JP3916770B2 - Rotating anode X-ray tube - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a rotary anode X-ray tube capable of efficiently releasing high heat generated when X-rays are generated.
[0002]
[Prior art]
Conventional rotary anode X-ray tubes include those shown in FIG. In the rotary anode X-ray tube 50, X-rays 53 are generated from the target 52 when the electron beam 51 is irradiated from a cathode (not shown) toward the target 52 in a vacuum. At the same time, most of the kinetic energy of the electron beam 51 is changed to heat, and high heat is generated in the target 52. The heat of the target 52 is directly released from the target 52 and the rotor 54 to the outside of the vacuum tube 55 by radiation, and is transmitted to the bearing housing 58 through the shaft 56 and the bearing 57 by heat conduction and goes out.
[0003]
[Problems to be solved by the invention]
However, in the conventional rotary anode X-ray tube 50, the heat of the shaft 56 is transmitted from the shaft 56 to the bearing housing 58 only through a very small surface where the raceway surface of the bearing 57 and the ball 59 are in contact with each other. There was a problem that the heat of the shaft 56 did not escape efficiently.
[0004]
As described above, since the heat of the shaft 56 does not escape efficiently, the cooling of the target 52 connected to the shaft 56 becomes insufficient, and the high output of the X-ray 53 and the continuous operation of the X-ray beam become impossible. There was a problem.
[0005]
In addition, since the heat of the shaft 56 does not escape efficiently, the shaft 56 and the bearing 57 in contact with the shaft 56 also become high temperature, the performance of the solid lubricant in the bearing 57 is impaired, and the life of the bearing 57 is shortened. There was a problem that it became extremely short.
[0006]
Accordingly, an object of the present invention is to provide a rotating anode X-ray tube that can efficiently release high heat generated when X-rays are generated, and can achieve high output, long-time continuous operation, and long bearing life.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, a rotating anode X-ray tube according to the first aspect of the present invention includes a supported member connected to a target, a supporting member that supports the supported member via a rolling bearing, the supported member, and the above An accommodating portion formed between the supporting member and a liquid metal which is accommodated in the accommodating portion and does not substantially evaporate even in a vacuum, and the accommodating portion is substantially in the center in the axial direction between the plurality of rolling bearings. The housing portion is characterized by having a tapered surface having the largest diameter in the axial direction and having a diameter that decreases toward the end in the axial direction.
[0008]
According to the rotary anode X-ray tube of the first aspect of the invention, the liquid metal is accommodated in the accommodating portion formed between the supported member and the support member. Therefore, the heat transmitted from the target to the supported member is efficiently transmitted to the support member via the liquid metal and released to the outside. The liquid metal also functions as a coolant. Therefore, the temperature rise of the target, the supported member, and the bearing is prevented, and the output of the X-ray tube can be increased, the operation can be continued for a long time, and the life of the bearing can be extended.
[0009]
According to the rotary anode X-ray tube of the first aspect of the invention, the accommodating portion has the largest diameter in the center in the axial direction and has a tapered surface that decreases in diameter toward the end in the axial direction. ing. Therefore, the liquid metal is easily filled in the accommodating portion without a gap. Further, when the shaft is rotated, the centrifugal force acts on the liquid metal, so that the liquid metal is collected at the center in the axial direction having the largest diameter of the accommodating portion, so that the liquid metal can be prevented from leaking from the accommodating portion.
[0010]
The rotary anode X-ray tube according to the invention of claim 2 is the rotary anode X-ray tube according to claim 1, wherein the liquid metal is Ga or Ga alloy, and the accommodating portion in contact with the Ga or Ga alloy is It is characterized by being made of a corrosion-resistant metal or a corrosion-resistant ceramic having corrosion resistance with respect to the Ga or the Ga alloy.
[0011]
In the rotary anode X-ray tube according to the invention of claim 2, the liquid metal is Ga or a Ga alloy, and the accommodating portion is made of a corrosion resistant metal or a corrosion resistant ceramic having corrosion resistance to the Ga or the Ga alloy. Yes. Therefore, the housing portion is not corroded by Ga or Ga alloy.
[0012]
A rotary anode X-ray tube according to a third aspect of the present invention is the rotary anode X-ray tube according to the first aspect, wherein the liquid metal is Ga or a Ga alloy, and the accommodating portion in contact with the Ga or the Ga alloy is TiN. It is characterized by being made of stainless steel or tool steel coated with.
