US3553514A - A cooling gasket for oil filled x-ray tubes - Google Patents

A cooling gasket for oil filled x-ray tubes Download PDF

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Publication number
US3553514A
US3553514A US730788A US3553514DA US3553514A US 3553514 A US3553514 A US 3553514A US 730788 A US730788 A US 730788A US 3553514D A US3553514D A US 3553514DA US 3553514 A US3553514 A US 3553514A
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US
United States
Prior art keywords
envelope
ring
oil
glass
anode
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
US730788A
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English (en)
Inventor
Werner Berends
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
Original Assignee
US Philips 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
Application filed by US Philips Corp filed Critical US Philips Corp
Application granted granted Critical
Publication of US3553514A publication Critical patent/US3553514A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05G—X-RAY TECHNIQUE
    • H05G1/00—X-ray apparatus involving X-ray tubes; Circuits therefor
    • H05G1/02—Constructional details
    • H05G1/04—Mounting the X-ray tube within a closed housing
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J35/00—X-ray tubes
    • H01J35/02—Details
    • H01J35/16—Vessels; Containers; Shields associated therewith
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05G—X-RAY TECHNIQUE
    • H05G1/00—X-ray apparatus involving X-ray tubes; Circuits therefor
    • H05G1/02—Constructional details
    • H05G1/025—Means for cooling the X-ray tube or the generator

Definitions

  • Trifari ABSTRACT An X-ray tube in an oil-filled envelope has a stationary anode projecting beyond a glass envelope and is connected to the glass envelope by a metal alloy ring having a coefficient of expansion matching that of the glass. In order to prevent heat conduction between the metal ring and the oil filling, the ring is surrounded by a narrowly fitting foam layer covering the metal ring and glass envelope.
  • a solution may be found in an additional water cooling of the anode in front of the focal area or of the whole envelope, but this is complicated and'considerably raises the weight of the device.
  • a further possibility resides in an enlargement of the volume of the envelope so that the quantity of heat given off by irradiation increases and the power fed to the anode may be increased.
  • the enlargement of the dimensions involves an increase in cost and in weight of the device, whilst the replacement of a tube in an envelope already in use by a tube of higher power requires a new envelope.
  • the invention has for its object to avoid the aforesaid disadvantages involved in the loadability of an X-ray tube having a stationary anode projecting from the envelope.
  • a metal ring connecting the anode with the glass bulb is surrounded by a narrowly fitting layer of foam material so that oil convection is completely avoided.
  • FIG. 1 shows the part of a sectional view of a known construction of an X-ray tube having a radiation exit outside the tube envelope;
  • FIG. 2 illustrates the application of the invention with reference to a detail of FIG. 1.
  • FIG. I shows the anode part of an X-ray tube 10, the stationary anode l of which projects outsidethe envelope formed by a jacket 7 and a closing cap 3, the X-ray tube 10 being arranged inside the envelope, while the space between the envelope and the tube is filled with insulating oil.
  • the anode 1 of the vX-ray tube I0 is formed by a hollow cylindrical body whose end projecting from the envelope is closed by a copper spectator.
  • the anode cylinder 1 and the glass bulb 5 are inter-v connected in a vacuum-tight manner by a ring 4 of a hollow alloy, the expansion coefficient of which'corresponds approximately with that of the glass.
  • the bottom 6 of the anode can be cooled by circulating water, as is indicated in the drawing by arrows.
  • the cooling is then mainly effective in the proximity of the anode bottom 6.
  • the anode pdrt projecting in the envelope and the seala ing ring connected therewith may, however, attain high temperatures, which are not capable, it is true, of damaging the metal or the sealing areas, but certainly of heating strongly the insulating oil surrounding ,them.
  • the electrical permanent power fed to the tube has to be such that a maximum temperature of the envelope prescribed for reasons of safety is not exceeded. In such an arrangement envelope temperatures of C. were measured with a permanent power of 3 kW and at 20 C. room temperature.
  • FIG. 2 shows that the ring and the anode parts projecting from the glass body are surrounded by a foam lining 11, which screens said parts against the oil.
  • a foam lining 11 which screens said parts against the oil.
  • Suitable foam is particularly polyurethane, which is sufficiently resistant to the temperatures of the anode cylinder and to the hot transformer oil.
  • a channel may be made in the foam substance as is indicated in FIG. 2 by broken lines, which channel communicates with the filling opening.
  • the foam substance collar 11 it is preferred to use an envelope cap specially made this purpose and having its conical part bored to an approximately 1 mm greater spacing for receiving the X-ray tube. After a layer of wax is applied to the envelope cap and the mixed foam constituents are introduced, the solid thermoplastic foam body is formed, which surrounds the tube in the form of a collar. The tube with the collar can be easily withdrawn from the mould used. When it is introduced into the envelope proper the associated envelope cap has first to be heated so that the slightly broader foam collar can be slightly compressed and a dense joint is formed.
  • Direct contact betweenthe anode cylinder and thefoam substance can be avoided by providing between the anode cylinder and the sealing ring 4 an intermediate piece which can be withdrawn after the application of the foam substance so that the space between the anode and the ring is free of the foam substance.
  • a device comprising an X-ray tube in an oil-filled envelope having a stati onary anode projecting from a glass tube envelope, the anode cylinder being connected with the glass tube envelope by a ring of a metal alloy having an expansion coefficient matching that of the glass, said .ring being surrounded by a narrowly fitting foam layer covering the joint between the metal ring and the glass tube to prevent heat conducting communication between the; metal ring and the oil filling.
  • a device as claimed in claim 1 wherein a channel is provided in the foam layer which communicates with an opening for the introduction of the insulating oil in the envelope.

