DE1440523A1 - High frequency furnace, especially for high frequency heating by means of ultra high frequency oscillations - Google Patents

Description

Patent attorney
Applicant: HV PHIUPS ¹ 6LOElLAMPEiFABRIEKEN

Registration VMBi H _# 7 »96O

lT # V, Philips ^f Glosila: -. i ^ enfabrieken, "Jind. hoven / \ Holland,

"High frequency ^{furnace, especially fax 1} liochfrenaenzerhil mit bels TJltrahochfreouen ^ HO * win -i; n - en."

The invention relates to a high frequency furnace, especially for high frequency heating by means of vibrations ultra-high frequencies, a.TJ · in the decimeter or Centimeter area, with a ^ oucliloaGenen hot space with an entry seif ± nun_. and an outlet opening to Carrying out a 1 \ rdertandes has passed, the di ^ e too conveying heated objects through the ileizraum, during the - ü'intrittsüi'fmms and the Austrittsöffhuag ' in the direction of the FördorDunJerj Duichfülirungskanäle are arranged 'that the conveyor belt outside. "en Heizxaumes enclose.

Sine difficulty with such Höchstfreouensöfen form emerging from the oven Jjtreustrahlungen because i'ie in the boiler room Ultrahochfrequenzsclwingungen occur can through the inlet and Austrittsöffnunsen and connected through channels · pass to reduce these rjtreubtralilungen it is known, the length of this Durchfühiungskanüle ^ ^- Ioich a quarter-wave length or, an odd number of a quarter-wave length, of the ultra-high frequency;

9894 BATH ORIGINAL

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809809/0685

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The purpose of the refining is to develop a different one. ; High-frequency phones from the raised iyp to create at "the the scattered radiation emitted from the furnace is practically possible. table are completely suppressed, while.aui.sex'dem im Heizramn. a more regular hit is obtained.

The device according to: the invention is characterized by aaay. in ru, eliüäsßigen Abütänaen along the conveyor belt in a direction transverse to 'äiesei! Conveyor belt several Ab ^f; ichtun ^; s limbs ... made of conductive hat erial firmly attached to the. Passage through the ducts. Together with. r'en inner walls of these ducts an electrical. Sealing for -dia Itoeiifrec; uenisschv / in-3un ₀ en form, ^ yobei the Üün; .e of the Eurchi'-ihrun ^ sc canals at least equal to the / 40; en £ -; eiti.reij distance of these sealing members is,

-The Erfinrnir; and their Yorteilc will be on hand below the drawing ^; nearer 'erlivuterto ■

T'ig.'T ZOX-t siiien Kochfrea ^ ueazofen -aeh of the invention » ^:

iigo 2 «ei t a ..cLnijt only one i'eil of the Hoclifrsvuenzofons ,. V7ehrehd

H ¹ Xg. 3 ainen cut vlui'Ch eira a rope of a modified one

let _{;, t o} "■■ .-.

'The / in'-ELg. 1 oar ^ e ^ Otillte Hocu.'freci.uenzb.fen according to the. ürfindun · snthi'lt a.- ^ eiZretim 1, the over a '.Hohllexifereyatem 2 'ulurahociii'i-ei-uenzschwin ^ un ^ n be fed

<o those of an ultra-high-

> ^ freauenzgenei'ator, z _a B _o an iia ^ nö-brongenerator, originate. ⁰ ^ 'The boiler room T has a rectangular outlet opening ' 5 _r «Ρ -a rectangular opening opening Φ and" these openings ..; " ο connected recLteckige Durchxührungskan: ile 5 and 9 on '- .. ^m -said durcli l'uxchfaarui-askänäle ^ ^5; 9, a; ifürdorbönd; "S-hindurcage, that the objects to be heated would be: conveyed through the closed boiler room" g _A n nmr '

