DE1802150A1 - Paint spray device - Google Patents

Description

iruhvorriohtTinif

The invention relates to a spray device, in particular for colors, especially jarb sprites, in which caused the atomization of the paint to be reddish, hydrostatic bsw. hydraulic or pneumatic pressure takes place / which Torriohtung an actuator rorsugiweiae in gate »of a handle and a spray head body made of electrically non-conductive material, the one Control needle b »w. Control chair for the work, one Fare feed torriohtungy a high voltage connection and a torrent for charging and spraying the paint having.

The farbsprührorriehtung - hereinafter referred to as the spray gun - according to the invention has the following gate parts: Height electrostatic effectiveness at low voltage - losses, the spray nozzle remains clean (self-cleaning - effect), the paint flows through channels in the spray gun directly above the spray nozzle.

909819/0830

1002150

According to the invention, pita cake pieces are essentially made achieved in that the actuating stem βick in a Nozzle needle continues, which in galYanisohem, electrical Contact "the high voltage is on and you play with play inside the spray nozzle channel" where the through the Canal guided? Arb · electrically charged and then sprayed through a external spray nozzle «

An exemplary embodiment of the invention is illustrated below of the drawing, which shows further essential parts of the gate and features of the invention * The drawing shows a longitudinal section through the embodiment with hydrostatic paint atomization «

For example, the spray gun according to the invention has a grounded pistol handle 1, a spray body made of electrically insulating material 2, a control plunger or «control needle 3» «ine inner paint nozzle 4, an outer lars nozzle 5, a retaining ring 6 (union nut) and a connection body 12 for a high voltage cable 7, which base body 12 is integral with the spray body 2 «

Electrostatic spray guns are already known for years, "wosei the color even under high Druolc, about 25 to 100 kg / ² and dureh" higher a spray nozzle pressed and τ · τ- sprayed is "The invention naoh which the spray gun, for example, with a very high Druok and with atomization with

909819/0830

or without assistance Sound compressed air works, provides significantly Gate parts over the existing iilektroetatiiohen Sprtthpietolen "

The spray gun body 2 made of electrically non-conductive material is also resistant to the solvents used today in the faro industry. The spray head body is the central part of the device and white a Tielsahl tone tiny lens units. You EontrollnadelIbw * the control unit 3 consists of animal parts, n & mlieh a rear steel part 18, an electrically non-conductive middle cable% iw Inden With IuWn. for O-long is rersehen, and a rorderen rope 10 aue steel, the actual nozzle needle, which has a conical tip and in its tölllg in the nozzle 4 βingeBehedet position the nozzle abeohlieeet. The above-mentioned O-bings hold a liquid which is sealed into the space surrounding the plug-in part 19, which is made of non-conductive material and which is the greatest owing to these O-rings 8, by removing the eyebolts from the plug 9. This liquid is used for air insulation from the electrical parts in the direction of the gun. "The nozzle needle 10 forms the electrode and conducts the electrons to the paint, so that the tar is electrostatically charged," The paint is therefore charged inside the nozzle "Beror ele outside the nozzle 5 "is stunned, whereby the atomization takes place directly at the outlet of the paint outside the nozzle"

909819/0830

ORIGINAL INSPECTED

In this context it should be mentioned that the voltage decreases with the increasing possibility of the electrode to generate electrons to be unloaded or delivered. This is especially true for hand-operated electrostatic spray devices where the Safety only the small effects can be achieved · It is also known that the outwardly protruding parts, in particular made of metal, preferably emit electrons and easily form current paths to earthed objects (top effect) As is also known, the electrostatic effect is increasing lower voltage. So there is the problem of being able to use different types of outer tips to be able to balance strong electron paths with the resulting voltage losses, while still having high Must apply voltages to achieve good electrostatic effects.

It is also known that the electrostatic Effects are only used to a small extent.

The present invention gives a solution to this problem A limited outflow of electrons, which is very effectively directed directly to the blue particles, keeps high levels Electrostatic voltage is maintained, which makes it possible to charge the paint very highly and thus a high electrostatic To achieve a jar spray effect. The supply of electrons to the paint is achieved in that the paint is pressed through a channel in the inner nozzle 4 in which

909819/0830

the nozzle needle is under high tension, with only one very narrow gap or annulus surrounding the needle remains for the flow of the part. This achieves a highly effective charging of the part, since there is only a narrow gap or fiing space between the nozzle needle 10 and the nozzle wall 4 is present, which charge is additionally increased at the point-shaped Hadelspitze because of the occurring there Top effect. The electrical resistance in the part is "at the specified design very high, so only very Small stray currents flow backwards · A seat for the nozzle needle 10 is formed on the nozzle 4 around the nozzle "to close if necessary.

