EP3511972A1 - Effiziente wärmeabfuhr über gleitlager einer drehanode - Google Patents

Effiziente wärmeabfuhr über gleitlager einer drehanode Download PDF

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Publication number
EP3511972A1
EP3511972A1 EP18151199.9A EP18151199A EP3511972A1 EP 3511972 A1 EP3511972 A1 EP 3511972A1 EP 18151199 A EP18151199 A EP 18151199A EP 3511972 A1 EP3511972 A1 EP 3511972A1
Authority
EP
European Patent Office
Prior art keywords
heat sink
rotary anode
axial end
channel
bearing
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.)
Withdrawn
Application number
EP18151199.9A
Other languages
German (de)
English (en)
French (fr)
Inventor
Thomas Ohrndorf
Lothar Werner
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 Healthcare GmbH
Original Assignee
Siemens Healthcare GmbH
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 Siemens Healthcare GmbH filed Critical Siemens Healthcare GmbH
Priority to EP18151199.9A priority Critical patent/EP3511972A1/de
Priority to CN201920039220.3U priority patent/CN209880532U/zh
Publication of EP3511972A1 publication Critical patent/EP3511972A1/de
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J35/00—X-ray tubes
    • H01J35/02—Details
    • H01J35/04—Electrodes ; Mutual position thereof; Constructional adaptations therefor
    • H01J35/08—Anodes; Anti cathodes
    • H01J35/10—Rotary anodes; Arrangements for rotating anodes; Cooling rotary anodes
    • H01J35/105—Cooling of rotating anodes, e.g. heat emitting layers or structures
    • H01J35/106—Active cooling, e.g. fluid flow, heat pipes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2235/00—X-ray tubes
    • H01J2235/12—Cooling
    • H01J2235/1208—Cooling of the bearing assembly

