JPH0798165B2 - Distribution-controlled fan-shaped spray nozzle - Google Patents

Description

TECHNICAL FIELD The present invention relates to a nozzle for obtaining a fan-shaped spray having a controlled non-uniform distribution, and more particularly to a nozzle suitable for airless spraying of high viscosity paint.

[Conventional technology]

As a conventional nozzle for obtaining a fan-shaped spray having a controlled non-uniform distribution, there is a so-called drum head nozzle as described in, for example, JP-A-50-70915. The shape is boat-shaped, and the inner surface of the orifice is formed in an irregular shape so that a fan-shaped spray having a sawtooth distribution characteristic curve can be obtained.

[Problems to be Solved by the Invention]

According to the above-mentioned prior art, the purpose is a nozzle for obtaining a fan-shaped spray having a sawtooth distribution characteristic curve, and therefore, according to the configuration, a fan-shaped spray having another special distribution characteristic curve cannot be obtained. By the way, it is almost L, which is different from the simple sawtooth characteristic.
A nozzle that can obtain a fan-shaped spray having a character-shaped distribution characteristic curve (hereinafter referred to as an L-shaped characteristic) is desired.

Therefore, an object of the present invention is to provide a nozzle for an airless spray that can obtain a fan-shaped spray having an almost L-shaped characteristic with a simple structure, and another object is a nozzle whose distribution characteristic can be adjusted. To provide.

[Means for Solving the Problems]

In order to achieve the above object, the present invention provides a nozzle main body with a recessed hole having a dome-shaped concave surface at the front end in an open state at the rear, and at the front end of the nozzle main body in the front in a direction corresponding to the diameter of the dome-shaped concave surface. A relatively deep vertical groove that is open and a relatively shallow lateral groove that is orthogonal to the vertical groove under the condition that the diameter is different from the diameter of the dome-shaped concave surface are provided so as to intersect with the concave surface. Forming a mold nozzle,
Further, instead of the lateral groove, a notch is provided in a facing state at the lip-shaped edge portion to form a substantially cross-shaped orifice type nozzle, and the vertical groove is formed so that the groove width on one side gradually increases. May be.

[Action]

According to the above configuration, in contrast to the fan-shaped spray having a substantially uniform distribution ejected from the rip-shaped injection port formed by the intersection of the concave surface and the vertical groove, the flow amount to one end is controlled by controlling the outflow distribution by the lateral groove or the notch. Distribute the distribution so that L
It is possible to obtain a fan-shaped spray having a character characteristic.

As a method of measuring the characteristics, the spray of a corrugated paper is sprayed for a certain period of time on a corrugated paper surface having a large number of uneven lines parallel to the minor axis direction of the substantially oval coating pattern obtained by applying the fan-shaped spray from the vertical direction. A curve drawn by the length of the liquid flowing down in the groove may be obtained.

〔Example〕

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

Referring to the embodiment shown in FIGS. 1 to 3, a nozzle main body 1 made of a hard material such as cemented carbide is provided with a concave hole 4 formed of a dome-shaped concave surface 2 and a tapered cylindrical passage 3 in an open rearward state. In addition, a vertical groove 5 having a V-shaped cross section is provided at the front end of the nozzle main body 1 so that its groove bottom is close to the passage 3 or in the passage 3 under the condition that the vertical groove 5 is aligned in the diametrical direction of the dome-shaped concave surface 2. In addition to being provided relatively deep so as to slightly intersect, the lateral groove 6 orthogonal to the vertical groove 5 is relatively shallowly intersected with the dome-shaped concave surface 2 under the condition that the dome-shaped concave surface 2 deviates from the diametrical direction. By providing them, an almost cross-shaped orifice type nozzle hole 7 is formed, so that a spray having an L-shaped characteristic curve as shown in FIG. 4 can be obtained.

The embodiment shown in FIGS. 5 to 7 is not provided with the lateral groove in the above-mentioned embodiment, but instead is provided with the rim of the lip-shaped injection port which is formed by the intersection of the dome-shaped concave surface 2 and the vertical groove 5. A pair of notches 8 and 8 facing each other are formed by lapping or electric discharge machining, and L as shown in FIG.
Characteristic sprays can be obtained.

