Oil level gauge with interchangeability

Abstract

This utility model discloses an interchangeable oil level gauge, including a float assembly and a mounting base module with a pointer. The float assembly includes an external shaft structure and a gear structure, both interchangeably connected to the mounting base module to drive the pointer to rotate. The pointer's swing angle is uniformly from 0° to 120°. The float of the external shaft structure swings horizontally within a range of 0° to 120°; the float of the gear structure swings vertically within two ranges: -45° to 0° and 0° to +45°. This utility model's float assembly uses interchangeable external shaft and gear structures, providing rotation ranges of -60° to +60°, -45° to 0°, or 0° to +45° respectively, expanding the indicating angle and reducing blind spots. The modular design facilitates replacement and maintenance, reduces costs, and improves adaptability and flexibility, solving the problems of traditional oil level gauges' limited functionality and poor accuracy stability, thus enhancing practicality.

Description

Technical Field

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

[0002] In power systems, oil-immersed power transformers are critical equipment, and their operational reliability is paramount. Accurate monitoring of the oil level in the transformer tank or conservator is a key aspect of ensuring safe operation. Currently, the commonly used traditional mechanical oil level gauges operate on the principle of buoyancy. Changes in the oil level in the conservator cause a float to rise and fall, which in turn drives the dial pointer to rotate via a float rod, mechanical transmission device, and magnetic coupler to indicate the oil level. However, this type of structure has inherent drawbacks. For example, the float and linkage mechanism, when immersed in oil for extended periods, are prone to aging, wear, jamming, or deformation, leading to inaccurate readings or even malfunctions. The drive shaft seal may leak oil after prolonged operation. Furthermore, the integrated structure makes it difficult to replace individual components, resulting in high maintenance costs and risks. In addition, the existing structure limits the rotation angle, may have blind spots, and is susceptible to mechanical clearances, friction, vibration, and temperature fluctuations, resulting in insufficient accuracy and stability. Therefore, developing an oil level gauge that overcomes these shortcomings has become an urgent technical need in this field. Utility Model Content

[0003] To address the shortcomings of existing integrated oil level gauge structures, such as difficulty in maintenance and potential blind spots, this invention provides a structure with interchangeability, allowing for flexible changes in the horizontal and vertical swing direction and angle of the float. This enables the oil level gauge to be flexibly installed in different locations on the transformer, facilitating overall maintenance. Furthermore, by increasing the rotation angle, the indication range can be improved, thereby reducing the use of blind spots.

[0004] To achieve the above objectives, the technical solution of this utility model is as follows:

[0005] An interchangeable oil level gauge includes a float assembly and a mounting base module with a pointer. The float assembly includes an external shaft structure and a gear structure, which are interchangeably connected to the mounting base module to drive the pointer to rotate within a range of 0° to +120°. 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, with the external shaft 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, when connected to the mounting base module, drives the pointer to rotate within a range of -60° to +60°.

[0006] 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 securely limit the connection between the float assembly and the base module. When the oil level changes, causing float A to rise or 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 rotation range of float A is -60° to +60°, corresponding to the pointer's indication range of 0° to 120°. 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.

[0007] 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.

[0008] 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 vertically 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, and 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. The 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 oscillation range of float B is -45° to 0° or 0° to 45° in the vertical direction, and the corresponding pointer rotation range is 0° to +120°. Through the bevel gear transmission structure, the lateral oscillation of the float is effectively converted into vertical rotation output. It is not only compact and highly adaptable, but also has stable and reliable transmission, expands the rotation angle range, and improves the indication accuracy.

[0009] 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.

