Intelligent oil level gauge with interchangeability

Abstract

This utility model discloses an interchangeable intelligent oil level gauge, including a float assembly, a mounting base module, and an electronic control module. The float assembly includes an external shaft structure and a gear structure, with a pointer swing angle uniformly ranging from 0° to 120° and a float assembly rotation range of -60° to +60°. The mounting base module includes a housing, a central shaft, a bearing, and a universal joint assembly. The central shaft connects the pointer and a hollow angle sensor via an eccentric rotating shaft. The electronic control module includes a base box, a cover, a display screen, a controller, and a power module. The controller is connected to a lead socket via a data cable. The float assemblies are interchangeable, driving the pointer to rotate and transmitting data to the electronic control module for display via the sensor. This utility model uses interchangeable float assemblies in conjunction with a hollow angle sensor to achieve digital oil level monitoring. The modular design eliminates the need for complete disassembly for maintenance, and the electronic control module supports data display and storage, solving the problems of difficult maintenance and blind spots in traditional oil level gauges.

Description

Technical Field

[0001] This utility model relates to the field of oil level gauge technology, specifically to an intelligent oil level gauge with interchangeable features. Background Technology

[0002] In power systems, oil-immersed power transformers are key equipment, and the reliability of their operation is of paramount importance. Accurately monitoring the oil level in the transformer tank or conservator is a crucial link in ensuring safe operation. Currently, the commonly used traditional mechanical oil level gauges work based on the principle of buoyancy. Changes in the oil level in the oil tank cause the float to move up and down, and the dial pointer is driven to rotate through the float rod, mechanical transmission device and magnetic coupler to indicate the oil level.

[0003] However, these devices generally have functional limitations, failing to convert oil level information into remotely transmittable electrical signals. This results in operational data being displayed only locally, making it difficult to integrate with substation integrated automation systems or IoT platforms. This severely restricts the realization of remote monitoring, centralized data management, and intelligent diagnostic capabilities. Furthermore, in traditional structures, components such as floats and connecting rods are constantly immersed in insulating oil, making them prone to material aging, corrosion, deformation, or jamming. This can lead to transmission failure or indication deviation. Additionally, the mechanical transmission components contain numerous moving parts, which, after long-term operation, experience wear, accumulated clearances, or vibration, resulting in decreased indication accuracy, unstable rotation, and even malfunctions. Existing oil level gauges suffer from problems such as skipped needles and jamming. Furthermore, the core components of current oil level gauges, such as the float, drive shaft, and pointer, are highly integrated and interdependent. If any part fails, the entire gauge often needs to be disassembled and replaced, making maintenance complex, time-consuming, and risky, especially when operating the transformer with oil, significantly increasing maintenance costs. In addition, the limited rotation angle of traditional mechanical gauges typically cannot cover the full range of oil level changes, resulting in blind spots. Especially under extreme conditions of low or high oil levels, they may not accurately reflect the true oil level, posing safety hazards. Moreover, operational data cannot be stored or traced, hindering fault analysis and condition assessment. Therefore, there is an urgent need for an intelligent oil level gauge that can solve these problems. Utility Model Content

[0004] The purpose of this invention is to provide an intelligent oil level gauge that is interchangeable and can solve the problems of difficult maintenance, blind spots, and difficulty in fault analysis and condition assessment of traditional oil level gauges.

[0005] To achieve the above objectives, the technical solution of this utility model is as follows:

[0006] An interchangeable intelligent oil level gauge includes a float assembly, a mounting base module with a pointer, and an electronic control module. The float assembly includes an external shaft structure and a gear structure. The mounting base module also includes a housing and a central shaft, wherein the central shaft is interchangeably connected to the external shaft structure or gear structure of the float assembly, thereby driving the pointer to rotate. The pointer rotation range is 0° to +120°. °, corresponding to a float assembly rotation range of -60° to +60°; The outer casing has a transparent cover at one end and a flange connection seat at the other end, with a dial and bearing in the middle. The central shaft is rotatably mounted in the bearing, and the shaft body near the outer end of the central shaft has a motion seal, while the side near the inner end is connected to a universal joint assembly. The universal joint assembly is connected to an eccentric rotating shaft, which passes through the dial and is connected to a pointer at its end. A hollow angle sensor is also connected to the eccentric rotating shaft, and the hollow angle sensor is electrically connected to a lead wire socket, which is embedded in the surface of the outer casing. The electronic control module includes a base box with a cover embedded in its surface. Inside the base box are a display screen, a controller, a storage module, and a power module that are electrically connected together. The cover has a control button that is electrically connected to the controller. The controller is also connected to a data cable that matches the lead wire socket.

