JPH0330853A - Spray apparatus - Google Patents

Abstract

PURPOSE:To enable a spray material to be atomized without using a spray nozzle by installing a supply part of a spray material supply device in a chamber surrounded by jet air. CONSTITUTION:A spray material 1, which is supplied in a non-sprayed state from a pipe line, is transferred longitudinally through a chamber 12 by a weak wind derived from a jet air 10 and caught into the air stream. At this time, there is a large difference between a transfer velocity of the spray material 1 and a flow velocity of the jet air 10. Therefore, the spray material 1 is divided into pieces as if it were scraped off by the jet air 10, struck by the jet air 10 of different directions while it passes through a convergent part 14 so as to be further atomized and diffused into the air stream. It is possible to atomize the spray material 1 without using a spray nozzle as mentioned above.

Description

Detailed Description of the Invention (a) Industrial Application Field The present invention relates to a spraying device for spraying and supplying flowing materials such as paints, blasting materials, adhesives, powders, etc. The target is atomizing equipment that atomizes fluid materials.

(b) Conventional Apparatus As a typical example of a spraying apparatus using compressed air, an air atomization type painting spray gun is generally widely used. An air cap is attached to the tip of the paint nozzle, and the paint and air are mixed at the paint nozzle opening to atomize the coating liquid.If necessary, an auxiliary air nozzle opening can be installed.
It promotes the atomization of paint, adjusts the coating pattern, and prevents spray paint from scattering.

In addition to the air atomization method described above, painting spray guns also spray highly pressurized coating liquid at high speed from a small diameter nozzle tip, and atomize it by friction with the surrounding air. Airless systems are also widely used.

In order to clean and roughen painted or thermally sprayed surfaces, blasting machines that eject blasting material from a blast nozzle together with compressed air are also widely used.

(c) Problems to be Solved by the Invention Conventional spraying devices cannot lack a paint nozzle for atomizing the coating liquid. Therefore, the problem of clogging in the paint nozzle always persists, and it is necessary to perform troublesome disassembly and cleaning every time spraying work is performed. In addition, most of the failures, such as malfunctions of spray devices and pattern failures, are caused by paint nozzles, and their management is troublesome. These problems also occurred with airless spray guns.

A second problem with the conventional device is that a large amount of ineffective mist is generated during spraying. This is because the paint is atomized by the collision of multiple jet airs that intersect with each other at the paint nozzle opening, which weakens the straightness of the airflow after collision and impedes its directivity. . If there is a large amount of ineffective mist, the coating fluid will be wasted and the working environment will be contaminated by the coating fluid and solvent.

As a countermeasure against ineffective mist, it has previously been proposed that an annular air nozzle is installed around the paint nozzle in an airless spray can, and the air curtain ejected from this nozzle wraps the paint spray area ( Japanese Unexamined Patent Publication 1983
-206066, Utility Model Application Publication No. 57-55560). However, this method has the disadvantage that, at the same time as the coating liquid is being sprayed, a part of the air curtain scans the wet spraying surface in a trailing manner, which disturbs the spraying surface and degrades the quality of the coating film. Another disadvantage is that an air nozzle for the air curtain is required separately from the spray mechanism.

Furthermore, the conventional apparatus has the disadvantage that the manufacturing cost of the spray apparatus is high because it is necessary to precisely form the spray mechanism such as the paint nozzle or to precisely form the mutual positional relationship with the air nozzle. In particular, airless spray guns
Since the coating liquid is pressurized to a high pressure of 100 to 200 kg/~, not only the spray gun but also the paint supply system are expensive.

On the other hand, since blasting machines use silica sand, river sand, or metal grid as the blasting material, there is a drawback that the blasting nozzle opening is likely to wear out when the blasting material is ejected together with compressed air.

This invention solves the above problems by simplifying the structure of the spraying mechanism.
It is designed to achieve the objectives listed below.

