26results about "Transit-tube cooling methods" patented technology

A magnetron and microwave heating device, wherein the magnetron includes a tube core (21), a first tube shell (21a), a second tube shell (21b), an output ceramic (22), an antenna cap (23), and an antenna (24), wherein the first tube shell (21a), the tube core (21), the second tube shell (21b), the output ceramic (22), and the antenna cap (23) are connected in sequence, and the antenna (24) enters the tube core (21), and then enters the antenna cap (23) sequentially through the second tube shell (21b) and the output ceramic (22), and a height H1 of the second tube shell (21b) relative to the tube core (21) is 14 mm or less, and a ratio H1 / S of the height H1 of the tube core (21) to a cross-sectional area S of the antenna (24) is within a range of 0.4 to 3.3.

The invention relates to the field of high-frequency electronics, and discloses an ultra-wideband traveling wave tube which comprises a focusing control electron gun, a slow wave system and a three-stage depressed collector. The focusing control electron gun is used for providing stable electron beams and realizing effective focusing and acceleration of the electron beams through a cathode assembly, a heating wire, a bunching electrode and an anode assembly which are accurately designed; the slow wave system is composed of an input high frequency and an output high frequency, high-efficiency energy exchange between an input signal and an electron beam is ensured through a conical spiral line and a composite tube shell structure, and therefore signal amplification is achieved. The three-stage depressurization collector effectively recovers residual electron beams through a step-by-step depressurization design, energy loss is reduced, and the total efficiency of the traveling wave tube is improved. The traveling wave tube can provide output power exceeding 100 W in the frequency band of 2-18 GHz, the gain is larger than 25 dB, and the total efficiency is larger than 30%. Due to the excellent performance, the method can be widely applied to the fields of communication, radar, electronic countermeasures and the like.

The invention provides a high-power-density fully-sealed microwave generator. The high-power-density fully-sealed microwave generator comprises a cabinet, a magnetron assembly, a condenser and a first cooling fan, wherein a containing space is formed in the cabinet, and the magnetron assembly, the condenser and the first cooling fan are arranged in the cabinet. The magnetron assembly is electrically connected to a switching interface located in the cabinet, the condenser and the first cooling fan are connected to the cabinet and are arranged on the lateral upper portion of the magnetron assembly, and a water inlet and a water outlet of the condenser are connected to water way interfaces located in the cabinet through pipeline assemblies respectively; the first cooling fan and the condenser are arranged in a spaced mode in the length direction and / or the width direction of the cabinet so as to extract air, cooled by the condenser, in the containing space and blow the air to the magnetron assembly. Therefore, the effect of cooling the magnetron assembly in the sealed cabinet body space is achieved.

The invention discloses a magnetron, which comprises a tube core, a magnet, a plurality of radiating fins and a radiating bracket, and is characterized in that the axis of the tube core extends along a second direction; the magnets are located at two axial ends of the tube core; the plurality of radiating fins are arranged along the axial direction of the tube core, a gap is formed between every two adjacent radiating fins, each radiating fin is provided with a central hole for the tube core to pass through, a notch is formed in the side edge of each radiating fin along the third direction, and the second direction is perpendicular to the third direction; the tube core, the magnet and the plurality of radiating fins are arranged in the radiating support, and the notch is close to the side wall of the radiating support. According to the magnetron provided by the embodiment of the invention, the gaps are formed in the cooling fins, so that the heat exchange amount of the airflow and the tube core can be improved, the tube core can be better cooled, the temperature rise condition of the tube core is relieved, and the temperature rise condition of the magnetron is finally relieved.

The present application belongs to the field of microwave source technology in vacuum electron devices, and particularly relates to a same-voltage integrated double-frequency output magnetron for microwave oven, which is provided with two magnetrons with different frequencies and sizes, a heat dissipation structure and a magnetic circuit structure, the two magnetrons share one magnetic circuit structure, and the magnetron part and the heat dissipation structure are arranged in the magnetic circuit structure; the heat dissipation structure is provided with three parts of left heat dissipation fins, middle heat dissipation fins and right heat dissipation fins, wherein the left heat dissipation fins are arranged outside one magnetron and extend to the left, the right heat dissipation fins are arranged outside the other magnetron and extend to the right, and the two magnetrons are fixedly connected through the middle heat dissipation fins. In the present application, the same-voltage integrated double-frequency output magnetron is used, the frequencies of the two magnetrons are 2.45 GHz and 5.8 GHz respectively, the frequency difference is large, and the mutual coupling between the two outputs is small; and the double-frequency structure adopts the same voltage and is designed in an integrated manner, so that the structure is simple and suitable for various microwave ovens, and the placement problem of the two magnetrons and the heating uniformity problem are solved.

