US3581251A - Microwave tube cooling assembly - Google Patents

Microwave tube cooling assembly Download PDF

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Publication number
US3581251A
US3581251A US803256*A US3581251DA US3581251A US 3581251 A US3581251 A US 3581251A US 3581251D A US3581251D A US 3581251DA US 3581251 A US3581251 A US 3581251A
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US
United States
Prior art keywords
plates
microwave tube
assembly according
resonator
air
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
US803256*A
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English (en)
Inventor
Friedrich Potzl
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.)
US Philips Corp
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US Philips Corp
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Filing date
Publication date
Priority claimed from DEP44196A external-priority patent/DE808811C/de
Application filed by US Philips Corp filed Critical US Philips Corp
Application granted granted Critical
Publication of US3581251A publication Critical patent/US3581251A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J7/00—Details not provided for in the preceding groups and common to two or more basic types of discharge tubes or lamps
    • H01J7/24—Cooling arrangements; Heating arrangements; Means for circulating gas or vapour within the discharge space

Definitions

  • Axial metal plates in the tubular pieces form an ex tremely low resistance to the flow of cooling air while exhibiting very high damping for the resonator waves.
  • SHEET 1 BF 3 IN VENTOR.
  • SHEET 2 BF 3 INVENTOR
  • SHEET 3 [IF 3 INVENTOR FRIEDRICH PO'TZL BY w AGENT MICROWAVE TUBE COOLING ASSEMBLY
  • the invention relates to a connecting flange for a microwave tube arranged in an external resonator space, said connecting flange having two tubular pieces for the inlet and the outlet of the cooling air, respectively, while the openings of the tubular pieces are prepared to have a high damping for the microwaves of the resonator space.
  • Hitherto tubular pieces have been employed, which are fastened at right angles to a flange, while the flanges are arranged side by side opposite each other in the resonator wall.
  • these openings have been covered by copper gauze or a perforated copper plate.
  • the invention has for its object to mitigate said disadvantages as far as possible.
  • the two tubular pieces for the inlet and the outlet of cooling air of a metal connecting flange for cooling a tube arranged in an external resonator space, the cooling air openings being provided with a damping member for the resonator waves are arranged side by side at opposite angles to the axis of symmetry of the flange on said flange so that the air stream follows an approximately a-shaped path around the tube to be cooled, while the tubular pieces are provided with axial metal plates providing high damping of the microwaves of the resonator, but forming a low resistance to the stream of cooling air.
  • the invention is based on the phenomenon described in Philips Technisch Tijdschrift annum 23, 1961/62, page I96 that microwaves are subjected to strong damping in rectangular hollow wave-pipes, if their frequency lies below the socalled limit frequency.
  • the coolingair tubes can therefore not give rise to high losses of high frequency energy.
  • the slanting position of the tubular pieces is very conductive to guide the coolant, for example, cooling air.
  • the air enters the resonator space in oblique direction, flows around the microwave tube along an approximately a-shaped path and emerges from the other slanting tubular piece.
  • the axial metal plates in these tubular pieces form an extremely low resistance to the flow of cooling air.
  • these metal plates together and with the inner walls of the tubes form hollow waveguide compartments for the frequencies lying in the microwave range, which compartments exhibit very high damping for the resonator waves.
  • the plates according to the invention may have a particular shape inside the tubular pieces.
  • the plates may be arranged in the form of a star or at right angles to each other, for example, so that they form a grating.
  • One or more plates may furthermore be cylindrical.
  • a cylindrical plate may be arranged coaxially in a tubular piece, while it is provided on the outer side with radial plates extending axially at right angles to the other wall up to the inner wall of the tubular piece.
  • some of the radial plates may be extended inside the cylindrical plate up to the axis of the tubular piece.
  • the total sectional area of a tubular piece is divided by the plates according to the invention into a plurality of tubular passages of small diameters, while the individual sectional areas of the passages have substantially the same dimensions.
  • the number of such plates must, ofcourse, not be too great, since otherwise the resistance to the flow would become appreciable.
  • the number may be adapted with sufficient accuracy to the highest microwave frequency at which a predetermined minimum damping must still be obtained.
  • connection of the plates with the inner wall of the tube may be established by means of soft solder or a welding joint or by the natural elasticity of the metal plates when suitably shaped.
  • the elasticity has, of course, to be such that the plates cannot be carried along by the air stream.
  • a mechanical anchoring has to be provided.
  • the tubular pieces may have a tapering inner wall so that the insert has also to be tapering and thus cannot be carried along in the direction of flow of the air.
  • the separate passages into which the sectional area of the tube is divided by thin plates should have a sectional area of a length approximately equal to the width measured at right angles thereto. Therefore, a square sectional area of the passages is most favorable.
  • FIG. 1 is partly a side elevation and partly a sectional view of a metal connecting flange for cooling air having two tubular pieces secured thereto.
  • FIG. 2 is a plan view of the device of FIG. I, viewed from the inner side of the external resonator.
  • FIG. 3 shows a metal insert having axial plates in accordance with the invention.
  • FIGS. 4 to 12 show various forms of metal inserts of the tubular pieces in accordance with the invention.
  • reference numeral 1 designates the metal connecting flange which partly covers the opening concerned in the wall of the external resonator.
  • the flange is provided with two tubular pieces also of a metal, the axes of which are slightly slanting towards each other and at opposite angles to the axis normal to the head face of the flange. These two tubular pieces are designated by 2 and 3 in FIG. 1.
  • the air is passed in the direction of the arrow 4 by pressure into the external resonator; it flows around the microwave tube 5 and emerges from the resonator space in the direction of the arrow 6 through the tubular piece 3.
  • the air stream can follow a substantially a-shaped path around the, for example, horizontal microwave tube 5, while it can flow, in addition, upwards and downwards along the tube.
  • the two tubular pieces 2 and 3 are arranged one above or one below the other, the cooling air entering, for example, through the lower piece.
  • FIG. 2 is an elevation of the device of FIG. I, in which the position of the metal inserts 7 in the tubular pieces 2 and 3 is clearly shown.
  • FIG. 3 shows a substantially star-shaped metal insert of axially extending plates, which may be connected with the inner walls of the tubular pieces 2 and 3 in various ways as shown in FIGS. 4 and 5; by means of soft solder as shown in FIGS. 4 to 8 and by simply bending over the ends of the plates arranged in a star shape as shown in FIGS. 5 to Q.
  • the insert of FIG. 5 can therefore always by drawn out.
  • FIG. shows a device having orthogonal plates forming a grating.
  • FIG. 11 shows a device comprising a cylindrical plate arranged coaxially in a tubular piece and provided at its surface with radial plate at right angles to said surfaces. These plates have their larger dimensions in the axial direction.
  • FIG. 12 shows a further variant of this device.
  • All inserts may be formed by relatively fitting plates, or plates solderable to each other as is most appropriate for the purpose aimed at when the inner walls of the tubular pieces have a tapering shape, especially the tubular piece for the inlet of the cooling air, the metal insert or the plates interconnected in various ways maybe bevelled so that the plates fit accurately and no further fastening means are required for preventing shift of the plates by the air stream. Since this shape is quite simple, it is not shown in the drawing. The inlet piece will taper inwardly and the outlet piece will taper outwardly, viewed from the resonator space.
  • An assembly for use with a supply of cooling air to cool a microwave tube comprising a housing with a resonant cavity in which the microwave tube isdisposed, and connected to a wall of the housing, inlet and outlet conduits through which cooling air is supplied, directed to flow about said microwave tube in the cavity, and subsequently discharged, the conduits being disposed adjacently and oriented at a mutually oblique angle whereby the air may flow about a loop-shaped path in the cavity around the microwave tube, and a damping member formed of axially extending plates disposed within at least one of said conduits and defining a plurality of passages providing high damping of resonator microwaves but a low resistance to the air stream.

