JP2002035648A - Nozzle for coating spray gun and coating spray gun provided with the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To spray a high viscous coating material surely misty. SOLUTION: This nozzle 1 is provided with a 1st nozzle port 11 facing the opening part A11 side of a mixing chamber A1 of a spray gun A, a 2nd nozzle port 12 facing the outside direction of the spray gun A and a stirring chamber 13 positioned between both nozzles and for stirring and mixing the coating material sprayed from the 1st nozzle port 11 with air and the spray gun A is provided with the nozzle 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a nozzle of a spray gun for spraying a paint used for painting the outer wall of a building and a spray gun having the nozzle, and more particularly, to a spray gun having a high viscosity. And a spray gun provided with the nozzle.

[0002]

2. Description of the Related Art A spray gun for coating mixes paint fed by a pump with air in a mixing chamber, and sprays mist-like paint from a nozzle having a small-diameter hole nozzle by the pressure of compressed air mixed with the paint. It is a structure to do.

[0003]

In the outer wall coating of a building, it is necessary to coat a wide area evenly and to have a uniform thickness in order to maintain its aesthetic appearance and the function of protecting the skeleton. Requires extremely high coating techniques. For example, paint dripping is one of the causes of this unevenness and uneven thickness of the paint.The paint is applied with a spray gun to prevent this dripping, but technically the paint thickness is such that the paint does not drool. Apply the top coat in several layers. However, in a word, although it is said that the paint is applied with a coating thickness that does not cause dripping of the paint, this coating technique can not be performed overnight, and the work time may be increased because multiple layers of overcoats are overlaid. .

[0004] The cause of the above-mentioned dripping of the paint is greatly affected by the viscosity of the paint. It has been found that the lower the viscosity of the paint, the more the mist is formed. Therefore, it is conceivable to use a high-viscosity paint.However, when a high-viscosity paint is used, due to the structure of the nozzle in the spray gun, part of the sprayed paint does not become mist and large particles of the paint are sprayed. As a result, unevenness of coating and uneven thickness occur, so that it cannot be practically used. This is considered to be due to the fact that the viscosity of the paint is so high that the mixing of the paint and the air is incomplete, so that the paint is clogged at the nozzle opening and the paint is ejected as a lump by the compressed air. Accordingly, an object of the present invention is to provide a nozzle capable of spraying a high-viscosity paint in a reliable mist state and a spray gun having the nozzle.

[0005]

The technical means adopted by the present invention to achieve the above object is a nozzle 1 to be mounted on a spray gun for coating. A1 facing the opening A11 side of A1
A nozzle port 11, a second nozzle port 12 facing the first nozzle port 11 and facing the outward direction of the spray gun A, and is located between these two nozzle ports, and is sprayed from the first nozzle port 11. It has a stirring chamber 13 for stirring and mixing the paint with air. (Claim 1) The nozzle 1 of the invention of claim 1 has a first nozzle port 1 when mounted on a spray gun A as shown in FIGS.
1 is fixed so as to close the opening A11 of the mixing chamber A1. In the nozzle 1 thus configured, the paint (primary mixture) mixed with the air in the mixing chamber A1 is sprayed from the first nozzle port 11 into the stirring chamber 13. (Primary spraying) At this time, the paint sprayed into the stirring chamber 13 has a completely mixed portion completely mixed with air and a portion not partially mixed. The unmixed portion is stirred and mixed together with the completely mixed portion and the air in the stirring chamber 13 by the pressure of the compressed air to be in a completely mixed state, and here, all of the paint is in a completely mixed state. (Secondary mixing) The paint completely mixed with the air in the stirring chamber 13 is sprayed into fine mist from the second nozzle port 32 by compressed air. (Secondary Spray) That is, the nozzle of the present invention uses the primary spray at the first nozzle port 11 and the secondary mixing in the stirring chamber 13 to mix the paint mixed with air in the mixing chamber of the spray gun with air. Since it is in a completely mixed state, a high-viscosity paint can be reliably sprayed in a fine mist state.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The nozzle 1 according to the present invention has a structure suitable for spraying a high-viscosity paint as described above. However, even when a low-viscosity paint is used, a conventional nozzle can be used. A finer and more reliable mist-like paint can be sprayed as compared with a thing. The term “viscosity of paint” as used herein means that the viscosity of a paint used in a conventional spray gun is around 70 seconds. Therefore, a viscosity less than this viscosity is called a low viscosity, and a viscosity exceeding this viscosity is called a high viscosity. The unit of the viscosity is a time when a certain amount of paint is put into a lightweight cup called Iwata cup and the temperature of the paint is 20 ° C., and the paint falls from the outlet of the lightweight cup.