[0007] Furthermore, travel limit blocks are respectively provided on both sides of the eccentric wheel of the eccentric rotating shaft in the direction of rotation, wherein the travel limit blocks are fixedly connected to the inner wall of the outer casing. When the oil level reaches the limit position, the eccentric wheel touches the travel limit block, preventing the pointer from continuing to rotate. This design can prevent damage to the transmission mechanism due to overtravel, protect internal parts, ensure that the pointer accurately indicates within the range, and improve the safety and durability of the device.

[0008] Furthermore, the cover has a notch corresponding to the display screen, and a transparent window is installed at the notch. The transparent window is secured with a fixing frame on all four sides, which firmly presses the transparent window into the notch of the cover. The transparent window is made of a single square glass pane, allowing observation of the internal display screen through the notch while preventing dust from entering. The sealing edge is designed for the installation of the transparent window, providing dust and water resistance. During use, the oil level data on the display screen can be observed through the transparent window, and control buttons can be operated to view historical data. This design improves the sealing of the electronic control module, enabling reliable operation of the equipment.

[0009] Furthermore, the base box also includes a mounting base and several mounting holes, with the mounting base connecting to the mounting holes. The power module is mounted on the innermost side of the mounting base, the controller and storage module are mounted in the middle, and the display screen is embedded on the outermost side. The controller and data cable are detachably connected. The controller also has a data cable connector; the connector passes through the mounting base and snaps into one of the mounting holes in the base box, allowing the data cable to be detachably connected to the connector. The connector on the controller passes through the mounting base and snaps into the mounting hole in the base box for positioning. The data cable can be plugged in and out of the connector at any time, enabling quick connection or disconnection from the controller. This modular installation structure ensures a reasonable and secure layout of the electronic components, improving internal space utilization efficiency and ease of assembly and maintenance.

[0010] Furthermore, the external shaft structure consists of a central shaft mounting base, an external shaft, a connecting rod A, and a float A. The central shaft mounting base is detachably connected to the mounting base module, and the external shaft is rotatably mounted in the middle. One end of the external shaft is connected to the mounting base module, and the other end is fixedly connected to the connecting rod A. The end of the connecting rod A is fixedly connected to the float A. The external shaft structure, connected to the mounting base module, drives the pointer to rotate, and the rotation range of the float A is from -60° to +60°, corresponding to the pointer rotation range of 0° to +120°. When the float assembly is an external shaft structure, changes in the oil level in the oil tank cause the float A, which floats on the oil surface, to move up and down. Its movement is transmitted to the external shaft through the connecting rod A, and then connected to the mounting base module, thereby causing the pointer to deflect and realizing oil monitoring. This structure simplifies the mechanical transmission chain, avoids the wear and jamming problems caused by traditional multi-stage transmission, and the modular design allows maintenance to be performed by replacing only the float assembly, significantly improving maintenance efficiency and reducing the risk of operating with oil.

[0011] Furthermore, the central shaft mounting base is made of aluminum alloy, with bolts symmetrically arranged on both sides. The bolts pass through the central shaft mounting base and the mounting base module, and nuts are threaded onto the bolts for a limiting connection. The central shaft mounting base is placed on the mounting base module, and the bolts passing through both and tightening the nuts achieve a secure limiting connection between the float assembly and the base module. When the oil level changes, causing the float A to rise and fall, the movement is transmitted to the external shaft via connecting rod A. The external shaft connects to the mounting base module, thereby driving the central shaft and pointer to rotate, thus indicating the oil level. The hollow stainless steel connecting rod A ensures strength and corrosion resistance while reducing the weight of the transmission components. The aluminum alloy central shaft mounting base reduces the overall weight, and the bolts and nuts provide a stable and reliable connection, ensuring transmission reliability. This detachable structure facilitates the overall replacement and maintenance of the float assembly, improving the interchangeability and practicality of the device.

[0012] Furthermore, the connecting rod A is a hollow stainless steel rod, with a mounting sleeve connected to its end. The mounting sleeve is fitted onto the end of the external shaft, and a screw is also provided on the mounting sleeve. The screw passes through the mounting sleeve and connects to the external shaft. The float A is made of stainless steel and is a hollow sphere that can float on the insulating oil. When the oil level changes, the float A floats up and down with the oil level, driving the connecting rod A to move. The connecting rod A transmits force to the external shaft through the mounting sleeve and the screw, driving the external shaft to rotate. The hollow stainless steel connecting rod A ensures structural strength and corrosion resistance. The connection method of the mounting sleeve and the screw is simple in structure, easy to assemble and disassemble, and firmly connected, ensuring effective torque transmission. At the same time, the stainless steel hollow float A has good durability and buoyancy stability, which together ensure the sensitivity, accuracy, and long-term reliability of oil level monitoring. Moreover, this connection structure facilitates the quick assembly and replacement of the float assembly.

