X-ray tube heat dissipation device and x-ray tube with the same

Abstract

The embodiment of the present application relates to a kind of X-ray tube heat sink and the X-ray tube with the heat sink, the heat sink includes first heat dissipation module and second heat dissipation module;First heat dissipation module is set to the both ends of anode target surface, the first heat dissipation module is formed by the rotation of the anode target surface rotation magnetic field;Second heat dissipation module is set to the outside of the tube shell of the X-ray tube, the second heat dissipation module is inducted by cutting the magnetic force line of the rotation magnetic field to generate current to dissipate heat.The technical scheme of the embodiment of the present application, for the low efficiency problem existing in the heat transfer of the heat radiation or heat conduction mode in the prior art, heat is transferred to the outside of tube shell by thermoelectric effect and electromagnetic induction effect, which greatly improves the heat dissipation efficiency.Using thermoelectric effect and electromagnetic induction effect to realize the transfer of heat is not limited by radiation area and material, and the dissipation of heat and efficiency are improved.

Description

Technical Field

[0001] The present invention relates to the field of instrument heat dissipation technology, and in particular to an X-ray tube heat dissipation device and an X-ray tube having the heat dissipation device. Background Technology

[0002] The principle of an X-ray tube is that when the cathode filament is energized, it heats up and releases electrons, which then collide at high speed with the anode target under the influence of a high-voltage electric field. While generating X-rays, the vast majority (approximately 99%) of the energy is converted into heat and needs to be dissipated. Currently, X-ray tubes primarily dissipate heat through thermal radiation, such as by using the rotating anode target surface to radiate heat to the tube shell. However, this method is limited by the radiation area and material properties, resulting in relatively low efficiency. Summary of the Invention

[0003] Based on the above-mentioned situation of the prior art, the purpose of this invention is to provide an X-ray tube heat dissipation device and an X-ray tube having the heat dissipation device, which utilizes the thermoelectric effect and electromagnetic induction effect to transfer heat to the outside of the tube shell through electromagnetic coupling, thereby greatly improving the efficiency of heat dissipation.

[0004] To achieve the above objectives, according to one aspect of the present invention, an X-ray tube heat dissipation device is provided, the X-ray tube including a tube shell and a cathode and an anode disposed within the tube shell, the anode including a rotatable target surface; the heat dissipation device includes a first heat dissipation module and a second heat dissipation module;

[0005] The first heat dissipation module is disposed at both ends of the target surface, and the first heat dissipation module generates a rotating magnetic field by rotating the target surface;

[0006] The second heat dissipation module is disposed outside the shell of the X-ray tube. The second heat dissipation module induces current by cutting the magnetic lines of force of the rotating magnetic field to dissipate the heat generated during the operation of the X-ray tube.

[0007] Furthermore, the first heat dissipation module includes a thermocouple pair, which is fixed to the outer edge of the target surface along the rotation axis direction of the target surface.

[0008] The thermocouple pair includes a first thermocouple and a second thermocouple, with the first thermocouple and the second thermocouple respectively disposed at the hot end and cold end of the target surface.

[0009] Furthermore, the first thermocouple and the second thermocouple have the same structure and are both welded together from the ends of two different metal wires.

[0010] Furthermore, the thermocouple pair is made of a material capable of withstanding temperatures above 2000 degrees Celsius.

[0011] Furthermore, the first thermocouple is positioned at a first location on the target surface near the point of electron beam bombardment; the second thermocouple is positioned at a second location on the target surface away from the first location.

[0012] Furthermore, the second heat dissipation module includes an induction coil circuit;

[0013] The induction coil circuit is wound around the outside of the X-ray tube shell, and the output end of the induction coil circuit is connected to a load.

[0014] Furthermore, the induction coil circuit cuts the magnetic lines of force of the rotating magnetic field to induce a current.

[0015] Furthermore, the second heat dissipation module includes a metal sheet.

[0016] Furthermore, the metal sheet cuts the magnetic lines of force of the rotating magnetic field, inducing eddy currents.