The first nozzle port 11 and the second nozzle port 1
The shape of the nozzle 2 may be a perfect circle as in the case of a nozzle of an ordinary spray gun, but in the invention of claim 2, one of the first nozzle 11 and the second nozzle 12 or , Characterized in that both are oval.
According to the second aspect of the present invention, when the first nozzle port 11 is formed into an oval shape, some unmixed paint sprayed from the mixing chamber 1 to the stirring chamber 13 passes through the first nozzle port 11. Sometimes, it spreads forward and along the longitudinal direction of the first nozzle port 11. That is, since the paint is diffused without being concentrated in one direction, the paint easily passes through the first nozzle port 11, and the density is reduced by the diffusion. The paint sprayed into the stirring chamber 13 with a low density is easily stirred with the air, and can be more reliably and quickly mixed with the air. Further, when the second nozzle port 12 is formed in an elliptical shape, the paint to be sprayed has an elliptical shape. Therefore, when the paint is applied along the short direction, the overlapping portion of the paint can be reduced, so that the thickness of the paint is reduced. It is very easy to equalize.
When both nozzle openings are formed in an oblong shape, the nozzle is excellent in a function of mixing paint and air, and can be easily coated with a uniform thickness.

The first nozzle port 11 and the second nozzle port 1
In the case where 2 has an oval shape, the invention of claim 3 is characterized in that both nozzle openings are arranged so as to cross each other. According to the third aspect of the present invention, the paint sprayed in the shape of an ellipse from the first nozzle port 11 is directed toward the second nozzle port 12 via the stirring chamber 13. Since it intersects with the first nozzle port 11, the portion going out of the second nozzle port 12 is caught in a portion that is reversed on the wall around the second nozzle port 12, and becomes turbulent in the stirring chamber 13. And further agitated with air. Therefore, the function of mixing the paint and air is further improved, so that a paint having an extremely high viscosity can be used, and the nozzle 1 capable of spraying in a very fine mist state can be used.
Becomes

According to a fourth aspect of the present invention, there is provided a spray gun for coating provided with the nozzle according to any one of the first to third aspects, wherein the nozzle 1 is provided with a spray gun A for mixing paint and air. The first nozzle port 11 is mounted so as to face the opening A11 of the mixing chamber A1. According to the fourth aspect of the present invention, the mixing function of the paint and the air is improved, and the paint can be surely mixed even if a high-viscosity paint is used, so that the paint can be sprayed in a very fine mist.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows a spray gun A according to the present invention. The spray gun A of the present invention is basically the same as the conventional structure, and therefore will not be described in detail. However, in brief, the spray gun A will be described in brief. A trigger A4 is provided near the corner formed by A3 and the paint valve A51 is opened from the paint hose A5 connected to the front end of the main body A2 to introduce paint into the mixing chamber A1 and pull the trigger A4. Then, compressed air was introduced into the mixing chamber A1 from the air hose A6 connected to the lower end of the grip, and these paints and compressed air were mixed in the mixing chamber A1, and were mixed with air by the force of the continuously introduced compressed air. The paint is sprayed from the nozzle 1 in the form of a mist.

