JPS6141621B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improved air spray gun, and more particularly to an air spray gun with a built-in mixing device that can internally mix two or more types of fluids and spray paint while preparing a paint.

Spray painting using an air spray gun is widely used as a painting method. The air spray gun is provided with an air circuit connected to a source of compressed air and a paint circuit connected to a source of paint, which open in close proximity at the nozzle.
During painting, air is ejected from the nozzle through the air circuit, and at the same time as the air is ejected, the paint is guided to the nozzle through the paint circuit and is atomized and sprayed.

By the way, when painting with a two-component paint such as an epoxy resin or urethane resin, the mixed and prepared paint has a pot life, so it is required to mix and prepare only the necessary amount. Conventionally, the mixture was mixed in a container in advance and then supplied to the paint circuit of the air spray gun, but the amount mixed and prepared is almost never the amount necessary and sufficient for painting, and excess or deficiency tends to occur. . If the amount is insufficient, it is necessary to prepare a new mixture, which is not preferable for painting operations, so a large amount is usually prepared. In this case, the unused portion must be discarded, which is also not desirable from the viewpoint of resource conservation and cost. In addition, even when painting continuously over a long period of time, the current practice is to first mix and prepare only the amount that can be used within the pot life, and then prepare a new mixture again for subsequent coatings. be. As described above, painting using a conventional air spray gun cannot achieve both improvement in painting efficiency and reduction in paint loss.

The present invention provides an improved air spray gun that does not have any of the drawbacks of the conventional guns as described above.
A non-driven mixing device is installed in the paint circuit,
The mixing device is characterized by having a plurality of fluid inlets and outlets.

Hereinafter, the present invention will be explained in more detail with reference to the drawings.

FIG. 1 is a representative schematic illustration of an air spray gun according to the invention, in which the gun body 1 is connected by a hose 2 to a source of pressurized air and by hoses 8 and 9 to a source of paint. A check valve 10 is provided at the connection with the hoses 8 and 9 to prevent the paint in the gun from flowing back into the hoses 8 and 9. In the gun according to the invention, a non-driven mixing device 11 is provided in the paint circuit. This mixing device 11 consists of a flow path having a three-dimensional zigzag path, and a plurality of fluids are completely mixed and homogenized while being pumped through the inside.

The non-driven mixing device will be explained below. The mixing device explained here as an example has two end plates each having an inlet port and a discharge port, and alternately connects both ends of several flow grooves of appropriate length provided on each end plate. By intervening and integrally connecting an intermediate plate in which several communicating through holes of appropriate length are drilled concentrically to form a zigzag-shaped passage between both end plates, the inlet can be fed from the inlet. The purpose of this system is to automatically repeat subdivision and merging while flowing fluids to completely mix them, and to easily and reliably mix paints and other fluids.

2 to 10 are schematic explanatory diagrams for explaining this specific example. Reference numeral 16 denotes an end plate provided with an inlet 17, and its inner surface has several circulation grooves 18 of appropriate length radially, and one side of the inlet 17 protrudes in the same circumference as the inner end of the circulation groove 18. A feeding groove 19 is provided. Reference numeral 20 denotes an end plate provided with a discharge groove 21, and several circulation grooves 22 of appropriate lengths are radially provided on its inner surface. Reference numeral 23 denotes an intermediate plate having an appropriate thickness, and includes several through holes 24 passing through the intermediate plate 23 on the same circumferential line as the inner ends of the circulation grooves 18 and 22 of the end plates 16 and 20, and a circulation groove. Several through holes 25 are bored through the intermediate plate 23 on the same circumferential line with the outer ends of the grooves 18 and 22 and have a length equal to the distance between the adjacent flow grooves 18 and 18 or 22 and 22, respectively. ing. Therefore, these two end plates 16 and 2
When the intermediate plate 23 between 0 and 0 is interposed and integrally connected, as shown in FIG.
1 means feeding groove 19, through hole 24, circulation groove 22, through hole 25, circulation groove 18, through hole 24, circulation groove 22
The fluid that enters from the inlet 17 is repeatedly circulated and flows in a zigzag pattern, and then is discharged into the discharge groove 21 .