[0013] Furthermore, the gear structure includes a gear module mounting base, a connecting rod B, and a float B, wherein the gear module mounting base is connected to the mounting base module; a rotating shaft is rotatably mounted on one side inside the gear module mounting base, and a bevel gear A is located near the end of the rotating shaft; a bevel gear B is rotatably mounted perpendicularly to the bevel gear A, wherein bevel gear A and bevel gear B mesh, and bevel gear B is connected to the mounting base module; one end of the connecting rod B is fixedly connected to the middle of the rotating shaft, and the other end is fixedly connected to the float B. When the oil level changes, causing the float B to float up and down, the connecting rod B drives the rotating shaft to swing. The rotating shaft drives the bevel gear A to rotate. The meshing of bevel gear A and bevel gear B changes the direction of motion, realizing the vertical transmission of power. Bevel gear B is connected to the mounting base module, ultimately driving the pointer inside the mounting base module to rotate, thus displaying the oil level detection result. The swing range of the float B is -45° to 0° or 0° to 45° in the vertical direction, corresponding to the pointer rotation range of 0° to +120°. Through the bevel gear transmission structure, the lateral swing of the float is effectively converted into vertical rotation output. This not only results in a compact structure and strong adaptability, but also stable and reliable transmission, expanding the rotation angle range and improving the indication accuracy.

[0014] Furthermore, the connecting rod B is a hollow stainless steel rod; the float B is also made of stainless steel and is a hollow sphere that can float on the insulating oil. Both the connecting rod B and the float B utilize a hollow stainless steel structure, which, while ensuring corrosion resistance, sufficient strength, and buoyancy, effectively reduces the weight of the transmission components, lowers the moment of inertia, and improves the response sensitivity to oil level changes and transmission stability. The overall structure is reliable, which is beneficial for improving the accuracy of oil level monitoring and the durability of long-term operation.

[0015] Furthermore, the transparent cover is made of transparent plastic or glass, facilitating observation of the pointer; the outer casing is made of aluminum alloy, making it lightweight and corrosion-resistant. The transparent cover, made of transparent plastic or glass, allows for easy observation of the pointer position and provides good light transmission and protection; the outer casing, made of aluminum alloy, is lightweight, easy to install, and has excellent corrosion resistance, effectively protecting internal components and meeting the environmental requirements for long-term transformer operation.

[0016] How to use this utility model:

[0017] The controller is the core of the electrical control module, mainly used to display oil level, record data, provide limit alarms, and record historical curves. It can filter and process the received data. The cover is integrally molded using 3D printing technology, providing excellent sealing. The control buttons turn pages on the display screen; pressing one button flips the page, facilitating observation by staff. During use, the external shaft structure or gear structure of the float assembly is flexibly selected based on the installation space of the transformer oil conservator, the required indicating range, and maintenance convenience requirements. The mounting base module is securely installed on the reserved interface of the transformer tank or oil conservator via a flange connection. The central shaft is rotatably mounted in the outer casing via bearings and sealed with a moving shaft seal to prevent oil leakage. When using an external shaft structure, the float rises and falls with the oil level, driving the connecting rod and external shaft to rotate. This motion is transmitted to the universal joint assembly via the central shaft, and then the eccentric rotating shaft drives the pointer to deflect on the dial to indicate the oil level. The external shaft structure has a rotation range of -60° to +60°, while the pointer has a rotation range of 0° to +120°, suitable for symmetrical oil level change monitoring scenarios. When using a gear structure, after the gear structure is connected to the mounting base module, the central shaft is rotated through gear transmission, which in turn drives the pointer to deflect. The pointer's rotation range is 0° to +120°, while the gear structure's rotation range is -45° to 0° or 0° to 45°, which is more suitable for unidirectional large-angle indication needs and effectively avoids the indication blind spot problem of traditional meters.

[0018] Regardless of the structure, the hollow angle sensor on the eccentric rotating shaft can detect the shaft angle in real time and convert it into an electrical signal, which is output to the controller through the lead socket. After receiving the signal through the data line, the controller processes the data internally and displays the oil level value on the display screen. At the same time, the storage module can record oil level change data for a long time, which is convenient for historical traceability and status analysis. The power module provides a stable power supply to the system, and the control buttons can be used for parameter setting or function operation. When it is necessary to change the float assembly type or perform maintenance, it is only necessary to remove the original float assembly from the mounting base module and replace it with a new external shaft structure or gear structure assembly. There is no need to disassemble the entire oil level gauge or modify the mounting base module, which greatly simplifies the maintenance process and reduces the operational risks in oily operation.

