Radiation emitting device

Abstract

A radiation emitting device (100, 200, 800) is provided. The radiation emitting device (100, 200, 800) may include a cathode (126) configured to emit an electron beam and an anode (122, 230) configured to rotate on an axis (112, 220). The anode (122, 230) may be configured to receive the electron beam from the cathode (126). The radiation emitting device (100, 200, 800) may further include a rotor (120) configured to drive the anode (122, 230) to rotate. The rotor (120) may be mechanically connected to the axis (112, 220). The radiation emitting device (100, 200, 800) may further include a conical stator and a coil mounted on the conical stator. The magnetic field generated by the coil drives the rotor to rotate, and the magnetic field is inclined relative to the axial direction of the axis. The radiation emitting device may further include a sleeve (110, 236, 812) supporting the shaft (112, 220) via at least one bearing (114, 234). The cathode (126), the anode (122, 230), and the rotor (120) may be sealed in a housing (124, 810) connected to the sleeve (110, 236, 812).

Description

[0001] Description of the case

[0002] This application is a divisional application filed for the Chinese application with the application date of August 31, 2017, application number 201780094443.3, and invention name “Radiation Emitting Device”. Technical Field

[0003] The present application generally relates to a radiation emitting device, and more particularly to a CT device having a heat dissipation structure. Background Art

[0004] In radiology, electrons can be generated at one end of a cathode and accelerated toward an anode. When the electrons strike the anode, radioactive radiation (e.g., X-rays) can be produced. The anode can rotate on a shaft mounted on a sleeve via bearings. Significant amounts of heat can be transferred from the anode to the bearings, for example, via the shaft or thermal radiation. Excessive heat can negatively impact the bearings and shorten their service life. Therefore, it would be desirable to provide an effective method for dissipating heat in the bearings. Summary of the Invention

[0005] According to some embodiments of the disclosed content, a radiation emitting device having a heat dissipation structure is provided.

[0006] One aspect of the present application relates to a radiation emitting device. The radiation emitting device may include a cathode configured to emit an electron beam and an anode configured to rotate on an axis. The anode is configured to receive the electron beam. The radiation emitting device further includes a rotor configured to drive the anode to rotate. The rotor is mechanically connected to the axis. The radiation emitting device further includes a conical stator and a coil mounted on the conical stator, the magnetic field generated by the coil driving the rotor to rotate, and the magnetic field is inclined relative to the axial direction of the axis. The radiation emitting device also includes a sleeve configured to support the axis via at least one bearing. The radiation emitting device also includes a housing that can seal the cathode, the anode, and the rotor.

[0007] In some embodiments, the housing is coupled to the sleeve, at least a portion of the sleeve is located outside the housing, and both the housing and the sleeve are immersed in a first cooling medium.

[0008] In some embodiments, the rotor is located between the anode and the sleeve, and the rotor and the sleeve are arranged side by side along the axial direction of the shaft.

[0009] In some embodiments, the rotor is located between the anode and the at least one bearing.

[0010] In some embodiments, the rotor is connected to the shaft by at least one flange, and one or more of the at least one flange is configured to support the anode.

[0011] In some embodiments, an inclination angle of the magnetic field relative to the axial direction of the shaft is in a range of 10 degrees to 80 degrees.

[0012] In some embodiments, the at least one bearing includes two bearings. The two bearings each have an inner ring and an outer ring. The inner ring is connected to the inner ring, and the outer ring is connected to the outer ring. The spacing between the inner ring and the outer ring is adjustable via an adjustment ring.

[0013] In some embodiments, a first side of the adjustment ring is mounted on the sleeve, and a second side of the adjustment ring is mounted on the inner ring.

[0014] In some embodiments, the at least one bearing abuts a retaining ring, and at least a portion of the retaining ring cooperates with the sleeve to restrict axial movement of the at least one bearing along the shaft.

[0015] In some embodiments, the at least one bearing is adjacent to a spring on one side of the at least one bearing. The spring applies compressive stress to the at least one bearing along the axial direction of the shaft.

[0016] Some additional features of the present application are described in the following description. Some additional features of the present application will be apparent to those skilled in the art from a study of the following description and accompanying drawings, or from understanding the production or operation of the embodiments. The features of the present application can be realized and achieved through practice or use of the methods, means, and combinations of various aspects of the specific embodiments described below. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present application will be further described by way of exemplary embodiments. These exemplary embodiments will be described in detail with reference to the accompanying drawings. These embodiments are non-limiting examples, wherein the same reference numerals denote similar structures throughout the accompanying drawings, wherein:

[0018] Figure 1 is a cross-sectional view of an exemplary radiation emitting device according to some embodiments of the present application;

[0019] Figure 2 is a partially enlarged view of a radiation emitting device according to some embodiments of the present application;

