KR0139337Y1 - Multibeam tube - Google Patents

Abstract

The present invention relates to a multi-beam vacuum tube, in particular, by forming a U-shaped cavity in the collector plate to prevent the reflection of the electron beam can increase the efficiency of the product and has a very excellent effect of improving the performance of the product. In addition, it is possible to prevent the collector plate from overheating by forming a short distance between the electron beam impingement surface of the collector plate to which the electron beam is incident and the heat dissipation plate that emits heat, thereby maintaining a good performance of the product.

Description

Multi Beam Vacuum Tube

1 is a cross-sectional view of a multi-beam vacuum tube according to an embodiment of the present invention.

2 is a cross-sectional view taken along the line A-A of FIG.

3 is a cross-sectional view of a multi-beam vacuum tube according to the prior art.

* Explanation of symbols for main parts of the drawings

2: cathode 12: magnetic force generating means

70: drift passage 90: collector

91: cavity 92: collector plate

94: heat dissipation rod 96: heat dissipation plate

The present invention relates to a multi-beam vacuum tube, and more particularly, to a multi-beam vacuum tube having a cavity formed on the collector plate to prevent reflection of the electron beam.

As shown in FIG. 3, the multi-beam klystron of the conventional multi-beam vacuum tube includes a cathode 2 for generating an electron beam, a drift passage 70 for moving the electron beam generated in the cathode 2, and the drift passage 70. Magnetic force generating means 12 for generating a magnetic force to prevent the diffusion of the electron beam to move the ()), and the collector 200 for collecting the electron beam moved through the drift passage (70).

However, since the conventional multi-beam vacuum tube configured as described above has a simple flat plane such that the collector plate 202 of the collector 200 is perpendicular to the direction of incidence of the electron beam, the electrons in the electron beam hit the collector plate 202. Some of the electrons were reflected in the drift passage 70.

When the electron beam is reflected in the drift passage 70, there is a problem that the efficiency of the product is lowered by preventing the progress of the electron beam.

In addition, since the distance D3 between the surface 202a of the collector plate 20 and the heat dissipation plate 204 that strikes the electron beam is large, heat generated in the collector plate 202 is transferred to the heat dissipation plate 204. It took a lot of time. Therefore, the temperature of the collector plate 202 is high, so that the temperature of the magnetic force generating means 12 has a problem that the overall performance of the product is lowered and the efficiency of the product is lowered.

Therefore, this paper is made to solve the above problems, and an object of the present paper is to provide a multi-beam vacuum tube that can increase the efficiency of the product and improve the performance of the product.

In order to achieve the above object, the multi-beam vacuum tube according to the present invention includes a cathode (2) for generating an electron beam, a drift passage (70) for moving the electron beam generated in the cathode (2), and the drift passage (70). The magnetic force generating means 12 for generating the magnetic force and the electron beam moving the drift passage 70 and the electron beam moving the drift passage 70 at the same time to prevent the diffusion of the electron beam to the drift passage 70 Characterized in that it consists of a collector 90 to prevent the reflection to.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

As shown in FIG. 1, the multi-beam vacuum tube according to the embodiment of the present invention moves the plurality of electron beams emitted from the cathode 2 to the collector 90 to the cavity 76, 78, 80, 82. It is a multi-beam klystron that generates electromagnetic energy and generates high frequency by previous magnetic energy.

As shown in FIG. 1, the cathode 2 emitting a plurality of electron beams has an alternating current 120V through the heater rod 4 and the emitter rod 6 and the heater rod 4 and the emitter rod 6. Or a heater 8 that generates heat by receiving a voltage of AC 220V, and an emitter 10 that is excited by heat emitted from the heater 8 to emit electrons.

A plurality of emitters 10a are formed on the surface of the emitter 10 so as to emit a plurality of electron beams, and the emission of the emitter 10 is suppressed in areas other than the emitter 10a. To this end, a thin molybdenum plate 10b is attached.

The plurality of discharge portions 10A is formed in a plurality of annular columns of one or more rows, and is formed of 25 annular columns of three rows. The emitter 10a is also concave inwardly of the emitter 10 to collect electrons emitted from the emitter 10a into one place, as shown in FIG. The heater 8 and the emitter 10 are connected in series to power supply means (not shown) for outputting AC 120V or AC 220V via the heater rod 4 and the emitter rod 6. have.

The heater rod 4 and the emitter rod 6 are supported by the housing 13.

The magnetic force generating means 12 for generating magnetic force to prevent diffusion of the plurality of electron beams emitted from the cathode 2 is placed at the front end of the drift passage 70 to apply magnetic flux to the drift passage 70 through which the electron beam moves. The first permanent magnet 14 installed at the rear end of the drift passage 70 to apply magnetic flux to the drift passage 70 through which the electron beam moves, and to the drift passage 70. The first pole piece (POLE PIECE) 20 and the second pole piece 22 for guiding the magnetic flux from the first permanent magnet 14 to the second permanent magnet 16 so as to distribute the magnetic flux with uniform density. And yokes 24 and 30 for guiding the magnetic flux from the second permanent magnet 16 to the first permanent magnet 14.

