JPH04147536A - Manufacture of traveling-wave tube - Google Patents

Abstract

PURPOSE:To assemble a delay circuit of a traveling-wave tube without using the adhesive agent for fixing a spiral wire and dielectric member supporting rods by supporting a core, which is narrower than an inner diameter of an electron beam passage made of spiral wire, and both ends of the dielectric supporting rods, and fixing the spiral wire and the dielectric member supporting rods with a cylindrical member, and heating a main frame of the traveling- wave tube and while inserting it. CONSTITUTION:A step cylindrical member 3 with groove is removed from a core 1, and a spiral wire 7 is installed to the core 1 till it abuts on a cylindrical member 2 with groove, and next, dielectric member supporting rods 8 are installed to a groove of the cylindrical member 2 with groove, and a cylindrical member 6 is slid for fixation in the periphery of the spiral wire 7 and the dielectric member supporting rods 8. Next, the cylindrical member 6 is taken into a small diameter part of the step cylindrical member 3 with groove, and the inner diameter thereof is installed to the core 1, and is pressed till the dielectric member supporting rods 8 abuts on the bottom of the groove 4 and clearances between both ends of the dielectric member supporting rods 8 and the cylindrical member 2 with groove and the groove 4 of the step cylindrical member 3 with groove. Thereafter, the cylindrical member 6 is slid in the periphery of the spiral wire 7 and the dielectric member supporting rods 8, and the step cylindrical member 3 with groove and the core 1 are fixed by a locking screw 5 to perform sub-assembly of a delay circuit. A main frame 9 of the traveling-wave tube is heated by a heating device at about 500 deg.-800 deg.C in the atmosphere of H2N2 gas, and while the core 1 is inserted.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates primarily to the manufacture of traveling wave tubes used as microwave amplifiers.

[Conventional technology]

A conventional method for manufacturing a slow wave circuit of a traveling wave tube - An example is a slow wave circuit in which a screw 7 is attached to an 8 rod 1 and a dielectric support rod 8 is bonded with an adhesive 10 to the outer periphery of the screw 7, as shown in FIG. The traveling wave tube body is heated to about 500° C. to 800° C., and the slow wave circuit subassembly is inserted into the aperture of the traveling wave tube body 9.

At this time, the outer diameter of the wave carrier circuit subassembly is 0.01-0.03 larger than the diameter of the traveling wave tube main body 9 at room temperature.

After insertion, the adhesive 10 is removed by thermal decomposition in a hydrogen furnace or immersed in an organic solvent, and the eight rods 1 are pulled out from the spiral. W with 7 like this! Lock 7L+Left P-barge Naruzuka o1,1 Scream 1- is completely fixed via the tower link support rod 8 to form a slow wave circuit.

[Problem to be solved by the invention]

In the conventional slow wave circuit manufacturing method described above, the slow wave circuit subassembly, which combines the spiral wire 7 and the dielectric support rod 8, is bonded with adhesive 10, so after inserting it into the traveling wave tube main body 9, needs to be completely removed. This is because if the adhesive remains in the traveling wave tube, the gas generated from the adhesive will prevent normal operation. However, there is a problem in that it is quite difficult to completely remove the adhesive. In addition, as a manufacturing process of this slow wave circuit, a process of adhesively bonding the dielectric support rod 8 to the spiral wire 7 and a process of removing the adhesive are necessary, which increases the manufacturing cost and requires complete removal of the adhesive. However, there are drawbacks such as a decrease in yield due to the difficulty of processing.

[Means to solve the problem]

In the method for manufacturing a slow wave circuit of a traveling wave tube according to the present invention, the inner diameter portion of the spiral 7 corresponding to the electron beam path is 0.01 to 0.0.
The spiral wire 7 and the dielectric support rod 1 are cylindrical in shape and have a plurality of grooves 4 on the end surface. Position the support rod 8, and connect the spiral wire 7 and the dielectric support rod 8 with the cylindrical member 6.
is fixed, and the traveling wave tube main body part 9 is heated to approximately 500'' to 800°C and inserted.

〔Example〕

Next, the present invention will be explained with reference to the drawings.

Figure 1 shows spiral 7. This is a perspective view of the fixed parts of the slow wave circuit for inserting the slow wave circuit consisting of the dielectric support rod 8 into the traveling wave tube main body 9.
．． The cylindrical member 2 is fixed by welding or the like, and has a plurality of grooves 4 near the center thereof, into which one end of the dielectric support rod 8 is received. The outer diameter of this grooved cylindrical member is about 0.1 to 0.3 times smaller than the diameter of the traveling wave tube body so that it can pass through the diameter of the traveling wave tube body 90. Also, in the direction opposite to the plurality of grooves 4, there are also a plurality of grooves 4.
The inner diameter of the stepped cylindrical member 3 with 8 rods is 001 to 0.
The stepped cylindrical member 2 is approximately 1 mm larger in diameter, and the small diameter portion of the stepped cylindrical member 2 is 01 to 0.3 mm thinner than the diameter of the main body of the traveling wave tube, and the large diameter portion has a set screw May screw hole for fixing to the 8 rod l. Next, the cylindrical member 6 has an inner diameter that is slidably fitted to the outer diameter of the helix 7 on which the dielectric support rod 8 is attached. In order to provide spring properties to this cylindrical member, it is preferable that the end face be slotted or the outer periphery be cut, as shown in FIG.

