JP6333090B2 - Waterproof structure of split waveguide - Google Patents

Description

  The present invention relates to a waterproof structure for a split-type waveguide, and more particularly to a structure that can obtain high reliability in waterproofing a connecting portion.

  Conventionally, as a circuit for high-frequency mode conversion or frequency conversion, there has been a waveguide that employs a special structure inside, for example, a continuous or stepped protrusion or a thin plate-like structure is guided. Since it is formed inside the tube, a divided waveguide obtained by dividing the waveguide is employed.

  That is, some of the special structures described above can be inserted and fixed into the waveguide from the outside. However, if the dimensional error in assembly is unacceptable in terms of frequency characteristics, the waveguide Is divided into two, and after applying precision machining directly to both or one of the waveguide inner wall portions of these divided bodies (divided pieces), a method of abutting and fixing both divided bodies is adopted. This fixing is performed by welding or screwing of a bolt and a nut.

  As an example of such a divided waveguide, there is a corrugated waveguide type polarizer, which, as described in Patent Document 1 below, includes a plurality of continuous rectangular protrusions called corrugated in the tube axis direction of the waveguide. It is provided over. Such a plurality of continuous protrusions are disposed in the waveguide and cannot be integrally formed in the waveguide by die casting or the like, and thus may be a split waveguide.

JP 2007-006237 A WO2008 / 108388 A1 publication

  As described above, in the split waveguide, the abutting part of the split body and the connection part to the other members of the split waveguide are fixed by welding, bolts, nuts, etc. Therefore, it is necessary to waterproof the abutting portion and the connecting portion. In this waterproofing, it is desirable to have a structure having a high waterproof effect.

  That is, when both split bodies are welded and fixed in the assembly of the split-type waveguide, it is difficult to change or finely adjust the projection shape by reworking after the welding, and reworking and adjustment It is not desirable that no cut-and-try can be done for. For this reason, it is preferable to fix the split waveguides easily by fixing them, for example, by screwing bolts and nuts so that rework and adjustment are easy. A highly effective structure is required.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a waterproof structure for a split-type waveguide that can provide a high waterproof effect at the abutting portion and the connecting portion.

In order to achieve the above object, a waterproof structure for a split-type waveguide according to a first aspect of the present invention includes a plurality of divided bodies obtained by dividing a waveguide, and respective abutting surfaces of the plurality of divided bodies. A first groove provided along the waveguide, a second groove provided on an outer periphery of the waveguide opening at the end of each divided body, and in communication with the first groove; and the first groove A waterproof packing that fits into each of the groove and the second groove, wherein the width of the second groove is larger than the width of the first groove.
The invention according to claim 2 is characterized in that the waterproof packing for the first groove and the waterproof packing for the second groove are integrally formed.

  According to said structure, waterproofing can be aimed at by the packing attached to the 1st groove | channel and the 2nd groove | channel, and packing (for example, O-ring) arrange | positioned at a 2nd groove | channel is this 2nd groove | channel. The first groove communicating with the groove can also be pressed, but since the width of the first groove is smaller than the width of the second groove, the O-ring deforms so that the first groove is firmly attached. Thus, a highly waterproof state can be obtained.

According to the waterproof structure of the split-type waveguide of the present invention, the packing is securely adhered by the packing disposed in both the first and second grooves and also in the communication portion between the second groove and the first groove. By doing so, a high waterproof effect can be obtained at the abutting portion of the divided body and the connecting portion of the divided waveguide. Accordingly, it is possible to obtain an effect of facilitating reworking and adjustment of a structure such as a corrugate inside the waveguide by adopting a fixing method that makes it easy to assemble and release the divided body.
Further, by integrating the waterproof packing of the first groove and the waterproof packing of the second groove, there is an advantage that the waterproof effect can be enhanced as compared with the case where it is separated.

It is a perspective view which shows the division | segmentation type | mold waveguide which concerns on the Example of this invention, and its waterproof structure. It is a perspective view which shows the structure of the waterproof packing of an Example. FIG. 1A is an overall view, FIG. 2B is an enlarged view of a groove portion, and FIG. 2C is an enlarged view of a groove portion having the same width. FIG.

  FIG. 1 shows a split waveguide according to an embodiment and a waterproof structure thereof, and FIG. 2 shows a waterproof packing. The embodiment is a corrugated polarizer. In FIG. 1, the divided waveguide is a circular waveguide, and is composed of divided bodies (pieces) 1 and 2 that are divided into two in the circumferential direction. Corrugations 3 are formed on the waveguide upper wall and the waveguide lower wall inside the divided body 2.

