JPS591097B2 - Atomization nozzle - Google Patents

Description

[Detailed description of the invention] The present invention relates to an atomizing nozzle.

Atomizing nozzles can be broadly classified into pressure nozzles, rotating nozzles, and gas atomizing nozzles that atomize fluid using gas, and the present invention relates to gas atomizing nozzles.

FIG. 10 shows a conventional mortar gun in which this gas atomizing nozzle is used, in which 50 is a hopper for charging mortar, 51 is a mortar flow passage continuing to the lower part of this hopper, and the mortar A circular nozzle 5-2 and an air blowing nozzle 53 are provided at the end of the channel. This air blowing nozzle 53 is connected to a compressed air source (not shown), and is configured to be able to move back and forth, so that the distance from the circular nozzle 52 can be adjusted. In the case of an atomizing nozzle having such a configuration, finer particles can be obtained than in the pressure nozzle or rotary nozzle, and it is possible to atomize liquid with high viscosity.

However, as shown in Figure 1, when handling high viscosity fluids such as mortar, even if the above-mentioned atomization nozzle is used, sufficiently fine particles cannot be obtained and the discharge amount is insufficient. It was enough. The amount of discharge and the atomization of particles are in an inversely proportional relationship, and when the air blowing nozzle 53 is brought closer to the circular nozzle 52, the particles become atomized, but the amount of discharge is drastically reduced; Circular nozzle 52
If it is moved away from the surface, the ejection amount will increase, but the atomization will be poor and the particles will be ejected in the form of small lumps. If the particles are poorly atomized, it will be difficult to finish the coated surface smoothly, and if the discharge amount is small, the work efficiency will drop significantly. In addition to these drawbacks, in the case of conventional nozzles, the air advances straight from the air blowing nozzle 53 and hits the spraying surface, resulting in a so-called donut-shaped pattern in which the sprayed fluid in the central part of the spray pattern becomes thinner. This has the drawback of causing a problem, which is also a factor in reducing work efficiency, and there has been a desire for a nozzle that has good work efficiency and can provide a smooth painted surface. In addition, in recent years, high viscosity pingam fluid such as resin mortar is sprayed onto the steel surface at a rate of 5 to 6 m/m, especially for the purpose of heavy corrosion protection of marine steel structures.
In recent years, long-term anti-corrosion coating has begun to be applied to splash zones and tidal zones where cathodic protection is not effective. There is a strong desire to develop a new nozzle that can provide a good and smooth spray surface. The present invention was devised in response to the above-mentioned demand, and is made to flow the fluid to be atomized through a flow passage, and to blow atomizing gas into the flow passage, whereby the fluid to be atomized is caused to flow through a flow passage. At the same time as the fluid and the atomizing gas are mixed, the fluid to be atomized is given swirling motion and movement in the flow direction, and the edges provided in the flow passage create turbulent flow, resulting in the formation of fine particles. The object of the present invention is to provide an atomizing nozzle that is particularly suitable for high-viscosity fluids and can increase the discharge power.

An embodiment of the present invention will be described below based on the drawings.

2 and 3 each show an embodiment of the nozzle according to the present invention. The embodiment shown in FIG. In the embodiment, the front part of the flow passage is shaped like a bumper, and the spray nozzle in both Figures 2 and 3 is circular, and the embodiment shown in Figure 4 has a flat spray nozzle in the embodiment shown in Figure 3. It is oval shaped.

In the figure, 1 is a nozzle main body, which has a substantially cylindrical shape. A flow passage 2 for conveying the fluid to be atomized is provided in the longitudinal direction of the nozzle body 1, and an atomization gas flow passage 3 is provided here.
is open. An edge portion 23 is formed in front of the opening by reducing the diameter of the passage.
The opening at one end of the flow path 2 forms a fluid inlet 5 into which the fluid to be atomized flows, and the opening at the other end forms a spray port. This spray nozzle is a circular spray nozzle 4 in the example shown in FIGS. 2 and 3, and a flat oval spray nozzle 4' in the example shown in FIG. In the example shown in FIG. 2, the front part of the edge part 23 of the flow passage 2, that is, on the spray nozzle 4, 4' side, is the cylindrical part 22, and in the examples shown in FIGS. 3 and 4,
The flange-like portions 22' and 22'e are formed, and the fluid inlet 5 side forms a cylindrical straight portion 21 with a circular cross section. The rattle-shaped portion 27' of the one shown in FIG.
As shown in Figure d, as it approaches the spray nozzle 4', its both sides are gradually constricted to form the flat oval spray nozzle l as described above. The diameter of the cylindrical straight portion 21 is formed to be larger than the diameter of the minimum diameter portion at the base of the cylindrical portion 22 or the rattle-shaped portions 22', 22'b, so that the cylindrical straight portion 21 and the cylindrical portion 22 or the rattle-shaped portion The edge portion 23 described above is formed at the boundary between the nozzle body 1 and the cylindrical straight portion 21. It's summery.

