X-ray imaging apparatus and wireless power transfer device with electromagnetic shielding function

Abstract

This disclosure provides an X-ray imaging device and a wireless power transmission device with electromagnetic shielding. The wireless power transmission device includes: a first annular structure, on which a first frame is fixed, and a first winding is wound; a second annular structure, on which a second frame is fixed, and a second winding is wound; wherein the second annular structure is rotatable relative to the first annular structure; and a metal shielding assembly disposed relative to the first winding and / or the second winding, the metal shielding assembly being used to generate a reverse magnetic field based on the eddy current effect to weaken the main magnetic flux of the wireless power transmission device. This disclosure utilizes the reverse magnetic field generated by the metal shielding assembly based on the eddy current effect to weaken the main magnetic flux of the wireless power transmission device, thereby reducing magnetic field leakage and thus reducing electromagnetic interference of the wireless power transmission device.

Description

Technical Field

[0001] This disclosure relates to the field of medical device technology, and in particular to an X-ray imaging device and a wireless power transmission device with electromagnetic shielding function. Background Technology

[0002] In recent years, X-ray computed tomography (CT) has made tremendous progress in both its basic technology and new clinical applications, becoming one of the most exciting diagnostic methods in the field of medical imaging. X-ray CT requires the transmission of electrical energy between the stator and rotor. Traditional slip rings, using contact carbon brushes, suffer from problems such as easy deformation under high and low temperature operating conditions, difficulty in integrated molding, and the tendency to accumulate dust, carbon, and heat during high-speed operation. Non-contact slip rings, employing wireless power transmission technology, transform power transmission from power frequency conduction to high-frequency magnetic coupling, overcoming the shortcomings of traditional carbon brush slip rings and representing a current focus of technological research. However, because wireless power transmission devices transmit high-frequency electrical energy, they introduce electromagnetic interference (EMI) problems. EMI can affect the communication and interaction of imaging equipment, cause image distortion, and excessive magnetic flux density at the rotation center can be harmful to the human body. Furthermore, the metal components of the patient bed can experience eddy current effects leading to heat generation. Additionally, for wireless power transmission devices using multiple slip rings, the magnetic fields of the multiple coils couple with each other, affecting the stability of high-frequency electrical energy transmission. Summary of the Invention

[0003] The technical problem to be solved by this disclosure is to overcome the defects of electromagnetic interference in the non-contact transmission method using wireless power transmission devices in the prior art, and to provide an X-ray imaging device and a wireless power transmission device with electromagnetic shielding function.

[0004] This disclosure solves the above-mentioned technical problems through the following technical solution:

[0005] In a first aspect, a wireless power transmission device is provided, comprising:

[0006] A first ring structure, wherein a first frame is fixedly mounted on the first ring structure, and a first winding is wound around the first frame;

[0007] A second annular structure is provided, on which a second frame is fixed, and on which a second winding is wound; wherein, the second annular structure is rotatable relative to the first annular structure;

[0008] A metal shielding assembly is disposed relative to the first winding and / or the second winding.

[0009] Optionally, a first frame with the first winding wound is fixed to a first side of the first annular structure along the axial direction;

[0010] The metal shielding assembly includes a first metal shielding plate, which is disposed on the second side of the first annular structure along the axial direction.

[0011] And / or, the metal shielding assembly includes a second metal shielding plate; a second skeleton with the second winding wound around it is fixed to a first side of the second annular structure along the axial direction, and the second metal shielding plate is disposed on a second side of the second annular structure along the axial direction;

[0012] And / or, the metal shielding assembly includes a first metal shielding ring structure; the wireless power transmission device includes a plurality of first windings, the plurality of first windings being deployed along a circumference of the first annular structure to form a power ring, and the first metal shielding ring structure being fitted onto at least a circumference of the power ring; wherein the axis of the power ring coincides with the axis of the first annular structure.

[0013] Optionally, when the metal shielding assembly includes the first metal shielding ring structure and the first metal shielding plate, the first side of the first metal shielding ring structure along the axial direction is seamlessly connected to the first metal shielding plate.

[0014] In the case where the metal shielding assembly includes the first metal shielding ring structure and the second metal shielding plate, the second side of the first metal shielding ring structure along the axial direction is seamlessly connected to the second metal shielding plate.

[0015] Optionally, a magnetic core assembly is also mounted on a first side of the first annular structure along the axial direction. The magnetic core assembly includes at least one magnetic core, the first winding passes through a window of the magnetic core, and the second frame passes through the air gap of the magnetic core and is fixed to the second annular structure.

[0016] The area of ​​the first metal shielding plate projected along the axial direction is greater than or equal to the projected area of ​​the magnetic core on the side of the first metal shielding plate along the axial direction.

[0017] And / or, the area of ​​the second metal shielding plate projected along the axial direction is greater than or equal to the projected area of ​​the magnetic core on the side of the second metal shielding plate along the axial direction.

[0018] And / or, the radial projection area of ​​the first metal shielding ring structure is greater than or equal to the projected area of ​​the magnetic core on the circumferential surface of the first metal shielding ring structure.