[0010] Furthermore, the mounting base module also includes an outer shell and a central shaft, wherein the central shaft is connected to the external shaft structure or gear structure of the float assembly; a transparent cover is installed at one end of the outer shell, a flange connection seat is installed at the other end, and a dial and a bearing are provided in the middle; the central shaft is rotatably mounted in the bearing, and a motion shaft seal is provided on the shaft body near the outer end of the central shaft, and a universal joint assembly is connected on the side near the inner end; 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. The flange connection seat is fixedly installed on the transformer oil conservator or tank. The float assembly is connected to the mounting base module. During use, the central shaft is rotatably mounted in the bearing to ensure smooth rotation and improve rotational accuracy. A motion shaft seal is located near its outer end to provide strong support and prevent external impurities or oil from seeping in axially. When the float assembly drives the central shaft to rotate according to the oil level, the rotation of the central shaft is transmitted to the eccentric rotating shaft through 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, which rotates on the dial to indicate the oil level. A transparent cover is provided at one end of the outer casing for easy observation of the pointer position, while also providing dust and water protection. This improvement enhances the stability and sealing of the central shaft rotation through bearing support and a motion shaft seal. The universal joint assembly enhances the adaptability and reliability of the transmission. The eccentric inter-rotation shaft design helps optimize the internal space layout and achieve precise transmission. The overall structure integrates sensing, transmission, and display within a sealed outer casing, not only improving the device's protection level, operational accuracy, and service life, but also facilitating quick docking and replacement with different float assemblies through standardized flange connections and modular design, significantly enhancing maintenance convenience and system interchangeability. The eccentric inter-rotation shaft can transmit both rotation and revolution, facilitating adjustment of the center distance between the shafts.

[0011] 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.

[0012] Furthermore, a hollow angle sensor is 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 housing. The lead wire socket can connect to a data cable. When the eccentric rotating shaft rotates, the hollow angle sensor detects its rotation angle in real time and converts the oil level change into an electrical signal, which is output through the lead wire socket and the data cable. This design retains the local display of the mechanical pointer while adding an electronic signal output function, facilitating integration into an automated monitoring system and improving the intelligence level and application flexibility of the oil level gauge. The hollow angle sensor can convert the angle of movement of the pointer into a digital structure for easy observation.

[0013] 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.

[0014] How to use:

[0015] The pointer indicates the oil level. In use, first, based on the installation space of the transformer oil conservator, the required indicating range, and maintenance convenience requirements, select a suitable external shaft structure or gear structure for the float assembly. Connect the selected external shaft structure or gear structure to the mounting base module, ensuring the mounting base module is securely installed on the reserved interface of the transformer tank or oil conservator, and that the float assembly is in contact with the oil. If the float assembly uses an external shaft structure, changes in the oil level in the conservator will cause the float A floating on the oil surface to move up and down. This movement is transmitted to the external shaft via connecting rod A, and then connected to the mounting base module, causing the pointer to deflect, thus monitoring the oil level. It is important to note that when using an external shaft structure... With the shaft structure, float A rotates from -60° to +60° horizontally, corresponding to a pointer rotation range of 0° to +120°. If the float assembly used is a gear structure, it connects to the mounting base module via the gear structure, causing the pointer to deflect and thus monitoring the oil level. Note that with the gear structure, the pointer rotation range is 0° to +120°. When maintenance, replacement, or changes in application requirements necessitate replacing different types of float assemblies, simply remove the original float assembly from the mounting base module and install the new external shaft or gear structure float assembly. There is no need to disassemble the entire oil level gauge or modify the mounting base module, making the operation simple and quick.

[0016] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0017] 1. This utility model's float assembly includes two forms: an external shaft structure and a gear structure. Both structures are interchangeable and can be used with the mounting base module. The pointer's swing range is from 0° to +120°. The external shaft structure consists of a central shaft mounting base, an external shaft, a connecting rod, and a float. It also features a detachable design and works with the mounting base module. Its float A has a rotation range of -60° to +60°. The two structures can be interchanged depending on the application scenario. This not only increases the oil level gauge's indication range and reduces blind spots, but also facilitates maintenance and replacement, reducing maintenance costs and risks. Furthermore, it improves the adaptability and flexibility of the oil level gauge, solving the problems of traditional oil level gauges' limited functionality, insufficient accuracy, and instability, effectively enhancing the equipment's practicality.

[0018] 2. 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, enhancing 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.

[0019] 3. 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 component enhances transmission adaptability, the eccentric rotating shaft achieves precise transmission and adjustable center distance, and the stroke 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 components, making maintenance convenient and highly interchangeable, significantly improving the reliability, accuracy, and practicality of the oil level gauge. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0021] Figure 2 This is a schematic diagram of the internal structure of the mounting mold base of this utility model.

[0022] 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.

[0023] Attached image labels:

[0024] 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. Detailed Implementation

[0025] The present invention will be further described below with reference to the accompanying drawings.

