KR200226754Y1 - A jointing structure of microwave oscillator for microwave oven - Google Patents

Abstract

The present invention relates to a fastening structure of a microwave microwave oscillation tube for an microwave, and an object of the present invention is to prevent the ceramic fastening structure of the input cavity and the output cavity from being damaged by thermal deformation and to provide easy assembly.

To this end, the fastening structure of the present invention is fastened to one side of the molybdenum bolt, a ceramic insulator inserted into the molybdenum bolt, the molybdenum nut, the molybdenum bolt is composed of one side fixed to the bolt fastening groove of the anode outer lower portion and the other side fastened to the molybdenum nut It is characterized by consisting of a bolt fastening groove formed in the outer lower portion.

According to the fastening structure of the present invention, the fastening structure is not damaged by thermal deformation, there is no need for an alignment guide for assembly, there is an effect that the assembly is easy.

Description

Joint structure of microwave oscillator for microwave oven {A jointing structure of microwave oscillator for microwave oven}

The present invention relates to a fastening structure for coupling the input and output cavity of the microwave oven tube for microwave, in detail, the ceramic bolt and nut is formed of molybdenum material and the bolt is fixed to the fastening groove formed on the outer lower portion of the anode A fastening structure for improving the assembly of the input cavity and the output cavity.

In a conventional microwave microwave tube, as shown in FIG. 1, a ring-shaped cathode 106 functioning as an electron radiator is disposed above the heater 107, and the cathode is indirectly heated by heat generation of the heater. When the 106 is heated to about 600 to 1200 ° C., hot electrons are emitted, and the released hot electrons are applied to the input cavity 105 as a bias voltage is applied to the first grid 101 arranged at a predetermined interval on the cathode. Focused

The electrons focused on the input cavity 105 are density modulated by the automatic shielding function of the bias power supply of the first grid 101 to pass through the first grid 101 and at this time insulate the input and output cavities 105, ( When an operating voltage is applied between 103, a potential difference is generated therebetween, and electrons passing through the first grid 101 are accelerated to pass through the second grid 102, thereby inducing a surface current in the output cavity 103. do. As a result, microwaves are formed in the output cavity 103, and the formed microwaves penetrate through the center of the anode 109 and are radiated through the antenna 110 formed in the output cavity 103. For this purpose the coupling end 108 of the antenna is located in the output cavity 103. Meanwhile, a feedback rod 111 that feeds back a portion of the microwaves formed in the output cavity to the input cavity 105 is installed at the center between the input and output cavities 105 and 103 to amplify and resonate the power of the microwave.

As shown in FIG. 2, which shows a conventional oscillation tube structure in which the portion A of FIG. 1 is enlarged, the input cavity 105 includes a first grid holder 204 and a cathode housing for supporting the first grid 101 and the first grid. 201 and a space surrounded by the cathode flange 202 and the blocking capacitor 104, the output cavity 103 is a space consisting of the second grid holder 206, the second grid 102, the lower surface of the anode It is composed. In addition, the input cavity 105 is designed to resonate near the oscillation frequency, and when resonating, the voltage applied to the input cavity 105 and the output cavity 103 is insulated from each other, and the ultra-high frequency current is the first grid holder 204. ) And the inner surface of the cathode flange 202 and the cathode housing 201.

The cathode flange 202 is press-fitted near the middle of the cathode housing 201 and welded, and the first grid holder 204 and the second grid holder 206 disposed on the top of the blocking capacitor 104 are spacers 205. Spacing is maintained. In this state, the ceramic bolt 203 is formed from the top with the second grid holder 206, the spacer 205, the first grid holder 204, the blocking capacitor 104 and the cathode flange 202 as shown in FIG. 2. )

The material of the bolt 203 and the nut 207 is generally used to reduce the thermal expansion caused by the heat generation of the heater, and to enable the output cavity 103 and the input cavity 105 to be insulated from each other.

