JPH0634858Y2 - Liquid bubble injector nozzle - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Industrial Field of the Invention The present invention relates to an improvement of a nozzle cap mounted on the tip of an injection cylinder of a trigger type liquid foam injector.

2. Description of the Related Art A conventional trigger-type liquid bubble injector is shown in FIGS. 2 and 3 in which a simplified diagram of an example is shown. The liquid is sucked from the device, the trigger 1 is pulled in this state, and the piston 2 is pushed into the pump chamber to increase the pressure in the pump chamber. The high-pressure liquid opens the ejection valve to inject the liquid into the injection cylinder 4 Through the nozzle hole of the nozzle cap 5.

In FIG. 2, reference numeral 11 denotes a liquid guide body internally fitted and fixed to the tip end portion of the injection cylinder 4, and the nozzle body 8 has a nozzle hole 7 formed at the center of the front surface thereof to form the liquid guide body 11.
A short tube portion 13 is rotatably fitted in a plug body 12 at a tip end portion, and a nozzle cap 5 is formed by the nozzle body 8, the liquid guide body 11, and a foaming tube 9.

As shown in FIG. 2, the nozzle cap 5 is provided with a foam forming cylinder 9 in the front surface of the nozzle hole 7 of the nozzle body 8, and the foam forming inner cylinder surface 10 of the foam forming cylinder 9 is a unit. There is known a cylindrical body having a single smooth inner cylindrical surface, in which a liquid ejected from the nozzle hole 7 is ejected and collides with the inner cylindrical surface 10 to perform a reflective foaming action. It was

Problems to be Solved by the Invention As a conventional foam forming means, a foam forming cylinder 9 is arranged in the front surface portion of the nozzle hole 7 of the nozzle body 8, but the foam forming cylinder 9 has a simple tubular shape. Since the foam-forming inner cylinder surface 10 is formed as a single smooth surface, the collision reflection of the jet liquid sprayed from the nozzle hole 7 toward the inner cylinder surface 10 has little change, and the foam formation is effective. It is difficult to say that the inner cylindrical surface 10 is merely a smooth surface, so effective resistance cannot be given even if collision occurs depending on the viscosity of the injection liquid, and the reflection of the injection liquid is efficient. There was a drawback that the desired foaming effect was not obtained.

Object of the Invention In view of the above-mentioned situation, the present invention can employ a foam cylinder having a simple structure, and can satisfy various performances required for a nozzle for a liquid foam injector, and a liquid having a low viscosity and a good foaming property. It is an object of the present invention to provide a nozzle for a liquid bubble-like ejector, which has a good foaming effect, has low resistance when ejected, and can obtain ejected bubbles in a wide pattern.

Means for Solving the Problems In order to achieve the above-mentioned object, the present invention provides a foam-making cylinder which penetrates the foam-forming inner cylinder surface immediately before the liquid injection nozzle hole. The axis is aligned with the axis of the nozzle hole, and the peripheral surface of the inner surface of the foam-forming surface that is closer to the nozzle hole is an uneven cylindrical surface, and the other peripheral surface is a smooth cylindrical surface that ends at the foam-forming jet. The inner diameter of the smooth cylindrical surface is larger than the maximum inner diameter of the uneven cylindrical surface.

Effects Since the present invention has the above-mentioned configuration, when the viscosity of the jet liquid jetted from the nozzle hole is relatively low, the jet liquid collides and is reflected by the uneven surface of the inner peripheral surface of the foam forming cylinder. Foaming is performed by taking in the intake air sucked from the air intake hole by the action of the jet flow of the injection liquid. Therefore, compared to the conventional tubular foam-making cylinder formed by a mere smooth inner wall surface, the ejection liquid from the nozzle hole is subjected to complex reflection due to the uneven surface, thus improving the bubbling, and the ejection liquid after the change in reflection is Passing through the large diameter smooth cylindrical surface that is the other peripheral surface of the uneven surface,
Since the foamed jetting liquid is jetted from the jetting port with relatively little resistance, the jetting of a wide pattern can be effectively obtained.

Embodiment FIG. 1 shows an embodiment of the present invention. Of the components shown below, the same components as those shown in FIG. 2 are designated by the same reference numerals. It shall be.

In FIG. 1, reference numeral 11 denotes a liquid guide body internally fitted and fixed to the tip end portion of the injection cylinder 4, and the nozzle body 8 has a nozzle hole 7 formed in the center portion of the front surface thereof to form the liquid guide body 11.
A short tube portion 13 is fitted in the tip end plug body 12, and a nozzle cap 6 is formed by the nozzle body 8, the liquid guide body 11, and a foaming tube 17 described later.

