CN1567519A - A-packaging brazing structure for magnetron - Google Patents

Abstract

The invention discloses an A-casing brazed structure of magnetic controlled tube, including an A-casing and an A-ceramic component; there is an annular double-humped ridge raised upward, formed on the top surface of the A-casing, the ridge closely contacts with the bottom surface of the A-ceramic component and is welded together with each other in a brazing mode. The section of the ridge is 'M'-shaped. The convex parts of the ridge are placed with solder copper wires. The beneficial effects: it forms double annular welding between the top surface of the A-casing and the bottom surface of the A-ceramic component, largely enhancing the weld strength and avoiding the cracking of the welded parts due to the external impact, and packing the sealing state of the magnetic controlled tube.

Description

The A-envelope brazed structure of magnetron

Technical field

The present invention relates to a kind of magnetron, particularly relate to a kind of magnetron A-envelope brazed structure.

Background technology

In general, magnetron be a kind of be used for microwave oven or electric lighting convert electric energy to microwave electromagnetic can electronic device.

As depicted in figs. 1 and 2, the structure of magnetron is generally: by last yoke 1a and lower yoke 1b in conjunction with and the yoke 1 of shape " mouth " font, be provided with the anodal cylinder made from copper pipe 2 in the space that yoke 1 surrounds, in anodal cylinder 2, be provided with several dividing plates 3 vertically at regular intervals, form high-frequency resonant cavity between the dividing plate 3 respectively, the upper and lower sides of the inner of described dividing plate 3 is respectively equipped with the pressure ring groove, alternately be provided with inboard grading ring 4 and outside grading ring 5 in the pressure ring groove, described anodal cylinder 2 and dividing plate 3 form the positive pole of magnetron.

In addition, leave certain intervals between the inner of the central shaft of described anodal cylinder 2 and dividing plate 3, form working space 6; Be provided with coiled-coil filament 7 in the working space 6, filament 7 is made by the mixture of tungsten and thorium oxide, can emit hot electron under the heating of operating current, forms the negative pole of magnetron.

In addition, the upwards emission of hot electron in order to prevent that filament 7 from emitting is provided with barricade 8 in the upper end of filament 7; Launch barricade 9 under being provided with in the lower end of filament 7 downwards in order to prevent hot electron; The central part of following barricade 9 is formed with a through hole, after the cathode center lead-in wire of being made by metal molybdenum 10 passes through hole, be weldingly fixed on down barricade 9 below, be provided with the side lead-in wire of being made by metal molybdenum 11 in the bottom surface of described barricade 9 down and the interval between the central tap 10, the upper end of side lead-in wire 11 is weldingly fixed on down on the barricade 9.

In addition, the upper and lower opening place of described anodal cylinder 2 is provided with funnel shaped pole shoe 13 and the following pole shoe of being made by Ferrite Material 14 gone up respectively, and the following of the top and following pole shoe 14 of last pole shoe 13 is welded with columnar A-envelope 15 and F-envelope 16 in the brazing mode respectively; The upper end of A-envelope 15 is welded in the brazing mode and is used for outwards exporting on the A-ceramic member 17 of frequency electromagnetic waves, the lower end of F-envelope 16 is welded in the brazing mode and has been used on the insulating effect F-ceramic member 18, the upper end of described A-ceramic member 17 is connected in blast pipe 19 in the brazing mode, in order to make anodal cylinder 2 keep the vacuum seal state, the upper end of blast pipe 19 is sealed when cutting off.

In addition, be provided with antenna 20 in the described A-envelope 15, the effect of antenna 20 is the broken outwards output of high-frequency electromagnetic that will produce in the resonant cavity, and the lower end of described antenna 20 is connected on the dividing plate 3, and its upper end is fixed on the inner top surface of described blast pipe 19.

In addition, described anodal cylinder 2 top and below be respectively arranged with top magnetic core 21 and bottom magnetic core 22, top magnetic core 21 and bottom magnetic core 22 contact with the medial surface of yoke 1 respectively, form magnetic circuit with last pole shoe 13 and following pole shoe 14.