An insulative assembly for a microwave vacuum tube comprising: an oil tank and at least one high temperature or high voltage component arranged in the oil tank. The oil tank has an internal groove. The at least one high temperature or high voltage component is spaced apart from the internal groove within the oil tank; wherein the internal groove is configured to separate gas bubbles from the at least one high temperature or high voltage component within the oil tank during operation.

The invention discloses a microwave pulse compressor and a particle accelerator. Wherein the microwave pulse compressor comprises a dual-mode circular polarization coupler, a spherical resonant cavity and a low-temperature cooling system, a coupling hole is formed in the spherical resonant cavity, and the dual-mode circular polarization coupler is connected with the spherical resonant cavity through the coupling hole; the low-temperature cooling system comprises a liquid nitrogen low-temperature chamber and a cooling device, at least part of the dual-mode circular polarization coupler and the spherical resonant cavity are arranged in the liquid nitrogen low-temperature chamber so as to cool the spherical resonant cavity and keep the spherical resonant cavity in a low-temperature state, the environment temperature of the low-temperature state ranges from 40 k to 80 k, and the cooling device is arranged in the liquid nitrogen low-temperature chamber. The cooling device comprises liquid nitrogen and a liquid nitrogen circulating pump, or the cooling device comprises a refrigerating machine. The microwave pulse compressor is low in power loss, compact in structure, low in cost and high in reliability.

The invention discloses a broadband coaxial-circular waveguide output structure of a coaxial gyrotron traveling wave tube, and relates to the field of microwave and millimeter wave passive devices. The structure comprises a coaxial outer conductor, a coaxial inner conductor and a supporting structure arranged between the coaxial outer conductor and the coaxial inner conductor, the supporting structure comprises a plurality of supporting units distributed along the circumference, the widths of the supporting units are increased and then reduced along the axial direction, and the middle sections of the adjacent supporting units are quasi-rectangular waveguide cavities; two cavities with the two ends communicated are dug in the coaxial inner conductor, and the coaxial inner conductor, the supporting unit and the coaxial outer conductor are provided with penetrating through holes used for injecting cooling liquid into the cavity and enabling the cooling liquid to flow out of the other cavity. The supporting structure is adopted to solve the supporting problem of the output part of the coaxial gyrotron traveling wave tube, and has the advantages of wide band and high mode conversion efficiency; in addition, through the arrangement of the through hole and the cavity structure, the cooling of the output part of the coaxial gyrotron traveling wave tube is realized.

The invention discloses a phase change circulation heat dissipation device for a slow wave structure of a traveling wave tube and the traveling wave tube comprising the same, and relates to the technical field of microwave vacuum electronics, the heat dissipation device comprises an internal heat absorption unit integrated on a slow wave structure body base material, an external cooling unit arranged outside the traveling wave tube and a sealed circulation pipeline connecting the internal heat absorption unit and the external cooling unit, the three parts form a closed loop which is filled with a working medium. During working, the micro-scale flow channel of the internal heat absorption unit directly absorbs heat of the slow-wave structure, so that a working medium is vaporized; the steam flows to an external cooling unit for condensation and heat release under the action of pressure difference; condensate is driven by gravity and capillary force to flow back to the interior, and self-sustaining circulation is formed. Efficient heat dissipation under extremely high heat flux is achieved through phase change latent heat, the vacuum compatibility problem is thoroughly solved through closed independent circulation, the structure is compact, external strong driving force is not needed, the working stability of the traveling wave tube is remarkably improved, and the service life of the traveling wave tube is remarkably prolonged.

The invention discloses a magnetron, which comprises: a heat dissipation channel extending in a first direction in a heat dissipation support; a tube core arranged in the heat dissipation support and extending in a second direction; a magnet arranged in the heat dissipation support and located at both ends of the tube core in the second direction, and the width of the magnet in the third direction is greater than the width of the tube core in the third direction; a plurality of heat dissipation fins, the heat dissipation fins having a central hole and the tube core passing through the central hole, the plurality of heat dissipation fins arranged in the second direction and gaps between adjacent heat dissipation fins, at least one of the two sides of the heat dissipation fins opposite to each other in the third direction is provided with a notch, and the notches of at least a part of the plurality of heat dissipation fins are opposite in the second direction, so as to be suitable for airflow to flow from both ends of the heat dissipation support to the middle along the second direction, the notch and the central hole are opposite in the third direction, and the first direction, the second direction and the third direction are perpendicular to each other. According to the magnetron of the invention, the overall heat dissipation effect can be improved.

