Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
  • F23D—BURNERS
  • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
  • F23D14/46—Details
  • F23D14/62—Mixing devices; Mixing tubes
  • F23D14/64—Mixing devices; Mixing tubes with injectors
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
  • F23D—BURNERS
  • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
  • F23D14/12—Radiant burners
  • F23D14/14—Radiant burners using screens or perforated plates
  • F23D14/145—Radiant burners using screens or perforated plates combustion being stabilised at a screen or a perforated plate
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
  • F23D—BURNERS
  • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
  • F23D14/12—Radiant burners
  • F23D14/14—Radiant burners using screens or perforated plates
  • F23D14/148—Radiant burners using screens or perforated plates with grids, e.g. strips or rods, as radiation intensifying means
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F26—DRYING
  • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
  • F26B3/00—Drying solid materials or objects by processes involving the application of heat
  • F26B3/28—Drying solid materials or objects by processes involving the application of heat by radiation, e.g. from the sun
  • F26B3/30—Drying solid materials or objects by processes involving the application of heat by radiation, e.g. from the sun from infrared-emitting elements
  • F26B3/305—Drying solid materials or objects by processes involving the application of heat by radiation, e.g. from the sun from infrared-emitting elements the infrared radiation being generated by combustion or combustion gases
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
  • F23D—BURNERS
  • F23D2213/00—Burner manufacture specifications