[0019] The central shaft is rotatably mounted within the bearing to ensure smooth rotation and improve rotational accuracy. A motion seal is located near its outer end to provide strong support and prevent external impurities or oil from seeping inwards along the axis. When the float assembly drives the central shaft to rotate according to oil level changes, the rotation is transmitted to the eccentric rotating shaft via the universal joint assembly. The universal joint assembly allows for stable power transmission with a certain angular deviation, accommodating minor misalignments during installation or operation. The eccentric rotating shaft passes through the dial, and its end is connected to a pointer, causing the pointer to rotate on the dial to indicate the oil level. A transparent cover is located at one end of the outer casing for easy observation of the pointer position, while also providing dust and water protection.

[0020] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0021] 1. This utility model solves the problems of difficult maintenance and blind spots in traditional oil level gauges through modular design; the use of interchangeable float components can adapt to different monitoring needs and eliminate blind spots; the conversion of oil level electrical signals is achieved through a hollow angle sensor, supporting digital monitoring and data storage; the mounting base module and float component are detachably connected, eliminating the need for complete disassembly during maintenance and reducing operational risks; the electronic control module has data display and storage capabilities, facilitating oil level gauge status assessment.

[0022] 2. The mounting base module of this utility model adopts a bearing-supported central shaft, ensuring smooth rotation, and the motion shaft seal effectively prevents oil and dust. The universal joint assembly enhances transmission adaptability, the eccentric rotating shaft achieves precise transmission and adjustable center distance, and the travel limit block prevents overtravel damage and protects the internal structure. The integrated hollow angle sensor and lead wire socket enable remote transmission of oil level signals and digital monitoring, improving the level of intelligence. The transparent cover facilitates reading, and the aluminum alloy shell is lightweight, corrosion-resistant, and provides good overall protection. The modular design facilitates quick docking with different float assemblies, making maintenance convenient and highly interchangeable, significantly improving the reliability, accuracy, and practicality of the oil level gauge.

[0023] 3. This utility model features a detachable external shaft and gear-based float assembly design, allowing for interchangeability with the mounting base module, facilitating maintenance and replacement. The stainless steel hollow connecting rod and float combine strength, corrosion resistance, and lightweight design, improving sensitivity and lifespan. The external shaft structure has a rotation range of -60° to +60°, while the gear structure, through bevel gear transmission, enables multi-angle rotation from -45° to 0° or 0° to 45°, expanding the indication range and effectively reducing blind spots. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0025] Figure 2 This is a schematic diagram of the internal structure of the mounting mold base of this utility model.

[0026] Figure 3 This is a schematic diagram showing the connection relationship between gear A and bevel gear B in the gear structure of this utility model.

[0027] Figure 4 This is a schematic diagram of the specific structure of the electronic control module of this utility model.

[0028] Attached image labels:

[0029] Mounting base module-1, pointer-11, housing-12, central shaft-13, flange connector-14, bearing-15, motion shaft seal-16, universal joint assembly-17, eccentric rotating shaft-18, travel limit block-19, hollow angle sensor-110, lead wire socket-111, cover plate-112, external shaft structure-2, central shaft mounting base-21, external shaft-22, connecting rod A-23, float A -24, Mounting sleeve -25, Screw -26, Gear structure -3, Gear module mounting base -31, Connecting rod B -32, Float B -33, Rotating shaft -34, Bevel gear A -35, Bevel gear B -36, Electrical control module -4, Base box -41, Box cover -42, Control button -421, Transparent window -422, Display screen -43, Power module -44, Fixing frame -45, Mounting base -46, Mounting hole -47. Detailed Implementation

[0030] The present invention will be further described below with reference to the accompanying drawings.

