Magnetic field generation apparatus for a magnetron tube, magnetron and method for replacing an old magnetron tube of a magnetron with a new magnetron tube

Abstract

A magnetic field generation apparatus is provided for a magnetron including a permanent magnet arrangement and a magnetic field conductor device. The magnetic field conductor device has a diverting element. The diverting element, which includes a plurality of rectangular diverting segments, is arranged detachably on the magnetic field generation apparatus during maintenance work in order to deflect a magnetic field generated by the permanent magnet arrangement away from further components of the magnetic field generation apparatus and components of the magnetron. A magnetron includes a magnetron tube and such a magnetic field generation apparatus. In a method for replacing an old magnetron tube of such a magnetron with a new magnetron tube, the diverting element is arranged on the magnetic field generation apparatus, and the old magnetron tube is removed from the magnetron and replaced with the new magnetron tube in order to then remove the diverting element again.

Claims

1. A magnetic field generation apparatus for a magnetron tube having a permanent magnet arrangement and a magnetic field conductor device, wherein the magnetic field conductor device comprises a diverting element, the diverting element being arranged detachably on the magnetic field generation apparatus during maintenance work, in order to deflect a magnetic field generated by the permanent magnetic arrangement such that the magnetron tube can be removed from the magnetron.

2. The magnetic field generation apparatus according to claim 1, wherein the permanent magnet arrangement comprises multiple circularly-arranged bar magnets oriented axis-parallel to one another and wherein the diverting element is configured cylindrically and arranged around the circularly-arranged bar magnets.

3. The magnetic field generation apparatus according to claim 2, wherein the bar magnets are made of samarium cobalt.

4. The magnetic field generation apparatus according to claim 1, wherein the diverting element comprises multiple, circularly-arranged diverting segments each configured in the form of a rectangular plate.

5. The magnetic field generation apparatus according to claim 1, wherein the diverting element comprises a high-permeability material.

6. A magnetron having a magnetron tube and having a magnetic field generation apparatus, wherein the magnetic field generation apparatus is configured according to claim 1.

7. The magnetron according to claim 6, wherein the permanent magnet arrangement is arranged coaxially to the magnetron tube.

8. The magnetron according to claim 6, wherein the magnetic field conductor device comprises a first yoke element, with the first yoke element comprising a fixing device for fixing the diverting element.

9. The magnetron according to claim 6, wherein the magnetic field conductor device comprises a second yoke element, with the magnetron tube being fixed to the second yoke element.

10. A method for replacing an old magnetron tube of a magnetron with a new magnetron tube, the magnetron comprising a magnetron tube and a magnetic field generation apparatus for the magnetron tube, the magnetic field generation apparatus comprising a permanent magnet arrangement and a magnetic field conductor device, wherein the magnetic field conductor device comprises a diverting element, the diverting element being arranged detachably on the magnetic field generation apparatus during maintenance work, in order to deflect a magnetic field generated by the permanent magnetic arrangement such that the magnetron tube can be removed from the magnetron, the method comprising arranging the diverting element on the magnetic field generation apparatus, releasing fixing means for fixing the old magnetron tube on fixing components of the magnetron, removing the old magnetron tube from the magnetron and the old magnetron tube with the new magnetron tube, fixing the new magnetron tube to the fixing components by the fixing means, and removing the diverting element.

11. The method according to claim 10, wherein rectangular diverting segments are arranged in the fixing device of the first yoke element for arranging the diverting element on the magnetic field generation apparatus.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) The figures show in:

(2) FIG. 1 a schematically illustrated sectional view of a magnetron with bar magnets arranged cylindrically around a magnetron tube,

(3) FIG. 2a a schematically-illustrated view of the magnetron illustrated in FIG. 1 with diverting segments of a diverting element arranged around the permanent magnet arrangement and with the housing removed;

(4) FIG. 2b a schematically-illustrated view of the magnetron illustrated in FIG. 2a without diverting element,

(5) FIG. 3 a schematically-illustrated sectional view of the magnetron illustrated in FIG. 2a,

(6) FIG. 4 a schematically-illustrated full sectional view of the magnetron illustrated in FIGS. 2a and 3.

DETAILED DESCRIPTION

(7) FIG. 1 schematically shows a sectional view of a magnetron 1 having a magnetic field generation apparatus 2 and a magnetron tube 3, which is only merely illustrated by outer contours.

(8) The magnetic field generation apparatus 2 comprises a permanent magnet arrangement 4 having multiple, circularly-arranged, cylindrically-shaped bar magnets 5 orientated axially parallel. The bar magnets 5 are arranged circularly around the magnetron tube 3.

(9) The magnetic field generation apparatus 2 further comprises a magnetic field conductor device 6 having a first yoke element 7 and a second, two-piece yoke element 8.

(10) The bar magnets 5 are arranged on the first yoke element 7. The first yoke element 7 further comprises a recess 9, in which the magnetron tube 3 is sectionally arranged. Furthermore, a fixing device 10 for receiving a diverting element (not shown) is formed at the first yoke element 7. The fixing device 10 is adapted to a cross-section of the diverting element.

(11) The second yoke element 8 is fixed to a fixing component 12 of the magnetron 1 by means of screws 11. The magnetron tube 3 is sectionally arranged in a recess 13 of the second yoke element 8 and bears against the second yoke element 8.

(12) The magnetic field conductor device 6 and the permanent magnet arrangement 4 of the magnetron 1 are arranged within a housing 14. The magnetron tube 3 protrudes into a rectangular hollow conductor 15, into which are coupled the electromagnetic waves generated by the magnetron tube 3.

(13) FIG. 2a shows a schematically-illustrated view of the magnetron 1 illustrated in FIG. 1, where the housing 14 has been removed from the magnetron 1. Furthermore, in this illustration, a diverting element 16 in the form of rectangular diverting segments 17 is arranged in the fixing device 10 of the first yoke element 7, in order to be able to remove the second yoke element 8 and the magnetron tube 3 from the magnetron 1. In this way, the magnetic field provided by the bar magnet 5 is deflected from the second yoke element 8 and the magnetron tube 3. In the illustration, individual diverting segments 17 are indicated with a reference numeral merely by way of example.

(14) The magnetron tube 3 can readily be replaced in that after arranging the diverting element 16 in the fixing device 10, the screws 11 are loosened and the second yoke element 8 is removed from the magnetic field conductor device 6. After that, the magnetron tube 3 can readily be pulled out of the recess 9 of the first yoke element 7 and be replaced with a new magnetron tube.

(15) FIG. 2b schematically illustrates removed the magnetron 1 illustrated in FIG. 2a with the housing 14 and without the diverting element 16. The fixing component 12 comprises a support portion 18, rested against by the second yoke element 8 and to which the second yoke element 8 is screwed. Furthermore, the fixing component 12 comprises support parts 19, which are fixed to the first yoke element 7 and to which the support portion 18 is screwed. In this illustration, individual bar magnets 5 are indicated with a reference numeral merely by way of example.

(16) FIG. 3 schematically shows a sectional view of the magnetron 1 illustrated in FIG. 2a and FIG. 4 shows a schematically-illustrated full sectional view of the magnetron 1 illustrated in FIG. 1. In FIG. 4, the magnetron is illustrated in a sectional view also below the second yoke element 8, so that only a part of the magnetic field generation apparatus 2 and of the magnetron tube 3 adjacent to the hollow conductor 15 is visibly illustrated.