In addition, be provided with box filtering case 26 below the described yoke 1, for the high frequency clutter of decaying and flowing backwards, be provided with choke 27 in the filtering case 26, choke 27 forms with the lower end of F-lead-in wire 28 and is electrically connected, the through hole on the F-ceramic member 18 is run through on the top of F-lead-in wire 28, and 18 upper ends of described F-ceramic member are provided with pair of discs 29; Pass F-ceramic member 18 and make the F-of through hole go between 28, its upper end is welded on respectively on the bottom surface of disk 29, and the upper surface of described disk 29 is welding the lower end of central tap 10 and side lead-in wire 11 respectively.

In addition, be provided with capacitor 31 on the sidewall of described filtering case 26, the inner terminal of capacitor 31 forms with described choke 27 and is electrically connected, and is inserted with ferrite bar 32 in the choke 27, is used for absorbing the low frequency clutter.

In addition, be provided with several cooling fins 41 between the lateral wall of the madial wall of described yoke 1 and anodal cylinder 2; Be provided with antenna cap 42 above the described A-ceramic member 17, be used for protecting the welding position of blast pipe 19 upper ends.

The course of work of above-mentioned existing magnetron is: after the energized, voltage signal is added on central tap 10 and the side lead-in wire 11 by F-lead-in wire 28, and by by F-lead-in wire 28, central tap 10, filament 7, go up barricade 8, the closed circuit formed of barricade, side lead-in wire 11, disk 29 is powered to filament 7 down, filament 7 runaway electron that is heated under the effect of operating current, runaway electron forms electronic population.

In addition, provide driving voltage by side lead-in wire 11 positive poles, thereby in working space 6, form highfield to magnetron; Top magnetic core 21 is guided working space 6 with the magnetic line of force that bottom magnetic core 22 produces into along following pole shoe 14, and enters in the pole shoe 13 by working space 6, thereby forms high-intensity magnetic field in working space 6.

After the electronic population of overflowing from the surface of high temperature filament 7 enters working space 6, under the highfield effect, when dividing plate 3 moves, under the effect of high-intensity magnetic field, be subjected to the effect with the perpendicular power of its direction of motion, thereby move on the dividing plate 3 along helical trajectory.

Shown electronic population is the cycle to produce interference on dividing plate 3 with the inverse of higher-order of oscillation frequency multiple.In the resonant cavity between every pair of dividing plate 3, a pair of dividing plate 3 is in opposite directions formed a capacitor, and a pair of dividing plate 3 is in opposite directions formed an inductor with the anodal cylinder 2 that is connected dividing plate 3, and above-mentioned capacitor and inductor are formed an antiresonant circuit, and the resonance frequency of this resonant circuit is $f=\frac{1}{2\mathrm{\π}\sqrt{\mathrm{LC}}}.$ The frequency electromagnetic waves (being microwave) that described resonant circuit produces is outwards launched by dividing plate 3 and antenna 20.If magnetron is used for microwave oven, after the frequency electromagnetic waves that magnetron emits (being microwave) enters the heating chamber of microwave oven, shine on the food to be cooked, it is high frequency polarized that food molecule is taken place, the food molecule per second is vibrated 2,400,000,000 5 thousand ten thousand times, take place between the food molecule to rub and generate heat, thereby reach the purpose of heating and cooking food.

As shown in Figure 3 and Figure 4, the shortcoming of above-mentioned existing magnetron is: the bottom of A-ceramic member 17 is with the welded top of brazing mode and A-envelope 15 together, the end face of A-envelope 15 is formed with annular ridge 15a, and fin 15a and A-ceramic member 17 bottom surfaces closely are being welded together under the contact condition.From the enlarged drawing of Fig. 4 as can be seen, what form between fin 15a and A-ceramic member 17 bottom surfaces is not to contact, but face contact L.In this state, the fastness of brazing welding can reduce, and the welding position is easy to generate fine crackle when being subjected to external impact, causes the vacuum state of magnetron inside destroyed.