Here, an embodiment of the nozzle 1 which is the gist of the present invention will be described. The nozzle 1 is shown in FIGS. 2 and 3 (A) (B)
As shown in the figure, the first oval having a long oval shape on the left and right
A stirring chamber 13 having two nozzle ports, a nozzle port 11 and a second nozzle port 12 having a long oval shape which is long vertically in the drawing, between which the paint is stirred and mixed with compressed air.
It has.

The nozzle 1 will be described in more detail. The diameter of the opening A11 of the mixing chamber A1 is larger than the inner diameter of the opening A11.
11 is formed in a substantially disk shape having a smaller diameter than the outer diameter thereof, and convex portions 111 and 121 having a first nozzle port 11 and a second nozzle port 12 are formed on the front and rear surfaces thereof. 1st nozzle port 1
The convex portion 111 having an opening 1 has an elliptical shape in the longitudinal direction in the same direction as the first nozzle port 11, and the convex portion 121 having an opening in the second nozzle port 12 has a longitudinal direction in the second nozzle port 12. It is an oval shape in the same direction as. These convex portions 111 and 121 are
The stirring chamber 13 is formed by depressing the inner surface of the stirring chamber 13 in the left-right direction in a side view in the drawing and in an arc shape in a side view. Both the first nozzle port 11 and the second nozzle port 12 opened to the projections 111 and 121 are formed at the center of the projections 111 and 121 so as to expand in the longitudinal direction from the center of the base of the projection. I have. With this configuration, the first nozzle port 1
The first and second nozzle openings 12 cross in a cross shape as shown in the figure. The stirring chamber 13 is provided between the first nozzle port 11 and the second nozzle port 11.
Front circular space 13 secured between nozzle ports 12
1 and concave portions 132 and 133 formed to form the convex portions 111 and 121. In the space 131, the left and right surfaces in FIG.
31 and 132 are formed by inclined surfaces 134 and 135 expanding toward both peripheral edges.
The right slope is greater than the left slope.

The nozzle 1 is screwed into the end of the opening A11 of the mixing chamber A1 and the outer periphery of the opening A11 with the first nozzle port 11 facing the mixing chamber A1 of the spray gun A. It is mounted on the spray gun A while being held between the fitting A12. In this embodiment, the mixing chamber A1
Is wider than the conventional mixing chamber, thereby improving the mixing efficiency of the paint and the air.

Next, a spray gun A equipped with the nozzle 1
The spraying state of the paint by the method will be described. First, paint valve A
51 is opened to introduce the paint into the mixing chamber A1, and at the same time, the trigger A4 is pulled to introduce compressed air into the mixing chamber A1.
Then, the paint and the compressed air are mixed (primary mixing) in the mixing chamber A1, and the mixed paint is sprayed (primary spray) from the first nozzle port 11 to the stirring chamber 13 by the force of the compressed air. In this primary mixing, a granular paint that is not partially mixed is generated, but the granular paint is the first paint.
When passing through the nozzle port 11, it is diffused forward and in the longitudinal direction of the first nozzle port 11, and its density is reduced so that it can pass smoothly.

First, the completely mixed portion sprayed into the stirring chamber 13 and the granular coating material having a reduced density reach the space 131 while slightly spreading in an oval shape along the arc surface of the concave portion 132 and reach the second nozzle. It is sprayed toward the mouth 12.
The paint sprayed into the space 131 has the second nozzle port 12,
The recess 133 faces the inclined surface 135. At this time, the recess 1
33, the paint toward the inclined surface 135 is reflected on the arc surface of the concave portion 133 and the inclined surface 135, and the paint reflected on the inclined surface 134 is reflected on the opposite inclined surface 133. The reflection of the paint causes a turbulence in the stirring chamber 13, and the paint and the air are sufficiently stirred and mixed by the turbulence.
The paint reflected on the arcuate surface and the inclined surfaces 135 and 134 of the recess 133 entrains the paint toward the second nozzle port 12 at the time of the agitation, and simultaneously agitates and mixes the entrained paint with the air by the agitation force. Thereby, the paint in the entire stirring chamber 13 is completely mixed with the air. (Secondary Mixing) The completely mixed paint is sprayed from the second nozzle port 12 into a fine mist and an elliptical shape by the continuously introduced compressed air.

