754results about "X-ray tube electrodes" patented technology

The invention provides an enhanced heat conduction lubrication type ball bearing for an X-ray tube and a CT bulb tube. The enhanced heat conduction lubrication type ball bearing comprises a bearing sleeve, a sealing end cover, a bearing raceway, a fixing shaft, a sealing baffle and a ball. A bearing cavity for accommodating the bearing raceway is formed in the bearing sleeve, the bearing cavity is filled with liquid metal, gaps among the bearing raceway, the balls and the fixed shaft are filled with the liquid metal, and the fixed shaft is filled with a flowing heat dissipation medium; the two ends of the bearing sleeve are a closed end and an open end respectively, a sealing step is arranged at the open end, movable sealing grooves are formed in the end face of the sealing step and the end face of the sealing end cover, each movable sealing groove comprises two flow channels intersecting at an acute angle, and a sealing groove and a backflow hole communicated with the movable sealing grooves and the sealing groove are formed in the sealing end cover. The anode assembly has good lubricity, heat dissipation capacity and conductivity, the operation stability is improved, the service life is prolonged, and the heat dissipation power of the anode assembly is greatly improved.

An X-ray bulb tube adopting a liquid metal bearing comprises a shell defining a containing cavity, and the shell is provided with a first side and a second side which are opposite in the first direction; the anode target is arranged in the accommodating cavity; the middle shaft part extends in the first direction and is provided with a first end and a second end which are opposite; the outer shaft part is arranged on the first matching section of the middle shaft part in a sleeving mode and can rotate with the middle shaft part as the axis, the second end is located on the first matching section, a non-zero first gap is formed between the inner wall of the outer shaft part and the peripheral face of the first matching section, the first gap forms at least one part of a filling cavity, and the filling cavity is filled with liquid metal; the first matching section, the outer shaft part and the liquid metal in the filling cavity are matched to form a liquid metal bearing; the middle shaft part is sleeved with the supporting part, the supporting part is fixedly connected with the outer shaft part and synchronously rotates along with the outer shaft part, and at least one part of the supporting part selectively abuts against the middle shaft part along with the rotating speed of the outer shaft part. Therefore, the X-ray bulb tube is lower in abrasion and longer in service life.

A planar filament for an x-ray tube can have a different cross-sectional area at different locations. In regions of smaller cross-sectional area, there can be higher current density, and thus increased heating and higher temperature of the wire. In regions of larger cross-sectional area, there can be lower current density, and thus decreased heating of the wire. Regions of larger cross-sectional area can also be stronger, thus reducing early filament failures. Wider regions can have increased area for electron emission. By adjusting the cross-sectional area and width of the wire at different locations, electron emission can be largely confined to a center of the filament, and filament life can increase.

An anode assembly for an X-ray tube and an X-ray tube wherein the anode assembly for an X-ray tube comprises: an anode target having a bombardment surface for receiving an electron beam emitted in a first direction to generate an X-ray; and the first nano-structure layer at least covers the bombardment surface, and the first nano-structure layer is used for absorbing the first electrons on the bombardment surface. According to the technical scheme, the service life of the X-ray tube can be prolonged, and the working efficiency of the X-ray tube is improved.

A planar filament for an x-ray tube can have a different cross-sectional area at different locations. In regions of smaller cross-sectional area, there can be higher current density, and thus increased heating and higher temperature of the wire. In regions of larger cross-sectional area, there can be lower current density, and thus decreased heating of the wire. Regions of larger cross-sectional area can also be stronger, thus reducing early filament failures. Wider regions can have increased area for electron emission. By adjusting the cross-sectional area and width of the wire at different locations, electron emission can be largely confined to a center of the filament, and filament life can increase.