Definitions

  • the present invention is based on a heat sink for an inner bearing of a rotary anode of an X-ray arrangement.
  • the inner bearing has a rotation axis facing, cylindrical around the rotation axis encircling inside, which defines a parallel to the axis of rotation of the rotary anode extending cylindrical cavity radially.
  • X-ray sources often have a rotary anode.
  • the rotary anode is often exposed to high thermal loads during operation. The loads can be so high that the rotary anode glows.
  • the procedures are often used in parallel.
  • One of the methods consists in first introducing part of the heat energy produced during operation in the rotary anode into the co-rotating outer bearing of a slide bearing and dissipating the heat energy from there into the stationary inner bearing of the slide bearing.
  • the bottom bracket is in turn hollow and is flowed through by a cooling medium.
  • the cooling medium may be a liquid cooling medium such as oil or water or a gaseous cooling medium such as in particular air or a protective gas (nitrogen, argon).
  • fins are introduced into the cavity of the inner bearing, which are soldered at their adjacent to the inner bearing ends of the inner bearing. Due to the shape of the slats and the limited space in the cavity of the inner bearing can be ensured in practice often no reliable connection of all slats to the bottom bracket. Furthermore, within the cavity, a sharp reversal of the direction of the cooling medium by 180 ° takes place. This deflection leads to a large pressure loss, so that a correspondingly high pump power is required to lead despite the high pressure loss, a sufficiently large amount of cooling medium through the cavity.
  • Another embodiment is to provide a labyrinth arrangement in the cavity. Although such arrangements have a large surface area and furthermore ensure high heat input into the cooling medium due to turbulence within the cooling medium. Due to the turbulence, however, the flow resistance increases, so that here too a high pump power is required to guide a sufficiently large amount of cooling medium through the hollow shaft.
  • the object of the present invention is to provide ways by which the required cooling of the inner bearing of the rotary anode can be ensured in a reliable and efficient manner.
  • the first channel section at the first axial end of the main section merges into a tubular, substantially in the direction of the major axis extending terminal portion.
  • the heat sink preferably has a conical additional section at its second axial end.
  • the conical-like additional section offers on the one hand often manufacturing advantages in the manufacture of the heat sink and facilitates other often the introduction of the heat sink in the bottom bracket.
  • the conical-like additional portion has an obtuse opening angle.
  • the heat sink extends only to a small extent. This is particularly important because in the additional section usually neither of the two channel sections runs.
  • the opening angle is usually between 90 ° and 150 °, for example between 100 ° and 140 °, in particular between 110 ° and 130 °. Particularly preferably, the opening angle is about 120 °.
  • the heat sink may for example consist of copper or molybdenum.
  • the heat sink is designed as a manufactured according to an additive manufacturing process body, which is processed after the additive manufacturing on its lateral surface material removal, so that the lateral surface has a defined diameter.
  • This way of producing the heat sink is particularly simple.
  • the main section preferably has recesses on its lateral surface. This makes it possible in particular to introduce a solder for soldering the heat sink in the inner bearing of the rotary anode in the recesses.
  • the heat sink is thus a filler which fills the recess of the inner bearing.
  • the recesses preferably run around the main axis like a helix. Thereby, the recesses can be made relatively large volume, so that a sufficiently large amount of solder can be introduced into the recesses and subsequently also in the soldering process as such a reliable, large-scale connection of the heat sink can be made with the bottom bracket.
  • an X-ray device having the features of claim 11.
  • an X-ray arrangement of the type mentioned above is configured in that the inner bearing has a rotation axis facing, cylindrical around the rotation axis inner side which defines a parallel to the axis of rotation of the rotary anode extending cylindrical cavity radially and arranged in the cavity an inventively ausgestalteter heatsink is and that the lateral surface of the heat sink is soldered via a solder connection to the inside of the cavity.
  • an X-ray arrangement with the features of claim 12.
  • an X-ray arrangement of the type mentioned above is configured in that the bottom bracket is designed as a heat sink according to the invention.
  • an X-ray arrangement has a rotary anode 1.
  • the rotary anode 1 is arranged in an X-ray tube 2 and is there in a vacuum or near vacuum.
  • the rotary anode 1 is rotated in operation in a conventional manner about a rotation axis 3.
  • the rotary anode 1 is rotatably mounted in a bearing.
  • the warehouse is located within the X-ray tube 2 points - see also FIG. 2 -
  • the outer bearing 5 is rotatably connected to the rotary anode 1.
  • the outer bearing 5 rotates when rotating the rotary anode 1 with.
  • the bottom bracket 4 is fixedly arranged.
  • the inner bearing 4 does not rotate during rotation of the rotary anode 1.
  • a rotor 6 is further arranged within the X-ray tube 2, which cooperates with a stator 7.
  • the rotor 6 and the stator 7 together form an electric motor, by means of which the rotation of the rotary anode 1 is effected.
  • the stator 7 is usually arranged outside the x-ray tube 2. The arrangement of rotor 6 and stator 7 and their operation is well known to those skilled in the art. As such, they are not the subject of the present invention.
  • the inner bearing 4 is formed hollow in the rule. It has in this case a cavity 8.
  • the cavity 8 extends parallel to the axis of rotation 3 of the rotary anode 1. It has a cylindrical shape.
  • the cavity 8 is bounded radially by the inner bearing 4, more precisely by an inner side 9 of the inner bearing 4, which, viewed from the inner bearing 4, faces the axis of rotation 3 of the rotary anode 1 and rotates cylindrically about the axis of rotation 3.
  • a heat sink 10 is arranged in the cavity 8.
  • the heat sink 10 has - see also the FIG. 3 and 4 - An outer circumferential surface 11.
  • the lateral surface 11 of the heat sink 10 is soldered via a solder connection 12 with the inside 9 of the cavity 8.
