A high voltage through-wall dynamic power transmission system

Abstract

The application discloses a high-voltage dynamic power transmission system, and relates to the technical field of high-voltage power transmission equipment, which comprises a shell, a stator-side high-voltage brush assembly, a rotor conductive ring, a high-voltage armored cable, a rotary sealing assembly, a double-head conductive piece, a main shaft and a rotor extension shell body. An installation opening is formed in the shell and penetrates the shell along the thickness direction of the shell, and the main shaft penetrates the installation opening. The rotary sealing assembly is arranged on the main shaft at the installation opening and is used for providing rotary support for the main shaft and sealing the installation opening. The rotor conductive ring is fixed on the main shaft in the shell. The stator-side high-voltage brush assembly is installed on the wall surface of the shell, one end of the stator-side high-voltage brush assembly is in sliding contact with the conductive surface of the rotor conductive ring, and the other end of the stator-side high-voltage brush assembly is used for electrically connecting with external equipment. The rotor extension shell body is fixedly connected with the main shaft which extends out of the installation opening. The double-head conductive piece is fixedly arranged on the wall surface of the rotor extension shell body. The application can reduce the failure risk of the rotary sealing assembly, improve the reliability of the rotary sealing assembly and reduce the maintenance cost.

Description

Technical Field

[0001] This invention relates to the field of high-voltage power transmission equipment technology, and in particular to a high-voltage through-wall dynamic power transmission system. Background Technology

[0002] In the field of high-voltage equipment, traditional through-wall power transmission systems are typically used for stationary equipment. The equipment uses bare conductors or insulated conductors as high-voltage busbars, and the interior is filled with insulating oil or insulating gas to ensure insulation performance. Applying this design concept to high-voltage rotating power transmission equipment presents the following problems:

[0003] 1. Large diameter of rotary seal assembly: Because the high-voltage bare conductor or insulated conductor passes directly through the bottom metal shell (referred to as through the wall), field strength concentration will occur, causing partial discharge. As a high-voltage connector, the double-ended conductive parts must be installed on the rotary seal assembly, and the spacing between the double-ended conductive parts must meet the requirements. This results in a large diameter of the rotary seal assembly, and the corresponding bearing and seal assembly sizes also increase, which brings great difficulty to the processing, assembly and sealing of the equipment, and the risk of failure is high.

[0004] 2. Poor reliability of rotary seals: In addition to the difficulty in molding and ensuring machining accuracy, large-size rotary seal assemblies also have a reduced lifespan. Under the same rotational speed conditions, the larger the diameter of the rotary seal assembly and the greater the linear speed, the more severe the wear of the seal will be, and the reliability will be greatly reduced.

[0005] 3. Difficulty in maintenance: The larger size leads to a shorter lifespan of the sealing assembly, which inevitably leads to the need for regular maintenance and replacement. Replacing the sealing assembly not only requires dealing with the insulating medium filling the equipment, but the difficulty of replacing the seals also increases dramatically with the larger size. Summary of the Invention

[0006] The purpose of this invention is to provide a high-voltage through-wall dynamic power transmission system to solve the problems existing in the prior art, reduce the failure risk of the rotary seal assembly, improve the reliability of the rotary seal assembly, and reduce maintenance costs.

[0007] To achieve the above objectives, the present invention provides the following solution:

[0008] This invention provides a high-voltage through-wall dynamic power transmission system, comprising: a housing, a stator-side high-voltage brush assembly, a rotor conductive ring, a high-voltage armored cable, a rotary seal assembly, a double-ended conductive element, a main shaft, and a rotor extension housing; the housing has an installation port extending along its thickness direction, and the main shaft passes through the installation port; the rotary seal assembly is sleeved on the main shaft located at the installation port, providing rotational support for the main shaft and sealing the installation port; the rotor conductive ring is fixed to the main shaft located inside the housing; the stator-side high-voltage brush assembly is mounted on the wall surface of the housing, with one end slidingly contacting the conductive surface of the rotor conductive ring, and the other end used for electrical connection with external equipment; the rotor extension housing is fixedly connected to the main shaft extending out of the installation port; the double-ended conductive element is fixedly inserted through the wall surface of the rotor extension housing; one end of the high-voltage armored cable is electrically connected to the rotor conductive ring, and the other end is electrically connected to the inner end of the double-ended conductive element; the outer end of the double-ended conductive element is used for electrical connection with another external device.

[0009] Preferably, the device further includes an insulating support assembly, which is fixedly mounted on the main shaft, and the rotor conductive ring is fixedly mounted on the insulating support assembly.

[0010] Preferably, it also includes a front connector, which is fixedly connected to one end of the high-voltage armored cable away from the rotor conductive ring, and the front connector is quick-connected to the double-ended conductive member; the outer end of the double-ended conductive member is used for quick-connection with another external device.

[0011] Preferably, the front connector includes a first conductive post disposed at the innermost layer and a semiconductor layer disposed at the outermost layer, wherein the semiconductor layer, the grounding layer of the high-voltage armored cable, and the outer shell are all electrically connected.