[0013]
In the rotary anode X-ray tube according to the third aspect of the invention, since the housing portion is made of stainless steel or tool steel coated with TiN, the housing portion is not corroded by Ga or Ga alloy. Moreover, since the said accommodating part coat | covers stainless steel or tool steel with TiN, it can manufacture cheaply rather than making the whole with the corrosion-resistant material with respect to Ga or Ga alloy.
[0014]
A rotary anode X-ray tube according to a fourth aspect of the present invention is the rotary anode X-ray tube according to any one of the first to third aspects, further comprising an injection hole for injecting the liquid metal into the housing portion. It is characterized by being.
[0015]
In the rotary anode X-ray tube according to the fourth aspect of the present invention, the injection hole for injecting the liquid metal into the accommodating portion is provided, so that the injection of the liquid metal into the accommodating portion is facilitated. Even if it is consumed during use, it can be easily replenished.
[0016]
According to a fifth aspect of the present invention, there is provided the rotary anode X-ray tube according to the fourth aspect, wherein the injection hole is threaded and the injection hole is closed with a screw plug. It is a feature.
[0017]
In the rotary anode X-ray tube according to the fifth aspect of the present invention, since the injection hole is threaded and the injection hole is closed with a screw plug, the liquid metal does not leak from the injection hole. .
[0018]
A rotary anode X-ray tube according to a sixth aspect of the present invention is the rotary anode X-ray tube according to any one of the first to fifth aspects, wherein the supported member and the support member are arranged on the outer side in the axial direction than the housing portion. A rotating anode X-ray tube characterized in that the gap between them is 0.2 mm or less.
[0019]
In the rotary anode X-ray tube according to the sixth aspect of the present invention, since the gap between the supported member and the support member on the outer side in the axial direction of the housing portion is 0.2 mm or less, the liquid metal flows from the housing portion. Leakage is prevented. This was confirmed by experiments.
[0020]
A rotary anode X-ray tube according to a seventh aspect of the present invention is the rotary anode X-ray tube according to the sixth aspect, wherein the pumping groove for pushing back the liquid metal in the gap between the supported member and the support member to the accommodating portion. Is formed on the supported member or the supporting member.
[0021]
In the rotary anode X-ray tube according to the seventh aspect of the present invention, the pumping groove formed in the supported member or the supporting member contains the liquid metal in the gap between the supported member and the supporting member. Push back to. Therefore, the liquid metal is prevented from leaking from the housing portion.
[0022]
The rotary anode X-ray tube according to an eighth aspect of the present invention is the rotary anode X-ray tube according to the seventh aspect, wherein a labyrinth groove for storing a liquid metal is formed adjacent to the outside of the pumping groove. It is a feature.
[0023]
In the rotary anode X-ray tube according to the eighth aspect of the present invention, even if the liquid metal leaks out of the housing portion and further leaks out of the pumping groove, it is adjacent to the outside of the pumping groove. The labyrinth groove thus formed captures the liquid metal.
[0024]
A rotary anode X-ray tube according to a ninth aspect of the present invention is the rotary anode X-ray tube according to the seventh or eighth aspect, wherein the groove angle of the pumping groove is 10 to about a plane perpendicular to the axial direction of the supported member. It is characterized by 20 degrees.
[0025]
In the rotary anode X-ray tube according to the ninth aspect of the invention, since the groove angle of the pumping groove is 10 to 20 degrees with respect to a plane perpendicular to the axial direction of the supported member, the supported member rotates. A pumping force that pushes the liquid metal back into the housing portion when it is being held is secured by the pumping groove, and leakage of the liquid metal from the pumping groove when the supported member is stationary is suppressed. If the groove angle of the pumping groove exceeds 20 degrees, the pumping force is increased and the liquid metal is pushed back to the receiving part during operation. However, the groove length is shortened and the liquid metal passes through the pumping groove when stationary. Leaks to the outside. On the other hand, if the groove angle is less than 10 degrees, the groove length becomes long and it becomes difficult for the liquid metal to leak to the outside when stationary, but the pumping force is reduced during operation, and the liquid metal is pushed back to the accommodating portion. Is weakened. This was confirmed by experiments.
[0026]
[0027]
[0028]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in detail with reference to the illustrated embodiments.