  • a thickness of the solder joint 12 is often in the range of less than 0.1 mm.
  • the cooling medium 13 is usually liquid, in exceptional cases gaseous.
  • the production and configuration of the heat sink 10 is the actual subject of the present invention.
  • the heat sink 10 has according to the FIG. 3 and 4 a main section 14.
  • the main portion 14 is formed substantially cylindrical.
  • the main portion 14 has the lateral surface 11, which in turn rotates substantially cylindrically around a main axis 15 of the heat sink 10 due to the cylindrical shape of the main portion 14.
  • the main portion 14 extends in the direction of the main axis 15 from a first axial end 16 to a second axial end 17 of the main portion 14.
  • the second axial end 17 of the main portion 14 is that axial end which is inserted deepest in the cavity 8, when the heat sink 10 is soldered into the bottom bracket 4.
  • the main section 14 has a channel 18.
  • the channel 18 has a uniform cross-section over substantially its entire length.
  • the cross section may in particular be circular and correspond to a diameter d.
  • the cooling medium 13 is guided from the first axial end 16 to the second axial end 17 of the main portion 14 and back to the first axial end 16.
  • the guiding of the cooling medium 13 from the first axial end 16 to the second axial end 17 of the main section 14 takes place in a first channel section 19 of the channel 18, guiding the cooling medium 13 back to the first axial end 16 in a second channel section 20 of the channel 18.
  • the two Channel sections 19, 20 run, in particular from the FIG.
  • a pitch s of the two channel sections 19, 20 is only slightly larger than twice the diameter d of the channel 18. The pitch s can in particular between 2.3 times and 3.0 times the Diameter d of the channel 18 are.
  • the two channel sections 19, 20 merge into one another.
  • the two channel sections 19, 20 are in FIG. 4 each additionally supplemented by a small letter a, b, etc. in order to indicate the flow direction in which the cooling medium 13 flows through the two channel sections 19, 20.
  • the flow direction can also be directed oppositely.
  • the first channel section 19 merges into a tubular connection section 21 at the first axial end 16 of the main section 14.
  • the connecting portion 21 is also part of the heat sink 10. It extends substantially in the direction of the main axis 15. This can easily a connecting line 22 - see FIG. 2 - Are connected to the connection section 21.
  • the connecting line 22 is no longer part of the heat sink 10. It can be designed as a tube.
  • the recesses 23 can rotate in particular helically around the main axis.
  • the slope of the recesses 23 preferably corresponds 1: 1 with the slope s of the two channel sections 19, 20.
  • a solder 24 may be introduced, by means of which later the heat sink 10 is soldered into the bottom bracket 4 of the rotary anode 1 ,
  • the solder 24 may in particular be a silver solder.
  • the heat sink 10 preferably has a conical additional portion 25.
  • An opening angle ⁇ of the additional section 25 is preferably obtuse, ie greater than 90 °.
  • the opening angle ⁇ can be up to 150 ° in the rule. In exceptional cases, an even larger opening angle ⁇ possible. In most cases, the opening angle ⁇ lies between these two extreme values, for example between 100 ° and 140 °, in particular between less than 110 ° and 130 °. In the specific embodiment, the opening angle ⁇ is about 120 °.
  • the heat sink 10 is preferably produced according to an additive manufacturing method. In principle, therefore, it is designed as a body manufactured according to an additive manufacturing process. Additive manufacturing processes are well known to those skilled in the art, keyword "3-D printers”.
  • the heat sink 10 can therefore be produced only with a correspondingly limited accuracy.
  • the heat sink 10 is manufactured as such.
  • the heat sink 10 is machined on its lateral surface 11 (indicated in step S2 by a "-", because material is removed). Material removing operations, such as milling or turning, can be performed with significantly better accuracy. This makes it possible to carry out the step S2 such that the lateral surface 11 after the execution of step S2 the defined diameter D (see FIG. 4 ) having.
  • the heat sink 10 usually has relatively small dimensions.
  • the diameter D is usually in the range between 12 mm and 25 mm, for example at about 16 mm.
  • a length L of the main section 14, ie the distance between the first and the second axial end 16, 17, is usually in the range between 70 mm and 120 mm, for example at about 80 mm.
  • the material of the heat sink 10 may be determined as needed.
  • the heat sink 10 made of copper or molybdenum.
  • the heat sink 10 is identical to the bottom bracket 4 and is an integral part of the bottom bracket 4.
  • the present invention thus relates to the following facts:
  • a heat sink 10 for an inner bearing 4 of a rotary anode 1 of an X-ray arrangement has a main portion 14 which has a substantially cylindrical circumferential surface 11 about a main axis 15 of the heat sink 10 and seen in the direction of the main axis 15 from a first axial end 16 to a second axial end 17 of the main portion 14 extends.
  • the main section 14 has a channel 18 for a liquid or gaseous cooling medium 13, which has a first channel section 19 and a second channel section 20.
  • the two channel sections 19, 20 run, starting from the first axial end 16 of the main section 14, respectively helically about the main axis 15 to the second axial end 17 to. They merge into one another at the second axial end 17 of the main section 14.
  • the present invention has many advantages. Due to the surface contact between the inner side 9 of the inner bearing 4 and outer surface 11 of the heat sink 10, a good thermal contact and thus a low thermal resistance in the transition from the bottom bracket 4 to the heat sink 10 are achieved.
  • the diameter D of the heat sink 10 can be matched to the diameter of the cavity 8 with high accuracy (0.1 mm or better).
  • a special soldering tool is not required. The soldering process as such is reliable.
  • the amount of broke in soldering the heat sink 10 into the bottom bracket 4 can be reduced over the prior art approach.
  • the flow resistance for the cooling medium 13 is kept low, so that - at a comparable volume flow - compared to the prior art, the pump for conveying the cooling medium 13 can be made smaller. Due to the large contact surface of the cooling medium 13 with the walls of the channel sections 19, 20 a good heat transfer is nevertheless ensured in the cooling medium 13.

