Nozzle Assembly

Abstract

The present invention relates to a nozzle assembly (1) comprising a conduit assembly (2) having an outer conduit (3) for guiding a gaseous medium and an inner conduit (9) arranged in the outer conduit (3) for guiding a medium to be sprayed, and a nozzle base (8) having at least one nozzle (7) connected to the conduit assembly (2) on the outlet side (6), wherein a connecting element (39) is arranged on the inner conduit end section (38) on the outlet side of the inner conduit (9) and on the nozzle base (8), in each case, where one connecting element (39) is formed as a first connecting element (39a) and one connecting element (39b) is connected to a second connecting element ( The nozzle assembly (1) is configured as a connecting head (41) pierced by a connecting head passage system (40), and the second connecting element (39b) is configured as a receiving bush (43) having an receiving space (42), whereby, in an assembled state of the nozzle assembly (1), the inner duct (9) is connected to the nozzle base (8) and the medium to be sprayed can flow from the inner duct (9) in the direction of the at least one nozzle (7).

Description

[Technical Field]

[0001] The present invention relates to a nozzle assembly comprising a conduit assembly having an outer conduit for guiding a gaseous medium and an inner conduit arranged in the outer conduit for guiding a medium to be sprayed, and a nozzle base having at least one nozzle connected to the conduit assembly on the outlet side, wherein one connecting element is arranged on the inner conduit end section on the outlet side of the inner conduit and on the nozzle base, one connecting element being configured as a first connecting element and one connecting element being configured as a second connecting element, so that the connecting elements can be connected to each other via a plug-in connection. [Background technology]

[0002] Nozzle assemblies are already known from the prior art.

[0003] EP 1871534 discloses a spray nozzle for a fluidized bed apparatus having a central liquid outlet for a liquid coating agent and an annular air outlet for coaxially supplying atomizing air, the annular air outlet being defined by a cover that can be held on the wall, particularly the bottom, of the housing of the fluidized bed apparatus, the cover having a central bore and connected to a supply source for atomizing air via an air pipe, an axially slidable nozzle head being centrally supported within the cover, the central liquid outlet being formed within the nozzle head, the nozzle head contacting an axial stop within the central bore, the nozzle head being connected to the supply source for the liquid coating agent via a liquid pipe, the liquid pipe having a flexible pipe section in the region of the bend and guided centrally within the air pipe, the liquid pipe being axially slidably supported in a closure within the air pipe.

[0004] German Patent Application Publication No. 102016122133 discloses a conduit assembly for a spray nozzle assembly, which has both a flexible inner conduit and a flexible outer conduit. The spray nozzle assembly further comprises a nozzle head and a connecting piece, which is adjusted to be pressed into a nozzle head holder and into a connecting piece of a processing module. A jacket tube of the processing module, which can accommodate the conduit assembly, extends between the connecting piece and the connecting piece. This allows the entire conduit assembly to be positioned very accurately at the point of use, especially without any adjustment work on the nozzle head.

[0005] A disadvantage of the nozzle assemblies shown in the prior art is that the connection between the inner conduit and the nozzle base is configured as a hose-connection piece combination, which only allows connection or disconnection after disassembly of the nozzle assembly. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] European Patent No. 1871534 [Patent Document 2] German Patent Application Publication No. 102016122133 Summary of the Invention [Problem to be solved by the invention]

[0007] SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a nozzle assembly that overcomes the shortcomings of the prior art. [Means for solving the problem]

[0008] This problem is solved by a nozzle assembly of the type mentioned at the beginning, in which the first connecting element is configured as a connecting head pierced by a connecting head passage system and the second connecting element is configured as a receiving bush with a receiving space, so that in the assembled state of the nozzle assembly, the inner duct is connected to the nozzle base and the medium to be sprayed can flow from the inner duct towards the at least one nozzle. Due to this configuration of the first and second connecting elements, the nozzle assembly can be coupled and uncoupled even in the assembled state.

[0009] In one advantageous refinement of the nozzle assembly in this regard, the first connecting element is arranged on the end section of the inner conduit and the second connecting element is arranged on the nozzle base. Arranging the first connecting element corresponding to the inner conduit end section and the second connecting element corresponding to the nozzle base allows for a less complex and therefore more cost-effective construction of the nozzle assembly.

