JPS6229081Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a liquid spraying device used for spraying a liquid such as paint.

Conventionally, there have been various types of liquid spraying devices that spray liquid from a lip-like orifice-type spray opening and supply airflow from around or behind the opening while enveloping the sprayed liquid and guiding it forward. being developed. However, in this type of device, in order to not disturb the spray, the air flow is generally supplied along the spray from a jet port located behind the spray port, so the sprayed liquid film flow does not occur. Probably because the collision with the air flow is slow, the atomization efficiency is low, and when the supply air pressure is increased to improve the atomization efficiency, the spray shape becomes disordered.

The present invention has been developed in view of the drawbacks of the prior art described above, and is designed to spray liquid under relatively high pressure from a lip-like orifice-type liquid spout, and to spray a liquid at a relatively high pressure from a lip-shaped orifice-type liquid spout, and to spray a liquid from a lip-shaped orifice type liquid spout, and to Relatively low-pressure air is ejected in a fan shape from the lip-shaped orifice-shaped blowhole, and this air flow wraps around the atomized liquid, keeping the atomized shape undisturbed and preventing the formation of tails, thereby improving atomization. It is an object of the present invention to provide a liquid spraying device that achieves acceleration.

In order to achieve the above object, the present invention forms a lip-like orifice-type liquid spout 4 in order to spray relatively high-pressure liquid supplied through a pressure liquid supply path in a fan-shaped pattern. Spray nozzle 1;
In order to form a pattern by wrapping the sprayed liquid from the spray nozzle in a fan shape using relatively low pressure air supplied through the pressure air supply path, a lip-shaped orifice is formed by the intersection of the concave cavity 9 and the groove 10. The spray nozzle 8 has a jet nozzle 8 having a molded jet nozzle 11 formed therein, the spray nozzle 1 is provided in a state covered by the concave cavity 9 of the jet nozzle 8, and the jet nozzle 1 has a jet nozzle 8 having a molded jet nozzle 11 formed therein.
The reason is that it is configured to be located in front of the orifice type liquid spout 4.

In a liquid spray device configured in this way, by supplying relatively low-pressure air to the jet nozzle, the air flows along the inner surface of the concave cavity, and the fan-shaped air is emitted from the orifice-shaped jet port. By supplying relatively high-pressure liquid to the spray nozzle, the liquid is sprayed and atomized in a fan-shaped pattern by the liquid pressure from the orifice-shaped spray opening. At this time, the atomized liquid from the atomizing nozzle passes through the fan-shaped airflow while being enveloped, and during this time the spray pattern is formed to prevent the occurrence of tails and ensure reliable atomization. is promoted.

Hereinafter, the present invention will be described in detail based on embodiments shown in the drawings.

First, in FIGS. 1 to 3, reference numeral 1 denotes a spray nozzle with a hemispherical tip;
A lip-like orifice-type liquid spout 4 is formed at the tip end of the dome-shaped concave cavity 2 and the V-shaped groove 3 intersecting each other. Reference numeral 5 denotes a holder for holding the spray nozzle 1, and a protrusion 5A is provided at the center of the holder 5.
A stepped hole 6 is formed in the axial direction, and a large number of ventilation passages 7 are formed in a circular row around the periphery. The spray nozzle 1 is press-fitted into the stepped hole 6 so that its tip slightly protrudes from the protrusion 5A of the holder 5.

8 is a jet nozzle having a large diameter flange 8A on one side and a small diameter protrusion 8B on the other side, and the jet nozzle 8 has a dome-shaped or bowl-shaped recess extending from the flange 8A side to the projection 8B side. A cavity 9 is bored, and a V-shaped groove 10 is carved in the protrusion 8B, and the intersection of the cavity 9 and the groove 10 forms a lip-like orifice-type blowhole 11.

Reference numeral 12 denotes a spray gun in which a pressure liquid supply channel 13 and a pressure air supply channel 14 are formed, and the spray nozzle 1 is attached to the tip side of the spray gun 12 together with a holder 5 in a liquid-tight manner through a seal 15. will be placed.

On the other hand, the spray nozzle 8 is arranged in front of the spray nozzle 1 such that its flange portion 8A is in contact with the front surface of the holder 5, and as a result, the spray nozzle 1 is located in the concave hole 9 of the spray nozzle 8 together with the protruding portion 5A of the holder 5. It is placed in a covered state. The holder 5 and the jet nozzle 8 are firmly fastened to the tip side of the spray gun 12 so that the outer edges thereof are held by a nut 16.

In this way, a semi-spherical space 17 is formed between the concave hole 9 of the spray nozzle 8 and the protrusion 5A of the spray nozzle 1 and the holder 5 over the entire circumference, and the space 17 is in contact with the front surface of the holder 5. It communicates with the ventilation passage 7 via an annular ventilation passage 18 formed between the flange portion 8A of the jet nozzle 8 and the flange portion 8A.

