A magnetic suspension type permanent magnetic coupling velocity measuring device for transformer fault oil pillow oil flow velocity

Abstract

This invention relates to a magnetic levitation permanent magnet coupling speed measuring device for measuring the oil flow rate in a transformer fault oil conservator. The device includes an internal component, a coupling transmission component located outside the oil pipe, and a speed measuring component. The internal component comprises a fan, a magnetic levitation fixing structure, and an inner permanent magnet. The magnetic levitation fixing structure provides contactless levitation support for the fan through magnetic repulsion, and the inner permanent magnet rotates synchronously with the fan. The coupling transmission component includes an outer permanent magnet disk corresponding to the inner permanent magnet; the two achieve contactless synchronous transmission through magnetic field coupling. The speed measuring component detects the rotational speed of the outer permanent magnet disk to calculate the oil flow rate within the oil pipe. This invention can sensitively respond to transient changes in oil flow during transformer fault conditions, significantly reduce rotational friction and transmission lag, achieve high measurement accuracy, requires no modification to the existing oil pipe, is easy to install, has strong anti-interference capabilities, and can effectively improve the reliability of early warning and accurate diagnosis of transformer faults.

Description

Technical Field

[0001] This invention belongs to the field of transformer operation and maintenance monitoring technology, specifically relating to a magnetic levitation permanent magnet coupling speed measuring device for measuring the flow rate of oil sprayed from the oil tank in a transformer fault. Background Technology

[0002] Power equipment is a core support component, and transformers, as key equipment for power transmission and distribution, are widely used in power grid construction, new energy grid connection, industrial production, and residential electricity consumption. Their operational stability directly affects the safe and reliable operation of the power system, making their application value and strategic significance significant. This presents new challenges for transformer fault monitoring, condition diagnosis, and safety protection design.

[0003] During transformer operation, the internal insulating oil not only serves as insulation but also heat dissipation. Its flow state and velocity parameters are important characteristics reflecting internal transformer faults. When a transformer experiences faults such as winding overheating or partial discharge, the internal heat generation increases sharply, leading to intensified thermal convection of the insulating oil and abnormal fluctuations in the oil flow velocity. Therefore, accurately capturing changes in oil flow velocity under transformer fault conditions is a key prerequisite for achieving early warning and accurate diagnosis of transformer faults.

[0004] Current transformer oil flow velocity measurement technologies are mostly designed for steady-state operation and lack the ability to accurately measure under fault conditions. They suffer from large measurement errors, slow response times, and poor adaptability, making it difficult to meet the real-time monitoring and diagnostic needs in fault scenarios. Failure to obtain timely and accurate oil flow velocity data during faults can lead to missed or incorrect fault diagnoses, potentially causing the fault to escalate, affecting the normal power supply of the power system, and even causing equipment damage and safety accidents. Therefore, there is an urgent need to propose a magnetically levitated permanent magnet coupling speed measurement device for measuring the oil flow velocity of the transformer fault oil conservator. Summary of the Invention

[0005] Purpose of the invention To overcome the shortcomings of existing technologies, this invention provides a magnetic levitation permanent magnet coupling speed measuring device for measuring the oil flow velocity of the oil tank in a transformer fault. Addressing the problem of rapid transient changes and short duration of oil flow during short circuits in large power transformers, this invention designs a reasonable measurement structure and device to obtain the maximum oil flow velocity information during short circuits. This allows for accurate judgment of the winding mechanical condition and fault severity. Furthermore, the measured data optimizes transformer operation and maintenance strategies, improves fault diagnosis accuracy, and ensures the safe and stable operation of the power system.

[0006] To achieve the above objectives, the present invention provides the following technical solution: A magnetic levitation permanent magnet coupling speed measuring device for measuring the flow rate of oil sprayed from a transformer fault oil conservator includes an internal component, a coupling transmission component, and a speed measuring component. The internal component is assembled inside the oil pipe and includes a fan, a magnetic levitation fixing structure, and an inner permanent magnet. The magnetic levitation fixing structure includes a rotating side magnet group and a fixed side magnet group fixed to the inner wall of the oil pipe. The rotating side magnet group and the fixed side magnet group are arranged opposite each other with the same polarity to form a non-contact levitation support for the fan in both axial and radial directions. The inner permanent magnet is fixedly connected to the fan. The coupling transmission assembly is located outside the oil pipe. The assembly includes an external permanent magnet disk and a bearing. The bearing is fixedly sleeved on the outside of the oil pipe. The external permanent magnet disk is rotatably mounted on the outer wall of the oil pipe via the bearing. The external permanent magnet disk and the inner permanent magnet are arranged radially correspondingly along the oil pipe. The inner ring of the bearing is fixedly sleeved on the outer wall of the oil pipe. The external permanent magnet disk and the outer ring of the bearing are fixedly connected by a screw. The inner permanent magnet and the external permanent magnet disk achieve power transmission through magnetic field coupling. The inner permanent magnet can drive the external permanent magnet disk to rotate synchronously with the rotation of the fan. The speed measuring component is fixed to the outside of the oil pipe, with the detection end of the speed measuring component facing the rotating surface of the external permanent magnet disk.

[0007] As a further description of the above solution, the external permanent magnet disk has an outer permanent magnet inside, the inner permanent magnet adopts a block structure, and the inner permanent magnet is detachably and fixedly connected to the fan; the external permanent magnet disk adopts a ring structure, and the magnetic poles of the inner and outer permanent magnets are arranged radially along the oil pipe.

