JPH0456440B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to an X-ray tube device in which a rotating anode X-ray tube is housed in a container (Haube).

(Prior art) As is well known, a rotating anode type X-ray tube is housed in a container called a Haube, and this container is further filled with an insulating/cooling medium such as insulating oil or insulating gas. .

That is, the conventional X-ray tube device for magnifying mammography, for example, is constructed as shown in FIG. 4 or FIG.
An X-ray tube 2 is housed inside, and insulating oil 3 is filled therein. In such an X-ray tube device,
In the unlikely event that an abnormality occurs in X-ray tube 2 during operation, container 1
If the insulating oil 3 is broken internally and suction occurs, the insulating oil 3 becomes high temperature, vaporizes, and expands. Then, the internal pressure of the container 1 becomes abnormally high, leading to the destruction of the container 1.

Therefore, in order to prevent the container 1 from being destroyed, a small chamber 4 is provided protruding from the outer periphery of the container 1, as shown in FIG. 4 or FIG. ) 5 to absorb expansion when the insulating oil 3 reaches an abnormally high temperature.

(Problems to be Solved by the Invention) However, as shown in FIG.
If it is too large, the empty tray 5 will be drawn into the container 1, and the rubber of the empty tray 5 will stretch due to pressure, making it impossible to maintain the appropriate size of the empty tray 5. Then, proper expansion cannot be absorbed. In addition, if the pressure transmission holes 7 are a large number of small holes as shown in FIG. 4, no suction will occur, but there is a limit to the size of the pressure transmission holes 7 in casting. Machining is limited to diagonally drilling holes, but since the inner diameter of container 1 is small (diameter 130 mm), machining is difficult and there is a limit to the number of holes, making this method unfeasible due to economic efficiency and processing technology. It is possible.

Therefore, as an example of solving the above problems, there is a structure described in Japanese Utility Model Application Publication No. 127600/1983.
As shown in FIG. 6, a cylinder 9 having a large number of small holes 8 is interposed between the inner surface of the small chamber 4 and the empty tray 5.

In this case, a cylinder 9 having a large number of small holes 8 is interposed between the inner surface of the small chamber 4 and the empty tray 5, so that when filling the insulating oil 3, the empty tray 5 is inserted into the container.
It is not pulled inward, and the appropriate size and shape of the empty tray 5 can be maintained. Further, when the insulating oil 3 expands, pressure is transmitted over almost the entire surface of the empty basin 5, so reliability is extremely high. Furthermore, the pressure transmission hole 6 may be a large hole (length 1), which is advantageous from the viewpoint of processing technology and economy.

However, according to the structure described in the above-mentioned Utility Model Publication No. 58-127600, the conventional example (Figs. 4 and 5)
Although it is possible to solve the problems in Figure),
The small chamber 4 on the outer periphery of the container 1 forces the container 1 to become larger. If the container 1 is large, the capacity of the insulating oil 3 will be large, resulting in large pressure changes at high temperatures, which will cause problems with the pressure resistance of the tube, and there is room for further improvement.

Furthermore, although the shape of the empty basin 5 in FIGS. 4 to 6 above is U-shaped in cross section (that is, a cylindrical shape with a bottom), cracks may occur at the bent portions after long-term use, resulting in accidents such as oil leakage. There is a possibility that it may be connected. Generally, the empty basin 5 having a U-shaped cross section is easy to manufacture, but when absorbing the expansion of the insulating oil 3, it can be formed into any shape (indeterminate shape).
For a certain thickness, part of the
It can bend as much as 360°. Furthermore, if the rubber of the empty tray 5 is immersed in oil, its hardness increases over time, and the degree of rupture increases over time. Therefore, in order to prevent oil leakage, it is necessary to ensure uniformity of the rubber material of the empty tray 5 and thorough work management during manufacturing, but even so, oil leakage accidents due to rupture of the empty tray 5 are still rare. Ta.

In order to solve the above problems, this invention aims to reduce the size and weight of the container by accommodating the small chamber and the empty tray inside the container, and also prevents oil leakage accidents due to the rupture of the empty tray. The purpose is to provide a wire tube device.

[Structure of the Invention] (Means for Solving the Problems) This invention does not provide a small room around the outer periphery of the container as in the conventional case, but instead houses a small room and an empty tray made of rubber-like resin inside the container. Furthermore, this X-ray tube device is such that the rubber tray has a substantially doughnut-like shape and a half-W-shaped cross section, and a thick wall portion is integrally formed at the folded portion.

(Function) According to this invention, since the small chamber and the empty tray are housed within the container, it is possible to make the container smaller and lighter, and it is also possible to keep the pressure change inside the container more constant. Therefore, the pressure resistance of the container is improved. or,
The shape of the empty tray is approximately donut-shaped and has a half-W-shaped cross section, and the thick part is integrally formed at the folded part, which prevents the rubber tray from bursting and prevents oil leaks. Accidents can be prevented.

(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 shown in FIGS.
It is configured as shown in Figures a, b, and c, and Figure 2 a,
b and c are exploded views of the main parts of FIG. The same parts as in the conventional example are designated by the same reference numerals. 1 is a container called a Haube, and a cylindrical high-voltage cable receiver 10 is provided inwardly protruding from one end thereof. Inside such a container 1 is an X-ray tube 2 .
is accommodated and filled with insulating oil 3,
The X-ray tube 2 has a stator 11, a stator holder 12, a small room (empty tray storage room) 13, and an empty tray lid 14.
It is fixed to the container 1 via.

