JPH044832Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a fan-shaped spray nozzle, and is mainly used for finishing coating.

[Problems with conventional technology]

A commonly used nozzle for fan-shaped spraying is an orifice-type flat blowing nozzle in which a lip-shaped nozzle is formed by the intersection of a dome-shaped recessed hole and a V-shaped groove. In order to adapt to spraying, it is necessary to narrow the width of the V-shaped groove and make it intersect deeply when forming the nozzle, but if you simply form such a narrow nozzle, you can obtain a certain degree of wide-angle spray, but the spray During the propulsion process, the fan-shaped angle immediately after injection tends to narrow without sustaining it, so it is not only unsuitable for coating a wide area, but also has the disadvantage of low coating efficiency.

As a measure to prevent the fan angle from gradually decreasing toward the front, the V-shaped groove is made into a trapezoid, which achieves a certain degree of wide-angle fan spray and improved application efficiency, but is not sufficient. is not satisfactory.

In addition, as an example of a nozzle suitable for wide-angle fan-shaped spray, there is a technology in which a nearly saddle-shaped nozzle is formed by intersecting a medium-deep V-shaped internal groove that gradually deepens in the center with a trapezoidal external groove. According to this technology, a fan-shaped spray angle is formed at over 100 degrees (previous technology was about several tens of degrees), but the atomization efficiency is low and it is difficult to use in thin film coating. It has the disadvantage that it is not suitable for finishing coating because it tends to cause spots, and when spraying liquids with high specific gravity such as metallic paints, it is not possible to eliminate the unbalanced weight at both ends of the fan-shaped spray, which also makes it difficult to apply finishing coating. It is not suitable for painting.

[Purpose of invention]

The purpose of the present invention is to provide a nozzle that not only can produce a wide-angle fan-shaped spray to form a uniform film thickness without bias toward both ends or unevenness, but also is suitable for finishing coating with high coating efficiency. It is something.

[Characteristics of the invention] In order to achieve the above object, the present invention provides an internal groove with a rounded, almost trapezoidal cross section with a wide bottom in a backward open state in the nozzle main body, and a groove near the center of the bottom of the internal groove. A dome-shaped recess with a diameter sufficiently smaller than the width of the bottom of the internal groove is provided, and an external groove having a wide bottom with a trapezoidal cross section or the like is provided at the tip of the nozzle main body, and is placed three-dimensionally at right angles to the internal groove. It is characterized in that the lip-shaped nozzle is formed by deeply intersecting the depression while being formed in an intersecting manner.

〔Example〕

The present invention will now be described in detail with reference to the illustrated embodiments.

A nozzle main body 1 made of a super hard material such as cemented carbide or ceramic has a wide bottom with a rounded cross section and a substantially trapezoidal shape, and the circumferential side of the nozzle main body 1 remains without cutting through the internal groove 2 in the left and right direction. In addition to being provided in an open state, a dome-shaped recess 3 that is sufficiently smaller than the width of the bottom of the internal groove 2 is provided near the center of the bottom of the internal groove 2 so that shoulders 4 are formed on both sides of the bottom of the internal groove 2. Further, at the tip of the nozzle main body 1, a vertical external groove 5 having a trapezoidal cross section is formed, which is different from the internal groove 2 when viewed from the front, that is, from the nozzle axis direction, with the groove bottoms close to each other and not intersecting. At the same time, the external groove 5 is provided so as to deeply intersect the depression 3 near the bottom of the groove, and a lip-shaped nozzle 6 is opened by this intersection. By supplying the paint from the rear of the groove 2 under a pressure of several tens to several tens of kg/ ^cm2 , it is possible to eject a wide-angle fan-shaped spray with good atomization and high coating efficiency. It can be done.

Regarding the relationship between the nozzle main body 1, the internal groove 2, the depression 3, and the external groove 5, as shown in detail in FIG. 4, the axis of the nozzle main body 1 is aligned with the nozzle axis The internal grooves 2 are formed in the left-right direction with a trapezoidal cross section divided into two by a plane of symmetry H in a horizontal state including the axis X,
The axis of the recess 3 is common to the axis X, and the external groove 5 is formed vertically with a trapezoidal cross section divided into two by a vertical symmetry plane V including the axis X, and the internal groove 2 The groove bottoms of the grooves and the external grooves 5 are close to each other but do not intersect, and when viewed from the front, they are formed in a three-dimensional cross-shape, with a cross shape at right angles. As a result, the lip-shaped nozzle 6 opens.

