CA2383813A1 - Electromagnetic irradiating device - Google Patents
Electromagnetic irradiating device Download PDFInfo
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- CA2383813A1 CA2383813A1 CA002383813A CA2383813A CA2383813A1 CA 2383813 A1 CA2383813 A1 CA 2383813A1 CA 002383813 A CA002383813 A CA 002383813A CA 2383813 A CA2383813 A CA 2383813A CA 2383813 A1 CA2383813 A1 CA 2383813A1
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- Prior art keywords
- reflectors
- irradiating device
- emitter
- conduit
- fluid
- Prior art date
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V29/00—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems
- F21V29/50—Cooling arrangements
- F21V29/60—Cooling arrangements characterised by the use of a forced flow of gas, e.g. air
- F21V29/67—Cooling arrangements characterised by the use of a forced flow of gas, e.g. air characterised by the arrangement of fans
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V29/00—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems
- F21V29/50—Cooling arrangements
- F21V29/70—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks
- F21V29/74—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks with fins or blades
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- 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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21W—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO USES OR APPLICATIONS OF LIGHTING DEVICES OR SYSTEMS
- F21W2131/00—Use or application of lighting devices or systems not provided for in codes F21W2102/00-F21W2121/00
- F21W2131/40—Lighting for industrial, commercial, recreational or military use
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
- F21Y2103/00—Elongate light sources, e.g. fluorescent tubes
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Microbiology (AREA)
- Mechanical Engineering (AREA)
- Physical Or Chemical Processes And Apparatus (AREA)
- Radiation-Therapy Devices (AREA)
- Paper (AREA)
- Coating Apparatus (AREA)
- Drying Of Solid Materials (AREA)
Abstract
The invention concerns an irradiating device (1) comprising an electromagnetic radiation source having a radiation emitter (32) and two lateral reflectors (34). A fin (58) shaped like a projecting rib extends on the side of the rear surface (56) of each reflector (34) forming both a cooling surface and means for increasing the inertial moment of the profile of said reflector. A hook-shaped rim is provided at each end of the fin (58) allowing through pins (55) for fixing the reflectors (34) to positioning flanges (44). A winding cavity (17) carries the cooling fluid emerging on the side of the space exposed through one or several discharge outlets (80) capable of directing the fluid towards the median part of the exposed space. The invention is useful for drying all coatings on paper, cardboard, plastic and metal supports.
Description
s ELECTROMAGNETIC IRRADIATING DEVICE
Technical field of the invention 1o The invention concerns an electromagnetic irradiating device comprising ~ an electromagnetic radiation source comprising ~ a radiation emitter, ~ at least two lateral reflectors situated at a certain distance 1s from of the emitter on either side thereof, and comprising each a reflecting front surface opposite the emitter, and a rear surface, the emitter and the reflectors being laid out in order to direct the radiation towards a exposed space having a median part, both reflectors being isolated from one 2o another by a slot, ~ means for cooling the reflectors allowing a cooling fluid to flow from one side of the rear surface of the reflectors on the one hand, and through the slot on the side of the front surface of the reflectors on the other hand, 2s ~ and a carrying structure fitted with a recess for the radiation source.
Devices with visible and/or ultraviolet and/or infrared radiations for applications such as the drying of paints, varnishes, inks, the baking of powders such as epoxy, Rilsan (registered trademark), etc., and such as the 3o sterilization of solid coat products, foodstuff fluids, syrup, water etc.... and, more especially for the polymerization of inks andlor varnishes, radicalar and/or cationic and/or adhesive items and/or any other change in state generated mainly by radiations, in the field of Graphic Designing and for continuons treatment of coatings or leaf wise treatment of supports such as
Technical field of the invention 1o The invention concerns an electromagnetic irradiating device comprising ~ an electromagnetic radiation source comprising ~ a radiation emitter, ~ at least two lateral reflectors situated at a certain distance 1s from of the emitter on either side thereof, and comprising each a reflecting front surface opposite the emitter, and a rear surface, the emitter and the reflectors being laid out in order to direct the radiation towards a exposed space having a median part, both reflectors being isolated from one 2o another by a slot, ~ means for cooling the reflectors allowing a cooling fluid to flow from one side of the rear surface of the reflectors on the one hand, and through the slot on the side of the front surface of the reflectors on the other hand, 2s ~ and a carrying structure fitted with a recess for the radiation source.
Devices with visible and/or ultraviolet and/or infrared radiations for applications such as the drying of paints, varnishes, inks, the baking of powders such as epoxy, Rilsan (registered trademark), etc., and such as the 3o sterilization of solid coat products, foodstuff fluids, syrup, water etc.... and, more especially for the polymerization of inks andlor varnishes, radicalar and/or cationic and/or adhesive items and/or any other change in state generated mainly by radiations, in the field of Graphic Designing and for continuons treatment of coatings or leaf wise treatment of supports such as
2 s payer, cardboard, cotton or other synthetic products, plastic, PVC, PVB or metal bands made of aluminum or steel or other metals, or any other products used in print, security payer, stationery, cardboard mill, plastics technology, bags production, wrapping, textile, automotive industry, wood manufacture, electronics, credit cards, CD, etc., are known 1o Prior art The documents US 5861633, JP 07256190, W098/01700 and W099136939 describe an electromagnetic radiation source comprising irradiating means Is consisting of a radiation emitter and of two lateral reflectors situated at a certain distance from the emitter on either side thereof. Each reflector comprises a reflecting front surface opposite the emitter and a rear surface.
The emitter and the reflectors are laid out in order to direct the radiation towards an exposed space. Both reflectors are isolated from one another by a 2o slot and means for cooling the reflectors enable a cooling fluid to flow from one side of the rear surface of the reflectors on the one hand, and through the slot on the side of the front surface of the reflectors on the other hand. The reflectors consist of concave metal sheets whereof a face is reflecting. They form two portions of the saure ellipse, whereas the slot occupies the apex of 2s the ellipse. The emitting tube is situated parallel to the slot, and its axis is placed at the focus of the ellipse closest to the slot.
The thermal energy released by the radiation source simultaneously with the photochemical energy tends to dry the product subject to the radiation. If one 3o considers the example of an application to the printing industry, the source may perfectly irradiate zones of the payer whereon the product to be polymerized has not been printed, in which case the substrate (for example payer) being tiare, the air and the heat are responsible for localized drop in the humidity ratio, which will alter the structural behavior of the substrates.
The emitter and the reflectors are laid out in order to direct the radiation towards an exposed space. Both reflectors are isolated from one another by a 2o slot and means for cooling the reflectors enable a cooling fluid to flow from one side of the rear surface of the reflectors on the one hand, and through the slot on the side of the front surface of the reflectors on the other hand. The reflectors consist of concave metal sheets whereof a face is reflecting. They form two portions of the saure ellipse, whereas the slot occupies the apex of 2s the ellipse. The emitting tube is situated parallel to the slot, and its axis is placed at the focus of the ellipse closest to the slot.
The thermal energy released by the radiation source simultaneously with the photochemical energy tends to dry the product subject to the radiation. If one 3o considers the example of an application to the printing industry, the source may perfectly irradiate zones of the payer whereon the product to be polymerized has not been printed, in which case the substrate (for example payer) being tiare, the air and the heat are responsible for localized drop in the humidity ratio, which will alter the structural behavior of the substrates.
3 s This stress limits in certain applications the power of the device.
Besides, the thermal stresses exerted on the device properly speaking are enormous. The thermal deformations of the different elements, such the risk of devitrifying the envelope of the emitter, must be taken into account during 1o the sizing stage. 1t is rather difficult to design a housing liable to accommodate elements of the device in a confined space while enabling satisfactory ventilation.
1s Object of the invention An object of the invention is to enable sufficient cooling of an irradiating device of the previous type, in a confined space in a housing. Another object is to 2o provide for ventilation and, if possible, sufficient cooling of the space subject to radiation without detriment to the photonic energy released. Another object is for increasing the power of the radiation source, in a given volume, without exposing the radiation source itself and/or the item subject to the radiation to any excessive heating, by simple means.
