JPH0746359Y2 - Internal spray spray gun paint spray rate controller - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention is a paint ejection amount adjusting device for an internal mixing type spray gun for spraying paint or the like. Atomization with a valve at the tip of the spray gun body that allows adjustment of the flow passage cross-sectional area of the paint passage inside the spray gun body in order to obtain a spray gun with good atomization performance, especially with a small amount of air and low air pressure. The present invention relates to a paint ejection amount adjusting device for an internal mixing type spray gun configured to be built in at a position close to a part.

[Prior Art] There are many types of spray guns typified by painting, but the air spray gun that atomizes with air is most widely adopted. However, the air spray gun is apt to be the biggest drawback because atomized paint particles are easily scattered by the diffusion of compressed air. Therefore, atomization with a smaller amount of air and a lower pressure of air is a challenge. In that sense, an internal mixing type spray gun that mixes compressed air and paint inside the air cap of the spray gun and sprays simultaneously from the spray port of the air cap is suitable. It is used in a special spray gun that requires a spray amount of.

However, in the case of this internal mixing type spray gun, the amount of air used is limited, it is difficult to make fine mist, it is not possible to improve the finished surface, and paint and air are mixed inside the air cap. , Since it is sprayed from one fixed air cap outlet, if the air pressure for spraying or the amount of air changes, the amount of paint to be sprayed changes, which balances the amount of paint and air. Collapse,
There are problems that the atomization state changes, and the finished surface is different.

For this reason, the internal mixing type spray gun was not used for finish painting, which emphasizes quality, but recently, due to problems with hygiene and pollution against the scattering of fog, this type of spray gun was adopted. A spray gun with a high-quality finish is conceivable, and even with the spray gun proposed by the applicant of the present invention (Japanese Patent Application No. 1-79337, etc.), the fluctuation of the paint ejection amount is unavoidable. As a countermeasure, Japanese Patent Application No. 1-209442 has been proposed. this is,
A means for adjusting the amount of paint supplied to the spray gun is attached to a member formed separately from the spray gun main body at the paint supply port of the spray gun main body. That is, this member is provided outside the spray gun body.

[Problems to be Solved by the Invention] In a conventional general spray gun, the opening of a needle valve, which is a paint valve, is regulated as means for adjusting the amount of paint sprayed. Since the position changes and it becomes difficult to operate, or the outlet of the paint nozzle is squeezed, the paint may partially flow out and the flow velocity may change, resulting in unevenness in the paint and air mixing part. It is intended to be controlled by the paint supply device side.

The above-mentioned means that has already been proposed is to stabilize the spray amount of the paint by using various adjusting means with respect to the spray gun. By providing the supply amount adjusting means of the paint on the supply device side, the spray gun itself is provided. It is possible to adjust the gun without using it, and it is possible to replace the gun.

However, considering that it is more desirable to attach an adjusting means to the spray gun body itself for ease of operation,
As described above, in the paint supply port of the spray gun, to a member formed separately from the spray gun main body, that is, when it is attached to the outside of the spray gun main body, the main body and the connecting portion constituting the valve are connected. Is required separately, which is costly.In addition, when a paint container is attached to the member, extra space is taken up by that much, and there is a problem that the spray gun device becomes large in size and deteriorates in operability. Occur.

[Means for Solving the Problems] In order to solve the above problems, the present invention provides a needle valve that moves a paint nozzle inside an air cap and moves inside the paint nozzle in conjunction with a trigger operation. Along with
Inside the air cap, after mixing the paint ejected from the paint nozzle and the compressed air supplied between the paint nozzle and the air cap, the paint is ejected outward from the ejection port of the air cap. In the paint injection amount adjusting device for an internal mixing type spray gun, a paint supply port is formed at a position close to the tip atomizing part of the spray gun body, and the paint supply port and the inside of the paint nozzle are connected to each other by a spray gun. In the paint passage formed by communicating in the main body,
The valve is divided into an inflow passage and an outflow passage, and a valve that allows the flow passage cross-sectional area of the paint passage to be adjusted by the adjusting position is provided.
It is characterized in that a paint ejection amount adjusting device is provided in addition to the drawing allowance by the needle valve.

[Operation] According to the above configuration, the paint supplied into the spray gun body passes through it by the valve mounted in the position close to the tip atomizing part of the spray gun body so as to be directly built in the spray gun body. The flow rate is regulated, and if necessary, it is adjusted to a proper ejection amount, and then sent to the paint nozzle and ejected.