[0031] Example 1: An interchangeable intelligent oil level gauge includes a float assembly, a mounting base module 1 with a pointer 11, and an electronic control module 4. The float assembly includes an external shaft structure 2 and a gear structure 3. The mounting base module 1 also includes a housing 12 and a central shaft 13, wherein the central shaft 13 is interchangeably connected to the external shaft structure 2 or the gear structure 3 of the float assembly, thereby driving the pointer 11 to rotate. The pointer 11 rotates from 0° to +120°, corresponding to a float assembly rotation range of -60° to +60°. One end of the housing 12 is fitted with a transparent cover plate 112, and the other end is fitted with a flange connection seat 14. A dial and a bearing 15 are also provided in the middle. The central shaft 13 is rotatably mounted in the bearing 15, and the shaft of the central shaft 13 is located on the side closer to the outer end. The body is equipped with a motion shaft seal 16, and a universal joint assembly 17 is connected to one side near the inner end; the universal joint assembly 17 is connected to an eccentric rotating shaft 18, which passes through the dial and is connected to a pointer 11 at its end. A hollow angle sensor 110 is also connected to the eccentric rotating shaft 18, and the hollow angle sensor 110 is electrically connected to a lead wire socket 111, which is embedded in the surface of the outer casing 12; the electronic control module 4 includes a base box 41, and a cover 42 is embedded in the surface of the base box 41. Inside, a display screen 43, a controller, a storage module, and a power module 44 are electrically connected together, and a control button 421 electrically connected to the controller is embedded in the cover 42; the controller is also connected to a data cable that matches the lead wire socket 111.

[0032] The controller is the core of the electrical control module 4, mainly used to display oil level, record data, set limit alarms, record historical curves, etc., and can filter and process the received data. In this embodiment, the controller model used is SK-070QS. The cover 42 is integrally molded using 3D printing technology, providing excellent sealing. The control button 421 is used to turn pages on the display screen 43; pressing it once turns the page, facilitating observation by staff. During use, based on the installation space of the transformer oil conservator, the required indication range, and maintenance convenience requirements, the external shaft structure 2 or gear structure 3 of the float assembly is flexibly selected for assembly. The base module 1 is securely installed on the reserved interface of the transformer tank or oil conservator via the flange connection seat 14. The central shaft 13 is rotatably mounted inside the outer casing 12 via the bearing 15 and is sealed by the motion shaft seal 16 to prevent oil leakage. When the external shaft structure 2 is selected, the float moves with the oil level, driving the connecting rod A23 and the external shaft 22 to rotate. Its movement is transmitted to the universal joint assembly 17 via the central shaft 13, and then the eccentric rotating shaft 18 drives the pointer 11 to deflect on the dial to indicate the oil level. The rotation range of the external shaft structure 2 is -60° to +60°, and the rotation range of the pointer 11 is 0° to +120°, which is suitable for symmetrical oil levels. In position change monitoring scenarios, when gear structure 3 is selected, after gear structure 3 is connected to the mounting base module 1, it drives the central shaft 13 to rotate through gear transmission, thereby driving the pointer 11 to deflect. The pointer 11 rotates from 0° to +120°, while gear structure 3 rotates from -45° to 0° or from 0° to 45°, which is more suitable for unidirectional large angle indication requirements and effectively avoids the indication blind spot problem of traditional meters. Regardless of the structure, the hollow angle sensor 110 on the eccentric rotating shaft 18 can detect the shaft angle in real time and convert it into an electrical signal, which is output to the controller through the lead socket 111. The controller receives the signal through the data cable. After receiving the signal, the internal controller processes the data and displays the oil level value on the display screen 43. At the same time, the storage module can record the oil level change data for a long time, which is convenient for historical traceability and status analysis. The power supply module 44 provides a stable power supply to the system, and the control button 421 can be used for parameter setting or function operation. When it is necessary to change the float assembly type or perform maintenance, it is only necessary to remove the original float assembly from the mounting base module 1 and replace it with a new external shaft structure 2 or gear structure 3 assembly. There is no need to disassemble the entire oil level gauge or modify the mounting base module 1, which greatly simplifies the maintenance process and reduces the operational risks in the oil-filled state.

[0033] The central shaft 13 is rotatably mounted in the bearing 15 to ensure smooth rotation and improve rotational accuracy. A motion shaft seal 16 is provided near its outer end to provide strong support and prevent external impurities or oil from seeping inward along the axis. When the float assembly drives the central shaft 13 to rotate with the oil level, the rotation of the central shaft 13 is transmitted to the eccentric rotating shaft 18 through the universal joint assembly 17. The universal joint assembly 17 allows for stable power transmission under a certain angular deviation, accommodating minor misalignments during installation or operation. The eccentric rotating shaft 18 passes through the dial, and its end is connected to the pointer 11, which drives the pointer 11 to rotate on the dial to indicate the oil level. A transparent cover plate 112 is provided at one end of the outer casing 12 to facilitate observation of the position of the pointer 11, while also providing dust and water protection.