[0012] Preferably, the dual-headed conductive component includes a second conductive post and an insulating layer cast outside the second conductive post, wherein the insulating layer is sealed to the wall of the rotor extension housing.

[0013] Preferably, the mounting port is located at the bottom of the housing, the rotor extension housing is located below the housing, and the cross-sectional area of ​​the rotor extension housing is larger than the cross-sectional area of ​​the main shaft inside the rotary seal assembly.

[0014] Preferably, the dual-headed conductive element is fixedly disposed on the bottom wall surface of the rotor extension housing.

[0015] Preferably, the rotary sealing assembly includes a bearing, a main shaft sleeve, a body, and two sealing assemblies. Each sealing assembly includes a dynamic sealing ring and a static sealing ring. The main shaft sleeve is fixedly fitted onto the main shaft, and the body is fixedly mounted on the outer shell. The dynamic sealing rings are spaced apart along the axial direction of the main shaft sleeve and can rotate with the main shaft. One static sealing ring corresponds to one dynamic sealing ring. The static sealing ring is mounted on the body and has the freedom to move axially. Under the action of a pre-set elastic force, the static sealing ring fits against the end face of the dynamic sealing ring to form a sealing pair. A sealing cavity is constructed between the two sealing assemblies, the main shaft sleeve, and the body. The sealing cavity is used to pre-fill a separating fluid. The dynamic and static sealing rings are made of ceramic or hard alloy materials. The bearing provides rotational support for the main shaft. The bearing can be located inside or outside the sealing cavity. When the bearing is located inside the sealing cavity, it is positioned between the two sealing assemblies.

[0016] Preferably, it further includes a sliding bushing, the bearing is disposed in the sealed cavity, the sliding bushing is slidably fitted onto the outside of the main bushing along the axial direction of the main bushing, the sliding bushing is connected to the main bushing via a key; the sliding bushing and the inner ring of the bearing are fixedly connected by an interference fit, the body and the outer ring of the bearing are fixedly connected by an interference fit, the sliding bushing and the inner ring of the bearing form a rotating assembly, the rotating assembly can slide axially on the main bushing to compensate for the thermal expansion and contraction caused by temperature changes between the main bushing and the rotating assembly, at least one of the sealing assemblies has a force transmission structure between the dynamic sealing ring and the rotating assembly, and its installation method allows it to undergo axial displacement to adapt to deformation when subjected to the axial thrust generated by the thermal expansion of the rotating assembly.

[0017] Preferably, it also includes a constant pressure dynamic suppression system, which is used to supply and maintain a pressure of isolation fluid higher than that of the sealed medium to the sealed cavity.

[0018] The present invention achieves the following technical effects compared to the prior art:

[0019] First, by setting up a rotor extension housing and installing a large-diameter double-ended conductive component connected to the outside of the rotor side on the wall of the rotor extension housing, the present invention abandons the conventional method of installing the double-ended conductive component on the rotor rotating flange, which helps to reduce the diameter of the rotating seal assembly (which includes the bearing and the seal assembly), thereby overcoming all the defects caused by the excessively large diameter of the rotating seal assembly.

[0020] Secondly, this invention uses a high-voltage armored cable as the internal busbar on the rotor side. The armored cable is grounded to solve the problem that bare conductors or insulated conductors cannot directly pass through the wall, while avoiding the electrical clearance problem between the high-voltage busbar and the main shaft and rotor rotating flange.

[0021] Third, the present invention solves the problem of no grounding path in traditional high-voltage inner cone sockets through the structural design of the front connector. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the structure of a high-voltage through-wall dynamic power transmission system provided in an embodiment of the present invention;

[0024] Figure 2 for Figure 1 A sectional view;

[0025] Figure 3 This is a schematic diagram of the structure of the rotary seal assembly between the outer casing and the upper part of the main shaft in some embodiments of the present invention;

[0026] Figure 4 This is a schematic diagram of the structure of the rotary seal assembly between the outer casing and the lower part of the main shaft in some embodiments of the present invention;

[0027] Figure 5 A schematic diagram showing the connection between the rotor extension housing and the rotary connecting housing;

[0028] Figure 6 In order to be in Figure 5 A schematic diagram of the structure after adding bearings and spindle sleeves to the original structure;

[0029] Figure 7 This is a structural diagram of the stator-side high-voltage brush assembly, high-voltage armored cable, rotor conductive ring, insulation support assembly, and main shaft inside the housing.

[0030] Figure 8 for Figure 7 A magnified view of a portion at point B;

[0031] Figure 9 This is a structural diagram of a high-voltage armored cable, a rotor conductive ring, an insulation support assembly, a front connector, and a double-ended conductive component.

[0032] Figure 10This is a schematic diagram of the stator-side high-voltage brush assembly provided in an embodiment of the present invention;

[0033] Figure 11 for Figure 10 In the diagram below, after removing the equalizing ring, the stator-side high-voltage brush assembly is shown.

