KR930000550B1 - Magnetron for electric lange - Google Patents

Abstract

The magnetron for microwave oven has a center lead (6) and side lead (7) at the middle part of cathodic chamber (12), comprises a few protrusions (18) at the inner wall of cathodic chamber (12), a circular spacer (19) supported at the protrusions (18)(18). The spacer (19) is coated with an electromagnetic-wave absorber (21) of carbon or ferrite materials on the ceramic body (20). The electromagnetic- wave absorber (21) is composed of nickel-zinc (Ni-Zn) materials with a cesium (Cs) additive.

Description

Microwave Magnetron

1 is a cross-sectional view showing the structure of a magnetron for a conventional microwave oven.

(A) is a perspective view of the spacer used for the magnetron of a statue, (b) is a perspective view of the sleeve used for the magnetron of a statue.

3 is a cross-sectional view showing the structure of a magnetron for a microwave oven according to the present invention.

(A) of FIG. 4 is a cross-sectional view of the negative electrode chamber which is applied to the magnetron of the statue, and (b) is a perspective view of a spacer used for the magnetron of the statue.

Figure 5 (a) and (b) is a longitudinal sectional view and a perspective view showing another embodiment of a spacer applied to the microwave magnetron according to the present invention.

Figure 6 (a) and (b) is a longitudinal sectional view and a perspective view showing another embodiment of the in-phase.

* Explanation of symbols for main parts of the drawings

6: center lead 7: side lead

12: cathode compartment 18: jamming projection

19: spacer 20: ceramic body

21: unnecessary electromagnetic wave absorber

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetron for a microwave oven, and in particular, to simplify manufacturing and reduce manufacturing costs, to facilitate the assembly process, and to stably support the center lead and side leads without flow. It relates to a magnetron for a range.

Conventional microwave magnetrons, as shown in Figures 1 and 2, the anode cylinder (3) having a plurality of vanes (2) to which the anode strap (1) is fixed and the vanes (2) Antenna leads 4 coupled to each other, filaments 5 having a spiral shape emitting hot electrons, center leads 6 and side leads 7 for supplying power to the filaments 5, and ferrite magnets ( Upper and lower magnetic pole pieces 8 and 9 respectively installed on the upper and lower portions of the vanes 2 so as to focus the magnetic energy supplied from the not shown) into the working space between the filaments 5 and the vanes 2. ), The cathode chamber 12 supporting the anode cylinder 3, the upper and lower caps 10 and 11, which shield the hot electrons emitted from the filament 5, the center lead 6 and the side lead ( 7) the negative electrode ceramic 13 is inserted into the lower portion of the lower portion and the upper portion of the center lead 6 and the side lead (7) to absorb vibration It consists of a spacer 14 and a sleeve 15 inserted into an intermediate portion of the side lead 7 so as to prevent the spacer 14 from flowing down.

In the drawings, reference numerals 16 and 17 show connection terminals, respectively.

Such microwave oven magnetron affects the center lead 6 and the side lead 7 when external vibration is applied, and at this time, due to the left and right displacement of the center lead 6 and the side lead 7, As a result, disconnection of the filament 5 having weak strength is caused.

In order to prevent such a phenomenon, vibration of the center lead 6 and the side lead 7 is suppressed through the spacer 14 made of ceramic, which is an electrical non-conductor, on the top of the center lead 6 and the side lead 7. I'm making it.

In addition, the sleeve 15 is inserted into the middle portion of the side lead 7 to prevent the spacer 14 from flowing down.

However, in the conventional case as described above, since a separate sleeve 15 is inserted into the side lead 7 to support the spacer 14, the manufacturing cost is increased and the assembly process is complicated. In addition, even if the spacer 14 is supported by the sleeve 15, the spacer 14 may not be perfectly supported, and thus the spacer 14 may be somewhat affected by external vibration, and thus the filament 5 In addition to being a factor of disconnection, the filament 5 may be eccentric, resulting in a large amount of dark current.

SUMMARY OF THE INVENTION The main object of the present invention is to provide a magnetron for a microwave oven, which can reduce the number of parts, simplify the construction, reduce manufacturing costs, and facilitate the assembly process.

Another object of the present invention is to provide a magnetron for a microwave oven that can support the centriide and the side lead more stably without flowing.

Still another object of the present invention is to provide a magnetron for a microwave oven capable of more effectively absorbing the fifth harmonic and preventing a phenomenon that adversely affects other devices.

In order to achieve the object of the present invention as described above, in the magnetron for a microwave oven in which the center lead and the side lead penetrates the middle portion of the cathode subsidiary chamber, several hooks are formed on the inner wall of the cathode subsidiary chamber, There is provided a magnetron for a microwave oven, characterized in that a disk-shaped spacer is formed on the inner circumferential wall of the cathode compartment so that its peripheral edge is fixed to be supported by a locking projection.