The first purpose is to solve the problem of nozzle clogging that was inevitable in spray equipment, and on the other hand, to solve the problem of nozzle wear that was inevitable in Plus 1 to machine.
The purpose is to facilitate its handling and simplify management work.

The second purpose is to prevent the generation of ineffective mist, eliminate wasteful consumption of coating fluid, and at the same time, eliminate contamination of the working environment with ineffective mist.

The third purpose is to simplify the structure of the spray mechanism and to provide the spray device at low cost.

The fourth purpose is to improve the reliability of the spray device by making it possible to perform atomization reliably and stably using a new and simplified spray 'a' side.

(d) Means for Solving the Problems The spraying device of the present invention includes a spraying material supplying means 2 that supplies the spraying material 1 in a non-atomized state, and an air nozzle that sprays jet air 10 to atomize the spraying material 1. It is composed of 3,
Jet Air 10 differs from conventional air atomization spray guns and Plus 1 to machines in that it supplies the spray material 1 in a non-atomized form.
This differs from a conventional airless spray gun in that the spray material 1 is atomized by the .

The air nozzle 3 has a nozzle port 7 that ejects planar jet air 10, and the jet air direction of the nozzle port 7 is set so that the jet air 10 converges toward the spray center axis P and forms a convergent airflow 13 after convergence. To be lazy. Then, the supply section 11 of the spray material supply means 2 is arranged in the chamber 12 surrounded by the jet air 10.

The jet air 10 can be supplied in two ways: a pair of nozzle ports 7 are arranged with the supply section 11 of the spray material supply means 2 in between, and a planar jet air 10 is spouted from both nozzle ports 7; Preferably, the opening 7 is formed into an annular shape and a cone-shaped jet air 10 is ejected.

Furthermore, in the case where a pair of jet air 10 is ejected, the thickness center line A1 of the pair of jet air 10 is converged toward the spray center axis P, and the width direction center line A2 is set relative to the spray center axis P. Preferably, they are tilted in opposite directions.

(E) Function/Operation In the spraying device of the present invention, the spray material 1 is supplied in a non-sprayed form without using a nozzle by flowing the spray material 1 or by discharging the pressurized spray material 1 from the conduit. The supplied spray material 1 moves longitudinally through the chamber 12 by a weak wind derived from the jet air 10 and is taken into the airflow.

There is a large difference between the moving speed of the spray material 1 and the flow speed of the jet air 10 when it is taken into the air stream. For this reason, the spray material 1 is fragmented as if scraped off by the jet air 10, and further, while passing through the convergence section 14, it is struck by jet air in a different direction and becomes atomized, and dispersed in the air flow. do.

The jet air 10 joins together at the convergence part 14 to form one convergence flow 13 along the spray central axis P.

This converging flow 13 consists of an orderly flow with strong directionality, and rather reduces its speed while drawing surrounding air into the airflow, and collides with the target surface.

As described above, by supplying the spray material 1 in a non-sprayed form, the spray nozzle can be omitted, and problems caused by the spray nozzle can be eliminated.

The atomized spray material 1 in the convergence section 14 is carried to the target surface by a directional, strong convergence flow 13. Therefore, generation of ineffective mist can be prevented, and environmental pollution caused by the spray material 1 and the like can be eliminated.

As a spraying mechanism, it is possible to omit a spray nozzle, etc., which is fine and requires a high degree of processing precision, and the spray material 1 is atomized onto the target surface using only the spray material supply means 2 and the air nozzle 3, which have a very simple structure. Can be supplied. Therefore, the spray device can be manufactured at low cost.

Since the spray material supplying means 2 can supply the spray material 1 from a relatively large-diameter supply port in a non-spraying state, there is no fear of clogging or wear. Further, the spray material 1 is atomized by the flow action of the jet air 10. In other words, since the atomized material 1 can be atomized and supplied in a state where there are no unstable factors, atomization can be reliably and stably performed.