[0034] Figure 12 A schematic diagram of the conductor, brush fixing terminal, second spring, and brush structure;

[0035] Figure 13 for Figure 11 A sectional view;

[0036] In the diagram: 1-Stator side high-voltage brush assembly; 11-Insulating support sleeve; 12-Brush; 13-Equalizing ring; 14-Brush fixing terminal; 15-Conductor; 16-Connecting flange; 17-Brush holder; 18-Clamping component; 19-Second spring; 2-Outer shell; 3-Rotor extension shell; 41-High-voltage armored cable; 42-Front connector; 43-Double-ended conductive component; 51-Rotor conductive ring; 52-Insulating support assembly; 53-Main shaft; 531-Rotary connecting shell; 5311-Top plate; 6-Rotary sealing assembly; 61-Bearing; 62-Main shaft sleeve; 63-Body; 641-Dynamic sealing ring; 642-Static sealing ring; 64-Sealing assembly; 65-Sliding bushing; 66-Key; 67-First spring; 68-Drive ring; 8-Integrated support component; 81-Sub-support component. Detailed Implementation

[0037] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0038] The purpose of this invention is to provide a high-voltage through-wall dynamic power transmission system to solve the problems existing in the prior art, reduce the risk of rotary seal failure, improve the reliability of rotary seal, and reduce maintenance costs.

[0039] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0040] The following is combined with Figures 1 to 13 The following describes embodiments of the present invention.

[0041] This invention provides a high-voltage through-wall dynamic power transmission system, such as... Figures 1-4 , Figure 7 as well as Figure 9As shown, the assembly includes: a housing 2, a stator-side high-voltage brush assembly 1, a rotor conductive ring 51, a high-voltage armored cable 41, a rotary seal assembly 6, a double-ended conductive element 43, a main shaft 53, and a rotor extension housing 3. The housing 2 has a mounting port extending through its thickness, through which the main shaft 53 passes. The rotary seal assembly 6 is fitted onto the main shaft 53 located at the mounting port, providing rotational support for the main shaft 53 and sealing the mounting port. The rotor conductive ring 51 is fixed to the main shaft 53 located inside the housing 2. The stator-side high-voltage brush assembly 1 is mounted on the wall of the housing 2, with one end slidingly contacting the conductive surface of the rotor conductive ring 51, and the other end used for electrical connection to external equipment. The rotor extension housing 3 is fixedly connected to the main shaft 53 extending out of the mounting port. The double-ended conductive element 43 is fixedly inserted through the wall of the rotor extension housing 3. One end of the high-voltage armored cable 41 is electrically connected to the rotor conductive ring 51, and the other end is electrically connected to the inner end of the double-ended conductive element 43. The outer end of the double-ended conductive element 43 is used for electrical connection to another external device.

[0042] This embodiment of the invention, by setting up a rotor extension housing 3 and installing the double-ended conductive element 43 connected to the rotor side on the wall surface of the rotor extension housing 3, abandons the conventional method of installing the double-ended conductive element 43 on the rotor rotating flange, thereby helping to reduce the diameter of the rotating seal assembly 6 (bearing 61 and seal assembly 64), and thus overcoming all the defects caused by the excessively large diameter of the rotating seal assembly 6.

[0043] The defects caused by an excessively large diameter of the rotary seal assembly 6 are: high risk of failure, poor reliability, and high maintenance costs. See the background section for details.

[0044] In some embodiments, an insulating support assembly 52 is also included, which is fixedly mounted on the main shaft 53, and the rotor conductive ring 51 is fixedly mounted on the insulating support assembly 52.

[0045] This embodiment provides a support method for the rotor conductive ring 51. Using an insulating support assembly 52 to support the rotor conductive ring 51 helps to improve the stability of the equipment.

[0046] In some embodiments, a front connector 42 is also included, which is located inside the rotor extension housing 3. The front connector 42 is fixedly connected to one end of the high-voltage armored cable 41 away from the rotor conductive ring 51. The front connector 42 is quick-connected to a double-ended conductive member 43. The outer end of the double-ended conductive member 43 is used for quick-connection with another external device.

[0047] This embodiment achieves the purpose of quick-connection between the double-ended conductive component 43 and the end of the high-voltage armored cable 41, thereby facilitating subsequent maintenance work. It can be understood that the front connector 42 is a type of terminal block, which is fixedly connected to the high-voltage armored cable 41 and achieves electrical connection. The front connector 42 and the double-ended conductive component 43 have male and female ends, thus achieving the purpose of quick-connection.

[0048] The front connector 42 is a straight connector.

[0049] In some embodiments, the front connector 42 includes a first conductive post disposed at the innermost layer and a semiconductor layer disposed at the outermost layer, the semiconductor layer being electrically connected to the grounding layer of the high-voltage armored cable 41 and the outer shell 2.

[0050] This embodiment provides a specific form of the front connector 42. In addition, the semiconductor layer can be connected to the housing 2 by wires or by a conductive mounting structure to establish an electrical connection with the housing 2. The housing 2 is connected to the ground, thereby achieving the purpose of grounding the busbar (i.e., the cable core inside the high-voltage armored cable 41).

