US3671704A - Apparatus for controlling the field intensity in material processed in a capacitive high frequency field - Google Patents

Apparatus for controlling the field intensity in material processed in a capacitive high frequency field Download PDF

Info

Publication number
US3671704A
US3671704A US17175A US3671704DA US3671704A US 3671704 A US3671704 A US 3671704A US 17175 A US17175 A US 17175A US 3671704D A US3671704D A US 3671704DA US 3671704 A US3671704 A US 3671704A
Authority
US
United States
Prior art keywords
auxiliary electrodes
furnace
electrode
processed
high potential
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US17175A
Other languages
English (en)
Inventor
Hans-Christian Grassmann
Emil Walther
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens AG
Siemens Corp
Original Assignee
Siemens Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from DE19691912929 external-priority patent/DE1912929C3/de
Application filed by Siemens Corp filed Critical Siemens Corp
Application granted granted Critical
Publication of US3671704A publication Critical patent/US3671704A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/46—Dielectric heating
    • H05B6/60—Arrangements for continuous movement of material

Definitions

  • the invention relates to the control of the field intensity in material being processed. More particularly, the invention relates to apparatus for controlling the field intensity in material being processed in a capacitive high frequency field. The material being processed is positioned between a high potential electrode and a grounded electrode.
  • the apparatus of our invention functions to adjust or control the field intensity in accordance with all the requirements relating thereto and is locally variable over the entire length of the furnace in which it is installed.
  • the apparatus of the invention utilizes known components which may be subsequently installed in existing high frequency furnace equipment and may be removed rapidly and with facility. Furthermore, the apparatus of the invention utilizes simple components which filllCIlOl'l reliably and economically.
  • the principal object of the invention is to provide new and improved apparatus for controlling the field intensity in material being processed in a capacitive high frequency field.
  • An object of the invention is to provide apparatus of simple structure for controlling the field intensity in material being processed in a capacitive high frequency field.
  • An object of the invention is to provide apparatus for controlling the field intensity in material being processed in a capacitive high frequency field with efficiency, effectiveness, reliability and economy.
  • apparatus for controlling the field intensity in material being processed in a capacitive high frequency field between a high potential electrode and a grounded electrode comprises auxiliary electrode means positioned between the material being processed and the high potential electrode.
  • the auxiliary electrode means comprises a plurality of auxiliary electrodes. Some of the auxiliary electrodes are at ground potential. Some of the auxiliary electrodes are insulated from the others.
  • a furnace houses the high potential electrode, the grounded electrode, the auxiliary electrodes and the material to be processed and has a longitudinal axis.
  • the auxiliary electrodes are rods positioned either transversely or parallel to the longitudinal axis of the furnace or are tubes positioned either transversely or parallel to the longitudinal axis of the furnace, or are plates.
  • the high potential electrode has a specific width and the auxiliary electrodes are positioned transversely to the longitudinal axis of the furnace and each of the auxiliary electrodes has a length which is greater than the width of the high potential electrode.
  • the auxiliary electrodes are parallel to each other.
  • the auxiliary electrodes are rods having circular crosssectional areas, or rods having elliptical cross-sectional areas, or plates having angular cross-sectional areas with rounded edges.
  • Each of the auxiliary electrodes is rotatable about one of its axes.
  • a mounting arrangement mounts the auxiliary electrodes in a manner whereby the distance between adjacent auxiliary electrodes is variable and the distance of the auxiliary electrodes from the grounded electrode is variable.
  • the high potential electrode and/or the auxiliary electrodes are heatable.
  • auxiliary electrodes are at ground potential if a reduced field intensity is desired at a specific locality. If, on the other hand, an increase in field intensity is desired in a specific locality, some of the auxiliary electrodes are insulated from the others.
  • Each of the auxiliary electrodes is rotatable about one of its axes, when the cross-sectional area of each auxiliary electrode is elliptical or of plate configuration, in order to provide a precise adjustment or control of the field intensity.
  • FIG. 1 is a schematic diagram of an embodiment of the apparatus of the invention
  • FIG. la is a graphical presentation of the field intensity versus the length of the furnace housing the apparatus of the invention, when said apparatus is not utilized;
  • FIG. lb is a graphical presentation of the field intensity versus the length of the furnace housing the apparatus of the invention, when the auxiliary electrodes of the invention are grounded;
  • FIG. 10 is a graphical presentation of the field intensity versus the length of the furnace housing the apparatus of the invention, when some of the auxiliary electrodes of the invention are grounded and at least one of the auxiliary electrodes is insulated;
