JPS58216346A - Rotary anode x-ray tube device - Google Patents

Abstract

PURPOSE:To prevent an excessive temperature rise and to allow the device itself to be made a large capacity by providing an injection cooling mechanism injecting oil to the X-ray radiation window portion of a vacuum container for cooling. CONSTITUTION:An electron beam is emitted from a cathode body 2 to an anode target 5, thus radiating X-rays, and the anode target 5 is heated to about 1,200 deg.C. Insulation oil 13 fed by pressure from an oil cooling unit 15 is injected from an injection port 14a through a pipe 14 to an X-ray radiation window 1b, then it passes in the C direction through a clearance 17 formed between a vacuum container 1 and a frame 10 and flows in the D direction. Since the cooled insulation oil 13 is directly injected to the X-ray radiation window 1b heated to the highest temperature, the cooling can be performed extremely effectively.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a rotating anode X-ray tube apparatus, and more particularly to a cooling mechanism for an X-ray emission window of an X-ray tube.

2. Description of the Related Art Conventionally, a rotating X-ray tube device having a compact structure has been proposed, in which a vacuum container containing a rotating anode body and a cathode body is disposed in a housing filled with oil. In recent years, with the development of medical technology, there has been a demand for large-capacity rotating anode X-ray tube devices.
High heat is generated in a localized part of the vacuum vessel, and as a result, the vacuum vessel melts, or even if it does not melt, gas is released from the vacuum vessel, reducing the degree of vacuum inside the vacuum vessel and causing a discharge phenomenon. However, there was a problem that X-edge photography was no longer possible.

In order to improve this problem, we have developed a system that has a complete injection cooling mechanism in the housing that cools down the back side of the target of the X-ray tube by injecting oil into the housing as a part of the vacuum vessel that generates high heat. Rotating anode x-ray tube devices have been proposed.

However, with such a structure, the radiation effect of the back side of the target of the X-ray tube is sufficiently expected, but the temperature of the X-ray radiation window of the vacuum vessel, which is particularly high during X-ray radiation, is Sufficient cooling was not obtained, and therefore the above-mentioned conventional drawbacks were not completely improved.

Therefore, it is uninvented (・11) It was made in view of the above-mentioned drawbacks, and its purpose is to be able to increase the capacity, have an extremely good cooling effect, always be able to perform stable xi shooting, and An object of the present invention is to provide a rotating anode X-ray tube with high X-ray intensity and long life.

In order to achieve such an object, the present invention has a structure in which an injection cooling mechanism is disposed in a housing for injecting oil to the X-ray emitting window portion of the gusset to cool it.

Hereinafter, the present invention will be explained in detail using the drawings.

FIG. 1 is a sectional view showing an embodiment of the rotary anode X snow melting device according to the invention. In the figure, a cathode body 2 is arranged at one end of a glass vacuum container 1, and a rotating anode assembly 3 is arranged at the other end.

This unique polar body 2 has a solder electrode 4 and a filament (not shown). Also, a rotating anode body with three disc-shaped positive electrodes,
The target 5 supports the target 5, is integrated with the rotating shaft 6, and deeply supports rotation via the rotatable rotor T and the ball bearing 8, and the end thereof is connected to the vacuum vessel 1. It has a thin receiving box 9 extending outward. Further, a motor stator 11 is disposed on a frame 10 disposed on the outer peripheral side of a portion 1a corresponding to the rotor 7 of the vacuum vessel 1, and the anode target 5 is provided with a rotating magnetic field generated by the motor stator 11. is configured to be driven by Further, the cathode body 2 and the rotating positive body 3 are vacuum-sealed in a vacuum container 1, and the vacuum container 1 is made of glass and has an X-shaped structure corresponding to the cathode body 2 and the anode target 5. The radiation i1b has a large diameter, and the portion 1a corresponding to the rotor 7 has a small diameter, and the middle portion is a curved portion 1c that curves toward the middle at the back of the first-field pole target 5.

Further, a pipe 14 constituting an injection cooling mechanism for injecting insulating oil 13 in the housing 12 to the X-ray emission window 1''o is installed on the inner wall of the housing 12 on the motor stator 11 side, which will be described later. 14 has an X-ray emission window 1 at one end.
'b, the other end of the injection cooling mechanism is fixed to the frame 10 and is disposed outside the housing 12.
It is connected to an oil cooler 152 and an oil circulation pump 16 to cool the insulating oil 13 pumped into the pipe 14 and forcibly circulate it in the direction shown by arrow A. Vacuum container 1 in which the positive I-body 3 is vacuum-sealed
．． Frame 10. The components such as the motor stator 11 and the tube 14 are housed in the housing 12, and an insulating oil 13 is provided in the housing 12 for the purpose of electrical insulation and cooling/heating of the rotating anode body 3. It is enclosed.