[0008] As a further description of the above solution, the rotating magnet assembly includes a fan-side magnetically levitated N-pole magnet and a fan-side magnetically levitated S-pole magnet. The fan-side magnetically levitated N-pole magnet has a ring structure and is sleeved on the fan's bearing rod. The end of the fan's bearing rod is threaded, and a fan-side N-pole magnet fixing block is threadedly connected to the fan's bearing rod, pressing the fan-side magnetically levitated N-pole magnet tightly against the end of the bearing rod closest to the fan. The fan-side magnetically levitated S-pole magnet is surface-mounted and fixed to the end of the fan's bearing rod furthest from the fan. The fixed magnet assembly includes a bracket-side magnetically levitated magnet. The system comprises an N-pole magnet, a support-side magnetically levitated S-pole magnet, and a magnetically levitated bearing frame. The bearing frame has a central sleeve. The diameter of the support-side magnetically levitated N-pole magnet is larger than that of the support-side magnetically levitated S-pole magnet. The support-side magnetically levitated S-pole magnet is mounted on the end of the central sleeve of the bearing frame furthest from the fan. The support-side magnetically levitated N-pole magnet is positioned on the side of the central sleeve of the bearing frame closest to the fan. Both the support-side magnetically levitated S-pole magnet and the support-side magnetically levitated N-pole magnet are surface-mounted. The bearing frame is fixedly connected to the inner wall of the oil pipe.

[0009] As a further description of the above scheme, the N-pole magnetic levitation magnet on the support side and the N-pole magnetic levitation magnet on the fan side are arranged opposite each other radially along the oil pipe. The sides of the N-pole magnetic levitation magnets on the support side and the fan side are both N poles. The radial magnetic repulsion between the N-pole magnetic levitation magnets on the support side and the fan side provides radial suspension support for the fan. The S-pole magnetic levitation magnets on the fan side and the S-pole magnetic levitation magnets on the support side are arranged opposite each other axially along the oil pipe. The sides of the S-pole magnetic levitation magnets on the fan side and the support side are both S poles. The axial magnetic repulsion between the S-pole magnetic levitation magnets on the fan side and the support side provides axial suspension support for the fan. The magnetic levitation bearing frame has a symmetrical structure. The fan and the inner permanent magnet are suspended at the center of the oil pipe cavity by the bearing rod of the fan.

[0010] As a further description of the above solution, the built-in component also includes an inner permanent magnet fixing frame, an inner permanent magnet fixing cover plate, an inner permanent magnet fixing block, and an inner embedded silicon steel sheet. The inner permanent magnet fixing frame and the fan are 3D printed as a single integrated structure. The inner permanent magnet fixing frame has an annular receiving groove in its circumference. Multiple inner permanent magnets are provided, and the multiple inner permanent magnets are arranged circumferentially within the annular receiving groove of the inner permanent magnet fixing frame. An inner permanent magnet fixing block is provided between adjacent inner permanent magnets for circumferential positioning. The inner embedded silicon steel sheet is located on the radial side away from the oil pipe of all inner permanent magnets, and the outer surface of the inner embedded silicon steel sheet is flush with the outer surface of the inner permanent magnet fixing frame. The inner permanent magnet fixing cover plate is closed and fixed to the outside of the inner permanent magnet fixing frame. The inner permanent magnet fixing cover plate and the inner permanent magnet fixing frame together clamp and fix the inner permanent magnets and the inner permanent magnet fixing blocks.

[0011] As a further description of the above solution, the external permanent magnet disk also includes an outer permanent magnet fixing frame and a permanent magnet fastening block. The outer permanent magnet fixing frame is two symmetrical semi-circular structures, and the two semi-circular outer permanent magnet fixing frames are enclosed by connectors to form a ring fixing structure. Multiple outer permanent magnets are provided, and a permanent magnet fastening block is provided between adjacent outer permanent magnets. The permanent magnet fastening block is fixed to the inner side of the outer permanent magnet fixing frame by screws, and the contact surface between the permanent magnet fastening block and the outer permanent magnet is an inclined surface. The permanent magnet fastening block presses the outer permanent magnet tightly onto the inner side of the outer permanent magnet fixing frame through the inclined surface. The coupling transmission assembly also includes a disk bearing spacing positioning assembly, which includes a nut and a screw rod. Multiple screw rods are provided and are arranged at intervals along the circumference of the outer permanent magnet fixing frame. The outer permanent magnet fixing frame is locked and clamped by the screw rods and the nut, so that the outer permanent magnet fixing frame is locked to the outer ring of the bearing and maintains a fixed spacing.

[0012] As a further description of the above solution, the magnetic levitation permanent magnet coupling speed measuring device for measuring the oil flow rate of the transformer fault oil conservator also includes a threaded buckle with a base. The outer wall of the oil pipe is provided with an external mounting thread, and the threaded buckle with the base is fixed to the outer wall of the oil pipe by the thread. The speed measuring component is a laser sensor, which is fixed on the threaded buckle with the base, and the emitting end of the laser sensor is set towards the rotating surface of the external permanent magnet disk.

[0013] As a further description of the above solution, the inner wall of the oil pipe is provided with multiple mounting grooves in the circumferential direction, and the magnetic levitation bearing bracket is provided with mounting protrusions that match the mounting grooves. The magnetic levitation bearing bracket is fixed by engaging the mounting protrusions with the mounting grooves.

