JPH0235954A - Fan-shaped spray nozzle of distribution control type form - Google Patents

Abstract

PURPOSE:To obtain an R- or W-shaped characteristic, fanwise direction of a stream from a nozzle by providing two additional horizontal grooves to a lip-shaped orifice formed by the intersection of a dome-shaped recessed surface and a vertical groove so as to form a nearly patriarchal cross-shaped orifice. CONSTITUTION:A main nozzle body 1 is provided with a hole 4 consisting of a dome-shaped recess surface 2 and a passage 3 widening toward the rear end thereof. A relatively deep vertical groove 5 is provided on the front end of the main nozzle body 1 diametrically of the dome-shaped surface 2 at such a depth that its bottom surface lies near or slightly intersecting the passage 3, while two relatively shallow grooves 6a and 6b are provided oppositely on each side of the diameter of the dome-shaped recess surface 2 and intersecting perpendicularly to the vertical groove 5 at such a depth that their bottom surfaces lie slightly intersecting the dome-shaped recess surface 2, thereby forming a nearly patriarchal cross-shaped orifice type tip 7. Such groove configuration permits an easy and accurate R- or W-shape characteristic, fanwise direction of a stream from a nozzle.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a nozzle for obtaining a fan-shaped spray with a controlled non-uniform distribution, and in particular to a nozzle suitable for airless spraying of high viscosity paints.

[Conventional technology]

As a conventional nozzle for obtaining fan-shaped spray with controlled non-uniform distribution, there is a so-called drum head nozzle as described in, for example, Japanese Patent Application Laid-open No. 70915/1983. The shape is boat-shaped, and the inner surface of the orifice is shaped differently, so that a fan-shaped spray with a sawtooth distribution characteristic curve can be obtained.

[Problem to be solved by the invention]

In the above-mentioned prior art, the purpose is a nozzle to obtain a fan-shaped spray with a sawtooth distribution characteristic curve, and therefore, depending on its configuration, it is not possible to obtain a fan-shaped spray with another special distribution characteristic curve. Modified sawtooth characteristics that are different from sawtooth characteristics, such as an almost horizontally R-shaped distribution characteristic curve in which the lower part of the sawtooth shape is increased in a U-shape (hereinafter referred to as R-shaped characteristic), or an approximately W-shaped distribution characteristic curve. A nozzle that can obtain a fan-shaped spray with a curve (hereinafter referred to as W-characteristic) is desired.

Therefore, an object of the present invention is to provide R
Another object of the present invention is to provide a nozzle for airless spraying that can produce a fan-shaped spray with a W-shaped or W-shaped characteristic, and another object of the present invention is to provide a nozzle whose distribution characteristics can be adjusted. In order to achieve the above object, the present invention provides a concave hole having a dome-shaped concave surface at the front end in a nozzle main body in a rearward open state, and a concave hole having a dome-shaped concave surface at the front end of the nozzle main body. A relatively deep vertical groove in a front open state in a direction corresponding to the diameter of the dome-shaped concave surface, and two relatively shallow horizontal grooves perpendicular to the vertical groove in a state deviating from the diameter of the dome-shaped concave surface are formed in the concave surface. By intersecting the grooves, an orifice-type nozzle with a substantially square shape is formed, and instead of the two horizontal grooves, there are four grooves on the rim of the nozzle.
It is formed by providing cut-outs at certain locations to form an orifice-type nozzle having a substantially square shape.

[For production]

According to the above configuration, the fan-shaped spray with an almost uniform distribution is ejected from the basic lip-shaped nozzle formed by the intersection of the concave surface and the vertical groove, and the outflow distribution is controlled by the horizontal groove or the notch, resulting in an R-shaped or This makes it possible to obtain a spray with W-shaped characteristics.

The above-mentioned characteristics were measured by spraying the spray for a certain period of time onto a corrugated paper surface having a large number of uneven stripes parallel to the short axis direction of an approximately oval coating pattern obtained by applying fan-shaped spray from the vertical direction. All you have to do is find the curve drawn by the length of the liquid flowing down inside the groove.

〔Example〕

Hereinafter, the nozzle of the present invention will be described in detail with reference to the illustrated embodiments.

1 to 3, a concave hole 4 consisting of a dome-shaped concave surface 2 and a cylindrical passage 3 is formed in the nozzle main body 1 made of a hard material such as cemented carbide. In addition to being provided in an open state, the front end of the nozzle main body 1 has a cross section V.
In addition to providing a character-shaped vertical groove 5 so deep that it coincides with the diameter direction of the dome-shaped concave surface 2 and having a groove bottom that is close to or slightly intersects with the passage 3, the dome-shaped concave surface 2 is Two horizontal grooves 6a and 6b orthogonal to the vertical groove 5 are provided so as to intersect relatively shallowly in the dome-shaped concave surface 2 in a state in which they are deviated from each other in the diametrical direction, thereby forming an approximately K-shaped orifice shape. A blower lower is formed, and the horizontal groove 6a
, 6b are formed to have different depths, a spray having an R-shaped characteristic as shown in FIG. 4 can be obtained, and both lateral grooves 6a,
If 6b is formed in the same manner, a spray having a W-shaped characteristic as shown in FIG. 5 can be obtained.

