KR100260991B1 - Magnetron stem assembly having straight-type top lead - Google Patents

Abstract

PURPOSE: A stem assembly for magnetron with a top lead of a linear shape is provided to maintain an interval between a top lead and an end lead by adhering two flange metals of concentric circular shape on an upper face of a stem ceramic. CONSTITUTION: A top lead(2) of a linear shape is combined with an end lead(3) by penetrating the top lead(2) of the linear shape into a center groove(4) of the end lead(3). Two flange metals(8) of concentric circular shape are adhered on an upper face of a stem ceramic(6) to lengthen a distance between the top lead(2) and the end leads(3). The flange metals(8) are connected electrically with a terminal(9) located at a lower direction of the stem ceramic in order to maintain airtightness.

Description

Stem Assemblies for Magnetrons with Straight Top Leads

1 is a partial cutaway perspective view schematically showing a conventional magnetron.

2 is a perspective view showing in more detail the conventional stem assembly.

3 is an exploded perspective view of a conventional stem assembly.

4 is a perspective view showing a stem assembly having a straight top lid according to the present invention.

5 is a cross-sectional view of a stem assembly having a straight top lid according to the present invention.

6 is a plan view of a stem ceramic in the stem assembly of the present invention.

7 is a bottom view of the stem ceramic in the stem assembly of the present invention.

* Explanation of symbols for main parts of the drawings

1: Stem Assembly 2: Top Lead

3: end lead 4: center groove

5: filament 6: stem ceramic

7: Terminal Home 8: Flange Metal

9: Terminal 10: Anowood

11: vane

The present invention relates to a magnetron, and more particularly to a stem assembly which is one of the components of the magnetron.

The magnetron in a microwave oven converts electrical energy into microwaves and irradiates microwaves, etc., to irradiate the foods to be processed. Microwaves stimulate water molecules contained in foods and cause severe translational movement. It is configured to cook food by generating heat.

Magnetrons, which are currently widely used, include an anode assembly, an output assembly mounted via a pole piece at the top of the anode assembly, and a pole at the bottom of the anode assembly. Body assembly consisting of a combination of the cathode assembly (cathode assembly) mounted via the piece, the output assembly of the body assembly and the magnet attached to the cathode assembly, the cooling of the anodwood assembly It consists of a multi-layer cooling fins attached to the outer circumferential surface, a yoke and a mounting yoke surrounding them, and a shielding box mounted on the bottom of the yoke.

The interior of the body assembly must be evacuated to high vacuum, which allows for more efficient release of hot electrons, thereby enabling oscillation similar to cyclotron radiation.

The anode assembly is a cylindrical anode (10) made of a metal, such as copper, the vane (11), which is mounted on the inner surface of the anode (10) toward the center of the anode (10), the vanes ( 11) a combination of four large and small strap rings mounted at the top and bottom of the vanes and an antenna fixed to one of the vanes 11.

The pole piece serves to prevent concentration of the magnetic flux from the magnet fixed to the output assembly and the cathode assembly mounted thereon into the working space and the deviation of the hot electrons.

The output assembly is configured by fixing an exhaust pipe for vacuum to a top shell on which a shield metal ring is mounted via an antenna ceramic, and supplying magnetic flux to an outer circumferential surface of the top shell. Magnet for the interview is attached.

In addition, the cathode assembly is connected to make an electrical connection with the external power source by the lead wires are fixed by the filament for the emission of hot electrons and the cathode is inserted into the hole of the stem ceramic for insulation, and the At the top of the cathode, a hat is fitted with a getter for adsorption of gas, and the stem ceramic is fixed by stem metal. Magnets for supply are interviewed and mounted.

The magnetron, which is used to emit microwaves, heats the filament 5 to emit hot electrons, and the resonant structure formed by the released hot electrons by the anode 17 and the vanes 11 coupled thereto. It is to decelerate the electromagnetic force by the sum of the magnetic force provided by the magnets located above and below the anode 10, and at the same time convert the energy difference at the time of deceleration into electromagnetic waves. Although the principle of electromagnetic wave generation at this time has not been fully explained in academic terms, the anode 10 and the vanes coupled thereto are generally described based on the LC resonance circuit, which is a basic circuit capable of emitting electromagnetic waves. 11) and a gap between the strap rings for electrically connecting the vanes 11 corresponds to a capacitor, a strap ring for electrically connecting the vanes 11 and the entire anode 10 and vanes to which they are coupled. (11) acts as an inductor corresponding to the coil, the space between the end of the filament (5) and the vane 11 that emits hot electrons is called the working space, the released hot electrons have a motion similar to cyclotron, the working space It is understood that the energy that is reduced with the deceleration during the movement of the hot electrons is released in the form of electromagnetic waves.

As mentioned above, the magnetron, which is a core part of the microwave oven, is quite complicated because a large number of parts must be accurately mounted at a predetermined position. Therefore, many studies have been conducted on ways to increase productivity because assembly of the parts is very difficult. There is a need to proceed.

In particular, in view of the improvement of the assemblability, the stem assembly 1 has a center groove 4 of the end lid 3 with the top lid 2 providing electrical connection to the filament 5 bent in the prior art. It was configured to penetrate, and its assembly was not easy, and it was one of the difficult parts of automation.

The top lead 7 and the end lead 3 of the stem assembly 1 should be spaced apart by a certain distance in spite of the vacuum, and in particular, the effective transmission of electrical energy to the filament 5 and the heat resistance against high heat should be maintained. Therefore, the filament (5) is made of tungsten and carbonized after assembly. The top lead (2) and the end lead (3) are also made of metal such as molybdenum. It is mounted on the stem ceramic 6 for insulation, and the upper end ceramic and the lower terminal 9 are shifted with respect to the stem ceramic 6 for the vacuum in the entire body assembly. The metal 8 is placed and connected to maintain confidentiality.