[0020] Figure 3 is a partially enlarged view of a radiation emitting device according to some embodiments of the present application;

[0021] Figure 4is a cross-sectional view of an exemplary radiation emitting device according to some embodiments of the present application;

[0022] Figure 5 is a partially enlarged view of a radiation emitting device according to some embodiments of the present application;

[0023] Figure 6 is a partial cross-sectional view of an axially oriented launch device according to some embodiments of the present application;

[0024] Figure 7 is a cross-sectional view of a portion of a radiation emitting device and exemplary fluid communication within a shaft according to some embodiments of the present application;

[0025] Figure 8 is a perspective view of an exemplary radiation emitting device according to some embodiments of the present application;

[0026] Figure 9 is a cross-sectional view of an exemplary outer surface of a housing according to some embodiments of the present application; and

[0027] Figure 10 is a cross-sectional view of an exemplary outer surface of a sleeve according to some embodiments of the present application. DETAILED DESCRIPTION

[0028] In order to more clearly illustrate the technical solutions of the embodiments of the present application, a brief introduction to the drawings required for use in the description of the embodiments will be given below. However, it should be understood by those skilled in the art that the present application can be implemented without these details. In other cases, in order to avoid unnecessarily obscuring some aspects of the present application, the present application has briefly described well-known methods, procedures, systems, components and / or circuits at a relatively high level. It is obvious to those skilled in the art that various changes can be made to the disclosed embodiments, and the general principles defined in the present application can be applied to other embodiments and application scenarios without departing from the principles and scope of the present application. Therefore, the present application is not limited to the embodiments shown, but conforms to the broadest scope consistent with the scope of the patent application.

[0029] It should be understood that the terms "system," "unit," "module," and / or "block" used herein are methods for distinguishing different components, elements, parts, portions, or assemblies at different levels in ascending order. However, other expressions that achieve the same purpose may be used to replace the above terms.

[0030] It should be understood that when a unit, module or block is referred to as being "on," "connected" or "coupled to" another unit, module or block, it can be directly on, connected or coupled to the other unit, module or block, or intervening units, modules or blocks may be present, unless the context clearly indicates otherwise. In this application, the term "and / or" may include any one or more of the relevant listed items or any combination thereof.

[0031] The terms used herein are for the purpose of describing specific examples and embodiments only and are not intended to be limiting. As used herein, the singular forms "a", "an" and "the" may also include the plural forms, unless the context clearly indicates an exception. It should also be understood that the terms "include" and / or "comprise" in this application only specify the presence of an entity, device, behavior, stated features, steps, elements, operations and / or parts, but do not exclude the presence or addition of one or more other entities, devices, behaviors, features, steps, elements, operations, parts and / or combinations thereof.

[0032] Figure 1 is a cross-sectional view of an exemplary radiation emitting device according to some embodiments of the present application. It should be noted that the radiation emitting device described below is for illustrative purposes only and is not intended to limit the scope of this application. The radiation emitting device can be applied to various fields, such as the healthcare industry (e.g., medical applications), security applications, industrial applications, and the like. For example, the radiation emitting device 100 can generate X-rays for internal component inspection, such as defect detection, security scanning, failure analysis, metrology, assembly analysis, gap analysis, wall thickness analysis, and the like, or a combination thereof. The radiation emitting device 100 can be implemented in a computed tomography (CT) system, a digital radiography (DR) system, a computed radiography (CR) system, a multimodal system, and the like, or a combination thereof. Exemplary multimodal systems may include a computed tomography-positron emission tomography (CT-PET) scanner, a computed tomography-magnetic resonance imaging (CT-MRI) scanner, and the like. The radiation emitting device 100 can generate a radiation beam and emit the radiation beam toward an object (e.g., a human body). The radiation beam can include photon rays. The photon rays can include X-rays, gamma rays, ultraviolet rays, lasers, and the like, or a combination thereof.

[0033] The radiation emitting device 100 may include a sleeve 110 , a shaft 112 , at least one bearing 114 , a tapered stator 116 , a rotor flange 118 , a rotor 120 , an anode 122 , a housing 124 , and a cathode 126 .

[0034] The anode 122 may face the cathode 126. When power is supplied to the cathode 126, electrons are generated from the cathode 126 under the influence of the electric field between the cathode 126 and the anode 122, and are accelerated toward the anode 122. When the electrons impact the anode 122, the anode 122 may emit X-rays. During the generation of X-rays, the anode 122 may rotate about its axis so that the heat generated by the electrons impacting the anode 122 is distributed to different areas of the anode 122, thereby reducing or preventing localized overheating. As shown in the figure, the anode 122 may be mounted on the rotor flange 118. The rotor flange 118 may be mechanically connected to the rotor 120. The rotor 120 may be driven to rotate by the conical stator 116. The rotation of the rotor 120 may further drive the rotation of the anode 122. The assembly formed by the anode 122, rotor flange 118, and rotor 120 may be supported by the shaft 112. For example, the shaft 112 may be mechanically connected to the rotor flange 118 via a shaft flange. In some embodiments, the shaft flange and the rotor flange 118 may be secured together by, for example, a bolted arrangement.