The embodiment of the invention discloses a cold cathode flat plate X-ray source capable of coding light emitting and a coding light emitting method, the ray source comprises a vacuum sealing cavity, a cathode assembly and an anode assembly, the cathode assembly and the anode assembly are arranged in the vacuum sealing cavity in a sealing manner, and the cathode assembly and the anode assembly are oppositely arranged at an interval; a vacuum working space for electron acceleration and X-ray generation is formed; the cathode assembly comprises a cathode substrate and a nano cold cathode electron source array arranged on the cathode substrate; the anode assembly comprises an anode substrate and a transmission anode target arranged on the anode substrate; wherein at least one of the nanometer cold cathode electron source array and the transmission anode target is in a coding state: when the nanometer cold cathode electron source array is in the coding state, the nanometer cold cathode electron source array comprises a micro-unit electron source array capable of independently addressing, and a preset coding pattern is formed; and when the transmission anode target is in a coding state, a metal coating with a preset coding pattern is formed on the surface of the anode substrate through a micromachining process so as to integrate a coding function.

An electron beam size measuring device (100) and measuring method. The electron beam size measuring device (100) comprises an electron beam source (110), an anode target (120), a driving device (140), and a detection device (130). The electron beam source (110) is used for emitting an electron beam. The anode target (120) comprises a bombardment surface (121) for receiving the electron beam, and the bombardment surface (121) comprises a first material surface (1211) and a second material surface (1212) arranged side by side. The driving device (140) is connected to the electron beam source (110) and / or the anode target (120) and is used for driving the electron beam source (110) and / or the anode target (120) to make relative movement, so that the electron beam scans the first material surface (1211) and the second material surface (1212). The detection device (130) is used for detecting a signal generated after the bombardment surface (121) is bombarded by the electron beam, and the signal is used for determining the size of the electron beam.

The utility model provides an X-ray tube cathode assembly tool and an X-ray tube, the tool at least comprises a filament welding tool, the filament welding tool is used for positioning a ceramic assembly and a filament assembly of a cathode assembly, and the filament assembly completes a preassembly process with the ceramic assembly on the filament welding tool; the lamp filament welding tool comprises a welding base, the welding base is provided with a first containing cavity concaved downwards from the surface of the welding base and an isolation part protruding from the surface of the welding base, the first containing cavity is used for containing and positioning a ceramic assembly, a groove is formed in the isolation part, and the groove is consistent with the lamp filament preassembly position of a lamp filament assembly. By adopting the assembly tool, the assembly position of the lamp filament can be accurately controlled, the concentricity of the lamp filament and the cathode focusing hole is ensured, the efficient assembly and welding of the cathode assembly are realized, the lamp filament assembly time is greatly shortened, and the production efficiency and the product performance are improved.

The utility model relates to the technical field of X-ray tubes, in particular to an X-ray tube with high-stability luminous flux, which comprises a tube shell, a cathode assembly, an anode assembly and a window assembly, and is characterized in that the anode assembly comprises an anode cap, an anode rod and an anode target assembly; the anode cap comprises an expansion part, a partition part and a necking part which are sequentially connected in the axial direction of the anode cap, the expansion part wraps the focusing piece from the bottom and the circumferential direction of the focusing piece, an electron beam incidence hole is formed in the partition part, and a packaging cavity extending in the axial direction and an X-ray outlet penetrating in the radial direction are formed in the necking part; the potential of the anode assembly is higher than that of the cathode assembly; along the axial direction of the X-ray tube, the distance H between the bottom of the focusing part and the top of the expansion part is greater than the distance D1 between the bottom of the focusing part and the partition part, so that stray electrons and secondary electrons generated by the stray electrons and overflow electrons and secondary electrons generated by the overflow electrons are absorbed after repeated back bombardment in the expansion part, and the secondary electrons are completely prevented from bombarding a tube shell, thereby improving the efficiency of the X-ray tube. And the high stability of the X-ray luminous flux is ensured.

X-ray generation apparatus includes: X-ray generation tube, cathode having electron emitting portion, and anode having target; driving circuit for driving the X-ray generation tube, and accommodating container accommodating the X-ray generation tube and the driving circuit. The accommodating container defines first space storing the driving circuit, and second space protruding from the first space and storing at least part of the X-ray generation tube, the accommodating container includes protrusion portion surrounding the second space. The second space includes third space where X-rays from the target enter without being blocked by either the cathode or the anode, and fourth space where X-rays from the target are blocked by the cathode or the anode.