Summary of the invention

Technical problem to be solved by this invention is, overcomes the shortcoming of above-mentioned existing magnetron, and a kind of A-envelope brazed structure that can improve the magnetron that A-soldering and sealing connects fastness is provided.

In order to solve the problems of the technologies described above, the technical solution used in the present invention is: comprising: A-envelope and A-ceramic member; Be formed with the bimodal fin of ring-type protruding upward on the end face of described A-envelope, the bimodal fin of described ring-type closely contacts with the bottom surface of A-ceramic member and welds together in the brazing mode.

The cross section of the bimodal fin of described ring-type is " M " shape.

The recessed position of the bimodal fin of described ring-type is placed with the scolder copper cash.

The invention has the beneficial effects as follows: make A-bind between face and the A-ceramic member bottom surface and form dual annular solder, strengthened weld strength greatly, avoided the phenomenon in crack occurring, packed the sealing state of magnetron because of external impact makes the welding position.

Description of drawings

Fig. 1 is the structural representation of existing magnetron;

Fig. 2 is the sectional structure schematic diagram of magnetron shown in Figure 1;

Fig. 3 is the Welding Structure cutaway view of A-envelope in the existing magnetron;

Fig. 4 is the enlarged drawing of A portion among Fig. 3;

Fig. 5 is the cutaway view of the A-envelope brazed structure embodiment of magnetron of the present invention;

Fig. 6 is the enlarged drawing of B portion among Fig. 5.

Among the figure:

1: yoke 2: anodal cylinder

3: dividing plate 7: filament

15:A-envelope 16:F-envelope

17:A-ceramic member 21: top magnetic core

22: bottom magnetic core 100: bimodal fin

200: copper cash

Embodiment

Below in conjunction with the drawings and specific embodiments the present invention is described in further detail:

As shown in Figure 5 and Figure 6, the A-envelope brazed structure of the magnetron of present embodiment is: A-ceramic member 17 bottom surfaces weld together with the end face of brazing mode and A-envelope 15, be formed with the cross section protruding upward bimodal fin 100 of ring-type on the end face of described A-envelope 15 for " M " shape, scolder copper cash 200 is placed at the recessed position of described bimodal fin 100, and the end face with A-ceramic member 17 bottom surfaces and A-envelope 15 when making copper cash 200 fusings welds together.

The formation cross section for the method for the bimodal fin 100 of ring-type of " M " shape is on the end face of A-envelope 15, utilize sharp instrument on raw material, to carry out deep processing, it is rolling then working position to be pressed certain angle, makes it form the ring-type bimodal fin of cross section for " M " shape.

Then, be that scolder copper cash 200 is placed at the bimodal fin of the ring-type 100 recessed positions of " M " shape in the cross section that forms, again with bimodal fin 100 with heat after A-ceramic member bottom surface closely contacts.After scolder copper cash 200 was melted, bimodal fin 100 just welded together securely with A-ceramic member bottom surface.This welding manner makes between bimodal fin 100 and the A-ceramic member bottom surface and to form dual annular solder, has strengthened weld strength greatly, has avoided the phenomenon in crack occurring because of external impact makes the welding position, has packed the sealing state of magnetron.

Claims (3)

1. the A-of a magnetron seals brazed structure, comprise: A-envelope and A-ceramic member, it is characterized in that: be formed with the bimodal fin of ring-type protruding upward (100) on the end face of described A-envelope (15), the bimodal fin of described ring-type (100) closely contacts with the bottom surface of A-ceramic member (17) and welds together in the brazing mode.

2. the A-of magnetron according to claim 1 seals brazed structure, and it is characterized in that: the cross section of the bimodal fin of described ring-type (100) is " M " shape.

3. the A-of magnetron according to claim 1 seals brazed structure, and it is characterized in that: the recessed position of the bimodal fin of described ring-type (100) is placed with scolder copper cash (200).

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