CN1567520A - Seal ring arrangement for magnetron - Google Patents

Abstract

The invention discloses a sealing ring setting structure of magnetic controlled tube, and the magnetic tube: there is an anode cylinder acting as an anode and a vane arranged inside a magnetic yoke, there is a lamp filament acting as a cathode arranged in the center where the vane is arranged, an A-room and an A-ceramic are in turn connected above the anode cylinder in a brazing mode and an F-room is connected on the bottom side of the anode cylinder in a brazing mode, a top magnet and a bottom one are arranged to surround the A- and F- rooms, an power supply input part is arranged on the bottom side of the magnetic yoke and a high-frequency output part arranged on the top side of the magnetic yoke, a sealing pad fro preventing electromagnetic wave leakage is arranged on the output part of the sealing ring, and for completely preventing the electromagnetic wave leakage, the sealing ring is fixed on the top end of the A-room. It uses the sealing ring to fix the sealing pad so that there will be no gap between the A-room and sealing ring, offsetting the electromagnetic wave leakage from the gap.

Description

The sealing ring of magnetron is provided with structure

Technical field

The sealing ring that the present invention relates to magnetron is provided with structure, and the magnetron sealing ring of the electromagnetic wave noise of the slot leakage trace that takes place in the time of especially can preventing by assembling A-chamber and sealing ring is provided with structure.

Background technology

Usually magnetron is installed on microwave oven or the illumination machine, in order to change electric energy into high-frequency energy.

As shown in Figure 1, 2, the magnetron structures of prior art is: be provided with the anode cylinder 2 that adopts the cylinder type that copper pipe makes in the inboard that upper magnet yoke 1a and lower yoke 1b are combined into the yoke 1 of " mouth " font haply, be provided with several blades 3 that constitute oscillator in the inside of anode cylinder 2.Blade 3 is towards the axis direction spaced set, and alternately combines inboard grading ring 4 and outside grading ring 5 on the both sides up and down of its head end, so that anode cylinder 2 and blade 3 constitute anodes.

Be provided with on the central shaft of anode cylinder 2 and the head end of blade 3 between form the filament 7 of the circle spirality of certain action space 6, filament 7 adopts tungsten and thorium oxide mixture to make, and constitutes by the supply of current heating and discharge thermionic negative electrode.

The upper end of filament 7 is provided with the upwards top barrier lid 8 of diffusion of hot electron that prevention discharges; The lower end is provided with the bottom shield lid 9 that prevents hot electron diffusion downwards; Inserted the center conductor 10 that Mo is made on the through hole that the central authorities of bottom shield lid 9 form; Be fixed on top barrier lid 8 below, and engage in its lower section fixed with center conductor 10 at a distance of certain distance, adopt the upper end of the side lead 11 that Mo makes.

Utilize the upper pole piece 13 and the lower magnetic pole sheet 14 of the sheet of magnetic making on the upper and lower sides peristome of described anode cylinder 2, and utilize the mode of brazing to be connected the A-chamber 15 and the F-chamber 16 of cylinder type at the upside of upper pole piece 13 and the downside of lower magnetic pole sheet 14.Utilize the mode of brazing to be provided with at the upside of A-chamber 15 and the downside of F-chamber 16 to the A-of external emission high frequency potsherd 17 and F-potsherd 18 with insulating effect, and the upside of A-potsherd 17 utilizes the mode of brazing to connect blast pipe 19, and the upper end of blast pipe 19 is sealed for the cut while of the inside that seals anode cylinder 2.

Be provided with the antenna 20 that the output oscillator sends high frequency in the inboard of A-chamber 15, and be provided with blade 3 in the lower end of antenna 20, the upper end be fixed on blast pipe 19 inboards above.

The upside of cylinder 2 and downside be provided with contact with the medial surface of yoke 1 on magnet 21 and lower magnet 22, and constitute magnetic fields with described upper and lower pole piece 13,14.

Be provided with the filter cartridge 26 of box type at the downside of yoke 1, and side is provided with the choking-winding 27 of a pair of weakening adverse current to the high-frequency noise of input part within it, and an end of choking-winding 27 is connected the lower end that is inserted in a pair of F-lead 28 in the through hole that forms on the F-potsherd 18.

The upper end that is inserted in the F-lead 28 in F-potsherd 18 through holes respectively be connected F-potsherd 18 upside pair of discs 29 below, the top lower end that has connected center conductor 10 and side lead 11 of disk 29.

