Device for the coating of substrates by means of high-speed flame spraying.

[0001] The invention concerns a device for the coating of substrates by means of high-speed flame spraying in accordance with the generic term of the requirement 1.

Devices of the kind standing here to the speech are in most varied execution forms well-known and for most diverse purposes are used. They become for example for applying temperature-steady and/or hard and/or resistant to friction and/or chemically steady layers on surfaces of most diverse substrates eingesetzt.

From the conditions of the technology devices are well-known, those claimant with a gaseous fuel werden.

Admit are also devices, which can be operated with liquid fuel. Gattungsgemässe devices possess usually at least a connection for the fuel as well as a further for an oxidative gas. In particular with devices, which are operated with a liquid fuel, still another additional connection for the supply can be planned by compressed air. All however the disadvantage adheres to these well-known devices that their operational area limits ist.

The invention aims off to train a device further in such a manner in accordance with the generic term of the requirement 1 that these universally applicable ist.

For this a device becomes in accordance with the requirement 1 bereitgestellt.

after the invention Preferential execution forms of the device are in the dependent requirements 2 to 8 umschrieben.

In the requirement 9 is besides a nozzle body for after one of the requirements 1 to 8 trained device defined, during requirement 10 a preferential further training of the nozzle body beschreibt.

A preferential remark example of the invention becomes following on the basis of designs more near erläutert.

In these designs shows:

Fig. 1 Fig. 2 Fig. 3 Fig. 4 Fig.

Fig. 6a Fig. 6b Fig. 6c the device for the coating of substrates by means of high-speed flame spraying in an opinion from the rear; the device on average along the line A-A in Fig. 1; the device on average along the line B-B in Fig. 1; the device on average along the line CC in Fig. 1; the device on average along the line D-D in Fig. 1; a nozzle body in an opinion from the front; the nozzle body on average along the line A-A in Fig. 6a, and the nozzle body on average along the line B-B in Fig. 6a.

The Fig. 1 points the device to the coating of substrates by means of high-speed flame spraying in an opinion of the back. From this representation is evident that the device, in the following also burner is provided mentioned, on the back with a multiplicity of connections, over which on the one hand the media necessary for the enterprise of the burner be supplied can. Additionally a connection for a pressure sensor and a further for an ignition unit are intended. It understands itself that the number and arrangement of connections can vary. In the available example the ports A1 to A9 for the supply of the following media are intended: A1 liquid fuel, a2 oxygen, A3 oxygen optionally, A4 nitrogen, A5 gaseous fuel, A6 cooling water, A7 cooling water out, A8 powder, A9 powder. Naturally also different liquid or gaseous media can to be supplied be able in place of the media previous specified by way of the ports A1 to A7. The port Al0 is for the ignition unit and the port A11 for the pressure sensor mentioned vorgesehen.

The Fig. the device in a profile shows 2 along the line A-A in Fig in simplified representation. 1.

Since the fundamental structure and the impact of gattungsgemässen devices admit are, with all elements one does not deal in the following. Such devices are the professional world in particular also under the name HVOF (High Velocity Oxygen for) burners and/or plants bekannt.

The burner covers a base 1, on dern back a connection body 2 is attached. Within the base 1 a hollow body 3 is arranged, which forms inside the actual combustion chamber 4. The tubular exit of the hollow body 3 is connected with a tubing nozzle 5, which forms finallaterally the discharge opening 6 of the burner. On that the combustion chamber 4 a nozzle body 7 central into the connection body 2 is used turned side. The nozzle body 7 is exchangeably in the connection body 2 taken up, whereby it is fixed in axial direction by means of a torus 8. In addition the torus 8 is provided with a circular extension 9, which comes in axial direction at the nozzle body 7 to the plant. The torus 8 for his part puts on itself in axial direction at a shoulder of the hollow body 3. The torus 8 is provided with two axial through-holes 10, 11, which with ever an associated line L10, L11 let in into the connection body fluchten.

Over at the base 1 to fix and further elements like the nozzle body 7 and the torus 8 in axial direction to positioning and fixing an union nut 21 is arranged the connection body 2, their internal threads at an external thread of the connection body 2 attack is certain and when tightening the connection body 2 in axial direction against the base 1 pulls at the base 1. A further union nut 22 is arranged at the front end of the base 1, by means of which the tubing nozzle 5 together with the hollow body 3 is loaded and the torus 8 toward the connection body 2. Anyhow the device can be assembled by planning two Uberwurfmuttern 21.22 in the kind shown fast and simply and taken apart also again. This has in particular the advantage that possible wearing parts are exchanged as for example the hollow body 3, the tubing nozzle 5 or the nozzle body 7 fast and simply können.

As evident, a line leads 2nd from the fuel connection A1 the inside the connection body leads a fuel line L1 central by the connection body 2 to the nozzle body 7 from each connection, which serves mixing the media necessary for the enterprise of the burner and purposeful supplying of a fuel mixture as well as possible further gases into the combustion chamber 4. The nozzle body 7 is exchangeably in the connection body 2 taken up. After the loosening of the union nut 21 the connection body 2 can decreasing from the base and the nozzle body 7 taken and if necessary exchanged or replaced werden.

