KR19990020611A - Heater Fixing Structure of Microwave Oscillation Tube for Microwave Oven - Google Patents

Abstract

In the present invention, the cathode 132 is heated by the heat of the heater 120 to emit hot electrons, and the hot electrons are accelerated by the potential difference between the first and second grids 134 and 142 to generate microwaves. The heater fixing structure of the ultra-high frequency oscillation tube for, the cathode 132 is composed of a cathode mounting portion 210 and the heater mounting portion 220 is mounted to the heater 120 is inserted, the heater mounting portion 220 At the bottom of the plurality of outlets 222 formed at equal intervals so that the first terminal 122 of the heater 120 is drawn out and the outlet 222 so that the second terminal 124 of the heater 120 is drawn out. A heater housing 200 having a drawing hole 224 formed adjacent to any one of the plurality of protrusions, and a plurality of protrusions 310 facing inward at equal intervals along an upper outer surface thereof, and the heater housing is formed on the protrusion 310. The cathode 132 inserted into the cathode mounting portion 210 of the 200. It is supported, the heater 120 is inserted into the protrusion 310, the outlet 322 and the outlet (32) to correspond to the outlet 222 and the outlet 224 formed in the bottom of the heater mounting portion 220 ( 324 is formed on the bottom, characterized in that made of a ceramic holder 300 is pressed into the heater mounting portion 220 of the heater housing 200, the heater is inserted into and fixed to the ceramic holder, the assembly labor It is easy to assemble while saving, and has an effect of preventing the heater terminal and the housing from being shorted.

Description

Heater Fixing Structure of Microwave Oscillation Tube for Microwave Oven

The present invention relates to an ultra-high frequency oscillation tube for a microwave oven, and more particularly, to a heater fixing structure of an ultra-high frequency oscillation tube that can improve the assembly structure of a heater to prevent a short and reduce the number of assembly processes.

As is well known, magnetron is employed as a microwave oven for microwaves. However, such a conventional magnetron for a microwave oven requires a high voltage transformer and a high pressure diode according to a high pressure driving, and thus, there is a problem in safety, and a magnet is needed because it adopts a resonance method by electromagnetic movement in an electromagnetic field. There was a problem that the weight is heavy and the manufacturing cost is high.

To solve this problem, Klystron disclosed in U.S. Patent No. 5,541,391 has been adopted as an ultra-high frequency oscillation tube, but the microwave oven employing such Klystron still applies high voltage of DC 4KV. Since the product must be insulated from the low-klystron body, the product is heavy and the manner of movement of the electrons is complicated. Therefore, the cooling structure is complicated, the structure having a large number of cavities, and the magnet is required because the electron beam focusing structure is required. Since a filter is required, the structure has a complicated disadvantage.

In this regard, the present applicant has proposed a Korean microwave application No. 97-36327, a microwave microwave oscillation tube having a simple structure, which can eliminate the risk of high voltage and achieve a light weight. As shown in FIG. 1, the ultra-high frequency oscillation tube is mounted on the upper surface of the heater 120 by placing the cathode 132 as a ring-shaped disk-shaped electron radiator in an indirect heating method and generating heat by the heater 120. When the cathode 132 is heated to about 600-1200 ° C. by the indirect heating method, hot electrons are emitted, and the released hot electrons are biased to the first grid 134 arranged at predetermined intervals on the cathode 132. As it is applied, it controls and focuses on the input cavity 130.

The electrons focused on the input cavity 130 are densely modulated by the automatic shielding function of the bias power of the first grid 134 to pass through the first grid 134, and at this time, the input / output cavities 130 and 140 insulated from each other. When the operating voltage is applied, the potential difference is generated therebetween, and electrons passing through the first grid 134 are accelerated to pass through the second grid 142, so that surface current is generated in the output cavity 140. Induced. As a result, microwaves are formed in the output cavity 140, and the formed microwaves penetrate through the center of the anode 146 and are radiated through the antenna 150 formed in the output cavity 140. For this purpose, the coupling end 152 of the antenna 150 is located in the output cavity 140.

Meanwhile, a feed rod 160 for feeding back part of the microwaves formed in the output cavity 140 to the input cavity 140 is installed at the center between the input / output cavities 130 and 140 to amplify and resonate the power of the microwave. .

However, such a conventional microwave microwave tube for fixing the heater 120 in the heater housing 180 for mounting the cathode 132 on the upper surface, as shown in FIG. Is formed and the heater 120 is inserted into the hole 182 of the ceramic insulator 180 by using the ceramic insulator 180 having the grooves 184 formed along the outer circumferential surface, and the flow and contact of the heater 120 is made. After inserting the ceramic insulator 180 into the band 190 having a shape corresponding to the groove 184 of the ceramic insulator 180, the band 190 is placed on the base plate (the lower surface of the heater housing 180). 194), the conventional heater fixing structure has a large assembly time, and when the heater between ceramic insulators is stretched and sags downward, there is a concern that they are shorted in contact with each other.

Accordingly, the present invention is to provide a heater fixing structure of the ultra-high frequency oscillation tube which can prevent the short and reduce the number of assembly process by injecting a separate ceramic holder in the heater housing and fixing the heater to the holder. .

As a means for achieving this object, the heater fixing structure of the present invention is the cathode is heated by the heat of the heater to emit hot electrons, the hot electrons are accelerated by the potential difference of the first and second grid electrons to generate ultra-high frequency In the microwave oscillation tube for a microwave, the cathode mounting portion of the upper surface is inserted into the cathode and the heater mounting portion to which the heater is mounted, a plurality of formed at equal intervals so that the first terminal of the heater is drawn out at the bottom of the heater mounting portion A heater housing in which a drawing hole is formed adjacent to one of the outlets so that the outlet and the second terminal of the heater are drawn out, and a plurality of protrusions inwardly spaced along the upper outer surface are formed, and the heater housing is formed on the protrusions. The cathode inserted into the cathode mounting portion of the support is supported, and the heater is inserted into the projection. The outlet and the outlet are formed in the bottom to correspond to the outlet and the outlet formed in the bottom of the heater mounting portion, characterized in that made of a ceramic holder that is press-fit fixed in the heater mounting portion of the heater housing.