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  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • X-Ray Techniques (AREA)
EP18151199.9A 2018-01-11 2018-01-11 Effiziente wärmeabfuhr über gleitlager einer drehanode Withdrawn EP3511972A1 (de)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP18151199.9A EP3511972A1 (de) 2018-01-11 2018-01-11 Effiziente wärmeabfuhr über gleitlager einer drehanode
CN201920039220.3U CN209880532U (zh) 2018-01-11 2019-01-10 X射线装置的旋转阳极的内支承件的冷却体和x射线装置

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP18151199.9A EP3511972A1 (de) 2018-01-11 2018-01-11 Effiziente wärmeabfuhr über gleitlager einer drehanode

Publications (1)

Publication Number Publication Date
EP3511972A1 true EP3511972A1 (de) 2019-07-17

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Family Applications (1)

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EP18151199.9A Withdrawn EP3511972A1 (de) 2018-01-11 2018-01-11 Effiziente wärmeabfuhr über gleitlager einer drehanode

Country Status (2)

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EP (1) EP3511972A1 (zh)
CN (1) CN209880532U (zh)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114429891A (zh) * 2021-12-28 2022-05-03 安徽理工大学 一种用于医学ct机轴承的冷却装置
DE202022104389U1 (de) 2021-09-09 2022-08-23 Siemens Healthcare Gmbh Effiziente Wärmeabfuhr über Gleitlager einer Drehanode
EP4141905A1 (de) * 2021-08-25 2023-03-01 incoatec GmbH Röntgenröhre mit einem isolationskörper, der einen gusskörper umfasst

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111081512A (zh) * 2019-12-25 2020-04-28 陈庆春 一种反射式x光管冷却机构

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE674415C (de) * 1931-03-01 1939-04-14 Koch & Sterzel Akt Ges Aus Isoliermaterial bestehendes Hochspannungsschutzgehaeuse fuer gekuehlte Vakuum-, insbesondere Roentgenroehren
JPH04370636A (ja) * 1991-06-19 1992-12-24 Hitachi Medical Corp 回転陽極ｘ線管
EP1094491A2 (en) * 1999-10-18 2001-04-25 Kabushiki Kaisha Toshiba X-ray tube of rotary anode type
US20030015394A1 (en) * 1998-09-15 2003-01-23 Rolcon, Inc. Conveyor roller assembly
US20100111265A1 (en) * 2007-06-06 2010-05-06 Comet Holding Ag X-ray tube with an anode isolation element for liquid cooling and a receptacle for a high-voltage plug
JP2017054641A (ja) * 2015-09-08 2017-03-16 東芝電子管デバイス株式会社 回転陽極型ｘ線管及び回転陽極型ｘ線管装置

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE674415C (de) * 1931-03-01 1939-04-14 Koch & Sterzel Akt Ges Aus Isoliermaterial bestehendes Hochspannungsschutzgehaeuse fuer gekuehlte Vakuum-, insbesondere Roentgenroehren
JPH04370636A (ja) * 1991-06-19 1992-12-24 Hitachi Medical Corp 回転陽極ｘ線管
US20030015394A1 (en) * 1998-09-15 2003-01-23 Rolcon, Inc. Conveyor roller assembly
EP1094491A2 (en) * 1999-10-18 2001-04-25 Kabushiki Kaisha Toshiba X-ray tube of rotary anode type
US20100111265A1 (en) * 2007-06-06 2010-05-06 Comet Holding Ag X-ray tube with an anode isolation element for liquid cooling and a receptacle for a high-voltage plug
JP2017054641A (ja) * 2015-09-08 2017-03-16 東芝電子管デバイス株式会社 回転陽極型ｘ線管及び回転陽極型ｘ線管装置

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4141905A1 (de) * 2021-08-25 2023-03-01 incoatec GmbH Röntgenröhre mit einem isolationskörper, der einen gusskörper umfasst
DE202022104389U1 (de) 2021-09-09 2022-08-23 Siemens Healthcare Gmbh Effiziente Wärmeabfuhr über Gleitlager einer Drehanode
CN114429891A (zh) * 2021-12-28 2022-05-03 安徽理工大学 一种用于医学ct机轴承的冷却装置
CN114429891B (zh) * 2021-12-28 2024-01-30 安徽工程大学 一种用于医学ct机轴承的冷却装置

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Publication number Publication date
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