[0051] In some embodiments, the dual-ended conductive member 43 includes a second conductive post and an insulating layer cast outside the second conductive post, the insulating layer being sealed to the wall of the rotor extension housing 3.

[0052] This embodiment provides a specific form of the dual-headed conductive element 43, which helps to prevent the internal space of the rotor extension housing 3 and the outer shell 2 from communicating with the external space. It is understood that the internal space of the rotor extension housing 3 and the internal space of the outer shell 2 may or may not be connected, which needs to be determined according to actual needs.

[0053] The main shaft 53 includes a shaft body and a rotary connecting shell 531 sleeved and fixed on the shaft body. The rotary connecting shell 531 has a top plate 5311 with holes. The shaft body passes through the holes and is welded to the top plate 5311. A rotary sealing assembly 6 is sleeved on the outside of the rotary connecting shell 531. High-voltage armored cables 41 all pass through the top plate 5311 of the rotary connecting shell 531. The front connector 42 with a cross-sectional area larger than that of the high-voltage armored cable 41 and the double-ended conductive element 43 are disposed inside the rotor extension shell 3. This allows the interior of the rotary connecting shell 531 to accommodate the shaft body and the rotary connecting shell 6. The high-voltage armored cable 41 reduces the outer diameter of the rotary connecting shell 531, thereby reducing the size of the rotary sealing assembly 6. The lower part of the rotary connecting shell 531 and the upper part of the rotor extension shell 3 are fixedly connected after docking, and a sealing ring is provided between them to seal the docking gap. It can be understood that the internal spaces of the outer shell 2, the rotary connecting shell 531 and the rotor extension shell 3 can be connected or not connected. When they are not connected, the through holes of the high-voltage armored cable 41 on the rotary connecting shell 531 and the rotor extension shell 3 need to be sealed.

[0054] In some embodiments, the mounting port is located at the bottom of the housing 2, and the rotor extension housing 3 is located below the housing 2. The cross-sectional area of ​​the rotor extension housing 3 is larger than the cross-sectional area of ​​the main shaft 53 (i.e., the rotary connecting housing 531) inside the rotary seal assembly 6.

[0055] In some embodiments, the dual-headed conductive element 43 is fixedly disposed on the bottom wall surface of the rotor extension housing 3.

[0056] In some embodiments, the rotary sealing assembly 6 includes a bearing 61, a main shaft sleeve 62, a body 63, and two sealing assemblies 64. Each sealing assembly 64 includes a dynamic sealing ring 641 and a static sealing ring 642. The main shaft sleeve 62 is sleeved and fixed on the main shaft 53, and the body 63 is fixedly disposed on the outer shell 2. The dynamic sealing ring 641 is sleeved on the main shaft sleeve 62 at intervals along the axial direction of the main shaft sleeve 62 and can rotate with the main shaft 53. One static sealing ring 642 corresponds to one dynamic sealing ring 641. The static sealing ring 642 is disposed on the body 63 and has a spaced position along the axial direction of the main shaft sleeve 62. With axial freedom of movement, the static sealing ring 642, under the action of pre-set elastic force, fits against the end face of the dynamic sealing ring 641 to form a sealing pair; a sealing cavity is constructed between the two sealing assemblies 64, the main shaft sleeve 62, and the body 63; a pre-filled isolation fluid is used in the sealing cavity, and the dynamic sealing ring 641 and the static sealing ring 642 are made of ceramic or hard alloy materials; the bearing 61 is used to provide rotational support for the main shaft 53; the bearing 61 is disposed in or outside the sealing cavity; when the bearing 61 is disposed in the sealing cavity, the bearing 61 is located between the two sealing assemblies 64.

[0057] In this embodiment, both the dynamic sealing ring 641 and the static sealing ring 642 are made of ceramic or hard alloy materials. These materials possess extremely high hardness, compressive strength, and deformation resistance, enabling them to withstand higher medium pressures without irreversible deformation or damage. Furthermore, the static sealing ring 642 has axial movement freedom and fits tightly against the end face of the dynamic ring under preload, ensuring good tracking and contact of the sealing pair even during pressure fluctuations, preventing opening and leakage of the sealing interface due to increased pressure. Therefore, this invention is stably applicable to higher-pressure insulating medium environments (e.g., ≥0.8MPa), removing the limitations of traditional seals on increasing electrical transmission power and providing higher power transmission guarantees for single power generation equipment. In addition, ceramics and hard alloys have natural inertness to salt spray corrosion and ultraviolet radiation, and their performance will not degrade due to these environmental factors, solving the fundamental defects of elastic materials such as easy aging, embrittlement, and cracking. Ceramic and cemented carbide have low coefficients of thermal expansion and good dimensional stability under alternating high and low temperature conditions. This avoids thermal deformation or cracking of the sealing surface due to excessive temperature difference, thus ensuring the reliability of the sealing performance.

