JP2000164149A - Magnetron - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a magnetron capable of preventing the bonding failure between an antenna lead and a vane, improving quality, and reducing the working time and the cost. SOLUTION: In this magnetron, any one of an antenna lead 18 and a vane 12 is formed with a projecting part, and the other is formed with an insertion part, in which the projecting part is to be inserted. Practically, a bonding part of the vane 12 is formed with a projecting part 12c, and a bonding part of the antenna lead 18 is formed with a hole 18b as an insertion part, in which the projecting part 12c formed in the vane 12 is to be inserted.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetron used for microwave heating equipment such as a microwave oven, a radar, and the like, and more particularly to an improvement in a joint between an antenna lead and a vane.

[0002]

2. Description of the Related Art FIG. 8 is an overall configuration diagram of a general magnetron used for a microwave oven or the like.

In this magnetron, a magnetron body 10 which is a two-pole vacuum tube covered with a yoke 4 and a radiating fin 5 is formed on a case 3 in which a capacitor 1, a choke coil 2 and the like are built.

The anode cylinder 11 which forms a part of the vacuum wall of the main body 10 is made of oxygen-free copper or the like, and an even number of vanes 12 are radially provided on the inner periphery thereof.
2 is a small and large diameter strap ring 1 every other piece
Connections 3 and 14 stabilize the π mode oscillation.

A magnetic field of an annular permanent magnet 15 arranged above and below the anode cylinder 11 is applied to both ends of the anode cylinder 11.
And a pole piece 17 for concentrating in a working space between the tip of the anode and the cathode 16 provided at the center of the anode cylinder 11.

The cathode 16 is made of a filament in which, for example, a trim tungsten wire or the like is wound in a coil shape.
It is provided in the space surrounded by the tip of each vane 12 so as to be located at the center of the anode cylinder 11.

One end of the output antenna lead 18 is joined to one of the vanes 12, and the pole piece 1 is connected to the other end.
7 through a central portion of an insulating tube 20 composed of a through-hole 17a, an output-side metal tube 19, a ceramic tube and the like, and is fixed by a sealing portion 21 of an exhaust pipe. The sealing portion 21 is covered with an antenna cap 22.

The output side metal cylinder 19 is directly and electrically connected to the anode cylinder 11, and is connected to the anode cylinder 11 and the vane 12.
The microwave power oscillated by the cavity resonance circuit formed as described above travels on the output antenna lead 18 extending on the central axis of the output metal tube 19 as a coaxial line, and is radiated from the output antenna 23 at the tip.

The output antenna lead 18 is connected to a microwave (2450 M) generated in the main body 10 of the magnetron.
Hz) to be emitted to the outside and brazed to one of the vanes 12 provided on the inner periphery of the anode cylinder 11.

[0010] The method is performed in a hydrogen furnace at about 800 ° C to 90 ° C by silver plating of a brazing silver part or a joining part.
Brazed at 0 ° C.

In the prior art, generally, as shown in FIG.
a and a concave portion 12a formed at the upper end of the vane 12 are combined in a cross shape, and positioned so that the antenna lead 18 does not shift with respect to the vane 12, and brazed.

[0012]

However, in the above-mentioned prior art, since the concave portions 12a and the concave portions 18a are simply combined, vibrations and shocks in the assembly process (particularly vertical vibrations) are caused. If a large jig is not used, the antenna lead 18 will come off from the concave portion 12a of the vane 12 and cannot be brazed and joined at an accurate position, causing a defect and deteriorating the quality of the magnetron. I do.

When an obvious defect occurs, the defect is corrected if it can be corrected. However, it takes time, parts, cost, and the like required for the correction. A large loss occurs.

Incidentally, Japanese Patent Application Laid-Open No. Hei 6-36684 discloses that
A technique is disclosed in which the same recess as that described above is formed in the vane and the antenna lead, and bonding is performed by laser welding.

Therefore, the present invention has been made to solve such a problem, and it is possible to prevent a bonding failure between an antenna lead and a vane, to improve quality, and to reduce a work time and a time. It is an object of the present invention to provide a magnetron capable of reducing costs.