The first permanent magnet 14 and the second permanent magnet 16 are annularly formed to uniformly apply the magnetic flux to the drift passage 70 arranged in an annular shape. The first permanent magnet 14 has an N pole in the center side and an S pole in the outer side. On the other hand, the second permanent magnet 16 has an S pole in the center side and an N pole in the outer side. In addition, the diameter of the circle inscribed in the first permanent magnet 14 and the second permanent magnet 16 is the diameter of the circle formed by the group of the drift passage 70 so that the magnetic flux density where the electron beam is present is uniform. It is designed to be larger than the diameter. The first permanent magnet 14, the second permanent magnet 16, and the yokes 24 and 30 are fixed to the holder 23.

The first pole piece 20 and the second pole piece 22 are formed with the same number of holes 20a and 22a as the number of the drift passages so as to supply a uniform magnetic flux density to the drift passage described later. The second pole piece 22 is connected to a drift tube described later so that the electron beam maintains a constant radius through the fourth cavity described later to the end.

The density modulating means 60 for modulating the density of the electron beam emitted from the cathode 2 primarily modulates the electron beam emitted from the cathode 2 to amplify the first cavity 62 to amplify RADIO FREQUENCY power. ), And a second cavity 64 that amplifies high frequency power by secondarily densely modulating the electron beam emitted from the cathode 2, and amplifies the high frequency power by densely modulating the electron beam emitted from the cathode 2. The third cavity 66, the fourth cavity 68 for amplifying high frequency power by densely modulating the electron beam emitted from the cathode 2, and the collector direction described below for the electron beam emitted from the cathode 2 It consists of a drift tube 72 formed a drift passage 70 to move to.

The resonance frequencies of the second cavity 64 and the third cavity 66 are set slightly larger than the resonance frequencies of the first cavity 62 and the fourth cavity 68 in order to effectively increase the density modulation of the electron beam.

The drift passage 70 is formed in an annular shape of one or more rows by the drift tube 72 made of copper so as to be parallel to the central axis of the first cavity 62 to the fourth cavity 68. The drift passages 70 of the drift tube 72 are also formed in the same number as the number of electron beams so as to supply uniform magnetic flux to the drift passages 70. In this embodiment, nine drift passages 70 are formed in two rows of rings.

Feedback between the third cavity 66 and the first cavity 62 so that a portion of the energy of the high frequency power is returned from the second cavity 64 to the fourth cavity 68 to the first cavity 62. The channel 74 is formed.

In addition, the size of the gap 82 of the fourth cavity 68 is smaller than the size of the other gaps 76 and 78.80 in order to increase the characteristics of the density modulating means 60.

The high frequency generating means 84 for generating a high frequency by coupling the energy of the electron beam density modulated by the density modulating means 60 is magnetically coupled to the fourth cavity 68 to form the fourth cavity 68. There is a coupling ring 86 for absorbing the energy of the electron beam passing through, and an antenna 88 for outputting the energy absorbed by the coupling ring 86 at a high frequency.

The collector 90, which collects the electron beam that has traveled the drift passage 70, has a collector plate having a cavity 91 formed therein to prevent the electron beam that has traveled the drift passage 70 from being reflected back into the drift passage 70. And a heat dissipation rod 94 and a heat dissipation plate for dissipating heat generated by the collector plate 92 to the outside.

The collector plate 90 is made of oxygen-free copper having excellent thermal conductivity and corrosion resistance.

The number of cavities 91 of the collector plate 92 is equal to the number of electron beams generated at the cathode 2 by the cavity wall 92a to eliminate mutual interference between the electron beams as shown in FIG. And the front end face of the cavity 91 is circular as shown in FIG. 2, and the side cross section of the cavity 91 is the electron beam impingement surfaces 91a, 91b as shown in FIG. ) Is a c-shape at right angles.

The heat dissipation plate 96 is forcibly fitted to the heat dissipation rod 94, and the heat dissipation rod 94 is brazed to the collector plate 92. The collector plate 92 is an output terminal of a second power supply means (not shown) for outputting a voltage of 600V DC so that a potential load for accelerating the electron beam is formed between the emitter 10 and the collector plate 92. Is connected to.

Hereinafter, the effect of the multi-beam vacuum tube according to an embodiment of the present invention configured as described above will be described.

First, an AC voltage of 220 V is applied between the heater rod 4 and the emitter rod 6, and a DC voltage of 600 V is applied to the collector plate 92. Then, a voltage of 220 V AC is applied to the heater 8 and the emitter 10 to generate the heater 8. When the heater 8 generates heat, the emitter 10 is heated to 1000 ° C. or more to emit a plurality of electrons continuously from the emitter 10a of the emitter 10 to form an electron beam.

The electron beam emitted from the emitter 10a of the emitter 10 toward the collector plate 92 is caused by the potential difference of 600 V formed between the emitter 1 and the collector plate 92. 92) is accelerated. The electron beam accelerated toward the collector plate 92 reaches the gap 76 of the first cavity 62. An electric field is formed in the gap 76 of the first cavity 62 due to the small signal high frequency incident from the external small signal high frequency means (not shown) into the cavity 62a of the first cavity 62. From this electric field, electrons in the electron beam are forced to generate speed modulation. When the electrons in the electron beam are subjected to speed modulation, the density of the electron beam is modulated according to the position in the drift passage 70.