[0014] As a further description of the above solution, the inner permanent magnet fixing frame and the inner permanent magnet fixing block are fixedly connected to the inner permanent magnet fixing cover plate by inner disk rivets.

[0015] Advantages and effects of the present invention: 1. Precise Measurement Under Fault Conditions: This invention utilizes a fan within its built-in components to directly contact the high-speed oil flow sprayed onto the oil conservator during transformer faults. A magnetic levitation fixing structure (including a fan-side magnetic levitation N-pole magnet, a fan-side magnetic levitation S-pole magnet, a support-side magnetic levitation N-pole magnet, and a support-side magnetic levitation S-pole magnet) achieves contactless fan levitation, ensuring sensitive start-up and stable rotation under oil flow impact, significantly improving response speed under fault conditions. Combined with magnetic coupling transmission between the inner and outer permanent magnets, non-contact power transmission is achieved, avoiding the lag and frictional losses associated with traditional mechanical transmission. This allows for precise detection of abnormal fluctuations in oil flow velocity, providing reliable data support for transformer fault diagnosis.

[0016] 2. High Measurement Accuracy: This invention achieves axial and radial suspension support for the fan through structures such as a magnetic levitation bearing frame and a fan-side N-pole magnet fixing block, greatly reducing rotational friction resistance and ensuring a highly linear correlation between fan speed and oil flow rate. The inner and outer permanent magnets in the built-in components achieve synchronous rotation through magnetic field coupling. A disk bearing spacing positioning component ensures precise spacing between the inner and outer magnetic rings, avoiding contact loss and magnetic field interference, and improving transmission efficiency. Simultaneously, a sensor (such as Polytec ProSpeed® LSV-2100) is aligned with the external permanent magnet disk for non-contact speed measurement. Combined with fan structural parameters (such as blade diameter and frontal area), the oil flow rate can be calculated with high accuracy, significantly reducing measurement errors.

[0017] 3. Reliable Structure and Strong Adaptability: This invention adopts a separate internal and external component design, eliminating the need for drilling or modification of the transformer's existing oil pipes. Quick installation and sealing are achieved solely through accessories such as threaded fasteners with bases, rubber sleeves, and locking blocks, adapting to complex on-site conditions. Within the internal components, the inner permanent magnet fixing frame, inner permanent magnet fixing cover, and inner permanent magnet fixing block are securely fixed using inner disk rivets, ensuring structural stability under oil flow impact and temperature changes. The external component uses an outer permanent magnet fixing frame and permanent magnet fastening blocks to press the outer permanent magnet using a mortise and tenon structure, and is then secured with screws. The overall structure is compact and highly shock-resistant. The laser sensor is installed outside the pipe, offering strong anti-interference capabilities, adapting to the complex electromagnetic environment of power equipment, and possessing excellent engineering adaptability and long-term operational reliability. Attached Figure Description

[0018] Figure 1 This is a three-dimensional exploded view of the present invention; Figure 2 This is a schematic diagram of the coupling structure of the inner and outer permanent magnets of the present invention; Figure 3 This is a schematic diagram of the coupling transmission component structure of the present invention; Figure 4 This is a schematic diagram of the built-in component structure of the present invention; Figure 5 This is a schematic diagram of the integrated 3D-printed fan permanent magnet mounting bracket of the present invention; Figure 6 This is an exploded view of the inner permanent magnet fixing in this invention; Figure 7 This is an exploded view of an example of the magnetically levitated permanent magnet on the fan side of the present invention; Figure 8 This is an exploded view of the permanent magnet on the side of the magnetic levitation bearing bracket of the present invention; Figure 9 This is a cross-sectional view of the magnetic levitation structure of the present invention; Figure 10 This is a schematic diagram of the permanent magnet support and oil pipe fixing of the present invention; Figure 11 This is a schematic diagram of the outer permanent magnet fixing frame of the present invention; Figure 12 This is a schematic diagram of the sensor installation of the present invention; Figure 13 This is a front view of the coupling structure of the inner and outer permanent magnets of the present invention; Figure 14 This is a schematic diagram of the installation of the inner permanent magnet in this invention; Figure 15 This is a schematic diagram of the installation of the outer permanent magnet in this invention; Figure 16 This is a cross-sectional view of the magnetic levitation bearing bracket of the present invention; Figure 17This is a schematic diagram of the installation of the permanent magnet in the magnetic levitation support of the present invention.

[0019] Explanation of reference numerals in the attached diagram: 1-Laser sensor, 2-Threaded buckle with base, 3-Rubber sleeve, 4-Locking block, 5-Oil pipe, 6-Outer permanent magnet mounting bracket, 7-Bearing, 8-Threaded buckle, 9-Permanent magnet fastening block, 10-Outer permanent magnet, 11-Inner permanent magnet mounting cover, 12-Nut, 13-Screw rod, 14-Screw, 15-Magnetic levitation bearing bracket, 16-Disk bearing spacing positioning assembly, 17-Outer disk rivet, 18-1 Fan, 18-2 Inner permanent magnet mounting bracket, 19-Inner permanent magnet, 20-Inner permanent magnet mounting block, 21-Inner disk rivet, 22-Inner embedded silicon steel sheet, 23-Fan-side magnetic levitation N-pole magnet, 24-Fan-side N-pole magnet mounting block, 25-Fan-side magnetic levitation S-pole magnet, 26-Bracket-side magnetic levitation N-pole magnet, 27-Bracket-side magnetic levitation S-pole magnet. Detailed Implementation

[0020] 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.