  • FIG. 2 is a schematic end view of the embodiment of FIG. 1;
  • FIG. 3 is a schematic diagram of a mounting arrangement of the apparatus of the invention.
  • FIG. 4 is a schematic diagram of an elliptical cross-sectional area of an auxiliary electrode of the invention.
  • FIG. 5 is a perspective view of a plate-shaped embodiment of an auxiliary electrode of the invention.
  • the high frequency furnace of FIG. 1 comprises a high potential electrode 1 which is electrically connected to a high frequency generator 2.
  • a grounded transport belt 3 functions as the other electrode and moves the material to be processed through the high frequency field produced between itself and the high potential electrode 1.
  • the material to be processed comprises a plurality of spools, spindles, or spinning cakes 4a, 4b, 4c (FIG. 1), 4d, 4e (FIG. 2), and so on.
  • a corresponding insulating disc and a corresponding equipotential lid are provided in known manner.
  • the spool 4a has an insulating disc 5a on its top base, an insulating disc 5b on its bottom base, an equipotential lid 6a on its insulating disc 5a and an equipotential lid 6b on its insulating disc 5!).
  • the spool 4b has an insulating disc 50 on its top base, an insulating disc 5d on its bottom base, an equipotential lid 6c on its insulating disc 5c and an equipotential lid 6d on its insulating disc 5d.
  • the spool 40 has an insulating disc 5e on its top base, an insulating disc 5]" on its bottom base, an
  • the spool 4d has an insulating disc 5 on its top base, an insulating disc 5h on its bottom base, an equipotential lid 6w on its insulating disc 5g and an equipotential lid 6 x on its insulating disc 5h.
  • the spool 4e has an insulating disc 5i on its top base, an insulating disc Sj on its bottom base, an equipotential lid 6y on its insulating disc 5i and an equipotential lid 62, on its insulating disc 5j.
  • the spools, with their corresponding insulating discs and equipotential lids, are moved by the transport belt 3 through the high frequency field, in the direction of the arrow 7.
  • the furnace is shielded by, and enclosed in, a housing 8 in order to avoid sweep radiation.
  • the housing 8 has bilaterally open portions 9a and 9b of specific dimensions and design. If the furnace includes only the high potential electrode 1 and the transport belt electrode 3, and excludes the auxiliary electrodes of the invention, the field intensity has the characteristic illustrated in FIG. la. As shown in FIG. la, the field intensity reaches its maximum shortly after the start of the high frequency field. This produces an intensive heating of the material being processed, which intensive heating is frequently undesired, as hereinbefore indicated, since it may result in adverse conditions in the material being processed.
  • the abscissa represents the length L in meters and the ordinate represents the field intensity in Volts per centimeter.
  • a plurality of auxiliary electrodes 10, 11, I2 and 13 are positioned between the material to be processed and the high potential electrode 1 in order to control the field intensity.
  • the auxiliary electrodes 10, 11, 12 and 13 are positioned either in grounded or insulated relation and may be heated from within up to approximately 100 C. by an infrared radiator.
  • the auxiliary electrodes 10, 11, 12 and 13 are positioned in parallel relation with each other, so that they are the equivalent of the rungs of a ladder.
  • the auxiliary electrodes 10, 11, I2 and 13 are mounted or supported on a mounting arrangement comprising a support member 14.
  • the support member 14, and therefore the auxiliary electrodes 10, 11, 12 and 13 mounted thereon, may be moved in vertical directions due to the cooperation of adjusting screws and longitudinal bores 15 and 16 formed in the housing.
  • the auxiliary electrodes 10, 11, 12 and 13 may thus be moved, in accordance with operating requirements, to varying heights or levels h from the transport belt electrode 3.
  • FIG. 3 which is an end view, taken from the left-hand side of FIG. I, discloses another mounting arrangement for varying the distance between the auxiliary electrodes 10, ll, 12 and I3 and the transport belt electrode 3.
  • the mounting arrangement of FIG. 3 comprises a pair of angular supports 17 and 18 which are spaced from each other and each of which has a cooperating adjusting screw provided therein.
  • the angular support 17 thus has an adjusting screw cooperating therewith and the angular support 18 has an adjusting screw 19 cooperating therewith.
  • Each of the adjusting screws 19 and 20 extends through its corresponding angular structure and a longitudinal bore formed through a corresponding one of a pair of cover plates 21 and 22.
  • the cover plates 21 and 22 are joined by a support member 23 which extends horizontally between them.
  • the support member 23 has notches 24 formed in its upper surface.
  • the auxiliary electrodes 10, ll, 12 and 13 rest in any desired one of the notches 24 of the structural member 23. In this manner, the distances a, b and c (FIG. 3) between adjacent ones of the auxiliary electrodes 10, ll, 12 and 13 may be varied as desired, as well as the height h of said auxiliary electrodes from the transport belt electrode 3.
  • All the auxiliary electrodes 10, 11, 12 and 13 are grounded in order to provide the field intensity characteristic of FIG. lb.
  • the initial field intensity is considerably lower than the initial field intensity of the characteristic of FIG. la.
