Classifications

• • C—CHEMISTRY; METALLURGY
  • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
  • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
  • C23C16/00—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes
  • C23C16/44—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating
  • C23C16/4401—Means for minimising impurities, e.g. dust, moisture or residual gas, in the reaction chamber
  • C23C16/4407—Cleaning of reactor or reactor parts by using wet or mechanical methods
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B08—CLEANING
  • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
  • B08B15/00—Preventing escape of dirt or fumes from the area where they are produced; Collecting or removing dirt or fumes from that area
  • B08B15/04—Preventing escape of dirt or fumes from the area where they are produced; Collecting or removing dirt or fumes from that area from a small area, e.g. a tool
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B08—CLEANING
  • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
  • B08B3/00—Cleaning by methods involving the use or presence of liquid or steam
  • B08B3/04—Cleaning involving contact with liquid
  • B08B3/10—Cleaning involving contact with liquid with additional treatment of the liquid or of the object being cleaned, e.g. by heat, by electricity or by vibration
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B08—CLEANING
  • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
  • B08B7/00—Cleaning by methods not provided for in a single other subclass or a single group in this subclass
  • B08B7/0021—Cleaning by methods not provided for in a single other subclass or a single group in this subclass by liquid gases or supercritical fluids
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B08—CLEANING
  • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
  • B08B7/00—Cleaning by methods not provided for in a single other subclass or a single group in this subclass
  • B08B7/0064—Cleaning by methods not provided for in a single other subclass or a single group in this subclass by temperature changes
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B08—CLEANING
  • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
  • B08B9/00—Cleaning hollow articles by methods or apparatus specially adapted thereto 
• • C—CHEMISTRY; METALLURGY
  • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
  • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
  • C23C16/00—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes
  • C23C16/04—Coating on selected surface areas, e.g. using masks
  • C23C16/045—Coating cavities or hollow spaces, e.g. interior of tubes; Infiltration of porous substrates
• • C—CHEMISTRY; METALLURGY
  • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
  • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
  • C23C16/00—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes
  • C23C16/44—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating
  • C23C16/455—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating characterised by the method used for introducing gases into reaction chamber or for modifying gas flows in reaction chamber
  • C23C16/45563—Gas nozzles
• • C—CHEMISTRY; METALLURGY
  • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
  • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
  • C23C16/00—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes
  • C23C16/44—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating
  • C23C16/54—Apparatus specially adapted for continuous coating
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B08—CLEANING
  • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
  • B08B3/00—Cleaning by methods involving the use or presence of liquid or steam
  • B08B3/04—Cleaning involving contact with liquid
  • B08B3/10—Cleaning involving contact with liquid with additional treatment of the liquid or of the object being cleaned, e.g. by heat, by electricity or by vibration
  • B08B3/12—Cleaning involving contact with liquid with additional treatment of the liquid or of the object being cleaned, e.g. by heat, by electricity or by vibration by sonic or ultrasonic vibrations
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B08—CLEANING
  • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
  • B08B7/00—Cleaning by methods not provided for in a single other subclass or a single group in this subclass
  • B08B7/0064—Cleaning by methods not provided for in a single other subclass or a single group in this subclass by temperature changes
  • B08B7/0071—Cleaning by methods not provided for in a single other subclass or a single group in this subclass by temperature changes by heating
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B08—CLEANING
  • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
  • B08B7/00—Cleaning by methods not provided for in a single other subclass or a single group in this subclass
  • B08B7/0064—Cleaning by methods not provided for in a single other subclass or a single group in this subclass by temperature changes
  • B08B7/0092—Cleaning by methods not provided for in a single other subclass or a single group in this subclass by temperature changes by cooling

Definitions

• the present invention relates to a device for coating of
• Hollow bodies with at least one coating station comprising a gas lance.
• Hollow bodies include in particular containers, such as bottles, ampoules and cartridges. It also relates to a method for cleaning a gas lance of such a coating apparatus.
• Such devices are used, for example, in the vacuum control of a silicon oxide coating process, in particular in the plasma CVD coating of PET bottles.
• a coating Barrieresyteme be realized for various application formats.