[0021] A magnetic levitation permanent magnet coupling speed measuring device for measuring the flow rate of oil sprayed from a transformer fault oil conservator includes an internal component, a coupling transmission component, and a speed measuring component. The internal component is assembled inside an oil pipe 5 and includes a fan 18-1, a magnetic levitation fixing structure, and an inner permanent magnet 19. The magnetic levitation fixing structure includes a rotating magnet group and a fixed magnet group fixed to the inner wall of the oil pipe 5. The rotating magnet group and the fixed magnet group are arranged opposite each other with the same polarity to form a levitation support for the fan 18-1 without contact in both axial and radial directions. The inner permanent magnet 19 is fixedly connected to the fan 18-1. The coupling transmission assembly is located outside the oil pipe 5. The coupling transmission assembly includes an external permanent magnet disk and a bearing 7. The bearing 7 and the external permanent magnet disk are coaxially sleeved on the outside of the oil pipe 5. The external permanent magnet disk is rotatably mounted on the outer wall of the oil pipe 5 through the bearing 7. The external permanent magnet disk and the inner permanent magnet 19 are arranged radially correspondingly along the oil pipe 5. The inner ring of the bearing 7 is fixedly sleeved on the outer wall of the oil pipe 5. The external permanent magnet disk and the outer ring of the bearing 7 are fixedly connected by a screw rod 13. The inner permanent magnet 19 and the external permanent magnet disk achieve power transmission through magnetic field coupling. The inner permanent magnet 19 can drive the external permanent magnet disk to rotate synchronously with the rotation of the fan 18-1. The speed measuring component is fixed to the outside of oil pipe 5, with its detection end facing the external permanent magnet disk. The device of this application is installed in series on the connecting oil pipe between the transformer tank and the oil conservator, preferably on the horizontal straight pipe section between the lower oil outlet of the oil conservator and the gas relay. Because it is installed on the oil pipe between the transformer tank and the oil conservator, close to the oil spray path of the oil conservator, the fault response is more direct and sensitive, enabling more accurate capture of transient oil flow changes during faults, while eliminating the need to modify the tank itself.

[0022] The external permanent magnet disk of the present invention has an outer permanent magnet 10 and an inner permanent magnet 19 with a block structure. The inner permanent magnet 19 is detachably and fixedly connected to the fan 18-1. The external permanent magnet disk has a ring structure, and the magnetic poles of the inner permanent magnet 19 and the outer permanent magnet 10 are arranged radially along the oil pipe 5.

[0023] The rotating magnet assembly of the present invention includes a fan-side magnetically levitated N-pole magnet 23 and a fan-side magnetically levitated S-pole magnet 25. The fan-side magnetically levitated N-pole magnet 23 has a ring structure and is sleeved on the bearing rod of the fan 18-1. The bearing rod of the fan 18-1 has a thread at its end. The fan-side N-pole magnet fixing block 24 is threadedly screwed onto the bearing rod of the fan 18-1 and presses the fan-side magnetically levitated N-pole magnet 23 against the end of the bearing rod near the fan 18-1. The fan-side magnetically levitated S-pole magnet 25 is surface-mounted and fixed to the end of the bearing rod of the fan 18-1 away from the fan 18-1. The fixed magnet assembly includes a bracket-side magnetically levitated N-pole magnet. The system comprises a body 26, a support-side magnetic levitation S-pole magnet 27, and a magnetic levitation bearing frame 15. The magnetic levitation bearing frame 15 has a central sleeve. The diameter of the support-side magnetic levitation N-pole magnet 26 is larger than that of the support-side magnetic levitation S-pole magnet 27. The support-side magnetic levitation S-pole magnet 27 is installed at the end of the central sleeve of the magnetic levitation bearing frame 15 away from the fan 18-1, and the support-side magnetic levitation N-pole magnet 26 is located on the side of the central sleeve of the magnetic levitation bearing frame 15 closer to the fan 18-1. Both the support-side magnetic levitation S-pole magnet 27 and the support-side magnetic levitation N-pole magnet 26 are surface-mounted. The magnetic levitation bearing frame 15 is fixedly connected to the inner wall of the oil pipe 5.

[0024] In this invention, the support-side magnetic levitation N-pole magnet 26 and the fan-side magnetic levitation N-pole magnet 23 are arranged opposite each other radially along the oil pipe 5. The sides of the support-side magnetic levitation N-pole magnet 26 and the fan-side magnetic levitation N-pole magnet 23 adjacent to each other are both N poles. The radial magnetic repulsion between the support-side magnetic levitation N-pole magnet 26 and the fan-side magnetic levitation N-pole magnet 23 provides radial levitation support for the fan 18-1. The fan-side magnetic levitation S-pole magnet 25 and the support-side magnetic levitation S-pole magnet 27 are arranged opposite each other axially along the oil pipe 5. The sides of the fan-side magnetic levitation S-pole magnet 25 and the support-side magnetic levitation S-pole magnet 27 adjacent to each other are both S poles. The axial magnetic repulsion between the fan-side magnetic levitation S-pole magnet 25 and the support-side magnetic levitation S-pole magnet 27 provides axial levitation support for the fan 18-1. The magnetic levitation bearing frame 15 has a symmetrical structure. The fan 18-1 and the inner permanent magnet 19 are limited and suspended at the center of the cavity of the oil pipe 5 by the bearing rod of the fan 18-1.

