JPH08237008A - Waveguide with inductive rod - Google Patents

Abstract

PURPOSE: To prevent the deterioration in the electric characteristic by providing an inductive taper rod whose one end has a larger diameter and whose other end has a smaller diameter and a mount hole to which the inductive rod is inserted to the waveguide so as to secure and facilitate the mount of the inductive rod. CONSTITUTION: The inductive rod 2 is made of a conductive material formed into a rod and tapered by forming one end 2a to have a larger diameter and the other end 2b to have a smaller diameter. Furthermore, throughholes 3 are made at positions opposed to each other on inner walls of the waveguide main body 1 and used for a mount hole of the inductive rod. That is, the throughhole 3a in the throughholes 3 opposed to each other has a diameter to which an end of the inductive rod 2 with a larger diameter is press-fitted and the other throughhole 3b in the throughholes 3 opposed to each other has a diameter to which an end of the inductive rod 2 with a smaller diameter is press-fitted and the inductive rod 2 is press-fitted in the throughhole 3. Then the rod side 2b of the inductive rod 2 is inserted from the larger diameter side hole 3a of the throughhole 3 and the thin diameter side 2b is press-fitted to the thin diameter hole 3b. Simultaneously the larger diameter side 2a of the inductive rod 2 is press-fitted to the larger diameter hole 3a of the throughhole 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a waveguide having an inductive rod which functions as an inductive circuit element in the tube,
In particular, the present invention relates to a waveguide with an inductive rod, which allows easy and reliable attachment of the inductive rod and does not deteriorate electrical characteristics even when the inductive rod is provided.

[0002]

2. Description of the Related Art A waveguide used as a transmission line for microwaves or the like has conventionally been provided with an inductive rod which functions as an inductive circuit element in order to have an inductive receptor. This type of waveguide with an inductive rod is generally guided by fitting an inductive rod formed of a conductive member in a rod shape into mounting holes formed at positions opposite to each other in the waveguide wall. It has a structure installed inside the pipe.

A conventional waveguide with an inductive rod will be described below with reference to the drawings. 3A and 3B show a conventional waveguide with an inductive rod, in which FIG. 3A is a schematic perspective view, and FIG.
FIG. 4 is a side sectional view of a main part. As shown in these figures, in the conventional waveguide 10 with an inductive rod, the inductive rod 20 is formed in a T-shaped vertical cross section having a step in which one end side 20a is formed to have a larger diameter than the other end side 20b. At the same time, through holes 3 are formed in the tube walls of the waveguide 10 that face each other as mounting holes for the inductive rod 20 in such a size that each end of the inductive rod 20 can be press-fitted.
0 (large diameter side 30a, small diameter side 30b) was provided, and the inductive rod 20 was press-fitted into the through hole 30 to be fixed and contacted.

However, such a conventional waveguide with an inductive rod has the following problems. That is, since the inductive rod had a stepped shape with a T-shaped cross section,
The stepped surface of the large-diameter portion of the inductive rod may sometimes protrude from the inner wall surface of the waveguide toward the hollow portion of the waveguide.

Generally, in a waveguide, if the inner wall surface of the waveguide is not the same, the electrical characteristics are deteriorated. Therefore, the inner wall surface of the waveguide and the stepped surface of the large diameter portion of the inductive rod become so-called flush. Need to be Therefore, in order to match the inner wall surface of the waveguide with the stepped surface of the large diameter portion of the inductive rod and maintain the electrical characteristics, insert a jig into the waveguide when attaching the inductive rod, and Perform press fitting work so that the stepped surface of the rod does not protrude from the inner wall surface of the waveguide, or the thickness and inductiveness of the waveguide so that the inductive rod can be pressed in based on the outer surface of the waveguide. The length of the large diameter part of the rod had to be created with strict accuracy.

Therefore, the conventional waveguide with an inductive rod is
The work of mounting the inductive rod is complicated, and strict dimensional accuracy matching is required between the inductive rod and the mounting hole of the waveguide, which causes disadvantages and inconveniences in terms of manufacturing cost.