[0010] Furthermore, the receiving space is defined by the receiving bush wall and the receiving bush bottom.

[0011] According to an advantageous configuration of the nozzle assembly, the connecting head passage system has an inlet passage with a longitudinal axis that merges in a transition region into a plurality of outlet passages that open onto the outer circumferential surface of the connecting head. In particular, the outlet passages are arranged at an angle to the longitudinal axis of the inlet passage and / or the outlet passages are arranged evenly distributed around the periphery of the connecting head. This arrangement of the outlet passages advantageously allows the medium to be sprayed to be delivered to the nozzles arranged in the nozzle base.

[0012] Preferably, each outlet passage has an outlet passage cross-sectional area that is a fraction of the inlet passage cross-sectional area. Therefore, the outlet passage has a sieve function by retaining coarse contaminants entrained in the medium to be sprayed based on the outlet passage cross-sectional area, which is a fraction of the inlet passage cross-sectional area. These contaminants would clog the nozzles arranged in the nozzle base. If the outlet passages of the connecting head passage system are clogged with large contaminants, the inner pipe together with the connecting head can be easily removed and replaced, even during the process, without the need to disassemble the nozzle assembly. Particularly preferably, each outlet passage has an outlet passage cross-sectional area that is smaller than the nozzle outlet cross-sectional area. This additionally ensures that contaminants not retained by the outlet passage can pass unimpeded through the nozzle outlet and do not get caught in the nozzle or, in the worst case, clog the nozzle.

[0013] In a further advantageous embodiment of the nozzle assembly, the connecting head has a connecting head mounting device for the inner line, which is expediently configured as a connecting head mounting sleeve with an internal thread or a first locking element. The connecting head mounting device is preferably pierced by the connecting head passage system. Via such a connecting head mounting device, the inner line can be easily and permanently connected to the connecting head and can be circulated with the medium to be sprayed.

[0014] In an advantageously improved nozzle assembly, the connecting head has a cap element fitted onto the connecting head mounting sleeve, which expediently passes through the connecting head mounting device on its rear side via the connecting head connecting piece. The cap element fitted onto the connecting head mounting sleeve allows the first connecting element formed as the connecting head to be optimally matched to the second connecting element formed as a receiving bush. Furthermore, the connecting head connecting piece further improves and permanently fixes the connection of the inner line to the connecting head. Preferably, the connecting head connecting piece is coaxially surrounded by the connecting head mounting device, expediently by the connecting head mounting piece, and even more preferably, the inlet passage is coaxially surrounded by the connecting head connecting piece. Furthermore, a space is formed between the coupling head connecting piece and the coupling head mounting sleeve, into which an inner pipe line having an external thread or a second locking element at its end section can be introduced, so that the internal thread or the first locking element of the coupling head mounting sleeve and the external thread or the second locking element of the inner pipe line are interlocked with each other, resulting in an easy and durable connection between the first coupling element formed as a coupling head and the inner pipe line.

[0015] In one additional advantageous refinement of the nozzle assembly, the first connecting element configured as a connecting head has a connecting head sealing element that seals between the first connecting element and the second connecting element in the assembled state, so that the connecting head and the receiving bush define a distribution space, and the connecting head expediently has a connecting head groove over its entire circumference for receiving the connecting head sealing element. The connecting head sealing element advantageously allows the medium to be sprayed to flow out of the distribution space exclusively in the direction of the nozzle.

[0016] In one particularly advantageous configuration of the nozzle assembly, the nozzle base is penetrated by a first nozzle base passage system for the gaseous medium and a second nozzle base passage system for the medium to be sprayed, so that the corresponding media can be led separately from each other through the conduit assembly to the nozzles. For this purpose, the first nozzle base passage system has at least one nozzle base supply line corresponding to the number of nozzles arranged on the nozzle base, so that the gaseous medium can be led to each nozzle. Preferably, two nozzle base supply lines are assigned to each nozzle. The advantage of this configuration is that a better air distribution for spraying the medium to be sprayed is ensured at the nozzle outlet of the nozzle. The second nozzle base passage system has a number of nozzle base supply lines corresponding to the number of nozzles arranged on the nozzle base, so that the medium to be sprayed can be led to each nozzle. Preferably, the nozzle base supply lines of the second nozzle base passage system connect the distribution space to each nozzle. Both nozzle base channel systems ensure a very simple and maintenance-free supply of the gaseous medium to be atomized to the nozzle base.

