CN218996647U - Cooling body and X-ray device - Google Patents
Cooling body and X-ray device Download PDFInfo
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- CN218996647U CN218996647U CN202222384641.4U CN202222384641U CN218996647U CN 218996647 U CN218996647 U CN 218996647U CN 202222384641 U CN202222384641 U CN 202222384641U CN 218996647 U CN218996647 U CN 218996647U
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- cooling body
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- bearing
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- 238000001816 cooling Methods 0.000 title claims abstract description 120
- 239000002826 coolant Substances 0.000 claims abstract description 32
- 238000004891 communication Methods 0.000 claims abstract description 6
- 238000004519 manufacturing process Methods 0.000 claims description 25
- 238000000034 method Methods 0.000 claims description 25
- 239000000654 additive Substances 0.000 claims description 16
- 230000000996 additive effect Effects 0.000 claims description 16
- 239000000463 material Substances 0.000 claims description 14
- 238000011282 treatment Methods 0.000 claims description 9
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 8
- 229910052782 aluminium Inorganic materials 0.000 claims description 8
- 239000007788 liquid Substances 0.000 claims description 6
- 229910045601 alloy Inorganic materials 0.000 claims description 5
- 239000000956 alloy Substances 0.000 claims description 5
- 238000012886 linear function Methods 0.000 claims description 5
- 230000000737 periodic effect Effects 0.000 claims description 4
- 230000005855 radiation Effects 0.000 claims 2
- 238000013461 design Methods 0.000 description 12
- 238000012546 transfer Methods 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- 238000003466 welding Methods 0.000 description 4
- 230000017525 heat dissipation Effects 0.000 description 3
- 229910000679 solder Inorganic materials 0.000 description 3
- 230000007704 transition Effects 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 229910000881 Cu alloy Inorganic materials 0.000 description 2
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 229910052750 molybdenum Inorganic materials 0.000 description 2
- 239000011733 molybdenum Substances 0.000 description 2
- 125000006850 spacer group Chemical group 0.000 description 2
- QZLJNVMRJXHARQ-UHFFFAOYSA-N [Zr].[Cr].[Cu] Chemical compound [Zr].[Cr].[Cu] QZLJNVMRJXHARQ-UHFFFAOYSA-N 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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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
- H01J35/107—Cooling of the bearing assemblies
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J2235/00—X-ray tubes
- H01J2235/12—Cooling
- H01J2235/1225—Cooling characterised by method
- H01J2235/1262—Circulating fluids
- H01J2235/1283—Circulating fluids in conjunction with extended surfaces (e.g. fins or ridges)
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- X-Ray Techniques (AREA)
Abstract
The present utility model relates to a cooling body and an X-ray apparatus. The cooling body for the inner bearing of the rotary anode of an X-ray device has a main section which extends from a first axial end to a second axial end as seen in the axial direction of the cooling body. The main section has an outer wall on the radially outer side, which surrounds the axis of symmetry in a substantially cylindrical manner, and an inner tube on the radially inner side of the outer wall, which extends in the axial direction from the first axial end and up to at least the end facing the second axial end. An annular outer cooling channel for the cooling medium is formed between the outer wall and the inner tube, the outer cooling channel being connected at a second axial end in communication with an inner cooling channel for the cooling medium formed by the inner tube. A plurality of radially inwardly extending tabs are provided at the outer wall. The fins form rows that are circumferentially spaced apart from one another. Viewed individually, the fins of the respective rows are spaced apart from each other in the axial direction and are disposed in sequence.
Description
Technical Field
The utility model is based on a cooling body for an inner bearing of a rotating anode of an X-ray device,
wherein the cooling body has a main section which extends from a first axial end to a second axial end as seen in the direction of the symmetry axis of the cooling body,
-wherein the main section has an outer wall on the radially outer side that surrounds substantially cylindrically about the symmetry axis.
The utility model is also based on an X-ray device,
wherein the X-ray device has a rotating anode,
wherein the rotary anode is arranged in the X-ray tube and is rotatably supported therein in a bearing such that the rotary anode can rotate about a rotation axis,
wherein the bearing has an inner bearing and an outer bearing,
wherein the outer bearing is connected in a rotationally fixed manner to the rotary anode such that said outer bearing rotates together when the rotary anode rotates,
-wherein the inner bearing is fixed such that said inner bearing does not rotate together when the rotary anode rotates.
It is possible here for the inner bearing to have an inner side which surrounds the rotation axis cylindrically toward the rotation axis and which radially delimits a cylindrical cavity extending parallel to the rotation axis of the rotary anode. In this case, such a cooling body is arranged in the cavity, wherein the outer wall of the cooling body is welded to the inner side of the cavity via a welded connection.
Alternatively, it is possible for the inner bearing itself to be designed as such a cooling body.