The utility model relates to a liquid metal bearing with a backflow channel. The liquid metal bearing comprises a shaft and a rotating assembly, a gap between the shaft and the rotating assembly is filled with liquid metal; the shaft comprises a shaft body and a shaft bulge annularly arranged on the shaft body; the rotating assembly comprises a shaft sleeve arranged at one end of the shaft body in a sleeving mode, a sealing partition plate arranged at one end of the shaft sleeve and a sealing flange arranged on one side of the sealing partition plate. The shaft sleeve and the sealing flange abut against the shaft protrusion, and the outer side of the shaft protrusion is sleeved with the sealing partition plate. A liquid storage groove communicated with the gap is formed in the inner surface of the sealing flange; a spiral backflow channel is arranged in the sealing flange or on the outer surface, close to the liquid storage tank, of the shaft body, and the spiral backflow channel is communicated with the liquid storage tank and the gap. The utility model also relates to an X-ray tube. According to the X-ray tube, leakage of liquid metal can be avoided, and the reliability of the X-ray tube is effectively improved.

The invention relates to an electron source, a preparation method of the electron source, an electron gun and application of the electron source. The electron source comprises an optical fiber and an electron emission layer, the optical fiber comprises a fiber core used for transmitting laser and a wrapping layer wrapping the fiber core, and the end face of the light outlet end of the optical fiber and the extending direction of the fiber core are arranged at an angle. The electron emission layer is arranged on the end face of the light emitting end of the optical fiber, and the electron emission layer at least comprises an electron excitation layer covering the fiber core. The electron excitation layer comprises at least one of a zero-dimensional material, a one-dimensional material and a two-dimensional material. Low-dimensional materials such as zero-dimensional materials, one-dimensional materials or two-dimensional materials are adopted as materials of the electron excitation layer, the low-dimensional materials have the atomic-scale thickness, back-incident electrons can be emitted without in-vivo transmission, and the electron emission efficiency is high; and the low-dimensional material has the characteristics of no dangling bond, stable property, high melting point, difficulty in damage, good stability, long service life and the like.

The present invention discloses an X-ray tube with an anode forced cooling structure and a cooling pipeline structure, which includes a cathode, a tube shell, an anode, a radiator, and a cooling pipeline. The anode includes an anode cap, an anode target, a target head, and a target body. One end of the main pipeline of the cooling pipeline is communicated with the inlet end of the outlet fixed end plate. There are multiple sub-pipelines, and the end of the target head is provided with bottom holes consistent with the number and arrangement of the sub-pipelines. One end of each sub-pipeline is communicated with the main pipeline, and the other end is correspondingly inserted into the bottom holes at the corresponding positions. The outlet fixed end plate is provided with a number of outlet end through holes. The outlet fixed end plate is fixed to the outer end face of the radiator, and the outer end face of the radiator is provided with a through hole with a diameter larger than the diameter of the inner cavity of the target body and communicated with the inner cavity of the target body, and the position of the through hole corresponds to the position of the outlet end through hole. The present invention can greatly improve the heat dissipation efficiency, ensure that the working temperature is very effectively reduced when the power is increased, and ensure the stability of long-term continuous operation.

The utility model discloses a longitudinally-split modulated graphene quasi-three-dimensional soaking high-thermal-conductivity X-ray target and a ray tube. The X-ray target comprises a heat dissipation base body, a target arranged on the surface of the heat dissipation base body and a two-dimensional graphene vapor chamber used for in-plane two-dimensional heat conduction, the two-dimensional graphene vapor chamber is arranged on the surface of the heat dissipation base body and located below the target, and a longitudinal heat conductor which extends in the longitudinal direction and is used for longitudinal heat conduction is arranged in the two-dimensional graphene vapor chamber. By adopting the longitudinally-split modulated graphene quasi-three-dimensional soaking high-thermal-conductivity X-ray target as an X-ray target substrate, longitudinal high thermal conductivity can be realized, and the heat dissipation capability of the target substrate is improved from two-dimensional soaking to quasi-three-dimensional soaking.