On the sidewall of filter cartridge 26, be provided with electric capacity 31, and the medial end of electric capacity 31 is connected on the choking-winding 27, and on the length direction of choking-winding 27, is provided with the ferrite 32 that absorbs low-frequency noise

Be provided with cooling fin 41 between the outer cylinder of the inner cylinder of yoke 1 and anode cylinder 2, and on the upside of A-potsherd 17, be provided with the antenna cover 42 of the junction that can protect blast pipe 19.

As shown in Figure 3, be provided with the sealing gasket 51 that prevents that electromagnetic wave noise from making to the metal material of efferent leakage on the outside of 15 upper ends, A-chamber, and sealing gasket 51 is fixing by the sealing ring 52 that is pressed into the outdoor cylinder of A-.

As above in the general magnetron of Gou Chenging, external power source is supplied to filament 7 by the closed-loop path that is made of center conductor 10, filament 7, top barrier lid 8, bottom shield lid 9, side lead 11, disk 29 F-lead 28 constitutes between center conductor 10 and side lead 11 with electric current, filament 7 is heated and discharges hot electron, and constitutes electronic population by the hot electron of being emitted.

Under the effect of the driving voltage that is fed to anode by side lead 11, produce stronger electric field in the action space 6, and the flux that last magnet 21 and lower magnet 22 produce is in lower magnetic pole sheet 14 is directed to action space 6, and move to upper pole piece 13 by action space 6, in action space 6, form stronger magnetic field.

Be discharged into from filament 7 surfaces under the stronger effect of electric field of hot electron in action space 6 of action space 6 inside, when blade 3 moves, be subjected to the effect of magnetic field force in vertical direction, carry out screw and arrive blade 3.

The electronic population that forms in electronic motion is the cycle blade 3 to be interfered with the inverse of higher-order of oscillation frequency multiple, the space relative with blade 3, promptly in oscillator, act on the capacitive component of the static content between relative blade 3 and on the loop, together constitute oscillation circuit in parallel by the described inductance composition that constitutes towards relative blade 3 and the anode cylinder 2 that is connected two blades 3, send by formula $f=\frac{1}{2\mathrm{\π}\sqrt{\mathrm{LC}}}$ The frequency of oscillation of determining, and the high frequency that is produced is outwards launched by antenna 20, vibration food is 2,400,000,000 5 thousand ten thousand times in the per second, and utilizes the frictional heat heat food that produces.

Simultaneously, when producing high-frequency energy, the electromagnetic wave noise that leaks to input part can not leak into the outside under the effect of filter cartridge 26, and can be to external leakage under the effect of the sealing gasket 51 outside the electromagnetic wave noise that efferent leaks is being arranged at upper end, A-chamber.

But, in the magnetron of the prior art design that as above constitutes, the electromagnetic-wave leakage of efferent reduces under the effect of sealing gasket 51 to some extent, but when assembling, will inevitably have the slit between the sealing ring 52 of fixing seal pad 51 and the A-chamber 15, so electromagnetic wave still has sub-fraction and lets out.

Summary of the invention

The sealing ring that technical problem to be solved by this invention provides a kind of magnetron is provided with structure, makes between A-chamber and the sealing ring and can not produce the slit, can prevent electromagnetic-wave leakage up hill and dale.

In order to solve the problems of the technologies described above, the technical solution used in the present invention is: a kind of sealing ring of magnetron is provided with structure, described magnetron is: be provided with the anode cylinder and the blade that use as anode in the inboard of yoke, and be provided with the filament that is provided with on the centre of blade as negative electrode, the top of anode cylinder utilizes the mode of brazing to connect A-chamber and A-potsherd successively, downside utilizes the mode of brazing to connect the F-chamber, and be provided with, lower magnet, in order to surround A-chamber and F-chamber, the input part of power supply is provided downside being provided with of yoke, and on upside, be provided with output high-frequency energy efferent, on the sealing ring efferent, be provided with the sealing gasket that prevents electromagnetic-wave leakage, in order thoroughly to have prevented electromagnetic leakage, described sealing ring is fixed on the upper end, A-chamber.

Described sealing ring vertically is provided with, and comprising: the upper end be bonded on the A-potsherd below, and the lower end is bonded on the junction of A-chamber upper end; Lower end in the junction is outwardly-bent, the supporting structure of the medial end of supporting sealing gasket; The crooked to the inside choke that constitutes choke structure.