[0019] Optionally, the first frame on which the first winding is wound is located on one circumference of the first annular structure; the metal shielding assembly includes a second metal shielding ring structure; the second metal shielding ring structure is sleeved on the other circumference of the first annular structure;

[0020] And / or, both circumferential surfaces of the first annular structure are provided with a first skeleton, each circumferential surface of the first annular structure is provided with a second annular structure opposite to it, and a second skeleton is fixed to one circumferential surface of each second annular structure relative to the first skeleton; the metal shielding assembly includes a third metal shielding ring structure; at least one second annular structure is fitted with a third metal shielding ring structure on the other circumferential surface.

[0021] And / or, the metal shielding assembly includes a third metal shielding plate; the third metal shielding plate is disposed opposite to the axial side of the first annular structure.

[0022] Optionally, when the metal shielding assembly includes the second metal shielding ring structure and the third metal shielding plate, the side of the second metal shielding ring structure along the axial direction is seamlessly connected to the third metal shielding plate;

[0023] In the case where the metal shielding assembly includes the third metal shielding ring structure and the third metal shielding plate, the side of the third metal shielding ring structure along the axial direction is seamlessly connected to the third metal shielding plate.

[0024] Optionally, the area of ​​the third metal shielding plate projected along the axial direction is greater than or equal to the projected area of ​​the magnetic core on the axial side of the third metal shielding plate.

[0025] And / or, the radial projection area of ​​the second metal shielding ring structure is greater than or equal to the projected area of ​​the magnetic core on the circumferential surface of the second metal shielding ring structure;

[0026] And / or, the radial projection area of ​​the third metal shielding ring structure is greater than or equal to the projected area of ​​the magnetic core on the circumferential surface of the third metal shielding ring structure.

[0027] Optionally, the metal shielding component is made of aluminum;

[0028] And / or, a magnetic core assembly is further mounted on a first side of the first annular structure along the axial direction, the magnetic core assembly including at least one magnetic core, the first winding passing through a window of the magnetic core, and the second skeleton passing through an air gap of the magnetic core and fixed to the second annular structure; the thickness of the metal shielding assembly is negatively correlated with the number of magnetic cores; and / or, the first annular structure is used for fixed connection with a frame, the first annular structure being located on the stationary side of the frame.

[0029] In a second aspect, an X-ray imaging device is provided, comprising a wireless power transmission device and a frame as described in any one of the first aspects, wherein a first annular structure is fixedly connected to the frame, the first annular structure is located on the stationary side of the frame, and a second annular structure is located on the rotating side of the frame.

[0030] Optionally, it further includes: a power distribution device; the power distribution device is connected to the first winding.

[0031] Based on common knowledge in the field, the above-mentioned preferred conditions can be combined arbitrarily to obtain various preferred embodiments of this disclosure.

[0032] The positive and progressive effects of this disclosure are as follows: In this disclosure, a metal shielding component is added to the wireless power transmission device, which can weaken the main magnetic flux of the wireless power transmission device by utilizing the eddy current effect of the metal material, reduce the leakage of magnetic lines of force, thereby reducing electromagnetic interference, and thus reducing the impact of electromagnetic interference on the communication interaction of X-ray imaging equipment, reducing image distortion of X-ray imaging equipment during the scanning process, while also reducing the harm to the human body caused by excessive magnetic flux density at the rotation center of the wireless power transmission device and alleviating the heat generation problem caused by the eddy current effect. Attached Figure Description

[0033] Figure 1a A schematic diagram illustrating the effect of magnetic field lines generated by a wireless power transmission device without an additional metal shielding component, provided as an exemplary embodiment of this disclosure;

[0034] Figure 1b A schematic diagram illustrating the effect of magnetic field lines generated by another wireless power transmission device without an additional metal shielding component, provided as an exemplary embodiment of this disclosure.

[0035] Figure 1c An axial schematic diagram of a wireless power transmission device without an additional metal shielding component, provided as an exemplary embodiment of this disclosure;

[0036] Figure 2 A schematic diagram of the structure of a wireless power transmission device with an added metal shielding component provided as an exemplary embodiment of this disclosure;

[0037] Figure 3 A schematic diagram of another wireless power transmission device with an added metal shielding component provided as an exemplary embodiment of the present disclosure;

[0038] Figure 4 A schematic diagram of another wireless power transmission device with an added metal shielding component provided as an exemplary embodiment of the present disclosure;

[0039] Figure 5 A schematic diagram of another wireless power transmission device with an added metal shielding component provided as an exemplary embodiment of the present disclosure;

[0040] Figure 6 A schematic diagram of another wireless power transmission device with an added metal shielding component provided as an exemplary embodiment of the present disclosure;

[0041] Figure 7 A schematic diagram of another wireless power transmission device with an added metal shielding component provided as an exemplary embodiment of the present disclosure;

[0042] Figure 8 A schematic diagram of another wireless power transmission device with an added metal shielding component provided as an exemplary embodiment of the present disclosure;

[0043] Figure 9 A schematic diagram of another wireless power transmission device with an added metal shielding component provided as an exemplary embodiment of the present disclosure;

[0044] Figure 10 A schematic diagram of another wireless power transmission device with an added metal shielding component provided as an exemplary embodiment of the present disclosure;

[0045] Figure 11 A schematic diagram of another wireless power transmission device with an added metal shielding component provided as an exemplary embodiment of the present disclosure;

[0046] Figure 12 A schematic diagram of another wireless power transmission device with an added metal shielding component provided as an exemplary embodiment of the present disclosure;

[0047] Figure 13 A schematic diagram of another wireless power transmission device with an added metal shielding component provided as an exemplary embodiment of the present disclosure;