Regarding the shapes of the vertical groove 5 and the horizontal groove 6, a V-shape as shown in FIG. 8 (A), a U-shape as shown in (B), an inverted trapezoid as shown in (C), a square as shown in (D), etc. , Various shapes can be selected, and the L-shaped characteristic can be adjusted based on the combination of the expansion angle, width, depth, radius of curvature of the dome-shaped concave surface 2, and the like. The shape of the cutout portion 8 is not limited to the circular arc shape, but may be any of the shapes shown in FIGS.
The distribution characteristics can be adjusted by various shapes and sizes as in (C) and (D).

The vertical groove 5 may be formed so that the groove width on one side is gradually increased as shown in FIG. 9, which is effective in adjusting the distribution characteristics.

In addition, in the above-described embodiments, it is desirable to attach a pre-orifice 9 in the range of 1/2 to 2 times the flow area of the injection port 7 near the passage 3 of the main body 1 and upstream thereof, thereby preventing the occurrence of tail. It has the effects of improving atomization, adjusting the distribution characteristics, and the like, and particularly by appropriately selecting the distribution area of the pre-orifice 9 to be substantially the same as the distribution area of the injection port 7, good results can be obtained.

〔The invention's effect〕

As described above, according to the present invention, the ridge-shaped nozzle formed by the intersection of the dome-shaped concave surface and the vertical groove is further provided with the lateral grooves or notches in the uneven distribution state to form a substantially cross-shaped nozzle. Based on a simple structure, there is an effect that the distribution of the spray can be controlled and the fan-shaped spray with L-shaped characteristics can be easily and surely injected, and a pre-orifice should be attached upstream near the nozzle nozzle. This has the advantage that the effects of preventing tail generation, atomization, and distribution control can be improved. When spraying the inner surface of a circular container that has a collar at the opening while applying spray coating, or to the ridges. Suitable for spray painting.

[Brief description of drawings]

In the drawings, FIGS. 1 to 3 show claims 1 and 3.
Which shows a nozzle of an embodiment corresponding to
The drawing is a vertical side view, FIG. 2 is a vertical front view, FIG. 3 is a plan view mainly of a nozzle, FIG. 4 is a view showing a distribution characteristic curve of spray by the nozzle of the present invention, and FIGS. An embodiment corresponding to items 2 and 3, wherein FIG. 5 is a longitudinal side view,
FIG. 6 is a vertical sectional front view, FIG. 7 is a plan view of the nozzle main body, and FIG. 8 is a schematic view showing another example of the shape of the vertical groove, the horizontal groove, and the cutout portion,
FIG. 9 is a front view showing another embodiment of the vertical groove. 1 …… Nozzle main body 2 …… Dome shape concave surface 3 …… Passage 4 …… Concave hole 5 …… Vertical groove 6 …… Horizontal groove 7 …… Injection port 8 …… Notch 9 …… Pre-orifice

Claims (3)

[Claims] 1. A nozzle main body is provided with a recessed hole consisting of a dome-shaped concave surface and a passage in a rear open state, and a vertical groove is formed at the front end of the nozzle main body so as to coincide with the diametrical direction of the dome-shaped concave surface. In addition, the groove bottom is provided relatively deep so that it is close to or slightly intersects with the passage, and one lateral groove orthogonal to the vertical groove is provided under the condition that it is deviated from the diametrical direction of the dome-shaped concave surface. A distribution control type fan-shaped spray nozzle, characterized in that it is provided on a dome-shaped concave surface so as to intersect relatively shallowly, and an approximately cross-shaped orifice type nozzle is formed. 2. A nozzle main body is provided with a concave hole consisting of a dome-shaped concave surface and a passage in an open rearward state, and a vertical groove is formed at the front end of the nozzle main body so as to coincide with the diametrical direction of the dome-shaped concave surface. In addition, the groove bottom is provided relatively deeply so as to be close to or slightly intersects with the passage to form a lip-shaped jet port, and a pair of notched portions facing each other at the edge of the lip-shaped jet port near one end. The distribution control type fan-shaped spray nozzle is characterized by forming an almost cross-shaped orifice type nozzle. 3. The distribution area of the injection port is upstream, near the recessed hole.
3. The distribution control type fan-shaped spray nozzle according to claim 1, further comprising a pre-orifice having a flow area of 1/2 to 2 times.