In the case of the conventional stem assembly 1, the bent top lid 2 in the combination of the top lead 2 and the end lead 3, which secures the filament 5 and forms an electrical connection as described above, The work to be attached to the center groove 4 of the end lead 3 is made manually, it is difficult to automate, there is a disadvantage that the productivity is lowered.

Accordingly, an object of the present invention is to provide a stem assembly capable of combining a linear top lead and an end lead, which is devised to solve such a conventional drawback.

It is another object of the present invention to provide a stem ceramic that is suitably modified for coupling between the linear top lead and the end lead.

The present invention having the above object is to use a straight top lead instead of a conventional curved top lead to combine it through the center groove of the end lead.

In another aspect, the present invention is to install two concentric circular flange metal isolated from each other on the upper surface of the stem ceramic in order to maintain the gap between the linear top lead and the end lead.

In another aspect, the present invention is to form a terminal groove of one side of the stem ceramic to which the terminal is inserted in an elliptical form extending outward from the center to maintain the spacing between the terminals.

Hereinafter, the configuration will be described in detail with reference to the accompanying drawings.

Stem assembly for a magnetron having a linear top lead according to the present invention is a curved top lead (2) and a semi-circular flange metal (8) for the electrical connection of the top lead (2) is mounted on the stem ceramic (6) In a conventional stem assembly (1) configured to supply electrical energy to the filaments (5) around the top lid (2) by the coupling between the top lid (2) and the end lid (3), a straight top lid ( 2) allows the top lead 2 to penetrate the center groove 4 of the end lead 3 to engage with the end lead 3, and the distance between the top lead 2 and the end lead 3 A terminal located below the stem ceramic 6 by the flange metal 8 by mounting two concentric flange metals 8 isolated from each other on the upper surface of the stem ceramic 6 so as to be spaced apart from each other. (9) are electrically connected to each other and kept confidential. It characterized by eojim.

The stem assembly (1) is located in the center of the vanes (11) mounted on the inner wall of the anode (10) serves to emit hot electrons, for this purpose the filament (5) for the release of hot electrons to the external power source Simultaneously with the electrical connection with the vacuum to help the release of hot electrons from the filament (5), the stem assembly (1) is mounted below the anode (10), it is configured to maintain airtight If it is permanent, it is as follows.

The stem assembly 1, in which the vanes 11 with straps and antennas are mounted on the inner wall to maintain airtightness, can pass through the terminal 9, which is an electrical conductor. A flange metal sealing the terminal groove 7 of the stem ceramic 6 at the same time as the electrical connection between the terminal 9 and the end lead 3 on the upper surface of the stem ceramic 6 having a terminal groove 7 8) is attached, the end lead 3 is electrically connected thereon, and the top lead 2 into which the filament 5 is inserted via the center groove 4 of the end lead 3 is engaged. To form a circuit, and to secure the electrical contact to the top of the top lid (2) while at the same time to ensure that the hot electrons emitted from the filament (5) do not leave the working space To prevent hot electron escape.

However, since the top lead 2 and the end lead 3 must be kept energized in a vacuum, the top lead 2 and the end lead 3 must be spaced at least a certain distance to avoid discharge between the top lead 2 and the end lead 3. The bent top lead 2 should be assembled to the center groove 4 of the end lead 3 so as to be assembled. will be.

In the present invention, by replacing the curved top lead 2, the top lead 2 is penetrated through the center groove 4 of the end lead 3 by using the linear top lead 2. And the two concentric flange metals 8 isolated from each other on the upper surface of the stem ceramic 6 so that the distance between the top lead 2 and the end lead 3 is spaced apart. Is done.

The flange metal 8 for electrical connection with the end lead 3 on the upper surface of the stem ceramic 6 uses a flange metal 8 having concentric circles instead of the conventional semicircular flange metal 8. The electrical connection between the terminal 7 and the end lead 3 makes it possible to linearly couple the fixing operation of the end lead 3 and the top lead 2 with respect to the stem ceramic 6.

As described above, the present invention enables the top lead 2 to be straightened in the assembly between the top lead 2 and the end lead 3 so that the top lead 2 can be automatically coupled to the center groove 4 of the end lead 3 as it is. The effect of improving the is provided.

Although the present invention has been described in detail only with respect to the above-described embodiments, it will be apparent to those skilled in the art that the present invention may be changed or modified within the spirit and scope of the present invention, and such changes or modifications are attached to the appended claims. Should be limited by

Claims (2)

A semicircular flange metal (8) for the electrical connection between the curved top lead (2) and the top lead (2) is mounted on the stem ceramic (6) to join the top lead (2) and the end lead (3). In a conventional stem assembly (1) configured to supply electrical energy to the filaments (5) around the top lid (2), the top lid (2) is formed by using the top lid (2) of the end lid (3). The upper surface of the stem ceramic 6 with respect to each other such that the distance between the top lead 2 and the end lead 3 is spaced apart so as to pass through the center groove 4 of Two isolated concentric circular flanges (8) are mounted and electrically connected to the terminal (9) located below the stem ceramic (6) by the flange metal (8) to maintain airtightness. Stem for magnetrons with straight top lids 2, characterized by Assembly. 2. The stem assembly for a magnetron according to claim 1, wherein an elliptical terminal groove (7) is formed in the stem ceramic (6) for the separation between the terminals (9).