KR100640794B1 - Connecting lead in magnetron - Google Patents

Abstract

The present invention relates to a magnetron, and more particularly, to a connection lead of a magnetron in which the defective rate is reduced during manufacturing.

According to the present invention, one side is connected to the center lead and the side lead, and the other side is welded with the choke coil of the input part, wherein the connection lead is formed to have an extension part extending a predetermined length further below the position of the choke coil. Provided is a connection lead of a magnetron.

In addition, when the diameter of the connection lead is 1.3 ~ 1.6mm, it has a length of 2.0 ~ 7.0mm, it is characterized in that it is formed of a material of iron-based carbon steel.

Therefore, according to the magnetron of the present invention, welding between the connection lead and the choke coil is impossible due to a poor welding without increasing the diameter of the connection lead, thereby preventing the disposal of the magnetron, thereby improving productivity.

Magnetron, Choke Coil, External Connection Lead, Welding, Bad

Description

Connecting lead in magnetron

1 is a cross-sectional view showing a schematic configuration of a conventional general magnetron.

FIG. 2 is a perspective view showing main parts of FIG. 1; FIG.

Figure 3 is a perspective view showing the coupling portion of the choke coil and the external connection lead of the connection lead of the magnetron of the present invention.

Figure 4 is a graph showing the relationship between the defective rate according to the length of the connection lead of the magnetron of the present invention.

* Explanation of Signs of Major Parts of Drawings

117a: center lead 117b: side lead

118: lower shield 119: bonded metal plate

121: ceramic stem 123a: choke coil

123b: External connection lead 123c: Extension part

The present invention relates to a magnetron, and more particularly, to a connection lead of a magnetron in which the defective rate is reduced during manufacturing.

In general, magnetrons are applied to microwave ovens, plasma lighting equipment, dryers and other high frequency systems. The magnetron is used as a heat source for heating the target by generating a microwave by the electromagnetic field of the hot electrons emitted to the cathode by applying power, and outputs the microwave through the antenna Peter.

The magnetron is roughly divided into a high frequency generator for generating high frequency energy by an electromagnetic field, an input unit for applying power to the high frequency generator, and an output unit for emitting high frequency energy from the high frequency generator.

1 is a block diagram illustrating a structure of a conventional magnetron. Referring to the magnetron, a yoke upper plate 1a and a yoke lower plate 1b are installed inside an outer case, and a high frequency output unit is provided on an upper portion of the yoke upper plate 1a. A high frequency generator is installed inside the upper and lower yoke plates (hereinafter, referred to as a "yoke plate"), and an input part is provided below the yoke lower plate 1b.

The input unit has a filter box 22 fixed to the lower portion of the yoke lower plate 1b, a capacitor 23 installed in the filter box to supply power, and a choke coil 23a connected to the capacitor to receive current. And an external connection lead 23b extending from the choke coil.

The generating unit is provided with a cylindrical anode 11 in the center of the yoke plate 1, an acyl 14a is installed at the upper end of the anode 11, and an F-silk at the lower end of the anode 11; 14b) is provided, and the upper magnet 12a and the lower magnet 12b are respectively installed outside the Asil 14a and the Fsil 14b. In addition, on the inner surfaces of the f-sil 14b and the ac-il 14a, a box electrode 13a and a retarder 13b are provided to be symmetrical with respect to the vane 15 up and down, and the f-sil 14b. At the lower end of the ceramic stem 21 is installed to seal the lower end of the F chamber 14b.

Here, the internal space surrounded by the ceramic stem 21, the anode 11, the acyl 14a and the fsil 14b is maintained in a vacuum.

The inner surface of the anode 11 is provided with a vane 15 radially to form a working space 15a in the center, a cathode 16 is installed in the working space 15a, the cathode ( The center lead 17a and the side lead 17b are installed in the 16 to support the cathode 16, and the center lead 17a and the side lead 17b are electrically connected to the external connection lead 23b. .

One end of the plurality of cooling fins 33 is installed on the outer surface of the anode 11, and the other end of the cooling fins 33 is installed on the yoke plate 1. An air cooling fan (not shown) is installed outside the yoke plate 1, and an inlet (not shown) and an outlet (not shown) are formed in the outer case so that outside air is sucked and discharged by the air cooling fan.