The shape and proportion of the external groove 2 can be selected depending on the properties and concentration of the paint to be supplied. Any of the shapes may be adopted as appropriate.

[Effect]

As explained above, according to the present invention, the following effects can be obtained.

(a) An internal groove with a wide base of rounded, approximately trapezoidal cross-section has a depression in the center of the groove so as to form shoulders on both sides, and this depression is deeply intersected by an external groove with a wide base; Since the lip-shaped nozzle is formed, the pressurized paint is fed from behind without any pressure loss at the back of the nozzle, and as a result, the speed increases due to both slopes and the paint tends to collide. It has the effect of improving atomization and preventing tail formation.

(b) Since the cross-sectional shape of the external groove is formed into a trapezoid, a U-shape, or a U-shape, the width near the bottom of the groove is wide, so that a wide-angle fan-shaped spray can be easily obtained.

(c) Due to the internal groove having a nearly trapezoidal cross section, the paint is accelerated by the guidance of both wedge-shaped slopes, is deflected toward the center by the dead end part of the internal groove, and collides inside the nozzle. Since it is injected from a lip-shaped nozzle, a wide-angle fan-shaped spray can be easily obtained.

(d) Due to the internal groove having an almost trapezoidal cross section, the speed of the paint accelerated by the guidance of both wedge-shaped slopes is deflected towards the center by the dead end part of the internal groove, and the deflected flow is further directed towards the center at the shoulder part. Because these particles collide violently and are disturbed upstream near the nozzle, and because the nozzle has a lip-like shape, the flow velocity and pressure distribution are equalized, making it easy to obtain a wide-angle fan-shaped spray with a uniform distribution. Therefore, in painting, the distribution of the paint is not biased toward both ends of the fan shape, and a beautiful paint film without mottling can be easily obtained.

Furthermore, because the width of the bottom of the internal groove is wide, the pressurized liquid colliding with each other upstream just before the nozzle causes a wide range of liquid streams to collide with each other.
This prevents the phenomenon of biasing the weight toward both ends, which occurs in the case of a letter-like shape, and together with the lip-shaped nozzle formed in the dome, a more even distribution is obtained.

(e) Since a shoulder is formed at the boundary between the internal groove and the depression, this helps improve atomization at both ends of the fan-shaped spray and prevents the formation of a tail.

(f) The internal groove prevents pressure loss and increases the speed, increasing the propulsion speed, and since the bottom of the external groove is wide, scattering of the spray at both edges is prevented, resulting in high coating efficiency.

(g) Wide-angle fan-shaped spray with uniform distribution can be easily obtained, and the occurrence of spots and tails can be reliably prevented, so finishing coating can be applied over a wide range of areas with high efficiency.

[Brief explanation of the drawing]

The drawings show a nozzle of the present invention in one embodiment of the present invention, and FIGS. 1 and 2 are respectively a longitudinal sectional side view and a front view of the nozzle of the present invention in one embodiment, and FIG. Lines in the diagram -
FIG. 4 is a cross-sectional plan view for explaining the intersecting state of the grooves. 1... Nozzle main body, 2... Internal groove, 3... Recess, 4... Shoulder, 5... External groove, 6... Nozzle.

Claims (1)

[Scope of utility model registration request] A left-right internal groove 2 having a wide bottom with a rounded, almost trapezoidal cross section is provided in the nozzle main body 1 in a rearward open state, and a groove 2 near the center of the bottom is wider than the width of the bottom of the internal groove 2. A small-diameter dome-shaped recess 3 is provided on both sides of the bottom of the internal groove 2, with shoulders 4, 4 formed therein, and a trapezoidal, U-shaped, or U-shaped cross section is provided at the tip of the nozzle main body 1. The external groove 5 in the vertical direction is provided in an angular relationship with the internal groove 2 so that the groove bottoms are close to each other and do not intersect, forming a cross shape at right angles when viewed from the front. A fan-shaped spray nozzle suitable for finishing coating, which is formed by forming a lip-shaped nozzle 6 by deeply intersecting a depression 3 at a part near the bottom of the groove.