[0016]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention is directed to a method in which a cathode arranged at the center of an anode cylinder is radially arranged and joined to the inner periphery of the anode cylinder. In a magnetron formed by joining an antenna lead that radiates microwaves to the outside of the vane at one end, a protrusion is formed at one of the joints between the antenna lead and the vane, and the protrusion is formed at the other end. An insertion portion to be inserted is formed.

Further, a projection is formed at the joint of the vane, and a hole is formed at the junction of the antenna lead as an insertion portion into which the projection formed on the vane is inserted. .

[0018] Further, a protrusion is formed at the joint of the vane, and a cutout is formed at the joint of the antenna lead as an insertion portion into which the protrusion formed on the vane is inserted. is there.

Further, a projection is formed at a joint of the antenna lead, and a hole is formed at a junction of the vane as an insertion portion into which the projection formed on the antenna lead is inserted. is there.

Further, the insertion portion is formed in a tapered shape into which the projection is press-fitted.

Further, the convex portion is formed in a tapered shape to be press-fitted into the insertion portion.

Further, the present invention is characterized in that, after the convex portion is inserted into the insertion portion, the penetrating portion is bent and then joined.

Further, the present invention is characterized in that a brazing material part is annularly mounted on the convex part, inserted into the insertion part and joined.

[0024]

Embodiments of the present invention will be described below in detail with reference to the drawings. The entire configuration of the magnetron is the same as that shown in FIG.

FIG. 1 is a block diagram of a main part of a first embodiment of the present invention. The same reference numerals as those in FIG. 9 denote the same or corresponding parts.

In this embodiment, a substantially L-shaped notch 12b is formed at the joint of the vane 12, thereby forming a convex portion 12c projecting in the lateral direction and an opening portion 12d opening upward. Have been.

On the antenna lead 18 side, a hole 18b is formed slightly above a conventional concave portion 18a formed at the lower end portion as an insertion portion into which the convex portion 12c formed on the vane 12 is inserted. I have.

The vane 12 and the antenna lead 18 thus formed are connected to the vane 1 as shown in FIG.
2 by inserting the lower end of the antenna lead 18 from the upper opening 12d of the substantially L-shaped notch 12b and moving the antenna lead 18 to the right in the drawing, as shown in FIG. Then, the projection 12c on the side of the vane 12 is inserted, and brazing is performed in this state.

As described above, by inserting the convex portion 12c formed on the vane 12 into the hole 18b formed on the antenna lead 18, variations in component dimensions, vibrations and shocks in the assembling process as in the related art are obtained. (Especially, vertical vibration or impact) prevents the antenna lead 18 from coming off in the vertical direction.

Therefore, the brazing can be performed at an accurate position without using a large-scale jig, and no defect occurs, so that the quality of the magnetron is improved. Further, it is possible to reduce the working time and cost for processing the bonding failure.

FIG. 2 is a block diagram of a main part of a second embodiment of the present invention. The same reference numerals as those in FIG. 1 denote the same or corresponding parts.

In this embodiment, the upper and lower surfaces 1 of the hole 18b formed in the antenna lead 18 in the above embodiment are shown.
8c and 18c are tapered shapes into which the convex portions 12c of the vanes 12 are press-fitted.

With this configuration, the insertion of the convex portion 12c of the vane 12 into the hole 18b of the antenna lead 18 has a press-fit structure as shown in FIG. 2B.
Without using a jig, attach the antenna lead 18 to the vane 1
2 can be fixed.

Therefore, brazing can be performed at a more accurate position than in the first embodiment, and no defect occurs, so that the quality of the magnetron is further improved. Further, it is possible to further reduce the working time and cost for treating the joint failure.

FIG. 3 is a block diagram of a main part of a third embodiment of the present invention. The same reference numerals as those in FIGS. 1 and 2 denote the same or corresponding parts.

In the present embodiment, contrary to the second embodiment, the convex portion 12c side (the upper surface 12g here) of the vane 12 has a tapered shape. The same operation and effect as in the second embodiment can be obtained.

