CN1159728A - Antenna feeder of magnetron for electromagnetic range and assembling structure of exhausting tube - Google Patents

Abstract

An antenna feeder and exhaust pipe for a magnetron used in an electromagnetic cooker that can be quickly assembled without deforming the antenna feeder, preventing the deformation of the exhaust pipe and the position change of the antenna feeder during the sealing operation, and stably maintaining the characteristics of the magnetron Assembly structure. Among them, the lower part of the antenna feeder is fixed on the blade. After the above-mentioned antenna feeder is placed in the center of the anode seal, the exhaust pipe is assembled, and then the upper part of the exhaust pipe is sealed off. After the small diameter part of the above-mentioned antenna feeder is inserted The isolated exhaust pipe has a small diameter portion having an inner diameter larger than the outer diameter of the antenna feed line, and a large diameter portion having an inner diameter larger than the small diameter portion.

Description

The assembly structure of the antenna feeder and the exhaust pipe of the magnetron used in the electromagnetic cooker

The invention relates to a magnetron for an electromagnetic cooker, in particular to an assembly structure of an antenna feeder and an exhaust pipe which can prevent deformation and position changes of the antenna feeder when the antenna feeder and the exhaust pipe are assembled.

The structure of the existing magnetron is shown in FIG. 1 . A linear filament 1 is arranged along the central axis of the tube, and a cylindrical anode 2 of a bipolar structure is arranged around it.

In the working space 10 between the above-mentioned filament 1 and the anode 2, permanent magnets 4a, 4b and magnetic poles 20 forming a magnetic field after applying magnetic flux are sequentially arranged on the upper and lower central parts of the lower plate 3 to form a magnetic circuit. Antenna feeder 5 , antenna ceramic 6 , and antenna cap 7 are arranged on the fixed upper plate 19 to transmit the high-frequency energy transmitted from the anode to the outside.

A plurality of blades 8 are radially fixed on the inner side of the anode 2. In order to quickly transfer the heat generated by the impact of hot electrons on the blades 8 to the outside, multiple layers of heat sinks 9 are arranged between the lower plate 3 and the blades 8. On the lower plate 3. The filter box 11, the choke coil 12 and the capacitor 13 are arranged below to prevent the unnecessary high frequency part of the integral multiple of 2,450KHZ fundamental wave generated in the working space 10 from flowing back into the power supply.

Furthermore, the thermoelectron-emitting filament 1 is supported by an upper shield 14 and a lower shield 15 . The central wire 16 and side wires (not shown) exposed from the filter box 11 are fixed on the lower shield 15 , and the part exposed in the filter box is fixed on the terminal 17 . The above-mentioned center wire 16 and side wires are insulated by a cylindrical cathode ceramic 18 .

The working process of the magnetron with the above structure is as follows.

When the magnetic field of the permanent magnets 4a, 4b forms a magnetic circuit between the upper and lower plates 19, 3 and the magnetic pole 20, an electric field is formed between the blade 8 and the filament 1, so the thermal electrons emitted by the filament 1 are separated due to the electric field and the magnetic field. Perform cycloidal motion in the workspace.

Thus, the accelerated thermal electrons are transformed into high-frequency electric energy. At this time, although most of the high-frequency energy transmitted at the same time is the fundamental wave of 2,450KHZ and the higher harmonics of integral multiples of the fundamental wave, the higher harmonics can be removed by the coil 22 provided in the anode seal 21 .

And, as shown in Figure 3, the central part of the antenna feeder 5 that is contained in the exhaust pipe 23 is positioned at the center of the anode seal 21, makes the exhaust pipe 23 be cylindrical, and the insertion portion of the antenna feeder 5 has a diameter ratio The supporting part 5 a with a small inner diameter of the exhaust pipe, when assembling the supporting part 5 a and the exhaust pipe 23 , the antenna feeder 5 is located at the center of the anode seal 21 .

