KR100262273B1 - Alignment grid for use in a micro-generator of a microwave oven - Google Patents

Abstract

PURPOSE: An assembling direction alignment grid of a ultra high frequency oscillator tube for microwave range is provided to align easily an assembling direction when assembling a grid for anode and a grid for cathode. CONSTITUTION: An assembling direction alignment grid(400) of a ultra high frequency oscillator tube for microwave range is composed of a circular disc shape corresponding to a cathode. The first and the second grids have the same shapes. A rectangular slot or a circular slot is formed each inner portion of the first and the second grids. The assembling direction alignment grid(400) is formed with a plurality of angle portion(410) and an assembling direction alignment angle portion(420).

Description

Assembly Alignment Grid of Microwave Oscillating Tube for Microwave Oven

The present invention relates to a grid of microwave oven tubes, and more particularly, to an assembly direction alignment grid having a structure that can be easily aligned during assembly.

The applicant's Korean Patent Application Nos. 97-36327 and 97-36328 disclose ultra-high frequency oscillating tubes for microwave ovens that are simple in structure and can eliminate the risk of high voltage and achieve light weight. As shown in FIG. 1, the ultra-high frequency oscillation tube is provided with a power input unit 110, a heater 120, an input cavity 130, and an output cavity in a filter box 105 having a cover 104 covered therein. 140 and the feedback rod 160 are provided, and the antenna 150 in the anode 146 is provided in the bracket 102. The installation space of the antenna 150 in the filter box 105 and the anode 146 maintains a vacuum.

The cathode 132, which is an electron radiator, emits hot electrons by the indirect heating method by the heat of the heater 120, and the cathode 132 placed on the upper surface of the heater 120 is about 1000− by the heat of the heater 120. When heated to about 1300 ℃ emits hot electrons.

The input cavity 130 is a space surrounded by the cathode 132, the first grid 134, and the choke structure 136, and the cathode 132 is a ring-shaped disk having a hole formed in the center thereof. The first grid 134 arranged at a predetermined interval on the upper side of the N th) is applied with a bias voltage to control and focus electrons emitted from the cathode 132 to the input cavity 130. At this time, the first grid 134 and the cathode 132 is electrically insulated, that is, the direct current must be shielded, the surface current forming the microwave inside the input cavity 130 must be energized, for this purpose choke structure 136 is arranged between the cathode 132 and the first grid 134.

The output cavity 140 arranged on the top of the input cavity 130 is installed to face the top of the first grid 134 of the input cavity 130 so that electrons passing through the first grid 134 pass through the surface current. Is enclosed by a second grid 142 and an anode 146 having protrusions 144 protruding downward from the bottom surface. In this space, electrons focused on the input cavity 130 are densely modulated. Accelerated by the potential difference between the grid 134 and the second grid 142, the microwave is formed by the surface current induced in the second grid 142. The anode 146 that dissipates the slowed-down electron beam is also stacked with a plurality of cooling fins 148 to radiate heat.

The electrons focused on the input cavity 130 are densely modulated by the automatic shielding function of the bias power of the first grid 132 to pass through the first grid 132, 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 132 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. The antenna ceramic 154 and the antenna cap 156 connected to the upper portion of the antenna 150 have the same structure as a conventional marknetron.

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 addition, as shown in FIG. 2, the first and second grids 134 and 142 have the same shape as that of the cathode 132 as a metal material, and have a plurality of circular holes or holes therein to allow electrons to pass therethrough. A rectangular slot 170 is formed, and a predetermined gap is maintained by the ceramic pin 172 provided between the choke structure 136 and the output cavity 140.

However, the first and second grids 134 and 142 of the conventional microwave microwave oscillation tube are identical to each other, but there is no indication of a predetermined division or symmetry. There was a problem that it was almost difficult to align the round hole or the square slot of the pinch with great care. Therefore, when the first grid for the cathode and the second grid for the anode are not aligned with each other and interfere with the flow of electrons, as shown in FIG. 3, the first grid 134 is released from the cathode 132. The passing electron beam hits the second grid 142 to be extinguished and generates heat, resulting in a high frequency output efficiency.

Accordingly, the present invention is to provide an assembly direction alignment grid that can easily align the assembly direction when assembling the cathode grid and the anode grid of a conventional microwave microwave tube.

As a means for achieving the above object, the present invention is an assembly direction alignment grid of a microwave oven tube for microwave oven, wherein the first and second grid is a plurality of corners formed at predetermined equal intervals around the circumference, and the corners Assembly direction alignment angles are set differently from each of the, wherein the assembly direction alignment angles are deflected to either one by an angle different from the angle to be maintained between the plurality of angles, or less than the thickness of each of the plurality of angles It is done.

According to the present invention, by forming the assembling direction alignment parts in the circumference of the first and second grids differently from the other plurality of parts, each of the grid for the cathode and the grid for the anode, compared to the conventional grid without special indication By simply aligning the assembly direction without additional labor, the flow of electrons is improved to increase the high frequency output efficiency.