[0017] According to another aspect of the present invention, an X-ray tube with a heat dissipation device is provided, the X-ray tube comprising a tube shell and an anode and a cathode enclosed inside the tube shell;

[0018] The anode includes a rotatable target surface that serves as the target surface;

[0019] The cathode is disposed opposite to the anode, and the cathode includes a filament for emitting an electron beam toward the target surface during X-ray tube operation;

[0020] The heat dissipation device is disposed on the X-ray tube to dissipate the heat generated during the operation of the X-ray tube; the heat dissipation device includes the heat dissipation device as described in the first aspect of the present invention.

[0021] In summary, this invention provides an X-ray tube heat dissipation device and an X-ray tube having the same device. The X-ray tube includes a tube shell and a cathode and an anode disposed within the tube shell. The anode includes a rotatable target surface. The heat dissipation device includes a first heat dissipation module and a second heat dissipation module. The first heat dissipation module is disposed at both ends of the target surface, and the rotation of the target surface generates a rotating magnetic field. The second heat dissipation module is disposed outside the tube shell of the X-ray tube, and it dissipates heat generated during X-ray tube operation by inducing a current by cutting the magnetic lines of force of the rotating magnetic field. The X-ray tube heat dissipation device provided by this invention transfers heat to the outside of the tube shell through thermoelectric and electromagnetic induction effects, greatly improving heat dissipation efficiency.

[0022] The present invention has the following beneficial technical effects:

[0023] (1) In view of the problem that the heat transfer by means of thermal radiation or thermal conduction in the prior art is inefficient, the embodiments of the present invention transfer heat to the outside of the tube shell through thermoelectric effect and electromagnetic induction effect, which greatly improves the heat dissipation efficiency.

[0024] (2) Heat transfer is achieved by utilizing thermoelectric effect and electromagnetic induction effect. The high heat generated by the target surface of the X-ray tube during operation is converted into current induced by the second heat dissipation module, and the current is dissipated into the load in the form of heat. It is not limited by radiation area and material, and the heat dissipation and efficiency are improved. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the structure of an X-ray tube;

[0026] Figure 2 This is a schematic diagram of the formation of thermoelectric current;

[0027] Figure 3 This is a schematic diagram of the structure of the X-ray tube heat dissipation device according to an embodiment of the present invention;

[0028] Explanation of reference numerals in the attached figures:

[0029] 101-Tube shell; 102-Cathode; 103-Anode; 104-Stator; 1021-Filament; 1031-Target surface; 1032-Hot end; 1033-Cold end; 2051-First thermocouple; 2052-Second thermocouple; 2053-Induction coil circuit. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to specific embodiments and the accompanying drawings. It should be understood that these descriptions are merely exemplary and not intended to limit the scope of the invention. Furthermore, descriptions of well-known structures and techniques are omitted in the following description to avoid unnecessarily obscuring the concept of the invention.

[0031] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar modules or modules having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0032] It should be noted that, unless otherwise defined, the technical or scientific terms used in the embodiments of this invention should have the ordinary meaning understood by those skilled in the art to which this invention pertains. The terms "first," "second," and similar terms used in the embodiments of this invention do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are only used to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0033] An X-ray tube is a vacuum diode that operates at high voltage. Figure 1 The diagram shows the structure of an X-ray tube. Figure 1 The X-ray tube typically includes a tube housing 101 and an anode 103 and a cathode 102 enclosed within the tube housing. The anode 103 includes a rotatable target surface 1031 serving as the target surface, with an electron beam bombardment point (hot end 1032) at its front end and a cold end 1033 at its rear end. The cathode 102 is disposed opposite the anode 103 and includes a filament 1021 for emitting an electron beam toward the target surface 1031 during X-ray tube operation. The X-ray tube also includes a motor with a rotor and a stator 104 connected to the target surface 1031.