[0048] Figure 14 A schematic diagram of another wireless power transmission device with an added metal shielding component provided as an exemplary embodiment of the present disclosure;

[0049] Figure 15 A schematic diagram of another wireless power transmission device with an added metal shielding component provided as an exemplary embodiment of the present disclosure;

[0050] Figure 16 A schematic diagram of another wireless power transmission device with an added metal shielding component provided as an exemplary embodiment of the present disclosure;

[0051] Figure 17 A schematic diagram of another wireless power transmission device with an added metal shielding component provided as an exemplary embodiment of the present disclosure;

[0052] Figure 18 This is a schematic diagram of another wireless power transmission device with an added metal shielding component, provided as an exemplary embodiment of the present disclosure. Detailed Implementation

[0053] The present disclosure is further illustrated below by way of embodiments, but the present disclosure is not limited to the scope of the embodiments described herein.

[0054] The prefixes such as "first" and "second" used in this disclosure are merely for distinguishing different descriptive objects and do not limit the position, order, priority, quantity, or content of the described objects. The use of ordinal numbers and other prefixes used to distinguish descriptive objects in this disclosure does not constitute a limitation on the described objects. The description of the described objects is given in the context of the embodiments, and the use of such prefixes should not constitute unnecessary restrictions. Furthermore, in the description of this embodiment, unless otherwise stated, "multiple" means two or more.

[0055] This disclosure provides a wireless power transmission device, see [link to relevant documentation] Figure 2-18 The wireless power transmission device includes a first ring structure 10, a second ring structure 13, and a metal shielding assembly. A first frame 11 is fixed to the first ring structure 10, and a first winding 12 is wound around the first frame 11. A second frame 14 is fixed to the second ring structure 13, and a second winding 15 is wound around the second frame 14. The first winding 12 and the second winding 15 are arranged facing each other, and the second ring structure 13 is rotatable relative to the first ring structure 10. The metal shielding assembly is disposed relative to the first winding and / or the second winding. The metal shielding assembly can generate a reverse magnetic field based on the eddy current effect to weaken the main magnetic flux of the wireless power transmission device.

[0056] In this embodiment, adding a metal shielding component to the wireless power transmission device can reduce the magnetic field strength by utilizing the eddy current effect of the metal material. By changing the return path of the magnetic field lines, the electromagnetic interference problem can be weakened, thereby reducing the impact of electromagnetic interference on the communication interaction of the X-ray imaging equipment, reducing image distortion of the X-ray imaging equipment during the scanning process, and also reducing the harm to the human body caused by excessive magnetic flux density at the rotation center of the wireless power transmission device and alleviating the heat generation problem caused by the eddy current effect.

[0057] In one embodiment, a magnetic core assembly is mounted on a first side T1 along the axial direction of a first annular structure 10. The magnetic core assembly includes at least one magnetic core 16, and a first winding 12 passes through a window 161 of the magnetic core 16 in the magnetic core assembly. A second frame 14 is fixed on a first side T3 along the axial direction of a second annular structure 13, and a second winding 15 is wound on the second frame 14, passing through the window 161 of the magnetic core 16 in the magnetic core assembly. A gap exists between the first winding 12 and the second winding 15 located on the same magnetic core 16.

[0058] The first annular structure 10 includes two axially oriented side surfaces. The first side surface T1 is the side surface closer to the second annular structure 13, and the second side surface is the side surface farther from the second annular structure 13. The second annular structure 13 also includes two axially oriented side surfaces. The first side surface T3 is the side surface closer to the first annular structure 10, and the second side surface T4 is the side surface farther from the first annular structure 10. The axially oriented side surfaces of the annular structures are also the planes intersecting with the circumferential surface S (including the inner and outer circumferential surfaces) of the annular structures, or the extreme surfaces of the circumferential surface S. The circumferential S is also the closed curved surface of the annular structure.

[0059] The axial directions of the first ring structure 10 and the second ring structure 13 are parallel to or coincide with the rotation axis of the wireless power transmission device. The axial directions of the first ring structure 10 and the second ring structure 13 are also... Figure 1b and Figure 1c The Y-axis direction, radial direction, is... Figure 1b and Figure 1c The X-axis or Z-axis direction, and the circumferential direction, which is the rotation direction of the annular structure on the rotating side.

[0060] In one embodiment, the wireless power transmission device further includes a rack. A first annular structure 10 is fixedly connected to the rack, and a second annular structure 13 is rotatable relative to the first annular structure 10. In a specific embodiment, the first annular structure 10 is located on the stationary side of the rack, and the second annular structure 13 is located on the rotating side of the rack. During the operation of the wireless power transmission device, the second annular structure 13 rotates with the rack, realizing relative rotation between the first annular structure 10 and the second annular structure 13.

[0061] In this embodiment, the magnetic core is fixed to the first annular structure on the stationary side, rather than to the second annular structure on the rotating side. The magnetic core does not rotate with the second annular structure on the rotating side, thereby reducing the weight of the second annular structure and increasing its rotational speed. Furthermore, the fixed nature of the magnetic core ensures a stable magnetic field, which in turn ensures stable power transmission.

[0062] In one embodiment, see Figure 2 The magnetic core assembly is located on the first side T1 along the axial direction of the first annular structure 10, that is, the magnetic core 16 is located on the first side T1 along the axial direction of the first annular structure 10. In order to shield electromagnetic interference, the metal shielding assembly includes a first metal shielding plate 21 located on the second side T2 along the axial direction of the first annular structure 10.