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

FIG. 2 is a perspective view illustrating the first and second grids of FIG. 1, respectively.

3 is a schematic diagram illustrating a flow state of electrons when the first and second grids of FIG. 1 are not aligned with each other,

4 is a schematic plan view showing an assembly direction alignment grid according to an embodiment of the present invention;

5 is a schematic plan view showing an assembly direction alignment grid according to another embodiment of the present invention.

<Description of the code | symbol about the principal part of drawing>

100: high frequency oscillation tube 102: bracket

104: filter box cover 110: power input unit

120: heater 130: input cavity

132: cathode 134: first grid

136: choke structure 140: output cavity

142: second grid 144: projection

146: anode 148: cooling fin

150 antenna 152 coupling end

154: antenna ceramic 156: antenna cap

160: feedback rod 170: round hole or square shape slot

172: ceramic pin 300: assembly direction alignment grid

310,410: Parts 320,420: Assembly direction

Hereinafter, with reference to the accompanying drawings will be described in detail the assembly direction alignment grid of the microwave oven for microwave oven according to an embodiment of the present invention.

Assembly direction alignment grid 300 of the microwave oscillation tube for microwave oven of the present invention is a circular disk shape corresponding to the cathode 132, as can be seen from Figures 3 and 4, the first and second grid In the same shape, a rectangular slot (not shown) or a circular hole 170 is formed therein.

In the assembly direction alignment grid 300 according to the present invention, a plurality of corner portions 310 and an assembly direction alignment angle portion 320 set differently from the corner portion 310 are formed around the circumference.

In an embodiment of the present invention, as shown in FIG. 4, three corner portions 310 are formed at intervals of 90 °, and one assembly direction alignment corner portion 320 is deflected by an angle of θ to the left. It is.

In contrast, in another embodiment of the present invention, as shown in FIG. 5, three corner portions 410 are formed at intervals of 90 °, and one assembly direction alignment corner portion 420 includes a plurality of corner portions ( The thickness is smaller than the thickness of each of the 410. On the contrary, it can be formed to a large thickness.

As described above, since the assembly direction alignment grid of the present invention is the same for the cathode or the anode, each of the plurality of legs formed in the circumference of the assembly direction alignment portion 310 or 410 so that only electrons can pass through each other. The circular hole or the square slot formed inside is exactly aligned.

In the above, the corners of the grid according to the present invention are circular, and the assembly direction alignment angles are described as being shifted to one side or the thickness is differentiated. However, the present invention is not limited thereto, for example, a grid holder supporting the grid. The grid is integrated with the grid holder, but also having the assembly direction alignment means in the grid holder is the same as the present invention, of course.

According to the present invention, as compared with the grid of the microwave oven for microwave ovens, a plurality of corners and an assembly direction alignment corner are formed on the circumference, so that the cathode grid and the anode grid are assembled. Since the circular holes or the square slots through which electrons can be easily aligned, the flow of electrons can be smoothed, so that the high frequency output efficiency is improved, thereby increasing the performance and reliability of the product.

Claims (3)

A power input unit, heat generating means for generating heat by receiving power from the power input unit, cathodes sequentially installed on the heat generating means at predetermined intervals, a first grid, and a choke structure provided between the cathode and the first grid; The cathode is heated to a predetermined operating temperature by the heat of the heat generating means to emit hot electrons, and the first grid is formed with a plurality of circular holes or square slots, and a bias voltage is applied. An input cavity to control and focus electrons emitted from the cathode, the choke structure conducts a surface current that forms a microwave inside the input cavity, and shields a direct current between the cathode and the first grid; A plurality of cooling fins are stacked to radiate the light, the anode for extinguishing the decelerated electron beam And electrons focused in the input cavity as a space surrounded by a second grid installed on the first grid in the same shape as the first grid to induce surface current while electrons passing through the first grid of the input cavity pass. Is an output cavity that is accelerated by the potential difference between the first grid and the second grid while being densely modulated, and emits microwaves formed by the surface current induced in the second grid, and the microwaves formed in the output cavity. And a grid of microwave oscillation tubes for microwave ovens, comprising a feedback means provided between the input and output cavities to feed back part of the microwaves formed in the output cavity to the input cavity. The first and second grids and the plurality of corner portions formed at predetermined equal intervals around the circumference, Assembly direction alignment grid of microwave microwave oscillation tube for microwave oven characterized in that the assembly consisting of the respective parts of the assembly direction is set differently. The assembly direction alignment grid of the microwave microwave oscillation tube of claim 1, wherein the assembly direction alignment angles are deflected to either side by an angle different from an angle held between the plurality of angle portions. The assembly direction alignment grid of the microwave microwave oscillation tube of claim 1, wherein the assembly direction alignment sections are smaller than the thicknesses of the plurality of sections.

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