[0029]
FIG. 1 is a sectional view of a rotary anode X-ray tube 1 according to an embodiment of the present invention. The rotary anode X-ray tube 1 includes a stepped cylindrical vacuum tube 2, a disk-shaped target 3, a shaft 6 as a supported member connected to the center of the target 3, and the shaft 6 A shaft 6 and a cylindrical rotor 5 mounted coaxially are provided. Further, the rotary anode X-ray tube 1 includes a cylindrical bearing housing 8 and ball bearings 7 and 7 as support members, and supports the shaft 6 via the ball bearings 7 and 7. The bearing housing 8 includes a portion 8a and a portion 8b. The portion 8a is made of stainless steel, and the portion 8b is corrosion-resistant such as Mo, Mo alloy, Ta, or W that is corrosion resistant to Ga or Ga alloy. It is made of metal or ceramics. Further, the shaft 6 is made of corrosion-resistant metal such as Mo, Mo alloy, Ta, W or ceramics having corrosion resistance to Ga or Ga alloy, and has deep grooves 4 and 4 as raceways in the circumferential direction. . Further, a housing portion 10 is formed by the central portion of the shaft 6 and the inner surface of the portion 8 b of the bearing housing 8. The housing portion 10 has a taper surface 11, 11 having a diameter in the central portion in the axial direction that is the largest and decreases in diameter toward the end in the axial direction, and has a so-called abacus ball shape. The clearance between the outer shaft 6 and the bearing housing 8 of the housing portion 10 is set to 0.2 mm or less. A threaded injection hole 13 is communicated with an axially central upper portion of the accommodating portion 10, and a screw plug 12 is screwed into the injection hole 13. The accommodating portion 10 accommodates Ga or Ga alloy, which is a liquid metal that does not substantially evaporate even in a vacuum. The shaft 6 and the portion 8b of the bearing housing 8 that form the housing portion 10 are corroded because they are made of corrosion-resistant metal or ceramics such as Mo, Mo alloy, Ta, and W that are corrosion resistant to Ga or Ga alloy. There is nothing.
[0030]
On the other hand, spiral pumping grooves 14 and 14 are provided on the outer shafts 6 at both ends of the accommodating portion 10. The pumping groove 14 has a function of pushing back Ga in the gap between the shaft 6 and the bearing housing 8 to the storage unit 10. About the said pumping groove | channel 14, the groove | channel angle with respect to the plane perpendicular | vertical to the axial direction of the shaft 6 is set to 10 thru | or 20 degree | times. Further, a labyrinth groove 15 is provided on the shaft 6 outside the pumping groove 14.
[0031]
In the rotary anode X-ray tube 1 configured as described above, when a high voltage is applied between a cathode portion (not shown) and the target 3 as an anode in a vacuum tube 2 in a vacuum, an electron beam 16 is generated at the cathode portion. The electron beam 16 collides with the target 3. At this time, X-rays 17 are generated from the target 3. At the same time, high heat is generated in the target 3. Part of the heat generated in the target 3 is directly released from the target 3 and the rotor 5 to the outside of the vacuum tube 2 by heat radiation. The other part of the heat generated in the target 3 is further transmitted to the shaft 6 via the bearings 7 and 7 and also to the bearing housing 8 via the liquid metal Ga or Ga alloy in the accommodating portion 10.
[0032]
Since the area of the contact surface between the shaft 6 and the balls of the bearings 7 and 7 is extremely small, the amount of heat transmitted through the bearings 7 and 7 is extremely small, but the bearing is obtained via the liquid metal Ga or Ga alloy in the housing portion 10. As for the heat transferred to the housing 8, the shaft 6 and the Ga or Ga alloy, and the area where the Ga or Ga alloy and the bearing housing 8 are in direct contact are large, and the heat transfer coefficient of the Ga or Ga alloy is large. Good heat transfer efficiency. Furthermore, Ga or Ga alloy also acts as a coolant. Therefore, heat can be effectively released from the target 3 to the outside, and the target 3 can be cooled. For this reason, the temperature increase of the target 3, the shaft 6 and the bearings 7 and 7 is prevented, the output of the X-ray tube can be increased, the continuous operation can be performed for a long time, and the life of the bearing can be extended.