[0063] See Figure 1a and Figure 1b In wireless power transmission devices without metal shielding, the magnetic field lines (represented by dashed lines with arrows in the diagram) are widely distributed and numerous. See also... Figure 2After setting the first metal shielding plate 21, the outward expansion of magnetic field lines towards the first metal shielding plate 21 can be weakened, thereby achieving the purpose of shielding electromagnetic interference. Since the magnetic core of the first annular structure 10 on the stator side is closed, the magnetic field lines have the strongest binding ability. Adding the first metal shielding plate 21 to the second side T2 along the axial direction of the first annular structure 10 can significantly attenuate the strength of the surrounding magnetic field, thereby achieving the purpose of effectively shielding electromagnetic interference.

[0064] It should be noted that the metal shielding assembly may include multiple magnetic cores 16, which may be randomly installed on the first side T1 along the axial direction of the first annular structure 10. Alternatively, the multiple magnetic cores 16 may be evenly installed on the first side T1 along the axial direction of the first annular structure 10. When the multiple magnetic cores 16 are evenly installed on the first side T1 along the axial direction of the first annular structure 10, the first frame 11, the first winding 12, and the second frame 14 corresponding to the same magnetic core 16 are also all evenly installed, thereby ensuring uniform force distribution on the wireless power transmission device and improving its stability during operation.

[0065] See Figure 2 Multiple first windings 12 can be circumferentially mounted in a circle on the first side T1 of the annular structure along the axial direction to form a power ring; see [link to relevant documentation]. Figure 3 , 5 7, 9-14, multiple first windings 12 can also be circumferentially mounted on the first side surface T1 of the annular structure along the axial direction in the shape of two circles of different diameters to form two power rings. Multiple first windings 12 can also be circumferentially mounted on the first side surface T1 of the annular structure along the axial direction in the shape of more circles of different diameters to form multiple power rings. This disclosure does not particularly limit the mounting method of the magnetic core 16. It is understood that the first frame 11, the second frame 14, and the magnetic core 16 corresponding to the first windings 12 can also be circumferentially mounted in the shape of one circle, two circles, or multiple circles.

[0066] In one embodiment, when the metal shielding assembly includes multiple magnetic cores 16, there are correspondingly multiple first windings and multiple second windings, which can be divided into main windings and auxiliary windings. Specifically, a portion of the multiple first windings are used as main windings, and the remaining first windings are used as auxiliary windings; a portion of the multiple second windings are used as main windings, and the remaining second windings are used as auxiliary windings. For example, see... Figure 3 , 5 In diagrams 7 and 9-14, the first winding 12a and the second winding 15a are the main windings, and the first winding 12b and the second winding 15b are the auxiliary windings. In other implementations, the first winding 12a and the second winding 15a can also be used as auxiliary windings, and the first winding 12b and the second winding 15b can be used as main windings.

[0067] The size of the first metal shielding plate 21 is positively correlated with its electromagnetic interference immunity. In one embodiment, the area projected along the axial direction of the first metal shielding plate 21 is greater than or equal to the sum of the projected areas of each magnetic core 16 on the axial side surface of the first metal shielding plate 21. See also Figure 3 When the axial projection area of ​​the first metal shielding plate 21 is greater than the sum of the axial projection areas of the magnetic cores corresponding to the first winding 12a, the second winding 15a, the first winding 12b, and the second winding 15b, the magnetic cores corresponding to the second winding 15b, on the side of the first metal shielding plate 21, it can effectively reduce electromagnetic interference.

[0068] In one embodiment, the thickness of the first metal shielding plate 21 is negatively correlated with the number of magnetic cores. If the number of magnetic cores is small, the ability of the first metal shielding plate 21 to weaken electromagnetic interference can be enhanced by increasing the thickness of the first metal shielding plate 21.

[0069] To alleviate winding overheating during long-term, high-power operation of CT scanners, facilitate installation and maintenance, and save costs, the number of magnetic cores can be reduced. A fewer-core design significantly reduces costs, simplifies installation and maintenance, and allows for greater space between cores to improve heat exchange efficiency, ensuring high-power, long-term operation of the X-ray imaging device. However, reducing the number of cores means their dispersed deployment. Dispersed cores reduce the binding force on magnetic field lines, resulting in a longer closed path for the magnetic field lines.

[0070] In this embodiment, the thickness of the first metal shielding plate 21 is determined according to the number of magnetic cores. On the one hand, it can enhance the electromagnetic interference capability, and on the other hand, it can effectively solve the problem of winding overheating.

[0071] In one embodiment, the metal shielding assembly includes a second metal shielding plate 22; a second frame 14 is fixed to a first side T3 along the axial direction of the second annular structure 13, and the second metal shielding plate 22 is disposed on a second side T4 along the axial direction of the second annular structure 13.

[0072] In one embodiment, the connection portion between the rack and the fixing structure of the second annular structure 13 is designed as an annular structure to serve as the second metal shielding plate 22. In other implementations, if structural reasons prevent the rack from covering a small area or from being too far from the magnetic core, a separate metal shielding plate can be added.

[0073] Similar to the first metal shielding plate 21, the area of ​​the second metal shielding plate 22 projected along the axial direction is greater than or equal to the sum of the projected areas of each magnetic core 16 on the side surface of the second metal shielding plate 22 along the axial direction.