In the embodiments shown in FIGS. 6 to 8, the horizontal grooves in the previous embodiments are not provided, and instead, the mouth edges near both ends of the lip-shaped nozzle are formed by the intersection of the dome-shaped concave surface 2 and the vertical grooves 5. Two pairs of arcuate notches 8a l facing each other
By forming g', a and 8b, 8b by lapping or electric discharge machining, a spray having characteristics as shown in FIG. 4 or 5 can be obtained.

Said longitudinal groove5. The shapes of the lateral grooves 6a and 6b are V-shaped as shown in FIG. 9(4), and U-shaped as shown in FIG. 9(B).

Various shapes can be selected, such as an inverted trapezoid like (C) and a rectangle like (D), and the expansion angle is 1 width.

The R-shaped characteristic and W-shaped characteristic can be adjusted based on the combination of the depth and the radius of curvature of the dome-shaped concave surface 2, and similarly, the shape of the notches 8a and 8b is not limited to the arc shape. , Figure 9 (4), (B), (C
) and (D), various shapes can be selected, and the distribution characteristics can be adjusted depending on the shape and size.

Further, in the embodiments described above, the nozzle main body 10 passage 3
It is desirable to install a pre-orifice 9 in the range of y6 to 2 times the flow area of the injection lower near and upstream of the spray nozzle. In particular, by appropriately selecting the flow area of the pre-orifice 9 to the same extent as the flow area of the spray lower, it is possible to obtain a spray with typical Rf characteristics.

〔Effect of the invention〕

As explained above, according to the present invention, the lip-shaped nozzle formed by the intersection of the dome-shaped concave surface and the vertical groove is further provided with two lateral grooves or two pairs of notches, so that the lip-shaped nozzle is almost completely closed. Based on an extremely simple configuration that forms a letter-shaped spout,
It has the effect of controlling the spray distribution to easily and reliably inject a fan-shaped spray with R-shaped or W-shaped characteristics, and by attaching a pre-orifice upstream near the nozzle outlet, it is possible to prevent tail generation by 9M. It has the advantage of improving each effect of distribution control, and is suitable for painting the inner surface of a stepped cylindrical container or the like while rotating it.

[Brief explanation of the drawing]

In the drawings, FIGS. 1 to 3 represent claims 1 and 3.
1 shows a nozzle of an embodiment corresponding to the first embodiment.
The figure is a longitudinal side view, Fig. 2 is a longitudinal front view, Fig. 3 is a plan view of the main body of the nozzle, Figs. 4 and 5 are views showing the spray distribution characteristic curves by the nozzle of the present invention, and Fig. 6 8 to 8 show embodiments corresponding to claims 2 and 3, in which FIG. 6 is a vertical side view, FIG. 7 is a vertical front view, FIG. 8 is a plan view of the main body of the nozzle, and FIG. It is a schematic diagram showing other examples of the shapes of vertical grooves, horizontal grooves, and notches. 1 Fist e 3 @ 4 Fist 5 ・ 6a ・ 6b ・ 7 @ 8a ・ 8b ・ 9 ・ ・Nozzle main body・Dome-shaped concave surface・Passage・Concave hole・Vertical groove・Horizontal groove・Horizontal groove・Spout・Notch・Notch part Orifice Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] 1. A recessed hole consisting of a dome-shaped concave surface and a passage is provided in the nozzle main body in a rearward open state, and a vertical groove is formed in the front end of the nozzle main body so as to correspond to the diameter direction of the dome-shaped concave surface. In addition to providing grooves relatively deep so that the groove bottoms are close to or slightly intersect with the passage, two grooves are provided that are perpendicular to the vertical groove and are deviated from each other in the diametrical direction of the dome-shaped concave surface. A distribution control fan-shaped spray nozzle characterized in that a lateral groove is provided so as to relatively shallowly intersect with the dome-shaped concave surface to form a substantially square-shaped orifice-type nozzle. 2. A recessed hole consisting of a dome-shaped concave surface and a passage is provided in the nozzle main body in a rearward open state, and a vertical groove is provided in the front end of the nozzle main body so as to coincide with the diameter direction of the dome-shaped concave surface, In addition to forming a lip-shaped nozzle by having the groove bottom relatively deep so as to be close to or slightly intersect with the passage, two grooves are formed on the edges of the lip-shaped nozzle near both ends.
A distribution control fan-shaped spray nozzle characterized in that a pair of notches are provided to form an approximately square-shaped orifice-shaped nozzle. 3. Upstream near the concave hole, 1/2 to 1/2 of the flow area of the nozzle.
3. The distribution-controlled fan-shaped spray nozzle according to claim 1, further comprising a pre-orifice having twice the flow area.