[0058] This embodiment integrates the bearing 61 and two sets of sealing assemblies 64 into a single body 63, ensuring extremely high coaxiality and installation accuracy, fundamentally reducing uneven wear and abnormal wear caused by alignment errors. Therefore, the sealing system described in this invention has an extremely long service life in harsh marine environments, enabling "maintenance-free" operation with the same lifespan as the main equipment, completely avoiding the huge operating costs and production losses caused by frequent shutdowns for seal replacement. Furthermore, the integrated design ensures the concentricity of the bearing 61 and the seals; even with oscillation, the entire rotating assembly moves as a whole, with minimal internal relative displacement, protecting the delicate sealing interface. Therefore, the system described in this embodiment can better adapt to the uncertain directional oscillations during turret operation, exhibiting higher operational stability and reliability.

[0059] Furthermore, the aforementioned isolation fluid is lubricating oil. The lubricating oil flows in the gap between the sealed cavity and the bearing 61, which not only isolates the medium but also lubricates the bearing 61, simplifying the system structure (eliminating the need for a separate bearing 61 lubrication system) and improving overall reliability.

[0060] In some embodiments, a sliding bushing 65 is also included. The bearing 61 is disposed in the sealed cavity. The sliding bushing 65 is slidably sleeved on the outside of the main bushing 62 along the axial direction of the main bushing 62. The sliding bushing 65 is connected to the main bushing 62 by a key 66. The inner ring of the sliding bushing 65 and the bearing 61 are fixedly connected by an interference fit. The body 63 and the outer ring of the bearing 61 are fixedly connected by an interference fit. The sliding bushing 65 and the inner ring of the bearing 61 form a rotating assembly. The rotating assembly can slide axially on the main bushing 62 to compensate for the thermal expansion and contraction caused by temperature changes between the main bushing 62 and the rotating assembly. At least one dynamic sealing ring 641 in the sealing assembly 64 has a force transmission structure with the rotating assembly, and its installation method allows it to undergo axial displacement to adapt to deformation when subjected to the axial thrust generated by the thermal expansion of the rotating assembly.

[0061] In this embodiment, the rotating assembly consisting of the sliding bushing 65 and the inner ring of the bearing 61 can slide axially on the main bushing 62, directly compensating for the macroscopic dimensional changes (typically on the order of 0.2-0.8 mm) caused by the difference in the coefficients of thermal expansion of the materials between the main shaft 53, the main bushing 62, and the rotating assembly, effectively avoiding the risk of structural jamming or loss of clearance in the bearing 61. Furthermore, through a force transmission structure (such as the drive ring 68 in the following embodiment), the axial stress on the rotating assembly is transmitted to the dynamic sealing ring 641, allowing it to undergo micron-level elastic displacement. This ensures that under extreme temperature shocks, the end face pressure of the sealing pair remains within the optimal range, avoiding abnormal wear due to excessive pressure on the sealing surface or leakage due to separation.

[0062] In some embodiments, a constant-pressure dynamic suppression system is also included, which provides and maintains a pressure of isolation fluid above that of the sealed medium in the sealed cavity.

[0063] In this embodiment, the constant pressure dynamic suppression system continuously injects a pressure-higher-than-the-pressure isolating fluid (such as lubricating oil) into the sealed cavity, forming a stable "pressure wall" on the inner side of the dynamic and static ring sealing pair. This ensures that the sealed medium (insulating medium) is subjected to a net pressure difference pointing inwards under any operating condition, fundamentally eliminating the possibility of media leakage and achieving active containment rather than passive sealing. Furthermore, the sealing pair will experience normal wear during long-term operation, resulting in a slight decrease in preload. The constant pressure dynamic suppression system can monitor and maintain a constant pressure within the sealed cavity in real time, effectively and automatically compensating for the potential decrease in sealing force due to wear, ensuring stable sealing performance throughout its entire lifespan. This is key to achieving "maintenance-free" operation.

[0064] In some alternative embodiments, oil can also be added manually, i.e., by detecting the pressure of the fluid in the sealed cavity in real time, and when it is less than a set threshold, oil can be added manually.

[0065] In some embodiments, the pre-set elastic force comes from a first spring 67 built into the body 63. Under normal conditions, the first spring 67 is in a compressed state and one end abuts against the side of the static sealing ring 642 away from the dynamic sealing ring 641.

[0066] Multiple first springs 67 are provided, and all of them are positioned on the body 63.

[0067] In some embodiments, the end of the main shaft sleeve 62 near the medium is integrally constructed with an annular groove facing the static sealing ring 642, and one of the dynamic sealing rings 641 is disposed in the annular groove. A sealing ring is disposed between the wall of the annular groove and the wall of the dynamic sealing ring 641. The end of the main shaft sleeve 62 near the outside atmosphere is fitted with a drive ring 68. The main shaft sleeve 62 and the drive ring 68 are connected to the main shaft 53 by bolts. One end of the drive ring 68 abuts against the end of the sliding shaft sleeve 65. A limiting part is constructed on the drive ring 68. Another dynamic sealing ring 641 is fitted on the drive ring 68 and its axial movement away from the static sealing ring 642 is restricted by the limiting part.