Although not shown, as in the case of FIG. 2, shallow grooves 10, 10 are formed on the peripheral surface of the front end portion of the plug body 12 in the generatrix direction at a plurality of positions in the circumferential direction from the front end surface over a certain section. On the other hand, the liquid passage is formed on the inner peripheral surface of the projecting end portion 14 of the short tubular portion 13.
15, 15 are formed over a certain section from the end portion 14 in the generatrix direction at a plurality of positions in the circumferential direction.

The shallow grooves 10, 10 are communicated with the liquid passages 15, 15 and the spin groove 16 located on the rear surface of the nozzle hole 7, and therefore the high-pressure liquid passes through the spin grooves 16 from the liquid passages 15, 15. Then, it is ejected in a mist form from the nozzle hole 7 to collide with an inner wall surface 18 of a foam-forming cylinder 17, which will be described later, to form a foam. The foam forming cylinder 17 is integrally formed with a large-diameter mounting cylinder 19 on the outer peripheral portion, and is fitted and fixed to a peripheral wall 20 projecting to the front side of the nozzle body 8, and the foam forming inner cylinder surface 18 is formed.
Are disposed immediately in front of the nozzle hole 7 with a proper gap 21 therebetween and penetrate toward the nozzle hole 7. The foam forming cylinder 17 and the mounting cylinder 19 are integrated by a front end plate 22, and several air intake holes 23 are opened in the end plate 22 in the circumferential direction.
Communicates with the void 21. Further, an engaging projection 24 is arranged on the outer peripheral surface of the mounting cylinder 19, while an engaging recess 25 is arranged on the inner surface of the peripheral wall 20, and the mounting cylinder 19 includes the projection 24 and the recess. It is fixed to the peripheral wall 20 by engagement with 25.
The axis line of the foam-forming inner cylinder surface 18 is aligned with the axis line of the nozzle hole 7, and the uneven cylindrical surface 26, which is the uneven portion of the foam-making inner cylinder surface 18, is a nozzle so that the injection liquid from the nozzle hole 7 collides. It is formed on the peripheral surface on the side close to the hole 7, and the shape of the concave and convex portion is a shape in which a plurality of ring-shaped protrusions 27 are projected in the circumferential direction, and the other peripheral surface is the concave and convex cylindrical surface 26. The end surface of the foam forming jet 28 is formed into a smooth smooth cylindrical surface 29, and the inner diameter D ₁ of the smooth cylindrical surface 29 is larger than the maximum inner diameter of the uneven cylindrical surface 26 by D _2. Has been done.

The angle at which the liquid (fog) ejected from the nozzle hole 7 diffuses differs depending on the viscosity and foamability of the ejected liquid. Therefore, it is desirable to devise the shape of the uneven cylindrical surface 26 based on the characteristics of the liquid to be ejected. In the case of a liquid having a low viscosity and a good foaming property, the liquid is diffused and ejected from the nozzle hole 7 at a wide angle, so that the nozzle hole 7 of the inner cylindrical surface 18 is
It will be diffused at a close position. Therefore, the range in which the low-viscosity liquid comes into contact with the concavo-convex cylindrical surface 26 is the foam-forming inner cylindrical surface 18
The peripheral surface is close to the nozzle hole 7.

Therefore, if the concavo-convex cylindrical surface 26 is formed too long in the axial direction,
Since the resistance of the concavo-convex cylindrical surface 26 against the liquid ejected from the nozzle hole 7 becomes large and the ejection pressure of the liquid ejected from the foam-forming ejection port 28 becomes small, the length of the concavo-convex cylindrical surface 26 becomes It is selected according to the type of liquid. Further, in order to reduce the resistance of the foam-forming inner cylinder surface 18 to the jetted liquid, while providing a smooth cylinder surface 29 which is a peripheral surface of the foam-forming inner cylinder surface 18 on which the uneven cylinder surface 26 is not provided, Smooth cylinder surface 29
Since the inner diameter D ₁ is larger than the maximum inner diameter D ₂ of the concavo-convex cylindrical surface 26, the resistance on the smooth cylindrical surface 29 is eliminated, and the ejection pressure of the liquid from the ejection port 28 increases and the ejection pattern is simultaneously formed. You can change it as you want.

The concavo-convex cylindrical surface 26 of the foam-forming inner cylindrical surface 18 is formed mainly in the latter half part in the axial direction near the nozzle hole 7 where the jet liquid from the nozzle hole 7 collides, and the entire inner cylindrical surface 18 is formed. It is preferable not to provide it. This is because if it is provided on the entire inner cylindrical surface 18, the resistance to the injected liquid becomes too large, and the injection pressure decreases. And as mentioned above, the uneven cylindrical surface 18
The axial length of the peripheral surface on which is provided depends on the viscosity of the liquid.