Around the scattered radiation exiting through the routing channels 5 »9 to suppress effectively, are at regular intervals along the conveyor belt 6 transversely to its longitudinal direction several sealing members 7 made of conductive material, e.g. Copper or brass, firmly arranged that "when passing through the ducts 5 »9 together with the inner walls of these ducts 5, 9 form an electrical seal for the ultra-high frequency oscillations form, the length of the ducts 5p 9 at least equal to the mutual spacing of these Sealing members 7 is © Here the sealing members 7 can e.g. be attached, the z «, B · made of fiberglass or some other Ordered material with a low loss factor

In the embodiment shown, the sealing members consist of metal plates of rectangular shape, the ends of the sealing members 7 facing the inner wall of the ducts 5 or 9 to achieve a firm capacitive coupling between these sealing members 7 and the ducts 5 or 9 in a direction parallel to the inner wall of these ducts 5 or _e are bent 9, so that in cross-section, this seal members considered an I- or have U-shaped profile »practically behave -sieh these sealing members 7 for the ultra-high frequency oscillations as a metallic closures, so that the emerging from the high-frequency furnace scattered radiation is virtually completely suppressed *

Pig * 2 shows a cross section through the high-frequency furnace shown in Pig * 1, in which sealing members 7 the objects 8 to be heated are attached with an I-shaped profile «

In this apparatus, the conveyor belt 6 passes through the heating chamber, so always yields an effective sealing of the through-channels 5 or _o 9, because the fact that the length of the through-channels 5 or "9, at least equal to the

809809/0685 " ⁴ ~

The distance between two abduction members 7 is for this made sure that there is always at least one of these members 7 are located in the ducts 5 "or 9, so that an effective seal of the Durehf ührungskanäle 5 or 9 is guaranteed

At the same time as the effective sealing of the rotary guide: channels 5 and 9, the sealing members 7 moving with the conveyor belt 6 in the heating room 1 ensure that no stationary vertical distribution can be set up in the heating room 1, so that with With the help of these sealing members 7 in the boiler room a more uniform field distribution is obtained without the need for special means, such as slowly rotating metal wings or rotating dipoles for supplying the ultra-high frequency oscillations to the boiler room Heizräum 1 through a stationary standing leldverteilung, and this effect can be optionally be further increased by the fact that on the conveyor belt at regular intervals further means ^ ZOB ₀ metal plates, rods or the like are mounted, the further im- uniformity of Peldverteilung senio

In this way, using the particularly simple Measures according to the invention not only provide an effective seal against stray radiation, but also a more uniform one Heating achieved

In the training of frequency furnaces according to the invention when calculating the & should the be considered objects to be heated räße} if these objects z .8 _e B © are large ", the distance between the successive sealing elements 7 must also be large and, accordingly, the length of the Durohführungkanäle 5 or «9» as shown in cross section in i «ig> 3» / _; "

80 980 9 / 068S

File Ä claims

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Claims (1)

Claim High-frequency furnace, in particular for high-frequency heating by means of. High-frequency vibrations, which is provided with a closed heating room with an inlet opening and an outlet opening for the passage of a conveyor belt that conveys the objects to be heated through the heating room, while at the inlet opening and the outlet opening in sight of the conveyor belt through channels are attached, which the conveyor belt outside of the Enclosing the heating room, characterized »that at regular intervals along the conveyor belt in a direction transverse to this belt several sealing members made of conductive material are fixedly arranged, which form an electrical seal for the high-frequency vibrations when passing through the ducts - together with the inner walls of these ducts, while the length of the implementation of the ducts is at least equal to the mutual spacing of these sealing members © 2nd high frequency furnace according to claim 1, characterized in that that the ends of the sealing members facing the ducts in a direction parallel to the inner wall of the latter Channels are bent at right angles * 3 · High-frequency furnace according to claim 1 or 2, characterized in that further means, e.g. Metal plates or metal rods are attached, which influence the field distribution in the boiler room. BATH ORIGINAL 809809/0685