Background
The above-mentioned subject matter is known from EP 3 511 972 A1. In EP 3 511,972 A1, the main section has channels for a liquid or gaseous cooling medium, which channels themselves have a first channel section and a second channel section. The two channel sections each spiral around the symmetry axis starting from the first axial end of the main section toward the second axial end. At the second axial end of the main section, the two channel sections merge.
The X-ray radiator typically has a rotating anode. Rotating anodes are typically subjected to high thermal loads during operation. The load may be so high that the rotating anode glows.
In order to extract the thermal energy generated in operation in the rotating anode from the rotating anode, there are different methods. The methods are typically applied in parallel. One of the methods consists in first introducing a part of the thermal energy generated in the rotating anode during operation into the co-rotating outer bearing of the sliding bearing and from there removing the thermal energy into the stationary inner bearing of the sliding bearing. The inner bearing is designed as hollow and is flown through by the cooling medium. The cooling medium may be a liquid cooling medium, for example oil or water, or a gaseous cooling medium, such as in particular air or an inert gas (nitrogen, argon). In order to improve the heat transfer from the inner bearing into the cooling medium, a sheet is introduced into the cavity of the inner bearing, which sheet is welded to the inner bearing at its end adjoining the inner bearing. Due to the shape of the lamellae and the narrow space conditions in the cavity of the inner bearing, it is often not ensured in practice that all lamellae are reliably connected to the inner bearing. Furthermore, in the cavity, the direction of the cooling medium is abruptly reversed by 180 °. The deflection causes a large pressure loss, so that a correspondingly high pump power is required in order to guide a sufficiently large amount of cooling medium through the cavity despite the high pressure loss.
Another embodiment consists in providing a labyrinth device in the cavity. Such a device has a large surface and furthermore ensures a high heat input into the cooling medium due to turbulence in the cooling medium. However, due to turbulence, the flow resistance increases, so that here too a high pump power is required in order to guide a sufficiently large amount of the cooling medium through the hollow shaft.
In contrast, the design according to EP 3 511 972 A1 has already been advanced. However, in this embodiment too, a relatively high pump pressure and a relatively high supply of cooling medium are still required in order to ensure the desired heat dissipation in the inner bearing.
Disclosure of Invention
The utility model aims to realize the following feasible scheme: by means of which the required cooling of the inner bearing of the rotating anode can be ensured in a reliable and efficient manner.
The object is achieved by a cooling body having the features of the embodiments of the utility model. An advantageous embodiment of the cooling body is the subject of an embodiment of the utility model.
According to the utility model, a cooling body of the type mentioned at the outset is designed in the following manner:
the main section has an inner tube in the radial direction within the outer wall, which inner tube extends in the direction of the axis of symmetry from a first axial end to at least an endwise second axial end, such that an annular outer cooling channel for a liquid or gaseous cooling medium is formed between the outer wall and the inner tube, and the outer cooling channel is connected in communication at the second axial end with an inner cooling channel for the cooling medium formed by the inner tube,
-a plurality of fins provided at the outer wall
The fins extend radially inwardly from the outer wall toward the inner tube,
the fins form a plurality of rows, which are spaced apart from each other as seen in a circumferential direction about the axis of symmetry, an
The fins of the respective rows are spaced apart from each other seen in the direction of the symmetry axis and are arranged in sequence seen in the direction of the symmetry axis, seen individually.
It is surprisingly possible with this design to ensure, on the one hand, a high heat dissipation, for which only a comparatively low pump pressure is still required.
The extension of the fins in the direction of the symmetry axis is preferably continuously tapered radially inwards. The described design provides fluid technology advantages.
Preferably, the tabs at least in the vicinity of the first axial end are twisted slightly helically with respect to the axis of symmetry, so that the connecting line of the end of the respective tab arranged closer to the first axial end and the end of the respective tab arranged closer to the second axial end runs out of plane with respect to the axis of symmetry. The design solution causes a slight vortex of the cooling medium, resulting in an improved heat transfer from the fins to the cooling medium.
Preferably, the tabs at least in the vicinity of the second axial end are non-helically twisted with respect to the axis of symmetry, such that the connecting lines of the end of the respective tab disposed closer to the first axial end and the end of the respective tab disposed closer to the second axial end run parallel to the axis of symmetry. The design reduces the flow resistance when the cooling medium is deflected from the outer cooling channel into the inner cooling channel. Thereby significantly reducing the pressure loss.
Preferably, the fins extend from about 40% to about 70%, especially from about 50% to about 60%, towards the inner tube, as seen from the outer wall. This provides advantages of manufacturing technology on the one hand and optimization between heat transfer on the one hand and flow resistance on the other hand.
It is possible that the above conclusion, i.e. the extent to which the fins extend towards the inner tube, applies to all fins. Alternatively, it is possible that at the first axial end and/or the second axial end a small number of fins extend up to the inner tube, such that the fins fix the inner tube relative to the outer wall. However, in this case the above-mentioned conclusion regarding the extent to which it extends towards the inner tube also applies to the other fins, i.e. the vast majority of the fins.