In the rotating anode X-ray tube device configured in this way, high sulfur pressure is applied between the cathode body 2 and the anode target 5, and the cathode body 2
An electron beam is emitted to the explicit target 5, passes through the X-ray emission window 1b, and generates X-rays in the direction of arrow B. At this time, the anode target 5 is normally separately heated to about 1200°C, but since the inside of the vacuum vessel 1 is in a high vacuum, the heat of the anode target 5 is transferred through the entire vacuum vessel 1 by radiation heat transfer.
Heat is radiated to the insulating oil 13 inside the puffer fish 12. However, the temperature of the anode target 5 where the electron beams emitted from the cathode 4 and the lifting platform of the rotating anode X-ray tube system are designed to accommodate all personnel becomes extremely high, so the X-ray radiation is The temperature in the vicinity of the window 1b is highest, and if this area is not sufficiently cooled, the vacuum container 1 may melt, or even if it does not melt, gas will be released from the vacuum container 1. Therefore, in the present invention, an injection cooling mechanism is provided in the vicinity of the vacuum container 1 including the X-ray emission window 1b, in which the injection port 14a of the cold ready pipe 14 is arranged. The insulating oil 13 that has been pressure-fed passes through the pipe 14 and enters the ll1iT injection port 1.
4a to the X-ray emission window 1b. Then, the injected insulating oil 13 passes through the direction C in the figure and the gap 1T formed between the vacuum container 1 and the frame 10.
It will flow in the direction shown in the figure. As a result, in the cooling method according to the present invention, the insulating oil 13 cooled by the M liquid is injected from the injection port 14a of the tube 14 onto the surface of the X-ray emission window 1b that is heated to the highest temperature in the vacuum vessel 1. Provides extremely effective cooling. Further, by adjusting the flow rate, flow rate, etc. of the insulating oil 13 in the pipe 14 using the circulation pump 16, the cooling effect can be further varied.

Therefore, various problems such as melting of the vacuum container 1 or generation of gas from the container 1 itself can be prevented.

FIG. 2 is a sectional view showing another embodiment of the rotating anode X-ray tube device according to the present invention. The same symbols as in FIG. The difference from the diagram is that the motor stator 1 is equipped with a frame IOK.
An oil container 18 is disposed on the side of the first anode target 5, and has a structure in which the oil container 18 is arranged adjacent to the curve 1c of the vacuum container 1. The oil container 18 has a plurality of injection holes 18b formed in the surface 18a facing the curved portion 1c.
8b to the insulating oil 13 in the housing 12 to the curved portion 1.
It is configured to inject at the same time as c. Further, this oil container 18 is connected to the pipe 14 together with the injection port 14a, and is connected to an oil cooler 15 and an oil circulation pump 16 disposed outside the housing 12 to be connected to the oil container 18. The insulating oil 13 that is pumped to is cooled and is forcedly circulated in the direction shown by arrow A.

According to such a configuration, the X-ray emission window 1b of the vacuum container 1
The vicinity is cooled by the cooling insulating oil 13 that is directly cooled from the injection port 14a of the pipe 14, and the cooled insulating oil 13 is directly injected from the injection hole 12b of the oil container 18 at the curved portion 1c, which has a relatively high temperature. The curved portion 1
A part of the cooling insulating oil 13 that flows out in contact with the surface c overflows over the outer shape of the vacuum vessel 1 and also flows in contact with the X-ray emission window 1b, so that the X-ray emission window 1b is cooled by light. Therefore,
Even more effective cooling becomes possible, and an effect equal to or greater than that described above can be obtained.

In addition, in the above-mentioned Example 2, the injection cooler, the injection port ii of the tube constituting a part of the skin, and the platform having a circular cross section have been explained. The cross section of the injection nozzle is a circular shape.

It goes without saying that even if it is rectangular or semicircular, even if its tip is <ifl>, or even if several injection ports f=i are provided, the same effect as described above can be obtained. - In addition, in the above-mentioned example row 2, the lifting platform was explained using a glass material to close the housing, but the present invention is not limited to this, and The advantage of using a true container is that this metal container has better thermal conductivity than a glass vacuum container and has a greater cooling effect.As explained above, it is a non-invention. According to the rotating anode X-ray tube i, cough! By installing the R cooling Isotachibana, it is possible to inject cooled insulating oil into the X-ray emission window of the vacuum container and prevent excessive temperature rise of the X-ray emission window, making it possible to increase the capacity of the device itself. Moreover, because the cooling efficiency is extremely high, no gas is extracted from the vacuum container.
Various outstanding effects can be obtained, such as being able to maintain a stable degree of vacuum at all times and preventing discharge phenomena during long-term use.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view showing an example of a rotary anode X-ray tube apparatus according to the present invention, and FIG. 2 is a cross-sectional view showing another embodiment of the rotary anode X-ray tube apparatus according to the present invention. 1... Vacuum container, 1b... X-ray radiation, Shishi, 1c
...Curved part, 2...Yin; holder, 3...Rotation 1@pole, 4...Electrode, 5...1 pole target, 5a... Back, 6... rotating shelf, T...
・Rotor, 8h...Ball bearing, 9...Bearing box, 10
... Frame, 1-1 ... Motor stator, 1
2...Housing, 13...Insulating oil, 14...
...Blind, 14a...Spout mouth, 15...J' mountain cooling signal 5.16...Oil circulation pump, 17...Gap, 18...Oil container, 18a... face, 18b...
...Injection hole. Representative Patent Attorney Toshiko Hakuta, I, 1'

Claims (1)

[Claims] In a rotary anode X-ray tube device in which a vacuum container housing a cathode body and a rotating anode body is placed in a housing sealed with insulating oil, cooling insulating oil is provided in the housing and in an X-ray emission window of the vacuum container. A rotating anode X-ray tube device characterized in that it is equipped with an injection cooling mechanism that cools the anode by injection.