[0068] In this embodiment, the complex positioning and fixing functions of the dynamic sealing ring 641 near the medium are integrated into a single machined part. The dynamic sealing ring 641 can be precisely positioned simply by embedding it into an annular groove, greatly simplifying the assembly process and reducing reliance on operator skills. Simultaneously, the integrated design avoids the poor sealing problems that can result from using multiple separate fasteners (such as screws). Furthermore, this embodiment allows for positioning on one side of the system, with one end of the drive ring 68 on the other side abutting against the end of the sliding bushing 65. When the sliding bushing 65 generates axial thrust due to thermal expansion, this thrust acts directly on the drive ring 68 through the abutment surface. Since the drive ring 68 is fixed to the main shaft 53 by bolts, this connection allows for micron-level elastic deformation or slight slippage under enormous thrust. The bearing 61 also drives the body 63 and the static sealing ring 642 to slide axially, thereby enabling the dynamic sealing ring 641 and the static sealing ring 642 to slide synchronously, avoiding abnormal pressure between the two components caused by slippage of only one component within the sealing pair.

[0069] In some examples, when the dynamic sealing ring 641 on the atmospheric side is above the static sealing ring 642, the limiting part is a fixing bolt for fixing the drive ring 68. Specifically, the drive ring 68 is fixed to the main sleeve 62 and the main shaft 53 by a plurality of fixing bolts arranged sequentially along the axial direction. Some of the fixing bolts protrude from the outer wall of the drive ring 68. The upper edge of the dynamic sealing ring 641 is provided with a groove, and the fixing bolt is located in the groove, thereby achieving the purpose of restricting the upward movement of the dynamic sealing ring 641.

[0070] In some examples, when the dynamic sealing ring 641 on the atmospheric side is located below the static sealing ring 642, a groove for accommodating the dynamic sealing ring 641 is provided on the drive ring 68, and the bottom surface of the groove is the limiting part.

[0071] In some examples, when the dynamic sealing ring 641 on the medium side is located above the static sealing ring 642, it is necessary to restrict the downward movement of the dynamic sealing ring 641 on the medium side. In this example, an annular groove coaxially provided with the main shaft sleeve 62 is opened on the outer wall below the dynamic sealing ring 641, and an arc-shaped limiting plate is engaged in the annular groove. The upper surface of the arc-shaped limiting plate abuts against the lower surface of the dynamic sealing ring 641, thereby achieving the purpose of restricting the downward and upward movement of the dynamic sealing ring 641.

[0072] In some examples, the static sealing ring 642 is achieved by cooperating with a pin provided on the body 63: the static sealing ring 642 and the body 63 are relatively fixed in circumferential position and can slide relative to each other in axial direction; the dynamic sealing ring 641 is achieved by cooperating with a pin provided on the drive ring 68 or the main shaft sleeve 62: the dynamic sealing ring 641 and the drive ring 68 or the main shaft sleeve 62 are relatively fixed in circumferential position and can slide relative to each other in axial direction.

[0073] In some embodiments, an integrated support 8 is also included, which is used to gather the three high-voltage armored cables 41, reduce the overall cross-sectional size of the three, and facilitate their passage through the smaller cross-section of the rotating connecting shell 531. The integrated support 8 includes three sub-supports 81; the sub-supports 81 are strip plates, the three strip plates are connected end to end and clamped on the main shaft 53 and the three high-voltage armored cables 41. The integrated support 8 is used to fix the relative position of the three high-voltage armored cables 41 between the main shaft 53. Specifically, the parts of the three strip plates used to clamp the main shaft 53 and the three high-voltage armored cables 41 are all provided with semi-circular grooves. The two semi-circular grooves on two adjacent strip plates are connected to form a circular hole structure. The main shaft 53 and the high-voltage armored cables 41 are arranged one-to-one with the four circular holes.

[0074] The stator-side high-voltage brush assembly 1 in this invention can be implemented using the following embodiments:

[0075] In some examples, such as Figures 10-13 As shown, the stator-side high-voltage brush assembly 1 includes: a conductor 15, an insulating support sleeve 11, a brush fixing terminal 14, and a brush 12. The conductor 15 is used to transmit current. The insulating support sleeve 11 is sleeved on the conductor 15 and is used to pass through the wall of the housing 2 and be fixed on the housing 2. The insulating support sleeve 11 located inside the housing 2 forms a cantilever structure and extends toward the rotor conductive ring 51. The end of the conductor 15 located inside the housing 2 extends out from the insulating support sleeve 11. The brush fixing terminal 14 is fixedly disposed on the conductor 15 inside the housing 2 and contacts the conductor 15. The brush fixing terminal 14 is made of conductive material. The brush 12 is mounted on the brush fixing terminal 14 and is used to slide in contact with the conductive surface of the rotor conductive ring 51.

[0076] In this embodiment, the current on the rotor conductive ring 51 is transmitted sequentially through the brush 12, the brush fixing terminal 14, and the conductor 15 to the device outside the housing 2.

[0077] The stator-side high-voltage brush assembly 1 provided by the present invention adopts an independent support structure connected to the outer shell 2, which simplifies the support structure, reduces the concentration points of electric field, and thus ensures the uniformity of the high-voltage electric field.