Therefore, in order to solve the problem of such a conventional waveguide with an inductive rod, in order to solve the problem, the actual construction of Sho 62-158.
In the publication of 901, an inductive rod is formed in a tubular shape, and a spherical body having a diameter slightly larger than the inner diameter of the inductive tube is press-fitted from both end openings of the inductive tube, so that the inductive tube is guided inside the waveguide. A waveguide to be installed in the above has been proposed.

[0008]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention 62-15
According to the waveguide of Japanese Patent No. 8901, since a tubular inductive rod having no step is used, the waveguide between the inductive rod and the mounting hole as in the conventional waveguide with an inductive rod is provided. The problem that strict dimensional accuracy is required can be solved.
Also, the work of attaching the inductive rod is simpler than that of the conventional one, because only the inductive rod and the sphere are press-fitted.

[0009] However, this actual development Sho 62-1589
In the waveguide of the '01 publication, the inductive rod has to be tubular and a sphere for press-fitting is additionally required, so that the structure becomes complicated and there is a problem that the cost increases due to an increase in the number of parts. . Further, since the work procedure for press-fitting the sphere into the tubular inductive rod is increased, the number of steps is increased and the cost is increased in mass production of the product. Furthermore, this waveguide cannot be fixed with a standard tool because it is difficult to fix the sphere in a fixed position by hand when attaching the inductive rod. However, there is a problem in that a large amount of equipment costs are required.

The present invention has been proposed in order to solve the problems of the prior art as described above, and the inductive rod can be manufactured and attached to the waveguide easily and surely. It is an object of the present invention to provide a waveguide with an inductive rod in which electrical characteristics are not deteriorated even by providing the inductive rod.

[0011]

To achieve the above object, a waveguide with an inductive rod according to claim 1 of the present invention comprises a waveguide body and a rod-shaped member formed of a conductive member.
An inductive rod formed in a tapered shape with one end having a large diameter and the other end having a small diameter, and the inductive rod, which is bored at a position opposite to each other on the inner wall of the waveguide main body, is fitted and installed. Hole,
One is a mounting hole having a diameter that allows the large-diameter end of the inductive rod to be press-fitted, and the other is a mounting hole that is formed to have a diameter that allows the small-diameter end of the inductive rod to be press-fitted.

In the waveguide with an inductive rod according to a second aspect of the present invention, the inductive rod has a cylindrical tapered shape.

Further, in the waveguide with an inductive rod according to a third aspect of the present invention, the waveguide body is formed by joining two vertically divided pieces.

[0014]

According to the waveguide with an inductive rod of the present invention having the above-mentioned structure, the inductive rod of the inductive rod is inserted by inserting the thin diameter side of the inductive rod from the large diameter hole side provided in the waveguide. Since both ends can be press-fitted and fixed into the through holes of the inner wall surface of the waveguide facing each other, the inductive rod can be easily and surely attached, and the inductive rod has no step or the like. The electrical characteristics of the waveguide are not impaired.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the waveguide with an inductive rod of the present invention will be described below with reference to the drawings. 1A and 1B show an embodiment of a waveguide with an inductive rod according to the present invention. FIG. 1A is a schematic perspective view, and FIG. 1B is a side sectional view of a main part. In these figures, reference numeral 1 denotes a waveguide main body, which has a rectangular tubular shape, and flanges for joining are formed at both ends in the longitudinal direction.

Reference numeral 2 denotes an inductive rod, which is a conductive member formed in a rod shape and has a tapered shape in which one end side 2a is formed in a large diameter and the other end side 2b is formed in a small diameter. This inductive rod 2
In the present embodiment, as shown in FIG. 1, it has a cylindrical taper shape, but the present invention is not limited to this, and it may be a taper shape such as a quadrangular pillar shape or a polygonal pillar shape. The material of the inductive rod 2 is not particularly limited as long as it has conductivity, but stainless steel is used in this embodiment.

Reference numeral 3 is a through hole, which is formed in the inner wall of the waveguide main body 1 at a position facing each other, and serves as a mounting hole for the inductive rod. That is, the through holes 3 facing each other are the holes 3 on one side.
a has a diameter such that the end of the large diameter side 2a of the inductive rod 2 can be press-fitted, and the other hole 3b has a small diameter side 2b of the inductive rod 2.
Is formed to have a diameter such that it can be press-fitted, and the inductive rod 2 is laid between the holes 3a and 3b in a press-fitted state.