2s According to the invention, these objects are met thanks to an irradiating device comprising:
- a cavity provided in said recess to carry the cooling fluid emerging on the side of the exposed space through one or several discharge outlets 3o capable of directing the fluid towards the median part of the exposed space, - a fin shaped like a projecting rib extending on the side of the rear surface of each reflector while forming simultaneously a cooling surface, and a means for increasing the inertial moment of the profile of said reflector,
Besides, the thermal stresses exerted on the device properly speaking are enormous. The thermal deformations of the different elements, such the risk of devitrifying the envelope of the emitter, must be taken into account during 1o the sizing stage. 1t is rather difficult to design a housing liable to accommodate elements of the device in a confined space while enabling satisfactory ventilation.
1s Object of the invention An object of the invention is to enable sufficient cooling of an irradiating device of the previous type, in a confined space in a housing. Another object is to 2o provide for ventilation and, if possible, sufficient cooling of the space subject to radiation without detriment to the photonic energy released. Another object is for increasing the power of the radiation source, in a given volume, without exposing the radiation source itself and/or the item subject to the radiation to any excessive heating, by simple means.
2s According to the invention, these objects are met thanks to an irradiating device comprising:
- a cavity provided in said recess to carry the cooling fluid emerging on the side of the exposed space through one or several discharge outlets 3o capable of directing the fluid towards the median part of the exposed space, - a fin shaped like a projecting rib extending on the side of the rear surface of each reflector while forming simultaneously a cooling surface, and a means for increasing the inertial moment of the profile of said reflector,
4 s - and a hook-shaped rim at each end of said fin letting through means for fixing reflectors to positioning flanges.
The median part of the exposed space is that which is subject to highest temperatures. Thanks to the invention, it is swept by the cooling fluid 1o emerging simultaneously through the discharge outlets and through the slot, which contributes to its cooling effect. The circulation of the cooling fluid between the rear surface of the reflectors and the carrying structure enables increased thermal exchange, and limits significantly the overheating of the carrying structure.
1s The cooling fluid may be the amblent air of the room or an inert gas, such as nitrogen, for the products to be inertized. Alternately, it may also be air with high relative humidity ratio, promoting the temperature drop by making use of the latent vaporization heat, or cold air whereof the temperature is lower than 20 20°C or lower than 0°C, or even demineralized liquid water at room temperature.
Advantageously, the reflectors are fitted, on the side of their rear surface, with a great number of cooling ribs, so that the exchange surface formed by the 2s rear surface of the reflectors is significantly larger than the reflecting surface formed by the front surface of the reflectors. The recess comprises suitably shaped walls, so that the cavity that they form with the rear surface of each reflector is a winding cavity for increasing considerably the thermâl exchange capacity. the reflector will be subject to a surface treatment by a nickel deposit 3o multiplying approx. tenfold the thermal emissivity capacity on the back of the reflector with respect to tiare aluminum. The small ribs and the complementary conformation of the carrying structure enable to increase the exchange surfaces simultaneously on the side of the reflector and on the side of the carrying structure, hence its higher cooling power.
S
According to an embodiment, the thickness of the winding cavity is substantially constant.
Advantageously, the carrying structure comprises a distributing conduit for the lo cooling fluid laid out parallel to the slot. The device comprises at least one channel linking each winding cavity to the conduit. The conduit is isolated from the cavity by an intermediate watt comprising one or several communication orifice forming the fluid channel linking the winding cavity to the conduit.
The cross-section of the discharge outlet(s) is substantially smaller than the is cross-section of the communication orifice(s).
Advantageously, the intermediate watt comprises at least one orifice linking the conduit to the slot. That orifice may besides be one of the previous communication orifices.
According to an embodiment, the rear surface of the reflector comprises at least one stop carrying on a complementary stop formed in the structure, the resultant of the forces caused by the pressure exerted by the fluid on the rear surface of the refiector tending to increase the force exerted by the stop on the 2s opposite stop. The device thus allows for good distribution of the mechanical and thermal stresses between the reflectors and the carrying structure.
Preferably, the device comprises the power-driven means normally externat to the irradiating device, involving forced circulation of the fluid in the conduit.
3o These power-driven means may be integrated to the carrying structure or isolated from said structure by a supply conduit of the fluid.
Advantageously, the device comprises a nebulizer projecting into the fluid a liquid as fin droplets. The nebulizer is preferably placed between the power-s driven means and the distributing conduit of the fluid. The nebulized liquid is sprayed, on the one hand in contact with the emitting tube when flowing round it and towards the front surface, and on the other hand when going through the cavity formed between the reflectors and the carrying structure, thus absorbing considerable heat corresponding to its own latent vaporization lo heat, and contributing to the cooling of the emitter and of the watts.
Advantageously, the vaporized liquid is demineralized water, which enables to control the humidity ratio in the exposed space and to prevent the objects subject to radiation from drying up or to accelerate the polymerization of certain inks or varnishes.
Is The electromagnetic radiation source forms a stand-atone monobloc assembly mounted to slip and resting on two orthogonal axes in the aeraulic carrying structure by means of spans sliding over the rests, and of rails sliding on bosses.
Brief description of the drawings Other advantages and characteristics of the invention will appear clearly from the following description of various embodiments of the invention, given for 2s non limiting exemplification purposes and represented on the appended drawings whereon ~ Figure 1 represents a transversal cross-section of a device according' to the invention ;
~ Figure 2 represents an exploded and detailed perspective of the device of Figure 1;
~ Figure 3 represents a side view of the device of Figure 1 ;
~ Figure 4 represents a cross-section of the portion of the device represented on Figure 2 ;
s ~ Figure 5 represents a detail of an embodiment variation of the invention.
Description of preferred embodiments With reference to Figures 1 to 4, an irradiating device 10 comprises a carrying lo structure 12 formed by an A-shaped profile of aluminum or of steel protected by an insulating coating, and an intermediate watt 14 delineating a rear volume forming a longitudinal conduit 16 of rectangular section and a front volume forming a recess 18 shaped approximately as a reverted U, open on one of its sides. One of the ends of the conduit 16 is fitted with an aeraulic ls mouth 20 for supplying the cooling fluid.
The aluminum profile has been subject to a hard anodic oxidization treatment of approx. 50 p, whereas the surface protection coat thus formed enables to sustain on the one hand all the mechanical shocks, and conferring on the 20 other hand to the part high electric resistance to leakage currents in the surrounding of the machine whereon the irradiating device is mounted, s to the possible short-circuit currents inside this very irradiating device. The ground convection of the irradiating device is isolated from the ground convection of the machine.
2s The intermediate watt 14 comprises the orifices 22 of variable sections laid out staggered on either side of a median plane 24 of the carrying structure, whereas these orifices 22 providing as many openings between the conduit 16 and the front recess 18 of the structure 12. The intermediate watt 14 is 3o fitted with two rests 26 placed on either side of the median plane 24 and protruding towards the inside of the front volume 18.
Both lateral watts delineating the front volume 18 of the structure comprise on their externat surface each a longitudinal groove 28 of circular section, ô
s corresponding to a boss 30 formed inside the front volume 18.
The front volume 18 of the structure 12 is occupied by of the irradiating means comprising an emitter 32 situated in the median plane of the structure, and two lateral reflectors 34 situated on either side of the emitter 32 and at a 1o certain distance thereof, symmetrically with respect to the median plane.
The emitter 32 is a lamp filled with Xenon or Krypton or Neon or any other gas having comparable properties, composed of a cylindrical tube 36 made of transparent quartz, inside which is laid out a plasmatic cylinder emitting in the is ultraviolet andlor in the visible and/or in the infrared range.