The shape of the foam-forming inner cylindrical surface 18 is not limited to the shape as shown in FIG. 1, but may be any other shape as long as the inner wall surface has an uneven shape. For example, a groove is spirally recessed on the inner wall of the inner cylindrical surface 18 to make the inner wall surface uneven, or a plurality of ring-shaped circumferential grooves are circumferentially recessed on the inner wall surface, or an inner wall surface. There are multiple protrusions on the inner surface to make it uneven, or a plurality of small holes are recessed on the inner wall surface. The shape may be uneven. In each of the above-mentioned examples, the foaming cylinder 17 is formed separately from the nozzle main body 8 but may be formed integrally with the nozzle main body 8. In this case, although not shown, the foam-making cylinder 17 may be integrally formed so as to project from the front wall of the outer surface of the nozzle hole 7.

In this way, when the foam forming cylinder 17 is integrated with the nozzle body 8,
It is desirable to provide the air intake holes on the side portions, because if the air intake holes are provided on the front surface side, it becomes impossible to perform die cutting.

Because of the above-mentioned structure, the nozzle body 8 can be rotated, and three kinds of states of bubbles, direct and closed, that is, the inner solution in the form of bubbles or the inner solution as it is in the form of water column, and any of them can be used. Assuming that the structure is such that three states can be selected to prevent clogging, for example, FIG. 1 shows the position of "foam", and the shallow grooves 10 and 10 are the liquid passages 15 and 15 and the rear surface of the nozzle hole 7. The spin groove 16 located at the position is communicated with the spin groove 16. Therefore, the high-pressure liquid is ejected through the spin groove 16 from the nozzle hole 7 in a mist state, and the injection pressure of the high-pressure injection liquid causes the air passage reaching the gap 21 to become a negative pressure. The air sucked from the air intake hole 23 is sucked from the gap 21 to the concave and convex cylindrical surface 26, mixed and agitated with the jetted liquid, and the desired foaming is obtained on the foaming inner cylindrical surface 18. A wider pattern of ejection bubbles can be obtained than the ejection port 28. Further, when the nozzle body 8 is rotated to connect the deep grooves, which are not shown in the drawing and are arranged in different directions, to the liquid passages 11 and 11 and the nozzle hole 7, the high-pressure liquid spins. Without being ejected directly from the nozzle hole 7 into a water column.

Further, the portion where the shallow groove 10, 10 of the plug body 12 is not provided by rotating the nozzle body 8 is provided between the shallow groove 10, 10 and the liquid passages 15, 15, the nozzle hole 7, and the spin groove 16. When it is positioned so as to block it and the communication is cut off, the ejection is stopped. The above-mentioned parts are molded and made of synthetic resin.

Effect The present invention has the above-described configuration and operation, and when the foaming cylinder having a simple structure can be used for the nozzle of the liquid foaming injector and the liquid has a relatively low viscosity and a good foaming property. , If you select a foaming cylinder with a foaming inner cylinder surface that has a concave-convex surface with a shape that corresponds to the characteristics such as foaming properties, a change in the reflection of the jetting liquid that corresponds to the viscosity can be obtained, and foaming is effective. By virtue of the configuration in which the tip opening diameter is wider than that of the concave-convex portion, there is an effect that the resistance to the jetting liquid is reduced, and a wide pattern of jet bubbles can be obtained.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing an outline of the structure of a nozzle cap of an embodiment, FIG. 2 is a vertical sectional view showing the structure of a conventional nozzle cap, and FIG. 3 is a simplified view of a trigger type liquid ejector. 7: Liquid injection nozzle hole, 17: Foaming cylinder, 18: Foaming inner cylinder surface, 26:
Concavo-convex cylinder surface, 28: Foaming jet, 29: Smooth cylinder surface, D ₁ : Smooth cylinder surface inner diameter, D ₂ : Concavo-convex cylinder surface maximum inner diameter.

Claims (1)

[Scope of utility model registration request] 1. A foam-making cylinder penetrating the inner surface of the foam-making cylinder is provided immediately before the liquid injection nozzle hole, and the axis of the inner surface of the foam-making cylinder is made to coincide with the axis of the nozzle hole. The peripheral surface of the inner surface of the foam-forming surface close to the nozzle hole is a concavo-convex cylindrical surface, and the other peripheral surface is a smooth cylindrical surface that ends at the foam-forming ejection port, and the inner diameter of the smooth cylindrical surface is uneven. A nozzle for a liquid bubble ejector, wherein the nozzle has a diameter larger than the maximum inner diameter of the cylindrical surface.