FIG. 4 is a block diagram of a main part of a fourth embodiment of the present invention. The same reference numerals as those in FIGS. 1 to 3 denote the same or corresponding parts.

In the present embodiment, the protruding portion 12c formed on the vane 12 in the first embodiment is formed longer, and is inserted into the hole 18b of the antenna lead 18 as shown in FIG. Later, the penetrating portion 12e is bent downward by a press or the like. In addition, Bain 1
The projecting direction of the second convex portion 12c is opposite to that of the first embodiment (FIG. 1), but this is because the penetrating portion 12e appears on the side opposite to the bending direction of the antenna lead 18, making it easy to press. To do that.

After the projection 12c of the vane 12 is inserted into the hole 18b of the antenna lead 18, the penetration 12e
The antenna lead 1 is bent by bending the
8 can be completely fixed to the vane 12.

Therefore, the brazing bonding can be performed at an accurate position more than that of the second and third embodiments, and no defect occurs, so that the quality of the magnetron is further improved. Further, it is possible to further reduce the working time and cost for treating the joint failure.

FIG. 5 is a block diagram of a main part of a fifth embodiment of the present invention. The same reference numerals as those in FIGS. 1 to 4 denote the same or corresponding parts.

In the present embodiment, when the projection 12c of the vane 12 is inserted into the hole 18b of the antenna lead 18, a rectangular ring-shaped silver solder as shown in FIG. After the material component 30 is mounted, it is inserted into the hole 18b of the antenna lead 18 as shown in FIG.

This eliminates the need for a silver plating process on the joined components, and can reduce costs in this regard.

FIG. 6 is a block diagram of a main part of a sixth embodiment of the present invention. The same reference numerals as those in FIGS. 1 to 5 denote the same or corresponding parts.

In each of the above embodiments, the antenna lead 1
Although the hole 18b into which the convex part 12c of the vane 12 is inserted is formed in 8, the notch 18d cut out in the horizontal direction is formed in this embodiment.

Even if formed in this manner, the insertion relationship can be maintained and the vertical displacement of the antenna lead 18 can be prevented, so that a certain result can be obtained in terms of the above-described effects.

FIG. 7 is a block diagram of a main part of a seventh embodiment of the present invention. The same reference numerals as those in FIGS. 1 to 6 denote the same or corresponding parts.

In each of the above embodiments, the projection 12c is formed on the vane 12 side. In this embodiment, a hole 12f is formed on the vane 12 side, and the projection 18e is formed on the antenna lead 18 side.
Is formed.

Even if formed in this way, the same operation and effect as in the first embodiment can be obtained, that is, brazing can be performed at an accurate position without using a large-scale jig, and defects can be prevented. The quality of the magnetron is improved. Further, it is possible to reduce the working time and cost for processing the bonding failure.

In the first to sixth embodiments described above, the recess 18a is formed at the lower end of the antenna lead 18 as in the prior art. However, without this, the intended purpose of the present application is achieved. it can.

The first to fourth, sixth, and seventh embodiments can be applied not only to brazing but also to joining by laser welding, and similar effects can be expected.

[0052]

As described above, according to the present invention, a protrusion is formed on one of the joints between the antenna lead and the vane, and an insertion portion for inserting the protrusion is formed on the other. Since the joint portion between the antenna lead and the vane has an insertion relationship, the displacement of the antenna lead with respect to the vane can be suppressed. Therefore, it is possible to prevent the bonding failure between the antenna lead and the vane, to improve the quality, and to reduce the working time and the cost.

Also, a large jig is used by forming a convex portion at the joint of the vane and forming a hole at the joint of the antenna lead as an insertion portion into which the convex portion formed on the vane is inserted. In this case, the magnetron can be bonded at an accurate position and no defect occurs, so that the quality of the magnetron is improved. Further, it is possible to reduce the working time and cost for processing the bonding failure.