The interest of such an emitter lies in its pulse generation. The variation of the electric supply parameters of the generator enables to mix simultaneously and in required proportions, wavelengths UV with those of the infrared IR, and 2o that at each flash on the saure irradiated surface. With the succession of the flashes, it is also possible to provide a first flash UV, followed by a second flash IR, or vice versa, or still, a first flash UV combined with in a smaller proportion with a certain quantity IR, followed by another flash IR combined with in a smaller proportion a certain quantity UV on the saure irradiated 2s surface. Each of the axial ends of the tube is fitted with a ceramic connection piece 38 fitted with an externat electric connector 40 linked to an electrode inserted in the tube.
The emitter 32 may also advantageously consist of a lamp filled with Mercury 30 or metal iodide derivatives thereof.
At each longitudinal end of the front volume 18 of the carrying structure 12 is laid out a positioning flange 44, visible on Figures 2 and 4, and comprising lateral rails 46 which, in order to assume their positions, slide on both lateral s bosses 30. Each flange exhibits a U-shaped scalloping 48 whereof the opening is turned towards the intermediate watt, and an internat reflecting surface 48a of the flange 44 bringing the radiation of the source 36 towards the irradiated plane in order to eliminate the rim effects. That scalloping comprises a shoulder 47 visible on Figure 4, and a wider portion for lo positioning a punched retaining piece 49. This retaining piece 49 may also be advantageously replaced with a part made of Teflon or similar material whereof the thickness and the diameter are sufficient for the recess of the 'O' ring of the ceramic connection piece 38 having as externat geometrical contour the saure design as the part 44 thus providing the symmetry with Is respect to the axis 54.
As a variation, the retaining piece 44 may bee advantageously replaced in the externat plug 72 by a blind hole positioned in the axis of symmetry of the lamp.
The externat 72 and internat 74 plugs form the saure part molded of insulating 2o material. The ceramic connection piece of the lamp may then be maintained in the blind hole of the plug 74, either by an 'O' ring, or by an elastomer binder insensitive to the UV and temperature resistant.
The intermediate watt 14 comprises, at the saure height as the convection 2s between the tait of the electrode and the ceramic convection piece, a large opening 50. The flange is itself punched by the openings 41.
Each of the reflectors 34 consists of a metal profile, notably of aluminurn or steel, comprising a reflecting concave front surface 52. Seen as cross-3o sections in a plane perpendicular to the axis 54 of the cylindrical tube 36, the reflecting surfaces 52 of the two reflectors 34 match the envelope of the saure ellipse whereof the focus would be situated on the axis 54 of the cylindrical tube. Each of the reflectors 34 is fitted, on the side of its rear surface 56, with a large main fin 58 and with cooling ribs 60 forming smaller roughnesses. A
s span 62 contributes to the positioning of the reflector in the carrying structure 12 and stop against the corresponding rest 26 of the intermediate wall 14.
Two adjacent edges 64 of both reflectors 34 delineate a longitudinal slot 66 parallel to the axis 54 of the tube 36. a space is formed between the slot 66 1o and the intermediate wall 14, emerging laterally on the orifices 22. In the vicinity of the aeraulic mouth 20, the speed of air in the conduit 16 is higher than at the other opposite end at the electric convection tapping 78, where speed tends to be equal to zero. Thus, to obtain uniform air distribution along the aeraulic mouth 20, the air pressure increasing as the speed decreases, Is the through section of the orifices 22 is larger where the pressure is reduced.
The through section of these orifices 22 reduces gradually up to the other opposite end 78 where the pressure is higher, in order to make the transversal air flow homogeneous after the intermediate wall 14.
2o Both flanges 44 receive the ends of the fateral reflectors 34 in order to position said reflectors longitudinally in the front recess 18.
The cooling air is carried at the back of the reflectors 34 with a pressure greater than the foad loss caused by the circulation of air through the air path 2s 17. The presence of the rib 58 and of the hook-shaped end rim 59 increases the inertial moment of the reflector 34 with respect to the thrust axis of the air pressure at the back of the reflector, in order to eliminate any deformation of the reflector 34 made of extruded profile. Moreover, the reflector 34 for long radiation devices (up to 4 meters), significantly in the industries producing 3o cardboard or textile machine widths, is maintained rigorously rectilinear by the rib 58, whereas the reflector rests 34 on the stop 26 of the intermediate wall 14. Both reflectors 34 remain perfectly symmetric and immobile with respect to the axis 24, as the opposite thrusts negate each other.
s The rear of each reflector 34 is shaped according to a very efficient heat exchanger. To do so, the reflector assembly 34 is covered with a coat of nickel enabling to multiply by 10 the calorific emissivity coefficient with respect to a tiare aluminum surface. Moreover, wherever the cooling air sweeps over the back of the reflector 34, the irradiating surface has been increased by the small ribs 60 staggered at three points: the top of the reflector, on the rib and on the slope at 15° in the median and low part of the reflector 34.
The intermediate watt 14 retains in its median part by the recess 15 an aluminum reflecting longitudinal blade 68, maintained by two rests 15' and Is facing the tube 36 through the slot 66.
Each end of the carrying structure 12 is equipped moreover with an externat plug 72 and an internat plug 74, visible on Figures 2 and 4. The externat plug 72 closes the conduit 16. 1t is fitted with four studs 76 inserted in circular 2o grooves of the carrying structure. The internat plug 74 is round and therefore changes the direction of flow of the cooling fluid by 90° and, by its construction, guarantees sufficient electric insulation to seal the electric connection point of the lamp with its supply Gable. The plugs 72, 74 are made of plastic material, in order to match the shapes of the profile by engaging into 2s said profile, while reinforcing electric insulation.
The end of the structure opposite the aeraulic mouth is fitted with a multipin electric tapping 78, represented on Figure 5, for lame supply voltages smâller than or of the order of 3,000 Volts. Beyond these values, i.e. up to 10,000 Volts 30 or above, the electric conductors go through the ventilation sheath which ensures additional insulation as regards human safety.
The aeraulic mouth 20 is connected by a piping 99 downstream of a fan 96, represented schematically on Figure 3. Optionally, the device is fitted besides s with a spray 98 situated at the discharge of the fan, which enables discharging towards the aeraulic mouth 20 and the air conduit 16 containing a mist of thin water droplets in suspension. According to a variation, the spray 98 may be laid out directly in the vicinity of the aeraulic mouth 20.
lo The device is assembled as follows:
The longitudinal ends of the reflectors 34 are integral with the flanges 44 by means of eight pins 53 housed in the holes 55 arranged in the end returns 59, and going through the holes 45 of the two flanges 44. The electric ls connection of the emitter 32 at one of the ends of the irradiating device, the electric supply wire of the other side of the larnp is brought back to the side of the elèctric connection through the hole 57 of the reflector 34. The hole 57 of the other reflector 34 is used to accommodate a bare ground conducting wire.
2o Thus, both end flanges 44, both reflectors 34 and the emitter 32 form a stand-alone sub-assembly, mechanically and electrically integral, which may be inserted by sliding along the bosses 30 in the front volume 18 of the structure 12, whereas the spans 62 slide on the rests 26. This sub-assembly i s therefore vastly dissociated, from a mechanical, electrical, thermal and 2s aeraulic viewpoint, of the carrying structure 12. A continuous space is formed between each lateral reflector 34 and the lateral watt opposite the carrying structure 12, this space emerging on the front side by a slot 80 situated between the front edge of each reflector and the corresponding edge of the watt of the carrying structure 12, et, on the rear side, through the orifices 3o drilled in the lateral watt. Once this sub-assembly has been inserted and positioned in the carrying structure 12, the pins 53 which maintain the reflectors 34 integral with the flange 44 emerge on the rear surface thereof over such a length that they stop against the internat surface 73 of the internat plug 74 whereof the plastic material is sufficiently elastic to absorb the s dilatation of the reflectors 34.
The externat grooves 28 of the carrying structure enable to insert the device as a drawer in an element of machinery fitted with complementary parallel rails. The compactness, the handiness and the unity of the assembly enable to contemplate as parts exchange the complete replacement of the device during maintenance operations or calls, rather than a repair or partial replacement of one of the components of the device.
