DE1546876B1

DE1546876B1 - Spray gun

Info

Publication number: DE1546876B1
Application number: DE19611546876
Authority: DE
Inventors: D J Peeps
Original assignee: DeVilbiss Co
Current assignee: DeVilbiss Co
Priority date: 1960-08-30
Filing date: 1961-04-12
Publication date: 1970-08-27
Also published as: US3087682A; GB925099A

Description

1 21 2

Die Erfindung betrifft eine Spritzpistole mit Zer- um diese erst nach offnen der Abführungsöfrnung stäuberkopf und zwei je eine Spritzkomponente zu- der vorderen Kammer freizugeben, führenden Zuführungskanälen, die getrennt in zwei Vorzugsweise ist der Übergang in dem im Durchkonzentrisch zueinander angeordneten Kammern mit messer vergrößerten Teil des Nadelventils leicht in der Spritzpistole hintereinanderliegenden getrenn- 5 konisch ausgebildet.The invention relates to a spray gun with cereal only after the discharge opening has been opened to release the spray head and two spray components to the front chamber, leading supply channels, which are separated into two Preferably, the transition is in the through-concentric mutually arranged chambers with a knife-enlarged part of the needle valve slightly in the spray gun lying one behind the other separated 5 conically formed.

ten Austragsöffnungen münden, von denen wenig- Der Fluß der weniger zähen Komponente wirdth discharge openings open out, of which little- The flow of the less viscous component is

stens eine eine mit einem koaxial zu den Kammern zusätzlich auf Grund der Ausbildung des Nadelvengeführten Nadelventil verschließbare Öffnung auf- tils und der dazugehörigen Abführungskammer weist, und mit einer Mischkammer für beide Korn- verzögert.at least one one with one coaxial to the chambers in addition due to the formation of the needle veins Needle valve closable opening and the associated discharge chamber has, and with a mixing chamber for both grain delayed.

ponenten. io Es lassen sich vollkommen gleichmäßige Färb-components. io Completely even coloring

Bekannt ist eine Spritzpistole (deutsche Auslege- muster herstellen, obschon die Farbkomponenten schrift 1079 998), bei der ein Nadelventil die innere schwer miteinander mischbar sind und außerdem oder hintere der beiden Kammern abschließt und verschiedene Zähigkeiten aufweisen, also von vorngegebehenfalls die äußere oder vordere der beiden herein eine Gleichmäßigkeit des Musters gar nicht Kammern offenläßt bzw. durch eine besonders be- 15 erwartet werden kann.A spray gun is known (produce German layout samples, although the color components writing 1079 998), in which a needle valve, the inner ones are difficult to mix with each other and also or the rear of the two chambers and have different toughness, i.e. from the previous case the outer or front of the two does not have a uniformity of the pattern at all Leaves chambers open or can be expected from a particularly 15.

weglich gestaltete und dann düsenförmig zugespitzte Durch die erfindungsgemäße Ausbildung werdenCan be easily designed and then nozzle-shaped tapered by the inventive training

innere Kammer die äußere oder vordere Kammer die beiden konzentrisch zueinander angeordneten abschließt. . . ringförmigen Massen ein kleines Stück zusammeninner chamber the outer or front chamber the two arranged concentrically to one another concludes. . . annular masses a little bit together

Hier wird offensichtlich die Mischkammer unmit- vorgeführt. Dies dürfte eine nicht unwesentliche telbar in der Mündung der vorderen Kammer gebil- 20 Folge der erfindungsgemäßen Ausbildung sowie die det, die nicht hinreichend lang ist, um zwar misch- Voraussetzung für ein Gelingen der Auftragung eines bare, jedoch miteinander nichtreagierende Flüssig- Sprenkelüberzugs mit einer Spritzpistole durch eine keiten zu versprühen. Öffnung in einem einzigen Vorgang sein.The mixing chamber is obviously demonstrated here. This is likely to be a not insignificant one directly formed in the mouth of the anterior chamber 20 sequence of the training according to the invention as well as the det, which is not long enough to be mixed, a prerequisite for a successful application of a bare, but non-reactive liquid sprinkle coating with a spray gun through a to spray. Be opening in a single operation.