At this time, it is important to arrange the spray nozzle 1 behind the jet nozzle 8 so that it is covered by the concave hole 9, and as shown in FIG. 1, the bottom of the groove 3 in the spray nozzle 1 It is preferable that the tip of the spray nozzle 1 be positioned at least in line with the bottom of the groove 10 in the jet nozzle 8 or slightly rearward, but it is desirable that the tip of the spray nozzle 1 be positioned at least rearward than the inner surface of the tip of the recess 11 of the jet nozzle 8.

The present invention is constructed as described above, but by supplying relatively low pressure air of about 2 kg/cm ² from the pressurized air supply path 14, the air flow from the ventilation path 7 through the annular ventilation path 18 and the cavity 17 is achieved. The air is emitted from the orifice-type blowhole 11 while forming a fan-shaped air flow.

On the other hand, for example, two paints are supplied from the pressure liquid supply path 13.
Supply to objects with relatively high pressure of about 0 kg/cm ² ,
After the fan-shaped spray is brought into contact with the air flow from the orifice-type spray port 4 through the stepped hole 6, it is propelled to be enveloped while breaking through the air flow, and is applied to the object to be coated. . As a result, the spray pattern without the jet nozzle 8 has a tail as shown in FIG. 4A, whereas in the case of the present invention shown in FIGS. As shown in FIG. 4B, there is no tail at all, and the atomization is extremely good.

Note that the groove 3 of the spray nozzle 1 is not limited to the V-shape, but may be U-shape, U-shape,
or some other variant, but the blow nozzle 8
Although the grooves 10 are V-shaped as shown in FIG. 3 or FIGS. 5 to 8, it is preferable that they be U-shaped as shown in FIG. 9 in order to obtain good atomization. If the groove 10 is U-shaped as shown in FIG. 9, a spray pattern as shown in FIG. 4C can be obtained.
Further, if the shape is U-shaped, a spray pattern as shown in FIG. 4D can be obtained, but atomization at both ends tends to be insufficient.

Further, the concave cavity 9 of the jet nozzle 8 is not limited to a dome shape or a bowl shape as shown in FIG. 3, but may be semicylindrical as shown in FIGS. 10 and 11, and the effect is almost the same. It is.

As explained in detail above, the present invention is provided in front of the spray nozzle so that the concave cavity of the spray nozzle covers the spray nozzle, and the orifice-type spray port is positioned in front of the orifice-type spray port. , the airflow follows the inner surface of the concave cavity, low-pressure air can be used, the shape of the spray is not disturbed, and the advantage is that it can effectively prevent tail formation and promote atomization. , suitable for painting.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal cross-sectional view showing the liquid spraying device of the present invention, Fig. 2 is a left side view of Fig. 1, Fig. 3 is a cross-sectional view showing the main parts in Fig. 1, and Fig. 4 is a spray Figures 5 through 9 are cross-sectional views of main parts showing other embodiments of the jet nozzle, and Figures 1 and 9 are cross-sectional views showing other embodiments of the jet nozzle.
FIG. 0 is a vertical cross-sectional view of a main part showing still another aspect of the jet nozzle, and FIG. 11 is a cross-sectional view of FIG. 10. 1... Spray nozzle, 2... Concave, 3... Groove, 4
...Orifice type spout, 5...Holder, 8...
Fumarole nozzle, 9... recess, 10... groove, 11...
Orifice type blowhole.

Claims (1)

[Claims for Utility Model Registration] (1) A sprayer having a lip-shaped orifice-type spray opening 4 for spraying a relatively high-pressure liquid supplied through a pressure liquid supply path in a fan-shaped pattern. The relatively low pressure air supplied through the nozzle 1 and the pressure air supply path wraps the spray liquid from the spray nozzle into a fan shape to form a pattern, so that the intersection of the recesses 9 and the grooves 10 causes The spray nozzle 8 has a lip-shaped orifice-type blowhole 11 formed therein, and the spray nozzle 1 is provided in a state that it is covered with a concave cavity 9 of the blowhole 8, and the orifice-type blowhole 11 is formed with an orifice-type blowhole 11. A liquid spray device configured to be positioned in front of a liquid spray port 4. (2) The groove 10 of the jet nozzle 8 is V-shaped or U-shaped.
The liquid spraying device according to claim 1 of the utility model registration claim, which is in the shape of a letter. (3) The spray nozzle 1 is provided in a position where the tip of the orifice-type liquid spout 4 of the spray nozzle 1 is rearward of the inner surface of the tip of the concave hole 9 of the jet nozzle 8. 1st term or 2nd term
The liquid spray device described in section.