[0017] The nozzle base is preferably formed in two parts, and the nozzle base cover and the nozzle base pot are suitably connected to each other by a bayonet fastener or a screw thread. The connection and fixing of the nozzle base cover and the nozzle base pot are therefore achieved by a rotational insertion movement. The advantage of this connection is that the nozzle base cover and the nozzle base pot do not come apart even in the event of mechanical shock, so that the nozzle is not disconnected from the media supply, despite the easy and quick exchange of the nozzle base pot.

[0018] In an additional advantageous development of the nozzle assembly, the inner pipe arranged within the outer pipe has a flexible inner pipe section, which is expediently guided within the outer pipe by at least one spacer. In this regard, the flexible inner pipe section is preferably arranged in the region of the bend of the pipe assembly. The spacer ensures that the inner pipe is always positioned at the desired position within the outer pipe. Preferably, the inner pipe arranged within the outer pipe is coaxially surrounded by the outer pipe. Particularly preferably, a preload is applied to the flexible inner pipe section, so that the first connecting element is held within the second connecting element. In this regard, the preload is particularly generated by a spring force within the flexible inner pipe section.

[0019] According to an additional advantageous refinement of the nozzle assembly, a connecting piece is connected to the pipeline assembly on the supply side, which allows a simple and uncomplicated connection of the pipeline assembly to an existing pipeline network.

[0020] The invention will now be described in more detail with reference to the accompanying drawings. [Brief explanation of the drawings]

[0021] [Figure 1] FIG. 1 illustrates a top view of one embodiment of a nozzle assembly. [Figure 2] 2 is a cross-sectional view of the nozzle assembly taken through the section plane AA shown in FIG. 1. [Figure 3] FIG. 3 is an enlarged view of portion B of the nozzle assembly shown in FIG. 2. [Figure 4] FIG. 1 illustrates an embodiment of a nozzle assembly from below. [Figure 5] FIG. 10 shows a front view of a flexible inner duct section with a connecting head. [Figure 6] 6 is a cross-sectional view of the flexible inner conduit section taken through the cutting plane CC shown in FIG. 5. [Figure 7] FIG. [Figure 8]8 is a cross-sectional view of the coupling head taken through the cutting plane DD shown in FIG. 7; DETAILED DESCRIPTION OF THE INVENTION

[0022] FIG. 1 illustrates a top view of one embodiment of a nozzle assembly 1.

[0023] The nozzle assembly 1 shown in Figure 1 comprises a conduit assembly 2 having an outer conduit 3 for guiding a gaseous medium. A connection piece 5 is connected to a supply side 4 of the conduit assembly 2, while a nozzle base 8 having at least one nozzle 7 is connected to an outlet side 6 of the conduit assembly 2 opposite the supply side 4.

[0024] FIG. 2 shows a cross-sectional view of the nozzle assembly 1 through the cutting plane AA shown in FIG.

[0025] The conduit assembly 2 has an outer conduit 3 for guiding a gaseous medium, and an inner conduit 9 for guiding a medium to be atomized, which is arranged within the outer conduit 3. An annular gap 85 is formed between the outer conduit 3 and the inner conduit 9, which serves as an outer conduit flow path 84. The inner conduit 9, which is arranged within the outer conduit 3 and forms an inner conduit flow path 86, is coaxially surrounded by the outer conduit 3 in the embodiment shown.

[0026] The inner conduit 9 is formed in multiple sections. The inner conduit 9 thus comprises a rigid inner conduit section 10, preferably a straight tube made of a metallic material, and a flexible inner conduit section 11 connected to the rigid inner conduit section 10, preferably formed as a fabric-reinforced silicone hose or Guttasyn hose. The rigid inner conduit 10 is held within the outer conduit 3 by a connecting piece 5 at the supply side 4 of the conduit assembly 2, and is connected to a connecting element 13 at the side 12 of the rigid inner conduit 10 opposite the supply side 4. The flexible inner conduit section 11 is connected to the connecting element 13 at the supply side and to the nozzle base 8 at the outlet side 6 of the conduit assembly 2.