Es sollen nun bei einer Spritzpistole der bekannten Mit einer Vorrichtung nach der bekannten Spritz-It should now be with a spray gun of the known With a device according to the known spray

Art zwei Farben innerhalb der Spritzpistole mitein- 25 pistole wären demgegenüber nur große Farbflecken ander vermischt werden. Dies war bisher durch eine oder Kleckse zu erwarten, die alles andere als ein einzige Spritzpistole in einem einzigen Arbeitsgang wünschenswertes Aussehen ergeben, nicht zu lösen, da gleichzeitig eine begrenzte Ver- . Wird das erfindungsgemäße Nadelventil geschlosmischung, andererseits eine nicht zu starke Ver- sen oder leicht geöffnet und wird deshalb der von mischung erforderlich war. Trat eine zu starke Ver- 30 der Kammer gespeiste Strom der inneren Flüssigkeit mischung ein, so erfolgte Streifenbildung; bei extre- stark eingeschränkt und dadurch dieser Strom bei mer Vermischung wurde eine einzige Mischfarbe, erstmaliger Betätigung der Spritzpistole wesentlich die aus zwei völlig miteinander vermischten Kompo-. verringert, wenn das Nadelventil in seine vollgeöffnenten bestand, aufgetragen. nete Stellung gebracht wird, so schränkt der innereTwo colors inside the spray gun with one gun, on the other hand, would only be large patches of color mixed with each other. This was previously to be expected by one or by blobs that are anything but one a single spray gun gives a desirable appearance in a single operation, not to be solved, because at the same time a limited ver. If the needle valve according to the invention is closed, on the other hand, a not too strong forgiveness or slightly opened and therefore becomes that of mixture was required. If there was an excessive flow of internal fluid fed into the chamber Mixing in, this is how banding took place; at extremely limited and therefore this current at Mer mixing became a single mixed color, the first time the spray gun was used, it was essential the two completely mixed compo-. decreases when the needle valve is in its fully open existed, applied. is brought into a proper position, the inner one restricts

Weiter sollen dagegen bei einer einzigen Spritz- 35 Teil des Ventils den Fluß der inneren Flüssigkeit pistole zwei Farbaufträge vorgenommen werden, bei nicht sehr stark ein, so daß die beiden Flüssigkeiten denen die eine Farbe auf der anderen ein regelmäßi- in gewünschter Weise fließen, wenn sich das Ventil ges Muster bilden soll. Im allgemeinen werden Far- einmal in seiner normalen Arbeitsstellung befindet, ben benutzt, die zwar miteinander mischbar sind, Bevor jedoch die vollgeöffnete Stellung erreicht wird, miteinander jedoch nicht reagieren, wenn sie gemischt 40 wird der Fluß der inneren Flüssigkeit eingeschränkt, werden, denn sonst wäre das gewünschte Muster so daß bei Zuführung der niedriger viskosen der beiüberhaupt nicht,erzielbäi., den Flüssigkeiten durch die Kammer die schwerereFurthermore, in the case of a single injection part of the valve, the flow of the internal liquid should be controlled gun two coats of paint are made, with not very strong one, so that the two liquids which one color on the other a regular flow in the desired manner when the valve is should form a pattern. In general, once in its normal working position, Far- ben used, which can be mixed with each other, but before the fully open position is reached, but do not react with each other, if mixed 40 the flow of the inner liquid is restricted, because otherwise the desired pattern would be so that when the lower viscosity is added the at all not, achievable, the liquids through the chamber the heavier

Ein Hauptproblem bei der Herstellung solcher oder höher viskose Flüssigkeit Gelegenheit erhält, Anstriche ist auch in der verhältnismäßig schnell anfangs schneller als die dünnere Flüssigkeit zu eintretenden Entmischung beider Spritzkomponenten 45 fließen als sonst möglich wäre. Auf diese Weise wird zu sehen. Diese Entmischungstendenz verlangt eine selbst bei erstmaliger Öffnung des Spritzpistolenvenverhältnismäßig lange Mischkammer, um überhaupt tils ein gleichmäßiges Verspritzen erzielt, das gewünschte Farbmuster erzielen zu können, Beispielsweise Ausführungsformen der ErfindungA major problem in the production of such or higher viscosity liquids is the opportunity Painting is also relatively quick to begin with, faster than the thinner liquid too occurring separation of the two spray components 45 flow than would otherwise be possible. That way will to see. This tendency to segregate requires proportionally even when the spray gun valve is opened for the first time long mixing chamber in order to achieve even spraying at all, to be able to achieve the desired color pattern, for example embodiments of the invention

andererseits auch eine möglichst kurze Mischkammer, sollen nun an Hand der Zeichnungen näher erläutert damit der Inhalt dieser Mischkammer, wenn er sich 50 werden, in denenon the other hand, a mixing chamber that is as short as possible will now be explained in more detail with reference to the drawings so that the contents of this mixing chamber when it turns 50 in which