In operation, the thermal and aeraulic behavior of the device is as follows:
Is A cooling fluid is injected in the conduit through the mouth 20. The cross-section of the orifices 22 differs from the end comprising the mouth 20 towards the opposite end, in order to compensate for the pressure variation along the conduit 16 and to cause the fluid to flow at substantially constant 2o rate through the orifices 22. A portion of the fluid flows through the slot towards the space exposed to the radiation, where it partakes of a thermal exchange with the reflecting surfaces 52 of the reflectors and with the tube 36.
Another portion of the flow follows the winding path formed between the fateral watts of the structure 12 and the rear surfaces 56 of the reflectors 34 and 2s emerging through the slots 80, which direct the outgoing flow approximately towards the median plane 24 of the irradiated space. This portion of the fluid performs a thermal exchange with the rear surface 56 of the reflectors, which is important because of the lerigth of the distance 17 covered which contributes simultaneously to increase the exchange surface and to slow the 3o fluid down. The small ribs 60 and the nickel coating also contribute to increase this thermal exchange.
A the ends of the emitter 32, the openings 50 and 41 enable the fluid to flow and hence the cooling to take place.
s The reflecting blade 68 enables reflection of the radiation from the slot 66.
1t also insulates the intermediate wall 14 from any contact with the infrared radiations which might cause localized overheating of the profile making up the carrying structure 12 and generate heterogeneous deformations of the 1o elements.
The different thermal dilatations of the reflectors 34 and of the structure 12 cause the flanges 44 to slide with respect to the bosses 30, as well as the spans 62 with respect to the rests 26, whereas the displacement of the ends 1s of the irradiating assembly is absorbed by the elasticity of the internat plugs.
The rests 26 oppose the mechanical thrust generated by the pressurized fluid along the rear surfaces of the reflectors 34, and thus guarantee the existence of a slot 66 of constant width and homogeneous between the adjacent edges 20 64 of both reflectors 34, regardless of the aeraulic thrust.
The word 'cooling' used so far is purposely general. Indeed, if the radiation emitter comprises plasmas sensitive to thermal shocks, such as for example when lighting a lamp, or high temperature gradient of the quartz envelope, 2s which affects essentially plasmas formed by Mercury, Gallium andlor Lead, Iron and/or Cobalt and/or other metal iodides of similar nature, then the cooling of the emitter will be restrained to the usage of amblent air in the room or of neutral gases, such as nitrogen, for products to be inertized.
3o Conversely, if the radiation emitter comprises plasmas quasi insensitive to thermal shocks, such as those formed by Xenon, Krypton or by other associated ionizing gases of the saure nature, whereas, on top of the amblent air, one may use as a replacement either a neutral gas, inherently anti-oxidizing inasmuch as the emitter is with cold plasma, or inasmuch as the hot ls s plasma emitter is fitted with a jacket of demineralized cooling water as it has been described previously, i.e. air at relative humidity ratio thanks to the water spray, preferably demineralized water, promoting the temperature drop by using the latent vaporization heat, or air at a temperature lower than 20°C or lower than 0°C, even demineralized water at room temperature, wherein the i s io immersed the irradiating element. Demineralized water offers electric resistivity enabling the conducting ends of the lamp to corne in contact with the cooling water without any risks of electric faults.
ts Spraying water through the slot 66 provides high temperature gradient between the internat watt of the quartz tube 36 which is in contact with the plasma at approx. 5,000°K to 7,000°K, and the externat watt which may be in direct contact with water at 20°C without modifying the plasma nor its spectrum, nor the quantity of energy released in the wavelengths considered.
2o One shall therefore use the latent heat of the water in suspension in the cooling air at pre-set temperature, significantly amblent, in contact with the quartz tube of the emitter.
Besides, it should be noted that the thermal energy released simultaneously 2s to the photochemical energy tends to dry up the product subject to radiation. If one takes the example of an application to the printing industry, the irradiating device 10 may quite well irradiate the zones of the paper whereon the product to be polymerized has not been printed, in which case the substrate (for example paper) being bave, the air and the heat cause localized drop of the 3o humidity ratio, which will affect the structural behavior of the substrate.
1t is then possible to avoid any drying effect by increasing the humidity ratio of the cooling air that is propelled onto the irradiated surface of the product.
One should then direct the discharged air towards the median part of the zone s subject to radiation. The air going through the slot 66 heads naturally in that region. The discharge slots 80 formed between the lateral reflectors and the rims of the lateral walls of the carrying structure 12 are shaped in order to direct towards the median plane 24 of the carrying structure 12 the discharged air of the winding path formed between the lateral walls of the structure 12 1o and the rear surface 56 of the reflectors.
Naturally diverse variations are possible without departing from the framework of the invention.
1s An embodiment variation is presented on Figure 5. When the structure exceeds a certain length (for example 1 meter), the thrust exerted by the air coming out of the slot 66 and arriving at the cylindrical tube 36 may cause deformation of the tube 36. To avoid untimely displacement of the emission focus, one may arrange at regular intervals a maintenance loop 90 with one or 2o several spires. This loop goes round the tube 36 and through the rounded edge 64 of the reflectors 34 and through the thickness thereof where it is maintained a (high temperature type, ceramic type) glue plug 92.
The wire 94 of the loop 90 is of very small diameter to provide the necessary 2s flexibility (1110th mm up to approx. 10 pm). 1t is capable of resisting temperatures greater than 900° C. The wire may be of chrome /
molybdenum, or better of quartz fibers which are of the saure nature as the tube of the lamp, transparent and with a small dilatation ratio.
3o The conduit 16 forming the rear volume of the carrying structure may be of rectangular section, as specified in the embodiment, but also of any geometrical shape, for example circular, ovoid or square.
The carrying structure 12 may be formed of any metal or compound material s exhibiting the requested mechanical, electric and thermal behavior characteristics.
The conduit 16 may be isolated from the carrying structure 12 and added thereon, which enables to form the conduit 16 of a material different from that 1o of the structure 12. The carrying structure may thus have for example an H-shaped section, with a recess for the irradiating means, and a recess for an added-on tubular conduit of duroplastic material. In such a configuration, it is useful to provide maintenance flanges of the conduit which do not form too big thermal bridges between the structure and the conduit.
1s The form of the concave reflection surface formed by both reflectors 34 may be, seen in a plane perpendicular to the axis of the tube, a parabola whereof the focus would be the axis of the cylindrical tube. The tube 36 may be slightly offset with respect to the focus of the concave surface. The reflectors 34 may 2o also take a shape close to that of an ellipse or a parabola, for example a broken shape formed by of the arcs of circles andlor the line segments.
Besides, for manufacturing purposes (surface treatments), the length of the reflectors 34 may not exceed a certain size. To obtain a structure 12 of large 2s dimension (for example several meters), it is possible to lay out abutting sections of reflectors thereby providing a homogeneous longitudinal reflection surface.
The emission method of the radiation is not so restrictive. For example, the 30 lamp of the emitter may be either filled with a low pressure gas such as Neon, or fitted with an axial filament aligned on the focal line and emitting in the infrared and/or the visible range, thereby replacing the plasmatic cylinder.
The quartz tube may be replaced with a glass tube. The tube may not be rigorously cylindrical.
The mouth 20 for supplying the conduit with fluid may be placed in one of the externat plugs, in the longitudinal axis of the carrying structure. 1t may also be laid out on a lateral surface. 1t may also be positioned halfway between the longitudinal ends of the conduit, which involves naturally in this case a lo distribution that is difFerent from the orifices.
According to another variation, the emitter 32 may be water-cooled and the cooling fluid through the slot 66 is an anti-oxidizing inert gas, significantly nitrogen.
The median part of the exposed space is that which is subject to highest temperatures. Thanks to the invention, it is swept by the cooling fluid 1o emerging simultaneously through the discharge outlets and through the slot, which contributes to its cooling effect. The circulation of the cooling fluid between the rear surface of the reflectors and the carrying structure enables increased thermal exchange, and limits significantly the overheating of the carrying structure.