  • the field intensity characteristic of FIG. 10 is provided.
  • the auxiliary electrode 11 is mounted in electrical insulation from the other auxiliary electrodes and causes the increase in the field intensity.
  • any desired field intensity characteristic may be provided by an appropriate arrangement of the auxiliary electrodes 10, 11, 12 and 13.
  • an alternate arrangement of grounded and insulated auxiliary electrodes will produce a sawtooth field intensity characteristic, and a pulse type field will act upon the material being processed.
  • Each of the auxiliary electrodes 10, ll, 12 and 13 may comprise a solid copper rod or a hollow copper tube or pipe. If the auxiliary electrodes are copper tubes, the heating elements which heat the auxiliary electrodes may be positioned in the interior of said tubes. If the auxiliary electrodes are copper rods, they have to be heated by outside radiation. If necessary, the auxiliary electrodes 10, 11, 12 and 13 may also be coated with a layer of electrical insulation. such as, for example, a varnish or plastic.
  • FIG. 4 is a cross-sectional view of an auxiliary electrode having an elliptical cross-sectional area.
  • the auxiliary electrode of FIG. 4 is of hollow tubular configuration and may be rotated about either axis of the ellipse.
  • the broken lines in FIG. 4 illustrate the rotation of the auxiliary electrode about one of its axes 25.
  • the rotation of the auxiliary electrode about one of its axes permits a precision adjustment of the field intensity.
  • FIG. 5 illustrates an auxiliary electrode having the configuration of a plate.
  • the auxiliary electrode of FIG. 5 may be rotated about its axis 26 or the other of its axes perpendicular to said axis.
  • the cross-sectional area of the auxiliary electrode of FIG. 5 is rectangular and the edges are rounded off, to eliminate any point effect.
  • the auxiliary electrodes 10, ll, 12 and 13 are nonnally positioned transversely to the longitudinal axis 28 (FIG. 1) of the furnace. As shown in FIG. 2, each of the auxiliary electrodes has a length which is greater than the width of the high potential electrode 1. In other words, each of the auxiliary electrodes 10, 11, 12 and 13 extends beyond the high potential electrode 1 at both ends thereof. This results in the catching of most of the stray field.
  • the auxiliary electrodes 10, 11, 12 and 13 may also be positioned parallel to the longitudinal axis 28 of the furnace, or at an acute angle therewith. The length of each of the auxiliary electrodes may then be less than the width of the high potential electrode.
  • our invention is not limited to the examples illustrated, but may be utilized in many different arrangements. It is possible, in accordance with our invention, to automatically adjust the auxiliary electrodes in accordance with a predetermined field intensity curve, that is, in accordance with a predetermined program.
  • the apparatus of our invention is not limited to processing spools, spindles or spinning cakes, but may be utilized in any circumstances in which a sudden vapor development or sudden overheating is to be avoided. Such developments occur, for example, during the drying of casting cores, and in high frequency drying systems for sugar and the like.
  • a capacitive high frequency continuous heating furnace for processing material passing through the furnace along a travel path on a transport belt between a high potential electrode and a grounded electrode, said furnace comprising auxiliary electrodes between the high potential electrode and the material to be processed for adjusting the field intensity between the high potential electrode and the grounded electrode along the travel path of the material to be processed, and means for applying to said auxiliary electrodes a potential which deviates from the potential of the high potential electrode.
  • a furnace as claimed in claim 1 wherein the furnace houses said high potential electrode, said grounded electrode, said auxiliary electrodes and said material to be processed and has a longitudinal axis, and wherein said auxiliary electrodes are tubes positioned transversely to the longitudinal axis of said furnace.
  • a furnace as claimed in claim 1 wherein the furnace houses said high potential electrode, said grounded electrode, said auxiliary electrodes and said material to be processed and has a longitudinal axis, and wherein said auxiliary electrodes are plates positioned transversely to the longitudinal axis of said furnace.
  • the furnace houses said high potential electrode, said grounded electrode, said auxiliary electrodes and said material to be processed and has a longitudinal axis, and wherein said high potential electrode has a specific width and said auxiliary electrodes are positioned transversely to the longitudinal axis of said furnace and each of said auxiliary electrodes has a length which is greater than the width of said high potential electrode.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Physical Or Chemical Processes And Apparatus (AREA)
  • Drying Of Solid Materials (AREA)
  • Furnace Details (AREA)
  • Control Of High-Frequency Heating Circuits (AREA)
  • Constitution Of High-Frequency Heating (AREA)
US17175A 1969-03-14 1970-03-06 Apparatus for controlling the field intensity in material processed in a capacitive high frequency field Expired - Lifetime US3671704A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19691912929 DE1912929C3 (de) 1969-03-14 Anordnung zur Beeinflussung der Feldstärke im Behandlungsgut, z.B. in Spinnkuchen