[0074] In one embodiment, the thickness of the second metal shield 22 is negatively correlated with the number of magnetic cores. If the number of magnetic cores is small, the ability of the second metal shield 22 to weaken electromagnetic interference can be enhanced by increasing the thickness of the second metal shield 22.

[0075] In one embodiment, see Figure 2 Meanwhile, a first metal shielding plate 21 is provided in the first annular structure 10 and a second metal shielding plate 22 is provided in the second annular structure 13, which can effectively weaken the external magnetic field strength.

[0076] In one embodiment, see Figure 4-14 The metal shielding assembly includes a first metal shielding ring structure 23. When the wireless power transmission device includes a magnetic core 16, the first metal shielding ring structure 23 is fitted onto at least one circumferential surface L of the magnetic core 16. When the wireless power transmission device does not include a magnetic core 16, the first metal shielding ring structure 23 is fitted onto at least one circumferential surface of the power ring, which is formed by a plurality of first windings 12 circumferentially deployed on a first side surface T1 along the axial direction of the first annular structure 10.

[0077] In one embodiment, see Figure 4 Multiple magnetic cores 16 are circumferentially mounted on the first side T1 of the first annular structure along the axial direction to form a power ring. A first metal shielding ring structure 23 is fitted onto the inner circumferential surface of the power ring, that is, the first metal shielding ring structure 23 is located within the through hole H formed on the inner circumferential surface of the power ring. The diameter of the inner circumferential surface of the power ring is smaller than the diameter of the outer circumferential surface of the power ring.

[0078] In other implementations, the first metal shielding ring structure 23 is sleeved on the outer peripheral surface of the power ring, or a first metal shielding ring structure 23 is sleeved on the inner peripheral surface and the outer peripheral surface of the magnetic core 16, respectively.

[0079] In one embodiment, a plurality of magnetic cores 16 are mounted circumferentially on a first side T1 of the first annular structure along the axial direction in at least two circles of different diameters, with the magnetic cores 16 on each circle forming a power ring. Figure 5 Taking the dual-power ring shown as an example (multiple magnetic cores 16 are mounted circumferentially on the first side surface T1 of the first annular structure along the axial direction in two circles with different diameters), all the magnetic cores corresponding to the first winding 12a and the second winding 15a form a power ring, and all the magnetic cores corresponding to the first winding 12b and the second winding 15b form a power ring. A first metal shielding ring structure 23 is provided between the magnetic cores corresponding to the first winding 12a and the second winding 15a and the magnetic cores corresponding to the first winding 12b and the second winding 15b, that is, the first metal shielding ring structure 23 is sleeved on the inner circumference of the magnetic cores corresponding to the first winding 12a and the second winding 15a or on the outer circumference of the magnetic cores corresponding to the first winding 12b and the second winding 15b.

[0080] For wireless power transmission devices containing multiple power rings, the close proximity of the power rings due to device size limitations leads to coupling issues. In this embodiment, a first metal shielding ring structure is placed between two adjacent power rings, which not only weakens electromagnetic interference but also reduces the coupling between adjacent power rings.

[0081] In other implementations, a first metal shielding ring structure 23 may be fitted onto the outer circumference of the magnetic cores corresponding to the first winding 12a and the second winding 15a, and / or the inner circumference of the magnetic cores corresponding to the first winding 12b and the second winding 15b, respectively.

[0082] In one embodiment, the thickness of the first metal shielding ring structure 23 is negatively correlated with the number of magnetic cores. If the number of magnetic cores is small, the ability of the first metal shielding ring structure 23 to weaken electromagnetic interference can be enhanced by increasing its thickness.

[0083] To alleviate winding overheating during long-term, high-power operation of CT scanners, facilitate installation and maintenance, and save costs, the number of magnetic cores can be reduced. A fewer-core design significantly reduces costs, simplifies installation and maintenance, and allows for greater space between cores to improve heat exchange efficiency, ensuring high-power, long-term operation of the X-ray imaging device. However, reducing the number of cores means their dispersed deployment. Dispersed cores reduce the binding force on magnetic lines of force, resulting in longer closed-loop paths. Furthermore, in multi-power-loop structures, adjacent power loops can couple and interfere with each other's operation.

[0084] Based on this, in this embodiment, by increasing the thickness of the first metal shielding ring structure 23, the ability of the first metal shielding ring structure 23 to weaken electromagnetic interference is enhanced and the coupling between two adjacent power rings is further reduced.

[0085] The first metal shielding ring structure 23 can be fixed on the first side T1 along the axial direction of the first annular structure 10, or the first metal shielding ring structure 23 can be fixed on the frame.

[0086] See Figure 6 , Figure 7 When the metal shielding assembly includes both a first metal shielding plate 21 and a first metal shielding ring structure 23, the first metal shielding ring structure 23 can be fixed to the first metal shielding plate 21, and the cross-section of the metal shielding assembly is L-shaped. Preferably, the first metal shielding ring structure is seamlessly connected to the first metal shielding plate along the axial direction and close to the side of the first metal shielding plate, thereby ensuring the integrity of the metal shielding assembly, preventing electromagnetic leakage through the gaps in the metal shielding assembly, and further improving the ability of the metal shielding assembly to weaken electromagnetic interference.

