JPH0132720Y2 - - Google Patents

Description

[Detailed explanation of the idea] [Technical field of invention] This invention relates to an X-ray tube device.

[Background Art and its Problems] As shown in Fig. 1, for example, in an X-ray tube device used for fluorescent X-ray analysis, a high positive voltage is applied to the anticathode (anode) of the X-ray tube. An X-ray tube device having a structure in which this anticathode is directly water-cooled is known. In the figure, reference numeral 11 represents an X-ray tube, 12 is a bottomed cylindrical anticathode block, 13 is a target plate, 14 is a cathode arranged around the anticathode block, 15 is an X-ray emission window, and 16 is a glass tube. 17 is a tube storage container for housing an X-ray tube inside, 18 is a high voltage receptacle for inserting and connecting a high voltage cable, and 19 is for guiding cooling water to the inner wall of the anticathode block. Double metal water guide pipe, 20 is its tip nozzle, 21 is an insulator cooling pipe, 21a and 21b are water supply and drain ports, 22 is a joint that connects the cooling pipe and the water guide pipe, 23 is a receptacle. It represents a conductor spring that electrically connects the conductor pipe and the conductive pipe and applies a high voltage to the anticathode. The cooling pipe 21 is spirally shaped to have a longer overall length in order to increase the electrical resistance of the cooling water passage, and is integrally molded around the outer periphery of the receptacle 18 with a resin insulator 24. The tube container is filled with insulating oil and operated.

In an X-ray tube device with such a structure, the anticathode is directly cooled with water during operation, but the temperature of the anticathode gradually rises with long-term operation.
The tube container, insulator 24, and receptacle 18 also gradually become hotter. On the other hand, since cold water is always supplied to the cooling pipe, the receptacle that is integrally connected to the pipe is also cooled. Therefore, when the atmospheric humidity is high, dew condensation is often observed on the inner surface of the receptacle. Naturally, when this condensation occurs, the withstand voltage performance of the receptacle deteriorates, and creeping discharge occurs in the receptacle or the bushing inserted therein.

[Purpose of the invention] This invention solves the above-mentioned inconveniences and provides an X-ray tube device that prevents dew condensation from forming on the surface of the receptacle.

[Summary of the invention] This invention involves fixing an insulating cylindrical body around the receptacle in a tube housing container at a distance from the wall surface of the receptacle, and holding and fixing the cooling pipe to this cylindrical body at a distance from the wall surface of the receptacle. That's what happens.

As a result, the receptacle is maintained at a temperature close to that of the insulating oil during operation, and dew condensation on the wall surface facing the atmosphere is suppressed. Additionally, as the insulating oil comes into contact with the cooling pipe over a wide area, cooling of the insulating oil is also facilitated, ensuring safe and stable operation overall.

[Embodiment of the invention] An embodiment of the invention will be described below with reference to FIG.

Components that are the same as those in FIG. 1 are designated by the same reference numerals, and their explanations will be omitted. In the anticathode section, electrons emitted from the ring-shaped filament cathode 14 cross over the end (left side in the figure) of the cylindrical Wehnelt electrode 25 and collide onto the target 13. The metal vacuum envelope 26 and the beryllium X-ray emission window 15 are electrically grounded together with the container 17. The inner surface of the container 17 is lined with a lead plate 27 for X-ray shielding. The refrigerant, that is, the cooling water, is made to flow as shown by the arrow.

Now, on the outer periphery of the receptacle, a first insulating cylinder 28 is installed apart from the outer peripheral wall of the receptacle, and a spiral cooling pipe 21 is arranged around it.
is located. That is, a predetermined distance G is formed between the receptacle and the first insulating cylinder. A second insulating cylindrical body 29 is disposed outside the second insulating cylinder 29 with one end fixed to a part of the container. Although not shown, both insulating cylinders 28 and 29 are formed with a plurality of through holes for oil circulation so that insulating oil can flow therethrough. Note that the reference numeral 30 in the figure represents a connection terminal that is electrically connected to a bushing of an external electrical circuit inserted into the receptacle.

Although the above embodiment has a structure in which a pair of first and second insulating cylindrical bodies are arranged doubly and a cooling pipe is arranged between them in a sandwich-like manner, the structure is not limited to this. Only one of the two insulating cylinders is provided, and a spiral cooling pipe is connected to it.
A structure may be adopted in which the receptacle is held without contacting the outer circumferential wall of the receptacle.

[Effects of the invention] With this invention having the above configuration, since the cooling pipe is reliably separated from the wall of the receptacle, the receptacle part is not kept at a lower temperature than other parts during operation, and the receptacle part is not kept at a lower temperature than other parts. There is almost no condensation on the walls. Therefore, deterioration of withstand voltage characteristics is suppressed. Furthermore, since the cooling pipe does not touch the receptacle, the effect of suppressing discharge inside the container is increased. Furthermore, the contact between the cooling pipe and the insulating oil increases, and if holes are provided in the insulating cylinder for oil circulation, the oil in contact with the cooling pipe will be efficiently cooled, and natural convection will also occur, resulting in the overall As a result, cooling of the equipment is increased. As described above, according to this invention, deterioration of the withstand voltage performance of the receptacle portion is suppressed, the cooling efficiency of the entire device is increased, and safe and stable operation is ensured.

[Brief explanation of drawings]

[FIG. 1 is a vertical sectional view showing a conventional structure, and FIG. 2 is a vertical sectional view showing an embodiment of this invention. 14... cathode, 12... anticathode (anode) block, 17... tube housing container, 18... high voltage receptacle, 21... cooling pipe, 28, 29... insulating cylinder.

Claims (1)

[Scope of claims for utility model registration] (1) An X-ray tube having a cathode and an anticathode, and
a tube-accommodating container that accommodates at least a portion of the wire tube; and a cylindrical high-voltage receptacle having a connection terminal that is attached to protrude inwardly from a portion of the wall of the container and that is electrically connected to the anticathode. , an insulating cooling pipe penetrating a part of the wall of the container and spirally wound around the receptacle to circulate a coolant to the anticathode of the X-ray tube; An X-ray tube device characterized in that an insulating cylinder is provided on the outer periphery of the receptacle to support the cooling pipe at a distance from the outer peripheral wall of the receptacle. (2) The scope of the utility model registration claim, in which the inside of the pipe container is filled with insulating oil, and the insulating cylinder is provided with oil flow holes that allow the insulating oil to flow between the receptacle and the cooling pipe. The X-ray tube device according to item 1. (3) The X-ray tube device according to claim 1, wherein the insulating cylinders are provided in pairs on the inside and outside of a spiral cooling pipe with the cooling pipe sandwiched therebetween.