JPH0798167B2 - Distribution-controlled fan-shaped spray nozzle - Google Patents

Description

Description: FIELD OF THE INVENTION The present invention relates to a nozzle for obtaining a controlled, non-uniformly distributed fan spray.

[Conventional technology]

As a conventional nozzle for obtaining a fan-shaped spray having a controlled non-uniform distribution, there is, for example, the prior art described in Japanese Patent Application Laid-Open No. 50-70915.

In this prior art, as shown in FIGS. 1 to 3, the distribution characteristic curve of the spray is almost saw-toothed, and the maximum flow rate region is located at the center rather than the end. is doing.

Further, by modifying the ordinary fan-shaped spray nozzle having a lip-shaped nozzle formed by the intersection of the dome-shaped concave hole and the V-shaped groove, and modifying the shape of the nozzle, the shape of the nozzle is modified. There is a nozzle whose distribution characteristic curve of the spray is almost L-shaped, but both end edges thereof are also gradually inclined forward toward the center.

[Problems to be Solved by the Invention]

According to the above-mentioned prior art, this type of nozzle having an L-shaped distribution characteristic curve in which both side edges of the distribution characteristic curve of the spray are inclined and both side edges are parallel is used for coating the inner surface of a cup-shaped container. Was strongly desired.

Therefore, an object of the present invention is to provide a fan-shaped spray nozzle in which both side edges of a spray distribution characteristic curve are substantially parallel to each other, and to provide such a nozzle which is easy to manufacture.

[Means for Solving the Problems]

In order to achieve the above object, the present invention provides a first means,
A concave hole formed by a substantially dome-shaped concave surface having a relatively long straight line portion facing in parallel to the opening edge and a cylindrical flow path connected to the concave surface is provided in the nozzle main body in a rear open state, and the nozzle main body is also formed. At the front end of the above, a groove having a front open wide bottom is provided at a depth such that the groove bottom approaches the straight line portion at a right angle to the straight line portion, and the groove width of the front open groove is
The narrowest one side from the center between the straight parts,
The orifice width is gradually widened toward the straight portion, and the groove width on the side close to the narrowest portion is formed relatively narrow, thereby forming an orifice-type jet outlet having a substantially shamisen repellent front shape.

The second means adopts a substantially semi-cylindrical concave surface having a partial cylindrical surface instead of the substantially dome-shaped concave surface in the first means.

[Action]

According to the spray nozzle having the above structure, by spraying the paint under the airless condition, the distribution characteristic curve of the spray becomes the sixth.
As shown in the figure, it is possible to obtain a coating film having a paint distribution characteristic in which both end edges are almost parallel to each other, so that not only can a desired thickness be applied to a required area, but also other areas. It is possible to reliably prevent unnecessary scattering in the outer portion.

〔Example〕

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

The embodiment shown in FIG. 7 to FIG. 10 has a substantially dome-shaped concave surface 3 of an oval-shaped opening edge having relatively long straight line portions 2, 2 facing each other in parallel in the portion near the tip of the nozzle main body 1, and this concave surface. A concave hole 5 made up of a tubular flow path 4 having an oval cross section continuously provided to the nozzle main body 1 is provided at the front end of the nozzle main body 1.
A groove 6 having a bottom with a front open state is provided at a depth at which the groove bottom approaches the linear portions 2 and 2 at a right angle to the linear portions 2 and 2, and the groove width of the groove 6 is In addition to forming the narrowest portion on one side from the center between the straight portions 2 and 2, the groove width of the end portion on the side close to the narrowest portion is formed narrower than the groove width on the other side,
As a result, an orifice-type ejection port 7 having a repellent front shape for the shamisen is formed, and the concave surface 3 and the flow path 4 are formed.
It should be noted that the linear portions 2 and 2 in the connecting portion with and are formed with corners as shown in detail in Fig. 10, and the bottom of the groove 6 is slightly close to the corners. It is important to be positioned in the front, and the relationship between the corners and the depth of the groove 6 suppresses the generation of tails at both end portions of the fan-shaped spray, and at the same time prevents the scattering of the tail spray, thereby providing a vertical characteristic at both end portions. It is possible to obtain the coating distribution characteristic that is possessed, and by forming the length of the linear portion 2 sufficiently longer than the groove bottom width, the allowable range of the centering error when forming the groove 6 is increased, which is advantageous in manufacturing. Is.