[0087] When the metal shielding assembly includes both a second metal shielding plate 22 and a first metal shielding ring structure 23, the first metal shielding ring structure 23 can be fixed to the second metal shielding plate 22, in which case the cross-section of the metal shielding assembly is L-shaped. Preferably, the first metal shielding ring structure is seamlessly connected to the second metal shielding plate along the axial direction and close to the side of the second metal shielding plate, thereby further improving the ability of the metal shielding assembly to weaken electromagnetic interference.

[0088] See Figure 8 , Figure 9 When the metal shielding assembly includes a first metal shielding plate 21, a second metal shielding plate 22, and a first metal shielding ring structure 23, the two sides of the first metal shielding ring structure 23 along the axial direction can be fixed to the first metal shielding plate 21 and the second metal shielding plate 22 respectively. At this time, the cross-section of the metal shielding assembly is U-shaped.

[0089] See Figure 10 When the metal shielding assembly includes both a first metal shielding plate 21 and a first metal shielding ring structure 23, and the first metal shielding ring structure 23 is located between two power rings (the power ring formed by the magnetic cores corresponding to the first winding 12a and the second winding 15a, and the power ring formed by the magnetic cores corresponding to the first winding 12b and the second winding 15b), the end of the first metal shielding ring structure 23 closest to the first annular structure 10 can pass through the through hole on the first annular structure 10 and be fixed to the first metal shielding plate 21. At this time, the cross-section of the metal shielding assembly is T-shaped.

[0090] In other implementations, when the metal shielding assembly includes both a second metal shielding plate 22 and a first metal shielding ring structure 23, and the first metal shielding ring structure 23 is located between two power rings, the end of the first metal shielding ring structure 23 near the second annular structure 13 can pass through a through hole in the second annular structure 13 and be fixed to the second metal shielding plate 22. In this case, the cross-section of the metal shielding assembly is T-shaped. The specific implementation method is similar to... Figure 10 Similarly, this will not be elaborated upon here.

[0091] See Figure 11 The wireless power transmission device includes dual power rings. When the metal shielding assembly simultaneously includes a first metal shielding plate 21, a second metal shielding plate 22, and a first metal shielding ring structure 23, with the first metal shielding ring structure 23 located between the two power rings, the first metal shielding ring structure 23 can be simultaneously fixed to both the first metal shielding plate 21 and the second metal shielding plate 22. In this case, the cross-section of the metal shielding assembly is H-shaped. This shape of the metal shielding assembly not only increases the closed path of the coupling magnetic field lines of each power ring, but also significantly attenuates the magnetic field strength of the outer magnetic field lines after passing through the metal shielding plate, thus reducing the coupling between the two power rings. This embodiment simultaneously solves the problems of excessive central magnetic flux density and coupling between adjacent power rings.

[0092] See Figure 12 The wireless power transmission device includes dual power rings. When the metal shielding assembly includes a first metal shielding plate 21, a second metal shielding plate 22, and two metal shielding ring structures 23, and the two metal shielding ring structures 23 are respectively sleeved on the inner circumferential surface of the power ring with a smaller diameter and between the two power rings, the two metal shielding ring structures 23 can be fixed on the first metal shielding plate 21 and the second metal shielding plate 22 at the same time.

[0093] It should be noted that the first metal shielding plate 21, the second metal shielding plate 22, and the first metal shielding ring structure 23 can be combined according to actual needs to achieve the desired electromagnetic interference shielding. For other implementation methods, see [link to relevant documentation]. Figure 13 and Figure 14 The cross-section of the metal shielding assembly can also be F-type or E-type. The E-type metal shielding assembly forms a semi-enclosed metal shielding plate, which can significantly reduce the central magnetic flux density.

[0094] Understandably, because the magnetic core has a high permeability and the strongest ability to bind magnetic lines of force, adding a metal shielding plate and / or a metal shielding ring structure to the closed surface of the magnetic core can effectively reduce electromagnetic interference.

[0095] In one embodiment, see Figure 15-17 The magnetic core is located on the first circumferential surface of the first annular structure 10, that is, the first frame 11, on which the first winding 12 is wound, is located on the first circumferential surface of the first annular structure 10; the metal shielding assembly includes a second metal shielding ring structure 24; the second metal shielding ring structure 24 is sleeved on the second circumferential surface of the first annular structure 10. The first circumferential surface of the first annular structure 10 can be its inner circumferential surface, and correspondingly, the second circumferential surface of the first annular structure 10 is its outer circumferential surface.

[0096] In one embodiment, the second frame 14, on which the second winding 15 is wound, is located on the first circumferential surface of the second annular structure 13, and the second winding 15 is arranged facing the first winding 12. That is, when the first winding 12 is located on the inner circumferential surface of the first annular structure 10 and the second winding 15 is located on the outer circumferential surface of the second annular structure 13, the outer circumferential surface of the second annular structure 13 is its first circumferential surface, and the inner circumferential surface of the second annular structure 13 is its second circumferential surface. A second metal shielding ring structure can be fitted on the second circumferential surface (inner circumferential surface) of the second annular structure 13. When the first winding 12 is located on the outer circumferential surface of the first annular structure 10 and the second winding 15 is located on the inner circumferential surface of the second annular structure 13, the inner circumferential surface of the second annular structure 13 is its first circumferential surface, and the outer circumferential surface of the second annular structure 13 is its second circumferential surface. A second metal shielding ring structure can be fitted on the second circumferential surface (outer circumferential surface) of the second annular structure 13.

