DE8905306U1 - Spray head for generating an air-liquid mixture - Google Patents

Description

DIPL.-INC. P.-C. SROKA. dr. H. FEDER, dipu-phys. dr. W.-D. FEDER PATENT ATTORNEYS & EUROPEAN PATENT ATTORNEYS

10

15

DOMINIKANERSTR. 37, P.O. BOX III038

D-4OOO DÜSSELDORF ü telephone (O2I1) 553402 telex 8584550 telefax (O21I) 57O3I6

HF/Mi Our File 89-20-17

Company JERKEL paint spraying equipment compressed air tecfrnik "mbH, Bataveretr. 74a, 4040 Neues 1

Spray head for generating an air-liquid mixture

miscellaneous.

The innovation concerns a spray head for producing an air-liquid mixture with a nozzle carrier body into which a liquid inlet '' chamber and a liquid supply line leading into a

Compressed air supply line opening into the air inlet chamber

and on which a mixing nozzle is arranged, with a mixing chamber that widens conically towards an outlet opening, which is connected to the Liquid inlet chamber and is connected to the air inlet chamber via several air supply channels that run through the mixing nozzle and form acute angles with the central axis of the mixing nozzle, whereby seen from the outlet opening, the cylindrical liquid inlet chamber is axially behind the mixing nozzle

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is arranged, while the annular air inlet chamber is arranged surrounding the mixing nozzle in front of the liquid inlet chamber.

Such a spray head is basically known and is described, for example, in DE-PS 3d 40 818.

With such spray heads, which can be used for spray cooling lubrication, for example, it is often desirable not only to adjust the direction of the spray cone precisely in a certain direction, but also to change this direction in a defined manner. For this purpose, the entire spray head had to be swiveled in known designs, which is complex due to the supply lines connected to the spray head and does not provide the desired accuracy of adjustment.

The aim of the innovation is to design a spray head of the type described above in such a way that the mixing nozzle is arranged in the nozzle carrier body so that it can pivot using a very simple construction.

This problem is solved according to the firing with the features from the characterizing part of claim 1. Advantageous further developments of the new spray head are described in the subclaims.

As explained in more detail below using an example, the innovation is based on the basic idea of mounting the mixing nozzle in the nozzle carrier body via a type of ball joint, whereby the problem was that in every position of the mixing nozzle the free passage of both the liquid and the compressed air from the liquid

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The flow of liquid from the liquid inlet chamber through the passage channel and from the air inlet chamber through the air supply channels must be ensured. The basic principle of the solution is that the ball joint has two spherically curved sealing surfaces, i.e. parts of a spherical surface, which have a common center on the central axis of the mixing nozzle, but have different radii. The first sealing surface with the smaller radius seals the liquid inlet chamber against the air inlet chamber directly adjacent to it, while the second sealing surface with the larger radius seals the air inlet chamber against the outside space. The different design of the radii of the two sealing surfaces saves so much space that an extraordinarily compact, space-saving design of the spray head is possible.

Embodiments of the spray head with one or more liquid supply lines are possible, whereby a check valve with an adjustable closing force is preferably provided in each liquid supply line. Different liquids can then be supplied to the spray head, whereby a specific liquid is supplied in each case by increasing the liquid pressure in the supply line as a result of the check valves. In this way, it is possible, for example, to supply different liquids alternately. Furthermore, this embodiment can also be used to supply liquid media that react with one another and therefore must only be mixed together at the last moment before spraying. Finally, with two or three liquid connections, a connection for supplying

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a cleaning agent, which can be of great advantage, especially when supplying rapidly hardening media or the alternating supply of media that react with one another.

Of course, it is also possible with the new spray head lu, as with the spray head known from DE-PS 36 40 818, to arrange the air supply channels in such a way that their axes lie in planes which are intersected by the central axis of the mixing nozzle at a point and each enclose a predetermined acute angle with this central axis, so that the compressed air jet which strikes the liquid jet from outside in the mixing chamber performs a rotating movement around the central axis of the mixing nozzle, thereby achieving excellent atomization of the liquid and uniform distribution of the liquid droplets over the cross section of the spray cone.

In the following, two embodiments of a spray head according to the innovation are explained in more detail using the attached drawings.

The drawings show:

Fig. 1 shows a spray head in a section through the central axis along the line I-I in Fig. 2;

Fig. 2 a top view of the spray head according to Fig. 1

with tears along the line II-II in

Fig.1;

Fig. 3 shows the spray head in a representation analogous to Fig. 1 with pivoted mixing nozzle;

Fig. 4 a section along the line IV-IV in Fig. 2

through the nozzle carrier body of the spray head

according to Fig* 1 with the mixing nozzle removed:

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• till t

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Fig. 5 is a section through the central axis of another embodiment of a spray head not

the line V-V in Fig. 6; Fig. 6 a section through the spray head according to Fig. 5

along the line VI-VI in Fig. 5;