When the electron beam continues and reaches the gap 78 of the second cavity 64, the speed change of the electron occurs again due to the interaction between the second cavity 64 and the electron beam, which causes the high density of the portion within the battery beam. The electron density becomes higher. When the electron beam continues to reach the gap 80 of the third cavity 66, the same operation as that of the gap 78 of the second cavity 64 becomes higher, and the portion having the higher electron density is once again increased to a higher density. . Thus, a dense electron beam is formed that is sufficient to generate a high energy microwave.

When an electron beam having sufficient electron density reaches the gap 82 of the fourth cavity 68, which is the output cavity, an induced current is induced in the fourth cavity 68, thereby causing an electric field and a magnetic field to be induced in the fourth cavity 68. The electric field is mainly present in the gap 82 of the fourth cavity 68 and the magnetic field is present in the cavity 68a of the fourth cavity 68.

Next, the coupling ring 86 draws high frequency energy to the outside by coupling the magnetic field energy in the cavity 68a of the fourth cavity 68, and the high frequency emitted to the outside of the space required by the antenna 88. For example, it is radiated to the cooking chamber of the microwave oven.

As described above, the electron beam that guides the electromagnetic energy into the cavity 68a of the fourth cavity 68 while passing through the gap 82 of the fourth cavity 68 continues with some kinetic energy to continue the collector plate. It collides with the electron beam collision surface 91a of the cavity 91 of 92. As shown in FIG. Then, all the electrons in the electron beam 18 that collide with the electron beam impingement surface 91a of the collector plate 92 are absorbed by the collector plate 92.

In this case, the distance D2 between the electron beam collision surface 91a and the drift passage 70 is large, and the electron beam collision surface 91b is formed perpendicular to the electron beam collision surface 91a. The electrons reflected at 91a are not reflected by the drift passage 70 but hit the electron beam collision surface 91b and are all absorbed by the collector plate 92.

Next, when all the electrons in the electron beam are absorbed by the collector plate 92, the electrons move to the power line (not shown) connected to the collector plate 92 and disappear.

At the same time, the kinetic energy of the electrons in the electron beam is converted into thermal energy in the collector plate 92 to generate heat in the collector plate 92. In this case, since the distance D1 between the electron beam impingement surface 91a of the collector plate 92 and the heat dissipation plate 96 is short, heat generated in the collector plate 92 is easily transferred to the heat dissipation plate 96. do. At the same time, the heat generated in the collector plate 92 is transferred to the heat dissipation rod 94 and then transferred from the heat dissipation rod 94 to the heat dissipation plate 96. Next, external cool air comes into contact with the heat dissipation plate 96 by the rotation of a cooling fan (not shown), thereby cooling the heat dissipation plate 96 and simultaneously dissipating heat from the heat dissipation plate 96.

On the other hand, as a multi-beam vacuum tube according to an embodiment of the present invention described above, the density modulating means 60 is composed of four cavities of the first cavity 62 to the fourth cavity 68 and the density modulating means 60 Before and after the multibeam klystron with permanent magnets 14 and 16 was described. On the other hand, in another embodiment of the present invention, in the multi-beam cladding rod having two cavities and the drawing is installed in the cavity to output high frequency, the reflection of the electron beam on the collector plate is prevented as in the above-described embodiment of the present invention. If a plurality of U-shaped cavities are formed, the same effects as in the above-described embodiment of the present invention can be expected.

As described above, according to the multi-beam vacuum tube according to the present invention, by forming a plurality of U-shaped cavities in the collector plate to prevent the reflection of the electron beam, it is possible to increase the efficiency of the product and to improve the performance of the product. It works.

In addition, it is possible to prevent the collector plate from overheating by forming a short distance between the electron beam impingement surface of the collector plate to which the electron beam is incident and the heat dissipation plate that emits heat, thereby maintaining a good performance of the product.

Claims (3)

In a multi-beam vacuum tube, a cathode (2) for generating an electron beam, a drift passage (70) through which the electron beam generated from the cathode (2) moves, and an electron beam (moving) through the drift passage (70) are prevented from being spread. Collecting the magnetic force generating means 12 for generating a magnetic force and the electron beam moved through the drift passage 70 and at the same time to prevent the electron beam moved through the drift passage 70 is reflected to the drift passage 70 A multi-beam vacuum tube, characterized in that consisting of (90). The collector plate (92) of claim 1, wherein the collector (90) includes: a collector plate (92) having a cavity (91) formed to prevent reflection of an electron beam traveling through the drift passage (70) into the drift passage (70); Multi-beam vacuum tube, characterized in that consisting of a heat dissipation rod 94 and a heat dissipation plate 96 to dissipate heat generated in the collector plate 92 to the outside. 3. The multi-beam vacuum tube according to claim 2, wherein the cavity (91) of the collector plate (92) is formed in the same number as the number of electron beams generated from the cathode (2).