1s The cooling fluid may be the amblent air of the room or an inert gas, such as nitrogen, for the products to be inertized. Alternately, it may also be air with high relative humidity ratio, promoting the temperature drop by making use of the latent vaporization heat, or cold air whereof the temperature is lower than 20 20°C or lower than 0°C, or even demineralized liquid water at room temperature.
Advantageously, the reflectors are fitted, on the side of their rear surface, with a great number of cooling ribs, so that the exchange surface formed by the 2s rear surface of the reflectors is significantly larger than the reflecting surface formed by the front surface of the reflectors. The recess comprises suitably shaped walls, so that the cavity that they form with the rear surface of each reflector is a winding cavity for increasing considerably the thermâl exchange capacity. the reflector will be subject to a surface treatment by a nickel deposit 3o multiplying approx. tenfold the thermal emissivity capacity on the back of the reflector with respect to tiare aluminum. The small ribs and the complementary conformation of the carrying structure enable to increase the exchange surfaces simultaneously on the side of the reflector and on the side of the carrying structure, hence its higher cooling power.
S
According to an embodiment, the thickness of the winding cavity is substantially constant.
Advantageously, the carrying structure comprises a distributing conduit for the lo cooling fluid laid out parallel to the slot. The device comprises at least one channel linking each winding cavity to the conduit. The conduit is isolated from the cavity by an intermediate watt comprising one or several communication orifice forming the fluid channel linking the winding cavity to the conduit.
The cross-section of the discharge outlet(s) is substantially smaller than the is cross-section of the communication orifice(s).
Advantageously, the intermediate watt comprises at least one orifice linking the conduit to the slot. That orifice may besides be one of the previous communication orifices.
According to an embodiment, the rear surface of the reflector comprises at least one stop carrying on a complementary stop formed in the structure, the resultant of the forces caused by the pressure exerted by the fluid on the rear surface of the refiector tending to increase the force exerted by the stop on the 2s opposite stop. The device thus allows for good distribution of the mechanical and thermal stresses between the reflectors and the carrying structure.
Preferably, the device comprises the power-driven means normally externat to the irradiating device, involving forced circulation of the fluid in the conduit.
3o These power-driven means may be integrated to the carrying structure or isolated from said structure by a supply conduit of the fluid.
Advantageously, the device comprises a nebulizer projecting into the fluid a liquid as fin droplets. The nebulizer is preferably placed between the power-s driven means and the distributing conduit of the fluid. The nebulized liquid is sprayed, on the one hand in contact with the emitting tube when flowing round it and towards the front surface, and on the other hand when going through the cavity formed between the reflectors and the carrying structure, thus absorbing considerable heat corresponding to its own latent vaporization lo heat, and contributing to the cooling of the emitter and of the watts.
Advantageously, the vaporized liquid is demineralized water, which enables to control the humidity ratio in the exposed space and to prevent the objects subject to radiation from drying up or to accelerate the polymerization of certain inks or varnishes.
Is The electromagnetic radiation source forms a stand-atone monobloc assembly mounted to slip and resting on two orthogonal axes in the aeraulic carrying structure by means of spans sliding over the rests, and of rails sliding on bosses.
Brief description of the drawings Other advantages and characteristics of the invention will appear clearly from the following description of various embodiments of the invention, given for 2s non limiting exemplification purposes and represented on the appended drawings whereon ~ Figure 1 represents a transversal cross-section of a device according' to the invention ;
~ Figure 2 represents an exploded and detailed perspective of the device of Figure 1;
~ Figure 3 represents a side view of the device of Figure 1 ;
~ Figure 4 represents a cross-section of the portion of the device represented on Figure 2 ;
s ~ Figure 5 represents a detail of an embodiment variation of the invention.
Description of preferred embodiments With reference to Figures 1 to 4, an irradiating device 10 comprises a carrying lo structure 12 formed by an A-shaped profile of aluminum or of steel protected by an insulating coating, and an intermediate watt 14 delineating a rear volume forming a longitudinal conduit 16 of rectangular section and a front volume forming a recess 18 shaped approximately as a reverted U, open on one of its sides. One of the ends of the conduit 16 is fitted with an aeraulic ls mouth 20 for supplying the cooling fluid.
The aluminum profile has been subject to a hard anodic oxidization treatment of approx. 50 p, whereas the surface protection coat thus formed enables to sustain on the one hand all the mechanical shocks, and conferring on the 20 other hand to the part high electric resistance to leakage currents in the surrounding of the machine whereon the irradiating device is mounted, s to the possible short-circuit currents inside this very irradiating device. The ground convection of the irradiating device is isolated from the ground convection of the machine.
2s The intermediate watt 14 comprises the orifices 22 of variable sections laid out staggered on either side of a median plane 24 of the carrying structure, whereas these orifices 22 providing as many openings between the conduit 16 and the front recess 18 of the structure 12. The intermediate watt 14 is 3o fitted with two rests 26 placed on either side of the median plane 24 and protruding towards the inside of the front volume 18.
Both lateral watts delineating the front volume 18 of the structure comprise on their externat surface each a longitudinal groove 28 of circular section, ô
s corresponding to a boss 30 formed inside the front volume 18.
The front volume 18 of the structure 12 is occupied by of the irradiating means comprising an emitter 32 situated in the median plane of the structure, and two lateral reflectors 34 situated on either side of the emitter 32 and at a 1o certain distance thereof, symmetrically with respect to the median plane.
The emitter 32 is a lamp filled with Xenon or Krypton or Neon or any other gas having comparable properties, composed of a cylindrical tube 36 made of transparent quartz, inside which is laid out a plasmatic cylinder emitting in the is ultraviolet andlor in the visible and/or in the infrared range.
The interest of such an emitter lies in its pulse generation. The variation of the electric supply parameters of the generator enables to mix simultaneously and in required proportions, wavelengths UV with those of the infrared IR, and 2o that at each flash on the saure irradiated surface. With the succession of the flashes, it is also possible to provide a first flash UV, followed by a second flash IR, or vice versa, or still, a first flash UV combined with in a smaller proportion with a certain quantity IR, followed by another flash IR combined with in a smaller proportion a certain quantity UV on the saure irradiated 2s surface. Each of the axial ends of the tube is fitted with a ceramic connection piece 38 fitted with an externat electric connector 40 linked to an electrode inserted in the tube.
The emitter 32 may also advantageously consist of a lamp filled with Mercury 30 or metal iodide derivatives thereof.
At each longitudinal end of the front volume 18 of the carrying structure 12 is laid out a positioning flange 44, visible on Figures 2 and 4, and comprising lateral rails 46 which, in order to assume their positions, slide on both lateral s bosses 30. Each flange exhibits a U-shaped scalloping 48 whereof the opening is turned towards the intermediate watt, and an internat reflecting surface 48a of the flange 44 bringing the radiation of the source 36 towards the irradiated plane in order to eliminate the rim effects. That scalloping comprises a shoulder 47 visible on Figure 4, and a wider portion for lo positioning a punched retaining piece 49. This retaining piece 49 may also be advantageously replaced with a part made of Teflon or similar material whereof the thickness and the diameter are sufficient for the recess of the 'O' ring of the ceramic connection piece 38 having as externat geometrical contour the saure design as the part 44 thus providing the symmetry with Is respect to the axis 54.
As a variation, the retaining piece 44 may bee advantageously replaced in the externat plug 72 by a blind hole positioned in the axis of symmetry of the lamp.
The externat 72 and internat 74 plugs form the saure part molded of insulating 2o material. The ceramic connection piece of the lamp may then be maintained in the blind hole of the plug 74, either by an 'O' ring, or by an elastomer binder insensitive to the UV and temperature resistant.
The intermediate watt 14 comprises, at the saure height as the convection 2s between the tait of the electrode and the ceramic convection piece, a large opening 50. The flange is itself punched by the openings 41.