However, in such an existing structure, since there is the above-mentioned support portion 5a larger than the main body portion of the antenna feeder 5, when the antenna feeder 5 is inserted into the inside of the anode seal 21, the support portion 5a having a size larger than the main body portion will be stuck. In the lower section of the exhaust pipe 23. Therefore, there is a problem of generation of deformation.

Also, after the antenna feeder 5 is assembled, a space S is formed between the outer diameter (φ1) of the main body portion of the antenna feeder and the inner diameter (φ3) of the exhaust pipe. Therefore, when the exhaust pipe is sealed and cut using a vacuum sealing process, the antenna feeder is deformed, thereby deforming the assembly of the output portion of the magnetron, and a problem of degradation of magnetron characteristics occurs.

The purpose of the present invention is to provide an assembly structure for the antenna feeder and the exhaust pipe of a magnetron used in an electromagnetic cooker, which can quickly assemble the exhaust pipe without deforming the antenna feeder, and prevents the exhaust pipe from being damaged during the sealing operation. Deformation and changes in the position of the antenna feeder, the characteristics of the magnetron are stably maintained.

The technical composition of the present invention designed to achieve the above-mentioned purpose is that the lower section of the antenna feeder is fixed on the blade, after the above-mentioned antenna feeder is placed in the center of the anode seal, the exhaust pipe is assembled, and then the exhaust pipe is sealed off. In the assembly structure of the antenna feeder and the exhaust pipe of the magnetron for electromagnetic cooker on the upper part of the pipe, the exhaust pipe sealed off after the small diameter part of the above antenna feeder is inserted has a small diameter part with an inner diameter larger than the outer diameter of the antenna feeder, and the inner diameter The larger diameter portion of the antenna feeder is inserted into the larger diameter portion than the small diameter portion.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the attached picture:

Fig. 1 is a longitudinal sectional view of a common magnetron;

Fig. 2 is the longitudinal sectional view of existing magnetron output part;

Fig. 3 is an exploded perspective view of the antenna feeder and the exhaust pipe of Fig. 2;

Fig. 4 is a longitudinal sectional view of the magnetron output part of the present invention;

FIG. 5 is an exploded perspective view of the antenna feeder and the exhaust pipe of FIG. 4 .

Fig. 4 is the longitudinal sectional view of the assembled state of antenna feeder and exhaust pipe, and Fig. 5 is the exploded perspective view of antenna feeder and exhaust pipe of Fig. 4, and the part identical with existing magnetron structure uses identical denoted by symbols, and their descriptions are omitted.

In the magnetron of the present invention, the main part of the antenna feeder 5 whose lower end is fixed on the blade 8 is rod-shaped, and the end is sharpened.

That is to say, the inner diameter of the small-diameter portion 23a of the exhaust pipe 23 that is sealed off after being inserted into the main body of the antenna feeder 5 is made larger than the outer diameter of the antenna feeder 5, and the large-diameter portion 23b of the above-mentioned exhaust pipe 23 is made The connecting portion 23c connecting the above-mentioned large-diameter portion 23b and the small-diameter portion 23a is made into a tapered surface 23d whose outer diameter gradually decreases. When the antenna feeder 5 is assembled in the exhaust pipe 23, the above-mentioned The antenna feeder 5 is inserted into the small diameter portion 23 a through the large diameter portion 23 b of the exhaust pipe 23 .

Therefore, when the antenna feeder 5 is assembled in the exhaust pipe 23, the upper section of the antenna feeder 5 can be guided by the tapered surface 23d of the connecting portion 23c, preventing the end of the antenna feeder from being deformed during insertion, and putting the above-mentioned antenna end smoothly. Guided into the small diameter portion 23a.

In addition, the ratio of the outer diameter φ1 of the antenna feeder 5 to the inner diameter φ2 of the small-diameter portion is φ1=0.8˜0.9φ2. The operation of fitting the antenna feeder 5 into the small-diameter portion 23a of the exhaust pipe is thus easily carried out, and after assembly, the gap between them can be minimized, and deformation of the antenna feeder which occurs during the sealing-off operation can be prevented.