[0025] This invention utilizes a built-in fan 18-1 that directly contacts the high-speed oil flow sprayed onto the oil conservator during transformer faults. A magnetic levitation fixing structure, including a fan-side magnetic levitation N-pole magnet 23, a fan-side magnetic levitation S-pole magnet 25, a bracket-side magnetic levitation N-pole magnet 26, and a bracket-side magnetic levitation S-pole magnet 27, achieves contactless fan levitation, ensuring sensitive start-up and stable rotation under oil flow impact, significantly improving response speed under fault conditions. Combined with the magnetic coupling transmission between the inner permanent magnet 19 and the outer permanent magnet 10, non-contact power transmission is achieved, avoiding the lag and frictional losses associated with traditional mechanical transmission. This allows for precise detection of abnormal fluctuations in oil flow velocity, providing reliable data support for transformer fault diagnosis.

[0026] The built-in components of this invention also include an inner permanent magnet fixing frame 18-2, an inner permanent magnet fixing cover plate 11, an inner permanent magnet fixing block 20, and an inner embedded silicon steel sheet 22. The inner permanent magnet fixing frame 18-2 and the fan 18-1 are 3D printed integral structures. The inner permanent magnet fixing frame 18-2 is provided with an annular receiving groove in the circumference. Multiple inner permanent magnets 19 are provided, and the multiple inner permanent magnets 19 are arranged circumferentially in the annular receiving groove of the inner permanent magnet fixing frame 18-2. An inner permanent magnet fixing block 20 is provided between adjacent inner permanent magnets 19 for circumferential limiting. The inner embedded silicon steel sheet 22 is provided radially away from the oil pipe 5 of all inner permanent magnets 19. On one side, the outer surface of the inner embedded silicon steel sheet 22 is flush with the outer surface of the inner permanent magnet fixing frame 18-2; the inner permanent magnet fixing cover plate 11 is closed and fixed to the outside of the inner permanent magnet fixing frame 18-2, and the inner permanent magnet fixing cover plate 11 and the inner permanent magnet fixing frame 18-2 together clamp and fix the inner permanent magnet 19 and the inner permanent magnet fixing block 20; specifically, the inner disk rivet 21 is sequentially inserted into the corresponding through holes of the inner permanent magnet fixing frame 18-2, the inner permanent magnet fixing block 20 and the inner permanent magnet fixing cover plate 11 to realize the fastening connection of the inner permanent magnet fixing frame 18-2, the inner permanent magnet fixing block 20 and the inner permanent magnet fixing cover plate 11.

[0027] The external permanent magnet disk of the present invention also includes an outer permanent magnet fixing frame 6 and a permanent magnet fastening block 9. The outer permanent magnet fixing frame 6 is two symmetrical semi-circular structures. The two semi-circular outer permanent magnet fixing frames 6 are enclosed by connectors to form an annular fixing structure. Multiple outer permanent magnets 10 are provided. A permanent magnet fastening block 9 is provided between adjacent outer permanent magnets 10. The permanent magnet fastening block 9 is fixed to the inner side of the outer permanent magnet fixing frame 6 by screws 14. The contact surface between the permanent magnet fastening block 9 and the outer permanent magnet 10 is an inclined surface. The permanent magnet fastening block 9 presses the outer permanent magnet 10 onto the inner side of the outer permanent magnet fixing frame 6 through the inclined surface. The coupling transmission assembly also includes a disk bearing spacing positioning assembly 16, which includes a nut 12 and a screw rod 13. Multiple screw rods 13 are provided and are arranged at intervals along the circumference of the outer permanent magnet fixing frame 6. The outer permanent magnet fixing frame 6 is locked and clamped by the screw rod 13 and the nut 12, so that the outer permanent magnet fixing frame 6 is locked with the outer ring of the bearing 7 and maintains a fixed distance, thereby achieving synchronous rotation.

[0028] The magnetic levitation permanent magnet coupling speed measuring device for the oil flow rate of the transformer fault oil conservator of the present invention also includes a threaded buckle 2 with a base and a laser sensor 1. The outer wall of the oil pipe 5 is provided with an external mounting thread, and the threaded buckle 2 with the base is fixed to the outer wall of the oil pipe 5 by the thread. The speed measuring component is the laser sensor 1, which is fixed on the threaded buckle 2 with the base. The emitting end of the laser sensor 1 is arranged facing the rotating surface of the external permanent magnet disk.

[0029] The inner wall of the oil pipe 5 of the present invention is provided with a plurality of mounting grooves in the circumferential direction, and the magnetic levitation bearing bracket 15 is provided with mounting protrusions that match the mounting grooves. The magnetic levitation bearing bracket 15 is fixed by engaging the mounting protrusions with the mounting grooves.

[0030] The inner permanent magnet fixing bracket 18-2 and the inner permanent magnet fixing block 20 of the present invention are fixedly connected to the inner permanent magnet fixing cover plate 11 by the inner disk rivet 21.