[0035] The sleeve 110 can support the shaft 112. The sleeve 110 can limit the movement of the shaft 112 along the axial direction of the shaft 112 and allow the shaft 112 to rotate about its axis. In addition, the sleeve 110 can limit the movement of the shaft 112 along the direction perpendicular to the axial direction of the shaft 112 via, for example, at least one bearing 114. Detailed information about the connection between the at least one bearing 114, the shaft 112, and the sleeve 110 can be found elsewhere in this application, for example, see Figure 4 and its description.

[0036] Housing 124 can seal rotor flange 118, rotor 120, anode 122, and cathode 126. A vacuum state inside housing 124 can be maintained by sealed or airtight housing 124. In some embodiments, housing 124 can be made of glass, ceramic, cermet, or the like.

[0037] The shell 124 and the sleeve 110 can form structural integrity in different ways. For example, the shell 124 can be connected to the sleeve 110 by welding, mechanical elements, etc., or a combination thereof. Exemplary welding methods can include shielded metal arc welding (SMAW), metal active gas welding (MAGW), metal inert gas welding (MIGW), gas tungsten arc welding (GTAW), resistance welding, etc., or a combination thereof. Exemplary mechanical elements can include bolts, screws, nuts, washers, airtight glue, airtight tape, etc. In some embodiments, the first end of the sleeve 110 and one end of the shell 124 can be welded together. The second end of the sleeve 110 opposite to the first end can be located outside the shell 124.

[0038] Both the shell 124 and the sleeve 110 can be immersed in a first cooling medium. The first cooling medium may include a gas medium, a liquid medium, etc. Exemplary gas media may include air, an inert gas, etc., or any combination thereof. Exemplary liquid media may include water, polyester (POE), polyalkylene glycol (PAG), etc., or a combination thereof. The first cooling medium may be thermally connected to the shell 124 and the sleeve 110. The thermal connection between the first cooling medium and the shell 124 may facilitate the dissipation of heat from the shell 124 and the sleeve 110. Thereby, the components inside the shell 124 and / or the sleeve 110 may be protected from excessive temperatures. For example, Figure 2 As shown, at least one bearing 114 can transfer heat to the first cooling medium through the sleeve 110. In some embodiments, the efficiency of heat transfer between the first cooling medium and the housing 124 and / or the sleeve 110 depends at least in part on the structure of the housing 124 and / or the sleeve 110. For example, appropriately designing the outer surface of the housing 124 or the sleeve 110 can improve the efficiency of heat transfer between the first cooling medium and the housing 124 and / or the sleeve 110. For example, the exemplary structure of the housing 124 and the sleeve 110 is as follows: Figure 9 and 10 Shown in.

[0039] like Figure 1 As shown, the rotor 120 can be located between the anode 122 and the components enclosed in the sleeve 110 (e.g., at least one bearing 114). The rotor 120 can be configured to block at least a portion of the heat radiation from the anode 122 to the sleeve 110 or the components enclosed in the sleeve 110, thereby reducing the temperature of the sleeve 110 or the components sealed in the sleeve 110. For example, see Figure 3 An exemplary configuration of rotor 120 is shown. The conical stator 116 can drive the rotor 120 to rotate by providing a magnetic field at the location of the rotor 120. The conical stator 116 has a conical shape. The coils mounted on the conical stator 116 can generate a magnetic field that is tilted relative to the axial direction of the shaft 112. The tilt angle can range from 0 to 90 degrees, 10 to 80 degrees, 20 to 60 degrees, 30 to 50 degrees, etc. The conical stator 116 can be mounted on the outer surface of the housing 124 or on a retainer fixed to the housing 124.

[0040] This description is intended to be illustrative and not to limit the scope of the present application. Many alternatives, modifications and variations will be apparent to those of ordinary skill in the art. The features, structures, methods and other characteristics of the exemplary embodiments described herein may be combined in various ways to obtain additional and / or alternative exemplary embodiments. For example, the rotor flange 118 may be removed from the radiation emitting device 100. The shaft 112 and the rotor 120 may be welded or fixed together by mechanical elements (e.g., bolts, screws, nuts, gaskets, airtight glue, airtight tape). For another example, the conical stator 116 may be replaced with another stator capable of driving the rotor 120 to rotate. However, these changes and modifications do not exceed the scope of the present application.

[0041] Figure 2 It is a partially enlarged view of the radiation emitting device 100 according to some embodiments of the present application.