  Rectangular (or circular) first grooves 4a and 4b are formed along the waveguide on the left and right abutting surfaces of the waveguide for connecting the divided bodies 1 and 2 described above. Further, flanges 5 as joints are provided at both ends of the divided bodies 1 and 2, and annular second grooves 6 a and 6 b are formed on the outer surface of the waveguide opening of the flange 5. A packing 7 having a rectangular radial cross section (may be circular) is inserted into the first grooves 4a and 4b, and an O-ring 8 having a circular radial cross section is inserted into the second grooves 6a and 6b. Is inserted.

  In the embodiment, as shown in FIG. 2, the packing 7 and the O-ring 8 are integrally formed in a connected state. The second grooves 6a and 6b have a semicircular cross section in the radial direction, and a semicircular groove formed on the flange of another member to which the divided waveguide is connected is the second groove 6a and 6b. The O-ring 8 is configured to be pressed by facing the grooves 6a and 6b.

FIG. 3 shows the relationship between the first groove and the second groove. When the divided bodies 1 and 2 are connected, the first groove 4 is formed by the first grooves 4a and 4b. In this embodiment, the width d ₂ of the _second groove 6 is made larger than the width d ₁ of the first groove 4 (d ₁ < d ₂ ).

  According to such an embodiment, the packing 7 is fitted into the first grooves 4a and 4b formed on the abutting surfaces of the divided bodies 1 and 2, and the second grooves 6a and 6b formed on the flange 5 are fitted. While the O-ring 8 is fitted, the divided bodies 1 and 2 are coupled by coupling bolts and nuts, etc., and the flange 5 is coupled to connecting parts such as flanges of other members by bolts and nuts to guide the wave. Tubes are connected and placed in the circuit.

  The packing 7 is sandwiched between the first grooves 4 (4a, 4b), and the O-ring 8 is sandwiched between the second grooves 6 (6a, 6b) and grooves of other members and compressed. However, the packing 7 and the O-ring 8 are sized so as to be deformed by compression and to obtain an optimum crushing rate. In particular, the O-ring 8 has a slightly smaller diameter in consideration of the convenience of mounting, and it is preferable that the O-ring 8 is fitted into the groove by applying a pulling force.

According to the embodiment, as shown in FIGS. 2A and 2B, the width d2 of the _second groove 6 is larger than the width d1 of the _first groove 4, The crushing rate of the O-ring 8 can be kept uniform over the entire circumference by the compressive force from the flange surface during connection. That is, since the hole of the small first groove 4 is opened in the second groove 6, the degree of adhesion to the first groove 4 is increased without uneven compression stress, The waterproof performance and reliability at the flange connecting portion can be improved.

On the other hand, for example, as shown in FIG. 2C, consider a case where the width d ₁ of the _first groove 4 is the same as the width d ₂ of the second groove 6 (d ₁ = d ₂ ). In this case, the crushing rate (deformation) of the O-ring 8 in the first groove 4 becomes small, the compressive stress becomes nonuniform, and the degree of adhesion becomes low.

  Furthermore, in the embodiment, since the packing 7 and the O-ring 8 are integrated, there is no gap between the packing 7 and the O-ring 8 in the communication portion between the first groove 4 and the second groove 6. Since the degree of adhesion between the packing 7 and the O-ring 8 with respect to the groove is increased, waterproofing is performed satisfactorily.

In the embodiment, the present invention is applied to a corrugated polarizer, but it can be applied to a split-type waveguide having another structure.
Moreover, although the example divided | segmented into 2 was shown, it is applicable also when dividing | segmenting into 3 etc.

1, 2 ... divided body, 4, 4a, 4b ... first groove,
5 ... flange, 6, 6a, 6b ... second groove,
7 ... packing, 8 ... O-ring.

Claims (2)

A plurality of divided bodies obtained by dividing the waveguide;
A first groove provided along the waveguide on each abutment surface of the plurality of divided bodies;
A second groove provided on the outer periphery of the waveguide opening at the end of each of the divided bodies and communicating with the first groove;
A waterproof packing that fits into each of the first groove and the second groove,
A waterproof structure for a split-type waveguide, wherein the width of the second groove is larger than the width of the first groove.   2. The waterproof structure for a split waveguide according to claim 1, wherein the waterproof packing for the first groove and the waterproof packing for the second groove are formed integrally.

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