[0031] This invention achieves axial and radial suspension support for the fan through structures such as the magnetic levitation bearing frame 15 and the fan-side N-pole magnet fixing block 24, greatly reducing rotational friction resistance and ensuring a highly linear correspondence between fan speed and oil flow rate. The inner permanent magnet 19 and outer permanent magnet 10 in the built-in components achieve synchronous rotation through magnetic field coupling. The disk bearing spacing positioning component 16 ensures precise spacing between the inner and outer permanent magnets, avoiding contact loss and magnetic field interference, and improving transmission efficiency. Simultaneously, a laser sensor 1 (such as Polytec ProSpeed® LSV-2100) is aligned with the external permanent magnet disk for non-contact speed measurement. Combined with fan structural parameters (such as blade diameter and frontal area), the oil flow rate can be calculated with high precision, significantly reducing measurement errors.

[0032] Specifically, the inner permanent magnet structure is installed as follows: like Figure 6 The inner permanent magnet holder 18-2 has two silicon steel sheets 22 of the same size as the embedded silicon steel sheets 22 inside the groove on its outer side. The embedded silicon steel sheets 22 are inserted to the same depth as the groove, so that the outer groove of the inner permanent magnet holder 18-2 is filled and flattened. Figure 6The inner permanent magnet fixing bracket 18-2 and the outermost (arc-top position) of the inner permanent magnet fixing cover plate 11 have protrusions to prevent radial movement of the permanent magnets (this provides radial fixation, and the inner permanent magnet fixing bracket 18-2 and the inner permanent magnet fixing cover plate 11 are clamped by rivets for axial fixation). Four inner permanent magnets 19 and inner permanent magnet fixing blocks 20 [the four blocks through which the rivets fixing the inner permanent magnet fixing bracket 18-2 and the inner permanent magnet fixing cover plate 11 pass] are arranged in a ring and placed inside the protrusions of the inner permanent magnet fixing bracket 18-2 to prevent radial movement of the permanent magnets. The inner permanent magnets 19 and the inner permanent magnet fixing blocks 20 are clamped and axially fixed by the inner permanent magnet fixing bracket 18-2 and the inner permanent magnet fixing cover plate 11. The inner permanent magnet mounting bracket 18-2, the inner permanent magnet mounting block 20, and the inner permanent magnet mounting cover 11 are provided with round holes for fixing via inner disk rivets 21. The final fixing style is as follows: Figure 7 As shown, Figure 6 Exploded view like Figure 7 The fan-side magnetic levitation N-pole magnet 23 is a ring structure that fits directly onto the fan-side bearing rod. The tip of the rod is threaded, and the fan-side N-pole magnet fixing block 24 is screwed into the bearing rod through the thread, pressing the fan-side magnetic levitation N-pole magnet 23 tightly. The fan-side magnetic levitation S-pole magnet 25 is surface-mounted on the axial surface of the bearing rod. Because it is also subjected to axial force and is inside the bracket sleeve, the surface-mounted magnet is stable and will not fall off. Permanent magnet mounting on the support side, such as Figure 16 The image shows the magnetic levitation bearing bracket 15. The central design features a magnetic levitation bearing sleeve with a larger outer diameter and a smaller inner diameter. The N-pole magnet 26 on the bracket side has a larger diameter than the S-pole magnet 27 on the bracket side. The S-pole magnet 27 can be inserted to the innermost part, while the N-pole magnet 26 is held on the outside. Both are surface-mounted. The final appearance is as follows. Figure 17 As shown. like Figure 9 Magnetic levitation is achieved through the principle of magnetic repulsion between like poles. The N-pole magnet 26 on the support side and the N-pole magnet 23 on the fan side provide radial support for the permanent magnet's N-pole, while the S-pole magnet 25 on the fan side and the S-pole magnet 27 on the support side provide axial support for the permanent magnet's S-pole. Both sides have symmetrical support structures. Therefore, the fan and the inner magnetic ring are magnetically levited in the center of the tube by the bearing rod.

[0033] like Figure 10 The oil pipe 5 has a groove that matches the support angle of the magnetic levitation bearing bracket 15, is nested in for fixation, and is filled with resin to enhance its strength. like Figure 11 The outer permanent magnet fixing bracket 6 has holes on both sides of its semi-circular structure, which are used to fix the two semi-circular outer permanent magnet fixing brackets 6 together with rivets. There are protrusions on both sides to restrict the axial movement of the permanent magnet fastening blocks 9 and the outer permanent magnet 10. For example... Figure 13 The outer permanent magnet 10 moves radially and is secured by the permanent magnet fastening block 9 through a tenon and mortise structure [the contact surface between the permanent magnet fastening block 9 and the outer permanent magnet 10 is an inclined surface]. The permanent magnet fastening block 9 is fixed to the permanent magnet mounting bracket 6 by screws 14.

[0034] like Figure 3 As shown, the magnetic ring that forms the outer structure after being combined, and the bearing 7 have holes through which screw rod 13 passes, are then connected to the bearing 7 by screw rod 13. In the middle, there is a disk bearing spacing positioning component 16 to limit the distance between the magnetic ring and the bearing to prevent them from sticking together, and finally it is locked with nut 12.

[0035] like Figure 12 Laser sensor 1 is fixed to threaded buckle 2 with base by screws. Brand of laser sensor 1: Polytec (Germany) Model: ProSpeed® LSV-2100 Laser Surface Velocitymeter.