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  • X-Ray Techniques (AREA)
US730788A 1967-05-26 1968-05-21 A cooling gasket for oil filled x-ray tubes Expired - Lifetime US3553514A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEM0074107 1967-05-26

Publications (1)

Publication Number Publication Date
US3553514A true US3553514A (en) 1971-01-05

Family

ID=7315451

Family Applications (1)

Application Number Title Priority Date Filing Date
US730788A Expired - Lifetime US3553514A (en) 1967-05-26 1968-05-21 A cooling gasket for oil filled x-ray tubes

Country Status (5)

Country Link
US (1) US3553514A (cs)
DE (1) DE1614162C3 (cs)
FR (1) FR1565290A (cs)
GB (1) GB1221978A (cs)
NL (1) NL6807315A (cs)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0683502A1 (en) * 1994-05-16 1995-11-22 Yusuke Shida Method of producing frit-sealed x-ray tube
WO2013069222A1 (en) * 2011-11-09 2013-05-16 Canon Kabushiki Kaisha Radiation generating tube and radiation generating apparatus

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB552721A (en) * 1941-10-16 1943-04-21 Siemens Schuckert Great Britai A new or improved x-ray tube holder
US2692340A (en) * 1951-09-09 1954-10-19 Hartford Nat Bank & Trust Co Unipolar x-ray tube provided in an oil-filled container

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB552721A (en) * 1941-10-16 1943-04-21 Siemens Schuckert Great Britai A new or improved x-ray tube holder
US2692340A (en) * 1951-09-09 1954-10-19 Hartford Nat Bank & Trust Co Unipolar x-ray tube provided in an oil-filled container

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0683502A1 (en) * 1994-05-16 1995-11-22 Yusuke Shida Method of producing frit-sealed x-ray tube
US5515412A (en) * 1994-05-16 1996-05-07 Shida; Yusuke Method of producing frit-sealed x-ray tube
WO2013069222A1 (en) * 2011-11-09 2013-05-16 Canon Kabushiki Kaisha Radiation generating tube and radiation generating apparatus
US9887063B2 (en) 2011-11-09 2018-02-06 Canon Kabushiki Kaisha Radiation generating tube, radiation generating apparatus, radiography system and manufacturing method thereof

Also Published As

Publication number Publication date
DE1614162C3 (de) 1974-08-15
GB1221978A (en) 1971-02-10
DE1614162B2 (de) 1974-01-17
NL6807315A (cs) 1968-11-27
FR1565290A (cs) 1969-04-25
DE1614162A1 (de) 1970-05-27

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