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Magnetron

A magnetron and anode technology, applied in the field of magnetron, can solve the problem of damage to high-voltage parts and achieve the effect of preventing discharge

Inactive Publication Date: 2003-03-19
SANYO ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Therefore, in a microwave oven using a magnetic flux leakage transformer, if the power is turned on without preheating the filament, a 8-10kV no-load voltage is applied to the magnetron at the initial stage when electrons are not released, and the cylindrical metal container If the insulation resistance of the joint surface and the cathode lead wire is reduced, discharge occurs between the joint surface of the cylindrical metal container and the cathode lead wire through the bottom surface of the insulator sleeve, causing an overvoltage wave and causing damage to high-voltage parts.

Method used

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Experimental program
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Embodiment 1

[0022] Embodiment 1 of the present invention will be described in detail with reference to the drawings.

[0023] figure 1 It is a longitudinal sectional view showing the main part of the magnetron according to Embodiment 1 of the present invention, figure 2 is a longitudinal section of the same principal part, image 3 is a cross-sectional view of the same principal part, Figure 4 is the upper surface diagram of the same insulator sleeve, Figure 5 It is a figure which shows the other Example of an insulator sleeve.

[0024] 1 is the main part of the magnetron of the vacuum diode covered by the frame 2 and the heat sink 3 .

[0025] 4 is a casing for internally installing a capacitor 5 and a choke coil 6 for suppressing noise, and the opening of the casing 4 is attached to the cover 7 so that the noise does not leak to the outside.

[0026] 8 is the anode of the magnetron, and the anode 8 is formed of oxygen-free copper, and the anode cylinder 9 forming a part of the v...

Embodiment 2

[0040] Next, Embodiment 2 of the present invention will be described with reference to the drawings. The same reference numerals are assigned to the same configurations as in the first embodiment described above, and description thereof will be omitted.

[0041] Figure 6 It is a vertical sectional view of the main part of Embodiment 2 of the present invention.

[0042] Reference numeral 27 is a cylindrical metal container in which one end 27a is joined to the anode 8 and the other end 27b is brazed to the joint surface 25 formed around the insulator sleeve 21 and hermetically joined.

[0043] 27c is a bent portion formed in the cylindrical metal container 27 from the other end opening 27b toward the bottom surface 26a of the concave portion 26, and the bent portion 27c covers the entire bottom surface 26a of the concave portion 26. With such a structure, even if metals such as thorium and tungsten are evaporated from the surface of the filament 14, since the bent portion 27...

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Abstract

A cathode 13 with a filament 14 arranged at a center axis part of an anode 18 is supported by a pair of cathode leads 17, a pair of magnetic pole pieces 19 with a through-hole 19a formed at around the center are arranged at both ends of the anode 8, an opening 24b at one end of a cylindrical metal container 24 is joined airtightly with a junction face formed at a stem insulating body 21, a circular brim part 24c set in extension at the side of the cathode leads 17 is formed at the opening 24b, and a bottom face 26a of the stem insulating body 21 is to be covered with the brim part 24c. To surely prevent discharge generated between a junction part of a stem insulating body with a cylindrical metal container and cathode leads.

Description

technical field [0001] The present invention relates to a magnetron for generating microwaves installed in a microwave oven. Background technique [0002] The cathode part of the conventional microwave oven magnetron is, for example, described in Japanese Patent Publication No. 7-62979 (H01J 23 / 14, H01J 9 / 24, H01J 23 / 12), and the two ends of the filament made of thoriated tungsten They are respectively fixed to a pair of end boxes in which a cathode lead made of molybdenum (Mo) or the like is fixed. These cathode lead wires extend to the outside through the through hole of the insulator sleeve, and a cylindrical metal container with one end of the anode fixed is brazed with brazing material on the metal sprayed surface of the periphery of the insulator sleeve. The two ends of the anode are arranged with a pair of magnetic pole pieces with a through hole in the central part, which guides the magnetic force of the magnet not shown in the figure to the vicinity of the filament...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01J23/14H01J23/04H01J23/15H01J25/50
CPCH01J9/323H01J23/15H01J29/865
Inventor 村尾则行长谷川节雄中井聪冈田则幸三木一树
Owner SANYO ELECTRIC CO LTD
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