(f) First example 1 to 4 illustrate a first embodiment of the invention.

This spraying device includes a spraying material supply means 2 for supplying a spraying material 1 such as paint, blasting material, adhesive, or powder, and an air nozzle 3 for atomizing the spraying material 1. Configure the mechanism.

The spray material supply means 2 has a tank or cup-shaped container 4 for storing the spray material 1, and a supply pipe 5 led out from the container 4, and supplies compressed air supplied through an air passage 6. Under pressure, the spray material 1 in the container 4 is released from the supply pipe 5. Although not shown, the supply pipe 5 is provided with an on-off valve that cuts off and on the supply of the spray material 1 and a flow rate control valve that adjusts the amount of discharge.

15 is a surface to be sprayed.

In FIG. 2, the air nozzle 3 is formed in the shape of a vertically elongated hollow box, and has a pair of left and right nozzle ports 7 opened in its front end wall. The aforementioned supply pipe 5 is provided so as to penetrate approximately the center of the air nozzle 3 back and forth.
Both nozzle ports 7 are arranged at symmetrical positions with the two nozzle ports 7 in between.

8 is a joint for connecting an air hose.

Each nozzle port 7 is constituted by a group of small holes forming a vertical straight line, and jets out a planar jet air 10 having a single-shaped cross section. As shown in FIG. 3, the jetting direction of the nozzle port 7 is oriented such that the thickness center line A1 of the jet air 10 converges toward the spray center axis P forward of the outlet (supply section) 11 of the supply pipe 5. ing. As a result, a V-shaped air curtain in plan view is formed by both jet air 10, and a wedge-shaped chamber 12 is defined inside the air curtain. The jet air 10 joins before and after the thickness center line A1 to form - number of convergent airflows 13. This converging airflow 13 is centered on the spray center axis P
It is formed in a straight line, with the cross-sectional area gradually increasing along the direction, and exhibits strong directivity.

The outlet 11 of the supply pipe 5 is located above the spray center INIIP in the air chamber 12, and is located approximately in the center between the convergence part 14 of both jet air 10 and the front surface of the air nozzle 3.

In the spraying mechanism configured as described above, the spray material 1 is supplied in a non-sprayed form. Specifically, the spray material 1 is simply discharged into the chamber 12 from the outlet 11 of the supply pipe 5 . chamber 1
Due to the weak wind derived from Jet Air 10,
A weak flow toward the convergence section 14 is formed. Therefore, the spray material 1 moves toward the convergence part 14 while being gradually accelerated by a weak airflow, and during this movement, it is separated into small lumps and finally taken into the jet air 10 from inside.

By the way, there is a large difference between the moving speed of the spray material 1 and the flow speed of the jet air 10. Therefore, the spray material 1 is scraped by the jet air 10 and taken into the airflow, and is divided into pieces. Eventually, the finely divided spray material 1 becomes
Both jet airs 10 pass through a convergence section 14 where they collide.

The specific gravity of the spray material 1 is greater than that of air. Therefore, convergence part 1
4, the sprayed material 1 is thrown out across the unsteady interface between both jet airs 10, and is struck by the jet airs 10 in different directions to be atomized. At the same time, the spray material 1 is pushed back in the direction in which it was struck and is struck again by the jet air 10. In this way, the spray material 1, which has become sufficiently atomized while passing through the turbulent area of the convergence section 14, is evenly dispersed in the airflow. Then, it is carried by the convergent airflow 13 to the spray target surface 15 . The converging airflow 13 has strong directivity and collides with the surface to be sprayed while encircling surrounding air 22.

Therefore, the atomized spray material 1 will not fall off from the convergent airflow] 3, and generation of ineffective mist can be prevented. As shown in FIG. 1, the pattern Q formed by IJ by spraying has a substantially circular shape.