• O 2, CO 2 and H 2 O barriers are applied to PET bottles. Since this process takes place in a vacuum, it is necessary to use the different ones
• the apparatus further includes a plasma generator, for example a microwave generator, and a gas lance with an outlet opening projecting into the container for introducing a material to be deposited on the inner wall of the container.
• a process gas such as siloxane gas
• Coating devices are known from DE 10 2010 023119 A1 or from EP 1 507 893 B1.
• such a coating device has a considerable throughput. So in a day tens of thousands of bottles and can several thousand bottles are coated per hour. A problem in such a device is that the outlet opening of the gas lance grows relatively quickly by coating. This requires frequent cleaning or frequent replacement of the gas lance.
• the gas lance is in the space of the coating process, it is exposed to the microwave field in the vacuum chamber.
• field elevations or field concentrations which favor a preferred deposition of process products, such as silicon oxide and thus an increase in layers, are formed on the exit side at the pipe end.
• This coating process leads after a relatively short time to a reduction of the outlet opening or the
• the gas lance has one
• the supply of the respective process gases for the coating takes place via them and serves as an antenna for the electromagnetic field orientation in the vacuum chamber.
• at least a portion of the process gas can be sucked out of the container and / or the vacuum chamber via the gas lance, and the flash gas - usually air - are introduced.
• the inner diameter is preferably constant and thus has a defined value.
• the outlet opening is thus larger than conventional gas lances, in which the size of the outlet opening was previously defined solely by the inner diameter of the gas lance. Due to the enlarged outlet opening, the escaping process gas, such as, for example, siloxane, as it exits the gas lance and enters the plasma, has a significantly lower tendency to precipitate SiO x layers at the end edge of the gas lance surrounding the outlet opening.
• the electromagnetic field orientation and field concentration is in the
• the coating can only be removed by sand blasting or by a sodium hydroxide solution (with ultrasound). The result is that the maintenance and cleaning effort is still significant.
• Cleaning position of the CIP unit a cleaning fluid wets the end of a gas lance.
• the inlet or the end region of the gas lance can be brought into this cleaning position.
• the Device is a fast, regular cleaning easily possible, which can also be done during breaks or downtime. It is no longer necessarily a period of several hours for cleaning necessary, for example. Overnight.
• the invention also provides a better separation quality achieved because field disturbances are minimized by deposits in the end region of the gas lance, in particular at its end edge. The plant operator no longer has to wait until expansion is possible or necessary.
• An advantageous development of the invention provides that a heating means for heating the gas lance and / or a vibration emitter, in particular an ultrasonic emitter, at least a portion of the gas lance and / or a component carrying the cleaning fluid is arranged. As a result, either by thermal or mechanical support, the cleaning of the end portion of the gas lance of deposits is achieved.
• Cleaning fluid is a gaseous medium at room temperature and atmospheric pressure and a cooling for the gaseous cleaning fluid and / or a bearing for a liquid supply of the cleaning fluid is provided with a liquid gas expansion unit.
• a gas for example, carbon dioxide or nitrogen come into question, which are brought by cooling to less than 20 ° C.
• a further advantageous embodiment of the invention provides that a housing, in particular in the form of a bell, is present, which in a
• Treatment position is at least partially movable over the end of the gas lance and forms a treatment room in this treatment position.
• a simple device is provided, through which a coating can take place.
• a further advantageous embodiment of the invention provides that the inlet is arranged in the interior of the housing in the treatment position. As a result, a compact design is achieved, as for receiving the inlet no
• a further advantageous embodiment of the invention provides that a derivative for residues of deposits at the end of the gas lance is present, the
• a CIP unit is provided with a housing through the volume of a fluid circuit flows through an inlet and a drain.
• the fluid circuit is achieved by means of a suitable, known to those skilled device.
• the housing encloses the end region of the gas lance completely fluid-tight in its cleaning position. In this cleaning position, the end portion of the gas lance is wetted by a cleaning fluid carried by the fluid circuit.
• Suitable cleaning fluids are, in particular, bases which are preferably hot.
