KR19990056493A - 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 heating means 120; A cathode 232 disposed on the heat generating means 120 to emit electrons; A first cavity disposed on the cathode 232 to form an input cavity 130 together with the cathode 232 and the blocking capacitor 136, and focusing electrons emitted from the cathode 232 according to the formed bias voltage; A grid 134; A second grid 142 disposed on the first grid 134 and through which electrons passing through the first grid 134 pass; In the microwave oscillating tube for microwave oven disposed on the second grid 142, comprising an anode 146 with the second grid 142 to form an output cavity 140, the output from the input cavity In order to prevent diffusion of the electron beam moving to the cavity, a magnet disposed between the first grid and the second grid, a magnetic flux formed by the magnet, and a passage through which the electron beam passes.

According to the present invention, by disposing a magnet for preventing the diffusion of the electron beam between the first grid and the second grid, the distance between the first grid and the second grid can be widened, so that the work of disposing them is easy, As a result, product productivity is improved.

Description

Microwave Oscillation Tube for Microwave Oven

The present invention relates to an microwave oscillation tube for microwave oven, and more particularly, to an microwave oscillation tube for microwave oven, which can improve workability and productivity by widening a gap between a first grid and a second grid.

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. .

In such an ultra-high frequency oscillation tube, as shown in FIG. 2, electrons are diffused by the repulsive force of each other while the electron beam passes from the input cavity 130 to the output cavity 140 through the first grid 134. . In order to increase the power of the microwave, electrons must enter the output cavity 140 before being diffused. For this purpose, the second grid 142 is positioned adjacent to the first grid 134. At this time, a fine gap is maintained between the first grid 134 and the second grid 142.

However, as described above, the operation of keeping the first and second grids at a fine interval requires high precision, which makes the operation difficult and lowers productivity.

Therefore, the present invention has been devised according to the present invention, microwave microwave oscillation tube for improving the workability and productivity by placing a magnet therebetween so as to prevent diffusion of the electron beam even if the distance between the first grid and the second grid is widened To provide.

As a means for achieving the above object, the microwave oven for microwave oven of the present invention, the heating means; A cathode disposed in the heat generating unit to emit electrons; A first grid disposed over said cathode to form an input cavity with said cathode and blocking capacitor, and for focusing electrons emitted from said cathode in accordance with a formed bias voltage; A second grid disposed on the first grid and through which electrons passing through the first grid pass; In the microwave oscillation tube for microwave oven disposed on the second grid, including an anode forming an output cavity with the second grid, in order to prevent the diffusion of the electron beam from the input cavity to the output cavity, And a magnet disposed between the first grid and the second grid, and a passage through which the magnetic flux formed by the magnet and the electron beam pass.

According to the present invention, by disposing a magnet for preventing the diffusion of the electron beam between the first grid and the second grid, the distance between the first grid and the second grid can be widened, so that the work of disposing them is easy, As a result, product productivity is improved.

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 an arrangement of a conventional first grid and a second grid,

3 is a partial cross-sectional view showing a first and a second grid and a magnet disposed therebetween in accordance with a 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 holders 182, 184: first and second grid holder

232: cathode 232a: bend

232b: downward protrusion 301: magnet

305: Holder Pin

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 a characteristic element of the present invention is shown in FIG. 3, reference is made to FIG. 1 to describe the microwave microwave tube of the present invention.

The microwave microwave tube of the present invention includes a heater 120 as a heat generating means, a cathode 232 disposed on the heater 120 to emit electrons, and a cathode 232 and a blocking capacitor disposed on the cathode 232. An input cavity 130 formed together with 136, and arranged on the first grid 134 and over the first grid 134 to focus electrons emitted from the cathode 232 according to the formed bias voltage. A second grid 142 through which electrons passing through the first grid 134 pass, and an anode 146 disposed on the second grid 142 to form an output cavity 140 together with the second grid 142. It includes. Such structures and operations are described in detail in the currently pending Korean Patent Application No. 97-36327, which is incorporated herein by reference.

The microwave oscillation tube of the present invention, as shown in FIG. 3, includes a magnet 301 disposed between the first grid 134 and the second grid 142. Here, the first grid 134 and the second grid 142 maintain a relatively wide spacing, for example, several Cm compared to the conventional fine spacing.

The magnet 301 is supported by a holder pin 305 having the same shape as the first and second grids 134 and 142 and joining the first and second grid holders 182 and 184. The magnet 301 has a passage 304 through which an electron beam moves from the input cavity 130 to the output cavity 140 at positions corresponding to the electron beam passing holes of the first and second grids 134 and 142. do. Accordingly, the electron beam passing through the first grid 134 is not diffused by the magnetic flux of the magnet 301, and moves along the passage 304 of the magnet 301 and passes through the second grid 142 into the output cavity 140. Is entered.

As described above, the microwave microwave tube of the present invention can widen the distance between the first grid and the second grid by disposing a magnet for preventing diffusion of the electron beam between the first grid and the second grid. The work of arranging them is easy, and as a result, the productivity of the product is improved.

Claims (2)

Heating means; A cathode disposed in the heat generating unit to emit electrons; A first grid disposed over said cathode to form an input cavity with said cathode and blocking capacitor, and for focusing electrons emitted from said cathode in accordance with a formed bias voltage; A second grid disposed on the first grid and through which electrons passing through the first grid pass; In the microwave oscillating tube for microwave oven comprising an anode disposed on the second grid, to form an output cavity with the second grid, A magnet disposed between the first grid and the second grid, a magnetic flux formed by the magnet, and a passage through which the electron beam passes to prevent diffusion of an electron beam moving from the input cavity to the output cavity Microwave oscillation tube for microwave, characterized in that. The microwave oven tube of claim 1, wherein the magnet is supported by a holder pin interposed between the first and second grid holders.