JPH0522280Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a spray gun for applying a liquid agent, which can efficiently spray a liquid agent such as a rust preventive agent.

[Conventional technology]

For example, rust is likely to form on the inner surfaces of the front pillars, center pillars, and doors of automobiles, and on the inner surfaces of various appliances and devices that do not have painted surfaces, and especially in places that cannot be seen from the outside. Rust significantly reduces equipment life.

Therefore, in automobiles, etc., rust is prevented by using anti-rust steel plates, etc., but the anti-rust performance deteriorates due to aging in not only welded areas but also other areas. Therefore, it is necessary to apply the rust preventive agent again, and it is important to apply the rust preventive agent evenly and efficiently.

In addition, this rust preventive agent is usually applied on the inside of a door, etc., in a place that is hidden from view.
Drill a hole of about 20 mm and spray the rust preventive agent through the hole.

Conventionally, a spray gun for applying a rust preventive agent used in such cases has a gun body A provided with a nozzle B made of a metal tube with a slightly bent tip, as schematically shown in FIG. On gun body A,
It was connected to a pumping device C for pumping rust preventive agent.

Therefore, since the conventional device shown in FIG. 10 is made of a metal tube, it is difficult to spray into intricate locations.

In addition, the present applicant applied for a spray gun in 1983 that made it easy to apply rust preventive to complicated places by attaching a nozzle fitting to the tip of a flexible tube.
It was proposed in the specification and drawings attached to No. 179621. However, in this spray gun, as shown in Fig. 11, an air nozzle D for discharging air is provided in the gun body A, so that the rust preventive agent is atomized in the gun body A and then flows through the flexible tube E. There was a problem in that the discharge amount of the rust preventive agent was reduced due to the back pressure caused by the resistance between the tubes and the rust preventive agent tended to liquefy inside the flexible tube E. Note that as the inner diameter of the through hole to be inserted decreases and the distance from the through hole to the spraying location increases, the diameter of the flexible tube E decreases and the length increases, the back pressure increases. do.

This invention involves attaching the inner tube and outer tube to the gun body.
The purpose of the present invention is to provide a spray gun for applying liquids that can solve the above-mentioned problems and can efficiently spray liquids such as rust preventive agents, based on a double pipe structure and the ability to atomize rust preventive agents at the tip. There is.

[Means for solving problems]

Hereinafter, one embodiment of the means of the present invention that can achieve the above-mentioned objects and solve the problems will be described with reference to the drawings.

In the figure, a spray gun 1 for applying a liquid agent is inserted into a distal end 5 of a gun body 2 where an air flow path 3 and a liquid agent flow path 4 are opened, and an inner tube 6 that communicates with the air flow path 3 and an outer tube inserted into the inner tube 6. A gap 9 between the outer tube 7 and the outer tube 7 which communicates with the liquid agent flow path 4 is attached to each rear end, and a nozzle fitting 11 is provided at the tip of the outer tube 7 to form a base portion 13. There is a space G1 between the tip and the rear end of the nozzle fitting 11.
An air nozzle 14 is installed across the air.

In this example, the gun body 2 has a pistol shape with a handle 22 disposed at the rear end of the body 21, and has a body 21,
The handle 22 is provided with the air flow path 3 in which an on-off valve 24 and a metering valve 25 are interposed.

Note that the air flow path 3 is connected to the nipple 2 at the lower end of the handle 22.
A guide hole 29 extending from 7, a side hole 30, and an oblique hole 31
and a guide hole 32 extending through the center of the body 21,
Further, the on-off valve 24 is interposed in the side hole 30, and the on-off valve 24 is provided with a valve rod 35 that opens a valve seat 34 when a trigger 33 is pulled.

In addition, in the metering valve 25, the valve body 37, which approaches and moves away from the step 36 of the guide hole 32, is screwed into a nut fitting 39 at the rear end, so that air is The air passing through the flow path 3 can be regulated.

Further, the air flow path 3 extends from the guide hole 32 to the body portion 21.
A large diameter hole 41 that opens at the tip and is relatively long.
through the small hole 42, and the small hole 42
An inner nozzle fitting 45 having an inner discharge port communicating with the small hole 42 and having a tapered nose portion 44 projecting into the hole 41 is screwed onto the front surface of the inner nozzle fitting 45 .

Further, in the body portion 21, a vertical hole 46 communicating with the hole portion 41 is bored in the downward protrusion of the tip portion 5.
A cap body 48 provided with an internal thread is attached using a hollow nut 43 that is screwed into the vertical hole 46, and a vertical hole 46 that hangs downwardly is inserted into the internal hole of the hollow nut 43.
A suction pipe 47 that leads to is screwed concentrically. Note that the cap body 48 is prevented from rotating by a retaining pin.

A liquid agent supply tool 16, which is a can in this example and stores a rust preventive agent through which the suction pipe 47 passes, is attached to the cap body 48 using the internal thread.
In this example, a commercially available can containing a rust preventive agent is used as the can.