Accordingly, heat generated by the loss of the high frequency radiation that is not emitted in the anode 11 is transferred to the anode 11, and the heat of the anode 11 is transferred to the yoke plate through the cooling fin 33. Is passed on to (1). The heat transferred to the yoke plate is exchanged with the outside air by operating the air cooling fan.

In addition, a magnet spacer 17c is provided between the f seal 14b and the lower magnet 12b to shield heat from being transferred to the lower magnet 12b. do.

The high frequency output unit includes an antenna feeder 32 and an ceramic 31. The antenna feeder 32 has one end connected to the vane 15 and the other end connected to the antenna cap (not shown). It is installed so as to surround the ceramic 31 is installed between the upper end of the acyl 14a and the antenna cap. Accordingly, the microwaves transmitted through the antenna feeder 32 reach the target object through the ceramic 31.

2, an upper end shield (not shown) and a lower end shield 18 are installed at upper and lower ends of the cathode 16, and one end of the center lead 17a is provided at the lower end shield 18. ) And is fixed to the upper end shield through the center of the cathode 16, one end of the side lead (17b) is fixed to the lower end shield (18). The other ends of the center lead 17a and the side lead 17b are fixed to the ceramic stem 21.

That is, two insertion holes (not shown) and two fixing grooves (not shown) are respectively formed in the ceramic stem 21, and one end of the external connection lead 23b is inserted into each of the insertion holes, respectively. The other ends of the center lead 17a and the side lead 17b are fixed to the fixing grooves.

On the upper side of the ceramic stem 21, two joining metal plates 19 are provided in pairs, and each joining metal plate 19 is provided so as not to be connected to each other.

Thus, one center lead 17a and one external connection lead 23b are connected to one joining metal plate 19, and one side lead 17b and one external connection lead 23b are connected to another joining metal plate 19. Each is connected.

In addition, the external connection lead 23b is formed to extend to the position of the choke coil 23a under the ceramic stem 21, the lower end of which is welded to the end of the choke coil 23a.

On the other hand, the inside of the working space when the magnetron is operating at a high temperature is formed, the side lead 17b and the center lead 17a penetrates the working space 15a or is connected to the working space 15a. The side leads 17b and the center leads 17a are generally made of a material of molybdenum having excellent thermal characteristics.

However, since the molybdenum is a relatively expensive material in order to reduce the production cost, from the ceramic stem 21 to the choke coil 23a outside the working space 15a to the choke coil 23a, a material of low-cost iron-based carbon steel is not molybdenum. The external connection lead 23b having is used.

 The function of the magnetron having such a configuration will be described as follows.

The magnetron emits hot electrons from the cathode 16 connected thereto as a current is applied to the center lead 17a through an external connection lead 23b, and the emitted hot electrons are emitted from the inner surface of each vane 15 and the cathode. It is located in the working space (15a) formed between (16). In addition, the magnetic energy generated from the upper and lower magnets 12a and 12b is concentrated into the working space 15a through the upper and lower magnetic poles 13a and 13b.

Accordingly, in the working space 15a, microwaves having high frequency energy are generated as the hot electrons and the magnetic energy interact with each other.

The microwaves are moved through the antenna feeder 32 extending outward from the vanes 15 and then reached through the aceramic 31 located at the upper end of the acyl 14a.

Therefore, when the magnetron is used in a microwave oven, the microwave serves to cook or warm food, and when the magnetron is applied to a lighting device, the microwave can excite plasma to generate light.

At this time, the high-frequency energy that is not radiated to the outside of the anode 11 is lost as heat, while the cooling fin 33 and the air cooling fan are installed to dissipate the heat, while the unnecessary high-frequency components leak to the input unit. In order to prevent the filter box 22 to seal the input.

In addition, the filter box 22 is composed of a filter box upper portion 22a and a filter box cover 22b. Therefore, after welding the external connection lead 23b and the choke coil 23a in the filter box 22a, the filter box cover 22b is covered and shielded.

In addition, since the high voltage of 4 KV or more flows through the choke coil 23a inside the filter box 22, the part and the filter through which the high voltage is energized to prevent the high voltage from being energized by the electric flame through the filter box 22. A certain insulating distance must be maintained between the boxes 22.

