KR19990056503A - Microwave Oscillation Tube for Microwave Oven - Google Patents

Abstract

The present invention relates to an ultra-high frequency oscillation tube for a microwave oven. The present invention includes a seating portion 281 on which the first grid 134 is seated and a flange portion 282 disposed on the blocking capacitor 136. The flange portion 282 includes a first grid holder 280 in which a heat transfer preventing groove 283 is formed to block heat radiated from the heater from being discharged to the outside, thereby radiating from the heater in the flange portion of the first grid holder. Since the heat transfer preventing groove is formed to block the discharge of the heat to the outside, the amount of heat leaking to the outside through the first grid holder is reduced, and the time taken for the cathode to reach a predetermined operating temperature is shortened.

Description

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 reduce the amount of heat emitted from a heater to the outside to reduce the time taken for the cathode to reach a predetermined operating temperature. It relates to a grid holder of a microwave oven.

The applicant's Korean Patent Application No. 97-36327 proposes a microwave oven tube for microwave oven which is simple in structure and can reduce the risk due to high voltage and achieve light weight. In this ultra-high frequency oscillation tube, as shown in FIG. 1, the cathode 132 as a ring-shaped disk-shaped electron radiator is disposed on the upper surface of the heater 120 by indirect heating, and the heat generated by the heater 120 is generated. When the cathode 132 is heated to about 600-1200 ° C., the cathode 132 emits hot electrons, 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 is controlled and focused in the input cavity 130.

The electrons focused on the input cavity 130 in the space surrounded by the cathode 132, the first grid 134, and the blocking capacitor 136 are densely modulated by the automatic shielding function of the bias power supply of the first grid 134 to be formed. When an operating voltage is applied between the input and output cavities 130 and 140 that are insulated from each other through the first grid 134, a potential difference is generated therebetween to accelerate electrons passing through the first grid 134. As it passes through the second grid 142, surface current is induced in the output cavity 140. 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. .

The first grid 134 is supported by the first grid holder 182, as shown in FIG. 2, wherein the flange portion of the first grid holder 182 has a blocking capacitor 136 on the heater support 180. The second grid 142 is supported by the second grid holder 184, and the first and second grid holders 184 are maintained at predetermined intervals by the ceramic pins 172.

Since the microwave oscillation tube for microwaves heats the cathode by an indirect heating method, the heat emitted by the heater 120 is discharged to the outside through the first grid holder 182, as shown by the arrow, the cathode ( 132 takes a long time to reach a predetermined operating temperature.

Accordingly, the present invention is thus devised, the first grid holder having a heat transfer preventing structure that can reduce the amount of heat emitted from the heater to the outside to shorten the time it takes for the cathode to reach a predetermined operating temperature It is to provide an ultra-high frequency oscillator tube for microwave.

As a means for achieving the above object, the microwave oven for microwave oven according to an embodiment of the present invention, the heating means; A cathode disposed in the heat generating unit to emit electrons; A first grid disposed on the cathode to form an input cavity with the cathode and the blocking capacitor, the first grid focusing electrons emitted from the cathode according to the formed bias voltage; A second grid disposed on the first grid and through which electrons passing through the first grid pass; A microwave oven for microwave oven comprising an anode disposed on the second grid and forming an output cavity together with the second grid, wherein the planar portion is disposed on the seating portion on which the first grid is seated and the blocking capacitor. It is provided with a branch, the flange portion is characterized in that it comprises a first grid holder is formed with a heat transfer preventing groove for blocking the heat emitted from the heater to be discharged to the outside.

Microwave microwave oscillation tube according to another embodiment of the present invention, the heating means; A cathode disposed in the heat generating unit to emit electrons; A first grid disposed on the cathode to form an input cavity with the cathode and the blocking capacitor, the first grid focusing electrons emitted from the cathode according to the formed bias voltage; A second grid disposed on the first grid and through which electrons passing through the first grid pass; A microwave oven for microwave oven comprising an anode disposed on the second grid and forming an output cavity together with the second grid, wherein the planar portion is disposed on the seating portion on which the first grid is seated and the blocking capacitor. And a branch, wherein the flange portion includes a first grid holder having a heat transfer prevention hole arranged to be circumferentially arranged along the flange portion to block heat emitted from the heater to the outside.

According to the present invention, since the first grid holder of the microwave oven tube of the present invention has a heat transfer preventing groove or hole for preventing heat radiated from the heater from being emitted to the outside of the flange portion, the first grid holder The amount of heat leaking out through the holder is reduced, which shortens the time taken for the cathode to reach a predetermined operating temperature.

1 is a cross-sectional view showing the overall structure of the microwave oven for microwave oven,

2 is a partial cross-sectional view showing a conventional first grid structure,

3 is a perspective view showing a first grid structure according to an embodiment of the present invention;

4 is a partial cross-sectional view showing a path of heat transferred through the first grid of FIG. 3,

5 is a perspective view showing a first grid structure according to another preferred embodiment of the present invention;

6 is a cross-sectional view of the first grid shown in FIG. 5,

7 is a perspective view showing a first grid structure according to another preferred embodiment of the present invention.