By above explanation as can be known, the magnetron sealing ring of the present invention's design is provided with in the structure, has fixed sealing ring in the upper end of A-chamber, and has utilized sealing ring to fix sealing gasket, therefore can not produce any slit between A-chamber and the sealing ring, stop the leakage of electromagnetic wave noise fully.And sealing ring is fixed on the upper end of A-chamber in advance, has reduced assembling procedure, and has reduced manufacturing cost.

Description of drawings

Fig. 1 is the stereogram of the magnetron of prior art.

Fig. 2 is the skiagraph of Fig. 1.

Fig. 3 is the enlarged drawing that the sealing gasket of prior art is provided with state.

Fig. 4 is the skiagraph that the sealing ring that has been equipped with the present invention's design is provided with the magnetron of structure.

Fig. 5 is the amplification profile diagram that sealing ring that the present invention designs is provided with structure.

Among the figure, 1: yoke; 2: the anode cylinder; 3: blade; 7: filament; The 15:A-chamber; The 16:F-chamber; The 17:A-potsherd; 21: go up magnet; 22: lower magnet; 51: sealing gasket; 100: sealing ring; 100a: junction; 100b: supporting structure; 100c: choke.

Embodiment

Below in conjunction with the drawings and specific embodiments the sealing ring of magnetron of the present invention being provided with structure is described in further detail:

As shown in Figure 4, the basic structure of magnetron is same as the prior art, uses identical symbol for identical part here, and omits detailed explanation.

As shown in Figure 5, be provided with A-chamber 15 in the inboard of yoke 1, and in the arranged outside of A-chamber 15 on magnet 21, and above last magnet 21, be provided with the sealing gasket 51 that utilizes sealing ring 100 fixing, described sealing ring 100 is fixed on the upper end of A-chamber 15, when having saved assembling procedure, prevent that electromagnetic wave noise from leaking to efferent.

Described sealing ring 100 vertically is provided with, and comprising: the upper end be bonded on A-potsherd 17 below, and the lower end is bonded on the junction 100a of 15 upper ends, A-chamber; Lower end at junction 100a is outwardly-bent, the supporting structure 100b of the medial end of supporting sealing gasket 51; Crooked to the inside, the choke 100c of formation choke structure.

The magnetron sealing ring of the present invention's design that as above constitutes is provided with in the structure, utilizes sealing gasket 51 to prevent that the yoke 1 inboard electromagnetic wave noise that produces from passing through yoke 1 to external leakage.And, the sealing gasket 51 that utilizes sealing ring 100 to fix to stop high-frequency noise, and the sealing ring 100 among the present invention engages the upper end that is fixed on A-chamber 15, therefore, the problem of the electromagnetic-wave leakage that has taken place when having solved assembling sealing ring in the past up hill and dale.

And, being provided with in the structure at aforesaid sealing ring 100, sealing ring 100 is fixed on the upper end of A-chamber 15 in advance, has therefore saved the assembling procedure of sealing ring 100, because the minimizing of assembling procedure has reduced manufacturing cost.

Claims (2)

1, a kind of sealing ring of magnetron is provided with structure, described magnetron is: be provided with the anode cylinder and the blade that use as anode in the inboard of yoke, and be provided with the filament that is provided with on the centre of blade as negative electrode, the top of anode cylinder utilizes the mode of brazing to connect A-chamber and A-potsherd successively, downside utilizes the mode of brazing to connect the F-chamber, and be provided with, lower magnet, in order to surround A-chamber and F-chamber, the input part of power supply is provided downside being provided with of yoke, and on upside, be provided with output high-frequency energy efferent, on the sealing ring efferent, be provided with the sealing gasket that prevents electromagnetic-wave leakage, it is characterized in that described sealing ring (100) is fixed on the upper end, A-chamber (15) in order thoroughly to have prevented electromagnetic leakage.

2, the sealing ring of magnetron according to claim 1 is provided with structure, it is characterized in that described sealing ring (100) is vertical to be provided with, and comprising: the upper end be bonded on A-potsherd (17) below, and the lower end is bonded on the junction (100a) of upper end, A-chamber (15); The lower end of (100a) is outwardly-bent in the junction, the supporting structure (100b) of the medial end of supporting sealing gasket (51); The crooked to the inside choke (100c) that constitutes choke structure.

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