JP3148273B2 - Rotating anti-cathode X-ray generator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotating cathode X-ray generator for generating X-rays by irradiating a rotating rotating cathode with an electron beam.

[0002]

2. Description of the Related Art FIG. 5 shows a configuration of a conventional X-ray generator using a rotating anti-cathode. This X-ray generator is a vacuum vessel 5
In this case, the rotating vacuum cathode 51 and the electron gun 52 are housed in a vacuum chamber 55 of a zero. The vacuum vessel 50 is provided with an X-ray extraction window 53 for extracting X-rays to the outside, and an electron beam emitted from an electron gun 52 is used to cover the outer cylindrical surface of the rotating rotating cathode 51 (electron beam irradiation surface). ), An X-ray beam 54 is generated from the rotating anode 51,
The X-ray beam 54 is taken out through the X-ray take-out window 53.

By the way, heat is generated in the rotating anode 51 due to the collision of the electron beam from the electron gun 52. In order to prevent the electron beam irradiation surface of the rotating anode 51 from being damaged by the heat, the rotating anode 51 is prevented. It has been widely practiced to circulate cooling water inside to take away the generated heat. FIG. 6 shows a configuration of a conventional rotating anode having such a cooling structure. Electron beam irradiation surface 6 that emits X-rays on the outer periphery
1 has a hollow rotating shaft 6
2, and is rotatably supported by driving means such as a motor (not shown). A fixed partition 63 that partitions the inside of the rotating anode 51 into a cooling water inlet side 70 and a cooling water outlet side 71 is arranged inside the rotating anode 51. The fixed partition 63 is provided at the left end of a hollow fixed shaft 64 coaxially inserted into the rotating shaft 62.

[0004] A cooling water inlet 65 arranged on the right side of the apparatus.
Is supplied to the cooling water inflow side 70 in the rotating anode 51 through a gap between the inner peripheral surface of the rotating shaft 62 and the outer peripheral surface of the fixed shaft 64. Then, the rotating anti-cathode 51
After flowing into the back side of the electron beam irradiation surface 61 for cooling, the cooling water is sent to the cooling water discharge port 66 through the cooling water discharge side 71, through the inside of the fixed shaft 64.

[0005]

In the above-described conventional rotary anti-cathode X-ray generator, the electron beam irradiation surface 61 is cooled by circulating cooling water in the rotary anti-cathode 51 as described above. On the inflow side 70 of the cooling water, the cooling water sent to the electron beam irradiation surface 61 side due to the centrifugal force of the rotating anti-cathode 51 is prevented from flowing in by the fluid friction between the fixed partition 63 and the cooling water. On the water discharge side 71, the circulation of the cooling water is not good because the flow of the cooling water toward the center is obstructed by the fluid friction with the rotating anode 51 and the centrifugal force. There was a problem that can not be obtained.

In order to counteract resistance such as fluid friction and centrifugal force, a method of forcibly sending cooling water by increasing the water pressure on the inflow side is considered. However, with this method,
As a result, extra energy is consumed, leading to a decrease in cooling efficiency. SUMMARY OF THE INVENTION The present invention has been made in view of the above-described conventional problems, and has a rotating / cathode X-ray generator capable of improving the cooling effect of a rotating / cathode by efficiently circulating cooling water. It is intended to provide.

[0007]

According to a first aspect of the present invention, there is provided a rotary-cathode X-ray generator, comprising: a hollow rotary shaft integral with the rotary-cathode; An inserted hollow fixed shaft, having a fixed partition connected to the fixed shaft and partitioning the inside of the rotating anode into a coolant inflow side and a coolant discharge side, the inner peripheral surface of the rotating shaft and the Cooling liquid is supplied through a gap between the outer peripheral surface of the fixed shaft and the cooling liquid flowing from the cooling liquid inflow side in the rotating cathode to the cooling liquid discharging side, and further discharged through the fixed shaft. In the rotating cathode X-ray generator that cools the rotating anode by performing the rotating disk, the rotating disk is disposed on the cooling fluid inflow side of the rotating anode and rotates integrally with the rotating anode. It is provided between the rotating disk and the back of the rotating anti-cathode, A rotating blade that guides a liquid from a central portion to an outer peripheral portion of the rotating anti-cathode; a fixed disk disposed on the cooling liquid discharge side of the rotating anti-cathode and integrated with the fixed partition; and the fixed disk. And fixed vanes provided between the fixed partition and the fixed partition for guiding the coolant from the outer periphery to the center of the rotating anode.