Hereinafter, the microwave magnet according to the present invention will be described according to the embodiment shown in the accompanying drawings.

3 is a cross-sectional view showing the structure of a magnetron for a microwave oven according to the present invention. As shown here, in the conventional magnetron for a microwave oven, through which the center lead 6 and the side lead 7 penetrate the middle part of the cathode part chamber 12, the inner peripheral wall of the cathode part chamber 12 is formed. Several locking projections 18 are formed, and a disk-shaped spacer 19 having the same diameter as the inner diameter of the cathode subsidiary chamber 12 is fixed to the inner circumferential wall of the cathode subsidiary chamber 12, and the lower surface of the spacer 19 is fixed. The peripheral portion is configured to be supported by the locking projection (18).

The spacer 19 is applied to the upper surface of the ceramic body 20 by applying the unwanted electromagnetic wave absorber 21 to a predetermined thickness, the unwanted electromagnetic wave absorber 21 is made of carbon or ferrite material, in particular sesame ( When nickel-zinc (Ni-Zn) ferrite using Cs) is used as the unwanted electromagnetic wave absorption 21, the fifth harmonic (12.25 GHz), which is a problem due to noise of satellite broadcasting, is radiated to the lower part of the magnetron (cathode part). It can absorb and double the inhibitory effect of the fifth harmonic.

In addition, when the disk-shaped spacer 19 itself is formed as an electron absorber, the center lead 6 and the side lead 7 can be supported and the fifth harmonic suppression effect can be obtained.

In the figure, reference numerals 19a and 19b show the lead insertion holes of the disc-shaped spacer 19, respectively, and the same reference numerals are given to the same parts as the prior art configurations.

In the magnetron for a microwave oven according to the present invention configured as described above, the spacer 19 is coupled to the center lead 6 and the side lead 7, and the lower end of the spacer 19 has a negative electrode portion ( The center lead 6 and the side lead 7 are more firmly secured by the spacer 19 by being fastened to the inner circumferential wall of the negative electrode chamber 12 so as to be supported by several locking projections 18 formed on the inner circumferential wall of 12). In this way, it is possible to prevent the flow of the center lead 6 and the side lead 7 due to the external vibration, thereby preventing the disconnection of the filament 5.

In addition, the fifth harmonic among the unwanted harmonics radiated to the lower portion of the magnetron when the magnetron is oscillated, is applied to the spacer 19 formed of the electromagnetic wave absorber 21 or the electromagnetic wave absorber itself applied to the ceramic body 20 of the spacer 19. Absorption will not adversely affect adjacent equipment.

Meanwhile, FIGS. 5 and 6 show another embodiment of the spacer 19 according to the present invention, and the boss 19c having a predetermined length protruding from the upper surface or the upper and lower portions in the middle of the ceramic body 20 ( 19d) 19c 'and 19d' are formed, and the center lead 6 and the side lead 7 into the insertion holes 19a and 19b of the bosses 19c, 19d and 19c 'and 19d'. ), The center lead 6 and the side lead 7 can be supported more stably.

In the microwave magnetron according to the present invention as described above, the center lead and the side lead can be firmly fixed by fixing the spacer to the disc-shaped seating protrusion on the cathode compartment, thereby eliminating the use of a separate sleeve. In addition to reducing the number of parts and facilitating the assembly process, there is an effect of more effectively absorbing the fifth harmonic to prevent adverse effects on other devices.

Claims (6)

In the conventional magnetron for a microwave oven in which the center lead 6 and the side lead 7 penetrate the middle part of the cathode compartment 12, several locking projections 18 are placed on the inner circumferential wall of the cathode compartment 12. And a disc-shaped spacer (19) formed on the inner circumferential wall of the cathode part chamber (12) so as to be coupled and fixed so that the peripheral edge thereof is supported by the locking projection (18). The magnetron for microwave oven according to claim 1, wherein the spacer (19) is coated with an unnecessary electromagnetic wave absorber (21) on the upper surface of the ceramic body (20). The magnetron for a microwave oven according to claim 2, wherein the unwanted electromagnetic wave absorber is made of carbon or ferrite. The magnetron for a microwave oven according to claim 2, wherein the unnecessary electromagnetic wave absorber (21) is formed of a ferrite material of nickel-zinc (Ni-Zn) with cesium (Cs) as an additive. 3. The microwave oven according to claim 2, wherein bosses 19c, 19d, 19c ', 19d' having a predetermined length protruding upward or downward are formed in the middle of the spacer 19. Dragon magnetron. The magnetron of claim 1, wherein the spacer is formed of a radio wave absorber itself.