<Description of the symbols for the main parts of the drawings>

120: heater 130: input cavity

134: first grid 140: output cavity

142: second grid 146: anode

150: antenna 160: feedback rod

180: heater holder 280, 380: first grid holder

281, 381: Mounting part 282, 382: Flange part

283: heat transfer prevention groove 383: heat transfer prevention hole

Hereinafter, with reference to the accompanying drawings will be described in detail a microwave microwave oscillation tube for 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.

Although the characteristic elements of the present invention are shown in Figs. 3 to 6, reference is made to Fig. 1 to describe the microwave oven tube of the present invention.

The microwave microwave tube of the present invention includes a heater 120 as a heating means, a cathode 132 disposed on the heater 120 to emit electrons, and a cathode 132 and a blocking capacitor disposed on the cathode 132. An input cavity 130 is formed together with 136, and is disposed on the first grid 134 and the first grid 134 for focusing electrons emitted from the cathode 132 according to the formed bias voltage. A second grid 142 through which electrons pass through the grid 134 and an anode 146 disposed on the second grid 142 to form an output cavity 140 together with the second grid 142. Include. Such structures and operations are disclosed in more detail in the currently pending Korean Patent Application No. 97-36327, which is incorporated herein by reference.

According to the first embodiment of the present invention, the first grid holder 280, as shown in Figure 3, on the grid seating portion 281 and the blocking capacitor 136 on which the first grid 134 is seated. It consists of the flange part 282 attached. The flange portion 282 of the first grid holder 280 is formed with an annular heat transfer blocking groove 283 for blocking the heat released from the heater to be discharged to the outside. Therefore, as shown in FIG. 4, heat emitted from the heater is discharged to the outside through the first grid holder 280 along the path supported by the arrow, wherein the heat transfer cross-sectional area is prevented by the heat transfer preventing groove 283. As a result, the amount of heat released to the outside through the first grid holder 280 is reduced, thereby shortening the time taken for the cathode 132 to reach a predetermined operating temperature.

5 and 6 show a first grid holder 380 according to a second embodiment of the present invention. In the first grid holder 380 according to the second exemplary embodiment of the present invention, the flange 382 includes a flange 382 having a heat transfer preventing hole 383 for blocking heat emitted from the heater to the outside. It is formed in the circumferential direction. The heat transfer prevention holes 383 may be arranged in two rows, as shown in FIG. 7, where each hole is preferably alternately disposed.

As described above, the first grid holder of the microwave microwave oscillation tube of the present invention has a heat transfer preventing groove or hole for preventing heat emitted from the heater from being emitted to the outside of the flange portion, and thus, the first grid holder. Through the amount of heat leaking to the outside is reduced, the time taken for the cathode to reach a predetermined operating temperature is shortened.

Claims (6)

Heating means; A cathode disposed in the heat generating unit to emit electrons; A first grid disposed on the cathode to form an input cavity with the cathode and the blocking capacitor, the first grid focusing electrons emitted from the cathode according to the formed bias voltage; A second grid disposed on the first grid and through which electrons passing through the first grid pass; In the microwave oven tube disposed on the second grid, including an anode to form an output cavity with the second grid, A first grid holder having a seating portion on which the first grid is seated and a flange portion disposed on the blocking capacitor, wherein the flange portion is provided with a heat transfer preventing groove for preventing heat radiated from the heater from being discharged to the outside; Microwave oscillation tube for a microwave, characterized in that it comprises a. The microwave oscillation tube for microwave oven according to claim 1, wherein the heat transfer preventing groove of the first grid holder is annularly formed along the flange portion. Heating means; A cathode disposed in the heat generating unit to emit electrons; A first grid disposed on the cathode to form an input cavity with the cathode and the blocking capacitor, the first grid focusing electrons emitted from the cathode according to the formed bias voltage; A second grid disposed on the first grid and through which electrons passing through the first grid pass; In the microwave oven tube disposed on the second grid, including an anode to form an output cavity with the second grid, A first grid holder having a seating portion on which the first grid is seated and a flange portion disposed on the blocking capacitor, wherein the flange portion is provided with a heat transfer preventing hole for preventing heat radiated from the heater from being discharged to the outside; Microwave oscillation tube for a microwave, characterized in that it comprises a. 4. The microwave oscillation tube according to claim 3, wherein the heat transfer preventing hole of the first grid holder is arranged in a circumferential direction along the flange portion. The microwave oven tube of claim 4, wherein the heat transfer preventing holes of the first grid holder are arranged in two rows in the circumferential direction along the flange portion. 6. The microwave oscillation tube for microwave oven according to claim 5, wherein the heat transfer preventing holes of the first grid holder arranged in two rows in the circumferential direction along the flange are alternately arranged.