DK174503B1

DK174503B1 - Cabin for drying painted objects, particularly of wood, involves drying by infrared radiation emitted by flameless heat panels fitted on opposite side walls of cabin, combined with layer of unheated air

Info

Publication number: DK174503B1
Application number: DK200101072A
Authority: DK
Inventors: Niels Erik B Joergensen
Original assignee: Niels Erik B Joergensen
Priority date: 2001-07-07
Filing date: 2001-07-07
Publication date: 2003-04-28
Also published as: DK200101072A

Abstract

The cabin for drying painted objects (0), particularly of wood, involves drying by infrared radiation emitted by flameless heat panels (6) fitted on opposite side walls (3,4) of the cabin, combined with a layer of unheated air. Along the side walls and the ceiling (2) of the cabin mirroring panels (11) are fitted between the heat panels, which can reflect the heat radiations.

Description

DK 174503 B1 -1-DK 174503 B1 -1-

Den foreliggende opfindelse omhandler en tørrekabine eller tørreboks af den i indledningen til krav 1 omhandlede art.The present invention relates to a drying booth or drying box of the kind referred to in the preamble of claim 1.

I kendte tørrekabiner foregår tørringen ved hjælp af opvarmet luft.In known drying cabins, drying is carried out by means of heated air.

5 Det er en ulempe ved disse kendte tørrekabiner, at nogle flader tørrer hurtigere end andre. Da indblæsningen af varmluft skal fortsætte til alle flader er tørre, sker der ved disse kendte tørrekabiner et stort energitab. Endvidere er tørringen ved hjælp af varmluft mangelfuld, idet det er det øverste lag af lakken, der tørrer først, hvorved der dannes en hinde på overfladen aftørret lak, medens underliggende lak ikke 10 bliver tørret. Lakken kan koge op i bobler, så overfladen bliver ujævn.5 It is a disadvantage of these known drying booths that some surfaces dry faster than others. As the supply of hot air must continue until all surfaces are dry, a large energy loss occurs in these known drying cabins. Further, the drying by hot air is defective, being the top layer of the lacquer which dries first, thereby forming a membrane on the surface dried lacquer while the underlying lacquer is not dried. The varnish can boil in bubbles, leaving the surface uneven.

Fra WO 87/01186 A1 kendes en tørrekabine, hvor tørringen sker ved en kombination af opvarmet luft og infrarød stråling. I denne kabine frembringes den infrarøde stråling af elektriske IR strålerør, der er monteret i reflektorer, hvorved der dannes et strålebundt. Det er en ulempe ved disse strålerør, at de er meget energi-15 krævende og derfor er kostbare i drift, og at den udsendte stråling ikke absorberes optimalt i lak og andre væsker. For at bestråle et emne, der skal behandles, fra alle sider er det nødvendigt at omgive emnet hele vejen rundt med strålerør og reflektorer. Tørrekabinen bliver derfor kompliceret i sin opbygning og er derfor dyr at fremstille. Endvidere er den vanskelig at indstille.From WO 87/01186 A1 a drying cabin is known, where the drying is done by a combination of heated air and infrared radiation. In this cabin, the infrared radiation is generated by electric IR radiation tubes mounted in reflectors, thereby forming a beam of radiation. It is a disadvantage of these radiation pipes that they are very energy-demanding and therefore expensive to operate, and that the emitted radiation is not optimally absorbed in lacquer and other liquids. In order to irradiate a subject to be treated from all sides, it is necessary to surround the subject all the way around with radiation pipes and reflectors. The drying cabin is therefore complicated in its construction and therefore expensive to manufacture. Furthermore, it is difficult to set.

20 Det er et formål med den foreliggende opfindelse at anvise en tørrekabine, der ikke har ulemperne ved de kendte tørrekabiner.It is an object of the present invention to provide a drying cabin which does not have the disadvantages of the known drying cabins.