Figure 2 is a perspective view of a slow wave circuit subassembly in which a spiral wire 7 and a dielectric support rod 8 are combined and fixed. 7 is attached until it touches the grooved cylindrical member 2, and then, while adjusting the circumference of the spiral 7, a dielectric support rod 8 is attached to the groove of the grooved cylindrical member 2, and the cylindrical member 6 is connected to the spiral 7 and the dielectric support. It is slidably fixed to the outer periphery of the rod 8.

Next, insert the cylindrical member 6 into the small diameter part of the grooved stepped cylindrical member 3 and attach it to the inner diameter 8 rod 1, so that the dielectric support rod 8 hits the bottom of the groove 4 and both ends of the dielectric support rod 8 are attached to the grooved cylindrical member. 2 and the grooved stepped cylinder 3 until there is no gap between them, then slide the cylindrical member 6 onto the outer periphery of the helix 7 and the dielectric support rod 8, and tighten the grooved stepped cylinder member 3 with the setscrew 5. 8. Fix the rod 1 and perform the slow wave circuit subassembly. FIG. 3 shows the traveling wave tube main body 9 heated at approximately 500 degrees in an H2N2 gas atmosphere using a heating device (not shown).
Heat to ~800°C and insert the 8 rod 1 by pulling it in the downward direction as shown in the insertion state diagram. At this time, the cylindrical member 6 remains in the upper part of the traveling wave tube main body 9, as shown in the drawing, when the spiral wire 7 and the dielectric support rod 8 are slid together on the outer periphery.

When the insertion is completed, loosen the set screw 5, pull out the rod 1 and the grooved member 2 in the same direction as the insertion, and pull out the grooved stepped cylinder 3 from inside the diameter of the traveling wave tube body 90 in the opposite direction to the insertion, and stop the cylindrical member 6. The removal slow wave circuit assembly is completed.

〔Effect of the invention〕

By adopting the traveling wave tube manufacturing method according to the present invention, it is possible to assemble the slow wave circuit of the traveling wave tube without using the adhesive 10 between the spiral wire 7 and the dielectric support rod 8 as in the prior art example. becomes possible. This can prevent various causes of deterioration caused by deterioration of the vacuum degree of the traveling wave tube due to incomplete removal of adhesive after insertion. Furthermore, the adhesion process and the removal process are unnecessary, making it possible to shorten the process and reduce costs.

[Brief explanation of the drawing]

FIG. 1 shows a perspective view of fixing parts for a spiral and a dielectric support rod in an embodiment of the method for manufacturing a slow wave circuit of a traveling wave tube according to the present invention. FIG. 2 shows a perspective view of one embodiment of the slow wave circuit subassembly of the present invention. FIGS. 3(a) and 3(b) show partial cross-sectional views of an embodiment of the method for manufacturing a traveling wave tube according to the present invention. FIGS. 4(a), 4(b), and 4(c) show perspective views of the cylindrical member and other components. Figure 5(a). (b) is a perspective view of a slow wave circuit subassembly showing an example of a conventional traveling wave tube manufacturing method, 1...8 rods, 2... grooved cylindrical member, 3...
... Grooved stepped cylindrical member, 4... Groove, 5.
... Set screw, 6 ... Cylindrical member, 7 ...
... Spiral wire, 8 ... Dielectric support rod, 9 ...
... Traveling wave tube body, 10... Adhesive, 11.
...Suriwari. Agent Patent Attorney Uchihara Uchihara Shokakuchu (a) No. 2 (b) (α) No.

Claims (1)

[Claims] A high-frequency circuit body for a traveling wave tube, in which a spiral made of metal, two or more magnetic poles and non-magnetic metal spacers are alternately brazed;
When manufacturing a traveling wave tube consisting of two or more dielectric support rods that support the spiral with respect to the high frequency circuit main body, a core metal 1 is inserted into the inner diameter of the spiral, and The dielectric support rods are arranged at equal intervals on the outer periphery of the grooved cylindrical member 2 and the grooved stepped cylindrical member 3, and the dielectric support rods are further fixed with the cylindrical member 6 to form a slow wave circuit subassembly. None, then heating the traveling wave tube body, then inserting the slow wave circuit subassembly into the heated high frequency circuit body, and then heating the core other than the spiral and dielectric support rod. A method for manufacturing a traveling wave tube, characterized in that a slow wave circuit is formed by removing the metal 1, the grooved cylindrical member 2, the grooved stepped cylindrical member 3, and the cylindrical member 6.