JPS63134073A - Nozzle for sectorial spraying - Google Patents

Abstract

PURPOSE:To improve wear resistance by forming a lip-shaped nozzle by crossing of a recessed surface and a V-groove and providing a straight part parallel with an axial line over the entire region at the mouth edge of the nozzle or nearly the entire region except at both ends. CONSTITUTION:The lip-shaped nozzle 6 is formed by crossing of the recessed surface 2 and the V-groove 5. The straight part 6a parallel or nearly parallel with the axial line is provided over the entire region at the mouth edge of the nozzle 6 or nearly the entire region except both ends. Expansion in the nozzle by wear is suppressed by such simple constitution, by which the reduction in the sectorial angle of spraying and the increase in discharge rate are prevented. The degree of the increase in the discharge quantity is decreased to 60% as compared to the conventional nozzle.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a fan-shaped spray nozzle that sprays pressurized liquid in a fan shape, and particularly to a nozzle suitable for painting or applying adhesives.

[Prior art and its problems]

As shown in FIGS. 1 and 2, a conventional nozzle for spraying pressurized liquid in a fan shape has a nozzle body 1 with a dome-shaped concave surface 2 and a continuous circular cylindrical surface 3. A lip-shaped nozzle 6 is formed by providing a concave hole 4 in a rearward open state, and by providing a groove 5 with a V-shaped cross section at the tip of the nozzle body 1 so as to appropriately intersect with the dome-shaped concave surface 2.
Orifice-type nozzles are often used.

Since the lip-shaped nozzle 6 has a sharp knife edge, when spraying a liquid containing a component that accelerates abrasion, such as a metallic paint, the abrasion is significant, and the abrasion causes the spray to form a fan-like shape. As the angle decreases, the discharge amount per unit time increases, resulting in a rapid thickening of the coating film. For example, after 10 hours of use, the fan angle of the spray is reduced to 68%, Discharge amount is 1
There is measurement data showing that the film thickness increases by 98%, and therefore the film thickness becomes 2.9 times.

Therefore, by varying the shape of the dome-shaped concave surface 2 and the angle of the 7-shaped groove 5 to make the dome-shaped concave hole 4 streamlined as shown in FIG. 3, and by narrowing the angle of the groove 5, wear can be reduced. It was found that it was suppressed. However, depending on the properties of the liquid to be sprayed, the coating thickness tends to be uneven, such as the spray being concentrated near both ends, and there is a limit to streamlining the dome shape and narrowing the angle of the V-shaped groove. In the case of the shape as shown in FIG. 3, the sector angle is wide and the discharge amount is small, so there is a disadvantage that it is not suitable as a nozzle for thick film coating.

[Purpose of the invention]

The object of the present invention is to provide a wear-resistant orifice type fan-shaped spray nozzle of this type.

[Failure to solve problems]

In order to achieve the above object, the present invention provides a straight surface portion substantially parallel to the axis of the nozzle without forming a majority of the lip-shaped nozzle hole formed by the intersection of a concave surface and a V-shaped groove into a knife edge. It is characterized by:

〔Example〕

Hereinafter, one illustrated embodiment of the fan-shaped spray nozzle of the present invention will be described in detail.

As shown in FIGS. 4 to 6, a nozzle body 1 made of an ultra-hard material such as cemented carbide, fine ceramics, or zirconia has a dome-shaped concave surface 2 and a circular cylindrical surface 3 continuous to the concave surface 2. A recessed hole 4 is provided in a rearward open state based on the longitudinal axis, and a groove 5 with a V-shaped cross section is provided at the tip of the nozzle body 1 so as to appropriately intersect with the recessed surface 2. The spout 6 is formed in the shape of a spout 6, and in particular
A straight surface part 6a is provided on the entire mouth edge of the nozzle, which is parallel or almost parallel to the nozzle axis, thereby significantly reducing the degree of wear when the liquid to be sprayed passes at high speed than in the case of a knife, and prevents the nozzle from being worn out. Since deformation is suppressed, changes in the sector angle and discharge amount of rtB mist can be suppressed to a small extent.

