US2824940A - High-frequency heating device - Google Patents

High-frequency heating device Download PDF

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Publication number
US2824940A
US2824940A US443586A US44358654A US2824940A US 2824940 A US2824940 A US 2824940A US 443586 A US443586 A US 443586A US 44358654 A US44358654 A US 44358654A US 2824940 A US2824940 A US 2824940A
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US
United States
Prior art keywords
space
electrodes
work piece
frequency
gauge
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
US443586A
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English (en)
Inventor
Kuhlmann Walter
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.)
NORTH AMERICAN PHILPS Co
NORTH AMERICAN PHILPS COMPANY Inc
Original Assignee
NORTH AMERICAN PHILPS Co
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
Application filed by NORTH AMERICAN PHILPS Co filed Critical NORTH AMERICAN PHILPS Co
Application granted granted Critical
Publication of US2824940A publication Critical patent/US2824940A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • H05B6/62—Apparatus for specific applications

Definitions

  • the present invention relates to high-frequency heating. More particularly, the invention relates to a screened space for capacitative high-frequency heating of workpieces, for example for gluing plywood sheets, bodies of different layers of wood of curved form and the like. It is known that such work pieces are subjected to highfrequency heating in a screened space in order to prevent a radiation of the required very high energy, which may disturb radio reception in the neighbourhood.
  • the resonant circuit of the oscillator includes the work piece connected in series with the inductor of this circuit by connecting it between the electrodes of a capacitor connected to the coil.
  • this capacitor is connected to the resonant circuit through a concentric high- I frequency conductor.
  • the wall of the screened space connected to the outer conductor of the concentric high-frequency supply cable is connected through a Litzen-wire to one electrode to be arranged on the work piece, while the other electrode, connected to the inner conductor of the cable, is arranged in the space in a manner such that its capacity relative to the wall of the space is at least equal to, preferably however many times higher than the capacity between the electrodes themselves.
  • the effect of such an arrangement is that the capacity of the plate capacitor fluctuating to a high extent with the work piece to be treated has connected with it in parallel an additional capacitor having a nonvariable, comparatively high value, so that fluctuations have comparatively less effect.
  • the space may be constructed at least in part from resilient, discontinuous material, for example a wire net which is compressed together with the electrode connected to the inner conductor with the interposition of a dielectric having low high-frequency losses.
  • a wire net or of a similar material has the advantage that during the treatment the work piece can be observed and that any gases or vapors developed can escape.
  • the space itself, if freedom from interference is required, may be provided with a double wall in known manner, so that a double screening is obtained.
  • a work piece is to be heated in the space requiring a gauge, for example the seat of a chair made from various layers of Wood, or the like, it is of advantage to construct the space in a manner such that a gauge required to form the work piece lies at least partly outside the space and the resilient wall of the space is temporarily deformed by the gauge.
  • a gauge required to form the work piece lies at least partly outside the space and the resilient wall of the space is temporarily deformed by the gauge.
  • Fig. l is a schematic diagram in sectional view of an embodiment of the device of the present invention.
  • Fig. 2 is a schematic diagram in sectional view of a modification 0f the embodiment of Fig. 1.
  • the concentric cable of the highfrequency generator is designated by 1; the cable is connected to an elongated space, of which part 2 is made of sheet iron and the upper part 3 of a wire net.
  • part 2 is made of sheet iron and the upper part 3 of a wire net.
  • a window 4 of angular metal At the right-hand end of the space provision is made of a window 4 of angular metal; the window can be closed by means of a flap 5 and serves for introducing or removing the work piece.
  • the space is provided with two plate-shaped electrodes 6 and 7, of which the first is connected through a flexible Litzen-wire 8 to the wire net 3, which is connected in turn to the grounded screening sheath of the concentric cable 1.
  • the inner conductor of the cable 1 is connected directly to the electrode 7.
  • the electrode 7 is supported by two stay members 9 and 9, which are made from a dielectric material suitable for high-frequencies and which have a size such that a suitable capacity between the electrode 7 and the space wall is produced.
  • a piece 10 of different layers of wood, which are to be joined by means of suitable glue by high-frequency heating, is placed between the electrodes 6 and-7.
  • suitable pressure means comprising a screw spindle 11, which exerts pressure, through a suitable intertnediate layer, on the electrode 6 and hence 'on the work piece 10.
  • FIG. 2 A modification of the embodiment of Fig. 1, for joining curved plywood sheets, is shown in Fig. 2.
  • the space is constituted in this case by a wire net 3 which surrounds the work piece and which can be opened at the end remote from the concentric conductor 1 in order to render the interior accessible. After the required parts have been placed therein, the space is closed; in this case simply by winding up the open end of the wire net 3, for example in the manner shown.
  • the electrodes 6 and 7 which are connected to the metal wall of the space and to the inner conductor of the concentric cable 1, respectively.
  • the dielectric 9, having low high-frequency losses is made'of a resilient material, for example synthetic resin.
  • a work piece 10 of the curved shape shown is to be manufactured; this requires gauges 12 and 12', of which one is positioned outside the space, and the other is positioned inside the space.
  • the gauge part 12' may also be positioned outside the space.
  • a high-frequency-heating device-as claimed in'claim 1, wherein-said last-mentioned means comprises dielectric material having lowhigh frequency losses and interposed between said one electrode and said electrically conductive material.
  • a high-frequency heating device as claimed in claim -1,-furthercomprising at "least one gauge “for” shaping a body'positioned between said pairof electrodes, said'gauge beingpositioned "at least partly outside said enclosure,
  • a high-frequencyheating device for heating a body positioned between a pair of electrodes comprising an electrically conductive wirescreen'formingvanenclosure, a coaxial cable, a pair of spaced heating electrodes positioned irr sa'id enclosure, meansfor supplying energy from said: cableto said pair'ofielectrodesand' to said screen, a gauge for shaping said body, ariddielectric material having 10w high-frequency losses interposed between one of said pair tofzelectrodesaand a.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Veneer Processing And Manufacture Of Plywood (AREA)
  • Constitution Of High-Frequency Heating (AREA)
US443586A 1953-10-14 1954-07-15 High-frequency heating device Expired - Lifetime US2824940A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE754073X 1953-10-14