With the respective Kühlwasseranschluss a6, A7 connected lines L6, L7 is dealt not more in greater detail, since such admits serving cooling water pipes to cooling the thermally highly loaded parts is. The port Al0 is connected by an axial line L10 with the combustion chamber. The port A10 serves attaching a pressure sensor (not represented), by means of which the pressure predominating in the combustion chamber 4 can be measured. From the port A11 likewise a line L11 leads axially by the connection body 2 through into the combustion chamber 4. this line L11 serves the admission of an ignition unit (not represented), with which the fuel mixture in the combustion chamber 4 can be ignited. From the two powder connections A8, A9 leads ever a line L8, L9 diagonally into the device inside. The two powder lines L8, L9 flow essentially radially into the tubing nozzle 5. the powder lines L8, L9 serve supplying coating powder, which is drug along when entering the tubing nozzle by the hot gas flow and at least partly melted by the predominating temperature. In place of supplying the coating material in powder form this could for example also in Drahtform supplied werden.

The Fig 3. shows the device in a profile along the line B-B in Fig. 1. From this representation it is in particular evident that from the port A5 a line leads diagonally a L5 by the connection body 2 through to a front Ringkana114 of the nozzle body 7. From the port A3 a further channel leads diagonally by the connection body 2 through to the front Ringkana114 of the nozzle body 7.

From the Fig. 4, which the device on average along the line CC in Fig. 1 shows, is evident that of the connection a2 a line L2 to a rear ring channel 18 of the nozzle body 7 führt.

The Fig. the device shows 5 in a profile along the line D-D in Fig. 1. From this it is recognizable that the port A4 connected by a diagonal line with the front Ringkana114 of the nozzle body 7 ist.

Hold on in summary Iässt thus that the ports A3, A4 and A5 are connected with the front Ringkana114 by the three associated lines L3, L4 and L5, while the connection a2 leads across the line L2 to the rear ring channel 18. If by way of at least two of the three 14 lines L3, L4, connected with the front ring channel, L5 per a medium is supplied, then these media in the Ringkana114.

mix themselves Preferably at least the two fuel lines L1, L5 are provided with one valve each (not represented), by means of which the supply can be affected by fuel. Naturally such valves can also for particulars or all gas lines L2, L3, L4 intended werden.

On the basis the Fig. to 6a, 6b and 6c the structure of the nozzle body 7 is more near described. The Fig. 6a shows the nozzle body 7 in an opinion from the combustion chamber side, while the Fig. 6b a profile by the nozzle body 7 along the line A-A in Fig. 6a shows. The Fig. 6c shows a profile by the nozzle body 7 along the line B-B in Fig. 6a. In the Fig. 6b is recognizable that from the rear ring channel 18 axial drillings 19 lead to the front face of the nozzle body 7. In the Fig. 6c is recognizable that of the front ring channel 14 further axial drillings 15 to the front face of the nozzle body 7 führen.

In the Fig. 6a is recognizable that the drillings 19 evenly distributed on an internal pitch diameter 20 connected with the rear ring channel 18 are arranged, while the drillings 15 evenly distributed on an outside pitch diameter 16 connected with the front ring channel 14 are arranged. Both pitch diameters 16, 20 are coaxially arranged to a central opening 13 of the nozzle body 7. The central opening 13 of the nozzle body 7 serves the admission of an injection nozzle or a Einspritzventils (not represented), which serves injecting the liquid fuel into the combustion chamber. The nozzle body 7 is provided in addition with an internal thread, which serves fastening such an injection nozzle. Since admits such injection nozzles are, does not become here more near on it eingegangen.

The advantage of a such burner consists of the fact that this is universally applicable. So the burner can be operated for example with two fuels at the same time, as central a first fuel, for example kerosene, is supplied to the combustion chamber 4 by way of the nozzle body 7 - injection nozzle -, while at the same time a further fuel, for example hydrogen, is supplied to the combustion chamber 4. The second fuel can be supplied thereby by way of the drillings 15, 19 of the outside or internal pitch diameter 16, 20 of the nozzle body 7. Besides by way of the two ports A3, A4 arbitrarily further media can be supplied to the combustion chamber the requirements accordingly. So A3 an oxidative gas can be supplied as for example to oxygen by way of the port a2 and/or. If the oxygen is supplied by way of the port A3, mixes itself these in the front ring channel 14 with the medium supplied by way of the port A4 and/or A5. For example also an inert gas can be supplied as for example to nitrogen by way of the port A4, which causes that the temperature in the combustion chamber lowered wird.

In the technical language in this connection of the supply one is spoken “cold” gas. The Iochkreisförmige arrangement of the drillings has the advantage that the different media of the combustion chamber can be supplied evenly and central. Thus the burner is suitable in particular also to melt opens of rough powders and laying on thick layers and for producing rauen surfaces, there with the enterprise of the burner with two fuels per time unit very high temperatures and/or high melt open rates of the coating powder and/or very high gas speeds to be reached können.

Depending upon mode of operation it can be favourable to let flow over the drillings 15, 19 of the internal and/or outside pitch diameter 16, 20 of the nozzle body 7 a gaseous medium into the combustion chamber thereby a contamination of the drillings and/or a penetration of combustion chamber gases into the drillings mentioned 15, 19 prevented wird.

Naturally the burner can be operated also only with a fuel, whereby in principle both liquid are applicable as well as gaseous fuels. While as liquid fuel in particular kerosene is used, can be used as gaseous fuels for example hydrogen, natural gas, propylene, propane or ethyls. It understands itself the fact that the previous mentioned modes of operation under no circumstances when finally to be regarded is, but that with the device defined in the requirements a large number of different modes of operation is possible, whereby naturally also the number and arrangement of the descriptive connections and lines vary kann.

A further advantage according to invention arranged of the burner consists of the fact that in the enterprise without interruption by the one to the other fuel are switched kann.

In addition, the arrangement of the burner can naturally vary. So the nozzle body 7 could be provided for example in place of or additionally to the Iochkreisförmig arranged drillings 15, 19 with a ring channel, or ring in a circle trained sections, by way of which a medium or several media of the Brennkammer4 is supplied.