JPS63100963A - Compressor built-in spray gun - Google Patents

Abstract

PURPOSE:To provide an inexpensive spray gun excellent in a uniform coating property, by mounting a battery in the spray gun and utilizing compressed air sucked by the rotating of a motor to spray paint. CONSTITUTION:A motor 2 is started by the power of a battery 8. After the rotatory power of the motor 2 is reduced by a speed reducer 3, a cam 4 is rotated by larger torque and compressed air is obtained by the sucking compression operation of an air compressing member 5 and guided to a spray nozzle 7 from an exhaust valve 62 by piping. A gas nozzle 71 has an orifice at the leading end part thereof and the compressed air enhanced in the flow speed at said orifice sucks up the liquid in a liquid receiving tank 10 by siphon action to atomize the same from a liquid nozzle 72. By operating a spray amount control needle 73, a fine blow-off width of about 5-50mm is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a spray gun with a built-in compressor for applying liquids using compressed air. More specifically, a small compressor consisting of a motor, air compression member, battery, etc., and an application section consisting of a spray nozzle, liquid storage tank, etc. are housed together in a casing, making it suitable for coating small areas. This relates to a portable spray gun with a built-in compressor.

Conventional technology Pressure sources such as compressed air or gas that have been used in spray guns so far have either been compressed air from a large compressor driven by an AC power source through a hose, or fluorocarbon gas, dimethyl ether LP gas, etc. There have been two main methods in which a cylinder such as the above is installed in a spray gun and high pressure gas from the cylinder is used.

Furthermore, regarding an integrated sprayer that houses a motor, battery, etc. inside the casing, Japanese Utility Model Publication No. 58-11387.
Utility Model Publication No. 58-11388 and other proposals have been made, but all of them are airless methods in which the liquid to be sprayed is directly pressurized and atomized by a pump, so the particles of the atomized liquid are relatively large and the main problem is It was used for spraying chemicals, and was not suitable for coatings that required a uniform coating.

Problems to be Solved by the Invention Conventional spray guns, especially two-fluid spray guns that use compressed air or pressurized gas, are either compressors that use AC power as a pressure source, fluorocarbon gas, or dimethyl ether. A cylinder of LP gas, etc. was used.

The former type of compressor uses AC power to generate pressure.

Although the flow rate and pressure source are ideal for spray guns, the latter type of gas cylinder has many problems, such as using an AC power source, making it difficult to use outdoors, and the compressor itself being heavy, large, and expensive. It is small, lightweight, and inexpensive, and can be used outdoors, but the usage time per cylinder is short, and when used continuously, the gas temperature decreases due to the heat of vaporization, worsening the gas vaporization. There were problems such as a drop in pressure and difficulty in spraying.

In addition, integrated sprayers that house a motor, battery, etc. inside the casing mainly use an airless method in which the liquid is pressurized directly by a pump and sprayed. It was relatively large and was mainly used for spraying chemicals, so it was not suitable for painting that required a uniform coating.

The present invention solves the above problems and can be used with simple operation,
The purpose of the present invention is to provide a spray gun with a built-in compressor that is inexpensive and capable of fine atomization suitable for painting.

Means for Solving the Problems The present invention will be described in detail below with reference to embodiments shown in the accompanying drawings.

A casing 1 is made of metal or synthetic resin and has a pistol-shaped shape. A small DC motor 2 with an output of 1W to 80W is installed in the rear part of the casing 1, and a reducer 3 with a reduction ratio of 15:1 to 60:1 is installed on the output shaft 21 side of the motor 2. 3 output shaft 31
The cam 4 fixed to is rotated at 150 to 650 rpm. The cam 4 has a cylinder 51. Piston 52. spring 54
(Fig. 1, Fig. 2), or an actuator 5 of the air compression member 5 consisting of a telescopic bellows-like member (Fig. 3).
3 is slidably abutted or incorporated, and the cam 4
It performs reciprocating motion along with the rotational motion of. Further, the spring 54 becomes unnecessary when the cam 4 is formed into a grooved cam shape. Three or more air compression members 5 are required to prevent pulsating flow of compressed air, and the operation timing of each member is controlled by the cam 4. Further, each air compression member is provided with an intake valve 61 and an exhaust valve 62 to control the inflow and outflow of air. Furthermore, an air filter may be attached to the intake valve 61 to prevent solid matter from flowing in other than air.

The pistol-shaped grip at the bottom of the casing 1 contains manganese, alkali,
A battery 8 made of nickel cadmium, lead, etc. is housed in a replaceable manner. The power switch 9 is located in the pistol-shaped trigger portion of the casing 1, and operates as a momentary type that energizes only when pressed.

The applicator is disposed at the front of the casing 1, and the pistol-shaped muzzle serves as the spray nozzle 7.

The spray nozzle 7 is a gas nozzle 71. Liquid nozzle 72
．． Consists of a spray amount adjustment needle 73 and a gas nozzle 71
The exhaust valve 62 of the air compression member 5 and the liquid nozzle 72 are located below the spray nozzle 7 and are connected by piping to the liquid storage tank 10 that stores the liquid. The spray IT adjustment needle 73 is connected to the power switch 9 via a link mechanism 74, and is interlocked with the switch operation of the motor.