[0027] The outer conduit 3 of the conduit assembly 2 is provided with a mounting flange 14, which is arranged in an assembly plane CC oriented perpendicular to the section plane AA in a conically shaped outer jacket section 15 of a treatment module (not shown in detail), shown by way of example only in FIG. 2. In the treatment module, the illustrated embodiment of the nozzle assembly 1 is used in particular to form a top spray. The treatment module is preferably configured as a coating device, such as a drum coater, or as a fluidization device, such as a fluidized bed or spouted bed device.

[0028] The connection piece 5 has a double flange 16 forming a double flange flow passage 87, the outlet flange 17 of which is connected to an outer pipe end section flange 19 arranged on the supply-side outer pipe end section 18 so that the inner pipe 9 and the outer pipe 3 of the pipe assembly 2 are sealed at the supply side 4. For this purpose, the flange 17 and the outer pipe end section flange 19 are axially clamped together by a clamping device 21 formed as a tri-clamp. In addition to the double flange 16, the connection piece 5 further has an inner pipe connection piece 23 forming an inner pipe section flow passage 88 with an outlet-side inner pipe connection piece flange 22. The inner pipe connection piece flange 22 is connected to a supply-side flange 24 of the double flange 16 and is axially clamped together by a clamping device 26 formed as a tri-clamp 25, so that the double flange 16 extending the inner pipe 9 of the pipe assembly 2 is sealed at the supply side 4 of the pipe assembly 2. In this regard, the inner conduit channel 86 is fluidically connected to a double flange channel 87 and to an inner conduit connecting piece channel 88 .

[0029] The inner pipe connecting piece 23 has a connecting piece connection 27 for supplying the medium to be sprayed, preferably a liquid, dispersion, emulsion or suspension, and a connecting piece connection 28 for supplying a cleaning medium, suitably configured as cleaning air. The described design of the connecting piece 5 allows for a very simple exchange of the inner pipe connecting piece 23, which allows for an efficient exchange of the connecting pieces 27, 28.

[0030] The outer pipe 3 is connected to a connecting piece 29 onto which an outer pipe connector (not shown) can be slipped on. A pressurized gaseous medium, suitably atomizing air, can be supplied via the outer pipe connector.

[0031] On the outlet side, the outer and inner ducts 3 and 9 are connected to a two-part nozzle base 8, with the outer duct 3 connected to a nozzle base cover 30 and the inner duct 9, preferably a flexible inner duct element 11, connected to a nozzle base pot 31. The nozzle base cover 30 and the nozzle base pot 31 are connected to each other by a bayonet fastener, which is sealed by sealing elements 33a and 33b formed as ring seals 32a and 32b. The sealing elements 33a and 33b are respectively arranged in corresponding grooves 34a and 34b on the nozzle base cover 30 or the nozzle base pot 31. In an embodiment not shown, the connection between the nozzle base pot 31 and the nozzle base cover 30 is formed by a thread, with the nozzle base cover 30 preferably having an external thread and the nozzle base pot 31 having an internal thread.

[0032] The deflection of the medium from the horizontal mounting plane CC to the vertical spraying plane DD required for top spraying is carried out in the region of the bend 35 of the pipe assembly 2, which, in particular in the illustrated embodiment, is formed by a 90° pipe bend 36.

[0033] In the region of the bend 35, the inner pipe 9 arranged in the outer pipe 3 has a flexible inner pipe section 11 which, as shown in the present embodiment, is expediently guided in the outer pipe 3 by spacers 37. In this embodiment, three spacers 37 are used.

[0034] 3 shows an enlarged view of part B of the nozzle assembly 1 shown in FIG. 2. The nozzle base 8 is connected to the outer conduit 3 by a nozzle base cover 30, in particular by welding. Furthermore, the nozzle base 8 is removably connected to the inner conduit 9 by a nozzle base cover 31. For the removably connecting the inner conduit 9 to the nozzle base 8, a connecting element 39 is arranged on the inner conduit end section 38 on the outlet side of the inner conduit 9 and on the nozzle base cover 31. In this regard, one connecting element 39 is formed as a first connecting element 39a, and another connecting element 39 is formed as a second connecting element 39b, which can be connected to each other by a bayonet connection. In the illustrated embodiment, the first connecting element 39a is arranged on the inner conduit end section 38 of the inner conduit 9, and the second connecting element 39b is arranged on the nozzle base 8. A preload is applied to the flexible inner pipe section 11 of the inner pipe 9 in which the first connecting element 39a is arranged, so that the first connecting element 39a is fixed in position within the second connecting element 39b.