Each of the reflectors 34 consists of a metal profile, notably of aluminurn or steel, comprising a reflecting concave front surface 52. Seen as cross-3o sections in a plane perpendicular to the axis 54 of the cylindrical tube 36, the reflecting surfaces 52 of the two reflectors 34 match the envelope of the saure ellipse whereof the focus would be situated on the axis 54 of the cylindrical tube. Each of the reflectors 34 is fitted, on the side of its rear surface 56, with a large main fin 58 and with cooling ribs 60 forming smaller roughnesses. A
s span 62 contributes to the positioning of the reflector in the carrying structure 12 and stop against the corresponding rest 26 of the intermediate wall 14.
Two adjacent edges 64 of both reflectors 34 delineate a longitudinal slot 66 parallel to the axis 54 of the tube 36. a space is formed between the slot 66 1o and the intermediate wall 14, emerging laterally on the orifices 22. In the vicinity of the aeraulic mouth 20, the speed of air in the conduit 16 is higher than at the other opposite end at the electric convection tapping 78, where speed tends to be equal to zero. Thus, to obtain uniform air distribution along the aeraulic mouth 20, the air pressure increasing as the speed decreases, Is the through section of the orifices 22 is larger where the pressure is reduced.
The through section of these orifices 22 reduces gradually up to the other opposite end 78 where the pressure is higher, in order to make the transversal air flow homogeneous after the intermediate wall 14.
2o Both flanges 44 receive the ends of the fateral reflectors 34 in order to position said reflectors longitudinally in the front recess 18.
The cooling air is carried at the back of the reflectors 34 with a pressure greater than the foad loss caused by the circulation of air through the air path 2s 17. The presence of the rib 58 and of the hook-shaped end rim 59 increases the inertial moment of the reflector 34 with respect to the thrust axis of the air pressure at the back of the reflector, in order to eliminate any deformation of the reflector 34 made of extruded profile. Moreover, the reflector 34 for long radiation devices (up to 4 meters), significantly in the industries producing 3o cardboard or textile machine widths, is maintained rigorously rectilinear by the rib 58, whereas the reflector rests 34 on the stop 26 of the intermediate wall 14. Both reflectors 34 remain perfectly symmetric and immobile with respect to the axis 24, as the opposite thrusts negate each other.
s The rear of each reflector 34 is shaped according to a very efficient heat exchanger. To do so, the reflector assembly 34 is covered with a coat of nickel enabling to multiply by 10 the calorific emissivity coefficient with respect to a tiare aluminum surface. Moreover, wherever the cooling air sweeps over the back of the reflector 34, the irradiating surface has been increased by the small ribs 60 staggered at three points: the top of the reflector, on the rib and on the slope at 15° in the median and low part of the reflector 34.
The intermediate watt 14 retains in its median part by the recess 15 an aluminum reflecting longitudinal blade 68, maintained by two rests 15' and Is facing the tube 36 through the slot 66.
Each end of the carrying structure 12 is equipped moreover with an externat plug 72 and an internat plug 74, visible on Figures 2 and 4. The externat plug 72 closes the conduit 16. 1t is fitted with four studs 76 inserted in circular 2o grooves of the carrying structure. The internat plug 74 is round and therefore changes the direction of flow of the cooling fluid by 90° and, by its construction, guarantees sufficient electric insulation to seal the electric connection point of the lamp with its supply Gable. The plugs 72, 74 are made of plastic material, in order to match the shapes of the profile by engaging into 2s said profile, while reinforcing electric insulation.
The end of the structure opposite the aeraulic mouth is fitted with a multipin electric tapping 78, represented on Figure 5, for lame supply voltages smâller than or of the order of 3,000 Volts. Beyond these values, i.e. up to 10,000 Volts 30 or above, the electric conductors go through the ventilation sheath which ensures additional insulation as regards human safety.
The aeraulic mouth 20 is connected by a piping 99 downstream of a fan 96, represented schematically on Figure 3. Optionally, the device is fitted besides s with a spray 98 situated at the discharge of the fan, which enables discharging towards the aeraulic mouth 20 and the air conduit 16 containing a mist of thin water droplets in suspension. According to a variation, the spray 98 may be laid out directly in the vicinity of the aeraulic mouth 20.
lo The device is assembled as follows:
The longitudinal ends of the reflectors 34 are integral with the flanges 44 by means of eight pins 53 housed in the holes 55 arranged in the end returns 59, and going through the holes 45 of the two flanges 44. The electric ls connection of the emitter 32 at one of the ends of the irradiating device, the electric supply wire of the other side of the larnp is brought back to the side of the elèctric connection through the hole 57 of the reflector 34. The hole 57 of the other reflector 34 is used to accommodate a bare ground conducting wire.
2o Thus, both end flanges 44, both reflectors 34 and the emitter 32 form a stand-alone sub-assembly, mechanically and electrically integral, which may be inserted by sliding along the bosses 30 in the front volume 18 of the structure 12, whereas the spans 62 slide on the rests 26. This sub-assembly i s therefore vastly dissociated, from a mechanical, electrical, thermal and 2s aeraulic viewpoint, of the carrying structure 12. A continuous space is formed between each lateral reflector 34 and the lateral watt opposite the carrying structure 12, this space emerging on the front side by a slot 80 situated between the front edge of each reflector and the corresponding edge of the watt of the carrying structure 12, et, on the rear side, through the orifices 3o drilled in the lateral watt. Once this sub-assembly has been inserted and positioned in the carrying structure 12, the pins 53 which maintain the reflectors 34 integral with the flange 44 emerge on the rear surface thereof over such a length that they stop against the internat surface 73 of the internat plug 74 whereof the plastic material is sufficiently elastic to absorb the s dilatation of the reflectors 34.
The externat grooves 28 of the carrying structure enable to insert the device as a drawer in an element of machinery fitted with complementary parallel rails. The compactness, the handiness and the unity of the assembly enable to contemplate as parts exchange the complete replacement of the device during maintenance operations or calls, rather than a repair or partial replacement of one of the components of the device.
In operation, the thermal and aeraulic behavior of the device is as follows:
Is A cooling fluid is injected in the conduit through the mouth 20. The cross-section of the orifices 22 differs from the end comprising the mouth 20 towards the opposite end, in order to compensate for the pressure variation along the conduit 16 and to cause the fluid to flow at substantially constant 2o rate through the orifices 22. A portion of the fluid flows through the slot towards the space exposed to the radiation, where it partakes of a thermal exchange with the reflecting surfaces 52 of the reflectors and with the tube 36.
Another portion of the flow follows the winding path formed between the fateral watts of the structure 12 and the rear surfaces 56 of the reflectors 34 and 2s emerging through the slots 80, which direct the outgoing flow approximately towards the median plane 24 of the irradiated space. This portion of the fluid performs a thermal exchange with the rear surface 56 of the reflectors, which is important because of the lerigth of the distance 17 covered which contributes simultaneously to increase the exchange surface and to slow the 3o fluid down. The small ribs 60 and the nickel coating also contribute to increase this thermal exchange.
A the ends of the emitter 32, the openings 50 and 41 enable the fluid to flow and hence the cooling to take place.
s The reflecting blade 68 enables reflection of the radiation from the slot 66.
1t also insulates the intermediate wall 14 from any contact with the infrared radiations which might cause localized overheating of the profile making up the carrying structure 12 and generate heterogeneous deformations of the 1o elements.
The different thermal dilatations of the reflectors 34 and of the structure 12 cause the flanges 44 to slide with respect to the bosses 30, as well as the spans 62 with respect to the rests 26, whereas the displacement of the ends 1s of the irradiating assembly is absorbed by the elasticity of the internat plugs.
The rests 26 oppose the mechanical thrust generated by the pressurized fluid along the rear surfaces of the reflectors 34, and thus guarantee the existence of a slot 66 of constant width and homogeneous between the adjacent edges 20 64 of both reflectors 34, regardless of the aeraulic thrust.
