KR19990056500A - Cooling Fin Assembly Method of Microwave Oscillating Tube for Microwave Oven - Google Patents

Abstract

The present invention relates to a method for installing a plurality of cooling fins 148 on the outer periphery of the anode 146 to radiate heat of the anode 146 decelerating the electron beam in the microwave microwave tube. Heating the 148 to increase the inner diameter of the cooling fin 148; inserting the cooling fin 148 having the increased inner diameter into the outer circumference of the anode 146; and inserting the inserted cooling fin 148 into the outer periphery of the anode 146. Cooling is characterized in that consisting of a step of fixing to the outer periphery of the anode (146). At this time, the step of increasing the inner diameter of the cooling fin 148 is heated using a common heater, when the inserted cooling fin 148 is cooled is preferably cooled at room temperature.

When the cooling fins are assembled to the anode using the method of assembling the cooling fins of the microwave microwave oscillation tube of the present invention, the loads and deformations that the anode can receive during assembly are reduced, and the cooling fins may be generated during the use of the microwave oscillation tube. By preventing defects such as separation between the anodes, there is an effect of maintaining a good cooling performance of the ultra-high frequency oscillation tube.

Description

Cooling Fin Assembly Method of Microwave Oscillating Tube for Microwave Oven

The present invention relates to a method for assembling a cooling fin of an microwave oven for microwave oven, and more particularly, to reduce the load and deformation amount that an anode can receive while assembling the cooling fin to an anode by using an assembly method using thermal expansion. The present invention relates to a method for assembling a cooling fin of an microwave oven for microwave oven.

The applicant's Korean Patent Application Nos. 97-36327 and 97-36328 disclose microwave microwave oscillating tubes for simple structure, which 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 in 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 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. 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 feedback rod 160 for feeding back part of the microwaves formed in the output cavity 140 to the input cavity 130 is installed at the center between the input / output cavities 130 and 140 to amplify and resonate the power of the microwave. .

The first and second grids 134 and 142 are made of metal and have the same shape as the cathode 132, and have a plurality of circular holes or square slots formed therein to allow electrons to pass therethrough. , Between the choke structure 136 and the output cavity 140, as supported by the grid holder 180 as shown in FIG. 2, respectively, and a predetermined distance is maintained by the ceramic pins 172.

As shown in FIG. 2, a conventional cooling fin assembly method of a microwave microwave oscillation tube forcibly presses the cooling fins 148 into the anode 146 with a load of about 1 ton by using a cooling fin press-fit head 200. Was.

However, the anode 146 is subjected to a frictional load during the assembling process due to the forced indentation due to negative tolerance, and in the case of eccentricity, the load and deformation amount of the entire anode 146 are considerably large. The anode 146 and the cooling fins 148 coupled through the interference indentation are deformed and separated from each other during thermal expansion and contraction during operation of the microwave microwave oscillation tube, thereby decreasing the cooling efficiency of the anode 146.

Accordingly, the present invention has been devised according to the present invention, the cooling fins of microwave microwave tubes for reducing the load and deformation amount that the anode can receive while assembling the cooling fins on the anode using an assembly method using thermal expansion. It is to provide an assembly method.

In order to achieve the above object, the present invention relates to a method for installing a plurality of cooling fins on the outer periphery of an anode to radiate heat of an anode decelerating an electron beam in a microwave microwave tube for microwaves. And extending the inner diameter of the cooling fin, inserting the cooling fin having the increased inner diameter into the outer circumference of the anode, and cooling the inserted cooling fin to fix the outer circumference of the anode.

According to a preferred embodiment of the present invention, the step of increasing the inner diameter of the cooling fin is heated using a common heater, it is preferred that the cooling fin is cooled at room temperature when the inserted cooling fin is cooled.

When the cooling fins are assembled to the anode using the method of assembling the cooling fins of the microwave microwave oscillation tube of the present invention, the loads and deformations that the anode can receive during assembly are reduced, and the cooling fins may be generated during the use of the microwave oscillation tube. By preventing defects such as separation between the anodes, there is an effect of maintaining a good cooling performance of the ultra-high frequency oscillation tube.

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

Figure 2 is a cross-sectional view showing a conventional assembly method for assembling the cooling fins to the anode of Figure 1,

3 is a cross-sectional view showing a method for assembling a cooling fin according to a preferred embodiment of the present invention.

4 is a cross-sectional view showing an anode in which cooling fins are installed by using a cooling fin assembly method of an microwave oven for microwave oven according to a preferred embodiment of the present invention.

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

120: heater 132: cathode

134: first grid 136: choke structure

142: second grid 146: anode

148 cooling pin 150 antenna

152: coupling end 154: antenna ceramic

172: ceramic pin 182: insertion hole

200: cooling fin press-fit head

Hereinafter, with reference to the accompanying drawings will be described in detail a cooling fin assembly method of the microwave oven tube for microwave oven according to an embodiment of the present invention. For convenience of explanation, the same reference numerals are given to the same configuration as in the prior art.

In the method of assembling the cooling fins of the microwave microwave tube for microwave oven according to the present invention, the cooling fins 148 are heated by an appropriate method to expand the inner diameter of the cooling fins 148 so as to be larger than the outer diameter of the anode 146 and then the anode 146. It is inserted into a suitable position on the outer circumference, and cooled to room temperature so that the cooling fin 148 contracted to the size before being heated is tightly fitted to the anode 146.

As shown in FIG. 4, the required number of cooling fins 148 may be sequentially assembled to the anode 146 using the assembly method described above.

By assembling the cooling fins of the ultra-high frequency oscillating tube using the cooling fin assembling method of the present invention, it is possible to reduce the load and deformation amount that the anode can receive while assembling the cooling fins on the anode.

When the cooling fins are assembled to the anode using the method of assembling the cooling fins of the microwave microwave oscillation tube of the present invention, the loads and deformations that the anode can receive during assembly are reduced, and the cooling fins may be generated during the use of the microwave oscillation tube. By preventing defects such as separation between the anodes, there is an effect of maintaining a good cooling performance of the ultra-high frequency oscillation tube.

Claims (3)

In a microwave microwave oscillation tube, in which a plurality of cooling fins are provided on the outer periphery of the anode to radiate the heat of the anode which slows down the electron beam, Increasing the inner diameter of the cooling fins by heating the cooling fins; Inserting the cooling fin having an increased inner diameter into an outer circumference of the anode; Cooling fin assembly method of the microwave oven for microwave oven characterized in that it comprises a step of cooling the inserted cooling fins to the outer periphery of the anode. The method of claim 1, wherein the increasing the inner diameter of the cooling fins comprises heating using a common heater. The method of assembling the cooling fins of the microwave oven tube of claim 1, wherein the inserted cooling fins are cooled at room temperature.