JPH03190094A - X-ray tube device - Google Patents

Abstract

PURPOSE:To prevent insulation oil from being scattered caused by damage in the vessel of a tube by providing an oil sump vessel at one end part of the vessel of the tube through a conduit through which insulation oil is communicated with gas, and providing a partitioning wall having through hole at its center in the vessel by means of a pressure valve. CONSTITUTION:When the temperature of positive electrode target 12 of an X-ray tube 2 is abnormaly increased to destroy a vacuum outer case 11, insulation oil 3 is sucked into the vacuum space of the case 11 and the internal pressure is increased with the dissolved gas. A pressure valve 8 in an oil sump vessel 4 is made open accordingly, and the insulation oil inside a tube vessel 1 is moved to the vessel 4 from a lower conduit 5. The dissolved gas moves to the vessel 4 from the upper conduit 5 and discharged to the outside from a gas passing discharge port 10 via a thorough hole 6. The gas is easily moved at this time, and thus that of ten times or more with respect to the insulation oil 3 reaches the pressure valve 8 with the result of accumulation of the insulation oil 3 in the vessel 4. The target 12 is cooled rapidly to prevent generation of gas and make the valve 8 close the through hole 6.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) This invention relates to an X-ray tube device, and in particular, the insulating oil therein evaporates and decomposes, destroying the tube container (haube) and causing the insulating oil to leak outside. This invention relates to means for preventing the scattering of

(Prior Art and Problems to be Solved by the Invention) Generally, an X-ray tube device includes a rotating anode type X-ray tube housed in a tube container and filled with insulating oil.

By the way, since recent X-ray tubes have a large capacity, the anode target has a large amount of accumulated heat. and,
In the unlikely event that the X-ray tube equipment malfunctions, excessive input may enter the anode target.

When this happens, the anode target becomes abnormally hot, resulting in
Eventually, the vacuum envelope of the X-ray tube breaks down, the insulating oil comes into contact with the high-temperature anode target and decomposes, and the inside of the tube is heated to 5K.
High pressures exceeding g/cm2 result.

Conventional X-ray tube equipment does not have such protective measures or is simply equipped with a pressure valve to drain insulating oil, but CT
In extreme cases, for objects such as pipes that are rotated within a frame, the pipe container may even be destroyed.

In this invention, when the temperature of the anode target rises too much due to excessive input to the X-ray tube, and as a result, the vacuum envelope of the X-ray tube is destroyed, the insulating oil in the tube casing evaporates and decomposes. An object of the present invention is to provide an X-ray tube device that prevents the insulating oil from being destroyed and scattering the insulating oil to the outside.

[Structure of the Invention] (Means for Solving the Problems) The present invention provides a method for connecting the outer wall to the outer wall through a plurality of conduits through which insulating oil and pipe gas are conducted, which are integrally protruded from one end of the tube container in the circumferential direction. An oil sump container having a gas passage hole is disposed, a partition plate having a through hole approximately in the center is provided in the oil sump container in a direction substantially perpendicular to the pipe axis, and a pressure valve for opening and closing the through hole is provided. This is an X-ray tube device that is provided with a biasing force in a certain direction.

(Function) According to this invention, the anode target becomes abnormally high temperature.
When the vacuum envelope of an X-ray tube is destroyed, it is possible to prevent the tube vessel from being damaged and insulating oil from being scattered outside.

(Example) Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

The X-ray tube device according to the present invention is constructed as shown in FIG. 1, and the diagonal lines indicate the state of the insulating oil when the vacuum envelope of the X-ray tube is destroyed.

That is, an X-ray tube 2 is housed inside the tube container 1, and an insulating oil 3 is filled therein. Further, an oil sump container 4 is disposed on one end la side of the tube container 1, and this oil sump container 4
and the tube container 1 are integrally connected by a plurality of conduits 5, for example, six conduits 5, which integrally protrude from one end portion 1a in the circumferential direction. Note that the conduit 5 is thin so as to have fluid resistance.

Inside the oil sump container 4, a partition plate 7 having a through hole 6 in the center thereof is provided in a direction substantially perpendicular to the tube axis, and a pressure valve 8 is provided in the through hole 6. A spring 9 is fixed to the pressure valve 8, and the spring 9 applies a biasing force to the pressure valve 8 in a certain direction, thereby opening and closing the through hole 6. In addition, a gas passage port 1 is provided on the outer wall of the oil sump container 4.
0 is formed.

In the figure, 11 indicates a vacuum envelope of the X-ray tube 2, and 12 indicates an anode target.

Now, during operation, when the anode target 12 of the X-ray tube 2 becomes abnormally high temperature and the vacuum envelope 11 is destroyed, the insulating oil 3 is first drawn into the vacuum space inside the vacuum envelope 11, and then the decomposed gas is Internal pressure increases. When the internal pressure rises, the pressure valve 8 in the oil sump container 4 opens, and the insulating oil 3 in the pipe container 1 moves from the conduit 5 at the bottom of the figure to the oil sump container 4, and a part of it flows through the through hole of the partition plate 7. 6 and falls into the oil sump container 4 on the right side of the partition plate 7.

On the other hand, cracked gas flows from the conduit 5 at the top of the figure to the oil sump container 4.
, pass through the through hole 6 of the partition plate 7, and enter the gas passage port 10.
It is then released to the outside.

At this time, due to the difference in conductance between the liquid and gas in the conduit 5, the cracked gas moves much more easily than the insulating oil 3. As a result, more than 10 times the amount of decomposed gas than the insulating oil 3 reaches the pressure valve 8 in the oil sump container 4 from the conduit 5, and the decomposed gas is mainly released to the outside through the pressure valve 8, and the insulating oil 3 is accumulated in the oil sump container 4.

Since the anode target 12 is rapidly cooled while in contact with the insulating oil 3, the generation of cracked gas stops in a short time, and the pressure valve 8 closes the through hole 6 of the partition plate 7 with the spring 9. do.

[Effects of the Invention] According to the present invention, an oil reservoir is integrally provided at one end of the tube container, and even when the anode target becomes abnormally high temperature and the vacuum envelope of the X-ray tube is destroyed, decomposed gas can be removed. The insulating oil passes through the oil sump container and is discharged to the outside, and the insulating oil is stored in the oil sump container, so the insulating oil does not scatter to the outside.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing an X-ray tube device according to an embodiment of the present invention. 1...Tube container, 2...X-ray tube, 3...Insulating oil, 4
...Oil sump container, 5. Conduit, 6. Through hole, 7.
...Partition plate, 8...Pressure valve, 9...Spring,
10... Gas passage port, 11... Vacuum envelope, 12.
...Anode target.

Claims (1)

[Claims] In an X-ray tube device in which an X-ray tube is housed in a tube container and is filled with insulating oil, the insulator is provided integrally protruding in the circumferential direction at one end of the tube container. An oil sump container having a gas passage port on the outer wall is disposed through a plurality of conduits through which oil and internal gas are conducted, and a partition plate having a through hole approximately in the center is provided within the oil sump container and is substantially orthogonal to the tube axis. An X-ray tube device, wherein the pressure valve is provided in a direction in which the through hole is opened and closed, and is provided with a biasing force in a certain direction.