JPS5931883B2 - Impregnation method for tapered waveguide - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of impregnating a tapered waveguide.

The conventional method of impregnating a tapered waveguide is to tightly wrap an insulated copper wire 2 around a core 1 as shown in FIG. Wrap in sequence.

Next, for the above-mentioned various windings, the core metal is covered with the exterior steel pipe 5, an impregnation jig 6 is attached to each end of the core metal, and an epoxy resin 8 is vacuum impregnated from the resin injection lower of the jig.

However, in this conventional impregnation method, the epoxy resin 8 is impregnated between the winding material surface 9 and the steel pipe 5, so in thick areas, the inner dimensions of the tapered waveguide may deviate from the designed value due to heat shrinkage, resulting in an unnecessary mode. The disadvantage is that the amount generated increases.

In order to solve the above-mentioned drawbacks, the present invention proposes a material with a low heat shrinkage rate and an inner surface having almost the same shape as the coating layer, which is made by sequentially winding an insulated copper wire, a lossy material, and a mechanical reinforcing material around a tapered mandrel. An exterior steel pipe is placed over the mandrel through a cylindrical spacer, an impregnating jig is attached to both ends of the pipe, and an epoxy resin is injected into the coating layer from the epoxy resin inlet of the impregnating jig. This is a method of impregnating wave tubes.

To explain this in detail with reference to the drawings, FIG. 2 shows an embodiment thereof, where the same reference numerals as in FIG. It is a spacer that forms a shape and is made of a material with a low thermal shrinkage rate, such as FRP or epoxy resin with print powder, asbestos powder, etc., and after fitting it on the covering layer 3, an exterior covering is placed on top of it. The steel pipe 5 is fitted, and the epoxy resin 8 is injected into the gap between the winding surface 9 of the coating layer 3 and the spacer 10, and between the spacer 10 and the steel pipe 5 through a jig 6 and an injection lower provided on the steel pipe 5 to impregnate the epoxy resin 8. Impregnate to a uniform thickness.

Note that the cylindrical spacer may be a single piece or a two-piece piece.

Comparing the solid spacer of the present invention and the heat shrinkage during curing of conventional impregnated epoxy resin, it is possible to reduce heat shrinkage by inserting a pre-hardened spacer.

The method for impregnating a tapered waveguide according to the present invention uses a spacer made of a material with a low heat shrinkage coefficient and having an inner surface approximately the same shape as the coating layer around the tapered mandrel. Since this is a method of injecting and impregnating the resin, it is possible to make the outer epoxy resin layer thin and uniform, thereby reducing the deviation of the dimensions of the tapered waveguide's inner surface from the design value due to thermal contraction of the epoxy resin, and thus eliminating unnecessary modes. It is possible to easily manufacture a tapered waveguide that generates a small amount of .

[Brief explanation of the drawing]

The drawings show an embodiment of a method for impregnating a tapered waveguide with epoxy resin, and FIG. 1 shows a conventional method;
FIG. 2 shows the method of the present invention. 1 is a tapered mandrel, 2 is an insulated copper wire, 3 is a lossy material for absorbing unwanted modes, 4 is a structural reinforcement material, 5 is a steel pipe for exterior use,
6 is an impregnation jig, 7 is a resin injection hole, 8 is an epoxy resin, 1
0 is a cylindrical spacer.

Claims (1)

[Claims] 1. A cylindrical spacer made of a material with a low heat shrinkage coefficient and a cylindrical armored steel pipe having an inner surface of approximately the same shape as the coating layer made by sequentially winding an insulated copper wire, a lossy material, and a mechanical reinforcement material around a tapered core. A method for impregnating a tapered waveguide with an epoxy resin, which is characterized in that the coating layer is impregnated with an epoxy resin by inserting the epoxy resin into the sheathing steel pipe, and then injecting the epoxy resin from the epoxy resin injection port of the sheathing steel pipe.
j