As shown in FIGS. 2-C, 3-C, and 4-C, the flow path 3 is obliquely incident on the cylindrical portion 21 and its longitudinal center line, and the flow path 3 is The atomizing gas flowing out from the channel 3 into the straight section 21 is configured to impart movement to the fluid to be atomized from the fluid inlet 5 in the direction of the spray ports 4, 4'. In addition, as shown in FIG. 2-d, FIG. 3-d, and FIG. 4-e, the flow path 3 enters the cylindrical straight portion 21 from a substantially tangential direction of the circular cross section, and is not atomized. It is configured to give a swirling motion to the fluid to be processed. In the examples shown in FIGS. 2, 3, and 4, four channels 3 are provided at equal intervals, but the present invention is not limited to this, and it is sufficient to provide at least two channels. Next, the operation of this nozzle will be explained.
The liquid to be atomized that is pressurized from the fluid inlet 5 is stirred and mixed with the gas from the atomizing gas flow path 3 in the cylindrical straight portion 21 of the flow path 2 . At this time, the gas is transferred to the cylindrical straight section 2
As mentioned above in Section 1, since it flows in diagonally and tangentially, the fluid to be atomized is given a swirling motion and a motion in the flow direction. This swirling motion allows the fluid to be atomized and the atomizing gas to be mixed and stirred extremely well. This mixed flow of fluid and gas advances to the cylindrical part 22 or the flap shapes 27, 22'' and reaches the spray ports 4, 4'.At this time, the nozzle according to the present invention is different from the conventional suction type nozzle using negative pressure. Unlike,
Since it is a pressurized type and the shape resistance in the flow passage is small, the flow rate of fluid is large and the discharge amount is large. Spray port 4, 4'
In this case, this mixed flow suddenly expands when it comes into contact with external atmospheric pressure, and the fluid becomes firstly finely divided and flies forward due to the reaction force of this expansion. The mixed flow continues to expand during flight, and the fluid particles are re-split into secondary and tertiary particles due to the front air resistance, promoting miniaturization. Furthermore, since the edge part 23 is formed, the mixed flow of fluid and gas hits this edge part 23, causing turbulence, and a part of the straight velocity energy is converted to turbulent energy, and the brown color of the fluid particles is generated. Exercise becomes more intense;
As a result, the mixing and agitation of the fluid and gas is promoted, and the miniaturization of fluid particles is promoted.

In addition, in the examples shown in FIGS. 3 and 4, the mixed flow expands in front of the spray nozzle as the cross-sectional area of the lapped portions 22' and 22'' gradually increases, and is atomized. The effect will be even higher.

Furthermore, in the nozzle shown in FIG. 4, since the spray nozzle 4' is shaped like a flat oval, the mixed flow flows through the bulge-shaped portion 22! 'in,
It reaches the spray nozzle 4' while being gradually crushed.

At this time, this mixed flow is a particulate flow in which the fluid and gas are sufficiently mixed, so it is easily crushed and does not adhere to the road wall of the bumper-shaped portion 22'', creating turbulent flow and negative pressure. It is possible to obtain a circular spray pattern, which is not possible with the conventional method of atomizing the particles.When the spray pattern is made oval in this way, it is possible to obtain a spray pattern in the narrow part or the edge near the edge. , it becomes possible to spray a specified film thickness at a specified location without wasting the spray fluid.The embodiments shown in FIGS. This is just an example, and various other embodiments are possible.

