DE6946926U - ROENTGE PIPE WITH METAL PISTON. - Google Patents

Description

"X-ray tube with metal piston. ¹¹

The innovation relates to an X-ray tube with a metal piston, which is particularly suitable for high Voltages (up to 500 kV) is suitable.

The German patent specification 924 940 discloses an X-ray tube with a metal piston and one on a porcelain insulator fixed cathode known in which the connection between the porcelain insulator and the metal kolban is made by a glass collar that is fused to a metal ring.

Construction, which has the advantage of greater stability and the elimination of disruptive glass wall charges compared to tubes *, χ with glass bulbs, has not yet been approved. One reason for this may be that the high-voltage capability of the porcelain insulation is low compared to certain synthetic resins. More recently, however, ceramic insulators have become available, on the upper and lower ends of which metal rings can be soldered in a vacuum-tight manner. Hereby loading _f knew arrangement can be realized. A specialist part of the known

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However, the construction is that the high-voltage plug to be inserted into the insulator exactly matches the shape of the Isolator must be adapted because subsequent processing is not possible. The external dimensions of a high-voltage connector depend both on the connector system of the respective manufacturer and on the tension for which it is intended. An X-ray tube constructed according to this principle is therefore only available can be used in conjunction with a specific high-voltage generator.

The innovation is based on the task of an isolator construction indicate which on the one hand has sufficient high voltage strength and on the other hand for the Connection of various high-voltage plugs is suitable. For an X-ray tube with one mostly off Netall existing tubular flasks, in which at least one electrode (cathode or anode) is connected to one in the Tubular piston protruding ceramic insulator is attached, which is connected to the tubular piston in a vacuum-tight manner is, this object is achieved according to the invention that in the ceramic insulator with a rubber coating provided replaceable synthetic resin insulator is used, which is used to accommodate the high-voltage plug.

Me innovation is explained in more detail with reference to an embodiment shown in the drawing. Bs show:>

the cathode-side part of an X-ray tube of the innovation and j Vig. 2 the anode-side part of a modern HBK tc * iir Ohr e.

HIt 1 is the generally cylindrical metal piston of the m beeichnet. To the lower part 5 de3 metal iet a ring 2 is welded, with a in the

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Metal piston protruding, hereby concentrically arranged conical ceramic eluator is soldered. Using suitable materials and suitable welding processes, the Kerejnik isolator and Establish a vacuum-tight connection with the metal piston.

A ring is soldered to the narrow end of the ceramic insulator iac and welded to a plate 6 in a vacuum-tight manner. The ring 7 and the plate 6 carry all the cathode construction of which - since it is of no further interest in this context - only the outer cathode sleeve is indicated. The power supply lines for the cathode 2 are routed through the plate 6 in a manner not shown in detail.

. The conical ceramic insulator 3 has an essentially constant wall thickness, so that there is also a conical recess in which an insulator 8 is omitted Synthetic resin - in particular Araldite - is used. A rubber coating 9 is vulcanized onto the insulator θ, in connection with a geeiggoten Vaseline or Grease ensures that with «linseteeη Α · β synthetic resin insulator between this and the ceramic insulator Air bubbles become trapped.

The synthetic resin insulator has a flange 11 which is medium « Screws (not shown) on dsm to the metal piston 1 welded stop 4 can be fastened so that the synthetic resin insulator in the koniecbe recess of the Ceramic insulator can be pressed into it.

The synthetic resin insulator in turn also has one

conical recess 10 into which the not closer

/ The actual high-voltage plug shown is pushed

6146926-22. ^ TT

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The high voltage connection between the plug and the cathode - in this case one cathode for two Optionally switchable filaments (double focus tube) - takes place via a contact ring 12 designed as an expanding sleeve and an inner contact ring 13 and a Contact pin 14. The contact with the actual cathode leads routed through the plate 6 is established at in In a manner not shown in more detail, similar to a low-voltage plug by pressing in the Resin insulatorβ made in the ceramic insulator.

High electrical field strengths at the sharp edges of the electrodes 12, 13, 14 are expediently thereby avoided that the intended recess in the synthetic resin insulator is metallized, so that a results in a field-free space around the electrodes.

If a high-voltage plug with other dimensions is to be used, the flange 11 is released and the Ceramic insulator used - possibly together with the flange - exchanged for an insulator suitable for a high-voltage switch. Here can if necessary after removing a plastic stopper 21, the expansion sleeve 12 can be pulled out, so that the electrodes 12, 1-3, 14 in the event of any damage • Can be exchanged.

In the known X-ray tube according to German Patent 924 940, only the cathode is on one . Porcelain insulator attached, while the anode and the metal bulb are at ground potential. The anode can be easily cooled with water.

If, however, the anode by means of a ceramic insulator

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is attached to the metal piston and leads to high voltage compared to this, the cooling causes difficulties. Fig. 2 shows a solution to this problem. The anode-side insulator has essentially the same shape as the insulator in FIG. 1, which is why the same reference numerals are used. The coolant, usually Ul, is fed through a hole 15 in the synthetic resin insulator, if necessary, the hole could also be made in the ceramic insulator - a pipe 16 and a sieve 18 below the copper mass 17 carrying the anode focal point, after which it is passed through another Sisb 19 past the side walls of the anode body and emerges again via a further bore 20.

PROTECTION CLAIMS!

Claims (3)

PROTECTION CLAIMS; 10 X-ray tube with a mostly metal tube piston with at least one electrode (anode or cathode) is attached to a ceramic insulator which projects into the tubular piston and which is connected to the tubular piston is connected vacuum-tight, characterized in that in the ceramic insulator (3) with a rubber coating (9) provided, replaceable synthetic resin isolator (8) is pin set, which is used to accommodate a high-voltage plug serves. 2.) X-ray tube according to claim 1, characterized in that that the connections for the high voltage protrude into the synthetic resin insulator. 3.) X-ray tube according to claim 2, characterized in that that the ends (12, 13, H) of the connections for the high voltage protrude into a cavity in the synthetic resin insulator (8) which is metallized on its surface. Λ. , X-ray tube with a largely metal Tubular piston .., in which the anode is connected to one in the Tubular piston protruding T'aramic insulator attached i.yt, which is "vacuum-tight" connected to the tube piston, in particular according to one of the preceding claims, characterized in that in the synthetic resin or in the ceramic insulator Bores (15, 20) are provided through which an anode coolant is passed.