According to a second aspect of the present invention, there is provided a rotary anti-cathode X-ray generator according to the first aspect, wherein the rotary blades extend from a central portion to an outer peripheral portion of the rotary disk. The fixed blade is formed in a curved shape extending toward the opposite side to the rotating direction of the rotating cathode, and the fixed blade extends toward the outer peripheral portion from the center of the fixed partition and is opposite to the rotating direction of the rotating anode. It is characterized by being formed in a curved curve shape.

Further, the rotating anti-cathode X-ray generator according to claim 3 is the rotary anti-cathode X-ray generating device according to claim 1 or 2, wherein the fixed partition wall extends from a central portion to an outer peripheral portion. And has a shape which is bent in the direction of the rear surface of the rotating cathode at the outer periphery thereof and extends parallel to the electron beam irradiation surface of the rotating cathode. The rotating disk has a curved shape from the center to the outer periphery of the fixed partition.

[0010]

According to the present invention, a disk is provided on the cooling liquid inflow side of the rotating anode, and the cooling liquid is forcibly supplied between the disk and the back surface of the rotating anode. With the provision of rotating blades to be sent to the back side of the irradiation surface, the direction of the coolant is a combination of the circumferential force due to the centrifugal force accompanying the rotation of the rotating anti-cathode and the pushing force perpendicular to the rotating blade surface by the rotating blades. Flows toward the electron beam irradiation surface under the force of. As a result, the flow of the coolant toward the electron beam irradiation surface is not hindered by the fluid friction between the fixed partition and the coolant as in the related art, and the coolant can efficiently flow.

[0011]

FIG. 1 is a side sectional view showing an embodiment of a rotary anti-cathode X-ray generator according to the present invention, and FIG. 2 is a partially enlarged sectional view thereof. The rotating anti-cathode 1 is formed in a cylindrical shape, and has an electron beam irradiating surface 2 on its outer periphery for emitting X-rays by irradiating an electron beam. The rotating anode 1 is integrated with a hollow rotating shaft 3 rotatably supported by a bearing 30 provided on a mounting flange 31. Rotary axis 3
Is rotated by driving means (not shown) such as a motor or the like directly connected via a driving pulley 32.

As shown in FIG. 2, a fixed partition 4 for partitioning the inside of the rotating anode 1 into a cooling water inflow side 20 and a cooling water discharge side 21 is arranged inside the rotating anode 1. As shown in FIG. The fixed partition 4 is formed in a cylindrical shape that fits inside the rotating anti-cathode 1 as shown in the figure, and its center is fixed to the tip of a hollow fixed shaft 5 coaxially inserted into the rotating shaft 3. Have been. The fixed shaft 5 is open to the cooling water discharge side 21 at the center of the fixed partition 4.

A gap between the inner peripheral surface of the rotating shaft 3 and the outer peripheral surface of the fixed shaft 5 serves as a cooling water inflow passage 22 communicating with the cooling water inflow side 20. It is connected to the entrance 6 (FIG. 1). Further, the inside of the fixed shaft 5 is a cooling water discharge passage 23 communicating with the cooling water discharge side 21, and the cooling water discharge passage 23 is a cooling water discharge passage for discharging the cooling water circulated in the rotating anode 1. It is connected to exit 7 (FIG. 1).