Dette opnås ved at udforme tørrekabinen som angivet i den kendetegnende del af krav 1. Herved opnås, at energiforbruget til frembringelse af infrarød stråling alt andet lige kun er 1/20 af energiforbruget i den kendte kabine, hvor der anvendes 25 strålerør. Da endvidere absorbsionsevnen af den udsendte stråling, der har en -2- DK 174503 B1 bølgelængde på 4-7 Micron, er væsentligt større end strålingen fra strålerør, opnås der en hurtigere tørring. Der kan derfor anvendes uopvarmet luft, hvorved der opnås en yderligere energibesparelse. Tørrekabinen er enkel i sin udformning og derfor S billig at fremstille. Da der kun er få stråleenheder, og da de kan indstilles uafhængigt af spejlende flader, er den indvidere nem at indstille.This is achieved by designing the drying cabin as set forth in the characterizing part of claim 1. Hereby, it is achieved that the energy consumption for producing infrared radiation is otherwise only 1/20 of the energy consumption in the known cabin, where 25 radiation pipes are used. Furthermore, since the absorbance of the emitted radiation having a wavelength of 4-7 Micron is significantly greater than the radiation from the radiation tube, a faster drying is achieved. Therefore, unheated air can be used, thereby providing an additional energy saving. The drying cabin is simple in its design and therefore S cheap to manufacture. Since there are only a few beam units and can be set independently of mirrored surfaces, it is easy to adjust.

Krav 2 omhandler en foretrukken placering af varemepanelerne i en tørrekabine ifølge opfindelsen.Claim 2 relates to a preferred location of the item panels in a drying cabin according to the invention.

Krav 3 omhandler en foretrukken udformning af de spejlende flader til en 10 tørrekabine ifølge opfindelsen.Claim 3 relates to a preferred embodiment of the mirrored surfaces of a drying cabin according to the invention.

Ved det i krav 4 omhandlede opnås, at varmestrålemes retning kan varieres.The object of claim 4 provides that the direction of the heat rays can be varied.

Ved det i krav 5 omhandlede opnås, at friskluft suges op over emneme, der skal tørres.The process of claim 5 provides that fresh air is sucked up over the blanks to be dried.

Krav 6 omhandler en foretrukken overfladetemperatur af varmepanelerne i en 15 tørrekabine ifølge opfindelsen.Claim 6 relates to a preferred surface temperature of the heating panels of a drying cabin according to the invention.

Opfindelsen skal forklares nærmere i det følgende under henvisning til tegningen, på hvilken fig. 1 viser en tørrekabine ifølge opfindelsen, set ovenfra, fig. 2 viser tørrekabinen, set i retning af pilene l-l i fig. 1, 20 fig. 3 viser i større målestok et snit efter linien Il-Il i fig. 1, og fig. 4 viser i perspektiv et delvist snit gennem et varmepanel til en tørrekabine ifølge opfindelsen.The invention will be explained in more detail below with reference to the drawing, in which: FIG. 1 is a top view of a drying cabin according to the invention; FIG. 2 shows the drying cabin, seen in the direction of arrows 1 to 1 in FIG. 1, 20 FIG. 3 shows, on a larger scale, a section along the line Il-Il in fig. 1, and FIG. 4 is a perspective view of a partial section through a heating panel for a drying cabin according to the invention.

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Som vist på tegningen har en tørrekabine til tørring af lakerede emner en bund 1, et loft 2 og to sidevægge 3 og 4. Ved den ene eller ved begge ender har tørre-kabinen oplukkelige døre S. Ydervæggene og dørene er isolerede. Tørrekabinen 5 kan Have en bredde på 2,0 m, en højde på 2,2 m og en længde på 3,0 m.As shown in the drawing, a drying cabin for drying lacquered workpieces has a bottom 1, a ceiling 2 and two side walls 3 and 4. At one or both ends the drying cabin has openable doors S. The outer walls and doors are insulated. The drying cabin 5 can have a width of 2.0 m, a height of 2.2 m and a length of 3.0 m.

Ifølge opfindelsen frembringes tørringen ved hjælp af infrarøde stråler, der udsendes fra flammeløse varmepaneler 6 kombineret med et luftskifte af ikke opvarmet luft.According to the invention, the drying is produced by infrared rays emitted from flameless heating panels 6 combined with an air exchange of unheated air.

Der findes forskellige typer af flammeløse varmepaneler, der udsender en infrarød 10 stråling, f.eks. elektrisk infrarøde lamper med glødetråd, elektrisk/keramiske infrarøde armaturer og gasopvarmede varmepaneler, hvor varmeudviklingen sker ved katalysation mellem ilt og gas.There are various types of flameless heat panels that emit an infrared radiation, e.g. electric infrared lamps with filament, electric / ceramic infrared luminaires and gas-heated heating panels, where the heat generation occurs through oxygen-gas catalysis.

