12results about "Transit-tube cathodes" patented technology

The utility model discloses a kind of cathode heater subassemblies for klystron electron gun, it is characterized in that, including: cathode base, heater sleeve, heater and detachable heat shield assembly, the upper and lower two end surfaces of cathode base are respectively provided with emitting surface and mounting groove, heater sleeve is detachably fixed in mounting groove, and the end surface of heater sleeve back to cathode base is equipped with accommodating groove;Heater is installed in accommodating groove, and the part of heater in accommodating groove is wrapped with insulating layer;Heat shield assembly includes outer heat shield and inner heat shield, outer heat shield is sleeved in cathode base, and inner heat shield is installed in outer heat shield and covers heater sleeve and heater.The utility model can realize reversibility dismounting and maintenance, and heater material volatilization can be avoided directly deposited on the emitting surface of cathode base, help to maintain the emitting surface cleanliness of cathode base, to improve electron emission efficiency, high-temperature solder can also be reduced in use, reduce cost.

The application discloses a cathode filament, a cathode assembly, a magnetron and a microwave cooking electric appliance. The cathode filament is used for the magnetron, the cathode filament is in a spiral structure, the cathode filament comprises two non-main emission areas and a main emission area, the two non-main emission areas are connected to two sides opposite to the main emission area along the length direction of the cathode filament, and the pitch of the non-main emission area is greater than the pitch of the main emission area. In the cathode filament, the pitch of the non-main emission area outside the main emission area is greater than the pitch of the main emission area, the stress of the non-main emission area can be more dispersed, the stress of the cathode filament at the non-main emission area can be effectively reduced, and the breaking resistance of the cathode filament after carbonization is improved.

The application discloses a cathode filament, a cathode assembly, a magnetron and a microwave cooking appliance. The cathode filament has a spiral structure, and a filament material of the cathode filament comprises a filament core and a carbonized layer, the carbonized layer at least wraps the filament core in a circumferential direction of the filament core, a material of the filament core comprises lanthanum tungsten material, and the carbonized layer comprises a lanthanum tungsten carbonized layer. In the cathode filament, the material of the filament core comprises the lanthanum tungsten material, and the carbonized layer comprises the lanthanum tungsten carbonized layer, which reduces the work function of the cathode filament to a certain extent, improves the migration ability of rare earth elements in the cathode filament, and thus the electron emission ability of the cathode filament can be improved to a certain extent, so that the magnetron can adapt to more power requirements of the microwave cooking appliance.

The present application relates to a cathode and a manufacturing method thereof. The method includes: mixing and reacting cations containing a cathode element with a precipitant in a solution to obtain a gelatinous precipitate; and coating the gelatinous precipitate on a surface of a cathode substrate, which is configured for forming the cathode.

This invention discloses an oxide cathode and its sintering apparatus. The oxide cathode includes a cathode cylinder and a porous sponge layer. The cathode cylinder has two annular stepped surfaces, which are spaced apart from each other along the axial direction of the cathode cylinder. The cathode cylinder also has a sintering region located between the two stepped surfaces. The sponge layer is disposed within the sintering region, with its two ends respectively attached to the two stepped surfaces. Simultaneously, the sponge layer does not protrude from the stepped surfaces radially within the cathode cylinder. This invention can effectively suppress the axial scattering of electrons from the non-emission region of the oxide cathode, reduce interference with high-frequency fields, reduce the bombardment of the magnetron anode end cap by scattered electrons from the non-emission region, effectively solve the oxidation problem of the anode end cap during magnetron use, and improve the overall performance of the magnetron.

The application discloses a strip-shaped multi-beam electron gun, and relates to the technical field of electronic devices, which comprises a cathode array assembly, a multi-beam focusing electrode assembly and a multi-beam anode assembly arranged in sequence along an electron transmission direction; the cathode array assembly is composed of a plurality of array-distributed emission cathodes for emitting electron beams; an acceleration electric field is formed between the cathode array assembly and the multi-beam anode assembly; the multi-beam focusing electrode assembly is arranged on the emission side of the cathode array assembly; the grooves and the baffles of the multi-beam focusing electrode assembly are used for compressing and controlling the shape, size and beam waist position of the multi-electron beams, so that the effect of focusing multi-electron beams by a single focusing electrode is achieved; the plurality of anode channels, the plurality of focusing holes and the plurality of emission cathodes are coaxially arranged in one-to-one correspondence; the electrons emitted by the emission cathodes enter the size-gradually-changing anode channels after being accelerated by the electric field and compressed and shaped by the focusing electrode, so that the multi-beam strip-shaped electron beam output with large current and high quality is realized, and the guarantee of the electron source for the high-power output of the terahertz source is provided.