Landscapes

  • Constitution Of High-Frequency Heating (AREA)
  • Cooling Or The Like Of Semiconductors Or Solid State Devices (AREA)
  • Physical Or Chemical Processes And Apparatus (AREA)
  • Non-Reversible Transmitting Devices (AREA)
US803256*A 1949-05-27 1969-02-28 Microwave tube cooling assembly Expired - Lifetime US3581251A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEP44196A DE808811C (de) 1948-06-10 1949-05-27 Vorrichtung zum Zusammenhalten von Koerpern mit vorwiegender Laengserstreckung

Publications (1)

Publication Number Publication Date
US3581251A true US3581251A (en) 1971-05-25

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ID=7380133

Family Applications (1)

Application Number Title Priority Date Filing Date
US803256*A Expired - Lifetime US3581251A (en) 1949-05-27 1969-02-28 Microwave tube cooling assembly

Country Status (3)

Country Link
US (1) US3581251A (en, 2012)
FR (1) FR2003546A1 (en, 2012)
GB (1) GB1189099A (en, 2012)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2467230A (en) * 1947-08-30 1949-04-12 Gen Electric Ultra high frequency dielectric heater
US2732473A (en) * 1956-01-24 ellsworth
US2868939A (en) * 1956-01-16 1959-01-13 Chemetron Corp Suppression of radiation from dielectric heating applicators
US3050606A (en) * 1958-08-11 1962-08-21 Radio Heaters Ltd Radio frequency dielectric heating apparatus

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2732473A (en) * 1956-01-24 ellsworth
US2467230A (en) * 1947-08-30 1949-04-12 Gen Electric Ultra high frequency dielectric heater
US2868939A (en) * 1956-01-16 1959-01-13 Chemetron Corp Suppression of radiation from dielectric heating applicators
US3050606A (en) * 1958-08-11 1962-08-21 Radio Heaters Ltd Radio frequency dielectric heating apparatus

Also Published As

Publication number Publication date
DE1639371A1 (de) 1971-02-04
GB1189099A (en) 1970-04-22
FR2003546A1 (en, 2012) 1969-11-07
DE1639371B2 (de) 1976-02-05

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