JPS60220159A - Spray nozzle - Google Patents

Abstract

PURPOSE:To enhance painting efficiency, by impinging air in front of an airless nozzle tip from a tail erasing air orifice and a slit orifice. CONSTITUTION:A paint 8 having predetermined liquid pressure is injected from a gun main body 1 through a nozzle top 6a. Because a slit orifice 7 is provided to a position in a pattern long diamter direction (a) coming to the vicinity of the tip 6a and air C is blown to said tip 6a, the tail part of the paint pattern 8 having the tail part generated at the time of injection is erased by air pressure and the particle group thereof is once deformed to a pattern 8b or 8c having a rounded shape to be directed to an atomization point. Air from the air orifice 5 of a cap 4 crosses a place subsequent to the atomization point at right angles and stretches the patterns 8b, 8c to a predetermined pattern 8d.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Field of Application> The present invention relates to an airless type barrier spray device vC, a spray nozzle to which an air nozzle is added.

〈Prior art〉 As a general retardation spray device, the impact of compressed air and the diffusion effect reduce the amount of debris! An air atomization system in which the material is atomized, and an airless (hydraulic pressure) atomization system in which the material is atomized by injecting it from a spray nozzle using high hydraulic pressure are widely used. Although there are other types of atomization such as electrical atomization and mechanical atomization, the two methods described above are the predominant types of devices that perform atomization 2 in obstetrics.

However, each method has its advantages and disadvantages. For example, about 1 oz for obstetrics with air spray
It uses o times the force of air, causing a lot of mist to scatter. Airless sprays have problems in that they cannot freely adjust the pattern and amount of spray, and that they tend to have pattern defects called tails.

Recently, in order to solve the above drawbacks, a spray device that combines airless atomization with five air atomization systems has appeared. I've started to see it. However, even with these devices, there is still much room for improvement, and a spray device that is easier to use and more efficient is desired.

<Objective of the Invention> In the present invention, is it possible to separately air and blow tail two patterns facing each other in the longitudinal direction near the nozzle tip exit? erasing and
Furthermore, apply other air from the short diameter direction of this pattern width,
The purpose is to be able to freely adjust the pattern width to a pattern width that exceeds the specifications of the nozzle chip.

<Structure of the Invention> The present invention includes an airless spray nozzle for hydraulic atomization having a substantially lip-shaped opening and forming an oval spray pattern at the center, and a longitudinal blowing position of the lip-shaped opening in front of the nozzle. In, this opening? A first nitrogen injection port for injecting substantially at least the injection before atomization is provided, and a flat gust of air is provided at a position orthogonal to the front of the first nitrogen injection port. It is equipped with a No. 29 nozzle that sprays air, and is a spray nozzle that can be changed even during a turn.

<Example> The present invention will be described in detail below based on the drawings of the example.

In Figures 1 and 2, the approximately lip-shaped opening placed in the center of the front of the spray gun body of the 1μ hydraulic spray TIG? The nozzle tip 6 is held by a nozzle holder 2 screwed into the gun body IVC. Furthermore, is there a cap nut 3 screwed into this nozzle holder 2? A cap 4 is attached thereto, and a slit hole 71ii of a constant width is provided between the nozzle tip 6 and the nozzle holder 2 for erasing tails, which is arranged on both sides of the tip opening 6a in the longitudinal direction.

Also, the cap 4Vr is located at a position perpendicular to the slit hole 7.
is for pattern width adjustment (VC6 shown is 3 pieces)
) is formed by opening an air hole 5 toward the tip port 6a side. The air hole 5 and the slit hole 7 are branched and communicated with an air passage 9 provided in the nozzle holder 2 part.

To explain this operation, first, like the conventional airless spray nozzles, the powder 8 having a predetermined hydraulic pressure is injected from the gun body through the nozzle tip 61il.

Here, position a in the long diameter direction of the pattern near the chip 6a is the slit hole 7? Since the air cf is blown, the tail part of the maternity butter 788 as shown in FIG. 5, which is generated at the time of injection, is erased by the suppression of the air, and the particle group forms -H pattern 8b or pattern 8.
After being deformed into a rounded shape C, it heads toward the atomization point.

Next, the air from the air hole 5 of the cap 4 is applied perpendicularly to the area after the atomization point of the sprayed paint, that is, by applying angled air in the short axis direction of the pattern width, the rounded shape is formed. The pattern 8b or *set is stretched to a predetermined oval pattern 8d suitable for painting. In this case, the number of air holes 5 and the air blowing depend on the pattern width?
It can be freely adjusted to a pattern width that exceeds the specifications of the nozzle tip. Further, the air is dispersed appropriately so as not to be concentrated at one point in the collision position of the large number of air holes 5, forming a band-shaped flat air flow. .

The fourth factor in FIG. 3 shows another embodiment of the air hole which is a slit hole and a square hole.

In this case, a slit hole 7 is bored all around the vicinity of the nozzle tip 6, and a slit-like air hole 5 is used as a hole for blowing air toward the rear of the binding point.

That is, pattern 2 of paint 8 sprayed from nozzle tip 6
The circular spray pattern allows uniform mist to be dispersed over a wider width than the slit-shaped air holes 5, resulting in a pattern-controlled airflow.

<Effects of the Invention> As described above, the spray nozzle of the present invention has a tail erasing air hole and a slit hole in front of the airless nozzle tip. By having a structure in which air is further blown through numerous holes or slit holes for atomization breather,
Pattern changes are possible due to large pattern changes and efficiency with small airflow. Therefore, even if the spray pressure is low, the tail can be eliminated, so spraying can be performed at low pressure, and the heavy deposition efficiency is high.
Atomization is improved. In addition, since the turn width can be freely changed, the range of protection of the two individual nozzle tips becomes wider.
This has effects such as being able to reduce the number of types of nozzle chips.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, in which Fig. 1 is a longitudinal sectional side view of the main part, Fig. 2 is a front view, Fig. 3 is a longitudinal sectional side view of the main part of another embodiment, and Fig. 4 is a rotational front view. FIG. 5 is an explanatory diagram of the pattern. l...Gun body 2...Tsuzuru presser foot 4...Cap 5,5...
...Air hole 6...Nozzle tip
? , 7... Slit hole No. 3r, Fig. 4 罷昭Go-220159 (4) Fig. 5 a Φ (base e h

Claims (1)

[Claims] 1. An airless spray nozzle for hydraulic atomization having a lip-shaped opening and forming an oval spray pattern is disposed at the center, and the lip-shaped opening in front of the nozzle is opposite in the longitudinal direction. The first part has an opening at the position and is injected into the injector before atomization.
A spray characterized in that a sudden air injection port is provided, and a second sudden air injection port is further provided at a position orthogonal to the front of the twelfth air injection port for injecting a flat entire airflow into the obstetric area after atomization. nozzle. Z. The spray nozzle according to claim 1, wherein the first nitrogen injection port is formed by an annular slit formed around the nozzle. 3. The spray nozzle according to claim 1, wherein the second air injection port comprises a plurality of holes arranged in parallel. 4. The spray nozzle according to claim 1, wherein the second air injection port is an elongated slit-shaped opening.