entmischt, möglichst gering ist und dadurch nur F i g. 1 eine Seitenansicht teilweise im Schnitt einersegregated, is as small as possible and therefore only F i g. 1 is a side view partly in section of a

kleine Farbverluste im Ergebnis auftreten. Da nun Spritzpistole, auf welche die erfindungsgemäße Ausandererseits die verschiedenen Fähigkeiten der Far- .. bildung anwendbar ist,small color losses occur in the result. Since now the spray gun on which the invention on the other hand the various skills of far- .. education is applicable,

ben dazu führen, daß die zähere Farbe zumindest Fig. 2 die erfindungsgemäße Ausbildung imben lead to the fact that the tougher color at least Fig. 2, the inventive training in

Anfangs schwerer fließt als die demgegenüber weni- 55 Schnitt und im Durchmesser der Abführungskammer ger zähe der beiden Spritzkomponenten, so treten bei in geschlossener Stellung gezeichnetem Nadeldie Auswirkungen dieser Probleme noch stärker ventilkörper undAt first it flows more heavily than the less than the section and diameter of the discharge chamber If the two injection components are more viscous, when the needle is drawn in the closed position, the Effects of these problems even stronger valve body and

hervor. Fig. 3 eine der Fig. 2 ähnliche Schnittansicht,emerged. 3 shows a sectional view similar to FIG. 2,

Erfindungsgemäß sollen nun die oben heraus- bei der jedoch das mit einem Absatz versehene gestellten und sich teilweise widersprechenden For- 60 Nadelventil in voll geöffneter Stellung veranschauderungen in einer einzigen Spritzpistole verwirklicht licht ist.According to the invention, the above should now be the one provided with a paragraph and sometimes contradicting each other realized in a single spray gun is light.

werden. Gemäß den Zeichnungen, insbesondere gemäßwill. According to the drawings, in particular according to

Diese zeichnet sich aus durch ein Nadelventil mit Fig. 1, ist eine Spritzpistole mit 10 bezeichnet. Die einem im Durchmesser vergrößerten Schaftteil, des- Spritzpistole 10 besteht aus einem Pistolenkörper 12, sen Durchmesser mit dem Durchmesser der Abgabe- 65 der eine mit einer Mehrzahl von Verteilerluftöffnunöffnung nahezu übereinstimmt, wobei das Nadel- gen 16 versehene und eine ringförmige Luftöffnung ventil in geschlossener Stellung durch die Abfüh- 18 aufweisende Spritzkammer 14 trägt. Diesen Öffrungsöfinung ragt und die hintere Kammer abschließt, nungen wird Luft aus einer geeigneten Quelle überThis is characterized by a needle valve with FIG. 1, a spray gun is designated with 10. the a shaft part of enlarged diameter, the spray gun 10 consists of a gun body 12, sen diameter with the diameter of the discharge 65 the one with a plurality of distribution air openings almost coincides, the needle gene 16 provided and an annular air opening valve in the closed position through the discharge 18 having spray chamber 14 carries. This opening opening protrudes and closes the rear chamber, air from a suitable source is passed over

INSPECTEDINSPECTED

Claims

3 43 4

a flexible hose to a spout 20 and a lower possibility of the two liquids Via an inlet channel 22 to which the annularity is obtained, to mix and in the case of non-shaped At the end of a valve seat 26 using the spray gun to seal it off. Self til 24, which by means of one of one on the body 12 at when weaning occurs, a lot settles 32 movably articulated pushers 30 operated .5 much smaller amounts than in the conventional

Rod 28 is operated, and from there via a spray gun, both liquids on the return channel 34 supplied. When the valve 24 is open, feed side of the chamber.

the air through a channel 34 via the openings 36 If the chamber 92 is sufficiently short, it can be fed into a cylinder 38 and through a longitudinally extending into the spray gun together with the channel 40. From the channel 40 the air flows inside Channel 88 forming tube through the outer through an annular manifold tube 42, an annular channel 86 insert. Otherwise, the chamber 44 and a plurality of highly restricted mer 92 and the pipe or channel 88 are assembled according to their channels 46 to the openings 16 and 18. Of course, attachment in the chamber 50, for example, can be assembled by any other appropriate air control screw,
system replace the system described above. 15 According to FIGS. 2 and 3, the here shown