[0026] Example 1: An interchangeable oil level gauge includes a float assembly and a mounting base module 1 with a pointer 11. The float assembly includes an external shaft structure 2 and a gear structure 3, which are interchangeably connected to the mounting base module 1 to drive the pointer 11 to rotate. The rotation range of the pointer 11 is uniformly between 0° and +120°. 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 to drive the pointer 11 to rotate, and the rotation range of the float A24 is between -60° and +60°.

[0027] The pointer 11 indicates the oil level. In use, first, based on the installation space of the transformer oil conservator, the required indicating range, and maintenance convenience requirements, select a suitable external shaft structure 2 or gear structure 3 for the float assembly. Connect the selected external shaft structure 2 or gear structure 3 to the mounting base module 1, where the mounting base module 1 is securely installed on the reserved interface of the transformer tank or oil conservator, ensuring the float assembly is in contact with the oil. If the float assembly uses an external shaft structure 2, changes in the oil level in the oil conservator cause the float A24 floating on the oil surface to move up and down. This movement is transmitted to the external shaft 22 via connecting rod A23, and then connected to the mounting base module 1, thereby causing the pointer 11 to deflect, thus monitoring the oil level. It should be noted that... With the shaft structure 2, the float A24 rotates from -60° to +60° in the horizontal direction, and the corresponding pointer 11 rotates from 0° to +120°. If the float assembly used is a gear structure 3, it is connected to the mounting base module 1 through the gear structure 3, which drives the pointer 11 to deflect, thereby monitoring the oil level. It should be noted that with the gear structure 3, the pointer 11 rotates from 0° to +120°. When maintenance, replacement, or replacement of different types of float assemblies is required due to changes in application requirements, simply remove the original float assembly from the mounting base module 1 and then install the new external shaft structure 2 or gear structure 3 float assembly. There is no need to disassemble the entire oil level gauge or modify the mounting base module 1, making the operation simple and quick.

[0028] Example 2: The difference from Example 1 is that 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. The central shaft mounting base 21 is placed on the mounting base module 1. Bolts pass through both and nuts are tightened to achieve a secure connection between the float assembly and the base module. When the oil level changes, causing the float A24 to rise or 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, which in turn drives the central shaft 13 and the pointer 11 to rotate, thus indicating the oil level. The float A24 rotates within a range of -60° to +60°, and the pointer 11 indicates within a range of 0° to 120°. 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 bolt and nut combination provides 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.

[0029] 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 and bevel gear B36 mesh, 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, ultimately driving the pointer 11 inside the mounting base module 1 to rotate, thus displaying the oil level detection result. The oscillation range of float B33 is -45° to 0° or 0° to 45° in the vertical direction, and the corresponding rotation range of pointer 11 is 0° to +120°. Through the bevel gear transmission structure, the lateral oscillation of the float is effectively converted into vertical rotation output. It is not only compact and highly adaptable, but also has stable and reliable transmission, expands the rotation angle range, and improves the indication accuracy.

[0030] Example 3: The difference from Example 2 is that the connecting rod A23 is a hollow stainless steel rod, and the end of the connecting rod A23 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 A24 is made of stainless steel and is a hollow spherical body that can float on insulating oil. When the oil level changes, the float A24 floats up and down with the oil surface, driving the connecting rod A23 to move. The connecting rod A23 transmits force to the external shaft 22 through the mounting 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 mounting sleeve 25 and the screw 26 is simple in structure, easy to install 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.

[0031] 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.

[0032] Example 4: Unlike Example 2, the mounting base module 1 further includes an outer shell 12 and a central shaft 13, wherein the central shaft 13 is connected to the external shaft structure 2 or gear structure 3 of the float assembly; one end of the outer shell 12 is equipped with a transparent cover plate 112, and the other end is equipped with a flange connecting seat 14, and a dial and bearing 15 are 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, and the side near the inner end is connected to a universal joint assembly 17; 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. The flange connection seat 14 is fixedly installed on the transformer oil tank or housing. The float assembly is connected to the mounting base module 1. In use, the central shaft 13 is rotatably installed 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 in axially. When the float assembly drives the central shaft 13 to rotate with the oil level change, 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 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 position. Oil level; a transparent cover 112 is provided at one end of the outer casing 12 for easy observation of the pointer 11 position, while also providing dust and water protection; this improvement enhances the stability and sealing of the central shaft 13 rotation through the support of the bearing 15 and the setting of the motion shaft seal 16, the universal joint assembly 17 enhances the adaptability and reliability of the transmission, and the eccentric inter-rotation shaft 18 design helps optimize the internal space layout and achieve precise transmission. The overall structure integrates sensing, transmission and display within the sealed outer casing 12, which not only improves the protection level, operating accuracy and service life of the device, but also the standardized flange connection seat 14 and modular design facilitate quick docking and replacement with different float assemblies, significantly enhancing the convenience of maintenance and the interchangeability of the system. Among them, the eccentric inter-rotation shaft 18 can transmit not only rotation but also revolution, facilitating the adjustment of the center distance between the shafts.