The outlet 11 of the supply pipe 5 can also be modified as shown in FIG. In this case, the outlet 11 is formed in the shape of a vertically long slit, so that the spray material 1 can be distributed and supplied to the jet air 10 in the vertical direction. The spray pattern Q in this case also has the same shape as that in FIG.

Further, the outlet 11 of the supply pipe 5 can be changed to open through the surface wall of the air nozzle 3.

Furthermore, the spray material 1 can also be supplied using gravity, and does not necessarily need to be supplied under pressure.

Further, there is no need to use the supply pipe 5 to supply.

(g) Second to Fourth Embodiments FIGS. 5 to 8 show second to fourth embodiments of the present invention, in particular, the spray pattern Q1 is formed into an oblong or elliptical flat shape. It is designed so that it can be formed into

In this case, as in the first embodiment, the jet air direction from the nozzle port 7 is determined by the thickness center line A1 of the jet air 10, which is the spray center axis P.
Orient it so that it converges towards.

Furthermore, as shown in FIG. 5, both jet airs 10 are oriented such that their widthwise center lines A2 are inclined in opposite directions with respect to the spray center axis P. As a result, most of the jet air 10 in the width direction intersects in a V-shape and converges, forming air regions 13a above and below the convergent airflow 13 that do not converge.

In order to reduce air consumption when the width direction center line A2 is inclined, the left and right small hole groups 9a and 9b are arranged vertically shifted as shown in FIGS. 68 to 6C. Specifically, the small hole group 9a on the left side in the figure is slightly biased upward with respect to the spray center axis P, and the small hole group 9a on the right side
On the contrary, b is biased downward.

When spraying is performed using the Shishita spraying device as described above, an oval spray pattern Q1 as shown in FIG. 5 is obtained. The short axis length of this spray pattern Q1 is approximately the same diameter as the spray pattern Q according to the first embodiment, and the long axis length is approximately 3
Double. This means that the same amount of spray material 1 is dispersed over a wider area. By the way, the long axis of the spray pattern Q1 is at an angle α with respect to the vertical central axis H of the spray device.
It's tilted. This seems to be because the width direction center line A2 of the jet air 100 has an inclination, and the airflow after crossing is twisted in one direction.

The nozzle opening 7 can be changed into a vertically long slit shape as shown in the third and fourth embodiments of FIGS. 7 and 8. At this time, the air chamber 22 inside the nozzle 3 is
As shown in FIGS. 7B and 8B, when the nozzle openings 7a and 7b are installed at an angle, the jet air 138.13a formed by the nozzle ports 7a and 7b has the same directionality as the jet air of the second embodiment. can be set. In this way, by using the slit-shaped nozzle ports 7a and 7b, a large amount of nozzle air can be supplied, and it can be applied to ultra-large machines. still,
As shown in the figure, the third embodiment shown in Figs. 7A-B uses a pair of nozzles 3.3 in combination;
In the fourth embodiment shown in the figure, one nozzle 3 has a pair of nozzle ports 7a.
, 7b are provided.

(H) Fifth Embodiment FIGS. 9 and 10 show a fifth embodiment of the present invention.

This is characterized in that jet air 10 is ejected from a nozzle opening 7 having a circular opening, and a chamber 12 is formed into a cone shape. Specifically, a nozzle block 19 having a tapered peripheral wall 18 at the front end of the body 17 of the spray device, and a cap 20 covering the outer surface of the peripheral wall 18.
Attach the nozzle block 19 and cap 20 respectively.
and form a circular nozzle opening 7. Compressed air is supplied to the nozzle port 7 through a passage 2 formed in the body 17 and a donut-shaped air chamber 22.

The sprayed material 1 is guided to the convergence part 14 by the weak wind derived from the jet air 10, but in addition to this, a hole 23 communicating with the air chamber 22 via the passage 14 is opened in the chamber 12 to guide the sprayed material. 1 may be pushed out in the direction of the convergence part 14.

