JPH02152567A - Distribution control type sectorial spraying nozzle - Google Patents

Abstract

PURPOSE:To eject sectorial sprays having L-shaped distribution characteristics by providing a hollow hole having linear corner parts, providing a groove having a broad bottom at the depth approximate to the above-mentioned corner parts, forming this groove to a specific width, and forming a plactrum-shaped orifice type ejection port. CONSTITUTION:A hollow hole 5 consisting of a dome-shaped recessed face 3 having straight parts 2, 2 near the tip of a nozzle body 1 and a cylindrical flow passage 4 provided successively thereto is provided in the state of opening the rear side thereof. The groove 6 having the broad bottom in the state of opening the front in the rectangular relation with the straight parts 2, 2 is provided at the front end of the nozzle body 1 at the depth approximate to the straight parts 2, 2. This groove 6 is formed to the width smallest near the one side from the center between the above-mentioned two straight parts 2, 2. The groove width on the side near the narrowest part is formed narrower than the groove width on the other side. The orifice type ejection port 7 having the shamisen plectrum-shaped front surface shape is formed in this way. The distribution characteristic curve of the sprays thereof has the L shape which is parallel in the end edges on both sides.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a nozzle for obtaining a fan-shaped spray with controlled non-uniform distribution.

[Conventional technology]

As a conventional nozzle for obtaining a fan-shaped spray with a controlled non-uniform distribution, there is a prior art described in, for example, Japanese Patent Laid-Open No. 70915/1983.

In this prior art, the spray distribution characteristic curves are almost sawtooth-shaped, as illustrated in FIGS. are doing.

In addition, by improving the ordinary fan-shaped spray nozzle that has a lip-shaped nozzle formed by the intersection of a dome-shaped recessed hole and a 7-shaped groove, and by changing the shape of the nozzle, as shown in Figures 4 and 5. There is a nozzle with a spray distribution characteristic curve that is almost L-shaped, but both edges of the nozzle are also inclined toward the center gradually toward the front.

[Problem to be solved by the invention]

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

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a fan-shaped spray nozzle in which the spray distribution characteristic curve has an L-shape in which both edges are substantially parallel, and also to provide this kind of nozzle that is easy to manufacture.

[Means to solve the problem]

In order to achieve the above object, the present invention provides, as a first means, a substantially dome-shaped concave surface having a relatively long straight section facing parallel to the opening edge, and a cylindrical flow path connected to the concave surface. A recessed hole is provided in the nozzle main body in a rearward open state, and at the front end of the nozzle main body, a groove with a wide bottom is opened in the front and is perpendicular to the straight line part, and the groove bottom approaches the straight line part. The groove width of the front open groove is provided at a depth of approximately
It is narrowest on one side from the center between the two straight parts,
The groove width is gradually widened toward the straight portion, and the width of the groove on the side closest to the narrowest portion is relatively narrow, thereby forming an orifice-type spout having an almost shamisen-shaped front shape.

In addition, the second means adopts a substantially semicylindrical concave surface having a partial cylindrical surface in place of the substantially dome-shaped concave surface in the first means.

[For production]

According to the spray nozzle having the above configuration, by spraying the paint in an airless manner, the distribution characteristic curve of the spray becomes 6th.
It is possible to obtain a coating film with paint distribution characteristics that exhibits an L-shape with almost parallel edges on both sides as shown in the figure. Therefore, it is possible not only to apply the coating to the required area to the desired thickness, but also to apply it to other areas. Unnecessary scattering can be reliably prevented on the outer part of the container.

〔Example〕

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

In the embodiment shown in FIGS. 7 to 10, a relatively long straight portion 2.2 is provided near the tip of the nozzle main body 1 and parallel to each other.
A recessed hole 5 consisting of a substantially dome-shaped concave surface 3 with an oval-shaped opening edge, and a cylindrical channel 4 with an oval-shaped cross section connected to this concave surface.
is provided in the rear open state, and at the front end of the nozzle main body 1, a groove 6 with a wide bottom is provided in the front open state in a perpendicular relationship to the straight line part 2.2. The groove width of the groove 6 is set to a depth approaching that of the two-way line portion 2.
．． In addition to forming the narrowest part on one side from the center between the two, the groove width at the end closest to the narrowest part is narrower than the groove width on the other side. It forms an orifice-type ejection lower having a shape, and the straight portion 2°2 of the connecting portion between the concave surface 3 and the flow path 4 is the first
It should be noted that the corner part is formed as shown in detail in Figure 0, and it is important that the bottom of the groove 6 is located close to the corner part and slightly forward. The relationship between the corner portion and the depth of the groove 6 suppresses the generation of tails at both ends of the fan-shaped spray, and at the same time prevents scattering, making it possible to obtain coating distribution characteristics with vertical characteristics at both ends, while also preventing tails from forming at both ends of the fan-shaped spray. By forming the length of the groove 2 to be sufficiently longer than the width of the groove bottom, the allowable range of centering errors when forming the groove 6 increases, which is advantageous in manufacturing.

