JP3216398B2 - Magnetron equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetron device used for a high-frequency heating device such as a microwave oven.

[0002]

2. Description of the Related Art As shown in FIGS. 12 to 14, a conventional magnetron device is designed to prevent burnout of choke coils 1a and 1b and reduce the size of filter case 5.
An insulating stem 4 having U-shaped cathode terminals 3a and 3b protruding from one end of the choke coils 1a and 1b and the attenuation electrodes 2a and 2b, and one end being swaged to a fixed joint A of the cathode terminals 3a and 3b. And the other end is connected to the terminal 6a of the capacitor 6 attached to the filter case 5.
One end of the choke coil 1a, 1b connected to the fixed terminal 6a is fixedly joined to the fixed joint A of the cathode terminals 3a, 3b by crimping, and the other end is extended in the direction of the capacitor 6. (See Japanese Patent Application Laid- Open No. Hei 5-217512 ) in which the existing attenuation electrodes 2a and 2b are provided.

[0003]

However, such a conventional magnetron device has a choke coil 1a,
1b and the damping electrodes 2a, 2b are fixedly joined by caulking at the fixed joint A, and when operation and non-operation are repeated, the cathode terminals 3a, 3b of the fixed joint A, the choke coils 1a, 1b, and the damper The electric resistance between the electrodes 2a and 2b increases, and the choke coils 1a and 1b, the cathode terminals 3a and 3b, and the attenuation electrodes 2a and 2b generate heat at a high temperature. As a result, the reliability that the damping electrodes 2a and 2b are particularly deformed in the fixed joint A due to the external impact, and short-circuits between the respective extended portions and the terminals 6a and 6b of the capacitor 6 to render the magnetron device inoperable. Problems, and the fixed joint A is connected to the choke coils 1a, 1b and the insulating stem 4.
And the attenuation electrode 2a, 2b,
There is a problem that the caulking operation is difficult, and the productivity is significantly reduced.

An object of the present invention is to provide a highly reliable magnetron device which improves productivity and does not cause a short circuit between the attenuation electrode and the capacitor.

[0005]

According to the magnetron device of the present invention, an insulating stem having a cathode terminal protruding therein, a capacitor attached to the filter case, and one end connected to the cathode terminal are provided in the filter case. includes a choke coil and the other end portion is connected to the capacitor, and a damping electrode having one end connected to the cathode terminal, prior to
A U-shaped first curl portion is formed at the end of the cathode terminal.
And the end of the attenuation electrode is outside the first curl portion.
A U-shaped second curl portion for covering and fixing the surface is formed.
And one of the choke coils is attached to the first curl portion.
An end is fixed, and the first curled portion and the second curled portion are further fixed.
Are fixed by welding, and an intermediate portion and the other end of the attenuation electrode extend in a direction opposite to the capacitor.

[0006]

With this configuration, the cathode terminal can be easily joined to the choke coil and the attenuation electrode, and a short circuit between the attenuation electrode and the capacitor can be prevented.

[0007]

Embodiments of the present invention will be described below with reference to the drawings.

As shown in FIGS. 1 to 3, a magnetron device according to a first embodiment of the present invention comprises an insulating stem 4 having U-shaped cathode terminals 3a and 3b made of iron or copper, a filter, and a filter. A capacitor 6 attached to the case 5 and also serving as a connection terminal for a power supply, one end of which is connected to the cathode terminals 3a and 3b, and the other end of which is connected to the terminals 6a and 6b of the capacitor 6 and a part of the filter circuit. And choke coils 1a and 1b made of iron or copper, and attenuation electrodes 7a and 7b each having one end connected to the cathode terminals 3a and 3b and made of at least one of iron, copper, and aluminum. The intermediate portion S and the other end T of the attenuation electrodes 7a and 7b extend in the opposite direction to the capacitor 6. Choke coils 1a, 1b and attenuation electrodes 7a, 7
b and the cathode terminals 3a and 3b are connected to the choke coil 1
One end of each of the a, 1b and the attenuation electrodes 7a, 7b is fixed by caulking at a U-shaped fixing joint A of the cathode terminals 3a, 3b, and then welded. In addition, the attenuation electrode 7
The overhang dimension L of each of the a and 7b is set to 15 mm or more to improve the absorption characteristics of the leakage noise and to increase the choke coils 1a and 1b.
1b is suppressed.

Next, the operation of the magnetron device will be described. In the magnetron device configured as described above, the intermediate portion S and the other end T of the attenuation electrodes 7a and 7b are
Since it extends in the opposite direction to the capacitor 6, even if it is deformed from the fixed joint A by an external impact, the attenuation electrode 7
There is no short circuit between the terminals 6a and 7b and the terminals 6a and 6b of the capacitor 6.

The damping electrodes 7a and 7b have high bending strength,
In addition, since it is made of at least one of iron, copper, and aluminum materials that are not easily softened at high temperatures such as arc welding, welding and joining can be easily performed, and the deformation amount is small.
As a result, leakage noise can be stably absorbed. Attenuation electrode 7
As the material of a and 7b, iron is particularly preferable.

Further, since the choke coils 1a, 1b and the damping electrodes 7a, 7b are joined by caulking and welding at the fixed joint A, the amount of deformation of the damping electrodes 7a, 7b is further reduced, and leakage noise is reduced. Stable absorption,
Further, even if the magnetron device repeatedly operates and deactivates, the cathode terminals 3a, 3b and the choke coils 1a, 1b
Also, the electric resistance between the damping electrodes 7a and 7b does not increase.

As described above, according to the embodiment of the present invention, a highly reliable magnetron device can be obtained.