In more detail, the portion where the high voltage is energized includes a coupling portion of the capacitor 23 and the choke coil 23a, a coupling portion of the external connection lead 23b and the choke coil 23a, an external connection lead 23b, and the like. This part must maintain a predetermined insulation distance from the filter box 22.

In addition, the ceramic stem 21 is provided between the F chamber 14b and the external connection lead 23b to insulate the external connection lead 23b and the F chamber 14b.

Therefore, the external connection lead 23b and the F chamber 14b are insulated by the ceramic stem 21, and the unnecessary high frequency leaked to the input part is reflected by the filter box 22 so as not to leak to the outside. Will not. In addition, the high voltage electricity that is supplied to the input unit is not energized because it is spaced apart from the filter box 22 by an insulating distance.

However, the connection lead of the conventional magnetron as described above has the following problems.

First, the choke coil and the external connection lead is joined by welding. Since the material of the external connection lead is iron-based carbon steel having high thermal conductivity, there is a problem that the wide part is heated and melts quickly when welding.

Second, when a failure occurs in welding in the first welding attempt, welding is attempted again until it is properly welded. If the external connection lead is excessively melted every time the welding attempt is made, the length of the external connection lead is excessively short. As a result, welding may not be possible with the choke coil, which leads to the disposal of the magnetron, which causes a problem that productivity is lowered.

Third, there is a way to increase the diameter of the connection lead in order to reduce the melting length when welding the external connection lead of the iron-based carbon steel material, but this requires excessive cost because the dimensions of the peripheral parts must be changed and the mold and the process is required There is a problem that can not be.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a connection lead of a magnetron that is low in production cost and prevented from being discarded due to poor welding.

In order to achieve the above object, in the present invention, one side is connected to the center lead and the side lead, the other side is welded with the choke coil of the input portion, the connection lead is predetermined below the position of the choke coil Provided is a connection lead of a magnetron, characterized in that it is formed to have an extension extending further in length.

In addition, when the diameter of the connection lead is 1.3 ~ 1.6mm, it has a length of 2.0 ~ 7.0mm, it is characterized in that it is formed of a material of iron-based carbon steel.

Therefore, according to the magnetron of the present invention, welding between the connection lead and the choke coil is impossible due to a poor welding without increasing the diameter of the connection lead, thereby preventing the disposal of the magnetron, thereby improving productivity.

Hereinafter, with reference to the accompanying drawings, a preferred embodiment of the connection lead of the magnetron of the present invention that can specifically realize the above object.

In addition, the same components as in the prior art are given the same names and the same reference numerals for convenience of description, and description thereof will be omitted.

3 to 4 are views showing a preferred embodiment of the connection lead of the magnetron of the present invention.

First, as shown in FIG. 3, one end of the center lead 117a is introduced into the working space 15a (see FIG. 1) through the lower end shield 118, and one end of the side lead 117b is provided. It is fixed to the lower shield 118.

The other ends of the center lead 117a and the side lead 117b are fixed to the ceramic stem 121.

Meanwhile, the center lead 117a and the side lead 117b should be electrically connected to the choke coil 123a of the input unit. The center lead 117a and the side lead 117b are generally made of expensive molybdenum material. Since the center lead 117a and the side lead 117b are not directly bonded to the ends of the choke coil 123a for cost reduction, the center lead 117a extends only to the ceramic stem 121, and from the ceramic stem 121 is relatively. Electrical connection with the choke coil 123a is made through an external connection lead 123b formed of an inexpensive material.

To this end, the ceramic stem 121 has two insertion holes (not shown) for penetrating the external connection lead 123b, and two fixing grooves for fixing the center lead 117a and the side lead 117b. (Not shown) is installed on the upper surface of the ceramic stem 121, the side lead 117b, the center lead 117a and the external connection lead 123b bonded to the choke coil 123a are simultaneously fixed and electrically The joining metal plate 119 which connects is provided.

In addition, the joining metal plate 119 is installed in pairs so that the two are not connected to each other.

Accordingly, one center lead 117a and one external connection lead 123b are connected to one bonded metal plate 119, and one side lead 117b and one external connection lead 123b are connected to the other bonded metal plate 119. Each is connected.

The external connection lead 123b extends downward to be joined to the choke coil 123a of the input unit.

