JPS6021481B2 - Waveguide connection device - Google Patents

Description

[Detailed description of the invention] The present invention changes the propagation direction of radio waves to create a waveguide and other waveguides.
It relates to a waveguide connecting device that connects a waveguide and an oscillator, or a waveguide and a receiver, etc.
It is suitable for use in various types of detectors, which are the main parts of the detector.

A detector that has a waveguide as its main part, such as a moisture content detector that continuously detects the moisture content of grains during drying, uses a waveguide as its main part. A slot is provided in the waveguide, this surface is used as a detection surface, an oscillator is provided at one end of the waveguide, and a receiver is provided at the other end.

Then, a radio wave is leaked from the slot, and by combining this radio wave with the grain moving on the slot, the receiver receives the radio wave which is attenuated in proportion to the moisture content of the grain, thereby detecting the water content of the grain. . In such a detector, it is difficult to accurately detect the moisture content unless the grain moves in close contact with the detection surface. For this reason, the oscillator and receiver are attached to the surface of the waveguide opposite to the detection surface so as not to interfere with the normal movement of the grain on the detection surface.
When an oscillator and a receiver are installed in such a position, the direction of the radio waves from the oscillator is changed and guided to the waveguide, and the box wave guided by the waveguide is then redirected to the receiver. need to be guided. By changing the propagation direction of radio waves guided by a waveguide or from a waveguide hole provided in the waveguide wall, the radio waves can be guided into or out of the waveguide. A simple method for guiding the wave to the outside through a wave hole is to loosen a reflecting member with a reflecting surface that is angled with respect to the tube axis inside the waveguide, and then place this reflecting surface at the bottom of the waveguide. There is one that corresponds to the provided waveguide hole. When connecting the waveguide to another waveguide, oscillator, receiver, etc., the flange provided with the waveguide hole is aligned with the waveguide hole provided in the waveguide. The waveguide is fixed to the waveguide in this state, and connected through this flange. Since such a waveguide connecting device has a relatively simple configuration, it is often used in various types of detectors as described above. When connecting waveguides, if there are steps or gaps on the inner surface of the waveguide path, reflection or leakage of radio waves will occur, increasing loss.

Most of these steps and gaps occur at the joints of each component. Therefore, in the above-mentioned waveguide connection device, the joint between the reflective member and the waveguide, the joint between the flange and the waveguide, etc. require high processing precision, and It is necessary that the waveguide hole formed in the waveguide, the waveguide hole provided in the flange, and the terminal end of the reflective surface provided in the reflective member and one wall surface of the waveguide hole provided in the waveguide coincide precisely.
Although the occurrence of gaps can be prevented to some extent by improving the machining accuracy of the joint surfaces, the alignment of each surface is largely dependent on manual labor, and the alignment work during assembly requires a large number of man-hours. 1, 2, and 3 show conventional waveguide connection devices, in which 1 is a waveguide, 2 is a reflective member, and 3 is a waveguide connection device.
is a flange.

The end wall of the waveguide 1 is provided with a waveguide hole 4 that fits in with the inside of the waveguide 1, and the front surface of the reflection member 2 is provided with a reflection surface 5 having a predetermined angle with respect to the tube axis direction. A waveguide hole 6 having the same size as the waveguide hole 4 is provided in the center of the waveguide 3 . The reflective member 2 is mated to the end of the waveguide 1, the reflective surface 5 corresponds to the waveguide hole 4, and the terminal end 7 of the reflective surface 5 coincides with one surface 8 of the waveguide hole 4. Place it to stick. This fixation is performed using adhesive or the like. The flange 3 is fixed to the waveguide 1 by welding, adhesive, etc. with the waveguide hole 6 aligned with the waveguide hole 4. 9 is a mounting hole provided in the flange 3.

Although not shown, other waveguides, oscillators, or receivers are attached to the flange 3 either directly or via other flanges. With this configuration, the radio wave guided by the waveguide 1 is reflected by the reflecting surface 5 as shown by arrow A, changes direction, and propagates through the waveguide holes 4 and 6. If the radio waves are guided from the opposite direction, that is, the waveguide holes 4 and 6
When propagating from the side, the radio waves are reflected by the reflecting surface 5, change direction, and propagate into the waveguide 1. In the conventional device configured in this way, the reflecting member 2 and the flange 3 are configured to face each other through the wall of the waveguide 1, so there are many joints overall, and there are steps particularly in the above-mentioned portions. The factors that caused gaps were concentrated.

That is, a joint 10 between the reflective member 2 and the waveguide 1, and a joint 12 between the flange 3 and the waveguide 1. Therefore, when assembling a connection device with low loss, a considerable number of man-hours are required for the assembly work, resulting in an expensive device. Furthermore, as is well known, when connecting waveguides, a joint that is perpendicular to the propagation direction of fin waves significantly increases loss.

