JPH0688006B2 - Spray gun for painting - Google Patents

Description

TECHNICAL FIELD The present invention relates to a fan-shaped spray flow suitable for coating by supplying an air flow from the periphery to a fan-shaped spray ejected from an orifice type flat spray nozzle. The present invention relates to a spray gun adapted to generate

(Problems of the prior art) Various spraying devices have been announced in which an air flow is added to the fan-shaped spray from an orifice type flat-spraying liquid jet nozzle from the surroundings. 57-
There are those described in Japanese Patent No. 90762 and Japanese Patent Application Laid-Open No. 50-53430.

The prior art described in Japanese Utility Model Laid-Open No. 57-90762 is also provided under the condition that a lip-shaped jet nozzle formed by the intersection of a dome-shaped concave hole and a groove is crowned on a flat spray nozzle. Therefore, the fan-shaped spray ejected from the jet nozzle in the fan-shaped air flow is ejected in a common plane relationship to improve atomization and prevent mist scattering. Tail generation prevention effect, mist scattering prevention effect, spray flow disturbance prevention effect, etc. are recognized, but it is especially sufficient for finish coating of highly adhesive paints that tend to generate tails, metallic paints that tend to cause spots on the coating It was not satisfactory, and the fan-shaped spray was liable to be twisted, and there was a defect that a highly accurate processing technique was required in manufacturing the nozzle.

Further, the prior art described in Japanese Patent Application Laid-Open No. 50-53430 supplies a fan-shaped spray ejected from a flat spray jet nozzle with a hollow conical air stream that gradually narrows from the rear to the front. The airflow is supplied to both sides of the air in a diagonally forward direction, and the atomization effect, tail generation prevention effect, mist scattering prevention effect, etc. are intended for this purpose. Since it is difficult to maintain the balance of the air flow of the fan-shaped spray flow, the fan-shaped spray flow is partially shaded, and a turbulent phenomenon of swinging under the line is likely to occur,
There is a serious defect that causes uneven painting.

(Object of the present invention) The present invention further improves the atomization effect, the tail generation prevention effect, the mist scattering prevention effect, the spray flow disturbance prevention effect, and the like, and at the same time, prevents the spray flow from twisting. It is intended to provide cancer.

(Characteristics of the Present Invention) In order to achieve the above object, the present invention is arranged such that a front end of a spray gun main body is provided with a squirt nozzle member in a state of being crowned with an orifice type flat spray liquid nozzle, and the squirt nozzle member includes: A spray cone conical fumarole formed by crossing a vertical fan opening that gradually narrows forward and a horizontal fan opening that gradually widens forward is opened. On the peripheral side of the orifice type flat spray nozzle, the long axis of the lip-shaped jet port and the long axis of the vertically oriented fan-shaped opening of the orifice type flat spray nozzle are the same. They are arranged so that they have a directional relationship.Furthermore, projections are provided on both sides of the spray conical fumarole that are appropriately separated in the longitudinal direction from the lateral fan-shaped openings, and the inside of this projection is used for spray flattening. Make the fumarolic nozzle diagonally forward Therefore, the fan-shaped spray ejected from the orifice type flat-blown jet nozzle is propelled by the cross-shaped air flow ejected from the spray conicing fumigation nozzle in the tendency to once conical, while the spray flattening fumes are propelled. The spray angle of the fan-shaped spray is widened by the air flow ejected from the nozzle.

(Example) Hereinafter, the example which shows the coating spray gun of this invention in drawing is demonstrated in detail.