However, the conventional ceramic bolt 203 is fragile and broken by thermal expansion, and the combination of the first and second grid holders 204 and 206, the spacer 205, the blocking capacitor 104 and the cathode flange 202 In the process, a separate cavity alignment structure is required, and processing is difficult.

Therefore, the present invention has been devised accordingly, and an object thereof is to provide a fastening structure of a microwave oven tube for microwave oven which can be easily coupled to the input cavity and the output cavity.

In order to achieve this purpose, the ceramic bolt 203 is made of molybdenum material and fixed to the anode outer lower portion 210, and when the molybdenum nut is tightened to mutually insulate the input cavity 105 and the output cavity 103, An insulator is inserted.

1 is a cross-sectional view showing the structure of a microwave oven for microwave ovens that are commonly used.

Figure 2 is an enlarged view of a portion of a microwave oven for microwave oven coupled with a conventional ceramic bolt fastening.

3 is a partially enlarged view of the oscillation tube for a microwave oven according to a preferred embodiment of the present invention.

(Explanation of symbols for the main parts of the drawing)

101: first grid 102: second grid

103: output cavity 104: blocking capacitor

105: input cavity 106: cathode

107: heater 108: coupling end

109: anode 110: antenna

111: feedback rod 201: cathode housing

202: cathode flange 203, 207: ceramic bolts, nuts

204: first grid holder 205: spacer

206: second grid holder 210: anode outer bottom

210a: bolt fastening 310: molybdenum nut

320: ceramic insulator 330: molybdenum bolt

Referring to the accompanying drawings, a fastening structure for coupling an input cavity and an output cavity of a microwave oven tube according to a preferred embodiment of the present invention will be described.

3 is a partial cross-sectional view of the oscillation tube for a microwave oven equipped with a fastening structure according to an embodiment of the present invention, the present invention is one side and molybdenum nut 310 is fastened to the bolt fastening groove 210a of the anode outer lower portion 210. Molybdenum bolt 330 formed of molybdenum, molybdenum bolt 330 is fastened to one side of the molybdenum bolt 330 and is inserted into the anode outer lower portion 210, the molybdenum bolt 330 is formed with a bolt fastening groove 210a The ceramic insulator 320 is fixed to the molybdenum nut 310, and the molybdenum nut 310 is fastened to one side of the molybdenum bolt 330.

As shown in FIG. 3, the ceramic insulator 320 has a cylindrical shape and one side of the ceramic insulator 320 is provided to extend outwardly, and an inner surface of the first grid holder 204, the blocking capacitor 104, and the cathode flange 202 is provided. And an outer surface of the molybdenum bolt 206. In addition, the second grid holder 206, the spacer 205, the first grid holder 204, the blocking capacitor 104, and the molybdenum bolt 330 accommodated in the bolt fastening groove 210a of the anode outer lower portion 210. The cathode flanges 202 are stacked one after the other. The ceramic insulator 320 is then inserted and fastened by the molybdenum nut 310.

The combined structure using the molybdenum bolt and nut as described above is easy to process, does not break due to thermal deformation when the cathode is heated to a high temperature, there is no change in the shape of the input cavity because it can be tightened stronger than the ceramic material, Molybdenum bolts have a guide for aligning the cavity, eliminating the need for separate input and output cavity alignment, making it easy to assemble.

Claims (1)

One side is fixed to the anode, and in the fastening structure of the microwave oven for microwave oven to fasten the first grid holder, the cathode flange, the blocking capacitor, the spacer, the second grid holder which are sequentially stacked, A bolt made of molybdenum including an anode formed at an outer side of the anode with a bolt fastening groove, one side fixed to the bolt fastening groove and the other side coupled to the molybdenum nut, a nut made of molybdenum bonded to the molybdenum bolt, and outward Fastening structure of a microwave oven tube for microwave oven, characterized in that the extending flange formed of a cylindrical insulator formed on one side.