JPH073736U - Nozzle for painting - Google Patents

Abstract

(57) [Summary] [Purpose] To suppress the amount of atomizing air when the discharge amount of paint is small in the dual-purpose nozzle. A ring shape capable of closing a part or all of the auxiliary air outlet in an air supply chamber 10 formed on the rear surface side of the main air outlet 7 and a plurality of auxiliary air outlets 8a around the main air outlet 7. The lid 15 is detachably attached. When the amount of paint discharged is large, if the lid 15 is removed, atomized air is jetted from all the auxiliary air jets in addition to the main air jet 7, and the paint is atomized well. When the discharge amount is small, when the lid 15 is fitted into the air supply chamber 10, a part or all of the auxiliary air ejection port is blocked, the atomized air amount is reduced, and the paint particles are blown out more than necessary. Is prevented.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a coating nozzle suitable for use in both cases when changing the amount of paint to be sprayed.

[0002]

[Prior art]

 First, an example of a conventional coating nozzle will be described with reference to FIGS. 1 and 2 showing an embodiment of the present invention.

Reference numeral 1 is a nozzle main body attached to the tip of a gun 2 of an electrostatic air spray gun, and a paint ejection port 5 through which a needle-shaped electrode 4 is inserted is opened in the center of the front surface of the nozzle main body. The nozzle tip 3 is attached so as to project.

An air cap 6 is attached to the front surface of the nozzle body 1, and the air cap 6 is formed with a main air ejection port 7 that opens in a ring shape around the paint ejection port 5. In addition, a plurality of auxiliary air jets are formed around the main air jet 7, and these two auxiliary air jets are arranged in a radial direction as shown in FIG. 8a are formed at upper and lower symmetrical positions, and three 8b arranged in the circumferential direction are formed at left and right symmetrical positions, respectively.

The air cap 6 is fixed to the front surface of the nozzle body 1 by tightening with a nut 9, and a main air ejection port 7 and an auxiliary air ejection port are provided between the front surface of the nozzle tip 3 and the rear surface of the air cap 6. An air supply chamber 10 is formed at a position corresponding to the rear surface side of 8a, 8b.

Then, the paint is ejected from the paint ejection port 5, and atomized air is supplied to the air supply chamber 10 through the air passage 11 formed in the nozzle tip 3 so that the main air ejection port 7 and the auxiliary air When jetted from the jet outlets 8a and 8b, the jetted paint is atomized by the air flow, is charged from the electrode 4, and is further discharged from the pattern air jet 12 which is opened on the front surface of the outer periphery of the air cap 6. The spray pattern of the paint is adjusted by air so that it can be blown to the side of the object to be coated.

[0007]

[Problems to be solved by the device]

 By the way, when changing the discharge amount of the paint with the above-mentioned coating nozzle, the air pressure of the atomizing air is adjusted correspondingly, but in the case where one nozzle is also used in this way, In order to finely atomize the paint even when the discharge amount is large, it is general to have a structure in which a large number of auxiliary air ejection ports 8a and 8b for assisting atomization are provided as described above. However, when the discharge amount is small, the air amount tends to be too large even if the air pressure of the atomizing air is reduced.If this happens, the paint particles will be blown off more than necessary and the coating efficiency and distribution will be poor. There was a drawback.

[0008]

[Means for Solving the Problems]

 The coating nozzle of the present invention has been devised in view of the above points, and the invention of claim 1 provides a lid for closing a part or all of the auxiliary air ejection port in the air supply chamber. It is configured to be detachably attached.

Further, the invention of claim 2 is configured such that a notch is partially provided in the air supply chamber, and a lid body that can change the numerical aperture of the auxiliary air ejection port by rotating around the axis is attached. .

[0010]

[Action]

 The invention of claim 1 operates as follows. If the amount of paint to be discharged is large, if the lid is removed, atomizing air will be ejected from the auxiliary air ejection port, and the paint will be atomized well. On the other hand, when the discharge amount is small, if the lid is attached to the air supply chamber, part or all of the auxiliary air outlet will be blocked, and the atomized air amount will decrease, and paint particles will be needed more than necessary. It is prevented from being blown away.

According to the second aspect of the present invention, the position of the notch is changed by changing the mounting position of the lid in the rotational direction according to the amount of the discharge amount of the paint, and when the discharge amount is large, the opening of the auxiliary air ejection port is opened. Increase the number, and if the discharge amount is small, decrease the numerical aperture of the auxiliary air ejection port.

[0012]

[Effect of device]

 As described above, in the invention of claim 1, by only detaching the lid from the air supply chamber, reliable atomization of the paint is ensured in the case of a large discharge amount, and it is appropriate in the case of a small discharge amount. It is possible to obtain a dual-purpose nozzle that can obtain a large amount of atomized air.