[0035] The first connecting element 39a is configured as a connecting head 41 pierced by a connecting head passage system 40, and the second connecting element 39b is configured as a receiving bush 43 having an receiving space 42, so that, in the assembled state of the nozzle assembly 1, the inner conduit 9 is connected to the nozzle base 8, preferably the nozzle base pot 31. This allows the medium to be sprayed to flow through the inner conduit channel 86 and the connecting head passage system 40 towards the three nozzles 7. In this embodiment, the receiving space 42 of the receiving bush 43 is defined by a receiving bush wall 44 and a receiving bush bottom 45.

[0036] The connecting head passage system 40 includes an inlet passage 46 having a longitudinal axis EE, which merges in a transition region 47 into multiple outlet passages 49 that open onto the outer circumferential surface 48 of the connecting head 41. In the illustrated embodiment, the multiple outlet passages 49 are arranged at an angle with respect to the longitudinal axis EE of the inlet passage 46. Furthermore, as can be better seen in FIG. 7 , the outlet passages are evenly distributed around the periphery of the connecting head 41. Furthermore, each outlet passage 49 has an outlet passage cross-sectional area 50 that is a fraction of the inlet passage cross-sectional area 51. The smaller outlet passage cross-sectional area 50 compared to the inlet passage cross-sectional area 51 creates a sieving effect that can filter out coarse contaminants in the medium to be sprayed. Furthermore, each outlet passage 49 advantageously has an outlet passage cross-sectional area 50 that is smaller than the nozzle outlet cross-sectional area 89 at the nozzle outlet 90 of the nozzle 7. This additionally ensures that any contaminants not retained by the outlet passage 49 can also flow unimpeded through the nozzle outlet 90 and be sprayed into the nozzle 7, particularly at the nozzle outlet 90, without getting caught or, in the worst case scenario, clogging the nozzle.

[0037] The coupling head 41 has a coupling head mounting device 52 for the inner line 9, which is expediently configured as a coupling head mounting sleeve 55 having a first locking element 54 with a locking projection 53. The coupling head mounting device 52 is pierced by the coupling head passage system 40, in particular by the inlet passage 46.

[0038] Furthermore, the coupling head 41 has a cap element 56 arranged on the coupling head mounting sleeve 55, which is threaded on its back side through the coupling head mounting device 52 by a coupling head connecting piece 57. The cap element 56 is preferably made of a plastic material known as PA2200 and is manufactured as a 3D component, particularly by laser sintering. PA2200, which is based on PA12, offers a wide range of possible applications. Furthermore, PA2200 meets all requirements for biocompatibility. In the illustrated embodiment, the coupling head connecting piece 57 is coaxially surrounded by the coupling head mounting device 52, particularly by the coupling head mounting sleeve 55. At the same time, the inlet passage 46 is also coaxially surrounded by the coupling head connecting piece 57.

[0039] Due to the structural design of the coupling head 41, a space 58 is formed between the coupling head connecting piece 57 and the coupling head mounting sleeve 55, into which space 58 the inner conduit 9 can be introduced, which has a second locking element 60 on the inner conduit end section 38 that forms a locking recess 59 for accommodating the first locking element 54, so that the first locking element 54 of the coupling head mounting sleeve 55 and the second locking element 60 of the inner conduit 9, in particular the flexible inner conduit section 11, are operatively connected. The coupling head 41 can also be connected to the inner conduit end section 38 on the outlet side of the inner conduit 9 using a different connecting technique, for example by means of a screw thread, in which case the coupling head mounting sleeve 55 has an internal thread and the inner conduit end section 38 of the inner conduit 9 has an external thread.