This document discloses a high-power device for providing a radio frequency electromagnetic field to a waveguide. The device includes a magnetron configured to provide the radio frequency electromagnetic field to the waveguide and a control unit configured to control the magnetron's output of radio frequency energy to the waveguide. The magnetron includes a high-voltage pulse connector enclosed in a housing, a heater connector configured to allow electrical connectors to penetrate the housing, and a mechanism configured to transmit data between the magnetron and the control unit.

A magnetron and microwave heating device, wherein the magnetron includes a tube core (21), a first tube shell (21a), a second tube shell (21b), an output ceramic (22), an antenna cap (23), and an antenna (24), wherein the first tube shell (21a), the tube core (21), the second tube shell (21b), the output ceramic (22), and the antenna cap (23) are connected in sequence, and the antenna (24) enters the tube core (21), and then enters the antenna cap (23) sequentially through the second tube shell (21b) and the output ceramic (22), and a height H1 of the second tube shell (21b) relative to the tube core (21) is 14 mm or less, and a ratio H1 / S of the height H1 of the tube core (21) to a cross-sectional area S of the antenna (24) is within a range of 0.4 to 3.3.

An electromagnetic power source (100, Fig. 1), e.g. a cylindrical or co-axial cavity gyrotron, surface wave source, klystron or travelling wave tube, configured to generate microwave or terahertz power modes for heating plasma in a nuclear fusion reactor (300, Fig. 6) is described. The power source comprises an excitation cavity 108 configured to generate an electromagnetic power mode 112, wherein the excitation cavity comprises a first, inner layer 122 thermally coupled to a second, outer layer 124, wherein the first layer comprises electrically conducting metal, e.g. copper, silver or gold, and the second layer comprises diamond. The diamond of the second layer may be a metal composite diamond or may be formed by chemical vapour deposition (CVD). The second layer may, for example, comprise: a unitary structure; a plurality of coaxially stacked, hollow cylindrical or toroidal segments (130, Fig 8a); or a plurality of rectangular bars joined using a brazing or bonding material (123, Fig. 4).

A magnetron and a microwave heating device. The magnetron comprises a tube core (21), a first tube housing (21a), a second tube housing (21b), output ceramic (22), an antenna cap (23), and an antenna (24). The first tube housing (21a), the tube core (21), the second tube housing (21b), the output ceramic (22) and the antenna cap (23) are connected in sequence. The antenna (24) extends into the tube core (21), and sequentially passes through the second tube housing (21b) and the output ceramic (22) and then extends into the antenna cap (23). The height H1 of the second tube housing (21b) relative to the tube core (21) is not greater than 14 millimeters, and the ratio H1 / S of the height H1 of the tube core (21) to the cross-sectional area S of the antenna (24) is within the range of 0.4 to 3.3.

Provided are a magnetron and a microwave heating device. The magnetron includes a tube core, a first tube shell, a second tube shell, an output ceramic, an antenna cap, and an antenna. The first tube shell, the tube core, the second tube shell, the output ceramic, and the antenna cap are connected in sequence. The antenna extends into the tube core, and sequentially passes through the second tube shell and the output ceramic and extends into the antenna cap. A height H1 of the second tube shell relative to the tube core is smaller than or equal to 14 mm, and a ratio H1 / S of a height H1 of the tube core to a cross-sectional area S of the antenna ranges from 0.4 to 3.3.

This invention discloses a coaxial magnetron with an externally loaded metamaterial, comprising, from the inside out, an anode blade assembly, an anode cylinder, a metamaterial layer, and an outer cylinder. The anode blade assembly consists of multiple anode blades arranged in a uniform ring array, with adjacent anode blades forming a resonant inner cavity. The anode cylinder is fitted outside the anode blade assembly, and its wall has multiple coupling slots. The anode cylinder and the outer cylinder form a coaxial outer cavity, and the inner and outer cavities are connected and communicate with each other through the coupling slots. The metamaterial layer is disposed between the anode cylinder and the outer cylinder to connect the two. The metamaterial layer consists of multiple metamaterial units arranged in a ring array, and each metamaterial unit is a copper sheet with a hollow dumbbell pattern. This invention improves the compactness of the coaxial magnetron while ensuring efficiency, suppresses the competitive mode of the coaxial magnetron, and enhances the anode heat dissipation performance of the coaxial magnetron.