[0042] At least one bearing 114 can be located between the sleeve 110 and the shaft 112. The sleeve 110 can be immersed in a first cooling medium. The first cooling medium can be in a liquid or gaseous state, which exchanges heat with the sleeve 110 through the outer surface of the sleeve 110. When the radiation emitting device 100 is powered to generate X-rays, a large amount of heat can be transferred from the anode 122 to the at least one bearing 114 through, for example, the shaft 112 or thermal radiation. In addition, the high-speed rotation of the shaft 112 causes a large amount of friction in the at least one bearing 114 (for example, between the balls and the raceways), and this large amount of friction causes additional heat to be generated in the bearing 114. Therefore, the temperature of the at least one bearing 114 is higher than the temperature of the first cooling medium. For illustrative purposes, along Figure 2 Heat is transferred from the at least one bearing 114 to the first cooling medium in the directions indicated by arrows 202 and 204 in FIG.

[0043] This description is intended to be illustrative, not limiting, of the scope of the present application. Many alternatives, modifications, and variations will be apparent to those skilled in the art. The features, structures, methods, and other characteristics of the exemplary embodiments described herein may be combined in various ways to obtain additional and / or alternative exemplary embodiments. For example, the tapered stator 116 may be replaced with another stator capable of driving the rotor 120 in rotation. However, such variations and modifications are within the scope of the present application.

[0044] Figure 3 It is a partially enlarged view of the radiation emitting device 100 according to some embodiments of the present application.

[0045] like Figure 3As shown, the rotor 120 is located between the anode 122 and at least one bearing 114. The surface of the rotor 120 facing the anode 122 can be flat or concave. When the anode 122 is heated by the electrons impinging thereon, the rotor 120 can block at least a portion of the heat radiation from the anode 122. For illustrative purposes, as shown in FIG. Figure 3 Arrows 302 and 304 are shown to indicate the direction of heat radiation from anode 122 .

[0046] This description is intended to be illustrative, not to limit the scope of this application. Many alternatives, modifications, and variations will be apparent to those of ordinary skill in the art. The features, structures, methods, and other characteristics of the exemplary embodiments described herein may be combined in various ways to obtain additional and / or alternative exemplary embodiments. For example, one or more elements may be located between the anode 122 and at least one bearing 114 to further block the thermal radiation from the anode 122. For example, a thermal insulation pad may be located between the anode 122 and at least one bearing 114. However, these variations and modifications do not exceed the scope of this application.

[0047] Figure 4 is a cross-sectional view of an exemplary radiation emitting device 200 according to some embodiments of the present application.

[0048] The radiation emitting device 200 (e.g., an X-ray tube) may include an anode 230, a rotor flange 232 configured to support the anode 230, a shaft 220 mechanically connected to the rotor flange 232, at least one bearing 234, and a sleeve 236 configured to support the at least one bearing 234. The anode 230 may be similar to Figure 1 The anode 122 is shown and will not be described again here.

[0049] The shaft 220 has a shoulder 220-1 that is mechanically connected to the rotor flange 232. The shoulder 220-1 can be located at one end of the shaft 220 (e.g., Figure 4 The rotor flange 232 is formed with additional thickness (shown at the left end of the shaft 220). In some embodiments, the rotor flange 232 has a cavity configured to accommodate the shoulder 220-1 of the shaft 220. When the cavity receives the shoulder 220-1, the rotor flange 232 and the shaft 220 can be secured together using a bolt structure. In some embodiments, one or more through-holes can pass through the shoulder 220-1 of the shaft 220 and the rotor flange 232. The rotor flange 232 and the shaft 220 can be secured together using at least one screw inserted into the one or more through-holes.

[0050] At least one thermal insulation pad 222 may be located between the rotor flange 232 and the shoulder 220-1 of the shaft 220. When the rotor flange 232 is heated by the anode 230, the at least one thermal insulation pad 222 may hinder heat flow between the rotor flange 232 and the shaft 220. In some embodiments, the at least one thermal insulation pad 222 is annular and disposed around the shaft 220. For example, the at least one thermal insulation pad 222 may be made of fiberglass, cellulose, rock wool, polystyrene foam, polyurethane foam, vermiculite, perlite, cork, etc.

[0051] The shaft 220 may be supported by the sleeve 236 via at least one bearing 234. The at least one bearing 234 may be disposed around the shaft 220 to support the shaft 220. In some embodiments, the shaft 220 may be supported by two or more bearings. The two or more bearings may be spaced apart to support different portions of the shaft 220, thereby sharing the pressure caused by the high-speed rotation of the shaft 220.