Definitions

• the invention relates to an infrared radiator for an infrared drying unit with a radiator housing, which is divided in its interior by a gas-permeable burner plate into a distribution space for the gas-air mixture and into a combustion space.
• a large proportion of the energy contained in the combustion exhaust gases is convectively transferred to a solid, which emits it as infrared radiation on the front of the radiator.
• the radiator is held by a mixing tube attached to its rear wall, through which a gas-air mixture is fed to the distribution chamber, the mixing tube having a gas nozzle with gas supply at its end facing away from the radiator housing, is connected to an air supply and is attached to a holding frame of the drying unit is.
• Such infrared emitters are known to be used in dryer systems which are used to dry sheet-like materials, for example paper or cardboard sheets. Depending on the width of the web to be dried and the desired heating output, the required number of emitters is put together in one or more rows to form a drying unit, the individual emitters being arranged directly next to one another with aligned radiation surfaces.
• a generic infrared radiator is described in EP-0128202-B.
• Gas-heated infrared emitters are subject to wear during operation, so that it is necessary to replace them after a period of use between approximately two and four years. Furthermore, they usually have to be serviced once or twice a year to check whether the function of the gas nozzles in the mixing tube or the emitter itself is impaired by contamination.
• the replacement and maintenance of the known radiators is very time-consuming, since several assembly steps have to be carried out to loosen the radiator housing and to clean the nozzles when the drying unit has cooled and is therefore not in operation. This causes downtimes of the system in which the drying unit is integrated, for example a coating system for paper or cardboard webs.
• the invention is therefore based on the object of improving a generic infrared radiator and / or its holder so that it can be removed and reinstalled as quickly as possible from an infrared drying unit.
• the spotlight housing is connected to the holding frame via releasable fastening means which can be released manually from the front.
• the spotlights can be quickly removed from the easily accessible front and reattached. Maintenance work on parts of the spotlight housing can be carried out outside the system without time pressure.
• the radiator housing is screwed to the end of the mixing tube by means of screws which are from the radiating
• Front of the spotlight can be loosened or screwed down.
• the screws are preferably designed and screwed in so far that their heads are in the cooler distribution space behind the burner plate and not in the hot combustion chamber in front of the burner plate, as claimed in claim 3.
• the burner plate then has adapted bores through which the screw head can be reached with a tool. If a metal grille limits the radiation area, it is either only clamped on, that is to say quickly detachable, or it also has corresponding bores.
• Particularly advantageous, since it can be released very quickly, is the attachment of a radiator with a quick coupling according to claim 4, which can be released by pushing against or pulling on the front of the radiator housing, i.e. by a force parallel to the axial direction of the mixing tube.
• the quick coupling is based on conventional ones Coupling mechanisms and contains a socket-shaped holding part and a coupling point
• the quick coupling is between the back wall of the housing and the mixing tube
• Claims 6 to 11 contain preferred, since particularly advantageous, configurations of an infrared radiator which can be securely and gas-tightly fastened to the holding frame and can be released by pressure on the front of the radiator housing
• the infrared radiator according to claim 6 contains a quick coupling
• Receiving part an insertion part which can be pushed at least partially into the receiving part against the force of a spring, and a locking mechanism with a locking element and an associated receiving element, the locking element being fastened to a coupling part,
• the sub-claims 7 to 11 contain particularly advantageous embodiments of such an infrared radiator.
• FIG 1 shows an embodiment of an infrared radiator with the mixing tube, on which the radiator housing is screwed.
• Figure 2 shows the radiator housing of another embodiment of a radiator in the unscrewed state.
• Figure 3 shows a section through an infrared radiator with a quick connector.
• Figure 4 shows a section through the end of the gas supply line with the receiving part of the quick coupling.
• FIG. 5 shows a side view of the elements from FIG. 4.
• FIG. 6 shows a section through the mixing tube with the plug-in part of the quick coupling.
• Figure 7 shows a side view of the elements of Figure 6.
• the infrared radiator contains a radiator housing 1 which is delimited by side walls 2 and a rear wall 3 arranged at right angles to one another.
• the interior of the lamp housing 1 is divided by a gas-permeable burner plate 5, the back of which forms a distribution space for the gas-air mixture supplied with the rear wall 3.
• a combustion chamber 7 follows in the flow direction behind the burner plate 5, in which the gas-air mixture flowing through holes 8 in the burner plate 5 is burned. A large proportion of the combustion energy is convectively transferred to solids, which they emit as infrared radiation on the front of the radiator.
• the solid bodies are a ceramic burner plate 5 and a grid 23 with a frame 4.
• the solid bodies are a plurality of blasting bodies 24 and a grid 23 which holds the blasting bodies 24.
• the grids 23 form the end of the radiator on the front.
• the radiator housing 1 is held by a mixing tube 9 attached to its rear side, which opens into the distribution chamber 6.
• a baffle plate 10 is arranged in the distribution chamber 6, against which the mixture supplied from the mixing tube 9 flows.
• the gas supply line 12 is connected to a manifold 13 from which a plurality of radiators arranged next to one another are supplied with gas 14.
• the supply of air 15 takes place via a hollow cross member 16 to which the mixing tube 9 is attached.
• the connecting line 17 for the air supply opens into the upper part of the mixing tube 9 in a downwardly open air chamber 18 comprising the outlet end of the gas nozzle 11, so that a gas-air mixture is introduced into the mixing space 19 of the mixing tube 9 from above.
• radiators are arranged directly next to each other across the width of the web to be dried and form a drying unit. If the required heating output requires this, several rows are arranged one behind the other in the direction of web travel.
• the heaters are attached to a holding frame of the drying unit.
• the hollow cross member 16, to which the mixing tube 9 is fastened with the housing 1 serves as a holder for the radiators.
• the hollow cross member 16 is thus part of the holding frame of the drying unit. It is essential for the invention that the radiator housing 1 is connected to the holding frame (in FIGS. 1 and 3 with the hollow cross member 16) via releasable fastening means which can be released manually from the radiating front surface.
• the radiator housing is detachably screwed with its rear wall 3 at the end of the mixing tube 9 by means of screws 20.
• the rear wall 3 has an annular flange 21 which is screwed to a flange-like widening of the mixing tube 9.
• the screws 20 are so short that their heads provided with a hexagon socket are in the fastening position shown in FIG. 1 within the distribution space 3, ie behind the burner plate 5.