Et gasopvarmet varmepanel af sidtsnævnte type er vist på fig. 4. Som vist er varmepanelet 6 afgrænset af en kasse 7, der på den varmeafjgivende side er 15 udformet som et trådnet Under trådnettet er der et katalytisk tæppe 8, og under tæppet er der isoleringsmåtter 9 og 10. Mellem tæppet 8 og måtten 9 er der placeret et elektrisk varmelegeme, der kan opvarme det katalytiske tæppe til en temperatur på 120° C. Så snart, denne temperatur er nået, tilføres der gas gennem en ledning. Gassen fordeles i det katalytiske tæppe og samtidig siver der luft ind gennem 20 trådnettet på forsiden af varmepanelet. Når luft og gas blandes i det katalytiske tæppe, sker der en flammeiøs forbrænding, hvorved der udsendes en infrarød stråling. Gasmængden kan indstilles, så der opnås en ønsket overfladetemperatur, der typisk ligger i området 140° C - 600° C. Infrarøde stråler er elektromagnetiske bølger, der bevæger sig i rette linier og bliver absorberet og reflekteret og kan 25 samles og spredes som synligt lys.A gas-fired heating panel of the latter type is shown in FIG. 4. As shown, the heating panel 6 is bounded by a box 7 formed on the heat-emitting side 15 as a wire mesh. Below the wire mesh there is a catalytic rug 8, and under the blanket there are insulation mats 9 and 10. Between the rug 8 and the mat 9 is placed an electric heater capable of heating the catalytic blanket to a temperature of 120 ° C. As soon as this temperature is reached, gas is supplied through a conduit. The gas is distributed in the catalytic blanket and at the same time air seeps in through the wire mesh on the front of the heating panel. When air and gas are mixed in the catalytic blanket, a flame-free combustion takes place, thereby emitting an infrared radiation. The amount of gas can be adjusted to achieve a desired surface temperature, typically in the range of 140 ° C - 600 ° C. Infrared rays are electromagnetic waves that move in straight lines and are absorbed and reflected and can be collected and scattered as visible light. .

Varmepaneleme 6 er fortrinsvis monteret på modstående sidevægge 3 og 4 i tørrekabinen, og i tørrekabinen er der langs sidevæggene 3 og 4 mellem varmepaneleme 6 og langs loftet 2 monteret spejlende flader 11.The heating panels 6 are preferably mounted on opposite side walls 3 and 4 of the drying cabin, and in the drying cabin there are mirrored surfaces 11 mounted along the side walls 3 and 4 between the heating panels 6 and along the ceiling 2.

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Som vist kan et varmepanei 6 eller række af varmepaneler være anbragt forneden, nær bunden 1, på den ene sidevasg 3 og foroven, nær loftet 2, på den anden sidevæg 4.As shown, a heating panel 6 or row of heating panels may be located below, near the bottom 1, on one side wall 3 and above, near the ceiling 2, on the other side wall 4.

5 De spejlende flader 11 kan som vist have savtakform eller være opbygget af enkelte, plane spejlflader, der er monteret i savtakform, hvor bølgetoppene 12 og bølgedalene 13 er rette linier, der er orienteret vandret i kabinens længderetning.The mirrored surfaces 11 may, as shown, be of sawdust form or be constructed of single, flat mirror surfaces mounted in sawdust form, with the wave peaks 12 and the wave valleys 13 being straight lines oriented horizontally in the longitudinal direction of the cabin.

Dersom de spejlende flader er opbygget af enkelte flader, kan disse være indstillelige. De kan f.eks. være svingeligt monteret på tappe 14. Varmepanelerne 6 10 kan også være indstillelige, f.eks. være svingeligt monteret på tappe 15.If the mirrored surfaces are made up of individual surfaces, these can be adjustable. For example, they can may be pivotally mounted on pin 14. The heating panels 6 10 may also be adjustable, e.g. be pivotally mounted on pin 15.

En del af de udsendte varmestråler rammer direkte det eller de emner o, der skal tørres. Andre stråler reflekteres mellem de spejlende flader 11 på modstående sidevægge 3 og 4 og i loftet 2 et antal gange, hvorefter de rammer emnet o, der således bliver bestrålet fra alle sider, hvorved der opnås en tilsvarende hurtig 15 tørring.Some of the emitted heat rays directly hit the item (s) to be dried. Other rays are reflected between the mirrored surfaces 11 on opposite side walls 3 and 4 and in the ceiling 2 a number of times, after which they hit the blank o, which is thus irradiated from all sides, thereby obtaining a correspondingly rapid drying.