[0033]
Further, the shaft 6 and the portion 8b of the bearing housing 8 that form the housing portion 10 are made of corrosion-resistant metal such as Mo, Mo alloy, Ta, or W or ceramics that are corrosion resistant to Ga or Ga alloy. The corrosion of the housing part 10 can be prevented.
[0034]
Since the screw-injection injection hole 13 communicates with the axially central upper portion of the housing part 10, it is easy to inject Ga or Ga alloy into the housing part 10. In particular, even if Ga or Ga alloy is consumed during use, they can be replenished easily. Further, since the injection hole 13 is blocked by the screw plug 12, Ga or Ga alloy can be prevented from leaking from the injection hole 13.
[0035]
Further, the housing portion 10 has a so-called abacus ball shape, and has taper surfaces 11 and 11 that have the largest diameter in the central portion in the axial direction and become smaller in diameter toward the end in the axial direction. is doing. Therefore, due to such a shape of the accommodating portion 10, Ga or Ga alloy is easily filled without gaps without leaving bubbles or the like in the accommodating portion 10.
[0036]
Moreover, Ga or Ga alloy in the said accommodating part 10 does not leak outside as follows.
[0037]
FIG. 2 shows the relationship between the gap (mm) between the shaft 6 and the bearing housing 8 and the amount of Ga leakage (g / h). From FIG. 2, it can be seen that when the gap between the shaft 6 and the bearing housing 8 is 0.2 mm or less, Ga in the housing portion 10 does not leak out. In this embodiment, since the gap is set to 0.2 mm or less, leakage of Ga or Ga alloy is prevented.
[0038]
The housing part 10 has a shape of an abacus ball, and has tapered surfaces 11 and 11 that have the largest diameter in the central part in the axial direction and become smaller in diameter toward the end in the axial direction. . For this reason, when Ga in contact with the shaft 6 starts to rotate with the rotation of the shaft 6, the centrifugal force acts on Ga or Ga alloy, and the centrifugal force pushes the Ga to the central portion having the largest diameter of the accommodating portion 10. Therefore, it becomes difficult for Ga in the said accommodating part 10 to leak out from both ends.
[0039]
In addition, the pumping grooves 14 and 14 located on both outer sides of the housing portion have Ga or Ga alloy when the shaft 6 rotates even if Ga or Ga alloy exists in the gap between the shaft 6 and the bearing housing 8. The alloy is pushed toward the housing part 10. Therefore, Ga or Ga alloy does not leak out from both ends.
[0040]
As described above, when the pumping groove 14 is provided in the shaft 6, even if the clearance between the shaft 6 and the bearing housing 8 exceeds 0.2 mm, the pumping force of the pumping groove 14 causes leakage when the shaft 6 rotates. Since Ga or Ga alloy is pushed back to the housing part 10, Ga or Ga alloy does not leak from the housing part 10 or is difficult to leak.
[0041]
When the rotation of the shaft 6 stops, if the pumping groove is short, Ga or Ga alloy may leak to the outside through the pumping groove. FIG. 6 shows the relationship between the groove angle α and the dimensionless groove length L and the relationship between the groove angle α and the dimensionless pumping force M. As shown in FIG. 5, the groove angle α is an angle of the groove with respect to a plane perpendicular to the axial direction of the shaft 6, and the dimensionless groove length L is between the axial length A of the shaft. The groove length is divided by the length A. 6 that the dimensionless groove length L becomes smaller as the groove angle α is larger. Therefore, in order to increase the leakage resistance by increasing the groove length, the groove angle α may be reduced. However, the pumping force takes a maximum value at a groove angle α of about 35 degrees. If the groove angle α is decreased from 35 degrees, the pumping force rapidly decreases as shown in FIG. As can be seen from FIG. 6, when the groove angle α is 10 to 20 degrees, the pumping force of about 50 to 80% of the maximum value is obtained, and the leakage amount of Ga or Ga alloy is small. That is, when the groove angle α is 10 to 20 degrees, a sufficiently large pumping force can be obtained, and the leakage amount of the liquid metal Ga or Ga alloy can be suppressed. This was derived from the following experimental results. When the groove angle is less than 10 degrees, the groove length becomes long, and it becomes difficult for Ga or Ga alloy to leak to the outside at rest. The push-back function has weakened. When the groove angle of the pumping groove is more than 20 degrees and not more than about 35 degrees, the pumping force is increased and the Ga or Ga alloy is pushed back to the housing portion during operation. Ga or Ga alloy leaked to the outside. When the groove angle exceeded 35 degrees, the pumping force was weakened, and at the same time, the leakage amount of Ga or Ga alloy to the outside increased. In this way, when the groove angle α is set to 10 to 20 degrees, a sufficiently large pumping force can be obtained, and the leakage amount of the liquid metal Ga or Ga alloy can be suppressed.