The insertion relationship can also be maintained by forming a convex portion at the joint of the vane and forming a notch at the joint of the antenna lead as an insertion portion into which the convex portion formed on the vane is inserted. Since the displacement of the antenna lead can be prevented, a certain result can be obtained in terms of the above-described effects.

As described above, it is also possible to form a large protrusion at the joint of the antenna lead and to form a hole at the joint of the vane as an insertion portion into which the protrusion formed on the antenna lead is inserted. The joining can be performed at an accurate position without using a jig, and no defect occurs, so that the quality of the magnetron is improved. Further, it is possible to reduce the working time and cost for processing the bonding failure.

Further, since the insertion portion is formed in a tapered shape into which the convex portion is press-fitted, the antenna lead can be fixed to the vane without using a jig. Since the bonding can be performed at the position and no defect occurs, the quality of the magnetron is further improved. Further, it is possible to further reduce the working time and cost for treating the joint failure.

The same effect as described above can be obtained by forming the convex portion in a tapered shape that is press-fitted into the insertion portion.

Further, after the projection is inserted into the insertion portion, the penetrating portion is bent and then joined, whereby the antenna lead can be completely fixed to the vane, which is equal to or more than the tapered shape. In addition, since the bonding can be performed at an accurate position and no defect occurs, the quality of the magnetron is further improved. Further, it is possible to further reduce the working time and cost for treating the joint failure.

Further, by mounting a brazing material part on the convex part, inserting the brazing material part into the insertion part and joining, for example, if a silver brazing material part is used, the silver plating treatment on the joining part becomes unnecessary. Cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a main part of a first embodiment of the present invention.

FIG. 2 is a configuration diagram of a main part of the second embodiment.

FIG. 3 is a configuration diagram of a main part of the third embodiment.

FIG. 4 is a main part configuration diagram of a fourth embodiment.

FIG. 5 is a configuration diagram of a main part of the fifth embodiment.

FIG. 6 is a configuration diagram of a main part of the sixth embodiment.

FIG. 7 is a configuration diagram of a main part of the seventh embodiment.

FIG. 8 is an overall configuration diagram of a general magnetron used for a microwave oven or the like.

FIG. 9 is a configuration diagram of a main part of a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Magnetron main body 11 Anode cylinder 12 Bain 12c Convex part 12g Upper surface (tapered shape) 12e Penetration part 12f Hole 13, 14 Strap ring 15 Permanent magnet 16 Cathode 17 Pole piece 18 Antenna lead 18a Depression 18b hole 18c Upper and lower surfaces (tapered shape) 18d Notch 18e Convex part 30 Silver brazing material part

Claims (8)

[Claims] 1. A lead of an antenna for radiating microwaves to the outside is joined to an end of a vane radially arranged with respect to a cathode arranged at the center of the anode cylinder and joined to an inner periphery of the anode cylinder. The magnetron according to claim 1, wherein one of the joints between the antenna lead and the vane has a convex portion, and the other has an insertion portion into which the convex portion is inserted. 2. A joint portion of the vane is formed with a convex portion, and a hole is formed in a joint portion of the antenna lead as an insertion portion into which the convex portion formed in the vane is inserted. The magnetron described. 3. A joint portion of the vane is formed with a convex portion, and a joint portion of the antenna lead is formed with a cutout as an insertion portion into which the convex portion formed on the vane is inserted. 2. The magnetron according to 1. 4. A joint portion of the antenna lead, wherein a convex portion is formed, and a hole is formed in the joint portion of the vane as an insertion portion into which the convex portion formed in the antenna lead is inserted. 2. The magnetron according to 1. 5. The magnetron according to claim 1, wherein said insertion portion is formed in a tapered shape into which said convex portion is press-fitted. 6. The magnetron according to claim 1, wherein said convex portion is formed in a tapered shape to be pressed into said insertion portion. 7. The method according to claim 1, wherein after inserting the convex portion into the insertion portion, the penetrating portion is bent and then joined.
7. The magnetron according to claim 6. 8. The magnetron according to claim 1, wherein a brazing material part is annularly mounted on the convex part, inserted into the insertion part and joined.