Publications (1)

Publication Number Publication Date
US3671704A true US3671704A (en) 1972-06-20

Family

ID=5728088

Family Applications (1)

Application Number Title Priority Date Filing Date
US17175A Expired - Lifetime US3671704A (en) 1969-03-14 1970-03-06 Apparatus for controlling the field intensity in material processed in a capacitive high frequency field

Country Status (7)

Country Link
US (1) US3671704A (de)
JP (1) JPS4842897B1 (de)
AT (1) AT299402B (de)
CH (1) CH514970A (de)
FR (1) FR2038938A5 (de)
GB (1) GB1293021A (de)
NL (1) NL7002439A (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20170266986A1 (en) * 2016-03-16 2017-09-21 Masafumi Yamada Drying device and liquid discharging device

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS54128796U (de) * 1978-02-27 1979-09-07

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2479351A (en) * 1945-08-10 1949-08-16 Westinghouse Electric Corp High-frequency dielectric heating apparatus
US2504956A (en) * 1946-05-31 1950-04-25 Girdler Corp Combined heating electrodes and variable capacitor for dielectric heating
US2737569A (en) * 1951-08-02 1956-03-06 Skenandoa Rayon Corp Electrode structure for high frequency drier
US3329796A (en) * 1966-07-28 1967-07-04 Radio Frequency Company Inc Radio frequency apparatus
US3404462A (en) * 1966-08-09 1968-10-08 Standard Register Co Dielectric heat apparatus

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2479351A (en) * 1945-08-10 1949-08-16 Westinghouse Electric Corp High-frequency dielectric heating apparatus
US2504956A (en) * 1946-05-31 1950-04-25 Girdler Corp Combined heating electrodes and variable capacitor for dielectric heating
US2737569A (en) * 1951-08-02 1956-03-06 Skenandoa Rayon Corp Electrode structure for high frequency drier
US3329796A (en) * 1966-07-28 1967-07-04 Radio Frequency Company Inc Radio frequency apparatus
US3404462A (en) * 1966-08-09 1968-10-08 Standard Register Co Dielectric heat apparatus

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20170266986A1 (en) * 2016-03-16 2017-09-21 Masafumi Yamada Drying device and liquid discharging device
US10232641B2 (en) * 2016-03-16 2019-03-19 Ricoh Company, Ltd. Drying device and liquid discharging device

Also Published As

Publication number Publication date
DE1912929A1 (de) 1970-09-24
AT299402B (de) 1972-06-26
CH514970A (de) 1971-10-31
NL7002439A (de) 1970-09-16
JPS4842897B1 (de) 1973-12-15
DE1912929B2 (de) 1975-09-04
FR2038938A5 (de) 1971-01-08
GB1293021A (en) 1972-10-18

Similar Documents

Publication Publication Date Title
US2428615A (en) Method and apparatus for drying yarn packages in an electrostatic field
US3471682A (en) Radiant heating apparatus
US4746968A (en) Combined microwave and thermal drying apparatus
US3701875A (en) H. f. heating apparatus
US3263052A (en) Power distribution system for microwave process chambers
US2473251A (en) High-frequency dielectric heating apparatus
EP0543935B1 (de) Teilchen-strahl-generator
US2445443A (en) Means for drying extended lengths of thread with infrared lamps
US2492187A (en) Method and apparatus for electrical heating
US3329796A (en) Radio frequency apparatus
US2838639A (en) Film resistor spirallising
US3671704A (en) Apparatus for controlling the field intensity in material processed in a capacitive high frequency field
GB2189015A (en) Radio frequency nozzle bar dryer
US20240082444A1 (en) System and Method for Ultra-Close Proximity Irradiation of Rotating Biomass
US2503779A (en) Device for radio frequency treatment of filamentary material
DE3004710A1 (de) Verfahren zum aufwachsen einer epitaktischen schicht auf einem scheibchen in einem reaktionsgefaess fuer gasphasenabscheidung
JPH092432A (ja) 缶体被覆を３６０゜硬化させるための誘導加熱機構
US2405037A (en) High-frequency heating apparatus
US2530680A (en) Apparatus for treating twisted filamentary materials
DE2742086A1 (de) Vorrichtung zum trocknen der schlichte von glasseidefaeden o.dgl.
US2737569A (en) Electrode structure for high frequency drier
US2586328A (en) Dielectric heating especially for spools of rayon thread
US5175406A (en) Resonant high-frequency or micro-wave applicator for thermal treatment of continuously moving flat material
US3357108A (en) Mobile dielectric drying apparatus with energy source coupling means
US3218430A (en) Device for preparing a melt from high polymers