According to the second aspect of the present invention, in addition to the same effect as the first aspect, since the lid can be left attached in the air supply chamber, the loss of the lid can be prevented. it can.

[0014]

【Example】

 Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. 1 to 3 show a first embodiment of the present invention. In the first embodiment, as shown in FIGS. 1 and 3, a ring shape is provided in the air supply chamber 10 of the coating nozzle described in the section of the prior art. A lid that can close the outer one of the two auxiliary air jets 8a arranged in the radial direction and the three auxiliary air jets 8b arranged in the circumferential direction from the rear surface side, respectively. The body 15 is detachably attached.

That is, when the amount of paint discharged is large, if the lid 15 is removed, atomized air is jetted from all the auxiliary air jets 8a and 8b in addition to the main air jet 7, and the paint is sprayed. Is finely atomized.

On the other hand, when the discharge amount is small, the nut 9 is loosened, the air cap 6 is removed, the lid body 15 is fitted into the air supply chamber 10, and the air cap 6 is attached again. Inside of the two auxiliary air jets 8a, which are the outer side of the two auxiliary air jets 8a and the three auxiliary air jets 8b arranged in the circumferential direction are respectively closed. The air is jetted from only this, that is, the amount of atomized air is reduced and the paint particles are prevented from being blown off more than necessary.

It should be noted that the lid 15 may close all the auxiliary air outlets 8a and 8b, or may close only the outside of the two auxiliary air outlets 8a arranged side by side. Good.

Next, a second embodiment will be described with reference to FIGS. In the second embodiment, the lid body 17 attached to the air supply chamber 10 alternately has a closed portion 18 that can close each of the auxiliary air ejection ports 8a and 8b and a cutout portion 19 that opens them, in four regions. It is formed in the provided ring shape.

Therefore, when the discharge amount is small, as shown in FIG. 5 (A) and FIG. 6 (A), the cover 17 has the closed portion 18 corresponding to the auxiliary air ejection ports 8a and 8b. When mounted in a rotating posture, the auxiliary air ejection ports 8a and 8b are closed, and atomized air is ejected only from the main air ejection port 7.

On the other hand, when the discharge amount is large, the air cap 6 is removed, and the lid 17 is rotated by 45 degrees as shown in FIGS. 5 (B) and 6 (B). The notch 19 is attached to each auxiliary air ejection port 8a, 8b in a corresponding rotational posture. Then, atomized air is ejected from all the auxiliary air ejection ports 8a and 8b.

In the second embodiment, since the lid 17 can be left attached inside the nozzle, there is no possibility of loss.

It should be noted that not only can the auxiliary air jet ports 8a and 8b be switched between fully closed and fully opened as described above by appropriately changing the areas and shapes of the closed portion 18 and the cutout portion 19 of the lid body 17. It is also possible to change the numerical aperture of the auxiliary air ejection port.

Further, the present invention can be similarly applied to a coating nozzle of a non-electrostatic type air spray gun.

[Brief description of drawings]

FIG. 1 is a sectional view of a first embodiment of the present invention.

FIG. 2 is a front view of an air cap.

FIG. 3 is a partially cutaway perspective view of the lid according to the first embodiment.

FIG. 4 is a partially cutaway perspective view of a lid body according to a second embodiment.

FIG. 5 is a partially enlarged sectional view of a second embodiment.

FIG. 6 is an enlarged view of the air supply chamber as seen from the back side.

[Explanation of symbols]

1: Nozzle body 3: Nozzle tip 5: Paint ejection port
6: Air cap 7: Main air jet 8a, 8b: Auxiliary air jet 9: Nut 10: Air supply chamber 15: Lid 17: Lid 18: Closure 19: Notch

Claims (2)

[Scope of utility model registration request] 1. A main air outlet opening around the paint outlet on the front surface of the nozzle body having the paint outlet opened,
An air cap formed with a plurality of auxiliary air jets that are open at intervals in the circumferential direction around the main air jets;
In a coating nozzle in which an air supply chamber is provided and fitted on the rear surfaces of both the jet outlets and tightened and fixed with a nut, a lid for closing part or all of the auxiliary air jet outlet is provided in the air supply chamber. A painting nozzle that is detachably attached. 2. A main air jet opening opening around the paint jet on the front surface of the nozzle body having the paint jet opening.
An air cap formed with a plurality of auxiliary air jets that are open at intervals in the circumferential direction around the main air jets;
In a painting nozzle in which an air supply chamber is provided on the rear surface of both jet outlets and fixed by tightening with a nut, the air supply chamber has a notch in part, and the auxiliary is provided by rotating around an axis. A coating nozzle equipped with a lid capable of changing the numerical aperture of an air ejection port.