[0034] Example 2: Unlike Example 1, the eccentric rotating shaft 18 has travel limit blocks 19 on both sides of the eccentric wheel's rotation direction, with the travel limit blocks 19 fixedly connected to the inner wall of the outer casing 12. When the oil level reaches its limit, the eccentric wheel touches the travel limit block 19, preventing the pointer 11 from continuing to rotate. This design prevents damage to the transmission mechanism from overtravel, protects internal parts, ensures the pointer 11 accurately indicates within its range, and improves the safety and durability of the device.

[0035] The external shaft structure 2 consists of a central shaft mounting base 21, an external shaft 22, a connecting rod A23, and a float A24. The central shaft mounting base 21 is detachably connected to the mounting base module 1, and the external shaft 22 is rotatably mounted in the middle. One end of the external shaft 22 is connected to the mounting base module 1, and the other end is fixedly connected to the connecting rod A23. The end of the connecting rod A23 is fixedly connected to the float A24. The external shaft structure 2 is connected to the mounting base module 1, which drives the pointer 11 to rotate. The rotation range of the float A24 is from -60° to +60°, and the corresponding rotation range of the pointer 11 is from 0° to +120°. When the float assembly is an external shaft structure 2, changes in the oil level in the oil tank cause the float A24 floating on the oil surface to move up and down accordingly. Its movement is transmitted to the external shaft 22 through the connecting rod A23, and then connected to the mounting base module 1, thereby causing the pointer 11 to deflect and realizing oil monitoring. This structure simplifies the mechanical transmission chain, avoids the wear and jamming problems caused by traditional multi-stage transmission, and the modular design allows only the float assembly to be replaced during maintenance, significantly improving maintenance efficiency and reducing the risk of operating with oil.

[0036] The gear structure 3 includes a gear module mounting base 31, a connecting rod B32, and a float B33. The gear module mounting base 31 is connected to the mounting base module 1. A rotating shaft 34 is rotatably mounted on one side inside the gear module mounting base 31. A bevel gear A35 is located near the end of the rotating shaft 34. A bevel gear B36 is rotatably mounted vertically to the bevel gear A35. The bevel gear A35 meshes with the bevel gear B36, and the bevel gear B36 is connected to the mounting base module 1. One end of the connecting rod B32 is fixedly connected to the middle of the rotating shaft 34, and the other end is fixedly connected to the float B33. When the oil level changes, causing the float B33 to float up and down, the connecting rod B32 drives the rotating shaft 34 to swing. The rotating shaft 34 drives the bevel gear A35 to rotate. The meshing of the bevel gear A35 and the bevel gear B36 changes the direction of motion, realizing the vertical transmission of power. The bevel gear B36 is connected to the mounting base module 1, which ultimately drives the pointer 11 inside the mounting base module 1 to rotate, thus displaying the oil level detection result. The swing range of the float B33 is -45° to 0° or 0° to 45° in the vertical direction, and the corresponding rotation range of the pointer 11 is 0° to +120°. Through the bevel gear transmission structure, the lateral swing of the float is effectively converted into vertical rotation output. This structure is not only compact and highly adaptable, but also has stable and reliable transmission, expands the rotation angle range, and improves the indication accuracy.

[0037] Example 3: Unlike Example 2, the cover 42 has a notch corresponding to the display screen 43, and a transparent window 422 is installed at the notch. The transparent window 422 has a four-way fixing frame 45, which secures the transparent window 422 within the notch of the cover 42. The transparent window 422 is made of a single square glass pane, allowing observation of the internal display screen 43 through the notch while preventing dust from entering. The edge is a sealed edge designed for the installation of the transparent window 422, providing dust and water resistance. During use, the oil level data on the display screen 43 can be observed through the transparent window 422, and the control button 421 can be used to view historical data. This design improves the sealing of the electronic control module 4, enabling reliable operation of the equipment.

[0038] The base box 41 also includes a mounting base 46 and several mounting holes 47, with the mounting base 46 engaging with the mounting holes 47. The power module 44 is mounted on the innermost side of the mounting base 46, the controller and storage module are mounted in the middle, and the display screen 43 is embedded on the outermost side. The controller and data cable are detachably connected. The controller also has a data cable connector, which passes through the mounting base 46 and snaps into one of the mounting holes 47 in the base box 41. The data cable is detachably connected to the connector. The connector on the controller passes through the mounting base 46 and snaps into the mounting hole 47 in the base box 41 for positioning. The data cable can be plugged in and out of the connector at any time, enabling quick connection or disconnection from the controller. This modular installation structure ensures a reasonable and secure layout of the electronic components, improving internal space utilization and ease of assembly and maintenance.