[0097] In one embodiment, see Figure 18 The first annular structure 10 has magnetic cores on both circumferential surfaces, that is, magnetic cores and first skeletons are provided on both the inner and outer circumferential surfaces of the first annular structure 10. Correspondingly, two second annular structures 13 are provided, and the first circumferential surface of each second annular structure 13 is fixed with a second skeleton relative to the first skeleton. The metal shielding assembly includes a third metal shielding ring structure 25. At least one second annular structure 13 has a third metal shielding ring structure 25 fitted on its second circumferential surface. Figure 18 In this embodiment, a third metal shielding ring structure 25 is fitted on the second circumferential surface of each of the two second annular structures 13. In other implementations, a third metal shielding ring structure 25 may be fitted only on the outer circumferential surface of the second annular structure 13 with a larger diameter, or only on the inner circumferential surface of the second annular structure 13 with a smaller diameter.

[0098] In one embodiment, see Figure 15-18 The metal shielding assembly includes a third metal shielding plate 26; the first annular structure 10 is provided with the third metal shielding plate 26 opposite to the first side and / or the second side along the axial direction.

[0099] It should be noted that, in practical applications, the second metal shielding ring structure 24, the third metal shielding ring structure 25, and the third metal shielding plate 26 are not limited to... Figure 15-18 The three components shown can be used in combination: the second metal shielding ring structure 24, the third metal shielding ring structure 25, and the third metal shielding plate 26 can be used independently or in combination of two.

[0100] In one embodiment, the side of the second metal shielding ring structure 24 along the axial direction is seamlessly connected to the third metal shielding plate 26.

[0101] In one embodiment, the side of the third metal shielding ring structure 25 along the axial direction is seamlessly connected to the third metal shielding plate 26.

[0102] In one embodiment, the area of ​​the third metal shield 26 projected along the axial direction is greater than or equal to the projected area of ​​the magnetic core on the axial side of the third metal shield 26.

[0103] In one embodiment, the radially projected area of ​​the second metal shielding ring structure 24 is greater than or equal to the projected area of ​​the magnetic core on the circumferential surface of the second metal shielding ring structure 24.

[0104] In one embodiment, the radially projected area of ​​the third metal shielding ring structure 25 is greater than or equal to the projected area of ​​the magnetic core on the circumferential surface of the third metal shielding ring structure 25.

[0105] The specific implementation methods of the second metal shielding ring structure 24, the third metal shielding ring structure 25 and the third metal shielding plate 26 are similar to those of the first metal shielding plate 21, the second metal shielding ring structure 22 and the first metal shielding ring structure 23, and the specific implementation methods will not be described in detail here.

[0106] In one embodiment, the metal shielding component is made of aluminum. Aluminum has good electrical conductivity and high electromagnetic shielding effectiveness. Furthermore, aluminum is lightweight, so adding a metal shielding plate to the second annular structure (rotating side) will not significantly affect the weight of the second annular structure (rotating side) and will not affect its rotational speed.

[0107] In one embodiment, a certain gap is maintained between the first winding 12 and the second winding 15 to ensure that the first winding 12 and the second winding 15 do not come into contact with each other when they rotate relative to each other. The first winding 12 and the second winding 15 are magnetically coupled through the magnetic core 16 assembly to transfer the electrical energy received by the first winding 12 to the second winding 15.

[0108] In one embodiment, the magnetic core 16 in the magnetic core assembly has an air gap 162, and the second frame 14 passes through the air gap 162 and is fixed to the second annular structure 13. In this embodiment, the stationary winding and the rotating winding can be magnetically coupled through the magnetic core assembly and the air gap 162 of the magnetic core 16, so as to transfer the electrical energy received by the stationary winding to the rotating winding. The position of the air gap 162 in the magnetic core 16 determines the relative position between the second annular structure 13 and the first annular structure 10. Specifically, the structure of the magnetic core can be UU type, UY type, etc., and is not limited thereto.

[0109] This disclosure also provides an X-ray imaging device, which includes a wireless power transmission device and a frame provided in any of the above embodiments. A first annular structure is fixedly connected to the frame, the first annular structure is located on the stationary side of the frame, and the second annular structure is located on the rotating side of the frame.

[0110] Among them, X-ray imaging equipment can be CT equipment, as well as CT combined with other modal imaging equipment, such as PET-CT equipment, which combines CT with PET (positron emission tomography).

[0111] In one embodiment, the X-ray imaging device further includes a power distribution device connected to the first winding. In this case, the first annular structure corresponding to the first winding serves as the stationary side, and the second annular structure corresponding to the second winding serves as the rotating side.

[0112] While specific embodiments of this disclosure have been described above, those skilled in the art should understand that these are merely illustrative examples, and the scope of protection of this disclosure is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of this disclosure, but all such changes and modifications fall within the scope of protection of this disclosure.

Claims

1. A wireless power transmission device with electromagnetic shielding function, characterized in that, include: A first ring structure, wherein a first frame is fixedly mounted on the first ring structure, and a first winding is wound around the first frame; The second ring structure has a second frame fixed on it, and a second winding is wound around the second frame; wherein the first winding and the second winding are arranged facing each other, and the second ring structure is rotatable relative to the first ring structure. A metal shielding assembly is disposed relative to the first winding and / or the second winding.