[0034] The principle of an X-ray tube is that when the cathode filament 1021 is energized, it heats up and releases an electron beam. Under the influence of a high-voltage electric field, the electron beam strikes the electron beam at high speed towards the hot end 1032 on the anode target 1031. While generating X-rays, most (approximately 99%) of the energy is converted into heat and needs to be dissipated. Since the operating temperature of the target 1031 is as high as 2000 degrees Celsius, the high temperature significantly affects the performance and lifespan of the X-ray tube. Therefore, it is necessary to dissipate the high heat generated by the target surface outside the tube shell. Current X-ray tube designs primarily rely on the rotating anode target 1031 radiating heat to the tube shell 101. This heat dissipation method is limited by the radiation area and material, resulting in relatively low efficiency.

[0035] To address the aforementioned problems in the prior art, embodiments of the present invention provide a heat dissipation device that utilizes the thermoelectric effect and electromagnetic induction effect to transfer heat to the outside of the tube shell via electromagnetic coupling. The Seebeck effect, also known as the first thermoelectric effect, refers to the thermoelectric phenomenon caused by the temperature difference between two different electrical conductors or semiconductors, resulting in a voltage difference between the two substances. Generally, the direction of the thermoelectric potential is defined as: electrons flow from negative to positive at the hot end. Figure 2 The diagram shows a schematic of the formation of thermocurrent, such as... Figure 2 As shown, in a circuit composed of two metal wires A and B, if the temperatures of the two contact points are made different, a current will appear in the circuit, called a thermocurrent. The corresponding electromotive force is called the thermoelectric potential, and its direction depends on the direction of the temperature gradient. Electromagnetic induction refers to the phenomenon that a conductor placed in a changing magnetic flux will generate an electromotive force. This electromotive force is called the induced electromotive force or the generated electromotive force. If this conductor is closed into a circuit, this electromotive force will drive the flow of electrons, forming an induced current.

[0036] The technical solutions of the embodiments of the present invention will be described in detail below with reference to the accompanying drawings. According to one embodiment of the present invention, an X-ray tube heat dissipation device is provided, and a schematic diagram of the structure of the X-ray tube heat dissipation device is shown below. Figure 3 As shown. The structure of the X-ray tube is similar to... Figure 1 The X-ray tube shown has the same structure, including a tube shell 101 and an anode and a cathode 102 enclosed inside the tube shell 101. The anode includes a rotatable target surface that serves as the target surface. The front end of the target surface has an electron beam bombardment point, i.e., a hot end 1032, and the rear end is a cold end 1033. The cathode 102 is disposed opposite to the anode and includes a filament for emitting an electron beam toward the target surface during X-ray tube operation.

[0037] The heat dissipation device provided in this embodiment of the invention includes a first heat dissipation module and a second heat dissipation module; the first heat dissipation module is disposed at both ends of the target surface, and the first heat dissipation module generates a rotating magnetic field by rotating the target surface; the second heat dissipation module is disposed outside the tube shell of the X-ray tube, and the second heat dissipation module induces current by cutting the magnetic lines of force of the rotating magnetic field to dissipate heat.

[0038] According to some embodiments, the first heat dissipation module includes a thermocouple pair, which is fixed to the outer edge of the target surface along the rotation axis of the target surface. The thermocouple pair is insulated from the target surface and has no electrical connection. The thermocouple pair may include a first thermocouple 2051 and a second thermocouple 2052. For example, the first thermocouple 2051 is disposed at the hot end 1032 of the anode target surface, and the second thermocouple 2052 at the cold end 1033. The first thermocouple 2051 and the second thermocouple 2052 have the same structure and are both formed by fusion welding the ends of two different metal wires. The welding method for the thermocouple ends can be, for example, electric welding, butt welding, or stranded electric welding. According to some embodiments, the first thermocouple 2051 can be disposed at a first position on the target surface near the electron beam bombardment point, and the second thermocouple 2052 can be disposed at a second position on the target surface away from the first position. This thermocouple pair is typically made of two different metal wires twisted together and can withstand temperatures above 2000 degrees Celsius. Since the operating temperature of the target surface is as high as 2000 degrees Celsius, materials capable of withstanding high temperatures are required to construct the thermocouple. For example, a WRe3 / 25 tungsten-rhenium thermocouple pair can be used, which can withstand temperatures up to 2330 degrees Celsius.