[0042]
On the other hand, labyrinth grooves 15, 15 are provided outside the pumping grooves 14, 14. Therefore, for example, even if Ga or Ga alloy leaks outside the pumping grooves 14 and 14 while the shaft 6 is stationary, the Ga or Ga alloy is trapped in the labyrinth groove and Ga or Ga alloy leaks to the outside. It can prevent getting out.
[0043]
In this embodiment, the shaft 6 as the supported member is connected to the target 3 and the bearing housing 8 as the supporting member is fixed to the vacuum tube 2, but a sleeve as a supported member (not shown) is used as the target. A shaft as a support member that is connected and fitted into the sleeve may be fixed to the vacuum tube.
[0044]
Further, in the present embodiment, the shaft 6 and the portion 8b of the bearing housing 8 forming the housing portion 10 are made of corrosion-resistant metal or ceramics such as Mo, Mo alloy, Ta, or W, which is corrosion resistant to Ga or Ga alloy. As shown in FIG. 3, the shaft 76 and the portion 78b of the bearing housing 78 are made of stainless steel or tool steel such as SKH4, and the portion 78b of the bearing housing 78 and the shaft forming the housing portion 10 are formed. The TiN film 70 may be coated on the 76 portion 76a. Since FIG. 3 is the same as FIG. 1 except for the above-described members, the same members are denoted by the same reference numerals and description thereof is omitted. As described above, when the tool steel such as stainless steel or SKH4 is coated with the TiN film 70, the entire bearing housing can be manufactured at a lower cost than the above-described corrosion-resistant metal or ceramic.
[0045]
In the present embodiment, the pumping grooves 14 are provided on the shaft 6 side, but may be provided on the bearing housing 8 side.
[0046]
【The invention's effect】
As is clear from the above description, the rotary anode X-ray tube according to the first aspect of the present invention has the target because the liquid metal is accommodated in the accommodating portion formed between the supported member and the supporting member. Thus, the heat transferred to the supported member can be efficiently transferred to the supporting member through the liquid metal. Moreover, a liquid metal can be functioned also as a coolant. For this reason, the temperature rise of the target, the supported member, and the bearing can be prevented, and the output of the X-ray tube can be increased, the operation can be continued for a long time, and the life of the bearing can be extended. Further, the rotary anode X-ray tube according to the invention of claim 1 has a tapered surface in which the housing portion has the largest diameter in the center in the axial direction, and the diameter becomes smaller toward the end in the axial direction. In addition, the liquid metal can be easily filled in the accommodating portion without a gap. Further, when the shaft is rotated, the liquid metal is collected at the center in the axial direction having the largest diameter of the accommodating portion by the centrifugal force acting on the liquid metal, so that the liquid metal can be prevented from leaking from the accommodating portion.
[0047]
In the rotary anode X-ray tube of the invention of claim 2, the liquid metal is Ga or Ga alloy, and the housing part is made of a corrosion-resistant metal or corrosion-resistant ceramic having corrosion resistance to the Ga or the Ga alloy. It can prevent that the said accommodating part corrodes with Ga or Ga alloy.
[0048]
In the rotary anode X-ray tube according to the third aspect of the present invention, since the housing portion is made of stainless steel coated with TiN, the housing portion can be prevented from being corroded by Ga or Ga alloy. Moreover, since the said accommodating part is formed by coat | covering stainless steel or tool steel with TiN, the whole can be manufactured cheaply rather than making a corrosion-resistant material with respect to Ga or Ga alloy.
[0049]
Since the rotary anode X-ray tube according to the invention of claim 4 includes the injection hole for injecting the liquid metal into the accommodating portion, the liquid metal can be easily injected into the accommodating portion, and the liquid metal is particularly in use. Even if worn out, it can be easily replenished.
[0050]
In the rotary anode X-ray tube according to the fifth aspect of the present invention, the injection hole is threaded and the injection hole is closed with a screw plug, so that the liquid metal can be prevented from leaking from the injection hole. .