In the air nozzle 3 of this embodiment, since the jet air 10 is blown out so as to converge into a cone shape, the convergent airflow 13
directionality can be made stronger. Although not shown, the spray pattern is circular.

(S) Sixth Embodiment FIGS. 11 to 13 show an embodiment in which the present invention is applied to a spray gun for painting.

In FIG. 11, the spray gun includes a body 30, an air valve 31 and a paint valve 32 built into the body, and a trigger 33 for opening and operating both valves 31 and 32.
It is comprised of an air nozzle 3 attached to the front end of a body 30, a supply pipe 5, and the like.

The air valve 31 includes a valve case 34, a plug body 36 for opening and closing a valve port 35 provided in the case 34, and a plug body 3.
It is comprised of a valve spring 37 and the like that biases the grip 6 into the closed position, and is disposed above the grip 40. When the trigger 33 is squeezed, the plug body 36 retreats against the valve spring 37, and the plug body 36
A gap is formed between the valve case 34 and the valve case 34. Compressed air enters through this gap, leading to the valve port 35 and air passage 38.
The air flows into the nozzle 3 through the air. The air nozzle 3 and the air passage 38 communicate with each other via a joint 39.

49 is a compressed air inlet passage.

The paint valve 32 is provided in front of the trigger 33, and includes a valve seat 43 attached to the front end of the valve chamber 42-, a valve stem 44 that opens and closes by coming into contact with and away from the valve seat 43, and the entire valve stem 44. The valve seat 4
The pressing toward the direction 3 is constituted by a valve spring 45, etc., which urges the valve spring 45. The valve stem 44 includes a valve body 46 and a rod 4 that passes longitudinally through the plug body 36.
7 and an interlocking piece 48 that receives one end of a valve spring 45, and is opened by a trigger 33 via a stopper 36.

Specifically, the valve body 46 is configured to separate from the valve seat 43 after the plug body 36 is opened and compressed air is blown out from the air nozzle 3 . To obtain this operation delay,
A small gap is provided between the plug body 36 and the interlocking piece 48. 50 is a paint inlet passage. The paint is stored in a separate tank, and is fed into the inlet passage 50 by the action of gravity or by the pressure action of compressed air acting within the tank.

The air nozzle 3 has a thickness center line A1 and a width direction center line A2 that are inclined in the same way as the air nozzle 3 of the second embodiment with respect to a pair of jet air 10 ejected from a nozzle port 7 consisting of a group of small holes. The difference is that compressed air is introduced from the upper part of the back of the air nozzle 3.

The supply pipe 5 is screwed and fixed to the valve seat 43 so as to pass through the air nozzle 3 back and forth. Therefore, if a plurality of supply pipes 5 with different diameters of the outlet 11 are prepared, the supply pipes 5 can be easily replaced depending on, for example, the viscosity of the paint.

(v) Another Embodiment The nozzle opening 7 may be opened not only in a straight line but also in a gentle arc. Further, in the case where a pair of nozzle ports 7 is provided, each nozzle port 7 may be arranged vertically in parallel. Furthermore, it is also possible to modify the jet air 10 to be ejected from three or more nozzle ports 7.

(l) As described in detail of the invention, in the spraying device of the present invention, the air nozzle 3 blows out planar jet air 10, and the jet air 10 is converged toward the central axis P of the spray, and the inside of the jet air 10 is A chamber 12 was partitioned into the chamber 12, and the atomizing material 1 was supplied into the chamber 12 in a non-atomized state to perform atomization. Further, the converged jet air 10 forms a convergent airflow 13 to convey the atomized spray material 1 to the spray target surface 15.

Therefore, according to the spraying device of the present invention, the spraying material 1 can be atomized without using a spraying nozzle, so that the problem of clogging of the nozzle, which was unavoidable in conventional devices, can be avoided. This makes it possible to eliminate various problems caused by clogging, facilitate its handling, and at the same time simplify management work. Also, there is no need to worry about clogging, so
Even highly viscous paints, adhesives, and powders can be reliably atomized.

