface of the opening, there is provided a liquid channel 13b that extends upward and connects to a root portion that communicates with the air channel 11c of the mixing channel 11d at a substantially right angle. The liquid channel 13b has its inner diameter gradually narrowed from the lower end opening surface facing the opening 13a, and the inner diameter of the upper end opening surface connected to the mixing channel 11d is set to be the smallest. In addition, the neck part 13 is provided in the thickness from which the outer peripheral surface becomes the surface substantially the same as the front end surface of the main-body part 11 in which the jet nozzle 11a was formed.

  The nozzle 1 of the present embodiment formed in this way has the mouth 31 of the liquid reservoir 3 in which the air ejection end 21 of the compressed air supply means 2 is filled in the air introduction port 11b of the main body 11 and the liquid to be ejected is filled. Are connected to the liquid inlets 12b of the lid part 12 and the compressed air supply means 2 is operated in this state to blow the compressed air into the main body part 11, so that the compressed air passes through the air flow path 11c. Since the downstream side of the liquid flow path 13b that flows into the flow path 11d and intersects the mixing flow path 11d due to the differential pressure in both flow paths is in a negative pressure state, the liquid in the liquid storage means 3 is sucked into the liquid flow path 13b. The liquid is discharged from the flow path into the mixing flow path 11d, collides with the compressed air, mixes with the air, forms a mist, and is ejected from the ejection port 11a to the front of the nozzle 1.

In this case, the nozzle 11a of the nozzle 1 of the present embodiment is arranged on the substantially same surface as the outer peripheral surface of the neck 13 and directly above the liquid inlet 12b. The length of the mixing channel 11d is longer than that of the conventional nozzle. That is, the distance from the intersection of the air flow path 11c and the liquid flow path 13b to the ejection port 11a is extremely shortened. Therefore, the amount of liquid adhering to the inner wall surface of the mixing channel 11d is suppressed to a very small level in the process in which the liquid that has flowed into the mixing channel 11d and mixed with air scatters to the ejection port 11a. The liquid is prevented from becoming granular in the passage 11d, and the liquid is prevented from leaking from the tip of the nozzle 1.
Further, since the mixing channel 11d is extremely short, the liquid that collides with the compressed air in the channel and becomes mist is directly ejected from the ejection port 11a, and the fine particle liquid is ejected onto the ejection surface. It is possible to coat the surface to a uniform concentration.

  Further, in the nozzle 1 of the present embodiment, air delivery holes 11f and 11f are formed on both sides of the ejection port 11a, and at the same time as mist-like liquid is ejected from the ejection port 11a, the air delivery holes 11f and 11f Compressed air is ejected (see the broken line in FIG. 3). By sending out this air, an air curtain extending from both sides of the jet outlet 11a is formed in front of the nozzle 1, thereby suppressing the mist-like jet liquid from diffusing from the jet outlet 11a and changing the liquid jet direction. It is possible to restrict between the air delivery holes 11f and 11f.

  FIG. 4 shows another embodiment of the nozzle of the present invention. In FIG. 4A, protrusions 11h and 11h extending in the axial direction of the jet port 11a are provided outside the air delivery holes 11f and 11f. The diffusion of the compressed air ejected from both the air delivery holes 11f and 11f is regulated so that the mist-like ejected liquid ejected from the ejection port 11a is scattered more straightly forward of the nozzle 1. is there. Instead of the projecting pieces 11h and 11h, as shown in FIG. 5B, a cylindrical cover 11i extending in front of the nozzle is provided at the outer peripheral portion of the air delivery hole 11f and 11f at the tip of the nozzle 1. May be.

  In addition, a pair of air delivery holes 11f provided around the jet outlet 11a may be provided on both the left and right sides of the jet outlet 11a as shown in the figure, or three or more may be provided around the jet outlet 11a at equal intervals. Good. The illustrated form is an example, and the configuration of the liquid ejection nozzle of the present invention is not limited to these.

It is a perspective view of one embodiment of the liquid ejection nozzle of the present invention. It is a cross-sectional view of the nozzle of FIG. It is sectional drawing along the III-III line in FIG. (A), (B) is the perspective view of other embodiment of a liquid jet nozzle, and sectional drawing along the axial direction of a jet nozzle. It is the figure which showed the structure of the conventional liquid supply tool. It is sectional drawing of the nozzle of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Nozzle, 11 Main-body part, 11a Outlet, 11b Air inlet, 11c Air flow path, 11d Mixing flow path, 11f Air delivery hole, 11h Protruding piece, 12 Lid part, 12b Liquid inlet, 13 Neck part, 13b Liquid flow Path, 2 compressed air supply means, 3 liquid storage means

Claims (3)

A nozzle (11a) at the tip, an air inlet (11b) to which the compressed air supply means (2) is connected at the other end, and a liquid inlet (12b) to which the liquid storage means (3) is connected at the peripheral surface; An air flow path (11c) communicating with the air introduction port (11b), a liquid flow path (13b) communicating with the liquid introduction port (12b) and intersecting the air flow path (11b), and the flow In the liquid ejection nozzle (1) formed integrally with the mixing channel (11d) communicating with the ejection port (11a) from the intersecting portion of the path,
The jet outlet (11a) is arranged substantially immediately above the liquid inlet (12b), and an intersection part of the air flow path (11c) and the liquid flow path (13b) is provided in the vicinity of the jet outlet (11a). A liquid ejection nozzle characterized by being provided.   A plurality of air delivery holes (11f) are formed around the ejection port (11a), and the compressed air introduced into the nozzle from the air introduction port (11b) is ejected from the air delivery hole (11f). The liquid ejection nozzle according to claim 1. The liquid ejection nozzle according to claim 2, wherein a projecting piece (11h) extending in the axial direction of the ejection port (11a) is provided outside the air delivery hole (11f).

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