JPS58100333A - Magnetron - Google Patents

Abstract

PURPOSE:To prevent a gasket from falling off and coming up by a method wherein a flangless end of a flanged metal cylinder is forced-fitted to be fixed to a cylinder-shaped part to hold the internal diameter side of a gasket between the other end of said metal cylinder, namely the flange of the end to an axial direction output terminal and a conductive member of the other part of an external surface. CONSTITUTION:A flangeless end 5b of a flanged metal cylinder 5 is fixed by forced fitting to a cylinder-shaped part of an output side metal sealing member 1e, while at the other end the flange 5a holds down the internal diameter side of a gasket 4 from the upper surface (the output terminal side) and holds the gasket 4 by compression together with a magnet 2a or the upper surface of a yoke 3a. Accordingly the gasket 4 is surely maintained also in the cource of transport, and the like without causing an falling-off accident. The metal cylinder 5 is forced-fitted to the output side metal sealing member 1e at the end part 5b thus obtaining stabilized connection in view of microwaves, moreover without using expensive silver solder for said junction part as before and doing with a few processes.

Description

[Detailed Description of the Invention] The present invention is designed to ensure that the gaskets used to prevent radio wave leakage work properly when attaching the magnetron to the waveguide.
Furthermore, the present invention relates to a magnetron in which the gasket can be easily attached to the magnetron.

FIG. 1 shows an example of a conventional magnetron, where l is the magnetron main body, 1a is an anode cylinder having a plurality of resonant cavities inside, and 1b is a metal sealing member on the cathode side.

lc is a cathode side insulator, ld is a cathode filament) 9-do, 1e is an output side metal stopper member, 1f is an output side insulator, 1
g is the output terminal, 2m, 2b is the permanent magnet, 3a*
3 b is an extra-tube magnetic path, 4 is a gasket made of a truly conductive and highly elastic material, 7 is a cylindrical metal member, and 8
is a perforated metal disk. FIG. 2 is an enlarged view of the vicinity of the gasket of the conventional magnet (a) shown in FIG. In FIG. 3, the cross section of the cylindrical metal member 7 is L-shaped and holds the gasket 4. FIG. 2 is a diagram showing a conventional example.

The magnetron usually has the output terminal ig down or sideways.
When a package is transported, a magnetron with a structure like the one shown in Figure 2.3 is prone to gasket failure accidents due to vibrations and shocks during transport and cargo handling.

Also! The waveguide receiver is connected to the waveguide 20 in the state shown in No. 411, and six waveguide receivers are installed in the waveguide.
01 is the gasket) 4K (5KL) 4K (Itomi Arashi contacts tightly and leakage radiation of 1 microwave does not occur) 5KL.

It is. However, in reality, the waveguide receiver has a gasket on the part 20m of the 4#IC (the state when it is inserted is 5 as shown in Figure 5).
In addition, the upper surface of the gasket 4 is often pulled and floated due to this wedge-in phenomenon, resulting in poor contact between the cylindrical metal member 7 and the inner diameter side 4m of the gasket 4. In this case, the output side metal sealing member 1@1 cylindrical metal member 7.
The microwave current flowing through the gasket 4° waveguide support @Boa heats and burns the area where the contact has deteriorated.

In the case of the example shown in FIG. 5, since the gasket 4 and the part near the outer diameter of the metal disk 8 are pressed against the waveguide receiver 20alc and are in close contact with each other, the gasket floats up and Even if the contact near the field gets bad, the el& will burn and discolor.
That's fine. However, in the case of the structure shown in Iris 3#A&C, when the inner diameter side of the gasket 4 floats, the microwave energy also propagates toward the permanent magnet 2m, which heats the magnet 2 and reduces the magnetic flux, or in extreme cases. It may crack. Note that conventionally, a cylindrical metal member 7 is attached to the output side metal sealing member 1.
It had an expensive structure in which it was fixed to the stripe 5 with a silver foil 59 as shown in Figure 2.

In order to avoid the above-mentioned problems, conventionally, the inner diameter of the gasket 4 is set smaller than the outer diameter of the cylindrical metal member 7, and larger than the diameter of the 3 m-sized hole in the outer diameter of the gasket 4. Measures were taken to prevent gaskets from falling off and burning. However, in this case, force is added to the gasket, which reduces its elasticity and makes it hard, so if the flatness of the 20m part of the waveguide receiver is poor, microwave energy may leak in the part where there is little bite. I had problems such as the gasket in that area burning due to poor contact. Also, since the gasket has to be pushed into a narrower space, the number of man-hours increases.
If the hole a is eccentric, it will take a lot of man-hours to insert the gasket 4, and there will be a problem that the waveguide support m20m and the gasket 4 will not come into contact with the metal chips.

The object of the present invention is to connect a magnetron to a waveguide.
c. To provide a magnetron that does not cause the various problems described above.