The invention relates to a micro-focus CT bulb tube based on a laser trigger cathode and quadrupole magnetic focusing and a working method of the micro-focus CT bulb tube, which are applied to the technical field of CT bulb tubes and comprise a vacuum tube shell, a gallium nitride cathode system arranged in the vacuum tube shell, a laser trigger system, a quadrupole magnetic focusing system, a rotating target structure and a ray window, by adopting the gallium nitride annular cathode film and the laser trigger system, an electron emission mechanism with low power consumption and high response rate is realized; by arranging a quadrupole magnetic focusing structure, the focus position and size of the electron beam are effectively controlled; the rotary tungsten-rhenium target disc is used for enhancing the thermal load bearing capacity and improving the X-ray yield; the high vacuum environment and the dynamic thermal modeling feedback strategy are combined, the technical problems of a traditional micro-focus CT bulb tube in response speed, focus stability and thermal management are solved, the imaging resolution and the system reliability are remarkably improved, and the method is suitable for the field of high-precision medical and industrial nondestructive testing.

The invention relates to a field effect emitter microstructure, an electron emitter device, an X-ray tube and a method for generating X-rays by means of an X-ray tube. The field effect emitter microstructure comprises an emitter needle, a gate electrode with a gate opening, the gate opening connects the lower side and the upper side of the gate electrode, and the longitudinal central axis of the emitter needle is vertical to the gate electrode in the emission direction and is aligned with the gate opening; a first insulating layer in which free electrons can be generated by means of an emission voltage that can be applied between the gate electrode and the field-effect emission section, the field-effect emitter microstructure being characterized in that a second insulating layer, the lower side of which adjoins the upper side of the gate electrode at least in part, is provided, and an electrically conductive focusing layer, the focusing layer being provided in which the free electrons can be generated in the field-effect emission section by means of an emission voltage that can be applied between the gate electrode and the field-effect emission section. The upper side of the second insulating layer is at least partially adjacent to the lower side of the focusing layer, and the second insulating layer and the focusing layer each have a through-opening for free electrons that can be generated in the field-effect emission section.

The liquid metal bearing for the CT bulb tube comprises a shaft body, a sleeve body and liquid metal, the sleeve body comprises a shaft sleeve, an annular end cover and a sealing sleeve, the shaft body is sequentially provided with an outer section, an annular boss section and an inner section, and molybdenum coatings are arranged on the surface of the inner section and the inner surface of the shaft sleeve respectively. According to the liquid metal bearing for the CT bulb tube, the wettability of the molybdenum coating and liquid metal in the bearing is good, the lubricity of the bearing in the rotating process can be guaranteed, a base material of the bearing can be made of materials such as titanium-aluminum alloy or austenitic stainless steel with lower cost, and the cost is lower; by arranging the anti-wetting coating, the effect of containing the liquid metal is achieved, and therefore leakage of the liquid metal between different fixed parts and at the interface between the fixed part and the rotatable part is prevented.

The invention belongs to the technical field of bearings, and particularly relates to a method for sealing a liquid metal bearing through a spiral labyrinth. A CT bulb tube needs to work with high precision and stable operation, a traditional ball bearing has many defects when used in the CT bulb tube, and although a liquid metal bearing has advantages, a traditional sealing structure is difficult to meet the sealing and liquid metal flow guiding requirements of the CT bulb tube. In order to solve the problems, the bearing is mainly composed of a core shaft, a shaft sleeve, a labyrinth sealing structure and liquid metal, the core is the spiral labyrinth sealing structure, sealing teeth of the spiral labyrinth sealing structure are spiral and form a roundabout channel, and a tiny sealing gap is formed between the sealing teeth and the core shaft. In the working process, leakage is reduced by means of the throttling effect and liquid metal surface tension, and liquid metal is guided to flow reversely. Liquid metal leakage can be effectively reduced, stable rotation of the bulb tube is guaranteed, the imaging quality is improved, the equipment maintenance cost and the failure rate are reduced, powerful technical support is provided for improvement of the performance of the CT bulb tube, and the application prospect is good.