The present invention has been made in view of the above points, and its purpose is to reduce the overall number of joints without increasing the number of joints perpendicular to the radio wave propagation direction compared to conventional ones. The object of the present invention is to provide a waveguide connecting device that can reduce the number of components, is easy to assemble, and can be expected to improve efficiency.

In order to achieve the above object, the present invention is characterized by: a waveguide; A reflecting surface having a predetermined angle with respect to the tube direction of the waveguide is provided, and at least a portion provided with the reflecting surface is accommodated inside the waveguide so that this reflecting surface corresponds to a part of the notch. and a flange that is directly connected to the reflective member through the remainder of the cutout and is fixed to the waveguide, the waveguide having a waveguide hole that fits in with a part of the cutout. Located in the connected device.

An embodiment of the present invention shown in FIGS. 4, 5, and 6 will be described below.

According to the invention, as shown in FIG.
A notch 20 is provided at one plane end of '. This notch 20
is made to terminate at the end of the waveguide 1'. Further, the notch 20' is provided so that the end surface 21 of the plane end formed by cutting out one plane end of the waveguide 1' is perpendicular to the tube axis of the waveguide 1'. The reflecting member 2' extends downward by a thickness t of the wall of the waveguide 1', and extends the waveguide so that the reflecting surface 5 corresponds to the waveguide hole forming part 22 which is a part of the notch 20. 1'. The reflecting member 2' does not need to be entirely housed within the waveguide 1', but it is sufficient that at least the reflecting surface 5 is housed within the waveguide 1'. That is, except for the green corresponding to the notch 20 of the reflective surface 5, the other green may be brought into contact with the inner wall of the waveguide 1'. Thereby, the waveguide hole forming portion 22 of the notch 20 forms a waveguide hole. Then, with the waveguide hole 6 provided in the flange 3 and the waveguide hole forming part 22 aligned, the flange 3 and the reflecting member 2' are directly connected through the remaining part 23 of the notch 20, and the flange 3 is connected to the waveguide hole forming part 22. Fix it to tube 1'. When assembling,
By extending the lower part of the reflecting member 2', the plane 24 continuous with the end surface 7 of the reflecting surface 5 is made to precisely match one surface 25 of the waveguide hole 6 provided in the flange 3, and the reflecting member 2 is
' is welded to the flange 3 and fixed with adhesive or the like. Next, the reflective member 2' is housed at the end of the waveguide 1' from the end closure or through the notch 20, and the reflective member 2' is placed at the end of the waveguide 1', and Accurately align the other surface 26 of the corrugated hole 6 with the reflecting member 2' and the flange 3.
is fixed to the waveguide 1' by welding or adhesive. In this way, since the flange 3 and the reflecting member 2' can be directly connected, the number of joints can be reduced, the number of man-hours required for fitting work during assembly can be reduced, and as a result, an inexpensive waveguide connection device can be obtained. be able to.

Further, since the reflecting member 2' is housed inside the waveguide 1', there is no increase in the number of joints perpendicular to the direction of propagation of radio waves. Furthermore, since the number of joints can be reduced, the factors that cause steps and gaps in the waveguide path are reduced, and a reduction in loss can be expected. In the above embodiments, a case has been described in which the reflecting member 2' is extended by the thickness t of the wall of the waveguide 1'. The results are the same. Further, in the embodiment, a case has been described in which the flange 3 and the reflecting member 2' are separated, but since these two can be directly connected, they may be configured in one piece. This may be done by machining, but casting or the like may also be used. In this way, even better results can be obtained. That is, there is no need for any work to fit the flange 3 and the reflecting member 2' together, and the cause of the formation of steps and gaps in this part can be completely eliminated, which is more ideal. In addition, in the above embodiment, the notch 20 provided at the end of the waveguide 1' was described as closing at the end of the waveguide 1'. It may also be a hole as shown in FIG.

In this way, connection can be made at any position of the waveguide 1'. 9, 10 and 11 show other embodiments of the present invention, and these figures are shown with the waveguide 1' removed for ease of understanding.