In order to achieve the above object, in this invention, the cylindrical part k of the output side metal sealing member and the end part without a flange of the metal cylinder with a flange are forcibly fitted and fixed, and the other end of the cylinder, i.e. The inner diameter side of the gasket was sandwiched between the brim at the end near the axial ceramic output terminal and the conductive member on the outside** to prevent the gasket from falling off or rising.

6 to 9 are enlarged views of main parts of four different embodiments of the present invention, and in each example, the flange metal cylinder 6 connects the non-flange end 5b to the output side metal sealing member 1. It is fixed to the cylindrical part by forced fitting, and at the other end, a flap 51 presses the inner diameter side of the gasket 4 from the upper surface (output terminal side), and compresses the gasket 4 with the upper surface of the magnet 2 or N-3. It's being held in place. Therefore, gasket 4 is reliable even during transportation! It is held securely and no accidents occur. metal cylinder 5
is forcibly fitted with the output side metal sealing member 1e at the end portion 5b,
A stable connection is obtained from a microwave point of view, and this connection does not require the use of expensive silver solder as in the past, requiring only a small number of man-hours. The outer diameter of gasket 4 is 3 m.
The inner diameter of the gasket 4 may be the same as or slightly smaller than the hole diameter of the flange metal cylinder 5.
The gasket needs to be the same as or larger than the outer diameter of the gasket (see figure), but smaller than the outer diameter of the 5m tail, making gasket insertion very easy, reducing man-hours, and reducing the weight of the gasket itself. Furthermore, -v Gnetron body 1
5 of the metal cylinder 6 even if the hole of the yoke 3m is eccentric.
By setting the inner diameter of the gasket 4 larger than the outer diameter of the C section, the elasticity of the gasket 4 is uniform in all parts, and since the waveguide receiver is concentric with the hole in the part 20 and the hole 3, , an ideal connection is possible. Furthermore, if a short slit is provided at the end 5b of the metal cylinder 5 at St that does not impede the microwave connection, fitting becomes easier. If the metal cylinder 5 is made of a magnetic material, such as a galvanized iron plate, the permanent magnet 2aK will be attracted to the 11, so the forced fitting part at the end 5b should be formed with a degree of fitting that allows for good contact in terms of Micro technology. If there is, there is little risk that the metal cylinder 5 will come out.

In the embodiment shown in FIG.
It is designed so that it can be held between 31 and 31. In this example, if the internal clearance of the gasket 4 is set small, the gasket 4 and the metal cylinder 5 can be assembled separately and supplied as an assembled part, further reducing the number of man-hours. The same can be done with the embodiment shown in Figure 6.

The oscillation of a magnetron has relatively many harmonic components, but the dimension h in Fig. 8.9, that is, the axial length of the space surrounded by the metal sealing member l and the metal cylinder 5, can be used to eliminate unnecessary radiation. #tbal/4 of the wavelength (electrical length) of the specific harmonic that you want to suppress
A suppressive effect can be obtained by adding K. In the embodiment shown in FIG. 9, the end portion 5b to be forcibly fitted has a folded trap structure, which facilitates insertion and reduces the number of man-hours.

As explained above, according to the present invention, gasket falling off, gasket burning, magnet cracking, etc. do not occur, and the number of man-hours is also reduced.

[Brief explanation of the drawing]

Figure 1 is a diagram showing an example of a conventional magnetron, Figure 2 is an enlarged view of the vicinity of its gasket, Figure 3 is a diagram of a conventional example of a different gasket holding structure, and Figure 4 is a state of connection between the magnetron and waveguide. Figure 5 is an explanatory diagram of the gasket floating when connected to a conventional magnetron waveguide, Figures 6 to 9
The figures are enlarged views of main parts of different embodiments of the present invention. 1...Output side metal sealing member, 1f...Output side insulator, 2m...Permanent magnet, 3m...Yoke, 4...
Gasket, 5...Metal cylinder with flange, 5m...Brim, 5b...Forcibly fitted end.

Claims (1)

[Claims] 1. A jIL electrically conductive and highly elastic gasket is interposed between the outer surface conductive member insulated with respect to the output terminal located in the waveguide and the liquid guide tube wall, and the In a magnetron that is attached to a wave tube, the cylindrical part of the metal sealing member that is sealed to the 1IIi cylinder end and supports the output terminal through an insulator is attached to the flangeless end of the flange-equipped metal cylinder. A magnetron nitrogen gasket, characterized in that the gasket is forcibly fitted and fixed, and the gasket is held between the collar at the end of the cylinder near the axial output terminal and another conductive member on the outer surface. i. Claim 8, in which the axial distance between the metal blocking member, the metal cylinder, and the rare space is equivalent to 1/4 of the fear of specific radio waves whose unnecessary radiation should be suppressed. The magnetron described in item 1.