Furthermore, a rubber empty tray 15 is provided near the high-voltage cable receiver 10 inside the container 1, and the small room 1 mentioned above is equipped with a rubber empty tray 15.
Surrounded by 3. In this case, as is clear from FIG. 2b, the rubber empty tray 15 is formed into a substantially donut shape and a half W-shaped cross section, and thick portions 15a, 15b, 15c are formed at the folded portions.
are integrally formed and are expandable and contractible in the radial direction, that is, in the direction perpendicular to the axis of the container, and the high voltage cable receiver 1
It is provided coaxially with 0. Thick part 15a, 1
The reason why 5b and 15c are integrally formed is that they are made thick, for example, in the shape of an O-ring, and the structure is such that deformation of these parts is suppressed as much as possible. In addition, the height h of the central peak (folded portion 15b) of the W-shaped half cross section
is the height H of the rubber empty tray 15 (both are shown in Figure 2 b)
It is advantageous to be close to H compared to (see), but if defoaming etc. are taken into account, it is up to about 2/3 of H. Furthermore, the open end of the rubber empty tray 15 is fitted with an O-ring 15.
a, 15e are provided, and the inside is sealed by being covered with an empty tray lid 14 as shown in FIG. 2a. Also, as shown in Figure 2c, the small room 13
It has a cylindrical shape with one end folded back, has a pressure transmission hole 16, is fitted to the outside of the high voltage cable receiver 10, and a rubber empty tray 15 is accommodated in the folded part 19. And this small room 13 is empty tray lid 1
4, and the empty tray lid 14 is screwed to the container 1. Further, a high voltage cable receiver 10 is fixed to the end of the small room 13 by a ring nut 17. Furthermore, a stator holder 12 is screwed into the small chamber 13.

Note that 18 in the figure is an X-ray irradiation port.

Now, during operation, the input energy becomes thermal energy, and this heat is transmitted to the entire container 1 via the insulating oil 3. This heat heats and expands the insulating oil 3. Then, the insulating oil 3 enters and exits the small room 13 through the pressure transmission hole 16, and pressure is applied to the rubber empty tray 15 and the entire container 1. Since the pressure is not relieved in the container 1, the rubber empty tray 15 shrinks. in,
It acts to keep the pressure inside the container 1 constant.

On the other hand, when the insulating oil 3 is cooled down due to completion of operation, etc., the insulating oil 3 contracts, and the rubber tray 15 expands. In this way, the pressure inside the container 1 is kept constant. Furthermore, when filling the insulating oil 3, the rubber empty tray 15 is drawn in, but this is prevented by the small chamber 13.

As a result, the container 1 can be made smaller and lighter, the amount of insulating oil 3 inside the container 1 can be reduced, pressure changes due to thermal expansion and contraction are reduced, and constant pressure is reliably maintained. be done.

In addition, in the conventional structure, the rubber empty tray 5 is bent into an irregular shape, but in the present invention, the rubber empty tray 15 has a half-W-shaped cross section, and the rubber tray 5 is bent into an irregular shape. By doing so, bending of the rubber empty tray 15 can be prevented to a minimum.

(Modification) As shown in FIG. 3, deformation reinforcing links 19 may be inserted into the thick portions 15a, 15c of the rubber tray 15 to prevent deformation in the axial direction.

Further, in the above embodiment, the hollow tray 15 has one central peak (folded portion 15b) of the W-shaped half cross section, but it may have two or more.

Furthermore, instead of the small chamber 13, an insulating cover may be provided which is donut-shaped and has a half U-shaped cross section, and a gap for inflow of the insulating oil 3 may be provided between one end of this insulating cover and the inner wall of the container 1. .

Further, the rubber tray 15 in the above embodiments and modifications may be made of general rubber, but it may be made of rubber that can not only follow minute pressure changes but also has excellent high temperature resistance, strength, insulation, and oil resistance. (Not limited to rubber) is better.

[Effects of the Invention] According to the present invention, since the small chamber and the resin empty tray are housed in the container, the container can be made smaller, lighter, and less expensive, and the pressure change inside the container can be reduced. Since the pressure can be kept more constant, the pressure resistance of the container is improved.

In addition, in this invention, the shape of the empty tray is approximately donut-shaped and has a half W-shaped cross section, and the thick part is integrally formed at the folded part, so that the deformation is within the range of 0 to 90 degrees. Therefore, no excessive force is applied to the empty tray. As a result, rupture of the empty basin can be prevented, and serious accidents such as oil leakage can be prevented.

Furthermore, since an empty tray is provided inside the container, the oil filling operation can be easily degassed in a short time, and it is possible to create a high pressure resistant device that eliminates bubbles inside the device.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing an X-ray tube device according to an embodiment of the present invention, FIGS. 2 a, b, and c are cross-sectional views showing the main parts of FIG. FIG. 4, FIG. 5, and FIG. 6 are cross-sectional views showing a conventional X-ray tube device. 1...Container, 2 ...X-ray tube, 3...Insulating oil, 10...High voltage cable receiver, 13...Small room, 15...Empty tray, 1
5a, 15b, 15c...thick wall portions.

Claims (1)

[Claims] 1.
In an X-ray tube device in which a ray tube is accommodated and filled with insulating oil, and a resin empty tray is disposed in the container to absorb expansion of the insulating oil, the empty tray is approximately donut-shaped. What is claimed is: 1. An X-ray tube device characterized in that the tube is formed into a W-shaped half-section, and a thick wall portion is integrally formed at the folded portion. 2. The X-ray tube device according to claim 1, wherein the empty tray is provided coaxially with the high voltage cable receiver.