Preferably, the airfoil has a wave shape at its outer side such that the exact position of the outer side of the airfoil, seen in the circumferential direction around the symmetry axis with a fixed radial distance from the symmetry axis, is a combination of a linear function and a periodic function. The design significantly increases the heat transfer from the airfoil to the cooling medium, but only causes a very small increase in flow resistance.
In this case, the wave shape is preferably also such that, with respect to the respective tab, the position of maximum deflection moves towards the second axial end with increasing spacing from the outer wall. Thereby, heat dissipation can be increased with substantially unchanged flow resistance.
The cooling body, as in the prior art, may be composed of copper, copper alloys or molybdenum. However, contrary to the prior art, it is also possible within the scope of the utility model for the cooling body to consist of aluminum or of an alloy comprising aluminum as a main component (i.e. up to at least 50%). This provides in particular a cost advantage and often also a manufacturing technology advantage.
Preferably, the cooling body is configured as a body manufactured according to an additive manufacturing method, which after additive manufacturing is subjected to a material removal treatment on the outside of its outer wall such that the outer wall has a defined diameter. The described manner and method of manufacturing the cooling body is particularly simple to design.
It is possible that the cooling body can be welded via the outer wall into the inner bearing of the rotating anode. In this case, the cooling body is a member different from the inner bearing. Alternatively, it is possible that the outer wall forms the outer side of the inner bearing of the rotary anode. In this case, the cooling body is identical to the inner bearing.
The object is also achieved by an X-ray device having the features of the embodiments of the utility model. According to the utility model, an X-ray device of the type mentioned at the outset is designed in such a way that: the heat sink is designed according to the utility model. This applies whether the cooling body is a different component from the inner bearing or the same as the inner bearing.
Drawings
The above features, features and advantages, and the manner in which they are accomplished, will become more readily apparent and more readily understood in connection with the following description of the embodiments, which are set forth in more detail in connection with the accompanying drawings. In this case shown in a schematic diagram:
figure 1 shows an X-ray apparatus which,
figure 2 shows a perspective view of the cooling body,
figure 3 shows a perspective view of a section through the cooling body of figure 2,
figure 4 shows a possible external design of the cooling body from the side,
figure 5 shows a section through the inner bearing and the cooling body,
figure 6 shows a top view of the inner bearing and cooling body of figure 5,
figure 7 shows in an expanded view the outer wall of the cooling body seen from radially inside,
figure 8 shows a section along line VIII-VIII in figure 7,
figure 9 shows a perspective view of two tabs,
figure 10 shows a perspective view of two further flaps,
figure 11 shows a cross section of a single fin along the line XI-XI in figure 8,
FIG. 12 shows a flow chart, and
fig. 13 shows another flowchart.
Detailed Description
According to fig. 1, the x-ray device has a rotating anode 1. The rotary anode 1 is arranged in an X-ray tube 2 and is there under vacuum or almost under vacuum. In operation, the rotary anode 1 rotates about the axis of rotation 3 in a manner known per se. For this purpose, the rotary anode 1 is rotatably supported in bearings. The bearing is located within the X-ray tube 2, having an inner bearing 4 and an outer bearing 5. The outer bearing 5 is connected in a rotationally fixed manner to the rotary anode 1. When the rotary anode 1 rotates, the outer bearing 5 rotates together. The inner bearing 4 is fixedly arranged. When the rotary anode 1 rotates, the inner bearing 4 does not rotate together.
In order to rotate the rotary anode 1, a rotor 6 is also provided in the X-ray tube 2, which rotor interacts 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 achieved. The stator 7 is typically arranged outside the X-ray tube 2. The arrangement of the rotor 6 and the stator 7 and their operation are generally known to those skilled in the art. Which is not itself the subject of the present utility model.
The inner bearing 4 is generally hollow. In this case, the inner bearing 4 has a cavity 8. The cavity 8 extends parallel to the axis of rotation 3 of the rotary anode 1. The cavity 8 has a cylindrical shape. The cavity 8 is delimited in the radial direction by the inner bearing 4, more precisely by an inner side 9 of the inner bearing 4, which inner side 9, seen from the inner bearing 4, faces the rotational axis 3 of the rotary anode 1 and surrounds it cylindrically around the rotational axis 3. A cooling body 10 is arranged in the cavity 8. The cooling body 10 has an outer wall 11, see also fig. 2 and 3. The outer wall 11 of the cooling body 10 is welded to the inner side 9 of the cavity 8 via a welded connection 12. The thickness of the welded connection 12 is typically in the range of less than 0.1 mm.
The cooling medium 13 is led through the cooling body 10. Thereby, a part of the heat generated in the rotary anode 1 during operation of the X-ray apparatus is extracted from the rotary anode 1. The cooling medium 13 is normally in a liquid state and in exceptional cases in a gaseous state. The production and design of the cooling body 10 are the actual subject matter of the utility model.