The word 'cooling' used so far is purposely general. Indeed, if the radiation emitter comprises plasmas sensitive to thermal shocks, such as for example when lighting a lamp, or high temperature gradient of the quartz envelope, 2s which affects essentially plasmas formed by Mercury, Gallium andlor Lead, Iron and/or Cobalt and/or other metal iodides of similar nature, then the cooling of the emitter will be restrained to the usage of amblent air in the room or of neutral gases, such as nitrogen, for products to be inertized.
3o Conversely, if the radiation emitter comprises plasmas quasi insensitive to thermal shocks, such as those formed by Xenon, Krypton or by other associated ionizing gases of the saure nature, whereas, on top of the amblent air, one may use as a replacement either a neutral gas, inherently anti-oxidizing inasmuch as the emitter is with cold plasma, or inasmuch as the hot ls s plasma emitter is fitted with a jacket of demineralized cooling water as it has been described previously, i.e. air at relative humidity ratio thanks to the water spray, preferably demineralized water, promoting the temperature drop by using the latent vaporization heat, or air at a temperature lower than 20°C or lower than 0°C, even demineralized water at room temperature, wherein the i s io immersed the irradiating element. Demineralized water offers electric resistivity enabling the conducting ends of the lamp to corne in contact with the cooling water without any risks of electric faults.
ts Spraying water through the slot 66 provides high temperature gradient between the internat watt of the quartz tube 36 which is in contact with the plasma at approx. 5,000°K to 7,000°K, and the externat watt which may be in direct contact with water at 20°C without modifying the plasma nor its spectrum, nor the quantity of energy released in the wavelengths considered.
2o One shall therefore use the latent heat of the water in suspension in the cooling air at pre-set temperature, significantly amblent, in contact with the quartz tube of the emitter.
Besides, it should be noted that the thermal energy released simultaneously 2s to the photochemical energy tends to dry up the product subject to radiation. If one takes the example of an application to the printing industry, the irradiating device 10 may quite well irradiate the zones of the paper whereon the product to be polymerized has not been printed, in which case the substrate (for example paper) being bave, the air and the heat cause localized drop of the 3o humidity ratio, which will affect the structural behavior of the substrate.
1t is then possible to avoid any drying effect by increasing the humidity ratio of the cooling air that is propelled onto the irradiated surface of the product.
One should then direct the discharged air towards the median part of the zone s subject to radiation. The air going through the slot 66 heads naturally in that region. The discharge slots 80 formed between the lateral reflectors and the rims of the lateral walls of the carrying structure 12 are shaped in order to direct towards the median plane 24 of the carrying structure 12 the discharged air of the winding path formed between the lateral walls of the structure 12 1o and the rear surface 56 of the reflectors.
Naturally diverse variations are possible without departing from the framework of the invention.
1s An embodiment variation is presented on Figure 5. When the structure exceeds a certain length (for example 1 meter), the thrust exerted by the air coming out of the slot 66 and arriving at the cylindrical tube 36 may cause deformation of the tube 36. To avoid untimely displacement of the emission focus, one may arrange at regular intervals a maintenance loop 90 with one or 2o several spires. This loop goes round the tube 36 and through the rounded edge 64 of the reflectors 34 and through the thickness thereof where it is maintained a (high temperature type, ceramic type) glue plug 92.
The wire 94 of the loop 90 is of very small diameter to provide the necessary 2s flexibility (1110th mm up to approx. 10 pm). 1t is capable of resisting temperatures greater than 900° C. The wire may be of chrome /
molybdenum, or better of quartz fibers which are of the saure nature as the tube of the lamp, transparent and with a small dilatation ratio.
3o The conduit 16 forming the rear volume of the carrying structure may be of rectangular section, as specified in the embodiment, but also of any geometrical shape, for example circular, ovoid or square.
The carrying structure 12 may be formed of any metal or compound material s exhibiting the requested mechanical, electric and thermal behavior characteristics.
The conduit 16 may be isolated from the carrying structure 12 and added thereon, which enables to form the conduit 16 of a material different from that 1o of the structure 12. The carrying structure may thus have for example an H-shaped section, with a recess for the irradiating means, and a recess for an added-on tubular conduit of duroplastic material. In such a configuration, it is useful to provide maintenance flanges of the conduit which do not form too big thermal bridges between the structure and the conduit.
1s The form of the concave reflection surface formed by both reflectors 34 may be, seen in a plane perpendicular to the axis of the tube, a parabola whereof the focus would be the axis of the cylindrical tube. The tube 36 may be slightly offset with respect to the focus of the concave surface. The reflectors 34 may 2o also take a shape close to that of an ellipse or a parabola, for example a broken shape formed by of the arcs of circles andlor the line segments.
Besides, for manufacturing purposes (surface treatments), the length of the reflectors 34 may not exceed a certain size. To obtain a structure 12 of large 2s dimension (for example several meters), it is possible to lay out abutting sections of reflectors thereby providing a homogeneous longitudinal reflection surface.
The emission method of the radiation is not so restrictive. For example, the 30 lamp of the emitter may be either filled with a low pressure gas such as Neon, or fitted with an axial filament aligned on the focal line and emitting in the infrared and/or the visible range, thereby replacing the plasmatic cylinder.
The quartz tube may be replaced with a glass tube. The tube may not be rigorously cylindrical.
The mouth 20 for supplying the conduit with fluid may be placed in one of the externat plugs, in the longitudinal axis of the carrying structure. 1t may also be laid out on a lateral surface. 1t may also be positioned halfway between the longitudinal ends of the conduit, which involves naturally in this case a lo distribution that is difFerent from the orifices.
According to another variation, the emitter 32 may be water-cooled and the cooling fluid through the slot 66 is an anti-oxidizing inert gas, significantly nitrogen.
Claims (11)
1. An irradiating device (10) comprising :
.cndot. an electromagnetic radiation source comprising :
.cndot. a radiation emitter (32), .cndot. at least two lateral reflectors (34) situated at a ceriain distance from of the emitter (32) on either side thereof, and comprising each a reflecting front surface (52) opposite the emitter (32), and a rear surface (56), the emitter (32) and the reflectors (34) being laid out in order to direct the radiation towards an exposed space having a median part, both reflectors (34) being isolated from one another by a slot (66), .cndot. means for cooling the reflectors (34) enabling a cooling fluid to flow on the side of the rear surface (56) of the reflectors on the one hand, and through the slot (66) on the side of the front surface (52) of the reflectors on the other hand, .cndot. and a carrying structure (12) fitted with a recess (18) for the radiation source, characterized in that it comprises:
- a cavity (17) provided in said recess (18) to carry the cooling fluid emerging on the side of the exposed space by one or several discharge outlets (80) capable of directing the fluid towards the median part of the exposed space, - a fin (58) shaped like a projecting rib extending on the side of the rear surface (56) of each reflector (34) while forming simultaneously a cooling surface, and a means for increasing the inertial moment of the profile of said reflector, - and a hook-shaped rim (59) at each end of said fin (58) to let through means for fixing (55) the reflectors (34) to positioning flanges (44).
.cndot. an electromagnetic radiation source comprising :
.cndot. a radiation emitter (32), .cndot. at least two lateral reflectors (34) situated at a ceriain distance from of the emitter (32) on either side thereof, and comprising each a reflecting front surface (52) opposite the emitter (32), and a rear surface (56), the emitter (32) and the reflectors (34) being laid out in order to direct the radiation towards an exposed space having a median part, both reflectors (34) being isolated from one another by a slot (66), .cndot. means for cooling the reflectors (34) enabling a cooling fluid to flow on the side of the rear surface (56) of the reflectors on the one hand, and through the slot (66) on the side of the front surface (52) of the reflectors on the other hand, .cndot. and a carrying structure (12) fitted with a recess (18) for the radiation source, characterized in that it comprises:
- a cavity (17) provided in said recess (18) to carry the cooling fluid emerging on the side of the exposed space by one or several discharge outlets (80) capable of directing the fluid towards the median part of the exposed space, - a fin (58) shaped like a projecting rib extending on the side of the rear surface (56) of each reflector (34) while forming simultaneously a cooling surface, and a means for increasing the inertial moment of the profile of said reflector, - and a hook-shaped rim (59) at each end of said fin (58) to let through means for fixing (55) the reflectors (34) to positioning flanges (44).