As shown in FIGS. 1 to 3, the spray gun body 1
The valve seat 2 is fixed to the central portion of the spray gun main body 1 through which the needle valve 3 corresponding to the valve seat 2 is provided so as to move back and forth. The paint which is pressure-fed from the rear of the spray gun can be fed from the valve seat 2 to the front by retreating the needle valve 3, and at the front end of the spray gun body 1 there is a lip-shaped jet 5c. A holder 6 having a flat-blowing jet nozzle 5 fixed to the tip thereof is provided oppositely with an interposition of a packing 7, and on the outer peripheral side of this holder 6, a vertical cross-section having a substantially oval shape and gradually narrowing forward is formed. A spray cone conical fumarole 10 formed by slightly expanding the center while crossing the facing fan-shaped opening 8 and the lateral fan-shaped opening 9 having a substantially oval cross section and gradually expanding toward the front. The opened fumarolic nozzle member 11 has its fan-shaped opening facing vertically. The long axis of the lip-shaped liquid jetting port 5c is fitted to exert Glorious to the same directional relationship in the major axis and the orifice-type flat blow liquid jetting nozzle 5 of the nut
It is attached to the front end of the spray gun body 1 by means of 12, and the spray gun body 1 and the holder 6 are provided with ventilation passages 13 and 14 respectively so as to communicate with the jet nozzles 10, so that pressurized air supplied from the rear can be supplied to both sides. While supplying air from the ventilation passages 13 and 14 to the fumarole 10, the fan-shaped airflow expanding forward from the fumarole 10 and the fan-shaped airflow narrowing forward are ejected in a cross-shaped cross section intersecting with the central axis. At the base of the air flow having a cross-shaped cross section and gradually fan-shaped forward, the elliptical cross section of the fan-shaped spray from the orifice type flat spray nozzle 5 is appropriately circularized, and further the jet nozzle member is provided. The protrusion 11 is provided at 11 on both sides of the fumarole 10 that are appropriately distant from the lateral fan-shaped opening 9 in the long axis direction so as to face the both sides of the fan-shaped paint spray, and the protrusions 15 and 15 are provided. Part 15,15 In addition, two pairs of atomizing nozzles for spray flattening 16 and 16 are directed obliquely forward under the condition that they are directed near the front outside the longitudinal axis end of the vertically oriented fan-shaped opening 8 and gradually expand with the adjacent nozzles. It is provided in an open state, so that the air streams ejected from the atomizing nozzles 16 for spray flattening can be made to collide with each other in the vicinity of both edges near the fan-shaped atomizing base ejecting from the orifice type flat-blowing jet nozzle 5. In addition, the spray flattening fumarolic nozzles 16 and 16 are provided with the ventilation passages 17 and 17 communicating with them in the rearward direction, and the spray gun body 1 is provided with a ventilation passage 18 communicating with the ventilation passage 17. Ventilation path for pressurized air supplied from the rear
While supplying the flattening fumes nozzles 16 and 16 from 18,17, the air flow ejected from the spray flattening fumes nozzles 16 and 16 is diagonally forward and the opposite air flow and both end edges near the base of the fan-shaped spray After colliding on the outer side near the part, it is flattened by the confluence and propelled outward in a diagonally forward direction, thereby attracting the fan-shaped spray with a conical tendency outward and widening the fan-shaped angle. It becomes.

As the orifice type flat-spraying jet nozzle 5, for example, as shown in FIGS. 5 to 7, in addition to providing a recessed hole 5a in a rear open state having a dome-shaped end portion in a short cylindrical nozzle member, a front end A groove 5b having a V-shaped cross section is provided in the portion so as to intersect with the end portion of the recessed hole 5a, and a lip-shaped jet port 5c is opened.

Further, conductive wires 19 and 20 penetrating the spray gun main body 1 and the squirt nozzle member 11 are provided under the interposition of a contact portion on the way, and the tip of the conductive wire 20 is used as a needle electrode 21 to be used as the squirt nozzle portion 11. In one of the protruding portions 15 of one of the above, it is projected obliquely inward from a portion close to the tip end and is arranged near the base surface of the fan-shaped spray.
And by applying a high voltage through the conductive wires 19 and 20, it is possible to charge the fan-shaped spray with high-voltage charges and adapt it to electrostatic coating, and further improve atomization efficiency and deposition efficiency. Of.

In addition to the above, an obliquely forward squirting nozzle that heads outward toward the long axis of the vertically oriented fan-shaped opening 8 toward the edge of the fan-shaped paint spray
24, 24 may be provided to prevent the spray cone from being accelerated and the generation of a tail to be prevented. Further, with respect to the position of the orifice type flat spray nozzle 5 in the front-rear direction with respect to the spray cone-forming fumarole 10, The orifice type flat spray nozzle 5 is projected forward to reduce the conical action on the spray, or is retracted rearward to strengthen the conical action on the spray, as compared with the embodiment of FIGS. 1 to 3. You can

In addition, the vertical fan-shaped opening 8 in the fumarolic nozzle member 11
The horizontal fan-shaped opening 9 and the lateral fan-shaped opening 9 may be divided into two by the holder 6 as shown in FIG.