The spray head "consists of four parts, namely an inner 4 _f and an outer 5 spray nozzle, a retaining ring 6 (union nut) and a protective plate 11. The inner nozzle 4 is made of electrically non-conductive material, which is resistant to the Parbene and solvents The outer nozzle 5 is of the type generally known in parb atomization. The retaining ring 6 (union nut), which is also made of electrically non-conductive material, holds the inner nozzle 4 and the outer spray nozzle 5 together, with the interposed seal 20 preventing leakage , which covers the retaining ring 6 and consists of a very thin, electrically conductive material, the nozzle 5 is kept clean, the protective plate 11 is charged or energized

90981 9/0830

ORIGINAL INSPECTS)

With a low resistance, for example 100 to 150 Hegohm, the paint immediately hits back and covers the spray nozzle, if no protective plate is provided Resistance can only maintain its charge with difficulty · As a result, the nozzle 5 attracts the paint particles, which results in the paint coating on the nozzle · This disadvantage is eliminated according to the invention by the use of the protective plate, which in a self-regulating manner disturbs the electrostatic equilibrium between Nozzle 5 and paint particles prevent · The protective plate 11 repels the charged particles. Electrostatic field lines are formed to the object to be sprayed, which forms the positive pole.The sprayed paint particles follow these field lines, some of which extend behind the object to be sprayed, whereby the object, depending on its size and shape, is at least partially on top of it The rear side is sprayed The high-voltage cable 7 for supplying the electrostatic charge is inserted in an electrically insulated drill hole 12 which is integral with the spray body 2 The cable is in electrical contact with the nozzle needle 10 via a contact pin 13 and a guide bush 14

The paint is supplied through double, parallel channels 15 with connecting pieces 16. The paint channels 15 open into a tree between contact socket 14 and paint nozzle 4- · The paint circulates

9098 19/0830

OFÖGINAL PBPECTED

daljei resistant, so that there is no color in the event of interruptions The spray can settle in the pipes, furthermore the temperature of the paint is stable at the desired value held. The paint also circulates in the two channels 15 during the spraying, since more paint is supplied than sprayed The spray device according to the invention is mainly used used for heated paints to have a lower viscosity. With heated paint will be in several ways better results can be achieved, and the paint can also be supplied with lower pressure, at which the paint particles emerge from the nozzle at a lower speed, so that a more favorable electrostatic paint effect is achieved. The connecting channels 1> are formed in the body 3 in such a way that the circulation of the heated paint does not cause any lags or form silent angles through which it would be impossible to maintain a uniform temperature in all color particles. The paint is supplied and discharged via Hoohdruok hoses which are connected to the connection nipples 16.

In order to prevent the penetration of paint into the space that the central part 19 of the plunger receives, the nozzle needle 10 is effectively sealed by the sleeve 14 and the sealing material 17. The sealing material 17 and the sleeve 14 form So a stuffing hole for the nozzle needle 10

Although after the execution game the. Color using

909819/0830

IT ORIGINAL

hydrostatic pressure, the invention can also be implemented "in a device with paint atomization with the aid of compressed air · For example, the compressed air can be fed through a channel to the spray head 11, where a spray head provided with a compressed air supply is simply screwed on instead of the one shown _c

909819/0830

ORIGINAL INSPECTED

Claims (3)

Claims 1. Electrostatic paint spray device, which preferably works with hydrostatic or hydraulic pressure, with a grounded actuating part, preferably in the form of a handle and a spray body made of non-conductive Material that receives an actuating plunger with a nozzle needle with Torrlohtungen for supplying the color and for Connection of a high voltage cable and for charging the paint and atomizing the paint, characterized in that that forming an extension of the actuating plunger (3) The nozzle needle (10) is in galvanic contact with the high-voltage cable and with play in an inner one Spray nozzle (4) is used, the color being passed through and through the gray * formed by the game is electrostatically charged before it is atomized through the outer spray nozzle (5) 2, door direction according to claim 1, characterized in that the nozzle needle (10) ends in a tip, to increase the electrostatic charge by means of a tip effect and closing the nozzle (4) in the advanced position 3. Door direction according to claim 1 and 2, characterized in that that the outer spray nozzle (5) on the body (2) by means of a retaining ring (6) made of electrically insulating material is held, the front side by a plate ORIGINAL INSPECTED - ίο - electrically conductive material / is covered. 4 · "device according to at least one of claims 1 to 3, characterized in that the needle plunger (3) has a has central area (19) made of non-conductive material, which in the area of its ends with annular grooves for the use of O-rings are provided, the axially through the O-rings limited, the plunger part (19) surrounding annular space filled with a pressurized, insulating liquid is· 5 · Device according to claim 4t characterized in that an opening for supplying the insulating liquid through a screw plug (9) for applying pressure to the insulating liquid is lockable 9098 19/0830