Provided is an electromagnetic wave generation device with which it is possible to determine the cause of an abnormality occurring in the interior thereof.　The present invention comprises: a negative electrode (1); a first positive electrode (2) which is disposed facing the negative electrode and through which electrons can pass; a cylindrical waveguide (3) that is disposed on the side of the first positive electrode opposite from the negative electrode and guides electromagnetic waves; an output window (30) that is disposed at the end portion of the waveguide on the side opposite from the first positive electrode and outputs electromagnetic waves; a first current sensor (41) that detects current data pertaining to an electron beam emitted from the negative electrode; a second current sensor (42) that detects current data pertaining to the electron beam traveling within the waveguide; and an abnormality determination device (60) that determines an internal abnormality on the basis of the current data detected by the first current sensor and the current data detected by the second current sensor.

The application discloses a cathode electron emitter, a cathode assembly, a magnetron and a microwave cooking electric appliance. The cathode electron emitter is used for the magnetron and is in a cylindrical shape. The cathode electron emitter is in the cylindrical shape, so that the internal stress of the cathode electron emitter can be effectively improved, and the defective rate of the cathode electron emitter can be reduced to a certain extent.

The application discloses a cathode filament, a cathode assembly, a magnetron and a microwave cooking appliance. The cathode filament comprises a filament core and a carbonized layer, the carbonized layer at least wraps the filament core in the circumferential direction of the filament core, the material of the filament core comprises lanthanum tungsten material, the carbonized layer comprises a lanthanum tungsten carbonized layer, and the working voltage of the cathode filament is 2.0-2.6 volts or the working current is 7-8.8 amperes. In the cathode filament, the material of the filament core comprises lanthanum tungsten material, and the carbonized layer comprises a lanthanum tungsten carbonized layer, so that the electron emission capacity of the cathode filament can be improved to a certain extent, the cathode filament can stably emit electrons at a lower working voltage (2.0-2.6 volts) or working current (7-8.8 amperes), the thermal load of the cathode filament is reduced, and the working temperature of the cathode filament is lowered.

The application discloses a microwave cooking utensil control method, a microwave cooking utensil and a storage medium. The microwave cooking utensil comprises a magnetron, the magnetron comprises a cathode filament, the cathode filament comprises a filament core and a carbonized layer, the carbonized layer at least wraps the filament core in a circumferential direction of the filament core, a material of the filament core comprises lanthanum tungsten material, and the carbonized layer comprises a lanthanum tungsten carbonized layer. The control method comprises the following steps: energizing the magnetron to start the magnetron; and after the magnetron is started, reducing the working power of the cathode filament. In the microwave cooking utensil, the working temperature of the cathode filament can be reduced to a certain extent, and the working life of the cathode filament is prolonged.

A cathode filament (100), a cathode electron emitter (500), a cathode assembly (300), a magnetron (200), and a microwave cooking appliance are disclosed. The cathode filament (100) has a spiral structure, the wire material of the cathode filament (100) comprises a filament core (14) and a carburized layer (16), the carburized layer (16) covers the filament core (14) at least in the circumferential direction of the filament core (14), the material of the filament core (14) comprises a lanthanum-tungsten material, and the carburized layer (16) comprises a lanthanum-tungsten carburized layer.

The application discloses a foilless diode for inhibiting undesired electron emission and backflow electron beams and a design method thereof, and solves the technical problems that the methods for inhibiting undesired electron emission and backflow electron beams of permanent magnet guided foilless diodes are high in cost or poor in inhibition effect, wherein the foilless diode for inhibiting undesired electron emission and backflow electron beams comprises an insulating sub, an anode outer cylinder, a cathode lead, a cathode base, a permanent magnet and a magnetic steel; the cathode lead and the cathode base are both hollow structures; the magnetic steel is embedded in the interiors of the cathode lead and the cathode base, is used for attracting the surrounding electrons through the magnetism of the magnetic steel, and pulls back the undesired electrons to the cathode lead and the cathode base, so as to improve the electron emission threshold of the cathode lead and the cathode base; the magnetic steel cooperates with the magnetic field of the permanent magnet, so that the magnetic force lines around the backflow electron beams are distributed along the surface of the cathode lead and finally converge at the cathode base, and then the backflow electron beams are collected by the cathode lead and the cathode base.