This example will be explained below. A notch 20 is provided at one plane end of the waveguide 1'.
As shown in FIG. 2, the end portion of the end face 21 is cut out to be open on the side of the waveguide 1'. Note that this notch may be formed at the end of the waveguide 1' as shown in FIG. good. Although the flange 3' and the reflecting member 2' may be separated, they are integrally constructed. The flange 3' is provided with a waveguide hole 6 and a guide groove 30 for the waveguide 1' to facilitate positioning of the waveguide 1' with respect to the flange 3'. The side wall of the reflecting village 2' arranged in the guide groove 30 and the guide book 30
A side plate guide groove 31 for positioning the side wall of the waveguide 1' is formed between the reflecting member 2' and the side wall of the waveguide 1', and a groove 32 for cutting the guide groove 31 is formed at the rear of the reflecting member 2'. establish. This crinkle section 32 constitutes a positioning section for the waveguide 1'. The bottom wall 33 of the side plate guide groove 31 is made higher than the bottom wall 34 of the guide groove 30 by the thickness of the wall of the waveguide 1' from the portion where the waveguide hole 6 is located to form a rigid portion 35. Reflective member 2'
A step part 36 is provided above the rear part of the waveguide 1' to limit the movement of the waveguide 1' in the tube axis direction.
The waveguide 1' is inserted along the guide groove 3, and the waveguide 1' is inserted along the guide groove 3.
is accommodated in the end portion and inserted until the side-like portion of the end surface 21 comes into contact with the stepped portion 35. When the side edge of the end surface 21 touches the step 35, the end surface 21 is in good condition with one surface 26 of the waveguide hole 6, that is, the end surface 21 forms a continuous surface with the waveguide hole 6 and one surface 26. I will do it. At the same time, the end face 2 of the waveguide 1'
The end faces other than 1 abut on the edge, cut-off section 31 and step section 36. This positions the waveguide 1' and the integral part of the reflecting member 2' and flange 3'. and,
The integral parts of the waveguide 1', the reflecting member 2', and the flange 3' are fixed by suitable fixing means such as welding or adhesive.
In this way, it becomes easier to position the reflecting member 2' and the flange 3' with respect to the waveguide 1', and the number of assembly steps can be further reduced.

In this embodiment, in order to determine the position of the waveguide 1' in the tube axis direction, the shear cut portion 32 and the stepped portions 35, 3
6 is provided, but only one of them is required; in short, one surface 26 of the waveguide hole 6 and the end surface 21 of the waveguide 1'
It is sufficient if the positioning can be performed so that the two are in good agreement with each other.

In the case where the waveguide 1' and the integral part of the reflecting member 2' and flange 3' are positioned by the shear cut portion 32 or the step portion 36, the bottom wall 33 and the bottom wall 34 are made the same. In this case, the waveguide 1' has the structure shown in FIG. 7. In addition, the sheath section 32 and the stepped section 3
When positioning is performed using all of 5 and 36 or any two of them, use one of them as a reference, and use this waveguide 1 as a reference.
In terms of assembly and manufacturing, it is preferable for the waveguide 1' to face the end surface of another waveguide 1' with a small gap in between while the other waveguide 1' is in contact with the corresponding end surface of the waveguide 1'. Furthermore, in the embodiment described above, when the notch 20 is a hole, the side plate guide groove 31 penetrates to the other side of the flange 3, and the sheath section 32 and step section 36 are removed. Although all of the above explanations have been made regarding the case where the waveguide is rectangular, the present invention can also be applied to a circular waveguide.

As is clear from the above description, according to the present invention, a defective part is provided in the wall of a waveguide that communicates from the outside to the inside of the waveguide, and a part of this defective part is used as a waveguide. However, since the reflective member and flange are directly connected through the remaining part, the number of joints can be reduced, the number of man-hours required for fitting work during assembly can be reduced, and as a result, an inexpensive waveguide connection device can be obtained. be able to. Furthermore, since at least the reflecting surface of the reflecting section is housed inside the waveguide, there is no increase in the number of joints perpendicular to the direction of propagation of radio waves. Furthermore, since the number of joints can be reduced, the factors that cause steps and gaps in the waveguide path are reduced, and a reduction in loss can be expected.

[Brief explanation of drawings]

1, 2, and 3 are cutaway front views, right side views, and bottom views showing conventional examples; FIGS. 4, 5, and 6 are cutaway front views showing one embodiment of the present invention. , right side view, bottom view, FIG. 7 is a perspective view showing the end shape of the waveguide, FIG. 8 is a cut front view showing another embodiment of the present invention, FIGS. 9, 10, 11th
The figures are a cut front view, a left side view, and a plan view showing still another embodiment of the present invention, and FIG. 12 is a perspective view showing the end shape of the waveguide. 1'; waveguide, 2': reflective member, 3'; flange, 5:
Reflective surface, 20: notch, 21: part of the notch, 22: remainder of the notch. Multi-figure, 2 flea, 3 figure Tsutomu, 4 figure Tsutomu, 5 Hakoba, 5 figure 7 figure Tsutomu, Hako Tsutomu? Zubu/o Zutsutom'' Zuta/Otsuzu

Claims (1)

[Claims] 1. A waveguide, a notch provided in a wall of the waveguide so as to communicate between the outside and the inside of the waveguide, and a reflecting member having a reflecting surface having a predetermined angle and having at least a portion provided with the reflecting surface accommodated inside the waveguide such that the reflecting surface corresponds to a part of the notch; and a part of the notch. A waveguide connection device comprising: a waveguide hole communicating with the cutout portion; a flange directly connected to the reflection member through the remainder of the cutout portion; and a flange fixed to the waveguide. 2. The waveguide connection device according to claim 1, wherein the reflecting member and the flange are integrally constructed.