[0040] The first connecting element 39a, formed as a connecting head 41, has a connecting head sealing element 65 that, in the assembled state, seals between the first connecting element 39a and the second connecting element 39b, so that the connecting head 41 and the receiving bushing 43 define a distribution space 66. Expediently, the connecting head 41 has a connecting head groove 67 around its entire circumference for receiving the connecting head sealing element 65. The connecting head sealing element 65 is preferably formed as a ring seal 68. By introducing the medium to be sprayed into the distribution space 66, the medium is evenly distributed to the individual nozzles 7 arranged on the nozzle base 8.

[0041] To feed the medium provided via the conduit assembly 2 to the nozzle 7 arranged in the nozzle base 8 formed from two parts, the nozzle base 8 is pierced by a first nozzle base passage system 61 for the gaseous medium and a second nozzle base passage system 62 for the medium to be sprayed. It is thus ensured that the corresponding media can be led from the conduit assembly 2 to the nozzle 7 separately from each other.

[0042] The first nozzle base passage system 61 has at least one nozzle base supply line 63 corresponding in number to the number of nozzles 7 arranged in the nozzle base 8 for conducting the gaseous medium to each nozzle 7. In the illustrated embodiment, two nozzle base supply lines 63 are assigned to each nozzle 7. At the nozzle outlet 90 of the nozzle 7, the two nozzle base supply lines 63 ensure better air distribution for atomization of the medium to be sprayed. This also reduces possible deposition of the medium to be sprayed at the nozzle outlet. Therefore, the gaseous medium flows through the outer conduit flow path 84 via the nozzle base supply line 63 to the nozzle 7. The above-mentioned combination of all flow paths for the gaseous medium is also referred to as the outer flow path. The second nozzle base passage system 62 likewise has a number of nozzle base supply lines 64 corresponding in number to the number of nozzles 7 arranged in the nozzle base 8 for conducting the medium to be sprayed to each nozzle 7. The nozzle base supply lines 64 of the second nozzle base passage system 62 interconnect the distribution space 66 with the respective nozzles 7. Correspondingly, the medium to be sprayed flows through the inner conduit connecting piece passage 86, the double flange passage 87, the inner conduit passage 86 and the connecting head passage system 40 into the distribution space 66 and from this distribution space 66 via the nozzle base supply lines 64 to the nozzles 7. The above-mentioned combination of all passages for the medium to be sprayed is also called the inner passage. Thus, in this embodiment, the nozzle base 8 is penetrated by three nozzle base supply lines 63 and three nozzle base supply lines 64, respectively.

[0043] The nozzle base 8, here nozzle base pot 31, has three nozzles 7 as shown in the bottom view of the nozzle assembly 1 shown in Figure 4. Different numbers of nozzles are contemplated and possible, for example four, five, six or more.

[0044] FIG. 5 shows a front view of the flexible inner duct section 11 with the connecting head 41 .

[0045] The connecting head 41 is arranged on the inner conduit end section 38 of the inner conduit 9. Arranged coaxially around the flexible inner conduit section 11 are three spacers 37 with through openings 69. The through openings 69 allow the gaseous medium to flow largely unhindered through the outer conduit flow path 84 between the outer conduit 3 and the inner conduit 9 in the direction of the nozzle 7 arranged in the nozzle base 8.

[0046] A cross-sectional view of the flexible inner conduit section 11 through the cutting plane CC shown in FIG. 5 is shown in FIG.

[0047] As already explained in Figure 2, a connecting element 13 is arranged in the outer conduit 3 to connect the rigid inner conduit section 10 to the flexible inner conduit section 11. The connecting element 13 has a connecting element passage 70 which is arranged in correspondence with the inner conduit passage 86 and which passes through the connecting element 13 in the flow direction of the medium to be sprayed.

[0048] To connect the rigid inner pipe section 10 to the connecting element 13, the rigid inner pipe section 10 has an external thread 72 at its outlet end section 71, which threads into a connecting element passage section 74 having a lamina 73, whereby an internal thread (not shown) corresponding to the external thread 72 is cut into the lamina 73. The rigid inner pipe section 10 is thus fixed in position within the connecting element 13.