• the CIP unit is arranged in a location in which it does not surround the gas lance and this within the zu
• Seal pneumatically expandable This ensures a good fluid tightness for the volume within the housing, which can be achieved, for example, even with different thickness gas lances.
• the housing g may be formed curly or cup-like.
• a cup is designed in one piece and has the advantage that it can be easily manufactured and easily sealed against the gas lance.
• the housing be formed in two or more parts, in which case the
• a multi-part housing has the advantage that it can be positioned more easily around the gas lance in its cleaning position, in particular if the seal itself has to be made around the outer peripheral surface of the gas lance and does not take place on the support floor.
• a further advantageous embodiment of the invention provides that a seal between the housing and a base plate is arranged, through which the
• Gas lance is arranged movable in its longitudinal direction. This ensures a good contact surface for the seal.
• a further advantageous embodiment of the invention provides that the base plate is horizontal and part of the gas lance. Since the base plate is part of the gas lance, no additional part between the gas lance and the housing must be arranged, eliminating the need for additional sealing surfaces.
• the gas lance is fixed and is enclosed in the entire length of the housing.
• Fluid heating in the fluid circuit is present.
• the cleaning fluid can be brought to a high temperature directly in the area, whereby the deposit at the end of the gas lance more easily detach.
• a further advantageous development of the invention provides that an ultrasound emitter is arranged in or on the housing. As a result, the effect of an ultrasonic cleaning bath is achieved, resulting in a better and faster
• a further advantageous development of the invention provides that the gas lance has a fluid guide channel at least in one section. Thereby are no additional supply and discharge lines for the cleaning fluid in the housing necessary.
• a further advantageous development of the invention provides that the housing encloses a plurality of gas lances. As a result, several gas lances can be cleaned at the same time, whereby the cleaning of all gas lances of the
• Coating device required design effort is reduced, such as a smaller number of leads, valves, etc.
• Closure is provided by means of which at least a portion of the inner volume of the gas lance is closed. This ensures that no cleaning fluid can penetrate into the lower region of the gas channel of the gas lance and thus into the pipeline leading the process gases.
• Closure is connected to a collecting container or part thereof, and wherein at least one fluid inlet is provided and a fluid connection is provided in the interior of the collecting container. As a result, may remain in the volume of the gas lance residual remainder of the cleaning or flushing fluid
• the object is also achieved by a method having the features of claim 19.
• the cleaning of the gas lance is carried out by remaining in the coating apparatus, the following steps in the specified
• a fluid-tight enclosure of at least a partial length of the gas lance including its free end by a housing then a portion of the gas lance, which includes at least the free end, wetted with the cleaning fluid.
• the cleaning fluid is drained again.
• the gas lance does not have to be removed manually for cleaning, but it can be carried out a CIP process be, whereby the time-consuming removal and installation of the gas lance in the
• an advantageous development of the method according to the invention provides that the gas lance, in particular by means of a heater, such as an open burner, such as a pore burner or an induction heater to above 150 ° C, preferably above 350 ° C, is heated and then wetting by means of flow or overflow occurs with cleaning fluid having a temperature below 20 ° C. It is advantageous if the temperature of the cleaning fluid is below 0 ° C., preferably below -100 ° C. Due to the heating of the gas lance, even in the region of its free end, exists due to the
• a further advantageous development of the method according to the invention provides that the cleaning fluid is liquid nitrogen or liquid CO 2, these preferably being converted from their liquid into the gaseous state immediately before. This is particularly suitable for the removal of deposits.
• a further advantageous development of the method according to the invention provides that a discharge, in particular by means of a suction, of chipped residues. As a result, it is not necessary to put the device out of service to remove the deposits detached from the gas lance; the device does not have to be opened.
• a further advantageous development of the method according to the invention provides that the gas lance is set in vibration during the shock cooling.
• the removal of the deposits from the gas lance is supported because the shock-frozen deposits break off so well.
• the object is also achieved by a method having the features of claim 25.
• the cleaning of the gas lance is carried out by remaining in the coating apparatus, the following steps in the specified
• a fluid-tight enclosing at least a partial length including the free end of the gas lance with the housing then a cleaning fluid is introduced into the housing, which expires after a definable residence time from the housing, and finally the housing of the gas lance away.