[0052] Each of the at least one bearing 234 includes an inner ring, an outer ring, and balls positioned between the inner and outer rings. The inner ring may be fixedly connected to an inner ring 224 extending axially along the shaft. The outer ring may be fixedly connected to an outer ring 228 extending axially along the shaft 220. In some embodiments, each inner ring of the at least one bearing 234 and the inner ring 224 may rotate with the shaft 220. Each outer ring of the at least one bearing 234 may be mounted on a sleeve 236 and support the remaining components of the bearing 234.

[0053] Adjustment ring 216 can be configured to adjust the spacing between the inner and outer races of at least one bearing 234. One side of adjustment ring 216 can be mounted on sleeve 236, and the other side of adjustment ring 216 can be mounted on inner ring 226. In some embodiments, adjustment ring 216 can maintain a relatively large spacing between the inner and outer races of at least one bearing 234. Therefore, when the temperature of bearing 234 increases, the relatively large spacing can prevent the bearing balls from expanding and becoming stuck.

[0054] The bearing 234 may abut the spring 214 on one side of the bearing 234. The spring 214 may apply compressive stress to the bearing 234 in the axial direction of the shaft 220. In addition, the bearing 234 may abut the retaining ring 218 on the other side of the bearing 234. At least a portion of the retaining ring 218 may engage with the sleeve 236, thereby limiting or preventing movement of the bearing in the axial direction of the shaft 220.

[0055] The shaft 220 is hollow. The hollow can accommodate the first pipe 210 and the second pipe 226. The first pipe 210 can be mounted on the sleeve 236 through the retainer 212. For example, the first pipe 210 can be welded or bonded to the retainer 212, and in turn, the retainer 212 can be welded or bonded to one end of the sleeve 236 (e.g., Figure 4As shown, the right end of the sleeve 236). The second pipe 226 can be directly welded or bonded to the sleeve 236. Figure 4 As shown, the point where the second pipe 226 is welded or bonded to the sleeve 236 may be located near the right end of the shaft 220. In some embodiments, the sidewall of the second pipe 226 may be spaced apart from the inner surface of the shaft 220 by a certain distance along the radial direction of the shaft 220. The gap between the sidewall of the second pipe 226 and the inner surface of the shaft 220 may be maintained in a vacuum state or filled with air.

[0056] At least a portion of the first pipe 210 may be located inside the second pipe 226. The first pipe 210 and the second pipe 226 may form at least two channels within the hollow interior of the shaft 220. For example, the space inside the first pipe 210 may form a first channel, and the gap between the first pipe 210 and the second pipe 226 may form a second channel. The first channel may be in fluid communication with the second channel (e.g., liquid or gas), such that the second cooling medium may flow into the first channel and out of the second channel, or flow into the second channel and out of the first channel. For example, Figure 7 An exemplary fluid communication between the first channel and the second channel is found in .

[0057] The second cooling medium can be in a liquid or gaseous state and can exchange heat with the shaft 220 through the second pipe 226 and the gap between the second pipe 226 and the inner surface of the shaft 220 (if any). Exemplary second cooling media can include air, inert gas, water, polyester (POE), polyalkylene glycol (PAG), etc. or a combination thereof. It should be noted that a more complex channel arrangement can be achieved by inserting more pipes into the hollow of the shaft 220, or using pipes with specially designed shapes or structures instead of straight pipes. For example, a labyrinthine channel can be used, and the second cooling medium can flow into and out of the labyrinthine channel through at least one inlet and at least one outlet of the second cooling medium.

[0058] Rotor flange 232 may have a cavity that accommodates at least a portion of second pipe 226. Therefore, at least a portion of the second cooling medium may flow through the cavity and remove at least a portion of the heat from rotor flange 232. The heat exchange between rotor flange 232 and the second cooling medium flowing through the cavity of rotor flange 232 may prevent rotor flange 232 from overheating.

[0059] like Figure 1 As shown, sleeve 236 can be immersed in a first cooling medium. The first cooling medium can be the same as or different from the second cooling medium. In some embodiments, the first cooling medium and the second cooling medium can be combined into a single storage tank. In some embodiments, the first cooling medium and the second cooling medium can be pumped using the same or different pumps.

[0060] This description is intended to be illustrative and not to limit the scope of the present application. Many alternatives, modifications, and variations will be apparent to those skilled in the art. The features, structures, methods, and other characteristics of the exemplary embodiments described herein may be combined in various ways to obtain additional and / or alternative exemplary embodiments. For example, the cavity of the rotor flange 118 may form an independent channel isolated from the first channel and the second channel. Heat may be transferred from the rotor flange 118 to independent channels for the flow of cooling medium into and out of the rotor flange 118. For another example, the radiation emitting device 200 may include a device similar to Figure 1 However, these changes and modifications will not exceed the scope of the present application.

[0061] Figure 5 It is a partially enlarged view of the radiation emitting device 200 shown in some embodiments of the present application.