According to an embodiment of the present invention, the first terminal of the heater is withdrawn through the outlet of the ceramic holder and the heater housing, the second terminal of the heater is withdrawn through the outlet of the ceramic holder and the heater housing to the bottom of the heater housing It is preferable to be welded and fixed.

Since the heater fixing structure of the present invention is inserted into and fixed to a ceramic holder, the heater fixing structure is easily assembled while reducing the number of assembly labor compared to using a plurality of ceramic structures for insulating the heater, and prevents the heater terminals and the housing from shorting. It is effective.

1 is a cross-sectional view showing the structure of a conventional ultra-high frequency oscillation tube used as an ultra-high frequency oscillation tube for a microwave oven,

FIG. 2 is an enlarged detailed view of the heater fixing structure of FIG. 1;

Figure 3 is a perspective view showing a ceramic holder of the heater fixing structure according to an embodiment of the present invention,

4 is an assembled sectional view of the heater fixing structure of the present invention.

Explanation of symbols for main parts of the drawings

120: heater 130: input cavity

132: cathode 134: first grid

140: output cavity 142: second grid

146: anode 150: antenna

160: feedback rod 200: heater housing

210: cathode mounting 220: heater mounting

222, 322: outlet 224, 324: outlet

300: ceramic holder 310: protrusion

Hereinafter, with reference to the accompanying drawings will be described in detail the heater fixing structure of the microwave oven for microwave oven according to a preferred embodiment of the present invention. For convenience of explanation, the same reference numerals are given to the same configuration as in the prior art.

3 shows a ceramic holder 300 which is a characteristic configuration of the heater fixing structure of the present invention, and FIG. 4 shows the heater fixing structure of the present invention in which the ceramic holder 300 of FIG. 3 is coupled to the heater housing 200. Doing.

As shown in the figure, the heater fixing structure of the present invention consists of a heater housing 200 and a ceramic holder 300, the heater housing 200 is the cathode 132 is inserted into the cathode mounting portion 210 of the upper surface The heater 120 is mounted to the heater mounting unit 220.

The heater mounting unit 220 may also allow the plurality of outlets 222 and the second terminal 124 of the heater 120 to be drawn out at equal intervals so that the first terminal 122 of the heater 120 is drawn out at the bottom thereof. A lead hole 224 is formed adjacent to any one of the outlets 222.

The ceramic holder 300 is press-fitted into the heater mounting part 220 of the heater housing 200. The ceramic holder 300 has a plurality of protrusions 310 inwardly spaced inward along the upper outer surface thereof, and the cathode inserted into the cathode mounting portion 210 of the heater housing 200 is formed on the protrusion 310. 132 is supported, and the heater 120 is inserted into the protrusion 310.

In addition, the ceramic holder 300 has an outlet 322 and an outlet 324 formed at the bottom to correspond to the outlet 222 and the outlet 224 formed at the bottom of the heater mounting unit 220.

The heater fixing structure of the present invention configured as described above presses and fixes the ceramic holder 300 to the heater mounting portion 220 of the heater housing 200, and then the heater 120 is moved into the protrusion 310 of the ceramic holder 300. Inserts the first terminal 122 of the heater 120 to the outside through the outlet 322 of the ceramic holder 300 and the outlet 222 of the heater housing 200, and the second terminal 224 is removed. The lead is drawn out through the lead-out hole 324 of the ceramic holder 300 and the lead-out hole 224 of the heater housing 200 to be fixed to the bottom of the heater housing 200 by welding. Thereafter, the cathode 132 is mounted on the cathode mounting portion 210 of the heater housing 200 to be mounted on the protrusion 310 of the ceramic holder 300 to complete the assembly.

As described above, the heater fixing structure of the microwave microwave oscillation tube of the present invention has a heater inserted into and fixed to a ceramic holder, and thus requires more labor compared to a conventional heater fixing structure using a plurality of ceramic structures for insulating the heater. It is easily assembled while saving, and there is an effect of preventing the heater terminal and the housing from being shorted.

Claims (2)

In a heater fixing structure of a microwave high frequency oscillation tube for microwave oven, in which a cathode is heated by heat generation of a heater to emit hot electrons, and the hot electrons are accelerated by a potential difference between the first and second grids to generate ultra-high frequency. The cathode mounting part of the upper surface into which the cathode is inserted and the heater mounting part in which the heater is mounted, the bottom of the heater mounting portion has a plurality of outlets formed at equal intervals so that the first terminal of the heater is drawn out and the second terminal of the heater A heater housing in which a drawing hole is formed adjacent to one of the outlets to be drawn out; A plurality of protrusions inwardly spaced inward are formed along the upper outer surface, and the cathode inserted into the cathode mounting portion of the heater housing is supported on the protrusion, the heater is inserted into the protrusion, and the heater mounting portion The heater fixing structure of the microwave oven tube for microwave oven characterized in that the outlet and the outlet is formed in the bottom to correspond to the outlet and the outlet formed in the bottom, made of a ceramic holder that is pressed in the heater mounting portion of the heater housing. The heater of claim 1, wherein the first terminal of the heater is led out through the outlet of the ceramic holder and the heater housing, and the second terminal of the heater is led out through the outlet of the ceramic holder and the heater housing. Heater fixing structure of the microwave oven for microwave oven, characterized in that the welding is fixed to the bottom of the housing.