Publications (1)

Publication Number Publication Date
US2824940A true US2824940A (en) 1958-02-25

Family

ID=6658990

Family Applications (1)

Application Number Title Priority Date Filing Date
US443586A Expired - Lifetime US2824940A (en) 1953-10-14 1954-07-15 High-frequency heating device

Country Status (3)

Country Link
US (1) US2824940A (de)
BE (1) BE532457A (de)
GB (1) GB754073A (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2892915A (en) * 1957-06-19 1959-06-30 Armstrong Cork Co Dielectric heater electrode systems

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3413434A (en) * 1965-09-14 1968-11-26 Dorplastex A G Production of structural elements having a foam-plastic core in an electric high frequency field
US4296299A (en) * 1979-12-31 1981-10-20 General Electric Company Apparatus for thawing frozen food in a refrigeration appliance
US4333521A (en) * 1979-12-31 1982-06-08 General Electric Company Apparatus for thawing frozen food
US4303820A (en) * 1979-12-31 1981-12-01 General Electric Company Capacitative apparatus for thawing frozen food in a refrigeration appliance
EP0601026A1 (de) * 1991-08-30 1994-06-15 Eilsberger Elektronik Gmbh Schweissgerät zum querverschweissen von mit flüssigkeit gefüllten kunststoffschläuchen

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1962796A (en) * 1931-12-18 1934-06-12 Wappler Frederick Charles High frequency apparatus
US2073880A (en) * 1935-06-19 1937-03-16 Solar Mfg Corp Interference eliminating device
US2203517A (en) * 1938-05-28 1940-06-04 Gen Electric Radio receiver
GB556292A (en) * 1942-07-23 1943-09-28 Rediffusion Ltd Improvements in and relating to high frequency electric heating apparatus
US2467782A (en) * 1947-09-20 1949-04-19 Westinghouse Electric Corp Dielectric heating means with automatic compensation for capacitance variation
US2572226A (en) * 1947-04-24 1951-10-23 Raytheon Mfg Co Welding of thermoplastic materials with application of highfrequency dielectric energy and pressure
US2711468A (en) * 1951-12-28 1955-06-21 Nat Cylinder Gas Co Dielectric heating tunnels
US2732473A (en) * 1956-01-24 ellsworth

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2732473A (en) * 1956-01-24 ellsworth
US1962796A (en) * 1931-12-18 1934-06-12 Wappler Frederick Charles High frequency apparatus
US2073880A (en) * 1935-06-19 1937-03-16 Solar Mfg Corp Interference eliminating device
US2203517A (en) * 1938-05-28 1940-06-04 Gen Electric Radio receiver
GB556292A (en) * 1942-07-23 1943-09-28 Rediffusion Ltd Improvements in and relating to high frequency electric heating apparatus
US2572226A (en) * 1947-04-24 1951-10-23 Raytheon Mfg Co Welding of thermoplastic materials with application of highfrequency dielectric energy and pressure
US2467782A (en) * 1947-09-20 1949-04-19 Westinghouse Electric Corp Dielectric heating means with automatic compensation for capacitance variation
US2711468A (en) * 1951-12-28 1955-06-21 Nat Cylinder Gas Co Dielectric heating tunnels

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2892915A (en) * 1957-06-19 1959-06-30 Armstrong Cork Co Dielectric heater electrode systems

Also Published As

Publication number Publication date
GB754073A (en) 1956-08-01
BE532457A (de)

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