[0062] The right end of the first pipe 210 can be located outside the sleeve 236. The first pipe 210 can be supported by a retainer 212. The retainer 212 can have a first portion 212-1 and a second portion 212-2. The first portion 212-1 is perpendicular to the axial direction of the first pipe 210, and the second portion 212-2 is parallel to the axial direction of the first pipe 210. For example, the first portion 212-1 can be attached or coupled to the right end of the sleeve 236 by welding one or more mechanical elements (e.g., bolts, screws, nuts, washers, airtight glue, airtight tape, etc.), or a combination thereof. The second portion 212-2 can be attached or coupled to the second pipe 226 by welding one or more mechanical elements (e.g., bolts, screws, nuts, washers, airtight glue, airtight tape, etc.), or a combination thereof. Conversely, the second pipe 226 can be welded or coupled to the sleeve 236. The feature 510 may be a gap (eg, a groove) formed by removing a portion of the sleeve 236 to facilitate connection (eg, welding, bonding, etc.) between the second pipe 226 and the sleeve 236 .

[0063] This description is intended to be illustrative, rather than limiting the scope of the present application. Many substitutions, modifications, and variations will be apparent to those of ordinary skill in the art. The features, structures, methods, and other characteristics of the exemplary embodiments described herein may be combined in various ways to obtain additional and / or alternative exemplary embodiments. For example, the angle formed by the first portion 212-1 and the second portion 212-2 may be a value different from 90 degrees. However, these variations and modifications will not exceed the scope of the present application.

[0064] Figure 6 FIG. 2 is a partial side view of the radiation emitting device 200 along the axial direction of the axis 220 according to some embodiments of the present application.

[0065] The first portion 212-1 of the retainer 212 can be shaped like a cross. The ring inside the cross can represent a side view of the first pipe 210. Different rings outside the cross can represent a side view of the second portion 212-2 of the retainer 212, the second pipe 226, the assembly 510, and the sleeve 236. The diameter of the second pipe 226 is greater than the diameter of the first pipe 210. In some embodiments, the diameter of the second pipe 226 is 1.5 times, 2 times, 2.5 times, 3 times, etc., the diameter of the first pipe 210.

[0066] This description is intended to be illustrative, not limiting, of the scope of this application. Many alternatives, modifications, and variations will be apparent to those of ordinary skill in the art. The features, structures, methods, and other characteristics of the exemplary embodiments described herein may be combined in various ways to obtain additional and / or alternative exemplary embodiments. For example, the retainer 212 may be in any other shape, such as a star, a snowflake, or the like. However, these variations and modifications do not exceed the scope of this application.

[0067] Figure 7 is a cross-sectional view of a portion of a radiation emitting device and exemplary fluid communications within shaft 220 according to some embodiments of the present application.

[0068] like Figure 7 As shown by the arrows in FIG, the cooling medium (eg, the second cooling medium) can flow into the first pipe 210 (ie, as shown in FIG. Figure 4 ) and from the second conduit 226 (ie, as shown in the first channel Figure 4 In some embodiments, the right end of the first pipe 210 can be connected to a pump. During operation of the radiation emitting device 200, the pump can continuously push the cooling medium into the first pipe 210. The flow rate of the cooling medium can be determined by the power of the pump. For example, the power of the pump can be varied according to the temperature of the components of the radiation emitting device 200 (e.g., the anode 230, the at least one bearing 234).

[0069] This description is intended to be illustrative, not to limit the scope of this application. Many alternatives, modifications, and variations will be apparent to those of ordinary skill in the art. The features, structures, methods, and other characteristics of the exemplary embodiments described herein may be combined in various ways to obtain additional and / or alternative exemplary embodiments. For example, the flow direction of the cooling medium may be reversed. For another example, the passage may be fluidically connected via multiple inlets or outlets. However, these variations and modifications do not exceed the scope of this application.

[0070] Figure 8is a perspective view of an exemplary radiation emitting device 800 according to some embodiments of the present application. As shown, the radiation emitting device 800 may include a housing 810 that can accommodate at least two components (e.g., rotor flange 118, rotor 120, anode 122, cathode 126, etc.) and a sleeve 812 that can accommodate other components of the radiation emitting device 800 (e.g., shaft 112, at least bearing 114, etc.). The housing 810 and sleeve 812 may be welded or otherwise bonded together as described elsewhere in this application. The complete structure formed by the housing 810 and sleeve 812 may be immersed in a cooling medium during operation of the radiation emitting device 800.

[0071] In some embodiments, Figure 9 As shown, the outer surface of the housing 810 is a first wavy surface. The first wavy surface can be regularly or irregularly distributed around the housing 810. The housing 810 can be thermally connected to the cooling medium through the first wavy surface.