[0039] Thermocouple pairs are arranged at the hot end (i.e., the electron beam bombardment point) and the cold end of the target surface, with the hot end fixed close to the electron beam bombardment point and the cold end fixed away from the hot end. According to the Seebeck effect, in a circuit composed of two metals, if the temperatures of the two contact points are different, a thermoelectric potential will appear in the circuit, the direction of which depends on the direction of the temperature gradient. Since the thermocouple forms a circular current, the circular current generates a magnetic field, and this magnetic field becomes a rotating magnetic field due to the rotation of the target surface.

[0040] According to some embodiments, the second heat dissipation module includes an induction coil circuit 2053. The induction coil circuit 2053 is wound around the outside of the X-ray tube housing 101. The output terminal of the induction coil circuit 2053 can be connected to a load such as a resistor. The induction coil circuit 2053 cuts the magnetic lines of force of the rotating magnetic field, inducing a current. The induced current is dissipated as heat in the connected load such as the resistor, thereby achieving efficient heat dissipation. In this embodiment, the induction coil wire is, for example, an insulated wire, which is fixed to the housing and insulates it. Common induction coils in the art can be used, and there are no specific limitations on the number of turns or the material of the induction coil.

[0041] According to some embodiments, the second heat dissipation module may also include a metal sheet surrounding the exterior of the X-ray tube housing 101. The metal sheet cuts the magnetic lines of force of the rotating magnetic field, inducing eddy currents. These induced eddy currents are dissipated as heat within the metal sheet, thereby achieving efficient heat dissipation. The metal sheet may be, for example, a hollow cylindrical structure, or it may consist of two metal rings forming the two ends of a cylindrical structure, with the two metal rings interconnected by multiple metal strips. The cylindrical structure is coaxial with the X-ray tube housing 101 and insulated from the exterior of the housing 101.

[0042] Based on the electromagnetic induction effect, an induction coil circuit 2053 is arranged outside the casing 101, and its output terminal is connected to a resistor or load. Alternatively, a metal sheet is arranged outside the casing 101. The coil circuit 2053 will induce a current by cutting magnetic lines of force, or the metal sheet will induce eddy currents by cutting magnetic lines of force. This current or eddy current will dissipate as heat in the coil, resistor, load, or metal sheet. This is equivalent to transferring heat energy outside the casing 101 through electromagnetic coupling. By converting heat into current through thermoelectric and electromagnetic induction effects and dissipating this current as heat to the load, the limitations of radiation area and material can be overcome, improving both heat dissipation and efficiency.

[0043] According to another embodiment of the present invention, an X-ray tube with a heat dissipation device is provided, the structural schematic diagram of which is shown below. Figure 3 As shown, the X-ray tube includes a tube housing 101 and an anode and a cathode 102 enclosed within the tube housing. The anode includes a rotatable target surface serving as the target surface. The cathode 102 is disposed opposite to the anode and includes a filament for emitting an electron beam towards the target surface during X-ray tube operation. A heat dissipation device is disposed on the X-ray tube, specifically configured as described in the above embodiments, to dissipate the heat generated during X-ray tube operation. The heat dissipation device is, for example, the heat dissipation device involved in the above embodiments of the present invention, and will not be described again here. By employing the heat dissipation device provided in the above embodiments, the X-ray tube has high heat dissipation efficiency, avoiding the significant impact of high-temperature operating conditions on the performance and lifespan of the X-ray tube.