• the gas lance does not have to be manually removed for cleaning, but a CIP process can be performed, thereby avoiding the time-consuming removal and installation of the gas lance into the coating apparatus.
• An advantageous development of the method according to the invention provides that the steps of reading and discharging the cleaning fluid after the residence time are performed several times in succession. This achieves even better cleaning of the end region of the gas lance.
• a further advantageous development of the method according to the invention provides that the cleaning fluid is passed through the housing by means of a fluid circuit.
• a further advantageous development of the device according to the invention and the method provides that a heat source for the cleaning fluid is present, so that esp. Hot liquor can be used.
• a further advantageous development of the method according to the invention provides that after discharging the cleaning fluid, one or more flushes of the volume of the housing were effected by means of water. If necessary, the air-contacting line spaces are traversed by air, ideally heated air, for which purpose corresponding supply lines are provided. This ensures that no residues of the cleaning fluid are more present in the report of the gas lance.
• Fig. 1 is a schematic representation of a first invention
• Fig. 2 is a schematic representation of a second invention
• Fig. 3 is a schematic representation of a closure plug in
• Fig. 5 is a schematic representation of a fifth embodiment of the invention.
• Fig. 6 is a schematic representation of a sixth invention
• FIG. 1 shows schematically only the parts of a first invention
• the relevant part of the invention relates to a gas lance 6 of
• This has a horizontal base plate 8, from which its pipe extends vertically upwards and whose upper end in
• end region 7 Following end region 7 is called. Deposits of the process gas used - for example, siloxane - are deposited in this end region 7-as explained above in the description of the prior art.
• the process gas flows from below via an inlet 10 through the gas lance 6 to the end region 7 and exits there from the gas lance and fills the inner volume of a to be treated
• the CIP unit In order to remove the deposits 9 in the end region 7 of the gas lance 6, a CIP unit is brought over this end region 7 - this can be done either mechanically by hand or automatically.
• the CIP unit has a housing 1, which has a U-shape in cross section, whose opening is oriented downwards. In the area of this opening, a horizontal wall is present. Between the housing 1 - esp. The wall - and the outer wall of the gas lance 6, a seal 5 is arranged, which ensures that the volume of the housing. 1 is sealed fluid-tight.
• the CIP unit also has an inlet 3 and a drain 4.
• a cleaning fluid 2 is supplied by means of the inlet 3 into the volume of the housing 1.
• the drain 4 for the cleaning fluid 2 in the housing 1 - in the Fig, 1 esp. In the horizontal wall - is also present.
• a fluid heater 13 is provided in the upper part of the housing to heat the liquor, which in the present variants according to FIGS. 1 and 2 is designed, for example, as induction heating.
• an ultrasonic emitter 12 is present in the wall of the housing 1. By means of this, the effect of an ultrasonic cleaning bath is achieved.
• FIG. 2 a second embodiment of the invention is shown schematically. Again, only the already known from Fig. 1 and for the invention only relevant area of the coating system is shown. Same and
• the gas lance 6 is linearly movable here. It can be moved vertically along its direction of movement B. It runs in an opening in a base or support plate, below
• Base plate 8 called. Through them, the process gas can flow out of its end region 7.
• the deposit 9 in the end region 7 is not shown.
• On this base plate 8 is also a support and holding device for treatment
• Container arranged (not shown).
• only one combined inlet 3 and outlet 4 is present, which runs through a channel in the base plate 8.
• the housing 1 has no horizontally extending wall in the region of its opening.
• the known from the first embodiment of Fig. 1 seal 5 is disposed between the edge of the housing 1, which forms its lower end and its opening, and the base plate 8 in such a way that the channel in the base plate 8 between the seal 5 and the gas lance 6 is located.
• a further seal 5 between the gas lance 6 and the channel in the base plate 8 is present, so that even here with a movement of the gas lance 6 along the direction of movement B no fluid can escape from the housing 1.