An electromagnetic power source (100) configured to generate microwave power modes for heating plasma in a nuclear fusion reactor (200) is described. The power source (100) comprises an excitation cavity (108) configured to generate an electromagnetic power mode (112), wherein the excitation cavity (108) comprises a first, inner, layer (122) thermally coupled to a second, outer, layer (124), wherein the first layer comprises electrically conducting metal and the second layer comprises diamond.

An insulative assembly (130) for a microwave vacuum tube (1204) comprising: an oil tank (1202) and at least one high temperature or high voltage component (1208) arranged in the oil tank. The oil tank (1202) has an internal groove (1210). The at least one high temperature or high voltage component is spaced apart from the internal groove within the oil tank; wherein the internal groove is configured to separate gas bubbles (1212) from the at least one high temperature or high voltage component within the oil tank during operation.

A gyrotron system (1) comprises a housing (2), an electron gun (3) configured to produce an electron beam, at least one magnet (4) configured to produce a magnetic field, and a cavity (5) configured to receive the electron beam, and wherein microwaves and / or Terahertz waves (16) are generatable in the cavity (5) by a resonance coupling between the electron beam and the magnetic field produced by the magnet (4). The magnet (4) is a superconducting magnet that is configured to exhibit superconductivity upon cooling below its critical temperature and that is arranged around the cavity (5), and the cavity (5) and the superconducting magnet (4) are arranged within the housing (2).

A coaxial window inner conductor cooling structure provided by the present invention comprises a coaxial window, the coaxial window comprises an annular window sheet, an outer conductor sealed on the outer peripheral surface of the window sheet and an inner conductor sealed on the inner peripheral surface of the window sheet, and the inner conductor comprises an inner cavity; the output waveguide is vertically communicated with the coaxial window; the waveguide coaxial conversion structure is connected with the inner conductor and the output waveguide; the waveguide coaxial conversion structure comprises a channel communicated with the inner cavity; the liquid cooling assembly comprises a matching piece arranged on the outer side of the output waveguide and a hollow liquid cooling pipe extending into the inner cavity in the axial direction of the coaxial window; the matching piece is provided with a liquid inlet and a liquid outlet; the output waveguide is provided with a communicating hole; one end of the liquid cooling pipe extends into the inner cavity and is provided with a liquid outlet hole communicated with the inner cavity, and the other end of the liquid cooling pipe penetrates through the channel and the communication hole and then extends into the matching piece to be communicated with the liquid inlet, so that the interior of the liquid cooling pipe, the inner cavity and the channel jointly form a cooling circulation path.

The magnetron of the present invention includes an anode cylinder, a plurality of vanes, a cathode filament, an input-side magnetic pole, an output-side magnetic pole, and a choke structure portion. The anode cylinder has an input-side opening portion and an output-side opening portion, and has a cylindrical shape. The plurality of vanes are radially arranged from the central axis of the anode cylinder to the inner wall surface of the anode cylinder. The cathode filament is arranged along the central axis of the anode cylinder. The input-side magnetic pole and the output-side magnetic pole are respectively arranged at the input-side opening portion and the output-side opening portion. The choke structure portion is arranged inside an opening formed in the input-side magnetic pole. The choke structure portion is formed without a seam and is arranged so as to cover the peripheral portion of the opening of the input-side magnetic pole with respect to the central axis of the anode cylinder.

The coaxial magnetron with the metamaterial loaded in the outer cavity comprises an anode blade set, an anode cylinder, a metamaterial layer and an outer cylinder which are sequentially arranged from inside to outside, the anode blade set is composed of a plurality of anode blades which are annularly and evenly arranged in an array mode, and a resonance inner cavity is formed between every two adjacent anode blades; the anode cylinder is arranged outside the anode blade group in a sleeving manner, a plurality of coupling gaps are formed in the cylinder wall of the anode cylinder, a coaxial outer cavity is formed between the anode cylinder and the outer cylinder, and the inner cavity and the outer cavity are connected and communicated through the coupling gaps; the metamaterial layer is arranged between the anode cylinder and the outer cylinder and is used for connecting the anode cylinder and the outer cylinder; the metamaterial layer is formed by arranging a plurality of metamaterial units in an annular array, and the metamaterial units are metal copper sheets with hollow dumbbell patterns. On the premise of ensuring the efficiency, the compactness of the coaxial magnetron is improved, the competition mode of the coaxial magnetron is inhibited, and the anode heat dissipation performance of the coaxial magnetron is enhanced.