The paint liquid is a modified embodiment of a cam body provided by the spray gun 12 and the cap 14 via a central opening 98 according to the invention, especially for injection 48 from one behind this and essentially zen of two liquids with different visconentric to the spray gun body arranged cosities, with the liquid with the lower Liquid chamber 50 discharged. The fluid viscosity is fed through the inner channel, The chamber 98 corresponds to the chamber 92 through controlled an elongated needle valve 52, which eventually their rear opening 100 and through the from one at the rear of the chamber to a discharge port 102 that match-50 The packing screw 56 located on the retaining veins have a diameter. The chamber 98 plastic pack 54 protrudes. The rod runs through a 25 det as in FIG. 1 through the opening 90 into the channel Opening 58 in pusher 30 up to an enlarged 88. A valve rod 104 protrudes through chamber 98 cylindrical stop 60, on which the trigger and has an enlarged part 106 and a 30 is supported when he is on to retract the valve end portion 108 reduced by a shoulder. rod 52 and pressed to release the opening 48, the needle valve 104 is in its is closed. The cylindrical stop 60 protrudes into a position as shown in FIG. 2, the protrudes Bushing 62, the stop 60 touching and enlarged part 106 through both openings 100 and the valve rod 52 to the liquid-tight seal 102 and thereby closes the interior of the chamber 98 The spring 64 bracing with the opening 48 essentially drops away from the liquid chamber 50. closes. A cap 66 is on the end of the sleeve when the needle valve 104 is opened through its closing 62 unscrewed and can lead back inwards and outwards 35, the enlarged part 106 is removed to change the compression of the spring 64 from the discharge opening 102 until it is full and to limit rearward movement of the open position (Fig. 3) when fully retracted Valve 52 are screwed. Has reached the handle and leaves the discharge opening

The paint liquid becomes relatively free in the liquid chamber 102 for the passage of the inner one

mer 50 from separate pressure vessels 68 and 70 40 liquid from the inner channel 88. If that

via flexible remote end 108 of the valve 104 connected via a fitting 80 from the

Hoses 72 and 74 supplied. The flow is moved out of the fluid opening 48, so that remains

controlled by hand. The liquid in channel 76 discharge opening 102 of chamber 98 essentially

flows through an outer channel 86 in the spray borrowed restricted until a further open point

Pistol body 12 and from there into the rear 45 l ^un g ^de s valve 104 has been reached. Through this

Part of the chamber 50. The liquid in the channel 78 can be the external liquid, for example the

flows through a concentric channel 86 which is more viscous of the two liquids, initially

arranged inner channel 88, which flow at an opening, while the inner, less viscous liquid

Opening 90 in a liquid chamber 92 is also connected by the larger part 106 of the valve

sen is. 50 104 remains reduced. If desired, the

The liquid chamber 92 according to the invention inwardly offset part of the valve 104 somewhat

is concentric and coaxial to the chamber 50 and designed conically instead of, as shown,

will be sharply set off in this position by means of the laterally protruding. The appropriate ratio of

held by the fins or ribs 93. The chamber diameter of parts 106 and 108 also depends

has a rear opening 94 through which 55 of the relative viscosities of the two are used

the needle valve body 52 is passed through tightly fluids.

and a discharge opening 96 in the front part of the patent claims
Chamber 92, through which liquid over the

Hose 74 and channels 78 and 88 in the direction of 1. Spray gun with atomizer head and two

flows out onto the opening 48. This inner liquid - 60 each supplying a spray component

In this way the speed is distinguished from the other by the ducts, which are separated into two concentrically

Channel 86 in the direction of the opening 48 flowing mutually arranged chambers in the

Liquid separated, flows essentially concen- trated

tric to this and thus reduces the outlet openings open out, of which few-

layering to a minimum. Because of the 65 at least one one with a coaxial to the chambers

Length of the chamber 92, the two liquids are guided by a needle valve with closable opening

also in the chamber 50 at a closer to the voltage, and with a mixing chamber

Liquid opening point separated, for which both components are marked

through a needle valve (104) with an im Diameter of enlarged shaft part (106), the diameter of which corresponds to the diameter of the discharge opening (102) almost coincides, with the enlarged shaft part (106) of the needle valve in the closed position protrudes through the discharge opening and the rear (98) of the two Chambers (50; 98) closes this only after opening the discharge opening (48) of the front Release chamber (50).

2. Spray gun according to claim 1, characterized in that the transition into the im Diameter enlarged part (106) of the needle valve (104) is slightly conical.

1 sheet of drawings