[0078] In some examples, the brush fixing terminal 14 is made of copper alloy conductive material.

[0079] In some embodiments, the brush 12 is movably disposed on the brush fixing terminal 14 along the direction close to the rotor conductive ring 51. A second spring 19 is disposed on the side of the brush 12 away from the rotor conductive ring 51. Under normal conditions, the second spring 19 is in a compressed state and one end of the second spring 19 abuts against the brush 12 so that the brush 12 has a tendency to move toward the rotor conductive ring 51.

[0080] The present invention uses a second spring 19 to provide the clamping force of the brush 12 and the feed compensation after the brush 12 wears.

[0081] In some embodiments, the end of the second spring 19 away from the brush 12 rests against the end of the conductor 15.

[0082] The second spring 19 in this invention is made of metal, and it can also bear part of the current transmission. This increases the current transmission path and thus improves the stability of current transmission.

[0083] In some examples, a limiting sleeve is fixedly provided at the end of the brush 12 facing the conductor 15, and at least part of the second spring 19 is located inside the limiting sleeve. The limiting sleeve is used to limit the second spring 19 to prevent it from deflecting.

[0084] In some embodiments, a pressure equalization ring 13 is provided over the second spring 19, and both ends of the second spring 19 are always within the range of action of the pressure equalization ring 13. The brush fixing terminal 14 is located within the range of action of the pressure equalization ring 13. It can be understood that the connection between the brush fixing terminal 14 and the conductor 15, and the connection between the brush fixing terminal 14 and the brush 12 are all located within the range of action of the pressure equalization ring 13.

[0085] In this embodiment of the invention, an equalizing ring 13 is used to even out the electric field between the contact area of ​​the second spring 19 and the conductor 15, the contact area of ​​the second spring 19 and the brush 12, and the connection area between the brush fixing terminal 14 and the conductor 15, so as to avoid the concentration of electric field strength at the connection point of the parts and the edge of the parts.

[0086] The effective range refers to the range within which the equalizing ring 13 can create a uniform electric field.

[0087] It should be noted that, Figure 10 The equalizing ring 13 in this embodiment is not a complete equalizing ring 13. In order to make it easier to see the internal structure of the equalizing ring 13, only half of the structure is shown. It can be understood that the equalizing ring 13 in this embodiment is a complete closed ring structure.

[0088] In some examples, the equalizing ring 13 is either hollow or solid.

[0089] In some embodiments, the equalizing ring 13 is fixedly connected to the brush fixing terminal 14 by screws.

[0090] Specifically, the equalizing ring 13 has a connecting strip inside, which extends to the upper or lower side of the brush fixing terminal 14. The connecting strip is fixedly connected to the brush fixing terminal 14 by screws. The connecting strip is also within the effective range of the equalizing ring 13.

[0091] like Figure 12As shown, a threaded hole is provided on the upper side of the brush fixing terminal 14, which is used to engage a screw to fix the connecting strip.

[0092] In some embodiments, an external connecting flange 16 is provided on the insulating support sleeve 11, which is used for fixed connection with the outer casing 2.

[0093] This embodiment provides a method for connecting the insulating support sleeve 11 and the outer shell 2.

[0094] In some embodiments, one end of the brush fixing terminal 14 is provided with a brush holder 17, which can be fixed to the conductor 15.

[0095] This embodiment provides a method for connecting the brush fixing terminal 14 and the conductor 15.

[0096] Specifically, the brush holder 17 has an opening and a certain elastic deformation capacity, which is to facilitate the brush holder 17 being fitted onto the conductor 15. After the brush holder 17 is fitted onto the conductor 15, the two sides of the opening of the brush holder 17 are connected by screws or bolts, and the two sides of the opening are brought closer together by tightening the screws or bolts to clamp the conductor 15 and thus achieve fixation.

[0097] In some embodiments, the brush 12 is mounted on the brush fixing terminal 14 by a semi-annular clamping member 18. The brush fixing terminal 14 has a horizontally arranged mounting surface. The clamping member 18 is detachably mounted on the mounting surface. The clamping member 18 presses the brush 12 against the mounting surface. Under the rebound action of the second spring 19, the brush 12 in the clamped state tends to move toward the rotor conductive ring 51.

[0098] This embodiment provides a brush mounting structure in which the clamping member 18 is also located within the effective range of the equalizing ring 13.

[0099] In some embodiments, conductor 15 is a copper rod.

[0100] This embodiment provides the structure of conductor 15. Specifically, conductor 15 may also be made of other metallic materials.

[0101] In this embodiment of the invention, the insulating support sleeve 11 is pressed and fixed to the equipment housing 2 by the connecting flange 16, and extends cantilevered into the housing 2 to the fixing point of the brush 12. The insulating support sleeve 11 is designed to have sufficient rigidity. The external insulating material ensures the insulation performance between the equipment housing 2 and the high-voltage channel. The internal copper rod serves as a conductor 15 for connection and fixing with the brush fixing terminal 14 and for power transmission.