On the cooling water inflow side 20 in the rotating anode 1,
A disk 12 that rotates integrally with the rotating anode 1 is provided. The disk 12 is provided so as to float from the inner wall of the back part 10 via a rotary blade 13 provided on the inner wall of the back part 10 joined to the rotating shaft 3 of the rotating anode 1. Also,
The shape of the disk 12 is slightly curved along the back surface 10, and the outer periphery thereof is located near the outer periphery of the fixed partition 4. Thereby, the cooling water flowing into the cooling water inflow side 20 in the rotating anode 1 does not directly hit the fixed partition 4. FIG. 3 is a view showing the structure of the rotating blades 13 with the disk 12 removed, and as shown in the figure, a plurality of rotating blades 13 are provided at regular intervals from the center of rotation toward the outer periphery. Is formed in an arc shape bent in a direction opposite to the rotation direction R of the first direction. The space between the back surface 10 and the disk 12 forms an inflow passage for cooling water.

The inner dimensions of the back portion 10 and the disk 12 and the shape of the rotating blades 13 are determined by calculation from the number of rotations of the rotating anode 1, the cooling water flow rate, the cooling water pressure, and the like.

On the cooling water discharge side 21 of the rotating anti-cathode 1, there is arranged a disk 15 located close to the back side of the front surface 11 of the rotating anti-cathode 1. This disk 15 is formed to have substantially the same size as the fixed partition 4 and has fixed guide blades 16.
And is provided on the front surface of the fixed partition 4 via the base. FIG. 4 is a view showing the structure of the fixed guide blade 16 on the fixed partition 4 with the disk 15 removed. As shown, the fixed guide blade 16 is moved from the center of rotation in the same manner as the rotary blade 13. A plurality of them are provided at regular intervals toward the outer circumference, and each is formed in an arc shape bent in a direction opposite to the rotation direction R of the rotating anode 1. The space between the fixed partition 4 and the disk 15 forms a cooling water discharge passage.

The inner dimensions of the fixed partition 4 and the disk 15 and the shape of the fixed blade 16 are determined by calculation from the flow rate of the cooling water, the pressure of the cooling water, and the like.

Next, the operation of the rotating anti-cathode 1 constructed as described above will be described. The cooling water supplied from the cooling water inlet 6 flows through the inflow passage 22 between the rotating shaft 3 and the fixed shaft 5 into the cooling water inflow side 20 in the rotating anode 1. The flowing cooling water flows to the back side of the electron beam irradiation surface 2 through a flow path between the back surface portion 10 and the disk 12. At this time, since the rotating blades 13 are formed as described above, the cooling water is rotated in the circumferential direction by the centrifugal force caused by the rotation of the rotating anti-cathode 1 in the direction of arrow R and the surface of the rotating blades 13 by the rotating blades 13. Upon receiving the force in the direction obtained by combining the pushing force in the right angle direction, it flows in the direction toward the electron beam irradiation surface 2 as shown by the arrow P in FIG.
As described above, the cooling water is supplied to the rotating back part 10 and the disc 12.
Flows under the above-mentioned force along the flow path between the fixed partition wall 4 and the cooling water, the flow into the electron beam irradiation surface 2 side is hindered by the fluid friction between the fixed partition wall 4 and the cooling water as in the related art. Not
It will flow efficiently.

The cooling water flowing to the back surface of the electron beam irradiation surface 2 and cooling the cooling water further flows to the cooling water discharge side 2 in the rotating anode 1.
1 and to the center along a stationary flow path between the fixed partition 4 and the disk 15. At this time, the cooling water flowing by receiving a force in the rotational direction R by viscous friction with the back surface of the electron beam irradiation surface 2 is guided by the fixed guide vanes 16 in the direction of arrow Q in FIG. Flows towards the center of the. As described above, the cooling water on the cooling water discharge side 21 flows through the flow path between the fixed partition wall 4 and the disk 15 by the fixed guide vanes 16, and the fluid friction between the rotating rotating cathode 1 and the centrifugal force associated therewith. As a result, it does not receive the force that hinders the flow, so that it flows smoothly and is discharged. The cooling water flowing to the center of the fixed partition wall 4 is then guided to the cooling water discharge port 7 through the discharge passage 23 in the fixed shaft 5.