[0036] This application adopts a separate internal and external component design, eliminating the need for drilling or modification of the original oil pipes in the transformer. Installation and sealing are achieved quickly using accessories such as threaded buckles 2 with bases, rubber sleeves 3, and locking blocks 4, adapting to complex on-site conditions. Within the internal components, the inner permanent magnet fixing bracket 18-2, inner permanent magnet fixing cover plate 11, and inner permanent magnet fixing block 20 are securely fixed using inner disk rivets 21, ensuring structural stability under oil flow impact and temperature changes. The external component uses an outer permanent magnet fixing bracket 6 and a permanent magnet fastening block 9 to press the outer permanent magnet 10 together using a mortise and tenon structure, and is then secured with screws 14. The overall structure is compact and highly shock-resistant. The laser sensor is installed outside the pipe, offering strong anti-interference capabilities, adapting to the complex electromagnetic environment of power equipment, and possessing good engineering adaptability and long-term operational reliability.

[0037] The above description is merely a few embodiments of this application and is not intended to limit this application in any way. Although this application discloses preferred embodiments as described above, it is not intended to limit this application. Any changes or modifications made by those skilled in the art without departing from the scope of the technical solution of this application using the disclosed technical content are equivalent to equivalent implementation cases and fall within the scope of the technical solution.

Claims

1. A magnetically levitated permanent magnet coupling speed measuring device for measuring the flow rate of oil sprayed into a transformer fault oil conservator, characterized in that, The device includes a built-in component, a coupling transmission component, and a speed measuring component. The built-in component is assembled inside the oil pipe (5). The built-in component includes a fan (18-1), a magnetic levitation fixing structure, and an inner permanent magnet (19). The magnetic levitation fixing structure includes a rotating side magnet group and a fixed side magnet group fixed to the inner wall of the oil pipe (5). The rotating side magnet group and the fixed side magnet group are arranged opposite each other with the same polarity to form a levitation support for the fan (18-1) in both axial and radial directions without contact. The inner permanent magnet (19) is fixedly connected to the fan (18-1). The coupling transmission assembly is located outside the oil pipe (5). The coupling transmission assembly includes an external permanent magnet disk and a bearing (7). The bearing (7) is fixedly sleeved on the outside of the oil pipe (5). The external permanent magnet disk is rotatably mounted on the outer wall of the oil pipe (5) through the bearing (7). The external permanent magnet disk and the inner permanent magnet (19) are arranged radially corresponding to each other along the oil pipe (5). The inner ring of the bearing (7) is fixedly sleeved on the outer wall of the oil pipe (5). The external permanent magnet disk and the outer ring of the bearing (7) are fixedly connected by a screw rod (13). The inner permanent magnet (19) and the external permanent magnet disk achieve power transmission through magnetic field coupling. The inner permanent magnet (19) can drive the external permanent magnet disk to rotate synchronously with the rotation of the fan (18-1). The speed measuring component is fixed to the outside of the oil pipe (5), and the detection end of the speed measuring component faces the rotating surface of the external permanent magnet disk.

2. The magnetic levitation permanent magnet coupling speed measuring device for measuring the oil flow rate of the transformer fault oil conservator according to claim 1, characterized in that, The external permanent magnet disk has an outer permanent magnet (10) inside, and the inner permanent magnet (19) adopts a block structure. The inner permanent magnet (19) is detachably and fixedly connected to the fan (18-1). The external permanent magnet disk adopts a ring structure, and the magnetic poles of the inner permanent magnet (19) and the outer permanent magnet (10) are arranged radially along the oil pipe (5).

3. The magnetic levitation permanent magnet coupling speed measuring device for measuring the oil flow rate of the transformer fault oil conservator according to claim 2, characterized in that, The rotating magnet assembly includes a fan-side magnetic levitation N-pole magnet (23) and a fan-side magnetic levitation S-pole magnet (25). The fan-side magnetic levitation N-pole magnet (23) is a ring structure and is sleeved on the bearing rod of the fan (18-1). The bearing rod of the fan (18-1) is threaded at its end. The fan-side N-pole magnet fixing block (24) is threaded onto the bearing rod of the fan (18-1) and presses the fan-side magnetic levitation N-pole magnet (23) against the end of the bearing rod near the fan (18-1). The fan-side magnetic levitation S-pole magnet (25) is surface-mounted to the end of the bearing rod of the fan (18-1) away from the fan (18-1). The fixed magnet assembly includes a bracket-side magnetic levitation N-pole magnet (26), a support... The frame-side magnetic levitation S-pole magnet (27) and magnetic levitation bearing frame (15) are provided with a sleeve at the center of the magnetic levitation bearing frame (15). The diameter of the frame-side magnetic levitation N-pole magnet (26) is larger than that of the frame-side magnetic levitation S-pole magnet (27). The frame-side magnetic levitation S-pole magnet (27) is installed at the end of the central sleeve of the magnetic levitation bearing frame (15) away from the fan (18-1). The frame-side magnetic levitation N-pole magnet (26) is set on the side of the central sleeve of the magnetic levitation bearing frame (15) close to the fan (18-1). Both the frame-side magnetic levitation S-pole magnet (27) and the frame-side magnetic levitation N-pole magnet (26) are surface-mounted. The magnetic levitation bearing frame (15) is fixedly connected to the inner wall of the oil pipe (5).