In manufacturing, after manufacturing a conventional product, insert a core wire with a round shape on both sides corresponding to the nozzle 6 into the nozzle 6 and vibrate or reciprocate while adding an abrasive and polishing. After manufacturing the nozzle body 1, it may be polished by electric discharge machining using an electrode made of a core wire slightly thicker than the nozzle 6, and the nozzle body 1 may be polished as shown in FIGS. 7 and 8. When powder molding the material A, a core 9 is used which has a mold surface 7 adapted to molding the concave surface 2 and a mold surface 8 adapted to molding the cylindrical surface 3.
A mold surface 1 adapted for molding the straight surface portion 6a is provided at the tip of the mold surface 1.
A lower mold 12 is provided with a protrusion 11 having 0, and thus has a core 9.
, an outer mold 13 and an upper mold 14 are prepared, and first, with the lower mold 12 and the outer mold 13 combined, the inside of the outer mold 13 is filled with material powder such as cemented carbide, and then the upper mold is prepared. After press-molding the material A by forcefully advancing the mold 14 from above, this material A
is taken out and sintered, and such a material A is ground with a V-shaped grindstone type B to a depth such that the straight surface portion 6a remains, as shown by the chain line in FIG. 9, to form grooves 5. It can be easily manufactured by a one-step grinding process.

Since manufacturing the core 9 requires advanced technology, instead of this, as shown in Figs. 10 to 12, the mold surface 7 is made almost semicylindrical, and the mold surface 8 is made into a rectangular tube shape. The core 9 may be mechanically ground so that it can be manufactured easily, and in this case, the mold surface 8 can also be made into a cylindrical shape.

In addition to the above-described embodiments, the boundary between the concave surface 2 and the straight surface portion 6a may be rounded as shown in FIG. The shape can be easily formed by electrolytic polishing or other mechanical processing rather than by molding.

In the embodiment described above, the straight surface portion 6a is provided over the entire area of the nozzle 6, but the straight surface portion 6a may be omitted from both ends of the nozzle 6 as shown in FIGS. 14 and 15. By causing both ends of the trailing nozzle 6 to wear out earlier than other parts and promoting widening of the fan-shaped angle of the spray, it is possible to compensate for the narrowing of the fan-shaped angle due to overall wear. It is.

Regarding the shape of the 7-shaped groove 5, see (a) in Fig. 16.
Of course, it may also have a modified V-shape as shown in e).

〔Effect of the invention〕

As explained above, according to the present invention, since the straight surface portion is provided on the mouth edge of the lip-shaped nozzle formed by the intersection of the concave surface and the V-shaped groove, it is possible to prevent the nozzle from being worn out due to wear, with an extremely simple structure. It was found that the enlargement was suppressed, the reduction of the fan angle of the spray and the increase in the discharge amount were prevented, and the degree of increase in the discharge amount was reduced to 60% compared to the conventional product.

[Brief explanation of the drawing]

In the drawings, FIGS. 1 and 2 are a longitudinal side view and a front view, respectively, illustrating a conventional fan-shaped spray nozzle, FIG. 3 is a longitudinal side view of another conventional product, and FIGS.
The figures show a fan-shaped spray nozzle of the present invention in one embodiment, in which FIGS. 4 and 5 are a vertical side view and a front view, respectively, FIG. 6 is a cross-sectional plan view, and FIG. 7 is a nozzle body. 8 is a plan view of only the lower die, FIG. 9 is an explanatory view showing the state of grinding the nozzle material after molding, and FIGS. 10 to 12 are different views. 10 shows a side view, FIG. 11 shows a front view, FIG. 12 shows a plan view, and FIG. 13 shows other parts. FIG. 14 and FIG. 15 are a vertical side view and a cross-sectional plan view showing still another embodiment, respectively, and FIG. 16 is another example of a V-shaped groove. It is a schematic diagram showing each separately. 2... Concave surface 5... V-shaped groove 6... Nozzle 6a... Φ straight surface part

Claims (1)

[Claims] A fan-shaped spray nozzle having a lip-shaped nozzle formed by the intersection of a concave surface and a V-shaped groove, and having a straight portion parallel or almost parallel to the axis over the entire mouth edge of the nozzle or almost the entire area excluding both ends. Fan-shaped spray nozzle.