[0072] In some embodiments, as Figure 10 As shown, the outer surface of the sleeve 812 is a second wavy surface (e.g., a concave surface). The second wavy surface can be regularly or irregularly distributed around the sleeve 812. It should be noted that the surface area of ​​the first wavy surface or the second wavy surface is larger than that of the corresponding smooth surface (e.g., a circular surface), thereby improving the heat transfer efficiency between the radiation emitting device 800 and the cooling medium.

[0073] This description is intended to be illustrative, rather than limiting the scope of the application. For those of ordinary skill in the art, many substitutions, modifications, and variations will be apparent. The features, structures, methods, and other characteristics of the exemplary embodiments described herein can be combined in various ways to obtain additional and / or alternative exemplary embodiments. For example, the outer surface of shell 810 or sleeve 812 can be any regular or irregular shape. However, these variations and modifications will not exceed the scope of the application.

[0074] This description is intended to be illustrative, not to limit the scope of this application. Many alternatives, modifications, and variations will be apparent to those skilled in the art. The features, structures, methods, and other characteristics of the exemplary embodiments described herein may be combined in various ways to obtain additional and / or alternative exemplary embodiments. For example, three or more groups of pixels may be connected to the same signal transmission board. However, these variations and modifications do not exceed the scope of this application.

[0075] The above description of the embodiments is for the purpose of understanding the present application, not for limiting the scope of the present application. For those with ordinary skills in the art, various changes and modifications can be made according to the present application. However, these changes and modifications do not depart from the scope of the present application.

[0076] The basic concepts have been described above. It will be apparent to those skilled in the art after reading this application that the above disclosures are merely illustrative and do not constitute limitations on this application. Although not explicitly stated herein, those skilled in the art may make various modifications, improvements, and amendments to this application. Such modifications, improvements, and amendments are suggested in this application and remain within the spirit and scope of the exemplary embodiments of this application.

[0077] At the same time, this application uses specific terms to describe the embodiments of this application. For example, "one embodiment," "an embodiment," and / or "some embodiments" refer to a certain feature, structure, or characteristic related to at least one embodiment of this application. Therefore, it should be emphasized and noted that "one embodiment," "an embodiment," or "an alternative embodiment" mentioned twice or more in different places in this specification does not necessarily refer to the same embodiment. In addition, certain features, structures, or characteristics in one or more embodiments of this application may be appropriately combined.

[0078] In addition, it will be appreciated by those skilled in the art that various aspects of the present application can be illustrated and described by a number of patentable categories or situations, including any new and useful combination of processes, machines, products or substances, or any new and useful improvements thereto. Accordingly, various aspects of the present application can be performed entirely by hardware, can be performed entirely by software (including firmware, resident software, microcode, etc.), or can be performed by a combination of hardware and software. The above hardware or software can all be referred to as "blocks", "modules", "devices", "units", "components" or "systems". In addition, various aspects of the present application can take the form of a computer program product embodied in one or more computer-readable media, wherein the computer-readable program code is contained therein.

[0079] A computer-readable signal medium may include, for example, a propagated data signal in baseband or as part of a frame wave, containing computer-readable program code. Such propagated signals may have a variety of forms, including electromagnetic, optical, etc., or any suitable combination. A computer-readable signal medium may be any computer-readable medium other than a computer-readable storage medium that can be connected to an instruction execution system, device, or apparatus to communicate, propagate, or transmit a program for use. The program code on the computer-readable signal medium may be propagated via any suitable medium, including radio, cable, fiber optic cable, RF, etc., or any combination of the above.

[0080] The computer program code required for the operation of various aspects of the present application can be written in any combination of one or more programming languages, including object-oriented programming, such as Java, Scala, Smalltalk, Eiffel, JADE, Emerald, C++, C#, VB.NET, Python or similar conventional programming languages, such as "C" programming language, Visual Basic, Fortran2008, Perl, COBOL 2002, PHP, ABAP, dynamic programming languages ​​such as Python, Ruby and Groovy, or other programming languages. The program code can be executed entirely on the user's computer, partially on the user's computer, as an independent software package, partially on the user's computer, partially on a remote computer or entirely on a remote computer or server. In the latter case, the remote computer can be connected to the user's computer through any network form, such as a local area network (LAN) or a wide area network (WAN), or connected to an external computer (e.g., via the Internet), or in a cloud computing environment, or used as a service such as software as a service (SaaS).

[0081] In addition, unless expressly stated in the claims, the order of the processing elements and sequences described in this application, the use of alphanumeric characters, or the use of other names are not intended to limit the order of the processes and methods of this application. Although the above disclosure discusses some of the invention embodiments currently considered useful through various examples, it should be understood that such details are for illustrative purposes only, and the appended claims are not limited to the disclosed embodiments. On the contrary, the claims are intended to cover all modifications and equivalent combinations that are consistent with the spirit and scope of the embodiments of this application. For example, although the implementation of the various components described above can be embodied in a hardware device, it can also be implemented as a software-only solution - for example, installation on an existing server or mobile device.