[Embodiment] FIG. 1 is a sectional view of the entire spray gun showing an embodiment of the present invention, and FIG. 2 is a sectional view taken along line II-II of FIG. The spray gun body 1 will be described with reference to the drawings.
Has an atomizing portion A at the tip, an adjusting operation portion B at the rear portion, and a grip C at the lower portion thereof, and the paint supply port 2 is provided at a position close to the tip atomizing portion A.

The blowing air is introduced from the connection port 3 provided at the lower end of the grip C and sent to the atomizing unit A via the adjusting operation unit B. The atomizing section A is mainly constituted by an air cap 4 at the tip, a paint nozzle 5 inside the center of the air cap, and a needle valve 7 for stopping and ejecting paint by coming into contact with and separating from the inner end of an ejection port 6 of the paint nozzle 5. There is. The needle valve 7 extends from the rear adjusting operation portion of the main body 1 and is moved back and forth by a trigger 8 and a spring 9.
The paint nozzle 5 is screwed into the tip of the main body 1 and has a paint passage 10 inside and is connected to the supply port 2.

The air cap 4 encloses the paint nozzle 5 and is detachably fixed to the main body 1 by a cover 11. In the present invention, as shown in FIG. 2, the paint supply port 2 and the paint passage 10 of the paint nozzle 5 formed integrally with the spray gun body.
A valve 12 is interposed between the valve 12 and
And it is divided into 14 outflow channels. Valve 12 has a rear thread 15
Is screwed into a valve guide 16 provided on the side surface of the main body 1 so that it can be moved forward and backward, and can be adjusted with a knob 17.

The seal ring 18 is provided to prevent leakage and the spring 19 is provided to prevent loosening. The tip of the valve 12 is formed as a seat with a taper of an acute angle, and is formed so that the amount of advance / retreat can be finely adjusted.

[Advantage of the Invention] With the above configuration, according to the present invention, the spray amount of the paint can be adjusted by the adjusting valve built into the spray gun main body, and the change of each paint condition including the change of the spray pressure can be performed. The ejection volume can be adjusted correspondingly.

Especially in the case of the present invention, the spray amount is not adjusted by the triggering margin, but is adjusted by the valve built in close to the tip atomization part of the spray gun body, so that the operability of the spray gun is not impaired. It is possible to spray, and the end of the needle valve that stops and discharges the paint by contacting and separating from the inner end of the discharge port of the paint nozzle is fully opened.
There is no partial non-uniformity in the jet flow of paint, and even in the case of gas-liquid, it is performed sufficiently uniformly, and it is possible to form a smooth coating surface by uniform atomization.

In addition, a joint valve such as a paint nipple mounted outside the spray gun body is not provided with a separate control valve on the paint supply side, but a valve is built in at a position close to the atomizing part at the tip of the spray gun body. Therefore, there is an advantage that the operability is not impaired, the number of parts is small, and the cost can be reduced.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention, and FIG. 2 is a sectional view taken along line II-II of FIG. 2 ... Supply port 4 ... Air cap 5 ... Paint nozzle 6 ... Jet port 7 ... Needle valve 10 ... Paint passage 12 ... Valve 13 ... Inflow passage 14 ... Outflow passage

Claims (1)

[Scope of utility model registration request] 1. A paint nozzle (5) is provided inside an air cap (4), and a needle valve (7) is provided inside the paint nozzle (5) that moves in conjunction with the operation of a trigger (8). In addition, the paint ejected from the paint nozzle (5) and the compressed air supplied from between the paint nozzle (5) and the air cap (4) were mixed inside the air cap (4). After that, in a paint jetting amount adjusting device of an internal mixing type spray gun for jetting paint outward from the jetting port of the air cap (4), a position close to the tip atomizing part (A) of the spray gun body (1). A paint passage (10) is formed by forming a paint supply port (2) in the interior of the paint gun (5) and connecting the paint supply port (2) with the interior of the paint nozzle (5). The inside is divided into an inflow path (13) and an outflow path (14), and the control position is Accordingly, the paint passage (10) of the channel cross-sectional area of the adjustable paint ejection amount adjustment device of the internal mixing type spray gun, characterized in that arranged the valve (12) to be.