According to fig. 2 and 3, the cooling body 10 has a main section 14. The main section 14 has an outer side 11, which outer side 11 as such surrounds the symmetry axis 15 of the cooling body 10 substantially cylindrically. When the cooling body 10 is welded into the inner bearing 4, the symmetry axis 15 is identical to the rotation axis 3 of the rotary anode 1. The main section 14 extends from a first axial end 16 to a second axial end 17 of the main section 14, seen in the direction of the symmetry axis 15, i.e. in the axial direction x. The second axial end 17 of the main section 14 is the axial end that is most deeply introduced into the cavity 8 when the cooling body 10 is welded into the inner bearing 4.
In order to be able to weld the cooling body 10 well into the inner bearing 4, it is possible, corresponding to the illustration in fig. 4, for the outer wall 11 to have a recess 18 at its outer side. It is thereby particularly possible to introduce solder (not shown) into the recess 18, by means of which solder the cooling body 10 can be soldered into the inner bearing 4. Alternatively to the embodiment with the recess 18, it is possible, corresponding to the illustrations in fig. 5 and 6, to provide a spacer 19, by means of which spacer 19 the cooling body 10 is positioned at a defined distance from the inner bearing 4 before welding, so that liquid solder is drawn into the gap between the cooling body 10 and the inner bearing 4 by capillary action. However, it is only a minor aspect of the present utility model.
According to the description so far, the cooling body 10 is a different element welded into the inner bearing 4 than the inner bearing 4. Alternatively, it is possible to manufacture the cooling body 10 as an integral component of the inner bearing 4. In this case, the inner bearing 4 itself is configured as the cooling body 10. In this case, the outer wall 11 itself forms the outer side of the inner bearing 4 which cooperates with the outer bearing 5.
In the case of a design as a separate element, the cooling body 10 can also have a conical additional section 20 at its second axial end 17 (fig. 1, 5). The opening angle of the additional section 20, i.e. the angle at the tip of the additional section 20, is preferably an obtuse angle, i.e. greater than 90 °. The opening angle may be up to 150 °. The opening angle is generally between 100 ° and 140 °, in particular between 110 ° and 130 °. The conical additional section 20 generally provides advantages of the manufacturing technology when manufacturing the cooling body 10 on the one hand, and on the other hand generally facilitates the introduction of the cooling body 10 into the inner bearing 4.
The principle inventive design of the cooling body 10 is explained in more detail below in connection with fig. 2 and 3.
According to fig. 2 and 3, the main section 14 has an inner tube 21. The inner tube 21 is radially disposed within the outer wall 11. The inner tube 21 extends in the axial direction x from the first axial end 16 to at least the endwise second axial end 17. Thus, the outer wall 11 and the inner tube 21 form an annular outer cooling channel 22 for the cooling medium 13 therebetween. The inner tube 21 forms as such an inner cooling channel 23 for the cooling medium 13. The two cooling channels 22, 23 are connected in communication with each other at the second axial end 17.
If additional sections 20 are present, the connection of the communication of the outer cooling channel 22 with the inner cooling channel 23 can take place via additional sections 24. In this case, it is possible for the inner tube 21 to extend completely up to the second axial end 17. However, this is not mandatory.
According to fig. 2 and 3, see also fig. 7 and 8 in addition, a plurality of fins 24 are provided at the outer wall 11. In fig. 2 only one of the fins 24 is provided with its reference number, and in fig. 3 and 7 only a small number of the fins 24 is provided with its reference number.
The fins 24 extend radially inwardly from the outer wall 11 toward the inner tube 21. The fins 24 form a plurality of rows 25 in the circumferential direction
The rows 25 are spaced apart from each other, seen on, i.e. in a direction about the symmetry axis 15. The rows 25 themselves are shown only in fig. 7, wherein only a single row 25 of fins 24 is shown in fig. 7.
The number of rows 25 may be as desired. The number is generally in the broad range of two digits, for example between 40 and 70, in particular between 45 and 60. Seen alone, the fins 24 of the respective rows 25 are spaced apart from each other in the axial direction x. The fins 24 are also arranged in succession in the axial direction x. The number of fins 24 per row 25 is typically between 10 and 25, for example between 15 and 20.
The length of the fins 24, i.e. the extension in the axial direction x, is typically in the millimeter range of units, for example between 2mm and 5 mm. The thickness of the fins 24, i.e. in the circumferential direction
The extension thereon is typically between 100 μm and 250 μm, for example between about 120 μm and 180 μm.
The fins 24 and their arrangement relative to each other may be designed in different ways and methods. The following describes the design separately. The described embodiments can be implemented individually as required, but also in any combination with one another.