In this case, as shown in FIGS. 6 and 7, two or more distribution grooves and through holes are formed by inserting one or more appropriate partition plates 26 into each distribution groove and each through hole, or any of them. Figures 6 and 7 show a case in which a single partition plate divides the flow channel into two grooves and two through holes. It is possible to improve the mixing ratio of the fluid by dividing it into each flow path. In addition, the partition plate 26 may be inserted only into the circulation grooves 18 and 22 of the end plates 16 and 20 without inserting the partition plate into the through holes 24 and 25 of the intermediate plate 23, or vice versa. It is also free to fit into the hole, and it is also free to select the intersecting angle between each flow groove end and the through hole to be any angle. Furthermore, in the above case, the combination of two end plates 16, 20 and one intermediate plate 23 and the through hole 2 of the intermediate plate
4 and 25 are formed into a double annular shape by circular arcs of a certain length on the circumferential line of the same center. It is also possible to form a zigzag-shaped flow path, and as shown in FIG. 20 to extend the length of the zigzag flow path and increase the mixing effect of the fluid. In addition, 2
9 is a through hole for a spray gun needle valve.

The length, thickness, route arrangement, etc. of the flow passages in the mixing device can be changed as appropriate depending on the viscosity of the paint, ease of mixing, etc. Mixing device 11 as shown in FIG.
Two or more fluid inlet ports are provided, and the fluid introduced from the outside through the hoses 8, 9, etc., joins together for the first time at the inlet of the mixing device 11. Further, the mixing ratio can also be controlled by providing an inlet fluid amount adjusting means at each inlet.

Since the gun of the present invention has the above-mentioned structure, during painting, each fluid inlet is connected to a pressure-feeding tank and a metering pump for the desired paint component fluid through hoses, and all component fluids are mixed in the gun. While it can be spray painted. Various component fluids can be used as required. That is, in the case of painting with a two-component paint, two parts of the paint
Each component of the liquid may be introduced from a separate inlet. It is also possible to spray paint while diluting the paint by feeding paint through one feed port and thinner from another feed port. Furthermore, it is also possible to spray paint while feeding different colors of paint from each inlet and adjusting the colors within the mixing device.

According to the gun of the present invention as described above, the required amount of spray paint is prepared by mixing the respective component fluids at the time of coating. After painting is completed, each component fluid in the hose can be returned to the tank by removing the hose from the inlet, so that there is no problem in mixing and preparing the spray paint. On the other hand, if the paint hose is removed and a thinner cleaning circuit is connected to the check valve 10, the paint circuit inside the gun can be cleaned. Therefore, the gun of the present invention is extremely superior in that it does not require any effort to adjust the paint color, can be used with two-component paint regardless of its pot life, has good painting efficiency, and does not cause paint loss. It is possible to realize a coating with a high quality.

It goes without saying that the gun of the present invention can function in the same manner as a conventional spray gun by using only one of the plurality of inlets and closing the others.

[Brief explanation of the drawing]

FIG. 1 is a schematic explanatory diagram of the air spray gun of the present invention, and FIGS. 2 to 10 are schematic explanatory diagrams of a non-driven mixing device. 1: Gun body, 2: Air hose, 3: Air amount adjustment knob, 4: Air valve, 5: Paint adjustment knob, 6: Paint opening/closing trigger, 7: Needle valve, 7':
Gasket, 8, 9: Paint hose, 10: Check valve, 11: Non-driven mixing device, 12, 13: Paint seal ring, 14: Paint nozzle, 15: Air cap, 16, 20: End plate, 17: Feed entrance, 1
8, 22: circulation groove, 19: feed groove, 21: discharge groove, 23, 28: intermediate plate, 24, 25, 27: through hole, 26: partition plate, 29: needle valve through hole.

Claims (1)

[Claims] 1. A mixing device in an air spray gun, characterized in that a non-driven mixing device is provided in the paint circuit, and the mixing device has a plurality of fluid inlets and outlets. Built-in air spray gun. 2 The non-drive mixing device alternately connects both ends of several flow grooves of appropriate length provided on each end plate between two end plates each having an inlet and an outlet for the fluid. This method is characterized by intervening an intermediate plate in which several through holes of appropriate length are concentrically drilled, and connecting the intermediate plates integrally to form a zigzag flow path between both end plates. , an air spray gun with a built-in mixing device according to claim 1.