Tørrekabinen er udformet med et ventilationsanlæg, der kan bestå af en udsugningsventilator 16, der suger luft ud aftørrekaninen gennem en udsugningskanal 17, der kan være tilsluttet til kabinen i loftet 2. Under tilslutningen til udsugningskanalen kan der i tørrekabinen være monteret en skærm 18, der afbøjer 20 luftstrømmen.The drying cabin is provided with a ventilation system which may consist of a suction fan 16 which draws air out of the drying rabbit through a suction duct 17 which can be connected to the cabin in the ceiling 2. During the connection to the suction duct, a screen 18 may be mounted which deflects the 20 airflow.

Luftmængden kan være indstillelig, og luftmængde, overfladetemperatur af varmepanelerne og eventuel indstilling af spejlene kan foregå fra en kontrol- eller styreboks 25. Tørrekabinen kan enten være indrettet, så emneme, der skal tørres, transporteres gennem tørrekabinen, eksempelvis på en hængebane, eller er 25 stationære i tørrekabinen under tørreprocessen.The amount of air can be adjustable and the amount of air, the surface temperature of the heating panels and any setting of the mirrors can be from a control or control box 25. The drying cabin can either be arranged so that the items to be dried are transported through the drying cabin, for example on a hanging path, or are 25 stationary in the dryer during the drying process.

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En del af den udsugede luft ledes til det frie gennem en kanal 19. Den resterende luftmængde recirkuleres gennem kanaler 20 og 21 til fordelerrør, henholdsvis 22 og i 23, hvorfra luften ledes ind i tørrekabinen under varmepaneleme 6. Friskluft ledes 5 ind i tørrekabinen ved bunden af dørene 5, eksempelvis gennem åbninger 24.A portion of the extracted air is conducted to the open air through a duct 19. The remaining amount of air is recirculated through ducts 20 and 21 to distributor pipes 22 and 23 respectively, from which the air is fed into the drying cabin under the heating panels 6. Fresh air is fed into the drying cabin at the bottom of the doors 5, for example through openings 24.

Den viste og beskreven tørrekabine skal kun tjene til at anskueliggøre opfindelsen.The drying cabin shown and described is only intended to illustrate the invention.

Der kan inden for opfindelsens rammer tænkes forskellige modifikationer.Various modifications may be envisaged within the scope of the invention.

Ekempelvis kan de spejlende flader have anden form end savtakform.For example, the mirrored surfaces may have a shape other than sawtooth shape.

Claims

1. Drying booth or drying box for drying varnished items (o), for example, of wood composed of several parts or having multiple surfaces to be treated simultaneously, which drying cabin consists of a bottom (1), a ceiling ( 2), side walls (3,4), and at least at one end wall have openable doors (5), and the drying is done either by blowing in air or by a combination of infrared radiation and blowing in air, characterized in that The drying is produced by infrared rays emitted from flameless, gas-heated heating panels (6), which are preferably mounted on opposite side walls (3) and (4), combined with an air exchange of non-heated air, and that at least in the drying cabin along the side walls (3) and (4) between the heating panels (6) and along the ceiling (2) are mounted mirror surfaces (11) which can reflect the heat rays.

Drying cabin according to claim 1, characterized in that at least two heating panels (6) or a series of heating panels below, near the bottom (1), are arranged on one side wall (3) at two opposite side walls (3,4). , and at least one heating panel (6) or row of heating panels at the top, near the ceiling (2), on the opposite side wall (4).

Drying cabin according to claim 1, characterized in that the mirror surfaces (11), viewed from the end, have or are located in sawtooth form, wherein the wave peaks (12) and the wave valleys (13) are straight lines oriented horizontally in the cabin's longitudinal direction.

Drying cabin according to claim 1, characterized in that the mirror surfaces and / or the sill surfaces are adjustable. DK 174503 B1 -7-

Drying cabin according to claim 1, characterized in that the extraction of air takes place at the ceiling (2) through a suction fan (16), that part 5 of the extracted air is recirculated and that the recirculated air is fed into the drying cabin under the heating panels (6). ) and the fresh air is sucked in at the bottom of the doors (5), e.g. through openings (24).

Drying cabin according to claim 1, characterized in that the surface temperature of the heating panels is 130 ° C - 300 ° C.

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