Thus, the extension s of the fins 24 in the axial direction x may, for example, taper continuously radially inward. If, for example, the fins 24 immediately adjacent to the outer wall 11 have an extension s in the axial direction x of, for example, 5mm, the extension s may gradually decrease to, for example, 3mm with increasing spacing from the outer wall 11. Corresponding to the illustration in fig. 8, the tapering may for example be in the manner of a symmetrical or asymmetrical trapezoid. Other shapes are possible, for example according to the way of a circular segment.
Furthermore, according to fig. 7 (see also fig. 9 in addition), the fins 24 near at least the first axial end 16 may be twisted slightly helically with respect to the symmetry axis 15. The connecting line 26 of the end of the respective tab 24 that is arranged closer to the first axial end 16 and the end of the respective tab 24 that is arranged closer to the second axial end 17 thus extends out of plane with respect to the axis of symmetry 15. Thus, in the unfolded view according to fig. 7, the corresponding wing 24 forms an angle α with the projection of the symmetry axis 15 on the position of the corresponding wing 24. The angle alpha has the same sign for the corresponding tab 24 all the time. I.e., the tab 24 is either all twisted left or all twisted right, but not one twist left and one twist right. Furthermore, the angles α are also generally uniform in magnitude. For example, the angle may be between 2 ° and 5 °, in particular at least 3 °.
In contrast, at least for the fins 24 in the vicinity of the second axial end 17, it is advantageous, corresponding to the illustration in fig. 7 (see additionally fig. 10), that said fins 24 are non-helically twisted with respect to the symmetry axis 15, so that the connecting lines 27 of the ends of the respective fins 24, which are arranged closer to the first axial end 16, and the ends of the respective fins 24, which are arranged closer to the second axial end 17, extend parallel to the symmetry axis 15.
These two cases are not mutually exclusive. If, purely by way of example, the rows 25 each have 20 fins 24, for example, the last fin 24 of the respective row 25, i.e. the fin 24 immediately adjacent to the second axial end 17, may be oriented parallel to the symmetry axis 15, while the other fins 24 of the respective row 25 are slightly helically twisted.
According to the illustrations in fig. 3 and 8, the fins 24 extend toward the inner tube 21, but are spaced from the inner tube 21, as seen from the outer wall 11. Corresponding to the illustration in fig. 8, if the spacing between the outer wall 11 and the inner tube 21 is denoted by a and the extension of the fins 24 in the radial direction (i.e. towards the inner tube 21) is denoted by b, the quotient between the extension b of the fins 24 in the radial direction and the spacing a between the outer wall 11 and the inner tube 21 is preferably between about 0.40 and about 0.70, preferably between 0.50 and 0.60.
The conclusion may be applicable to all of the fins 24. However, it is possible that there are a small number of fins 24 for which the conclusion is not applicable. According to fig. 3, the tab 24 is at the first axial end 16 and/or the second axial end 17. The fins 24 extend up to the inner tube 21. Thus, the tabs 24 fix the inner tube 21 relative to the outer wall 11. The number of fins 24 extending up to the inner tube 21 is preferably as low as possible. The number (of each axial end 16, 17) is typically three or four. The following conclusions preferably also apply to the other fins 24: the quotient between the extension b and the distance a in the radial direction is between about 0.40 and about 0.70, preferably between 0.50 and 0.60.
As can be seen in particular from fig. 9 and 10, the wing 24 has a wave-like shape at its outer side. Thus, with a fixed radial spacing from the symmetry axis 15 (e.g., radial spacing corresponding to the cross-section of fig. 11), in the circumferential direction
As seen, the precise location of the outside of the airfoil 24 is a combination of a linear function and a periodic function. The linear function corresponds to the pitch of the tab 24, as it has been described above in connection with a slightly helical twist. For the fins 24 near the first axial end 16, the linear function is non-zero, which may be zero for the fins 24 near the second axial end 17. The periodic function reflects the waveform shape itself. The wavelength or period of the waveform shape is typically at about 50 μm and the amplitude of the wave is at about 25 μm. The waveform shape typically oscillates sinusoidally or S-like, i.e. without bends or the like.
As can also be seen from fig. 9 and 10, the wave shape is such that, with respect to the respective tab 24, the position of maximum deflection moves towards the second axial end 17 with increasing spacing from the outer wall 11. For example, if it is to be circumferentially
Upper toolThe positions adjoining each other with the greatest deflection are connected to each other in the radial direction (i.e. towards the symmetry axis 15), a connection line 28 results (see fig. 8 for a single airfoil 24). The connecting line 28 does not extend purely radially, i.e. towards the symmetry axis 15, but has an axial component in addition to its radial component. The axial component is directed from the first axial end 16 to the second axial end 17.
The inclination of the wave form can in particular be determined such that the angle β of the connecting line 28 in the radial-axial plane with respect to the axial direction x is approximately 75 ° to 80 °.