That is, the spray gun A of this embodiment is
The paint and air are completely mixed by stirring and mixing twice. In particular, the turbulence generated at the time of secondary mixing stirs and mixes the paint that is not partially mixed with the air together with the air, so that the paint can be reliably sprayed in the form of a mist.

In this embodiment, the mixing chamber A1 of the spray gun A is described as being wider than the conventional mixing chamber. However, the present invention is not limited to this. Also in the chamber, by installing the nozzle 1 described above, two times of stirring and mixing and two times of spraying can be performed, so that it is possible to spray in a reliable mist state. For example,
What is necessary is just to prepare a nozzle having an outer diameter corresponding to the opening of the mixing chamber of the conventional spray gun and replace it with the nozzle mounted on the conventional spray gun. Further, in the nozzle 1 exemplified in the present embodiment, the first nozzle port 11 and the second nozzle port 12 are formed into an oblong shape, and furthermore, both nozzle ports are arranged to cross each other. The present invention is not limited to this, and includes a case where both nozzle openings are formed in a perfect circular shape or a combination of a perfect circular shape and an oblong shape, and the arrangement form is arbitrary. In the present embodiment, the most suitable nozzle structure has been exemplified among the nozzle structures that can be configured in various structures.

[0018]

As described above, according to the present invention, the paint mixed with air in the mixing chamber of the spray gun is completely mixed with air by the primary spray at the first nozzle port and the secondary mixing in the stirring chamber. Since it is in the state, it is possible to provide a nozzle and a spray gun capable of reliably spraying a high-viscosity paint in a fine mist state. And in the invention of claim 2,
When the first nozzle port has an oval shape, the function of stirring and mixing the paint and air is improved, and when the second nozzle port has an oval shape, it is extremely easy to make the coating thickness uniform.
When both nozzle openings are formed in an elliptical shape, the function of mixing the paint and the air is excellent, and the coating can be easily performed with a uniform thickness. According to the third aspect of the present invention, the turbulent air flow in the stirring chamber further improves the mixing function of the paint and the air, so that a paint having an extremely high viscosity can be used and a very fine mist can be sprayed. Therefore, it is possible to provide a nozzle and a spray gun that achieve the above object.

[Brief description of the drawings]

FIG. 1 is a front view of a spray gun.

FIG. 2 is an enlarged sectional view near a nozzle.

FIG. 3A is a front view of a nozzle, and FIG. 3B is a rear view of the nozzle.

[Explanation of symbols]

 1: Nozzle A: Spray gun A1: Mixing chamber A11: Opening 11: First nozzle port 12: Second nozzle port 13: Stirring chamber

Claims (4)

[Claims] 1. A nozzle mounted on a spray gun for painting, comprising: a first nozzle port facing the opening side of a mixing chamber of the spray gun when mounted, and a spray gun opposed to the first nozzle port. A second nozzle port facing the outer side of the nozzle, located between these two nozzle ports,
A nozzle having a stirring chamber for stirring and mixing paint sprayed from a first nozzle port with air. 2. The nozzle according to claim 1, wherein one or both of the first nozzle port and the second nozzle port have an oval shape. 3. The nozzle according to claim 2, wherein the first nozzle port and the second nozzle port have an oval shape, and the nozzle ports are arranged so as to intersect. nozzle. 4. A spray gun for coating, wherein the nozzle according to any one of claims 1 to 3 is:
A spray gun characterized in that a first nozzle port is attached to an opening of a mixing chamber of a spray gun for mixing paint and air with the first nozzle port facing the opening.