[0049] Furthermore, the coupling element 13 has a coupling element mounting device 77 for receiving the flexible inner pipe section 11, which is formed as a coupling element mounting sleeve 76 with an internal thread 75. This coupling element mounting device 77 is passed through by a coupling element connecting piece 78 of the coupling element 13. At the same time, an external thread 80 is arranged on a supply end section 79 of the flexible inner pipe section 11.

[0050] A space 81 is formed between the coupling element connecting pipe piece 78 and the coupling element mounting sleeve 76, into which a flexible inner pipe section 11 having an external thread 80 at its end section 79 can be introduced, whereby the internal thread 75 of the coupling element mounting sleeve 76 and the external thread 80 of the flexible inner pipe section 11 are interlocked with each other, and the flexible inner pipe section 11 is fixed in position within the coupling element 13.

[0051] The coupling element 13 can be coupled to the rigid inner conduit section 10 or the flexible inner conduit section 11, respectively, by different coupling techniques. Thus, for example, the coupling of the rigid inner conduit section 10 to the coupling element 13 and the coupling of the flexible inner conduit section 11 to the coupling element 13 can be established by a locking coupling.

[0052] Furthermore, the connecting element 13 has a through opening 83 in its outer region 82, which allows the gas medium to pass through the connecting element 13 positioned in the outer conduit 3 by flowing through the through opening 83 in the direction of the nozzle 7.

[0053] Figure 7 shows a side view of the coupling head 41, and Figure 8 shows a cross-section of the coupling head 41 through the cutting plane DD shown in Figure 7. In this case, a detailed description of Figures 7 and 8 has already been given above, but Figures 7 and 8 serve in particular to provide a better overview.

Claims

1. A nozzle assembly (1) comprising: a conduit assembly (2) having an outer conduit (3) for guiding a gaseous medium and an inner conduit (9) arranged in the outer conduit (3) for guiding a medium to be sprayed; and a nozzle base (8) having at least one nozzle (7) connected to the conduit assembly (2) on the outlet side (6), wherein a connecting element (39) is arranged on an inner conduit end section (38) on the outlet side of the inner conduit (9) and on the nozzle base (8), wherein one connecting element (39) is formed as a first connecting element (39a) and one connecting element (39) is formed as a second connecting element (39b), and the connecting elements (39) are connectable to one another via a plug-in connection.

1. A nozzle assembly (1), characterized in that the first connecting element (39a) is formed as a connecting head (41) pierced by a connecting head passage system (40), and the second connecting element (39b) is formed as a receiving bush (43) having a receiving space (42), so that in an assembled state of the nozzle assembly (1), the inner pipe (9) is connected to the nozzle base (8) and the medium to be sprayed can flow from the inner pipe (9) in the direction of the at least one nozzle (7).

2. 2. The nozzle assembly (1) according to claim 1, characterized in that the first connecting element (39a) is arranged on the inner pipe end section (38) of the inner pipe (9) and the second connecting element (39b) is arranged on the nozzle base (8).

3. 3. The nozzle assembly (1) according to claim 2, characterized in that the receiving space (42) is defined by a receiving bush wall (44) and a receiving space bottom (45).

4. 4. The nozzle assembly (1) according to claim 1, wherein the connecting head passage system (40) comprises an inlet passage (46) having a longitudinal axis (EE), the inlet passage (46) transitioning in a transition region (47) into a plurality of outlet passages (49) opening into an outer peripheral surface (48) of the connecting head (41).

5. A nozzle assembly (1) according to claim 4, characterized in that said plurality of outlet passages (49) are disposed at an angle relative to said longitudinal axis (EE) of said inlet passage (46).

6. Nozzle assembly (1) according to claim 4 or 5, characterized in that the outlet passages (49) are arranged uniformly distributed around the circumference of the connecting head (41).

7. 7. A nozzle assembly (1) according to any one of claims 4 to 6, characterized in that each outlet passage (49) has an outlet passage cross-sectional area (50) which is a fraction of the size of the inlet passage cross-sectional area (51).

8. Nozzle assembly (1) according to any one of claims 4 to 7, characterized in that each outlet passage (49) has an outlet passage cross-sectional area (50) smaller than the nozzle outlet cross-sectional area (89).