Copper, copper alloys (e.g., copper-chromium-zirconium) and molybdenum, in particular, are contemplated as materials for the cooling body 10. However, in contrast to prior art cooling bodies (where this is imperatively required), the cooling body 10 of the present utility model may alternatively be composed of aluminum or an alloy containing aluminum as a main component. If at least 50% by weight of the alloy is composed of aluminum, the alloy contains aluminum as a major constituent.
The cooling body 10 is preferably manufactured according to an additive manufacturing method. In principle, therefore, the cooling body 10 is formed as a body produced according to an additive manufacturing method. Additive manufacturing methods are generally known to those skilled in the art, the keyword "3D printer". One example of a suitable additive manufacturing method is so-called electrochemical additive manufacturing. Another example is so-called powder bed fusion.
In additive manufacturing methods, dimensional accuracy and manufacturing accuracy are often limited. Thus, with the aid of the additive manufacturing method, the cooling body 10 can only be manufactured with correspondingly limited precision. However, in particular radially to the axis of symmetry 15, in order to be able to ensure a defined diameter of the cooling body 10, it is therefore possible, for example, to first produce the cooling body 10 itself according to the additive manufacturing method in step S1, corresponding to the illustration in fig. 12. The fact that the additive manufacturing method is involved is indicated by "+" in step S1 ("+" because of the addition of material). Then, i.e. after additive manufacturing of the cooling body 10, the cooling body 10 is treated in a material-removing manner on the outside of its outer wall 11 in step S2. The fact that this relates to the treatment in the material removal manner is indicated by "-" in step S2 ("-" because the material is removed). Material removal processes, such as milling or turning, can be performed with significantly greater precision. It is thereby possible to perform step S2 such that after performing step S2, the outer wall 11 has precisely a defined diameter.
The internal structure of the cooling body 10, i.e. the inner tube 21 and the fins 24, is manufactured together during step S1. In some cases, the manufacturing accuracy of the additive manufacturing method may be sufficient for this. However, it is also possible here to require a post-treatment in which material must be removed. In this case, this can be done, for example, as explained below in connection with fig. 13.
In fig. 13, step S1 is replaced by steps S11 to S13.
In step S11, a section of the cooling body 10 is manufactured (only) according to the additive manufacturing method. The sections may extend, for example, in the axial direction x, as seen in the grid dimension in which the fins 24 are arranged in the axial direction x. If, for example, the fins 24 each extend in the axial direction x over 5mm and the distance from fin 24 to fin 24 is 2mm in the axial direction x, the sections may extend for example over 5mm+2 mm=7 mm.
In step S12, the internal structure of the section manufactured in step S11 is post-treated, i.e. the corresponding sections of the fins 24 and the inner tube 21 are post-treated. The post-treatment may in particular be material removal.
It is possible that the material removal post-treatment of step S12 is a conventional material removal post-treatment such as grinding (lapping) or polishing (honing), similar to step S2. Alternatively, it is possible to relate to post-treatments, in particular so-called electropolishing methods, in which the material is removed electrochemically and in a method, as is known, for example, from WO 2018/102 845 A1.
In step S13 it is checked whether all segments have been manufactured. If this is not the case, return is made to step S11 and the next section is first additively manufactured and then the internal structure thereof is subjected to a material removal post-treatment. In contrast, if all the sections have been manufactured, a transition is made to step S2, in which the outside of the outer wall 11 is subjected to a material removal process.
In particular, due to the additive manufacturing of the cooling body 10, it is possible for the cooling body 10 to be identical to the inner bearing 4 or to be an integral part of the inner bearing 4.
If the cooling body 10 is a separate element welded into the inner bearing 4, the cooling body 10 generally has a relatively small size. For example, the diameter is typically in the range between 12mm and 25mm, for example at about 16mm. The length of the main section 14, i.e. the distance between the first axial end 16 and the second axial end 17, is typically in the range between 70mm and 120mm, for example about 80mm. If the cooling body 10 is identical to the inner bearing 4 or is an integral part of the inner bearing 4, the cooling body 10 has a larger size.
At the first axial end 16, the outer cooling channel 22 may transition into a tubular connecting section (not shown in this figure). The connection of the outer cooling channel 22 into the flow circuit of the cooling medium 13 is thereby achieved in a simple manner. However, other approaches are also possible. The inner cooling channel 23 has been constructed in a tubular manner so that the inner cooling channel 23 can be easily connected into the flow circuit.