• FIG. 2 analogous to FIG. 1, a fluid heater 13 as induction heating and a
• a third embodiment of the invention is shown, which differs from the firstdetectingsbeetter of Figures 1 or 2 substantially by a plug which is inserted into the gas passage of the gas lance 6.
• the closure plug has a swelling body 18, on which three circumferential sealing lips 15 are arranged.
• the cavernous body 18 is connected to a gas line 17 via a vertically extending pipe 16 connecting it to the housing 1 in a load-bearing manner. Via the gas line 17, gas can be pumped into the swelling body 18 or pumped out of it.
• the feed 10 shown in FIG. 1 for the process gas with associated further parts is not shown in FIG.
• the deposition 9 in the end region 7 of the gas lance 6 can be very massive and thus can greatly reduce the opening of the gas channel for the process gas, it is possible if the swelling body 18 is in its smallest state, this together with its annular sealing lips 15 still in the to introduce narrowed opening.
• the sealing lips 15 have a wedge shape in cross-section, for example, so that they fold upwards when the swelling body 18 is introduced into the opening of the gas lance 6 and thus little resistance when passing the deposit 9 through the
• the cavernous body 18 is fixed to the housing 1 via the supporting tube 16 so that it penetrates due to the stationary gas lance 6 a previously definable depth into the opening of the gas channel in the end portion 7 of the gas lance 6 in this. There it is so far inflated by means of a gas via the gas line 17 (this is illustrated by the two double arrows within the swelling body 18) until its sealing lips 15 abut against the inner wall of the gas lance 6 of the gas channel and fluid tightness is ensured. Thus, no cleaning fluid 2 from the housing 1 in the lower region of the gas channel of the gas lance 6 penetrate.
• the housing 1 is removed again and thereby the cavernous body is pulled out of the gas duct of the gas lance 6. This is possibly still in the dead space 7.1 above the uppermost sealing lip 15 and the upper end of the gas lance 6 existing cleaning fluid 2 upwards from the dead space 7.1 by means of the uppermost sealing lip 15 - or possibly one of the other sealing lips 15 - pushed out and can not in the Gas channel of the gas lance 6 arrive.
• This process can be assisted by introducing a purge gas, in particular air, at a suitable point in the conduit path leading to the gas lance 6.
• a purge gas in particular air
• the fourth embodiment of the invention of FIG. 4 differs from the embodiment shown in FIG. 3 substantially in two points.
• the ultrasonic emitter 12 is not attached to the housing 1, but around the gas lance 6 around.
• a collecting container 25 with upstream is not attached to the housing 1, but around the gas lance 6 around.
• the attachment of the ultrasonic emitter 12 to the wall of the gas lance 6 is just as efficient as the attachment to the housing 1, since vibrations are also generated in the region of the deposit 9 - here by means of a propagation through the gas lance 6.
• the attachment to the Gas lance 6, since the ultrasonic emitter 12 then does not always have to be moved with the housing 1, but remains stationary.
• Fluid collector 27 with downstream collection container 25 is present.
• the fluid collector 27 has a main body - with two circumferential sealing lips 15, as they are known from Figure 3 which is formed in its upper part as a kind of funnel 27.1 or collecting area for a plurality of pipe sections. This is followed by a derivation 27.2, which via a valve 24, which has a
• Control line 28 can be opened or closed by a controller 29, merges into an exit 27.3. At this the collecting container 25 connects.
• the collecting container 25 may, for example, be designed as an expandable part - comparable to the cavernous body 18 from FIG. 3 - or as a tube with negative pressure.
• the deposit 9 does not narrow this further opening as far as in the case of a straight, purely cylindrical end region 7 and the closure plug can thus easily pass through the deposit 9 or past it be guided.
• the collecting container 25 is ideally applied during insertion before cleaning with a negative pressure. It may also consist of an elastic, deformable material, so that it is used with negative pressure and reduced volume and, when switching the valve 24, the residual liquid from the dead space 7.1 sucks and thereby increases again.
• housing 1 with the shape of a bell or cup, other shapes may be used;
• the housing 1 also does not have to be in one piece, as shown in the exemplary embodiments, but may also be composed of two or more housing or shell parts.