Therefore, the suction pipe 47 has its lower end communicating with the inside of the can, and its upper end communicating with the hole 41 through the inner hole of the hollow nut 43 and the vertical hole 46, thereby forming the liquid agent flow path 4. In addition, the liquid agent flow path 4 is connected to the hole 41.
The inner pipe 6 is connected to the inner nozzle fitting 45 inside.
An opening is formed at the tip 5 of the gun body 2 around the vertical metal fitting 49 at one end.

The coupling fitting 49 has a stepped cylindrical shape with a mounting portion for fitting the inner tube 6 through a step 50 at the tip of the cylindrical portion, and the cylindrical portion has the nose portion 44.
A tapered hole 51 is provided in close contact with the. Also, the other end of the spring 53, which is held at one end by the step 50 and surrounds the inner tube 6, is held by a nut fitting 54 that is screwed into the tip of the hole 41, so that the fitting fitting 49 is attached inward. The inner nozzle metal fitting 45 is in contact with the inner nozzle metal fitting 45.

The nut fitting 54 has a hole 4 at the inner end of the hexagonal part 55.
1, and at its outer end, a somewhat small diameter mounting part 56 into which the outer tube 7 is fitted is formed concentrically through the medium diameter part. In addition, the nut fitting 54 is
An inner hole 5 that opens at the hole 41 and allows the spring 53 to pass through.
7, a small-diameter inner hole 6 into which the inner tube 6 is inserted with a gap through a contact portion 59 that supports the end surface of the spring 53;
0 is formed.

Therefore, the inner tube 6 communicates with the air flow path 3 by the fitting 49 coming into contact with the nose portion 44, and the gap 9 formed between the outer tube 7 and the inner tube 6 is connected to the inner holes 60, 57.
It communicates with the liquid agent flow path 4 through the passageway.

The inner tube 6 and the outer tube 7 are hoses made of a bendable flexible material such as synthetic resin or rubber, and the outer tube 7 has a base portion 13 to which the nozzle fitting 11 is attached at the tip. An air nozzle 14 housed in a base portion 13 is attached to the tip of the inner tube 6.

As schematically shown in FIG. 2, the nozzle fitting 11 is
In this example, at the rear end of a relatively long cylindrical body 61 having a center hole 17, protrusions with a serrated cross section are provided in multiple stages to provide an attachment portion for the outer tube 7. By attaching the outer tube 7, the nozzle fitting 11
The tip portion of the outer tube 7 forms a base portion 13.

Further, a discharge port 18 is formed in the body portion 61 . In this example, the discharge port 18 is located at the front wall 62 of the body portion 61.
A discharge port 19 is provided before being provided in the front end portion, and a blowout port 2 is provided in the distal end portion in the circumferential direction of the body portion 61.
Consists of 0. The discharge port 19 is located at the center hole 17.
The front wall 62 has a concave shape with a smaller diameter than that of the front wall 62, and a recess 62A is formed in the front surface of the front wall 62.
The discharge port 20 on the other side extends the circumferential wall of the body 61 by approximately 120 mm.
It consists of three elongated holes that are cut out at an angle range of 100°, tilted with respect to the central axis and out of phase with each other, and the elongated holes allow the discharge port 2 on the side to extend over the entire circumference of the body 61.
0 is formed.

The air nozzle 14 has a small-diameter mounting portion 65 for mounting the inner tube 6 on a prismatic piece-shaped base 64 whose corner portion touches the inner surface of the outer tube 7, and has an air outlet at its center. A through hole 15 is provided to form an outlet at the front end. In this example, the air nozzle 14 has its tip located at the tip of the outer tube 7 of the base portion 13 with a space G1 between it and the rear end of the nozzle fitting 11, and therefore, The air outlet faces the center hole 17 via the space G1. The air nozzle 14 also has a base 6
By the corner portion of 4 being in contact with the inner surface of the outer tube 7,
The outer circumferential surface of the base 64 forms a flow path G2 that opens in the space G1 between the outer circumferential surface and the inner surface of the outer tube 7. Further, by separating the air nozzle 14 and the nozzle fitting 11 with a space G1, the liquid agent passing through the gap 9 between the inner tube 6 and the outer tube 7 can flow into the space G1 together with high-speed air.

[Effect]

The nipple 27 is connected to a high-pressure air source (not shown) such as a compressor through a hose, and the can, which is the liquid supply device 16, is screwed onto the cap body 48 as described above, and the suction 47 is connected to the nipple 27 via a hose. hang inside.