The utility model thus relates generally to the fact that:
the cooling body 10 for the inner bearing 4 of the rotary anode 1 of an X-ray device has a main section 14, which main section 14 extends from a first axial end 16 to a second axial end 17, seen in the axial direction X of the cooling body 10. The main section 14 has an outer wall 11 on the radially outer side, which substantially surrounds the axis of symmetry 15 in a cylindrical manner, and has an inner tube 21 in the outer wall 11 in the radial direction, which inner tube 21 extends in the axial direction x from the first axial end 16 and to at least the nearest second axial end 17. The outer wall 11 and the inner tube 21 form an annular outer cooling channel 22 for the cooling medium 13 therebetween, which outer cooling channel 22 is connected at the second axial end 17 in communication with an inner cooling channel 23 for the cooling medium 13 formed by the inner tube 21. At the outer wall 11 a plurality of radially inwardly extending fins 24 are provided. The fins 24 form rows 25, the rows 25 being circumferentially spaced
Spaced apart from one another. Seen individually, the fins 24 of the respective row 25 are spaced apart from each other in the axial direction x and are arranged in sequence. />
The present utility model has several advantages. Good thermal contact is achieved by the surface contact between the inner side 9 of the inner bearing 4 and the outer side 11 of the cooling body 10, so that a low thermal resistance is achieved in the transition from the inner bearing 4 to the cooling body 10. The diameter D of the cooling body 10 can be matched to the diameter of the cavity 8 with high accuracy (0.1 mm or better). No special welding tools are required. The welding process itself is reliable. The size of the scrap in welding the cooling body 10 into the inner bearing 4 can be reduced compared to the prior art. Furthermore, the flow resistance of the cooling medium 13 is kept low so that the pump for conveying the cooling medium 13 can be dimensioned smaller than in the prior art, at comparable volumetric flows. Due to the large contact surface provided by the fins 24, a very good heat transfer into the cooling medium 13 is ensured. The flow resistance can be optimized by further structuring of the internal structure of the cooling body 10.
While the details of the present utility model have been illustrated and described in detail by the preferred embodiments, the present utility model is not limited by the examples disclosed and other variations can be derived therefrom by those skilled in the art without departing from the scope of the present utility model.
Claims (16)
1. A cooling body for an inner bearing (4) of a rotating anode (1) of an X-ray device,
wherein the cooling body has a main section (14), which main section (14) extends from a first axial end (16) to a second axial end (17) as seen in the direction of the symmetry axis (15) of the cooling body,
wherein the main section (14) has an outer wall (11) on the radially outer side, which surrounds the axis of symmetry (15) in a cylindrical manner,
it is characterized in that the method comprises the steps of,
-the main section (14) has an inner tube (21) radially inside the outer wall (11), the inner tube (21) extending in the direction of the symmetry axis (15) from the first axial end (16) and up to at least the second axial end (17) so that an annular outer cooling channel (22) for a liquid or gaseous cooling medium (13) is formed between the outer wall (11) and the inner tube (21), and the outer cooling channel (22) is connected at the second axial end (17) in communication with an inner cooling channel (23) for the cooling medium (13) formed by the inner tube (21),
-a plurality of fins (24) are provided at the outer wall (11), the fins (24) extending radially inwards from the outer wall (11) towards the inner tube (21),
-the fins (24) form a plurality of rows (25) in a circumferential direction around the symmetry axis (15)
The rows (25) are spaced apart from each other, as seen from above, and
-seen individually, the fins (24) of the respective row (25) are spaced apart from each other seen in the direction of the symmetry axis (15) and are arranged in sequence seen in the direction of the symmetry axis (15).
2. The cooling body according to claim 1,
it is characterized in that the method comprises the steps of,
the extension(s) of the fins (24) in the direction of the symmetry axis (15) tapers continuously radially inwards.
3. The cooling body according to claim 1 or 2,
it is characterized in that the method comprises the steps of,
the tabs (24) at least in the vicinity of the first axial end (16) are twisted slightly helically with respect to the symmetry axis (15) so that the connecting line of the end of the respective tab (24) arranged closer to the first axial end (16) and the end of the respective tab (24) arranged closer to the second axial end (17) runs out of plane with respect to the symmetry axis (15).
4. The cooling body according to claim 1 or 2,
it is characterized in that the method comprises the steps of,
-said fins (24) at least in the vicinity of said second axial end (17) are non-helically twisted with respect to said symmetry axis (15) such that the connecting line of the end of the respective fin (24) arranged closer to said first axial end (16) and the end of the respective fin (24) arranged closer to said second axial end (17) extends parallel to said symmetry axis (15).
5. The cooling body according to claim 1 or 2,
it is characterized in that the method comprises the steps of,
the fins (24) extend from 40% to 70% towards the inner tube (21) as seen from the outer wall (11).
6. The cooling body according to claim 1 or 2,
it is characterized in that the method comprises the steps of,
the fins (24) extend 50% to 60% towards the inner tube (21) as seen from the outer wall (11).
7. The cooling body according to claim 1 or 2,
it is characterized in that the method comprises the steps of,
at the first axial end (16) and/or at the second axial end (17), a small number of fins (24) extend up to the inner tube (21), such that the fins (24) fix the inner tube (21) relative to the outer wall (11), and other fins (24) extend 40% to 70% towards the inner tube (21) as seen from the outer wall (11).
8. The cooling body according to claim 7,
it is characterized in that the method comprises the steps of,
the other fins (24) extend 50% to 60% towards the inner tube (21) seen from the outer wall (11).
