JPH0127881Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a flat blow nozzle capable of ejecting high viscosity liquid in a uniformly distributed, wide-angle fan shape.

Orifice-type hydraulic nozzles, which have a lip-shaped nozzle formed by intersecting a dome-shaped recessed hole and a V-shaped groove, are commonly used as fan-shaped spray nozzles. It is not suitable for ejecting high-viscosity liquids such as paint in a wide-angle fan shape, and there has been a demand for a flat blow nozzle that can eject high-viscosity liquids in a wide-angle fan shape with uniform distribution.

In order to immediately meet the above-mentioned demands, the present invention provides an orifice-type nozzle with a substantially saddle-shaped nozzle formed by intersecting groove bottoms facing each other at right angles.
To obtain a hydraulic jetting nozzle that uniformly distributes high viscosity liquid, has a wide-angle fan shape, and has a small discharge amount by forming an internal groove in a substantially V-shape with a medium depth that gradually becomes deeper, especially in the center where the nozzle is formed. The present invention is characterized by being able to do the following, and the embodiments illustrated in the accompanying drawings will be described in detail below.

As a flat blowing device to which the present invention is applied, for example, as shown in FIG. 1, a valve seat 2 is fitted to the tip of a gun body 1, and a valve body 3 corresponding to this valve seat 2 can be moved forward and backward. In addition, the orifice type hydraulic jet nozzle 4 is fixed to the holder 5, and the holder 5 is attached to the tip of the gun body 1 with a nut 7 with a packing 6 interposed, and the nozzle 4, almost a saddle is formed by relatively shallowly intersecting an internal groove 8 having a V-shaped cross section and a trapezoidal external groove 9 carved in the front end face while opposing each other at right angles in a portion near the front end of the nozzle body. A type with a shaped spout 10 will be adopted.

The injection liquid from the saddle-shaped nozzle 10 due to the intersection of the inner and outer grooves 8 and 9 has a characteristic that a significantly wide-angle fan-shaped pattern can be obtained, but the inner groove 8 is a V-shaped groove with a uniform depth. However, as shown in Figure 6, there is a drawback that the distribution is uneven, thick at both ends and thin at the center.
Therefore, in the present invention, as shown in detail in FIGS. 2 to 5, for example, the internal groove 8 is formed to be deep in the middle so that it gradually becomes deeper from both ends of the groove toward the center. The inner groove 8 intersects the outer groove 9 at the deepest part of the front end of the center, and when forming the inner groove 8, for example, an axe-shaped recessed hole 11 is opened in the rear of the nozzle body. It is best to use the blade part near the tip as the internal groove 8. Although this tends to make the injection angle slightly smaller, it is possible to obtain a fan-shaped pattern with a uniform distribution as shown in Figure 7. It is.

As for the cross-sectional shape of the internal groove 8, it is desirable that the groove bottom is rounded, but it may also be a trapezoid with a narrow bottom width.In short, it is sufficient that both side wall surfaces of the internal groove 8 are inclined. The shape of 10 may be a V-shape, a U-shape, or a U-shape as a result of implementation, but a trapezoid is preferable.

In addition to the above, as shown in FIG. 1, by providing a pre-orifice 12 with a circular hole upstream close to the nozzle 4 in a coaxial relationship with the nozzle 4 while being fitted into the holder 5, the coating film thickness can be increased. It is desirable to further improve the uniformity of spraying so that a uniform coating film can be obtained regardless of the distance of spraying.

The nozzle 4 and the pre-orifice 12 are preferably made of a super hard material such as ceramics or cemented carbide.
Regarding the flow area of No. 2, it is effective over a wide range for the spout 10 of the nozzle 4.

As explained above, according to the present invention, approximately V
By forming an internal groove with a letter-shaped cross section gradually deeper in the center and intersecting the external groove at the deepest point in a perpendicular relationship with the internal groove to form a nearly saddle-shaped nozzle, it is possible to It has the effect of being able to inject high viscosity liquid in a wide-angle fan-shaped pattern with uniform distribution even at relatively low pressure.
Because the shape of the nozzle is different from the narrow slit,
Workability is high because there is no nozzle clogging, and the nozzle itself can be made stronger by forming the internal groove with an axe-shaped recessed hole instead of penetrating the outer peripheral surface of the nozzle body.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional side view showing the main parts of an injection gun equipped with the flat spray nozzle of the present invention in one embodiment, and FIGS. Figure 4 is a cross-sectional plan view taken along the line - in Figure 2;
The figure is an explanatory perspective view of a concave hole and a saddle-shaped nozzle in a jet nozzle, and FIGS. 6 and 7 are cross-sectional views of the coating film of an inappropriate fan-shaped pattern and a suitable fan-shaped pattern, respectively. 4... Nozzle, 8... Internal groove, 9... External groove,
10...Fountain.

Claims (1)

[Scope of utility model registration request] An orifice-type liquid jet nozzle 4 in which an approximately saddle-shaped nozzle 10 is formed by intersecting an internal groove 8 and an external groove 9, each having a substantially V-shaped cross section with both sides inclined, in a perpendicular relationship and facing each other, A high viscosity liquid characterized in that the internal groove 8 is formed to become gradually deeper from both ends of the groove toward the center, and intersects with the external groove 9 at the deepest central part of the internal groove 8. A flat blow nozzle suitable for wide-angle spraying.