By operating the trigger 33 and opening the on-off valve 24, high-pressure air from the high-pressure air source passes through the air flow path 3, passes through the inner nozzle fitting 45, the fitting fitting 49, and the inner pipe 6, and then enters the air nozzle 14. From the air discharge port at the tip of the conduction hole 15 to the center hole 17 of the nozzle fitting 11
The liquid is discharged into the space G1. In addition, the high-speed flow of the discharged air generates negative pressure, passes from the liquid supply device 16 through the suction pipe 47 and the liquid flow path 4, and flows through the gap 9 between the inner pipe 6 and the outer pipe 7. Aspirate the liquid. Further, the liquid agent is atomized by the high-speed air flow, and the mixed flow can be ejected from the front outlet 19 and the side outlet 20. Therefore, the liquid agent can be ejected not only in front of the nozzle fitting 11 but also to the sides, almost all around the circumference thereof.

In addition, the high-pressure air is discharged by the air nozzle 14 at the tip, and the liquid can be atomized while being sucked in at the tip, which improves the suction power of the liquid, and it can be discharged while maintaining the atomized state by mixing at the tip. Increase coating efficiency. In addition, as the suction force increases, the outer diameter of the outer tube 7 can be reduced, and the nozzle fitting 11 can be reduced.
By making the diameter smaller, it becomes easier to insert it into a relatively small through hole provided in an automobile door or the like. Furthermore, since the inner tube 6 and the outer tube 7 have flexibility, they can be easily inserted into complicated places.

Note that FIGS. 3 to 9 show other examples of the nozzle fitting of the present invention. The one shown in FIG. 3 shows the case where the discharge port 20 is provided on the entire circumference of the body 61 by providing semicircular elongated holes at the top and bottom, and the one shown in FIG. By arranging them in parallel in the circumferential direction, the discharge ports 20 are provided along the entire circumference of the body portion 61. In addition, in FIG. 5, a single spiral elongated hole is provided with a discharge port 20 extending all around the circumference, and a sixth
In the figure, inner holes are arranged side by side at an angle pitch of about 90 degrees to form a discharge port 20 on the side extending in the circumferential direction.

Further, FIG. 7 shows a case where only the front discharge port 19 is provided, and FIG. 8 shows a case where the front end of the body 61 is deformed to be narrow in order to flatten the front discharge port 19. Further, FIG. 9 shows a nozzle fitting 11 that is bent into an L-shape.

[Effect of idea]

As described above, the spray gun for applying liquids of the present invention has a flexible inner tube in the gun body that communicates with the air flow path, and a flexible outer tube that communicates with the liquid flow path between the inner tube and the inner tube. An air nozzle is attached to the tip of the inner tube, with a space between the nozzle fitting attached to the tip of the outer tube, and a through hole for discharging air. Therefore, by discharging high-pressure air from the air nozzle at the tip of the inner tube, the liquid agent can be sucked and mixed at the tip and discharged from the nozzle fitting. Therefore, unlike a spray gun schematically shown in FIG. 11, which mixes the air flow and the liquid at its base, the spray gun can be discharged in an atomized state, increasing the efficiency of applying the liquid. In addition, unlike conventional devices, there is no back pressure generated within the flexible tube E, making it easier to suck out the liquid and increasing coating efficiency.
It also helps reduce the diameter of the outer tube, making it easier to insert into small-diameter through holes, and combined with the flexibility of the inner and outer tubes, it is easy to blow into intricate or narrow spaces. It can have many effects, such as being easier to attach.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing one embodiment of the present invention;
The figure is a perspective view schematically showing the nozzle fittings and air nozzle.
3 to 6 are front views showing other examples of nozzle fittings,
FIG. 7 is a sectional view showing still another example of the nozzle fitting, FIGS. 8 and 9 are front views showing other examples of the nozzle fitting, FIG. 10 is a diagram illustrating a conventional gun, and FIG.
FIG. 1 is a front view showing a part of another conventional example. 2... Gun body, 3... Air channel, 4... Liquid agent channel, 5... Tip, 6... Inner tube, 7... Outer tube,
9... Gap, 11... Nozzle fitting, 13... Base part, 14... Air nozzle, 15... Conduction hole, 1
6...Liquid supply tool, 17...Center hole, 18...Discharge port.

Claims (1)

[Scope of utility model registration request] At the tip of the gun body, where the air flow path leading to the high-pressure air source and the fluid flow path leading to the fluid supply device open,
a rear end of a flexible inner tube that communicates with the air flow path; a rear end of a flexible outer tube that is externally inserted into the inner tube and has a gap between the inner tube and the inner tube that communicates with the liquid flow path; At the same time, a nozzle fitting having a cylindrical shape with a center hole and a discharge port at the tip is attached to the tip of the outer tube, and a nozzle fitting is attached to the tip of the inner tube between the rear end of the nozzle fitting and the tip of the inner tube. An air nozzle having a conduction hole facing the center hole across a space is installed, and an outer circumferential surface of the air nozzle communicates with the liquid flow path between the inner surface of the outer tube and a flow path opening in the space. A spray gun for applying a liquid agent, which is characterized by forming a channel.