2. The wireless power transmission device according to claim 1, characterized in that, A first frame, on which the first winding is wound, is fixed to the first side of the first annular structure along the axial direction. The metal shielding assembly includes a first metal shielding plate, which is disposed on the second side of the first annular structure along the axial direction. And / or, the metal shielding assembly includes a second metal shielding plate; a second skeleton with the second winding wound around it is fixed to a first side of the second annular structure along the axial direction, and the second metal shielding plate is disposed on a second side of the second annular structure along the axial direction; And / or, the metal shielding assembly includes a first metal shielding ring structure; the wireless power transmission device includes a plurality of first windings, the plurality of first windings being circumferentially deployed on a first side of the first annular structure along the axial direction to form a power ring, and the first metal shielding ring structure being fitted around at least one circumferential surface of the power ring; wherein, the axis of the power ring coincides with the axis of the first annular structure.

3. The wireless power transmission device according to claim 2, characterized in that, In the case where the metal shielding assembly includes the first metal shielding ring structure and the first metal shielding plate, the first metal shielding ring structure is seamlessly connected to the first metal shielding plate along the axial direction and close to the side of the first metal shielding plate. In the case where the metal shielding assembly includes the first metal shielding ring structure and the second metal shielding plate, the first metal shielding ring structure is seamlessly connected to the second metal shielding plate along the axial direction and close to the side of the second metal shielding plate.

4. The wireless power transmission device according to claim 2 or 3, characterized in that, A magnetic core assembly is also mounted on a first side of the first annular structure along the axial direction. The magnetic core assembly includes at least one magnetic core. The first winding passes through a window of the magnetic core, and the second frame passes through the air gap of the magnetic core and is fixed to the second annular structure. The area of ​​the first metal shielding plate projected along the axial direction is greater than or equal to the projected area of ​​the magnetic core on the side of the first metal shielding plate along the axial direction. And / or, the area of ​​the second metal shielding plate projected along the axial direction is greater than or equal to the projected area of ​​the magnetic core on the side of the second metal shielding plate along the axial direction. And / or, the radially projected area of ​​the first metal shielding ring structure is greater than or equal to the projected area of ​​the magnetic core on the circumferential surface of the first metal shielding ring structure.

5. The wireless power transmission device according to claim 1, characterized in that, A first frame with the first winding wound is located on the first circumferential surface of the first annular structure; the metal shielding assembly includes a second metal shielding ring structure; the second metal shielding ring structure is sleeved on the second circumferential surface of the first annular structure and / or the first circumferential surface of the second annular structure; the second frame is fixedly mounted on the second circumferential surface of the second annular structure. And / or, each circumferential surface of the first annular structure is provided with a first skeleton, and each circumferential surface of the first annular structure is provided with a second annular structure opposite to it, and the first circumferential surface of each second annular structure is fixed with a second skeleton relative to the first skeleton; the metal shielding assembly includes a third metal shielding ring structure; at least one second circumferential surface of the second annular structure is fitted with a third metal shielding ring structure; And / or, the metal shielding assembly includes a third metal shielding plate; the third metal shielding plate is disposed opposite to the first side and / or the second side of the first annular structure along the axial direction.

6. The wireless power transmission device according to claim 5, characterized in that, In the case where the metal shielding assembly includes the second metal shielding ring structure and the third metal shielding plate, the side of the second metal shielding ring structure along the axial direction is seamlessly connected to the third metal shielding plate. In the case where the metal shielding assembly includes the third metal shielding ring structure and the third metal shielding plate, the side of the third metal shielding ring structure along the axial direction is seamlessly connected to the third metal shielding plate.

7. The wireless power transmission device according to claim 5 or 6, characterized in that, A magnetic core assembly is also mounted on a first side of the first annular structure along the axial direction. The magnetic core assembly includes at least one magnetic core. The first winding passes through a window of the magnetic core, and the second frame passes through the air gap of the magnetic core and is fixed to the second annular structure. The area of ​​the third metal shielding plate projected along the axial direction is greater than or equal to the projected area of ​​the magnetic core on the side of the third metal shielding plate along the axial direction. And / or, the radially projected area of ​​the second metal shielding ring structure is greater than or equal to the projected area of ​​the magnetic core on the circumferential surface of the second metal shielding ring structure; And / or, the radially projected area of ​​the third metal shielding ring structure is greater than or equal to the projected area of ​​the magnetic core on the circumferential surface of the third metal shielding ring structure.

8. The wireless power transmission device according to any one of claims 1-3, 5, and 6, characterized in that, The metal shielding component is made of aluminum; And / or, a magnetic core assembly is further mounted on a first side of the first annular structure along the axial direction, the magnetic core assembly including at least one magnetic core, the first winding passing through a window of the magnetic core, and the second frame passing through an air gap in the magnetic core and fixed to the second annular structure; the thickness of the metal shielding assembly is negatively correlated with the number of magnetic cores; And / or, the first annular structure is used for fixed connection with the frame, and the first annular structure is located on the stationary side of the frame.

9. An X-ray imaging device, characterized in that, The device includes a wireless power transmission device and a rack as described in any one of claims 1-8, wherein a first annular structure is fixedly connected to the rack, the first annular structure is located on the stationary side of the rack, and a second annular structure is located on the rotating side of the rack.

10. The X-ray imaging apparatus according to claim 9, characterized in that, Also includes: A power distribution device; the power distribution device is connected to the first winding.

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