[0039] The transparent cover 112 is made of transparent plastic or glass, facilitating observation of the pointer 11; the outer casing 12 is made of aluminum alloy, making it lightweight and corrosion-resistant. The transparent cover 112, made of transparent plastic or glass, facilitates observation of the pointer 11's position and provides good light transmission and protection; the outer casing 12, made of aluminum alloy, is lightweight, easy to install, and has excellent corrosion resistance, effectively protecting internal components and meeting the environmental requirements for long-term transformer operation.

[0040] Example 4: Unlike Example 3, the central shaft mounting base 21 is made of aluminum alloy, with bolts symmetrically arranged on both sides. The bolts pass through the central shaft mounting base 21 and the mounting base module 1, and nuts are threaded onto the bolts for a limiting connection. The central shaft mounting base 21 is placed on the mounting base module 1, and the bolts passing through both and tightening the nuts achieve a secure limiting connection between the float assembly and the base module. When the oil level changes, causing the float A24 to rise and fall, the movement is transmitted to the external shaft 22 via the connecting rod A23. The external shaft 22 is connected to the mounting base module 1, thereby driving the central shaft 13 and the pointer 11 to rotate, thus indicating the oil level. The hollow stainless steel connecting rod A23 ensures strength and corrosion resistance while reducing the weight of the transmission components. The aluminum alloy central shaft mounting base 21 reduces the overall weight. The bolts and nuts provide a stable and reliable connection, ensuring the reliability of the transmission. Furthermore, this detachable structure facilitates the overall replacement and maintenance of the float assembly, improving the interchangeability and practicality of the device.

[0041] The connecting rod A23 is a hollow stainless steel rod, with an installation sleeve 25 connected to its end. The installation sleeve 25 is fitted onto the end of the external shaft 22, and a screw 26 is also provided on the installation sleeve 25. The screw 26 passes through the installation sleeve 25 and connects to the external shaft 22. The float A24 is made of stainless steel and is a hollow sphere that can float on the insulating oil. When the oil level changes, the float A24 floats up and down with the oil level, driving the connecting rod A23 to move. The connecting rod A23 transmits force to the external shaft 22 through the installation sleeve 25 and the screw 26, driving the external shaft 22 to rotate. The hollow stainless steel connecting rod A23 ensures structural strength and corrosion resistance. The connection method of the installation sleeve 25 and the screw 26 is simple in structure, easy to assemble and disassemble, and has a firm connection, ensuring effective torque transmission. At the same time, the stainless steel hollow float A24 has good durability and buoyancy stability, which together ensure the sensitivity, accuracy, and long-term reliability of oil level monitoring. Moreover, this connection structure facilitates the quick assembly and replacement of the float assembly.

[0042] The connecting rod B32 is a hollow stainless steel rod; the float B33 is also made of stainless steel and is a hollow sphere that can float on the insulating oil. Both connecting rod B32 and float B33 utilize a hollow stainless steel structure, which, while ensuring corrosion resistance, sufficient strength, and buoyancy, effectively reduces the weight of the transmission components, lowers the moment of inertia, and improves the response sensitivity to oil level changes and transmission stability. The overall structure is reliable, which helps improve the accuracy of oil level monitoring and the durability of long-term operation.

[0043] Numerous specific details are set forth in this specification. However, it will be understood that embodiments of this invention may be practiced without these specific details. In some instances, well-known methods, structures, and techniques have not been shown in detail so as not to obscure the understanding of this specification.

[0044] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model, and they should all be covered within the scope of the claims and specification of this utility model.

Claims

1. An intelligent oil level gauge with interchangeability features, characterized by: The system includes a float assembly, a mounting base module (1) with a pointer (11), and an electrical control module (4). The float assembly includes an external shaft structure (2) and a gear structure (3). The mounting base module (1) also includes a housing (12) and a central shaft (13). The central shaft (13) is interchangeably connected to the external shaft structure (2) or the gear structure (3) of the float assembly, thereby driving the pointer (11) to rotate. The pointer (11) rotates from 0° to +120°, corresponding to the float assembly rotating from -60° to +60°. One end of the housing (12) is fitted with a transparent cover plate (112), and the other end is fitted with a flange connecting seat (14). A dial and a bearing (15) are also provided in the middle. The central shaft (13) is rotatably mounted in the bearing (15), and the shaft body of the central shaft (13) near the outer end is provided with a motion shaft seal (16). A universal joint assembly (17) is connected to the inner end of the device. The universal joint assembly (17) is connected to an eccentric rotating shaft (18), which passes through the dial and is connected to a pointer (11) at its end. A hollow angle sensor (110) is also connected to the eccentric rotating shaft (18), and the hollow angle sensor (110) is also electrically connected to a lead wire socket (111). The lead wire socket (111) is embedded in the surface of the outer casing (12). The electronic control module (4) includes a bottom box (41), and a cover (42) is embedded in the surface of the bottom box (41). Inside the bottom box (41) are a display screen (43), a controller, a storage module, and a power module (44) that are electrically connected together. A control button (421) that is electrically connected to the controller is embedded in the cover (42). The controller is also connected to a data cable that matches the lead wire socket (111).