Fi.·. / a top view of the spray head according to Fig. 5. 10

r\ ^- -J —— r-4 _M &Lgr; U -&iacgr; -» A W^„„„„4-„llV„ Cnr-if 7l/nnf K &ohgr;&ogr; . '&igr; t

LfC' XIf UOII &Ggr; X tj · J. U J. O "T UUXtJQdUa-L-LUU \j\J*.*.*j^.rwy**~ is ww _l . -j

a nozzle carrier body I ₁ into which a liquid supply line 2 with a connection 2.1 and a compressed air line 4 with a connection 4.1 are introduced. The Liquid supply line 2 opens into a cylindrical liquid inlet chamber 3 arranged on the central axis of the nozzle carrier body 1, while the compressed air supply line opens into a chamber 3 which is directly adjacent to the liquid inlet chamber 3 in the outlet direction and is also arranged on the central axis of the nozzle carrier body 1 arranged

Air inlet chamber 5 opens, which has a larger radius than the liquid inlet chamber 3.

Tn the nüRont.ränerknrriRr 1 is. where v/arrie a mixing nozzle

6 and through a in the nozzle carrier body 1 &igr; ) screwed-in clamping nut 10. As with

As can be clearly seen in Fig. 1, for example, the arrangement of the mixing nozzle 6 in the carrier body is such that its rear end on the one hand covers the liquid inlet chamber 3 closes and on the other hand is surrounded in a ring shape by the air inlet chamber 5. In order to achieve a pivotability of the mixing nozzle 6 in the nozzle carrier body i, two spherically curved sealing elements, i.e. designed as spherical surfaces, are provided on the outside of the mixing nozzle 6. surfaces. The first sealing surface 6.2 is arranged at the rear end of the mixing nozzle 6 so that it faces the open front end of the liquid inlet

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chamber 3 and rests against a correspondingly curved counter surface arranged in the area between the liquid inlet chamber 3 and the air inlet chamber 5 on the nozzle carrier body 1. The second sealing surface 6.3 is arranged in the middle area of the mixing nozzle ß so that it faces away from the ^liquid inlet chamber 3, i.e. in the outlet direction. It rests against the sealing surface 10.1 which is arranged on the inside of the clamping nut 11) with which the mixing nozzle 6 is held in the nozzle carrier body 1. Both sealing surfaces 6.2 and 6.3 have a common center point M located on the center axis m2 and the radius of the first sealing surface 6.2 is smaller than the radius of the second sealing surface 6.3. This difference in the radii has the advantage, as can be seen directly from Fig. 1, that the inner radius of the annular air inlet chamber 5 is smaller than the largest radius of the mixing nozzle 6 and thus the air inlet chamber 5 can be positioned close to the center axis m2 of the mixing nozzle 6, which leads to a particularly space-saving and compact design.

The mixing nozzle 6 is arranged in the nozzle carrier body 1 so that it can pivot via the two sealing surfaces S.2 and 6.3.

The mixing chamber 6.1 in the mixing nozzle 6, which widens conically towards the outside, is connected to the liquid inlet chamber 3 via a passage channel 7 which widens at its end facing the mixing chamber 6.1 and which passes through the first sealing surface 6.2. Furthermore, the mixing chamber 6.1 is connected to the liquid inlet chamber 3 via several acute angles with the central axis m2 of the mixing nozzle 6.

·■■ ···*

• I &igr;

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closing air supply channels 8 in the air inlet chamber 5. As can be seen from Fig. 1, the air supply channels 8 open into the air inlet chamber 5 in the area between the two sealing surfaces 6.2 and 6.3. In a manner not apparent from the drawings, the air supply channels 8 be guided obliquely through the body of the mixing nozzle 6 in such a way that their axes lie in planes which are intersected by the central axis m2 of the mixing nozzle at a point and form a predetermined acute angle with this central axis. The central axis m2 lies then in none of these levels.

As can be seen from Fig. 1 and 3, the mixing nozzle 6 can be pivoted into different positions by the ball joint described above, in which its central axis m2 encloses different acute angles with the central axis ml of the nozzle carrier body 1.

A check valve is arranged in the liquid supply line 2 which runs through the nozzle carrier body 1, whose design is shown in particular in Fig. 2 and 4 The check valve 9 has a ball 9.1 representing the valve cone, which is pressed against a valve seat 9.3 by the force of a coil spring 9.2. The preload of the coil spring 9.2 is adjustable by an adjusting screw 9. A and this The setting can be fixed using a grub screw 9.5. The preload of the check valve 9 set in this way determines the fluid pressure at which the check valve opens.

3ö The switching on of the fluid supply can thus be controlled solely by a different predetermined fluid pressure.

·· Mil Il Il ·· ·

• · · · » · · · ••old ·· » a · a a

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In Fig. 5 to 7 another embodiment of a spray head is shown, which differs from the embodiment according to Fig. 1 to 4 primarily in that several liquid supply lines are led into the nozzle actuator body. The remaining parts of this embodiment correspond to the first-mentioned embodiment.