4. The magnetic levitation permanent magnet coupling speed measuring device for measuring the oil flow rate of the transformer fault oil conservator according to claim 3, characterized in that, The support-side magnetic levitation N-pole magnet (26) and the fan-side magnetic levitation N-pole magnet (23) are arranged radially opposite each other along the oil pipe (5). The sides of the support-side magnetic levitation N-pole magnet (26) and the fan-side magnetic levitation N-pole magnet (23) adjacent to each other are both N poles. The radial magnetic repulsion between the support-side magnetic levitation N-pole magnet (26) and the fan-side magnetic levitation N-pole magnet (23) provides radial levitation support for the fan (18-1). The fan-side magnetic levitation S-pole magnet (25) and the support-side magnetic levitation S-pole magnet (27) are arranged radially opposite each other along the oil pipe (5). The pipe (5) is arranged axially opposite each other. The S pole of the magnetic levitation S pole magnet (25) on the fan side and the magnetic levitation S pole magnet (27) on the support side are both S poles. The axial magnetic repulsion between the magnetic levitation S pole magnet (25) on the fan side and the magnetic levitation S pole magnet (27) on the support side provides axial suspension support for the fan (18-1). The magnetic levitation bearing frame (15) is a symmetrical structure. The fan (18-1) and the inner permanent magnet (19) are suspended in the center of the cavity of the oil pipe (5) by the bearing rod of the fan (18-1).

5. The magnetic levitation permanent magnet coupling speed measuring device for measuring the oil flow rate of the transformer fault oil conservator according to claim 1, characterized in that, The built-in components also include an inner permanent magnet fixing frame (18-2), an inner permanent magnet fixing cover plate (11), an inner permanent magnet fixing block (20), and an inner embedded silicon steel sheet (22). The inner permanent magnet fixing frame (18-2) and the fan (18-1) are 3D printed integral structures. The inner permanent magnet fixing frame (18-2) is provided with an annular receiving groove in the circumference. Multiple inner permanent magnets (19) are provided. The multiple inner permanent magnets (19) are arranged in the annular receiving groove of the inner permanent magnet fixing frame (18-2) in the circumference. There is a space between adjacent inner permanent magnets (19). The inner permanent magnet fixing block (20) is used for circumferential positioning; the inner embedded silicon steel sheet (22) is set on the side of all inner permanent magnets (19) that is radially away from the oil pipe (5), and the outer surface of the inner embedded silicon steel sheet (22) is flush with the outer surface of the inner permanent magnet fixing frame (18-2); the inner permanent magnet fixing cover plate (11) is closed and fixed on the outside of the inner permanent magnet fixing frame (18-2), and the inner permanent magnet fixing cover plate (11) and the inner permanent magnet fixing frame (18-2) together clamp and fix the inner permanent magnet (19) and the inner permanent magnet fixing block (20).

6. The magnetic levitation permanent magnet coupling speed measuring device for measuring the oil flow rate of the transformer fault oil conservator according to claim 2, characterized in that, The external permanent magnet disk also includes an outer permanent magnet fixing frame (6) and a permanent magnet fastening block (9). The outer permanent magnet fixing frame (6) is two symmetrical semi-circular structures. The two semi-circular outer permanent magnet fixing frames (6) are connected by connectors to form a ring fixing structure. There are multiple outer permanent magnets (10). A permanent magnet fastening block (9) is provided between adjacent outer permanent magnets (10). The permanent magnet fastening block (9) is fixed to the inner side of the outer permanent magnet fixing frame (6) by screws (14). The contact surface between the permanent magnet fastening block (9) and the outer permanent magnet (10) is an inclined surface. The permanent magnet fastening block (9) presses the outer permanent magnet (10) onto the inner side of the outer permanent magnet fixing frame (6) through the inclined surface. The coupling transmission assembly also includes a disk bearing spacing positioning assembly (16), which includes a nut (12) and a screw rod (13). Multiple screw rods (13) are provided and are arranged at intervals along the circumference of the outer permanent magnet fixing frame (6). The outer permanent magnet fixing frame (6) is locked and clamped by the screw rod (13) and the nut (12), so that the outer permanent magnet fixing frame (6) is locked with the outer ring of the bearing (7) and maintains a fixed spacing.

7. The magnetic levitation permanent magnet coupling speed measuring device for measuring the oil flow rate of the transformer fault oil conservator according to claim 1, characterized in that, It also includes a threaded buckle (2) with a base, and the outer wall of the oil pipe (5) is provided with an external mounting thread. The threaded buckle (2) with a base is fixed to the outer wall of the oil pipe (5) by the thread. The speed measuring component is a laser sensor (1). The laser sensor (1) is fixed on the threaded buckle (2) with a base. The emitting end of the laser sensor (1) is set towards the rotating surface of the external permanent magnet disk.

8. The magnetic levitation permanent magnet coupling speed measuring device for measuring the oil flow rate of the transformer fault oil conservator according to claim 1, characterized in that, The inner wall of the oil pipe (5) is provided with multiple mounting grooves in the circumferential direction. The magnetic levitation bearing bracket (15) is provided with mounting protrusions that match the mounting grooves. The magnetic levitation bearing bracket (15) is fixed by engaging the mounting protrusions with the mounting grooves.

9. The magnetic levitation permanent magnet coupling speed measuring device for measuring the oil flow rate of the transformer fault oil conservator according to claim 5, characterized in that, The inner permanent magnet fixing bracket (18-2) and the inner permanent magnet fixing block (20) are fixedly connected to the inner permanent magnet fixing cover plate (11) by the inner disk rivet (21).

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