JPH0822397B2 - Spray gun with built-in compressor - Google Patents

Description

The present invention relates to a spray gun with a built-in compressor for liquid application using compressed air. More specifically, it is suitable for coating a small area in which a compact compressor composed of a motor, an air compression member, a battery, etc. and a coating part composed of a spray nozzle, a liquid storage tank, etc. are integrally housed in a casing. The present invention relates to a portable spray gun with a built-in compressor.

Conventional technology The compressed air or gas pressure source that has been used in conventional spray guns is either compressed air from a large compressor driven by an AC power supply, used through a hose, or Freon gas or dimethyl ether LP gas. The two main methods were to install the above cylinders in a spray gun and use the high pressure gas from the cylinders.

Also, regarding the integrated sprayer in which the motor, the battery, etc. are housed inside the casing, see JP 58-11387, JP 5
Although proposals such as 8-11388 have been made, all of them are airless type in which the liquid to be sprayed is directly pressurized by a pump and atomized, so the particles of the atomized liquid are relatively large and are mainly chemicals. It was for spraying and was not suitable for painting that required a uniform coating.

Problems to be Solved by the Invention In a conventional spray gun, particularly a two-fluid spray type spray gun that performs spraying using compressed air or pressurized gas, a compressor using an AC power source as a pressure source, a CFC gas, or dimethyl ether. I used a cylinder of LP gas.

The former compressor using an AC power supply is the most suitable pressure source for a spray gun in terms of both pressure and flow rate, but it is difficult to use outdoors because it uses an AC power supply, and the compressor itself is heavy, large, and expensive. There were many problems.

The latter gas cylinder is small, lightweight, and inexpensive, and can be used outdoors, but the usage time per cylinder is short, and the gas temperature drops due to the heat of vaporization during continuous use, and gas vaporization is Since the pressure deteriorates, there is a problem that the pressure is lowered and the spray becomes difficult.

Further, in an integrated sprayer in which a motor, a battery, etc. are housed inside a casing, an airless system is mainly adopted in which a liquid is directly pressurized by a pump to spray, and in the above system, atomized liquid particles are generated. It was relatively large and was mainly used for spraying chemicals, and was not suitable for painting that required a uniform coating film.

SUMMARY OF THE INVENTION The present invention aims to provide a spray gun with a built-in compressor which solves the above problems, can be used by a simple operation, is inexpensive, and is capable of fine atomization suitable for painting.

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

Reference numeral 1 denotes a casing, which is made of metal or synthetic resin and has a pistol 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 speed reducer 3 with a reduction ratio of 15: 1 to 60: 1 is installed on the output shaft 21 side of the motor 2, respectively. The cam 4 fixed to the output shaft 31 of 3 is rotated at 150 to 650 rpm. Cylinder 5 for cam 4
Combination with 1, piston 52 and spring 54 (Figs. 1 and 2
Or an actuator 53 of an air compression member 5 composed of an expandable and contractible bellows-like member (Fig. 3) slidably abuts or is incorporated, and reciprocates as the cam 4 rotates. . Further, the spring 54 becomes unnecessary when the cam 4 has a grooved cam shape. In order to prevent the pulsating flow of compressed air, three or more air compression members 5 are required, and the operation timing of each is controlled by the cam 4. Further, each air compression member is provided with an exhaust valve 61 and an intake valve 62, and controls the inflow and outflow of air. Furthermore, an air filter may be attached to the intake valve 62 in order to prevent the inflow of solid matter other than air.

A battery 8 of manganese, alkali, nickel cadmium, lead, or the like, which is a power source for driving a small DC motor, is exchangeably housed in the lower portion of the casing 1 and a pistol-shaped grip portion. The power switch 9 is located on the casing 1 and the pistol-shaped trigger portion, and the operation type is a momentary type that energizes only when pressed.

The application part is arranged in the front part of the casing 1, and the pistol-shaped muzzle part serves as the spray nozzle 7.

The spray nozzle 7 comprises a gas nozzle 71, a liquid nozzle 72, and a spray amount adjusting needle 73. The gas nozzle 71 is a pipe, and the exhaust valve 61 of the air compression member 5 and the liquid nozzle.
72 are located in the lower part of the gas nozzle 71, and are connected to the liquid storage tank 10 that stores a liquid. The spray amount adjusting needle 73 is connected to the power switch 9 via a link mechanism 74, and interlocks with the switch operation of the motor.

Since the spray nozzle 7 and the liquid storage tank 10 clean the inside, they can be separated from the main body.

Next, the operation state will be described.

The battery 8 is mounted in the battery storage portion, and the liquid to be sprayed is injected into the liquid storage tank 10. This completes the preparation for spraying.

Next, the power switch 9 is pushed to start the motor 2.
The rotational force of the motor is transmitted to the speed reducer 3, and after being decelerated,
The cam 4 is rotated with a larger torque. With the rotation of the cam 4, the air compression member 5 slidably abuts on the cam 4, or the built-in actuator 53 causes the air compression member 5 to rotate once per cam rotation.
Perform inhalation compression of the process. Since the air compression members 5 are arranged at 120 ° intervals on the same circumference as the cam surface, suction compression is sequentially performed, and smooth compressed air is obtained.