[0082] Similarly, it should be noted that, in order to simplify the presentation of this disclosure and thereby facilitate understanding of one or more embodiments of the invention, the foregoing descriptions of the embodiments of this disclosure sometimes combine multiple features into a single embodiment, figure, or description thereof. However, this approach should not be interpreted as reflecting an intention that the claimed object material to be scanned requires more features than expressly recited in each claim. Rather, the subject matter of the invention may include fewer features than the single embodiment described above.

[0083] In some embodiments, the numbers representing quantities, properties, etc. used to describe and claim some embodiments of the present application should be understood as being modified by the terms "about", "approximately" or "substantially" in some cases. Unless otherwise stated, "about", "approximately" or "substantially" indicate that the numbers are allowed to vary by ±20%. Accordingly, in some embodiments, the numerical parameters used in the specification and claims are approximate values, which may change according to the required characteristics of individual embodiments. In some embodiments, the numerical parameters should take into account the specified significant digits and adopt the general method of retaining digits. Although the numerical fields and parameters used to confirm the breadth of their range in some embodiments of the present application are approximate values, in specific embodiments, the settings of such numerical values ​​are as accurate as possible within the feasible range.

[0084] All patents, patent applications, patent application publications, and other materials (such as papers, books, specifications, publications, records, things, and / or the like) referred to herein are hereby incorporated by reference in their entirety for all purposes, except any prosecution record related to such documents, any such documents that are inconsistent or conflicting with this document, or any such documents that limit the broad scope of the claims that may or may not be related to this document. For example, if there is any inconsistency or conflict between the description, definitions, and / or use of terms associated with any incorporated material and the terminology associated with this document, the description, definitions, and / or use of terminology in this document will control.

[0085] It should be understood that the embodiments of the present application disclosed herein are illustrative of the principles of the embodiments of the present application. Other variations may also fall within the scope of the present application. Therefore, as examples and not limitations, alternative configurations of the embodiments of the present application may be considered consistent with the teachings of the present application. Accordingly, the embodiments of the present application are not limited to the embodiments explicitly introduced and described in the present application.

[0086] Finally, it should be understood that the embodiments described in this application are intended only to illustrate the principles of the embodiments of the present application. Other variations may also fall within the scope of this application. Therefore, by way of example and not limitation, alternative configurations of the embodiments of the present application may be considered consistent with the teachings of this application. Therefore, the embodiments of the present application are not limited to the precise embodiments shown and described.

Claims

1. Radiation emitting device, including: a cathode configured to emit an electron beam; an anode configured to rotate on an axis, the anode configured to receive the electron beam; a rotor configured to drive the anode to rotate, the rotor being mechanically coupled to the shaft; a conical stator and a coil mounted on the conical stator, wherein the magnetic field generated by the coil drives the rotor to rotate, and the magnetic field is inclined relative to the axial direction of the shaft; a sleeve configured to support the shaft via at least one bearing, the rotor being positioned between the anode and the sleeve; as well as A housing is configured to seal the cathode, the anode, and the rotor.

2. The radiation emitting device according to claim 1, characterized in that: The housing is connected to the sleeve, at least a portion of the sleeve is located outside the housing, and both the housing and the sleeve are immersed in a first cooling medium.

3. The radiation emitting device according to claim 1, wherein: The rotor and the sleeve are arranged side by side along the axial direction of the shaft.

4. The radiation emitting device according to claim 1, characterized in that: The rotor is located between the anode and the at least one bearing.

5. The radiation emitting device according to claim 1, characterized in that: The rotor is connected to the shaft by at least one flange, and one or more of the at least one flange is configured to support the anode.

6. The radiation emitting device according to any one of claims 1 to 5, characterized in that: An inclination angle of the magnetic field relative to the axial direction of the shaft is in a range of 10 degrees to 80 degrees.

7. The radiation emitting device according to claim 1, characterized in that: The at least one bearing comprises two bearings, The two bearings each have an inner ring and an outer ring, the inner ring is connected to the inner ring, and the outer ring is connected to the outer ring, and The distance between the inner ring and the outer ring is adjusted by an adjusting ring.

8. The radiation emitting device according to claim 7, characterized in that: A first side of the adjustment ring is mounted on the sleeve, and a second side of the adjustment ring is mounted on the inner ring.

9. The radiation emitting device according to claim 1, characterized in that: The at least one bearing abuts a retaining ring, and at least a portion of the retaining ring cooperates with the sleeve to restrict movement of the at least one bearing in an axial direction along the shaft.

10. The radiation emitting device according to claim 1, characterized in that: The at least one bearing abuts a spring on one side of the at least one bearing, and the spring applies compressive stress to the at least one bearing in an axial direction of the shaft.

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