For example, the example shown in FIG. 5 and FIG.
The nozzle in the figure has a long-shaped bench lily with a longer path at the constriction part.Since the cross section of this nozzle is gradually expanded, the forward speed of the paint particles is not impaired compared to the former nozzle, so the flight distance is longer, and the gun This allows for a longer distance between the paint and the object to be painted, resulting in a larger painting pattern on the reaching surface. In addition, since it is well stirred during the long journey, the uniformity of the coating particles is further promoted. Further, the discharge amount is also larger than that shown in FIGS. 3 and 4. Note that FIG. 7 shows an example of a handgun equipped with a nozzle according to the present invention. In the figure, 10 is a handgun main body, 11 is a cap that holds down the nozzle main body 1, 12 is a fluid connection path to be atomized (the valve is not shown), and 13 is the atomization gas connection path (the valve is not shown). One end of the fluid connection path 12 is connected to the fluid inlet 5 of the nozzle body 1, and the other end is connected to a fluid pressure tank (not shown) via a hose or the like. Further, one end of the atomizing gas connection path 13 is connected to the atomizing gas flow path 3 of the nozzle body 1, and the other end is connected to a gas source (not shown) via a hose or the like. In the case of such a hand gun, unlike the conventional gun shown in Figure 1, there is no need to put the fluid to be atomized into a hopper, so there is no reduction in work due to the weight of the fluid, and it is directly connected to the fluid pressure tank. Therefore, the fluid supply is not interrupted, and the gun can be erected even when the spraying surface is horizontal, resulting in extremely high work efficiency. As explained above, in the case of the nozzle according to the present invention, gas is blown into the fluid to cause swirling motion, and turbulence is caused by the edge portion, so that the mixing and agitation of the liquid and gas is good. Finer fluid particles can be obtained than with conventional nozzles.

Further, since the resistance of the nozzle flow passage is small, the amount of fluid discharged is 2 to 6 times greater than that of the conventional one, and a donut-shaped spray pattern does not occur, resulting in improved workability. Furthermore, since the mixed flow of fluid and gas ejected from the spray nozzle is a swirling flow, the forward speed of the object toward the sprayed surface is reduced by the tangential direction of the swirling flow, and as a result, This has the effect of reducing splashing of the fluid from the surface being sprayed, and preventing unnecessary splashing. Although the above description has been made regarding a fluid or slurry such as mortar, the present invention is also applicable to spraying of powder or granular materials such as blasting.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of a conventional atomizing nozzle and a mortar gun using the same, Fig. 2 is a front view showing an embodiment of the nozzle according to the present invention, and Fig. 2-a is its left side. Figure 2-b is a right side view, Figure 2-c is a cross-sectional view taken along line cc in Figure 2-a, and Figure 2-d is d in Figure 2.
FIG. 3 is a front view showing another embodiment of the nozzle according to the present invention, FIG. 3-a is a left side view thereof, and FIG.
Figure b is a right side view, and Figure 3-c is a side view of Figure 3-a.
3-d is a sectional view taken along line dd in FIG. 3, FIG. 4 is a front view showing still another embodiment of the nozzle according to the present invention, and FIG. Left side view, No. 4-b
The figure is a right side view, and Figure 4-c is the c- in Figure 4-a.
c Longitudinal cross-sectional view, Figure 4-d is d-d in Figure 4-a.
4-e is a sectional view taken along line ee in FIG. 4, FIG. 5 is a front view showing still another embodiment of the nozzle according to the present invention, and FIG. 5-a is a left side view thereof. Figure 5-b is a right side view, Figure 5-c is a sectional view taken along the line CC in Figure 5-a, Figure 5-d is a sectional view taken along the line dd in Figure 5, and Figure 5-c is a sectional view taken along the line dd in Figure 5. The figures are a front view showing still another embodiment of the nozzle according to the present invention, FIG. 6-a is a left side view thereof, FIG. 6-b is a right side view thereof, and FIG. 6-d is a sectional view taken along line dd in FIG. 6-a, FIG. 6-e is a sectional view taken along line ee-e in FIG. 6, and FIG. FIG. 1 is an explanatory diagram showing a handgun equipped with a nozzle according to the present invention. In the figure, 1 is the nozzle body, 2 is the flow path, 3 is the atomizing gas flow path, 4 and 4' are the spray ports, 5 is the fluid flow port, 10 is the handgun body, 11 is the cap, and 12 is the fluid Connecting path, 1
3 is a gas connection path for atomization.

Claims (1)

[Scope of Claims] 1. A flow passageway through which a fluid to be atomized and an atomizing gas are mixed and conveyed, and a flow passageway configured to give the fluid to be atomized a swirling motion and a motion in the flow direction. An atomizing gas flow path having an opening in the flow passage, and an edge portion formed by reducing the diameter of the passage in front of the opening of the flow passage. Atomization nozzle. 2. The atomizing nozzle according to claim 1, wherein the front part of the edge part of the flow passage is a straight tubular part. 3. The atomizing nozzle according to claim 1, wherein the front part of the edge part of the flow passage is a truss-shaped part. 4. The atomizing nozzle according to claim 1, wherein the front part of the edge part of the flow passage is ventilated. 5. The atomizing nozzle according to claim 1, 2, 3, or 4, wherein the spray port at the tip of the nozzle has a flat oval shape.