Although the present invention has been described with reference to the preferred embodiments, the present invention is not limited to the above embodiments. For example, the shapes and numbers of the rotating blades 13 and the fixed guide blades 16 can be variously changed within a range where the above-described effects can be obtained.

[0021]

According to the rotary anti-cathode X-ray generator according to the present invention, the interior of the rotary anti-cathode is partitioned by a fixed partition,
A rotating disk and rotating blades are provided on the separated coolant inflow side, and a fixed disk and fixed blades are further provided on the partitioned cooling fluid discharge side, so that the flow of the coolant inside the rotating anode is smooth. Thus, the cooling efficiency can be improved.

[Brief description of the drawings]

FIG. 1 is a side sectional view showing one embodiment of a rotating anti-cathode portion of a rotating anti-cathode X-ray generator according to the present invention.

FIG. 2 is a partially enlarged sectional view showing a main part of the embodiment in an enlarged manner.

FIG. 3 is a plan view showing a configuration of a rotating blade in a rotating anode in the embodiment.

FIG. 4 is a plan view showing a configuration of a fixed guide blade of a fixed partition in the embodiment.

FIG. 5 is a diagram showing a schematic configuration of an X-ray generator using a rotating anti-cathode.

FIG. 6 is a cross-sectional view showing a configuration of a conventional rotating anti-cathode.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Rotation anti-cathode 2 Electron beam irradiation surface 3 Rotation axis 4 Fixed partition wall 5 Fixed axis 10 Rotation anti-cathode back part 11 Rotation anti-cathode front part 12, 15 Disk 13 Rotating blade 16 Fixed guide blade 20 Cooling water inflow side 21 Cooling water Discharge side

Claims (3)

(57) [Claims] And 1. A rotating anode integral hollow rotary shaft, a hollow fixed shaft inserted coaxially into said <br/> rotating the shaft, the interior of the rotating anode have been coupled to the fixed shaft and a fixed partition wall partitioning the cooling liquid inlet side and the coolant discharge side, supplying coolant through the gap between the outer peripheral surface of the fixed shaft and the inner peripheral surface of the rotary shaft, the said cooling liquid from the cooling liquid inlet side in the rotary anticathode flowed through the coolant discharge side,
Further, the in rotating anode X-ray generator for cooling of the rotating <br/> rolling anticathode by draining through a fixed inner shaft, prior to be arranged in the coolant inlet side of the rotating anticathode
A rotating disk that rotates integrally with the rotating anode, and a rotating disk provided between the rotating disk and the back surface of the rotating anode.
From the center to the outer periphery of the rotating anti-cathode
A rotating vane for guiding, and a cooling vane disposed on the cooling fluid discharge side of the rotating anti-cathode;
A fixed disk integral with the fixed partition and cooling provided between the fixed disk and the fixed partition.
A solid for guiding the liquid from the outer peripheral portion to the central portion of the rotating anti-cathode.
A rotating anti-cathode X-ray generator comprising a fixed blade . 2. The rotating disk according to claim 1, wherein the rotating blades extend from a center to an outer periphery of the rotating disk.
Extends and bends in the opposite direction to the direction of rotation of the rotating anti-cathode
The fixed blade is formed in a curved shape, and extends from a central portion of the fixed partition to an outer peripheral portion.
Extends and bends in the opposite direction to the direction of rotation of the rotating anti-cathode
A rotating anti-cathode X-ray generator characterized by being formed in a curved shape . 3. The rotating partition according to claim 1, wherein the fixed partition wall extends from a central portion to an outer peripheral portion.
It extends parallel to the front surface of the cathode and
In the direction of the back of the rotating anti-cathode
Shape of the rotating anti-cathode extending parallel to the electron beam irradiation surface
Has, said rotary disk over the outer peripheral portion from the central portion of the fixed partition wall
Rotating cathode X characterized by having a curved shape
Line generator.