A magnetron and a microwave heating device. The magnetron comprises a tube core (21), a first tube housing (21a), a second tube housing (21b), output ceramic (22), an antenna cap (23), and an antenna (24). The first tube housing (21a), the tube core (21), the second tube housing (21b), the output ceramic (22) and the antenna cap (23) are connected in sequence. The antenna (24) extends into the tube core (21), and sequentially passes through the second tube housing (21b) and the output ceramic (22) and then extends into the antenna cap (23). The height H1 of the second tube housing (21b) relative to the tube core (21) is not greater than 14 millimeters, and the ratio H1 / S of the height H1 of the tube core (21) to the cross-sectional area S of the antenna (24) is within the range of 0.4 to 3.3.

The invention relates to the technical field of microwave vacuum electronic devices, and discloses a Ka-frequency-band 500W high-efficiency and light-weight conduction type space traveling wave tube which comprises a bottom plate, an electron gun body, an interaction structure, a collector body, an input energy transmission system and an output energy transmission system, and the electron gun body, the interaction structure, the collector body and the input energy transmission system are installed on the bottom plate. A frame-type support is arranged in the middle of the bottom plate to enhance supporting. In the interaction structure, the clamping rods are distributed in a delta shape and are in cambered surface contact with the spiral line, and the contact thermal resistance is reduced in cooperation with the thread pitch jump design of the spiral line; the output energy transmission system is of a box-shaped window structure, an output inner conductor of the output energy transmission system is made of annealed oxygen-free copper with a hole in the center, the end of the output inner conductor is designed to be small in outer diameter, thermal stress is released, and the risk of cracking between the output inner conductor and an output antenna is avoided. And the collector body is internally provided with a plurality of stages of voltage reduction electrodes for recovering energy. By optimizing the heat dissipation path and the structural stress design, the problems of heat dissipation bottleneck and window failure of the high-power traveling wave tube are solved, and the reliability and the output power of the device are improved.

The application discloses a coaxial-circular waveguide output structure of a coaxial gyrotron traveling wave tube, and relates to the field of microwave and millimeter wave passive devices. The structure comprises a coaxial outer conductor, a coaxial inner conductor and a support structure arranged between the coaxial outer conductor and the coaxial inner conductor. The support structure comprises a plurality of circumferentially distributed support units. The width of the support units increases first and then decreases along the axial direction. The middle sections of adjacent support units are rectangular waveguide cavities. The coaxial inner conductor is provided with two cavities which are connected at two ends. The coaxial inner conductor, the support units and the coaxial outer conductor are provided with through holes which are used for injecting cooling liquid into one cavity and making the cooling liquid flow out of the other cavity. The application solves the support problem of the output part of the coaxial gyrotron traveling wave tube by using the support structure, and has the advantages of wide band and high mode conversion efficiency. In addition, the through holes and the cavity structure are arranged to realize the cooling of the output part of the coaxial gyrotron traveling wave tube.

The present invention discloses an efficient magnetron, which includes an anode cylinder assembly, a cathode assembly, a magnetic pole assembly, an antenna assembly, a lead structure, a filter box and a heat sink. The anode cylinder assembly includes an anode cylinder and a plurality of anode plates, and the anode plates are evenly spaced on the inner side wall of the anode cylinder to form a resonant system; both ends of the anode cylinder are sealed and supported by strontium ferrite and magnetic pole plates respectively; the filament of the cathode assembly is supported by two rods to the center position of the anode diameter, and the other ends of the rods are connected to the filter box through the lead structure, and the antenna assembly is arranged at the other end of the anode assembly; the heat sink is evenly fixed on the outer side surface of the anode cylinder. The present invention optimizes the matching values of each part, enables the magnetron to have better performance parameters, can efficiently convert electrical energy into microwave energy, and can be efficiently coupled to the load; adopts a new type of lead structure, and no additional fixture is required for positioning during welding, reducing the use of the magnetron processing positioning tooling, and improving the production efficiency and product quality.