9. 9. The nozzle assembly (1) according to claim 1, wherein the connecting head (41) has a connecting head mounting device (52) for the inner pipe (9), which is expediently formed as a connecting head mounting sleeve (55) having an internal thread or a first locking element (54).

10. Nozzle assembly (1) according to claim 9, characterized in that said connecting head (41) comprises a cap element (56) fitted onto said connecting head mounting sleeve (55).

11. Nozzle assembly (1) according to claim 9 or 10, characterized in that the connecting head mounting device (52) is penetrated by the connecting head passage system (40).

12. Nozzle assembly (1) according to claim 10 or 11, characterized in that the cap element (56) is pierced on the rear side by the coupling head mounting device (52) by a coupling head connecting piece (57).

13. 13. The nozzle assembly (1) according to claim 12, characterized in that the coupling head connecting piece (57) is coaxially surrounded by the coupling head mounting device (52), expediently by the mounting head mounting sleeve (55).

14. Nozzle assembly (1) according to claim 12 or 13, characterized in that the inlet passage (46) is coaxially surrounded by the connecting head fitting (57).

15. 15. The nozzle assembly (1) according to any one of claims 12 to 14, characterized in that a space (58) is formed between the coupling head connecting piece (57) and the coupling head mounting sleeve (55), into which the inner conduit (9) having an external thread or a second locking element (60) at its inner conduit end section (38) can be introduced, whereby the internal thread or the first locking element (54) of the coupling head mounting sleeve (55) and the external thread or the second locking element (60) of the inner conduit (9) are operatively coupled to each other.

16. 16. The nozzle assembly (1) according to claim 1, wherein the first connecting element (39a) formed as a connecting head (41) has a connecting head sealing element (65) which seals between the first connecting element (39a) and the second connecting element (39b) in the assembled state, whereby the connecting head (41) and the receiving bush (43) define a distribution space (66), and the connecting head (41) expediently has a connecting head groove (67) around the entire circumference of the connecting head (41) for receiving the connecting head sealing element (65).

17. 17. The nozzle assembly (1) according to any one of claims 1 to 16, characterized in that the nozzle base (8) is penetrated by a first nozzle base passage system (61) for the gaseous medium and a second nozzle base passage system (62) for the medium to be sprayed, so that the corresponding media can be led from the pipe assembly (2) to the nozzle (7) separately from each other.

18. 18. The nozzle assembly (1) according to claim 17, characterized in that the first nozzle base passage system (61) has at least one nozzle base supply pipe (63) in a number corresponding to the number of the nozzles (7) arranged in the nozzle base (8), by means of which the gaseous medium can be led to each of the nozzles (7).

19. 19. The nozzle assembly (1) according to claim 17 or 18, characterized in that the second nozzle base passage system (62) has a number of nozzle base supply lines (64) corresponding to the number of the nozzles (7) arranged on the nozzle base (8), by means of which the medium to be sprayed can be led to each of the nozzles (7).

20. 20. The nozzle assembly (1) according to claims 16 and 19, characterized in that a nozzle substrate supply line (64) of a second nozzle substrate passage system (62) connects the distribution space (66) with each of the nozzles (7) to each other.

21. 21. The nozzle assembly (1) according to claim 1, wherein the nozzle base (8) is formed from two parts, and the nozzle base cover (30) and the nozzle base pot (31) are suitably connected to each other by a bayonet fastener or a screw thread.

22. 22. The nozzle assembly (1) according to claim 1, wherein the inner pipe (9) arranged in the outer pipe (3) has a flexible inner pipe section (11), which is expediently guided in the outer pipe (3) by at least one spacer (37).

23. Nozzle assembly (1) according to claim 22, characterized in that the flexible inner line section (11) is arranged in the region of a bend (35) of the line assembly (2).

24. 24. The nozzle assembly (1) according to claim 22 or 23, characterized in that the flexible inner pipe section (11) is preloaded, whereby the first connecting element (39a) is held within the second connecting element (39b).

25. 25. The nozzle assembly (1) according to any one of claims 1 to 24, characterized in that the inner pipe (9) arranged within the outer pipe (3) is coaxially surrounded by the outer pipe (3).

26. Nozzle assembly (1) according to any one of the preceding claims, characterized in that a connection piece (5) is connected to the line assembly (2) on the supply side (4).

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