The utility model relates to an X-ray tube anode target disc fixing structure which comprises a rotor, and an anode target disc, a fixing nut, an anti-loose gasket and a locking cover are sequentially installed on the rotor. The locking cover tightly presses the anti-loose gasket, so that the anti-loose gasket generates elastic deformation between the fixing nut and the locking cover; the anti-loose gasket is a wave-shaped gasket; an anti-rotation structure is arranged between the rotor and the anode target disc, the anti-loose gasket is provided with 4-6 waveforms and is made of molybdenum alloy or tungsten alloy, and the rotor is in clearance fit with the anode target disc. The utility model has the advantages of high reliability, long service life and low assembly requirement, eliminates the gas retention risk of the internal closed cavity, and realizes the directional dredging of the gas by establishing a communication channel between the cavity and the external high vacuum environment.

A method for reducing electron emission of an electron emitter comprises: emitting electrons from a first current path via at least one first field effect emitter element, subject to an emission voltage between a gate electrode and an emission surface; determining a property of the first current path; and activating a first current limiting unit subject to the properties of the first current path to reduce the electron emission of the electron emitter.

An X-ray target (10) comprising: a thermally conductive substrate (20) having a surface (22); and a plurality of structures (30) which are separated from one another, on or embedded in at least a portion of the surface (22), each of the at least two structures (30) of the plurality of structures (30) comprising: a thermally conductive first material (32) in thermal communication with the substrate (20), and at least one layer (40) over the first material (32), wherein the at least one layer (40) comprises at least one second material (42) that is different from the first material (32), wherein the at least one second material (42) is configured to generate X-rays when irradiated by electrons, wherein the first materials (32) of the at least two structures (30) are separated from each other and the at least one second material (42) of the at least two structures (30) are separated from each other and different from each other, and wherein the at least one layer (40) further comprises at least one third material (44) between the first material (32) and the at least one second material (42), wherein the at least one third material (44) is different from the first material (32) and the at least one second material (42), and the at least one third material (44) has a thickness between 2 nanometers and 50 nanometers and / or the at least one third material (44) comprises at least one of the following materials: titanium nitride, iridium, chromium, beryllium and hafnium oxide.

The utility model relates to a liquid metal bearing which comprises a shaft and a rotating component, a gap is formed between the shaft and the rotating assembly; the shaft comprises a shaft body and a shaft bulge annularly arranged on the shaft body, and the rotating assembly can rotate around the shaft body; in the axial direction of the shaft body, the gap comprises a bearing carrying area, a thrust sealing area and a leakage restraining area which are sequentially communicated. The bearing carrying area and the thrust sealing area are both filled with liquid metal. A herringbone groove is formed in the surface, close to the bearing carrying area, of the shaft body. And at least one high-pressure introduction channel is arranged at one end, close to the herringbone groove, of the shaft body. The utility model also relates to an X-ray tube. Through the structure, the gap of the thrust sealing area can be reduced, liquid metal is prevented from leaking through the gap, and the reliability of the X-ray tube is effectively improved. The structure has high practicability and economical efficiency, and can be produced and used as a general product.

A system includes a stage for supporting a sample having at least first and second atomic elements. The first atomic element has a first characteristic x-ray line with a first energy and the second atomic element has a second characteristic x-ray line with a second energy, the first and second energies lower than 8 keV and separated from one another by less than 1 keV. The system further includes an x-ray source of x-rays having a third energy between the first and second energies and at least one x-ray optic configured to receive and focus at least some of the x-rays as an x-ray beam to illuminate the sample. The system further includes at least one x-ray detector configured to detect fluorescence x-rays produced by the sample in response to being irradiated by the x-ray beam.

Provided is an emitter. The emitter according to an aspect of the present disclosure is formed in a form of a sheet including carbon nanotube, and the emitter includes at least one of a part curved to form a ridge in a direction of electron emission and a part bent to form a ridge in the direction of electron emission.