The spray flattening blast nozzles 16 and 16 for widening the fan-shaped angle of the spray are not limited to the above-mentioned embodiments, and it is natural that various structures can be adopted.

With the above configuration, when using it, the supply pressure of the paint is several to 150 kg / cm ^2, and the supply pressure of air is several kg / cm.
It is selected from ² or less, and it is possible to adapt to a wide range of low-viscosity to high-viscosity paints and other paints of various properties by selecting their supply pressures.

(Effect) As described above, the present invention provides a spray conical shape formed by intersecting a vertical fan-shaped opening that gradually narrows forward and a horizontal fan-shaped opening that gradually expands forward in a cross shape. A jet nozzle for the spray is opened, and the air flow jetted from the jet nozzle for spray cone conical propelling the fan-shaped spray jetted from the orifice type flat spray jet nozzle forward in a conical tendency. Since it was made to flatten by the air flow from the spray flattening fumes nozzles on both sides, this not only improves the atomization effect and the mist scattering prevention effect, but also from the vertical fan-shaped opening that gradually narrows forward. It is possible to reduce the tail-generating element by making the air flow of the air strike against both edges of the fan-shaped spray, and by deforming the spray once under the conical tendency, it is combined with the subsequent flattening. Uniform atomization And, moreover the hunting of spray flow A as it can be reliably prevented, even spray cone of a jet ports can be straight without causing twisting the fan-shaped spray by a sectional cross-shaped.

[Brief description of drawings]

1 to 3 show a main part of a coating spray gun of the present invention in one embodiment. FIG. 1 is a vertical sectional side view, FIG. 2 is a partially broken front view, and FIG. FIG. 4 is a cross-sectional plan view, FIG. 4 is a front view of only a main part in another embodiment, FIG. 5 is an enlarged vertical side view of only an orifice type flat spray nozzle, and FIG. 6 is a front view of the same nozzle. FIG. 7 and FIG. 7 are cross-sectional plan views of the jet nozzle. 1 …… Spray gun body 5 …… Orifice type flat spray nozzle 5a …… Concave hole 5b …… Groove 5c …… Lip jet nozzle 6 …… Holder 8 …… Vertical fan-shaped opening 9 …… Horizontal fan Aperture 10 …… Fume nozzle for atomizing the spray 11 …… Fume nozzle member 16 …… Fume nozzle for flattening the spray

Claims (1)

[Claims] 1. A nozzle member is provided with a recessed hole (5a) having a dome-shaped end portion in a rear open state, and a groove (5b) having a V-shaped cross section is provided at a front end portion of the recessed hole (5a). An orifice type flat spray liquid nozzle (5) of a type in which a lip-shaped spray liquid opening (5c) is provided so as to intersect the portion is adopted, and this orifice type flat spray liquid nozzle (5) is held by a holder (6). ) Is attached to the front end of the spray gun body (1) while it is fixed to the spray gun body (1), and the vertical fan-shaped opening (8) is gradually narrowed forward and the horizontal fan-shaped opening () is gradually expanded forward. An atomizing nozzle member (11) is provided which has a spray conicing fumarole (10) formed by crossing with 9) in a cross shape near the center near the front end. The orifice type flat-blown jet nozzle (5) is capped under the same axial relationship. The spray nozzle body (1) is attached to the front end of the spray gun body (1) in a hanging state, and the jet nozzle member (11) has a long axis of the vertically oriented fan-shaped opening (8) and a lip-shaped jet liquid in the orifice type flat spray liquid nozzle (5). A fan-shaped spray ejected from the lip-shaped jet nozzle (5c) and a fan-shaped air flow ejected from the vertically oriented fan-shaped opening (8) are arranged so that the long axis of the mouth (5c) has the same directional relationship. And are jetted in a common plane relationship under a common axis, and further, in the fumarolic nozzle member (11), projecting portions (15) on both sides, which are appropriately separated in the longitudinal direction from the lateral fan-shaped opening (9). , (15), and spray nozzles (16), (16) for flattening the spray inside the protrusions (15), (15) in a diagonally forward direction.