The actions and effects of the present invention having such a configuration will be described below.

When one end of the antenna feeder 5 of the output part is fixed on a blade 8 through the groove formed on the magnetic pole 20, and then the upper section of the antenna feeder 5 is inserted through the large diameter part 23b of the exhaust pipe 23, because the upper section is pointed Head-shaped, forming a tapered surface with an inclination angle θ ranging from 50° to 70°, so the contact area with the large-diameter part 23b of the exhaust pipe is the least, and the antenna feeder can be easily inserted into the exhaust pipe 23 through the large-diameter part 23b .

Once the upper section of the antenna feeder 5 is inserted into the large-diameter portion 23b of the exhaust pipe 23, the pointed upper section of the antenna feeder 5 is guided by the tapered surface 23d formed on the inner surface of the exhaust pipe 23 connecting portion 23c and inserted into the small diameter portion 23b. The diameter portion 23a is in the state shown in FIG. 4 .

Thus, when the antenna feeder 5 is inserted into the exhaust pipe 23, the ratio of the outer diameter φ1 of the antenna feeder 5 to the inner diameter φ2 of the small diameter portion is φ1=0.8φ2˜0.9φ2. Therefore, the antenna feeder 5 can be prevented from being compressed and deformed and moved up when the sealing operation is performed to vacuum-seal the magnetron.

In addition, since the exhaust pipe 23 is made so that the cutting point of the antenna feeder 5 coincides with the joining point of the connecting portion 23c and the small-diameter portion 23a of the exhaust pipe 23, when cutting at the above-mentioned cutting point, the above-mentioned sealing can be reduced. point deviation.

As described above, according to the present invention, by changing the shape of the exhaust pipe and the antenna feeder, the assembly operation can be performed quickly and correctly, and the deformation and position change of the antenna feeder can be prevented when the sealing operation is performed after assembly. Therefore, the center of the antenna feeder can be made to coincide with the center of the anode seal, so that the output characteristics, noise characteristics, stability performance, etc. of the magnetron can be improved.

Also, since the small diameter portion is formed, raw material can be saved compared to the existing exhaust pipe.

Claims (5)

1. An exhaust pipe structure of a magnetron for an electromagnetic cooker, which has the lower section of the antenna feeder fixed on the blade, after placing the above-mentioned antenna feeder at the central part of the anode seal, assemble the exhaust pipe, and then Antenna feeder and exhaust pipe assembly structure of the magnetron on the upper part of the sealed off exhaust pipe, It is characterized in that the exhaust pipe sealed off after the small-diameter part of the antenna feeder is inserted has a small-diameter part with an inner diameter larger than the outer diameter of the antenna feeder, and a large-diameter part inserted into the antenna feeder with an inner diameter larger than the small-diameter part. 2. the exhaust pipe structure of magnetron for electromagnetic range as claimed in claim 1, is characterized in that, the large-diameter part and the small-diameter part of described exhaust pipe gradually reduce from the large-diameter part to the small-diameter part internal diameter The small connecting parts are connected. 3. the antenna feeder structure of electromagnetic cooker magnetron as claimed in claim 1, is characterized in that, the antenna feeder that inserts small-diameter part behind the above-mentioned large-diameter part of exhaust pipe, it inserts exhaust pipe small-diameter part That part is rod-shaped. 4. The assembly structure of magnetron antenna feeder and exhaust pipe as claimed in claim 1, wherein the ratio of the outer diameter φ1 of the antenna feeder to the inner diameter φ2 of the small diameter portion of the exhaust pipe is φ1=0.8φ2～0.9φ2. 5 . The antenna feeder structure of a magnetron for electromagnetic cooker as claimed in claim 3 , wherein the upper portion of the antenna feeder inserted into the small diameter portion through the large diameter portion of the exhaust pipe is pointed. 6 .

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