The recessed hole 5 may be formed by electric discharge machining, or by cutting parallel or slightly tapered both sides of the cylindrical body A having a dome-shaped tip as shown in FIGS. 11 and 12. and flat wall part B.

At the same time as forming the flat wall portion B, an inclined surface C9C gradually approaching the front end of the flat wall portion B and B is cut, and these flat wall portions B
After molding cemented carbide or ceramic by powder molding using a core E having an obtuse edge at the boundary between the curved surface and the inclined surface C, it is sintered, and then the groove 6 is machined. Alternatively, it may be formed by cutting.

Regarding the bottom of the groove 6, as shown in FIGS. 13 and 14, it is effective to provide several uneven stripes 8 having a V-shaped cross section in order to prevent the occurrence of a tail.

Regarding the shape of the recessed hole 5, as shown in FIGS. 15 and 16, the concave surface 3 is formed into a substantially semicylindrical shape with a partially cylindrical surface, and a straight portion 2.2 parallel to the axis of the partially cylindrical surface.
The other parts are similar in nature to the embodiments shown in FIGS. 13 and 14, and the same parts are given the same reference numerals and will not be described. Omitted.

〔effect〕

As explained above, according to the present invention, a recessed hole having a concave surface, a flow path, and a rectilinear corner is provided, and the groove bottom of the groove has a wide bottom and approaches the corner. The width of the groove is narrowest at the part closer to one side than the center, and gradually widened toward the corner to form an orifice-type spout with an almost pliable front shape. It is possible to eject a fan-shaped spray having an approximately L-shaped distribution characteristic in which the flow rate is minimum in the middle part of the tube and gradually increases toward the other end, and in addition, both ends are heated and the generation of tails is prevented. This has the effect of making it easy to obtain a fan-shaped spray.

[Brief explanation of the drawing]

In the drawings, FIGS. 1 to 5 are graphs showing the spray distribution characteristic curves obtained by the conventional distribution control fan-shaped spray nozzle, respectively, and FIG. 6 is the spray distribution characteristic curve obtained by the nozzle of the present invention. 7 to 10 show a nozzle of the present invention in one embodiment, in which FIG. 7 is a vertical side view, FIG. 8 is a front view, FIG. 9 is a cross-sectional plan view, and FIG. The figures are longitudinal sectional side views of the main parts, Figures 11 and 1.
Figure 2 is a slope view and side view showing the main parts of a molding core with a recessed hole, Figure 13 is a front view of another embodiment, and Figure 14 is a cross-sectional plane taken along the line ■-■ in Figure 13. Figure, also the first
5 and 16 are a vertical side view and a cross-sectional plan view of the plate and other embodiments. ■・・・Nozzle main body 2・・Straight section 3@・Concave surface 4・・Cylindrical flow path 5・・Concave hole 6・・Groove 7・・Spout outlet

Claims (1)

[Claims] 1. A concavity formed by a substantially dome-shaped concave surface with straight portions facing each other in parallel and a cylindrical flow path connected to the concave surface so that corner portions are formed at the straight portions. A hole is provided in the nozzle main body in a rear open state, and at the front end of the nozzle main body, a groove with a wide bottom is provided in a front open state in a perpendicular relationship to the straight line part, and the depth is such that the groove bottom approaches the straight line part. and the groove width of the groove is narrowest on one side from the center between the two straight portions, and gradually becomes wider toward the straight portion, and the groove width on the side closest to the narrowest portion is narrower than on the other side. A distribution control type fan-shaped spray nozzle formed with an orifice-type spout having a substantially repellent front shape. 2. A concave hole formed by a substantially semi-cylindrical concave surface with a partially cylindrical surface and a cylindrical flow path connected so as to form a corner parallel to the axis of the partially cylindrical surface is opened to the rear of the nozzle main body. In addition, at the front end of the nozzle main body, a groove with a wide bottom that is open at the front is provided in a perpendicular relationship to the corner, and the groove bottom approaches the corner, and The width of the groove is narrowest on one side from the center between the two corner portions, and gradually becomes wider toward the corner portion, and the groove width on the side closest to the narrowest portion is narrower than on the other side, A distribution control type fan-shaped spray nozzle formed with an orifice-type spout having a substantially repellent front shape.