[0051]
In the rotary anode X-ray tube according to the sixth aspect of the present invention, since the gap between the supported member and the support member on the outer side in the axial direction from the housing portion is 0.2 mm or less, the liquid metal leaks from the housing portion. Can be prevented.
[0052]
In the rotary anode X-ray tube according to the seventh aspect of the present invention, the pumping groove formed in the supported member or the supporting member pushes back the liquid metal in the gap between the supported member and the supporting member to the accommodating portion. The liquid metal can be prevented from leaking out of the housing portion.
[0053]
In the rotary anode X-ray tube of the invention of claim 8, since the labyrinth groove is formed adjacent to the outside of the pumping groove, Ga or Ga alloy leaks out of the housing part, Even if the liquid leaks outside the pumping groove, the liquid metal leaking in the labyrinth groove can be captured.
[0054]
In the rotary anode X-ray tube according to the ninth aspect of the invention, since the groove angle of the pumping groove is 10 to 20 degrees with respect to a plane perpendicular to the axial direction of the supported member, the supported member is rotating. A pumping force that sometimes pushes the liquid metal back into the housing portion can be secured by the pumping groove, and leakage of the liquid metal from the pumping groove when the supported member is stationary can be suppressed.
[0055]
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a rotary anode X-ray tube according to an embodiment of the present invention.
2 is a diagram showing the relationship between the gap at the end of the accommodating portion of the rotating anode X-ray tube of FIG. 1 and the amount of leakage.
FIG. 3 is a cross-sectional view of a rotary anode X-ray tube according to another embodiment of the present invention.
FIG. 4 is a cross-sectional view of a conventional rotary anode X-ray tube.
FIG. 5 is a front view of a pumping groove of the rotating anode X-ray tube of FIG. 1;
6 is a diagram showing the relationship between the groove angle and the groove length of the pumping groove and the relationship between the groove angle and the pumping force of the rotating anode X-ray tube of FIG. 1. FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Rotary anode X-ray tube, 3 ... Target, 6,76 ... Shaft,
8, 78 ... Bearing housing, 10 ... Housing, 11 ... Tapered surface,
12 ... Screw plug, 13 ... Injection hole, 14 ... Pumping groove,
15 ... Labyrinth groove, 70 ... TiN.

Claims (9)

A supported member connected to the target, a support member that supports the supported member via a rolling bearing, a storage portion formed between the supported member and the support member, and a storage portion With liquid metal that does not substantially evaporate even in vacuum,
The housing portion is provided at a substantially central portion in the axial direction between the plurality of rolling bearings, and the housing portion has the largest diameter in the center in the axial direction, and the diameter increases toward the end in the axial direction. A rotating anode X-ray tube characterized by having a tapered surface with a small diameter.   2. The rotary anode X-ray tube according to claim 1, wherein the liquid metal is Ga or a Ga alloy, and a housing portion in contact with the Ga or the Ga alloy has a corrosion resistance with respect to the Ga or the Ga alloy. A rotating anode X-ray tube made of metal or corrosion-resistant ceramics.   2. The rotary anode X-ray tube according to claim 1, wherein the liquid metal is Ga or a Ga alloy, and an accommodating portion in contact with the Ga or the Ga alloy is made of stainless steel or tool steel coated with TiN. A rotating anode X-ray tube characterized by the above.   4. The rotary anode X-ray tube according to claim 1, further comprising an injection hole for injecting the liquid metal into the housing portion.   5. The rotary anode X-ray tube according to claim 4, wherein the injection hole is threaded, and the injection hole is closed with a screw plug.   The rotary anode X-ray tube according to any one of claims 1 to 5, wherein a gap between the supported member and the support member on the outer side in the axial direction from the housing portion is 0.2 mm or less. Rotating anode X-ray tube.   The rotary anode X-ray tube according to claim 6, wherein a pumping groove for pushing back the liquid metal in the gap between the supported member and the supporting member to the accommodating portion is formed in the supported member or the supporting member. A rotating anode X-ray tube characterized by comprising:   8. The rotary anode X-ray tube according to claim 7, wherein a labyrinth groove for storing a liquid metal is formed adjacent to the outside of the pumping groove.   The rotary anode X-ray tube according to claim 7 or 8, wherein a groove angle of the pumping groove is 10 to 20 degrees with respect to a plane perpendicular to the axial direction of the supported member. tube.

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