The fixed joint A is a choke coil 1
Since they are not sandwiched between the a, 1b, the insulating stem 4, and the attenuation electrodes 7a, 7b, the work of caulking and welding is facilitated, and the productivity can be improved.

Next, second to fourth embodiments of the present invention will be described with reference to the drawings. FIG. 4 shows a second embodiment, in which one end of each of the choke coils 1a and 1b is bent at the fixed joint A to integrally form the attenuation electrodes 7a and 7b. According to this embodiment, the number of parts and the number of assembly operations are reduced, and the productivity is further improved.

FIGS. 5 and 6 show a third embodiment in which the attenuation electrodes 7a and 7b are bent in a direction approaching each other. According to this embodiment, it is possible to improve the absorption characteristics of the leakage noise with respect to the amount of deformation of the attenuation electrodes 7a and 7b due to an external impact or the like.

FIGS. 7 and 8 show a fourth embodiment, in which the other ends T of the attenuation electrodes 7a and 7b are bent toward the respective choke coils 1a and 1b to form an L-shape. According to this embodiment, the overhang dimension L can be further lengthened, so that the leakage noise absorption characteristics can be improved and the choke coils 1a, 1
The surface temperature of b can be suppressed.

Next, a fifth embodiment of the present invention will be described with reference to the drawings. The fifth embodiment differs from the above embodiments in that the cathode terminals 3a and 3a are different from each other as shown in FIGS.
b has a U-shaped first curl portion B for fixing one end of the choke coils 1a and 1b, and the attenuation electrode 7
a and 7b have a U-shaped second curl portion C which covers and fixes the outer surface of the first curl portion B. The choke coils 1a and 1b and the attenuation electrode 7
The connection between the cathode terminals 3a and 3b and the cathode terminals 3a and 3b is performed by caulking one end of the choke coils 1a and 1b to the first curl portion B, and then connecting the attenuation electrodes 7a and 7b to the first curl portion B.
b, the second curled portion C is covered and welded.
The thickness of the first curled portion B and the second curled portion C is preferably about 1/3 of the wire diameter of the choke coils 1a and 1b from the viewpoint of securing the strength after manufacturing and after welding. Has been confirmed by an impact test. In this embodiment, the plate thicknesses of the first curl portion B and the second curl portion C are 0.5 mm and 0.4 mm, respectively, with respect to the wire diameter of the choke coils 1a and 1b of 1.4 mm.

Next, the operation of the magnetron device according to the fifth embodiment will be described. In the magnetron device configured as described above, by providing the U-shaped first curl portion B and second curl portion C, the welding connection between the attenuation electrodes 7a and 7b and the cathode terminals 3a and 3b can be performed. It will be easier.

[0019]

As described above, according to the present invention, in a filter case, an insulating stem having a cathode terminal protruding therefrom, a capacitor attached to the filter case, and one end connected to the cathode terminal. A choke coil having an end connected to the capacitor, and an attenuation electrode having one end connected to the cathode terminal;
A U-shaped first curl portion is formed at the end of
The end of the attenuation electrode is fixed by covering the outer surface of the first curl portion.
U-shaped second curl portion is formed,
One end of the choke coil is fixed to the first curl portion.
And the first curl portion and the second curl portion
Are fixed by welding, and the middle part and the other end of the attenuation electrode extend in the opposite direction to the capacitor, so that the cathode terminal can be easily joined to the choke coil and the attenuation electrode, and the attenuation electrode And a short circuit between the capacitor and the capacitor can be prevented. As a result, it is possible to provide a magnetron device with improved productivity, high reliability, and secured strength after welding. is there.

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part of a magnetron device according to a first embodiment of the present invention.

FIG. 2 is a bottom view of the same.

FIG. 3 is a perspective view of a main part of an attenuation electrode section of the magnetron device.

FIG. 4 is a perspective view of a main part of a magnetron device according to a second embodiment of the present invention.

FIG. 5 is a bottom view of a main part of a magnetron device according to a third embodiment of the present invention.

FIG. 6 is a perspective view of the main part.

FIG. 7 is a bottom view of a main part of a magnetron device according to a fourth embodiment of the present invention.

FIG. 8 is a perspective view of the main part.

FIG. 9 is a bottom view of a main part of a magnetron device according to a fifth embodiment of the present invention.

FIG. 10 is an enlarged sectional view of a main part of the magnetron device.

FIG. 11 is a perspective view of a main part of the magnetron device.

FIG. 12 is a partial front view of a conventional magnetron device.

FIG. 13 is a partial bottom view of the magnetron device.

FIG. 14 is a perspective view of an attenuation electrode section of the magnetron device.

[Explanation of symbols]

 1a, 1b Choke coil 3a, 3b Cathode terminal 4 Insulating stem 5 Filter case 6 Capacitor 7a, 7b Attenuation electrode

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H01J 23/15

Claims (2)

(57) [Claims] In the filter case, an insulating stem having a cathode terminal protruding therefrom, a capacitor attached to the filter case, one end connected to the cathode terminal, and the other end connected to the capacitor. A choke coil and an attenuating electrode having one end connected to the cathode terminal; and a U-shaped first curl portion at an end of the cathode terminal.
The first curl formed and at the end of the attenuation electrode
A second U-shaped curl portion for covering and fixing the outer surface of the portion is formed.
The first curl portion is provided with the choke coil.
The first curl portion is fixed to one end of the
The magnetron device , wherein the second curl portion is fixed by welding, and an intermediate portion and the other end portion of the attenuation electrode extend in a direction opposite to the capacitor. 2. A damping electrode comprising at least one of iron, copper and aluminum.
The magnetron device as described.