2. The smart oil level gauge with interchangeability feature as claimed in claim 1 wherein: The eccentric rotating shaft (18) has stroke limit blocks (19) on both sides of the eccentric wheel rotation direction, wherein the stroke limit blocks (19) are fixedly connected to the inner wall of the outer shell (12).

3. The smart oil level gauge with interchangeability feature as claimed in claim 1 wherein: The cover (42) has a notch corresponding to the position of the display screen (43), and a transparent window (422) is installed at the notch; the transparent window (422) has a fixed frame (45) on all four sides, and the fixed frame (45) fixes the transparent window (422) in the notch of the cover (42).

4. The smart oil level gauge with interchangeability feature as claimed in claim 3 wherein: The bottom box (41) is also provided with a mounting base (46) and several mounting holes (47), wherein the mounting base (46) and the mounting holes (47) are connected in cooperation; the power module (44) is installed on the innermost side of the mounting base (46), the controller and storage module are installed in the middle, and the display screen (43) is embedded on the outermost side; the controller and the data cable are detachably connected, and the controller is also provided with a plug for connecting the data cable. After the plug passes through the mounting base (46), it is inserted into one of the mounting holes (47) of the bottom box (41), and the data cable is detachably connected to the plug.

5. The smart oil level gauge with interchangeability feature as claimed in claim 1 wherein: The external shaft structure (2) consists of a central shaft mounting base (21), an external shaft (22), a connecting rod A (23), and a float A (24). The central shaft mounting base (21) is detachably connected to the mounting base module (1), and the external shaft (22) is rotatably set in the middle. One end of the external shaft (22) is connected to the mounting base module (1), and the other end is fixedly connected to the connecting rod A (23). The end of the connecting rod A (23) is fixedly connected to the float A (24). The external shaft structure (2) is connected to the mounting base module (1) to drive the pointer (11) to rotate. The rotation range of the float A (24) is from -60° to +60°, and the corresponding rotation range of the pointer (11) is from 0° to +120°.

6. An intelligent oil level gauge with interchangeability feature as claimed in claim 5 wherein: The central shaft mounting base (21) is made of aluminum alloy and has bolts symmetrically arranged on both sides. The bolts pass through the central shaft mounting base (21) and the mounting base module (1), and the bolts are threaded with nuts, which limit the connection.

7. A smart oil level gauge with interchangeable characteristics as described in any one of claims 5 or 6, characterized in that: The connecting rod A (23) is a hollow stainless steel rod, and the end of the connecting rod A (23) is connected to the mounting sleeve (25); the mounting sleeve (25) is fitted into the end of the external shaft (22), and the mounting sleeve (25) is also provided with a screw (26), which passes through the mounting sleeve (25) and is connected to the external shaft (22); the float A (24) is made of stainless steel and is a hollow sphere that can float on the insulating oil.

8. An intelligent oil level gauge with interchangeability feature as claimed in any one of the claims 1 to 6 wherein: The gear structure (3) includes a gear module mounting base (31), a connecting rod B (32), and a float B (33). The gear module mounting base (31) is connected to the mounting base module (1). A rotating shaft (34) is rotatably provided on one side inside the gear module mounting base (31). A bevel gear A (35) is provided near the end of the rotating shaft (34). A bevel gear B (36) is rotatably provided vertically to the bevel gear A (35). The bevel gear A (35) meshes with the bevel gear B (36). The bevel gear B (36) is connected to the mounting base module (1). One end of the connecting rod B (32) is fixedly connected to the middle of the rotating shaft (34), and the other end is fixedly connected to the float B (33).

9. An intelligent oil level gauge with interchangeability feature as claimed in claim 8 wherein: The connecting rod B (32) is a hollow stainless steel rod; the float B (33) is made of stainless steel and is a hollow sphere that can float on insulating oil.

10. The smart oil level gauge with interchangeability feature as claimed in claim 1 wherein: The transparent cover (112) is made of transparent plastic or glass, which makes it easy to observe the pointer (11); the outer shell (12) is made of aluminum alloy, which is lightweight and has good corrosion resistance.

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