At this time, it is preferable that the external connection lead 123b and the choke coil 123a are joined by electric resistance welding.

Here, since the choke coil 123a is generally made of copper, the external connection lead 123b has good electrical resistance weldability with the choke coil 123a of the copper material, and the material cost is low and the electrical characteristics are excellent. It is preferably made of iron (Fe) -based carbon steel.

On the other hand, the material of the connection lead of the magnetron of the present invention is not limited to the iron-based carbon steel as described above, other materials such as stainless series can also be used.

In addition, the external connection lead 123b is preferably formed to have an extension portion 123c extending a predetermined length further below the position of the choke coil 123a.

In this case, when the choke coil 123a and the external connection lead 123b are welded, the extension part 123c has a margin in consideration of the length that melts and decreases during welding.

That is, the external connection lead 123b and the choke coil 123a are joined by welding, and the external connection lead 123b is melted every time it is welded to the choke coil 123a, so that its length is shortened. By forming the external connection lead 123b longer than the choke coil 123a by the length of the extension part 123c, even if the external connection lead 123b melts several times by welding, the choke coil ( 123a) is not too short to the extent that welding is impossible.

On the other hand, the diameter of the extension portion 123c is preferably between 1.3mm and 1.6mm, the same as the conventional external connection lead 23b.

This is to avoid the cost because the dimensions of the parts related to the external connection lead 123b and the mold and process for processing the external connection lead 123b should be changed.

In addition, when the diameter of the extension portion 123c is 1.3mm ~ 1.6mm, the length (Lw) of the extension portion is preferably 2.0mm ~ 7.0mm.

4 is a graph showing a change in the defective rate of the magnetron according to the length (Lw) of the extension when the diameter of the external connection lead 123b is 1.3mm ~ 1.6mm.

As shown in the graph, the change in the defective rate is insignificant between the length Lw of 0 to 2.0 mm, and the change in the defective rate drops sharply in the 2.0 mm to 7.0 mm section.

In addition, the tendency that the defective rate decreases is small in a section in which the length Lw of the extension is larger than 7.0 mm.

Therefore, when the length Lw of the extension is 2.0 mm or less, the decrease rate of the failure rate is not large, and when 7.0 mm or more, the decrease rate of the failure rate is insignificant compared to the added length. Therefore, the length Lw of the extension part is considered to be economical. It is preferable that it is between 2.0 mm and 7.0 mm.

Therefore, according to the connection lead of the magnetron according to the present invention, when welding the external connection lead 123b and the choke coil 123a of the input part, a welding failure occurs and the welding part is rewelded several times, but the extension part 123c is used. Due to this, there is room for a shorter length of melting during welding, and thus the length of the external connection lead 123b is prevented from being excessively shorted such that welding with the choke coil 123a is impossible, thereby lowering the defective rate of the magnetron, thereby reducing productivity. There is an effect to be improved.

The effects of the connection lead of the magnetron according to the present invention described above are as follows.

First, even if the welding defect occurs when welding the choke coil of the external connection lead and the input unit, even if re-welded several times, the length of the external connection lead is increased because there is room for the shortening length that melts during welding due to the extension portion By preventing excessive shortening of the choke coil and welding, the defect rate of the magnetron is lowered, thereby improving productivity.

Second, since the iron-based carbon steel can be used as the material of the external connection lead, the electrical properties are excellent, thereby improving the performance of the magnetron.

Third, since the diameter of the extension can be maintained as in the prior art, there is no need to change the design, so that the cost of design change can be reduced, thereby improving productivity.

Claims (5)

In the connecting lead one side is connected to the center lead and the side lead, the other side is welded with the choke coil of the input unit, The connecting lead of the magnetron, characterized in that formed to have an extended portion extending a predetermined length further below the position of the choke coil. The method of claim 1, An extension part of the connection lead is connected to the magnetron, characterized in that the diameter of 1.3 ~ 1.6mm. The method of claim 1, The extension portion of the connection lead has a length of 2.0 ~ 7.0mm of the magnetron connection lead, characterized in that. The method of claim 1, The connecting lead of the magnetron, characterized in that formed of a material of the carbon steel of iron (Fe). The method of claim 1, The connection lead of the magnetron, characterized in that formed of a stainless series material.

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