• the heater When the heater is in operation, they are completely in the flame-free area of the heater and are not heated to an unacceptably high level. So that the screws 20 can be loosened from the radiating front of the radiator, the burner plate 5 and the blasting body 4 have adapted bores 22 through which a tool for loosening and tightening the screws 20 can be guided.
• the releasable fastening means is a quick coupling which can be released by pushing or pulling on the front side, that is to say by pulling or pushing force in the axial direction of the mixing tube 9.
• the quick coupling is based on conventional coupling mechanisms and consists in a known manner of a socket-shaped receiving part and a plug-in part, which can be clamped together by a pressure acting in the axial direction and can be released from one another by a train or pressure also acting in the axial direction.
• the coupling force is applied by spring elements that release the insert part under pressure or tension.
• Both coupling parts are preferably tubular so that the gas, the air and / or the gas-air mixture can flow through the quick coupling.
• the quick coupling is arranged between the rear wall of the housing and the mixing tube.
• the mixing tube remains connected to the holding frame when it is detached, only the lamp housing is detached.
• the quick coupling is arranged at the upper end of the mixing tube between the gas supply line and the gas nozzle.
• the detachable part of the quick coupling contains the gas nozzle.
• the lamp with the mixing tube and the gas nozzle attached to it is released.
• the gas supply line is firmly connected to the holding frame.
• the elements for the gas supply are designed to be sufficiently stable, since they serve as holders for the radiator with the mixing tube during operation.
• a preferred embodiment of an infrared radiator designed in this way is shown in FIGS. 3 to 7 and is described in more detail below:
• the quick coupling consists of two coupling parts: a receiving part with the gas supply (FIGS. 4, 5), which is attached to the hollow crossbar 16, and an insert part (FIGS. 6, 7), which is formed by the upper end of the mixing tube 9.
• the receiving part has a sleeve-shaped housing 24 which is screwed onto the hollow cross member 16 as part of the holding frame.
• the housing 24 In its lower part, the housing 24 has a slightly reduced inside diameter, so that a circumferential projection is formed at the transition between the upper part and the lower part.
• the housing 24 On the gas supply side, the housing 24 is closed with a plug 25 which has a central bore to which the gas supply line 12 is connected.
• a central tube 26 adjoins the bore, over which a compression spring 27 is drawn.
• the spring 27 presses against a sealing piece 28 which is adapted to the inside diameter of the housing 24 and has a central through-bore 29 into which the end of the tube 26 is fitted in a gastight manner.
• the sealing piece 28 can be moved axially on the tube 26, its upper
• End position of the plug 25 its lower end position is determined by the projection on the inside of the housing 24.
• the gas can thus flow from the supply line 12 through the pipe 26 and the sealing piece 28 into the lower, open part of the housing 24, where there is a lateral opening 30 for the air supply 17.
• the plug-in part of the quick coupling is formed by the upper end of the mixing tube 9, which is closed by the gas nozzle 11.
• the outer diameter of the end of the mixing tube 9 with the gas nozzle 11 is adapted to the inner diameter of the lower part of the housing 24 for insertion.
• both parts each carry elements of a locking mechanism which can be released by pressure on the front of the radiator housing 1.
• the locking mechanism consists of a locking element fastened to one part of the quick coupling and an associated receiving element which is fastened to the other quick coupling part.
• the locking element moves into the receiving element and is locked there.
• it is mounted on a rotary mechanism which is actuated against the receiving part when the plug-in part moves. The rotating mechanism rotates the locking element alternately with each movement of the insertion part against the receiving part in a locking position holding the coupling parts together and an unlocking position in which the coupling parts can be released from one another.
• the locking element is fastened on the outside on one side of the mixing tube 9. It consists of a locking pin 33 which is fastened transversely to the end of a shaft 34, which is rotatably mounted on a projection 32 fastened to the mixing tube 9 and extends parallel to the longitudinal axis of the mixing tube 9. A rotating link 35 is drawn over the shaft 34, which rotates the shaft 34 by 90 ° with each locking movement relative to the shaft 34 with the locking pin 33 attached to it.
• the associated receiving element of the locking mechanism is fastened to the housing 24 of the receiving part of the quick coupling. It consists of a receptacle bush 36 fastened to the housing 24, into which the locking pin 33 moves when the coupling parts are assembled becomes.
• the receptacle 36 contains a lock into which the end of the shaft 34 is moved with the locking pin 33 in the manner of a key.
• the rotating link When moving into the receiving bush 36, the rotating link is held at the edge of the receiving bush 36.
• the subsequent axial displacement in the rotating link 35 rotates the shaft 34 with the locking pin 33 by 90 °, so that the locking pin 33 is in its locking position, as shown in FIG. 1. In this position it is held by the force of the compression spring 27.
• the quick coupling can be released again by pressing against the front of the lamp housing 1.
• the plug with the gas nozzle 1 1 moves against the force of the compression spring 27 further into the housing 24.
• the rotating link 35 rotates the locking pin 33 through 90 ° into its unlocked position in the lock of the receptacle 36.
• the plug-in part of the quick coupling can pulled out and thus the mixing tube 9 with the radiator housing 1 attached to it can be released.
• the quick coupling is arranged within a two-part mixing tube, the non-releasable part of the quick coupling containing the gas nozzle. This part with the gas nozzle thus remains on the holding frame after the radiator has been detached, but is freely accessible for servicing the nozzle.
• the gas nozzle is preferably screwed into a coupling part of the quick coupling. It is accessible after loosening the quick coupling and can be easily unscrewed.

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• Engineering & Computer Science (AREA)
• Chemical & Material Sciences (AREA)
• Combustion & Propulsion (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Life Sciences & Earth Sciences (AREA)
• Microbiology (AREA)
• Drying Of Solid Materials (AREA)
• Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)

Applications Claiming Priority (3)

Publications (2)

Family

ID=7911822

Family Applications (1)

Country Status (6)

Families Citing this family (10)

Family Cites Families (9)

• 1999
  • 1999-06-19 DE DE19928096A patent/DE19928096A1/de not_active Withdrawn
• 2000
  • 2000-06-14 EP EP00936882A patent/EP1190138B1/fr not_active Expired - Lifetime
  • 2000-06-14 AT AT00936882T patent/ATE267289T1/de active
  • 2000-06-14 DE DE50006507T patent/DE50006507D1/de not_active Expired - Lifetime
  • 2000-06-14 ES ES00936882T patent/ES2220470T3/es not_active Expired - Lifetime
  • 2000-06-14 US US10/019,002 patent/US6665950B1/en not_active Expired - Fee Related
  • 2000-06-14 WO PCT/EP2000/005447 patent/WO2000079045A1/fr not_active Ceased

Non-Patent Citations (1)

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