Magnetron

Patent metadata

Field	Value
Publication number	US-12548729-B2
Application number	US-202418777641-A
Country	US
Kind code	B2
Filing date	Jul 19, 2024
Priority date	Jul 28, 2023
Publication date	Feb 10, 2026
Grant date	Feb 10, 2026

Abstract

Provided is a magnetron capable of preventing damage to a coil and suppressing oscillation stop due to occurrence of abnormal oscillation. A magnetron is a high-output type industrial magnetron in which all plate-shaped vanes belonging to a first plate-shaped vane group and all plate-shaped vanes belonging to a second plate-shaped vane group have the same number (at least three or more) of through holes near tips in a direction of a central axis, and when n is a numerical value indicating an odd number starting with 1, an n-th pressure equalizing ring penetrates to come into contact with an n-th through hole of all the plate-shaped vanes belonging to the first plate-shaped vane group and an (n+1)-th pressure equalizing ring penetrates to come into contact with an (n+1)-th through hole of all the plate-shaped vanes belonging to the second plate-shaped vane group.

First claim

The invention claimed is:

1 . A high-output type industrial magnetron comprising:
an anode cylindrical body; a plurality of plate-shaped vanes each of which has one end fixed to each of a plurality of different fixing portions on an inner wall surface of the anode cylindrical body and another end extending from the fixing portion toward a central axis of the magnetron; and a predetermined number of pressure equalizing rings arranged inside the anode cylindrical body, wherein the plurality of plate-shaped vanes constitute a first plate-shaped vane group constituted by a set of the plate-shaped vanes arranged in every other line clockwise or counterclockwise with a plate-shaped vane at a predetermined position as a start position and a second plate-shaped vane group constituted by a set of the plate-shaped vanes excluding the first plate-shaped vane group, all the plate-shaped vanes belonging to the first plate-shaped vane group and all the plate-shaped vanes belonging to the second plate-shaped vane group have a same number (at least three or more) of through holes near tips in a direction of the central axis, the number being a number set, by performing a test operation in a production stage of the magnetron, to widen dissociation between a fundamental wave generated by resonance in a resonance cavity and unnecessary radiation, when n is a numerical value indicating an odd number starting with 1, the n-th pressure equalizing ring penetrates to come into contact with the n-th through holes of all the plate-shaped vanes belonging to the first plate-shaped vane group, and the (n+1)-th pressure equalizing ring penetrates to come into contact with the (n+1)-th through holes of all the plate-shaped vanes belonging to the second plate-shaped vane group.

2 . The magnetron according to claim 1 , wherein
the n-th through holes of all the plate-shaped vanes belonging to the first plate-shaped vane group have a congruent shape, the (n+1)-th through holes of all the plate-shaped vanes belonging to the second plate-shaped vane group have a congruent shape, and the n-th through holes and the (n+1)-th through holes have different areas.

3 . The magnetron according to claim 1 , wherein
the n-th pressure equalizing ring does not contact the n-th through holes of all the plate-shaped vanes belonging to the second plate-shaped vane group, and the (n+1)-th pressure equalizing ring does not contact the (n+1)-th through holes of all the plate-shaped vanes belonging to the first plate-shaped vane group.

4 . The magnetron according to claim 1 , wherein
the n-th pressure equalizing rings are connected to each other at a predetermined position of the pressure equalizing rings, and the (n+1)-th pressure equalizing rings are connected to each other at a predetermined position of the pressure equalizing rings.

Assignees

• Hitachi Power Solutions Co Ltd

Inventors

• Torai Reiji

Classifications

• H01J25/50 Primary

  Magnetrons, i.e. tubes with a magnet system producing an H-field crossing the E-field (with travelling wave not moving completely around the electron space H01J25/42; functioning with plural reflection or with reversed cyclotron action H01J25/62, H01J25/64) · CPC title

• H01J23/20

  Cavity resonators; Adjustment or tuning thereof · CPC title

• H01J25/587

  Multi-cavity magnetrons · CPC title

• H01J23/02 Primary

  Electrodes; Magnetic control means; Screens (associated with resonator or delay system H01J23/16) · CPC title

• H01J23/14

  Leading-in arrangements; Seals therefor · CPC title