2. An irradiating device according to claim 1, characterized in that the rear surface (56) of the reflectors (34) is fitted with a great numerous of cooling ribs (60), and a superficial coating having a calorific emissivity coefficient greater than that of the reflectors (34) in order to obtain a thermal exchange surface larger than the reflecting surface formed by the front surface (52) of the reflectors.
3. An irradiating device according to claim 1, characterized in that the cavity (17) is winding and exhibits substantially constant thickness.
4. An irradiating device according to claim 3, characterized in that the carrying structure (12) comprises a distributing conduit (16) of the cooling fluid laid out parallel to the slot (66) and in that the device (10) comprises at least one channel linking each winding cavity (17) to the conduit (16).
5. An irradiating device according to claim 4, characterized in that the conduit (16) is isolated from the cavity (17) by an intermediate wall (14) comprising one or several communication orifices (22) forming said channel of fluid linking the winding cavity (17) to the conduit (16).
6. An irradiating device according to claim 5, characterized in that the section of the discharge outlet(s) (80) is substantially smaller than the section of the communication orifice(s).
7. An irradiating device according to claim 5, characterized in that the intermediate wall (14) comprises at least one orifice (22) linking the conduit to the slot (66).
8. An irradiating device according to claim 1, characterized in that the rear surface (56) comprises at least one stop (62) bearing upon a complementary stop (26) of said structure (12), the resultant of the forces due to the pressure exerted by the fluid on the rear surface (56) of the reflector tending to increase the force exerted by the stop (62) on the other stop (26).
9. An irradiating device according to claim 1, characterized in that it comprises a nebulizer (98) projecting into the fluid a liquid in thin droplets.
10. An irradiating device according to claim 1, characterized in that the emitter (32) is water-cooled and the cooling fluid through the slot (66) is an anti-oxidizing inert gas, significantly nitrogen.
11. An irradiating device according to claim 1, characterized in that the electromagnetic radiation source forms a stand-alone sub-assembly that is electrically integral, which sub-assembly is mounted to slide and to rest along to two orthogonal axes in the aeraulic carrying structure (12) by means of spans (62) sliding on rests (26),and of rails (46) sliding on bosses (30).
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR99/11243 | 1999-09-06 | ||
| FR9911243A FR2798187B1 (en) | 1999-09-06 | 1999-09-06 | ELECTROMAGNETIC IRRADIATION DEVICE HAVING COOLING MEANS |
| PCT/FR2000/002457 WO2001018447A1 (en) | 1999-09-06 | 2000-09-06 | Electromagnetic irradiating device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2383813A1 true CA2383813A1 (en) | 2001-03-15 |
Family
ID=9549646
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002383813A Abandoned CA2383813A1 (en) | 1999-09-06 | 2000-09-06 | Electromagnetic irradiating device |
Country Status (6)
| Country | Link |
|---|---|
| EP (1) | EP1216383A1 (en) |
| CN (1) | CN1372626A (en) |
| AU (1) | AU7425300A (en) |
| CA (1) | CA2383813A1 (en) |
| FR (1) | FR2798187B1 (en) |
| WO (1) | WO2001018447A1 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1712833A1 (en) * | 2004-02-04 | 2006-10-18 | Nitto Denko Corporation | Lighting device and light irradiating device using it and production method for photoreaction product sheet using those devices |
| CN103397556A (en) * | 2013-07-31 | 2013-11-20 | 方小玲 | Paper baking wall |
| EP3168861A1 (en) * | 2015-11-13 | 2017-05-17 | IST METZ GmbH | Assembly for uv irradiation of objects |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2825190B1 (en) * | 2001-05-23 | 2003-08-15 | Lumpp & Consultants | ELECTROMAGNETIC RADIATION LAMP |
| FR2829879B1 (en) * | 2001-09-14 | 2003-12-26 | Christian Lumpp | DEVICE FOR ELECTRICALLY AND AERAULICALLY CONNECTING AN IRRADIATION DEVICE COMPRISING AN ELECTROMAGNETIC RADIATION LAMP |
| CN100543392C (en) * | 2006-12-29 | 2009-09-23 | 河南农业大学 | Microwave dryer |
| CH700039A1 (en) * | 2008-12-01 | 2010-06-15 | Uviterno Ag | Device for irradiating a substrate |
| CN102632700A (en) * | 2012-04-18 | 2012-08-15 | 广东新优威印刷装备科技有限公司 | Printer |
| CN107893981B (en) * | 2017-11-14 | 2019-10-25 | 北京卫星环境工程研究所 | Solar simulator air cooling system |
| IL289537A (en) * | 2021-12-31 | 2023-07-01 | Elchai Ben Shushan | Electromagnetic radiation emitting device |
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|---|---|---|---|---|
| US3268718A (en) * | 1963-05-09 | 1966-08-23 | Scm Corp | Light reflector assembly |
| US3819929A (en) * | 1973-06-08 | 1974-06-25 | Canrad Precision Ind Inc | Ultraviolet lamp housing |
| US4434562A (en) * | 1981-09-02 | 1984-03-06 | American Screen Printing Equipment Company | Curing apparatus and method |
| JPH07256190A (en) * | 1994-03-18 | 1995-10-09 | Toshiba Lighting & Technol Corp | Uv rays irradiation device |
| ES2152690T3 (en) | 1996-07-09 | 2001-02-01 | Lumpp & Consultants | EMISSOR / RECEIVER DEVICE OF ELECTROMAGNETIC RADIATIONS, APPLIANCE AND PROCEDURE USING SUCH DEVICE. |
| US5861633A (en) * | 1997-08-04 | 1999-01-19 | Con-Trol-Cure, Inc. | Irradiator apparatus |
| FR2773640B1 (en) | 1998-01-15 | 2003-05-23 | Christian Lumpp | TUBE, DEVICE AND METHOD FOR EMITTING ELECTROMAGNETIC RADIATION |
-
1999
- 1999-09-06 FR FR9911243A patent/FR2798187B1/en not_active Expired - Fee Related
-
2000
- 2000-09-06 AU AU74253/00A patent/AU7425300A/en not_active Abandoned
- 2000-09-06 WO PCT/FR2000/002457 patent/WO2001018447A1/en not_active Application Discontinuation
- 2000-09-06 CN CN00812526A patent/CN1372626A/en active Pending
- 2000-09-06 CA CA002383813A patent/CA2383813A1/en not_active Abandoned
- 2000-09-06 EP EP00962577A patent/EP1216383A1/en not_active Withdrawn
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1712833A1 (en) * | 2004-02-04 | 2006-10-18 | Nitto Denko Corporation | Lighting device and light irradiating device using it and production method for photoreaction product sheet using those devices |
| EP1712833A4 (en) * | 2004-02-04 | 2009-06-03 | Nitto Denko Corp | Lighting device and light irradiating device using it and production method for photoreaction product sheet using those devices |
| CN103397556A (en) * | 2013-07-31 | 2013-11-20 | 方小玲 | Paper baking wall |
| EP3168861A1 (en) * | 2015-11-13 | 2017-05-17 | IST METZ GmbH | Assembly for uv irradiation of objects |
Also Published As
| Publication number | Publication date |
|---|---|
| EP1216383A1 (en) | 2002-06-26 |
| CN1372626A (en) | 2002-10-02 |
| AU7425300A (en) | 2001-04-10 |
| WO2001018447A1 (en) | 2001-03-15 |
| FR2798187A1 (en) | 2001-03-09 |
| FR2798187B1 (en) | 2002-02-01 |
| WO2001018447A8 (en) | 2001-08-09 |
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