9. The cooling body according to claim 1 or 2,
it is characterized in that the method comprises the steps of,
the fins (24) have a wave shape at their outer side such that in the circumferential direction about the axis of symmetry (15)
As seen above, the precise position of the outside of the airfoil (24) is a combination of a linear function and a periodic function, with a fixed radial spacing from the axis of symmetry (15).
10. The cooling body according to claim 9,
it is characterized in that the method comprises the steps of,
the wave shape is such that, in relation to the respective tab (24), the position of maximum deflection moves towards the second axial end (17) with increasing distance from the outer wall (11).
11. The cooling body according to claim 1 or 2,
it is characterized in that the method comprises the steps of,
the cooling body is composed of aluminum or an alloy containing aluminum as a main component.
12. The cooling body according to claim 1 or 2,
it is characterized in that the method comprises the steps of,
the cooling body is configured as a body manufactured according to an additive manufacturing method, after which the cooling body is subjected to a material removal treatment on the outside of its outer wall (11) such that the outer wall (11) has a defined diameter.
13. The cooling body according to claim 1 or 2,
it is characterized in that the method comprises the steps of,
the cooling body can be welded into the inner bearing (4) of the rotary anode (1) via the outer wall (11).
14. The cooling body according to claim 1 or 2,
it is characterized in that the method comprises the steps of,
the outer wall (11) forms the outer side of the inner bearing (4) of the rotary anode (1).
15. An X-ray apparatus, comprising a first radiation source,
wherein the X-ray device has a rotating anode (1),
wherein the rotary anode (1) is arranged in an X-ray tube (2) and is rotatably supported therein in bearings such that the rotary anode (1) can rotate about a rotation axis (3),
wherein the bearing has an inner bearing (4) and an outer bearing (5),
wherein the outer bearing (5) is connected in a rotationally fixed manner to the rotary anode (1) such that the outer bearing (5) rotates together when the rotary anode (1) rotates,
wherein the inner bearing (4) is fixed such that the inner bearing (4) does not rotate together when the rotary anode (1) rotates,
wherein the inner bearing (4) has an inner side (9) which surrounds the rotation axis (3) of the rotary anode (1) cylindrically, said inner side (9) radially delimiting a cylindrical cavity (8) which extends parallel to the rotation axis (3),
it is characterized in that the method comprises the steps of,
the cooling body (10) according to claim 13 is arranged in the cavity (8), and an outer wall (11) of the cooling body (10) is welded to an inner side (9) of the cavity (8) via a welded connection (12).
16. An X-ray apparatus, comprising a first radiation source,
wherein the X-ray device has a rotating anode (1),
wherein the rotary anode (1) is arranged in an X-ray tube (2) and is rotatably supported therein in bearings such that the rotary anode (1) can rotate about a rotation axis (3),
wherein the bearing has an inner bearing (4) and an outer bearing (5),
wherein the outer bearing (5) is connected in a rotationally fixed manner to the rotary anode (1) such that the outer bearing (5) rotates together when the rotary anode (1) rotates,
wherein the inner bearing (4) is fixed such that the inner bearing (4) does not rotate together when the rotary anode (1) rotates,
it is characterized in that the method comprises the steps of,
the inner bearing (4) is designed as a cooling body (10) according to claim 14.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP21195757.6 | 2021-09-09 | ||
| EP21195757 | 2021-09-09 |
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| Publication Number | Publication Date |
|---|---|
| CN218996647U true CN218996647U (en) | 2023-05-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222384641.4U Active CN218996647U (en) | 2021-09-09 | 2022-09-08 | Cooling body and X-ray device |
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| Country | Link |
|---|---|
| CN (1) | CN218996647U (en) |
| DE (1) | DE202022104389U1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117810049A (en) * | 2024-02-20 | 2024-04-02 | 昆山医源医疗技术有限公司 | X-ray tube and anode assembly and tube core assembly for same |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ES2879297T3 (en) | 2016-12-09 | 2021-11-22 | Rena Tech Austria Gmbh | Electropolishing and electrolyte method for the same |
| EP3511972A1 (en) | 2018-01-11 | 2019-07-17 | Siemens Healthcare GmbH | Efficient heat dissipation over sliding bearing for a rotary anode |
-
2022
- 2022-08-02 DE DE202022104389.2U patent/DE202022104389U1/en active Active
- 2022-09-08 CN CN202222384641.4U patent/CN218996647U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117810049A (en) * | 2024-02-20 | 2024-04-02 | 昆山医源医疗技术有限公司 | X-ray tube and anode assembly and tube core assembly for same |
| CN117810049B (en) * | 2024-02-20 | 2024-07-30 | 昆山医源医疗技术有限公司 | X-ray tube and anode assembly and tube core assembly for same |
Also Published As
| Publication number | Publication date |
|---|---|
| DE202022104389U1 (en) | 2022-08-23 |
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