[0033] The central shaft mounting base 21 is connected to the mounting base mold 1 by bolts and nuts. The connecting end of the external shaft 22 is provided with a connecting groove, which is connected to the central shaft 13.

[0034] Bolts are symmetrically arranged on both sides of the gear module mounting base 31; 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; at the same time, the bevel gear B36 of the gear structure 3 is inserted into the central shaft 13 to complete the connection between the two.

[0035] Example 5: Unlike Example 4, the eccentric rotating shaft 18 has travel limit blocks 19 on both sides of the eccentric wheel's rotation direction. These travel limit blocks 19 are fixedly connected to the inner wall of the outer casing 12. When the oil level reaches its limit, the eccentric wheel contacts 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.

[0036] A hollow angle sensor 110 is also connected to the eccentric rotating shaft 18. The hollow angle sensor 110 is electrically connected to a lead wire socket 111, which is embedded in the surface of the housing 12. The lead wire socket 111 can connect to a data cable. When the eccentric rotating shaft 18 rotates, the hollow angle sensor 110 detects its rotation angle in real time and converts the oil level change into an electrical signal, which is output through the lead wire socket 111 and the data cable. This design retains the local display of the mechanical pointer 11 while adding an electronic signal output function, which facilitates access to an automated monitoring system and improves the intelligence level and application flexibility of the oil level gauge. The hollow angle sensor 110 can convert the angle of movement on the pointer 11 into a digital structure for easy observation.

[0037] 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.

[0038] 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.

[0039] 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 interchangeable oil level gauge, characterized in that: The system includes a float assembly and a mounting base module (1) with a pointer (11). The float assembly includes an external shaft structure (2) and a gear structure (3). The external shaft structure (2) and the gear structure (3) are interchangeably connected to the mounting base module (1) to drive the pointer (11) to rotate. The pointer rotation range is uniformly between 0° and +120°. The external shaft structure (2) is composed of a central shaft mounting seat (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 an 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, and the float A (24) rotates within the range of -60° to +60°.

2. The oil level gauge with interchangeable characteristics as described in claim 1, characterized in that: 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.

3. The oil level gauge with interchangeable characteristics as described in claim 2, 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.

4. An interchangeable oil level gauge as described in any one of claims 2 or 3, characterized in that: 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).

5. An interchangeable oil level gauge as described in claim 4, characterized in that: 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.

6. An interchangeable oil level gauge as described in claim 1, characterized in that: The mounting base module (1) also includes an outer shell (12) and a central shaft (13), wherein the central shaft (13) is connected to the external shaft structure (2) or gear structure (3) of the float assembly; one end of the outer shell (12) is equipped with a transparent cover plate (112), the other end is equipped with a flange connection seat (14), and a dial and a bearing (15) are provided in the middle; the central shaft (13) is rotatably installed 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), and a universal joint assembly (17) is provided on the side near the inner end; the universal joint assembly (17) is connected to an eccentric rotating shaft (18), the eccentric rotating shaft (18) passes through the dial, and a pointer (11) is connected at the end.

7. An interchangeable oil level gauge as described in claim 6, characterized in that: 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).

8. An interchangeable oil level gauge as described in claim 6, characterized in that: A hollow angle sensor (110) is also connected to the eccentric rotating shaft (18), wherein the hollow angle sensor (110) is also electrically connected to a lead wire socket (111), and the lead wire socket (111) is embedded in the surface of the outer shell (12).

9. An interchangeable oil level gauge as described in claim 6, characterized in that: 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.

Images