Three liquid supply lines 12a, 12b and 12c are introduced into the nozzle carrier body 11 and open into the axially arranged liquid inlet channel 13. (To achieve a good arrangement of the three fluid connections 12.1 in the same direction on the nozzle carrier body 11, additional pieces 11.2 are screwed into the back of the nozzle carrier body 1, into which the fluid connections 12.1 are screwed. In All three fluid connections have a check valve 19 of the type already described in Fig. 1 to 4. The compressed air connection 14.1 is also located on an additional piece 11.3 screwed into the nozzle carrier body 11. The compressed air supply line 14 opens into the air inlet chamber 15, which is in the is designed and arranged in the same way as in the previously described design.

The mixing nozzle 16 is inserted into the nozzle carrier body 11 and has a first sealing surface 16.2 and a second sealing surface 16.3 in the manner already described. The first sealing surface 16.2 rests on the counter surface 11.1 arranged between the liquid inlet chamber 13 and the air inlet chamber 15, while the second sealing surface 16.3 rests on the counter surface 20.1 arranged on the clamping screw 20. This enables the mixing nozzle 16 to be pivoted in

• ·· #&igr;·&igr; t &igr; )* Il ■·

·· It··

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in the same way as in the previously described embodiment. The mixing chamber 16.1 is again connected to the liquid inlet chamber 13 via a passage channel 17 and to the air inlet chamber 15 via air supply channels 18.

The embodiment described in Fig. 5 to 7 enables different liquids to be supplied alternately or simultaneously to the mixing nozzle 16. The pre-tension set at the liquid valves 19 determines the flow pressure of the liquids. laid, which can also be chosen differently

Claims (6)

* I · » I I » I » t | I ··« > 1 » I I · f · 11,11 Il &igr; , , ,, 89-20-17 - 10 - Protection claims I 5 1. Spray head for producing an air-liquid mixture with a nozzle carrier body into which a Liquid inlet chamber, a liquid supply line opening into a liquid inlet chamber and a compressed air supply line opening into an air inlet chamber are led into it and on which a mixing nozzle is arranged with a nozzle opening into an outlet &aacgr; opening conically widening Mieshraum, the &psgr; \ via an axially guided through the mixing nozzle, in g its front section an extension widening ff 15 passage channel with the liquid inlet chamber and f~ via several, guided through the mixing nozzle, with the &igr; Center axis of the mixing nozzle specified acute angle I enclosing air supply ducts with the air in inlet chamber, whereby, viewed from the outlet opening, the cylindrical liquid inlet chamber is arranged axially behind the mixing nozzle, while the annular air inlet chamber surrounds the mixing ^nozzle and is arranged in front of the liquid inlet chamber. ,;" is arranged, characterized in that the liquid '<■: 25 air inlet chamber (3, 13) and the air inlet chamber p ) (5 , 15) immediately adjacent to each other in the nozzle carrier gerkörp^r (1, 11) are arranged and the mixing nozzle (6, 16) is pivotable and the two chambers (3 and 5, 13 and 15) against each other and the air inlet chamber (5, 15) : 30 is arranged in the nozzle carrier body (1, ' 11) in a sealing manner against the outside, in which it has on its outside two &bull;\ spherically curved sealing surfaces (6.2, 6.3; 16.2, 16.3) which have a common center point (M) 35 located on the center axis m2 of the mixing nozzle (6, 16), the first of the liquid inlet chamber (3, 13) facing sealing surface (6.2, 16.2) on a correspondingly curved, between liquid inlet O · ti · 89-20-17 - 11 - The first sealing surface (1.1, 11.1) facing away from the liquid inlet chamber (3, 13) is in contact with a correspondingly curved counter surface (10.1, 11.2) arranged between the air inlet chamber (5, 15) and the outside space on the nozzle carrier body (1, 11). 20.1) and the radius of the first sealing surface (6.2, 16.2) is smaller than the radius of the second sealing surface (6.3, 16.3). 2. Spray head according to claim 1, characterized in that a check valve (9) pre-tensioned by the force of a spring is arranged in the liquid supply line (2). 3. Spray head according to claim 1, characterized in that at least two liquid supply lines (12a, 12b, 12c) open into the liquid inlet chamber (13), with a check valve (19) prestressed by the force of a spring being arranged in each liquid supply line net is. 4. Spray head according to claim 2 or 3, characterized in that the preload force of each check valve is adjustable. 5. Spray head according to one of claims 1 to 4, characterized in that the axes of the air supply channels (8) lie in planes which are intersected by the central axis (m2) of the mixing nozzle (6) at a point and with this central axis each enclose a given acute angle. &bull;!&bull;tit III I I I I '' / 89-20-17 - 12 - 6. Spray head according to one of claims 1 to 5, characterized in that the counter surface (10.1, 20.1) for the second sealing surface (6.3, 16.3) is arranged on the inside of a clamping nut (10, 20) that can be screwed into the nozzle carrier body (1, 11) from the front for holding the mixing nozzle (6, 16). 10 * ■ IfVf &bull; · · t * ■ I III