The diameters of the through hole 3 and the inductive rod 2 are determined by the taper angle and length of the inductive rod 2, the distance between the inner walls of the waveguide body 1 which face each other, or the inductive rod 2 is press-fitted. It is calculated in advance based on the angle and the like so that the two do not rattle each other.

In the case shown in FIG. 1, the through hole 3 is formed in the tube wall of the waveguide body 1 by cutting because the body of the waveguide body 1 is integrally formed. It is not limited to this. For example, as shown in FIG. 2, it is possible to cast one obtained by dividing the waveguide main body 1 into upper and lower parts and join them into a single waveguide. 3 is also formed by casting instead of cutting.

In the case of casting in this way, the waveguide body 1
Also, the through holes 3 can be formed more easily, and the manufacturing cost can be reduced. In addition, the through hole 3 is formed by this casting.
2B, the through hole 3 has a tapered shape due to the relationship with the mold, but each through hole 3a, 3
If b has a small diameter inside the waveguide, the inductive rod 2 is in a press-fitted state, so there is no problem.

Next, a method of assembling the waveguide with the inductive rod of the present embodiment having the above structure will be described.
First, the small diameter side 2b of the inductive rod 2 is inserted from the large diameter hole 3a side of the through hole 3 of the waveguide body 1, and the small diameter side 2b of the inductive rod 2 is inserted into the small diameter hole 3b of the through hole 3. Press into. By doing so, at the same time, the large diameter side 2a of the inductive rod 2 is pressed into the large diameter hole 3a of the through hole 3. This completes the attachment of the inductive rod 2 to the waveguide body 1.

As described above, according to the waveguide with the inductive rod of this embodiment, the small diameter side 2b of the inductive rod 2 is inserted from the side of the large diameter hole 3a provided in the waveguide body 1. With this, both ends of the inductive rod 2 can be press-fitted and fixed into the through holes 3 of the inner wall surface of the waveguide body 1 which face each other, so that the inductive rod 2 can be easily and surely attached. Further, since the inductive rod 2 has no step or the like, the electrical characteristics of the waveguide body 1 are not impaired.

According to the waveguide with the inductive rod of this embodiment, the inductive rod 2 can be press-fitted at any position of the waveguide body 1 with respect to the axial direction of the inductive rod 2. It will be possible.
That is, since the inductive rod 2 has a taper shape without steps or the like, it can function as an inductive circuit element as long as the inductive rod 2 is pressed into the through hole 3 regardless of the axial position. . Therefore, like the conventional waveguide with an inductive rod, the dimensional accuracy of the wall thickness with the waveguide may be loose to some extent, and a positioning jig or the like is not necessary.

[0024]

As described above, according to the waveguide with an inductive rod of the present invention, the inductive rod can be attached easily and surely, and the electrical characteristics can be obtained by providing the inductive rod. It is possible to prevent deterioration.

[Brief description of drawings]

1A and 1B are schematic perspective views and FIG. 1B is a side sectional view of an essential part, showing an embodiment of a waveguide with an inductive rod according to the present invention.

2A and 2B show another embodiment of the waveguide with an inductive rod according to the present invention, FIG. 2A is a schematic perspective view, and FIG.

3A and 3B show a conventional waveguide with an inductive rod, FIG. 3A is a schematic perspective view, and FIG.

[Explanation of reference numerals] 1 ... Waveguide main body 2 ... Inductive rod 3 ... Through hole

Claims (3)

[Claims] 1. A waveguide main body, a bar-shaped member formed of a conductive member, wherein one end has a large diameter and the other end has a small-diameter tapered shape, and the waveguide main body. Were drilled at the opposite positions on the inner wall of the
A hole into which the inductive rod is fitted and installed, one of which has a diameter capable of press-fitting a large-diameter end portion of the inductive rod, and the other of which has a diameter capable of press-fitting a small-diameter end portion of the inductive rod. A waveguide with an inductive rod, comprising: a mounting hole formed in the. 2. The waveguide with an inductive rod according to claim 1, wherein the inductive rod has a cylindrical taper shape. 3. The waveguide with an inductive rod according to claim 1, wherein the waveguide body is formed by joining two vertically divided pieces.