[0044] In summary, the embodiments of the present invention relate to an X-ray tube heat dissipation device and an X-ray tube having the heat dissipation device. The X-ray tube includes a tube shell and a cathode and an anode disposed within the tube shell. The anode includes a rotatable target surface. The heat dissipation device includes a first heat dissipation module and a second heat dissipation module. The first heat dissipation module is disposed at both ends of the target surface, and the first heat dissipation module generates a rotating magnetic field by rotating the target surface. The second heat dissipation module is disposed outside the tube shell of the X-ray tube, and the second heat dissipation module induces a current by cutting the magnetic lines of force of the rotating magnetic field to dissipate the heat generated during the operation of the X-ray tube. The technical solution of the embodiments of the present invention addresses the problem of low efficiency in heat transfer by thermal radiation or thermal conduction in the prior art. It achieves heat transfer to the outside of the tube shell through thermoelectric effect and electromagnetic induction effect, greatly improving heat dissipation efficiency. By utilizing thermoelectric effect and electromagnetic induction effect to achieve heat transfer, the high heat generated by the target surface of the X-ray tube during operation is converted into a current induced by the second heat dissipation module, and the current is dissipated into the load in the form of heat. This is not limited by radiation area and material, and both heat dissipation and efficiency are improved.

[0045] It should be understood that the specific embodiments described above are merely illustrative or explanatory of the principles of the invention and do not constitute a limitation thereof. Therefore, any modifications, equivalent substitutions, improvements, etc., made without departing from the spirit and scope of the invention should be included within the protection scope of the invention. Furthermore, the appended claims are intended to cover all variations and modifications falling within the scope and boundaries of the appended claims, or equivalent forms of such scope and boundaries.

Claims

1. A heat dissipation device for an X-ray tube, characterized in that, The X-ray tube includes a tube shell and a cathode and an anode disposed within the tube shell, the anode including a rotatable target surface; the heat dissipation device includes a first heat dissipation module and a second heat dissipation module; The first heat dissipation module is disposed at both ends of the target surface, and the first heat dissipation module generates a rotating magnetic field by rotating the target surface; The second heat dissipation module is disposed outside the shell of the X-ray tube. The second heat dissipation module induces current by cutting the magnetic lines of force of the rotating magnetic field to dissipate the heat generated during the operation of the X-ray tube.

2. The apparatus according to claim 1, characterized in that, The first heat dissipation module includes a thermocouple pair, which is fixed to the outer edge of the target surface along the rotation axis direction of the target surface; The thermocouple pair includes a first thermocouple and a second thermocouple, with the first thermocouple and the second thermocouple respectively disposed at the hot end and cold end of the target surface.

3. The apparatus according to claim 2, characterized in that, The first thermocouple and the second thermocouple have the same structure and are both welded together from the ends of two different metal wires.

4. The apparatus according to claim 2, characterized in that, The thermocouples are made of materials that can withstand temperatures above 2000 degrees Celsius.

5. The apparatus according to claim 2, characterized in that, The first thermocouple is positioned at a first location on the target surface near the point of electron beam bombardment; the second thermocouple is positioned at a second location on the target surface away from the first location.

6. The apparatus according to claim 1, characterized in that, The second heat dissipation module includes an induction coil circuit; The induction coil circuit is wound around the outside of the X-ray tube shell, and the output end of the induction coil circuit is connected to a load.

7. The apparatus according to claim 6, characterized in that, The induction coil circuit cuts the magnetic lines of force of the rotating magnetic field to induce a current.

8. The apparatus according to claim 1, characterized in that, The second heat dissipation module includes a metal plate.

9. The apparatus according to claim 8, characterized in that, The metal sheet cuts the magnetic lines of force of the rotating magnetic field, inducing eddy currents.

10. An X-ray tube with a heat dissipation device, characterized in that, The X-ray tube includes a tube shell and an anode and a cathode enclosed inside the tube shell; The anode includes a rotatable target surface that serves as the target surface; The cathode is disposed opposite to the anode, and the cathode includes a filament for emitting an electron beam toward the target surface during X-ray tube operation; The heat dissipation device is disposed on the X-ray tube to dissipate the heat generated during the operation of the X-ray tube; the heat dissipation device includes the heat dissipation device as described in any one of claims 1-9.

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