The compressed air obtained by the above action is the air compression member 5
From each exhaust valve 61 to the gas nozzle 71 in the spray nozzle 7 through a pipe.

The tip of the gas nozzle 71 is an orifice,
Here, the compressed air whose flow velocity is increased sucks up the liquid in the liquid storage tank 10 from the liquid nozzle 72 by a siphon action and atomizes the liquid.

The spray amount adjusting needle 73 in the liquid nozzle 71 interlocked with the power switch 9 is always in contact with the inner surface of the liquid nozzle 72 to prevent the liquid from leaking when the power switch 9 is not pressed. When 9 is pressed, the switch fittings 91, 92 come into contact with each other and the motor 2 is started, and then the spray amount adjusting needle 73 is provided by the play portion 75 provided in the link mechanism 74.
Is slightly delayed from the start of the motor, and waits for the pressure of the compressed air to rise before opening the liquid nozzle. When the power switch 9 is pushed further deeper, the spray amount adjusting needle 73 also moves rearward with the movement amount thereof, the opening area of the liquid nozzle 72 is enlarged, and the spray amount is also increased. Also, the power switch 9
Immediately after releasing the pressure on the
73 contacts the inner surface of the liquid nozzle 72, and prevents the liquid from dropping due to pressure drop.

EFFECTS OF THE INVENTION Since the present invention is configured as described above, it is not inferior to a two-fluid spray type spray gun using a compressor or a gas cylinder in the finished state of the coating surface, and it is inexpensive and easy to use as a power source. Since it is possible to use a battery that is available for use, it can be made into a compact shape with excellent mobility and can be supplied at a low price. Furthermore, since the spray pressure is low, the spray amount adjustment needle is operated. As a result, a narrow spray width of about 5 mm to 50 mm can be obtained, so it is possible to use conventional spray applicators such as writing letters on uneven surfaces that cannot be written with a brush or brush, illustration, and application to model work. It has many unique features.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a spray gun with a built-in compressor of the present invention, FIG. 2 is a partially cutaway sectional view showing the arrangement of air compression members of the spray gun with a built-in compressor of FIG. 1, and FIG. 3 is another embodiment. It is a longitudinal cross-sectional view of the spray gun with a built-in compressor shown. 1 ... Casing, 2 ... Motor 21 ... Motor output shaft, 3 ... Reducer 31 ... Reducer output shaft, 4 ... Cam 5 ... Air compression member, 53 ... Operator 61 ... Exhaust valve , 62 ... Intake valve 7 ... Spray nozzle, 71 ... Gas nozzle 72 ... Liquid nozzle, 73 ... Spray amount adjusting needle 8 ... Battery, 9 ... Power switch 10 ... Liquid storage tank

Claims (2)

[Claims] 1. A two-fluid spray applicator for spraying a liquid such as paint, ink and chemicals by compressed air, and a casing 1 and a small DC motor 2 having an output of 1W to 80W, which is housed in the rear portion of the casing. It is connected to the small DC motor 2 through a speed reducer 3 and a conversion mechanism for converting the rotational force of the speed reducer into a reciprocating motion, and sucks and squeezes air in sequence 3
A plurality of air compression members 5, a valve mechanism for controlling the inflow and outflow of air of the air compression member, a battery 8 for the power source of the small DC motor, the small DC motor 2, and a power source of the small DC motor. A compressor unit composed of a power switch 9 for disconnecting the connection, a liquid container 10 housed in the front part of the casing 1 for containing liquids such as paints, inks and chemicals, and an application unit composed of a spray nozzle 7 are integrally combined. A spray gun with a built-in compressor for liquid application. 2. The casing 1 is a pistol type,
The motor 2 is located at the rear of the casing 1, the output shaft 21 of the motor 2 is connected to the speed reducer 3, and the output shaft of the speed reducer 3 is further connected.
The cam 4 fixed to 31 is composed of a piston and a cylinder or a bellows-shaped member, and is provided with an exhaust valve 61 and an intake valve 62 at one end thereof.
An actuator 53 provided on the movable side of the bellows-like member is slidably brought into contact with or incorporated into the bellows-like member, and the battery 8 exchangeably housed in the lower portion of the casing 1 and the power source located at the trigger portion of the casing 1 are provided. A compressor unit configured by a switch 9, a spray nozzle 7 including a gas nozzle 71, a liquid nozzle 72, and a spray amount adjusting needle 73, a removable liquid storage tank 10 located below the spray nozzle 7, Gas nozzle 71 and exhaust valve 61, liquid nozzle 72 and liquid storage tank 1
0 is connected by a pipe, respectively, and the spraying amount adjusting needle 73 has an application part configured to interlock with the power switch 9 and is integrally incorporated in the casing 1. A spray gun with a built-in compressor according to item 1.