Further, even if a blasting material is used as the spraying material 1, since the blasting material is supplied in a non-sprayed form, wear of the supply section 11 can be prevented.

Atomization is performed by final atomization in the convergence section 14 of the converging jet air 10, and the atomized atomized material 1 is directed to the spray target surface 15 by the convergence airflow 13 that forms an orderly flow. Since the spray material 1 is carried, it is advantageous in that generation of ineffective mist can be prevented, contamination of the working environment by the spray material 1, solvent, etc. can be prevented, and wasteful consumption of the spray material 1 can be prevented.

As already mentioned in this book, in this invention device, the air nozzle 3
The spray material 1 is atomized by the flow action of the jet air 10 ejected from the spray material 1, and in particular, the spray material 1 is supplied in a non-atomized state. Therefore, compared to conventional devices that perform atomization using highly precisely machined spray nozzles, air caps, etc., the spray mechanism can be extremely simplified and the spray device can be manufactured at low cost.

In general, there is no fear of clogging or abrasion of the atomizing material supply means, and the atomization principle is simple, so atomization can be performed without any instability factors.

For example, even when the spray material 1 is stuck in the supply section 11, atomization can be performed reliably and stably, and operational reliability of the spray device can be improved.

[Brief explanation of drawings]

Figures 1 to 4 show the first part of the spraying device according to the present invention.
An example is shown. Fig. 1 is a diagram explaining the principle of the spray device, Fig. 2 is a front view of the air nozzle, Fig. 3 is a sectional view taken along the line ■-■ in Fig. 2, and Fig. 4 is a change in the supply pipe. It is a side view of a spray device. 5 to 8 show second to fourth embodiments of the spraying device according to the present invention, FIG. 5 is a diagram explaining the principle of the spraying device of the second to fourth embodiment, and FIG. 6A The figure is a front view of the air nozzle of the second embodiment, and FIGS. 6B and 6C are the VIBVIB line of FIG. 6A, respectively.
i> Yohi VI C-VI C sectional view, Figures 7A and 7B are front and side views of the air nozzle of the third embodiment, respectively, and Figures 8A and 8B are the air nozzles of the fourth embodiment, respectively. FIG. 3 is a front view and a side view of a nozzle. FIGS. 9 and 10 show the fifth part of the spraying device according to the present invention.
An example is shown, FIG. 9 is a cross-sectional front view of the air nozzle, and FIG. 10 is a front view of the air nozzle. 11 to 13 show a sixth embodiment in which the present invention is applied to a spray gun for painting, in which FIG. 11 is a vertical side view of the spray gun, FIG. 12 is a front view of the air nozzle, and FIG. The figure is a sectional view taken along the line XI-XI in FIG. 12. 1...Spraying material,...Air nozzle, jet air, 1 Yanba.

Claims (4)

[Claims] (1) Spray material supply means 2 that supplies the spray material 1 in a non-sprayed state
and an air nozzle 3 that sprays jet air 10 to atomize the spray material 1. The air nozzle 3 has a nozzle port 7 that sprays planar jet air 10, and The jetting direction of the nozzle opening 7 is oriented so as to converge toward the central axis P of the spray and form a convergent airflow 13 after convergence, and the supply section 11 of the spray material supplying means 2 is placed in a chamber 12 surrounded by jet air 10. A spray device characterized in that: (2) The spraying device according to claim 1, further comprising a pair of nozzle ports 7 for ejecting planar jet air 10, with the supply section 11 of the spray material supply means 2 interposed therebetween. (3) The spray device according to claim 1, wherein the nozzle opening 7 is formed in an annular shape and the jet air 10 is ejected in a cone shape. (4) A method according to claim 2, wherein the thickness center lines A1 of the pair of jet airs 10 are converged toward the spray center axis P, and the width direction center lines A2 are inclined in opposite directions with respect to the spray center axis P. Spraying device.