[0102] Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this invention. Furthermore, those skilled in the art will recognize that, based on the ideas of this invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this invention.

Claims

1. A high-voltage through-wall dynamic power transmission system, characterized in that: include: The system comprises a housing, a stator-side high-voltage brush assembly, a rotor conductive ring, a high-voltage armored cable, a rotary seal assembly, a double-ended conductive element, a main shaft, and a rotor extension housing. The housing has a through-hole extending along its thickness, through which the main shaft passes. The rotary seal assembly is fitted onto the main shaft located at the through-hole, providing rotational support for the main shaft and sealing the through-hole. The rotor conductive ring is fixed to the main shaft located inside the housing. The stator-side high-voltage brush assembly is mounted on the wall of the housing, with one end slidingly contacting the conductive surface of the rotor conductive ring and the other end for electrical connection to external equipment. The rotor extension housing is fixedly connected to the main shaft extending from the through-hole. The double-ended conductive element is fixedly inserted through the wall of the rotor extension housing. One end of the high-voltage armored cable is electrically connected to the rotor conductive ring, and the other end is electrically connected to the inner end of the double-ended conductive element. The outer end of the double-ended conductive element is for electrical connection to another external device. The main shaft includes a shaft body and a rotating connecting shell sleeved and fixed on the shaft body. The rotating connecting shell has a top plate with holes. The shaft body passes through the holes and is welded to the main shaft. A rotating seal assembly is sleeved on the outside of the rotating connecting shell. High-voltage armored cables all pass through the top plate of the rotating connecting shell, allowing the double-ended conductive element to be positioned on the rotor extension housing away from the rotating seal assembly, thereby reducing the diameter of the rotating seal assembly. It also includes a front connector located inside the rotor extension housing. The front connector is fixedly connected to one end of the high-voltage armored cable away from the rotor conductive ring. The front connector and the double-ended conductive element are quick-connected. The outer end of the double-ended conductive element is used for quick-connection with another external device. The double-ended conductive element includes a second conductive post and an insulating layer cast outside the second conductive post. The insulating layer is sealed to the wall of the rotor extension housing. The mounting port is located at the bottom of the outer shell, and the rotor extension housing is positioned below the outer shell. The dual-headed conductive element is fixedly inserted through the bottom wall surface of the rotor extension housing.

2. The high-voltage through-wall dynamic power transmission system according to claim 1, characterized in that: It also includes an insulating support assembly, which is fixedly mounted on the main shaft, and the rotor conductive ring is fixedly mounted on the insulating support assembly.

3. The high-voltage through-wall dynamic power transmission system according to claim 1, characterized in that: The front connector includes an innermost first conductive post and an outermost semiconductor layer, which are electrically connected to the grounding layer of the high-voltage armored cable and the outer shell.

4. The high-voltage through-wall dynamic power transmission system according to claim 1, characterized in that: The rotary sealing assembly includes a bearing, a main shaft sleeve, a body, and two sealing assemblies. Each sealing assembly includes a dynamic sealing ring and a static sealing ring. The main shaft sleeve is fixedly fitted onto the main shaft, and the body is fixedly mounted on the outer shell. The dynamic sealing rings are spaced apart along the axial direction of the main shaft sleeve and can rotate with the main shaft. One static sealing ring corresponds to one dynamic sealing ring. The static sealing ring is mounted on the body and has the freedom to move axially. Under the action of a pre-set elastic force, the static sealing ring fits against the end face of the dynamic sealing ring to form a sealing pair. A sealing cavity is constructed between the two sealing assemblies, the main shaft sleeve, and the body. The sealing cavity is used to pre-fill a separating fluid. The dynamic and static sealing rings are made of ceramic or hard alloy materials. The bearing provides rotational support for the main shaft. The bearing can be located inside or outside the sealing cavity. When the bearing is located inside the sealing cavity, it is positioned between the two sealing assemblies.

5. The high-voltage through-wall dynamic power transmission system according to claim 4, characterized in that: It also includes a sliding bushing, the bearing being disposed within the sealed cavity, the sliding bushing being slidably fitted onto the outside of the main bushing along the axial direction, the sliding bushing being connected to the main bushing via a key; the sliding bushing and the inner ring of the bearing are fixedly connected by an interference fit, the body and the outer ring of the bearing are fixedly connected by an interference fit, the sliding bushing and the inner ring of the bearing form a rotating assembly, the rotating assembly being able to slide axially on the main bushing to compensate for the thermal expansion and contraction caused by temperature changes between the main bushing and the rotating assembly, at least one of the dynamic sealing rings in the sealing assembly having a force transmission structure with the rotating assembly and its installation method allowing it to undergo axial displacement to adapt to deformation when subjected to the axial thrust generated by the thermal expansion of the rotating assembly.

6. The high-voltage through-wall dynamic power transmission system according to claim 4, characterized in that: It also includes a constant pressure dynamic suppression system, which is used to supply and maintain a pressure of isolation fluid higher than that of the sealed medium to the sealed cavity.

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