• the closure plug comprises only at least one sealing lip 15 or sealing body, which are held on a support body, without further elements of the aforementioned Figure 4, such as Collection container 25 or the valve 24.
• the closure plug consists in
• this support body may be held on the housing 1 or be separately replaceable. In this case, that it is separable, the support body would be introduced before the enclosure of the gas lance 6 with the housing 1 in the gas lance 6 and pulled out after the cleaning process manually or by a suitable removal device and removed.
• Ultrasonic emitter likes Figure 4 also provide in one of the other embodiments or to provide the supply and discharge lines 3, 4 corresponding to the other variants.
• a fifth embodiment of the invention is shown schematically. It differs from the previous embodiments in the
• Induction heater 30 attached.
• the cleaning fluid 2 is in the form of liquid nitrogen in gas bottles 35 before.
• This liquid nitrogen is transferred directly before its use as a cleaning fluid 2 in a suitable expansion unit 36, here in the form of an evaporator 36, in its gaseous phase and via a cooling line 37 (including necessary, known in the art devices) to a bell 34 (FIG. which may also be in the form of a hood).
• This bell 34 is pushed over the covered with deposits end 7 of the gas lance 6 and thus forms a treatment room 41.
• the bell 34 is thus in its treatment position in which the cleaning takes place; so it is also their cleaning position.
• the cleaning takes place in that the very cold gaseous cleaning fluid 2 flows into the bell 34 via an inlet 3 at the upper end and wets the end region 7 of the gas lance 6 together with the deposits 9 adhering thereto.
• the inflow of the cold cleaning fluid 2 is bubbled by
• Deposits 9 are cooled as in a shock cooling, while very brittle and dissolve or disintegrate partly already solely by the fast
• T em peratu r change.
• the deposits 9 are also blasted off and fall down.
• the part of these blown-off deposits 9, which falls into the gas channel of the gas lance 6, is replaced by a (not shown) at the lower end thereof.
• Removed suction unit The other part, which falls outside the gas channel onto the base plate 8, is collected there within a collecting ring 31 and removed from the coating device via a suitable suction unit, which here comprises a suction line 32 and a suction pump connected thereto.
• a suitable suction unit which here comprises a suction line 32 and a suction pump connected thereto.
• the duration of the inflow is 1 to 60 seconds, ideally 10 to 30 seconds, this duration being dependent on the dimension of the gas lance 6 to be wetted and the volume flow of the cleaning fluid 2.
• FIG. 6 a sixth embodiment of the invention is shown schematically. It differs from the exemplary embodiment according to FIG. 5 essentially only in that the gaseous cleaning fluid 2 is provided differently becomes. The following is only on the differences from the fifth
• Embodiment of FIG. 5 received.
• ambient air is passed through a compressor 45 and a filter 46 in a pressure vessel 47, so that via a valve 44.2, the gas can be initiated as needed and in a large surge in the bell 34.
• a bypass line 42 is provided, in which a heat exchanger 43rd
• valve 44.1 is integrated and which is connected to the supply line 48 via a valve 44.1. This can alternatively be incorporated in the supply line 48.
• the induction heater 30 for heating the deposits 9 (not shown) in the end region 7 of the gas lance 6 this can be done by means of a passage of heating or combustion gases through this end region 7 (shown as dashed line).
• the hot gas is blown through one or more heating inlets 39 into the gas space of the gas lance 6 by means of a blower 38 via a suitable supply line.
• this hot gas again passes through one or more heater outlets 40 together with it
• the gas On the way through the gas space of the gas lance 6, the gas has strongly heated the end area 7 of the gas lance 6 together with the deposits 9 located thereon - comparable to the alternative induction heating 12 described above.
• a further or alternative heating means for induction heating 30 is further shown, which is designed as a radiator 30 'and one or more
• Radiation elements includes.
• the radiator 30 ' works without contact and can be slightly spaced from the gas lance 6.
• Possible radiators 30 ' are IR radiators, electric heaters or pore burners.
• the Bell 34 are moved after heating the end portion 7 of the gas lance 6 between these and the radiator 30 '.

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• Chemical & Material Sciences (AREA)
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