The spray nozzle 7 and the liquid storage tank 10 can be separated from the main body for internal cleaning.

action Next, the operating state will be explained.

The battery 8 is installed in the buffer housing, and the liquid to be sprayed is poured into the liquid storage tank 10. The preparation for spraying is now complete.

Next, the power switch 9 is pressed to start the motor 2. The rotational force of the motor is transmitted to the deceleration a3, and after being decelerated, the cam 4 is rotated with a larger torque. As the cam 4 rotates, the air compression member 5 slideably contacts the cam 4 or
The built-in actuator 53 performs one stroke of suction compression per one rotation of the cam. Since the air compression members 5 are arranged at 120° intervals on the same circumference as the cam surface, suction and compression are performed sequentially, and smooth compressed air is obtained.

The compressed air obtained by the above action is guided from each exhaust valve 62 of the air compression member 5 to the gas nozzle 71 in the spray nozzle 7 via piping.

The gas nozzle 71 has an orifice at its tip.
The compressed air whose flow rate has been increased here uses a siphon action to suck up the liquid in the liquid storage tank 10 from the liquid nozzle 72 and atomize it.

When the power switch 9 is not pressed, the spray amount adjustment needle 73 in the liquid nozzle 71 that is linked to the power switch 9 always comes into contact with the inner surface of the liquid nozzle 72 to prevent liquid leakage. When 9 is pressed, the switch fittings 91 and 92 come into contact and the motor 2 starts, and then
Due to the play portion 75 provided in the link mechanism 74, the spray amount adjusting needle 73 opens the liquid nozzle with a slight delay from the activation of the motor, waiting for the pressure of the compressed air to rise. When the power switch 9 is pressed further, the spray i adjustment needle 73 also moves rearward in accordance with the amount of movement, the opening area of the liquid nozzle 72 is expanded, and the amount of spray is also increased. Furthermore, when the power switch 9 is released from being pressed, the spray amount adjustment needle 73 immediately comes into contact with the inner surface of the liquid nozzle 72, thereby preventing the liquid from dripping due to a drop in pressure.

Effects of the Invention Since the present invention is constructed as described above, the finished state of the coated surface is not inferior to that of a two-fluid atomizing spray gun using a compressor or gas cylinder, and the power source is inexpensive and easy to use. Because it uses batteries that are available in
Moreover, it can be supplied at a low price, and since the spray pressure is low, by operating the spray amount adjustment needle, a narrow spray width of about 511 m to 50 mm can be achieved.
As a result, it has many features not found in conventional spray applicators, such as writing on uneven surfaces that cannot be written on with brushes, illustrations, and model work.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal cross-sectional view of a spray gun with a built-in compressor according to the present invention, Fig. 2 is a partially cutaway side view showing the arrangement of the air compression member of the spray gun with a built-in compressor in Fig. 1, and Fig. 3 shows another embodiment. FIG. 2 is a longitudinal cross-sectional view of the spray gun with built-in compressor shown in FIG. 1...Casing 2-Motor 21--
Motor output shaft 3--Reducer 31-Reducer output shaft
4-Cam 5-・Air compression member 53-・Actator 61・・-Suction valve 62-・Exhaust valve 7・-Spray nozzle 71・
~ Gas nozzle 72 Liquid nozzle 73 Spray IT adjustment needle 8 Battery 9 Power switch 10 Liquid storage tank

Claims (1)

[Claims] 1. A two-fluid spray applicator that sprays liquids such as paints, inks, and chemicals using compressed air, including a casing 1 and a small DC motor with an output of 1 W to 80 W housed in the rear of the casing. 2, and a reducer 3 to the small DC motor 2.
and three or more air compression members 5 connected via a conversion mechanism that converts the rotational force of the speed reducer into reciprocating motion, each of which sequentially sucks in and compresses air, and controls the inflow and outflow of air of the air compression members. a compressor section, which is housed in the front part of the casing 1; was done,
A spray gun with a built-in compressor for applying liquids, characterized in that a liquid storage tank 10 for storing liquids such as paints, inks, chemicals, etc., and an application section consisting of a spray nozzle 7 are integrated. 2. The casing 1 is pistol-shaped, and the motor 2
is located at the rear of the casing 1, and the output shaft 21 of the motor 2
is connected to the reducer 3, and the cam 4, which is fixed to the output shaft 31 of the reducer 3, is composed of a piston and a cylinder or a bellows-like member, and is provided with an intake valve 61 and an exhaust valve 62 at one end. pistons of more than one air compression member 5, or
An actuator 53 provided on the movable side of the bellows-shaped member is slidably abutted or incorporated, and a battery 8 is replaceably housed in the lower part of the casing 1 and a power source located in the trigger part of the casing 1. A compressor section configured by a switch 9, a gas nozzle 71, a liquid nozzle 72,
A spray nozzle 7 consisting of a spray amount adjustment needle 73, and a removable liquid storage tank 1 located at the bottom of the spray nozzle 7.
0, gas nozzle 71, exhaust valve 62, liquid nozzle 7
2 and the liquid storage tank 10 are connected by piping, and the spray amount adjustment needle 73 is connected to the power switch 9.
Claim 1, characterized in that an applicator configured to interlock with the casing 1 is integrated into the casing 1.
Spray gun with built-in compressor as described in section.