In forming the recessed hole 5, it may be formed by electric discharge machining, or as shown in FIGS. 11 and 12, the both ends of the cylindrical body A having a dome-shaped tip are cut in parallel or slightly tapered. To form the flat wall portions B and B, and at the same time, the inclined surfaces C and C that gradually approach the front of the flat wall portions B and B toward the front are cut, and the boundary between the flat wall portions B and the inclined surface C is cut. A core E having an obtuse-angled ridge portion D may be used to mold a cemented carbide or ceramic by powder molding, sinter it, and thereafter form the groove 6 by electric discharge machining or shaving. .

As shown in FIGS. 13 and 14, the bottom of the groove 6 is provided with a plurality of uneven strips 8 having a V-shaped cross section in order to prevent the tail from occurring.

Regarding the shape of the concave hole 5, the concave surface 3 is formed in a substantially semicylindrical shape with a partial cylindrical surface as shown in FIGS. 15 and 16, and the straight line 2, 2 parallel to the axis of the partial cylindrical surface is formed. The corner portions may be formed, and other portions are the same in nature as those in the embodiment of FIGS. 13 and 14, and the same portions are designated by the same reference numerals and the description thereof will be omitted. To do.

〔effect〕

As described above, according to the present invention, a concave hole having a concave surface, a flow path, and a linear corner portion is provided, and a groove having a narrow bottom is provided with a depth at which the groove bottom approaches the corner portion. In addition, since the groove width is gradually widened to the corners with the portion closer to one side than the center as the narrowest portion, the orifice shape ejection port whose front shape is almost repellent is formed. A fan-shaped spray with a minimum flow rate in the middle part and a substantially L-shaped distribution characteristic that gradually increases to the other side end can be ejected, and both ends are stunning and a tail-shaped spray is prevented. There is an effect that the spray can be easily obtained.

[Brief description of drawings]

In the drawings, FIG. 1 to FIG. 5 are diagrams each showing a distribution characteristic curve of a spray obtained by a conventional distribution control type fan-shaped spray nozzle, and FIG. 6 is a distribution characteristic line of a spray obtained by the nozzle of the present invention. FIGS. 7 to 10 show a nozzle according to the present invention in one embodiment.
The figure is a vertical side view, FIG. 8 is a front view, FIG. 9 is a cross-sectional plan view, FIG. 10 is a vertical side view of essential parts, and FIGS. 11 and 12 are the cores for molding a concave hole, respectively. FIG. 13 is a front view of another embodiment, FIG. 14 is a cross-sectional plan view taken along line IX-IX in FIG. 13, and FIGS.
The drawings are a vertical sectional side view and a cross-sectional plan view, respectively, in yet another embodiment. 1 …… Nozzle main body 2 …… Straight line part 3 …… Concave surface 4 …… Cylindrical flow path 5 …… Concave hole 6 …… Groove 7 …… Spout port

Claims (2)

[Claims] 1. A nozzle having a concave hole formed by a substantially dome-shaped concave surface having straight portions facing each other in parallel and a cylindrical flow path connected to the concave surface so that corner portions are formed in the straight portion. In addition to being provided in the rear open state on the main body, the front end of the nozzle main body is provided with a groove having a wide bottom in the front open state at a depth at which the groove bottom approaches the straight line portion at a right angle relationship with the straight line portion,
And the groove width of the groove is the narrowest from the center between the linear portions toward one side, and gradually formed wider toward the linear portion, and the groove width on the side closer to the narrowest portion is formed narrower than the other side, A distribution-control-type fan-shaped spray nozzle formed by forming an orifice-type jet having a substantially repellent front shape. 2. A nozzle main body having a concave hole formed by a substantially semi-cylindrical concave surface having a partial cylindrical surface and a cylindrical flow passage continuously provided so as to form a corner portion parallel to the axis of the partial cylindrical surface. And the front end of the nozzle main body is provided with a groove having a wide bottom in the front open state at a depth at which the groove bottom approaches the corner portion at a right angle to the corner portion. The groove width of the groove is narrowest toward one side from the center between the two corners and gradually widens toward the corner, and the groove width near the narrowest side is narrower than the other side. A distribution-control-type fan-shaped spray nozzle formed by forming an orifice-shaped jet having a substantially repellent front shape.