An anode for an X-ray tube is provided to reduce the incidence of off-focus x-ray emissions from the anode. The anode has a rotating component, a body operably connected to the rotating component and adapted to rotate in conjunction with the rotating component, and at least one emissive material track defined on the body wherein the at least one emissive material track has a first width, and wherein the first width is less than or equal to twice a second width of a focal spot track on the body. Further, to enhance the reduction in the off-focus x-ray emission, the emissive material track is formed of a material having a first atomic number and the body is formed of a material having a second atomic number with a ratio of the first atomic number to the second atomic number being at least 6.

The present invention provides a multi-directional connection hub including a plurality of openings to which an anode adapter made of a metal material is connected through an insulation tube and an electron gun which emits electrons to the anode adapter to generate X-rays is connected, wherein the openings include a plurality of side openings to which the electron gun is connected and an upper opening through which the X-rays generated by the electrons, which are provided from the electron gun through the side opening and collide with the anode adapter, are emitted, and an emission direction of the X-rays is changed toward another side opening of the plurality of side openings or the upper opening according to a type of the anode adapter and a type or installation location of the electron gun.

The invention provides a hot cathode for a micro-focus X-ray tube and the X-ray tube, the hot cathode comprises a cathode body, a cathode cylinder, potting ceramic, a heater, a sealing cover, a heat insulation straight cylinder, a heat insulation conical cylinder and heat insulation ceramic, the outer side wall of the cathode cylinder is sequentially provided with a first step part and a second step part, the heat insulation straight cylinder is connected with the cathode cylinder through the first step part, and the heat insulation conical cylinder is connected with the cathode cylinder through the second step part; the heat-insulating conical cylinder is located on the periphery of the heat-insulating straight cylinder, the bottom of the heat-insulating conical cylinder is connected with the heat-insulating straight cylinder, and the heat-insulating ceramic is connected to the top of the heat-insulating conical cylinder. Through the structural cooperation of the heat insulation straight cylinder, the heat insulation conical cylinder and the heat insulation ceramic, the heat flow path is prolonged and bent, and the radial heat resistance is effectively improved; through the design of the conical heat insulation cylinder, the heat flow sectional area changes in the axial direction, the heat flow density redistribution effect is generated, the heat flow density of the high-temperature end is reduced, the conical cylinder is matched with the straight cylinder to form a heat flow impedance matching structure, and heat reflection loss is reduced.

The present invention relates to the technical field of X-ray tubes. Provided are an X-ray tube with a liquid-cooled anode, and an X-ray source. The X-ray tube with liquid-cooled anode comprises: a tube housing; a cathode assembly, which is arranged in a tube cavity; an anode assembly, which comprises an anode end cap, an anode head, and an anode target; and a liquid cooling system, which comprises a liquid cooling cover, a cooling liquid intake flow channel, a cooling liquid output flow channel, a temperature measuring device, and a window sealing flange, wherein the cooling liquid intake flow channel and the cooling liquid output flow channel are both in communication with a cover cavity of the liquid cooling cover; a liquid output end of the cooling liquid intake flow channel is suspended in a liquid cooling blind hole; and the inner surface of the liquid cooling cover, the outer surface of the window sealing flange and the outer surface of an end cap body jointly define a liquid cooling cavity for containing a cooling medium. The present invention enables X-ray optics to collect and focus X-rays generated by the anode target to the greatest extent, and can dissipate heat from the anode assembly in a more comprehensive manner, thereby effectively preventing the spatial position of a focal spot on the anode target from drifting.

The invention relates to the technical field of X-ray tube manufacturing, in particular to an X-ray tube shell, a manufacturing method and an X-ray tube, the X-ray tube shell comprises a shell used for containing an anode target disc, a heat dissipation layer is attached to the inner wall of the shell, and the heat dissipation layer at least surrounds the periphery of the anode target disc; the heat dissipation layer is of an interpenetrating network structure formed by compounding functional metal and diamond, and the material of the functional metal at least comprises one of molybdenum and tungsten. Based on the device, the shell can absorb thermal radiation energy by using the high absorption characteristic of molybdenum or tungsten in an infrared band, and can quickly conduct heat out by means of the high thermal conductivity of diamond, so that the heat dissipation efficiency of the shell is improved, and heat accumulation is effectively prevented.